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