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
|
/* Return from signal handler for Hurd. PowerPC version.
Copyright (C) 1996,97,98,2001 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 <hurd.h>
#include <hurd/signal.h>
#include <hurd/threadvar.h>
#include <stdlib.h>
int
__sigreturn (struct sigcontext *scp)
{
struct hurd_sigstate *ss;
mach_port_t *reply_port;
if (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK))
{
errno = EINVAL;
return -1;
}
ss = _hurd_self_sigstate ();
__spin_lock (&ss->lock);
/* Restore the set of blocked signals, and the intr_port slot. */
ss->blocked = scp->sc_mask;
ss->intr_port = scp->sc_intr_port;
/* Check for pending signals that were blocked by the old set. */
if (ss->pending & ~ss->blocked)
{
/* There are pending signals that just became unblocked. Wake up the
signal thread to deliver them. But first, squirrel away SCP where
the signal thread will notice it if it runs another handler, and
arrange to have us called over again in the new reality. */
ss->context = scp;
__spin_unlock (&ss->lock);
__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
/* If a pending signal was handled, sig_post never returned. */
__spin_lock (&ss->lock);
ss->context = NULL;
}
if (scp->sc_onstack)
{
ss->sigaltstack.ss_flags &= ~SS_ONSTACK; /* XXX threadvars */
/* XXX cannot unlock until off sigstack */
abort ();
}
else
__spin_unlock (&ss->lock);
/* Destroy the MiG reply port used by the signal handler, and restore the
reply port in use by the thread when interrupted. */
reply_port =
(mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY);
if (*reply_port)
{
mach_port_t port = *reply_port;
/* Assigning MACH_PORT_DEAD here tells libc's mig_get_reply_port not to
get another reply port, but avoids mig_dealloc_reply_port trying to
deallocate it after the receive fails (which it will, because the
reply port will be bogus, whether we do this or not). */
*reply_port = MACH_PORT_DEAD;
__mach_port_destroy (__mach_task_self (), port);
}
*reply_port = scp->sc_reply_port;
/* Restore FPU state. */
#define restore_fpr(n) \
asm volatile ("lfd " #n ",%0(31)" : : "i" (n * 4))
asm volatile ("mr 31,%0" : : "r" (scp->sc_fprs));
/* Restore the floating-point control/status register. */
asm volatile ("lfd 0,256(31)");
asm volatile ("mtfsf 0xff,0");
/* Restore floating-point registers. */
restore_fpr (0);
restore_fpr (1);
restore_fpr (2);
restore_fpr (3);
restore_fpr (4);
restore_fpr (5);
restore_fpr (6);
restore_fpr (7);
restore_fpr (8);
restore_fpr (9);
restore_fpr (10);
restore_fpr (11);
restore_fpr (12);
restore_fpr (13);
restore_fpr (14);
restore_fpr (15);
restore_fpr (16);
restore_fpr (17);
restore_fpr (18);
restore_fpr (19);
restore_fpr (20);
restore_fpr (21);
restore_fpr (22);
restore_fpr (23);
restore_fpr (24);
restore_fpr (25);
restore_fpr (26);
restore_fpr (27);
restore_fpr (28);
restore_fpr (29);
restore_fpr (30);
restore_fpr (31);
/* Load all the registers from the sigcontext. */
#define restore_gpr(n) \
asm volatile ("lwz " #n ",%0(31)" : : "i" (n * 4))
asm volatile ("addi 31,31,-188"); /* r31 = scp->gprs */
/* Restore the special purpose registers. */
asm volatile ("lwz 0,128(31); mtcr 0");
asm volatile ("lwz 0,132(31); mtxer 0");
asm volatile ("lwz 0,136(31); mtlr 0");
asm volatile ("lwz 0,-8(31); mtctr 0"); /* XXX this is the PC */
#if 0
asm volatile ("lwz 0,144(31); mtmq %0"); /* PPC601 only */
#endif
/* Restore the normal registers. */
restore_gpr (0);
restore_gpr (1);
restore_gpr (2);
restore_gpr (3);
restore_gpr (4);
restore_gpr (5);
restore_gpr (6);
restore_gpr (7);
restore_gpr (8);
restore_gpr (9);
restore_gpr (10);
restore_gpr (11);
restore_gpr (12);
restore_gpr (13);
restore_gpr (14);
restore_gpr (15);
restore_gpr (16);
restore_gpr (17);
restore_gpr (18);
restore_gpr (19);
restore_gpr (20);
restore_gpr (21);
restore_gpr (22);
restore_gpr (23);
restore_gpr (24);
restore_gpr (25);
restore_gpr (26);
restore_gpr (27);
restore_gpr (28);
restore_gpr (29);
restore_gpr (30);
restore_gpr (31);
/* Return. */
asm volatile ("bctr"); /* XXX CTR is not restored! */
/* NOTREACHED */
return -1;
}
weak_alias (__sigreturn, sigreturn)
|
