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sparc64: remove unused calc_npages() in iommu_common.h
[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
1da177e4
LT		 11#ifdef CONFIG_SPARC32_COMPAT
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>
28#include <asm/svr4.h>
29#include <asm/pgtable.h>
30#include <asm/fpumacro.h>
31#include <asm/uctx.h>
32#include <asm/siginfo.h>
33#include <asm/visasm.h>
34
062ea6d3
DM		 35#include "entry.h"
36#include "systbls.h"
37
1da177e4
LT		 38#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39
1da177e4
LT		 40/* {set, get}context() needed for 64-bit SparcLinux userland. */
41asmlinkage void sparc64_set_context(struct pt_regs *regs)
42{
43 struct ucontext __user *ucp = (struct ucontext __user *)
44 regs->u_regs[UREG_I0];
45 mc_gregset_t __user *grp;
46 unsigned long pc, npc, tstate;
47 unsigned long fp, i7;
48 unsigned char fenab;
49 int err;
50
51 flush_user_windows();
52 if (get_thread_wsaved() ||
53 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
54 (!__access_ok(ucp, sizeof(*ucp))))
55 goto do_sigsegv;
56 grp = &ucp->uc_mcontext.mc_gregs;
57 err = __get_user(pc, &((*grp)[MC_PC]));
58 err |= __get_user(npc, &((*grp)[MC_NPC]));
59 if (err || ((pc | npc) & 3))
60 goto do_sigsegv;
61 if (regs->u_regs[UREG_I1]) {
62 sigset_t set;
63
64 if (_NSIG_WORDS == 1) {
65 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
66 goto do_sigsegv;
67 } else {
68 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
69 goto do_sigsegv;
70 }
71 sigdelsetmask(&set, ~_BLOCKABLE);
72 spin_lock_irq(&current->sighand->siglock);
73 current->blocked = set;
74 recalc_sigpending();
75 spin_unlock_irq(&current->sighand->siglock);
76 }
77 if (test_thread_flag(TIF_32BIT)) {
78 pc &= 0xffffffff;
79 npc &= 0xffffffff;
80 }
81 regs->tpc = pc;
82 regs->tnpc = npc;
83 err |= __get_user(regs->y, &((*grp)[MC_Y]));
84 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
85 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
86 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
87 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
88 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
89 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
90 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
91 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
92 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
93 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
94 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
95 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
96 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
97 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
98 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
99 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
100 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
101 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
102
103 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
104 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
105 err |= __put_user(fp,
106 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
107 err |= __put_user(i7,
108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
109
110 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
111 if (fenab) {
112 unsigned long *fpregs = current_thread_info()->fpregs;
113 unsigned long fprs;
114
115 fprs_write(0);
116 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
117 if (fprs & FPRS_DL)
118 err |= copy_from_user(fpregs,
119 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
120 (sizeof(unsigned int) * 32));
121 if (fprs & FPRS_DU)
122 err |= copy_from_user(fpregs+16,
123 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
124 (sizeof(unsigned int) * 32));
125 err |= __get_user(current_thread_info()->xfsr[0],
126 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
127 err |= __get_user(current_thread_info()->gsr[0],
128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
129 regs->tstate &= ~TSTATE_PEF;
130 }
131 if (err)
132 goto do_sigsegv;
133
134 return;
135do_sigsegv:
136 force_sig(SIGSEGV, current);
137}
138
139asmlinkage void sparc64_get_context(struct pt_regs *regs)
140{
141 struct ucontext __user *ucp = (struct ucontext __user *)
142 regs->u_regs[UREG_I0];
143 mc_gregset_t __user *grp;
144 mcontext_t __user *mcp;
145 unsigned long fp, i7;
146 unsigned char fenab;
147 int err;
148
149 synchronize_user_stack();
150 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
151 goto do_sigsegv;
152
153#if 1
154 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
155#else
156 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
157#endif
158
159 mcp = &ucp->uc_mcontext;
160 grp = &mcp->mc_gregs;
161
162 /* Skip over the trap instruction, first. */
163 if (test_thread_flag(TIF_32BIT)) {
164 regs->tpc = (regs->tnpc & 0xffffffff);
165 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
166 } else {
167 regs->tpc = regs->tnpc;
168 regs->tnpc += 4;
169 }
170 err = 0;
171 if (_NSIG_WORDS == 1)
172 err |= __put_user(current->blocked.sig[0],
173 (unsigned long __user *)&ucp->uc_sigmask);
174 else
175 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
176 sizeof(sigset_t));
177
178 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
179 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
180 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
181 err |= __put_user(regs->y, &((*grp)[MC_Y]));
182 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
183 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
184 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
185 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
186 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
187 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
188 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
189 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
190 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
191 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
192 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
193 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
194 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
195 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
196 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
197
198 err |= __get_user(fp,
199 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
200 err |= __get_user(i7,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
202 err |= __put_user(fp, &(mcp->mc_fp));
203 err |= __put_user(i7, &(mcp->mc_i7));
204
205 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
206 if (fenab) {
207 unsigned long *fpregs = current_thread_info()->fpregs;
208 unsigned long fprs;
209
210 fprs = current_thread_info()->fpsaved[0];
211 if (fprs & FPRS_DL)
212 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
213 (sizeof(unsigned int) * 32));
214 if (fprs & FPRS_DU)
215 err |= copy_to_user(
216 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
217 (sizeof(unsigned int) * 32));
218 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
219 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
220 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
221 }
222 if (err)
223 goto do_sigsegv;
224
225 return;
226do_sigsegv:
227 force_sig(SIGSEGV, current);
228}
229
230struct rt_signal_frame {
231 struct sparc_stackf ss;
232 siginfo_t info;
233 struct pt_regs regs;
234 __siginfo_fpu_t __user *fpu_save;
235 stack_t stack;
236 sigset_t mask;
237 __siginfo_fpu_t fpu_state;
238};
239
240/* Align macros */
241#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
242
2d7d5f05 243static long _sigpause_common(old_sigset_t set)
1da177e4 244{
1da177e4
LT		 245 set &= _BLOCKABLE;
246 spin_lock_irq(&current->sighand->siglock);
2d7d5f05 247 current->saved_sigmask = current->blocked;
1da177e4
LT		 248 siginitset(&current->blocked, set);
249 recalc_sigpending();
250 spin_unlock_irq(&current->sighand->siglock);
1da177e4 251
2d7d5f05
DM		 252 current->state = TASK_INTERRUPTIBLE;
253 schedule();
254 set_thread_flag(TIF_RESTORE_SIGMASK);
255 return -ERESTARTNOHAND;
1da177e4
LT		 256}
257
2d7d5f05 258asmlinkage long sys_sigpause(unsigned int set)
1da177e4 259{
2d7d5f05 260 return _sigpause_common(set);
1da177e4
LT		 261}
262
2d7d5f05 263asmlinkage long sys_sigsuspend(old_sigset_t set)
1da177e4 264{
2d7d5f05 265 return _sigpause_common(set);
1da177e4
LT		 266}
267
268static inline int
269restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
270{
271 unsigned long *fpregs = current_thread_info()->fpregs;
272 unsigned long fprs;
273 int err;
274
275 err = __get_user(fprs, &fpu->si_fprs);
276 fprs_write(0);
277 regs->tstate &= ~TSTATE_PEF;
278 if (fprs & FPRS_DL)
279 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
280 (sizeof(unsigned int) * 32));
281 if (fprs & FPRS_DU)
282 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
283 (sizeof(unsigned int) * 32));
284 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
285 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
286 current_thread_info()->fpsaved[0] |= fprs;
287 return err;
288}
289
290void do_rt_sigreturn(struct pt_regs *regs)
291{
292 struct rt_signal_frame __user *sf;
293 unsigned long tpc, tnpc, tstate;
294 __siginfo_fpu_t __user *fpu_save;
1da177e4 295 sigset_t set;
1da177e4
LT		 296 int err;
297
298 /* Always make any pending restarted system calls return -EINTR */
299 current_thread_info()->restart_block.fn = do_no_restart_syscall;
300
301 synchronize_user_stack ();
302 sf = (struct rt_signal_frame __user *)
303 (regs->u_regs [UREG_FP] + STACK_BIAS);
304
305 /* 1. Make sure we are not getting garbage from the user */
306 if (((unsigned long) sf) & 3)
307 goto segv;
308
309 err = get_user(tpc, &sf->regs.tpc);
310 err |= __get_user(tnpc, &sf->regs.tnpc);
311 if (test_thread_flag(TIF_32BIT)) {
312 tpc &= 0xffffffff;
313 tnpc &= 0xffffffff;
314 }
315 err |= ((tpc | tnpc) & 3);
316
317 /* 2. Restore the state */
318 err |= __get_user(regs->y, &sf->regs.y);
319 err |= __get_user(tstate, &sf->regs.tstate);
320 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
321
322 /* User can only change condition codes and %asi in %tstate. */
323 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
324 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
325
326 err |= __get_user(fpu_save, &sf->fpu_save);
327 if (fpu_save)
328 err |= restore_fpu_state(regs, &sf->fpu_state);
329
330 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
62715ec8
ON		 331 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
332
1da177e4
LT		 333 if (err)
334 goto segv;
62715ec8 335
1da177e4
LT		 336 regs->tpc = tpc;
337 regs->tnpc = tnpc;
1da177e4
LT		 338
339 sigdelsetmask(&set, ~_BLOCKABLE);
340 spin_lock_irq(&current->sighand->siglock);
341 current->blocked = set;
342 recalc_sigpending();
343 spin_unlock_irq(&current->sighand->siglock);
344 return;
345segv:
346 force_sig(SIGSEGV, current);
347}
348
349/* Checks if the fp is valid */
350static int invalid_frame_pointer(void __user *fp, int fplen)
351{
352 if (((unsigned long) fp) & 7)
353 return 1;
354 return 0;
355}
356
357static inline int
358save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
359{
360 unsigned long *fpregs = (unsigned long *)(regs+1);
361 unsigned long fprs;
362 int err = 0;
363
364 fprs = current_thread_info()->fpsaved[0];
365 if (fprs & FPRS_DL)
366 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
367 (sizeof(unsigned int) * 32));
368 if (fprs & FPRS_DU)
369 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
370 (sizeof(unsigned int) * 32));
371 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
372 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
373 err |= __put_user(fprs, &fpu->si_fprs);
374
375 return err;
376}
377
378static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
379{
380 unsigned long sp;
381
382 sp = regs->u_regs[UREG_FP] + STACK_BIAS;
383
384 /* This is the X/Open sanctioned signal stack switching. */
385 if (ka->sa.sa_flags & SA_ONSTACK) {
386 if (!on_sig_stack(sp) &&
387 !((current->sas_ss_sp + current->sas_ss_size) & 7))
388 sp = current->sas_ss_sp + current->sas_ss_size;
389 }
390 return (void __user *)(sp - framesize);
391}
392
393static inline void
394setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
395 int signo, sigset_t *oldset, siginfo_t *info)
396{
397 struct rt_signal_frame __user *sf;
398 int sigframe_size, err;
399
400 /* 1. Make sure everything is clean */
401 synchronize_user_stack();
402 save_and_clear_fpu();
403
404 sigframe_size = RT_ALIGNEDSZ;
405 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
406 sigframe_size -= sizeof(__siginfo_fpu_t);
407
408 sf = (struct rt_signal_frame __user *)
409 get_sigframe(ka, regs, sigframe_size);
410
411 if (invalid_frame_pointer (sf, sigframe_size))
412 goto sigill;
413
414 if (get_thread_wsaved() != 0)
415 goto sigill;
416
417 /* 2. Save the current process state */
418 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
419
420 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
421 err |= save_fpu_state(regs, &sf->fpu_state);
422 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
423 } else {
424 err |= __put_user(0, &sf->fpu_save);
425 }
426
427 /* Setup sigaltstack */
428 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
429 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
430 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
431
432 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
433
434 err |= copy_in_user((u64 __user *)sf,
435 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
436 sizeof(struct reg_window));
437
438 if (info)
439 err |= copy_siginfo_to_user(&sf->info, info);
440 else {
441 err |= __put_user(signo, &sf->info.si_signo);
442 err |= __put_user(SI_NOINFO, &sf->info.si_code);
443 }
444 if (err)
445 goto sigsegv;
446
447 /* 3. signal handler back-trampoline and parameters */
448 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
449 regs->u_regs[UREG_I0] = signo;
450 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
451
452 /* The sigcontext is passed in this way because of how it
453 * is defined in GLIBC's /usr/include/bits/sigcontext.h
454 * for sparc64. It includes the 128 bytes of siginfo_t.
455 */
456 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457
458 /* 5. signal handler */
459 regs->tpc = (unsigned long) ka->sa.sa_handler;
460 regs->tnpc = (regs->tpc + 4);
461 if (test_thread_flag(TIF_32BIT)) {
462 regs->tpc &= 0xffffffff;
463 regs->tnpc &= 0xffffffff;
464 }
465 /* 4. return to kernel instructions */
466 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
467 return;
468
469sigill:
470 do_exit(SIGILL);
471sigsegv:
472 force_sigsegv(signo, current);
473}
474
475static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
476 siginfo_t *info,
477 sigset_t *oldset, struct pt_regs *regs)
478{
479 setup_rt_frame(ka, regs, signr, oldset,
480 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
69be8f18
SR		 481 spin_lock_irq(&current->sighand->siglock);
482 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
483 if (!(ka->sa.sa_flags & SA_NOMASK))
1da177e4 484 sigaddset(&current->blocked,signr);
69be8f18
SR		 485 recalc_sigpending();
486 spin_unlock_irq(&current->sighand->siglock);
1da177e4
LT		 487}
488
489static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
490 struct sigaction *sa)
491{
492 switch (regs->u_regs[UREG_I0]) {
493 case ERESTART_RESTARTBLOCK:
494 case ERESTARTNOHAND:
495 no_system_call_restart:
496 regs->u_regs[UREG_I0] = EINTR;
497 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
498 break;
499 case ERESTARTSYS:
500 if (!(sa->sa_flags & SA_RESTART))
501 goto no_system_call_restart;
502 /* fallthrough */
503 case ERESTARTNOINTR:
504 regs->u_regs[UREG_I0] = orig_i0;
505 regs->tpc -= 4;
506 regs->tnpc -= 4;
507 }
508}
509
510/* Note that 'init' is a special process: it doesn't get signals it doesn't
511 * want to handle. Thus you cannot kill init even with a SIGKILL even by
512 * mistake.
513 */
2d7d5f05 514static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
1da177e4
LT		 515{
516 siginfo_t info;
517 struct signal_deliver_cookie cookie;
518 struct k_sigaction ka;
519 int signr;
2d7d5f05 520 sigset_t *oldset;
1da177e4
LT		 521
522 cookie.restart_syscall = restart_syscall;
523 cookie.orig_i0 = orig_i0;
524
2d7d5f05
DM		 525 if (test_thread_flag(TIF_RESTORE_SIGMASK))
526 oldset = &current->saved_sigmask;
527 else
1da177e4
LT		 528 oldset = &current->blocked;
529
530#ifdef CONFIG_SPARC32_COMPAT
531 if (test_thread_flag(TIF_32BIT)) {
2d7d5f05
DM		 532 extern void do_signal32(sigset_t *, struct pt_regs *,
533 unsigned long, int);
534 do_signal32(oldset, regs, orig_i0,
535 cookie.restart_syscall);
536 return;
1da177e4
LT		 537 }
538#endif
539
540 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
541 if (signr > 0) {
542 if (cookie.restart_syscall)
543 syscall_restart(orig_i0, regs, &ka.sa);
544 handle_signal(signr, &ka, &info, oldset, regs);
2d7d5f05
DM		 545
546 /* a signal was successfully delivered; the saved
547 * sigmask will have been stored in the signal frame,
548 * and will be restored by sigreturn, so we can simply
549 * clear the TIF_RESTORE_SIGMASK flag.
550 */
551 if (test_thread_flag(TIF_RESTORE_SIGMASK))
552 clear_thread_flag(TIF_RESTORE_SIGMASK);
553 return;
1da177e4
LT		 554 }
555 if (cookie.restart_syscall &&
556 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
557 regs->u_regs[UREG_I0] == ERESTARTSYS ||
558 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
559 /* replay the system call when we are done */
560 regs->u_regs[UREG_I0] = cookie.orig_i0;
561 regs->tpc -= 4;
562 regs->tnpc -= 4;
563 }
564 if (cookie.restart_syscall &&
565 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
566 regs->u_regs[UREG_G1] = __NR_restart_syscall;
567 regs->tpc -= 4;
568 regs->tnpc -= 4;
569 }
2d7d5f05
DM		 570
571 /* if there's no signal to deliver, we just put the saved sigmask
572 * back
573 */
574 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
575 clear_thread_flag(TIF_RESTORE_SIGMASK);
576 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
577 }
1da177e4
LT		 578}
579
2d7d5f05 580void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
1da177e4
LT		 581 unsigned long thread_info_flags)
582{
2d7d5f05
DM		 583 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
584 do_signal(regs, orig_i0, restart_syscall);
1da177e4
LT		 585}
586
587void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
588{
589 struct signal_deliver_cookie *cp = cookie;
590
591 if (cp->restart_syscall &&
592 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
593 regs->u_regs[UREG_I0] == ERESTARTSYS ||
594 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
595 /* replay the system call when we are done */
596 regs->u_regs[UREG_I0] = cp->orig_i0;
597 regs->tpc -= 4;
598 regs->tnpc -= 4;
599 cp->restart_syscall = 0;
600 }
601 if (cp->restart_syscall &&
602 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
603 regs->u_regs[UREG_G1] = __NR_restart_syscall;
604 regs->tpc -= 4;
605 regs->tnpc -= 4;
606 cp->restart_syscall = 0;
607 }
608}
Linux 6.x block layer and io_uring tree(s)