1 | /* Save current context. |
2 | Copyright (C) 2015-2022 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 <sysdep.h> |
20 | #include "ucontext_i.h" |
21 | |
22 | /* int getcontext (ucontext_t *ucp) |
23 | |
24 | Returns 0 on success -1 and errno on failure. |
25 | */ |
26 | .text |
27 | ENTRY(__getcontext) |
28 | stw r16, (UCONTEXT_MCONTEXT + 16*4)(r4) |
29 | stw r17, (UCONTEXT_MCONTEXT + 17*4)(r4) |
30 | stw r18, (UCONTEXT_MCONTEXT + 18*4)(r4) |
31 | stw r19, (UCONTEXT_MCONTEXT + 19*4)(r4) |
32 | stw r20, (UCONTEXT_MCONTEXT + 20*4)(r4) |
33 | stw r21, (UCONTEXT_MCONTEXT + 21*4)(r4) |
34 | stw r22, (UCONTEXT_MCONTEXT + 22*4)(r4) |
35 | stw ra, (UCONTEXT_MCONTEXT + 24*4)(r4) |
36 | stw fp, (UCONTEXT_MCONTEXT + 25*4)(r4) |
37 | stw gp, (UCONTEXT_MCONTEXT + 26*4)(r4) |
38 | /* Store return address at place for EA. */ |
39 | stw ra, (UCONTEXT_MCONTEXT + 28*4)(r4) |
40 | stw sp, (UCONTEXT_MCONTEXT + 29*4)(r4) |
41 | /* Store zero for return success. */ |
42 | stw zero, (UCONTEXT_MCONTEXT + 2*4)(r4) |
43 | |
44 | /* Store value "1" at uc_flags to recognize as getcontext created. */ |
45 | movi r2, 1 |
46 | stw r2, UCONTEXT_FLAGS(r4) |
47 | |
48 | /* Store MCONTEXT_VERSION at first word of mcontext_t. */ |
49 | movi r2, MCONTEXT_VERSION |
50 | stw r2, UCONTEXT_MCONTEXT(r4) |
51 | |
52 | /* Get signal mask. */ |
53 | /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */ |
54 | movi r7, _NSIG8 |
55 | addi r6, r4, UCONTEXT_SIGMASK |
56 | mov r5, zero |
57 | movi r4, SIG_BLOCK |
58 | movi r2, SYS_ify (rt_sigprocmask) |
59 | trap |
60 | bne r7, zero, SYSCALL_ERROR_LABEL |
61 | |
62 | mov r2, zero |
63 | ret |
64 | |
65 | PSEUDO_END(__getcontext) |
66 | weak_alias(__getcontext, getcontext) |
67 | |