x86-64 mcount implementation

This commit is contained in:
Andreas Jaeger 2002-08-21 07:52:27 +00:00
parent c761cdf5a0
commit 0bbade1c7a
2 changed files with 106 additions and 0 deletions

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sysdeps/x86_64/_mcount.S Normal file
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/* 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)

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/* x86-64-specific implementation of profiling support.
Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 2002.
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. */
#include <sysdep.h>
/* We need a special version of the `mcount' function since for x86-64
so that we do not use __builtin_return_address (N) and avoid
clobbering of register. */
/* We must not pollute the global namespace. */
#define mcount_internal __mcount_internal
void mcount_internal (u_long frompc, u_long selfpc);
#define _MCOUNT_DECL(frompc, selfpc) \
void mcount_internal (u_long frompc, u_long selfpc)
/* Define MCOUNT as empty since we have the implementation in another
file. */
#define MCOUNT