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glibc/ports/sysdeps/arm/arm-mcount.S
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/* Implementation of profiling support. ARM EABI version. | |
Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc. | |
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/>. */ | |
/* Don't call mcount when calling mcount... */ | |
#undef PROF | |
#include <sysdep.h> | |
#ifdef __thumb2__ | |
.thumb | |
.syntax unified | |
#endif | |
/* Use an assembly stub with a special ABI. The calling lr has been | |
pushed to the stack (which will be misaligned). We should preserve | |
all registers except ip and pop a word off the stack. | |
NOTE: This assumes mcount_internal does not clobber any non-core | |
(coprocessor) registers. Currently this is true, but may require | |
additional attention in the future. | |
The calling sequence looks something like: | |
func: | |
push {lr} | |
bl __gnu_mount_nc | |
<function body> | |
*/ | |
ENTRY(__gnu_mcount_nc) | |
push {r0, r1, r2, r3, lr} | |
cfi_adjust_cfa_offset (20) | |
cfi_rel_offset (r0, 0) | |
cfi_rel_offset (r1, 4) | |
cfi_rel_offset (r2, 8) | |
cfi_rel_offset (r3, 12) | |
cfi_rel_offset (lr, 16) | |
bic r1, lr, #1 | |
ldr r0, [sp, #20] | |
bl __mcount_internal | |
pop {r0, r1, r2, r3, ip, lr} | |
cfi_adjust_cfa_offset (-24) | |
cfi_restore (r0) | |
cfi_restore (r1) | |
cfi_restore (r2) | |
cfi_restore (r3) | |
cfi_register (lr, ip) | |
bx ip | |
END(__gnu_mcount_nc) | |
/* Provide old mcount for backwards compatibility. This requires | |
code be compiled with APCS frame pointers. */ | |
ENTRY(_mcount) | |
stmdb sp!, {r0, r1, r2, r3, fp, lr} | |
cfi_adjust_cfa_offset (24) | |
cfi_rel_offset (r0, 0) | |
cfi_rel_offset (r1, 4) | |
cfi_rel_offset (r2, 8) | |
cfi_rel_offset (r3, 12) | |
cfi_rel_offset (fp, 16) | |
cfi_rel_offset (lr, 20) | |
#ifdef __thumb2__ | |
movs r0, fp | |
ittt ne | |
ldrne r0, [r0, #-4] | |
#else | |
movs fp, fp | |
ldrne r0, [fp, #-4] | |
#endif | |
movnes r1, lr | |
blne __mcount_internal | |
#ifdef __thumb2__ | |
ldmia sp!, {r0, r1, r2, r3, fp, pc} | |
#else | |
ldmia sp!, {r0, r1, r2, r3, fp, lr} | |
cfi_adjust_cfa_offset (-24) | |
cfi_restore (r0) | |
cfi_restore (r1) | |
cfi_restore (r2) | |
cfi_restore (r3) | |
cfi_restore (fp) | |
cfi_restore (lr) | |
bx lr | |
#endif | |
END(_mcount) | |
/* The canonical name for the function is `_mcount' in both C and asm, | |
but some old asm code might assume it's `mcount'. */ | |
#undef mcount | |
weak_alias (_mcount, mcount) |