about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/alpha/getcontext.S
blob: 8a8c0108b23e7a92fad6d980c9f0d79b0033e87f (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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/* Save current context.
   Copyright (C) 2004-2019 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
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <ucontext-offsets.h>

/* ??? Should be a better place for this that's asm friendly.  */
#define SIG_BLOCK     1


ENTRY (__getcontext)
#ifdef PROF
	ldgp    gp, 0(pv)
	.set noat
	lda     AT, _mcount
	jsr     AT, (AT), _mcount
	.set at
	.prologue 1
#else
	.prologue 0
#endif

	bsr	$0, __getcontext_x
	mov	$31, $0
	ret

END(__getcontext)
weak_alias (__getcontext, getcontext)


/* An internal routine used by getcontext and setcontext.
   The incomming return address register is $0.  */

	.align	4
	.globl	__getcontext_x
	.hidden	__getcontext_x
	.usepv	__getcontext_x, no

	cfi_startproc
	cfi_return_column (64)
__getcontext_x:
	cfi_register (64, 0)

	.set noat

	/* Return value of getcontext.  $0 is the only register
	   whose value is not preserved. */
	stq	$31, UC_SIGCTX+SC_REGS($16)

	/* Store all registers into the context.  */
	stq	$1, UC_SIGCTX+SC_REGS+1*8($16)
	stq	$2, UC_SIGCTX+SC_REGS+2*8($16)
	stq	$3, UC_SIGCTX+SC_REGS+3*8($16)
	stq	$4, UC_SIGCTX+SC_REGS+4*8($16)
	stq	$5, UC_SIGCTX+SC_REGS+5*8($16)
	stq	$6, UC_SIGCTX+SC_REGS+6*8($16)
	stq	$7, UC_SIGCTX+SC_REGS+7*8($16)
	stq	$8, UC_SIGCTX+SC_REGS+8*8($16)
	stq	$9, UC_SIGCTX+SC_REGS+9*8($16)
	stq	$10, UC_SIGCTX+SC_REGS+10*8($16)
	stq	$11, UC_SIGCTX+SC_REGS+11*8($16)
	stq	$12, UC_SIGCTX+SC_REGS+12*8($16)
	stq	$13, UC_SIGCTX+SC_REGS+13*8($16)
	stq	$14, UC_SIGCTX+SC_REGS+14*8($16)
	stq	$15, UC_SIGCTX+SC_REGS+15*8($16)
	stq	$16, UC_SIGCTX+SC_REGS+16*8($16)
	stq	$17, UC_SIGCTX+SC_REGS+17*8($16)
	stq	$18, UC_SIGCTX+SC_REGS+18*8($16)
	stq	$19, UC_SIGCTX+SC_REGS+19*8($16)
	stq	$20, UC_SIGCTX+SC_REGS+20*8($16)
	stq	$21, UC_SIGCTX+SC_REGS+21*8($16)
	stq	$22, UC_SIGCTX+SC_REGS+22*8($16)
	stq	$23, UC_SIGCTX+SC_REGS+23*8($16)
	stq	$24, UC_SIGCTX+SC_REGS+24*8($16)
	stq	$25, UC_SIGCTX+SC_REGS+25*8($16)
	stq	$26, UC_SIGCTX+SC_REGS+26*8($16)
	stq	$27, UC_SIGCTX+SC_REGS+27*8($16)
	stq	$28, UC_SIGCTX+SC_REGS+28*8($16)
	stq	$29, UC_SIGCTX+SC_REGS+29*8($16)
	stq	$30, UC_SIGCTX+SC_REGS+30*8($16)
	stq	$31, UC_SIGCTX+SC_REGS+31*8($16)

	stt	$f0, UC_SIGCTX+SC_FPREGS+0*8($16)
	stt	$f1, UC_SIGCTX+SC_FPREGS+1*8($16)
	stt	$f2, UC_SIGCTX+SC_FPREGS+2*8($16)
	stt	$f3, UC_SIGCTX+SC_FPREGS+3*8($16)
	stt	$f4, UC_SIGCTX+SC_FPREGS+4*8($16)
	stt	$f5, UC_SIGCTX+SC_FPREGS+5*8($16)
	stt	$f6, UC_SIGCTX+SC_FPREGS+6*8($16)
	stt	$f7, UC_SIGCTX+SC_FPREGS+7*8($16)
	stt	$f8, UC_SIGCTX+SC_FPREGS+8*8($16)
	stt	$f9, UC_SIGCTX+SC_FPREGS+9*8($16)
	stt	$f10, UC_SIGCTX+SC_FPREGS+10*8($16)
	stt	$f11, UC_SIGCTX+SC_FPREGS+11*8($16)
	stt	$f12, UC_SIGCTX+SC_FPREGS+12*8($16)
	stt	$f13, UC_SIGCTX+SC_FPREGS+13*8($16)
	stt	$f14, UC_SIGCTX+SC_FPREGS+14*8($16)
	stt	$f15, UC_SIGCTX+SC_FPREGS+15*8($16)
	stt	$f16, UC_SIGCTX+SC_FPREGS+16*8($16)
	stt	$f17, UC_SIGCTX+SC_FPREGS+17*8($16)
	stt	$f18, UC_SIGCTX+SC_FPREGS+18*8($16)
	stt	$f19, UC_SIGCTX+SC_FPREGS+19*8($16)
	stt	$f20, UC_SIGCTX+SC_FPREGS+20*8($16)
	stt	$f21, UC_SIGCTX+SC_FPREGS+21*8($16)
	stt	$f22, UC_SIGCTX+SC_FPREGS+22*8($16)
	stt	$f23, UC_SIGCTX+SC_FPREGS+23*8($16)
	stt	$f24, UC_SIGCTX+SC_FPREGS+24*8($16)
	stt	$f25, UC_SIGCTX+SC_FPREGS+25*8($16)
	stt	$f26, UC_SIGCTX+SC_FPREGS+26*8($16)
	stt	$f27, UC_SIGCTX+SC_FPREGS+27*8($16)
	stt	$f28, UC_SIGCTX+SC_FPREGS+28*8($16)
	stt	$f29, UC_SIGCTX+SC_FPREGS+29*8($16)
	stt	$f30, UC_SIGCTX+SC_FPREGS+30*8($16)
	stt	$f31, UC_SIGCTX+SC_FPREGS+31*8($16)

	mf_fpcr $f0
	lda	$1, 8
	stt	$f0, UC_SIGCTX+SC_FPCR($16)

	/* The return address of getcontext is the restart pc.  */
	stq	$26, UC_SIGCTX+SC_PC($16)

	/* Userlevel always has a processor status word of 8.  */
	stq	$1, UC_SIGCTX+SC_PS($16)

	/* Save registers around the syscall.  We preserve $17
	   for the benefit of swapcontext.  */
	subq	$30, 4*8, $30
	cfi_adjust_cfa_offset(4*8)
	stq	$0, 0($30)
	cfi_rel_offset(64, 0)
	stq	$16, 8($30)
	stq	$17, 16($30)

	/* Save the current signal mask.  Whee, there are three
	   copies of this in the alpha ucontext_t.  */
	lda	$16, SIG_BLOCK
	lda	$17, 0
	lda	$0, __NR_osf_sigprocmask
	callsys

	ldq	$16, 8($30)
	ldq	$17, 16($30)

	stq	$0, UC_OSF_SIGMASK($16)
	stq	$0, UC_SIGCTX+SC_MASK($16)
	stq	$0, UC_SIGMASK($16)
	stq	$31, UC_SIGMASK + 1*8($16)
	stq	$31, UC_SIGMASK + 2*8($16)
	stq	$31, UC_SIGMASK + 3*8($16)
	stq	$31, UC_SIGMASK + 4*8($16)
	stq	$31, UC_SIGMASK + 5*8($16)
	stq	$31, UC_SIGMASK + 6*8($16)
	stq	$31, UC_SIGMASK + 7*8($16)
	stq	$31, UC_SIGMASK + 8*8($16)
	stq	$31, UC_SIGMASK + 9*8($16)
	stq	$31, UC_SIGMASK +10*8($16)
	stq	$31, UC_SIGMASK +11*8($16)
	stq	$31, UC_SIGMASK +12*8($16)
	stq	$31, UC_SIGMASK +13*8($16)
	stq	$31, UC_SIGMASK +14*8($16)
	stq	$31, UC_SIGMASK +15*8($16)

	ldq	$0, 0($30)
	addq	$30, 4*8, $30
	cfi_register (64, 0)
	cfi_adjust_cfa_offset(-4*8)
	ret	$31, ($0), 1

	cfi_endproc
	.size	__getcontext_x, .-__getcontext_x
	.type	__getcontext_x, @function