129 lines
3.5 KiB
ArmAsm
129 lines
3.5 KiB
ArmAsm
|
/* Implementation of profiling support. ARM EABI version.
|
||
|
|
Copyright (C) 2008-2022 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
|
||
|
|
<https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
/* Don't call mcount when calling mcount... */
|
||
|
|
#undef PROF
|
||
|
|
|
||
|
|
#include <sysdep.h>
|
||
|
|
|
||
|
|
#undef mcount
|
||
|
|
|
||
|
|
#ifdef __thumb2__
|
||
|
|
.thumb
|
||
|
|
#endif
|
||
|
|
.syntax unified
|
||
|
|
|
||
|
|
|
||
|
|
/* 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_mcount_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)
|
||
|
|
|
||
|
|
|
||
|
|
#include <gcc-compat.h>
|
||
|
|
#include <shlib-compat.h>
|
||
|
|
|
||
|
|
/* The new __gnu_mcount_nc entry point was introduced in 4.4, so the
|
||
|
|
static library needs the old one only to support older compilers.
|
||
|
|
Even in a configuration that only cares about newer compilers, the
|
||
|
|
shared library might need it only for strict ABI compatibility. */
|
||
|
|
|
||
|
|
#if GCC_COMPAT (4, 3) || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)
|
||
|
|
|
||
|
|
/* Provide old mcount for backwards compatibility. This requires
|
||
|
|
code be compiled with APCS frame pointers. */
|
||
|
|
|
||
|
|
ENTRY(__mcount_arm_compat)
|
||
|
|
push {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)
|
||
|
|
movs r0, fp
|
||
|
|
ittt ne
|
||
|
|
ldrne r0, [r0, #-4]
|
||
|
|
movsne r1, lr
|
||
|
|
blne __mcount_internal
|
||
|
|
# if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)
|
||
|
|
pop {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
|
||
|
|
# else
|
||
|
|
pop {r0, r1, r2, r3, fp, pc}
|
||
|
|
# endif
|
||
|
|
END(__mcount_arm_compat)
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if GCC_COMPAT (4, 3)
|
||
|
|
|
||
|
|
strong_alias (__mcount_arm_compat, _mcount)
|
||
|
|
|
||
|
|
/* The canonical name for the function is `_mcount' in both C and asm,
|
||
|
|
but some old asm code might assume it's `mcount'. */
|
||
|
|
weak_alias (_mcount, mcount)
|
||
|
|
|
||
|
|
#elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)
|
||
|
|
|
||
|
|
compat_symbol (libc, __mcount_arm_compat, _mcount, GLIBC_2_0)
|
||
|
|
|
||
|
|
strong_alias (__mcount_arm_compat, __mcount_arm_compat_1)
|
||
|
|
compat_symbol (libc, __mcount_arm_compat_1, mcount, GLIBC_2_0)
|
||
|
|
|
||
|
|
#endif
|