/* * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2012, 2025 SAP SE. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "asm/macroAssembler.inline.hpp" #include "code/debugInfoRec.hpp" #include "code/compiledIC.hpp" #include "code/vtableStubs.hpp" #include "frame_ppc.hpp" #include "compiler/oopMap.hpp" #include "gc/shared/gcLocker.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/interp_masm.hpp" #include "memory/resourceArea.hpp" #include "oops/klass.inline.hpp" #include "prims/methodHandles.hpp" #include "runtime/continuation.hpp" #include "runtime/continuationEntry.inline.hpp" #include "runtime/jniHandles.hpp" #include "runtime/os.inline.hpp" #include "runtime/safepointMechanism.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/signature.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/timerTrace.hpp" #include "runtime/vframeArray.hpp" #include "utilities/align.hpp" #include "utilities/macros.hpp" #include "vmreg_ppc.inline.hpp" #ifdef COMPILER1 #include "c1/c1_Runtime1.hpp" #endif #ifdef COMPILER2 #include "opto/ad.hpp" #include "opto/runtime.hpp" #endif #include #define __ masm-> #ifdef PRODUCT #define BLOCK_COMMENT(str) // nothing #else #define BLOCK_COMMENT(str) __ block_comment(str) #endif #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") class RegisterSaver { // Used for saving volatile registers. public: // Support different return pc locations. enum ReturnPCLocation { return_pc_is_lr, return_pc_is_pre_saved, return_pc_is_thread_saved_exception_pc }; static OopMap* push_frame_reg_args_and_save_live_registers(MacroAssembler* masm, int* out_frame_size_in_bytes, bool generate_oop_map, int return_pc_adjustment, ReturnPCLocation return_pc_location, bool save_vectors = false); static void restore_live_registers_and_pop_frame(MacroAssembler* masm, int frame_size_in_bytes, bool restore_ctr, bool save_vectors = false); static void push_frame_and_save_argument_registers(MacroAssembler* masm, Register r_temp, int frame_size, int total_args, const VMRegPair *regs, const VMRegPair *regs2 = nullptr); static void restore_argument_registers_and_pop_frame(MacroAssembler*masm, int frame_size, int total_args, const VMRegPair *regs, const VMRegPair *regs2 = nullptr); // During deoptimization only the result registers need to be restored // all the other values have already been extracted. static void restore_result_registers(MacroAssembler* masm, int frame_size_in_bytes); // Constants and data structures: typedef enum { int_reg, float_reg, special_reg, vec_reg } RegisterType; typedef enum { reg_size = 8, half_reg_size = reg_size / 2, vec_reg_size = 16 } RegisterConstants; typedef struct { RegisterType reg_type; int reg_num; VMReg vmreg; } LiveRegType; }; #define RegisterSaver_LiveIntReg(regname) \ { RegisterSaver::int_reg, regname->encoding(), regname->as_VMReg() } #define RegisterSaver_LiveFloatReg(regname) \ { RegisterSaver::float_reg, regname->encoding(), regname->as_VMReg() } #define RegisterSaver_LiveSpecialReg(regname) \ { RegisterSaver::special_reg, regname->encoding(), regname->as_VMReg() } #define RegisterSaver_LiveVecReg(regname) \ { RegisterSaver::vec_reg, regname->encoding(), regname->as_VMReg() } static const RegisterSaver::LiveRegType RegisterSaver_LiveRegs[] = { // Live registers which get spilled to the stack. Register // positions in this array correspond directly to the stack layout. // // live special registers: // RegisterSaver_LiveSpecialReg(SR_CTR), // // live float registers: // RegisterSaver_LiveFloatReg( F0 ), RegisterSaver_LiveFloatReg( F1 ), RegisterSaver_LiveFloatReg( F2 ), RegisterSaver_LiveFloatReg( F3 ), RegisterSaver_LiveFloatReg( F4 ), RegisterSaver_LiveFloatReg( F5 ), RegisterSaver_LiveFloatReg( F6 ), RegisterSaver_LiveFloatReg( F7 ), RegisterSaver_LiveFloatReg( F8 ), RegisterSaver_LiveFloatReg( F9 ), RegisterSaver_LiveFloatReg( F10 ), RegisterSaver_LiveFloatReg( F11 ), RegisterSaver_LiveFloatReg( F12 ), RegisterSaver_LiveFloatReg( F13 ), RegisterSaver_LiveFloatReg( F14 ), RegisterSaver_LiveFloatReg( F15 ), RegisterSaver_LiveFloatReg( F16 ), RegisterSaver_LiveFloatReg( F17 ), RegisterSaver_LiveFloatReg( F18 ), RegisterSaver_LiveFloatReg( F19 ), RegisterSaver_LiveFloatReg( F20 ), RegisterSaver_LiveFloatReg( F21 ), RegisterSaver_LiveFloatReg( F22 ), RegisterSaver_LiveFloatReg( F23 ), RegisterSaver_LiveFloatReg( F24 ), RegisterSaver_LiveFloatReg( F25 ), RegisterSaver_LiveFloatReg( F26 ), RegisterSaver_LiveFloatReg( F27 ), RegisterSaver_LiveFloatReg( F28 ), RegisterSaver_LiveFloatReg( F29 ), RegisterSaver_LiveFloatReg( F30 ), RegisterSaver_LiveFloatReg( F31 ), // // live integer registers: // RegisterSaver_LiveIntReg( R0 ), //RegisterSaver_LiveIntReg( R1 ), // stack pointer RegisterSaver_LiveIntReg( R2 ), RegisterSaver_LiveIntReg( R3 ), RegisterSaver_LiveIntReg( R4 ), RegisterSaver_LiveIntReg( R5 ), RegisterSaver_LiveIntReg( R6 ), RegisterSaver_LiveIntReg( R7 ), RegisterSaver_LiveIntReg( R8 ), RegisterSaver_LiveIntReg( R9 ), RegisterSaver_LiveIntReg( R10 ), RegisterSaver_LiveIntReg( R11 ), RegisterSaver_LiveIntReg( R12 ), //RegisterSaver_LiveIntReg( R13 ), // system thread id RegisterSaver_LiveIntReg( R14 ), RegisterSaver_LiveIntReg( R15 ), RegisterSaver_LiveIntReg( R16 ), RegisterSaver_LiveIntReg( R17 ), RegisterSaver_LiveIntReg( R18 ), RegisterSaver_LiveIntReg( R19 ), RegisterSaver_LiveIntReg( R20 ), RegisterSaver_LiveIntReg( R21 ), RegisterSaver_LiveIntReg( R22 ), RegisterSaver_LiveIntReg( R23 ), RegisterSaver_LiveIntReg( R24 ), RegisterSaver_LiveIntReg( R25 ), RegisterSaver_LiveIntReg( R26 ), RegisterSaver_LiveIntReg( R27 ), RegisterSaver_LiveIntReg( R28 ), RegisterSaver_LiveIntReg( R29 ), RegisterSaver_LiveIntReg( R30 ), RegisterSaver_LiveIntReg( R31 ) // must be the last register (see save/restore functions below) }; static const RegisterSaver::LiveRegType RegisterSaver_LiveVecRegs[] = { // // live vector registers (optional, only these ones are used by C2): // RegisterSaver_LiveVecReg( VR0 ), RegisterSaver_LiveVecReg( VR1 ), RegisterSaver_LiveVecReg( VR2 ), RegisterSaver_LiveVecReg( VR3 ), RegisterSaver_LiveVecReg( VR4 ), RegisterSaver_LiveVecReg( VR5 ), RegisterSaver_LiveVecReg( VR6 ), RegisterSaver_LiveVecReg( VR7 ), RegisterSaver_LiveVecReg( VR8 ), RegisterSaver_LiveVecReg( VR9 ), RegisterSaver_LiveVecReg( VR10 ), RegisterSaver_LiveVecReg( VR11 ), RegisterSaver_LiveVecReg( VR12 ), RegisterSaver_LiveVecReg( VR13 ), RegisterSaver_LiveVecReg( VR14 ), RegisterSaver_LiveVecReg( VR15 ), RegisterSaver_LiveVecReg( VR16 ), RegisterSaver_LiveVecReg( VR17 ), RegisterSaver_LiveVecReg( VR18 ), RegisterSaver_LiveVecReg( VR19 ), RegisterSaver_LiveVecReg( VR20 ), RegisterSaver_LiveVecReg( VR21 ), RegisterSaver_LiveVecReg( VR22 ), RegisterSaver_LiveVecReg( VR23 ), RegisterSaver_LiveVecReg( VR24 ), RegisterSaver_LiveVecReg( VR25 ), RegisterSaver_LiveVecReg( VR26 ), RegisterSaver_LiveVecReg( VR27 ), RegisterSaver_LiveVecReg( VR28 ), RegisterSaver_LiveVecReg( VR29 ), RegisterSaver_LiveVecReg( VR30 ), RegisterSaver_LiveVecReg( VR31 ) }; OopMap* RegisterSaver::push_frame_reg_args_and_save_live_registers(MacroAssembler* masm, int* out_frame_size_in_bytes, bool generate_oop_map, int return_pc_adjustment, ReturnPCLocation return_pc_location, bool save_vectors) { // Push an abi_reg_args-frame and store all registers which may be live. // If requested, create an OopMap: Record volatile registers as // callee-save values in an OopMap so their save locations will be // propagated to the RegisterMap of the caller frame during // StackFrameStream construction (needed for deoptimization; see // compiledVFrame::create_stack_value). // If return_pc_adjustment != 0 adjust the return pc by return_pc_adjustment. // Updated return pc is returned in R31 (if not return_pc_is_pre_saved). // calculate frame size const int regstosave_num = sizeof(RegisterSaver_LiveRegs) / sizeof(RegisterSaver::LiveRegType); const int vecregstosave_num = save_vectors ? (sizeof(RegisterSaver_LiveVecRegs) / sizeof(RegisterSaver::LiveRegType)) : 0; const int register_save_size = regstosave_num * reg_size + vecregstosave_num * vec_reg_size; const int frame_size_in_bytes = align_up(register_save_size, frame::alignment_in_bytes) + frame::native_abi_reg_args_size; *out_frame_size_in_bytes = frame_size_in_bytes; const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); const int register_save_offset = frame_size_in_bytes - register_save_size; // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words. OopMap* map = generate_oop_map ? new OopMap(frame_size_in_slots, 0) : nullptr; BLOCK_COMMENT("push_frame_reg_args_and_save_live_registers {"); // push a new frame __ push_frame(frame_size_in_bytes, noreg); // Save some registers in the last (non-vector) slots of the new frame so we // can use them as scratch regs or to determine the return pc. __ std(R31, frame_size_in_bytes - reg_size - vecregstosave_num * vec_reg_size, R1_SP); __ std(R30, frame_size_in_bytes - 2*reg_size - vecregstosave_num * vec_reg_size, R1_SP); // save the flags // Do the save_LR by hand and adjust the return pc if requested. switch (return_pc_location) { case return_pc_is_lr: __ mflr(R31); break; case return_pc_is_pre_saved: assert(return_pc_adjustment == 0, "unsupported"); break; case return_pc_is_thread_saved_exception_pc: __ ld(R31, thread_(saved_exception_pc)); break; default: ShouldNotReachHere(); } if (return_pc_location != return_pc_is_pre_saved) { if (return_pc_adjustment != 0) { __ addi(R31, R31, return_pc_adjustment); } __ std(R31, frame_size_in_bytes + _abi0(lr), R1_SP); } // save all registers (ints and floats) int offset = register_save_offset; for (int i = 0; i < regstosave_num; i++) { int reg_num = RegisterSaver_LiveRegs[i].reg_num; int reg_type = RegisterSaver_LiveRegs[i].reg_type; switch (reg_type) { case RegisterSaver::int_reg: { if (reg_num < 30) { // We spilled R30-31 right at the beginning. __ std(as_Register(reg_num), offset, R1_SP); } break; } case RegisterSaver::float_reg: { __ stfd(as_FloatRegister(reg_num), offset, R1_SP); break; } case RegisterSaver::special_reg: { if (reg_num == SR_CTR.encoding()) { __ mfctr(R30); __ std(R30, offset, R1_SP); } else { Unimplemented(); } break; } default: ShouldNotReachHere(); } if (generate_oop_map) { map->set_callee_saved(VMRegImpl::stack2reg(offset >> 2), RegisterSaver_LiveRegs[i].vmreg); } offset += reg_size; } // Note that generate_oop_map in the following loop is only used for the // polling_page_vectors_safepoint_handler_blob. // The order in which the vector contents are stored depends on Endianess and // the utilized instructions (PowerArchitecturePPC64). assert(is_aligned(offset, StackAlignmentInBytes), "should be"); if (PowerArchitecturePPC64 >= 10) { assert(is_even(vecregstosave_num), "expectation"); for (int i = 0; i < vecregstosave_num; i += 2) { int reg_num = RegisterSaver_LiveVecRegs[i].reg_num; assert(RegisterSaver_LiveVecRegs[i + 1].reg_num == reg_num + 1, "or use other instructions!"); __ stxvp(as_VectorRegister(reg_num).to_vsr(), offset, R1_SP); // Note: The contents were read in the same order (see loadV16_Power9 node in ppc.ad). if (generate_oop_map) { map->set_callee_saved(VMRegImpl::stack2reg(offset >> 2), RegisterSaver_LiveVecRegs[i LITTLE_ENDIAN_ONLY(+1) ].vmreg); map->set_callee_saved(VMRegImpl::stack2reg((offset + vec_reg_size) >> 2), RegisterSaver_LiveVecRegs[i BIG_ENDIAN_ONLY(+1) ].vmreg); } offset += (2 * vec_reg_size); } } else { for (int i = 0; i < vecregstosave_num; i++) { int reg_num = RegisterSaver_LiveVecRegs[i].reg_num; if (PowerArchitecturePPC64 >= 9) { __ stxv(as_VectorRegister(reg_num)->to_vsr(), offset, R1_SP); } else { __ li(R31, offset); __ stxvd2x(as_VectorRegister(reg_num)->to_vsr(), R31, R1_SP); } // Note: The contents were read in the same order (see loadV16_Power8 / loadV16_Power9 node in ppc.ad). if (generate_oop_map) { VMReg vsr = RegisterSaver_LiveVecRegs[i].vmreg; map->set_callee_saved(VMRegImpl::stack2reg(offset >> 2), vsr); } offset += vec_reg_size; } } assert(offset == frame_size_in_bytes, "consistency check"); BLOCK_COMMENT("} push_frame_reg_args_and_save_live_registers"); // And we're done. return map; } // Pop the current frame and restore all the registers that we // saved. void RegisterSaver::restore_live_registers_and_pop_frame(MacroAssembler* masm, int frame_size_in_bytes, bool restore_ctr, bool save_vectors) { const int regstosave_num = sizeof(RegisterSaver_LiveRegs) / sizeof(RegisterSaver::LiveRegType); const int vecregstosave_num = save_vectors ? (sizeof(RegisterSaver_LiveVecRegs) / sizeof(RegisterSaver::LiveRegType)) : 0; const int register_save_size = regstosave_num * reg_size + vecregstosave_num * vec_reg_size; const int register_save_offset = frame_size_in_bytes - register_save_size; BLOCK_COMMENT("restore_live_registers_and_pop_frame {"); // restore all registers (ints and floats) int offset = register_save_offset; for (int i = 0; i < regstosave_num; i++) { int reg_num = RegisterSaver_LiveRegs[i].reg_num; int reg_type = RegisterSaver_LiveRegs[i].reg_type; switch (reg_type) { case RegisterSaver::int_reg: { if (reg_num != 31) // R31 restored at the end, it's the tmp reg! __ ld(as_Register(reg_num), offset, R1_SP); break; } case RegisterSaver::float_reg: { __ lfd(as_FloatRegister(reg_num), offset, R1_SP); break; } case RegisterSaver::special_reg: { if (reg_num == SR_CTR.encoding()) { if (restore_ctr) { // Nothing to do here if ctr already contains the next address. __ ld(R31, offset, R1_SP); __ mtctr(R31); } } else { Unimplemented(); } break; } default: ShouldNotReachHere(); } offset += reg_size; } assert(is_aligned(offset, StackAlignmentInBytes), "should be"); if (PowerArchitecturePPC64 >= 10) { for (int i = 0; i < vecregstosave_num; i += 2) { int reg_num = RegisterSaver_LiveVecRegs[i].reg_num; assert(RegisterSaver_LiveVecRegs[i + 1].reg_num == reg_num + 1, "or use other instructions!"); __ lxvp(as_VectorRegister(reg_num).to_vsr(), offset, R1_SP); offset += (2 * vec_reg_size); } } else { for (int i = 0; i < vecregstosave_num; i++) { int reg_num = RegisterSaver_LiveVecRegs[i].reg_num; if (PowerArchitecturePPC64 >= 9) { __ lxv(as_VectorRegister(reg_num).to_vsr(), offset, R1_SP); } else { __ li(R31, offset); __ lxvd2x(as_VectorRegister(reg_num).to_vsr(), R31, R1_SP); } offset += vec_reg_size; } } assert(offset == frame_size_in_bytes, "consistency check"); // restore link and the flags __ ld(R31, frame_size_in_bytes + _abi0(lr), R1_SP); __ mtlr(R31); // restore scratch register's value __ ld(R31, frame_size_in_bytes - reg_size - vecregstosave_num * vec_reg_size, R1_SP); // pop the frame __ addi(R1_SP, R1_SP, frame_size_in_bytes); BLOCK_COMMENT("} restore_live_registers_and_pop_frame"); } void RegisterSaver::push_frame_and_save_argument_registers(MacroAssembler* masm, Register r_temp, int frame_size,int total_args, const VMRegPair *regs, const VMRegPair *regs2) { __ push_frame(frame_size, r_temp); int st_off = frame_size - wordSize; for (int i = 0; i < total_args; i++) { VMReg r_1 = regs[i].first(); VMReg r_2 = regs[i].second(); if (!r_1->is_valid()) { assert(!r_2->is_valid(), ""); continue; } if (r_1->is_Register()) { Register r = r_1->as_Register(); __ std(r, st_off, R1_SP); st_off -= wordSize; } else if (r_1->is_FloatRegister()) { FloatRegister f = r_1->as_FloatRegister(); __ stfd(f, st_off, R1_SP); st_off -= wordSize; } } if (regs2 != nullptr) { for (int i = 0; i < total_args; i++) { VMReg r_1 = regs2[i].first(); VMReg r_2 = regs2[i].second(); if (!r_1->is_valid()) { assert(!r_2->is_valid(), ""); continue; } if (r_1->is_Register()) { Register r = r_1->as_Register(); __ std(r, st_off, R1_SP); st_off -= wordSize; } else if (r_1->is_FloatRegister()) { FloatRegister f = r_1->as_FloatRegister(); __ stfd(f, st_off, R1_SP); st_off -= wordSize; } } } } void RegisterSaver::restore_argument_registers_and_pop_frame(MacroAssembler*masm, int frame_size, int total_args, const VMRegPair *regs, const VMRegPair *regs2) { int st_off = frame_size - wordSize; for (int i = 0; i < total_args; i++) { VMReg r_1 = regs[i].first(); VMReg r_2 = regs[i].second(); if (r_1->is_Register()) { Register r = r_1->as_Register(); __ ld(r, st_off, R1_SP); st_off -= wordSize; } else if (r_1->is_FloatRegister()) { FloatRegister f = r_1->as_FloatRegister(); __ lfd(f, st_off, R1_SP); st_off -= wordSize; } } if (regs2 != nullptr) for (int i = 0; i < total_args; i++) { VMReg r_1 = regs2[i].first(); VMReg r_2 = regs2[i].second(); if (r_1->is_Register()) { Register r = r_1->as_Register(); __ ld(r, st_off, R1_SP); st_off -= wordSize; } else if (r_1->is_FloatRegister()) { FloatRegister f = r_1->as_FloatRegister(); __ lfd(f, st_off, R1_SP); st_off -= wordSize; } } __ pop_frame(); } // Restore the registers that might be holding a result. void RegisterSaver::restore_result_registers(MacroAssembler* masm, int frame_size_in_bytes) { const int regstosave_num = sizeof(RegisterSaver_LiveRegs) / sizeof(RegisterSaver::LiveRegType); const int register_save_size = regstosave_num * reg_size; // VS registers not relevant here. const int register_save_offset = frame_size_in_bytes - register_save_size; // restore all result registers (ints and floats) int offset = register_save_offset; for (int i = 0; i < regstosave_num; i++) { int reg_num = RegisterSaver_LiveRegs[i].reg_num; int reg_type = RegisterSaver_LiveRegs[i].reg_type; switch (reg_type) { case RegisterSaver::int_reg: { if (as_Register(reg_num)==R3_RET) // int result_reg __ ld(as_Register(reg_num), offset, R1_SP); break; } case RegisterSaver::float_reg: { if (as_FloatRegister(reg_num)==F1_RET) // float result_reg __ lfd(as_FloatRegister(reg_num), offset, R1_SP); break; } case RegisterSaver::special_reg: { // Special registers don't hold a result. break; } default: ShouldNotReachHere(); } offset += reg_size; } assert(offset == frame_size_in_bytes, "consistency check"); } // Is vector's size (in bytes) bigger than a size saved by default? bool SharedRuntime::is_wide_vector(int size) { // Note, MaxVectorSize == 8/16 on PPC64. assert(size <= (SuperwordUseVSX ? 16 : 8), "%d bytes vectors are not supported", size); return size > 8; } static int reg2slot(VMReg r) { return r->reg2stack() + SharedRuntime::out_preserve_stack_slots(); } static int reg2offset(VMReg r) { return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; } // --------------------------------------------------------------------------- // Read the array of BasicTypes from a signature, and compute where the // arguments should go. Values in the VMRegPair regs array refer to 4-byte // quantities. Values less than VMRegImpl::stack0 are registers, those above // refer to 4-byte stack slots. All stack slots are based off of the stack pointer // as framesizes are fixed. // VMRegImpl::stack0 refers to the first slot 0(sp). // and VMRegImpl::stack0+1 refers to the memory word 4-bytes higher. Register // up to Register::number_of_registers) are the 64-bit // integer registers. // Note: the INPUTS in sig_bt are in units of Java argument words, which are // either 32-bit or 64-bit depending on the build. The OUTPUTS are in 32-bit // units regardless of build. Of course for i486 there is no 64 bit build // The Java calling convention is a "shifted" version of the C ABI. // By skipping the first C ABI register we can call non-static jni methods // with small numbers of arguments without having to shuffle the arguments // at all. Since we control the java ABI we ought to at least get some // advantage out of it. const VMReg java_iarg_reg[8] = { R3->as_VMReg(), R4->as_VMReg(), R5->as_VMReg(), R6->as_VMReg(), R7->as_VMReg(), R8->as_VMReg(), R9->as_VMReg(), R10->as_VMReg() }; const VMReg java_farg_reg[13] = { F1->as_VMReg(), F2->as_VMReg(), F3->as_VMReg(), F4->as_VMReg(), F5->as_VMReg(), F6->as_VMReg(), F7->as_VMReg(), F8->as_VMReg(), F9->as_VMReg(), F10->as_VMReg(), F11->as_VMReg(), F12->as_VMReg(), F13->as_VMReg() }; const int num_java_iarg_registers = sizeof(java_iarg_reg) / sizeof(java_iarg_reg[0]); const int num_java_farg_registers = sizeof(java_farg_reg) / sizeof(java_farg_reg[0]); STATIC_ASSERT(num_java_iarg_registers == Argument::n_int_register_parameters_j); STATIC_ASSERT(num_java_farg_registers == Argument::n_float_register_parameters_j); int SharedRuntime::java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed) { // C2c calling conventions for compiled-compiled calls. // Put 8 ints/longs into registers _AND_ 13 float/doubles into // registers _AND_ put the rest on the stack. const int inc_stk_for_intfloat = 1; // 1 slots for ints and floats const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles int i; VMReg reg; int stk = 0; int ireg = 0; int freg = 0; // We put the first 8 arguments into registers and the rest on the // stack, float arguments are already in their argument registers // due to c2c calling conventions (see calling_convention). for (int i = 0; i < total_args_passed; ++i) { switch(sig_bt[i]) { case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: if (ireg < num_java_iarg_registers) { // Put int/ptr in register reg = java_iarg_reg[ireg]; ++ireg; } else { // Put int/ptr on stack. reg = VMRegImpl::stack2reg(stk); stk += inc_stk_for_intfloat; } regs[i].set1(reg); break; case T_LONG: assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half"); if (ireg < num_java_iarg_registers) { // Put long in register. reg = java_iarg_reg[ireg]; ++ireg; } else { // Put long on stack. They must be aligned to 2 slots. if (stk & 0x1) ++stk; reg = VMRegImpl::stack2reg(stk); stk += inc_stk_for_longdouble; } regs[i].set2(reg); break; case T_OBJECT: case T_ARRAY: case T_ADDRESS: if (ireg < num_java_iarg_registers) { // Put ptr in register. reg = java_iarg_reg[ireg]; ++ireg; } else { // Put ptr on stack. Objects must be aligned to 2 slots too, // because "64-bit pointers record oop-ishness on 2 aligned // adjacent registers." (see OopFlow::build_oop_map). if (stk & 0x1) ++stk; reg = VMRegImpl::stack2reg(stk); stk += inc_stk_for_longdouble; } regs[i].set2(reg); break; case T_FLOAT: if (freg < num_java_farg_registers) { // Put float in register. reg = java_farg_reg[freg]; ++freg; } else { // Put float on stack. reg = VMRegImpl::stack2reg(stk); stk += inc_stk_for_intfloat; } regs[i].set1(reg); break; case T_DOUBLE: assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half"); if (freg < num_java_farg_registers) { // Put double in register. reg = java_farg_reg[freg]; ++freg; } else { // Put double on stack. They must be aligned to 2 slots. if (stk & 0x1) ++stk; reg = VMRegImpl::stack2reg(stk); stk += inc_stk_for_longdouble; } regs[i].set2(reg); break; case T_VOID: // Do not count halves. regs[i].set_bad(); break; default: ShouldNotReachHere(); } } return stk; } #if defined(COMPILER1) || defined(COMPILER2) // Calling convention for calling C code. int SharedRuntime::c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed) { // Calling conventions for C runtime calls and calls to JNI native methods. // // PPC64 convention: Hoist the first 8 int/ptr/long's in the first 8 // int regs, leaving int regs undefined if the arg is flt/dbl. Hoist // the first 13 flt/dbl's in the first 13 fp regs but additionally // copy flt/dbl to the stack if they are beyond the 8th argument. const VMReg iarg_reg[8] = { R3->as_VMReg(), R4->as_VMReg(), R5->as_VMReg(), R6->as_VMReg(), R7->as_VMReg(), R8->as_VMReg(), R9->as_VMReg(), R10->as_VMReg() }; const VMReg farg_reg[13] = { F1->as_VMReg(), F2->as_VMReg(), F3->as_VMReg(), F4->as_VMReg(), F5->as_VMReg(), F6->as_VMReg(), F7->as_VMReg(), F8->as_VMReg(), F9->as_VMReg(), F10->as_VMReg(), F11->as_VMReg(), F12->as_VMReg(), F13->as_VMReg() }; // Check calling conventions consistency. assert(sizeof(iarg_reg) / sizeof(iarg_reg[0]) == Argument::n_int_register_parameters_c && sizeof(farg_reg) / sizeof(farg_reg[0]) == Argument::n_float_register_parameters_c, "consistency"); const int additional_frame_header_slots = ((frame::native_abi_minframe_size - frame::jit_out_preserve_size) / VMRegImpl::stack_slot_size); const int float_offset_in_slots = Argument::float_on_stack_offset_in_bytes_c / VMRegImpl::stack_slot_size; VMReg reg; int arg = 0; int freg = 0; bool stack_used = false; for (int i = 0; i < total_args_passed; ++i, ++arg) { // Each argument corresponds to a slot in the Parameter Save Area (if not omitted) int stk = (arg * 2) + additional_frame_header_slots; switch(sig_bt[i]) { // // If arguments 0-7 are integers, they are passed in integer registers. // Argument i is placed in iarg_reg[i]. // case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: // We must cast ints to longs and use full 64 bit stack slots // here. Thus fall through, handle as long. case T_LONG: case T_OBJECT: case T_ARRAY: case T_ADDRESS: case T_METADATA: // Oops are already boxed if required (JNI). if (arg < Argument::n_int_register_parameters_c) { reg = iarg_reg[arg]; } else { reg = VMRegImpl::stack2reg(stk); stack_used = true; } regs[i].set2(reg); break; // // Floats are treated differently from int regs: The first 13 float arguments // are passed in registers (not the float args among the first 13 args). // Thus argument i is NOT passed in farg_reg[i] if it is float. It is passed // in farg_reg[j] if argument i is the j-th float argument of this call. // case T_FLOAT: if (freg < Argument::n_float_register_parameters_c) { // Put float in register ... reg = farg_reg[freg]; ++freg; } else { // Put float on stack. reg = VMRegImpl::stack2reg(stk + float_offset_in_slots); stack_used = true; } regs[i].set1(reg); break; case T_DOUBLE: assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half"); if (freg < Argument::n_float_register_parameters_c) { // Put double in register ... reg = farg_reg[freg]; ++freg; } else { // Put double on stack. reg = VMRegImpl::stack2reg(stk); stack_used = true; } regs[i].set2(reg); break; case T_VOID: // Do not count halves. regs[i].set_bad(); --arg; break; default: ShouldNotReachHere(); } } // Return size of the stack frame excluding the jit_out_preserve part in single-word slots. #if defined(ABI_ELFv2) assert(additional_frame_header_slots == 0, "ABIv2 shouldn't use extra slots"); // ABIv2 allows omitting the Parameter Save Area if the callee's prototype // indicates that all parameters can be passed in registers. return stack_used ? (arg * 2) : 0; #else // The Parameter Save Area needs to be at least 8 double-word slots for ABIv1. // We have to add extra slots because ABIv1 uses a larger header. return MAX2(arg, 8) * 2 + additional_frame_header_slots; #endif } #endif // COMPILER2 int SharedRuntime::vector_calling_convention(VMRegPair *regs, uint num_bits, uint total_args_passed) { Unimplemented(); return 0; } static address gen_c2i_adapter(MacroAssembler *masm, int total_args_passed, int comp_args_on_stack, const BasicType *sig_bt, const VMRegPair *regs, Label& call_interpreter, const Register& ientry) { address c2i_entrypoint; const Register sender_SP = R21_sender_SP; // == R21_tmp1 const Register code = R22_tmp2; //const Register ientry = R23_tmp3; const Register value_regs[] = { R24_tmp4, R25_tmp5, R26_tmp6 }; const int num_value_regs = sizeof(value_regs) / sizeof(Register); int value_regs_index = 0; const Register return_pc = R27_tmp7; const Register tmp = R28_tmp8; assert_different_registers(sender_SP, code, ientry, return_pc, tmp); // Adapter needs TOP_IJAVA_FRAME_ABI. const int adapter_size = frame::top_ijava_frame_abi_size + align_up(total_args_passed * wordSize, frame::alignment_in_bytes); // regular (verified) c2i entry point c2i_entrypoint = __ pc(); // Does compiled code exists? If yes, patch the caller's callsite. __ ld(code, method_(code)); __ cmpdi(CR0, code, 0); __ ld(ientry, method_(interpreter_entry)); // preloaded __ beq(CR0, call_interpreter); // Patch caller's callsite, method_(code) was not null which means that // compiled code exists. __ mflr(return_pc); __ std(return_pc, _abi0(lr), R1_SP); RegisterSaver::push_frame_and_save_argument_registers(masm, tmp, adapter_size, total_args_passed, regs); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite), R19_method, return_pc); RegisterSaver::restore_argument_registers_and_pop_frame(masm, adapter_size, total_args_passed, regs); __ ld(return_pc, _abi0(lr), R1_SP); __ ld(ientry, method_(interpreter_entry)); // preloaded __ mtlr(return_pc); // Call the interpreter. __ BIND(call_interpreter); __ mtctr(ientry); // Get a copy of the current SP for loading caller's arguments. __ mr(sender_SP, R1_SP); // Add space for the adapter. __ resize_frame(-adapter_size, R12_scratch2); int st_off = adapter_size - wordSize; // Write the args into the outgoing interpreter space. for (int i = 0; i < total_args_passed; i++) { VMReg r_1 = regs[i].first(); VMReg r_2 = regs[i].second(); if (!r_1->is_valid()) { assert(!r_2->is_valid(), ""); continue; } if (r_1->is_stack()) { Register tmp_reg = value_regs[value_regs_index]; value_regs_index = (value_regs_index + 1) % num_value_regs; // The calling convention produces OptoRegs that ignore the out // preserve area (JIT's ABI). We must account for it here. int ld_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; if (!r_2->is_valid()) { __ lwz(tmp_reg, ld_off, sender_SP); } else { __ ld(tmp_reg, ld_off, sender_SP); } // Pretend stack targets were loaded into tmp_reg. r_1 = tmp_reg->as_VMReg(); } if (r_1->is_Register()) { Register r = r_1->as_Register(); if (!r_2->is_valid()) { __ stw(r, st_off, R1_SP); st_off-=wordSize; } else { // Longs are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { DEBUG_ONLY( __ li(tmp, 0); __ std(tmp, st_off, R1_SP); ) st_off-=wordSize; } __ std(r, st_off, R1_SP); st_off-=wordSize; } } else { assert(r_1->is_FloatRegister(), ""); FloatRegister f = r_1->as_FloatRegister(); if (!r_2->is_valid()) { __ stfs(f, st_off, R1_SP); st_off-=wordSize; } else { // In 64bit, doubles are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. // One of these should get known junk... DEBUG_ONLY( __ li(tmp, 0); __ std(tmp, st_off, R1_SP); ) st_off-=wordSize; __ stfd(f, st_off, R1_SP); st_off-=wordSize; } } } // Jump to the interpreter just as if interpreter was doing it. __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1); // load TOS __ addi(R15_esp, R1_SP, st_off); // Frame_manager expects initial_caller_sp (= SP without resize by c2i) in R21_tmp1. assert(sender_SP == R21_sender_SP, "passing initial caller's SP in wrong register"); __ bctr(); return c2i_entrypoint; } void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm, int total_args_passed, int comp_args_on_stack, const BasicType *sig_bt, const VMRegPair *regs) { // Load method's entry-point from method. __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method); __ mtctr(R12_scratch2); // We will only enter here from an interpreted frame and never from after // passing thru a c2i. Azul allowed this but we do not. If we lose the // race and use a c2i we will remain interpreted for the race loser(s). // This removes all sorts of headaches on the x86 side and also eliminates // the possibility of having c2i -> i2c -> c2i -> ... endless transitions. // Note: r13 contains the senderSP on entry. We must preserve it since // we may do a i2c -> c2i transition if we lose a race where compiled // code goes non-entrant while we get args ready. // In addition we use r13 to locate all the interpreter args as // we must align the stack to 16 bytes on an i2c entry else we // lose alignment we expect in all compiled code and register // save code can segv when fxsave instructions find improperly // aligned stack pointer. const Register ld_ptr = R15_esp; const Register value_regs[] = { R22_tmp2, R23_tmp3, R24_tmp4, R25_tmp5, R26_tmp6 }; const int num_value_regs = sizeof(value_regs) / sizeof(Register); int value_regs_index = 0; int ld_offset = total_args_passed*wordSize; // Cut-out for having no stack args. Since up to 2 int/oop args are passed // in registers, we will occasionally have no stack args. int comp_words_on_stack = 0; if (comp_args_on_stack) { // Sig words on the stack are greater-than VMRegImpl::stack0. Those in // registers are below. By subtracting stack0, we either get a negative // number (all values in registers) or the maximum stack slot accessed. // Convert 4-byte c2 stack slots to words. comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord; // Round up to miminum stack alignment, in wordSize. comp_words_on_stack = align_up(comp_words_on_stack, 2); __ resize_frame(-comp_words_on_stack * wordSize, R11_scratch1); } // Now generate the shuffle code. Pick up all register args and move the // rest through register value=Z_R12. BLOCK_COMMENT("Shuffle arguments"); for (int i = 0; i < total_args_passed; i++) { if (sig_bt[i] == T_VOID) { assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half"); continue; } // Pick up 0, 1 or 2 words from ld_ptr. assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), "scrambled load targets?"); VMReg r_1 = regs[i].first(); VMReg r_2 = regs[i].second(); if (!r_1->is_valid()) { assert(!r_2->is_valid(), ""); continue; } if (r_1->is_FloatRegister()) { if (!r_2->is_valid()) { __ lfs(r_1->as_FloatRegister(), ld_offset, ld_ptr); ld_offset-=wordSize; } else { // Skip the unused interpreter slot. __ lfd(r_1->as_FloatRegister(), ld_offset-wordSize, ld_ptr); ld_offset-=2*wordSize; } } else { Register r; if (r_1->is_stack()) { // Must do a memory to memory move thru "value". r = value_regs[value_regs_index]; value_regs_index = (value_regs_index + 1) % num_value_regs; } else { r = r_1->as_Register(); } if (!r_2->is_valid()) { // Not sure we need to do this but it shouldn't hurt. if (is_reference_type(sig_bt[i]) || sig_bt[i] == T_ADDRESS) { __ ld(r, ld_offset, ld_ptr); ld_offset-=wordSize; } else { __ lwz(r, ld_offset, ld_ptr); ld_offset-=wordSize; } } else { // In 64bit, longs are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) { ld_offset-=wordSize; } __ ld(r, ld_offset, ld_ptr); ld_offset-=wordSize; } if (r_1->is_stack()) { // Now store value where the compiler expects it int st_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots())*VMRegImpl::stack_slot_size; if (sig_bt[i] == T_INT || sig_bt[i] == T_FLOAT ||sig_bt[i] == T_BOOLEAN || sig_bt[i] == T_SHORT || sig_bt[i] == T_CHAR || sig_bt[i] == T_BYTE) { __ stw(r, st_off, R1_SP); } else { __ std(r, st_off, R1_SP); } } } } __ push_cont_fastpath(); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about BLOCK_COMMENT("Store method"); // Store method into thread->callee_target. // We might end up in handle_wrong_method if the callee is // deoptimized as we race thru here. If that happens we don't want // to take a safepoint because the caller frame will look // interpreted and arguments are now "compiled" so it is much better // to make this transition invisible to the stack walking // code. Unfortunately if we try and find the callee by normal means // a safepoint is possible. So we stash the desired callee in the // thread and the vm will find there should this case occur. __ std(R19_method, thread_(callee_target)); // Jump to the compiled code just as if compiled code was doing it. __ bctr(); } void SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm, int total_args_passed, int comp_args_on_stack, const BasicType *sig_bt, const VMRegPair *regs, AdapterHandlerEntry* handler) { address i2c_entry; address c2i_unverified_entry; address c2i_entry; // entry: i2c __ align(CodeEntryAlignment); i2c_entry = __ pc(); gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs); // entry: c2i unverified __ align(CodeEntryAlignment); BLOCK_COMMENT("c2i unverified entry"); c2i_unverified_entry = __ pc(); // inline_cache contains a CompiledICData const Register ic = R19_inline_cache_reg; const Register ic_klass = R11_scratch1; const Register receiver_klass = R12_scratch2; const Register code = R21_tmp1; const Register ientry = R23_tmp3; assert_different_registers(ic, ic_klass, receiver_klass, R3_ARG1, code, ientry); assert(R11_scratch1 == R11, "need prologue scratch register"); Label call_interpreter; __ ic_check(4 /* end_alignment */); __ ld(R19_method, CompiledICData::speculated_method_offset(), ic); // Argument is valid and klass is as expected, continue. __ ld(code, method_(code)); __ cmpdi(CR0, code, 0); __ ld(ientry, method_(interpreter_entry)); // preloaded __ beq_predict_taken(CR0, call_interpreter); // Branch to ic_miss_stub. __ b64_patchable((address)SharedRuntime::get_ic_miss_stub(), relocInfo::runtime_call_type); // entry: c2i c2i_entry = __ pc(); // Class initialization barrier for static methods address c2i_no_clinit_check_entry = nullptr; if (VM_Version::supports_fast_class_init_checks()) { Label L_skip_barrier; { // Bypass the barrier for non-static methods __ lhz(R0, in_bytes(Method::access_flags_offset()), R19_method); __ andi_(R0, R0, JVM_ACC_STATIC); __ beq(CR0, L_skip_barrier); // non-static } Register klass = R11_scratch1; __ load_method_holder(klass, R19_method); __ clinit_barrier(klass, R16_thread, &L_skip_barrier /*L_fast_path*/); __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub(), R0); __ mtctr(klass); __ bctr(); __ bind(L_skip_barrier); c2i_no_clinit_check_entry = __ pc(); } BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); bs->c2i_entry_barrier(masm, /* tmp register*/ ic_klass, /* tmp register*/ receiver_klass, /* tmp register*/ code); gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, call_interpreter, ientry); handler->set_entry_points(i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry); return; } // An oop arg. Must pass a handle not the oop itself. static void object_move(MacroAssembler* masm, int frame_size_in_slots, OopMap* oop_map, int oop_handle_offset, bool is_receiver, int* receiver_offset, VMRegPair src, VMRegPair dst, Register r_caller_sp, Register r_temp_1, Register r_temp_2) { assert(!is_receiver || (is_receiver && (*receiver_offset == -1)), "receiver has already been moved"); // We must pass a handle. First figure out the location we use as a handle. if (src.first()->is_stack()) { // stack to stack or reg const Register r_handle = dst.first()->is_stack() ? r_temp_1 : dst.first()->as_Register(); Label skip; const int oop_slot_in_callers_frame = reg2slot(src.first()); guarantee(!is_receiver, "expecting receiver in register"); oop_map->set_oop(VMRegImpl::stack2reg(oop_slot_in_callers_frame + frame_size_in_slots)); __ addi(r_handle, r_caller_sp, reg2offset(src.first())); __ ld( r_temp_2, reg2offset(src.first()), r_caller_sp); __ cmpdi(CR0, r_temp_2, 0); __ bne(CR0, skip); // Use a null handle if oop is null. __ li(r_handle, 0); __ bind(skip); if (dst.first()->is_stack()) { // stack to stack __ std(r_handle, reg2offset(dst.first()), R1_SP); } else { // stack to reg // Nothing to do, r_handle is already the dst register. } } else { // reg to stack or reg const Register r_oop = src.first()->as_Register(); const Register r_handle = dst.first()->is_stack() ? r_temp_1 : dst.first()->as_Register(); const int oop_slot = (r_oop->encoding()-R3_ARG1->encoding()) * VMRegImpl::slots_per_word + oop_handle_offset; // in slots const int oop_offset = oop_slot * VMRegImpl::stack_slot_size; Label skip; if (is_receiver) { *receiver_offset = oop_offset; } oop_map->set_oop(VMRegImpl::stack2reg(oop_slot)); __ std( r_oop, oop_offset, R1_SP); __ addi(r_handle, R1_SP, oop_offset); __ cmpdi(CR0, r_oop, 0); __ bne(CR0, skip); // Use a null handle if oop is null. __ li(r_handle, 0); __ bind(skip); if (dst.first()->is_stack()) { // reg to stack __ std(r_handle, reg2offset(dst.first()), R1_SP); } else { // reg to reg // Nothing to do, r_handle is already the dst register. } } } static void int_move(MacroAssembler*masm, VMRegPair src, VMRegPair dst, Register r_caller_sp, Register r_temp) { assert(src.first()->is_valid(), "incoming must be int"); assert(dst.first()->is_valid() && dst.second() == dst.first()->next(), "outgoing must be long"); if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack to stack __ lwa(r_temp, reg2offset(src.first()), r_caller_sp); __ std(r_temp, reg2offset(dst.first()), R1_SP); } else { // stack to reg __ lwa(dst.first()->as_Register(), reg2offset(src.first()), r_caller_sp); } } else if (dst.first()->is_stack()) { // reg to stack __ extsw(r_temp, src.first()->as_Register()); __ std(r_temp, reg2offset(dst.first()), R1_SP); } else { // reg to reg __ extsw(dst.first()->as_Register(), src.first()->as_Register()); } } static void long_move(MacroAssembler*masm, VMRegPair src, VMRegPair dst, Register r_caller_sp, Register r_temp) { assert(src.first()->is_valid() && src.second() == src.first()->next(), "incoming must be long"); assert(dst.first()->is_valid() && dst.second() == dst.first()->next(), "outgoing must be long"); if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack to stack __ ld( r_temp, reg2offset(src.first()), r_caller_sp); __ std(r_temp, reg2offset(dst.first()), R1_SP); } else { // stack to reg __ ld(dst.first()->as_Register(), reg2offset(src.first()), r_caller_sp); } } else if (dst.first()->is_stack()) { // reg to stack __ std(src.first()->as_Register(), reg2offset(dst.first()), R1_SP); } else { // reg to reg if (dst.first()->as_Register() != src.first()->as_Register()) __ mr(dst.first()->as_Register(), src.first()->as_Register()); } } static void float_move(MacroAssembler*masm, VMRegPair src, VMRegPair dst, Register r_caller_sp, Register r_temp) { assert(src.first()->is_valid() && !src.second()->is_valid(), "incoming must be float"); assert(dst.first()->is_valid() && !dst.second()->is_valid(), "outgoing must be float"); if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack to stack __ lwz(r_temp, reg2offset(src.first()), r_caller_sp); __ stw(r_temp, reg2offset(dst.first()), R1_SP); } else { // stack to reg __ lfs(dst.first()->as_FloatRegister(), reg2offset(src.first()), r_caller_sp); } } else if (dst.first()->is_stack()) { // reg to stack __ stfs(src.first()->as_FloatRegister(), reg2offset(dst.first()), R1_SP); } else { // reg to reg if (dst.first()->as_FloatRegister() != src.first()->as_FloatRegister()) __ fmr(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister()); } } static void double_move(MacroAssembler*masm, VMRegPair src, VMRegPair dst, Register r_caller_sp, Register r_temp) { assert(src.first()->is_valid() && src.second() == src.first()->next(), "incoming must be double"); assert(dst.first()->is_valid() && dst.second() == dst.first()->next(), "outgoing must be double"); if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack to stack __ ld( r_temp, reg2offset(src.first()), r_caller_sp); __ std(r_temp, reg2offset(dst.first()), R1_SP); } else { // stack to reg __ lfd(dst.first()->as_FloatRegister(), reg2offset(src.first()), r_caller_sp); } } else if (dst.first()->is_stack()) { // reg to stack __ stfd(src.first()->as_FloatRegister(), reg2offset(dst.first()), R1_SP); } else { // reg to reg if (dst.first()->as_FloatRegister() != src.first()->as_FloatRegister()) __ fmr(dst.first()->as_FloatRegister(), src.first()->as_FloatRegister()); } } void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { switch (ret_type) { case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: __ stw (R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_ARRAY: case T_OBJECT: case T_LONG: __ std (R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_FLOAT: __ stfs(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_DOUBLE: __ stfd(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_VOID: break; default: ShouldNotReachHere(); break; } } void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { switch (ret_type) { case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: __ lwz(R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_ARRAY: case T_OBJECT: case T_LONG: __ ld (R3_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_FLOAT: __ lfs(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_DOUBLE: __ lfd(F1_RET, frame_slots*VMRegImpl::stack_slot_size, R1_SP); break; case T_VOID: break; default: ShouldNotReachHere(); break; } } static void verify_oop_args(MacroAssembler* masm, const methodHandle& method, const BasicType* sig_bt, const VMRegPair* regs) { Register temp_reg = R19_method; // not part of any compiled calling seq if (VerifyOops) { for (int i = 0; i < method->size_of_parameters(); i++) { if (is_reference_type(sig_bt[i])) { VMReg r = regs[i].first(); assert(r->is_valid(), "bad oop arg"); if (r->is_stack()) { __ ld(temp_reg, reg2offset(r), R1_SP); __ verify_oop(temp_reg, FILE_AND_LINE); } else { __ verify_oop(r->as_Register(), FILE_AND_LINE); } } } } } static void gen_special_dispatch(MacroAssembler* masm, const methodHandle& method, const BasicType* sig_bt, const VMRegPair* regs) { verify_oop_args(masm, method, sig_bt, regs); vmIntrinsics::ID iid = method->intrinsic_id(); // Now write the args into the outgoing interpreter space bool has_receiver = false; Register receiver_reg = noreg; int member_arg_pos = -1; Register member_reg = noreg; int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid); if (ref_kind != 0) { member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument member_reg = R19_method; // known to be free at this point has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind); } else if (iid == vmIntrinsics::_invokeBasic) { has_receiver = true; } else if (iid == vmIntrinsics::_linkToNative) { member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument member_reg = R19_method; // known to be free at this point } else { fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid)); } if (member_reg != noreg) { // Load the member_arg into register, if necessary. SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs); VMReg r = regs[member_arg_pos].first(); if (r->is_stack()) { __ ld(member_reg, reg2offset(r), R1_SP); } else { // no data motion is needed member_reg = r->as_Register(); } } if (has_receiver) { // Make sure the receiver is loaded into a register. assert(method->size_of_parameters() > 0, "oob"); assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object"); VMReg r = regs[0].first(); assert(r->is_valid(), "bad receiver arg"); if (r->is_stack()) { // Porting note: This assumes that compiled calling conventions always // pass the receiver oop in a register. If this is not true on some // platform, pick a temp and load the receiver from stack. fatal("receiver always in a register"); receiver_reg = R11_scratch1; // TODO (hs24): is R11_scratch1 really free at this point? __ ld(receiver_reg, reg2offset(r), R1_SP); } else { // no data motion is needed receiver_reg = r->as_Register(); } } // Figure out which address we are really jumping to: MethodHandles::generate_method_handle_dispatch(masm, iid, receiver_reg, member_reg, /*for_compiler_entry:*/ true); } //---------------------------- continuation_enter_setup --------------------------- // // Frame setup. // // Arguments: // None. // // Results: // R1_SP: pointer to blank ContinuationEntry in the pushed frame. // // Kills: // R0, R20 // static OopMap* continuation_enter_setup(MacroAssembler* masm, int& framesize_words) { assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, ""); assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, ""); assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, ""); const int frame_size_in_bytes = (int)ContinuationEntry::size(); assert(is_aligned(frame_size_in_bytes, frame::alignment_in_bytes), "alignment error"); framesize_words = frame_size_in_bytes / wordSize; DEBUG_ONLY(__ block_comment("setup {")); // Save return pc and push entry frame const Register return_pc = R20; __ mflr(return_pc); __ std(return_pc, _abi0(lr), R1_SP); // SP->lr = return_pc __ push_frame(frame_size_in_bytes , R0); // SP -= frame_size_in_bytes OopMap* map = new OopMap((int)frame_size_in_bytes / VMRegImpl::stack_slot_size, 0 /* arg_slots*/); __ ld_ptr(R0, JavaThread::cont_entry_offset(), R16_thread); __ st_ptr(R1_SP, JavaThread::cont_entry_offset(), R16_thread); __ st_ptr(R0, ContinuationEntry::parent_offset(), R1_SP); DEBUG_ONLY(__ block_comment("} setup")); return map; } //---------------------------- fill_continuation_entry --------------------------- // // Initialize the new ContinuationEntry. // // Arguments: // R1_SP: pointer to blank Continuation entry // reg_cont_obj: pointer to the continuation // reg_flags: flags // // Results: // R1_SP: pointer to filled out ContinuationEntry // // Kills: // R8_ARG6, R9_ARG7, R10_ARG8 // static void fill_continuation_entry(MacroAssembler* masm, Register reg_cont_obj, Register reg_flags) { assert_different_registers(reg_cont_obj, reg_flags); Register zero = R8_ARG6; Register tmp2 = R9_ARG7; Register tmp3 = R10_ARG8; DEBUG_ONLY(__ block_comment("fill {")); #ifdef ASSERT __ load_const_optimized(tmp2, ContinuationEntry::cookie_value()); __ stw(tmp2, in_bytes(ContinuationEntry::cookie_offset()), R1_SP); #endif //ASSERT __ li(zero, 0); __ st_ptr(reg_cont_obj, ContinuationEntry::cont_offset(), R1_SP); __ stw(reg_flags, in_bytes(ContinuationEntry::flags_offset()), R1_SP); __ st_ptr(zero, ContinuationEntry::chunk_offset(), R1_SP); __ stw(zero, in_bytes(ContinuationEntry::argsize_offset()), R1_SP); __ stw(zero, in_bytes(ContinuationEntry::pin_count_offset()), R1_SP); __ ld_ptr(tmp2, JavaThread::cont_fastpath_offset(), R16_thread); __ ld(tmp3, in_bytes(JavaThread::held_monitor_count_offset()), R16_thread); __ st_ptr(tmp2, ContinuationEntry::parent_cont_fastpath_offset(), R1_SP); __ std(tmp3, in_bytes(ContinuationEntry::parent_held_monitor_count_offset()), R1_SP); __ st_ptr(zero, JavaThread::cont_fastpath_offset(), R16_thread); __ std(zero, in_bytes(JavaThread::held_monitor_count_offset()), R16_thread); DEBUG_ONLY(__ block_comment("} fill")); } //---------------------------- continuation_enter_cleanup --------------------------- // // Copy corresponding attributes from the top ContinuationEntry to the JavaThread // before deleting it. // // Arguments: // R1_SP: pointer to the ContinuationEntry // // Results: // None. // // Kills: // R8_ARG6, R9_ARG7, R10_ARG8, R15_esp // static void continuation_enter_cleanup(MacroAssembler* masm) { Register tmp1 = R8_ARG6; Register tmp2 = R9_ARG7; Register tmp3 = R10_ARG8; #ifdef ASSERT __ block_comment("clean {"); __ ld_ptr(tmp1, JavaThread::cont_entry_offset(), R16_thread); __ cmpd(CR0, R1_SP, tmp1); __ asm_assert_eq(FILE_AND_LINE ": incorrect R1_SP"); #endif __ ld_ptr(tmp1, ContinuationEntry::parent_cont_fastpath_offset(), R1_SP); __ st_ptr(tmp1, JavaThread::cont_fastpath_offset(), R16_thread); if (CheckJNICalls) { // Check if this is a virtual thread continuation Label L_skip_vthread_code; __ lwz(R0, in_bytes(ContinuationEntry::flags_offset()), R1_SP); __ cmpwi(CR0, R0, 0); __ beq(CR0, L_skip_vthread_code); // If the held monitor count is > 0 and this vthread is terminating then // it failed to release a JNI monitor. So we issue the same log message // that JavaThread::exit does. __ ld(R0, in_bytes(JavaThread::jni_monitor_count_offset()), R16_thread); __ cmpdi(CR0, R0, 0); __ beq(CR0, L_skip_vthread_code); // Save return value potentially containing the exception oop Register ex_oop = R15_esp; // nonvolatile register __ mr(ex_oop, R3_RET); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::log_jni_monitor_still_held)); // Restore potental return value __ mr(R3_RET, ex_oop); // For vthreads we have to explicitly zero the JNI monitor count of the carrier // on termination. The held count is implicitly zeroed below when we restore from // the parent held count (which has to be zero). __ li(tmp1, 0); __ std(tmp1, in_bytes(JavaThread::jni_monitor_count_offset()), R16_thread); __ bind(L_skip_vthread_code); } #ifdef ASSERT else { // Check if this is a virtual thread continuation Label L_skip_vthread_code; __ lwz(R0, in_bytes(ContinuationEntry::flags_offset()), R1_SP); __ cmpwi(CR0, R0, 0); __ beq(CR0, L_skip_vthread_code); // See comment just above. If not checking JNI calls the JNI count is only // needed for assertion checking. __ li(tmp1, 0); __ std(tmp1, in_bytes(JavaThread::jni_monitor_count_offset()), R16_thread); __ bind(L_skip_vthread_code); } #endif __ ld(tmp2, in_bytes(ContinuationEntry::parent_held_monitor_count_offset()), R1_SP); __ ld_ptr(tmp3, ContinuationEntry::parent_offset(), R1_SP); __ std(tmp2, in_bytes(JavaThread::held_monitor_count_offset()), R16_thread); __ st_ptr(tmp3, JavaThread::cont_entry_offset(), R16_thread); DEBUG_ONLY(__ block_comment("} clean")); } static void check_continuation_enter_argument(VMReg actual_vmreg, Register expected_reg, const char* name) { assert(!actual_vmreg->is_stack(), "%s cannot be on stack", name); assert(actual_vmreg->as_Register() == expected_reg, "%s is in unexpected register: %s instead of %s", name, actual_vmreg->as_Register()->name(), expected_reg->name()); } static void gen_continuation_enter(MacroAssembler* masm, const VMRegPair* regs, int& exception_offset, OopMapSet* oop_maps, int& frame_complete, int& framesize_words, int& interpreted_entry_offset, int& compiled_entry_offset) { // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread) int pos_cont_obj = 0; int pos_is_cont = 1; int pos_is_virtual = 2; // The platform-specific calling convention may present the arguments in various registers. // To simplify the rest of the code, we expect the arguments to reside at these known // registers, and we additionally check the placement here in case calling convention ever // changes. Register reg_cont_obj = R3_ARG1; Register reg_is_cont = R4_ARG2; Register reg_is_virtual = R5_ARG3; check_continuation_enter_argument(regs[pos_cont_obj].first(), reg_cont_obj, "Continuation object"); check_continuation_enter_argument(regs[pos_is_cont].first(), reg_is_cont, "isContinue"); check_continuation_enter_argument(regs[pos_is_virtual].first(), reg_is_virtual, "isVirtualThread"); address resolve_static_call = SharedRuntime::get_resolve_static_call_stub(); address start = __ pc(); Label L_thaw, L_exit; // i2i entry used at interp_only_mode only interpreted_entry_offset = __ pc() - start; { #ifdef ASSERT Label is_interp_only; __ lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread); __ cmpwi(CR0, R0, 0); __ bne(CR0, is_interp_only); __ stop("enterSpecial interpreter entry called when not in interp_only_mode"); __ bind(is_interp_only); #endif // Read interpreter arguments into registers (this is an ad-hoc i2c adapter) __ ld(reg_cont_obj, Interpreter::stackElementSize*3, R15_esp); __ lwz(reg_is_cont, Interpreter::stackElementSize*2, R15_esp); __ lwz(reg_is_virtual, Interpreter::stackElementSize*1, R15_esp); __ push_cont_fastpath(); OopMap* map = continuation_enter_setup(masm, framesize_words); // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe, // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway. fill_continuation_entry(masm, reg_cont_obj, reg_is_virtual); // If isContinue, call to thaw. Otherwise, call Continuation.enter(Continuation c, boolean isContinue) __ cmpwi(CR0, reg_is_cont, 0); __ bne(CR0, L_thaw); // --- call Continuation.enter(Continuation c, boolean isContinue) // Emit compiled static call. The call will be always resolved to the c2i // entry of Continuation.enter(Continuation c, boolean isContinue). // There are special cases in SharedRuntime::resolve_static_call_C() and // SharedRuntime::resolve_sub_helper_internal() to achieve this // See also corresponding call below. address c2i_call_pc = __ pc(); int start_offset = __ offset(); // Put the entry point as a constant into the constant pool. const address entry_point_toc_addr = __ address_constant(resolve_static_call, RelocationHolder::none); const int entry_point_toc_offset = __ offset_to_method_toc(entry_point_toc_addr); guarantee(entry_point_toc_addr != nullptr, "const section overflow"); // Emit the trampoline stub which will be related to the branch-and-link below. address stub = __ emit_trampoline_stub(entry_point_toc_offset, start_offset); guarantee(stub != nullptr, "no space for trampoline stub"); __ relocate(relocInfo::static_call_type); // Note: At this point we do not have the address of the trampoline // stub, and the entry point might be too far away for bl, so __ pc() // serves as dummy and the bl will be patched later. __ bl(__ pc()); oop_maps->add_gc_map(__ pc() - start, map); __ post_call_nop(); __ b(L_exit); // static stub for the call above stub = CompiledDirectCall::emit_to_interp_stub(masm, c2i_call_pc); guarantee(stub != nullptr, "no space for static stub"); } // compiled entry __ align(CodeEntryAlignment); compiled_entry_offset = __ pc() - start; OopMap* map = continuation_enter_setup(masm, framesize_words); // Frame is now completed as far as size and linkage. frame_complete =__ pc() - start; fill_continuation_entry(masm, reg_cont_obj, reg_is_virtual); // If isContinue, call to thaw. Otherwise, call Continuation.enter(Continuation c, boolean isContinue) __ cmpwi(CR0, reg_is_cont, 0); __ bne(CR0, L_thaw); // --- call Continuation.enter(Continuation c, boolean isContinue) // Emit compiled static call // The call needs to be resolved. There's a special case for this in // SharedRuntime::find_callee_info_helper() which calls // LinkResolver::resolve_continuation_enter() which resolves the call to // Continuation.enter(Continuation c, boolean isContinue). address call_pc = __ pc(); int start_offset = __ offset(); // Put the entry point as a constant into the constant pool. const address entry_point_toc_addr = __ address_constant(resolve_static_call, RelocationHolder::none); const int entry_point_toc_offset = __ offset_to_method_toc(entry_point_toc_addr); guarantee(entry_point_toc_addr != nullptr, "const section overflow"); // Emit the trampoline stub which will be related to the branch-and-link below. address stub = __ emit_trampoline_stub(entry_point_toc_offset, start_offset); guarantee(stub != nullptr, "no space for trampoline stub"); __ relocate(relocInfo::static_call_type); // Note: At this point we do not have the address of the trampoline // stub, and the entry point might be too far away for bl, so __ pc() // serves as dummy and the bl will be patched later. __ bl(__ pc()); oop_maps->add_gc_map(__ pc() - start, map); __ post_call_nop(); __ b(L_exit); // --- Thawing path __ bind(L_thaw); ContinuationEntry::_thaw_call_pc_offset = __ pc() - start; __ add_const_optimized(R0, R29_TOC, MacroAssembler::offset_to_global_toc(StubRoutines::cont_thaw())); __ mtctr(R0); __ bctrl(); oop_maps->add_gc_map(__ pc() - start, map->deep_copy()); ContinuationEntry::_return_pc_offset = __ pc() - start; __ post_call_nop(); // --- Normal exit (resolve/thawing) __ bind(L_exit); ContinuationEntry::_cleanup_offset = __ pc() - start; continuation_enter_cleanup(masm); // Pop frame and return DEBUG_ONLY(__ ld_ptr(R0, 0, R1_SP)); __ addi(R1_SP, R1_SP, framesize_words*wordSize); DEBUG_ONLY(__ cmpd(CR0, R0, R1_SP)); __ asm_assert_eq(FILE_AND_LINE ": inconsistent frame size"); __ ld(R0, _abi0(lr), R1_SP); // Return pc __ mtlr(R0); __ blr(); // --- Exception handling path exception_offset = __ pc() - start; continuation_enter_cleanup(masm); Register ex_pc = R17_tos; // nonvolatile register Register ex_oop = R15_esp; // nonvolatile register __ ld(ex_pc, _abi0(callers_sp), R1_SP); // Load caller's return pc __ ld(ex_pc, _abi0(lr), ex_pc); __ mr(ex_oop, R3_RET); // save return value containing the exception oop __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), R16_thread, ex_pc); __ mtlr(R3_RET); // the exception handler __ ld(R1_SP, _abi0(callers_sp), R1_SP); // remove enterSpecial frame // Continue at exception handler // See OptoRuntime::generate_exception_blob for register arguments __ mr(R3_ARG1, ex_oop); // pass exception oop __ mr(R4_ARG2, ex_pc); // pass exception pc __ blr(); // static stub for the call above stub = CompiledDirectCall::emit_to_interp_stub(masm, call_pc); guarantee(stub != nullptr, "no space for static stub"); } static void gen_continuation_yield(MacroAssembler* masm, const VMRegPair* regs, OopMapSet* oop_maps, int& frame_complete, int& framesize_words, int& compiled_entry_offset) { Register tmp = R10_ARG8; const int framesize_bytes = (int)align_up((int)frame::native_abi_reg_args_size, frame::alignment_in_bytes); framesize_words = framesize_bytes / wordSize; address start = __ pc(); compiled_entry_offset = __ pc() - start; // Save return pc and push entry frame __ mflr(tmp); __ std(tmp, _abi0(lr), R1_SP); // SP->lr = return_pc __ push_frame(framesize_bytes , R0); // SP -= frame_size_in_bytes DEBUG_ONLY(__ block_comment("Frame Complete")); frame_complete = __ pc() - start; address last_java_pc = __ pc(); // This nop must be exactly at the PC we push into the frame info. // We use this nop for fast CodeBlob lookup, associate the OopMap // with it right away. __ post_call_nop(); OopMap* map = new OopMap(framesize_bytes / VMRegImpl::stack_slot_size, 1); oop_maps->add_gc_map(last_java_pc - start, map); __ calculate_address_from_global_toc(tmp, last_java_pc); // will be relocated __ set_last_Java_frame(R1_SP, tmp); __ call_VM_leaf(Continuation::freeze_entry(), R16_thread, R1_SP); __ reset_last_Java_frame(); Label L_pinned; __ cmpwi(CR0, R3_RET, 0); __ bne(CR0, L_pinned); // yield succeeded // Pop frames of continuation including this stub's frame __ ld_ptr(R1_SP, JavaThread::cont_entry_offset(), R16_thread); // The frame pushed by gen_continuation_enter is on top now again continuation_enter_cleanup(masm); // Pop frame and return Label L_return; __ bind(L_return); __ pop_frame(); __ ld(R0, _abi0(lr), R1_SP); // Return pc __ mtlr(R0); __ blr(); // yield failed - continuation is pinned __ bind(L_pinned); // handle pending exception thrown by freeze __ ld(tmp, in_bytes(JavaThread::pending_exception_offset()), R16_thread); __ cmpdi(CR0, tmp, 0); __ beq(CR0, L_return); // return if no exception is pending __ pop_frame(); __ ld(R0, _abi0(lr), R1_SP); // Return pc __ mtlr(R0); __ load_const_optimized(tmp, StubRoutines::forward_exception_entry(), R0); __ mtctr(tmp); __ bctr(); } void SharedRuntime::continuation_enter_cleanup(MacroAssembler* masm) { ::continuation_enter_cleanup(masm); } // --------------------------------------------------------------------------- // Generate a native wrapper for a given method. The method takes arguments // in the Java compiled code convention, marshals them to the native // convention (handlizes oops, etc), transitions to native, makes the call, // returns to java state (possibly blocking), unhandlizes any result and // returns. // // Critical native functions are a shorthand for the use of // GetPrimtiveArrayCritical and disallow the use of any other JNI // functions. The wrapper is expected to unpack the arguments before // passing them to the callee. Critical native functions leave the state _in_Java, // since they cannot stop for GC. // Some other parts of JNI setup are skipped like the tear down of the JNI handle // block and the check for pending exceptions it's impossible for them // to be thrown. // nmethod *SharedRuntime::generate_native_wrapper(MacroAssembler *masm, const methodHandle& method, int compile_id, BasicType *in_sig_bt, VMRegPair *in_regs, BasicType ret_type) { if (method->is_continuation_native_intrinsic()) { int exception_offset = -1; OopMapSet* oop_maps = new OopMapSet(); int frame_complete = -1; int stack_slots = -1; int interpreted_entry_offset = -1; int vep_offset = -1; if (method->is_continuation_enter_intrinsic()) { gen_continuation_enter(masm, in_regs, exception_offset, oop_maps, frame_complete, stack_slots, interpreted_entry_offset, vep_offset); } else if (method->is_continuation_yield_intrinsic()) { gen_continuation_yield(masm, in_regs, oop_maps, frame_complete, stack_slots, vep_offset); } else { guarantee(false, "Unknown Continuation native intrinsic"); } #ifdef ASSERT if (method->is_continuation_enter_intrinsic()) { assert(interpreted_entry_offset != -1, "Must be set"); assert(exception_offset != -1, "Must be set"); } else { assert(interpreted_entry_offset == -1, "Must be unset"); assert(exception_offset == -1, "Must be unset"); } assert(frame_complete != -1, "Must be set"); assert(stack_slots != -1, "Must be set"); assert(vep_offset != -1, "Must be set"); #endif __ flush(); nmethod* nm = nmethod::new_native_nmethod(method, compile_id, masm->code(), vep_offset, frame_complete, stack_slots, in_ByteSize(-1), in_ByteSize(-1), oop_maps, exception_offset); if (nm == nullptr) return nm; if (method->is_continuation_enter_intrinsic()) { ContinuationEntry::set_enter_code(nm, interpreted_entry_offset); } else if (method->is_continuation_yield_intrinsic()) { _cont_doYield_stub = nm; } return nm; } if (method->is_method_handle_intrinsic()) { vmIntrinsics::ID iid = method->intrinsic_id(); intptr_t start = (intptr_t)__ pc(); int vep_offset = ((intptr_t)__ pc()) - start; gen_special_dispatch(masm, method, in_sig_bt, in_regs); int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period __ flush(); int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually return nmethod::new_native_nmethod(method, compile_id, masm->code(), vep_offset, frame_complete, stack_slots / VMRegImpl::slots_per_word, in_ByteSize(-1), in_ByteSize(-1), (OopMapSet*)nullptr); } address native_func = method->native_function(); assert(native_func != nullptr, "must have function"); // First, create signature for outgoing C call // -------------------------------------------------------------------------- int total_in_args = method->size_of_parameters(); // We have received a description of where all the java args are located // on entry to the wrapper. We need to convert these args to where // the jni function will expect them. To figure out where they go // we convert the java signature to a C signature by inserting // the hidden arguments as arg[0] and possibly arg[1] (static method) // Calculate the total number of C arguments and create arrays for the // signature and the outgoing registers. // On ppc64, we have two arrays for the outgoing registers, because // some floating-point arguments must be passed in registers _and_ // in stack locations. bool method_is_static = method->is_static(); int total_c_args = total_in_args + (method_is_static ? 2 : 1); BasicType *out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args); VMRegPair *out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args); // Create the signature for the C call: // 1) add the JNIEnv* // 2) add the class if the method is static // 3) copy the rest of the incoming signature (shifted by the number of // hidden arguments). int argc = 0; out_sig_bt[argc++] = T_ADDRESS; if (method->is_static()) { out_sig_bt[argc++] = T_OBJECT; } for (int i = 0; i < total_in_args ; i++ ) { out_sig_bt[argc++] = in_sig_bt[i]; } // Compute the wrapper's frame size. // -------------------------------------------------------------------------- // Now figure out where the args must be stored and how much stack space // they require. // // Compute framesize for the wrapper. We need to handlize all oops in // incoming registers. // // Calculate the total number of stack slots we will need: // 1) abi requirements // 2) outgoing arguments // 3) space for inbound oop handle area // 4) space for handlizing a klass if static method // 5) space for a lock if synchronized method // 6) workspace for saving return values, int <-> float reg moves, etc. // 7) alignment // // Layout of the native wrapper frame: // (stack grows upwards, memory grows downwards) // // NW [ABI_REG_ARGS] <-- 1) R1_SP // [outgoing arguments] <-- 2) R1_SP + out_arg_slot_offset // [oopHandle area] <-- 3) R1_SP + oop_handle_offset // klass <-- 4) R1_SP + klass_offset // lock <-- 5) R1_SP + lock_offset // [workspace] <-- 6) R1_SP + workspace_offset // [alignment] (optional) <-- 7) // caller [JIT_TOP_ABI_48] <-- r_callers_sp // // - *_slot_offset Indicates offset from SP in number of stack slots. // - *_offset Indicates offset from SP in bytes. int stack_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args) + // 1+2) SharedRuntime::out_preserve_stack_slots(); // See c_calling_convention. // Now the space for the inbound oop handle area. int total_save_slots = num_java_iarg_registers * VMRegImpl::slots_per_word; int oop_handle_slot_offset = stack_slots; stack_slots += total_save_slots; // 3) int klass_slot_offset = 0; int klass_offset = -1; if (method_is_static) { // 4) klass_slot_offset = stack_slots; klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size; stack_slots += VMRegImpl::slots_per_word; } int lock_slot_offset = 0; int lock_offset = -1; if (method->is_synchronized()) { // 5) lock_slot_offset = stack_slots; lock_offset = lock_slot_offset * VMRegImpl::stack_slot_size; stack_slots += VMRegImpl::slots_per_word; } int workspace_slot_offset = stack_slots; // 6) stack_slots += 2; // Now compute actual number of stack words we need. // Rounding to make stack properly aligned. stack_slots = align_up(stack_slots, // 7) frame::alignment_in_bytes / VMRegImpl::stack_slot_size); int frame_size_in_bytes = stack_slots * VMRegImpl::stack_slot_size; // Now we can start generating code. // -------------------------------------------------------------------------- intptr_t start_pc = (intptr_t)__ pc(); intptr_t vep_start_pc; intptr_t frame_done_pc; Label handle_pending_exception; Label last_java_pc; Register r_callers_sp = R21; Register r_temp_1 = R22; Register r_temp_2 = R23; Register r_temp_3 = R24; Register r_temp_4 = R25; Register r_temp_5 = R26; Register r_temp_6 = R27; Register r_last_java_pc = R28; Register r_carg1_jnienv = noreg; Register r_carg2_classorobject = noreg; r_carg1_jnienv = out_regs[0].first()->as_Register(); r_carg2_classorobject = out_regs[1].first()->as_Register(); // Generate the Unverified Entry Point (UEP). // -------------------------------------------------------------------------- assert(start_pc == (intptr_t)__ pc(), "uep must be at start"); // Check ic: object class == cached class? if (!method_is_static) { __ ic_check(4 /* end_alignment */); } // Generate the Verified Entry Point (VEP). // -------------------------------------------------------------------------- vep_start_pc = (intptr_t)__ pc(); if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) { Label L_skip_barrier; Register klass = r_temp_1; // Notify OOP recorder (don't need the relocation) AddressLiteral md = __ constant_metadata_address(method->method_holder()); __ load_const_optimized(klass, md.value(), R0); __ clinit_barrier(klass, R16_thread, &L_skip_barrier /*L_fast_path*/); __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub(), R0); __ mtctr(klass); __ bctr(); __ bind(L_skip_barrier); } __ save_LR(r_temp_1); __ generate_stack_overflow_check(frame_size_in_bytes); // Check before creating frame. __ mr(r_callers_sp, R1_SP); // Remember frame pointer. __ push_frame(frame_size_in_bytes, r_temp_1); // Push the c2n adapter's frame. BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); bs->nmethod_entry_barrier(masm, r_temp_1); frame_done_pc = (intptr_t)__ pc(); // Native nmethod wrappers never take possession of the oop arguments. // So the caller will gc the arguments. // The only thing we need an oopMap for is if the call is static. // // An OopMap for lock (and class if static), and one for the VM call itself. OopMapSet *oop_maps = new OopMapSet(); OopMap *oop_map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); // Move arguments from register/stack to register/stack. // -------------------------------------------------------------------------- // // We immediately shuffle the arguments so that for any vm call we have // to make from here on out (sync slow path, jvmti, etc.) we will have // captured the oops from our caller and have a valid oopMap for them. // // Natives require 1 or 2 extra arguments over the normal ones: the JNIEnv* // (derived from JavaThread* which is in R16_thread) and, if static, // the class mirror instead of a receiver. This pretty much guarantees that // register layout will not match. We ignore these extra arguments during // the shuffle. The shuffle is described by the two calling convention // vectors we have in our possession. We simply walk the java vector to // get the source locations and the c vector to get the destinations. // Record sp-based slot for receiver on stack for non-static methods. int receiver_offset = -1; // We move the arguments backward because the floating point registers // destination will always be to a register with a greater or equal // register number or the stack. // in is the index of the incoming Java arguments // out is the index of the outgoing C arguments #ifdef ASSERT bool reg_destroyed[Register::number_of_registers]; bool freg_destroyed[FloatRegister::number_of_registers]; for (int r = 0 ; r < Register::number_of_registers ; r++) { reg_destroyed[r] = false; } for (int f = 0 ; f < FloatRegister::number_of_registers ; f++) { freg_destroyed[f] = false; } #endif // ASSERT for (int in = total_in_args - 1, out = total_c_args - 1; in >= 0 ; in--, out--) { #ifdef ASSERT if (in_regs[in].first()->is_Register()) { assert(!reg_destroyed[in_regs[in].first()->as_Register()->encoding()], "ack!"); } else if (in_regs[in].first()->is_FloatRegister()) { assert(!freg_destroyed[in_regs[in].first()->as_FloatRegister()->encoding()], "ack!"); } if (out_regs[out].first()->is_Register()) { reg_destroyed[out_regs[out].first()->as_Register()->encoding()] = true; } else if (out_regs[out].first()->is_FloatRegister()) { freg_destroyed[out_regs[out].first()->as_FloatRegister()->encoding()] = true; } #endif // ASSERT switch (in_sig_bt[in]) { case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: // Move int and do sign extension. int_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1); break; case T_LONG: long_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1); break; case T_ARRAY: case T_OBJECT: object_move(masm, stack_slots, oop_map, oop_handle_slot_offset, ((in == 0) && (!method_is_static)), &receiver_offset, in_regs[in], out_regs[out], r_callers_sp, r_temp_1, r_temp_2); break; case T_VOID: break; case T_FLOAT: float_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1); break; case T_DOUBLE: double_move(masm, in_regs[in], out_regs[out], r_callers_sp, r_temp_1); break; case T_ADDRESS: fatal("found type (T_ADDRESS) in java args"); break; default: ShouldNotReachHere(); break; } } // Pre-load a static method's oop into ARG2. // Used both by locking code and the normal JNI call code. if (method_is_static) { __ set_oop_constant(JNIHandles::make_local(method->method_holder()->java_mirror()), r_carg2_classorobject); // Now handlize the static class mirror in carg2. It's known not-null. __ std(r_carg2_classorobject, klass_offset, R1_SP); oop_map->set_oop(VMRegImpl::stack2reg(klass_slot_offset)); __ addi(r_carg2_classorobject, R1_SP, klass_offset); } // Get JNIEnv* which is first argument to native. __ addi(r_carg1_jnienv, R16_thread, in_bytes(JavaThread::jni_environment_offset())); // NOTE: // // We have all of the arguments setup at this point. // We MUST NOT touch any outgoing regs from this point on. // So if we must call out we must push a new frame. // The last java pc will also be used as resume pc if this is the wrapper for wait0. // For this purpose the precise location matters but not for oopmap lookup. __ calculate_address_from_global_toc(r_last_java_pc, last_java_pc, true, true, true, true); // Make sure that thread is non-volatile; it crosses a bunch of VM calls below. assert(R16_thread->is_nonvolatile(), "thread must be in non-volatile register"); # if 0 // DTrace method entry # endif // Lock a synchronized method. // -------------------------------------------------------------------------- if (method->is_synchronized()) { Register r_oop = r_temp_4; const Register r_box = r_temp_5; Label done, locked; // Load the oop for the object or class. r_carg2_classorobject contains // either the handlized oop from the incoming arguments or the handlized // class mirror (if the method is static). __ ld(r_oop, 0, r_carg2_classorobject); // Get the lock box slot's address. __ addi(r_box, R1_SP, lock_offset); // Try fastpath for locking. if (LockingMode == LM_LIGHTWEIGHT) { // fast_lock kills r_temp_1, r_temp_2, r_temp_3. Register r_temp_3_or_noreg = UseObjectMonitorTable ? r_temp_3 : noreg; __ compiler_fast_lock_lightweight_object(CR0, r_oop, r_box, r_temp_1, r_temp_2, r_temp_3_or_noreg); } else { // fast_lock kills r_temp_1, r_temp_2, r_temp_3. __ compiler_fast_lock_object(CR0, r_oop, r_box, r_temp_1, r_temp_2, r_temp_3); } __ beq(CR0, locked); // None of the above fast optimizations worked so we have to get into the // slow case of monitor enter. Inline a special case of call_VM that // disallows any pending_exception. // Save argument registers and leave room for C-compatible ABI_REG_ARGS. int frame_size = frame::native_abi_reg_args_size + align_up(total_c_args * wordSize, frame::alignment_in_bytes); __ mr(R11_scratch1, R1_SP); RegisterSaver::push_frame_and_save_argument_registers(masm, R12_scratch2, frame_size, total_c_args, out_regs); // Do the call. __ set_last_Java_frame(R11_scratch1, r_last_java_pc); assert(r_last_java_pc->is_nonvolatile(), "r_last_java_pc needs to be preserved accross complete_monitor_locking_C call"); // The following call will not be preempted. // push_cont_fastpath forces freeze slow path in case we try to preempt where we will pin the // vthread to the carrier (see FreezeBase::recurse_freeze_native_frame()). __ push_cont_fastpath(); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), r_oop, r_box, R16_thread); __ pop_cont_fastpath(); __ reset_last_Java_frame(); RegisterSaver::restore_argument_registers_and_pop_frame(masm, frame_size, total_c_args, out_regs); __ asm_assert_mem8_is_zero(thread_(pending_exception), "no pending exception allowed on exit from SharedRuntime::complete_monitor_locking_C"); __ bind(locked); } __ set_last_Java_frame(R1_SP, r_last_java_pc); // Publish thread state // -------------------------------------------------------------------------- // Transition from _thread_in_Java to _thread_in_native. __ li(R0, _thread_in_native); __ release(); // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size"); __ stw(R0, thread_(thread_state)); // The JNI call // -------------------------------------------------------------------------- __ call_c(native_func, relocInfo::runtime_call_type); // Now, we are back from the native code. // Unpack the native result. // -------------------------------------------------------------------------- // For int-types, we do any needed sign-extension required. // Care must be taken that the return values (R3_RET and F1_RET) // will survive any VM calls for blocking or unlocking. // An OOP result (handle) is done specially in the slow-path code. switch (ret_type) { case T_VOID: break; // Nothing to do! case T_FLOAT: break; // Got it where we want it (unless slow-path). case T_DOUBLE: break; // Got it where we want it (unless slow-path). case T_LONG: break; // Got it where we want it (unless slow-path). case T_OBJECT: break; // Really a handle. // Cannot de-handlize until after reclaiming jvm_lock. case T_ARRAY: break; case T_BOOLEAN: { // 0 -> false(0); !0 -> true(1) __ normalize_bool(R3_RET); break; } case T_BYTE: { // sign extension __ extsb(R3_RET, R3_RET); break; } case T_CHAR: { // unsigned result __ andi(R3_RET, R3_RET, 0xffff); break; } case T_SHORT: { // sign extension __ extsh(R3_RET, R3_RET); break; } case T_INT: // nothing to do break; default: ShouldNotReachHere(); break; } // Publish thread state // -------------------------------------------------------------------------- // Switch thread to "native transition" state before reading the // synchronization state. This additional state is necessary because reading // and testing the synchronization state is not atomic w.r.t. GC, as this // scenario demonstrates: // - Java thread A, in _thread_in_native state, loads _not_synchronized // and is preempted. // - VM thread changes sync state to synchronizing and suspends threads // for GC. // - Thread A is resumed to finish this native method, but doesn't block // here since it didn't see any synchronization in progress, and escapes. // Transition from _thread_in_native to _thread_in_native_trans. __ li(R0, _thread_in_native_trans); __ release(); // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size"); __ stw(R0, thread_(thread_state)); // Must we block? // -------------------------------------------------------------------------- // Block, if necessary, before resuming in _thread_in_Java state. // In order for GC to work, don't clear the last_Java_sp until after blocking. { Label no_block, sync; // Force this write out before the read below. if (!UseSystemMemoryBarrier) { __ fence(); } Register sync_state_addr = r_temp_4; Register sync_state = r_temp_5; Register suspend_flags = r_temp_6; // No synchronization in progress nor yet synchronized // (cmp-br-isync on one path, release (same as acquire on PPC64) on the other path). __ safepoint_poll(sync, sync_state, true /* at_return */, false /* in_nmethod */); // Not suspended. // TODO: PPC port assert(4 == Thread::sz_suspend_flags(), "unexpected field size"); __ lwz(suspend_flags, thread_(suspend_flags)); __ cmpwi(CR1, suspend_flags, 0); __ beq(CR1, no_block); // Block. Save any potential method result value before the operation and // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this // lets us share the oopMap we used when we went native rather than create // a distinct one for this pc. __ bind(sync); __ isync(); address entry_point = CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans); save_native_result(masm, ret_type, workspace_slot_offset); __ call_VM_leaf(entry_point, R16_thread); restore_native_result(masm, ret_type, workspace_slot_offset); __ bind(no_block); // Publish thread state. // -------------------------------------------------------------------------- // Thread state is thread_in_native_trans. Any safepoint blocking has // already happened so we can now change state to _thread_in_Java. // Transition from _thread_in_native_trans to _thread_in_Java. __ li(R0, _thread_in_Java); __ lwsync(); // Acquire safepoint and suspend state, release thread state. // TODO: PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size"); __ stw(R0, thread_(thread_state)); // Check preemption for Object.wait() if (LockingMode != LM_LEGACY && method->is_object_wait0()) { Label not_preempted; __ ld(R0, in_bytes(JavaThread::preempt_alternate_return_offset()), R16_thread); __ cmpdi(CR0, R0, 0); __ beq(CR0, not_preempted); __ mtlr(R0); __ li(R0, 0); __ std(R0, in_bytes(JavaThread::preempt_alternate_return_offset()), R16_thread); __ blr(); __ bind(not_preempted); } __ bind(last_java_pc); // We use the same pc/oopMap repeatedly when we call out above. intptr_t oopmap_pc = (intptr_t) __ pc(); oop_maps->add_gc_map(oopmap_pc - start_pc, oop_map); } // Reguard any pages if necessary. // -------------------------------------------------------------------------- Label no_reguard; __ lwz(r_temp_1, thread_(stack_guard_state)); __ cmpwi(CR0, r_temp_1, StackOverflow::stack_guard_yellow_reserved_disabled); __ bne(CR0, no_reguard); save_native_result(masm, ret_type, workspace_slot_offset); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)); restore_native_result(masm, ret_type, workspace_slot_offset); __ bind(no_reguard); // Unlock // -------------------------------------------------------------------------- if (method->is_synchronized()) { const Register r_oop = r_temp_4; const Register r_box = r_temp_5; const Register r_exception = r_temp_6; Label done; // Get oop and address of lock object box. if (method_is_static) { assert(klass_offset != -1, ""); __ ld(r_oop, klass_offset, R1_SP); } else { assert(receiver_offset != -1, ""); __ ld(r_oop, receiver_offset, R1_SP); } __ addi(r_box, R1_SP, lock_offset); // Try fastpath for unlocking. if (LockingMode == LM_LIGHTWEIGHT) { __ compiler_fast_unlock_lightweight_object(CR0, r_oop, r_box, r_temp_1, r_temp_2, r_temp_3); } else { __ compiler_fast_unlock_object(CR0, r_oop, r_box, r_temp_1, r_temp_2, r_temp_3); } __ beq(CR0, done); // Save and restore any potential method result value around the unlocking operation. save_native_result(masm, ret_type, workspace_slot_offset); // Must save pending exception around the slow-path VM call. Since it's a // leaf call, the pending exception (if any) can be kept in a register. __ ld(r_exception, thread_(pending_exception)); assert(r_exception->is_nonvolatile(), "exception register must be non-volatile"); __ li(R0, 0); __ std(R0, thread_(pending_exception)); // Slow case of monitor enter. // Inline a special case of call_VM that disallows any pending_exception. // Arguments are (oop obj, BasicLock* lock, JavaThread* thread). __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), r_oop, r_box, R16_thread); __ asm_assert_mem8_is_zero(thread_(pending_exception), "no pending exception allowed on exit from SharedRuntime::complete_monitor_unlocking_C"); restore_native_result(masm, ret_type, workspace_slot_offset); // Check_forward_pending_exception jump to forward_exception if any pending // exception is set. The forward_exception routine expects to see the // exception in pending_exception and not in a register. Kind of clumsy, // since all folks who branch to forward_exception must have tested // pending_exception first and hence have it in a register already. __ std(r_exception, thread_(pending_exception)); __ bind(done); } # if 0 // DTrace method exit # endif // Clear "last Java frame" SP and PC. // -------------------------------------------------------------------------- // Last java frame won't be set if we're resuming after preemption bool maybe_preempted = LockingMode != LM_LEGACY && method->is_object_wait0(); __ reset_last_Java_frame(!maybe_preempted /* check_last_java_sp */); // Unbox oop result, e.g. JNIHandles::resolve value. // -------------------------------------------------------------------------- if (is_reference_type(ret_type)) { __ resolve_jobject(R3_RET, r_temp_1, r_temp_2, MacroAssembler::PRESERVATION_NONE); } if (CheckJNICalls) { // clear_pending_jni_exception_check __ load_const_optimized(R0, 0L); __ st_ptr(R0, JavaThread::pending_jni_exception_check_fn_offset(), R16_thread); } // Reset handle block. // -------------------------------------------------------------------------- __ ld(r_temp_1, thread_(active_handles)); // TODO: PPC port assert(4 == JNIHandleBlock::top_size_in_bytes(), "unexpected field size"); __ li(r_temp_2, 0); __ stw(r_temp_2, in_bytes(JNIHandleBlock::top_offset()), r_temp_1); // Prepare for return // -------------------------------------------------------------------------- __ pop_frame(); __ restore_LR(R11); #if INCLUDE_JFR // We need to do a poll test after unwind in case the sampler // managed to sample the native frame after returning to Java. Label L_stub; int safepoint_offset = __ offset(); if (!UseSIGTRAP) { __ relocate(relocInfo::poll_return_type); } __ safepoint_poll(L_stub, r_temp_2, true /* at_return */, true /* in_nmethod: frame already popped */); #endif // INCLUDE_JFR // Check for pending exceptions. // -------------------------------------------------------------------------- __ ld(r_temp_2, thread_(pending_exception)); __ cmpdi(CR0, r_temp_2, 0); __ bne(CR0, handle_pending_exception); // Return. __ blr(); // Handler for return safepoint (out-of-line). #if INCLUDE_JFR if (!UseSIGTRAP) { __ bind(L_stub); __ jump_to_polling_page_return_handler_blob(safepoint_offset); } #endif // INCLUDE_JFR // Handler for pending exceptions (out-of-line). // -------------------------------------------------------------------------- // Since this is a native call, we know the proper exception handler // is the empty function. We just pop this frame and then jump to // forward_exception_entry. __ bind(handle_pending_exception); __ b64_patchable((address)StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type); // Done. // -------------------------------------------------------------------------- __ flush(); nmethod *nm = nmethod::new_native_nmethod(method, compile_id, masm->code(), vep_start_pc-start_pc, frame_done_pc-start_pc, stack_slots / VMRegImpl::slots_per_word, (method_is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)), in_ByteSize(lock_offset), oop_maps); return nm; } // This function returns the adjust size (in number of words) to a c2i adapter // activation for use during deoptimization. int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) { return align_up((callee_locals - callee_parameters) * Interpreter::stackElementWords, frame::frame_alignment_in_words); } uint SharedRuntime::in_preserve_stack_slots() { return frame::jit_in_preserve_size / VMRegImpl::stack_slot_size; } uint SharedRuntime::out_preserve_stack_slots() { #if defined(COMPILER1) || defined(COMPILER2) return frame::jit_out_preserve_size / VMRegImpl::stack_slot_size; #else return 0; #endif } VMReg SharedRuntime::thread_register() { // On PPC virtual threads don't save the JavaThread* in their context (e.g. C1 stub frames). ShouldNotCallThis(); return nullptr; } #if defined(COMPILER1) || defined(COMPILER2) // Frame generation for deopt and uncommon trap blobs. static void push_skeleton_frame(MacroAssembler* masm, bool deopt, /* Read */ Register unroll_block_reg, /* Update */ Register frame_sizes_reg, Register number_of_frames_reg, Register pcs_reg, /* Invalidate */ Register frame_size_reg, Register pc_reg) { __ ld(pc_reg, 0, pcs_reg); __ ld(frame_size_reg, 0, frame_sizes_reg); __ std(pc_reg, _abi0(lr), R1_SP); __ push_frame(frame_size_reg, R0/*tmp*/); __ std(R1_SP, _ijava_state_neg(sender_sp), R1_SP); __ addi(number_of_frames_reg, number_of_frames_reg, -1); __ addi(frame_sizes_reg, frame_sizes_reg, wordSize); __ addi(pcs_reg, pcs_reg, wordSize); } // Loop through the UnrollBlock info and create new frames. static void push_skeleton_frames(MacroAssembler* masm, bool deopt, /* read */ Register unroll_block_reg, /* invalidate */ Register frame_sizes_reg, Register number_of_frames_reg, Register pcs_reg, Register frame_size_reg, Register pc_reg) { Label loop; // _number_of_frames is of type int (deoptimization.hpp) __ lwa(number_of_frames_reg, in_bytes(Deoptimization::UnrollBlock::number_of_frames_offset()), unroll_block_reg); __ ld(pcs_reg, in_bytes(Deoptimization::UnrollBlock::frame_pcs_offset()), unroll_block_reg); __ ld(frame_sizes_reg, in_bytes(Deoptimization::UnrollBlock::frame_sizes_offset()), unroll_block_reg); // stack: (caller_of_deoptee, ...). // At this point we either have an interpreter frame or a compiled // frame on top of stack. If it is a compiled frame we push a new c2i // adapter here // Memorize top-frame stack-pointer. __ mr(frame_size_reg/*old_sp*/, R1_SP); // Resize interpreter top frame OR C2I adapter. // At this moment, the top frame (which is the caller of the deoptee) is // an interpreter frame or a newly pushed C2I adapter or an entry frame. // The top frame has a TOP_IJAVA_FRAME_ABI and the frame contains the // outgoing arguments. // // In order to push the interpreter frame for the deoptee, we need to // resize the top frame such that we are able to place the deoptee's // locals in the frame. // Additionally, we have to turn the top frame's TOP_IJAVA_FRAME_ABI // into a valid PARENT_IJAVA_FRAME_ABI. __ lwa(R11_scratch1, in_bytes(Deoptimization::UnrollBlock::caller_adjustment_offset()), unroll_block_reg); __ neg(R11_scratch1, R11_scratch1); // R11_scratch1 contains size of locals for frame resizing. // R12_scratch2 contains top frame's lr. // Resize frame by complete frame size prevents TOC from being // overwritten by locals. A more stack space saving way would be // to copy the TOC to its location in the new abi. __ addi(R11_scratch1, R11_scratch1, - frame::parent_ijava_frame_abi_size); // now, resize the frame __ resize_frame(R11_scratch1, pc_reg/*tmp*/); // In the case where we have resized a c2i frame above, the optional // alignment below the locals has size 32 (why?). __ std(R12_scratch2, _abi0(lr), R1_SP); // Initialize initial_caller_sp. __ std(frame_size_reg, _ijava_state_neg(sender_sp), R1_SP); #ifdef ASSERT // Make sure that there is at least one entry in the array. __ cmpdi(CR0, number_of_frames_reg, 0); __ asm_assert_ne("array_size must be > 0"); #endif // Now push the new interpreter frames. // __ bind(loop); // Allocate a new frame, fill in the pc. push_skeleton_frame(masm, deopt, unroll_block_reg, frame_sizes_reg, number_of_frames_reg, pcs_reg, frame_size_reg, pc_reg); __ cmpdi(CR0, number_of_frames_reg, 0); __ bne(CR0, loop); // Get the return address pointing into the template interpreter. __ ld(R0, 0, pcs_reg); // Store it in the top interpreter frame. __ std(R0, _abi0(lr), R1_SP); // Initialize frame_manager_lr of interpreter top frame. } #endif void SharedRuntime::generate_deopt_blob() { // Allocate space for the code ResourceMark rm; // Setup code generation tools const char* name = SharedRuntime::stub_name(SharedStubId::deopt_id); CodeBuffer buffer(name, 2048, 1024); InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer); Label exec_mode_initialized; int frame_size_in_words; OopMap* map = nullptr; OopMapSet *oop_maps = new OopMapSet(); // size of ABI112 plus spill slots for R3_RET and F1_RET. const int frame_size_in_bytes = frame::native_abi_reg_args_spill_size; const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); int first_frame_size_in_bytes = 0; // frame size of "unpack frame" for call to fetch_unroll_info. const Register exec_mode_reg = R21_tmp1; const address start = __ pc(); #if defined(COMPILER1) || defined(COMPILER2) // -------------------------------------------------------------------------- // Prolog for non exception case! // We have been called from the deopt handler of the deoptee. // // deoptee: // ... // call X // ... // deopt_handler: call_deopt_stub // cur. return pc --> ... // // So currently SR_LR points behind the call in the deopt handler. // We adjust it such that it points to the start of the deopt handler. // The return_pc has been stored in the frame of the deoptee and // will replace the address of the deopt_handler in the call // to Deoptimization::fetch_unroll_info below. // We can't grab a free register here, because all registers may // contain live values, so let the RegisterSaver do the adjustment // of the return pc. const int return_pc_adjustment_no_exception = -MacroAssembler::bl64_patchable_size; // Push the "unpack frame" // Save everything in sight. map = RegisterSaver::push_frame_reg_args_and_save_live_registers(masm, &first_frame_size_in_bytes, /*generate_oop_map=*/ true, return_pc_adjustment_no_exception, RegisterSaver::return_pc_is_lr); assert(map != nullptr, "OopMap must have been created"); __ li(exec_mode_reg, Deoptimization::Unpack_deopt); // Save exec mode for unpack_frames. __ b(exec_mode_initialized); // -------------------------------------------------------------------------- // Prolog for exception case // An exception is pending. // We have been called with a return (interpreter) or a jump (exception blob). // // - R3_ARG1: exception oop // - R4_ARG2: exception pc int exception_offset = __ pc() - start; BLOCK_COMMENT("Prolog for exception case"); // Store exception oop and pc in thread (location known to GC). // This is needed since the call to "fetch_unroll_info()" may safepoint. __ std(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread); __ std(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread); __ std(R4_ARG2, _abi0(lr), R1_SP); // Vanilla deoptimization with an exception pending in exception_oop. int exception_in_tls_offset = __ pc() - start; // Push the "unpack frame". // Save everything in sight. RegisterSaver::push_frame_reg_args_and_save_live_registers(masm, &first_frame_size_in_bytes, /*generate_oop_map=*/ false, /*return_pc_adjustment_exception=*/ 0, RegisterSaver::return_pc_is_pre_saved); // Deopt during an exception. Save exec mode for unpack_frames. __ li(exec_mode_reg, Deoptimization::Unpack_exception); // fall through int reexecute_offset = 0; #ifdef COMPILER1 __ b(exec_mode_initialized); // Reexecute entry, similar to c2 uncommon trap reexecute_offset = __ pc() - start; RegisterSaver::push_frame_reg_args_and_save_live_registers(masm, &first_frame_size_in_bytes, /*generate_oop_map=*/ false, /*return_pc_adjustment_reexecute=*/ 0, RegisterSaver::return_pc_is_pre_saved); __ li(exec_mode_reg, Deoptimization::Unpack_reexecute); #endif // -------------------------------------------------------------------------- __ BIND(exec_mode_initialized); const Register unroll_block_reg = R22_tmp2; // We need to set `last_Java_frame' because `fetch_unroll_info' will // call `last_Java_frame()'. The value of the pc in the frame is not // particularly important. It just needs to identify this blob. __ set_last_Java_frame(R1_SP, noreg); // With EscapeAnalysis turned on, this call may safepoint! __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info), R16_thread, exec_mode_reg); address calls_return_pc = __ last_calls_return_pc(); // Set an oopmap for the call site that describes all our saved registers. oop_maps->add_gc_map(calls_return_pc - start, map); __ reset_last_Java_frame(); // Save the return value. __ mr(unroll_block_reg, R3_RET); // Restore only the result registers that have been saved // by save_volatile_registers(...). RegisterSaver::restore_result_registers(masm, first_frame_size_in_bytes); // reload the exec mode from the UnrollBlock (it might have changed) __ lwz(exec_mode_reg, in_bytes(Deoptimization::UnrollBlock::unpack_kind_offset()), unroll_block_reg); // In excp_deopt_mode, restore and clear exception oop which we // stored in the thread during exception entry above. The exception // oop will be the return value of this stub. Label skip_restore_excp; __ cmpdi(CR0, exec_mode_reg, Deoptimization::Unpack_exception); __ bne(CR0, skip_restore_excp); __ ld(R3_RET, in_bytes(JavaThread::exception_oop_offset()), R16_thread); __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread); __ li(R0, 0); __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread); __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread); __ BIND(skip_restore_excp); __ pop_frame(); // stack: (deoptee, optional i2c, caller of deoptee, ...). // pop the deoptee's frame __ pop_frame(); // stack: (caller_of_deoptee, ...). // Freezing continuation frames requires that the caller is trimmed to unextended sp if compiled. // If not compiled the loaded value is equal to the current SP (see frame::initial_deoptimization_info()) // and the frame is effectively not resized. Register caller_sp = R23_tmp3; __ ld_ptr(caller_sp, Deoptimization::UnrollBlock::initial_info_offset(), unroll_block_reg); __ resize_frame_absolute(caller_sp, R24_tmp4, R25_tmp5); // Loop through the `UnrollBlock' info and create interpreter frames. push_skeleton_frames(masm, true/*deopt*/, unroll_block_reg, R23_tmp3, R24_tmp4, R25_tmp5, R26_tmp6, R27_tmp7); // stack: (skeletal interpreter frame, ..., optional skeletal // interpreter frame, optional c2i, caller of deoptee, ...). // push an `unpack_frame' taking care of float / int return values. __ push_frame(frame_size_in_bytes, R0/*tmp*/); // stack: (unpack frame, skeletal interpreter frame, ..., optional // skeletal interpreter frame, optional c2i, caller of deoptee, // ...). // Spill live volatile registers since we'll do a call. __ std( R3_RET, _native_abi_reg_args_spill(spill_ret), R1_SP); __ stfd(F1_RET, _native_abi_reg_args_spill(spill_fret), R1_SP); // Let the unpacker layout information in the skeletal frames just // allocated. __ calculate_address_from_global_toc(R3_RET, calls_return_pc, true, true, true, true); __ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R3_RET); // This is a call to a LEAF method, so no oop map is required. __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), R16_thread/*thread*/, exec_mode_reg/*exec_mode*/); __ reset_last_Java_frame(); // Restore the volatiles saved above. __ ld( R3_RET, _native_abi_reg_args_spill(spill_ret), R1_SP); __ lfd(F1_RET, _native_abi_reg_args_spill(spill_fret), R1_SP); // Pop the unpack frame. __ pop_frame(); __ restore_LR(R0); // stack: (top interpreter frame, ..., optional interpreter frame, // optional c2i, caller of deoptee, ...). // Initialize R14_state. __ restore_interpreter_state(R11_scratch1); __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1); // Return to the interpreter entry point. __ blr(); __ flush(); #else // COMPILER2 __ unimplemented("deopt blob needed only with compiler"); int exception_offset = __ pc() - start; #endif // COMPILER2 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, first_frame_size_in_bytes / wordSize); _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset); } #ifdef COMPILER2 UncommonTrapBlob* OptoRuntime::generate_uncommon_trap_blob() { // Allocate space for the code. ResourceMark rm; // Setup code generation tools. const char* name = OptoRuntime::stub_name(OptoStubId::uncommon_trap_id); CodeBuffer buffer(name, 2048, 1024); if (buffer.blob() == nullptr) { return nullptr; } InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer); address start = __ pc(); Register unroll_block_reg = R21_tmp1; Register klass_index_reg = R22_tmp2; Register unc_trap_reg = R23_tmp3; Register r_return_pc = R27_tmp7; OopMapSet* oop_maps = new OopMapSet(); int frame_size_in_bytes = frame::native_abi_reg_args_size; OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0); // stack: (deoptee, optional i2c, caller_of_deoptee, ...). // Push a dummy `unpack_frame' and call // `Deoptimization::uncommon_trap' to pack the compiled frame into a // vframe array and return the `UnrollBlock' information. // Save LR to compiled frame. __ save_LR(R11_scratch1); // Push an "uncommon_trap" frame. __ push_frame_reg_args(0, R11_scratch1); // stack: (unpack frame, deoptee, optional i2c, caller_of_deoptee, ...). // Set the `unpack_frame' as last_Java_frame. // `Deoptimization::uncommon_trap' expects it and considers its // sender frame as the deoptee frame. // Remember the offset of the instruction whose address will be // moved to R11_scratch1. address gc_map_pc = __ pc(); __ calculate_address_from_global_toc(r_return_pc, gc_map_pc, true, true, true, true); __ set_last_Java_frame(/*sp*/R1_SP, r_return_pc); __ mr(klass_index_reg, R3); __ li(R5_ARG3, Deoptimization::Unpack_uncommon_trap); __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap), R16_thread, klass_index_reg, R5_ARG3); // Set an oopmap for the call site. oop_maps->add_gc_map(gc_map_pc - start, map); __ reset_last_Java_frame(); // Pop the `unpack frame'. __ pop_frame(); // stack: (deoptee, optional i2c, caller_of_deoptee, ...). // Save the return value. __ mr(unroll_block_reg, R3_RET); // Pop the uncommon_trap frame. __ pop_frame(); // stack: (caller_of_deoptee, ...). #ifdef ASSERT __ lwz(R22_tmp2, in_bytes(Deoptimization::UnrollBlock::unpack_kind_offset()), unroll_block_reg); __ cmpdi(CR0, R22_tmp2, (unsigned)Deoptimization::Unpack_uncommon_trap); __ asm_assert_eq("OptoRuntime::generate_uncommon_trap_blob: expected Unpack_uncommon_trap"); #endif // Freezing continuation frames requires that the caller is trimmed to unextended sp if compiled. // If not compiled the loaded value is equal to the current SP (see frame::initial_deoptimization_info()) // and the frame is effectively not resized. Register caller_sp = R23_tmp3; __ ld_ptr(caller_sp, Deoptimization::UnrollBlock::initial_info_offset(), unroll_block_reg); __ resize_frame_absolute(caller_sp, R24_tmp4, R25_tmp5); // Allocate new interpreter frame(s) and possibly a c2i adapter // frame. push_skeleton_frames(masm, false/*deopt*/, unroll_block_reg, R22_tmp2, R23_tmp3, R24_tmp4, R25_tmp5, R26_tmp6); // stack: (skeletal interpreter frame, ..., optional skeletal // interpreter frame, optional c2i, caller of deoptee, ...). // Push a dummy `unpack_frame' taking care of float return values. // Call `Deoptimization::unpack_frames' to layout information in the // interpreter frames just created. // Push a simple "unpack frame" here. __ push_frame_reg_args(0, R11_scratch1); // stack: (unpack frame, skeletal interpreter frame, ..., optional // skeletal interpreter frame, optional c2i, caller of deoptee, // ...). // Set the "unpack_frame" as last_Java_frame. __ set_last_Java_frame(/*sp*/R1_SP, r_return_pc); // Indicate it is the uncommon trap case. __ li(unc_trap_reg, Deoptimization::Unpack_uncommon_trap); // Let the unpacker layout information in the skeletal frames just // allocated. __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), R16_thread, unc_trap_reg); __ reset_last_Java_frame(); // Pop the `unpack frame'. __ pop_frame(); // Restore LR from top interpreter frame. __ restore_LR(R11_scratch1); // stack: (top interpreter frame, ..., optional interpreter frame, // optional c2i, caller of deoptee, ...). __ restore_interpreter_state(R11_scratch1); __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1); // Return to the interpreter entry point. __ blr(); masm->flush(); return UncommonTrapBlob::create(&buffer, oop_maps, frame_size_in_bytes/wordSize); } #endif // COMPILER2 // Generate a special Compile2Runtime blob that saves all registers, and setup oopmap. SafepointBlob* SharedRuntime::generate_handler_blob(SharedStubId id, address call_ptr) { assert(StubRoutines::forward_exception_entry() != nullptr, "must be generated before"); assert(is_polling_page_id(id), "expected a polling page stub id"); ResourceMark rm; OopMapSet *oop_maps = new OopMapSet(); OopMap* map; // Allocate space for the code. Setup code generation tools. const char* name = SharedRuntime::stub_name(id); CodeBuffer buffer(name, 2048, 1024); MacroAssembler* masm = new MacroAssembler(&buffer); address start = __ pc(); int frame_size_in_bytes = 0; RegisterSaver::ReturnPCLocation return_pc_location; bool cause_return = (id == SharedStubId::polling_page_return_handler_id); if (cause_return) { // Nothing to do here. The frame has already been popped in MachEpilogNode. // Register LR already contains the return pc. return_pc_location = RegisterSaver::return_pc_is_pre_saved; } else { // Use thread()->saved_exception_pc() as return pc. return_pc_location = RegisterSaver::return_pc_is_thread_saved_exception_pc; } bool save_vectors = (id == SharedStubId::polling_page_vectors_safepoint_handler_id); // Save registers, fpu state, and flags. Set R31 = return pc. map = RegisterSaver::push_frame_reg_args_and_save_live_registers(masm, &frame_size_in_bytes, /*generate_oop_map=*/ true, /*return_pc_adjustment=*/0, return_pc_location, save_vectors); // The following is basically a call_VM. However, we need the precise // address of the call in order to generate an oopmap. Hence, we do all the // work ourselves. __ set_last_Java_frame(/*sp=*/R1_SP, /*pc=*/noreg); // The return address must always be correct so that the frame constructor // never sees an invalid pc. // Do the call __ call_VM_leaf(call_ptr, R16_thread); address calls_return_pc = __ last_calls_return_pc(); // Set an oopmap for the call site. This oopmap will map all // oop-registers and debug-info registers as callee-saved. This // will allow deoptimization at this safepoint to find all possible // debug-info recordings, as well as let GC find all oops. oop_maps->add_gc_map(calls_return_pc - start, map); Label noException; // Clear the last Java frame. __ reset_last_Java_frame(); BLOCK_COMMENT(" Check pending exception."); const Register pending_exception = R0; __ ld(pending_exception, thread_(pending_exception)); __ cmpdi(CR0, pending_exception, 0); __ beq(CR0, noException); // Exception pending RegisterSaver::restore_live_registers_and_pop_frame(masm, frame_size_in_bytes, /*restore_ctr=*/true, save_vectors); BLOCK_COMMENT(" Jump to forward_exception_entry."); // Jump to forward_exception_entry, with the issuing PC in LR // so it looks like the original nmethod called forward_exception_entry. __ b64_patchable(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type); // No exception case. __ BIND(noException); if (!cause_return) { Label no_adjust; // If our stashed return pc was modified by the runtime we avoid touching it __ ld(R0, frame_size_in_bytes + _abi0(lr), R1_SP); __ cmpd(CR0, R0, R31); __ bne(CR0, no_adjust); // Adjust return pc forward to step over the safepoint poll instruction __ addi(R31, R31, 4); __ std(R31, frame_size_in_bytes + _abi0(lr), R1_SP); __ bind(no_adjust); } // Normal exit, restore registers and exit. RegisterSaver::restore_live_registers_and_pop_frame(masm, frame_size_in_bytes, /*restore_ctr=*/true, save_vectors); __ blr(); // Make sure all code is generated masm->flush(); // Fill-out other meta info // CodeBlob frame size is in words. return SafepointBlob::create(&buffer, oop_maps, frame_size_in_bytes / wordSize); } // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss) // // Generate a stub that calls into the vm to find out the proper destination // of a java call. All the argument registers are live at this point // but since this is generic code we don't know what they are and the caller // must do any gc of the args. // RuntimeStub* SharedRuntime::generate_resolve_blob(SharedStubId id, address destination) { assert(is_resolve_id(id), "expected a resolve stub id"); // allocate space for the code ResourceMark rm; const char* name = SharedRuntime::stub_name(id); CodeBuffer buffer(name, 1000, 512); MacroAssembler* masm = new MacroAssembler(&buffer); int frame_size_in_bytes; OopMapSet *oop_maps = new OopMapSet(); OopMap* map = nullptr; address start = __ pc(); map = RegisterSaver::push_frame_reg_args_and_save_live_registers(masm, &frame_size_in_bytes, /*generate_oop_map*/ true, /*return_pc_adjustment*/ 0, RegisterSaver::return_pc_is_lr); // Use noreg as last_Java_pc, the return pc will be reconstructed // from the physical frame. __ set_last_Java_frame(/*sp*/R1_SP, noreg); int frame_complete = __ offset(); // Pass R19_method as 2nd (optional) argument, used by // counter_overflow_stub. __ call_VM_leaf(destination, R16_thread, R19_method); address calls_return_pc = __ last_calls_return_pc(); // Set an oopmap for the call site. // We need this not only for callee-saved registers, but also for volatile // registers that the compiler might be keeping live across a safepoint. // Create the oopmap for the call's return pc. oop_maps->add_gc_map(calls_return_pc - start, map); // R3_RET contains the address we are going to jump to assuming no exception got installed. // clear last_Java_sp __ reset_last_Java_frame(); // Check for pending exceptions. BLOCK_COMMENT("Check for pending exceptions."); Label pending; __ ld(R11_scratch1, thread_(pending_exception)); __ cmpdi(CR0, R11_scratch1, 0); __ bne(CR0, pending); __ mtctr(R3_RET); // Ctr will not be touched by restore_live_registers_and_pop_frame. RegisterSaver::restore_live_registers_and_pop_frame(masm, frame_size_in_bytes, /*restore_ctr*/ false); // Get the returned method. __ get_vm_result_metadata(R19_method); __ bctr(); // Pending exception after the safepoint. __ BIND(pending); RegisterSaver::restore_live_registers_and_pop_frame(masm, frame_size_in_bytes, /*restore_ctr*/ true); // exception pending => remove activation and forward to exception handler __ li(R11_scratch1, 0); __ ld(R3_ARG1, thread_(pending_exception)); __ std(R11_scratch1, in_bytes(JavaThread::vm_result_oop_offset()), R16_thread); __ b64_patchable(StubRoutines::forward_exception_entry(), relocInfo::runtime_call_type); // ------------- // Make sure all code is generated. masm->flush(); // return the blob // frame_size_words or bytes?? return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_bytes/wordSize, oop_maps, true); } // Continuation point for throwing of implicit exceptions that are // not handled in the current activation. Fabricates an exception // oop and initiates normal exception dispatching in this // frame. Only callee-saved registers are preserved (through the // normal register window / RegisterMap handling). If the compiler // needs all registers to be preserved between the fault point and // the exception handler then it must assume responsibility for that // in AbstractCompiler::continuation_for_implicit_null_exception or // continuation_for_implicit_division_by_zero_exception. All other // implicit exceptions (e.g., NullPointerException or // AbstractMethodError on entry) are either at call sites or // otherwise assume that stack unwinding will be initiated, so // caller saved registers were assumed volatile in the compiler. // // Note that we generate only this stub into a RuntimeStub, because // it needs to be properly traversed and ignored during GC, so we // change the meaning of the "__" macro within this method. // // Note: the routine set_pc_not_at_call_for_caller in // SharedRuntime.cpp requires that this code be generated into a // RuntimeStub. RuntimeStub* SharedRuntime::generate_throw_exception(SharedStubId id, address runtime_entry) { assert(is_throw_id(id), "expected a throw stub id"); const char* name = SharedRuntime::stub_name(id); ResourceMark rm; const char* timer_msg = "SharedRuntime generate_throw_exception"; TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime)); CodeBuffer code(name, 1024 DEBUG_ONLY(+ 512), 0); MacroAssembler* masm = new MacroAssembler(&code); OopMapSet* oop_maps = new OopMapSet(); int frame_size_in_bytes = frame::native_abi_reg_args_size; OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0); address start = __ pc(); __ save_LR(R11_scratch1); // Push a frame. __ push_frame_reg_args(0, R11_scratch1); address frame_complete_pc = __ pc(); // Note that we always have a runtime stub frame on the top of // stack by this point. Remember the offset of the instruction // whose address will be moved to R11_scratch1. address gc_map_pc = __ get_PC_trash_LR(R11_scratch1); __ set_last_Java_frame(/*sp*/R1_SP, /*pc*/R11_scratch1); __ mr(R3_ARG1, R16_thread); __ call_c(runtime_entry); // Set an oopmap for the call site. oop_maps->add_gc_map((int)(gc_map_pc - start), map); __ reset_last_Java_frame(); #ifdef ASSERT // Make sure that this code is only executed if there is a pending // exception. { Label L; __ ld(R0, in_bytes(Thread::pending_exception_offset()), R16_thread); __ cmpdi(CR0, R0, 0); __ bne(CR0, L); __ stop("SharedRuntime::throw_exception: no pending exception"); __ bind(L); } #endif // Pop frame. __ pop_frame(); __ restore_LR(R11_scratch1); __ load_const(R11_scratch1, StubRoutines::forward_exception_entry()); __ mtctr(R11_scratch1); __ bctr(); // Create runtime stub with OopMap. RuntimeStub* stub = RuntimeStub::new_runtime_stub(name, &code, /*frame_complete=*/ (int)(frame_complete_pc - start), frame_size_in_bytes/wordSize, oop_maps, false); return stub; } //------------------------------Montgomery multiplication------------------------ // // Subtract 0:b from carry:a. Return carry. static unsigned long sub(unsigned long a[], unsigned long b[], unsigned long carry, long len) { long i = 0; unsigned long tmp, tmp2; __asm__ __volatile__ ( "subfc %[tmp], %[tmp], %[tmp] \n" // pre-set CA "mtctr %[len] \n" "0: \n" "ldx %[tmp], %[i], %[a] \n" "ldx %[tmp2], %[i], %[b] \n" "subfe %[tmp], %[tmp2], %[tmp] \n" // subtract extended "stdx %[tmp], %[i], %[a] \n" "addi %[i], %[i], 8 \n" "bdnz 0b \n" "addme %[tmp], %[carry] \n" // carry + CA - 1 : [i]"+b"(i), [tmp]"=&r"(tmp), [tmp2]"=&r"(tmp2) : [a]"r"(a), [b]"r"(b), [carry]"r"(carry), [len]"r"(len) : "ctr", "xer", "memory" ); return tmp; } // Multiply (unsigned) Long A by Long B, accumulating the double- // length result into the accumulator formed of T0, T1, and T2. inline void MACC(unsigned long A, unsigned long B, unsigned long &T0, unsigned long &T1, unsigned long &T2) { unsigned long hi, lo; __asm__ __volatile__ ( "mulld %[lo], %[A], %[B] \n" "mulhdu %[hi], %[A], %[B] \n" "addc %[T0], %[T0], %[lo] \n" "adde %[T1], %[T1], %[hi] \n" "addze %[T2], %[T2] \n" : [hi]"=&r"(hi), [lo]"=&r"(lo), [T0]"+r"(T0), [T1]"+r"(T1), [T2]"+r"(T2) : [A]"r"(A), [B]"r"(B) : "xer" ); } // As above, but add twice the double-length result into the // accumulator. inline void MACC2(unsigned long A, unsigned long B, unsigned long &T0, unsigned long &T1, unsigned long &T2) { unsigned long hi, lo; __asm__ __volatile__ ( "mulld %[lo], %[A], %[B] \n" "mulhdu %[hi], %[A], %[B] \n" "addc %[T0], %[T0], %[lo] \n" "adde %[T1], %[T1], %[hi] \n" "addze %[T2], %[T2] \n" "addc %[T0], %[T0], %[lo] \n" "adde %[T1], %[T1], %[hi] \n" "addze %[T2], %[T2] \n" : [hi]"=&r"(hi), [lo]"=&r"(lo), [T0]"+r"(T0), [T1]"+r"(T1), [T2]"+r"(T2) : [A]"r"(A), [B]"r"(B) : "xer" ); } // Fast Montgomery multiplication. The derivation of the algorithm is // in "A Cryptographic Library for the Motorola DSP56000, // Dusse and Kaliski, Proc. EUROCRYPT 90, pp. 230-237". static void montgomery_multiply(unsigned long a[], unsigned long b[], unsigned long n[], unsigned long m[], unsigned long inv, int len) { unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator int i; assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply"); for (i = 0; i < len; i++) { int j; for (j = 0; j < i; j++) { MACC(a[j], b[i-j], t0, t1, t2); MACC(m[j], n[i-j], t0, t1, t2); } MACC(a[i], b[0], t0, t1, t2); m[i] = t0 * inv; MACC(m[i], n[0], t0, t1, t2); assert(t0 == 0, "broken Montgomery multiply"); t0 = t1; t1 = t2; t2 = 0; } for (i = len; i < 2*len; i++) { int j; for (j = i-len+1; j < len; j++) { MACC(a[j], b[i-j], t0, t1, t2); MACC(m[j], n[i-j], t0, t1, t2); } m[i-len] = t0; t0 = t1; t1 = t2; t2 = 0; } while (t0) { t0 = sub(m, n, t0, len); } } // Fast Montgomery squaring. This uses asymptotically 25% fewer // multiplies so it should be up to 25% faster than Montgomery // multiplication. However, its loop control is more complex and it // may actually run slower on some machines. static void montgomery_square(unsigned long a[], unsigned long n[], unsigned long m[], unsigned long inv, int len) { unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator int i; assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply"); for (i = 0; i < len; i++) { int j; int end = (i+1)/2; for (j = 0; j < end; j++) { MACC2(a[j], a[i-j], t0, t1, t2); MACC(m[j], n[i-j], t0, t1, t2); } if ((i & 1) == 0) { MACC(a[j], a[j], t0, t1, t2); } for (; j < i; j++) { MACC(m[j], n[i-j], t0, t1, t2); } m[i] = t0 * inv; MACC(m[i], n[0], t0, t1, t2); assert(t0 == 0, "broken Montgomery square"); t0 = t1; t1 = t2; t2 = 0; } for (i = len; i < 2*len; i++) { int start = i-len+1; int end = start + (len - start)/2; int j; for (j = start; j < end; j++) { MACC2(a[j], a[i-j], t0, t1, t2); MACC(m[j], n[i-j], t0, t1, t2); } if ((i & 1) == 0) { MACC(a[j], a[j], t0, t1, t2); } for (; j < len; j++) { MACC(m[j], n[i-j], t0, t1, t2); } m[i-len] = t0; t0 = t1; t1 = t2; t2 = 0; } while (t0) { t0 = sub(m, n, t0, len); } } // The threshold at which squaring is advantageous was determined // experimentally on an i7-3930K (Ivy Bridge) CPU @ 3.5GHz. // Doesn't seem to be relevant for Power8 so we use the same value. #define MONTGOMERY_SQUARING_THRESHOLD 64 // Copy len longwords from s to d, word-swapping as we go. The // destination array is reversed. static void reverse_words(unsigned long *s, unsigned long *d, int len) { d += len; while(len-- > 0) { d--; unsigned long s_val = *s; // Swap words in a longword on little endian machines. #ifdef VM_LITTLE_ENDIAN s_val = (s_val << 32) | (s_val >> 32); #endif *d = s_val; s++; } } void SharedRuntime::montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, jint len, jlong inv, jint *m_ints) { len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls. assert(len % 2 == 0, "array length in montgomery_multiply must be even"); int longwords = len/2; // Make very sure we don't use so much space that the stack might // overflow. 512 jints corresponds to an 16384-bit integer and // will use here a total of 8k bytes of stack space. int divisor = sizeof(unsigned long) * 4; guarantee(longwords <= 8192 / divisor, "must be"); int total_allocation = longwords * sizeof (unsigned long) * 4; unsigned long *scratch = (unsigned long *)alloca(total_allocation); // Local scratch arrays unsigned long *a = scratch + 0 * longwords, *b = scratch + 1 * longwords, *n = scratch + 2 * longwords, *m = scratch + 3 * longwords; reverse_words((unsigned long *)a_ints, a, longwords); reverse_words((unsigned long *)b_ints, b, longwords); reverse_words((unsigned long *)n_ints, n, longwords); ::montgomery_multiply(a, b, n, m, (unsigned long)inv, longwords); reverse_words(m, (unsigned long *)m_ints, longwords); } void SharedRuntime::montgomery_square(jint *a_ints, jint *n_ints, jint len, jlong inv, jint *m_ints) { len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls. assert(len % 2 == 0, "array length in montgomery_square must be even"); int longwords = len/2; // Make very sure we don't use so much space that the stack might // overflow. 512 jints corresponds to an 16384-bit integer and // will use here a total of 6k bytes of stack space. int divisor = sizeof(unsigned long) * 3; guarantee(longwords <= (8192 / divisor), "must be"); int total_allocation = longwords * sizeof (unsigned long) * 3; unsigned long *scratch = (unsigned long *)alloca(total_allocation); // Local scratch arrays unsigned long *a = scratch + 0 * longwords, *n = scratch + 1 * longwords, *m = scratch + 2 * longwords; reverse_words((unsigned long *)a_ints, a, longwords); reverse_words((unsigned long *)n_ints, n, longwords); if (len >= MONTGOMERY_SQUARING_THRESHOLD) { ::montgomery_square(a, n, m, (unsigned long)inv, longwords); } else { ::montgomery_multiply(a, a, n, m, (unsigned long)inv, longwords); } reverse_words(m, (unsigned long *)m_ints, longwords); } #if INCLUDE_JFR // For c2: c_rarg0 is junk, call to runtime to write a checkpoint. // It returns a jobject handle to the event writer. // The handle is dereferenced and the return value is the event writer oop. RuntimeStub* SharedRuntime::generate_jfr_write_checkpoint() { const char* name = SharedRuntime::stub_name(SharedStubId::jfr_write_checkpoint_id); CodeBuffer code(name, 512, 64); MacroAssembler* masm = new MacroAssembler(&code); Register tmp1 = R10_ARG8; Register tmp2 = R9_ARG7; int framesize = frame::native_abi_reg_args_size / VMRegImpl::stack_slot_size; address start = __ pc(); __ mflr(tmp1); __ std(tmp1, _abi0(lr), R1_SP); // save return pc __ push_frame_reg_args(0, tmp1); int frame_complete = __ pc() - start; __ set_last_Java_frame(R1_SP, noreg); __ call_VM_leaf(CAST_FROM_FN_PTR(address, JfrIntrinsicSupport::write_checkpoint), R16_thread); address calls_return_pc = __ last_calls_return_pc(); __ reset_last_Java_frame(); // The handle is dereferenced through a load barrier. __ resolve_global_jobject(R3_RET, tmp1, tmp2, MacroAssembler::PRESERVATION_NONE); __ pop_frame(); __ ld(tmp1, _abi0(lr), R1_SP); __ mtlr(tmp1); __ blr(); OopMapSet* oop_maps = new OopMapSet(); OopMap* map = new OopMap(framesize, 0); oop_maps->add_gc_map(calls_return_pc - start, map); RuntimeStub* stub = // codeBlob framesize is in words (not VMRegImpl::slot_size) RuntimeStub::new_runtime_stub(name, &code, frame_complete, (framesize >> (LogBytesPerWord - LogBytesPerInt)), oop_maps, false); return stub; } // For c2: call to return a leased buffer. RuntimeStub* SharedRuntime::generate_jfr_return_lease() { const char* name = SharedRuntime::stub_name(SharedStubId::jfr_return_lease_id); CodeBuffer code(name, 512, 64); MacroAssembler* masm = new MacroAssembler(&code); Register tmp1 = R10_ARG8; Register tmp2 = R9_ARG7; int framesize = frame::native_abi_reg_args_size / VMRegImpl::stack_slot_size; address start = __ pc(); __ mflr(tmp1); __ std(tmp1, _abi0(lr), R1_SP); // save return pc __ push_frame_reg_args(0, tmp1); int frame_complete = __ pc() - start; __ set_last_Java_frame(R1_SP, noreg); __ call_VM_leaf(CAST_FROM_FN_PTR(address, JfrIntrinsicSupport::return_lease), R16_thread); address calls_return_pc = __ last_calls_return_pc(); __ reset_last_Java_frame(); __ pop_frame(); __ ld(tmp1, _abi0(lr), R1_SP); __ mtlr(tmp1); __ blr(); OopMapSet* oop_maps = new OopMapSet(); OopMap* map = new OopMap(framesize, 0); oop_maps->add_gc_map(calls_return_pc - start, map); RuntimeStub* stub = // codeBlob framesize is in words (not VMRegImpl::slot_size) RuntimeStub::new_runtime_stub(name, &code, frame_complete, (framesize >> (LogBytesPerWord - LogBytesPerInt)), oop_maps, false); return stub; } #endif // INCLUDE_JFR