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f10eff58 | 1 | /* longjmp for ARM. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
f10eff58 DJ |
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 | ||
22423683 | 15 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
f10eff58 DJ |
18 | |
19 | #include <sysdep.h> | |
80a56cc3 | 20 | #include <stap-probe.h> |
f10eff58 | 21 | #include <bits/setjmp.h> |
f10eff58 | 22 | #include <rtld-global-offsets.h> |
2aa5b9c1 | 23 | #include <arm-features.h> |
f10eff58 DJ |
24 | |
25 | /* __longjmp(jmpbuf, val) */ | |
26 | ||
27 | ENTRY (__longjmp) | |
28 | mov ip, r0 | |
f10eff58 | 29 | |
ef889ffe | 30 | #ifdef CHECK_SP |
81cb7a0b | 31 | ldr r4, [ip] /* jmpbuf's sp */ |
01b32e73 | 32 | cfi_undefined (r4) |
b7f2d27d WN |
33 | #ifdef PTR_DEMANGLE |
34 | PTR_DEMANGLE (r4, r4, a3, a4) | |
35 | #endif | |
53df8bce | 36 | CHECK_SP (r4) |
ef889ffe | 37 | #endif |
80a56cc3 | 38 | |
b7f2d27d | 39 | #ifdef PTR_DEMANGLE |
81cb7a0b | 40 | ldr a4, [ip], #4 |
80a56cc3 WN |
41 | PTR_DEMANGLE (a4, a4, a3, r4) |
42 | cfi_undefined (r4) | |
81cb7a0b | 43 | ldr r4, [ip], #4 |
80a56cc3 | 44 | PTR_DEMANGLE2 (r4, r4, a3) |
b7f2d27d | 45 | #else |
81cb7a0b ZW |
46 | ldr a4, [ip], #4 |
47 | ldr r4, [ip], #4 | |
80a56cc3 | 48 | cfi_undefined (r4) |
b7f2d27d | 49 | #endif |
80a56cc3 WN |
50 | /* longjmp probe expects longjmp first argument (4@r0), second |
51 | argument (-4@r1), and target address (4@r4), respectively. */ | |
52 | LIBC_PROBE (longjmp, 3, 4@r0, -4@r1, 4@r4) | |
53 | mov sp, a4 | |
54 | mov lr, r4 | |
81cb7a0b | 55 | ldmia ip!, JMP_BUF_REGLIST |
01b32e73 TS |
56 | cfi_restore (v1) |
57 | cfi_restore (v2) | |
58 | cfi_restore (v3) | |
59 | cfi_restore (v4) | |
60 | cfi_restore (v5) | |
61 | cfi_restore (v6) | |
62 | cfi_restore (sl) | |
63 | cfi_restore (fp) | |
64 | cfi_restore (sp) | |
65 | cfi_restore (lr) | |
f10eff58 | 66 | |
2aa5b9c1 RM |
67 | #if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__ |
68 | # define NEED_HWCAP 1 | |
69 | #endif | |
70 | ||
71 | #ifdef NEED_HWCAP | |
a3848485 | 72 | # if IS_IN (rtld) |
8c2b1ed8 RM |
73 | LDST_PCREL (ldr, a4, a3, \ |
74 | C_SYMBOL_NAME(_rtld_local_ro) \ | |
75 | + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET) | |
2aa5b9c1 | 76 | # else |
3ee57869 | 77 | # ifdef SHARED |
8c2b1ed8 RM |
78 | LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_rtld_global_ro), \ |
79 | RTLD_GLOBAL_RO_DL_HWCAP_OFFSET) | |
2aa5b9c1 | 80 | # else |
8c2b1ed8 | 81 | LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_dl_hwcap), 0) |
2aa5b9c1 RM |
82 | # endif |
83 | # endif | |
f10eff58 DJ |
84 | #endif |
85 | ||
6dcf80c7 | 86 | #ifdef __SOFTFP__ |
80a56cc3 | 87 | tst a4, #HWCAP_ARM_VFP |
6dcf80c7 RM |
88 | beq .Lno_vfp |
89 | #endif | |
f10eff58 DJ |
90 | |
91 | /* Restore the VFP registers. */ | |
fbc4c20a | 92 | /* Following instruction is vldmia ip!, {d8-d15}. */ |
81cb7a0b | 93 | ldc p11, cr8, [r12], #64 |
6dcf80c7 | 94 | .Lno_vfp: |
f10eff58 | 95 | |
2aa5b9c1 | 96 | #ifndef ARM_ASSUME_NO_IWMMXT |
80a56cc3 | 97 | tst a4, #HWCAP_ARM_IWMMXT |
6dcf80c7 | 98 | beq .Lno_iwmmxt |
4b860fb9 DJ |
99 | |
100 | /* Restore the call-preserved iWMMXt registers. */ | |
101 | /* Following instructions are wldrd wr10, [ip], #8 (etc.) */ | |
81cb7a0b ZW |
102 | ldcl p1, cr10, [r12], #8 |
103 | ldcl p1, cr11, [r12], #8 | |
104 | ldcl p1, cr12, [r12], #8 | |
105 | ldcl p1, cr13, [r12], #8 | |
106 | ldcl p1, cr14, [r12], #8 | |
107 | ldcl p1, cr15, [r12], #8 | |
6dcf80c7 | 108 | .Lno_iwmmxt: |
2aa5b9c1 | 109 | #endif |
4b860fb9 | 110 | |
80a56cc3 WN |
111 | /* longjmp_target probe expects longjmp first argument (4@r0), second |
112 | argument (-4@r1), and target address (4@r14), respectively. */ | |
113 | LIBC_PROBE (longjmp_target, 3, 4@r0, -4@r1, 4@r14) | |
114 | ||
115 | movs r0, r1 /* get the return value in place */ | |
116 | it eq | |
117 | moveq r0, #1 /* can't let setjmp() return zero! */ | |
118 | ||
f10eff58 DJ |
119 | DO_RET(lr) |
120 | ||
f10eff58 | 121 | END (__longjmp) |