Commit | Line | Data |
---|---|---|
5526b7e4 | 1 | /* linux/arch/sparc/kernel/signal.c |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) | |
6 | * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/sched.h> |
10 | #include <linux/kernel.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/wait.h> | |
14 | #include <linux/ptrace.h> | |
15 | #include <linux/unistd.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/tty.h> | |
18 | #include <linux/smp.h> | |
1da177e4 LT |
19 | #include <linux/binfmts.h> /* do_coredum */ |
20 | #include <linux/bitops.h> | |
5a157d5b | 21 | #include <linux/tracehook.h> |
1da177e4 LT |
22 | |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/ptrace.h> | |
1da177e4 LT |
25 | #include <asm/pgalloc.h> |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/cacheflush.h> /* flush_sig_insns */ | |
d550bbd4 | 28 | #include <asm/switch_to.h> |
1da177e4 | 29 | |
5598473a | 30 | #include "sigutil.h" |
529b17a9 | 31 | #include "kernel.h" |
5598473a | 32 | |
1da177e4 LT |
33 | extern void fpsave(unsigned long *fpregs, unsigned long *fsr, |
34 | void *fpqueue, unsigned long *fpqdepth); | |
35 | extern void fpload(unsigned long *fpregs, unsigned long *fsr); | |
36 | ||
5526b7e4 | 37 | struct signal_frame { |
1da177e4 | 38 | struct sparc_stackf ss; |
4d7b92ad | 39 | __siginfo32_t info; |
1da177e4 LT |
40 | __siginfo_fpu_t __user *fpu_save; |
41 | unsigned long insns[2] __attribute__ ((aligned (8))); | |
42 | unsigned int extramask[_NSIG_WORDS - 1]; | |
43 | unsigned int extra_size; /* Should be 0 */ | |
5598473a DM |
44 | __siginfo_rwin_t __user *rwin_save; |
45 | } __attribute__((aligned(8))); | |
1da177e4 LT |
46 | |
47 | struct rt_signal_frame { | |
48 | struct sparc_stackf ss; | |
49 | siginfo_t info; | |
50 | struct pt_regs regs; | |
51 | sigset_t mask; | |
52 | __siginfo_fpu_t __user *fpu_save; | |
53 | unsigned int insns[2]; | |
54 | stack_t stack; | |
55 | unsigned int extra_size; /* Should be 0 */ | |
5598473a DM |
56 | __siginfo_rwin_t __user *rwin_save; |
57 | } __attribute__((aligned(8))); | |
1da177e4 LT |
58 | |
59 | /* Align macros */ | |
5526b7e4 | 60 | #define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7))) |
1da177e4 LT |
61 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) |
62 | ||
5526b7e4 | 63 | asmlinkage void do_sigreturn(struct pt_regs *regs) |
1da177e4 | 64 | { |
5526b7e4 | 65 | struct signal_frame __user *sf; |
1da177e4 LT |
66 | unsigned long up_psr, pc, npc; |
67 | sigset_t set; | |
68 | __siginfo_fpu_t __user *fpu_save; | |
5598473a | 69 | __siginfo_rwin_t __user *rwin_save; |
1da177e4 LT |
70 | int err; |
71 | ||
5526b7e4 | 72 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 73 | current->restart_block.fn = do_no_restart_syscall; |
5526b7e4 DM |
74 | |
75 | synchronize_user_stack(); | |
76 | ||
77 | sf = (struct signal_frame __user *) regs->u_regs[UREG_FP]; | |
1da177e4 LT |
78 | |
79 | /* 1. Make sure we are not getting garbage from the user */ | |
80 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf))) | |
81 | goto segv_and_exit; | |
82 | ||
83 | if (((unsigned long) sf) & 3) | |
84 | goto segv_and_exit; | |
85 | ||
86 | err = __get_user(pc, &sf->info.si_regs.pc); | |
87 | err |= __get_user(npc, &sf->info.si_regs.npc); | |
88 | ||
89 | if ((pc | npc) & 3) | |
90 | goto segv_and_exit; | |
91 | ||
92 | /* 2. Restore the state */ | |
93 | up_psr = regs->psr; | |
94 | err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs)); | |
95 | ||
96 | /* User can only change condition codes and FPU enabling in %psr. */ | |
97 | regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) | |
98 | | (regs->psr & (PSR_ICC | PSR_EF)); | |
99 | ||
28e61036 DM |
100 | /* Prevent syscall restart. */ |
101 | pt_regs_clear_syscall(regs); | |
102 | ||
1da177e4 | 103 | err |= __get_user(fpu_save, &sf->fpu_save); |
1da177e4 LT |
104 | if (fpu_save) |
105 | err |= restore_fpu_state(regs, fpu_save); | |
5598473a DM |
106 | err |= __get_user(rwin_save, &sf->rwin_save); |
107 | if (rwin_save) | |
108 | err |= restore_rwin_state(rwin_save); | |
1da177e4 LT |
109 | |
110 | /* This is pretty much atomic, no amount locking would prevent | |
111 | * the races which exist anyways. | |
112 | */ | |
113 | err |= __get_user(set.sig[0], &sf->info.si_mask); | |
114 | err |= __copy_from_user(&set.sig[1], &sf->extramask, | |
115 | (_NSIG_WORDS-1) * sizeof(unsigned int)); | |
116 | ||
117 | if (err) | |
118 | goto segv_and_exit; | |
119 | ||
faddf598 | 120 | set_current_blocked(&set); |
1da177e4 LT |
121 | return; |
122 | ||
123 | segv_and_exit: | |
124 | force_sig(SIGSEGV, current); | |
125 | } | |
126 | ||
1da177e4 LT |
127 | asmlinkage void do_rt_sigreturn(struct pt_regs *regs) |
128 | { | |
129 | struct rt_signal_frame __user *sf; | |
130 | unsigned int psr, pc, npc; | |
131 | __siginfo_fpu_t __user *fpu_save; | |
5598473a | 132 | __siginfo_rwin_t __user *rwin_save; |
1da177e4 | 133 | sigset_t set; |
1da177e4 LT |
134 | int err; |
135 | ||
136 | synchronize_user_stack(); | |
137 | sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP]; | |
138 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
139 | (((unsigned long) sf) & 0x03)) | |
140 | goto segv; | |
141 | ||
142 | err = __get_user(pc, &sf->regs.pc); | |
143 | err |= __get_user(npc, &sf->regs.npc); | |
144 | err |= ((pc | npc) & 0x03); | |
145 | ||
146 | err |= __get_user(regs->y, &sf->regs.y); | |
147 | err |= __get_user(psr, &sf->regs.psr); | |
148 | ||
149 | err |= __copy_from_user(®s->u_regs[UREG_G1], | |
150 | &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32)); | |
151 | ||
152 | regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); | |
153 | ||
28e61036 DM |
154 | /* Prevent syscall restart. */ |
155 | pt_regs_clear_syscall(regs); | |
156 | ||
1da177e4 | 157 | err |= __get_user(fpu_save, &sf->fpu_save); |
5598473a | 158 | if (!err && fpu_save) |
1da177e4 LT |
159 | err |= restore_fpu_state(regs, fpu_save); |
160 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
99b06feb | 161 | err |= restore_altstack(&sf->stack); |
1da177e4 LT |
162 | |
163 | if (err) | |
164 | goto segv; | |
165 | ||
166 | regs->pc = pc; | |
167 | regs->npc = npc; | |
168 | ||
5598473a DM |
169 | err |= __get_user(rwin_save, &sf->rwin_save); |
170 | if (!err && rwin_save) { | |
171 | if (restore_rwin_state(rwin_save)) | |
172 | goto segv; | |
173 | } | |
174 | ||
faddf598 | 175 | set_current_blocked(&set); |
1da177e4 LT |
176 | return; |
177 | segv: | |
178 | force_sig(SIGSEGV, current); | |
179 | } | |
180 | ||
181 | /* Checks if the fp is valid */ | |
182 | static inline int invalid_frame_pointer(void __user *fp, int fplen) | |
183 | { | |
3c23a766 | 184 | if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen)) |
1da177e4 | 185 | return 1; |
3c23a766 | 186 | |
1da177e4 LT |
187 | return 0; |
188 | } | |
189 | ||
08f73957 | 190 | static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
1da177e4 | 191 | { |
dc5dc7e6 | 192 | unsigned long sp = regs->u_regs[UREG_FP]; |
1da177e4 | 193 | |
dc5dc7e6 DM |
194 | /* |
195 | * If we are on the alternate signal stack and would overflow it, don't. | |
196 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
197 | */ | |
198 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) | |
199 | return (void __user *) -1L; | |
1da177e4 LT |
200 | |
201 | /* This is the X/Open sanctioned signal stack switching. */ | |
08f73957 | 202 | sp = sigsp(sp, ksig) - framesize; |
f036d9f3 | 203 | |
dc5dc7e6 DM |
204 | /* Always align the stack frame. This handles two cases. First, |
205 | * sigaltstack need not be mindful of platform specific stack | |
206 | * alignment. Second, if we took this signal because the stack | |
207 | * is not aligned properly, we'd like to take the signal cleanly | |
208 | * and report that. | |
209 | */ | |
f036d9f3 | 210 | sp &= ~15UL; |
dc5dc7e6 | 211 | |
f036d9f3 | 212 | return (void __user *) sp; |
1da177e4 LT |
213 | } |
214 | ||
08f73957 AV |
215 | static int setup_frame(struct ksignal *ksig, struct pt_regs *regs, |
216 | sigset_t *oldset) | |
1da177e4 | 217 | { |
5526b7e4 | 218 | struct signal_frame __user *sf; |
5598473a DM |
219 | int sigframe_size, err, wsaved; |
220 | void __user *tail; | |
1da177e4 LT |
221 | |
222 | /* 1. Make sure everything is clean */ | |
223 | synchronize_user_stack(); | |
224 | ||
5598473a DM |
225 | wsaved = current_thread_info()->w_saved; |
226 | ||
227 | sigframe_size = sizeof(*sf); | |
228 | if (used_math()) | |
229 | sigframe_size += sizeof(__siginfo_fpu_t); | |
230 | if (wsaved) | |
231 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 | 232 | |
5526b7e4 | 233 | sf = (struct signal_frame __user *) |
08f73957 | 234 | get_sigframe(ksig, regs, sigframe_size); |
1da177e4 | 235 | |
08f73957 AV |
236 | if (invalid_frame_pointer(sf, sigframe_size)) { |
237 | do_exit(SIGILL); | |
238 | return -EINVAL; | |
239 | } | |
1da177e4 | 240 | |
5598473a | 241 | tail = sf + 1; |
1da177e4 LT |
242 | |
243 | /* 2. Save the current process state */ | |
244 | err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs)); | |
245 | ||
246 | err |= __put_user(0, &sf->extra_size); | |
247 | ||
248 | if (used_math()) { | |
5598473a DM |
249 | __siginfo_fpu_t __user *fp = tail; |
250 | tail += sizeof(*fp); | |
251 | err |= save_fpu_state(regs, fp); | |
252 | err |= __put_user(fp, &sf->fpu_save); | |
1da177e4 LT |
253 | } else { |
254 | err |= __put_user(0, &sf->fpu_save); | |
255 | } | |
5598473a DM |
256 | if (wsaved) { |
257 | __siginfo_rwin_t __user *rwp = tail; | |
258 | tail += sizeof(*rwp); | |
259 | err |= save_rwin_state(wsaved, rwp); | |
260 | err |= __put_user(rwp, &sf->rwin_save); | |
261 | } else { | |
262 | err |= __put_user(0, &sf->rwin_save); | |
263 | } | |
1da177e4 LT |
264 | |
265 | err |= __put_user(oldset->sig[0], &sf->info.si_mask); | |
266 | err |= __copy_to_user(sf->extramask, &oldset->sig[1], | |
267 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
5598473a DM |
268 | if (!wsaved) { |
269 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], | |
270 | sizeof(struct reg_window32)); | |
271 | } else { | |
272 | struct reg_window32 *rp; | |
273 | ||
274 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
275 | err |= __copy_to_user(sf, rp, sizeof(struct reg_window32)); | |
276 | } | |
1da177e4 | 277 | if (err) |
08f73957 | 278 | return err; |
1da177e4 LT |
279 | |
280 | /* 3. signal handler back-trampoline and parameters */ | |
281 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 282 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
283 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
284 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
285 | ||
286 | /* 4. signal handler */ | |
08f73957 | 287 | regs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
288 | regs->npc = (regs->pc + 4); |
289 | ||
290 | /* 5. return to kernel instructions */ | |
08f73957 AV |
291 | if (ksig->ka.ka_restorer) |
292 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 LT |
293 | else { |
294 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); | |
295 | ||
296 | /* mov __NR_sigreturn, %g1 */ | |
297 | err |= __put_user(0x821020d8, &sf->insns[0]); | |
298 | ||
299 | /* t 0x10 */ | |
300 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
301 | if (err) | |
08f73957 | 302 | return err; |
1da177e4 LT |
303 | |
304 | /* Flush instruction space. */ | |
305 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); | |
306 | } | |
392c2180 | 307 | return 0; |
1da177e4 LT |
308 | } |
309 | ||
08f73957 AV |
310 | static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs, |
311 | sigset_t *oldset) | |
1da177e4 LT |
312 | { |
313 | struct rt_signal_frame __user *sf; | |
5598473a DM |
314 | int sigframe_size, wsaved; |
315 | void __user *tail; | |
1da177e4 LT |
316 | unsigned int psr; |
317 | int err; | |
318 | ||
319 | synchronize_user_stack(); | |
5598473a DM |
320 | wsaved = current_thread_info()->w_saved; |
321 | sigframe_size = sizeof(*sf); | |
322 | if (used_math()) | |
323 | sigframe_size += sizeof(__siginfo_fpu_t); | |
324 | if (wsaved) | |
325 | sigframe_size += sizeof(__siginfo_rwin_t); | |
1da177e4 | 326 | sf = (struct rt_signal_frame __user *) |
08f73957 AV |
327 | get_sigframe(ksig, regs, sigframe_size); |
328 | if (invalid_frame_pointer(sf, sigframe_size)) { | |
329 | do_exit(SIGILL); | |
330 | return -EINVAL; | |
331 | } | |
1da177e4 | 332 | |
5598473a | 333 | tail = sf + 1; |
1da177e4 LT |
334 | err = __put_user(regs->pc, &sf->regs.pc); |
335 | err |= __put_user(regs->npc, &sf->regs.npc); | |
336 | err |= __put_user(regs->y, &sf->regs.y); | |
337 | psr = regs->psr; | |
338 | if (used_math()) | |
339 | psr |= PSR_EF; | |
340 | err |= __put_user(psr, &sf->regs.psr); | |
341 | err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); | |
342 | err |= __put_user(0, &sf->extra_size); | |
343 | ||
344 | if (psr & PSR_EF) { | |
529b17a9 | 345 | __siginfo_fpu_t __user *fp = tail; |
5598473a DM |
346 | tail += sizeof(*fp); |
347 | err |= save_fpu_state(regs, fp); | |
348 | err |= __put_user(fp, &sf->fpu_save); | |
1da177e4 LT |
349 | } else { |
350 | err |= __put_user(0, &sf->fpu_save); | |
351 | } | |
5598473a | 352 | if (wsaved) { |
529b17a9 | 353 | __siginfo_rwin_t __user *rwp = tail; |
5598473a DM |
354 | tail += sizeof(*rwp); |
355 | err |= save_rwin_state(wsaved, rwp); | |
356 | err |= __put_user(rwp, &sf->rwin_save); | |
357 | } else { | |
358 | err |= __put_user(0, &sf->rwin_save); | |
359 | } | |
1da177e4 LT |
360 | err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); |
361 | ||
362 | /* Setup sigaltstack */ | |
99b06feb | 363 | err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
1da177e4 | 364 | |
5598473a DM |
365 | if (!wsaved) { |
366 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], | |
367 | sizeof(struct reg_window32)); | |
368 | } else { | |
369 | struct reg_window32 *rp; | |
370 | ||
371 | rp = ¤t_thread_info()->reg_window[wsaved - 1]; | |
372 | err |= __copy_to_user(sf, rp, sizeof(struct reg_window32)); | |
373 | } | |
1da177e4 | 374 | |
08f73957 | 375 | err |= copy_siginfo_to_user(&sf->info, &ksig->info); |
1da177e4 LT |
376 | |
377 | if (err) | |
08f73957 | 378 | return err; |
1da177e4 LT |
379 | |
380 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
08f73957 | 381 | regs->u_regs[UREG_I0] = ksig->sig; |
1da177e4 LT |
382 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
383 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
384 | ||
08f73957 | 385 | regs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 LT |
386 | regs->npc = (regs->pc + 4); |
387 | ||
08f73957 AV |
388 | if (ksig->ka.ka_restorer) |
389 | regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; | |
1da177e4 LT |
390 | else { |
391 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); | |
392 | ||
393 | /* mov __NR_sigreturn, %g1 */ | |
394 | err |= __put_user(0x821020d8, &sf->insns[0]); | |
395 | ||
396 | /* t 0x10 */ | |
397 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
398 | if (err) | |
08f73957 | 399 | return err; |
1da177e4 LT |
400 | |
401 | /* Flush instruction space. */ | |
402 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); | |
403 | } | |
392c2180 | 404 | return 0; |
1da177e4 LT |
405 | } |
406 | ||
a610d6e6 | 407 | static inline void |
08f73957 | 408 | handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
1da177e4 | 409 | { |
b7f9a11a | 410 | sigset_t *oldset = sigmask_to_save(); |
392c2180 DM |
411 | int err; |
412 | ||
08f73957 AV |
413 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
414 | err = setup_rt_frame(ksig, regs, oldset); | |
ec98c6b9 | 415 | else |
08f73957 AV |
416 | err = setup_frame(ksig, regs, oldset); |
417 | signal_setup_done(err, ksig, 0); | |
1da177e4 LT |
418 | } |
419 | ||
420 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
421 | struct sigaction *sa) | |
422 | { | |
423 | switch(regs->u_regs[UREG_I0]) { | |
424 | case ERESTART_RESTARTBLOCK: | |
425 | case ERESTARTNOHAND: | |
426 | no_system_call_restart: | |
427 | regs->u_regs[UREG_I0] = EINTR; | |
428 | regs->psr |= PSR_C; | |
429 | break; | |
430 | case ERESTARTSYS: | |
431 | if (!(sa->sa_flags & SA_RESTART)) | |
432 | goto no_system_call_restart; | |
433 | /* fallthrough */ | |
434 | case ERESTARTNOINTR: | |
435 | regs->u_regs[UREG_I0] = orig_i0; | |
436 | regs->pc -= 4; | |
437 | regs->npc -= 4; | |
438 | } | |
439 | } | |
440 | ||
441 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
442 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
443 | * mistake. | |
444 | */ | |
5a157d5b | 445 | static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
1da177e4 | 446 | { |
08f73957 | 447 | struct ksignal ksig; |
28e61036 | 448 | int restart_syscall; |
08f73957 | 449 | bool has_handler; |
1da177e4 | 450 | |
1d299bc7 DM |
451 | /* It's a lot of work and synchronization to add a new ptrace |
452 | * register for GDB to save and restore in order to get | |
453 | * orig_i0 correct for syscall restarts when debugging. | |
454 | * | |
e88d2468 DM |
455 | * Although it should be the case that most of the global |
456 | * registers are volatile across a system call, glibc already | |
457 | * depends upon that fact that we preserve them. So we can't | |
458 | * just use any global register to save away the orig_i0 value. | |
459 | * | |
460 | * In particular %g2, %g3, %g4, and %g5 are all assumed to be | |
461 | * preserved across a system call trap by various pieces of | |
462 | * code in glibc. | |
463 | * | |
464 | * %g7 is used as the "thread register". %g6 is not used in | |
465 | * any fixed manner. %g6 is used as a scratch register and | |
466 | * a compiler temporary, but it's value is never used across | |
467 | * a system call. Therefore %g6 is usable for orig_i0 storage. | |
1d299bc7 | 468 | */ |
28e61036 | 469 | if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) |
e88d2468 | 470 | regs->u_regs[UREG_G6] = orig_i0; |
1da177e4 | 471 | |
08f73957 | 472 | has_handler = get_signal(&ksig); |
28e61036 DM |
473 | |
474 | /* If the debugger messes with the program counter, it clears | |
475 | * the software "in syscall" bit, directing us to not perform | |
476 | * a syscall restart. | |
477 | */ | |
1d299bc7 DM |
478 | restart_syscall = 0; |
479 | if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) { | |
480 | restart_syscall = 1; | |
e88d2468 | 481 | orig_i0 = regs->u_regs[UREG_G6]; |
1d299bc7 DM |
482 | } |
483 | ||
08f73957 | 484 | if (has_handler) { |
28e61036 | 485 | if (restart_syscall) |
08f73957 AV |
486 | syscall_restart(orig_i0, regs, &ksig.ka.sa); |
487 | handle_signal(&ksig, regs); | |
488 | } else { | |
489 | if (restart_syscall) { | |
490 | switch (regs->u_regs[UREG_I0]) { | |
491 | case ERESTARTNOHAND: | |
492 | case ERESTARTSYS: | |
493 | case ERESTARTNOINTR: | |
494 | /* replay the system call when we are done */ | |
495 | regs->u_regs[UREG_I0] = orig_i0; | |
496 | regs->pc -= 4; | |
497 | regs->npc -= 4; | |
498 | pt_regs_clear_syscall(regs); | |
499 | case ERESTART_RESTARTBLOCK: | |
500 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
501 | regs->pc -= 4; | |
502 | regs->npc -= 4; | |
503 | pt_regs_clear_syscall(regs); | |
504 | } | |
505 | } | |
506 | restore_saved_sigmask(); | |
1da177e4 | 507 | } |
1da177e4 LT |
508 | } |
509 | ||
5a157d5b DM |
510 | void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, |
511 | unsigned long thread_info_flags) | |
512 | { | |
6fd84c08 | 513 | if (thread_info_flags & _TIF_SIGPENDING) |
5a157d5b DM |
514 | do_signal(regs, orig_i0); |
515 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
516 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
517 | tracehook_notify_resume(regs); | |
518 | } | |
519 | } | |
520 | ||
529b17a9 SR |
521 | asmlinkage int do_sys_sigstack(struct sigstack __user *ssptr, |
522 | struct sigstack __user *ossptr, | |
523 | unsigned long sp) | |
1da177e4 LT |
524 | { |
525 | int ret = -EFAULT; | |
526 | ||
527 | /* First see if old state is wanted. */ | |
528 | if (ossptr) { | |
529 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
530 | &ossptr->the_stack) || | |
531 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
532 | goto out; | |
533 | } | |
534 | ||
535 | /* Now see if we want to update the new state. */ | |
536 | if (ssptr) { | |
537 | char *ss_sp; | |
538 | ||
539 | if (get_user(ss_sp, &ssptr->the_stack)) | |
540 | goto out; | |
541 | /* If the current stack was set with sigaltstack, don't | |
542 | swap stacks while we are on it. */ | |
543 | ret = -EPERM; | |
544 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
545 | goto out; | |
546 | ||
547 | /* Since we don't know the extent of the stack, and we don't | |
548 | track onstack-ness, but rather calculate it, we must | |
549 | presume a size. Ho hum this interface is lossy. */ | |
550 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
551 | current->sas_ss_size = SIGSTKSZ; | |
552 | } | |
553 | ret = 0; | |
554 | out: | |
555 | return ret; | |
556 | } |