| 1 | /* Save and set current context for ARC. |
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| 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include "ucontext-macros.h" |
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| 20 | |
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| 21 | /* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp). */ |
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| 22 | |
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| 23 | ENTRY (__swapcontext) |
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| 24 | |
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| 25 | /* Save context into @oucp pointed to by r0. */ |
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| 26 | |
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| 27 | add r2, r0, UCONTEXT_MCONTEXT |
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| 28 | STR (r13, r2, 37) |
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| 29 | STR (r14, r2, 36) |
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| 30 | STR (r15, r2, 35) |
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| 31 | STR (r16, r2, 34) |
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| 32 | STR (r17, r2, 33) |
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| 33 | STR (r18, r2, 32) |
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| 34 | STR (r19, r2, 31) |
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| 35 | STR (r20, r2, 30) |
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| 36 | STR (r21, r2, 29) |
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| 37 | STR (r22, r2, 28) |
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| 38 | STR (r23, r2, 27) |
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| 39 | STR (r24, r2, 26) |
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| 40 | |
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| 41 | STR (blink, r2, 7) |
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| 42 | STR (fp, r2, 8) |
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| 43 | STR (gp, r2, 9) |
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| 44 | STR (sp, r2, 23) |
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| 45 | |
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| 46 | /* Save 0 in r0 placeholder to return 0 when @oucp activated. */ |
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| 47 | mov r9, 0 |
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| 48 | STR (r9, r2, 22) |
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| 49 | |
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| 50 | /* Load context from @ucp. */ |
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| 51 | |
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| 52 | mov r9, r1 /* Safekeep @ucp across syscall. */ |
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| 53 | |
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| 54 | /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */ |
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| 55 | mov r3, _NSIG8 |
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| 56 | add r2, r0, UCONTEXT_SIGMASK |
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| 57 | add r1, r1, UCONTEXT_SIGMASK |
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| 58 | mov r0, SIG_SETMASK |
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| 59 | mov r8, __NR_rt_sigprocmask |
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| 60 | ARC_TRAP_INSN |
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| 61 | brhi r0, -1024, L (call_syscall_err) |
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| 62 | |
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| 63 | add r9, r9, UCONTEXT_MCONTEXT |
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| 64 | LDR (r0, r9, 22) |
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| 65 | LDR (r1, r9, 21) |
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| 66 | LDR (r2, r9, 20) |
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| 67 | LDR (r3, r9, 19) |
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| 68 | LDR (r4, r9, 18) |
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| 69 | LDR (r5, r9, 17) |
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| 70 | LDR (r6, r9, 16) |
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| 71 | LDR (r7, r9, 15) |
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| 72 | |
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| 73 | LDR (r13, r9, 37) |
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| 74 | LDR (r14, r9, 36) |
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| 75 | LDR (r15, r9, 35) |
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| 76 | LDR (r16, r9, 34) |
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| 77 | LDR (r17, r9, 33) |
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| 78 | LDR (r18, r9, 32) |
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| 79 | LDR (r19, r9, 31) |
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| 80 | LDR (r20, r9, 30) |
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| 81 | LDR (r21, r9, 29) |
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| 82 | LDR (r22, r9, 28) |
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| 83 | LDR (r23, r9, 27) |
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| 84 | LDR (r24, r9, 26) |
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| 85 | |
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| 86 | LDR (blink, r9, 7) |
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| 87 | LDR (fp, r9, 8) |
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| 88 | LDR (gp, r9, 9) |
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| 89 | LDR (sp, r9, 23) |
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| 90 | |
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| 91 | j [blink] |
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| 92 | |
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| 93 | PSEUDO_END (__swapcontext) |
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| 94 | weak_alias (__swapcontext, swapcontext) |
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| 95 | |
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