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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 | */ | |
02416dcf | 10 | #include <linux/cache.h> |
1da177e4 LT |
11 | #include <linux/sched.h> |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
14 | #include <linux/smp_lock.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/signal.h> | |
17 | #include <linux/syscalls.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/compat.h> | |
22 | #include <linux/suspend.h> | |
23 | #include <linux/compiler.h> | |
24 | ||
e50c0a8f | 25 | #include <asm/abi.h> |
1da177e4 LT |
26 | #include <asm/asm.h> |
27 | #include <linux/bitops.h> | |
28 | #include <asm/cacheflush.h> | |
29 | #include <asm/sim.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/ucontext.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/fpu.h> | |
02416dcf | 34 | #include <asm/war.h> |
1da177e4 LT |
35 | |
36 | #define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3) | |
37 | ||
38 | typedef struct compat_siginfo { | |
39 | int si_signo; | |
40 | int si_code; | |
41 | int si_errno; | |
42 | ||
43 | union { | |
44 | int _pad[SI_PAD_SIZE32]; | |
45 | ||
46 | /* kill() */ | |
47 | struct { | |
48 | compat_pid_t _pid; /* sender's pid */ | |
49 | compat_uid_t _uid; /* sender's uid */ | |
50 | } _kill; | |
51 | ||
52 | /* SIGCHLD */ | |
53 | struct { | |
54 | compat_pid_t _pid; /* which child */ | |
55 | compat_uid_t _uid; /* sender's uid */ | |
56 | int _status; /* exit code */ | |
57 | compat_clock_t _utime; | |
58 | compat_clock_t _stime; | |
59 | } _sigchld; | |
60 | ||
61 | /* IRIX SIGCHLD */ | |
62 | struct { | |
63 | compat_pid_t _pid; /* which child */ | |
64 | compat_clock_t _utime; | |
65 | int _status; /* exit code */ | |
66 | compat_clock_t _stime; | |
67 | } _irix_sigchld; | |
68 | ||
69 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ | |
70 | struct { | |
71 | s32 _addr; /* faulting insn/memory ref. */ | |
72 | } _sigfault; | |
73 | ||
74 | /* SIGPOLL, SIGXFSZ (To do ...) */ | |
75 | struct { | |
76 | int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ | |
77 | int _fd; | |
78 | } _sigpoll; | |
79 | ||
80 | /* POSIX.1b timers */ | |
81 | struct { | |
a982099c RB |
82 | timer_t _tid; /* timer id */ |
83 | int _overrun; /* overrun count */ | |
209ac8dd | 84 | compat_sigval_t _sigval;/* same as below */ |
a982099c | 85 | int _sys_private; /* not to be passed to user */ |
1da177e4 LT |
86 | } _timer; |
87 | ||
88 | /* POSIX.1b signals */ | |
89 | struct { | |
90 | compat_pid_t _pid; /* sender's pid */ | |
91 | compat_uid_t _uid; /* sender's uid */ | |
92 | compat_sigval_t _sigval; | |
93 | } _rt; | |
94 | ||
95 | } _sifields; | |
96 | } compat_siginfo_t; | |
97 | ||
98 | /* | |
99 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
100 | */ | |
101 | #define __NR_O32_sigreturn 4119 | |
102 | #define __NR_O32_rt_sigreturn 4193 | |
103 | #define __NR_O32_restart_syscall 4253 | |
104 | ||
105 | #define DEBUG_SIG 0 | |
106 | ||
107 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
108 | ||
109 | extern int do_signal32(sigset_t *oldset, struct pt_regs *regs); | |
110 | ||
111 | /* 32-bit compatibility types */ | |
112 | ||
113 | #define _NSIG_BPW32 32 | |
114 | #define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32) | |
115 | ||
116 | typedef struct { | |
117 | unsigned int sig[_NSIG_WORDS32]; | |
118 | } sigset_t32; | |
119 | ||
120 | typedef unsigned int __sighandler32_t; | |
121 | typedef void (*vfptr_t)(void); | |
122 | ||
123 | struct sigaction32 { | |
124 | unsigned int sa_flags; | |
125 | __sighandler32_t sa_handler; | |
126 | compat_sigset_t sa_mask; | |
127 | }; | |
128 | ||
129 | /* IRIX compatible stack_t */ | |
130 | typedef struct sigaltstack32 { | |
131 | s32 ss_sp; | |
132 | compat_size_t ss_size; | |
133 | int ss_flags; | |
134 | } stack32_t; | |
135 | ||
136 | struct ucontext32 { | |
137 | u32 uc_flags; | |
138 | s32 uc_link; | |
139 | stack32_t uc_stack; | |
140 | struct sigcontext32 uc_mcontext; | |
141 | sigset_t32 uc_sigmask; /* mask last for extensibility */ | |
142 | }; | |
143 | ||
144 | extern void __put_sigset_unknown_nsig(void); | |
145 | extern void __get_sigset_unknown_nsig(void); | |
146 | ||
147 | static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t *ubuf) | |
148 | { | |
149 | int err = 0; | |
150 | ||
151 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) | |
152 | return -EFAULT; | |
153 | ||
154 | switch (_NSIG_WORDS) { | |
155 | default: | |
156 | __put_sigset_unknown_nsig(); | |
157 | case 2: | |
158 | err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]); | |
159 | err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); | |
160 | case 1: | |
161 | err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]); | |
162 | err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); | |
163 | } | |
164 | ||
165 | return err; | |
166 | } | |
167 | ||
168 | static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf) | |
169 | { | |
170 | int err = 0; | |
171 | unsigned long sig[4]; | |
172 | ||
173 | if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) | |
174 | return -EFAULT; | |
175 | ||
176 | switch (_NSIG_WORDS) { | |
177 | default: | |
178 | __get_sigset_unknown_nsig(); | |
179 | case 2: | |
180 | err |= __get_user (sig[3], &ubuf->sig[3]); | |
181 | err |= __get_user (sig[2], &ubuf->sig[2]); | |
182 | kbuf->sig[1] = sig[2] | (sig[3] << 32); | |
183 | case 1: | |
184 | err |= __get_user (sig[1], &ubuf->sig[1]); | |
185 | err |= __get_user (sig[0], &ubuf->sig[0]); | |
186 | kbuf->sig[0] = sig[0] | (sig[1] << 32); | |
187 | } | |
188 | ||
189 | return err; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Atomically swap in the new signal mask, and wait for a signal. | |
194 | */ | |
195 | ||
196 | save_static_function(sys32_sigsuspend); | |
197 | __attribute_used__ noinline static int | |
198 | _sys32_sigsuspend(nabi_no_regargs struct pt_regs regs) | |
199 | { | |
200 | compat_sigset_t *uset; | |
201 | sigset_t newset, saveset; | |
202 | ||
203 | uset = (compat_sigset_t *) regs.regs[4]; | |
204 | if (get_sigset(&newset, uset)) | |
205 | return -EFAULT; | |
206 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
207 | ||
208 | spin_lock_irq(¤t->sighand->siglock); | |
209 | saveset = current->blocked; | |
210 | current->blocked = newset; | |
211 | recalc_sigpending(); | |
212 | spin_unlock_irq(¤t->sighand->siglock); | |
213 | ||
214 | regs.regs[2] = EINTR; | |
215 | regs.regs[7] = 1; | |
216 | while (1) { | |
217 | current->state = TASK_INTERRUPTIBLE; | |
218 | schedule(); | |
219 | if (do_signal32(&saveset, ®s)) | |
220 | return -EINTR; | |
221 | } | |
222 | } | |
223 | ||
224 | save_static_function(sys32_rt_sigsuspend); | |
225 | __attribute_used__ noinline static int | |
226 | _sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) | |
227 | { | |
228 | compat_sigset_t *uset; | |
229 | sigset_t newset, saveset; | |
230 | size_t sigsetsize; | |
231 | ||
232 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
233 | sigsetsize = regs.regs[5]; | |
234 | if (sigsetsize != sizeof(compat_sigset_t)) | |
235 | return -EINVAL; | |
236 | ||
237 | uset = (compat_sigset_t *) regs.regs[4]; | |
238 | if (get_sigset(&newset, uset)) | |
239 | return -EFAULT; | |
240 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
241 | ||
242 | spin_lock_irq(¤t->sighand->siglock); | |
243 | saveset = current->blocked; | |
244 | current->blocked = newset; | |
245 | recalc_sigpending(); | |
246 | spin_unlock_irq(¤t->sighand->siglock); | |
247 | ||
248 | regs.regs[2] = EINTR; | |
249 | regs.regs[7] = 1; | |
250 | while (1) { | |
251 | current->state = TASK_INTERRUPTIBLE; | |
252 | schedule(); | |
253 | if (do_signal32(&saveset, ®s)) | |
254 | return -EINTR; | |
255 | } | |
256 | } | |
257 | ||
258 | asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act, | |
259 | struct sigaction32 *oact) | |
260 | { | |
261 | struct k_sigaction new_ka, old_ka; | |
262 | int ret; | |
263 | int err = 0; | |
264 | ||
265 | if (act) { | |
266 | old_sigset_t mask; | |
77c728c2 | 267 | s32 handler; |
1da177e4 LT |
268 | |
269 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
270 | return -EFAULT; | |
77c728c2 RB |
271 | err |= __get_user(handler, &act->sa_handler); |
272 | new_ka.sa.sa_handler = (void*)(s64)handler; | |
1da177e4 LT |
273 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
274 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
275 | if (err) | |
276 | return -EFAULT; | |
277 | ||
278 | siginitset(&new_ka.sa.sa_mask, mask); | |
279 | } | |
280 | ||
281 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
282 | ||
283 | if (!ret && oact) { | |
284 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
285 | return -EFAULT; | |
286 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
287 | err |= __put_user((u32)(u64)old_ka.sa.sa_handler, | |
288 | &oact->sa_handler); | |
289 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
290 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
291 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
292 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
293 | if (err) | |
294 | return -EFAULT; | |
295 | } | |
296 | ||
297 | return ret; | |
298 | } | |
299 | ||
300 | asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
301 | { | |
302 | const stack32_t *uss = (const stack32_t *) regs.regs[4]; | |
303 | stack32_t *uoss = (stack32_t *) regs.regs[5]; | |
304 | unsigned long usp = regs.regs[29]; | |
305 | stack_t kss, koss; | |
306 | int ret, err = 0; | |
307 | mm_segment_t old_fs = get_fs(); | |
308 | s32 sp; | |
309 | ||
310 | if (uss) { | |
311 | if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) | |
312 | return -EFAULT; | |
313 | err |= __get_user(sp, &uss->ss_sp); | |
314 | kss.ss_sp = (void *) (long) sp; | |
315 | err |= __get_user(kss.ss_size, &uss->ss_size); | |
316 | err |= __get_user(kss.ss_flags, &uss->ss_flags); | |
317 | if (err) | |
318 | return -EFAULT; | |
319 | } | |
320 | ||
321 | set_fs (KERNEL_DS); | |
322 | ret = do_sigaltstack(uss ? &kss : NULL , uoss ? &koss : NULL, usp); | |
323 | set_fs (old_fs); | |
324 | ||
325 | if (!ret && uoss) { | |
326 | if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) | |
327 | return -EFAULT; | |
328 | sp = (int) (long) koss.ss_sp; | |
329 | err |= __put_user(sp, &uoss->ss_sp); | |
330 | err |= __put_user(koss.ss_size, &uoss->ss_size); | |
331 | err |= __put_user(koss.ss_flags, &uoss->ss_flags); | |
332 | if (err) | |
333 | return -EFAULT; | |
334 | } | |
335 | return ret; | |
336 | } | |
337 | ||
338 | static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 *sc) | |
339 | { | |
e50c0a8f | 340 | u32 used_math; |
1da177e4 | 341 | int err = 0; |
e50c0a8f | 342 | s32 treg; |
1da177e4 LT |
343 | |
344 | /* Always make any pending restarted system calls return -EINTR */ | |
345 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
346 | ||
347 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
348 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
349 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
e50c0a8f RB |
350 | if (cpu_has_dsp) { |
351 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
352 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
353 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
354 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
355 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
356 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
357 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
358 | } | |
1da177e4 LT |
359 | |
360 | #define restore_gp_reg(i) do { \ | |
361 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ | |
362 | } while(0) | |
363 | restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); | |
364 | restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); | |
365 | restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); | |
366 | restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); | |
367 | restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); | |
368 | restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); | |
369 | restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); | |
370 | restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); | |
371 | restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); | |
372 | restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); | |
373 | restore_gp_reg(31); | |
374 | #undef restore_gp_reg | |
375 | ||
376 | err |= __get_user(used_math, &sc->sc_used_math); | |
377 | conditional_used_math(used_math); | |
378 | ||
379 | preempt_disable(); | |
380 | ||
381 | if (used_math()) { | |
382 | /* restore fpu context if we have used it before */ | |
383 | own_fpu(); | |
384 | err |= restore_fp_context32(sc); | |
385 | } else { | |
386 | /* signal handler may have used FPU. Give it up. */ | |
387 | lose_fpu(); | |
388 | } | |
389 | ||
390 | preempt_enable(); | |
391 | ||
392 | return err; | |
393 | } | |
394 | ||
395 | struct sigframe { | |
396 | u32 sf_ass[4]; /* argument save space for o32 */ | |
02416dcf RB |
397 | #if ICACHE_REFILLS_WORKAROUND_WAR |
398 | u32 sf_pad[2]; | |
399 | #else | |
1da177e4 | 400 | u32 sf_code[2]; /* signal trampoline */ |
02416dcf | 401 | #endif |
1da177e4 LT |
402 | struct sigcontext32 sf_sc; |
403 | sigset_t sf_mask; | |
02416dcf RB |
404 | #if ICACHE_REFILLS_WORKAROUND_WAR |
405 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ | |
406 | #endif | |
1da177e4 LT |
407 | }; |
408 | ||
409 | struct rt_sigframe32 { | |
410 | u32 rs_ass[4]; /* argument save space for o32 */ | |
02416dcf RB |
411 | #if ICACHE_REFILLS_WORKAROUND_WAR |
412 | u32 rs_pad[2]; | |
413 | #else | |
1da177e4 | 414 | u32 rs_code[2]; /* signal trampoline */ |
02416dcf | 415 | #endif |
1da177e4 LT |
416 | compat_siginfo_t rs_info; |
417 | struct ucontext32 rs_uc; | |
02416dcf RB |
418 | #if ICACHE_REFILLS_WORKAROUND_WAR |
419 | u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */ | |
420 | #endif | |
1da177e4 LT |
421 | }; |
422 | ||
423 | int copy_siginfo_to_user32(compat_siginfo_t *to, siginfo_t *from) | |
424 | { | |
425 | int err; | |
426 | ||
427 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
428 | return -EFAULT; | |
429 | ||
430 | /* If you change siginfo_t structure, please be sure | |
431 | this code is fixed accordingly. | |
432 | It should never copy any pad contained in the structure | |
433 | to avoid security leaks, but must copy the generic | |
434 | 3 ints plus the relevant union member. | |
435 | This routine must convert siginfo from 64bit to 32bit as well | |
436 | at the same time. */ | |
437 | err = __put_user(from->si_signo, &to->si_signo); | |
438 | err |= __put_user(from->si_errno, &to->si_errno); | |
439 | err |= __put_user((short)from->si_code, &to->si_code); | |
440 | if (from->si_code < 0) | |
441 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
442 | else { | |
443 | switch (from->si_code >> 16) { | |
a982099c RB |
444 | case __SI_TIMER >> 16: |
445 | err |= __put_user(from->si_tid, &to->si_tid); | |
446 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
447 | err |= __put_user(from->si_int, &to->si_int); | |
448 | break; | |
1da177e4 LT |
449 | case __SI_CHLD >> 16: |
450 | err |= __put_user(from->si_utime, &to->si_utime); | |
451 | err |= __put_user(from->si_stime, &to->si_stime); | |
452 | err |= __put_user(from->si_status, &to->si_status); | |
453 | default: | |
454 | err |= __put_user(from->si_pid, &to->si_pid); | |
455 | err |= __put_user(from->si_uid, &to->si_uid); | |
456 | break; | |
457 | case __SI_FAULT >> 16: | |
458 | err |= __put_user((long)from->si_addr, &to->si_addr); | |
459 | break; | |
460 | case __SI_POLL >> 16: | |
461 | err |= __put_user(from->si_band, &to->si_band); | |
462 | err |= __put_user(from->si_fd, &to->si_fd); | |
463 | break; | |
464 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
465 | case __SI_MESGQ >> 16: | |
466 | err |= __put_user(from->si_pid, &to->si_pid); | |
467 | err |= __put_user(from->si_uid, &to->si_uid); | |
468 | err |= __put_user(from->si_int, &to->si_int); | |
469 | break; | |
470 | } | |
471 | } | |
472 | return err; | |
473 | } | |
474 | ||
475 | save_static_function(sys32_sigreturn); | |
476 | __attribute_used__ noinline static void | |
477 | _sys32_sigreturn(nabi_no_regargs struct pt_regs regs) | |
478 | { | |
479 | struct sigframe *frame; | |
480 | sigset_t blocked; | |
481 | ||
482 | frame = (struct sigframe *) regs.regs[29]; | |
483 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
484 | goto badframe; | |
485 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
486 | goto badframe; | |
487 | ||
488 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
489 | spin_lock_irq(¤t->sighand->siglock); | |
490 | current->blocked = blocked; | |
491 | recalc_sigpending(); | |
492 | spin_unlock_irq(¤t->sighand->siglock); | |
493 | ||
494 | if (restore_sigcontext32(®s, &frame->sf_sc)) | |
495 | goto badframe; | |
496 | ||
497 | /* | |
498 | * Don't let your children do this ... | |
499 | */ | |
500 | if (current_thread_info()->flags & TIF_SYSCALL_TRACE) | |
501 | do_syscall_trace(®s, 1); | |
502 | __asm__ __volatile__( | |
503 | "move\t$29, %0\n\t" | |
504 | "j\tsyscall_exit" | |
505 | :/* no outputs */ | |
506 | :"r" (®s)); | |
507 | /* Unreached */ | |
508 | ||
509 | badframe: | |
510 | force_sig(SIGSEGV, current); | |
511 | } | |
512 | ||
513 | save_static_function(sys32_rt_sigreturn); | |
514 | __attribute_used__ noinline static void | |
515 | _sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) | |
516 | { | |
517 | struct rt_sigframe32 *frame; | |
1fcf1cc7 | 518 | mm_segment_t old_fs; |
1da177e4 LT |
519 | sigset_t set; |
520 | stack_t st; | |
521 | s32 sp; | |
522 | ||
523 | frame = (struct rt_sigframe32 *) regs.regs[29]; | |
524 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
525 | goto badframe; | |
526 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
527 | goto badframe; | |
528 | ||
529 | sigdelsetmask(&set, ~_BLOCKABLE); | |
530 | spin_lock_irq(¤t->sighand->siglock); | |
531 | current->blocked = set; | |
532 | recalc_sigpending(); | |
533 | spin_unlock_irq(¤t->sighand->siglock); | |
534 | ||
535 | if (restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext)) | |
536 | goto badframe; | |
537 | ||
538 | /* The ucontext contains a stack32_t, so we must convert! */ | |
539 | if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) | |
540 | goto badframe; | |
541 | st.ss_size = (long) sp; | |
542 | if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) | |
543 | goto badframe; | |
544 | if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) | |
545 | goto badframe; | |
546 | ||
547 | /* It is more difficult to avoid calling this function than to | |
548 | call it and ignore errors. */ | |
1fcf1cc7 RB |
549 | old_fs = get_fs(); |
550 | set_fs (KERNEL_DS); | |
1da177e4 | 551 | do_sigaltstack(&st, NULL, regs.regs[29]); |
1fcf1cc7 | 552 | set_fs (old_fs); |
1da177e4 LT |
553 | |
554 | /* | |
555 | * Don't let your children do this ... | |
556 | */ | |
557 | __asm__ __volatile__( | |
558 | "move\t$29, %0\n\t" | |
559 | "j\tsyscall_exit" | |
560 | :/* no outputs */ | |
561 | :"r" (®s)); | |
562 | /* Unreached */ | |
563 | ||
564 | badframe: | |
565 | force_sig(SIGSEGV, current); | |
566 | } | |
567 | ||
568 | static inline int setup_sigcontext32(struct pt_regs *regs, | |
569 | struct sigcontext32 *sc) | |
570 | { | |
571 | int err = 0; | |
572 | ||
573 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
574 | err |= __put_user(regs->cp0_status, &sc->sc_status); | |
575 | ||
576 | #define save_gp_reg(i) { \ | |
577 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ | |
578 | } while(0) | |
579 | __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); | |
580 | save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); | |
581 | save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); | |
582 | save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); | |
583 | save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); | |
584 | save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); | |
585 | save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); | |
586 | save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); | |
587 | save_gp_reg(31); | |
588 | #undef save_gp_reg | |
589 | ||
590 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
591 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
e50c0a8f RB |
592 | if (cpu_has_dsp) { |
593 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_hi1); | |
594 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
595 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
596 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
597 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
598 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
599 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
600 | } | |
1da177e4 LT |
601 | |
602 | err |= __put_user(!!used_math(), &sc->sc_used_math); | |
603 | ||
604 | if (!used_math()) | |
605 | goto out; | |
606 | ||
42a3b4f2 | 607 | /* |
1da177e4 LT |
608 | * Save FPU state to signal context. Signal handler will "inherit" |
609 | * current FPU state. | |
610 | */ | |
611 | preempt_disable(); | |
612 | ||
613 | if (!is_fpu_owner()) { | |
614 | own_fpu(); | |
615 | restore_fp(current); | |
616 | } | |
617 | err |= save_fp_context32(sc); | |
618 | ||
619 | preempt_enable(); | |
620 | ||
621 | out: | |
622 | return err; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Determine which stack to use.. | |
627 | */ | |
628 | static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
629 | size_t frame_size) | |
630 | { | |
631 | unsigned long sp; | |
632 | ||
633 | /* Default to using normal stack */ | |
634 | sp = regs->regs[29]; | |
635 | ||
636 | /* | |
637 | * FPU emulator may have it's own trampoline active just | |
638 | * above the user stack, 16-bytes before the next lowest | |
639 | * 16 byte boundary. Try to avoid trashing it. | |
640 | */ | |
641 | sp -= 32; | |
642 | ||
643 | /* This is the X/Open sanctioned signal stack switching. */ | |
644 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
645 | sp = current->sas_ss_sp + current->sas_ss_size; | |
646 | ||
647 | return (void *)((sp - frame_size) & ALMASK); | |
648 | } | |
649 | ||
e50c0a8f | 650 | void setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
651 | int signr, sigset_t *set) |
652 | { | |
653 | struct sigframe *frame; | |
654 | int err = 0; | |
655 | ||
656 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
657 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
658 | goto give_sigsegv; | |
659 | ||
660 | /* | |
661 | * Set up the return code ... | |
662 | * | |
663 | * li v0, __NR_O32_sigreturn | |
664 | * syscall | |
665 | */ | |
666 | err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0); | |
667 | err |= __put_user(0x0000000c , frame->sf_code + 1); | |
668 | flush_cache_sigtramp((unsigned long) frame->sf_code); | |
669 | ||
670 | err |= setup_sigcontext32(regs, &frame->sf_sc); | |
671 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
672 | if (err) | |
673 | goto give_sigsegv; | |
674 | ||
675 | /* | |
676 | * Arguments to signal handler: | |
677 | * | |
678 | * a0 = signal number | |
679 | * a1 = 0 (should be cause) | |
680 | * a2 = pointer to struct sigcontext | |
681 | * | |
682 | * $25 and c0_epc point to the signal handler, $29 points to the | |
683 | * struct sigframe. | |
684 | */ | |
685 | regs->regs[ 4] = signr; | |
686 | regs->regs[ 5] = 0; | |
687 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
688 | regs->regs[29] = (unsigned long) frame; | |
689 | regs->regs[31] = (unsigned long) frame->sf_code; | |
690 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
691 | ||
692 | #if DEBUG_SIG | |
693 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
694 | current->comm, current->pid, | |
695 | frame, regs->cp0_epc, frame->sf_code); | |
696 | #endif | |
697 | return; | |
698 | ||
699 | give_sigsegv: | |
700 | force_sigsegv(signr, current); | |
701 | } | |
702 | ||
e50c0a8f | 703 | void setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) |
1da177e4 LT |
704 | { |
705 | struct rt_sigframe32 *frame; | |
706 | int err = 0; | |
707 | s32 sp; | |
708 | ||
709 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
710 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
711 | goto give_sigsegv; | |
712 | ||
713 | /* Set up to return from userspace. If provided, use a stub already | |
714 | in userspace. */ | |
715 | /* | |
716 | * Set up the return code ... | |
717 | * | |
718 | * li v0, __NR_O32_rt_sigreturn | |
719 | * syscall | |
720 | */ | |
721 | err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0); | |
722 | err |= __put_user(0x0000000c , frame->rs_code + 1); | |
723 | flush_cache_sigtramp((unsigned long) frame->rs_code); | |
724 | ||
725 | /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ | |
726 | err |= copy_siginfo_to_user32(&frame->rs_info, info); | |
727 | ||
728 | /* Create the ucontext. */ | |
729 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
730 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
731 | sp = (int) (long) current->sas_ss_sp; | |
732 | err |= __put_user(sp, | |
733 | &frame->rs_uc.uc_stack.ss_sp); | |
734 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
735 | &frame->rs_uc.uc_stack.ss_flags); | |
736 | err |= __put_user(current->sas_ss_size, | |
737 | &frame->rs_uc.uc_stack.ss_size); | |
738 | err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); | |
739 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
740 | ||
741 | if (err) | |
742 | goto give_sigsegv; | |
743 | ||
744 | /* | |
745 | * Arguments to signal handler: | |
746 | * | |
747 | * a0 = signal number | |
748 | * a1 = 0 (should be cause) | |
749 | * a2 = pointer to ucontext | |
750 | * | |
751 | * $25 and c0_epc point to the signal handler, $29 points to | |
752 | * the struct rt_sigframe32. | |
753 | */ | |
754 | regs->regs[ 4] = signr; | |
755 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
756 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
757 | regs->regs[29] = (unsigned long) frame; | |
758 | regs->regs[31] = (unsigned long) frame->rs_code; | |
759 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
760 | ||
761 | #if DEBUG_SIG | |
762 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
763 | current->comm, current->pid, | |
764 | frame, regs->cp0_epc, frame->rs_code); | |
765 | #endif | |
766 | return; | |
767 | ||
768 | give_sigsegv: | |
769 | force_sigsegv(signr, current); | |
770 | } | |
771 | ||
129bc8f7 | 772 | static inline int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
773 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs) |
774 | { | |
129bc8f7 RB |
775 | int ret; |
776 | ||
1da177e4 LT |
777 | switch (regs->regs[0]) { |
778 | case ERESTART_RESTARTBLOCK: | |
779 | case ERESTARTNOHAND: | |
780 | regs->regs[2] = EINTR; | |
781 | break; | |
782 | case ERESTARTSYS: | |
783 | if(!(ka->sa.sa_flags & SA_RESTART)) { | |
784 | regs->regs[2] = EINTR; | |
785 | break; | |
786 | } | |
787 | /* fallthrough */ | |
788 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
789 | regs->regs[7] = regs->regs[26]; | |
790 | regs->cp0_epc -= 8; | |
791 | } | |
792 | ||
793 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
794 | ||
795 | if (ka->sa.sa_flags & SA_SIGINFO) | |
129bc8f7 | 796 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
1da177e4 | 797 | else |
129bc8f7 | 798 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
1da177e4 | 799 | |
69be8f18 SR |
800 | spin_lock_irq(¤t->sighand->siglock); |
801 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
802 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 803 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
804 | recalc_sigpending(); |
805 | spin_unlock_irq(¤t->sighand->siglock); | |
129bc8f7 RB |
806 | |
807 | return ret; | |
1da177e4 LT |
808 | } |
809 | ||
810 | int do_signal32(sigset_t *oldset, struct pt_regs *regs) | |
811 | { | |
812 | struct k_sigaction ka; | |
813 | siginfo_t info; | |
814 | int signr; | |
815 | ||
816 | /* | |
817 | * We want the common case to go fast, which is why we may in certain | |
818 | * cases get here from kernel mode. Just return without doing anything | |
819 | * if so. | |
820 | */ | |
821 | if (!user_mode(regs)) | |
822 | return 1; | |
823 | ||
0e6c1f5f | 824 | if (try_to_freeze()) |
1da177e4 LT |
825 | goto no_signal; |
826 | ||
827 | if (!oldset) | |
828 | oldset = ¤t->blocked; | |
829 | ||
830 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
129bc8f7 RB |
831 | if (signr > 0) |
832 | return handle_signal(signr, &info, &ka, oldset, regs); | |
1da177e4 LT |
833 | |
834 | no_signal: | |
835 | /* | |
836 | * Who's code doesn't conform to the restartable syscall convention | |
837 | * dies here!!! The li instruction, a single machine instruction, | |
838 | * must directly be followed by the syscall instruction. | |
839 | */ | |
840 | if (regs->regs[0]) { | |
841 | if (regs->regs[2] == ERESTARTNOHAND || | |
842 | regs->regs[2] == ERESTARTSYS || | |
843 | regs->regs[2] == ERESTARTNOINTR) { | |
844 | regs->regs[7] = regs->regs[26]; | |
845 | regs->cp0_epc -= 8; | |
846 | } | |
847 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
848 | regs->regs[2] = __NR_O32_restart_syscall; | |
849 | regs->regs[7] = regs->regs[26]; | |
850 | regs->cp0_epc -= 4; | |
851 | } | |
852 | } | |
853 | return 0; | |
854 | } | |
855 | ||
856 | asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 *act, | |
857 | struct sigaction32 *oact, | |
858 | unsigned int sigsetsize) | |
859 | { | |
860 | struct k_sigaction new_sa, old_sa; | |
861 | int ret = -EINVAL; | |
862 | ||
863 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
864 | if (sigsetsize != sizeof(sigset_t)) | |
865 | goto out; | |
866 | ||
867 | if (act) { | |
77c728c2 | 868 | s32 handler; |
1da177e4 LT |
869 | int err = 0; |
870 | ||
871 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
872 | return -EFAULT; | |
77c728c2 RB |
873 | err |= __get_user(handler, &act->sa_handler); |
874 | new_sa.sa.sa_handler = (void*)(s64)handler; | |
1da177e4 LT |
875 | err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags); |
876 | err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask); | |
877 | if (err) | |
878 | return -EFAULT; | |
879 | } | |
880 | ||
881 | ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); | |
882 | ||
883 | if (!ret && oact) { | |
884 | int err = 0; | |
885 | ||
886 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
887 | return -EFAULT; | |
888 | ||
889 | err |= __put_user((u32)(u64)old_sa.sa.sa_handler, | |
890 | &oact->sa_handler); | |
891 | err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags); | |
892 | err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask); | |
893 | if (err) | |
894 | return -EFAULT; | |
895 | } | |
896 | out: | |
897 | return ret; | |
898 | } | |
899 | ||
900 | asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t *set, | |
901 | compat_sigset_t *oset, unsigned int sigsetsize) | |
902 | { | |
903 | sigset_t old_set, new_set; | |
904 | int ret; | |
905 | mm_segment_t old_fs = get_fs(); | |
906 | ||
907 | if (set && get_sigset(&new_set, set)) | |
908 | return -EFAULT; | |
909 | ||
910 | set_fs (KERNEL_DS); | |
911 | ret = sys_rt_sigprocmask(how, set ? &new_set : NULL, | |
912 | oset ? &old_set : NULL, sigsetsize); | |
913 | set_fs (old_fs); | |
914 | ||
915 | if (!ret && oset && put_sigset(&old_set, oset)) | |
916 | return -EFAULT; | |
917 | ||
918 | return ret; | |
919 | } | |
920 | ||
921 | asmlinkage int sys32_rt_sigpending(compat_sigset_t *uset, | |
922 | unsigned int sigsetsize) | |
923 | { | |
924 | int ret; | |
925 | sigset_t set; | |
926 | mm_segment_t old_fs = get_fs(); | |
927 | ||
928 | set_fs (KERNEL_DS); | |
929 | ret = sys_rt_sigpending(&set, sigsetsize); | |
930 | set_fs (old_fs); | |
931 | ||
932 | if (!ret && put_sigset(&set, uset)) | |
933 | return -EFAULT; | |
934 | ||
935 | return ret; | |
936 | } | |
937 | ||
938 | asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t *uinfo) | |
939 | { | |
940 | siginfo_t info; | |
941 | int ret; | |
942 | mm_segment_t old_fs = get_fs(); | |
943 | ||
944 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || | |
945 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE)) | |
946 | return -EFAULT; | |
947 | set_fs (KERNEL_DS); | |
948 | ret = sys_rt_sigqueueinfo(pid, sig, &info); | |
949 | set_fs (old_fs); | |
950 | return ret; | |
951 | } | |
54f2da75 RB |
952 | |
953 | asmlinkage long | |
954 | sys32_waitid(int which, compat_pid_t pid, | |
955 | compat_siginfo_t __user *uinfo, int options, | |
956 | struct compat_rusage __user *uru) | |
957 | { | |
958 | siginfo_t info; | |
959 | struct rusage ru; | |
960 | long ret; | |
961 | mm_segment_t old_fs = get_fs(); | |
962 | ||
963 | info.si_signo = 0; | |
964 | set_fs (KERNEL_DS); | |
965 | ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options, | |
966 | uru ? (struct rusage __user *) &ru : NULL); | |
967 | set_fs (old_fs); | |
968 | ||
969 | if (ret < 0 || info.si_signo == 0) | |
970 | return ret; | |
971 | ||
972 | if (uru && (ret = put_compat_rusage(&ru, uru))) | |
973 | return ret; | |
974 | ||
975 | BUG_ON(info.si_code & __SI_MASK); | |
976 | info.si_code |= __SI_CHLD; | |
977 | return copy_siginfo_to_user32(uinfo, &info); | |
978 | } |