about summary refs log tree commit diff
path: root/sysdeps/arm/__longjmp.S
blob: a98395797adb2cf63bea25fd1faa608d3e2ef999 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/* longjmp for ARM.
   Copyright (C) 1997-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <stap-probe.h>
#include <bits/setjmp.h>
#include <rtld-global-offsets.h>
#include <arm-features.h>

/* __longjmp(jmpbuf, val) */

ENTRY (__longjmp)
	mov	ip, r0

#ifdef CHECK_SP
	sfi_breg ip, \
	ldr	r4, [\B]	/* jmpbuf's sp */
	cfi_undefined (r4)
#ifdef PTR_DEMANGLE
	PTR_DEMANGLE (r4, r4, a3, a4)
#endif
	CHECK_SP (r4)
#endif

#ifdef PTR_DEMANGLE
	sfi_breg ip, \
	ldr	a4, [\B], #4
	PTR_DEMANGLE (a4, a4, a3, r4)
	cfi_undefined (r4)
	sfi_breg ip, \
	ldr	r4, [\B], #4
	PTR_DEMANGLE2 (r4, r4, a3)
#else
	sfi_breg ip, \
	ldr	a4, [\B], #4
	sfi_breg ip, \
	ldr	r4, [\B], #4
	cfi_undefined (r4)
#endif
	/* longjmp probe expects longjmp first argument (4@r0), second
	   argument (-4@r1), and target address (4@r4), respectively.  */
	LIBC_PROBE (longjmp, 3, 4@r0, -4@r1, 4@r4)
	sfi_sp \
	mov	sp, a4
	mov	lr, r4
	sfi_breg ip, \
	ldmia	\B!, JMP_BUF_REGLIST
	cfi_restore (v1)
	cfi_restore (v2)
	cfi_restore (v3)
	cfi_restore (v4)
	cfi_restore (v5)
	cfi_restore (v6)
	cfi_restore (sl)
	cfi_restore (fp)
	cfi_restore (sp)
	cfi_restore (lr)

#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
# define NEED_HWCAP 1
#endif

#ifdef NEED_HWCAP
# ifdef IS_IN_rtld
	LDST_PCREL (ldr, a4, a3, \
		    C_SYMBOL_NAME(_rtld_local_ro) \
		    + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
# else
#  ifdef PIC
	LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_rtld_global_ro), \
		    RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
#  else
	LDR_GLOBAL (a4, a3, C_SYMBOL_NAME(_dl_hwcap), 0)
#  endif
# endif
#endif

#ifdef __SOFTFP__
	tst	a4, #HWCAP_ARM_VFP
	beq	.Lno_vfp
#endif

	/* Restore the VFP registers.  */
	/* Following instruction is vldmia ip!, {d8-d15}.  */
	sfi_breg r12, \
	ldc	p11, cr8, [\B], #64
.Lno_vfp:

#ifndef ARM_ASSUME_NO_IWMMXT
	tst	a4, #HWCAP_ARM_IWMMXT
	beq	.Lno_iwmmxt

	/* Restore the call-preserved iWMMXt registers.  */
	/* Following instructions are wldrd wr10, [ip], #8 (etc.)  */
	sfi_breg r12, \
	ldcl	p1, cr10, [\B], #8
	sfi_breg r12, \
	ldcl	p1, cr11, [\B], #8
	sfi_breg r12, \
	ldcl	p1, cr12, [\B], #8
	sfi_breg r12, \
	ldcl	p1, cr13, [\B], #8
	sfi_breg r12, \
	ldcl	p1, cr14, [\B], #8
	sfi_breg r12, \
	ldcl	p1, cr15, [\B], #8
.Lno_iwmmxt:
#endif

	/* longjmp_target probe expects longjmp first argument (4@r0), second
	   argument (-4@r1), and target address (4@r14), respectively.  */
	LIBC_PROBE (longjmp_target, 3, 4@r0, -4@r1, 4@r14)

	movs	r0, r1		/* get the return value in place */
	it	eq
	moveq	r0, #1		/* can't let setjmp() return zero! */

	DO_RET(lr)

END (__longjmp)