projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 2423dc24 | 1 | /* Implementation of profiling support. ARM EABI version. |
| 01b32e73 | 2 | Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc. |
| 2423dc24 TS |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | /* Don't call mcount when calling mcount... */ | |
| 21 | #undef PROF | |
| 22 | ||
| 23 | #include <sysdep.h> | |
| 24 | ||
| 25 | ||
| 26 | #ifdef __thumb2__ | |
| 27 | .thumb | |
| 28 | .syntax unified | |
| 29 | #endif | |
| 30 | ||
| 31 | ||
| 32 | /* Use an assembly stub with a special ABI. The calling lr has been | |
| 33 | pushed to the stack (which will be misaligned). We should preserve | |
| 34 | all registers except ip and pop a word off the stack. | |
| 35 | ||
| 36 | NOTE: This assumes mcount_internal does not clobber any non-core | |
| 37 | (coprocessor) registers. Currently this is true, but may require | |
| 38 | additional attention in the future. | |
| 39 | ||
| 40 | The calling sequence looks something like: | |
| 41 | func: | |
| 42 | push {lr} | |
| 43 | bl __gnu_mount_nc | |
| 44 | <function body> | |
| 45 | */ | |
| 46 | ||
| 47 | ENTRY(__gnu_mcount_nc) | |
| 48 | push {r0, r1, r2, r3, lr} | |
| 01b32e73 TS |
49 | cfi_adjust_cfa_offset (20) |
| 50 | cfi_rel_offset (r0, 0) | |
| 51 | cfi_rel_offset (r1, 4) | |
| 52 | cfi_rel_offset (r2, 8) | |
| 53 | cfi_rel_offset (r3, 12) | |
| 54 | cfi_rel_offset (lr, 16) | |
| 2423dc24 TS |
55 | bic r1, lr, #1 |
| 56 | ldr r0, [sp, #20] | |
| 57 | bl __mcount_internal | |
| 58 | pop {r0, r1, r2, r3, ip, lr} | |
| 01b32e73 TS |
59 | cfi_adjust_cfa_offset (-24) |
| 60 | cfi_restore (r0) | |
| 61 | cfi_restore (r1) | |
| 62 | cfi_restore (r2) | |
| 63 | cfi_restore (r3) | |
| 64 | cfi_register (lr, ip) | |
| 2423dc24 TS |
65 | bx ip |
| 66 | END(__gnu_mcount_nc) | |
| 67 | ||
| 68 | ||
| 69 | /* Provide old mcount for backwards compatibility. This requires | |
| 70 | code be compiled with APCS frame pointers. */ | |
| 71 | ||
| 72 | ENTRY(_mcount) | |
| 73 | stmdb sp!, {r0, r1, r2, r3, fp, lr} | |
| 01b32e73 TS |
74 | cfi_adjust_cfa_offset (24) |
| 75 | cfi_rel_offset (r0, 0) | |
| 76 | cfi_rel_offset (r1, 4) | |
| 77 | cfi_rel_offset (r2, 8) | |
| 78 | cfi_rel_offset (r3, 12) | |
| 79 | cfi_rel_offset (fp, 16) | |
| 80 | cfi_rel_offset (lr, 20) | |
| 2423dc24 TS |
81 | #ifdef __thumb2__ |
| 82 | movs r0, fp | |
| 83 | ittt ne | |
| 84 | ldrne r0, [r0, #-4] | |
| 85 | #else | |
| 86 | movs fp, fp | |
| 87 | ldrne r0, [fp, #-4] | |
| 88 | #endif | |
| 89 | movnes r1, lr | |
| 90 | blne __mcount_internal | |
| 91 | #ifdef __thumb2__ | |
| 92 | ldmia sp!, {r0, r1, r2, r3, fp, pc} | |
| 93 | #else | |
| 94 | ldmia sp!, {r0, r1, r2, r3, fp, lr} | |
| 01b32e73 TS |
95 | cfi_adjust_cfa_offset (-24) |
| 96 | cfi_restore (r0) | |
| 97 | cfi_restore (r1) | |
| 98 | cfi_restore (r2) | |
| 99 | cfi_restore (r3) | |
| 100 | cfi_restore (fp) | |
| 101 | cfi_restore (lr) | |
| 2423dc24 TS |
102 | bx lr |
| 103 | #endif | |
| 104 | END(_mcount) | |
| 105 | ||
| 106 | /* The canonical name for the function is `_mcount' in both C and asm, | |
| 107 | but some old asm code might assume it's `mcount'. */ | |
| 108 | #undef mcount | |
| 109 | weak_alias (_mcount, mcount) |