diff options
Diffstat (limited to 'sysdeps/x86_64/_mcount.S')
| -rw-r--r-- | sysdeps/x86_64/_mcount.S | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/x86_64/_mcount.S b/sysdeps/x86_64/_mcount.S new file mode 100644 index 0000000000..c8fe441993 --- /dev/null +++ b/sysdeps/x86_64/_mcount.S @@ -0,0 +1,67 @@ +/* Machine-specific calling sequence for `mcount' profiling function. x86-64 version. + Copyright (C) 2002 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* 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> + + ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount) + ASM_TYPE_DIRECTIVE(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 48(%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 ($rsp),%r9 + movq 8($rsp),%r8 + movq 16($rsp),%rdi + movq 24($rsp),%rsi + movq 32($rsp),%rdx + movq 40($rsp),%rcx + movq 48($rsp),%rax + addq $56,$rsp + ret + + ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount)) + +#undef mcount +weak_alias(_mcount, mcount) |