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6d7e8eda | 1 | /* Copyright (C) 2012-2023 Free Software Foundation, Inc. |
402a76b6 MH |
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 | |
15 | License along with the GNU C Library; if not, see | |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
402a76b6 MH |
17 | |
18 | #include <sysdep.h> | |
19 | #include <rtld-global-offsets.h> | |
20 | ||
21 | #include "ucontext_i.h" | |
22 | ||
23 | .syntax unified | |
24 | .text | |
25 | ||
26 | /* int getcontext (ucontext_t *ucp) */ | |
27 | ||
28 | ENTRY(__getcontext) | |
29 | /* No need to save r0-r3, d0-d7, or d16-d31. */ | |
30 | add r1, r0, #MCONTEXT_ARM_R4 | |
31 | stmia r1, {r4-r11} | |
32 | ||
33 | /* Save R13 separately as Thumb can't STM it. */ | |
34 | str r13, [r0, #MCONTEXT_ARM_SP] | |
35 | str r14, [r0, #MCONTEXT_ARM_LR] | |
36 | /* Return to LR */ | |
37 | str r14, [r0, #MCONTEXT_ARM_PC] | |
38 | /* Return zero */ | |
39 | mov r2, #0 | |
40 | str r2, [r0, #MCONTEXT_ARM_R0] | |
41 | ||
42 | /* Save ucontext_t * across the next call. */ | |
43 | mov r4, r0 | |
6dcf80c7 | 44 | |
402a76b6 MH |
45 | /* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */ |
46 | mov r0, #SIG_BLOCK | |
47 | mov r1, #0 | |
48 | add r2, r4, #UCONTEXT_SIGMASK | |
49 | bl PLTJMP(__sigprocmask) | |
6dcf80c7 | 50 | |
1f60a18d | 51 | /* Store FP regs. Much of the FP code is copied from arm/setjmp.S. */ |
402a76b6 | 52 | |
ce1e5b11 | 53 | #ifdef SHARED |
6dcf80c7 RM |
54 | ldr r2, 1f |
55 | ldr r1, .Lrtld_global_ro | |
402a76b6 | 56 | 0: add r2, pc, r2 |
6dcf80c7 RM |
57 | ldr r2, [r2, r1] |
58 | ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET] | |
402a76b6 | 59 | #else |
6dcf80c7 RM |
60 | ldr r2, .Lhwcap |
61 | ldr r2, [r2, #0] | |
402a76b6 MH |
62 | #endif |
63 | ||
64 | add r0, r4, #UCONTEXT_REGSPACE | |
65 | ||
6dcf80c7 RM |
66 | #ifdef __SOFTFP__ |
67 | tst r2, #HWCAP_ARM_VFP | |
68 | beq .Lno_vfp | |
69 | #endif | |
70 | ||
71 | /* Store the VFP registers. | |
72 | Don't use VFP instructions directly because this code | |
73 | is used in non-VFP multilibs. */ | |
74 | /* Following instruction is vstmia r0!, {d8-d15}. */ | |
75 | stc p11, cr8, [r0], #64 | |
76 | /* Store the floating-point status register. */ | |
77 | /* Following instruction is vmrs r1, fpscr. */ | |
78 | mrc p10, 7, r1, cr1, cr0, 0 | |
79 | str r1, [r0], #4 | |
80 | .Lno_vfp: | |
81 | ||
82 | tst r2, #HWCAP_ARM_IWMMXT | |
83 | beq .Lno_iwmmxt | |
84 | ||
85 | /* Save the call-preserved iWMMXt registers. */ | |
86 | /* Following instructions are wstrd wr10, [r0], #8 (etc.) */ | |
87 | stcl p1, cr10, [r0], #8 | |
88 | stcl p1, cr11, [r0], #8 | |
89 | stcl p1, cr12, [r0], #8 | |
90 | stcl p1, cr13, [r0], #8 | |
91 | stcl p1, cr14, [r0], #8 | |
92 | stcl p1, cr15, [r0], #8 | |
93 | .Lno_iwmmxt: | |
402a76b6 MH |
94 | |
95 | /* Restore the clobbered R4 and LR. */ | |
96 | ldr r14, [r4, #MCONTEXT_ARM_LR] | |
97 | ldr r4, [r4, #MCONTEXT_ARM_R4] | |
98 | ||
99 | mov r0, #0 | |
100 | ||
101 | DO_RET(r14) | |
102 | ||
103 | END(__getcontext) | |
104 | ||
ce1e5b11 | 105 | #ifdef SHARED |
783a65c2 | 106 | 1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS |
6dcf80c7 RM |
107 | .Lrtld_global_ro: |
108 | .long C_SYMBOL_NAME(_rtld_global_ro)(GOT) | |
402a76b6 | 109 | #else |
6dcf80c7 RM |
110 | .Lhwcap: |
111 | .long C_SYMBOL_NAME(_dl_hwcap) | |
402a76b6 MH |
112 | #endif |
113 | ||
114 | ||
115 | weak_alias(__getcontext, getcontext) |