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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/* Modify saved context.
Copyright (C) 2009-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maciej W. Rozycki <macro@codesourcery.com>.
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 <sys/asm.h>
#include <sys/fpregdef.h>
#include <sys/regdef.h>
#include "ucontext_i.h"
/* int makecontext (ucontext_t *ucp, (void *func) (), int argc, ...) */
.text
.set nomips16
LOCALSZ = 0
ARGSZ = 0
MASK = 0x00000000
#ifdef __PIC__
LOCALSZ = 1 /* save gp */
#endif
#if _MIPS_SIM != _ABIO32
ARGSZ = 5 /* save a3-a7 */
# ifdef __PIC__
MASK = 0x10000000
# endif
#endif
FRAMESZ = (((ARGSZ + LOCALSZ) * SZREG) + ALSZ) & ALMASK
GPOFF = FRAMESZ - ((ARGSZ + 1) * SZREG)
#if _MIPS_SIM != _ABIO32
A3OFF = FRAMESZ - (5 * SZREG) /* callee-allocated */
A4OFF = FRAMESZ - (4 * SZREG)
A5OFF = FRAMESZ - (3 * SZREG)
A6OFF = FRAMESZ - (2 * SZREG)
A7OFF = FRAMESZ - (1 * SZREG)
NARGREGS = 8
#else
A3OFF = FRAMESZ + (3 * SZREG) /* caller-allocated */
NARGREGS = 4
#endif
MCONTEXT_GREGSZ = 8
#if _MIPS_SIM == _ABIO32 && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
MCONTEXT_GREGOFF = 4
#else
MCONTEXT_GREGOFF = 0
#endif
NESTED (__makecontext, FRAMESZ, ra)
.mask MASK, -(ARGSZ * SZREG)
.fmask 0x00000000, 0
98:
#ifdef __PIC__
SETUP_GP
#endif
PTR_ADDIU sp, -FRAMESZ
cfi_adjust_cfa_offset (FRAMESZ)
#ifdef __PIC__
SETUP_GP64_STACK (GPOFF, __makecontext)
SAVE_GP (GPOFF)
#endif
#ifdef PROF
.set noat
move AT, ra
jal _mcount
.set at
#endif
/* Store args to be passed. */
REG_S a3, A3OFF(sp)
#if _MIPS_SIM != _ABIO32
REG_S a4, A4OFF(sp)
REG_S a5, A5OFF(sp)
REG_S a6, A6OFF(sp)
REG_S a7, A7OFF(sp)
#endif
/* Store a magic flag. */
li v1, 1
/* zero */
REG_S v1, (MCONTEXT_GREGOFF + 0 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
/* Set up the stack. */
PTR_L t0, STACK_SP(a0)
PTR_L t2, STACK_SIZE(a0)
PTR_ADDIU t1, sp, A3OFF
PTR_ADDU t0, t2
and t0, ALMASK
blez a2, 2f /* no arguments */
/* Store register arguments. */
PTR_ADDIU t2, a0, MCONTEXT_GREGS + 4 * MCONTEXT_GREGSZ + MCONTEXT_GREGOFF
move t3, zero
0:
addiu t3, 1
REG_L v1, (t1)
PTR_ADDIU t1, SZREG
REG_S v1, (t2)
PTR_ADDIU t2, MCONTEXT_GREGSZ
bgeu t3, a2, 2f /* all done */
bltu t3, NARGREGS, 0b /* next */
/* Make room for stack arguments. */
PTR_SUBU t2, a2, t3
PTR_SLL t2, 3
PTR_SUBU t0, t2
and t0, ALMASK
/* Store stack arguments. */
move t2, t0
1:
addiu t3, 1
REG_L v1, (t1)
PTR_ADDIU t1, SZREG
REG_S v1, (t2)
PTR_ADDIU t2, SZREG
bltu t3, a2, 1b /* next */
2:
#if _MIPS_SIM == _ABIO32
/* Make room for a0-a3 storage. */
PTR_ADDIU t0, -(NARGSAVE * SZREG)
#endif
PTR_L v1, UCONTEXT_LINK(a0)
#ifdef __PIC__
PTR_ADDIU t9, 99f - 98b
#else
PTR_LA t9, 99f
#endif
/* sp */
REG_S t0, (MCONTEXT_GREGOFF + 29 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
/* s0 */
REG_S v1, (MCONTEXT_GREGOFF + 16 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
#ifdef __PIC__
/* s1 */
REG_S gp, (MCONTEXT_GREGOFF + 17 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
#endif
/* ra */
REG_S t9, (MCONTEXT_GREGOFF + 31 * MCONTEXT_GREGSZ + MCONTEXT_GREGS)(a0)
REG_S a1, (MCONTEXT_GREGOFF + MCONTEXT_PC)(a0)
#ifdef __PIC__
RESTORE_GP64_STACK
PTR_ADDIU sp, FRAMESZ
cfi_adjust_cfa_offset (-FRAMESZ)
#endif
jr ra
/* We need to terminate the FDE to stop unwinding if backtrace was
called within a context created by makecontext. */
cfi_endproc
nop
99:
#ifdef __PIC__
move gp, s1
#endif
move a0, zero
beqz s0, 0f
/* setcontext (ucp) */
move a0, s0
#ifdef __PIC__
PTR_LA t9, JUMPTARGET (__setcontext)
jalr t9
# if _MIPS_SIM == _ABIO32
move gp, s1
# endif
#else
jal JUMPTARGET (__setcontext)
#endif
move a0, v0
0:
/* exit (a0) */
#ifdef __PIC__
PTR_LA t9, HIDDEN_JUMPTARGET (exit)
jalr t9
#else
jal HIDDEN_JUMPTARGET (exit)
#endif
/* You don't exist, you won't feel anything. */
1:
lb zero, (zero)
b 1b
cfi_startproc
PSEUDO_END (__makecontext)
weak_alias (__makecontext, makecontext)
|
