Commit | Line | Data |
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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 | |
dda73d0b | 7 | * Copyright (C) 1994 - 2000, 2006 Ralf Baechle |
1da177e4 LT |
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 | ||
1da177e4 LT |
109 | /* 32-bit compatibility types */ |
110 | ||
111 | #define _NSIG_BPW32 32 | |
112 | #define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32) | |
113 | ||
114 | typedef struct { | |
115 | unsigned int sig[_NSIG_WORDS32]; | |
116 | } sigset_t32; | |
117 | ||
118 | typedef unsigned int __sighandler32_t; | |
119 | typedef void (*vfptr_t)(void); | |
120 | ||
121 | struct sigaction32 { | |
122 | unsigned int sa_flags; | |
123 | __sighandler32_t sa_handler; | |
124 | compat_sigset_t sa_mask; | |
125 | }; | |
126 | ||
127 | /* IRIX compatible stack_t */ | |
128 | typedef struct sigaltstack32 { | |
129 | s32 ss_sp; | |
130 | compat_size_t ss_size; | |
131 | int ss_flags; | |
132 | } stack32_t; | |
133 | ||
134 | struct ucontext32 { | |
135 | u32 uc_flags; | |
136 | s32 uc_link; | |
137 | stack32_t uc_stack; | |
138 | struct sigcontext32 uc_mcontext; | |
139 | sigset_t32 uc_sigmask; /* mask last for extensibility */ | |
140 | }; | |
141 | ||
142 | extern void __put_sigset_unknown_nsig(void); | |
143 | extern void __get_sigset_unknown_nsig(void); | |
144 | ||
9bbf28a3 | 145 | static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf) |
1da177e4 LT |
146 | { |
147 | int err = 0; | |
148 | ||
149 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) | |
150 | return -EFAULT; | |
151 | ||
152 | switch (_NSIG_WORDS) { | |
153 | default: | |
154 | __put_sigset_unknown_nsig(); | |
155 | case 2: | |
156 | err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]); | |
157 | err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); | |
158 | case 1: | |
159 | err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]); | |
160 | err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); | |
161 | } | |
162 | ||
163 | return err; | |
164 | } | |
165 | ||
9c6031cc | 166 | static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf) |
1da177e4 LT |
167 | { |
168 | int err = 0; | |
169 | unsigned long sig[4]; | |
170 | ||
171 | if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) | |
172 | return -EFAULT; | |
173 | ||
174 | switch (_NSIG_WORDS) { | |
175 | default: | |
176 | __get_sigset_unknown_nsig(); | |
177 | case 2: | |
178 | err |= __get_user (sig[3], &ubuf->sig[3]); | |
179 | err |= __get_user (sig[2], &ubuf->sig[2]); | |
180 | kbuf->sig[1] = sig[2] | (sig[3] << 32); | |
181 | case 1: | |
182 | err |= __get_user (sig[1], &ubuf->sig[1]); | |
183 | err |= __get_user (sig[0], &ubuf->sig[0]); | |
184 | kbuf->sig[0] = sig[0] | (sig[1] << 32); | |
185 | } | |
186 | ||
187 | return err; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Atomically swap in the new signal mask, and wait for a signal. | |
192 | */ | |
193 | ||
194 | save_static_function(sys32_sigsuspend); | |
195 | __attribute_used__ noinline static int | |
196 | _sys32_sigsuspend(nabi_no_regargs struct pt_regs regs) | |
197 | { | |
9c6031cc | 198 | compat_sigset_t __user *uset; |
68fa383f | 199 | sigset_t newset; |
1da177e4 | 200 | |
9c6031cc | 201 | uset = (compat_sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
202 | if (get_sigset(&newset, uset)) |
203 | return -EFAULT; | |
204 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
205 | ||
206 | spin_lock_irq(¤t->sighand->siglock); | |
68fa383f | 207 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
208 | current->blocked = newset; |
209 | recalc_sigpending(); | |
210 | spin_unlock_irq(¤t->sighand->siglock); | |
211 | ||
68fa383f MM |
212 | current->state = TASK_INTERRUPTIBLE; |
213 | schedule(); | |
214 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
215 | return -ERESTARTNOHAND; | |
1da177e4 LT |
216 | } |
217 | ||
218 | save_static_function(sys32_rt_sigsuspend); | |
219 | __attribute_used__ noinline static int | |
220 | _sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) | |
221 | { | |
9c6031cc | 222 | compat_sigset_t __user *uset; |
68fa383f | 223 | sigset_t newset; |
304416da | 224 | size_t sigsetsize; |
1da177e4 LT |
225 | |
226 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
227 | sigsetsize = regs.regs[5]; | |
228 | if (sigsetsize != sizeof(compat_sigset_t)) | |
229 | return -EINVAL; | |
230 | ||
9c6031cc | 231 | uset = (compat_sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
232 | if (get_sigset(&newset, uset)) |
233 | return -EFAULT; | |
234 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
235 | ||
236 | spin_lock_irq(¤t->sighand->siglock); | |
68fa383f | 237 | current->saved_sigmask = current->blocked; |
1da177e4 | 238 | current->blocked = newset; |
6254944f | 239 | recalc_sigpending(); |
1da177e4 LT |
240 | spin_unlock_irq(¤t->sighand->siglock); |
241 | ||
68fa383f MM |
242 | current->state = TASK_INTERRUPTIBLE; |
243 | schedule(); | |
244 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
245 | return -ERESTARTNOHAND; | |
1da177e4 LT |
246 | } |
247 | ||
9c6031cc AN |
248 | asmlinkage int sys32_sigaction(int sig, const struct sigaction32 __user *act, |
249 | struct sigaction32 __user *oact) | |
1da177e4 LT |
250 | { |
251 | struct k_sigaction new_ka, old_ka; | |
252 | int ret; | |
253 | int err = 0; | |
254 | ||
255 | if (act) { | |
256 | old_sigset_t mask; | |
77c728c2 | 257 | s32 handler; |
1da177e4 LT |
258 | |
259 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
260 | return -EFAULT; | |
77c728c2 | 261 | err |= __get_user(handler, &act->sa_handler); |
9bbf28a3 | 262 | new_ka.sa.sa_handler = (void __user *)(s64)handler; |
1da177e4 LT |
263 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
264 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
265 | if (err) | |
266 | return -EFAULT; | |
267 | ||
268 | siginitset(&new_ka.sa.sa_mask, mask); | |
269 | } | |
270 | ||
271 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
272 | ||
273 | if (!ret && oact) { | |
274 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
6254944f | 275 | return -EFAULT; |
1da177e4 LT |
276 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
277 | err |= __put_user((u32)(u64)old_ka.sa.sa_handler, | |
278 | &oact->sa_handler); | |
279 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
6254944f MM |
280 | err |= __put_user(0, &oact->sa_mask.sig[1]); |
281 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
282 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
283 | if (err) | |
1da177e4 LT |
284 | return -EFAULT; |
285 | } | |
286 | ||
287 | return ret; | |
288 | } | |
289 | ||
290 | asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
291 | { | |
9bbf28a3 AN |
292 | const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4]; |
293 | stack32_t __user *uoss = (stack32_t __user *) regs.regs[5]; | |
1da177e4 LT |
294 | unsigned long usp = regs.regs[29]; |
295 | stack_t kss, koss; | |
296 | int ret, err = 0; | |
297 | mm_segment_t old_fs = get_fs(); | |
298 | s32 sp; | |
299 | ||
300 | if (uss) { | |
301 | if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) | |
302 | return -EFAULT; | |
303 | err |= __get_user(sp, &uss->ss_sp); | |
9c6031cc | 304 | kss.ss_sp = (void __user *) (long) sp; |
1da177e4 LT |
305 | err |= __get_user(kss.ss_size, &uss->ss_size); |
306 | err |= __get_user(kss.ss_flags, &uss->ss_flags); | |
307 | if (err) | |
308 | return -EFAULT; | |
309 | } | |
310 | ||
311 | set_fs (KERNEL_DS); | |
9bbf28a3 AN |
312 | ret = do_sigaltstack(uss ? (stack_t __user *)&kss : NULL, |
313 | uoss ? (stack_t __user *)&koss : NULL, usp); | |
1da177e4 LT |
314 | set_fs (old_fs); |
315 | ||
316 | if (!ret && uoss) { | |
317 | if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) | |
318 | return -EFAULT; | |
9c6031cc | 319 | sp = (int) (unsigned long) koss.ss_sp; |
1da177e4 LT |
320 | err |= __put_user(sp, &uoss->ss_sp); |
321 | err |= __put_user(koss.ss_size, &uoss->ss_size); | |
322 | err |= __put_user(koss.ss_flags, &uoss->ss_flags); | |
323 | if (err) | |
324 | return -EFAULT; | |
325 | } | |
326 | return ret; | |
327 | } | |
328 | ||
9bbf28a3 | 329 | static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 __user *sc) |
1da177e4 | 330 | { |
e50c0a8f | 331 | u32 used_math; |
1da177e4 | 332 | int err = 0; |
e50c0a8f | 333 | s32 treg; |
1da177e4 LT |
334 | |
335 | /* Always make any pending restarted system calls return -EINTR */ | |
336 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
337 | ||
338 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
339 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
340 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
e50c0a8f RB |
341 | if (cpu_has_dsp) { |
342 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
343 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
344 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
345 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
346 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
347 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
348 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
349 | } | |
1da177e4 LT |
350 | |
351 | #define restore_gp_reg(i) do { \ | |
352 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \ | |
353 | } while(0) | |
354 | restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); | |
355 | restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); | |
356 | restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); | |
357 | restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); | |
358 | restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); | |
359 | restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); | |
360 | restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); | |
361 | restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); | |
362 | restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); | |
363 | restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); | |
364 | restore_gp_reg(31); | |
365 | #undef restore_gp_reg | |
366 | ||
367 | err |= __get_user(used_math, &sc->sc_used_math); | |
368 | conditional_used_math(used_math); | |
369 | ||
370 | preempt_disable(); | |
371 | ||
372 | if (used_math()) { | |
373 | /* restore fpu context if we have used it before */ | |
374 | own_fpu(); | |
375 | err |= restore_fp_context32(sc); | |
376 | } else { | |
377 | /* signal handler may have used FPU. Give it up. */ | |
378 | lose_fpu(); | |
379 | } | |
380 | ||
381 | preempt_enable(); | |
382 | ||
383 | return err; | |
384 | } | |
385 | ||
386 | struct sigframe { | |
387 | u32 sf_ass[4]; /* argument save space for o32 */ | |
02416dcf RB |
388 | #if ICACHE_REFILLS_WORKAROUND_WAR |
389 | u32 sf_pad[2]; | |
390 | #else | |
1da177e4 | 391 | u32 sf_code[2]; /* signal trampoline */ |
02416dcf | 392 | #endif |
1da177e4 LT |
393 | struct sigcontext32 sf_sc; |
394 | sigset_t sf_mask; | |
02416dcf RB |
395 | #if ICACHE_REFILLS_WORKAROUND_WAR |
396 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ | |
397 | #endif | |
1da177e4 LT |
398 | }; |
399 | ||
400 | struct rt_sigframe32 { | |
401 | u32 rs_ass[4]; /* argument save space for o32 */ | |
02416dcf RB |
402 | #if ICACHE_REFILLS_WORKAROUND_WAR |
403 | u32 rs_pad[2]; | |
404 | #else | |
1da177e4 | 405 | u32 rs_code[2]; /* signal trampoline */ |
02416dcf | 406 | #endif |
1da177e4 LT |
407 | compat_siginfo_t rs_info; |
408 | struct ucontext32 rs_uc; | |
02416dcf RB |
409 | #if ICACHE_REFILLS_WORKAROUND_WAR |
410 | u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */ | |
411 | #endif | |
1da177e4 LT |
412 | }; |
413 | ||
9bbf28a3 | 414 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) |
1da177e4 LT |
415 | { |
416 | int err; | |
417 | ||
418 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
419 | return -EFAULT; | |
420 | ||
421 | /* If you change siginfo_t structure, please be sure | |
422 | this code is fixed accordingly. | |
423 | It should never copy any pad contained in the structure | |
424 | to avoid security leaks, but must copy the generic | |
425 | 3 ints plus the relevant union member. | |
426 | This routine must convert siginfo from 64bit to 32bit as well | |
427 | at the same time. */ | |
428 | err = __put_user(from->si_signo, &to->si_signo); | |
429 | err |= __put_user(from->si_errno, &to->si_errno); | |
430 | err |= __put_user((short)from->si_code, &to->si_code); | |
431 | if (from->si_code < 0) | |
432 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
433 | else { | |
434 | switch (from->si_code >> 16) { | |
a982099c RB |
435 | case __SI_TIMER >> 16: |
436 | err |= __put_user(from->si_tid, &to->si_tid); | |
437 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
438 | err |= __put_user(from->si_int, &to->si_int); | |
439 | break; | |
1da177e4 LT |
440 | case __SI_CHLD >> 16: |
441 | err |= __put_user(from->si_utime, &to->si_utime); | |
442 | err |= __put_user(from->si_stime, &to->si_stime); | |
443 | err |= __put_user(from->si_status, &to->si_status); | |
444 | default: | |
445 | err |= __put_user(from->si_pid, &to->si_pid); | |
446 | err |= __put_user(from->si_uid, &to->si_uid); | |
447 | break; | |
448 | case __SI_FAULT >> 16: | |
5665a0ac | 449 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); |
1da177e4 LT |
450 | break; |
451 | case __SI_POLL >> 16: | |
452 | err |= __put_user(from->si_band, &to->si_band); | |
453 | err |= __put_user(from->si_fd, &to->si_fd); | |
454 | break; | |
455 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
456 | case __SI_MESGQ >> 16: | |
457 | err |= __put_user(from->si_pid, &to->si_pid); | |
458 | err |= __put_user(from->si_uid, &to->si_uid); | |
459 | err |= __put_user(from->si_int, &to->si_int); | |
460 | break; | |
461 | } | |
462 | } | |
463 | return err; | |
464 | } | |
465 | ||
466 | save_static_function(sys32_sigreturn); | |
467 | __attribute_used__ noinline static void | |
468 | _sys32_sigreturn(nabi_no_regargs struct pt_regs regs) | |
469 | { | |
9bbf28a3 | 470 | struct sigframe __user *frame; |
1da177e4 LT |
471 | sigset_t blocked; |
472 | ||
9bbf28a3 | 473 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
474 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
475 | goto badframe; | |
476 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
477 | goto badframe; | |
478 | ||
479 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
480 | spin_lock_irq(¤t->sighand->siglock); | |
481 | current->blocked = blocked; | |
482 | recalc_sigpending(); | |
483 | spin_unlock_irq(¤t->sighand->siglock); | |
484 | ||
485 | if (restore_sigcontext32(®s, &frame->sf_sc)) | |
486 | goto badframe; | |
487 | ||
488 | /* | |
489 | * Don't let your children do this ... | |
490 | */ | |
1da177e4 LT |
491 | __asm__ __volatile__( |
492 | "move\t$29, %0\n\t" | |
493 | "j\tsyscall_exit" | |
494 | :/* no outputs */ | |
495 | :"r" (®s)); | |
496 | /* Unreached */ | |
497 | ||
498 | badframe: | |
499 | force_sig(SIGSEGV, current); | |
500 | } | |
501 | ||
502 | save_static_function(sys32_rt_sigreturn); | |
503 | __attribute_used__ noinline static void | |
504 | _sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) | |
505 | { | |
9bbf28a3 | 506 | struct rt_sigframe32 __user *frame; |
1fcf1cc7 | 507 | mm_segment_t old_fs; |
1da177e4 LT |
508 | sigset_t set; |
509 | stack_t st; | |
510 | s32 sp; | |
511 | ||
9bbf28a3 | 512 | frame = (struct rt_sigframe32 __user *) regs.regs[29]; |
1da177e4 LT |
513 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
514 | goto badframe; | |
515 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
516 | goto badframe; | |
517 | ||
518 | sigdelsetmask(&set, ~_BLOCKABLE); | |
519 | spin_lock_irq(¤t->sighand->siglock); | |
520 | current->blocked = set; | |
521 | recalc_sigpending(); | |
522 | spin_unlock_irq(¤t->sighand->siglock); | |
523 | ||
524 | if (restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext)) | |
525 | goto badframe; | |
526 | ||
527 | /* The ucontext contains a stack32_t, so we must convert! */ | |
528 | if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) | |
529 | goto badframe; | |
9c6031cc | 530 | st.ss_sp = (void __user *)(long) sp; |
1da177e4 LT |
531 | if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) |
532 | goto badframe; | |
533 | if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) | |
534 | goto badframe; | |
535 | ||
536 | /* It is more difficult to avoid calling this function than to | |
537 | call it and ignore errors. */ | |
1fcf1cc7 RB |
538 | old_fs = get_fs(); |
539 | set_fs (KERNEL_DS); | |
9bbf28a3 | 540 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
1fcf1cc7 | 541 | set_fs (old_fs); |
1da177e4 LT |
542 | |
543 | /* | |
544 | * Don't let your children do this ... | |
545 | */ | |
546 | __asm__ __volatile__( | |
547 | "move\t$29, %0\n\t" | |
548 | "j\tsyscall_exit" | |
549 | :/* no outputs */ | |
550 | :"r" (®s)); | |
551 | /* Unreached */ | |
552 | ||
553 | badframe: | |
554 | force_sig(SIGSEGV, current); | |
555 | } | |
556 | ||
557 | static inline int setup_sigcontext32(struct pt_regs *regs, | |
9bbf28a3 | 558 | struct sigcontext32 __user *sc) |
1da177e4 LT |
559 | { |
560 | int err = 0; | |
561 | ||
562 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
563 | err |= __put_user(regs->cp0_status, &sc->sc_status); | |
564 | ||
565 | #define save_gp_reg(i) { \ | |
566 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \ | |
567 | } while(0) | |
568 | __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); | |
569 | save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); | |
570 | save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); | |
571 | save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); | |
572 | save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); | |
573 | save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); | |
574 | save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); | |
575 | save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); | |
576 | save_gp_reg(31); | |
577 | #undef save_gp_reg | |
578 | ||
579 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
580 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
e50c0a8f | 581 | if (cpu_has_dsp) { |
c4fa6348 | 582 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); |
e50c0a8f RB |
583 | err |= __put_user(mfhi1(), &sc->sc_hi1); |
584 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
585 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
586 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
587 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
588 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
589 | } | |
1da177e4 LT |
590 | |
591 | err |= __put_user(!!used_math(), &sc->sc_used_math); | |
592 | ||
593 | if (!used_math()) | |
594 | goto out; | |
595 | ||
42a3b4f2 | 596 | /* |
1da177e4 LT |
597 | * Save FPU state to signal context. Signal handler will "inherit" |
598 | * current FPU state. | |
599 | */ | |
600 | preempt_disable(); | |
601 | ||
602 | if (!is_fpu_owner()) { | |
603 | own_fpu(); | |
604 | restore_fp(current); | |
605 | } | |
606 | err |= save_fp_context32(sc); | |
607 | ||
608 | preempt_enable(); | |
609 | ||
610 | out: | |
611 | return err; | |
612 | } | |
613 | ||
614 | /* | |
615 | * Determine which stack to use.. | |
616 | */ | |
9bbf28a3 AN |
617 | static inline void __user *get_sigframe(struct k_sigaction *ka, |
618 | struct pt_regs *regs, | |
619 | size_t frame_size) | |
1da177e4 LT |
620 | { |
621 | unsigned long sp; | |
622 | ||
623 | /* Default to using normal stack */ | |
624 | sp = regs->regs[29]; | |
625 | ||
626 | /* | |
a3dddd56 RB |
627 | * FPU emulator may have it's own trampoline active just |
628 | * above the user stack, 16-bytes before the next lowest | |
629 | * 16 byte boundary. Try to avoid trashing it. | |
630 | */ | |
631 | sp -= 32; | |
1da177e4 LT |
632 | |
633 | /* This is the X/Open sanctioned signal stack switching. */ | |
634 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
635 | sp = current->sas_ss_sp + current->sas_ss_size; | |
636 | ||
9bbf28a3 | 637 | return (void __user *)((sp - frame_size) & ALMASK); |
1da177e4 LT |
638 | } |
639 | ||
16cd3951 AN |
640 | int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, |
641 | int signr, sigset_t *set) | |
1da177e4 | 642 | { |
9bbf28a3 | 643 | struct sigframe __user *frame; |
1da177e4 LT |
644 | int err = 0; |
645 | ||
646 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
647 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
648 | goto give_sigsegv; | |
649 | ||
650 | /* | |
651 | * Set up the return code ... | |
652 | * | |
653 | * li v0, __NR_O32_sigreturn | |
654 | * syscall | |
655 | */ | |
656 | err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0); | |
657 | err |= __put_user(0x0000000c , frame->sf_code + 1); | |
658 | flush_cache_sigtramp((unsigned long) frame->sf_code); | |
659 | ||
660 | err |= setup_sigcontext32(regs, &frame->sf_sc); | |
661 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
662 | if (err) | |
663 | goto give_sigsegv; | |
664 | ||
665 | /* | |
666 | * Arguments to signal handler: | |
667 | * | |
668 | * a0 = signal number | |
669 | * a1 = 0 (should be cause) | |
670 | * a2 = pointer to struct sigcontext | |
671 | * | |
672 | * $25 and c0_epc point to the signal handler, $29 points to the | |
673 | * struct sigframe. | |
674 | */ | |
675 | regs->regs[ 4] = signr; | |
676 | regs->regs[ 5] = 0; | |
677 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
678 | regs->regs[29] = (unsigned long) frame; | |
679 | regs->regs[31] = (unsigned long) frame->sf_code; | |
680 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
681 | ||
682 | #if DEBUG_SIG | |
683 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
684 | current->comm, current->pid, | |
685 | frame, regs->cp0_epc, frame->sf_code); | |
686 | #endif | |
7b3e2fc8 | 687 | return 0; |
1da177e4 LT |
688 | |
689 | give_sigsegv: | |
690 | force_sigsegv(signr, current); | |
7b3e2fc8 | 691 | return -EFAULT; |
1da177e4 LT |
692 | } |
693 | ||
16cd3951 AN |
694 | int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, |
695 | int signr, sigset_t *set, siginfo_t *info) | |
1da177e4 | 696 | { |
9bbf28a3 | 697 | struct rt_sigframe32 __user *frame; |
1da177e4 LT |
698 | int err = 0; |
699 | s32 sp; | |
700 | ||
701 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
702 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
703 | goto give_sigsegv; | |
704 | ||
705 | /* Set up to return from userspace. If provided, use a stub already | |
706 | in userspace. */ | |
707 | /* | |
708 | * Set up the return code ... | |
709 | * | |
710 | * li v0, __NR_O32_rt_sigreturn | |
711 | * syscall | |
712 | */ | |
713 | err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0); | |
714 | err |= __put_user(0x0000000c , frame->rs_code + 1); | |
715 | flush_cache_sigtramp((unsigned long) frame->rs_code); | |
716 | ||
717 | /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ | |
718 | err |= copy_siginfo_to_user32(&frame->rs_info, info); | |
719 | ||
720 | /* Create the ucontext. */ | |
721 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
722 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
723 | sp = (int) (long) current->sas_ss_sp; | |
724 | err |= __put_user(sp, | |
725 | &frame->rs_uc.uc_stack.ss_sp); | |
726 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
727 | &frame->rs_uc.uc_stack.ss_flags); | |
728 | err |= __put_user(current->sas_ss_size, | |
729 | &frame->rs_uc.uc_stack.ss_size); | |
730 | err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); | |
731 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
732 | ||
733 | if (err) | |
734 | goto give_sigsegv; | |
735 | ||
736 | /* | |
737 | * Arguments to signal handler: | |
738 | * | |
739 | * a0 = signal number | |
740 | * a1 = 0 (should be cause) | |
741 | * a2 = pointer to ucontext | |
742 | * | |
743 | * $25 and c0_epc point to the signal handler, $29 points to | |
744 | * the struct rt_sigframe32. | |
745 | */ | |
746 | regs->regs[ 4] = signr; | |
747 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
748 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
749 | regs->regs[29] = (unsigned long) frame; | |
750 | regs->regs[31] = (unsigned long) frame->rs_code; | |
751 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
752 | ||
753 | #if DEBUG_SIG | |
754 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
755 | current->comm, current->pid, | |
756 | frame, regs->cp0_epc, frame->rs_code); | |
757 | #endif | |
7b3e2fc8 | 758 | return 0; |
1da177e4 LT |
759 | |
760 | give_sigsegv: | |
761 | force_sigsegv(signr, current); | |
7b3e2fc8 | 762 | return -EFAULT; |
1da177e4 LT |
763 | } |
764 | ||
129bc8f7 | 765 | static inline int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
766 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs) |
767 | { | |
129bc8f7 RB |
768 | int ret; |
769 | ||
1da177e4 LT |
770 | switch (regs->regs[0]) { |
771 | case ERESTART_RESTARTBLOCK: | |
772 | case ERESTARTNOHAND: | |
773 | regs->regs[2] = EINTR; | |
774 | break; | |
775 | case ERESTARTSYS: | |
68fa383f | 776 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
1da177e4 LT |
777 | regs->regs[2] = EINTR; |
778 | break; | |
779 | } | |
780 | /* fallthrough */ | |
781 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
782 | regs->regs[7] = regs->regs[26]; | |
783 | regs->cp0_epc -= 8; | |
784 | } | |
785 | ||
786 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
787 | ||
788 | if (ka->sa.sa_flags & SA_SIGINFO) | |
129bc8f7 | 789 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
1da177e4 | 790 | else |
129bc8f7 | 791 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
1da177e4 | 792 | |
69be8f18 SR |
793 | spin_lock_irq(¤t->sighand->siglock); |
794 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
795 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 796 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
797 | recalc_sigpending(); |
798 | spin_unlock_irq(¤t->sighand->siglock); | |
129bc8f7 RB |
799 | |
800 | return ret; | |
1da177e4 LT |
801 | } |
802 | ||
dda73d0b | 803 | void do_signal32(struct pt_regs *regs) |
1da177e4 LT |
804 | { |
805 | struct k_sigaction ka; | |
68fa383f | 806 | sigset_t *oldset; |
1da177e4 LT |
807 | siginfo_t info; |
808 | int signr; | |
809 | ||
810 | /* | |
811 | * We want the common case to go fast, which is why we may in certain | |
812 | * cases get here from kernel mode. Just return without doing anything | |
813 | * if so. | |
814 | */ | |
815 | if (!user_mode(regs)) | |
dda73d0b | 816 | return; |
1da177e4 | 817 | |
0e6c1f5f | 818 | if (try_to_freeze()) |
1da177e4 LT |
819 | goto no_signal; |
820 | ||
68fa383f MM |
821 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
822 | oldset = ¤t->saved_sigmask; | |
823 | else | |
1da177e4 LT |
824 | oldset = ¤t->blocked; |
825 | ||
826 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
68fa383f MM |
827 | if (signr > 0) { |
828 | /* Whee! Actually deliver the signal. */ | |
829 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
830 | /* | |
831 | * A signal was successfully delivered; the saved | |
832 | * sigmask will have been stored in the signal frame, | |
833 | * and will be restored by sigreturn, so we can simply | |
834 | * clear the TIF_RESTORE_SIGMASK flag. | |
835 | */ | |
836 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
837 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
838 | } | |
839 | } | |
1da177e4 LT |
840 | |
841 | no_signal: | |
842 | /* | |
843 | * Who's code doesn't conform to the restartable syscall convention | |
844 | * dies here!!! The li instruction, a single machine instruction, | |
845 | * must directly be followed by the syscall instruction. | |
846 | */ | |
847 | if (regs->regs[0]) { | |
848 | if (regs->regs[2] == ERESTARTNOHAND || | |
849 | regs->regs[2] == ERESTARTSYS || | |
850 | regs->regs[2] == ERESTARTNOINTR) { | |
851 | regs->regs[7] = regs->regs[26]; | |
852 | regs->cp0_epc -= 8; | |
853 | } | |
854 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
855 | regs->regs[2] = __NR_O32_restart_syscall; | |
856 | regs->regs[7] = regs->regs[26]; | |
857 | regs->cp0_epc -= 4; | |
858 | } | |
859 | } | |
68fa383f MM |
860 | |
861 | /* | |
862 | * If there's no signal to deliver, we just put the saved sigmask | |
863 | * back | |
864 | */ | |
865 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
866 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
867 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
868 | } | |
1da177e4 LT |
869 | } |
870 | ||
9c6031cc | 871 | asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, |
9bbf28a3 | 872 | struct sigaction32 __user *oact, |
1da177e4 LT |
873 | unsigned int sigsetsize) |
874 | { | |
875 | struct k_sigaction new_sa, old_sa; | |
876 | int ret = -EINVAL; | |
877 | ||
878 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
879 | if (sigsetsize != sizeof(sigset_t)) | |
880 | goto out; | |
881 | ||
882 | if (act) { | |
77c728c2 | 883 | s32 handler; |
1da177e4 LT |
884 | int err = 0; |
885 | ||
886 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
887 | return -EFAULT; | |
77c728c2 | 888 | err |= __get_user(handler, &act->sa_handler); |
9bbf28a3 | 889 | new_sa.sa.sa_handler = (void __user *)(s64)handler; |
1da177e4 LT |
890 | err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags); |
891 | err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask); | |
892 | if (err) | |
893 | return -EFAULT; | |
894 | } | |
895 | ||
896 | ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); | |
897 | ||
898 | if (!ret && oact) { | |
899 | int err = 0; | |
900 | ||
901 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
902 | return -EFAULT; | |
903 | ||
904 | err |= __put_user((u32)(u64)old_sa.sa.sa_handler, | |
905 | &oact->sa_handler); | |
906 | err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags); | |
907 | err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask); | |
908 | if (err) | |
909 | return -EFAULT; | |
910 | } | |
911 | out: | |
912 | return ret; | |
913 | } | |
914 | ||
9c6031cc | 915 | asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, |
9bbf28a3 | 916 | compat_sigset_t __user *oset, unsigned int sigsetsize) |
1da177e4 LT |
917 | { |
918 | sigset_t old_set, new_set; | |
919 | int ret; | |
920 | mm_segment_t old_fs = get_fs(); | |
921 | ||
922 | if (set && get_sigset(&new_set, set)) | |
923 | return -EFAULT; | |
924 | ||
925 | set_fs (KERNEL_DS); | |
9bbf28a3 AN |
926 | ret = sys_rt_sigprocmask(how, set ? (sigset_t __user *)&new_set : NULL, |
927 | oset ? (sigset_t __user *)&old_set : NULL, | |
928 | sigsetsize); | |
1da177e4 LT |
929 | set_fs (old_fs); |
930 | ||
931 | if (!ret && oset && put_sigset(&old_set, oset)) | |
932 | return -EFAULT; | |
933 | ||
934 | return ret; | |
935 | } | |
936 | ||
9bbf28a3 | 937 | asmlinkage int sys32_rt_sigpending(compat_sigset_t __user *uset, |
1da177e4 LT |
938 | unsigned int sigsetsize) |
939 | { | |
940 | int ret; | |
941 | sigset_t set; | |
942 | mm_segment_t old_fs = get_fs(); | |
943 | ||
944 | set_fs (KERNEL_DS); | |
9bbf28a3 | 945 | ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize); |
1da177e4 LT |
946 | set_fs (old_fs); |
947 | ||
948 | if (!ret && put_sigset(&set, uset)) | |
949 | return -EFAULT; | |
950 | ||
951 | return ret; | |
952 | } | |
953 | ||
9bbf28a3 | 954 | asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
955 | { |
956 | siginfo_t info; | |
957 | int ret; | |
958 | mm_segment_t old_fs = get_fs(); | |
959 | ||
960 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || | |
961 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE)) | |
962 | return -EFAULT; | |
963 | set_fs (KERNEL_DS); | |
9bbf28a3 | 964 | ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info); |
1da177e4 LT |
965 | set_fs (old_fs); |
966 | return ret; | |
967 | } | |
54f2da75 RB |
968 | |
969 | asmlinkage long | |
970 | sys32_waitid(int which, compat_pid_t pid, | |
971 | compat_siginfo_t __user *uinfo, int options, | |
972 | struct compat_rusage __user *uru) | |
973 | { | |
974 | siginfo_t info; | |
975 | struct rusage ru; | |
976 | long ret; | |
977 | mm_segment_t old_fs = get_fs(); | |
978 | ||
979 | info.si_signo = 0; | |
980 | set_fs (KERNEL_DS); | |
981 | ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options, | |
982 | uru ? (struct rusage __user *) &ru : NULL); | |
983 | set_fs (old_fs); | |
984 | ||
985 | if (ret < 0 || info.si_signo == 0) | |
986 | return ret; | |
987 | ||
988 | if (uru && (ret = put_compat_rusage(&ru, uru))) | |
989 | return ret; | |
990 | ||
991 | BUG_ON(info.si_code & __SI_MASK); | |
992 | info.si_code |= __SI_CHLD; | |
993 | return copy_siginfo_to_user32(uinfo, &info); | |
994 | } |