| /* |
| * Copyright (C) 2013-2018 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| |
| #if ENABLE(ASSEMBLER) && (CPU(X86) || CPU(X86_64)) |
| #include "MacroAssembler.h" |
| |
| #include "ProbeContext.h" |
| #include <wtf/InlineASM.h> |
| |
| #if COMPILER(MSVC) |
| #include <intrin.h> |
| #endif |
| |
| namespace JSC { |
| |
| #if ENABLE(MASM_PROBE) |
| |
| extern "C" void ctiMasmProbeTrampoline(); |
| |
| // The following are offsets for Probe::State fields accessed by the ctiMasmProbeTrampoline stub. |
| |
| #if CPU(X86) |
| #define PTR_SIZE 4 |
| #else // CPU(X86_64) |
| #define PTR_SIZE 8 |
| #endif |
| |
| #define PROBE_PROBE_FUNCTION_OFFSET (0 * PTR_SIZE) |
| #define PROBE_ARG_OFFSET (1 * PTR_SIZE) |
| #define PROBE_INIT_STACK_FUNCTION_OFFSET (2 * PTR_SIZE) |
| #define PROBE_INIT_STACK_ARG_OFFSET (3 * PTR_SIZE) |
| |
| #define PROBE_FIRST_GPR_OFFSET (4 * PTR_SIZE) |
| #define PROBE_CPU_EAX_OFFSET (PROBE_FIRST_GPR_OFFSET + (0 * PTR_SIZE)) |
| #define PROBE_CPU_ECX_OFFSET (PROBE_FIRST_GPR_OFFSET + (1 * PTR_SIZE)) |
| #define PROBE_CPU_EDX_OFFSET (PROBE_FIRST_GPR_OFFSET + (2 * PTR_SIZE)) |
| #define PROBE_CPU_EBX_OFFSET (PROBE_FIRST_GPR_OFFSET + (3 * PTR_SIZE)) |
| #define PROBE_CPU_ESP_OFFSET (PROBE_FIRST_GPR_OFFSET + (4 * PTR_SIZE)) |
| #define PROBE_CPU_EBP_OFFSET (PROBE_FIRST_GPR_OFFSET + (5 * PTR_SIZE)) |
| #define PROBE_CPU_ESI_OFFSET (PROBE_FIRST_GPR_OFFSET + (6 * PTR_SIZE)) |
| #define PROBE_CPU_EDI_OFFSET (PROBE_FIRST_GPR_OFFSET + (7 * PTR_SIZE)) |
| |
| #if CPU(X86) |
| #define PROBE_FIRST_SPR_OFFSET (PROBE_FIRST_GPR_OFFSET + (8 * PTR_SIZE)) |
| #else // CPU(X86_64) |
| #define PROBE_CPU_R8_OFFSET (PROBE_FIRST_GPR_OFFSET + (8 * PTR_SIZE)) |
| #define PROBE_CPU_R9_OFFSET (PROBE_FIRST_GPR_OFFSET + (9 * PTR_SIZE)) |
| #define PROBE_CPU_R10_OFFSET (PROBE_FIRST_GPR_OFFSET + (10 * PTR_SIZE)) |
| #define PROBE_CPU_R11_OFFSET (PROBE_FIRST_GPR_OFFSET + (11 * PTR_SIZE)) |
| #define PROBE_CPU_R12_OFFSET (PROBE_FIRST_GPR_OFFSET + (12 * PTR_SIZE)) |
| #define PROBE_CPU_R13_OFFSET (PROBE_FIRST_GPR_OFFSET + (13 * PTR_SIZE)) |
| #define PROBE_CPU_R14_OFFSET (PROBE_FIRST_GPR_OFFSET + (14 * PTR_SIZE)) |
| #define PROBE_CPU_R15_OFFSET (PROBE_FIRST_GPR_OFFSET + (15 * PTR_SIZE)) |
| #define PROBE_FIRST_SPR_OFFSET (PROBE_FIRST_GPR_OFFSET + (16 * PTR_SIZE)) |
| #endif // CPU(X86_64) |
| |
| #define PROBE_CPU_EIP_OFFSET (PROBE_FIRST_SPR_OFFSET + (0 * PTR_SIZE)) |
| #define PROBE_CPU_EFLAGS_OFFSET (PROBE_FIRST_SPR_OFFSET + (1 * PTR_SIZE)) |
| #define PROBE_FIRST_XMM_OFFSET (PROBE_FIRST_SPR_OFFSET + (2 * PTR_SIZE)) |
| |
| #define XMM_SIZE 8 |
| #define PROBE_CPU_XMM0_OFFSET (PROBE_FIRST_XMM_OFFSET + (0 * XMM_SIZE)) |
| #define PROBE_CPU_XMM1_OFFSET (PROBE_FIRST_XMM_OFFSET + (1 * XMM_SIZE)) |
| #define PROBE_CPU_XMM2_OFFSET (PROBE_FIRST_XMM_OFFSET + (2 * XMM_SIZE)) |
| #define PROBE_CPU_XMM3_OFFSET (PROBE_FIRST_XMM_OFFSET + (3 * XMM_SIZE)) |
| #define PROBE_CPU_XMM4_OFFSET (PROBE_FIRST_XMM_OFFSET + (4 * XMM_SIZE)) |
| #define PROBE_CPU_XMM5_OFFSET (PROBE_FIRST_XMM_OFFSET + (5 * XMM_SIZE)) |
| #define PROBE_CPU_XMM6_OFFSET (PROBE_FIRST_XMM_OFFSET + (6 * XMM_SIZE)) |
| #define PROBE_CPU_XMM7_OFFSET (PROBE_FIRST_XMM_OFFSET + (7 * XMM_SIZE)) |
| |
| #if CPU(X86) |
| #define PROBE_SIZE (PROBE_CPU_XMM7_OFFSET + XMM_SIZE) |
| #else // CPU(X86_64) |
| #define PROBE_CPU_XMM8_OFFSET (PROBE_FIRST_XMM_OFFSET + (8 * XMM_SIZE)) |
| #define PROBE_CPU_XMM9_OFFSET (PROBE_FIRST_XMM_OFFSET + (9 * XMM_SIZE)) |
| #define PROBE_CPU_XMM10_OFFSET (PROBE_FIRST_XMM_OFFSET + (10 * XMM_SIZE)) |
| #define PROBE_CPU_XMM11_OFFSET (PROBE_FIRST_XMM_OFFSET + (11 * XMM_SIZE)) |
| #define PROBE_CPU_XMM12_OFFSET (PROBE_FIRST_XMM_OFFSET + (12 * XMM_SIZE)) |
| #define PROBE_CPU_XMM13_OFFSET (PROBE_FIRST_XMM_OFFSET + (13 * XMM_SIZE)) |
| #define PROBE_CPU_XMM14_OFFSET (PROBE_FIRST_XMM_OFFSET + (14 * XMM_SIZE)) |
| #define PROBE_CPU_XMM15_OFFSET (PROBE_FIRST_XMM_OFFSET + (15 * XMM_SIZE)) |
| #define PROBE_SIZE (PROBE_CPU_XMM15_OFFSET + XMM_SIZE) |
| #endif // CPU(X86_64) |
| |
| #define PROBE_EXECUTOR_OFFSET PROBE_SIZE // Stash the executeProbe function pointer at the end of the ProbeContext. |
| |
| // The outgoing record to be popped off the stack at the end consists of: |
| // eflags, eax, ecx, ebp, eip. |
| #define OUT_SIZE (5 * PTR_SIZE) |
| |
| // These ASSERTs remind you that if you change the layout of Probe::State, |
| // you need to change ctiMasmProbeTrampoline offsets above to match. |
| #define PROBE_OFFSETOF(x) offsetof(struct Probe::State, x) |
| #define PROBE_OFFSETOF_REG(x, reg) offsetof(struct Probe::State, x) + reg * sizeof((reinterpret_cast<Probe::State*>(0))->x[reg]) |
| static_assert(PROBE_OFFSETOF(probeFunction) == PROBE_PROBE_FUNCTION_OFFSET, "Probe::State::probeFunction's offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF(arg) == PROBE_ARG_OFFSET, "Probe::State::arg's offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF(initializeStackFunction) == PROBE_INIT_STACK_FUNCTION_OFFSET, "Probe::State::initializeStackFunction's offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF(initializeStackArg) == PROBE_INIT_STACK_ARG_OFFSET, "Probe::State::initializeStackArg's offset matches ctiMasmProbeTrampoline"); |
| |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::eax) == PROBE_CPU_EAX_OFFSET, "Probe::State::cpu.gprs[eax]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::ecx) == PROBE_CPU_ECX_OFFSET, "Probe::State::cpu.gprs[ecx]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::edx) == PROBE_CPU_EDX_OFFSET, "Probe::State::cpu.gprs[edx]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::ebx) == PROBE_CPU_EBX_OFFSET, "Probe::State::cpu.gprs[ebx]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::esp) == PROBE_CPU_ESP_OFFSET, "Probe::State::cpu.gprs[esp]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::ebp) == PROBE_CPU_EBP_OFFSET, "Probe::State::cpu.gprs[ebp]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::esi) == PROBE_CPU_ESI_OFFSET, "Probe::State::cpu.gprs[esi]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::edi) == PROBE_CPU_EDI_OFFSET, "Probe::State::cpu.gprs[edi]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.sprs, X86Registers::eip) == PROBE_CPU_EIP_OFFSET, "Probe::State::cpu.gprs[eip]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.sprs, X86Registers::eflags) == PROBE_CPU_EFLAGS_OFFSET, "Probe::State::cpu.sprs[eflags]'s offset matches ctiMasmProbeTrampoline"); |
| |
| #if CPU(X86_64) |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r8) == PROBE_CPU_R8_OFFSET, "Probe::State::cpu.gprs[r8]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r9) == PROBE_CPU_R9_OFFSET, "Probe::State::cpu.gprs[r9]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r10) == PROBE_CPU_R10_OFFSET, "Probe::State::cpu.gprs[r10]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r11) == PROBE_CPU_R11_OFFSET, "Probe::State::cpu.gprs[r11]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r12) == PROBE_CPU_R12_OFFSET, "Probe::State::cpu.gprs[r12]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r13) == PROBE_CPU_R13_OFFSET, "Probe::State::cpu.gprs[r13]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r14) == PROBE_CPU_R14_OFFSET, "Probe::State::cpu.gprs[r14]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.gprs, X86Registers::r15) == PROBE_CPU_R15_OFFSET, "Probe::State::cpu.gprs[r15]'s offset matches ctiMasmProbeTrampoline"); |
| #endif // CPU(X86_64) |
| |
| static_assert(!(PROBE_CPU_XMM0_OFFSET & 0x7), "Probe::State::cpu.fprs[xmm0]'s offset should be 8 byte aligned"); |
| |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm0) == PROBE_CPU_XMM0_OFFSET, "Probe::State::cpu.fprs[xmm0]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm1) == PROBE_CPU_XMM1_OFFSET, "Probe::State::cpu.fprs[xmm1]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm2) == PROBE_CPU_XMM2_OFFSET, "Probe::State::cpu.fprs[xmm2]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm3) == PROBE_CPU_XMM3_OFFSET, "Probe::State::cpu.fprs[xmm3]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm4) == PROBE_CPU_XMM4_OFFSET, "Probe::State::cpu.fprs[xmm4]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm5) == PROBE_CPU_XMM5_OFFSET, "Probe::State::cpu.fprs[xmm5]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm6) == PROBE_CPU_XMM6_OFFSET, "Probe::State::cpu.fprs[xmm6]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm7) == PROBE_CPU_XMM7_OFFSET, "Probe::State::cpu.fprs[xmm7]'s offset matches ctiMasmProbeTrampoline"); |
| |
| #if CPU(X86_64) |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm8) == PROBE_CPU_XMM8_OFFSET, "Probe::State::cpu.fprs[xmm8]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm9) == PROBE_CPU_XMM9_OFFSET, "Probe::State::cpu.fprs[xmm9]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm10) == PROBE_CPU_XMM10_OFFSET, "Probe::State::cpu.fprs[xmm10]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm11) == PROBE_CPU_XMM11_OFFSET, "Probe::State::cpu.fprs[xmm11]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm12) == PROBE_CPU_XMM12_OFFSET, "Probe::State::cpu.fprs[xmm12]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm13) == PROBE_CPU_XMM13_OFFSET, "Probe::State::cpu.fprs[xmm13]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm14) == PROBE_CPU_XMM14_OFFSET, "Probe::State::cpu.fprs[xmm14]'s offset matches ctiMasmProbeTrampoline"); |
| static_assert(PROBE_OFFSETOF_REG(cpu.fprs, X86Registers::xmm15) == PROBE_CPU_XMM15_OFFSET, "Probe::State::cpu.fprs[xmm15]'s offset matches ctiMasmProbeTrampoline"); |
| #endif // CPU(X86_64) |
| |
| static_assert(sizeof(Probe::State) == PROBE_SIZE, "Probe::State::size's matches ctiMasmProbeTrampoline"); |
| static_assert((PROBE_EXECUTOR_OFFSET + PTR_SIZE) <= (PROBE_SIZE + OUT_SIZE), "Must have room after ProbeContext to stash the probe handler"); |
| |
| #undef PROBE_OFFSETOF |
| |
| #if CPU(X86) |
| #if COMPILER(GCC_COMPATIBLE) |
| asm ( |
| ".globl " SYMBOL_STRING(ctiMasmProbeTrampoline) "\n" |
| HIDE_SYMBOL(ctiMasmProbeTrampoline) "\n" |
| SYMBOL_STRING(ctiMasmProbeTrampoline) ":" "\n" |
| |
| "pushfl" "\n" |
| |
| // MacroAssemblerX86Common::probe() has already generated code to store some values. |
| // Together with the eflags pushed above, the top of stack now looks like |
| // this: |
| // esp[0 * ptrSize]: eflags |
| // esp[1 * ptrSize]: return address / saved eip |
| // esp[2 * ptrSize]: saved ebx |
| // esp[3 * ptrSize]: saved edx |
| // esp[4 * ptrSize]: saved ecx |
| // esp[5 * ptrSize]: saved eax |
| // |
| // Incoming registers contain: |
| // ecx: Probe::executeProbe |
| // edx: probe function |
| // ebx: probe arg |
| // eax: scratch (was ctiMasmProbeTrampoline) |
| |
| "movl %esp, %eax" "\n" |
| "subl $" STRINGIZE_VALUE_OF(PROBE_SIZE + OUT_SIZE) ", %esp" "\n" |
| |
| // The X86_64 ABI specifies that the worse case stack alignment requirement is 32 bytes. |
| "andl $~0x1f, %esp" "\n" |
| |
| "movl %ebp, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%esp)" "\n" |
| "movl %esp, %ebp" "\n" // Save the Probe::State*. |
| |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_EXECUTOR_OFFSET) "(%ebp)" "\n" |
| "movl %edx, " STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "(%ebp)" "\n" |
| "movl %ebx, " STRINGIZE_VALUE_OF(PROBE_ARG_OFFSET) "(%ebp)" "\n" |
| "movl %esi, " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%ebp)" "\n" |
| "movl %edi, " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%ebp)" "\n" |
| |
| "movl 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%eax), %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%ebp)" "\n" |
| "movl 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%eax), %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%ebp)" "\n" |
| "movl 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%eax), %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%ebp)" "\n" |
| "movl 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%eax), %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%ebp)" "\n" |
| "movl 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%eax), %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%ebp)" "\n" |
| "movl 5 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%eax), %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%ebp)" "\n" |
| |
| "movl %eax, %ecx" "\n" |
| "addl $" STRINGIZE_VALUE_OF(6 * PTR_SIZE) ", %ecx" "\n" |
| "movl %ecx, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%ebp)" "\n" |
| |
| "movq %xmm0, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%ebp)" "\n" |
| "movq %xmm1, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%ebp)" "\n" |
| "movq %xmm2, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%ebp)" "\n" |
| "movq %xmm3, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%ebp)" "\n" |
| "movq %xmm4, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%ebp)" "\n" |
| "movq %xmm5, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%ebp)" "\n" |
| "movq %xmm6, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%ebp)" "\n" |
| "movq %xmm7, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%ebp)" "\n" |
| |
| // Reserve stack space for the arg while maintaining the required stack |
| // pointer 32 byte alignment: |
| "subl $0x20, %esp" "\n" |
| "movl %ebp, 0(%esp)" "\n" // the Probe::State* arg. |
| |
| "call *" STRINGIZE_VALUE_OF(PROBE_EXECUTOR_OFFSET) "(%ebp)" "\n" |
| |
| // Make sure the Probe::State is entirely below the result stack pointer so |
| // that register values are still preserved when we call the initializeStack |
| // function. |
| "movl $" STRINGIZE_VALUE_OF(PROBE_SIZE + OUT_SIZE) ", %ecx" "\n" |
| "movl %ebp, %eax" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%ebp), %edx" "\n" |
| "addl %ecx, %eax" "\n" |
| "cmpl %eax, %edx" "\n" |
| "jge " LOCAL_LABEL_STRING(ctiMasmProbeTrampolineProbeStateIsSafe) "\n" |
| |
| // Allocate a safe place on the stack below the result stack pointer to stash the Probe::State. |
| "subl %ecx, %edx" "\n" |
| "andl $~0x1f, %edx" "\n" // Keep the stack pointer 32 bytes aligned. |
| "xorl %eax, %eax" "\n" |
| "movl %edx, %esp" "\n" |
| |
| "movl $" STRINGIZE_VALUE_OF(PROBE_SIZE) ", %ecx" "\n" |
| |
| // Copy the Probe::State to the safe place. |
| LOCAL_LABEL_STRING(ctiMasmProbeTrampolineCopyLoop) ":" "\n" |
| "movl (%ebp, %eax), %edx" "\n" |
| "movl %edx, (%esp, %eax)" "\n" |
| "addl $" STRINGIZE_VALUE_OF(PTR_SIZE) ", %eax" "\n" |
| "cmpl %eax, %ecx" "\n" |
| "jg " LOCAL_LABEL_STRING(ctiMasmProbeTrampolineCopyLoop) "\n" |
| |
| "movl %esp, %ebp" "\n" |
| |
| // Call initializeStackFunction if present. |
| LOCAL_LABEL_STRING(ctiMasmProbeTrampolineProbeStateIsSafe) ":" "\n" |
| "xorl %ecx, %ecx" "\n" |
| "addl " STRINGIZE_VALUE_OF(PROBE_INIT_STACK_FUNCTION_OFFSET) "(%ebp), %ecx" "\n" |
| "je " LOCAL_LABEL_STRING(ctiMasmProbeTrampolineRestoreRegisters) "\n" |
| |
| // Reserve stack space for the arg while maintaining the required stack |
| // pointer 32 byte alignment: |
| "subl $0x20, %esp" "\n" |
| "movl %ebp, 0(%esp)" "\n" // the Probe::State* arg. |
| "call *%ecx" "\n" |
| |
| LOCAL_LABEL_STRING(ctiMasmProbeTrampolineRestoreRegisters) ":" "\n" |
| |
| // To enable probes to modify register state, we copy all registers |
| // out of the Probe::State before returning. |
| |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%ebp), %edx" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%ebp), %ebx" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%ebp), %esi" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%ebp), %edi" "\n" |
| |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%ebp), %xmm0" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%ebp), %xmm1" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%ebp), %xmm2" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%ebp), %xmm3" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%ebp), %xmm4" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%ebp), %xmm5" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%ebp), %xmm6" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%ebp), %xmm7" "\n" |
| |
| // There are 6 more registers left to restore: |
| // eax, ecx, ebp, esp, eip, and eflags. |
| |
| // The restoration process at ctiMasmProbeTrampolineEnd below works by popping |
| // 5 words off the stack into eflags, eax, ecx, ebp, and eip. These 5 words need |
| // to be pushed on top of the final esp value so that just by popping the 5 words, |
| // we'll get the esp that the probe wants to set. Let's call this area (for storing |
| // these 5 words) the restore area. |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%ebp), %ecx" "\n" |
| "subl $5 * " STRINGIZE_VALUE_OF(PTR_SIZE) ", %ecx" "\n" |
| |
| // ecx now points to the restore area. |
| |
| // Copy remaining restore values from the Probe::State to the restore area. |
| // Note: We already ensured above that the Probe::State is in a safe location before |
| // calling the initializeStackFunction. The initializeStackFunction is not allowed to |
| // change the stack pointer again. |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%ebp), %eax" "\n" |
| "movl %eax, 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%ecx)" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%ebp), %eax" "\n" |
| "movl %eax, 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%ecx)" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%ebp), %eax" "\n" |
| "movl %eax, 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%ecx)" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%ebp), %eax" "\n" |
| "movl %eax, 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%ecx)" "\n" |
| "movl " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%ebp), %eax" "\n" |
| "movl %eax, 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%ecx)" "\n" |
| "movl %ecx, %esp" "\n" |
| |
| // Do the remaining restoration by popping off the restore area. |
| "popfl" "\n" |
| "popl %eax" "\n" |
| "popl %ecx" "\n" |
| "popl %ebp" "\n" |
| "ret" "\n" |
| ); |
| #endif |
| |
| #if COMPILER(MSVC) |
| extern "C" __declspec(naked) void ctiMasmProbeTrampoline() |
| { |
| __asm { |
| pushfd; |
| |
| // MacroAssemblerX86Common::probe() has already generated code to store some values. |
| // Together with the eflags pushed above, the top of stack now looks like |
| // this: |
| // esp[0 * ptrSize]: eflags |
| // esp[1 * ptrSize]: return address / saved eip |
| // esp[2 * ptrSize]: saved ebx |
| // esp[3 * ptrSize]: saved edx |
| // esp[4 * ptrSize]: saved ecx |
| // esp[5 * ptrSize]: saved eax |
| // |
| // Incoming registers contain: |
| // ecx: Probe::executeProbe |
| // edx: probe function |
| // ebx: probe arg |
| // eax: scratch (was ctiMasmProbeTrampoline) |
| |
| mov eax, esp |
| sub esp, PROBE_SIZE + OUT_SIZE |
| |
| // The X86_64 ABI specifies that the worse case stack alignment requirement is 32 bytes. |
| and esp, ~0x1f |
| |
| mov [PROBE_CPU_EBP_OFFSET + esp], ebp |
| mov ebp, esp // Save the ProbeContext*. |
| |
| mov [PROBE_EXECUTOR_OFFSET + ebp], ecx |
| mov [PROBE_PROBE_FUNCTION_OFFSET + ebp], edx |
| mov [PROBE_ARG_OFFSET + ebp], ebx |
| mov [PROBE_CPU_ESI_OFFSET + ebp], esi |
| mov [PROBE_CPU_EDI_OFFSET + ebp], edi |
| |
| mov ecx, [0 * PTR_SIZE + eax] |
| mov [PROBE_CPU_EFLAGS_OFFSET + ebp], ecx |
| mov ecx, [1 * PTR_SIZE + eax] |
| mov [PROBE_CPU_EIP_OFFSET + ebp], ecx |
| mov ecx, [2 * PTR_SIZE + eax] |
| mov [PROBE_CPU_EBX_OFFSET + ebp], ecx |
| mov ecx, [3 * PTR_SIZE + eax] |
| mov [PROBE_CPU_EDX_OFFSET + ebp], ecx |
| mov ecx, [4 * PTR_SIZE + eax] |
| mov [PROBE_CPU_ECX_OFFSET + ebp], ecx |
| mov ecx, [5 * PTR_SIZE + eax] |
| mov [PROBE_CPU_EAX_OFFSET + ebp], ecx |
| |
| mov ecx, eax |
| add ecx, 6 * PTR_SIZE |
| mov [PROBE_CPU_ESP_OFFSET + ebp], ecx |
| |
| movq qword ptr[PROBE_CPU_XMM0_OFFSET + ebp], xmm0 |
| movq qword ptr[PROBE_CPU_XMM1_OFFSET + ebp], xmm1 |
| movq qword ptr[PROBE_CPU_XMM2_OFFSET + ebp], xmm2 |
| movq qword ptr[PROBE_CPU_XMM3_OFFSET + ebp], xmm3 |
| movq qword ptr[PROBE_CPU_XMM4_OFFSET + ebp], xmm4 |
| movq qword ptr[PROBE_CPU_XMM5_OFFSET + ebp], xmm5 |
| movq qword ptr[PROBE_CPU_XMM6_OFFSET + ebp], xmm6 |
| movq qword ptr[PROBE_CPU_XMM7_OFFSET + ebp], xmm7 |
| |
| // Reserve stack space for the arg while maintaining the required stack |
| // pointer 32 byte alignment: |
| sub esp, 0x20 |
| mov [0 + esp], ebp // the ProbeContext* arg. |
| |
| call [PROBE_EXECUTOR_OFFSET + ebp] |
| |
| // Make sure the ProbeContext is entirely below the result stack pointer so |
| // that register values are still preserved when we call the initializeStack |
| // function. |
| mov ecx, PROBE_SIZE + OUT_SIZE |
| mov eax, ebp |
| mov edx, [PROBE_CPU_ESP_OFFSET + ebp] |
| add eax, ecx |
| cmp edx, eax |
| jge ctiMasmProbeTrampolineProbeContextIsSafe |
| |
| // Allocate a safe place on the stack below the result stack pointer to stash the ProbeContext. |
| sub edx, ecx |
| and edx, ~0x1f // Keep the stack pointer 32 bytes aligned. |
| xor eax, eax |
| mov esp, edx |
| |
| mov ecx, PROBE_SIZE |
| |
| // Copy the ProbeContext to the safe place. |
| ctiMasmProbeTrampolineCopyLoop : |
| mov edx, [ebp + eax] |
| mov [esp + eax], edx |
| add eax, PTR_SIZE |
| cmp ecx, eax |
| jg ctiMasmProbeTrampolineCopyLoop |
| |
| mov ebp, esp |
| |
| // Call initializeStackFunction if present. |
| ctiMasmProbeTrampolineProbeContextIsSafe : |
| xor ecx, ecx |
| add ecx, [PROBE_INIT_STACK_FUNCTION_OFFSET + ebp] |
| je ctiMasmProbeTrampolineRestoreRegisters |
| |
| // Reserve stack space for the arg while maintaining the required stack |
| // pointer 32 byte alignment: |
| sub esp, 0x20 |
| mov [0 + esp], ebp // the ProbeContext* arg. |
| call ecx |
| |
| ctiMasmProbeTrampolineRestoreRegisters : |
| |
| // To enable probes to modify register state, we copy all registers |
| // out of the ProbeContext before returning. |
| |
| mov edx, [PROBE_CPU_EDX_OFFSET + ebp] |
| mov ebx, [PROBE_CPU_EBX_OFFSET + ebp] |
| mov esi, [PROBE_CPU_ESI_OFFSET + ebp] |
| mov edi, [PROBE_CPU_EDI_OFFSET + ebp] |
| |
| movq xmm0, qword ptr[PROBE_CPU_XMM0_OFFSET + ebp] |
| movq xmm1, qword ptr[PROBE_CPU_XMM1_OFFSET + ebp] |
| movq xmm2, qword ptr[PROBE_CPU_XMM2_OFFSET + ebp] |
| movq xmm3, qword ptr[PROBE_CPU_XMM3_OFFSET + ebp] |
| movq xmm4, qword ptr[PROBE_CPU_XMM4_OFFSET + ebp] |
| movq xmm5, qword ptr[PROBE_CPU_XMM5_OFFSET + ebp] |
| movq xmm6, qword ptr[PROBE_CPU_XMM6_OFFSET + ebp] |
| movq xmm7, qword ptr[PROBE_CPU_XMM7_OFFSET + ebp] |
| |
| // There are 6 more registers left to restore: |
| // eax, ecx, ebp, esp, eip, and eflags. |
| |
| // The restoration process at ctiMasmProbeTrampolineEnd below works by popping |
| // 5 words off the stack into eflags, eax, ecx, ebp, and eip. These 5 words need |
| // to be pushed on top of the final esp value so that just by popping the 5 words, |
| // we'll get the esp that the probe wants to set. Let's call this area (for storing |
| // these 5 words) the restore area. |
| mov ecx, [PROBE_CPU_ESP_OFFSET + ebp] |
| sub ecx, 5 * PTR_SIZE |
| |
| // ecx now points to the restore area. |
| |
| // Copy remaining restore values from the ProbeContext to the restore area. |
| // Note: We already ensured above that the ProbeContext is in a safe location before |
| // calling the initializeStackFunction. The initializeStackFunction is not allowed to |
| // change the stack pointer again. |
| mov eax, [PROBE_CPU_EFLAGS_OFFSET + ebp] |
| mov [0 * PTR_SIZE + ecx], eax |
| mov eax, [PROBE_CPU_EAX_OFFSET + ebp] |
| mov [1 * PTR_SIZE + ecx], eax |
| mov eax, [PROBE_CPU_ECX_OFFSET + ebp] |
| mov [2 * PTR_SIZE + ecx], eax |
| mov eax, [PROBE_CPU_EBP_OFFSET + ebp] |
| mov [3 * PTR_SIZE + ecx], eax |
| mov eax, [PROBE_CPU_EIP_OFFSET + ebp] |
| mov [4 * PTR_SIZE + ecx], eax |
| mov esp, ecx |
| |
| // Do the remaining restoration by popping off the restore area. |
| popfd |
| pop eax |
| pop ecx |
| pop ebp |
| ret |
| } |
| } |
| #endif // COMPILER(MSVC) |
| |
| #endif // CPU(X86) |
| |
| #if CPU(X86_64) |
| #if COMPILER(GCC_COMPATIBLE) |
| asm ( |
| ".globl " SYMBOL_STRING(ctiMasmProbeTrampoline) "\n" |
| HIDE_SYMBOL(ctiMasmProbeTrampoline) "\n" |
| SYMBOL_STRING(ctiMasmProbeTrampoline) ":" "\n" |
| |
| "pushfq" "\n" |
| |
| // MacroAssemblerX86Common::probe() has already generated code to store some values. |
| // Together with the rflags pushed above, the top of stack now looks like this: |
| // rsp[0 * ptrSize]: rflags |
| // rsp[1 * ptrSize]: return address / saved rip |
| // rsp[2 * ptrSize]: saved rbx |
| // rsp[3 * ptrSize]: saved rdx |
| // rsp[4 * ptrSize]: saved rcx |
| // rsp[5 * ptrSize]: saved rax |
| // |
| // Incoming registers contain: |
| // rcx: Probe::executeProbe |
| // rdx: probe function |
| // rbx: probe arg |
| // rax: scratch (was ctiMasmProbeTrampoline) |
| |
| "movq %rsp, %rax" "\n" |
| "subq $" STRINGIZE_VALUE_OF(PROBE_SIZE + OUT_SIZE) ", %rsp" "\n" |
| |
| // The X86_64 ABI specifies that the worse case stack alignment requirement is 32 bytes. |
| "andq $~0x1f, %rsp" "\n" |
| // Since sp points to the Probe::State, we've ensured that it's protected from interrupts before we initialize it. |
| |
| "movq %rbp, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rsp)" "\n" |
| "movq %rsp, %rbp" "\n" // Save the Probe::State*. |
| |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_EXECUTOR_OFFSET) "(%rbp)" "\n" |
| "movq %rdx, " STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "(%rbp)" "\n" |
| "movq %rbx, " STRINGIZE_VALUE_OF(PROBE_ARG_OFFSET) "(%rbp)" "\n" |
| "movq %rsi, " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%rbp)" "\n" |
| "movq %rdi, " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%rbp)" "\n" |
| |
| "movq 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp)" "\n" |
| "movq 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp)" "\n" |
| "movq 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%rbp)" "\n" |
| "movq 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%rbp)" "\n" |
| "movq 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp)" "\n" |
| "movq 5 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp)" "\n" |
| |
| "movq %rax, %rcx" "\n" |
| "addq $" STRINGIZE_VALUE_OF(6 * PTR_SIZE) ", %rcx" "\n" |
| "movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp)" "\n" |
| |
| "movq %r8, " STRINGIZE_VALUE_OF(PROBE_CPU_R8_OFFSET) "(%rbp)" "\n" |
| "movq %r9, " STRINGIZE_VALUE_OF(PROBE_CPU_R9_OFFSET) "(%rbp)" "\n" |
| "movq %r10, " STRINGIZE_VALUE_OF(PROBE_CPU_R10_OFFSET) "(%rbp)" "\n" |
| "movq %r11, " STRINGIZE_VALUE_OF(PROBE_CPU_R11_OFFSET) "(%rbp)" "\n" |
| "movq %r12, " STRINGIZE_VALUE_OF(PROBE_CPU_R12_OFFSET) "(%rbp)" "\n" |
| "movq %r13, " STRINGIZE_VALUE_OF(PROBE_CPU_R13_OFFSET) "(%rbp)" "\n" |
| "movq %r14, " STRINGIZE_VALUE_OF(PROBE_CPU_R14_OFFSET) "(%rbp)" "\n" |
| "movq %r15, " STRINGIZE_VALUE_OF(PROBE_CPU_R15_OFFSET) "(%rbp)" "\n" |
| |
| "movq %xmm0, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rbp)" "\n" |
| "movq %xmm1, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rbp)" "\n" |
| "movq %xmm2, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rbp)" "\n" |
| "movq %xmm3, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rbp)" "\n" |
| "movq %xmm4, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rbp)" "\n" |
| "movq %xmm5, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rbp)" "\n" |
| "movq %xmm6, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rbp)" "\n" |
| "movq %xmm7, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rbp)" "\n" |
| "movq %xmm8, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM8_OFFSET) "(%rbp)" "\n" |
| "movq %xmm9, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM9_OFFSET) "(%rbp)" "\n" |
| "movq %xmm10, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM10_OFFSET) "(%rbp)" "\n" |
| "movq %xmm11, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM11_OFFSET) "(%rbp)" "\n" |
| "movq %xmm12, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM12_OFFSET) "(%rbp)" "\n" |
| "movq %xmm13, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM13_OFFSET) "(%rbp)" "\n" |
| "movq %xmm14, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM14_OFFSET) "(%rbp)" "\n" |
| "movq %xmm15, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM15_OFFSET) "(%rbp)" "\n" |
| |
| "movq %rbp, %rdi" "\n" // the Probe::State* arg. |
| "call *" STRINGIZE_VALUE_OF(PROBE_EXECUTOR_OFFSET) "(%rbp)" "\n" |
| |
| // Make sure the Probe::State is entirely below the result stack pointer so |
| // that register values are still preserved when we call the initializeStack |
| // function. |
| "movq $" STRINGIZE_VALUE_OF(PROBE_SIZE + OUT_SIZE) ", %rcx" "\n" |
| "movq %rbp, %rax" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rdx" "\n" |
| "addq %rcx, %rax" "\n" |
| "cmpq %rax, %rdx" "\n" |
| "jge " LOCAL_LABEL_STRING(ctiMasmProbeTrampolineProbeStateIsSafe) "\n" |
| |
| // Allocate a safe place on the stack below the result stack pointer to stash the Probe::State. |
| "subq %rcx, %rdx" "\n" |
| "andq $~0x1f, %rdx" "\n" // Keep the stack pointer 32 bytes aligned. |
| "xorq %rax, %rax" "\n" |
| "movq %rdx, %rsp" "\n" |
| |
| "movq $" STRINGIZE_VALUE_OF(PROBE_SIZE) ", %rcx" "\n" |
| |
| // Copy the Probe::State to the safe place. |
| LOCAL_LABEL_STRING(ctiMasmProbeTrampolineCopyLoop) ":" "\n" |
| "movq (%rbp, %rax), %rdx" "\n" |
| "movq %rdx, (%rsp, %rax)" "\n" |
| "addq $" STRINGIZE_VALUE_OF(PTR_SIZE) ", %rax" "\n" |
| "cmpq %rax, %rcx" "\n" |
| "jg " LOCAL_LABEL_STRING(ctiMasmProbeTrampolineCopyLoop) "\n" |
| |
| "movq %rsp, %rbp" "\n" |
| |
| // Call initializeStackFunction if present. |
| LOCAL_LABEL_STRING(ctiMasmProbeTrampolineProbeStateIsSafe) ":" "\n" |
| "xorq %rcx, %rcx" "\n" |
| "addq " STRINGIZE_VALUE_OF(PROBE_INIT_STACK_FUNCTION_OFFSET) "(%rbp), %rcx" "\n" |
| "je " LOCAL_LABEL_STRING(ctiMasmProbeTrampolineRestoreRegisters) "\n" |
| |
| "movq %rbp, %rdi" "\n" // the Probe::State* arg. |
| "call *%rcx" "\n" |
| |
| LOCAL_LABEL_STRING(ctiMasmProbeTrampolineRestoreRegisters) ":" "\n" |
| |
| // To enable probes to modify register state, we copy all registers |
| // out of the Probe::State before returning. |
| |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%rbp), %rdx" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%rbp), %rbx" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%rbp), %rsi" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%rbp), %rdi" "\n" |
| |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R8_OFFSET) "(%rbp), %r8" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R9_OFFSET) "(%rbp), %r9" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R10_OFFSET) "(%rbp), %r10" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R11_OFFSET) "(%rbp), %r11" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R12_OFFSET) "(%rbp), %r12" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R13_OFFSET) "(%rbp), %r13" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R14_OFFSET) "(%rbp), %r14" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_R15_OFFSET) "(%rbp), %r15" "\n" |
| |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rbp), %xmm0" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rbp), %xmm1" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rbp), %xmm2" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rbp), %xmm3" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rbp), %xmm4" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rbp), %xmm5" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rbp), %xmm6" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rbp), %xmm7" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM8_OFFSET) "(%rbp), %xmm8" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM9_OFFSET) "(%rbp), %xmm9" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM10_OFFSET) "(%rbp), %xmm10" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM11_OFFSET) "(%rbp), %xmm11" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM12_OFFSET) "(%rbp), %xmm12" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM13_OFFSET) "(%rbp), %xmm13" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM14_OFFSET) "(%rbp), %xmm14" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_XMM15_OFFSET) "(%rbp), %xmm15" "\n" |
| |
| // There are 6 more registers left to restore: |
| // rax, rcx, rbp, rsp, rip, and rflags. |
| |
| // The restoration process at ctiMasmProbeTrampolineEnd below works by popping |
| // 5 words off the stack into rflags, rax, rcx, rbp, and rip. These 5 words need |
| // to be pushed on top of the final esp value so that just by popping the 5 words, |
| // we'll get the esp that the probe wants to set. Let's call this area (for storing |
| // these 5 words) the restore area. |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rcx" "\n" |
| "subq $5 * " STRINGIZE_VALUE_OF(PTR_SIZE) ", %rcx" "\n" |
| |
| // rcx now points to the restore area. |
| |
| // Copy remaining restore values from the Probe::State to the restore area. |
| // Note: We already ensured above that the Probe::State is in a safe location before |
| // calling the initializeStackFunction. The initializeStackFunction is not allowed to |
| // change the stack pointer again. |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp), %rax" "\n" |
| "movq %rax, 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rcx)" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp), %rax" "\n" |
| "movq %rax, 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rcx)" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp), %rax" "\n" |
| "movq %rax, 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rcx)" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rbp), %rax" "\n" |
| "movq %rax, 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rcx)" "\n" |
| "movq " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp), %rax" "\n" |
| "movq %rax, 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rcx)" "\n" |
| "movq %rcx, %rsp" "\n" |
| |
| // Do the remaining restoration by popping off the restore area. |
| "popfq" "\n" |
| "popq %rax" "\n" |
| "popq %rcx" "\n" |
| "popq %rbp" "\n" |
| "ret" "\n" |
| ); |
| #endif // COMPILER(GCC_COMPATIBLE) |
| #endif // CPU(X86_64) |
| |
| // What code is emitted for the probe? |
| // ================================== |
| // We want to keep the size of the emitted probe invocation code as compact as |
| // possible to minimize the perturbation to the JIT generated code. However, |
| // we also need to preserve the CPU registers and set up the Probe::State to be |
| // passed to the user probe function. |
| // |
| // Hence, we do only the minimum here to preserve a scratch register (i.e. rax |
| // in this case) and the stack pointer (i.e. rsp), and pass the probe arguments. |
| // We'll let the ctiMasmProbeTrampoline handle the rest of the probe invocation |
| // work i.e. saving the CPUState (and setting up the Probe::State), calling the |
| // user probe function, and restoring the CPUState before returning to JIT |
| // generated code. |
| // |
| // What registers need to be saved? |
| // =============================== |
| // The registers are saved for 2 reasons: |
| // 1. To preserve their state in the JITted code. This means that all registers |
| // that are not callee saved needs to be saved. We also need to save the |
| // condition code registers because the probe can be inserted between a test |
| // and a branch. |
| // 2. To allow the probe to inspect the values of the registers for debugging |
| // purposes. This means all registers need to be saved. |
| // |
| // In summary, save everything. But for reasons stated above, we should do the |
| // minimum here and let ctiMasmProbeTrampoline do the heavy lifting to save the |
| // full set. |
| // |
| // What values are in the saved registers? |
| // ====================================== |
| // Conceptually, the saved registers should contain values as if the probe |
| // is not present in the JIT generated code. Hence, they should contain values |
| // that are expected at the start of the instruction immediately following the |
| // probe. |
| // |
| // Specifically, the saved stack pointer register will point to the stack |
| // position before we push the Probe::State frame. The saved rip will point to |
| // the address of the instruction immediately following the probe. |
| |
| void MacroAssembler::probe(Probe::Function function, void* arg) |
| { |
| push(RegisterID::eax); |
| move(TrustedImmPtr(reinterpret_cast<void*>(ctiMasmProbeTrampoline)), RegisterID::eax); |
| push(RegisterID::ecx); |
| move(TrustedImmPtr(reinterpret_cast<void*>(Probe::executeProbe)), RegisterID::ecx); |
| push(RegisterID::edx); |
| move(TrustedImmPtr(reinterpret_cast<void*>(function)), RegisterID::edx); |
| push(RegisterID::ebx); |
| move(TrustedImmPtr(arg), RegisterID::ebx); |
| call(RegisterID::eax, CFunctionPtrTag); |
| } |
| #endif // ENABLE(MASM_PROBE) |
| |
| MacroAssemblerX86Common::CPUID MacroAssemblerX86Common::getCPUID(unsigned level) |
| { |
| return getCPUIDEx(level, 0); |
| } |
| |
| MacroAssemblerX86Common::CPUID MacroAssemblerX86Common::getCPUIDEx(unsigned level, unsigned count) |
| { |
| CPUID result { }; |
| #if COMPILER(MSVC) |
| __cpuidex(bitwise_cast<int*>(result.data()), level, count); |
| #else |
| __asm__ ( |
| "cpuid\n" |
| : "=a"(result[0]), "=b"(result[1]), "=c"(result[2]), "=d"(result[3]) |
| : "0"(level), "2"(count) |
| ); |
| #endif |
| return result; |
| } |
| |
| void MacroAssemblerX86Common::collectCPUFeatures() |
| { |
| static std::once_flag onceKey; |
| std::call_once(onceKey, [] { |
| { |
| CPUID cpuid = getCPUID(0x1); |
| s_sse4_1CheckState = (cpuid[2] & (1 << 19)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear; |
| s_sse4_2CheckState = (cpuid[2] & (1 << 20)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear; |
| s_popcntCheckState = (cpuid[2] & (1 << 23)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear; |
| s_avxCheckState = (cpuid[2] & (1 << 28)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear; |
| } |
| { |
| CPUID cpuid = getCPUID(0x7); |
| s_bmi1CheckState = (cpuid[2] & (1 << 3)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear; |
| } |
| { |
| CPUID cpuid = getCPUID(0x80000001); |
| s_lzcntCheckState = (cpuid[2] & (1 << 5)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear; |
| } |
| }); |
| } |
| |
| MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_sse4_1CheckState = CPUIDCheckState::NotChecked; |
| MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_sse4_2CheckState = CPUIDCheckState::NotChecked; |
| MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_avxCheckState = CPUIDCheckState::NotChecked; |
| MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_lzcntCheckState = CPUIDCheckState::NotChecked; |
| MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_bmi1CheckState = CPUIDCheckState::NotChecked; |
| MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_popcntCheckState = CPUIDCheckState::NotChecked; |
| |
| } // namespace JSC |
| |
| #endif // ENABLE(ASSEMBLER) && (CPU(X86) || CPU(X86_64)) |
