1/* setjmp for ARM.
2 Copyright (C) 1997-2022 Free Software Foundation, Inc.
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 <https://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#include <stap-probe.h>
21#include <bits/setjmp.h>
22#include <rtld-global-offsets.h>
23#include <arm-features.h>
24
25ENTRY (__sigsetjmp)
26#ifdef PTR_MANGLE
27 PTR_MANGLE_LOAD (a3, ip)
28#endif
29 mov ip, r0
30
31 /* setjmp probe expects sigsetjmp first argument (4@r0), second
32 argument (-4@r1), and target address (4@r14), respectively. */
33 LIBC_PROBE (setjmp, 3, 4@r0, -4@r1, 4@r14)
34
35 /* Save sp and lr */
36#ifdef PTR_MANGLE
37 mov a4, sp
38 PTR_MANGLE2 (a4, a4, a3)
39 str a4, [ip], #4
40 PTR_MANGLE2 (a4, lr, a3)
41 str a4, [ip], #4
42#else
43 str sp, [ip], #4
44 str lr, [ip], #4
45#endif
46 /* Save registers */
47 stmia ip!, JMP_BUF_REGLIST
48
49#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
50# define NEED_HWCAP 1
51#endif
52
53#ifdef NEED_HWCAP
54 /* Check if we have a VFP unit. */
55# if IS_IN (rtld)
56 LDST_PCREL (ldr, a3, a4, \
57 C_SYMBOL_NAME(_rtld_local_ro) \
58 + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
59# else
60# ifdef SHARED
61 LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_rtld_global_ro), \
62 RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
63# else
64 LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_dl_hwcap), 0)
65# endif
66# endif
67#endif
68
69#ifdef __SOFTFP__
70 tst a3, #HWCAP_ARM_VFP
71 beq .Lno_vfp
72#endif
73
74 /* Store the VFP registers.
75 Don't use VFP instructions directly because this code
76 is used in non-VFP multilibs. */
77 /* Following instruction is vstmia ip!, {d8-d15}. */
78 stc p11, cr8, [ip], #64
79.Lno_vfp:
80
81#ifndef ARM_ASSUME_NO_IWMMXT
82 tst a3, #HWCAP_ARM_IWMMXT
83 beq .Lno_iwmmxt
84
85 /* Save the call-preserved iWMMXt registers. */
86 /* Following instructions are wstrd wr10, [ip], #8 (etc.) */
87 stcl p1, cr10, [r12], #8
88 stcl p1, cr11, [r12], #8
89 stcl p1, cr12, [r12], #8
90 stcl p1, cr13, [r12], #8
91 stcl p1, cr14, [r12], #8
92 stcl p1, cr15, [r12], #8
93.Lno_iwmmxt:
94#endif
95
96 /* Make a tail call to __sigjmp_save; it takes the same args. */
97 B PLTJMP(C_SYMBOL_NAME(__sigjmp_save))
98
99END (__sigsetjmp)
100
101hidden_def (__sigsetjmp)
102

source code of glibc/sysdeps/arm/setjmp.S