| //===-- xray_trampoline_x86.s -----------------------------------*- ASM -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of XRay, a dynamic runtime instrumentation system. |
| // |
| // This implements the X86-specific assembler for the trampolines. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| .text |
| .file "xray_trampoline_x86.S" |
| .globl __xray_FunctionEntry |
| .align 16, 0x90 |
| .type __xray_FunctionEntry,@function |
| |
| __xray_FunctionEntry: |
| .cfi_startproc |
| // Save caller provided registers before doing any actual work. |
| pushq %rbp |
| .cfi_def_cfa_offset 16 |
| subq $72, %rsp |
| movq %rdi, 64(%rsp) |
| movq %rax, 56(%rsp) |
| movq %rdx, 48(%rsp) |
| movq %rsi, 40(%rsp) |
| movq %rcx, 32(%rsp) |
| movq %r8, 24(%rsp) |
| movq %r9, 16(%rsp) |
| |
| // de-mangled, that's __xray::XRayPatchedFunction, and we're doing an acquire |
| // load (on x86 is a normal mov instruction). |
| movq _ZN6__xray19XRayPatchedFunctionE(%rip), %rax |
| testq %rax, %rax |
| je .Ltmp0 |
| |
| // assume that %r10d has the function id. |
| movl %r10d, %edi |
| xor %esi,%esi |
| callq *%rax |
| .Ltmp0: |
| // restore the registers |
| movq 64(%rsp), %rdi |
| movq 56(%rsp), %rax |
| movq 48(%rsp), %rdx |
| movq 40(%rsp), %rsi |
| movq 32(%rsp), %rcx |
| movq 24(%rsp), %r8 |
| movq 16(%rsp), %r9 |
| addq $72, %rsp |
| popq %rbp |
| retq |
| .Ltmp1: |
| .size __xray_FunctionEntry, .Ltmp1-__xray_FunctionEntry |
| .cfi_endproc |
| |
| .globl __xray_FunctionExit |
| .align 16, 0x90 |
| .type __xray_FunctionExit,@function |
| __xray_FunctionExit: |
| .cfi_startproc |
| // Save the important registers first. Since we're assuming that this |
| // function is only jumped into, we only preserve the registers for |
| // returning. |
| // FIXME: Figure out whether this is sufficient. |
| pushq %rbp |
| .cfi_def_cfa_offset 16 |
| subq $24, %rsp |
| .cfi_def_cfa_offset 32 |
| movq %rax, 16(%rsp) |
| movq %rdx, 8(%rsp) |
| movq _ZN6__xray19XRayPatchedFunctionE(%rip), %rax |
| testq %rax,%rax |
| je .Ltmp2 |
| |
| movl %r10d, %edi |
| movl $1, %esi |
| callq *%rax |
| .Ltmp2: |
| // Restore the important registers. |
| movq 16(%rsp), %rax |
| movq 8(%rsp), %rdx |
| addq $24, %rsp |
| popq %rbp |
| retq |
| .Ltmp3: |
| .size __xray_FunctionExit, .Ltmp3-__xray_FunctionExit |
| .cfi_endproc |
