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
70 static long
restore_sigcontext(struct sigcontext __user * sc,struct pt_regs * regs)71 restore_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
86 void
sys_rt_sigreturn(struct pt_regs * regs,int in_syscall)87 sys_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
164 give_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
174 static inline void __user *
get_sigframe(struct k_sigaction * ka,unsigned long sp,size_t frame_size)175 get_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
192 static long
setup_sigcontext(struct sigcontext __user * sc,struct pt_regs * regs,int in_syscall)193 setup_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
226 static long
setup_rt_frame(struct ksignal * ksig,sigset_t * set,struct pt_regs * regs,int in_syscall)227 setup_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 sigframe_size = PARISC_RT_SIGFRAME_SIZE;
241 #ifdef CONFIG_64BIT
242 if (is_compat_task()) {
243 /* The gcc alloca implementation leaves garbage in the upper 32 bits of sp */
244 usp = (compat_uint_t)usp;
245 sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
246 }
247 #endif
248 frame = get_sigframe(&ksig->ka, usp, sigframe_size);
249
250 DBG(1,"SETUP_RT_FRAME: START\n");
251 DBG(1,"setup_rt_frame: frame %p info %p\n", frame, ksig->info);
252
253 start = (unsigned long) frame;
254 if (start >= user_addr_max() - sigframe_size)
255 return -EFAULT;
256
257 #ifdef CONFIG_64BIT
258
259 compat_frame = (struct compat_rt_sigframe __user *)frame;
260
261 if (is_compat_task()) {
262 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
263 err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info);
264 err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]);
265 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc);
266 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext);
267 err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
268 &compat_frame->regs, regs, in_syscall);
269 err |= put_compat_sigset(&compat_frame->uc.uc_sigmask, set,
270 sizeof(compat_sigset_t));
271 } else
272 #endif
273 {
274 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info);
275 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
276 err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]);
277 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc);
278 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext);
279 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
280 /* FIXME: Should probably be converted as well for the compat case */
281 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
282 }
283
284 if (err)
285 return -EFAULT;
286
287 /* Set up to return from userspace. If provided, use a stub
288 already in userspace. The first words of tramp are used to
289 save the previous sigrestartblock trampoline that might be
290 on the stack. We start the sigreturn trampoline at
291 SIGRESTARTBLOCK_TRAMP. */
292 err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0,
293 &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]);
294 err |= __put_user(INSN_BLE_SR2_R0,
295 &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]);
296 err |= __put_user(INSN_LDI_R20,
297 &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]);
298
299 start = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP+0];
300 end = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP+3];
301 flush_user_dcache_range_asm(start, end);
302 flush_user_icache_range_asm(start, end);
303
304 /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP
305 * TRAMP Words 5-7, Length 3 = SIGRETURN_TRAMP
306 * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP
307 */
308 rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP];
309
310 if (err)
311 return -EFAULT;
312
313 haddr = A(ksig->ka.sa.sa_handler);
314 /* The sa_handler may be a pointer to a function descriptor */
315 #ifdef CONFIG_64BIT
316 if (is_compat_task()) {
317 #endif
318 if (haddr & PA_PLABEL_FDESC) {
319 Elf32_Fdesc fdesc;
320 Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
321
322 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
323
324 if (err)
325 return -EFAULT;
326
327 haddr = fdesc.addr;
328 regs->gr[19] = fdesc.gp;
329 }
330 #ifdef CONFIG_64BIT
331 } else {
332 Elf64_Fdesc fdesc;
333 Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
334
335 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
336
337 if (err)
338 return -EFAULT;
339
340 haddr = fdesc.addr;
341 regs->gr[19] = fdesc.gp;
342 DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
343 haddr, regs->gr[19], in_syscall);
344 }
345 #endif
346
347 /* The syscall return path will create IAOQ values from r31.
348 */
349 if (in_syscall) {
350 regs->gr[31] = haddr;
351 #ifdef CONFIG_64BIT
352 if (!test_thread_flag(TIF_32BIT))
353 sigframe_size |= 1;
354 #endif
355 } else {
356 unsigned long psw = USER_PSW;
357 #ifdef CONFIG_64BIT
358 if (!test_thread_flag(TIF_32BIT))
359 psw |= PSW_W;
360 #endif
361
362 /* If we are singlestepping, arrange a trap to be delivered
363 when we return to userspace. Note the semantics -- we
364 should trap before the first insn in the handler is
365 executed. Ref:
366 http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
367 */
368 if (pa_psw(current)->r) {
369 pa_psw(current)->r = 0;
370 psw |= PSW_R;
371 mtctl(-1, 0);
372 }
373
374 regs->gr[0] = psw;
375 regs->iaoq[0] = haddr | 3;
376 regs->iaoq[1] = regs->iaoq[0] + 4;
377 }
378
379 regs->gr[2] = rp; /* userland return pointer */
380 regs->gr[26] = ksig->sig; /* signal number */
381
382 #ifdef CONFIG_64BIT
383 if (is_compat_task()) {
384 regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
385 regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */
386 } else
387 #endif
388 {
389 regs->gr[25] = A(&frame->info); /* siginfo pointer */
390 regs->gr[24] = A(&frame->uc); /* ucontext pointer */
391 }
392
393 DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n",
394 regs->gr[30], sigframe_size,
395 regs->gr[30] + sigframe_size);
396 /* Raise the user stack pointer to make a proper call frame. */
397 regs->gr[30] = (A(frame) + sigframe_size);
398
399
400 DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
401 current->comm, current->pid, frame, regs->gr[30],
402 regs->iaoq[0], regs->iaoq[1], rp);
403
404 return 0;
405 }
406
407 /*
408 * OK, we're invoking a handler.
409 */
410
411 static void
handle_signal(struct ksignal * ksig,struct pt_regs * regs,int in_syscall)412 handle_signal(struct ksignal *ksig, struct pt_regs *regs, int in_syscall)
413 {
414 int ret;
415 sigset_t *oldset = sigmask_to_save();
416
417 DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n",
418 ksig->sig, ksig->ka, ksig->info, oldset, regs);
419
420 /* Set up the stack frame */
421 ret = setup_rt_frame(ksig, oldset, regs, in_syscall);
422
423 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) ||
424 test_thread_flag(TIF_BLOCKSTEP));
425
426 DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n",
427 regs->gr[28]);
428 }
429
430 /*
431 * Check how the syscall number gets loaded into %r20 within
432 * the delay branch in userspace and adjust as needed.
433 */
434
check_syscallno_in_delay_branch(struct pt_regs * regs)435 static void check_syscallno_in_delay_branch(struct pt_regs *regs)
436 {
437 u32 opcode, source_reg;
438 u32 __user *uaddr;
439 int err;
440
441 /* Usually we don't have to restore %r20 (the system call number)
442 * because it gets loaded in the delay slot of the branch external
443 * instruction via the ldi instruction.
444 * In some cases a register-to-register copy instruction might have
445 * been used instead, in which case we need to copy the syscall
446 * number into the source register before returning to userspace.
447 */
448
449 /* A syscall is just a branch, so all we have to do is fiddle the
450 * return pointer so that the ble instruction gets executed again.
451 */
452 regs->gr[31] -= 8; /* delayed branching */
453
454 /* Get assembler opcode of code in delay branch */
455 uaddr = (unsigned int *) ((regs->gr[31] & ~3) + 4);
456 err = get_user(opcode, uaddr);
457 if (err)
458 return;
459
460 /* Check if delay branch uses "ldi int,%r20" */
461 if ((opcode & 0xffff0000) == 0x34140000)
462 return; /* everything ok, just return */
463
464 /* Check if delay branch uses "nop" */
465 if (opcode == INSN_NOP)
466 return;
467
468 /* Check if delay branch uses "copy %rX,%r20" */
469 if ((opcode & 0xffe0ffff) == 0x08000254) {
470 source_reg = (opcode >> 16) & 31;
471 regs->gr[source_reg] = regs->gr[20];
472 return;
473 }
474
475 pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n",
476 current->comm, task_pid_nr(current), opcode);
477 }
478
479 static inline void
syscall_restart(struct pt_regs * regs,struct k_sigaction * ka)480 syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
481 {
482 if (regs->orig_r28)
483 return;
484 regs->orig_r28 = 1; /* no more restarts */
485 /* Check the return code */
486 switch (regs->gr[28]) {
487 case -ERESTART_RESTARTBLOCK:
488 case -ERESTARTNOHAND:
489 DBG(1,"ERESTARTNOHAND: returning -EINTR\n");
490 regs->gr[28] = -EINTR;
491 break;
492 case -ERESTARTSYS:
493 if (!(ka->sa.sa_flags & SA_RESTART)) {
494 DBG(1,"ERESTARTSYS: putting -EINTR\n");
495 regs->gr[28] = -EINTR;
496 break;
497 }
498 fallthrough;
499 case -ERESTARTNOINTR:
500 check_syscallno_in_delay_branch(regs);
501 break;
502 }
503 }
504
505 static inline void
insert_restart_trampoline(struct pt_regs * regs)506 insert_restart_trampoline(struct pt_regs *regs)
507 {
508 if (regs->orig_r28)
509 return;
510 regs->orig_r28 = 1; /* no more restarts */
511 switch(regs->gr[28]) {
512 case -ERESTART_RESTARTBLOCK: {
513 /* Restart the system call - no handlers present */
514 unsigned int *usp = (unsigned int *)regs->gr[30];
515 unsigned long start = (unsigned long) &usp[2];
516 unsigned long end = (unsigned long) &usp[5];
517 long err = 0;
518
519 /* check that we don't exceed the stack */
520 if (A(&usp[0]) >= user_addr_max() - 5 * sizeof(int))
521 return;
522
523 /* Setup a trampoline to restart the syscall
524 * with __NR_restart_syscall
525 *
526 * 0: <return address (orig r31)>
527 * 4: <2nd half for 64-bit>
528 * 8: ldw 0(%sp), %r31
529 * 12: be 0x100(%sr2, %r0)
530 * 16: ldi __NR_restart_syscall, %r20
531 */
532 #ifdef CONFIG_64BIT
533 err |= put_user(regs->gr[31] >> 32, &usp[0]);
534 err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
535 err |= put_user(0x0fc010df, &usp[2]);
536 #else
537 err |= put_user(regs->gr[31], &usp[0]);
538 err |= put_user(0x0fc0109f, &usp[2]);
539 #endif
540 err |= put_user(0xe0008200, &usp[3]);
541 err |= put_user(0x34140000, &usp[4]);
542
543 WARN_ON(err);
544
545 /* flush data/instruction cache for new insns */
546 flush_user_dcache_range_asm(start, end);
547 flush_user_icache_range_asm(start, end);
548
549 regs->gr[31] = regs->gr[30] + 8;
550 return;
551 }
552 case -ERESTARTNOHAND:
553 case -ERESTARTSYS:
554 case -ERESTARTNOINTR:
555 check_syscallno_in_delay_branch(regs);
556 return;
557 default:
558 break;
559 }
560 }
561
562 /*
563 * We need to be able to restore the syscall arguments (r21-r26) to
564 * restart syscalls. Thus, the syscall path should save them in the
565 * pt_regs structure (it's okay to do so since they are caller-save
566 * registers). As noted below, the syscall number gets restored for
567 * us due to the magic of delayed branching.
568 */
569 asmlinkage void
do_signal(struct pt_regs * regs,long in_syscall)570 do_signal(struct pt_regs *regs, long in_syscall)
571 {
572 struct ksignal ksig;
573
574 DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n",
575 regs, regs->sr[7], in_syscall);
576
577 if (get_signal(&ksig)) {
578 DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]);
579 /* Restart a system call if necessary. */
580 if (in_syscall)
581 syscall_restart(regs, &ksig.ka);
582
583 handle_signal(&ksig, regs, in_syscall);
584 return;
585 }
586
587 /* Did we come from a system call? */
588 if (in_syscall)
589 insert_restart_trampoline(regs);
590
591 DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n",
592 regs->gr[28]);
593
594 restore_saved_sigmask();
595 }
596
do_notify_resume(struct pt_regs * regs,long in_syscall)597 void do_notify_resume(struct pt_regs *regs, long in_syscall)
598 {
599 if (test_thread_flag(TIF_SIGPENDING) ||
600 test_thread_flag(TIF_NOTIFY_SIGNAL))
601 do_signal(regs, in_syscall);
602
603 if (test_thread_flag(TIF_NOTIFY_RESUME))
604 tracehook_notify_resume(regs);
605 }
606
