mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 17:11:06 +00:00
5cdc3d9db0
[BZ #19490] * sysdeps/x86_64/_mcount.S (_mcount): Add unwind descriptor. (__fentry__): Likewise
126 lines
3.5 KiB
ArmAsm
126 lines
3.5 KiB
ArmAsm
/* 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>
|
|
|
|
ENTRY(_mcount)
|
|
/* Allocate space for 7 registers. */
|
|
subq $56,%rsp
|
|
cfi_adjust_cfa_offset (56)
|
|
movq %rax,(%rsp)
|
|
cfi_rel_offset (rax, 0)
|
|
movq %rcx,8(%rsp)
|
|
cfi_rel_offset (rcx, 8)
|
|
movq %rdx,16(%rsp)
|
|
cfi_rel_offset (rdx, 16)
|
|
movq %rsi,24(%rsp)
|
|
cfi_rel_offset (rsi, 24)
|
|
movq %rdi,32(%rsp)
|
|
cfi_rel_offset (rdi, 32)
|
|
movq %r8,40(%rsp)
|
|
cfi_rel_offset (r8, 40)
|
|
movq %r9,48(%rsp)
|
|
cfi_rel_offset (r9, 48)
|
|
|
|
/* 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
|
|
cfi_restore (r9)
|
|
movq 40(%rsp),%r8
|
|
cfi_restore (r8)
|
|
movq 32(%rsp),%rdi
|
|
cfi_restore (rdi)
|
|
movq 24(%rsp),%rsi
|
|
cfi_restore (rsi)
|
|
movq 16(%rsp),%rdx
|
|
cfi_restore (rdx)
|
|
movq 8(%rsp),%rcx
|
|
cfi_restore (rcx)
|
|
movq (%rsp),%rax
|
|
cfi_restore (rax)
|
|
addq $56,%rsp
|
|
cfi_adjust_cfa_offset (-56)
|
|
ret
|
|
END(_mcount)
|
|
|
|
#undef mcount
|
|
weak_alias (_mcount, mcount)
|
|
|
|
/* __fentry__ is different from _mcount in that it is called before
|
|
function prolog. This means (among other things) that it has non-standard
|
|
stack alignment on entry: (%RSP & 0xF) == 0. */
|
|
|
|
ENTRY(__fentry__)
|
|
/* Allocate space for 7 registers
|
|
(+8 bytes for proper stack alignment). */
|
|
subq $64,%rsp
|
|
cfi_adjust_cfa_offset (64)
|
|
movq %rax,(%rsp)
|
|
cfi_rel_offset (rax, 0)
|
|
movq %rcx,8(%rsp)
|
|
cfi_rel_offset (rcx, 8)
|
|
movq %rdx,16(%rsp)
|
|
cfi_rel_offset (rdx, 16)
|
|
movq %rsi,24(%rsp)
|
|
cfi_rel_offset (rsi, 24)
|
|
movq %rdi,32(%rsp)
|
|
cfi_rel_offset (rdi, 32)
|
|
movq %r8,40(%rsp)
|
|
cfi_rel_offset (r8, 40)
|
|
movq %r9,48(%rsp)
|
|
cfi_rel_offset (r9, 48)
|
|
|
|
/* 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
|
|
cfi_restore (r9)
|
|
movq 40(%rsp),%r8
|
|
cfi_restore (r8)
|
|
movq 32(%rsp),%rdi
|
|
cfi_restore (rdi)
|
|
movq 24(%rsp),%rsi
|
|
cfi_restore (rsi)
|
|
movq 16(%rsp),%rdx
|
|
cfi_restore (rdx)
|
|
movq 8(%rsp),%rcx
|
|
cfi_restore (rcx)
|
|
movq (%rsp),%rax
|
|
cfi_restore (rax)
|
|
addq $64,%rsp
|
|
cfi_adjust_cfa_offset (-64)
|
|
ret
|
|
END(__fentry__)
|