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/*
* Copyright (C) 2008, 2009, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
* Copyright (C) Research In Motion Limited 2010, 2011. 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#ifndef JITStubsX86_64_h
#define JITStubsX86_64_h
#include "JITStubsX86Common.h"
#if !CPU(X86_64)
#error "JITStubsX86_64.h should only be #included if CPU(X86_64)"
#endif
#if !USE(JSVALUE64)
#error "JITStubsX86_64.h only implements USE(JSVALUE64)"
#endif
namespace JSC {
#if COMPILER(GCC)
#if USE(MASM_PROBE)
asm (
".globl " SYMBOL_STRING(ctiMasmProbeTrampoline) "\n"
HIDE_SYMBOL(ctiMasmProbeTrampoline) "\n"
SYMBOL_STRING(ctiMasmProbeTrampoline) ":" "\n"
"pushfq" "\n"
// MacroAssembler::probe() has already generated code to store some values.
// Together with the rflags pushed above, the top of stack now looks like
// this:
// esp[0 * ptrSize]: rflags
// esp[1 * ptrSize]: return address / saved rip
// esp[2 * ptrSize]: probeFunction
// esp[3 * ptrSize]: arg1
// esp[4 * ptrSize]: arg2
// esp[5 * ptrSize]: saved rax
// esp[6 * ptrSize]: saved rsp
"movq %rsp, %rax" "\n"
"subq $" STRINGIZE_VALUE_OF(PROBE_SIZE) ", %rsp" "\n"
// The X86_64 ABI specifies that the worse case stack alignment requirement
// is 32 bytes.
"andq $~0x1f, %rsp" "\n"
"movq %rbp, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rsp)" "\n"
"movq %rsp, %rbp" "\n" // Save the ProbeContext*.
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp)" "\n"
"movq %rdx, " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%rbp)" "\n"
"movq %rbx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_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_PROBE_FUNCTION_OFFSET) "(%rbp)" "\n"
"movq 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_ARG1_OFFSET) "(%rbp)" "\n"
"movq 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_ARG2_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 6 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %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"
"movdqa %xmm0, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rbp)" "\n"
"movdqa %xmm1, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rbp)" "\n"
"movdqa %xmm2, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rbp)" "\n"
"movdqa %xmm3, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rbp)" "\n"
"movdqa %xmm4, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rbp)" "\n"
"movdqa %xmm5, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rbp)" "\n"
"movdqa %xmm6, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rbp)" "\n"
"movdqa %xmm7, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rbp)" "\n"
"movq %rbp, %rdi" "\n" // the ProbeContext* arg.
"call *" STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "(%rbp)" "\n"
// To enable probes to modify register state, we copy all registers
// out of the ProbeContext 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"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rbp), %xmm0" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rbp), %xmm1" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rbp), %xmm2" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rbp), %xmm3" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rbp), %xmm4" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rbp), %xmm5" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rbp), %xmm6" "\n"
"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rbp), %xmm7" "\n"
// There are 6 more registers left to restore:
// rax, rcx, rbp, rsp, rip, and rflags.
// We need to handle these last few restores carefully because:
//
// 1. We need to push the return address on the stack for ret to use
// That means we need to write to the stack.
// 2. The user probe function may have altered the restore value of esp to
// point to the vicinity of one of the restore values for the remaining
// registers left to be restored.
// That means, for requirement 1, we may end up writing over some of the
// restore values. We can check for this, and first copy the restore
// values to a "safe area" on the stack before commencing with the action
// for requirement 1.
// 3. For both requirement 2, we need to ensure that the "safe area" is
// protected from interrupt handlers overwriting it. Hence, the esp needs
// to be adjusted to include the "safe area" before we start copying the
// the restore values.
"movq %rbp, %rax" "\n"
"addq $" STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) ", %rax" "\n"
"cmpq %rax, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp)" "\n"
"jg " SYMBOL_STRING(ctiMasmProbeTrampolineEnd) "\n"
// Locate the "safe area" at 2x sizeof(ProbeContext) below where the new
// rsp will be. This time we don't have to 32-byte align it because we're
// not using to store any xmm regs.
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rax" "\n"
"subq $2 * " STRINGIZE_VALUE_OF(PROBE_SIZE) ", %rax" "\n"
"movq %rax, %rsp" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rax)" "\n"
"movq %rax, %rbp" "\n"
SYMBOL_STRING(ctiMasmProbeTrampolineEnd) ":" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rax" "\n"
"subq $5 * " STRINGIZE_VALUE_OF(PTR_SIZE) ", %rax" "\n"
// At this point, %rsp should be < %rax.
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp), %rcx" "\n"
"movq %rcx, 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
"movq %rax, %rsp" "\n"
"popfq" "\n"
"popq %rax" "\n"
"popq %rcx" "\n"
"popq %rbp" "\n"
"ret" "\n"
);
#endif // USE(MASM_PROBE)
#endif // COMPILER(GCC)
} // namespace JSC
#endif // JITStubsX86_64_h
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