| 1 | /* longjmp with sp check for C-SKY ABIV2. |
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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 | .section .rodata.str1.8,"aMS" ,@progbits,1 |
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| 22 | .align 2 |
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| 23 | .type longjmp_msg,@object |
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| 24 | longjmp_msg: |
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| 25 | .string "longjmp causes uninitialized stack frame" |
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| 26 | .size longjmp_msg, .-longjmp_msg |
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| 27 | |
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| 28 | .text |
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| 29 | #define __longjmp ____longjmp_chk |
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| 30 | |
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| 31 | #ifdef __PIC__ |
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| 32 | # define CALL_FAIL \ |
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| 33 | subi sp, 8; \ |
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| 34 | stw gb, (sp, 0); \ |
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| 35 | grs gb, .Lgetpc1; \ |
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| 36 | .Lgetpc1: \ |
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| 37 | lrw t0, .Lgetpc1@GOTPC; \ |
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| 38 | addu gb, gb, t0; \ |
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| 39 | lrw a0, longjmp_msg@GOTOFF; \ |
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| 40 | addu a0, a0, gb; \ |
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| 41 | lrw t0, (HIDDEN_JUMPTARGET (__fortify_fail))@PLT; \ |
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| 42 | ldr.w t0, (gb, t0 << 0); \ |
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| 43 | jsr t0; \ |
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| 44 | ldw gb, (sp, 0); \ |
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| 45 | addi sp, 8; |
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| 46 | #else /* __PIC__ */ |
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| 47 | # define CALL_FAIL \ |
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| 48 | lrw a0, longjmp_msg; \ |
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| 49 | jsri HIDDEN_JUMPTARGET (__fortify_fail); |
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| 50 | #endif /* __PIC__ */ |
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| 51 | |
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| 52 | # define CHECK_SP(reg) \ |
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| 53 | cmplt sp, reg; \ |
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| 54 | bt .Lok1; \ |
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| 55 | mov r9, a0; \ |
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| 56 | mov t0, r7; \ |
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| 57 | lrw r7, __NR_sigaltstack; \ |
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| 58 | movi a0, 0; \ |
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| 59 | subi sp, 12; /* sizeof (stack_t) */ \ |
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| 60 | mov a1, sp; \ |
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| 61 | trap 0; \ |
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| 62 | mov r7, t0; \ |
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| 63 | cmpnei a0, 0; \ |
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| 64 | bt .Lok; \ |
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| 65 | ldw a1, (sp, 4); \ |
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| 66 | btsti a1, 1; \ |
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| 67 | bt .Lfail; \ |
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| 68 | ldw a1, (sp, 0); \ |
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| 69 | ldw a3, (sp, 8); \ |
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| 70 | add a1, a3; \ |
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| 71 | sub a1, reg; \ |
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| 72 | cmphs a1, a3; \ |
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| 73 | bt .Lok; \ |
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| 74 | .Lfail: \ |
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| 75 | addi sp, 12; \ |
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| 76 | CALL_FAIL \ |
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| 77 | .Lok: \ |
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| 78 | mov a0, r9; \ |
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| 79 | .Lok1: |
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| 80 | |
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| 81 | #include <__longjmp.S> |
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| 82 | |
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