Changeset View
Changeset View
Standalone View
Standalone View
lib/xray/xray_trampoline_x86.S
- This file was added.
| //===-- 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 | |||||