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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * PA-RISC architecture-specific signal handling support.
4 *
5 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
6 * Copyright (C) 2000 Linuxcare, Inc.
7 * Copyright (C) 2000-2022 Helge Deller <deller@gmx.de>
8 * Copyright (C) 2022 John David Anglin <dave.anglin@bell.net>
9 *
10 * Based on the ia64, i386, and alpha versions.
11 */
12
13#include <linux/sched.h>
14#include <linux/sched/debug.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/signal.h>
19#include <linux/errno.h>
20#include <linux/wait.h>
21#include <linux/ptrace.h>
22#include <linux/resume_user_mode.h>
23#include <linux/unistd.h>
24#include <linux/stddef.h>
25#include <linux/compat.h>
26#include <linux/elf.h>
27#include <asm/ucontext.h>
28#include <asm/rt_sigframe.h>
29#include <linux/uaccess.h>
30#include <asm/cacheflush.h>
31#include <asm/asm-offsets.h>
32#include <asm/vdso.h>
33
34#ifdef CONFIG_COMPAT
35#include "signal32.h"
36#endif
37
38#define DEBUG_SIG 0
39#define DEBUG_SIG_LEVEL 2
40
41#if DEBUG_SIG
42#define DBG(LEVEL, ...) \
43 ((DEBUG_SIG_LEVEL >= LEVEL) \
44 ? printk(__VA_ARGS__) : (void) 0)
45#else
46#define DBG(LEVEL, ...)
47#endif
48
49/* gcc will complain if a pointer is cast to an integer of different
50 * size. If you really need to do this (and we do for an ELF32 user
51 * application in an ELF64 kernel) then you have to do a cast to an
52 * integer of the same size first. The A() macro accomplishes
53 * this. */
54#define A(__x) ((unsigned long)(__x))
55
56/*
57 * Do a signal return - restore sigcontext.
58 */
59
60static long
61restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
62{
63 long err = 0;
64
65 err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr));
66 err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
67 err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
68 err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
69 err |= __get_user(regs->sar, &sc->sc_sar);
70 DBG(2, "%s: iaoq is %#lx / %#lx\n",
71 __func__, regs->iaoq[0], regs->iaoq[1]);
72 DBG(2, "%s: r28 is %ld\n", __func__, regs->gr[28]);
73 return err;
74}
75
76asmlinkage void
77sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
78{
79 struct rt_sigframe __user *frame;
80 sigset_t set;
81 unsigned long usp = (regs->gr[30] & ~(0x01UL));
82 unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE;
83#ifdef CONFIG_64BIT
84 struct compat_rt_sigframe __user * compat_frame;
85
86 if (is_compat_task())
87 sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
88#endif
89
90 current->restart_block.fn = do_no_restart_syscall;
91
92 /* Unwind the user stack to get the rt_sigframe structure. */
93 frame = (struct rt_sigframe __user *)
94 (usp - sigframe_size);
95 DBG(2, "%s: frame is %p pid %d\n", __func__, frame, task_pid_nr(current));
96
97 regs->orig_r28 = 1; /* no restarts for sigreturn */
98
99#ifdef CONFIG_64BIT
100 compat_frame = (struct compat_rt_sigframe __user *)frame;
101
102 if (is_compat_task()) {
103 if (get_compat_sigset(&set, &compat_frame->uc.uc_sigmask))
104 goto give_sigsegv;
105 } else
106#endif
107 {
108 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
109 goto give_sigsegv;
110 }
111
112 set_current_blocked(&set);
113
114 /* Good thing we saved the old gr[30], eh? */
115#ifdef CONFIG_64BIT
116 if (is_compat_task()) {
117 DBG(1, "%s: compat_frame->uc.uc_mcontext 0x%p\n",
118 __func__, &compat_frame->uc.uc_mcontext);
119// FIXME: Load upper half from register file
120 if (restore_sigcontext32(&compat_frame->uc.uc_mcontext,
121 &compat_frame->regs, regs))
122 goto give_sigsegv;
123 DBG(1, "%s: usp %#08lx stack 0x%p\n",
124 __func__, usp, &compat_frame->uc.uc_stack);
125 if (compat_restore_altstack(&compat_frame->uc.uc_stack))
126 goto give_sigsegv;
127 } else
128#endif
129 {
130 DBG(1, "%s: frame->uc.uc_mcontext 0x%p\n",
131 __func__, &frame->uc.uc_mcontext);
132 if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
133 goto give_sigsegv;
134 DBG(1, "%s: usp %#08lx stack 0x%p\n",
135 __func__, usp, &frame->uc.uc_stack);
136 if (restore_altstack(&frame->uc.uc_stack))
137 goto give_sigsegv;
138 }
139
140
141
142 /* If we are on the syscall path IAOQ will not be restored, and
143 * if we are on the interrupt path we must not corrupt gr31.
144 */
145 if (in_syscall)
146 regs->gr[31] = regs->iaoq[0];
147
148 return;
149
150give_sigsegv:
151 DBG(1, "%s: Sending SIGSEGV\n", __func__);
152 force_sig(SIGSEGV);
153 return;
154}
155
156/*
157 * Set up a signal frame.
158 */
159
160static inline void __user *
161get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
162{
163 /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
164 don't use the parameter it doesn't matter */
165
166 DBG(1, "%s: ka = %#lx, sp = %#lx, frame_size = %zu\n",
167 __func__, (unsigned long)ka, sp, frame_size);
168
169 /* Align alternate stack and reserve 64 bytes for the signal
170 handler's frame marker. */
171 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
172 sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */
173
174 DBG(1, "%s: Returning sp = %#lx\n", __func__, (unsigned long)sp);
175 return (void __user *) sp; /* Stacks grow up. Fun. */
176}
177
178static long
179setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, long in_syscall)
180
181{
182 unsigned long flags = 0;
183 long err = 0;
184
185 if (on_sig_stack((unsigned long) sc))
186 flags |= PARISC_SC_FLAG_ONSTACK;
187 if (in_syscall) {
188 flags |= PARISC_SC_FLAG_IN_SYSCALL;
189 /* regs->iaoq is undefined in the syscall return path */
190 err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]);
191 err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
192 err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
193 err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
194 DBG(1, "%s: iaoq %#lx / %#lx (in syscall)\n",
195 __func__, regs->gr[31], regs->gr[31]+4);
196 } else {
197 err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
198 err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
199 DBG(1, "%s: iaoq %#lx / %#lx (not in syscall)\n",
200 __func__, regs->iaoq[0], regs->iaoq[1]);
201 }
202
203 err |= __put_user(flags, &sc->sc_flags);
204 err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
205 err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
206 err |= __put_user(regs->sar, &sc->sc_sar);
207 DBG(1, "%s: r28 is %ld\n", __func__, regs->gr[28]);
208
209 return err;
210}
211
212static long
213setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs,
214 long in_syscall)
215{
216 struct rt_sigframe __user *frame;
217 unsigned long rp, usp;
218 unsigned long haddr, sigframe_size;
219 unsigned long start;
220 int err = 0;
221#ifdef CONFIG_64BIT
222 struct compat_rt_sigframe __user * compat_frame;
223#endif
224
225 usp = (regs->gr[30] & ~(0x01UL));
226 sigframe_size = PARISC_RT_SIGFRAME_SIZE;
227#ifdef CONFIG_64BIT
228 if (is_compat_task()) {
229 /* The gcc alloca implementation leaves garbage in the upper 32 bits of sp */
230 usp = (compat_uint_t)usp;
231 sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
232 }
233#endif
234 frame = get_sigframe(&ksig->ka, usp, sigframe_size);
235
236 DBG(1, "%s: frame %p info %p\n", __func__, frame, &ksig->info);
237
238 start = (unsigned long) frame;
239 if (start >= TASK_SIZE_MAX - sigframe_size)
240 return -EFAULT;
241
242#ifdef CONFIG_64BIT
243
244 compat_frame = (struct compat_rt_sigframe __user *)frame;
245
246 if (is_compat_task()) {
247 DBG(1, "%s: frame->info = 0x%p\n", __func__, &compat_frame->info);
248 err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info);
249 err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]);
250 DBG(1, "%s: frame->uc = 0x%p\n", __func__, &compat_frame->uc);
251 DBG(1, "%s: frame->uc.uc_mcontext = 0x%p\n",
252 __func__, &compat_frame->uc.uc_mcontext);
253 err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
254 &compat_frame->regs, regs, in_syscall);
255 err |= put_compat_sigset(&compat_frame->uc.uc_sigmask, set,
256 sizeof(compat_sigset_t));
257 } else
258#endif
259 {
260 DBG(1, "%s: frame->info = 0x%p\n", __func__, &frame->info);
261 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
262 err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]);
263 DBG(1, "%s: frame->uc = 0x%p\n", __func__, &frame->uc);
264 DBG(1, "%s: frame->uc.uc_mcontext = 0x%p\n",
265 __func__, &frame->uc.uc_mcontext);
266 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
267 /* FIXME: Should probably be converted as well for the compat case */
268 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
269 }
270
271 if (err)
272 return -EFAULT;
273
274#ifdef CONFIG_64BIT
275 if (!is_compat_task())
276 rp = VDSO64_SYMBOL(current, sigtramp_rt);
277 else
278#endif
279 rp = VDSO32_SYMBOL(current, sigtramp_rt);
280
281 if (in_syscall)
282 rp += 4*4; /* skip 4 instructions and start at ldi 1,%r25 */
283
284 haddr = A(ksig->ka.sa.sa_handler);
285 /* The sa_handler may be a pointer to a function descriptor */
286#ifdef CONFIG_64BIT
287 if (is_compat_task()) {
288#endif
289 if (haddr & PA_PLABEL_FDESC) {
290 Elf32_Fdesc fdesc;
291 Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
292
293 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
294
295 if (err)
296 return -EFAULT;
297
298 haddr = fdesc.addr;
299 regs->gr[19] = fdesc.gp;
300 }
301#ifdef CONFIG_64BIT
302 } else {
303 Elf64_Fdesc fdesc;
304 Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
305
306 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
307
308 if (err)
309 return -EFAULT;
310
311 haddr = fdesc.addr;
312 regs->gr[19] = fdesc.gp;
313 DBG(1, "%s: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
314 __func__, haddr, regs->gr[19], in_syscall);
315 }
316#endif
317
318 /* The syscall return path will create IAOQ values from r31.
319 */
320 if (in_syscall) {
321 regs->gr[31] = haddr;
322#ifdef CONFIG_64BIT
323 if (!test_thread_flag(TIF_32BIT))
324 sigframe_size |= 1; /* XXX ???? */
325#endif
326 } else {
327 unsigned long psw = USER_PSW;
328#ifdef CONFIG_64BIT
329 if (!test_thread_flag(TIF_32BIT))
330 psw |= PSW_W;
331#endif
332
333 /* If we are singlestepping, arrange a trap to be delivered
334 when we return to userspace. Note the semantics -- we
335 should trap before the first insn in the handler is
336 executed. Ref:
337 http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
338 */
339 if (pa_psw(current)->r) {
340 pa_psw(current)->r = 0;
341 psw |= PSW_R;
342 mtctl(-1, 0);
343 }
344
345 regs->gr[0] = psw;
346 regs->iaoq[0] = haddr | PRIV_USER;
347 regs->iaoq[1] = regs->iaoq[0] + 4;
348 }
349
350 regs->gr[2] = rp; /* userland return pointer */
351 regs->gr[26] = ksig->sig; /* signal number */
352
353#ifdef CONFIG_64BIT
354 if (is_compat_task()) {
355 regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
356 regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */
357 } else
358#endif
359 {
360 regs->gr[25] = A(&frame->info); /* siginfo pointer */
361 regs->gr[24] = A(&frame->uc); /* ucontext pointer */
362 }
363
364 DBG(1, "%s: making sigreturn frame: %#lx + %#lx = %#lx\n", __func__,
365 regs->gr[30], sigframe_size,
366 regs->gr[30] + sigframe_size);
367 /* Raise the user stack pointer to make a proper call frame. */
368 regs->gr[30] = (A(frame) + sigframe_size);
369
370
371 DBG(1, "%s: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
372 __func__, current->comm, current->pid, frame, regs->gr[30],
373 regs->iaoq[0], regs->iaoq[1], rp);
374
375 return 0;
376}
377
378/*
379 * OK, we're invoking a handler.
380 */
381
382static void
383handle_signal(struct ksignal *ksig, struct pt_regs *regs, long in_syscall)
384{
385 int ret;
386 sigset_t *oldset = sigmask_to_save();
387
388 DBG(1, "%s: sig=%d, ka=%p, info=%p, oldset=%p, regs=%p\n",
389 __func__, ksig->sig, &ksig->ka, &ksig->info, oldset, regs);
390
391 /* Set up the stack frame */
392 ret = setup_rt_frame(ksig, oldset, regs, in_syscall);
393
394 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) ||
395 test_thread_flag(TIF_BLOCKSTEP));
396
397 DBG(1, "%s: Exit (success), regs->gr[28] = %ld\n",
398 __func__, regs->gr[28]);
399}
400
401/*
402 * Check how the syscall number gets loaded into %r20 within
403 * the delay branch in userspace and adjust as needed.
404 */
405
406static void check_syscallno_in_delay_branch(struct pt_regs *regs)
407{
408 u32 opcode, source_reg;
409 u32 __user *uaddr;
410 int err;
411
412 /* Usually we don't have to restore %r20 (the system call number)
413 * because it gets loaded in the delay slot of the branch external
414 * instruction via the ldi instruction.
415 * In some cases a register-to-register copy instruction might have
416 * been used instead, in which case we need to copy the syscall
417 * number into the source register before returning to userspace.
418 */
419
420 /* A syscall is just a branch, so all we have to do is fiddle the
421 * return pointer so that the ble instruction gets executed again.
422 */
423 regs->gr[31] -= 8; /* delayed branching */
424
425 /* Get assembler opcode of code in delay branch */
426 uaddr = (u32 __user *) ((regs->gr[31] & ~3) + 4);
427 err = get_user(opcode, uaddr);
428 if (err)
429 return;
430
431 /* Check if delay branch uses "ldi int,%r20" */
432 if ((opcode & 0xffff0000) == 0x34140000)
433 return; /* everything ok, just return */
434
435 /* Check if delay branch uses "nop" */
436 if (opcode == INSN_NOP)
437 return;
438
439 /* Check if delay branch uses "copy %rX,%r20" */
440 if ((opcode & 0xffe0ffff) == 0x08000254) {
441 source_reg = (opcode >> 16) & 31;
442 regs->gr[source_reg] = regs->gr[20];
443 return;
444 }
445
446 pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n",
447 current->comm, task_pid_nr(current), opcode);
448}
449
450static inline void
451syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
452{
453 if (regs->orig_r28)
454 return;
455 regs->orig_r28 = 1; /* no more restarts */
456
457 DBG(1, "%s: orig_r28 = %ld pid %d r20 %ld\n",
458 __func__, regs->orig_r28, task_pid_nr(current), regs->gr[20]);
459
460 /* Check the return code */
461 switch (regs->gr[28]) {
462 case -ERESTART_RESTARTBLOCK:
463 case -ERESTARTNOHAND:
464 DBG(1, "%s: ERESTARTNOHAND: returning -EINTR\n", __func__);
465 regs->gr[28] = -EINTR;
466 break;
467 case -ERESTARTSYS:
468 if (!(ka->sa.sa_flags & SA_RESTART)) {
469 DBG(1, "%s: ERESTARTSYS: putting -EINTR pid %d\n",
470 __func__, task_pid_nr(current));
471 regs->gr[28] = -EINTR;
472 break;
473 }
474 fallthrough;
475 case -ERESTARTNOINTR:
476 DBG(1, "%s: %ld\n", __func__, regs->gr[28]);
477 check_syscallno_in_delay_branch(regs);
478 break;
479 }
480}
481
482static inline void
483insert_restart_trampoline(struct pt_regs *regs)
484{
485 if (regs->orig_r28)
486 return;
487 regs->orig_r28 = 1; /* no more restarts */
488
489 DBG(2, "%s: gr28 = %ld pid %d\n",
490 __func__, regs->gr[28], task_pid_nr(current));
491
492 switch (regs->gr[28]) {
493 case -ERESTART_RESTARTBLOCK: {
494 /* Restart the system call - no handlers present */
495 unsigned int *usp = (unsigned int *)regs->gr[30];
496 unsigned long rp;
497 long err = 0;
498
499 /* check that we don't exceed the stack */
500 if (A(&usp[0]) >= TASK_SIZE_MAX - 5 * sizeof(int))
501 return;
502
503 /* Call trampoline in vdso to restart the syscall
504 * with __NR_restart_syscall.
505 * Original return addresses are on stack like this:
506 *
507 * 0: <return address (orig r31)>
508 * 4: <2nd half for 64-bit>
509 */
510#ifdef CONFIG_64BIT
511 if (!is_compat_task()) {
512 err |= put_user(regs->gr[31] >> 32, &usp[0]);
513 err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
514 rp = VDSO64_SYMBOL(current, restart_syscall);
515 } else
516#endif
517 {
518 err |= put_user(regs->gr[31], &usp[0]);
519 rp = VDSO32_SYMBOL(current, restart_syscall);
520 }
521 WARN_ON(err);
522
523 regs->gr[31] = rp;
524 DBG(1, "%s: ERESTART_RESTARTBLOCK\n", __func__);
525 return;
526 }
527 case -EINTR:
528 /* ok, was handled before and should be returned. */
529 break;
530 case -ERESTARTNOHAND:
531 case -ERESTARTSYS:
532 case -ERESTARTNOINTR:
533 DBG(1, "%s: Type %ld\n", __func__, regs->gr[28]);
534 check_syscallno_in_delay_branch(regs);
535 return;
536 default:
537 break;
538 }
539}
540
541/*
542 * We need to be able to restore the syscall arguments (r21-r26) to
543 * restart syscalls. Thus, the syscall path should save them in the
544 * pt_regs structure (it's okay to do so since they are caller-save
545 * registers). As noted below, the syscall number gets restored for
546 * us due to the magic of delayed branching.
547 */
548static void do_signal(struct pt_regs *regs, long in_syscall)
549{
550 struct ksignal ksig;
551 int restart_syscall;
552 bool has_handler;
553
554 has_handler = get_signal(&ksig);
555
556 restart_syscall = 0;
557 if (in_syscall)
558 restart_syscall = 1;
559
560 if (has_handler) {
561 /* Restart a system call if necessary. */
562 if (restart_syscall)
563 syscall_restart(regs, &ksig.ka);
564
565 handle_signal(&ksig, regs, in_syscall);
566 DBG(1, "%s: Handled signal pid %d\n",
567 __func__, task_pid_nr(current));
568 return;
569 }
570
571 /* Do we need to restart the system call? */
572 if (restart_syscall)
573 insert_restart_trampoline(regs);
574
575 DBG(1, "%s: Exit (not delivered), regs->gr[28] = %ld orig_r28 = %ld pid %d\n",
576 __func__, regs->gr[28], regs->orig_r28, task_pid_nr(current));
577
578 restore_saved_sigmask();
579}
580
581asmlinkage void do_notify_resume(struct pt_regs *regs, long in_syscall)
582{
583 if (test_thread_flag(TIF_SIGPENDING) ||
584 test_thread_flag(TIF_NOTIFY_SIGNAL))
585 do_signal(regs, in_syscall);
586
587 if (test_thread_flag(TIF_NOTIFY_RESUME))
588 resume_user_mode_work(regs);
589}
1/*
2 * linux/arch/parisc/kernel/signal.c: Architecture-specific signal
3 * handling support.
4 *
5 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
6 * Copyright (C) 2000 Linuxcare, Inc.
7 *
8 * Based on the ia64, i386, and alpha versions.
9 *
10 * Like the IA-64, we are a recent enough port (we are *starting*
11 * with glibc2.2) that we do not need to support the old non-realtime
12 * Linux signals. Therefore we don't. HP/UX signals will go in
13 * arch/parisc/hpux/signal.c when we figure out how to do them.
14 */
15
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/smp.h>
19#include <linux/kernel.h>
20#include <linux/signal.h>
21#include <linux/errno.h>
22#include <linux/wait.h>
23#include <linux/ptrace.h>
24#include <linux/tracehook.h>
25#include <linux/unistd.h>
26#include <linux/stddef.h>
27#include <linux/compat.h>
28#include <linux/elf.h>
29#include <asm/ucontext.h>
30#include <asm/rt_sigframe.h>
31#include <asm/uaccess.h>
32#include <asm/pgalloc.h>
33#include <asm/cacheflush.h>
34#include <asm/asm-offsets.h>
35
36#ifdef CONFIG_COMPAT
37#include "signal32.h"
38#endif
39
40#define DEBUG_SIG 0
41#define DEBUG_SIG_LEVEL 2
42
43#if DEBUG_SIG
44#define DBG(LEVEL, ...) \
45 ((DEBUG_SIG_LEVEL >= LEVEL) \
46 ? printk(__VA_ARGS__) : (void) 0)
47#else
48#define DBG(LEVEL, ...)
49#endif
50
51
52#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
53
54/* gcc will complain if a pointer is cast to an integer of different
55 * size. If you really need to do this (and we do for an ELF32 user
56 * application in an ELF64 kernel) then you have to do a cast to an
57 * integer of the same size first. The A() macro accomplishes
58 * this. */
59#define A(__x) ((unsigned long)(__x))
60
61/*
62 * Atomically swap in the new signal mask, and wait for a signal.
63 */
64#ifdef CONFIG_64BIT
65#include "sys32.h"
66#endif
67
68/*
69 * Do a signal return - restore sigcontext.
70 */
71
72/* Trampoline for calling rt_sigreturn() */
73#define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */
74#define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */
75#define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */
76#define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */
77#define INSN_NOP 0x08000240 /* nop */
78/* For debugging */
79#define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */
80
81static long
82restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
83{
84 long err = 0;
85
86 err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr));
87 err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
88 err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
89 err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
90 err |= __get_user(regs->sar, &sc->sc_sar);
91 DBG(2,"restore_sigcontext: iaoq is 0x%#lx / 0x%#lx\n",
92 regs->iaoq[0],regs->iaoq[1]);
93 DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]);
94 return err;
95}
96
97void
98sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
99{
100 struct rt_sigframe __user *frame;
101 sigset_t set;
102 unsigned long usp = (regs->gr[30] & ~(0x01UL));
103 unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE;
104#ifdef CONFIG_64BIT
105 compat_sigset_t compat_set;
106 struct compat_rt_sigframe __user * compat_frame;
107
108 if (is_compat_task())
109 sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
110#endif
111
112
113 /* Unwind the user stack to get the rt_sigframe structure. */
114 frame = (struct rt_sigframe __user *)
115 (usp - sigframe_size);
116 DBG(2,"sys_rt_sigreturn: frame is %p\n", frame);
117
118#ifdef CONFIG_64BIT
119 compat_frame = (struct compat_rt_sigframe __user *)frame;
120
121 if (is_compat_task()) {
122 DBG(2,"sys_rt_sigreturn: ELF32 process.\n");
123 if (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set)))
124 goto give_sigsegv;
125 sigset_32to64(&set,&compat_set);
126 } else
127#endif
128 {
129 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
130 goto give_sigsegv;
131 }
132
133 sigdelsetmask(&set, ~_BLOCKABLE);
134 spin_lock_irq(¤t->sighand->siglock);
135 current->blocked = set;
136 recalc_sigpending();
137 spin_unlock_irq(¤t->sighand->siglock);
138
139 /* Good thing we saved the old gr[30], eh? */
140#ifdef CONFIG_64BIT
141 if (is_compat_task()) {
142 DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n",
143 &compat_frame->uc.uc_mcontext);
144// FIXME: Load upper half from register file
145 if (restore_sigcontext32(&compat_frame->uc.uc_mcontext,
146 &compat_frame->regs, regs))
147 goto give_sigsegv;
148 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
149 usp, &compat_frame->uc.uc_stack);
150 if (do_sigaltstack32(&compat_frame->uc.uc_stack, NULL, usp) == -EFAULT)
151 goto give_sigsegv;
152 } else
153#endif
154 {
155 DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n",
156 &frame->uc.uc_mcontext);
157 if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
158 goto give_sigsegv;
159 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
160 usp, &frame->uc.uc_stack);
161 if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
162 goto give_sigsegv;
163 }
164
165
166
167 /* If we are on the syscall path IAOQ will not be restored, and
168 * if we are on the interrupt path we must not corrupt gr31.
169 */
170 if (in_syscall)
171 regs->gr[31] = regs->iaoq[0];
172#if DEBUG_SIG
173 DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]);
174 show_regs(regs);
175#endif
176 return;
177
178give_sigsegv:
179 DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n");
180 force_sig(SIGSEGV, current);
181 return;
182}
183
184/*
185 * Set up a signal frame.
186 */
187
188static inline void __user *
189get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
190{
191 /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
192 don't use the parameter it doesn't matter */
193
194 DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
195 (unsigned long)ka, sp, frame_size);
196
197 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
198 sp = current->sas_ss_sp; /* Stacks grow up! */
199
200 DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
201 return (void __user *) sp; /* Stacks grow up. Fun. */
202}
203
204static long
205setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall)
206
207{
208 unsigned long flags = 0;
209 long err = 0;
210
211 if (on_sig_stack((unsigned long) sc))
212 flags |= PARISC_SC_FLAG_ONSTACK;
213 if (in_syscall) {
214 flags |= PARISC_SC_FLAG_IN_SYSCALL;
215 /* regs->iaoq is undefined in the syscall return path */
216 err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]);
217 err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
218 err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
219 err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
220 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n",
221 regs->gr[31], regs->gr[31]+4);
222 } else {
223 err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
224 err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
225 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n",
226 regs->iaoq[0], regs->iaoq[1]);
227 }
228
229 err |= __put_user(flags, &sc->sc_flags);
230 err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
231 err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
232 err |= __put_user(regs->sar, &sc->sc_sar);
233 DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]);
234
235 return err;
236}
237
238static long
239setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
240 sigset_t *set, struct pt_regs *regs, int in_syscall)
241{
242 struct rt_sigframe __user *frame;
243 unsigned long rp, usp;
244 unsigned long haddr, sigframe_size;
245 int err = 0;
246#ifdef CONFIG_64BIT
247 compat_int_t compat_val;
248 struct compat_rt_sigframe __user * compat_frame;
249 compat_sigset_t compat_set;
250#endif
251
252 usp = (regs->gr[30] & ~(0x01UL));
253 /*FIXME: frame_size parameter is unused, remove it. */
254 frame = get_sigframe(ka, usp, sizeof(*frame));
255
256 DBG(1,"SETUP_RT_FRAME: START\n");
257 DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info);
258
259
260#ifdef CONFIG_64BIT
261
262 compat_frame = (struct compat_rt_sigframe __user *)frame;
263
264 if (is_compat_task()) {
265 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
266 err |= copy_siginfo_to_user32(&compat_frame->info, info);
267 DBG(1,"SETUP_RT_FRAME: 1\n");
268 compat_val = (compat_int_t)current->sas_ss_sp;
269 err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp);
270 DBG(1,"SETUP_RT_FRAME: 2\n");
271 compat_val = (compat_int_t)current->sas_ss_size;
272 err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_size);
273 DBG(1,"SETUP_RT_FRAME: 3\n");
274 compat_val = sas_ss_flags(regs->gr[30]);
275 err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_flags);
276 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
277 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
278 err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
279 &compat_frame->regs, regs, in_syscall);
280 sigset_64to32(&compat_set,set);
281 err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set));
282 } else
283#endif
284 {
285 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
286 err |= copy_siginfo_to_user(&frame->info, info);
287 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
288 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
289 err |= __put_user(sas_ss_flags(regs->gr[30]),
290 &frame->uc.uc_stack.ss_flags);
291 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
292 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
293 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
294 /* FIXME: Should probably be converted as well for the compat case */
295 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
296 }
297
298 if (err)
299 goto give_sigsegv;
300
301 /* Set up to return from userspace. If provided, use a stub
302 already in userspace. The first words of tramp are used to
303 save the previous sigrestartblock trampoline that might be
304 on the stack. We start the sigreturn trampoline at
305 SIGRESTARTBLOCK_TRAMP+X. */
306 err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0,
307 &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]);
308 err |= __put_user(INSN_LDI_R20,
309 &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]);
310 err |= __put_user(INSN_BLE_SR2_R0,
311 &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]);
312 err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]);
313
314#if DEBUG_SIG
315 /* Assert that we're flushing in the correct space... */
316 {
317 int sid;
318 asm ("mfsp %%sr3,%0" : "=r" (sid));
319 DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n",
320 sid, frame->tramp);
321 }
322#endif
323
324 flush_user_dcache_range((unsigned long) &frame->tramp[0],
325 (unsigned long) &frame->tramp[TRAMP_SIZE]);
326 flush_user_icache_range((unsigned long) &frame->tramp[0],
327 (unsigned long) &frame->tramp[TRAMP_SIZE]);
328
329 /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP
330 * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP
331 * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP
332 */
333 rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP];
334
335 if (err)
336 goto give_sigsegv;
337
338 haddr = A(ka->sa.sa_handler);
339 /* The sa_handler may be a pointer to a function descriptor */
340#ifdef CONFIG_64BIT
341 if (is_compat_task()) {
342#endif
343 if (haddr & PA_PLABEL_FDESC) {
344 Elf32_Fdesc fdesc;
345 Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
346
347 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
348
349 if (err)
350 goto give_sigsegv;
351
352 haddr = fdesc.addr;
353 regs->gr[19] = fdesc.gp;
354 }
355#ifdef CONFIG_64BIT
356 } else {
357 Elf64_Fdesc fdesc;
358 Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
359
360 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
361
362 if (err)
363 goto give_sigsegv;
364
365 haddr = fdesc.addr;
366 regs->gr[19] = fdesc.gp;
367 DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
368 haddr, regs->gr[19], in_syscall);
369 }
370#endif
371
372 /* The syscall return path will create IAOQ values from r31.
373 */
374 sigframe_size = PARISC_RT_SIGFRAME_SIZE;
375#ifdef CONFIG_64BIT
376 if (is_compat_task())
377 sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
378#endif
379 if (in_syscall) {
380 regs->gr[31] = haddr;
381#ifdef CONFIG_64BIT
382 if (!test_thread_flag(TIF_32BIT))
383 sigframe_size |= 1;
384#endif
385 } else {
386 unsigned long psw = USER_PSW;
387#ifdef CONFIG_64BIT
388 if (!test_thread_flag(TIF_32BIT))
389 psw |= PSW_W;
390#endif
391
392 /* If we are singlestepping, arrange a trap to be delivered
393 when we return to userspace. Note the semantics -- we
394 should trap before the first insn in the handler is
395 executed. Ref:
396 http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
397 */
398 if (pa_psw(current)->r) {
399 pa_psw(current)->r = 0;
400 psw |= PSW_R;
401 mtctl(-1, 0);
402 }
403
404 regs->gr[0] = psw;
405 regs->iaoq[0] = haddr | 3;
406 regs->iaoq[1] = regs->iaoq[0] + 4;
407 }
408
409 regs->gr[2] = rp; /* userland return pointer */
410 regs->gr[26] = sig; /* signal number */
411
412#ifdef CONFIG_64BIT
413 if (is_compat_task()) {
414 regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
415 regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */
416 } else
417#endif
418 {
419 regs->gr[25] = A(&frame->info); /* siginfo pointer */
420 regs->gr[24] = A(&frame->uc); /* ucontext pointer */
421 }
422
423 DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n",
424 regs->gr[30], sigframe_size,
425 regs->gr[30] + sigframe_size);
426 /* Raise the user stack pointer to make a proper call frame. */
427 regs->gr[30] = (A(frame) + sigframe_size);
428
429
430 DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
431 current->comm, current->pid, frame, regs->gr[30],
432 regs->iaoq[0], regs->iaoq[1], rp);
433
434 return 1;
435
436give_sigsegv:
437 DBG(1,"setup_rt_frame: sending SIGSEGV\n");
438 force_sigsegv(sig, current);
439 return 0;
440}
441
442/*
443 * OK, we're invoking a handler.
444 */
445
446static long
447handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
448 sigset_t *oldset, struct pt_regs *regs, int in_syscall)
449{
450 DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n",
451 sig, ka, info, oldset, regs);
452
453 /* Set up the stack frame */
454 if (!setup_rt_frame(sig, ka, info, oldset, regs, in_syscall))
455 return 0;
456
457 spin_lock_irq(¤t->sighand->siglock);
458 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
459 if (!(ka->sa.sa_flags & SA_NODEFER))
460 sigaddset(¤t->blocked,sig);
461 recalc_sigpending();
462 spin_unlock_irq(¤t->sighand->siglock);
463
464 tracehook_signal_handler(sig, info, ka, regs,
465 test_thread_flag(TIF_SINGLESTEP) ||
466 test_thread_flag(TIF_BLOCKSTEP));
467
468 return 1;
469}
470
471static inline void
472syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
473{
474 /* Check the return code */
475 switch (regs->gr[28]) {
476 case -ERESTART_RESTARTBLOCK:
477 current_thread_info()->restart_block.fn =
478 do_no_restart_syscall;
479 case -ERESTARTNOHAND:
480 DBG(1,"ERESTARTNOHAND: returning -EINTR\n");
481 regs->gr[28] = -EINTR;
482 break;
483
484 case -ERESTARTSYS:
485 if (!(ka->sa.sa_flags & SA_RESTART)) {
486 DBG(1,"ERESTARTSYS: putting -EINTR\n");
487 regs->gr[28] = -EINTR;
488 break;
489 }
490 /* fallthrough */
491 case -ERESTARTNOINTR:
492 /* A syscall is just a branch, so all
493 * we have to do is fiddle the return pointer.
494 */
495 regs->gr[31] -= 8; /* delayed branching */
496 /* Preserve original r28. */
497 regs->gr[28] = regs->orig_r28;
498 break;
499 }
500}
501
502static inline void
503insert_restart_trampoline(struct pt_regs *regs)
504{
505 switch(regs->gr[28]) {
506 case -ERESTART_RESTARTBLOCK: {
507 /* Restart the system call - no handlers present */
508 unsigned int *usp = (unsigned int *)regs->gr[30];
509
510 /* Setup a trampoline to restart the syscall
511 * with __NR_restart_syscall
512 *
513 * 0: <return address (orig r31)>
514 * 4: <2nd half for 64-bit>
515 * 8: ldw 0(%sp), %r31
516 * 12: be 0x100(%sr2, %r0)
517 * 16: ldi __NR_restart_syscall, %r20
518 */
519#ifdef CONFIG_64BIT
520 put_user(regs->gr[31] >> 32, &usp[0]);
521 put_user(regs->gr[31] & 0xffffffff, &usp[1]);
522 put_user(0x0fc010df, &usp[2]);
523#else
524 put_user(regs->gr[31], &usp[0]);
525 put_user(0x0fc0109f, &usp[2]);
526#endif
527 put_user(0xe0008200, &usp[3]);
528 put_user(0x34140000, &usp[4]);
529
530 /* Stack is 64-byte aligned, and we only need
531 * to flush 1 cache line.
532 * Flushing one cacheline is cheap.
533 * "sync" on bigger (> 4 way) boxes is not.
534 */
535 flush_user_dcache_range(regs->gr[30], regs->gr[30] + 4);
536 flush_user_icache_range(regs->gr[30], regs->gr[30] + 4);
537
538 regs->gr[31] = regs->gr[30] + 8;
539 /* Preserve original r28. */
540 regs->gr[28] = regs->orig_r28;
541
542 return;
543 }
544 case -ERESTARTNOHAND:
545 case -ERESTARTSYS:
546 case -ERESTARTNOINTR: {
547 /* Hooray for delayed branching. We don't
548 * have to restore %r20 (the system call
549 * number) because it gets loaded in the delay
550 * slot of the branch external instruction.
551 */
552 regs->gr[31] -= 8;
553 /* Preserve original r28. */
554 regs->gr[28] = regs->orig_r28;
555
556 return;
557 }
558 default:
559 break;
560 }
561}
562
563/*
564 * Note that 'init' is a special process: it doesn't get signals it doesn't
565 * want to handle. Thus you cannot kill init even with a SIGKILL even by
566 * mistake.
567 *
568 * We need to be able to restore the syscall arguments (r21-r26) to
569 * restart syscalls. Thus, the syscall path should save them in the
570 * pt_regs structure (it's okay to do so since they are caller-save
571 * registers). As noted below, the syscall number gets restored for
572 * us due to the magic of delayed branching.
573 */
574asmlinkage void
575do_signal(struct pt_regs *regs, long in_syscall)
576{
577 siginfo_t info;
578 struct k_sigaction ka;
579 int signr;
580 sigset_t *oldset;
581
582 DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n",
583 oldset, regs, regs->sr[7], in_syscall);
584
585 /* Everyone else checks to see if they are in kernel mode at
586 this point and exits if that's the case. I'm not sure why
587 we would be called in that case, but for some reason we
588 are. */
589
590 if (test_thread_flag(TIF_RESTORE_SIGMASK))
591 oldset = ¤t->saved_sigmask;
592 else
593 oldset = ¤t->blocked;
594
595 DBG(1,"do_signal: oldset %08lx / %08lx\n",
596 oldset->sig[0], oldset->sig[1]);
597
598
599 /* May need to force signal if handle_signal failed to deliver */
600 while (1) {
601
602 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
603 DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
604
605 if (signr <= 0)
606 break;
607
608 /* Restart a system call if necessary. */
609 if (in_syscall)
610 syscall_restart(regs, &ka);
611
612 /* Whee! Actually deliver the signal. If the
613 delivery failed, we need to continue to iterate in
614 this loop so we can deliver the SIGSEGV... */
615 if (handle_signal(signr, &info, &ka, oldset,
616 regs, in_syscall)) {
617 DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
618 regs->gr[28]);
619 if (test_thread_flag(TIF_RESTORE_SIGMASK))
620 clear_thread_flag(TIF_RESTORE_SIGMASK);
621 return;
622 }
623 }
624 /* end of while(1) looping forever if we can't force a signal */
625
626 /* Did we come from a system call? */
627 if (in_syscall)
628 insert_restart_trampoline(regs);
629
630 DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n",
631 regs->gr[28]);
632
633 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
634 clear_thread_flag(TIF_RESTORE_SIGMASK);
635 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
636 }
637
638 return;
639}
640
641void do_notify_resume(struct pt_regs *regs, long in_syscall)
642{
643 if (test_thread_flag(TIF_SIGPENDING) ||
644 test_thread_flag(TIF_RESTORE_SIGMASK))
645 do_signal(regs, in_syscall);
646
647 if (test_thread_flag(TIF_NOTIFY_RESUME)) {
648 clear_thread_flag(TIF_NOTIFY_RESUME);
649 tracehook_notify_resume(regs);
650 if (current->replacement_session_keyring)
651 key_replace_session_keyring();
652 }
653}