projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 688903eb | 1 | /* Copyright (C) 1999-2018 Free Software Foundation, Inc. |
| f10eff58 DJ |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 5 | modify it under the terms of the GNU Lesser General Public | |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 8 | ||
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public | |
| ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ | |
| f10eff58 DJ |
17 | |
| 18 | #include <sysdep.h> | |
| f10eff58 | 19 | |
| de96d148 DJ |
20 | /* If no SA_RESTORER function was specified by the application we use |
| 21 | one of these. This avoids the need for the kernel to synthesise a return | |
| 02a9f771 | 22 | instruction on the stack, which would involve expensive cache flushes. |
| f10eff58 | 23 | |
| 02a9f771 DJ |
24 | Nowadays (2.6 series, and somewhat earlier) the kernel uses a high page |
| 25 | for signal trampolines, so the cache flushes are not an issue. But since | |
| 26 | we do not have a vDSO, continue to use these so that we can provide | |
| 27 | unwind information. | |
| 28 | ||
| 29 | Start the unwind tables at least one instruction before the signal | |
| 30 | trampoline, because the unwinder will assume we are returning after | |
| 2272ffc1 | 31 | a call site. */ |
| 99e5e16c | 32 | |
| 01b32e73 TS |
33 | /* Used in ENTRY. */ |
| 34 | #undef cfi_startproc | |
| 35 | #define cfi_startproc \ | |
| 36 | .cfi_startproc simple; \ | |
| 37 | .cfi_signal_frame | |
| 38 | ||
| 39 | /* The CFA is not computed / used correctly here; this is neither trivial to | |
| 40 | do, nor is it needed. */ | |
| 41 | #define CFI \ | |
| 42 | cfi_def_cfa (sp, 0); \ | |
| 43 | cfi_offset (r0, OFFSET + 0 * 4); \ | |
| 44 | cfi_offset (r1, OFFSET + 1 * 4); \ | |
| 45 | cfi_offset (r2, OFFSET + 2 * 4); \ | |
| 46 | cfi_offset (r3, OFFSET + 3 * 4); \ | |
| 47 | cfi_offset (r4, OFFSET + 4 * 4); \ | |
| 48 | cfi_offset (r5, OFFSET + 5 * 4); \ | |
| 49 | cfi_offset (r6, OFFSET + 6 * 4); \ | |
| 50 | cfi_offset (r7, OFFSET + 7 * 4); \ | |
| 51 | cfi_offset (r8, OFFSET + 8 * 4); \ | |
| 52 | cfi_offset (r9, OFFSET + 9 * 4); \ | |
| 53 | cfi_offset (r10, OFFSET + 10 * 4); \ | |
| 54 | cfi_offset (r11, OFFSET + 11 * 4); \ | |
| 55 | cfi_offset (r12, OFFSET + 12 * 4); \ | |
| 56 | cfi_offset (r13, OFFSET + 13 * 4); \ | |
| 57 | cfi_offset (r14, OFFSET + 14 * 4); \ | |
| 58 | cfi_offset (r15, OFFSET + 15 * 4) | |
| 59 | ||
| 01b32e73 | 60 | #define OFFSET 32 |
| 99e5e16c DJ |
61 | .fnstart |
| 62 | .save {r0-r15} | |
| 01b32e73 | 63 | .pad #OFFSET |
| 99e5e16c | 64 | nop |
| 2272ffc1 | 65 | ENTRY(__default_sa_restorer) |
| 01b32e73 | 66 | CFI |
| de96d148 DJ |
67 | mov r7, $SYS_ify(sigreturn) |
| 68 | swi 0x0 | |
| 02a9f771 | 69 | .fnend |
| 2272ffc1 | 70 | END(__default_sa_restorer) |
| 01b32e73 | 71 | #undef OFFSET |
| 99e5e16c | 72 | |
| 01b32e73 | 73 | #define OFFSET 160 |
| 99e5e16c DJ |
74 | .fnstart |
| 75 | .save {r0-r15} | |
| 01b32e73 | 76 | .pad #OFFSET |
| 99e5e16c | 77 | nop |
| 2272ffc1 | 78 | ENTRY(__default_rt_sa_restorer) |
| 01b32e73 | 79 | CFI |
| de96d148 DJ |
80 | mov r7, $SYS_ify(rt_sigreturn) |
| 81 | swi 0x0 | |
| 02a9f771 | 82 | .fnend |
| 2272ffc1 | 83 | END(__default_rt_sa_restorer) |
| 01b32e73 | 84 | #undef OFFSET |