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04277e02 | 1 | /* Copyright (C) 2009-2019 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
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 |
16 | <http://www.gnu.org/licenses/>. */ | |
d5efd131 | 17 | |
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18 | #include <sigaltstack-offsets.h> |
19 | ||
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20 | .section .rodata.str1.8,"aMS",@progbits,1 |
21 | .align 8 | |
22 | .LC0: | |
23 | .string "longjmp causes uninitialized stack frame" | |
24 | ||
25 | .section .sdata,"aws",@progbits | |
26 | .align 8 | |
27 | .type longjmp_msg,@object | |
28 | longjmp_msg: | |
29 | data8 .LC0 | |
30 | .size longjmp_msg, .-longjmp_msg | |
31 | ||
32 | #define __longjmp ____longjmp_chk | |
33 | ||
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34 | /* We use 32 bytes (rather than sizeof(stack_t)) so that we keep the stack |
35 | properly aligned. But we still want a sanity check to make sure 32 is | |
36 | actually enough. */ | |
37 | #define STACK_SPACE ((sizeSS + 31) & -32) | |
38 | ||
39 | /* Check the stack pointer held in the jumpbuf. Make sure it's in either the | |
40 | current stack (r12) or in the signal stack. */ | |
41 | #define CHECK_RSP \ | |
42 | ld8 loc0 = [in0]; \ | |
43 | ;; \ | |
44 | /* First see if target stack is within current one. */ \ | |
45 | cmp.ltu p0, p8 = loc0, r12; \ | |
46 | (p8) br.cond.dptk.many .Lok; \ | |
47 | \ | |
48 | /* Check if it's an alternative signal stack. */ \ | |
49 | mov out0 = r0; \ | |
50 | add out1 = -STACK_SPACE, r12; \ | |
51 | ;; \ | |
52 | mov r12 = out1; \ | |
53 | DO_CALL_VIA_BREAK (SYS_ify (sigaltstack)); \ | |
54 | ;; \ | |
55 | /* If the syscall failed, then assume it's OK. */ \ | |
56 | cmp.eq p8, p0 = -1, r10; \ | |
57 | (p8) br.cond.spnt .Lok; \ | |
58 | /* Move stack_t into regs. */ \ | |
59 | add r14 = oSS_FLAGS, r12; /* ss_flags */ \ | |
60 | add r15 = oSS_SIZE, r12; /* ss_size */ \ | |
61 | ld8 r16 = [r12]; /* ss_sp */ \ | |
62 | ;; \ | |
63 | ld4 r17 = [r14]; /* ss_flags */ \ | |
64 | ld8 r18 = [r15]; /* ss_size */ \ | |
65 | ;; \ | |
66 | sub r19 = r16, r18; /* sp - size */ \ | |
67 | /* See if we're currently on the altstack. */ \ | |
68 | tbit.nz p0, p8 = r17, 0; /* SS_ONSTACK */ \ | |
69 | (p8) br.cond.spnt .Lfail; \ | |
70 | /* Verify target is within alternative stack. */ \ | |
71 | cmp.gtu p7, p0 = loc0, r16; \ | |
72 | (p7) br.cond.spnt .Lfail; \ | |
73 | ;; \ | |
74 | cmp.ltu p0, p8 = loc0, r19; \ | |
75 | (p8) br.cond.sptk.many .Lok; \ | |
76 | ;; \ | |
77 | \ | |
78 | /* Still here? Abort! */ \ | |
79 | .Lfail: \ | |
80 | add r12 = STACK_SPACE, r12; \ | |
81 | addl loc0 = @ltoffx(longjmp_msg#), r1;; \ | |
82 | ld8.mov loc0 = [loc0], longjmp_msg#;; \ | |
83 | ld8 out0 = [loc0]; \ | |
d5efd131 | 84 | br.call.sptk.many b0 = HIDDEN_JUMPTARGET(__fortify_fail)#;; \ |
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85 | .Lok: \ |
86 | add r12 = STACK_SPACE, r12; | |
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87 | |
88 | #include "__longjmp.S" |