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
|
/* Copyright (C) 2012 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 "ucontext_i.h"
.syntax unified
.text
/* int getcontext (ucontext_t *ucp) */
ENTRY(__getcontext)
/* No need to save r0-r3, d0-d7, or d16-d31. */
add r1, r0, #MCONTEXT_ARM_R4
stmia r1, {r4-r11}
/* Save R13 separately as Thumb can't STM it. */
str r13, [r0, #MCONTEXT_ARM_SP]
str r14, [r0, #MCONTEXT_ARM_LR]
/* Return to LR */
str r14, [r0, #MCONTEXT_ARM_PC]
/* Return zero */
mov r2, #0
str r2, [r0, #MCONTEXT_ARM_R0]
/* Save ucontext_t * across the next call. */
mov r4, r0
/* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
mov r0, #SIG_BLOCK
mov r1, #0
add r2, r4, #UCONTEXT_SIGMASK
bl PLTJMP(sigprocmask)
#if defined __UCLIBC_HAS_FLOATS__ && ! defined __UCLIBC_HAS_SOFT_FLOAT__
# ifdef __VFP_FP__
/* Store the VFP registers. */
/* Following instruction is fstmiax ip!, {d8-d15}. */
stc p11, cr8, [r0], #64
/* Store the floating-point status register. */
/* Following instruction is fmrx r2, fpscr. */
mrc p10, 7, r1, cr1, cr0, 0
str r1, [r0], #4
# endif
#endif
#ifdef __IWMMXT__
/* Save the call-preserved iWMMXt registers. */
/* Following instructions are wstrd wr10, [r0], #8 (etc.) */
stcl p1, cr10, [r0], #8
stcl p1, cr11, [r0], #8
stcl p1, cr12, [r0], #8
stcl p1, cr13, [r0], #8
stcl p1, cr14, [r0], #8
stcl p1, cr15, [r0], #8
#endif
/* Restore the clobbered R4 and LR. */
ldr r14, [r4, #MCONTEXT_ARM_LR]
ldr r4, [r4, #MCONTEXT_ARM_R4]
mov r0, #0
DO_RET(r14)
END(__getcontext)
weak_alias(__getcontext, getcontext)
|
