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1/*
2 * linux/arch/h8300/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
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/*
12 * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
13 * and David McCullough <davidm@snapgear.com>
14 *
15 * Based on
16 * Linux/m68k by Hamish Macdonald
17 */
18
19/*
20 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
21 * Atari :-) Current limitation: Only one sigstack can be active at one time.
22 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
23 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
24 * signal handlers!
25 */
26
27#include <linux/sched.h>
28#include <linux/mm.h>
29#include <linux/kernel.h>
30#include <linux/signal.h>
31#include <linux/syscalls.h>
32#include <linux/errno.h>
33#include <linux/wait.h>
34#include <linux/ptrace.h>
35#include <linux/unistd.h>
36#include <linux/stddef.h>
37#include <linux/highuid.h>
38#include <linux/personality.h>
39#include <linux/tty.h>
40#include <linux/binfmts.h>
41#include <linux/freezer.h>
42#include <linux/tracehook.h>
43
44#include <asm/setup.h>
45#include <asm/uaccess.h>
46#include <asm/pgtable.h>
47#include <asm/traps.h>
48#include <asm/ucontext.h>
49
50/*
51 * Atomically swap in the new signal mask, and wait for a signal.
52 */
53asmlinkage int
54sys_sigsuspend(int unused1, int unused2, old_sigset_t mask)
55{
56 sigset_t blocked;
57 siginitset(&blocked, mask);
58 return sigsuspend(&blocked);
59}
60
61asmlinkage int
62sys_sigaction(int sig, const struct old_sigaction *act,
63 struct old_sigaction *oact)
64{
65 struct k_sigaction new_ka, old_ka;
66 int ret;
67
68 if (act) {
69 old_sigset_t mask;
70 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
71 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
72 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
73 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
74 __get_user(mask, &act->sa_mask))
75 return -EFAULT;
76 siginitset(&new_ka.sa.sa_mask, mask);
77 }
78
79 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
80
81 if (!ret && oact) {
82 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
83 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
84 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
85 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
86 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
87 return -EFAULT;
88 }
89
90 return ret;
91}
92
93asmlinkage int
94sys_sigaltstack(const stack_t *uss, stack_t *uoss)
95{
96 return do_sigaltstack(uss, uoss, rdusp());
97}
98
99
100/*
101 * Do a signal return; undo the signal stack.
102 *
103 * Keep the return code on the stack quadword aligned!
104 * That makes the cache flush below easier.
105 */
106
107struct sigframe
108{
109 long dummy_er0;
110 long dummy_vector;
111#if defined(CONFIG_CPU_H8S)
112 short dummy_exr;
113#endif
114 long dummy_pc;
115 char *pretcode;
116 unsigned char retcode[8];
117 unsigned long extramask[_NSIG_WORDS-1];
118 struct sigcontext sc;
119 int sig;
120} __attribute__((aligned(2),packed));
121
122struct rt_sigframe
123{
124 long dummy_er0;
125 long dummy_vector;
126#if defined(CONFIG_CPU_H8S)
127 short dummy_exr;
128#endif
129 long dummy_pc;
130 char *pretcode;
131 struct siginfo *pinfo;
132 void *puc;
133 unsigned char retcode[8];
134 struct siginfo info;
135 struct ucontext uc;
136 int sig;
137} __attribute__((aligned(2),packed));
138
139static inline int
140restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
141 int *pd0)
142{
143 int err = 0;
144 unsigned int ccr;
145 unsigned int usp;
146 unsigned int er0;
147
148 /* Always make any pending restarted system calls return -EINTR */
149 current_thread_info()->restart_block.fn = do_no_restart_syscall;
150
151#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
152 COPY(er1);
153 COPY(er2);
154 COPY(er3);
155 COPY(er5);
156 COPY(pc);
157 ccr = regs->ccr & 0x10;
158 COPY(ccr);
159#undef COPY
160 regs->ccr &= 0xef;
161 regs->ccr |= ccr;
162 regs->orig_er0 = -1; /* disable syscall checks */
163 err |= __get_user(usp, &usc->sc_usp);
164 wrusp(usp);
165
166 err |= __get_user(er0, &usc->sc_er0);
167 *pd0 = er0;
168 return err;
169}
170
171asmlinkage int do_sigreturn(unsigned long __unused,...)
172{
173 struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
174 unsigned long usp = rdusp();
175 struct sigframe *frame = (struct sigframe *)(usp - 4);
176 sigset_t set;
177 int er0;
178
179 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
180 goto badframe;
181 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
182 (_NSIG_WORDS > 1 &&
183 __copy_from_user(&set.sig[1], &frame->extramask,
184 sizeof(frame->extramask))))
185 goto badframe;
186
187 set_current_blocked(&set);
188
189 if (restore_sigcontext(regs, &frame->sc, &er0))
190 goto badframe;
191 return er0;
192
193badframe:
194 force_sig(SIGSEGV, current);
195 return 0;
196}
197
198asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
199{
200 struct pt_regs *regs = (struct pt_regs *) &__unused;
201 unsigned long usp = rdusp();
202 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
203 sigset_t set;
204 int er0;
205
206 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
207 goto badframe;
208 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
209 goto badframe;
210
211 set_current_blocked(&set);
212
213 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
214 goto badframe;
215
216 if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
217 goto badframe;
218
219 return er0;
220
221badframe:
222 force_sig(SIGSEGV, current);
223 return 0;
224}
225
226static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
227 unsigned long mask)
228{
229 int err = 0;
230
231 err |= __put_user(regs->er0, &sc->sc_er0);
232 err |= __put_user(regs->er1, &sc->sc_er1);
233 err |= __put_user(regs->er2, &sc->sc_er2);
234 err |= __put_user(regs->er3, &sc->sc_er3);
235 err |= __put_user(regs->er4, &sc->sc_er4);
236 err |= __put_user(regs->er5, &sc->sc_er5);
237 err |= __put_user(regs->er6, &sc->sc_er6);
238 err |= __put_user(rdusp(), &sc->sc_usp);
239 err |= __put_user(regs->pc, &sc->sc_pc);
240 err |= __put_user(regs->ccr, &sc->sc_ccr);
241 err |= __put_user(mask, &sc->sc_mask);
242
243 return err;
244}
245
246static inline void *
247get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
248{
249 unsigned long usp;
250
251 /* Default to using normal stack. */
252 usp = rdusp();
253
254 /* This is the X/Open sanctioned signal stack switching. */
255 if (ka->sa.sa_flags & SA_ONSTACK) {
256 if (!sas_ss_flags(usp))
257 usp = current->sas_ss_sp + current->sas_ss_size;
258 }
259 return (void *)((usp - frame_size) & -8UL);
260}
261
262static int setup_frame (int sig, struct k_sigaction *ka,
263 sigset_t *set, struct pt_regs *regs)
264{
265 struct sigframe *frame;
266 int err = 0;
267 int usig;
268 unsigned char *ret;
269
270 frame = get_sigframe(ka, regs, sizeof(*frame));
271
272 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
273 goto give_sigsegv;
274
275 usig = current_thread_info()->exec_domain
276 && current_thread_info()->exec_domain->signal_invmap
277 && sig < 32
278 ? current_thread_info()->exec_domain->signal_invmap[sig]
279 : sig;
280
281 err |= __put_user(usig, &frame->sig);
282 if (err)
283 goto give_sigsegv;
284
285 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
286 if (err)
287 goto give_sigsegv;
288
289 if (_NSIG_WORDS > 1) {
290 err |= copy_to_user(frame->extramask, &set->sig[1],
291 sizeof(frame->extramask));
292 if (err)
293 goto give_sigsegv;
294 }
295
296 ret = frame->retcode;
297 if (ka->sa.sa_flags & SA_RESTORER)
298 ret = (unsigned char *)(ka->sa.sa_restorer);
299 else {
300 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
301 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
302 (unsigned long *)(frame->retcode + 0));
303 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
304 }
305
306 /* Set up to return from userspace. */
307 err |= __put_user(ret, &frame->pretcode);
308
309 if (err)
310 goto give_sigsegv;
311
312 /* Set up registers for signal handler */
313 wrusp ((unsigned long) frame);
314 regs->pc = (unsigned long) ka->sa.sa_handler;
315 regs->er0 = (current_thread_info()->exec_domain
316 && current_thread_info()->exec_domain->signal_invmap
317 && sig < 32
318 ? current_thread_info()->exec_domain->signal_invmap[sig]
319 : sig);
320 regs->er1 = (unsigned long)&(frame->sc);
321 regs->er5 = current->mm->start_data; /* GOT base */
322
323 return 0;
324
325give_sigsegv:
326 force_sigsegv(sig, current);
327 return -EFAULT;
328}
329
330static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
331 sigset_t *set, struct pt_regs *regs)
332{
333 struct rt_sigframe *frame;
334 int err = 0;
335 int usig;
336 unsigned char *ret;
337
338 frame = get_sigframe(ka, regs, sizeof(*frame));
339
340 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
341 goto give_sigsegv;
342
343 usig = current_thread_info()->exec_domain
344 && current_thread_info()->exec_domain->signal_invmap
345 && sig < 32
346 ? current_thread_info()->exec_domain->signal_invmap[sig]
347 : sig;
348
349 err |= __put_user(usig, &frame->sig);
350 if (err)
351 goto give_sigsegv;
352
353 err |= __put_user(&frame->info, &frame->pinfo);
354 err |= __put_user(&frame->uc, &frame->puc);
355 err |= copy_siginfo_to_user(&frame->info, info);
356 if (err)
357 goto give_sigsegv;
358
359 /* Create the ucontext. */
360 err |= __put_user(0, &frame->uc.uc_flags);
361 err |= __put_user(0, &frame->uc.uc_link);
362 err |= __put_user((void *)current->sas_ss_sp,
363 &frame->uc.uc_stack.ss_sp);
364 err |= __put_user(sas_ss_flags(rdusp()),
365 &frame->uc.uc_stack.ss_flags);
366 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
367 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
368 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
369 if (err)
370 goto give_sigsegv;
371
372 /* Set up to return from userspace. */
373 ret = frame->retcode;
374 if (ka->sa.sa_flags & SA_RESTORER)
375 ret = (unsigned char *)(ka->sa.sa_restorer);
376 else {
377 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
378 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
379 (unsigned long *)(frame->retcode + 0));
380 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
381 }
382 err |= __put_user(ret, &frame->pretcode);
383
384 if (err)
385 goto give_sigsegv;
386
387 /* Set up registers for signal handler */
388 wrusp ((unsigned long) frame);
389 regs->pc = (unsigned long) ka->sa.sa_handler;
390 regs->er0 = (current_thread_info()->exec_domain
391 && current_thread_info()->exec_domain->signal_invmap
392 && sig < 32
393 ? current_thread_info()->exec_domain->signal_invmap[sig]
394 : sig);
395 regs->er1 = (unsigned long)&(frame->info);
396 regs->er2 = (unsigned long)&frame->uc;
397 regs->er5 = current->mm->start_data; /* GOT base */
398
399 return 0;
400
401give_sigsegv:
402 force_sigsegv(sig, current);
403 return -EFAULT;
404}
405
406/*
407 * OK, we're invoking a handler
408 */
409static void
410handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
411 struct pt_regs * regs)
412{
413 sigset_t *oldset = sigmask_to_save();
414 int ret;
415 /* are we from a system call? */
416 if (regs->orig_er0 >= 0) {
417 switch (regs->er0) {
418 case -ERESTART_RESTARTBLOCK:
419 case -ERESTARTNOHAND:
420 regs->er0 = -EINTR;
421 break;
422
423 case -ERESTARTSYS:
424 if (!(ka->sa.sa_flags & SA_RESTART)) {
425 regs->er0 = -EINTR;
426 break;
427 }
428 /* fallthrough */
429 case -ERESTARTNOINTR:
430 regs->er0 = regs->orig_er0;
431 regs->pc -= 2;
432 }
433 }
434
435 /* set up the stack frame */
436 if (ka->sa.sa_flags & SA_SIGINFO)
437 ret = setup_rt_frame(sig, ka, info, oldset, regs);
438 else
439 ret = setup_frame(sig, ka, oldset, regs);
440
441 if (!ret)
442 signal_delivered(sig, info, ka, regs, 0);
443}
444
445/*
446 * Note that 'init' is a special process: it doesn't get signals it doesn't
447 * want to handle. Thus you cannot kill init even with a SIGKILL even by
448 * mistake.
449 */
450static void do_signal(struct pt_regs *regs)
451{
452 siginfo_t info;
453 int signr;
454 struct k_sigaction ka;
455
456 /*
457 * We want the common case to go fast, which
458 * is why we may in certain cases get here from
459 * kernel mode. Just return without doing anything
460 * if so.
461 */
462 if ((regs->ccr & 0x10))
463 return;
464
465 current->thread.esp0 = (unsigned long) regs;
466
467 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
468 if (signr > 0) {
469 /* Whee! Actually deliver the signal. */
470 handle_signal(signr, &info, &ka, regs);
471 return;
472 }
473 /* Did we come from a system call? */
474 if (regs->orig_er0 >= 0) {
475 /* Restart the system call - no handlers present */
476 if (regs->er0 == -ERESTARTNOHAND ||
477 regs->er0 == -ERESTARTSYS ||
478 regs->er0 == -ERESTARTNOINTR) {
479 regs->er0 = regs->orig_er0;
480 regs->pc -= 2;
481 }
482 if (regs->er0 == -ERESTART_RESTARTBLOCK){
483 regs->er0 = __NR_restart_syscall;
484 regs->pc -= 2;
485 }
486 }
487
488 /* If there's no signal to deliver, we just restore the saved mask. */
489 restore_saved_sigmask();
490}
491
492asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
493{
494 if (thread_info_flags & _TIF_SIGPENDING)
495 do_signal(regs);
496
497 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
498 clear_thread_flag(TIF_NOTIFY_RESUME);
499 tracehook_notify_resume(regs);
500 }
501}
1/*
2 * linux/arch/h8300/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
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/*
12 * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
13 * and David McCullough <davidm@snapgear.com>
14 *
15 * Based on
16 * Linux/m68k by Hamish Macdonald
17 */
18
19/*
20 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
21 * Atari :-) Current limitation: Only one sigstack can be active at one time.
22 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
23 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
24 * signal handlers!
25 */
26
27#include <linux/sched.h>
28#include <linux/sched/task_stack.h>
29#include <linux/mm.h>
30#include <linux/kernel.h>
31#include <linux/signal.h>
32#include <linux/syscalls.h>
33#include <linux/errno.h>
34#include <linux/wait.h>
35#include <linux/ptrace.h>
36#include <linux/unistd.h>
37#include <linux/stddef.h>
38#include <linux/highuid.h>
39#include <linux/personality.h>
40#include <linux/tty.h>
41#include <linux/binfmts.h>
42#include <linux/tracehook.h>
43
44#include <asm/setup.h>
45#include <linux/uaccess.h>
46#include <asm/pgtable.h>
47#include <asm/traps.h>
48#include <asm/ucontext.h>
49
50/*
51 * Do a signal return; undo the signal stack.
52 *
53 * Keep the return code on the stack quadword aligned!
54 * That makes the cache flush below easier.
55 */
56
57struct rt_sigframe {
58 long dummy_er0;
59 long dummy_vector;
60#if defined(CONFIG_CPU_H8S)
61 short dummy_exr;
62#endif
63 long dummy_pc;
64 char *pretcode;
65 struct siginfo *pinfo;
66 void *puc;
67 unsigned char retcode[8];
68 struct siginfo info;
69 struct ucontext uc;
70 int sig;
71} __packed __aligned(2);
72
73static inline int
74restore_sigcontext(struct sigcontext *usc, int *pd0)
75{
76 struct pt_regs *regs = current_pt_regs();
77 int err = 0;
78 unsigned int ccr;
79 unsigned int usp;
80 unsigned int er0;
81
82 /* Always make any pending restarted system calls return -EINTR */
83 current->restart_block.fn = do_no_restart_syscall;
84
85 /* restore passed registers */
86#define COPY(r) do { err |= get_user(regs->r, &usc->sc_##r); } while (0)
87 COPY(er1);
88 COPY(er2);
89 COPY(er3);
90 COPY(er5);
91 COPY(pc);
92 ccr = regs->ccr & 0x10;
93 COPY(ccr);
94#undef COPY
95 regs->ccr &= 0xef;
96 regs->ccr |= ccr;
97 regs->orig_er0 = -1; /* disable syscall checks */
98 err |= __get_user(usp, &usc->sc_usp);
99 regs->sp = usp;
100
101 err |= __get_user(er0, &usc->sc_er0);
102 *pd0 = er0;
103 return err;
104}
105
106asmlinkage int sys_rt_sigreturn(void)
107{
108 unsigned long usp = rdusp();
109 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
110 sigset_t set;
111 int er0;
112
113 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
114 goto badframe;
115 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
116 goto badframe;
117
118 set_current_blocked(&set);
119
120 if (restore_sigcontext(&frame->uc.uc_mcontext, &er0))
121 goto badframe;
122
123 if (restore_altstack(&frame->uc.uc_stack))
124 goto badframe;
125
126 return er0;
127
128badframe:
129 force_sig(SIGSEGV, current);
130 return 0;
131}
132
133static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
134 unsigned long mask)
135{
136 int err = 0;
137
138 err |= __put_user(regs->er0, &sc->sc_er0);
139 err |= __put_user(regs->er1, &sc->sc_er1);
140 err |= __put_user(regs->er2, &sc->sc_er2);
141 err |= __put_user(regs->er3, &sc->sc_er3);
142 err |= __put_user(regs->er4, &sc->sc_er4);
143 err |= __put_user(regs->er5, &sc->sc_er5);
144 err |= __put_user(regs->er6, &sc->sc_er6);
145 err |= __put_user(rdusp(), &sc->sc_usp);
146 err |= __put_user(regs->pc, &sc->sc_pc);
147 err |= __put_user(regs->ccr, &sc->sc_ccr);
148 err |= __put_user(mask, &sc->sc_mask);
149
150 return err;
151}
152
153static inline void __user *
154get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size)
155{
156 return (void __user *)((sigsp(rdusp(), ksig) - frame_size) & -8UL);
157}
158
159static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
160 struct pt_regs *regs)
161{
162 struct rt_sigframe *frame;
163 int err = 0;
164 unsigned char *ret;
165
166 frame = get_sigframe(ksig, regs, sizeof(*frame));
167
168 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
169 return -EFAULT;
170
171 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
172 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
173
174 /* Create the ucontext. */
175 err |= __put_user(0, &frame->uc.uc_flags);
176 err |= __put_user(0, &frame->uc.uc_link);
177 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
178 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
179 err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
180 if (err)
181 return -EFAULT;
182
183 /* Set up to return from userspace. */
184 ret = (unsigned char *)&frame->retcode;
185 if (ksig->ka.sa.sa_flags & SA_RESTORER)
186 ret = (unsigned char *)(ksig->ka.sa.sa_restorer);
187 else {
188 /* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */
189 err |= __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff),
190 (unsigned long *)(frame->retcode + 0));
191 err |= __put_user(0x5700,
192 (unsigned short *)(frame->retcode + 4));
193 }
194 err |= __put_user(ret, &frame->pretcode);
195
196 if (err)
197 return -EFAULT;
198
199 /* Set up registers for signal handler */
200 regs->sp = (unsigned long)frame;
201 regs->pc = (unsigned long)ksig->ka.sa.sa_handler;
202 regs->er0 = ksig->sig;
203 regs->er1 = (unsigned long)&(frame->info);
204 regs->er2 = (unsigned long)&frame->uc;
205 regs->er5 = current->mm->start_data; /* GOT base */
206
207 return 0;
208}
209
210static void
211handle_restart(struct pt_regs *regs, struct k_sigaction *ka)
212{
213 switch (regs->er0) {
214 case -ERESTARTNOHAND:
215 if (!ka)
216 goto do_restart;
217 regs->er0 = -EINTR;
218 break;
219 case -ERESTART_RESTARTBLOCK:
220 if (!ka) {
221 regs->er0 = __NR_restart_syscall;
222 regs->pc -= 2;
223 } else
224 regs->er0 = -EINTR;
225 break;
226 case -ERESTARTSYS:
227 if (!(ka->sa.sa_flags & SA_RESTART)) {
228 regs->er0 = -EINTR;
229 break;
230 }
231 /* fallthrough */
232 case -ERESTARTNOINTR:
233do_restart:
234 regs->er0 = regs->orig_er0;
235 regs->pc -= 2;
236 break;
237 }
238}
239
240/*
241 * OK, we're invoking a handler
242 */
243static void
244handle_signal(struct ksignal *ksig, struct pt_regs *regs)
245{
246 sigset_t *oldset = sigmask_to_save();
247 int ret;
248 /* are we from a system call? */
249 if (regs->orig_er0 >= 0)
250 handle_restart(regs, &ksig->ka);
251
252 ret = setup_rt_frame(ksig, oldset, regs);
253
254 signal_setup_done(ret, ksig, 0);
255}
256
257/*
258 * Note that 'init' is a special process: it doesn't get signals it doesn't
259 * want to handle. Thus you cannot kill init even with a SIGKILL even by
260 * mistake.
261 */
262static void do_signal(struct pt_regs *regs)
263{
264 struct ksignal ksig;
265
266 current->thread.esp0 = (unsigned long) regs;
267
268 if (get_signal(&ksig)) {
269 /* Whee! Actually deliver the signal. */
270 handle_signal(&ksig, regs);
271 return;
272 }
273 /* Did we come from a system call? */
274 if (regs->orig_er0 >= 0)
275 handle_restart(regs, NULL);
276
277 /* If there's no signal to deliver, we just restore the saved mask. */
278 restore_saved_sigmask();
279}
280
281asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
282{
283 if (thread_info_flags & _TIF_SIGPENDING)
284 do_signal(regs);
285
286 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
287 clear_thread_flag(TIF_NOTIFY_RESUME);
288 tracehook_notify_resume(regs);
289 }
290}