tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
microblaze_v8: Signal support
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
+703
+165
arch/microblaze/include/asm/signal.h
+165
arch/microblaze/include/asm/signal.h
···
1
+
/*
2
+
* Copyright (C) 2006 Atmark Techno, Inc.
3
+
* Yasushi SHOJI <yashi@atmark-techno.com>
4
+
* Tetsuya OHKAWA <tetsuya@atmark-techno.com>
5
+
*
6
+
* This file is subject to the terms and conditions of the GNU General Public
7
+
* License. See the file "COPYING" in the main directory of this archive
8
+
* for more details.
9
+
*/
10
+
11
+
#ifndef _ASM_MICROBLAZE_SIGNAL_H
12
+
#define _ASM_MICROBLAZE_SIGNAL_H
13
+
14
+
#define SIGHUP 1
15
+
#define SIGINT 2
16
+
#define SIGQUIT 3
17
+
#define SIGILL 4
18
+
#define SIGTRAP 5
19
+
#define SIGABRT 6
20
+
#define SIGIOT 6
21
+
#define SIGBUS 7
22
+
#define SIGFPE 8
23
+
#define SIGKILL 9
24
+
#define SIGUSR1 10
25
+
#define SIGSEGV 11
26
+
#define SIGUSR2 12
27
+
#define SIGPIPE 13
28
+
#define SIGALRM 14
29
+
#define SIGTERM 15
30
+
#define SIGSTKFLT 16
31
+
#define SIGCHLD 17
32
+
#define SIGCONT 18
33
+
#define SIGSTOP 19
34
+
#define SIGTSTP 20
35
+
#define SIGTTIN 21
36
+
#define SIGTTOU 22
37
+
#define SIGURG 23
38
+
#define SIGXCPU 24
39
+
#define SIGXFSZ 25
40
+
#define SIGVTALRM 26
41
+
#define SIGPROF 27
42
+
#define SIGWINCH 28
43
+
#define SIGIO 29
44
+
#define SIGPOLL SIGIO
45
+
/*
46
+
#define SIGLOST 29
47
+
*/
48
+
#define SIGPWR 30
49
+
#define SIGSYS 31
50
+
#define SIGUNUSED 31
51
+
52
+
/* These should not be considered constants from userland. */
53
+
#define SIGRTMIN 32
54
+
#define SIGRTMAX _NSIG
55
+
56
+
/*
57
+
* SA_FLAGS values:
58
+
*
59
+
* SA_ONSTACK indicates that a registered stack_t will be used.
60
+
* SA_RESTART flag to get restarting signals (which were the default long ago)
61
+
* SA_NOCLDSTOP flag to turn off SIGCHLD when children stop.
62
+
* SA_RESETHAND clears the handler when the signal is delivered.
63
+
* SA_NOCLDWAIT flag on SIGCHLD to inhibit zombies.
64
+
* SA_NODEFER prevents the current signal from being masked in the handler.
65
+
*
66
+
* SA_ONESHOT and SA_NOMASK are the historical Linux names for the Single
67
+
* Unix names RESETHAND and NODEFER respectively.
68
+
*/
69
+
#define SA_NOCLDSTOP 0x00000001
70
+
#define SA_NOCLDWAIT 0x00000002
71
+
#define SA_SIGINFO 0x00000004
72
+
#define SA_ONSTACK 0x08000000
73
+
#define SA_RESTART 0x10000000
74
+
#define SA_NODEFER 0x40000000
75
+
#define SA_RESETHAND 0x80000000
76
+
77
+
#define SA_NOMASK SA_NODEFER
78
+
#define SA_ONESHOT SA_RESETHAND
79
+
80
+
#define SA_RESTORER 0x04000000
81
+
82
+
/*
83
+
* sigaltstack controls
84
+
*/
85
+
#define SS_ONSTACK 1
86
+
#define SS_DISABLE 2
87
+
88
+
#define MINSIGSTKSZ 2048
89
+
#define SIGSTKSZ 8192
90
+
91
+
# ifndef __ASSEMBLY__
92
+
# include <linux/types.h>
93
+
# include <asm-generic/signal.h>
94
+
95
+
/* Avoid too many header ordering problems. */
96
+
struct siginfo;
97
+
98
+
# ifdef __KERNEL__
99
+
/*
100
+
* Most things should be clean enough to redefine this at will, if care
101
+
* is taken to make libc match.
102
+
*/
103
+
# define _NSIG 64
104
+
# define _NSIG_BPW 32
105
+
# define _NSIG_WORDS (_NSIG / _NSIG_BPW)
106
+
107
+
typedef unsigned long old_sigset_t; /* at least 32 bits */
108
+
109
+
typedef struct {
110
+
unsigned long sig[_NSIG_WORDS];
111
+
} sigset_t;
112
+
113
+
struct old_sigaction {
114
+
__sighandler_t sa_handler;
115
+
old_sigset_t sa_mask;
116
+
unsigned long sa_flags;
117
+
void (*sa_restorer)(void);
118
+
};
119
+
120
+
struct sigaction {
121
+
__sighandler_t sa_handler;
122
+
unsigned long sa_flags;
123
+
void (*sa_restorer)(void);
124
+
sigset_t sa_mask; /* mask last for extensibility */
125
+
};
126
+
127
+
struct k_sigaction {
128
+
struct sigaction sa;
129
+
};
130
+
131
+
# include <asm/sigcontext.h>
132
+
# undef __HAVE_ARCH_SIG_BITOPS
133
+
134
+
# define ptrace_signal_deliver(regs, cookie) do { } while (0)
135
+
136
+
# else /* !__KERNEL__ */
137
+
138
+
/* Here we must cater to libcs that poke about in kernel headers. */
139
+
140
+
# define NSIG 32
141
+
typedef unsigned long sigset_t;
142
+
143
+
struct sigaction {
144
+
union {
145
+
__sighandler_t _sa_handler;
146
+
void (*_sa_sigaction)(int, struct siginfo *, void *);
147
+
} _u;
148
+
sigset_t sa_mask;
149
+
unsigned long sa_flags;
150
+
void (*sa_restorer)(void);
151
+
};
152
+
153
+
# define sa_handler _u._sa_handler
154
+
# define sa_sigaction _u._sa_sigaction
155
+
156
+
# endif /* __KERNEL__ */
157
+
158
+
typedef struct sigaltstack {
159
+
void *ss_sp;
160
+
int ss_flags;
161
+
size_t ss_size;
162
+
} stack_t;
163
+
164
+
# endif /* __ASSEMBLY__ */
165
+
#endif /* _ASM_MICROBLAZE_SIGNAL_H */
+538
arch/microblaze/kernel/signal.c
+538
arch/microblaze/kernel/signal.c
···
1
+
/*
2
+
* Signal handling
3
+
*
4
+
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
5
+
* Copyright (C) 2008-2009 PetaLogix
6
+
* Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au>
7
+
* Copyright (C) 2001 NEC Corporation
8
+
* Copyright (C) 2001 Miles Bader <miles@gnu.org>
9
+
* Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima
10
+
* Copyright (C) 1991,1992 Linus Torvalds
11
+
*
12
+
* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
13
+
*
14
+
* This file was was derived from the sh version, arch/sh/kernel/signal.c
15
+
*
16
+
* This file is subject to the terms and conditions of the GNU General
17
+
* Public License. See the file COPYING in the main directory of this
18
+
* archive for more details.
19
+
*/
20
+
21
+
#include <linux/sched.h>
22
+
#include <linux/mm.h>
23
+
#include <linux/smp.h>
24
+
#include <linux/smp_lock.h>
25
+
#include <linux/kernel.h>
26
+
#include <linux/signal.h>
27
+
#include <linux/errno.h>
28
+
#include <linux/wait.h>
29
+
#include <linux/ptrace.h>
30
+
#include <linux/unistd.h>
31
+
#include <linux/stddef.h>
32
+
#include <linux/personality.h>
33
+
#include <linux/percpu.h>
34
+
#include <linux/linkage.h>
35
+
#include <asm/entry.h>
36
+
#include <asm/ucontext.h>
37
+
#include <linux/uaccess.h>
38
+
#include <asm/pgtable.h>
39
+
#include <asm/pgalloc.h>
40
+
#include <linux/signal.h>
41
+
#include <linux/syscalls.h>
42
+
#include <asm/cacheflush.h>
43
+
#include <asm/syscalls.h>
44
+
45
+
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
46
+
47
+
asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_sycall);
48
+
49
+
/*
50
+
* Atomically swap in the new signal mask, and wait for a signal.
51
+
*/
52
+
asmlinkage int
53
+
sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
54
+
{
55
+
sigset_t saveset;
56
+
57
+
mask &= _BLOCKABLE;
58
+
spin_lock_irq(¤t->sighand->siglock);
59
+
saveset = current->blocked;
60
+
siginitset(¤t->blocked, mask);
61
+
recalc_sigpending();
62
+
spin_unlock_irq(¤t->sighand->siglock);
63
+
64
+
regs->r3 = -EINTR;
65
+
while (1) {
66
+
current->state = TASK_INTERRUPTIBLE;
67
+
schedule();
68
+
if (do_signal(regs, &saveset, 1))
69
+
return -EINTR;
70
+
}
71
+
}
72
+
73
+
asmlinkage int
74
+
sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
75
+
struct pt_regs *regs)
76
+
{
77
+
sigset_t saveset, newset;
78
+
79
+
/* XXX: Don't preclude handling different sized sigset_t's. */
80
+
if (sigsetsize != sizeof(sigset_t))
81
+
return -EINVAL;
82
+
83
+
if (copy_from_user(&newset, unewset, sizeof(newset)))
84
+
return -EFAULT;
85
+
sigdelsetmask(&newset, ~_BLOCKABLE);
86
+
spin_lock_irq(¤t->sighand->siglock);
87
+
saveset = current->blocked;
88
+
current->blocked = newset;
89
+
recalc_sigpending();
90
+
spin_unlock_irq(¤t->sighand->siglock);
91
+
92
+
regs->r3 = -EINTR;
93
+
while (1) {
94
+
current->state = TASK_INTERRUPTIBLE;
95
+
schedule();
96
+
if (do_signal(regs, &saveset, 1))
97
+
return -EINTR;
98
+
}
99
+
}
100
+
101
+
asmlinkage int
102
+
sys_sigaction(int sig, const struct old_sigaction *act,
103
+
struct old_sigaction *oact)
104
+
{
105
+
struct k_sigaction new_ka, old_ka;
106
+
int ret;
107
+
108
+
if (act) {
109
+
old_sigset_t mask;
110
+
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
111
+
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
112
+
__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
113
+
return -EFAULT;
114
+
__get_user(new_ka.sa.sa_flags, &act->sa_flags);
115
+
__get_user(mask, &act->sa_mask);
116
+
siginitset(&new_ka.sa.sa_mask, mask);
117
+
}
118
+
119
+
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
120
+
121
+
if (!ret && oact) {
122
+
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
123
+
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
124
+
__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
125
+
return -EFAULT;
126
+
__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
127
+
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
128
+
}
129
+
130
+
return ret;
131
+
}
132
+
133
+
asmlinkage int
134
+
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
135
+
struct pt_regs *regs)
136
+
{
137
+
return do_sigaltstack(uss, uoss, regs->r1);
138
+
}
139
+
140
+
/*
141
+
* Do a signal return; undo the signal stack.
142
+
*/
143
+
144
+
struct sigframe {
145
+
struct sigcontext sc;
146
+
unsigned long extramask[_NSIG_WORDS-1];
147
+
unsigned long tramp[2]; /* signal trampoline */
148
+
};
149
+
150
+
struct rt_sigframe {
151
+
struct siginfo info;
152
+
struct ucontext uc;
153
+
unsigned long tramp[2]; /* signal trampoline */
154
+
};
155
+
156
+
static int
157
+
restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p)
158
+
{
159
+
unsigned int err = 0;
160
+
161
+
#define COPY(x) {err |= __get_user(regs->x, &sc->regs.x); }
162
+
COPY(r0);
163
+
COPY(r1);
164
+
COPY(r2); COPY(r3); COPY(r4); COPY(r5);
165
+
COPY(r6); COPY(r7); COPY(r8); COPY(r9);
166
+
COPY(r10); COPY(r11); COPY(r12); COPY(r13);
167
+
COPY(r14); COPY(r15); COPY(r16); COPY(r17);
168
+
COPY(r18); COPY(r19); COPY(r20); COPY(r21);
169
+
COPY(r22); COPY(r23); COPY(r24); COPY(r25);
170
+
COPY(r26); COPY(r27); COPY(r28); COPY(r29);
171
+
COPY(r30); COPY(r31);
172
+
COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
173
+
#undef COPY
174
+
175
+
*rval_p = regs->r3;
176
+
177
+
return err;
178
+
}
179
+
180
+
asmlinkage int sys_sigreturn(struct pt_regs *regs)
181
+
{
182
+
struct sigframe *frame = (struct sigframe *)regs->r1;
183
+
sigset_t set;
184
+
int rval;
185
+
186
+
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
187
+
goto badframe;
188
+
189
+
if (__get_user(set.sig[0], &frame->sc.oldmask)
190
+
|| (_NSIG_WORDS > 1
191
+
&& __copy_from_user(&set.sig[1], &frame->extramask,
192
+
sizeof(frame->extramask))))
193
+
goto badframe;
194
+
195
+
sigdelsetmask(&set, ~_BLOCKABLE);
196
+
197
+
spin_lock_irq(¤t->sighand->siglock);
198
+
current->blocked = set;
199
+
recalc_sigpending();
200
+
spin_unlock_irq(¤t->sighand->siglock);
201
+
202
+
if (restore_sigcontext(regs, &frame->sc, &rval))
203
+
goto badframe;
204
+
return rval;
205
+
206
+
badframe:
207
+
force_sig(SIGSEGV, current);
208
+
return 0;
209
+
}
210
+
211
+
asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
212
+
{
213
+
struct rt_sigframe *frame = (struct rt_sigframe *)regs->r1;
214
+
sigset_t set;
215
+
stack_t st;
216
+
int rval;
217
+
218
+
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
219
+
goto badframe;
220
+
221
+
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
222
+
goto badframe;
223
+
224
+
sigdelsetmask(&set, ~_BLOCKABLE);
225
+
spin_lock_irq(¤t->sighand->siglock);
226
+
current->blocked = set;
227
+
recalc_sigpending();
228
+
spin_unlock_irq(¤t->sighand->siglock);
229
+
230
+
if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
231
+
goto badframe;
232
+
233
+
if (__copy_from_user((void *)&st, &frame->uc.uc_stack, sizeof(st)))
234
+
goto badframe;
235
+
/* It is more difficult to avoid calling this function than to
236
+
call it and ignore errors. */
237
+
do_sigaltstack(&st, NULL, regs->r1);
238
+
239
+
return rval;
240
+
241
+
badframe:
242
+
force_sig(SIGSEGV, current);
243
+
return 0;
244
+
}
245
+
246
+
/*
247
+
* Set up a signal frame.
248
+
*/
249
+
250
+
static int
251
+
setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
252
+
unsigned long mask)
253
+
{
254
+
int err = 0;
255
+
256
+
#define COPY(x) {err |= __put_user(regs->x, &sc->regs.x); }
257
+
COPY(r0);
258
+
COPY(r1);
259
+
COPY(r2); COPY(r3); COPY(r4); COPY(r5);
260
+
COPY(r6); COPY(r7); COPY(r8); COPY(r9);
261
+
COPY(r10); COPY(r11); COPY(r12); COPY(r13);
262
+
COPY(r14); COPY(r15); COPY(r16); COPY(r17);
263
+
COPY(r18); COPY(r19); COPY(r20); COPY(r21);
264
+
COPY(r22); COPY(r23); COPY(r24); COPY(r25);
265
+
COPY(r26); COPY(r27); COPY(r28); COPY(r29);
266
+
COPY(r30); COPY(r31);
267
+
COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
268
+
#undef COPY
269
+
270
+
err |= __put_user(mask, &sc->oldmask);
271
+
272
+
return err;
273
+
}
274
+
275
+
/*
276
+
* Determine which stack to use..
277
+
*/
278
+
static inline void *
279
+
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
280
+
{
281
+
/* Default to using normal stack */
282
+
unsigned long sp = regs->r1;
283
+
284
+
if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack(sp))
285
+
sp = current->sas_ss_sp + current->sas_ss_size;
286
+
287
+
return (void *)((sp - frame_size) & -8UL);
288
+
}
289
+
290
+
static void setup_frame(int sig, struct k_sigaction *ka,
291
+
sigset_t *set, struct pt_regs *regs)
292
+
{
293
+
struct sigframe *frame;
294
+
int err = 0;
295
+
int signal;
296
+
297
+
frame = get_sigframe(ka, regs, sizeof(*frame));
298
+
299
+
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
300
+
goto give_sigsegv;
301
+
302
+
signal = current_thread_info()->exec_domain
303
+
&& current_thread_info()->exec_domain->signal_invmap
304
+
&& sig < 32
305
+
? current_thread_info()->exec_domain->signal_invmap[sig]
306
+
: sig;
307
+
308
+
err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
309
+
310
+
if (_NSIG_WORDS > 1) {
311
+
err |= __copy_to_user(frame->extramask, &set->sig[1],
312
+
sizeof(frame->extramask));
313
+
}
314
+
315
+
/* Set up to return from userspace. If provided, use a stub
316
+
already in userspace. */
317
+
/* minus 8 is offset to cater for "rtsd r15,8" offset */
318
+
if (ka->sa.sa_flags & SA_RESTORER) {
319
+
regs->r15 = ((unsigned long)ka->sa.sa_restorer)-8;
320
+
} else {
321
+
/* Note, these encodings are _big endian_! */
322
+
323
+
/* addi r12, r0, __NR_sigreturn */
324
+
err |= __put_user(0x31800000 | __NR_sigreturn ,
325
+
frame->tramp + 0);
326
+
/* brki r14, 0x8 */
327
+
err |= __put_user(0xb9cc0008, frame->tramp + 1);
328
+
329
+
/* Return from sighandler will jump to the tramp.
330
+
Negative 8 offset because return is rtsd r15, 8 */
331
+
regs->r15 = ((unsigned long)frame->tramp)-8;
332
+
333
+
__invalidate_cache_sigtramp((unsigned long)frame->tramp);
334
+
}
335
+
336
+
if (err)
337
+
goto give_sigsegv;
338
+
339
+
/* Set up registers for signal handler */
340
+
regs->r1 = (unsigned long) frame;
341
+
/* Signal handler args: */
342
+
regs->r5 = signal; /* Arg 0: signum */
343
+
regs->r6 = (unsigned long) &frame->sc; /* arg 1: sigcontext */
344
+
345
+
/* Offset of 4 to handle microblaze rtid r14, 0 */
346
+
regs->pc = (unsigned long)ka->sa.sa_handler;
347
+
348
+
set_fs(USER_DS);
349
+
350
+
#ifdef DEBUG_SIG
351
+
printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
352
+
current->comm, current->pid, frame, regs->pc);
353
+
#endif
354
+
355
+
return;
356
+
357
+
give_sigsegv:
358
+
if (sig == SIGSEGV)
359
+
ka->sa.sa_handler = SIG_DFL;
360
+
force_sig(SIGSEGV, current);
361
+
}
362
+
363
+
static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
364
+
sigset_t *set, struct pt_regs *regs)
365
+
{
366
+
struct rt_sigframe *frame;
367
+
int err = 0;
368
+
int signal;
369
+
370
+
frame = get_sigframe(ka, regs, sizeof(*frame));
371
+
372
+
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
373
+
goto give_sigsegv;
374
+
375
+
signal = current_thread_info()->exec_domain
376
+
&& current_thread_info()->exec_domain->signal_invmap
377
+
&& sig < 32
378
+
? current_thread_info()->exec_domain->signal_invmap[sig]
379
+
: sig;
380
+
381
+
err |= copy_siginfo_to_user(&frame->info, info);
382
+
383
+
/* Create the ucontext. */
384
+
err |= __put_user(0, &frame->uc.uc_flags);
385
+
err |= __put_user(0, &frame->uc.uc_link);
386
+
err |= __put_user((void *)current->sas_ss_sp,
387
+
&frame->uc.uc_stack.ss_sp);
388
+
err |= __put_user(sas_ss_flags(regs->r1),
389
+
&frame->uc.uc_stack.ss_flags);
390
+
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
391
+
err |= setup_sigcontext(&frame->uc.uc_mcontext,
392
+
regs, set->sig[0]);
393
+
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
394
+
395
+
/* Set up to return from userspace. If provided, use a stub
396
+
already in userspace. */
397
+
/* minus 8 is offset to cater for "rtsd r15,8" */
398
+
if (ka->sa.sa_flags & SA_RESTORER) {
399
+
regs->r15 = ((unsigned long)ka->sa.sa_restorer)-8;
400
+
} else {
401
+
/* addi r12, r0, __NR_sigreturn */
402
+
err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
403
+
frame->tramp + 0);
404
+
/* brki r14, 0x8 */
405
+
err |= __put_user(0xb9cc0008, frame->tramp + 1);
406
+
407
+
/* Return from sighandler will jump to the tramp.
408
+
Negative 8 offset because return is rtsd r15, 8 */
409
+
regs->r15 = ((unsigned long)frame->tramp)-8;
410
+
411
+
__invalidate_cache_sigtramp((unsigned long)frame->tramp);
412
+
}
413
+
414
+
if (err)
415
+
goto give_sigsegv;
416
+
417
+
/* Set up registers for signal handler */
418
+
regs->r1 = (unsigned long) frame;
419
+
/* Signal handler args: */
420
+
regs->r5 = signal; /* arg 0: signum */
421
+
regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
422
+
regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
423
+
/* Offset to handle microblaze rtid r14, 0 */
424
+
regs->pc = (unsigned long)ka->sa.sa_handler;
425
+
426
+
set_fs(USER_DS);
427
+
428
+
#ifdef DEBUG_SIG
429
+
printk(KERN_INFO "SIG deliver (%s:%d): sp=%p pc=%08lx\n",
430
+
current->comm, current->pid, frame, regs->pc);
431
+
#endif
432
+
433
+
return;
434
+
435
+
give_sigsegv:
436
+
if (sig == SIGSEGV)
437
+
ka->sa.sa_handler = SIG_DFL;
438
+
force_sig(SIGSEGV, current);
439
+
}
440
+
441
+
/* Handle restarting system calls */
442
+
static inline void
443
+
handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
444
+
{
445
+
switch (regs->r3) {
446
+
case -ERESTART_RESTARTBLOCK:
447
+
case -ERESTARTNOHAND:
448
+
if (!has_handler)
449
+
goto do_restart;
450
+
regs->r3 = -EINTR;
451
+
break;
452
+
case -ERESTARTSYS:
453
+
if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
454
+
regs->r3 = -EINTR;
455
+
break;
456
+
}
457
+
/* fallthrough */
458
+
case -ERESTARTNOINTR:
459
+
do_restart:
460
+
/* offset of 4 bytes to re-execute trap (brki) instruction */
461
+
regs->pc -= 4;
462
+
break;
463
+
}
464
+
}
465
+
466
+
/*
467
+
* OK, we're invoking a handler
468
+
*/
469
+
470
+
static void
471
+
handle_signal(unsigned long sig, struct k_sigaction *ka,
472
+
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
473
+
{
474
+
/* Set up the stack frame */
475
+
if (ka->sa.sa_flags & SA_SIGINFO)
476
+
setup_rt_frame(sig, ka, info, oldset, regs);
477
+
else
478
+
setup_frame(sig, ka, oldset, regs);
479
+
480
+
if (ka->sa.sa_flags & SA_ONESHOT)
481
+
ka->sa.sa_handler = SIG_DFL;
482
+
483
+
if (!(ka->sa.sa_flags & SA_NODEFER)) {
484
+
spin_lock_irq(¤t->sighand->siglock);
485
+
sigorsets(¤t->blocked,
486
+
¤t->blocked, &ka->sa.sa_mask);
487
+
sigaddset(¤t->blocked, sig);
488
+
recalc_sigpending();
489
+
spin_unlock_irq(¤t->sighand->siglock);
490
+
}
491
+
}
492
+
493
+
/*
494
+
* Note that 'init' is a special process: it doesn't get signals it doesn't
495
+
* want to handle. Thus you cannot kill init even with a SIGKILL even by
496
+
* mistake.
497
+
*
498
+
* Note that we go through the signals twice: once to check the signals that
499
+
* the kernel can handle, and then we build all the user-level signal handling
500
+
* stack-frames in one go after that.
501
+
*/
502
+
int do_signal(struct pt_regs *regs, sigset_t *oldset, int in_syscall)
503
+
{
504
+
siginfo_t info;
505
+
int signr;
506
+
struct k_sigaction ka;
507
+
#ifdef DEBUG_SIG
508
+
printk(KERN_INFO "do signal: %p %p %d\n", regs, oldset, in_syscall);
509
+
printk(KERN_INFO "do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
510
+
regs->r12, current_thread_info()->flags);
511
+
#endif
512
+
/*
513
+
* We want the common case to go fast, which
514
+
* is why we may in certain cases get here from
515
+
* kernel mode. Just return without doing anything
516
+
* if so.
517
+
*/
518
+
if (kernel_mode(regs))
519
+
return 1;
520
+
521
+
if (!oldset)
522
+
oldset = ¤t->blocked;
523
+
524
+
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
525
+
if (signr > 0) {
526
+
/* Whee! Actually deliver the signal. */
527
+
if (in_syscall)
528
+
handle_restart(regs, &ka, 1);
529
+
handle_signal(signr, &ka, &info, oldset, regs);
530
+
return 1;
531
+
}
532
+
533
+
if (in_syscall)
534
+
handle_restart(regs, NULL, 0);
535
+
536
+
/* Did we come from a system call? */
537
+
return 0;
538
+
}