| 1 | /* Save and set current context. C-SKY ABIV2 version. |
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| 2 | Copyright (C) 2018-2024 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 <sysdep.h> |
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| 20 | |
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| 21 | #include "ucontext_i.h" |
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| 22 | |
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| 23 | /* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ |
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| 24 | |
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| 25 | ENTRY (swapcontext) |
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| 26 | /* Save params and lr. */ |
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| 27 | subi sp, 16 |
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| 28 | stw a0, (sp, 0) |
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| 29 | stw a1, (sp, 4) |
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| 30 | stw r15, (sp, 8) |
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| 31 | |
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| 32 | /* Call getcontext. */ |
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| 33 | #ifdef __PIC__ |
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| 34 | grs t1, .Lgetpc1 |
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| 35 | .Lgetpc1: |
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| 36 | lrw t0, .Lgetpc1@GOTPC |
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| 37 | addu t1, t1, t0 |
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| 38 | lrw t0, __getcontext@GOT |
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| 39 | ldr.w t0, (t1, t0 << 0) |
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| 40 | jsr t0 |
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| 41 | #else /* !__PIC__ */ |
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| 42 | jsri __getcontext |
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| 43 | #endif |
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| 44 | |
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| 45 | mov a3, a0 /* Save return value. */ |
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| 46 | |
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| 47 | /* Restore params and lr. */ |
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| 48 | ldw a0, (sp, 0) |
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| 49 | ldw a1, (sp, 4) |
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| 50 | ldw r15, (sp, 8) |
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| 51 | addi sp, 16 |
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| 52 | |
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| 53 | cmpnei a3, 0 |
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| 54 | bt error_exit |
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| 55 | |
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| 56 | /* Fix up LR and the PC. */ |
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| 57 | stw sp, (a0, MCONTEXT_CSKY_SP) |
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| 58 | stw r15, (a0, MCONTEXT_CSKY_LR) |
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| 59 | stw r15, (a0, MCONTEXT_CSKY_PC) |
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| 60 | |
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| 61 | /* Set setcontext's arg. */ |
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| 62 | mov a0, a1 |
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| 63 | |
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| 64 | #ifdef __PIC__ |
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| 65 | grs t1, .Lgetpc2 |
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| 66 | .Lgetpc2: |
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| 67 | lrw a3, .Lgetpc2@GOTPC |
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| 68 | addu t1, t1, a3 |
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| 69 | lrw a3, __setcontext@GOT |
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| 70 | ldr.w a3, (t1, a3 << 0) |
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| 71 | #else /* __PIC__ */ |
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| 72 | lrw a3, __setcontext |
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| 73 | #endif /* __PIC__ */ |
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| 74 | jmp a3 |
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| 75 | |
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| 76 | error_exit: |
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| 77 | jmp r15 |
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| 78 | END (swapcontext) |
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| 79 | |
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