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sparc: Fix SA_ONSTACK signal handling.
[linux-2.6-block.git] / arch / sparc64 / kernel / signal.c
CommitLineData
1da177e4
LT		 1/* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
09337f50 11#ifdef CONFIG_COMPAT
1da177e4
LT		 12#include <linux/compat.h> /* for compat_old_sigset_t */
13#endif
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/signal.h>
17#include <linux/errno.h>
18#include <linux/wait.h>
19#include <linux/ptrace.h>
20#include <linux/unistd.h>
21#include <linux/mm.h>
22#include <linux/tty.h>
1da177e4
LT		 23#include <linux/binfmts.h>
24#include <linux/bitops.h>
25
26#include <asm/uaccess.h>
27#include <asm/ptrace.h>
1da177e4
LT		 28#include <asm/pgtable.h>
29#include <asm/fpumacro.h>
30#include <asm/uctx.h>
31#include <asm/siginfo.h>
32#include <asm/visasm.h>
33
062ea6d3
DM		 34#include "entry.h"
35#include "systbls.h"
36
1da177e4
LT		 37#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38
1da177e4
LT		 39/* {set, get}context() needed for 64-bit SparcLinux userland. */
40asmlinkage void sparc64_set_context(struct pt_regs *regs)
41{
42 struct ucontext __user *ucp = (struct ucontext __user *)
43 regs->u_regs[UREG_I0];
44 mc_gregset_t __user *grp;
45 unsigned long pc, npc, tstate;
46 unsigned long fp, i7;
47 unsigned char fenab;
48 int err;
49
50 flush_user_windows();
51 if (get_thread_wsaved() ||
52 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
53 (!__access_ok(ucp, sizeof(*ucp))))
54 goto do_sigsegv;
55 grp = &ucp->uc_mcontext.mc_gregs;
56 err = __get_user(pc, &((*grp)[MC_PC]));
57 err |= __get_user(npc, &((*grp)[MC_NPC]));
58 if (err || ((pc | npc) & 3))
59 goto do_sigsegv;
60 if (regs->u_regs[UREG_I1]) {
61 sigset_t set;
62
63 if (_NSIG_WORDS == 1) {
64 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
65 goto do_sigsegv;
66 } else {
67 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
68 goto do_sigsegv;
69 }
70 sigdelsetmask(&set, ~_BLOCKABLE);
71 spin_lock_irq(&current->sighand->siglock);
72 current->blocked = set;
73 recalc_sigpending();
74 spin_unlock_irq(&current->sighand->siglock);
75 }
76 if (test_thread_flag(TIF_32BIT)) {
77 pc &= 0xffffffff;
78 npc &= 0xffffffff;
79 }
80 regs->tpc = pc;
81 regs->tnpc = npc;
82 err |= __get_user(regs->y, &((*grp)[MC_Y]));
83 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
84 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
85 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
86 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
87 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
88 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
89 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
90 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
91 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
92 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
93 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
94 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
95 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
96 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
97 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
98 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
99 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
100 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
101
102 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
103 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
104 err |= __put_user(fp,
105 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
106 err |= __put_user(i7,
107 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
108
109 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
110 if (fenab) {
111 unsigned long *fpregs = current_thread_info()->fpregs;
112 unsigned long fprs;
113
114 fprs_write(0);
115 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
116 if (fprs & FPRS_DL)
117 err |= copy_from_user(fpregs,
118 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
119 (sizeof(unsigned int) * 32));
120 if (fprs & FPRS_DU)
121 err |= copy_from_user(fpregs+16,
122 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
123 (sizeof(unsigned int) * 32));
124 err |= __get_user(current_thread_info()->xfsr[0],
125 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
126 err |= __get_user(current_thread_info()->gsr[0],
127 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
128 regs->tstate &= ~TSTATE_PEF;
129 }
130 if (err)
131 goto do_sigsegv;
132
133 return;
134do_sigsegv:
135 force_sig(SIGSEGV, current);
136}
137
138asmlinkage void sparc64_get_context(struct pt_regs *regs)
139{
140 struct ucontext __user *ucp = (struct ucontext __user *)
141 regs->u_regs[UREG_I0];
142 mc_gregset_t __user *grp;
143 mcontext_t __user *mcp;
144 unsigned long fp, i7;
145 unsigned char fenab;
146 int err;
147
148 synchronize_user_stack();
149 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
150 goto do_sigsegv;
151
152#if 1
153 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
154#else
155 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
156#endif
157
158 mcp = &ucp->uc_mcontext;
159 grp = &mcp->mc_gregs;
160
161 /* Skip over the trap instruction, first. */
162 if (test_thread_flag(TIF_32BIT)) {
163 regs->tpc = (regs->tnpc & 0xffffffff);
164 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
165 } else {
166 regs->tpc = regs->tnpc;
167 regs->tnpc += 4;
168 }
169 err = 0;
170 if (_NSIG_WORDS == 1)
171 err |= __put_user(current->blocked.sig[0],
172 (unsigned long __user *)&ucp->uc_sigmask);
173 else
174 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
175 sizeof(sigset_t));
176
177 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
178 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
179 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
180 err |= __put_user(regs->y, &((*grp)[MC_Y]));
181 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
182 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
183 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
184 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
185 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
186 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
187 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
188 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
189 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
190 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
191 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
192 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
193 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
194 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
195 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
196
197 err |= __get_user(fp,
198 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
199 err |= __get_user(i7,
200 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
201 err |= __put_user(fp, &(mcp->mc_fp));
202 err |= __put_user(i7, &(mcp->mc_i7));
203
204 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
205 if (fenab) {
206 unsigned long *fpregs = current_thread_info()->fpregs;
207 unsigned long fprs;
208
209 fprs = current_thread_info()->fpsaved[0];
210 if (fprs & FPRS_DL)
211 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
212 (sizeof(unsigned int) * 32));
213 if (fprs & FPRS_DU)
214 err |= copy_to_user(
215 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
216 (sizeof(unsigned int) * 32));
217 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
218 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
219 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
220 }
221 if (err)
222 goto do_sigsegv;
223
224 return;
225do_sigsegv:
226 force_sig(SIGSEGV, current);
227}
228
229struct rt_signal_frame {
230 struct sparc_stackf ss;
231 siginfo_t info;
232 struct pt_regs regs;
233 __siginfo_fpu_t __user *fpu_save;
234 stack_t stack;
235 sigset_t mask;
236 __siginfo_fpu_t fpu_state;
237};
238
2d7d5f05 239static long _sigpause_common(old_sigset_t set)
1da177e4 240{
1da177e4
LT		 241 set &= _BLOCKABLE;
242 spin_lock_irq(&current->sighand->siglock);
2d7d5f05 243 current->saved_sigmask = current->blocked;
1da177e4
LT		 244 siginitset(&current->blocked, set);
245 recalc_sigpending();
246 spin_unlock_irq(&current->sighand->siglock);
1da177e4 247
2d7d5f05
DM		 248 current->state = TASK_INTERRUPTIBLE;
249 schedule();
250 set_thread_flag(TIF_RESTORE_SIGMASK);
251 return -ERESTARTNOHAND;
1da177e4
LT		 252}
253
2d7d5f05 254asmlinkage long sys_sigpause(unsigned int set)
1da177e4 255{
2d7d5f05 256 return _sigpause_common(set);
1da177e4
LT		 257}
258
2d7d5f05 259asmlinkage long sys_sigsuspend(old_sigset_t set)
1da177e4 260{
2d7d5f05 261 return _sigpause_common(set);
1da177e4
LT		 262}
263
264static inline int
265restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
266{
267 unsigned long *fpregs = current_thread_info()->fpregs;
268 unsigned long fprs;
269 int err;
270
271 err = __get_user(fprs, &fpu->si_fprs);
272 fprs_write(0);
273 regs->tstate &= ~TSTATE_PEF;
274 if (fprs & FPRS_DL)
275 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
276 (sizeof(unsigned int) * 32));
277 if (fprs & FPRS_DU)
278 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
279 (sizeof(unsigned int) * 32));
280 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
281 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
282 current_thread_info()->fpsaved[0] |= fprs;
283 return err;
284}
285
286void do_rt_sigreturn(struct pt_regs *regs)
287{
288 struct rt_signal_frame __user *sf;
289 unsigned long tpc, tnpc, tstate;
290 __siginfo_fpu_t __user *fpu_save;
1da177e4 291 sigset_t set;
1da177e4
LT		 292 int err;
293
294 /* Always make any pending restarted system calls return -EINTR */
295 current_thread_info()->restart_block.fn = do_no_restart_syscall;
296
297 synchronize_user_stack ();
298 sf = (struct rt_signal_frame __user *)
299 (regs->u_regs [UREG_FP] + STACK_BIAS);
300
301 /* 1. Make sure we are not getting garbage from the user */
302 if (((unsigned long) sf) & 3)
303 goto segv;
304
305 err = get_user(tpc, &sf->regs.tpc);
306 err |= __get_user(tnpc, &sf->regs.tnpc);
307 if (test_thread_flag(TIF_32BIT)) {
308 tpc &= 0xffffffff;
309 tnpc &= 0xffffffff;
310 }
311 err |= ((tpc | tnpc) & 3);
312
313 /* 2. Restore the state */
314 err |= __get_user(regs->y, &sf->regs.y);
315 err |= __get_user(tstate, &sf->regs.tstate);
316 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
317
318 /* User can only change condition codes and %asi in %tstate. */
319 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
320 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
321
322 err |= __get_user(fpu_save, &sf->fpu_save);
323 if (fpu_save)
324 err |= restore_fpu_state(regs, &sf->fpu_state);
325
326 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
62715ec8
ON		 327 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
328
1da177e4
LT		 329 if (err)
330 goto segv;
62715ec8 331
1da177e4
LT		 332 regs->tpc = tpc;
333 regs->tnpc = tnpc;
1da177e4 334
2678fefe
DM		 335 /* Prevent syscall restart. */
336 pt_regs_clear_trap_type(regs);
337
1da177e4
LT		 338 sigdelsetmask(&set, ~_BLOCKABLE);
339 spin_lock_irq(&current->sighand->siglock);
340 current->blocked = set;
341 recalc_sigpending();
342 spin_unlock_irq(&current->sighand->siglock);
343 return;
344segv:
345 force_sig(SIGSEGV, current);
346}
347
348/* Checks if the fp is valid */
349static int invalid_frame_pointer(void __user *fp, int fplen)
350{
351 if (((unsigned long) fp) & 7)
352 return 1;
353 return 0;
354}
355
356static inline int
357save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
358{
7c3cce97 359 unsigned long *fpregs = current_thread_info()->fpregs;
1da177e4
LT		 360 unsigned long fprs;
361 int err = 0;
362
363 fprs = current_thread_info()->fpsaved[0];
364 if (fprs & FPRS_DL)
365 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
366 (sizeof(unsigned int) * 32));
367 if (fprs & FPRS_DU)
368 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
369 (sizeof(unsigned int) * 32));
370 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
371 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
372 err |= __put_user(fprs, &fpu->si_fprs);
373
374 return err;
375}
376
377static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
378{
dc5dc7e6 379 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
1da177e4 380
dc5dc7e6
DM		 381 /*
382 * If we are on the alternate signal stack and would overflow it, don't.
383 * Return an always-bogus address instead so we will die with SIGSEGV.
384 */
385 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
386 return (void __user *) -1L;
1da177e4
LT		 387
388 /* This is the X/Open sanctioned signal stack switching. */
389 if (ka->sa.sa_flags & SA_ONSTACK) {
dc5dc7e6 390 if (sas_ss_flags(sp) == 0)
1da177e4
LT		 391 sp = current->sas_ss_sp + current->sas_ss_size;
392 }
dc5dc7e6
DM		 393
394 /* Always align the stack frame. This handles two cases. First,
395 * sigaltstack need not be mindful of platform specific stack
396 * alignment. Second, if we took this signal because the stack
397 * is not aligned properly, we'd like to take the signal cleanly
398 * and report that.
399 */
400 sp &= ~7UL;
401
1da177e4
LT		 402 return (void __user *)(sp - framesize);
403}
404
405static inline void
406setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
407 int signo, sigset_t *oldset, siginfo_t *info)
408{
409 struct rt_signal_frame __user *sf;
410 int sigframe_size, err;
411
412 /* 1. Make sure everything is clean */
413 synchronize_user_stack();
414 save_and_clear_fpu();
415
7cf06995 416 sigframe_size = sizeof(struct rt_signal_frame);
1da177e4
LT		 417 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
418 sigframe_size -= sizeof(__siginfo_fpu_t);
419
420 sf = (struct rt_signal_frame __user *)
421 get_sigframe(ka, regs, sigframe_size);
422
423 if (invalid_frame_pointer (sf, sigframe_size))
424 goto sigill;
425
426 if (get_thread_wsaved() != 0)
427 goto sigill;
428
429 /* 2. Save the current process state */
430 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
431
432 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
433 err |= save_fpu_state(regs, &sf->fpu_state);
434 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
435 } else {
436 err |= __put_user(0, &sf->fpu_save);
437 }
438
439 /* Setup sigaltstack */
440 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
441 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
442 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
443
444 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
445
446 err |= copy_in_user((u64 __user *)sf,
447 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
448 sizeof(struct reg_window));
449
450 if (info)
451 err |= copy_siginfo_to_user(&sf->info, info);
452 else {
453 err |= __put_user(signo, &sf->info.si_signo);
454 err |= __put_user(SI_NOINFO, &sf->info.si_code);
455 }
456 if (err)
457 goto sigsegv;
458
459 /* 3. signal handler back-trampoline and parameters */
460 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
461 regs->u_regs[UREG_I0] = signo;
462 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
463
464 /* The sigcontext is passed in this way because of how it
465 * is defined in GLIBC's /usr/include/bits/sigcontext.h
466 * for sparc64. It includes the 128 bytes of siginfo_t.
467 */
468 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
469
470 /* 5. signal handler */
471 regs->tpc = (unsigned long) ka->sa.sa_handler;
472 regs->tnpc = (regs->tpc + 4);
473 if (test_thread_flag(TIF_32BIT)) {
474 regs->tpc &= 0xffffffff;
475 regs->tnpc &= 0xffffffff;
476 }
477 /* 4. return to kernel instructions */
478 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
479 return;
480
481sigill:
482 do_exit(SIGILL);
483sigsegv:
484 force_sigsegv(signo, current);
485}
486
487static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
488 siginfo_t *info,
489 sigset_t *oldset, struct pt_regs *regs)
490{
491 setup_rt_frame(ka, regs, signr, oldset,
492 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
69be8f18
SR		 493 spin_lock_irq(&current->sighand->siglock);
494 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
495 if (!(ka->sa.sa_flags & SA_NOMASK))
1da177e4 496 sigaddset(&current->blocked,signr);
69be8f18
SR		 497 recalc_sigpending();
498 spin_unlock_irq(&current->sighand->siglock);
1da177e4
LT		 499}
500
501static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
502 struct sigaction *sa)
503{
504 switch (regs->u_regs[UREG_I0]) {
505 case ERESTART_RESTARTBLOCK:
506 case ERESTARTNOHAND:
507 no_system_call_restart:
508 regs->u_regs[UREG_I0] = EINTR;
509 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
510 break;
511 case ERESTARTSYS:
512 if (!(sa->sa_flags & SA_RESTART))
513 goto no_system_call_restart;
514 /* fallthrough */
515 case ERESTARTNOINTR:
516 regs->u_regs[UREG_I0] = orig_i0;
517 regs->tpc -= 4;
518 regs->tnpc -= 4;
519 }
520}
521
522/* Note that 'init' is a special process: it doesn't get signals it doesn't
523 * want to handle. Thus you cannot kill init even with a SIGKILL even by
524 * mistake.
525 */
238468b2 526static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
1da177e4 527{
1da177e4
LT		 528 struct signal_deliver_cookie cookie;
529 struct k_sigaction ka;
2d7d5f05 530 sigset_t *oldset;
238468b2 531 siginfo_t info;
90888816 532 int signr;
1da177e4 533
2678fefe
DM		 534 if (pt_regs_is_syscall(regs) &&
535 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
90888816 536 pt_regs_clear_trap_type(regs);
238468b2
DM		 537 cookie.restart_syscall = 1;
538 } else
539 cookie.restart_syscall = 0;
1da177e4
LT		 540 cookie.orig_i0 = orig_i0;
541
2d7d5f05
DM		 542 if (test_thread_flag(TIF_RESTORE_SIGMASK))
543 oldset = &current->saved_sigmask;
544 else
1da177e4
LT		 545 oldset = &current->blocked;
546
09337f50 547#ifdef CONFIG_COMPAT
1da177e4 548 if (test_thread_flag(TIF_32BIT)) {
2d7d5f05 549 extern void do_signal32(sigset_t *, struct pt_regs *,
238468b2
DM		 550 struct signal_deliver_cookie *);
551 do_signal32(oldset, regs, &cookie);
2d7d5f05 552 return;
1da177e4
LT		 553 }
554#endif
555
556 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
557 if (signr > 0) {
558 if (cookie.restart_syscall)
238468b2 559 syscall_restart(cookie.orig_i0, regs, &ka.sa);
1da177e4 560 handle_signal(signr, &ka, &info, oldset, regs);
2d7d5f05
DM		 561
562 /* a signal was successfully delivered; the saved
563 * sigmask will have been stored in the signal frame,
564 * and will be restored by sigreturn, so we can simply
565 * clear the TIF_RESTORE_SIGMASK flag.
566 */
567 if (test_thread_flag(TIF_RESTORE_SIGMASK))
568 clear_thread_flag(TIF_RESTORE_SIGMASK);
569 return;
1da177e4
LT		 570 }
571 if (cookie.restart_syscall &&
572 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
573 regs->u_regs[UREG_I0] == ERESTARTSYS ||
574 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
575 /* replay the system call when we are done */
576 regs->u_regs[UREG_I0] = cookie.orig_i0;
577 regs->tpc -= 4;
578 regs->tnpc -= 4;
579 }
580 if (cookie.restart_syscall &&
581 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
582 regs->u_regs[UREG_G1] = __NR_restart_syscall;
583 regs->tpc -= 4;
584 regs->tnpc -= 4;
585 }
2d7d5f05
DM		 586
587 /* if there's no signal to deliver, we just put the saved sigmask
588 * back
589 */
590 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
591 clear_thread_flag(TIF_RESTORE_SIGMASK);
592 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
593 }
1da177e4
LT		 594}
595
7697daaa 596void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
1da177e4 597{
2d7d5f05 598 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
238468b2 599 do_signal(regs, orig_i0);
1da177e4
LT		 600}
601
602void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
603{
604 struct signal_deliver_cookie *cp = cookie;
605
606 if (cp->restart_syscall &&
607 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
608 regs->u_regs[UREG_I0] == ERESTARTSYS ||
609 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
610 /* replay the system call when we are done */
611 regs->u_regs[UREG_I0] = cp->orig_i0;
612 regs->tpc -= 4;
613 regs->tnpc -= 4;
614 cp->restart_syscall = 0;
615 }
616 if (cp->restart_syscall &&
617 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
618 regs->u_regs[UREG_G1] = __NR_restart_syscall;
619 regs->tpc -= 4;
620 regs->tnpc -= 4;
621 cp->restart_syscall = 0;
622 }
623}
Linux 6.x block layer and io_uring tree(s)