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glibc/sysdeps/x86_64/_mcount.S
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| /* Machine-specific calling sequence for `mcount' profiling function. x86-64 version. | |
| Copyright (C) 2002-2016 Free Software Foundation, Inc. | |
| Contributed by Andreas Jaeger <aj@suse.de>. | |
| This file is part of the GNU C Library. | |
| The GNU C Library is free software; you can redistribute it and/or | |
| modify it under the terms of the GNU Lesser General Public | |
| License as published by the Free Software Foundation; either | |
| version 2.1 of the License, or (at your option) any later version. | |
| The GNU C Library is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| Lesser General Public License for more details. | |
| You should have received a copy of the GNU Lesser General Public | |
| License along with the GNU C Library; if not, see | |
| <http://www.gnu.org/licenses/>. */ | |
| /* Assembly stub to invoke _mcount(). Compiler generated code calls | |
| this stub after executing a function's prologue and without saving any | |
| registers. It is therefore necessary to preserve %rcx, %rdx, %rsi, %rdi, | |
| %r8, %r9 as they may contain function arguments. */ | |
| #include <sysdep.h> | |
| .globl C_SYMBOL_NAME(_mcount) | |
| .type C_SYMBOL_NAME(_mcount), @function | |
| .align ALIGNARG(4) | |
| C_LABEL(_mcount) | |
| /* Allocate space for 7 registers. */ | |
| subq $56,%rsp | |
| movq %rax,(%rsp) | |
| movq %rcx,8(%rsp) | |
| movq %rdx,16(%rsp) | |
| movq %rsi,24(%rsp) | |
| movq %rdi,32(%rsp) | |
| movq %r8,40(%rsp) | |
| movq %r9,48(%rsp) | |
| /* Setup parameter for __mcount_internal. */ | |
| /* selfpc is the return address on the stack. */ | |
| movq 56(%rsp),%rsi | |
| /* Get frompc via the frame pointer. */ | |
| movq 8(%rbp),%rdi | |
| call C_SYMBOL_NAME(__mcount_internal) | |
| /* Pop the saved registers. Please note that `mcount' has no | |
| return value. */ | |
| movq 48(%rsp),%r9 | |
| movq 40(%rsp),%r8 | |
| movq 32(%rsp),%rdi | |
| movq 24(%rsp),%rsi | |
| movq 16(%rsp),%rdx | |
| movq 8(%rsp),%rcx | |
| movq (%rsp),%rax | |
| addq $56,%rsp | |
| ret | |
| ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount)) | |
| #undef mcount | |
| weak_alias (_mcount, mcount) | |
| .globl C_SYMBOL_NAME(__fentry__) | |
| .type C_SYMBOL_NAME(__fentry__), @function | |
| .align ALIGNARG(4) | |
| C_LABEL(__fentry__) | |
| /* Allocate space for 7 registers. */ | |
| subq $64,%rsp | |
| movq %rax,(%rsp) | |
| movq %rcx,8(%rsp) | |
| movq %rdx,16(%rsp) | |
| movq %rsi,24(%rsp) | |
| movq %rdi,32(%rsp) | |
| movq %r8,40(%rsp) | |
| movq %r9,48(%rsp) | |
| /* Setup parameter for __mcount_internal. */ | |
| /* selfpc is the return address on the stack. */ | |
| movq 64(%rsp),%rsi | |
| /* caller is the return address above it */ | |
| movq 72(%rsp),%rdi | |
| call C_SYMBOL_NAME(__mcount_internal) | |
| /* Pop the saved registers. Please note that `__fentry__' has no | |
| return value. */ | |
| movq 48(%rsp),%r9 | |
| movq 40(%rsp),%r8 | |
| movq 32(%rsp),%rdi | |
| movq 24(%rsp),%rsi | |
| movq 16(%rsp),%rdx | |
| movq 8(%rsp),%rcx | |
| movq (%rsp),%rax | |
| addq $64,%rsp | |
| ret | |
| ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) |