/* Implementation of profiling support. ARM EABI version. Copyright (C) 2008-2017 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> #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