/* Machine-specific calling sequence for `mcount' profiling function. x86-64 version. Copyright (C) 2002-2012 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 #ifdef PIC call C_SYMBOL_NAME(__mcount_internal)@PLT #else call C_SYMBOL_NAME(__mcount_internal) #endif /* 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 #ifdef PIC call C_SYMBOL_NAME(__mcount_internal)@PLT #else call C_SYMBOL_NAME(__mcount_internal) #endif /* 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__))