| /* Implementation of profiling support. ARM EABI version. |
| Copyright (C) 2008-2016 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 |
| sfi_breg r0, \ |
| ldrne r0, [\B, #-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 |