/*
 * 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 Computer, 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 JITStubsARM_h
#define JITStubsARM_h

#if !CPU(ARM_TRADITIONAL)
#error "JITStubsARM.h should only be #included if CPU(ARM_TRADITIONAL)"
#endif

#if !USE(JSVALUE32_64)
#error "JITStubsARM.h only implements USE(JSVALUE32_64)"
#endif

namespace JSC {

// Also update the MSVC section (defined at DEFINE_STUB_FUNCTION)
// when changing one of the following values.
#define THUNK_RETURN_ADDRESS_OFFSET 64
#define PRESERVEDR4_OFFSET          68

#if COMPILER(GCC)

#if USE(MASM_PROBE)
// The following are offsets for MacroAssembler::ProbeContext fields accessed
// by the ctiMasmProbeTrampoline stub.

#define PTR_SIZE 4
#define PROBE_PROBE_FUNCTION_OFFSET (0 * PTR_SIZE)
#define PROBE_ARG1_OFFSET (1 * PTR_SIZE)
#define PROBE_ARG2_OFFSET (2 * PTR_SIZE)
#define PROBE_JIT_STACK_FRAME_OFFSET (3 * PTR_SIZE)

#define PROBE_FIRST_GPREG_OFFSET (4 * PTR_SIZE)

#define GPREG_SIZE 4
#define PROBE_CPU_R0_OFFSET (PROBE_FIRST_GPREG_OFFSET + (0 * GPREG_SIZE))
#define PROBE_CPU_R1_OFFSET (PROBE_FIRST_GPREG_OFFSET + (1 * GPREG_SIZE))
#define PROBE_CPU_R2_OFFSET (PROBE_FIRST_GPREG_OFFSET + (2 * GPREG_SIZE))
#define PROBE_CPU_R3_OFFSET (PROBE_FIRST_GPREG_OFFSET + (3 * GPREG_SIZE))
#define PROBE_CPU_R4_OFFSET (PROBE_FIRST_GPREG_OFFSET + (4 * GPREG_SIZE))
#define PROBE_CPU_R5_OFFSET (PROBE_FIRST_GPREG_OFFSET + (5 * GPREG_SIZE))
#define PROBE_CPU_R6_OFFSET (PROBE_FIRST_GPREG_OFFSET + (6 * GPREG_SIZE))
#define PROBE_CPU_R7_OFFSET (PROBE_FIRST_GPREG_OFFSET + (7 * GPREG_SIZE))
#define PROBE_CPU_R8_OFFSET (PROBE_FIRST_GPREG_OFFSET + (8 * GPREG_SIZE))
#define PROBE_CPU_R9_OFFSET (PROBE_FIRST_GPREG_OFFSET + (9 * GPREG_SIZE))
#define PROBE_CPU_R10_OFFSET (PROBE_FIRST_GPREG_OFFSET + (10 * GPREG_SIZE))
#define PROBE_CPU_R11_OFFSET (PROBE_FIRST_GPREG_OFFSET + (11 * GPREG_SIZE))
#define PROBE_CPU_IP_OFFSET (PROBE_FIRST_GPREG_OFFSET + (12 * GPREG_SIZE))
#define PROBE_CPU_SP_OFFSET (PROBE_FIRST_GPREG_OFFSET + (13 * GPREG_SIZE))
#define PROBE_CPU_LR_OFFSET (PROBE_FIRST_GPREG_OFFSET + (14 * GPREG_SIZE))
#define PROBE_CPU_PC_OFFSET (PROBE_FIRST_GPREG_OFFSET + (15 * GPREG_SIZE))

#define PROBE_CPU_APSR_OFFSET (PROBE_FIRST_GPREG_OFFSET + (16 * GPREG_SIZE))
#define PROBE_CPU_FPSCR_OFFSET (PROBE_FIRST_GPREG_OFFSET + (17 * GPREG_SIZE))

#define PROBE_FIRST_FPREG_OFFSET (PROBE_FIRST_GPREG_OFFSET + (18 * GPREG_SIZE))

#define FPREG_SIZE 8
#define PROBE_CPU_D0_OFFSET (PROBE_FIRST_FPREG_OFFSET + (0 * FPREG_SIZE))
#define PROBE_CPU_D1_OFFSET (PROBE_FIRST_FPREG_OFFSET + (1 * FPREG_SIZE))
#define PROBE_CPU_D2_OFFSET (PROBE_FIRST_FPREG_OFFSET + (2 * FPREG_SIZE))
#define PROBE_CPU_D3_OFFSET (PROBE_FIRST_FPREG_OFFSET + (3 * FPREG_SIZE))
#define PROBE_CPU_D4_OFFSET (PROBE_FIRST_FPREG_OFFSET + (4 * FPREG_SIZE))
#define PROBE_CPU_D5_OFFSET (PROBE_FIRST_FPREG_OFFSET + (5 * FPREG_SIZE))
#define PROBE_CPU_D6_OFFSET (PROBE_FIRST_FPREG_OFFSET + (6 * FPREG_SIZE))
#define PROBE_CPU_D7_OFFSET (PROBE_FIRST_FPREG_OFFSET + (7 * FPREG_SIZE))
#define PROBE_CPU_D8_OFFSET (PROBE_FIRST_FPREG_OFFSET + (8 * FPREG_SIZE))
#define PROBE_CPU_D9_OFFSET (PROBE_FIRST_FPREG_OFFSET + (9 * FPREG_SIZE))
#define PROBE_CPU_D10_OFFSET (PROBE_FIRST_FPREG_OFFSET + (10 * FPREG_SIZE))
#define PROBE_CPU_D11_OFFSET (PROBE_FIRST_FPREG_OFFSET + (11 * FPREG_SIZE))
#define PROBE_CPU_D12_OFFSET (PROBE_FIRST_FPREG_OFFSET + (12 * FPREG_SIZE))
#define PROBE_CPU_D13_OFFSET (PROBE_FIRST_FPREG_OFFSET + (13 * FPREG_SIZE))
#define PROBE_CPU_D14_OFFSET (PROBE_FIRST_FPREG_OFFSET + (14 * FPREG_SIZE))
#define PROBE_CPU_D15_OFFSET (PROBE_FIRST_FPREG_OFFSET + (15 * FPREG_SIZE))

#define PROBE_SIZE (PROBE_FIRST_FPREG_OFFSET + (16 * FPREG_SIZE))

// These ASSERTs remind you that if you change the layout of ProbeContext,
// you need to change ctiMasmProbeTrampoline offsets above to match.
#define PROBE_OFFSETOF(x) offsetof(struct MacroAssembler::ProbeContext, x)
COMPILE_ASSERT(PROBE_OFFSETOF(probeFunction) == PROBE_PROBE_FUNCTION_OFFSET, ProbeContext_probeFunction_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(arg1) == PROBE_ARG1_OFFSET, ProbeContext_arg1_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(arg2) == PROBE_ARG2_OFFSET, ProbeContext_arg2_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(jitStackFrame) == PROBE_JIT_STACK_FRAME_OFFSET, ProbeContext_jitStackFrame_offset_matches_ctiMasmProbeTrampoline);

COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r0) == PROBE_CPU_R0_OFFSET, ProbeContext_cpu_r0_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r1) == PROBE_CPU_R1_OFFSET, ProbeContext_cpu_r1_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r2) == PROBE_CPU_R2_OFFSET, ProbeContext_cpu_r2_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r3) == PROBE_CPU_R3_OFFSET, ProbeContext_cpu_r3_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r4) == PROBE_CPU_R4_OFFSET, ProbeContext_cpu_r4_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r5) == PROBE_CPU_R5_OFFSET, ProbeContext_cpu_r5_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r6) == PROBE_CPU_R6_OFFSET, ProbeContext_cpu_r6_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r7) == PROBE_CPU_R7_OFFSET, ProbeContext_cpu_r70_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r8) == PROBE_CPU_R8_OFFSET, ProbeContext_cpu_r8_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r9) == PROBE_CPU_R9_OFFSET, ProbeContext_cpu_r9_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r10) == PROBE_CPU_R10_OFFSET, ProbeContext_cpu_r10_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.r11) == PROBE_CPU_R11_OFFSET, ProbeContext_cpu_r11_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.ip) == PROBE_CPU_IP_OFFSET, ProbeContext_cpu_ip_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.sp) == PROBE_CPU_SP_OFFSET, ProbeContext_cpu_sp_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.lr) == PROBE_CPU_LR_OFFSET, ProbeContext_cpu_lr_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.pc) == PROBE_CPU_PC_OFFSET, ProbeContext_cpu_pc_offset_matches_ctiMasmProbeTrampoline);

COMPILE_ASSERT(PROBE_OFFSETOF(cpu.apsr) == PROBE_CPU_APSR_OFFSET, ProbeContext_cpu_apsr_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.fpscr) == PROBE_CPU_FPSCR_OFFSET, ProbeContext_cpu_fpscr_offset_matches_ctiMasmProbeTrampoline);

COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d0) == PROBE_CPU_D0_OFFSET, ProbeContext_cpu_d0_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d1) == PROBE_CPU_D1_OFFSET, ProbeContext_cpu_d1_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d2) == PROBE_CPU_D2_OFFSET, ProbeContext_cpu_d2_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d3) == PROBE_CPU_D3_OFFSET, ProbeContext_cpu_d3_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d4) == PROBE_CPU_D4_OFFSET, ProbeContext_cpu_d4_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d5) == PROBE_CPU_D5_OFFSET, ProbeContext_cpu_d5_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d6) == PROBE_CPU_D6_OFFSET, ProbeContext_cpu_d6_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d7) == PROBE_CPU_D7_OFFSET, ProbeContext_cpu_d7_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d8) == PROBE_CPU_D8_OFFSET, ProbeContext_cpu_d8_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d9) == PROBE_CPU_D9_OFFSET, ProbeContext_cpu_d9_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d10) == PROBE_CPU_D10_OFFSET, ProbeContext_cpu_d10_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d11) == PROBE_CPU_D11_OFFSET, ProbeContext_cpu_d11_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d12) == PROBE_CPU_D12_OFFSET, ProbeContext_cpu_d12_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d13) == PROBE_CPU_D13_OFFSET, ProbeContext_cpu_d13_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d14) == PROBE_CPU_D14_OFFSET, ProbeContext_cpu_d14_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(PROBE_OFFSETOF(cpu.d15) == PROBE_CPU_D15_OFFSET, ProbeContext_cpu_d15_offset_matches_ctiMasmProbeTrampoline);
COMPILE_ASSERT(sizeof(MacroAssembler::ProbeContext) == PROBE_SIZE, ProbeContext_size_matches_ctiMasmProbeTrampoline);
#undef PROBE_OFFSETOF

#endif // USE(MASM_PROBE)


asm (
".text" "\n"
".globl " SYMBOL_STRING(ctiTrampoline) "\n"
HIDE_SYMBOL(ctiTrampoline) "\n"
INLINE_ARM_FUNCTION(ctiTrampoline)
SYMBOL_STRING(ctiTrampoline) ":" "\n"
    "stmdb sp!, {r1-r3}" "\n"
    "stmdb sp!, {r4-r6, r8-r11, lr}" "\n"
    "sub sp, sp, #" STRINGIZE_VALUE_OF(PRESERVEDR4_OFFSET) "\n"
    "mov r5, r2" "\n"
    "mov r6, #512" "\n"
    // r0 contains the code
    "blx r0" "\n"
    "add sp, sp, #" STRINGIZE_VALUE_OF(PRESERVEDR4_OFFSET) "\n"
    "ldmia sp!, {r4-r6, r8-r11, lr}" "\n"
    "add sp, sp, #12" "\n"
    "bx lr" "\n"
".globl " SYMBOL_STRING(ctiTrampolineEnd) "\n"
HIDE_SYMBOL(ctiTrampolineEnd) "\n"
SYMBOL_STRING(ctiTrampolineEnd) ":" "\n"
);

asm (
".text" "\n"
".globl " SYMBOL_STRING(ctiVMThrowTrampoline) "\n"
HIDE_SYMBOL(ctiVMThrowTrampoline) "\n"
INLINE_ARM_FUNCTION(ctiVMThrowTrampoline)
SYMBOL_STRING(ctiVMThrowTrampoline) ":" "\n"
    "mov r0, sp" "\n"
    "bl " SYMBOL_STRING(cti_vm_throw) "\n"

// Both has the same return sequence
".text" "\n"
".globl " SYMBOL_STRING(ctiOpThrowNotCaught) "\n"
HIDE_SYMBOL(ctiOpThrowNotCaught) "\n"
INLINE_ARM_FUNCTION(ctiOpThrowNotCaught)
SYMBOL_STRING(ctiOpThrowNotCaught) ":" "\n"
    "add sp, sp, #" STRINGIZE_VALUE_OF(PRESERVEDR4_OFFSET) "\n"
    "ldmia sp!, {r4-r6, r8-r11, lr}" "\n"
    "add sp, sp, #12" "\n"
    "bx lr" "\n"
);

asm (
".text" "\n"
".globl " SYMBOL_STRING(ctiVMThrowTrampolineSlowpath) "\n"
HIDE_SYMBOL(ctiVMThrowTrampolineSlowpath) "\n"
INLINE_ARM_FUNCTION(ctiVMThrowTrampolineSlowpath)
SYMBOL_STRING(ctiVMThrowTrampolineSlowpath) ":" "\n"
    "mov r0, r5" "\n"
    "bl " SYMBOL_STRING(cti_vm_throw_slowpath) "\n"
     // When cti_vm_throw_slowpath returns, r0 has callFrame and r1 has handler address
     "add sp, sp, #" STRINGIZE_VALUE_OF(PRESERVEDR4_OFFSET) "\n"
     "ldmia sp!, {r4-r6, r8-r11, lr}" "\n"
     "add sp, sp, #12" "\n"
     "bx r1" "\n"
);

#if USE(MASM_PROBE)
asm (
".text" "\n"
".globl " SYMBOL_STRING(ctiMasmProbeTrampoline) "\n"
HIDE_SYMBOL(ctiMasmProbeTrampoline) "\n"
INLINE_ARM_FUNCTION(ctiMasmProbeTrampoline) "\n"
SYMBOL_STRING(ctiMasmProbeTrampoline) ":" "\n"

    // MacroAssembler::probe() has already generated code to store some values.
    // The top of stack now looks like this:
    //     esp[0 * ptrSize]: probeFunction
    //     esp[1 * ptrSize]: arg1
    //     esp[2 * ptrSize]: arg2
    //     esp[3 * ptrSize]: saved r3 / S0
    //     esp[4 * ptrSize]: saved ip
    //     esp[5 * ptrSize]: saved lr
    //     esp[6 * ptrSize]: saved sp

    "mov       ip, sp" "\n"
    "mov       r3, sp" "\n"
    "sub       r3, r3, #" STRINGIZE_VALUE_OF(PROBE_SIZE) "\n"

    // The ARM EABI specifies that the stack needs to be 16 byte aligned.
    "bic       r3, r3, #0xf" "\n"
    "mov       sp, r3" "\n"

    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_PC_OFFSET) "]" "\n"
    "add       lr, sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_R0_OFFSET) "\n"
    "stmia     lr, { r0-r11 }" "\n"
    "mrs       lr, APSR" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_APSR_OFFSET) "]" "\n"
    "vmrs      lr, FPSCR" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_FPSCR_OFFSET) "]" "\n"

    "ldr       lr, [ip, #0 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "]" "\n"
    "ldr       lr, [ip, #1 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_ARG1_OFFSET) "]" "\n"
    "ldr       lr, [ip, #2 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_ARG2_OFFSET) "]" "\n"
    "ldr       lr, [ip, #3 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_R3_OFFSET) "]" "\n"
    "ldr       lr, [ip, #4 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_IP_OFFSET) "]" "\n"
    "ldr       lr, [ip, #5 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_LR_OFFSET) "]" "\n"
    "ldr       lr, [ip, #6 * " STRINGIZE_VALUE_OF(PTR_SIZE) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_JIT_STACK_FRAME_OFFSET) "]" "\n"

    "ldr       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_PC_OFFSET) "]" "\n"

    "add       ip, sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_D0_OFFSET) "\n"
    "vstmia.64 ip, { d0-d15 }" "\n"

    "mov       fp, sp" "\n" // Save the ProbeContext*.

    "ldr       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_PROBE_FUNCTION_OFFSET) "]" "\n"
    "mov       r0, sp" "\n" // the ProbeContext* arg.
    "blx       ip" "\n"

    "mov       sp, fp" "\n"

    // To enable probes to modify register state, we copy all registers
    // out of the ProbeContext before returning.

    "add       ip, sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_D15_OFFSET + FPREG_SIZE) "\n"
    "vldmdb.64 ip!, { d0-d15 }" "\n"
    "add       ip, sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_R11_OFFSET + GPREG_SIZE) "\n"
    "ldmdb     ip, { r0-r11 }" "\n"
    "ldr       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_FPSCR_OFFSET) "]" "\n"
    "vmsr      FPSCR, ip" "\n"

    // There are 5 more registers left to restore: ip, sp, lr, pc, and apsr.
    // There are 2 issues that complicate the restoration of these last few
    // registers:
    //
    // 1. Normal ARM calling convention relies on moving lr to pc to return to
    //    the caller. In our case, the address to return to is specified by
    //    ProbeContext.cpu.pc. And at that moment, we won't have any available
    //    scratch registers to hold the return address (lr needs to hold
    //    ProbeContext.cpu.lr, not the return address).
    //
    //    The solution is to store the return address on the stack and load the
    //     pc from there.
    //
    // 2. Issue 1 means we will need to write to the stack location at
    //    ProbeContext.cpu.sp - 4. But if the user probe function had  modified
    //    the value of ProbeContext.cpu.sp to point in the range between
    //    &ProbeContext.cpu.ip thru &ProbeContext.cpu.aspr, then the action for
    //    Issue 1 may trash the values to be restored before we can restore
    //    them.
    //
    //    The solution is to check if ProbeContext.cpu.sp contains a value in
    //    the undesirable range. If so, we copy the remaining ProbeContext
    //    register data to a safe range (at memory lower than where
    //    ProbeContext.cpu.sp points) first, and restore the remaining register
    //    from this new range.

    "add       ip, sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_APSR_OFFSET) "\n"
    "ldr       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"
    "cmp       lr, ip" "\n"
    "bgt     " SYMBOL_STRING(ctiMasmProbeTrampolineEnd) "\n"

    // We get here because the new expected stack pointer location is lower
    // than where it's supposed to be. This means the safe range of stack
    // memory where we'll be copying the remaining register restore values to
    // might be in a region of memory below the sp i.e. unallocated stack
    // memory. This in turn makes it vulnerable to interrupts potentially
    // trashing the copied values. To prevent that, we must first allocate the
    // needed stack memory by adjusting the sp before the copying.

    "sub       lr, lr, #(6 * " STRINGIZE_VALUE_OF(PTR_SIZE) 
                         " + " STRINGIZE_VALUE_OF(PROBE_CPU_IP_OFFSET) ")" "\n"

    "mov       ip, sp" "\n"
    "mov       sp, lr" "\n"
    "mov       lr, ip" "\n"

    "ldr       ip, [lr, #" STRINGIZE_VALUE_OF(PROBE_CPU_IP_OFFSET) "]" "\n"
    "str       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_IP_OFFSET) "]" "\n"
    "ldr       ip, [lr, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"
    "str       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"
    "ldr       ip, [lr, #" STRINGIZE_VALUE_OF(PROBE_CPU_LR_OFFSET) "]" "\n"
    "str       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_LR_OFFSET) "]" "\n"
    "ldr       ip, [lr, #" STRINGIZE_VALUE_OF(PROBE_CPU_PC_OFFSET) "]" "\n"
    "str       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_PC_OFFSET) "]" "\n"
    "ldr       ip, [lr, #" STRINGIZE_VALUE_OF(PROBE_CPU_APSR_OFFSET) "]" "\n"
    "str       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_APSR_OFFSET) "]" "\n"

SYMBOL_STRING(ctiMasmProbeTrampolineEnd) ":" "\n"
    "ldr       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_PC_OFFSET) "]" "\n"
    "ldr       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"
    "sub       lr, lr, #" STRINGIZE_VALUE_OF(PTR_SIZE) "\n"
    "str       ip, [lr]" "\n"
    "str       lr, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"

    "ldr       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_APSR_OFFSET) "]" "\n"
    "msr       APSR, ip" "\n"
    "ldr       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_LR_OFFSET) "]" "\n"
    "mov       lr, ip" "\n"
    "ldr       ip, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_IP_OFFSET) "]" "\n"
    "ldr       sp, [sp, #" STRINGIZE_VALUE_OF(PROBE_CPU_SP_OFFSET) "]" "\n"

    "pop       { pc }" "\n"
);
#endif // USE(MASM_PROBE)


#define DEFINE_STUB_FUNCTION(rtype, op) \
    extern "C" { \
        rtype JITStubThunked_##op(STUB_ARGS_DECLARATION); \
    }; \
    asm ( \
        ".globl " SYMBOL_STRING(cti_##op) "\n" \
        INLINE_ARM_FUNCTION(cti_##op) \
        SYMBOL_STRING(cti_##op) ":" "\n" \
        "str lr, [sp, #" STRINGIZE_VALUE_OF(THUNK_RETURN_ADDRESS_OFFSET) "]" "\n" \
        "bl " SYMBOL_STRING(JITStubThunked_##op) "\n" \
        "ldr lr, [sp, #" STRINGIZE_VALUE_OF(THUNK_RETURN_ADDRESS_OFFSET) "]" "\n" \
        "bx lr" "\n" \
        ); \
    rtype JITStubThunked_##op(STUB_ARGS_DECLARATION)

#endif // COMPILER(GCC)

#if COMPILER(RVCT)

__asm EncodedJSValue ctiTrampoline(void*, JSStack*, CallFrame*, void* /*unused1*/, void* /*unused2*/, VM*)
{
    ARM
    stmdb sp!, {r1-r3}
    stmdb sp!, {r4-r6, r8-r11, lr}
    sub sp, sp, # PRESERVEDR4_OFFSET
    mov r5, r2
    mov r6, #512
    mov lr, pc
    bx r0
    add sp, sp, # PRESERVEDR4_OFFSET
    ldmia sp!, {r4-r6, r8-r11, lr}
    add sp, sp, #12
    bx lr
}
__asm void ctiTrampolineEnd()
{
}

__asm void ctiVMThrowTrampoline()
{
    ARM
    PRESERVE8
    mov r0, sp
    bl cti_vm_throw
    add sp, sp, # PRESERVEDR4_OFFSET
    ldmia sp!, {r4-r6, r8-r11, lr}
    add sp, sp, #12
    bx lr
}

__asm void ctiOpThrowNotCaught()
{
    ARM
    add sp, sp, # PRESERVEDR4_OFFSET
    ldmia sp!, {r4-r8, lr}
    add sp, sp, #12
    bx lr
}

#define DEFINE_STUB_FUNCTION(rtype, op) rtype JITStubThunked_##op(STUB_ARGS_DECLARATION)

/* The following is a workaround for RVCT toolchain; precompiler macros are not expanded before the code is passed to the assembler */

/* The following section is a template to generate code for GeneratedJITStubs_RVCT.h */
/* The pattern "#xxx#" will be replaced with "xxx" */

/*
RVCT(extern "C" #rtype# JITStubThunked_#op#(STUB_ARGS_DECLARATION);)
RVCT(__asm #rtype# cti_#op#(STUB_ARGS_DECLARATION))
RVCT({)
RVCT(    PRESERVE8)
RVCT(    IMPORT JITStubThunked_#op#)
RVCT(    str lr, [sp, # THUNK_RETURN_ADDRESS_OFFSET])
RVCT(    bl JITStubThunked_#op#)
RVCT(    ldr lr, [sp, # THUNK_RETURN_ADDRESS_OFFSET])
RVCT(    bx lr)
RVCT(})
RVCT()
*/

/* Include the generated file */
#include "GeneratedJITStubs_RVCT.h"

#endif // COMPILER(RVCT)

#if COMPILER(MSVC)

#define DEFINE_STUB_FUNCTION(rtype, op) extern "C" rtype JITStubThunked_##op(STUB_ARGS_DECLARATION)

/* The following is a workaround for MSVC toolchain; inline assembler is not supported */

/* The following section is a template to generate code for GeneratedJITStubs_MSVC.asm */
/* The pattern "#xxx#" will be replaced with "xxx" */

/*
MSVC_BEGIN(    AREA Trampoline, CODE)
MSVC_BEGIN()
MSVC_BEGIN(    EXPORT ctiTrampoline)
MSVC_BEGIN(    EXPORT ctiTrampolineEnd)
MSVC_BEGIN(    EXPORT ctiVMThrowTrampoline)
MSVC_BEGIN(    EXPORT ctiOpThrowNotCaught)
MSVC_BEGIN()
MSVC_BEGIN(ctiTrampoline PROC)
MSVC_BEGIN(    stmdb sp!, {r1-r3})
MSVC_BEGIN(    stmdb sp!, {r4-r6, r8-r11, lr})
MSVC_BEGIN(    sub sp, sp, #68 ; sync with PRESERVEDR4_OFFSET)
MSVC_BEGIN(    mov r5, r2)
MSVC_BEGIN(    mov r6, #512)
MSVC_BEGIN(    ; r0 contains the code)
MSVC_BEGIN(    mov lr, pc)
MSVC_BEGIN(    bx r0)
MSVC_BEGIN(    add sp, sp, #68 ; sync with PRESERVEDR4_OFFSET)
MSVC_BEGIN(    ldmia sp!, {r4-r6, r8-r11, lr})
MSVC_BEGIN(    add sp, sp, #12)
MSVC_BEGIN(    bx lr)
MSVC_BEGIN(ctiTrampolineEnd)
MSVC_BEGIN(ctiTrampoline ENDP)
MSVC_BEGIN()
MSVC_BEGIN(ctiVMThrowTrampoline PROC)
MSVC_BEGIN(    mov r0, sp)
MSVC_BEGIN(    bl cti_vm_throw)
MSVC_BEGIN(ctiOpThrowNotCaught)
MSVC_BEGIN(    add sp, sp, #68 ; sync with PRESERVEDR4_OFFSET)
MSVC_BEGIN(    ldmia sp!, {r4-r6, r8-r11, lr})
MSVC_BEGIN(    add sp, sp, #12)
MSVC_BEGIN(    bx lr)
MSVC_BEGIN(ctiVMThrowTrampoline ENDP)
MSVC_BEGIN()

MSVC(    EXPORT cti_#op#)
MSVC(    IMPORT JITStubThunked_#op#)
MSVC(cti_#op# PROC)
MSVC(    str lr, [sp, #64] ; sync with THUNK_RETURN_ADDRESS_OFFSET)
MSVC(    bl JITStubThunked_#op#)
MSVC(    ldr lr, [sp, #64] ; sync with THUNK_RETURN_ADDRESS_OFFSET)
MSVC(    bx lr)
MSVC(cti_#op# ENDP)
MSVC()

MSVC_END(    END)
*/
#endif // COMPILER(MSVC)


static void performARMJITAssertions()
{
    ASSERT(OBJECT_OFFSETOF(struct JITStackFrame, thunkReturnAddress) == THUNK_RETURN_ADDRESS_OFFSET);
    ASSERT(OBJECT_OFFSETOF(struct JITStackFrame, preservedR4) == PRESERVEDR4_OFFSET);
}

} // namespace JSC

#endif // JITStubsARM_h