| 1 | /* Copyright (C) 2009-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <sysdep.h> |
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| 19 | |
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| 20 | .section .rodata.str1.1,"aMS" ,%progbits,1 |
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| 21 | .type longjmp_msg,%object |
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| 22 | longjmp_msg: |
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| 23 | .string "longjmp causes uninitialized stack frame" |
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| 24 | .size longjmp_msg, .-longjmp_msg |
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| 25 | .text |
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| 26 | |
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| 27 | #define __longjmp ____longjmp_chk |
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| 28 | |
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| 29 | #ifdef PIC |
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| 30 | # define CALL_FAIL \ |
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| 31 | ldr sl, .L_GOT; \ |
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| 32 | cfi_undefined (sl); \ |
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| 33 | .L_GOT_OFF: \ |
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| 34 | add sl, pc, sl; \ |
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| 35 | ldr r0, .Lstr; \ |
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| 36 | add r0, sl, r0; \ |
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| 37 | B PLTJMP(HIDDEN_JUMPTARGET(__fortify_fail)); \ |
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| 38 | .L_GOT: \ |
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| 39 | .word _GLOBAL_OFFSET_TABLE_-(.L_GOT_OFF+8); \ |
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| 40 | .Lstr: \ |
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| 41 | .word longjmp_msg(GOTOFF); |
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| 42 | #else |
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| 43 | # define CALL_FAIL \ |
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| 44 | ldr r0, .Lstr; \ |
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| 45 | B HIDDEN_JUMPTARGET(__fortify_fail); \ |
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| 46 | .Lstr: \ |
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| 47 | .word longjmp_msg; |
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| 48 | #endif |
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| 49 | |
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| 50 | #define CHECK_SP(reg) \ |
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| 51 | cfi_remember_state; \ |
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| 52 | cmp sp, reg; \ |
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| 53 | bls .Lok; \ |
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| 54 | push { r7 }; \ |
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| 55 | cfi_adjust_cfa_offset (4); \ |
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| 56 | cfi_rel_offset (r7, 0); \ |
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| 57 | mov r5, r0; \ |
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| 58 | cfi_undefined (r5); \ |
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| 59 | mov r7, #SYS_ify(sigaltstack); \ |
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| 60 | mov r0, #0; \ |
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| 61 | sub sp, sp, #12; /* == sizeof (stack_t) */ \ |
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| 62 | cfi_adjust_cfa_offset (12); \ |
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| 63 | cfi_remember_state; \ |
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| 64 | mov r1, sp; \ |
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| 65 | swi #0; \ |
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| 66 | cmp r0, #0; \ |
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| 67 | bne .Lok2; \ |
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| 68 | ldr r1, [sp, #4]; \ |
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| 69 | tst r1, #1; \ |
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| 70 | beq .Lfail; \ |
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| 71 | ldr r2, [sp, #0]; \ |
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| 72 | ldr r3, [sp, #8]; \ |
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| 73 | add r2, r2, r3; \ |
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| 74 | sub r2, r2, reg; \ |
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| 75 | cmp r3, r2; \ |
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| 76 | bls .Lok2; \ |
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| 77 | .Lfail: \ |
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| 78 | add sp, sp, #12; \ |
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| 79 | cfi_adjust_cfa_offset (-12); \ |
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| 80 | pop { r7 }; \ |
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| 81 | cfi_adjust_cfa_offset (-4); \ |
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| 82 | cfi_restore (r7); \ |
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| 83 | CALL_FAIL \ |
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| 84 | cfi_restore_state; \ |
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| 85 | .Lok2: \ |
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| 86 | mov r0, r5; \ |
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| 87 | cfi_restore_state; \ |
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| 88 | .Lok: |
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| 89 | |
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| 90 | #include <__longjmp.S> |
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| 91 | |
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