| 1 | /* Save current context. |
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| 2 | Copyright (C) 2005-2022 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 __getcontext (ucontext_t *uc); */ |
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| 24 | |
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| 25 | .text |
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| 26 | .align 5 |
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| 27 | ENTRY(__getcontext) |
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| 28 | |
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| 29 | /* Return value of getcontext. R0 is the only register whose |
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| 30 | value is not preserved. */ |
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| 31 | mov #0, r0 |
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| 32 | mov.l r0, @(oR0,r4) |
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| 33 | mov.l r1, @(oR1,r4) |
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| 34 | mov.l r2, @(oR2,r4) |
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| 35 | mov.l r3, @(oR3,r4) |
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| 36 | mov.l r4, @(oR4,r4) |
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| 37 | mov.l r5, @(oR5,r4) |
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| 38 | mov.l r6, @(oR6,r4) |
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| 39 | mov.l r7, @(oR7,r4) |
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| 40 | mov r4, r0 |
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| 41 | add #(oMACL+4), r0 |
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| 42 | sts.l macl, @-r0 |
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| 43 | sts.l mach, @-r0 |
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| 44 | stc.l gbr, @-r0 |
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| 45 | |
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| 46 | /* Save T flag to SR. */ |
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| 47 | movt r1 |
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| 48 | mov.l r1, @-r0 |
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| 49 | sts.l pr, @-r0 |
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| 50 | |
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| 51 | /* The return address of getcontext is the restart pc. */ |
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| 52 | sts.l pr, @-r0 |
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| 53 | |
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| 54 | mov.l r15, @-r0 |
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| 55 | mov.l r14, @-r0 |
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| 56 | mov.l r13, @-r0 |
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| 57 | mov.l r12, @-r0 |
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| 58 | mov.l r11, @-r0 |
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| 59 | mov.l r10, @-r0 |
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| 60 | mov.l r9, @-r0 |
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| 61 | mov.l r8, @-r0 |
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| 62 | |
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| 63 | /* sigprocmask (SIG_BLOCK, NULL, &uc->uc_sigmask). */ |
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| 64 | mov r4, r6 |
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| 65 | add #oSIGMASK, r6 |
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| 66 | mov #SIG_BLOCK, r4 |
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| 67 | mov #0, r5 |
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| 68 | mov #+SYS_ify(sigprocmask), r3 |
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| 69 | trapa #0x13 |
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| 70 | mov r0, r1 |
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| 71 | mov #-12, r2 |
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| 72 | shad r2, r1 |
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| 73 | not r1, r1 // r1=0 means r0 = -1 to -4095 |
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| 74 | tst r1, r1 // i.e. error in linux |
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| 75 | bf .Lgetcontext_end |
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| 76 | .Lsyscall_error: |
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| 77 | SYSCALL_ERROR_HANDLER |
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| 78 | .Lgetcontext_end: |
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| 79 | /* All done, return 0 for success. */ |
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| 80 | mov #0, r0 |
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| 81 | .Lpseudo_end: |
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| 82 | rts |
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| 83 | nop |
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| 84 | |
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| 85 | PSEUDO_END(__getcontext) |
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| 86 | |
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| 87 | weak_alias (__getcontext, getcontext) |
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| 88 | |
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