| 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 | #include <sigaltstack-offsets.h> |
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| 21 | |
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| 22 | .section .rodata.str1.1,"aMS" ,@progbits,1 |
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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 | .text |
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| 28 | |
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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 | mov.l .Lfail, r1; \ |
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| 34 | mov.l .Lstr, r4; \ |
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| 35 | mov.l r12, @-r15; \ |
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| 36 | cfi_remember_state; \ |
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| 37 | cfi_adjust_cfa_offset (4); \ |
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| 38 | cfi_rel_offset (r12, 0); \ |
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| 39 | mova .Lgot, r0; \ |
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| 40 | mov.l .Lgot, r12; \ |
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| 41 | add r0, r12; \ |
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| 42 | sts.l pr, @-r15; \ |
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| 43 | cfi_adjust_cfa_offset (4); \ |
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| 44 | cfi_rel_offset (pr, 0); \ |
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| 45 | bsrf r1; \ |
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| 46 | add r12, r4; \ |
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| 47 | .Lfail0: \ |
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| 48 | /* Unreachable. */ \ |
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| 49 | .align 2; \ |
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| 50 | .Lgot: \ |
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| 51 | .long _GLOBAL_OFFSET_TABLE_; \ |
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| 52 | .Lstr: \ |
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| 53 | .long longjmp_msg@GOTOFF; \ |
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| 54 | .Lfail: \ |
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| 55 | .long __GI___fortify_fail@PLT-(.Lfail0-.); \ |
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| 56 | cfi_restore_state; |
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| 57 | #else |
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| 58 | # define CALL_FAIL \ |
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| 59 | mov.l .Lfail, r1; \ |
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| 60 | mov.l .Lstr, r4; \ |
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| 61 | sts.l pr, @-r15; \ |
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| 62 | cfi_remember_state; \ |
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| 63 | cfi_adjust_cfa_offset (4); \ |
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| 64 | cfi_rel_offset (pr, 0); \ |
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| 65 | jsr @r1; \ |
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| 66 | nop; \ |
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| 67 | /* Unreachable. */ \ |
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| 68 | .align 2; \ |
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| 69 | .Lstr: \ |
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| 70 | .long longjmp_msg; \ |
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| 71 | .Lfail: \ |
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| 72 | .long __fortify_fail; \ |
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| 73 | cfi_restore_state; |
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| 74 | #endif |
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| 75 | |
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| 76 | #define CHECK_SP(reg) \ |
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| 77 | /* Jumping to a higher-address frame is always allowed. */ \ |
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| 78 | cmp/hs r15, reg; \ |
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| 79 | bt .Lok; \ |
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| 80 | \ |
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| 81 | mov.l r0, @-r15; /* The return value is already in here. */ \ |
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| 82 | cfi_adjust_cfa_offset (4); \ |
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| 83 | mov.l r1, @-r15; /* PTR_DEMANGLE helper. */ \ |
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| 84 | cfi_adjust_cfa_offset (4); \ |
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| 85 | mov.l r2, @-r15; /* The new SP value is already in here. */ \ |
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| 86 | cfi_adjust_cfa_offset (4); \ |
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| 87 | mov.l r4, @-r15; /* We'll still need this one. */ \ |
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| 88 | cfi_adjust_cfa_offset (4); \ |
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| 89 | add #-sizeSS, r15; \ |
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| 90 | cfi_adjust_cfa_offset (sizeSS); \ |
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| 91 | mov #0, r4; \ |
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| 92 | mov r15, r5; \ |
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| 93 | DO_CALL (sigaltstack, 2); \ |
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| 94 | /* Without working sigaltstack we cannot perform the test. */ \ |
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| 95 | tst r0, r0; \ |
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| 96 | bf .Lok2; \ |
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| 97 | mov.l @(oSS_FLAGS, r15), r0; \ |
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| 98 | tst #SS_ONSTACK, r0; \ |
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| 99 | bt .Lcall_fail; \ |
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| 100 | mov.l @(oSS_SIZE, r15), r2; \ |
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| 101 | mov.l @(oSS_SP, r15), r1; \ |
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| 102 | add r2, r1; \ |
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| 103 | sub r8, r1; \ |
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| 104 | cmp/hi r1, r2; \ |
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| 105 | bf .Lok2; \ |
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| 106 | .Lcall_fail: \ |
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| 107 | CALL_FAIL \ |
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| 108 | \ |
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| 109 | .Lok2: \ |
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| 110 | add #sizeSS, r15; \ |
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| 111 | cfi_adjust_cfa_offset (-sizeSS); \ |
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| 112 | mov.l @r15+, r4; \ |
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| 113 | cfi_adjust_cfa_offset (-4); \ |
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| 114 | mov.l @r15+, r2; \ |
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| 115 | cfi_adjust_cfa_offset (-4); \ |
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| 116 | mov.l @r15+, r1; \ |
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| 117 | cfi_adjust_cfa_offset (-4); \ |
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| 118 | mov.l @r15+, r0; \ |
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| 119 | cfi_adjust_cfa_offset (-4); \ |
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| 120 | .Lok: |
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| 121 | |
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| 122 | #include <__longjmp.S> |
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| 123 | |
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