| 1 | /* Copyright (C) 2009-2024 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 | #include <rtld-global-offsets.h> |
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| 20 | |
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| 21 | .section .rodata.str1.8,"aMS" ,@progbits,1 |
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| 22 | .align 3 |
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| 23 | .LC0: |
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| 24 | .string "longjmp causes uninitialized stack frame" |
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| 25 | .section .toc,"aw" |
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| 26 | .LC1: |
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| 27 | .tc .LC0[TC],.LC0 |
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| 28 | .text |
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| 29 | |
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| 30 | #define __longjmp ____longjmp_chk |
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| 31 | |
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| 32 | #define CHECK_SP(reg) \ |
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| 33 | cmpld reg, r1; \ |
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| 34 | bge+ .Lok; \ |
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| 35 | mflr r0; \ |
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| 36 | std r0,FRAME_LR_SAVE(r1); \ |
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| 37 | mr r31,r3; \ |
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| 38 | mr r30,r4; \ |
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| 39 | stdu r1,-FRAME_MIN_SIZE-32(r1); \ |
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| 40 | cfi_remember_state; \ |
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| 41 | cfi_adjust_cfa_offset (FRAME_MIN_SIZE+32); \ |
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| 42 | cfi_offset (lr, FRAME_LR_SAVE); \ |
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| 43 | li r3,0; \ |
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| 44 | addi r4,r1,FRAME_MIN_SIZE; \ |
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| 45 | li r0,__NR_sigaltstack; \ |
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| 46 | sc; \ |
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| 47 | /* Without working sigaltstack we cannot perform the test. */ \ |
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| 48 | bso .Lok2; \ |
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| 49 | lwz r0,FRAME_MIN_SIZE+8(r1); \ |
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| 50 | andi. r4,r0,1; \ |
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| 51 | beq .Lfail; \ |
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| 52 | ld r0,FRAME_MIN_SIZE+16(r1); \ |
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| 53 | ld r4,FRAME_MIN_SIZE(r1); \ |
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| 54 | add r4,r4,r0; \ |
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| 55 | sub r3,r3,reg; \ |
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| 56 | cmpld r3,r0; \ |
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| 57 | bge+ .Lok2; \ |
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| 58 | .Lfail: \ |
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| 59 | ld r3,.LC1@toc(2); \ |
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| 60 | bl HIDDEN_JUMPTARGET (__fortify_fail); \ |
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| 61 | nop; \ |
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| 62 | .Lok2: \ |
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| 63 | mr r3,r31; \ |
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| 64 | mr r4,r30; \ |
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| 65 | cfi_restore_state; \ |
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| 66 | .Lok: |
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| 67 | |
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| 68 | #include <__longjmp-common.S> |
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| 69 | |
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