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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
9 | */ | |
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
13 | #include <linux/smp_lock.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/signal.h> | |
16 | #include <linux/syscalls.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/wait.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/compat.h> | |
21 | #include <linux/suspend.h> | |
22 | #include <linux/compiler.h> | |
23 | ||
24 | #include <asm/asm.h> | |
25 | #include <linux/bitops.h> | |
26 | #include <asm/cacheflush.h> | |
27 | #include <asm/sim.h> | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/ucontext.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/fpu.h> | |
32 | ||
33 | #define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3) | |
34 | ||
35 | typedef struct compat_siginfo { | |
36 | int si_signo; | |
37 | int si_code; | |
38 | int si_errno; | |
39 | ||
40 | union { | |
41 | int _pad[SI_PAD_SIZE32]; | |
42 | ||
43 | /* kill() */ | |
44 | struct { | |
45 | compat_pid_t _pid; /* sender's pid */ | |
46 | compat_uid_t _uid; /* sender's uid */ | |
47 | } _kill; | |
48 | ||
49 | /* SIGCHLD */ | |
50 | struct { | |
51 | compat_pid_t _pid; /* which child */ | |
52 | compat_uid_t _uid; /* sender's uid */ | |
53 | int _status; /* exit code */ | |
54 | compat_clock_t _utime; | |
55 | compat_clock_t _stime; | |
56 | } _sigchld; | |
57 | ||
58 | /* IRIX SIGCHLD */ | |
59 | struct { | |
60 | compat_pid_t _pid; /* which child */ | |
61 | compat_clock_t _utime; | |
62 | int _status; /* exit code */ | |
63 | compat_clock_t _stime; | |
64 | } _irix_sigchld; | |
65 | ||
66 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ | |
67 | struct { | |
68 | s32 _addr; /* faulting insn/memory ref. */ | |
69 | } _sigfault; | |
70 | ||
71 | /* SIGPOLL, SIGXFSZ (To do ...) */ | |
72 | struct { | |
73 | int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ | |
74 | int _fd; | |
75 | } _sigpoll; | |
76 | ||
77 | /* POSIX.1b timers */ | |
78 | struct { | |
79 | unsigned int _timer1; | |
80 | unsigned int _timer2; | |
81 | } _timer; | |
82 | ||
83 | /* POSIX.1b signals */ | |
84 | struct { | |
85 | compat_pid_t _pid; /* sender's pid */ | |
86 | compat_uid_t _uid; /* sender's uid */ | |
87 | compat_sigval_t _sigval; | |
88 | } _rt; | |
89 | ||
90 | } _sifields; | |
91 | } compat_siginfo_t; | |
92 | ||
93 | /* | |
94 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
95 | */ | |
96 | #define __NR_O32_sigreturn 4119 | |
97 | #define __NR_O32_rt_sigreturn 4193 | |
98 | #define __NR_O32_restart_syscall 4253 | |
99 | ||
100 | #define DEBUG_SIG 0 | |
101 | ||
102 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
103 | ||
104 | extern int do_signal32(sigset_t *oldset, struct pt_regs *regs); | |
105 | ||
106 | /* 32-bit compatibility types */ | |
107 | ||
108 | #define _NSIG_BPW32 32 | |
109 | #define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32) | |
110 | ||
111 | typedef struct { | |
112 | unsigned int sig[_NSIG_WORDS32]; | |
113 | } sigset_t32; | |
114 | ||
115 | typedef unsigned int __sighandler32_t; | |
116 | typedef void (*vfptr_t)(void); | |
117 | ||
118 | struct sigaction32 { | |
119 | unsigned int sa_flags; | |
120 | __sighandler32_t sa_handler; | |
121 | compat_sigset_t sa_mask; | |
122 | }; | |
123 | ||
124 | /* IRIX compatible stack_t */ | |
125 | typedef struct sigaltstack32 { | |
126 | s32 ss_sp; | |
127 | compat_size_t ss_size; | |
128 | int ss_flags; | |
129 | } stack32_t; | |
130 | ||
131 | struct ucontext32 { | |
132 | u32 uc_flags; | |
133 | s32 uc_link; | |
134 | stack32_t uc_stack; | |
135 | struct sigcontext32 uc_mcontext; | |
136 | sigset_t32 uc_sigmask; /* mask last for extensibility */ | |
137 | }; | |
138 | ||
139 | extern void __put_sigset_unknown_nsig(void); | |
140 | extern void __get_sigset_unknown_nsig(void); | |
141 | ||
142 | static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t *ubuf) | |
143 | { | |
144 | int err = 0; | |
145 | ||
146 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) | |
147 | return -EFAULT; | |
148 | ||
149 | switch (_NSIG_WORDS) { | |
150 | default: | |
151 | __put_sigset_unknown_nsig(); | |
152 | case 2: | |
153 | err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]); | |
154 | err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); | |
155 | case 1: | |
156 | err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]); | |
157 | err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); | |
158 | } | |
159 | ||
160 | return err; | |
161 | } | |
162 | ||
163 | static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf) | |
164 | { | |
165 | int err = 0; | |
166 | unsigned long sig[4]; | |
167 | ||
168 | if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) | |
169 | return -EFAULT; | |
170 | ||
171 | switch (_NSIG_WORDS) { | |
172 | default: | |
173 | __get_sigset_unknown_nsig(); | |
174 | case 2: | |
175 | err |= __get_user (sig[3], &ubuf->sig[3]); | |
176 | err |= __get_user (sig[2], &ubuf->sig[2]); | |
177 | kbuf->sig[1] = sig[2] | (sig[3] << 32); | |
178 | case 1: | |
179 | err |= __get_user (sig[1], &ubuf->sig[1]); | |
180 | err |= __get_user (sig[0], &ubuf->sig[0]); | |
181 | kbuf->sig[0] = sig[0] | (sig[1] << 32); | |
182 | } | |
183 | ||
184 | return err; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Atomically swap in the new signal mask, and wait for a signal. | |
189 | */ | |
190 | ||
191 | save_static_function(sys32_sigsuspend); | |
192 | __attribute_used__ noinline static int | |
193 | _sys32_sigsuspend(nabi_no_regargs struct pt_regs regs) | |
194 | { | |
195 | compat_sigset_t *uset; | |
196 | sigset_t newset, saveset; | |
197 | ||
198 | uset = (compat_sigset_t *) regs.regs[4]; | |
199 | if (get_sigset(&newset, uset)) | |
200 | return -EFAULT; | |
201 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
202 | ||
203 | spin_lock_irq(¤t->sighand->siglock); | |
204 | saveset = current->blocked; | |
205 | current->blocked = newset; | |
206 | recalc_sigpending(); | |
207 | spin_unlock_irq(¤t->sighand->siglock); | |
208 | ||
209 | regs.regs[2] = EINTR; | |
210 | regs.regs[7] = 1; | |
211 | while (1) { | |
212 | current->state = TASK_INTERRUPTIBLE; | |
213 | schedule(); | |
214 | if (do_signal32(&saveset, ®s)) | |
215 | return -EINTR; | |
216 | } | |
217 | } | |
218 | ||
219 | save_static_function(sys32_rt_sigsuspend); | |
220 | __attribute_used__ noinline static int | |
221 | _sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) | |
222 | { | |
223 | compat_sigset_t *uset; | |
224 | sigset_t newset, saveset; | |
225 | size_t sigsetsize; | |
226 | ||
227 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
228 | sigsetsize = regs.regs[5]; | |
229 | if (sigsetsize != sizeof(compat_sigset_t)) | |
230 | return -EINVAL; | |
231 | ||
232 | uset = (compat_sigset_t *) regs.regs[4]; | |
233 | if (get_sigset(&newset, uset)) | |
234 | return -EFAULT; | |
235 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
236 | ||
237 | spin_lock_irq(¤t->sighand->siglock); | |
238 | saveset = current->blocked; | |
239 | current->blocked = newset; | |
240 | recalc_sigpending(); | |
241 | spin_unlock_irq(¤t->sighand->siglock); | |
242 | ||
243 | regs.regs[2] = EINTR; | |
244 | regs.regs[7] = 1; | |
245 | while (1) { | |
246 | current->state = TASK_INTERRUPTIBLE; | |
247 | schedule(); | |
248 | if (do_signal32(&saveset, ®s)) | |
249 | return -EINTR; | |
250 | } | |
251 | } | |
252 | ||
253 | asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act, | |
254 | struct sigaction32 *oact) | |
255 | { | |
256 | struct k_sigaction new_ka, old_ka; | |
257 | int ret; | |
258 | int err = 0; | |
259 | ||
260 | if (act) { | |
261 | old_sigset_t mask; | |
262 | ||
263 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
264 | return -EFAULT; | |
265 | err |= __get_user((u32)(u64)new_ka.sa.sa_handler, | |
266 | &act->sa_handler); | |
267 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
268 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
269 | if (err) | |
270 | return -EFAULT; | |
271 | ||
272 | siginitset(&new_ka.sa.sa_mask, mask); | |
273 | } | |
274 | ||
275 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
276 | ||
277 | if (!ret && oact) { | |
278 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
279 | return -EFAULT; | |
280 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
281 | err |= __put_user((u32)(u64)old_ka.sa.sa_handler, | |
282 | &oact->sa_handler); | |
283 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
284 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
285 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
286 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
287 | if (err) | |
288 | return -EFAULT; | |
289 | } | |
290 | ||
291 | return ret; | |
292 | } | |
293 | ||
294 | asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
295 | { | |
296 | const stack32_t *uss = (const stack32_t *) regs.regs[4]; | |
297 | stack32_t *uoss = (stack32_t *) regs.regs[5]; | |
298 | unsigned long usp = regs.regs[29]; | |
299 | stack_t kss, koss; | |
300 | int ret, err = 0; | |
301 | mm_segment_t old_fs = get_fs(); | |
302 | s32 sp; | |
303 | ||
304 | if (uss) { | |
305 | if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) | |
306 | return -EFAULT; | |
307 | err |= __get_user(sp, &uss->ss_sp); | |
308 | kss.ss_sp = (void *) (long) sp; | |
309 | err |= __get_user(kss.ss_size, &uss->ss_size); | |
310 | err |= __get_user(kss.ss_flags, &uss->ss_flags); | |
311 | if (err) | |
312 | return -EFAULT; | |
313 | } | |
314 | ||
315 | set_fs (KERNEL_DS); | |
316 | ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, usp); | |
317 | set_fs (old_fs); | |
318 | ||
319 | if (!ret && uoss) { | |
320 | if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) | |
321 | return -EFAULT; | |
322 | sp = (int) (long) koss.ss_sp; | |
323 | err |= __put_user(sp, &uoss->ss_sp); | |
324 | err |= __put_user(koss.ss_size, &uoss->ss_size); | |
325 | err |= __put_user(koss.ss_flags, &uoss->ss_flags); | |
326 | if (err) | |
327 | return -EFAULT; | |
328 | } | |
329 | return ret; | |
330 | } | |
331 | ||
332 | static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc) | |
333 | { | |
334 | int err = 0; | |
335 | __u32 used_math; | |
336 | ||
337 | /* Always make any pending restarted system calls return -EINTR */ | |
338 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
339 | ||
340 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
341 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
342 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
343 | ||
344 | #define restore_gp_reg(i) do { \ | |
345 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ | |
346 | } while(0) | |
347 | restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); | |
348 | restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); | |
349 | restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); | |
350 | restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); | |
351 | restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); | |
352 | restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); | |
353 | restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); | |
354 | restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); | |
355 | restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); | |
356 | restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); | |
357 | restore_gp_reg(31); | |
358 | #undef restore_gp_reg | |
359 | ||
360 | err |= __get_user(used_math, &sc->sc_used_math); | |
361 | conditional_used_math(used_math); | |
362 | ||
363 | preempt_disable(); | |
364 | ||
365 | if (used_math()) { | |
366 | /* restore fpu context if we have used it before */ | |
367 | own_fpu(); | |
368 | err |= restore_fp_context32(sc); | |
369 | } else { | |
370 | /* signal handler may have used FPU. Give it up. */ | |
371 | lose_fpu(); | |
372 | } | |
373 | ||
374 | preempt_enable(); | |
375 | ||
376 | return err; | |
377 | } | |
378 | ||
379 | struct sigframe { | |
380 | u32 sf_ass[4]; /* argument save space for o32 */ | |
381 | u32 sf_code[2]; /* signal trampoline */ | |
382 | struct sigcontext32 sf_sc; | |
383 | sigset_t sf_mask; | |
384 | }; | |
385 | ||
386 | struct rt_sigframe32 { | |
387 | u32 rs_ass[4]; /* argument save space for o32 */ | |
388 | u32 rs_code[2]; /* signal trampoline */ | |
389 | compat_siginfo_t rs_info; | |
390 | struct ucontext32 rs_uc; | |
391 | }; | |
392 | ||
393 | int copy_siginfo_to_user32(compat_siginfo_t *to, siginfo_t *from) | |
394 | { | |
395 | int err; | |
396 | ||
397 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
398 | return -EFAULT; | |
399 | ||
400 | /* If you change siginfo_t structure, please be sure | |
401 | this code is fixed accordingly. | |
402 | It should never copy any pad contained in the structure | |
403 | to avoid security leaks, but must copy the generic | |
404 | 3 ints plus the relevant union member. | |
405 | This routine must convert siginfo from 64bit to 32bit as well | |
406 | at the same time. */ | |
407 | err = __put_user(from->si_signo, &to->si_signo); | |
408 | err |= __put_user(from->si_errno, &to->si_errno); | |
409 | err |= __put_user((short)from->si_code, &to->si_code); | |
410 | if (from->si_code < 0) | |
411 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
412 | else { | |
413 | switch (from->si_code >> 16) { | |
414 | case __SI_CHLD >> 16: | |
415 | err |= __put_user(from->si_utime, &to->si_utime); | |
416 | err |= __put_user(from->si_stime, &to->si_stime); | |
417 | err |= __put_user(from->si_status, &to->si_status); | |
418 | default: | |
419 | err |= __put_user(from->si_pid, &to->si_pid); | |
420 | err |= __put_user(from->si_uid, &to->si_uid); | |
421 | break; | |
422 | case __SI_FAULT >> 16: | |
423 | err |= __put_user((long)from->si_addr, &to->si_addr); | |
424 | break; | |
425 | case __SI_POLL >> 16: | |
426 | err |= __put_user(from->si_band, &to->si_band); | |
427 | err |= __put_user(from->si_fd, &to->si_fd); | |
428 | break; | |
429 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
430 | case __SI_MESGQ >> 16: | |
431 | err |= __put_user(from->si_pid, &to->si_pid); | |
432 | err |= __put_user(from->si_uid, &to->si_uid); | |
433 | err |= __put_user(from->si_int, &to->si_int); | |
434 | break; | |
435 | } | |
436 | } | |
437 | return err; | |
438 | } | |
439 | ||
440 | save_static_function(sys32_sigreturn); | |
441 | __attribute_used__ noinline static void | |
442 | _sys32_sigreturn(nabi_no_regargs struct pt_regs regs) | |
443 | { | |
444 | struct sigframe *frame; | |
445 | sigset_t blocked; | |
446 | ||
447 | frame = (struct sigframe *) regs.regs[29]; | |
448 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
449 | goto badframe; | |
450 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
451 | goto badframe; | |
452 | ||
453 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
454 | spin_lock_irq(¤t->sighand->siglock); | |
455 | current->blocked = blocked; | |
456 | recalc_sigpending(); | |
457 | spin_unlock_irq(¤t->sighand->siglock); | |
458 | ||
459 | if (restore_sigcontext32(®s, &frame->sf_sc)) | |
460 | goto badframe; | |
461 | ||
462 | /* | |
463 | * Don't let your children do this ... | |
464 | */ | |
465 | if (current_thread_info()->flags & TIF_SYSCALL_TRACE) | |
466 | do_syscall_trace(®s, 1); | |
467 | __asm__ __volatile__( | |
468 | "move\t$29, %0\n\t" | |
469 | "j\tsyscall_exit" | |
470 | :/* no outputs */ | |
471 | :"r" (®s)); | |
472 | /* Unreached */ | |
473 | ||
474 | badframe: | |
475 | force_sig(SIGSEGV, current); | |
476 | } | |
477 | ||
478 | save_static_function(sys32_rt_sigreturn); | |
479 | __attribute_used__ noinline static void | |
480 | _sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) | |
481 | { | |
482 | struct rt_sigframe32 *frame; | |
483 | sigset_t set; | |
484 | stack_t st; | |
485 | s32 sp; | |
486 | ||
487 | frame = (struct rt_sigframe32 *) regs.regs[29]; | |
488 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
489 | goto badframe; | |
490 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
491 | goto badframe; | |
492 | ||
493 | sigdelsetmask(&set, ~_BLOCKABLE); | |
494 | spin_lock_irq(¤t->sighand->siglock); | |
495 | current->blocked = set; | |
496 | recalc_sigpending(); | |
497 | spin_unlock_irq(¤t->sighand->siglock); | |
498 | ||
499 | if (restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext)) | |
500 | goto badframe; | |
501 | ||
502 | /* The ucontext contains a stack32_t, so we must convert! */ | |
503 | if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) | |
504 | goto badframe; | |
505 | st.ss_size = (long) sp; | |
506 | if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) | |
507 | goto badframe; | |
508 | if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) | |
509 | goto badframe; | |
510 | ||
511 | /* It is more difficult to avoid calling this function than to | |
512 | call it and ignore errors. */ | |
513 | do_sigaltstack(&st, NULL, regs.regs[29]); | |
514 | ||
515 | /* | |
516 | * Don't let your children do this ... | |
517 | */ | |
518 | __asm__ __volatile__( | |
519 | "move\t$29, %0\n\t" | |
520 | "j\tsyscall_exit" | |
521 | :/* no outputs */ | |
522 | :"r" (®s)); | |
523 | /* Unreached */ | |
524 | ||
525 | badframe: | |
526 | force_sig(SIGSEGV, current); | |
527 | } | |
528 | ||
529 | static inline int setup_sigcontext32(struct pt_regs *regs, | |
530 | struct sigcontext32 *sc) | |
531 | { | |
532 | int err = 0; | |
533 | ||
534 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
535 | err |= __put_user(regs->cp0_status, &sc->sc_status); | |
536 | ||
537 | #define save_gp_reg(i) { \ | |
538 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ | |
539 | } while(0) | |
540 | __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); | |
541 | save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); | |
542 | save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); | |
543 | save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); | |
544 | save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); | |
545 | save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); | |
546 | save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); | |
547 | save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); | |
548 | save_gp_reg(31); | |
549 | #undef save_gp_reg | |
550 | ||
551 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
552 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
553 | err |= __put_user(regs->cp0_cause, &sc->sc_cause); | |
554 | err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr); | |
555 | ||
556 | err |= __put_user(!!used_math(), &sc->sc_used_math); | |
557 | ||
558 | if (!used_math()) | |
559 | goto out; | |
560 | ||
561 | /* | |
562 | * Save FPU state to signal context. Signal handler will "inherit" | |
563 | * current FPU state. | |
564 | */ | |
565 | preempt_disable(); | |
566 | ||
567 | if (!is_fpu_owner()) { | |
568 | own_fpu(); | |
569 | restore_fp(current); | |
570 | } | |
571 | err |= save_fp_context32(sc); | |
572 | ||
573 | preempt_enable(); | |
574 | ||
575 | out: | |
576 | return err; | |
577 | } | |
578 | ||
579 | /* | |
580 | * Determine which stack to use.. | |
581 | */ | |
582 | static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
583 | size_t frame_size) | |
584 | { | |
585 | unsigned long sp; | |
586 | ||
587 | /* Default to using normal stack */ | |
588 | sp = regs->regs[29]; | |
589 | ||
590 | /* | |
591 | * FPU emulator may have it's own trampoline active just | |
592 | * above the user stack, 16-bytes before the next lowest | |
593 | * 16 byte boundary. Try to avoid trashing it. | |
594 | */ | |
595 | sp -= 32; | |
596 | ||
597 | /* This is the X/Open sanctioned signal stack switching. */ | |
598 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
599 | sp = current->sas_ss_sp + current->sas_ss_size; | |
600 | ||
601 | return (void *)((sp - frame_size) & ALMASK); | |
602 | } | |
603 | ||
604 | static inline void setup_frame(struct k_sigaction * ka, struct pt_regs *regs, | |
605 | int signr, sigset_t *set) | |
606 | { | |
607 | struct sigframe *frame; | |
608 | int err = 0; | |
609 | ||
610 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
611 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
612 | goto give_sigsegv; | |
613 | ||
614 | /* | |
615 | * Set up the return code ... | |
616 | * | |
617 | * li v0, __NR_O32_sigreturn | |
618 | * syscall | |
619 | */ | |
620 | err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0); | |
621 | err |= __put_user(0x0000000c , frame->sf_code + 1); | |
622 | flush_cache_sigtramp((unsigned long) frame->sf_code); | |
623 | ||
624 | err |= setup_sigcontext32(regs, &frame->sf_sc); | |
625 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
626 | if (err) | |
627 | goto give_sigsegv; | |
628 | ||
629 | /* | |
630 | * Arguments to signal handler: | |
631 | * | |
632 | * a0 = signal number | |
633 | * a1 = 0 (should be cause) | |
634 | * a2 = pointer to struct sigcontext | |
635 | * | |
636 | * $25 and c0_epc point to the signal handler, $29 points to the | |
637 | * struct sigframe. | |
638 | */ | |
639 | regs->regs[ 4] = signr; | |
640 | regs->regs[ 5] = 0; | |
641 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
642 | regs->regs[29] = (unsigned long) frame; | |
643 | regs->regs[31] = (unsigned long) frame->sf_code; | |
644 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
645 | ||
646 | #if DEBUG_SIG | |
647 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
648 | current->comm, current->pid, | |
649 | frame, regs->cp0_epc, frame->sf_code); | |
650 | #endif | |
651 | return; | |
652 | ||
653 | give_sigsegv: | |
654 | force_sigsegv(signr, current); | |
655 | } | |
656 | ||
657 | static inline void setup_rt_frame(struct k_sigaction * ka, | |
658 | struct pt_regs *regs, int signr, | |
659 | sigset_t *set, siginfo_t *info) | |
660 | { | |
661 | struct rt_sigframe32 *frame; | |
662 | int err = 0; | |
663 | s32 sp; | |
664 | ||
665 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
666 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
667 | goto give_sigsegv; | |
668 | ||
669 | /* Set up to return from userspace. If provided, use a stub already | |
670 | in userspace. */ | |
671 | /* | |
672 | * Set up the return code ... | |
673 | * | |
674 | * li v0, __NR_O32_rt_sigreturn | |
675 | * syscall | |
676 | */ | |
677 | err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0); | |
678 | err |= __put_user(0x0000000c , frame->rs_code + 1); | |
679 | flush_cache_sigtramp((unsigned long) frame->rs_code); | |
680 | ||
681 | /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ | |
682 | err |= copy_siginfo_to_user32(&frame->rs_info, info); | |
683 | ||
684 | /* Create the ucontext. */ | |
685 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
686 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
687 | sp = (int) (long) current->sas_ss_sp; | |
688 | err |= __put_user(sp, | |
689 | &frame->rs_uc.uc_stack.ss_sp); | |
690 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
691 | &frame->rs_uc.uc_stack.ss_flags); | |
692 | err |= __put_user(current->sas_ss_size, | |
693 | &frame->rs_uc.uc_stack.ss_size); | |
694 | err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); | |
695 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
696 | ||
697 | if (err) | |
698 | goto give_sigsegv; | |
699 | ||
700 | /* | |
701 | * Arguments to signal handler: | |
702 | * | |
703 | * a0 = signal number | |
704 | * a1 = 0 (should be cause) | |
705 | * a2 = pointer to ucontext | |
706 | * | |
707 | * $25 and c0_epc point to the signal handler, $29 points to | |
708 | * the struct rt_sigframe32. | |
709 | */ | |
710 | regs->regs[ 4] = signr; | |
711 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
712 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
713 | regs->regs[29] = (unsigned long) frame; | |
714 | regs->regs[31] = (unsigned long) frame->rs_code; | |
715 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
716 | ||
717 | #if DEBUG_SIG | |
718 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
719 | current->comm, current->pid, | |
720 | frame, regs->cp0_epc, frame->rs_code); | |
721 | #endif | |
722 | return; | |
723 | ||
724 | give_sigsegv: | |
725 | force_sigsegv(signr, current); | |
726 | } | |
727 | ||
728 | static inline void handle_signal(unsigned long sig, siginfo_t *info, | |
729 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs) | |
730 | { | |
731 | switch (regs->regs[0]) { | |
732 | case ERESTART_RESTARTBLOCK: | |
733 | case ERESTARTNOHAND: | |
734 | regs->regs[2] = EINTR; | |
735 | break; | |
736 | case ERESTARTSYS: | |
737 | if(!(ka->sa.sa_flags & SA_RESTART)) { | |
738 | regs->regs[2] = EINTR; | |
739 | break; | |
740 | } | |
741 | /* fallthrough */ | |
742 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
743 | regs->regs[7] = regs->regs[26]; | |
744 | regs->cp0_epc -= 8; | |
745 | } | |
746 | ||
747 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
748 | ||
749 | if (ka->sa.sa_flags & SA_SIGINFO) | |
750 | setup_rt_frame(ka, regs, sig, oldset, info); | |
751 | else | |
752 | setup_frame(ka, regs, sig, oldset); | |
753 | ||
69be8f18 SR |
754 | spin_lock_irq(¤t->sighand->siglock); |
755 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
756 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 757 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
758 | recalc_sigpending(); |
759 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
760 | } |
761 | ||
762 | int do_signal32(sigset_t *oldset, struct pt_regs *regs) | |
763 | { | |
764 | struct k_sigaction ka; | |
765 | siginfo_t info; | |
766 | int signr; | |
767 | ||
768 | /* | |
769 | * We want the common case to go fast, which is why we may in certain | |
770 | * cases get here from kernel mode. Just return without doing anything | |
771 | * if so. | |
772 | */ | |
773 | if (!user_mode(regs)) | |
774 | return 1; | |
775 | ||
0e6c1f5f | 776 | if (try_to_freeze()) |
1da177e4 LT |
777 | goto no_signal; |
778 | ||
779 | if (!oldset) | |
780 | oldset = ¤t->blocked; | |
781 | ||
782 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
783 | if (signr > 0) { | |
784 | handle_signal(signr, &info, &ka, oldset, regs); | |
785 | return 1; | |
786 | } | |
787 | ||
788 | no_signal: | |
789 | /* | |
790 | * Who's code doesn't conform to the restartable syscall convention | |
791 | * dies here!!! The li instruction, a single machine instruction, | |
792 | * must directly be followed by the syscall instruction. | |
793 | */ | |
794 | if (regs->regs[0]) { | |
795 | if (regs->regs[2] == ERESTARTNOHAND || | |
796 | regs->regs[2] == ERESTARTSYS || | |
797 | regs->regs[2] == ERESTARTNOINTR) { | |
798 | regs->regs[7] = regs->regs[26]; | |
799 | regs->cp0_epc -= 8; | |
800 | } | |
801 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
802 | regs->regs[2] = __NR_O32_restart_syscall; | |
803 | regs->regs[7] = regs->regs[26]; | |
804 | regs->cp0_epc -= 4; | |
805 | } | |
806 | } | |
807 | return 0; | |
808 | } | |
809 | ||
810 | asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 *act, | |
811 | struct sigaction32 *oact, | |
812 | unsigned int sigsetsize) | |
813 | { | |
814 | struct k_sigaction new_sa, old_sa; | |
815 | int ret = -EINVAL; | |
816 | ||
817 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
818 | if (sigsetsize != sizeof(sigset_t)) | |
819 | goto out; | |
820 | ||
821 | if (act) { | |
822 | int err = 0; | |
823 | ||
824 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
825 | return -EFAULT; | |
826 | err |= __get_user((u32)(u64)new_sa.sa.sa_handler, | |
827 | &act->sa_handler); | |
828 | err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags); | |
829 | err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask); | |
830 | if (err) | |
831 | return -EFAULT; | |
832 | } | |
833 | ||
834 | ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); | |
835 | ||
836 | if (!ret && oact) { | |
837 | int err = 0; | |
838 | ||
839 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
840 | return -EFAULT; | |
841 | ||
842 | err |= __put_user((u32)(u64)old_sa.sa.sa_handler, | |
843 | &oact->sa_handler); | |
844 | err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags); | |
845 | err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask); | |
846 | if (err) | |
847 | return -EFAULT; | |
848 | } | |
849 | out: | |
850 | return ret; | |
851 | } | |
852 | ||
853 | asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t *set, | |
854 | compat_sigset_t *oset, unsigned int sigsetsize) | |
855 | { | |
856 | sigset_t old_set, new_set; | |
857 | int ret; | |
858 | mm_segment_t old_fs = get_fs(); | |
859 | ||
860 | if (set && get_sigset(&new_set, set)) | |
861 | return -EFAULT; | |
862 | ||
863 | set_fs (KERNEL_DS); | |
864 | ret = sys_rt_sigprocmask(how, set ? &new_set : NULL, | |
865 | oset ? &old_set : NULL, sigsetsize); | |
866 | set_fs (old_fs); | |
867 | ||
868 | if (!ret && oset && put_sigset(&old_set, oset)) | |
869 | return -EFAULT; | |
870 | ||
871 | return ret; | |
872 | } | |
873 | ||
874 | asmlinkage int sys32_rt_sigpending(compat_sigset_t *uset, | |
875 | unsigned int sigsetsize) | |
876 | { | |
877 | int ret; | |
878 | sigset_t set; | |
879 | mm_segment_t old_fs = get_fs(); | |
880 | ||
881 | set_fs (KERNEL_DS); | |
882 | ret = sys_rt_sigpending(&set, sigsetsize); | |
883 | set_fs (old_fs); | |
884 | ||
885 | if (!ret && put_sigset(&set, uset)) | |
886 | return -EFAULT; | |
887 | ||
888 | return ret; | |
889 | } | |
890 | ||
891 | asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t *uinfo) | |
892 | { | |
893 | siginfo_t info; | |
894 | int ret; | |
895 | mm_segment_t old_fs = get_fs(); | |
896 | ||
897 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || | |
898 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE)) | |
899 | return -EFAULT; | |
900 | set_fs (KERNEL_DS); | |
901 | ret = sys_rt_sigqueueinfo(pid, sig, &info); | |
902 | set_fs (old_fs); | |
903 | return ret; | |
904 | } |