[apple/javascriptcore.git] / jit / JITStubsX86_64.h

/*
 * 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
Commit	Line	Data
81345200 A	1	/*
	2	* Copyright (C) 2008, 2009, 2013 Apple Inc. All rights reserved.
	3	* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
	4	* Copyright (C) Research In Motion Limited 2010, 2011. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	*
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of Apple Inc. ("Apple") nor the names of
	16	* its contributors may be used to endorse or promote products derived
	17	* from this software without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	20	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	21	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	22	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	23	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	24	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	25	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	26	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	27	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	28	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	29	*/
	30
	31	#ifndef JITStubsX86_64_h
	32	#define JITStubsX86_64_h
	33
	34	#include "JITStubsX86Common.h"
	35
	36	#if !CPU(X86_64)
	37	#error "JITStubsX86_64.h should only be #included if CPU(X86_64)"
	38	#endif
	39
	40	#if !USE(JSVALUE64)
	41	#error "JITStubsX86_64.h only implements USE(JSVALUE64)"
	42	#endif
	43
	44	namespace JSC {
	45
	46	#if COMPILER(GCC)
	47
	48	#if USE(MASM_PROBE)
	49	asm (
	50	".globl " SYMBOL_STRING(ctiMasmProbeTrampoline) "\n"
	51	HIDE_SYMBOL(ctiMasmProbeTrampoline) "\n"
	52	SYMBOL_STRING(ctiMasmProbeTrampoline) ":" "\n"
	53
	54	"pushfq" "\n"
	55
	56	// MacroAssembler::probe() has already generated code to store some values.
	57	// Together with the rflags pushed above, the top of stack now looks like
	58	// this:
	59	// esp[0 * ptrSize]: rflags
	60	// esp[1 * ptrSize]: return address / saved rip
	61	// esp[2 * ptrSize]: probeFunction
	62	// esp[3 * ptrSize]: arg1
	63	// esp[4 * ptrSize]: arg2
	64	// esp[5 * ptrSize]: saved rax
65	// esp[6 * ptrSize]: saved rsp
66
67	"movq %rsp, %rax" "\n"
68	"subq $" STRINGIZE_VALUE_OF(PROBE_SIZE) ", %rsp" "\n"
69
70	// The X86_64 ABI specifies that the worse case stack alignment requirement
71	// is 32 bytes.
72	"andq $~0x1f, %rsp" "\n"
73
74	"movq %rbp, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rsp)" "\n"
75	"movq %rsp, %rbp" "\n" // Save the ProbeContext*.
76
77	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp)" "\n"
78	"movq %rdx, " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%rbp)" "\n"
79	"movq %rbx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%rbp)" "\n"
80	"movq %rsi, " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%rbp)" "\n"
81	"movq %rdi, " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%rbp)" "\n"
82
83	"movq 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
84	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp)" "\n"
85	"movq 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
86	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp)" "\n"
87	"movq 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
88	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "(%rbp)" "\n"
89	"movq 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
90	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_ARG1_OFFSET) "(%rbp)" "\n"
91	"movq 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
92	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_ARG2_OFFSET) "(%rbp)" "\n"
93	"movq 5 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
94	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp)" "\n"
95	"movq 6 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax), %rcx" "\n"
96	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp)" "\n"
97
98	"movq %r8, " STRINGIZE_VALUE_OF(PROBE_CPU_R8_OFFSET) "(%rbp)" "\n"
99	"movq %r9, " STRINGIZE_VALUE_OF(PROBE_CPU_R9_OFFSET) "(%rbp)" "\n"
100	"movq %r10, " STRINGIZE_VALUE_OF(PROBE_CPU_R10_OFFSET) "(%rbp)" "\n"
101	"movq %r11, " STRINGIZE_VALUE_OF(PROBE_CPU_R11_OFFSET) "(%rbp)" "\n"
102	"movq %r12, " STRINGIZE_VALUE_OF(PROBE_CPU_R12_OFFSET) "(%rbp)" "\n"
103	"movq %r13, " STRINGIZE_VALUE_OF(PROBE_CPU_R13_OFFSET) "(%rbp)" "\n"
104	"movq %r14, " STRINGIZE_VALUE_OF(PROBE_CPU_R14_OFFSET) "(%rbp)" "\n"
105	"movq %r15, " STRINGIZE_VALUE_OF(PROBE_CPU_R15_OFFSET) "(%rbp)" "\n"
106
107	"movdqa %xmm0, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rbp)" "\n"
108	"movdqa %xmm1, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rbp)" "\n"
109	"movdqa %xmm2, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rbp)" "\n"
110	"movdqa %xmm3, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rbp)" "\n"
111	"movdqa %xmm4, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rbp)" "\n"
112	"movdqa %xmm5, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rbp)" "\n"
113	"movdqa %xmm6, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rbp)" "\n"
114	"movdqa %xmm7, " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rbp)" "\n"
115
116	"movq %rbp, %rdi" "\n" // the ProbeContext* arg.
117	"call *" STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "(%rbp)" "\n"
118
119	// To enable probes to modify register state, we copy all registers
120	// out of the ProbeContext before returning.
121
122	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EDX_OFFSET) "(%rbp), %rdx" "\n"
123	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBX_OFFSET) "(%rbp), %rbx" "\n"
124	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESI_OFFSET) "(%rbp), %rsi" "\n"
125	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EDI_OFFSET) "(%rbp), %rdi" "\n"
126
127	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R8_OFFSET) "(%rbp), %r8" "\n"
128	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R9_OFFSET) "(%rbp), %r9" "\n"
129	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R10_OFFSET) "(%rbp), %r10" "\n"
130	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R11_OFFSET) "(%rbp), %r11" "\n"
131	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R12_OFFSET) "(%rbp), %r12" "\n"
132	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R13_OFFSET) "(%rbp), %r13" "\n"
133	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R14_OFFSET) "(%rbp), %r14" "\n"
134	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_R15_OFFSET) "(%rbp), %r15" "\n"
135
136	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM0_OFFSET) "(%rbp), %xmm0" "\n"
137	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM1_OFFSET) "(%rbp), %xmm1" "\n"
138	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM2_OFFSET) "(%rbp), %xmm2" "\n"
139	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM3_OFFSET) "(%rbp), %xmm3" "\n"
140	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM4_OFFSET) "(%rbp), %xmm4" "\n"
141	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM5_OFFSET) "(%rbp), %xmm5" "\n"
142	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM6_OFFSET) "(%rbp), %xmm6" "\n"
143	"movdqa " STRINGIZE_VALUE_OF(PROBE_CPU_XMM7_OFFSET) "(%rbp), %xmm7" "\n"
144
145	// There are 6 more registers left to restore:
146	// rax, rcx, rbp, rsp, rip, and rflags.
147	// We need to handle these last few restores carefully because:
148	//
149	// 1. We need to push the return address on the stack for ret to use
150	// That means we need to write to the stack.
151	// 2. The user probe function may have altered the restore value of esp to
152	// point to the vicinity of one of the restore values for the remaining
153	// registers left to be restored.
154	// That means, for requirement 1, we may end up writing over some of the
155	// restore values. We can check for this, and first copy the restore
156	// values to a "safe area" on the stack before commencing with the action
157	// for requirement 1.
158	// 3. For both requirement 2, we need to ensure that the "safe area" is
159	// protected from interrupt handlers overwriting it. Hence, the esp needs
160	// to be adjusted to include the "safe area" before we start copying the
161	// the restore values.
162
163	"movq %rbp, %rax" "\n"
164	"addq $" STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) ", %rax" "\n"
165	"cmpq %rax, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp)" "\n"
166	"jg " SYMBOL_STRING(ctiMasmProbeTrampolineEnd) "\n"
167
168	// Locate the "safe area" at 2x sizeof(ProbeContext) below where the new
169	// rsp will be. This time we don't have to 32-byte align it because we're
170	// not using to store any xmm regs.
171	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rax" "\n"
172	"subq $2 * " STRINGIZE_VALUE_OF(PROBE_SIZE) ", %rax" "\n"
173	"movq %rax, %rsp" "\n"
174
175	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp), %rcx" "\n"
176	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rax)" "\n"
177	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp), %rcx" "\n"
178	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rax)" "\n"
179	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rbp), %rcx" "\n"
180	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rax)" "\n"
181	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rcx" "\n"
182	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rax)" "\n"
183	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp), %rcx" "\n"
184	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rax)" "\n"
185	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp), %rcx" "\n"
186	"movq %rcx, " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rax)" "\n"
187	"movq %rax, %rbp" "\n"
188
189	SYMBOL_STRING(ctiMasmProbeTrampolineEnd) ":" "\n"
190	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ESP_OFFSET) "(%rbp), %rax" "\n"
191	"subq $5 * " STRINGIZE_VALUE_OF(PTR_SIZE) ", %rax" "\n"
192	// At this point, %rsp should be < %rax.
193
194	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EFLAGS_OFFSET) "(%rbp), %rcx" "\n"
195	"movq %rcx, 0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
196	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EAX_OFFSET) "(%rbp), %rcx" "\n"
197	"movq %rcx, 1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
198	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_ECX_OFFSET) "(%rbp), %rcx" "\n"
199	"movq %rcx, 2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
200	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EBP_OFFSET) "(%rbp), %rcx" "\n"
201	"movq %rcx, 3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
202	"movq " STRINGIZE_VALUE_OF(PROBE_CPU_EIP_OFFSET) "(%rbp), %rcx" "\n"
203	"movq %rcx, 4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "(%rax)" "\n"
204	"movq %rax, %rsp" "\n"
205
206	"popfq" "\n"
207	"popq %rax" "\n"
208	"popq %rcx" "\n"
209	"popq %rbp" "\n"
210	"ret" "\n"
211	);
212	#endif // USE(MASM_PROBE)
213
214	#endif // COMPILER(GCC)
215
216	} // namespace JSC
217
218	#endif // JITStubsX86_64_h