about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/hppa/getcontext.S
blob: 2d7529b3e8c3a285ba81785e5347842db19f2227 (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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/* Get current user context.
   Copyright (C) 2008-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Helge Deller <deller@gmx.de>, 2008.

   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"


	/* Trampoline function. Non-standard calling ABI.  */
	/* Can not use ENTRY(__getcontext_ret) here.  */
	.type	__getcontext_ret, @function
	.hidden	__getcontext_ret
__getcontext_ret:
	.proc
	.callinfo FRAME=0,NO_CALLS
	/* r26-r23 contain original r3-r6, but because setcontext
	   does not reload r3-r6 (it's using them as temporaries)
	   we must save them elsewhere and swap them back in.  */
	copy	%r23, %r3
	copy	%r24, %r4
	copy	%r25, %r5
	copy	%r26, %r6
	/* r20 contains original return pointer.  */
	bv	0(%r20)
	copy	%r0, %ret0
	.procend
	.size	__getcontext_ret, .-__getcontext_ret


ENTRY(__getcontext)
	/* Save the registers.  */
	stw	%r0, oR0(%r26)
	stw	%r1, oR1(%r26)
	/* stw	%r2, oR2(%r26) - used for trampoline.  */
	stw	%r3, oR3(%r26)
	stw	%r4, oR4(%r26)
	stw	%r5, oR5(%r26)
	stw	%r6, oR6(%r26)
	stw	%r7, oR7(%r26)
	stw	%r8, oR8(%r26)
	stw	%r9, oR9(%r26)
	stw	%r10, oR10(%r26)
	stw	%r11, oR11(%r26)
	stw	%r12, oR12(%r26)
	stw	%r13, oR13(%r26)
	stw	%r14, oR14(%r26)
	stw	%r15, oR15(%r26)
	stw	%r16, oR16(%r26)
	stw	%r17, oR17(%r26)
	stw	%r18, oR18(%r26)
	stw	%r19, oR19(%r26)
	/* stw	%r20, oR20(%r26) - used for trampoline.  */
	stw	%r21, oR21(%r26)
	stw	%r22, oR22(%r26)
	/* stw	%r23, oR23(%r26) - used for trampoline.  */
	/* stw	%r24, oR24(%r26) - used for trampoline.  */
	/* stw	%r25, oR25(%r26) - used for trampoline.  */
	/* stw	%r26, oR26(%r26) - used for trampoline.  */
	stw	%r27, oR27(%r26)
	stw	%r28, oR28(%r26)
	stw	%r29, oR29(%r26)
	stw	%sp, oR30(%r26)
	stw	%r31, oR31(%r26)

	stw	%r0, oUC_FLAGS(%r26)
	/* stw	%r0, oUC_LINK(%r26) - Do not overwrite.  */
	stw	%sp, oSS_SP(%r26)
	stw	%r0, oSS_FLAGS(%r26)
	stw	%r0, oSS_SIZE(%r26)

	stw	%r0, oSC_FLAGS(%r26)

	stw	%r0, oIASQ0(%r26)
	stw	%r0, oIASQ1(%r26)
	stw	%r0, oIAOQ0(%r26)
	stw	%r0, oIAOQ1(%r26)
	stw	%r0, oSAR(%r26) /* used as flag in swapcontext().  */


	/* Store floating-point regs.  */
	ldo	oFPREGS0(%r26),%r1
	fstds,ma %fr0, 8(%r1)
	fstds,ma %fr1, 8(%r1)
	fstds,ma %fr2, 8(%r1)
	fstds,ma %fr3, 8(%r1)
	fstds,ma %fr4, 8(%r1)
	fstds,ma %fr5, 8(%r1)
	fstds,ma %fr6, 8(%r1)
	fstds,ma %fr7, 8(%r1)
	fstds,ma %fr8, 8(%r1)
	fstds,ma %fr9, 8(%r1)
	fstds,ma %fr10, 8(%r1)
	fstds,ma %fr11, 8(%r1)
	fstds,ma %fr12, 8(%r1)
	fstds,ma %fr13, 8(%r1)
	fstds,ma %fr14, 8(%r1)
	fstds,ma %fr15, 8(%r1)
	fstds,ma %fr16, 8(%r1)
	fstds,ma %fr17, 8(%r1)
	fstds,ma %fr18, 8(%r1)
	fstds,ma %fr19, 8(%r1)
	fstds,ma %fr20, 8(%r1)
	fstds,ma %fr21, 8(%r1)
	fstds,ma %fr22, 8(%r1)
	fstds,ma %fr23, 8(%r1)
	fstds,ma %fr24, 8(%r1)
	fstds,ma %fr25, 8(%r1)
	fstds,ma %fr26, 8(%r1)
	fstds,ma %fr27, 8(%r1)
	fstds,ma %fr28, 8(%r1)
	fstds,ma %fr29, 8(%r1)
	fstds,ma %fr30, 8(%r1)
	fstds	 %fr31, 0(%r1)

	/* Prologue */
	stwm	%r4, 64(%sp)
#ifdef PIC
	stw	%r19, -32(%sp)
#endif

	/* Set up the trampoline registers.
	   r20, r23, r24, r25, r26 and r2 are clobbered
	   by call to getcontext() anyway. Reuse them.  */
	stw	%r2, oR20(%r26)
	stw	%r3, oR23(%r26)
	stw	%r4, oR24(%r26)
	stw	%r5, oR25(%r26)
	stw	%r6, oR26(%r26)
	ldil	L%__getcontext_ret, %r1
	ldo     R%__getcontext_ret(%r1), %r1
	stw	%r1, oR2(%r26)

	/* Save the current signal mask.  */
	/* sigprocmask(SIG_BLOCK, NULL, &ucp->uc_sigmask);  */
	ldo	oSIGMASK(%r26), %r24
	copy	%r0, %r25
	bl	sigprocmask, %r2
	ldi	SIG_BLOCK, %r26

	/* Epilogue */
	ldw	-84(%sp), %r2
#ifdef PIC
	ldw	-32(%sp), %r19
#endif
	bv	%r0(%r2)
	ldwm	-64(%sp), %r4
END(__getcontext)

weak_alias (__getcontext, getcontext)