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5f72b005 | 1 | /* longjmp with sp check for C-SKY ABIV2. |
04277e02 | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
5f72b005 MH |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <sysdep.h> | |
20 | ||
21 | .section .rodata.str1.8,"aMS",@progbits,1 | |
22 | .align 2 | |
23 | .type longjmp_msg,@object | |
24 | longjmp_msg: | |
25 | .string "longjmp causes uninitialized stack frame" | |
26 | .size longjmp_msg, .-longjmp_msg | |
27 | ||
28 | .text | |
29 | #define __longjmp ____longjmp_chk | |
30 | ||
31 | #ifdef __PIC__ | |
32 | # define CALL_FAIL \ | |
33 | subi sp, 8; \ | |
34 | stw gb, (sp, 0); \ | |
35 | grs gb, .Lgetpc1; \ | |
36 | .Lgetpc1: \ | |
37 | lrw t0, .Lgetpc1@GOTPC; \ | |
38 | addu gb, gb, t0; \ | |
39 | lrw a0, longjmp_msg@GOTOFF; \ | |
40 | addu a0, a0, gb; \ | |
41 | lrw t0, (HIDDEN_JUMPTARGET (__fortify_fail))@PLT; \ | |
42 | ldr.w t0, (gb, t0 << 0); \ | |
43 | jsr t0; \ | |
44 | ldw gb, (sp, 0); \ | |
45 | addi sp, 8; | |
46 | #else /* __PIC__ */ | |
47 | # define CALL_FAIL \ | |
48 | lrw a0, longjmp_msg; \ | |
49 | jsri HIDDEN_JUMPTARGET (__fortify_fail); | |
50 | #endif /* __PIC__ */ | |
51 | ||
52 | # define CHECK_SP(reg) \ | |
53 | cmplt sp, reg; \ | |
54 | bt .Lok1; \ | |
55 | mov r9, a0; \ | |
56 | mov t0, r7; \ | |
57 | lrw r7, __NR_sigaltstack; \ | |
58 | movi a0, 0; \ | |
59 | subi sp, 12; /* sizeof (stack_t) */ \ | |
60 | mov a1, sp; \ | |
61 | trap 0; \ | |
62 | mov r7, t0; \ | |
63 | cmpnei a0, 0; \ | |
64 | bt .Lok; \ | |
65 | ldw a1, (sp, 4); \ | |
66 | btsti a1, 1; \ | |
67 | bt .Lfail; \ | |
68 | ldw a1, (sp, 0); \ | |
69 | ldw a3, (sp, 8); \ | |
70 | add a1, a3; \ | |
71 | sub a1, reg; \ | |
72 | cmphs a1, a3; \ | |
73 | bt .Lok; \ | |
74 | .Lfail: \ | |
75 | addi sp, 12; \ | |
76 | CALL_FAIL \ | |
77 | .Lok: \ | |
78 | mov a0, r9; \ | |
79 | .Lok1: | |
80 | ||
81 | #include <__longjmp.S> |