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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.
13 */
14
15#include <linux/sched.h>
16#include <linux/mm.h>
17#include <linux/smp.h>
18#include <linux/kernel.h>
19#include <linux/signal.h>
20#include <linux/errno.h>
21#include <linux/wait.h>
22#include <linux/ptrace.h>
23#include <linux/tracehook.h>
24#include <linux/unistd.h>
25#include <linux/stddef.h>
26#include <linux/compat.h>
27#include <linux/elf.h>
28#include <asm/ucontext.h>
29#include <asm/rt_sigframe.h>
30#include <asm/uaccess.h>
31#include <asm/pgalloc.h>
32#include <asm/cacheflush.h>
33#include <asm/asm-offsets.h>
34
35#ifdef CONFIG_COMPAT
36#include "signal32.h"
37#endif
38
39#define DEBUG_SIG 0
40#define DEBUG_SIG_LEVEL 2
41
42#if DEBUG_SIG
43#define DBG(LEVEL, ...) \
44 ((DEBUG_SIG_LEVEL >= LEVEL) \
45 ? printk(__VA_ARGS__) : (void) 0)
46#else
47#define DBG(LEVEL, ...)
48#endif
49
50/* gcc will complain if a pointer is cast to an integer of different
51 * size. If you really need to do this (and we do for an ELF32 user
52 * application in an ELF64 kernel) then you have to do a cast to an
53 * integer of the same size first. The A() macro accomplishes
54 * this. */
55#define A(__x) ((unsigned long)(__x))
56
57/*
58 * Do a signal return - restore sigcontext.
59 */
60
61/* Trampoline for calling rt_sigreturn() */
62#define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */
63#define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */
64#define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */
65#define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */
66#define INSN_NOP 0x08000240 /* nop */
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 compat_sigset_t compat_set;
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 (__copy_from_user(&compat_set, &compat_frame->uc.uc_sigmask, sizeof(compat_set)))
116 goto give_sigsegv;
117 sigset_32to64(&set,&compat_set);
118 } else
119#endif
120 {
121 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
122 goto give_sigsegv;
123 }
124
125 set_current_blocked(&set);
126
127 /* Good thing we saved the old gr[30], eh? */
128#ifdef CONFIG_64BIT
129 if (is_compat_task()) {
130 DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n",
131 &compat_frame->uc.uc_mcontext);
132// FIXME: Load upper half from register file
133 if (restore_sigcontext32(&compat_frame->uc.uc_mcontext,
134 &compat_frame->regs, regs))
135 goto give_sigsegv;
136 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
137 usp, &compat_frame->uc.uc_stack);
138 if (compat_restore_altstack(&compat_frame->uc.uc_stack))
139 goto give_sigsegv;
140 } else
141#endif
142 {
143 DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n",
144 &frame->uc.uc_mcontext);
145 if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
146 goto give_sigsegv;
147 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n",
148 usp, &frame->uc.uc_stack);
149 if (restore_altstack(&frame->uc.uc_stack))
150 goto give_sigsegv;
151 }
152
153
154
155 /* If we are on the syscall path IAOQ will not be restored, and
156 * if we are on the interrupt path we must not corrupt gr31.
157 */
158 if (in_syscall)
159 regs->gr[31] = regs->iaoq[0];
160#if DEBUG_SIG
161 DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]);
162 show_regs(regs);
163#endif
164 return;
165
166give_sigsegv:
167 DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n");
168 force_sig(SIGSEGV, current);
169 return;
170}
171
172/*
173 * Set up a signal frame.
174 */
175
176static inline void __user *
177get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
178{
179 /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
180 don't use the parameter it doesn't matter */
181
182 DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
183 (unsigned long)ka, sp, frame_size);
184
185 /* Align alternate stack and reserve 64 bytes for the signal
186 handler's frame marker. */
187 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
188 sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */
189
190 DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
191 return (void __user *) sp; /* Stacks grow up. Fun. */
192}
193
194static long
195setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall)
196
197{
198 unsigned long flags = 0;
199 long err = 0;
200
201 if (on_sig_stack((unsigned long) sc))
202 flags |= PARISC_SC_FLAG_ONSTACK;
203 if (in_syscall) {
204 flags |= PARISC_SC_FLAG_IN_SYSCALL;
205 /* regs->iaoq is undefined in the syscall return path */
206 err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]);
207 err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
208 err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
209 err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
210 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n",
211 regs->gr[31], regs->gr[31]+4);
212 } else {
213 err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
214 err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
215 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n",
216 regs->iaoq[0], regs->iaoq[1]);
217 }
218
219 err |= __put_user(flags, &sc->sc_flags);
220 err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
221 err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
222 err |= __put_user(regs->sar, &sc->sc_sar);
223 DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]);
224
225 return err;
226}
227
228static long
229setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs,
230 int in_syscall)
231{
232 struct rt_sigframe __user *frame;
233 unsigned long rp, usp;
234 unsigned long haddr, sigframe_size;
235 int err = 0;
236#ifdef CONFIG_64BIT
237 struct compat_rt_sigframe __user * compat_frame;
238 compat_sigset_t compat_set;
239#endif
240
241 usp = (regs->gr[30] & ~(0x01UL));
242 /*FIXME: frame_size parameter is unused, remove it. */
243 frame = get_sigframe(&ksig->ka, usp, sizeof(*frame));
244
245 DBG(1,"SETUP_RT_FRAME: START\n");
246 DBG(1,"setup_rt_frame: frame %p info %p\n", frame, ksig->info);
247
248
249#ifdef CONFIG_64BIT
250
251 compat_frame = (struct compat_rt_sigframe __user *)frame;
252
253 if (is_compat_task()) {
254 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
255 err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info);
256 err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]);
257 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
258 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
259 err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
260 &compat_frame->regs, regs, in_syscall);
261 sigset_64to32(&compat_set,set);
262 err |= __copy_to_user(&compat_frame->uc.uc_sigmask, &compat_set, sizeof(compat_set));
263 } else
264#endif
265 {
266 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
267 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
268 err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]);
269 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
270 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
271 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
272 /* FIXME: Should probably be converted as well for the compat case */
273 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
274 }
275
276 if (err)
277 return -EFAULT;
278
279 /* Set up to return from userspace. If provided, use a stub
280 already in userspace. The first words of tramp are used to
281 save the previous sigrestartblock trampoline that might be
282 on the stack. We start the sigreturn trampoline at
283 SIGRESTARTBLOCK_TRAMP+X. */
284 err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0,
285 &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]);
286 err |= __put_user(INSN_LDI_R20,
287 &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]);
288 err |= __put_user(INSN_BLE_SR2_R0,
289 &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]);
290 err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]);
291
292#if DEBUG_SIG
293 /* Assert that we're flushing in the correct space... */
294 {
295 unsigned long sid;
296 asm ("mfsp %%sr3,%0" : "=r" (sid));
297 DBG(1,"setup_rt_frame: Flushing 64 bytes at space %#x offset %p\n",
298 sid, frame->tramp);
299 }
300#endif
301
302 flush_user_dcache_range((unsigned long) &frame->tramp[0],
303 (unsigned long) &frame->tramp[TRAMP_SIZE]);
304 flush_user_icache_range((unsigned long) &frame->tramp[0],
305 (unsigned long) &frame->tramp[TRAMP_SIZE]);
306
307 /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP
308 * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP
309 * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP
310 */
311 rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP];
312
313 if (err)
314 return -EFAULT;
315
316 haddr = A(ksig->ka.sa.sa_handler);
317 /* The sa_handler may be a pointer to a function descriptor */
318#ifdef CONFIG_64BIT
319 if (is_compat_task()) {
320#endif
321 if (haddr & PA_PLABEL_FDESC) {
322 Elf32_Fdesc fdesc;
323 Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
324
325 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
326
327 if (err)
328 return -EFAULT;
329
330 haddr = fdesc.addr;
331 regs->gr[19] = fdesc.gp;
332 }
333#ifdef CONFIG_64BIT
334 } else {
335 Elf64_Fdesc fdesc;
336 Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
337
338 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
339
340 if (err)
341 return -EFAULT;
342
343 haddr = fdesc.addr;
344 regs->gr[19] = fdesc.gp;
345 DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
346 haddr, regs->gr[19], in_syscall);
347 }
348#endif
349
350 /* The syscall return path will create IAOQ values from r31.
351 */
352 sigframe_size = PARISC_RT_SIGFRAME_SIZE;
353#ifdef CONFIG_64BIT
354 if (is_compat_task())
355 sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
356#endif
357 if (in_syscall) {
358 regs->gr[31] = haddr;
359#ifdef CONFIG_64BIT
360 if (!test_thread_flag(TIF_32BIT))
361 sigframe_size |= 1;
362#endif
363 } else {
364 unsigned long psw = USER_PSW;
365#ifdef CONFIG_64BIT
366 if (!test_thread_flag(TIF_32BIT))
367 psw |= PSW_W;
368#endif
369
370 /* If we are singlestepping, arrange a trap to be delivered
371 when we return to userspace. Note the semantics -- we
372 should trap before the first insn in the handler is
373 executed. Ref:
374 http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
375 */
376 if (pa_psw(current)->r) {
377 pa_psw(current)->r = 0;
378 psw |= PSW_R;
379 mtctl(-1, 0);
380 }
381
382 regs->gr[0] = psw;
383 regs->iaoq[0] = haddr | 3;
384 regs->iaoq[1] = regs->iaoq[0] + 4;
385 }
386
387 regs->gr[2] = rp; /* userland return pointer */
388 regs->gr[26] = ksig->sig; /* signal number */
389
390#ifdef CONFIG_64BIT
391 if (is_compat_task()) {
392 regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
393 regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */
394 } else
395#endif
396 {
397 regs->gr[25] = A(&frame->info); /* siginfo pointer */
398 regs->gr[24] = A(&frame->uc); /* ucontext pointer */
399 }
400
401 DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n",
402 regs->gr[30], sigframe_size,
403 regs->gr[30] + sigframe_size);
404 /* Raise the user stack pointer to make a proper call frame. */
405 regs->gr[30] = (A(frame) + sigframe_size);
406
407
408 DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
409 current->comm, current->pid, frame, regs->gr[30],
410 regs->iaoq[0], regs->iaoq[1], rp);
411
412 return 0;
413}
414
415/*
416 * OK, we're invoking a handler.
417 */
418
419static void
420handle_signal(struct ksignal *ksig, struct pt_regs *regs, int in_syscall)
421{
422 int ret;
423 sigset_t *oldset = sigmask_to_save();
424
425 DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n",
426 ksig->sig, ksig->ka, ksig->info, oldset, regs);
427
428 /* Set up the stack frame */
429 ret = setup_rt_frame(ksig, oldset, regs, in_syscall);
430
431 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) ||
432 test_thread_flag(TIF_BLOCKSTEP));
433
434 DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
435 regs->gr[28]);
436}
437
438/*
439 * Check how the syscall number gets loaded into %r20 within
440 * the delay branch in userspace and adjust as needed.
441 */
442
443static void check_syscallno_in_delay_branch(struct pt_regs *regs)
444{
445 u32 opcode, source_reg;
446 u32 __user *uaddr;
447 int err;
448
449 /* Usually we don't have to restore %r20 (the system call number)
450 * because it gets loaded in the delay slot of the branch external
451 * instruction via the ldi instruction.
452 * In some cases a register-to-register copy instruction might have
453 * been used instead, in which case we need to copy the syscall
454 * number into the source register before returning to userspace.
455 */
456
457 /* A syscall is just a branch, so all we have to do is fiddle the
458 * return pointer so that the ble instruction gets executed again.
459 */
460 regs->gr[31] -= 8; /* delayed branching */
461
462 /* Get assembler opcode of code in delay branch */
463 uaddr = (unsigned int *) ((regs->gr[31] & ~3) + 4);
464 err = get_user(opcode, uaddr);
465 if (err)
466 return;
467
468 /* Check if delay branch uses "ldi int,%r20" */
469 if ((opcode & 0xffff0000) == 0x34140000)
470 return; /* everything ok, just return */
471
472 /* Check if delay branch uses "nop" */
473 if (opcode == INSN_NOP)
474 return;
475
476 /* Check if delay branch uses "copy %rX,%r20" */
477 if ((opcode & 0xffe0ffff) == 0x08000254) {
478 source_reg = (opcode >> 16) & 31;
479 regs->gr[source_reg] = regs->gr[20];
480 return;
481 }
482
483 pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n",
484 current->comm, task_pid_nr(current), opcode);
485}
486
487static inline void
488syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
489{
490 if (regs->orig_r28)
491 return;
492 regs->orig_r28 = 1; /* no more restarts */
493 /* Check the return code */
494 switch (regs->gr[28]) {
495 case -ERESTART_RESTARTBLOCK:
496 case -ERESTARTNOHAND:
497 DBG(1,"ERESTARTNOHAND: returning -EINTR\n");
498 regs->gr[28] = -EINTR;
499 break;
500
501 case -ERESTARTSYS:
502 if (!(ka->sa.sa_flags & SA_RESTART)) {
503 DBG(1,"ERESTARTSYS: putting -EINTR\n");
504 regs->gr[28] = -EINTR;
505 break;
506 }
507 /* fallthrough */
508 case -ERESTARTNOINTR:
509 check_syscallno_in_delay_branch(regs);
510 break;
511 }
512}
513
514static inline void
515insert_restart_trampoline(struct pt_regs *regs)
516{
517 if (regs->orig_r28)
518 return;
519 regs->orig_r28 = 1; /* no more restarts */
520 switch(regs->gr[28]) {
521 case -ERESTART_RESTARTBLOCK: {
522 /* Restart the system call - no handlers present */
523 unsigned int *usp = (unsigned int *)regs->gr[30];
524 unsigned long start = (unsigned long) &usp[2];
525 unsigned long end = (unsigned long) &usp[5];
526 long err = 0;
527
528 /* Setup a trampoline to restart the syscall
529 * with __NR_restart_syscall
530 *
531 * 0: <return address (orig r31)>
532 * 4: <2nd half for 64-bit>
533 * 8: ldw 0(%sp), %r31
534 * 12: be 0x100(%sr2, %r0)
535 * 16: ldi __NR_restart_syscall, %r20
536 */
537#ifdef CONFIG_64BIT
538 err |= put_user(regs->gr[31] >> 32, &usp[0]);
539 err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
540 err |= put_user(0x0fc010df, &usp[2]);
541#else
542 err |= put_user(regs->gr[31], &usp[0]);
543 err |= put_user(0x0fc0109f, &usp[2]);
544#endif
545 err |= put_user(0xe0008200, &usp[3]);
546 err |= put_user(0x34140000, &usp[4]);
547
548 WARN_ON(err);
549
550 /* flush data/instruction cache for new insns */
551 flush_user_dcache_range(start, end);
552 flush_user_icache_range(start, end);
553
554 regs->gr[31] = regs->gr[30] + 8;
555 return;
556 }
557 case -ERESTARTNOHAND:
558 case -ERESTARTSYS:
559 case -ERESTARTNOINTR:
560 check_syscallno_in_delay_branch(regs);
561 return;
562 default:
563 break;
564 }
565}
566
567/*
568 * Note that 'init' is a special process: it doesn't get signals it doesn't
569 * want to handle. Thus you cannot kill init even with a SIGKILL even by
570 * mistake.
571 *
572 * We need to be able to restore the syscall arguments (r21-r26) to
573 * restart syscalls. Thus, the syscall path should save them in the
574 * pt_regs structure (it's okay to do so since they are caller-save
575 * registers). As noted below, the syscall number gets restored for
576 * us due to the magic of delayed branching.
577 */
578asmlinkage void
579do_signal(struct pt_regs *regs, long in_syscall)
580{
581 struct ksignal ksig;
582
583 DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n",
584 regs, regs->sr[7], in_syscall);
585
586 if (get_signal(&ksig)) {
587 DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
588 /* Restart a system call if necessary. */
589 if (in_syscall)
590 syscall_restart(regs, &ksig.ka);
591
592 handle_signal(&ksig, regs, in_syscall);
593 return;
594 }
595
596 /* Did we come from a system call? */
597 if (in_syscall)
598 insert_restart_trampoline(regs);
599
600 DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n",
601 regs->gr[28]);
602
603 restore_saved_sigmask();
604}
605
606void do_notify_resume(struct pt_regs *regs, long in_syscall)
607{
608 if (test_thread_flag(TIF_SIGPENDING))
609 do_signal(regs, in_syscall);
610
611 if (test_thread_flag(TIF_NOTIFY_RESUME)) {
612 clear_thread_flag(TIF_NOTIFY_RESUME);
613 tracehook_notify_resume(regs);
614 }
615}
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}