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darling-JavaScriptCore/assembler/MacroAssemblerX86Common.cpp

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/*
* Copyright (C) 2013-2019 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" JSC_DECLARE_JIT_OPERATION(ctiMasmProbeTrampoline, void, ());
JSC_ANNOTATE_JIT_OPERATION(ctiMasmProbeTrampolineId, 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"
"pushq %rbp" "\n"
"movq %rsp, %rbp" "\n"
"pushfq" "\n"
// MacroAssemblerX86Common::probe() has already generated code to store some values.
// Together with the rbp and rflags pushed above, the top of stack now looks like this:
// rbp[-1 * ptrSize]: rflags
// rbp[0 * ptrSize]: rbp / previousCallFrame
// rbp[1 * ptrSize]: return address / saved rip
// rbp[2 * ptrSize]: saved rbx
// rbp[3 * ptrSize]: saved rdx
// rbp[4 * ptrSize]: saved rcx
// rbp[5 * ptrSize]: saved rax
//
// Incoming registers contain:
// rcx: Probe::executeProbe
// rdx: probe function
// rbx: probe arg
// rax: scratch (was ctiMasmProbeTrampoline)
"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 %rcx, " STRINGIZE_VALUE_OF(PROBE_EXECUTOR_OFFSET) "(%rsp)" "\n"
"movq %rdx, " STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "(%rsp)" "\n"
"movq %rbx, " STRINGIZE_VALUE_OF(PROBE_ARG_OFFSET) "(%rsp)" "\n"
"movq %rsi, " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%rsp)" "\n"
"movq %rdi, " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%rsp)" "\n"
"movq -1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rsp)" "\n"
"movq 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rsp)" "\n"
"movq 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rsp)" "\n"
"movq 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%rsp)" "\n"
"movq 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%rsp)" "\n"
"movq 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rsp)" "\n"
"movq 5 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rsp)" "\n"
"movq %rbp, %rcx" "\n"
"addq $" STRINGIZE_VALUE_OF(6 * PTR_SIZE) ", %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rsp)" "\n"
"movq %r8, " STRINGIZE_VALUE_OF(PROBE_CPU_R8_OFFSET) "(%rsp)" "\n"
"movq %r9, " STRINGIZE_VALUE_OF(PROBE_CPU_R9_OFFSET) "(%rsp)" "\n"
"movq %r10, " STRINGIZE_VALUE_OF(PROBE_CPU_R10_OFFSET) "(%rsp)" "\n"
"movq %r11, " STRINGIZE_VALUE_OF(PROBE_CPU_R11_OFFSET) "(%rsp)" "\n"
"movq %r12, " STRINGIZE_VALUE_OF(PROBE_CPU_R12_OFFSET) "(%rsp)" "\n"
"movq %r13, " STRINGIZE_VALUE_OF(PROBE_CPU_R13_OFFSET) "(%rsp)" "\n"
"movq %r14, " STRINGIZE_VALUE_OF(PROBE_CPU_R14_OFFSET) "(%rsp)" "\n"
"movq %r15, " STRINGIZE_VALUE_OF(PROBE_CPU_R15_OFFSET) "(%rsp)" "\n"
"movq %xmm0, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rsp)" "\n"
"movq %xmm1, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rsp)" "\n"
"movq %xmm2, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rsp)" "\n"
"movq %xmm3, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rsp)" "\n"
"movq %xmm4, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rsp)" "\n"
"movq %xmm5, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rsp)" "\n"
"movq %xmm6, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rsp)" "\n"
"movq %xmm7, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rsp)" "\n"
"movq %xmm8, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM8_OFFSET) "(%rsp)" "\n"
"movq %xmm9, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM9_OFFSET) "(%rsp)" "\n"
"movq %xmm10, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM10_OFFSET) "(%rsp)" "\n"
"movq %xmm11, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM11_OFFSET) "(%rsp)" "\n"
"movq %xmm12, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM12_OFFSET) "(%rsp)" "\n"
"movq %xmm13, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM13_OFFSET) "(%rsp)" "\n"
"movq %xmm14, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM14_OFFSET) "(%rsp)" "\n"
"movq %xmm15, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM15_OFFSET) "(%rsp)" "\n"
"movq %rsp, %rdi" "\n" // the Probe::State* arg.
"call *" STRINGIZE_VALUE_OF(PROBE_EXECUTOR_OFFSET) "(%rsp)" "\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 %rsp, %rbp" "\n"
"movq $" STRINGIZE_VALUE_OF(PROBE_SIZE + OUT_SIZE) ", %rcx" "\n"
"movq %rsp, %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))
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