129 lines
3.5 KiB
ArmAsm
129 lines
3.5 KiB
ArmAsm
/* Implementation of profiling support. ARM EABI version.
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Copyright (C) 2008-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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/* Don't call mcount when calling mcount... */
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#undef PROF
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#include <sysdep.h>
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#undef mcount
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#ifdef __thumb2__
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.thumb
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#endif
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.syntax unified
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/* Use an assembly stub with a special ABI. The calling lr has been
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pushed to the stack (which will be misaligned). We should preserve
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all registers except ip and pop a word off the stack.
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NOTE: This assumes mcount_internal does not clobber any non-core
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(coprocessor) registers. Currently this is true, but may require
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additional attention in the future.
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The calling sequence looks something like:
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func:
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push {lr}
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bl __gnu_mcount_nc
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<function body>
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*/
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ENTRY(__gnu_mcount_nc)
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push {r0, r1, r2, r3, lr}
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cfi_adjust_cfa_offset (20)
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cfi_rel_offset (r0, 0)
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cfi_rel_offset (r1, 4)
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cfi_rel_offset (r2, 8)
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cfi_rel_offset (r3, 12)
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cfi_rel_offset (lr, 16)
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bic r1, lr, #1
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ldr r0, [sp, #20]
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bl __mcount_internal
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pop {r0, r1, r2, r3, ip, lr}
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cfi_adjust_cfa_offset (-24)
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cfi_restore (r0)
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cfi_restore (r1)
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cfi_restore (r2)
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cfi_restore (r3)
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cfi_register (lr, ip)
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bx ip
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END(__gnu_mcount_nc)
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#include <gcc-compat.h>
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#include <shlib-compat.h>
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/* The new __gnu_mcount_nc entry point was introduced in 4.4, so the
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static library needs the old one only to support older compilers.
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Even in a configuration that only cares about newer compilers, the
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shared library might need it only for strict ABI compatibility. */
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#if GCC_COMPAT (4, 3) || SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)
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/* Provide old mcount for backwards compatibility. This requires
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code be compiled with APCS frame pointers. */
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ENTRY(__mcount_arm_compat)
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push {r0, r1, r2, r3, fp, lr}
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cfi_adjust_cfa_offset (24)
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cfi_rel_offset (r0, 0)
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cfi_rel_offset (r1, 4)
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cfi_rel_offset (r2, 8)
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cfi_rel_offset (r3, 12)
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cfi_rel_offset (fp, 16)
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cfi_rel_offset (lr, 20)
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movs r0, fp
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ittt ne
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ldrne r0, [r0, #-4]
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movsne r1, lr
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blne __mcount_internal
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# if defined (__ARM_ARCH_4T__) && defined (__THUMB_INTERWORK__)
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pop {r0, r1, r2, r3, fp, lr}
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cfi_adjust_cfa_offset (-24)
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cfi_restore (r0)
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cfi_restore (r1)
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cfi_restore (r2)
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cfi_restore (r3)
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cfi_restore (fp)
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cfi_restore (lr)
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bx lr
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# else
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pop {r0, r1, r2, r3, fp, pc}
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# endif
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END(__mcount_arm_compat)
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#endif
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#if GCC_COMPAT (4, 3)
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strong_alias (__mcount_arm_compat, _mcount)
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/* The canonical name for the function is `_mcount' in both C and asm,
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but some old asm code might assume it's `mcount'. */
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weak_alias (_mcount, mcount)
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#elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_19)
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compat_symbol (libc, __mcount_arm_compat, _mcount, GLIBC_2_0)
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strong_alias (__mcount_arm_compat, __mcount_arm_compat_1)
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compat_symbol (libc, __mcount_arm_compat_1, mcount, GLIBC_2_0)
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#endif
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