| 1 | /* Save current context for ARC. |
|---|
| 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
|---|
| 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, see |
|---|
| 17 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #include "ucontext-macros.h" |
|---|
| 20 | |
|---|
| 21 | /* int getcontext (ucontext_t *ucp) |
|---|
| 22 | Save machine context in @ucp and return 0 on success, -1 on error |
|---|
| 23 | - saves callee saved registers only |
|---|
| 24 | - layout mandated by uncontext_t:uc_mcontext (hence different from setjmp). */ |
|---|
| 25 | |
|---|
| 26 | ENTRY (__getcontext) |
|---|
| 27 | |
|---|
| 28 | /* Callee saved registers. */ |
|---|
| 29 | add r2, r0, UCONTEXT_MCONTEXT |
|---|
| 30 | STR (r13, r2, 37) |
|---|
| 31 | STR (r14, r2, 36) |
|---|
| 32 | STR (r15, r2, 35) |
|---|
| 33 | STR (r16, r2, 34) |
|---|
| 34 | STR (r17, r2, 33) |
|---|
| 35 | STR (r18, r2, 32) |
|---|
| 36 | STR (r19, r2, 31) |
|---|
| 37 | STR (r20, r2, 30) |
|---|
| 38 | STR (r21, r2, 29) |
|---|
| 39 | STR (r22, r2, 28) |
|---|
| 40 | STR (r23, r2, 27) |
|---|
| 41 | STR (r24, r2, 26) |
|---|
| 42 | |
|---|
| 43 | STR (blink, r2, 7) |
|---|
| 44 | STR (fp, r2, 8) |
|---|
| 45 | STR (gp, r2, 9) |
|---|
| 46 | STR (sp, r2, 23) |
|---|
| 47 | |
|---|
| 48 | /* Save 0 in r0 placeholder to return 0 when this @ucp activated. */ |
|---|
| 49 | mov r9, 0 |
|---|
| 50 | STR (r9, r2, 22) |
|---|
| 51 | |
|---|
| 52 | /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8). */ |
|---|
| 53 | mov r3, _NSIG8 |
|---|
| 54 | add r2, r0, UCONTEXT_SIGMASK |
|---|
| 55 | mov r1, 0 |
|---|
| 56 | mov r0, SIG_BLOCK |
|---|
| 57 | mov r8, __NR_rt_sigprocmask |
|---|
| 58 | ARC_TRAP_INSN |
|---|
| 59 | brhi r0, -1024, L (call_syscall_err) |
|---|
| 60 | j.d [blink] |
|---|
| 61 | mov r0, 0 /* Success, error handled in .Lcall_syscall_err. */ |
|---|
| 62 | |
|---|
| 63 | PSEUDO_END (__getcontext) |
|---|
| 64 | weak_alias (__getcontext, getcontext) |
|---|
| 65 | |
|---|
