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