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> |
431dc804 | 11 | #include <linux/compat.h> |
1da177e4 LT |
12 | #include <linux/sched.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/smp.h> | |
1da177e4 LT |
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> | |
1da177e4 LT |
21 | #include <linux/suspend.h> |
22 | #include <linux/compiler.h> | |
faea6234 | 23 | #include <linux/uaccess.h> |
1da177e4 | 24 | |
e50c0a8f | 25 | #include <asm/abi.h> |
1da177e4 | 26 | #include <asm/asm.h> |
431dc804 | 27 | #include <asm/compat-signal.h> |
1da177e4 LT |
28 | #include <linux/bitops.h> |
29 | #include <asm/cacheflush.h> | |
30 | #include <asm/sim.h> | |
1da177e4 LT |
31 | #include <asm/ucontext.h> |
32 | #include <asm/system.h> | |
33 | #include <asm/fpu.h> | |
02416dcf | 34 | #include <asm/war.h> |
1da177e4 | 35 | |
36a1f2c2 FBH |
36 | #include "signal-common.h" |
37 | ||
137f6f3e RB |
38 | static int (*save_fp_context32)(struct sigcontext32 __user *sc); |
39 | static int (*restore_fp_context32)(struct sigcontext32 __user *sc); | |
40 | ||
41 | extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc); | |
42 | extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc); | |
43 | ||
44 | extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc); | |
45 | extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc); | |
46 | ||
1da177e4 LT |
47 | /* |
48 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
49 | */ | |
50 | #define __NR_O32_sigreturn 4119 | |
51 | #define __NR_O32_rt_sigreturn 4193 | |
151fd6ac | 52 | #define __NR_O32_restart_syscall 4253 |
1da177e4 | 53 | |
1da177e4 LT |
54 | /* 32-bit compatibility types */ |
55 | ||
1da177e4 LT |
56 | typedef unsigned int __sighandler32_t; |
57 | typedef void (*vfptr_t)(void); | |
58 | ||
59 | struct sigaction32 { | |
60 | unsigned int sa_flags; | |
61 | __sighandler32_t sa_handler; | |
62 | compat_sigset_t sa_mask; | |
63 | }; | |
64 | ||
65 | /* IRIX compatible stack_t */ | |
66 | typedef struct sigaltstack32 { | |
67 | s32 ss_sp; | |
68 | compat_size_t ss_size; | |
69 | int ss_flags; | |
70 | } stack32_t; | |
71 | ||
72 | struct ucontext32 { | |
73 | u32 uc_flags; | |
74 | s32 uc_link; | |
75 | stack32_t uc_stack; | |
76 | struct sigcontext32 uc_mcontext; | |
01ee6037 | 77 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
1da177e4 LT |
78 | }; |
79 | ||
dd02f06a RB |
80 | /* |
81 | * Horribly complicated - with the bloody RM9000 workarounds enabled | |
82 | * the signal trampolines is moving to the end of the structure so we can | |
83 | * increase the alignment without breaking software compatibility. | |
84 | */ | |
c0b9bae9 FBH |
85 | #if ICACHE_REFILLS_WORKAROUND_WAR == 0 |
86 | ||
dd02f06a RB |
87 | struct sigframe32 { |
88 | u32 sf_ass[4]; /* argument save space for o32 */ | |
89 | u32 sf_code[2]; /* signal trampoline */ | |
90 | struct sigcontext32 sf_sc; | |
755f21bb | 91 | compat_sigset_t sf_mask; |
dd02f06a RB |
92 | }; |
93 | ||
c0b9bae9 FBH |
94 | struct rt_sigframe32 { |
95 | u32 rs_ass[4]; /* argument save space for o32 */ | |
96 | u32 rs_code[2]; /* signal trampoline */ | |
97 | compat_siginfo_t rs_info; | |
98 | struct ucontext32 rs_uc; | |
99 | }; | |
100 | ||
101 | #else /* ICACHE_REFILLS_WORKAROUND_WAR */ | |
102 | ||
dd02f06a RB |
103 | struct sigframe32 { |
104 | u32 sf_ass[4]; /* argument save space for o32 */ | |
105 | u32 sf_pad[2]; | |
106 | struct sigcontext32 sf_sc; /* hw context */ | |
755f21bb | 107 | compat_sigset_t sf_mask; |
dd02f06a RB |
108 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ |
109 | }; | |
110 | ||
c0b9bae9 FBH |
111 | struct rt_sigframe32 { |
112 | u32 rs_ass[4]; /* argument save space for o32 */ | |
113 | u32 rs_pad[2]; | |
114 | compat_siginfo_t rs_info; | |
115 | struct ucontext32 rs_uc; | |
116 | u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */ | |
117 | }; | |
118 | ||
119 | #endif /* !ICACHE_REFILLS_WORKAROUND_WAR */ | |
120 | ||
9432a9ba FBH |
121 | /* |
122 | * sigcontext handlers | |
123 | */ | |
faea6234 AN |
124 | static int protected_save_fp_context32(struct sigcontext32 __user *sc) |
125 | { | |
126 | int err; | |
127 | while (1) { | |
128 | lock_fpu_owner(); | |
129 | own_fpu_inatomic(1); | |
130 | err = save_fp_context32(sc); /* this might fail */ | |
131 | unlock_fpu_owner(); | |
132 | if (likely(!err)) | |
133 | break; | |
134 | /* touch the sigcontext and try again */ | |
135 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
136 | __put_user(0, &sc->sc_fpregs[31]) | | |
137 | __put_user(0, &sc->sc_fpc_csr); | |
138 | if (err) | |
139 | break; /* really bad sigcontext */ | |
140 | } | |
141 | return err; | |
142 | } | |
143 | ||
144 | static int protected_restore_fp_context32(struct sigcontext32 __user *sc) | |
145 | { | |
146 | int err, tmp; | |
147 | while (1) { | |
148 | lock_fpu_owner(); | |
149 | own_fpu_inatomic(0); | |
150 | err = restore_fp_context32(sc); /* this might fail */ | |
151 | unlock_fpu_owner(); | |
152 | if (likely(!err)) | |
153 | break; | |
154 | /* touch the sigcontext and try again */ | |
155 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
156 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
157 | __get_user(tmp, &sc->sc_fpc_csr); | |
158 | if (err) | |
159 | break; /* really bad sigcontext */ | |
160 | } | |
161 | return err; | |
162 | } | |
163 | ||
9432a9ba FBH |
164 | static int setup_sigcontext32(struct pt_regs *regs, |
165 | struct sigcontext32 __user *sc) | |
166 | { | |
167 | int err = 0; | |
168 | int i; | |
53dc8028 | 169 | u32 used_math; |
9432a9ba FBH |
170 | |
171 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
9432a9ba FBH |
172 | |
173 | err |= __put_user(0, &sc->sc_regs[0]); | |
174 | for (i = 1; i < 32; i++) | |
175 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
176 | ||
177 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
178 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
179 | if (cpu_has_dsp) { | |
180 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
181 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
182 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
183 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
184 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
185 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
186 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
187 | } | |
188 | ||
53dc8028 AN |
189 | used_math = !!used_math(); |
190 | err |= __put_user(used_math, &sc->sc_used_math); | |
9432a9ba | 191 | |
53dc8028 | 192 | if (used_math) { |
9432a9ba FBH |
193 | /* |
194 | * Save FPU state to signal context. Signal handler | |
195 | * will "inherit" current FPU state. | |
196 | */ | |
faea6234 | 197 | err |= protected_save_fp_context32(sc); |
9432a9ba FBH |
198 | } |
199 | return err; | |
200 | } | |
201 | ||
c6a2f467 AN |
202 | static int |
203 | check_and_restore_fp_context32(struct sigcontext32 __user *sc) | |
204 | { | |
205 | int err, sig; | |
206 | ||
207 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
208 | if (err > 0) | |
209 | err = 0; | |
faea6234 | 210 | err |= protected_restore_fp_context32(sc); |
c6a2f467 AN |
211 | return err ?: sig; |
212 | } | |
213 | ||
9432a9ba FBH |
214 | static int restore_sigcontext32(struct pt_regs *regs, |
215 | struct sigcontext32 __user *sc) | |
216 | { | |
217 | u32 used_math; | |
218 | int err = 0; | |
219 | s32 treg; | |
220 | int i; | |
221 | ||
222 | /* Always make any pending restarted system calls return -EINTR */ | |
223 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
224 | ||
225 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
226 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
227 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
228 | if (cpu_has_dsp) { | |
229 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
230 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
231 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
232 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
233 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
234 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
235 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
236 | } | |
237 | ||
238 | for (i = 1; i < 32; i++) | |
239 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
240 | ||
241 | err |= __get_user(used_math, &sc->sc_used_math); | |
242 | conditional_used_math(used_math); | |
243 | ||
53dc8028 | 244 | if (used_math) { |
9432a9ba | 245 | /* restore fpu context if we have used it before */ |
c6a2f467 AN |
246 | if (!err) |
247 | err = check_and_restore_fp_context32(sc); | |
9432a9ba FBH |
248 | } else { |
249 | /* signal handler may have used FPU. Give it up. */ | |
53dc8028 | 250 | lose_fpu(0); |
9432a9ba FBH |
251 | } |
252 | ||
9432a9ba FBH |
253 | return err; |
254 | } | |
255 | ||
256 | /* | |
257 | * | |
258 | */ | |
1da177e4 LT |
259 | extern void __put_sigset_unknown_nsig(void); |
260 | extern void __get_sigset_unknown_nsig(void); | |
261 | ||
9bbf28a3 | 262 | static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf) |
1da177e4 LT |
263 | { |
264 | int err = 0; | |
265 | ||
266 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf))) | |
267 | return -EFAULT; | |
268 | ||
269 | switch (_NSIG_WORDS) { | |
270 | default: | |
271 | __put_sigset_unknown_nsig(); | |
272 | case 2: | |
49a89efb RB |
273 | err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]); |
274 | err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]); | |
1da177e4 | 275 | case 1: |
49a89efb RB |
276 | err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]); |
277 | err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]); | |
1da177e4 LT |
278 | } |
279 | ||
280 | return err; | |
281 | } | |
282 | ||
9c6031cc | 283 | static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf) |
1da177e4 LT |
284 | { |
285 | int err = 0; | |
286 | unsigned long sig[4]; | |
287 | ||
288 | if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf))) | |
289 | return -EFAULT; | |
290 | ||
291 | switch (_NSIG_WORDS) { | |
292 | default: | |
293 | __get_sigset_unknown_nsig(); | |
294 | case 2: | |
49a89efb RB |
295 | err |= __get_user(sig[3], &ubuf->sig[3]); |
296 | err |= __get_user(sig[2], &ubuf->sig[2]); | |
1da177e4 LT |
297 | kbuf->sig[1] = sig[2] | (sig[3] << 32); |
298 | case 1: | |
49a89efb RB |
299 | err |= __get_user(sig[1], &ubuf->sig[1]); |
300 | err |= __get_user(sig[0], &ubuf->sig[0]); | |
1da177e4 LT |
301 | kbuf->sig[0] = sig[0] | (sig[1] << 32); |
302 | } | |
303 | ||
304 | return err; | |
305 | } | |
306 | ||
307 | /* | |
308 | * Atomically swap in the new signal mask, and wait for a signal. | |
309 | */ | |
310 | ||
f90080a0 | 311 | asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 312 | { |
9c6031cc | 313 | compat_sigset_t __user *uset; |
68fa383f | 314 | sigset_t newset; |
1da177e4 | 315 | |
9c6031cc | 316 | uset = (compat_sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
317 | if (get_sigset(&newset, uset)) |
318 | return -EFAULT; | |
319 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
320 | ||
321 | spin_lock_irq(¤t->sighand->siglock); | |
68fa383f | 322 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
323 | current->blocked = newset; |
324 | recalc_sigpending(); | |
325 | spin_unlock_irq(¤t->sighand->siglock); | |
326 | ||
68fa383f MM |
327 | current->state = TASK_INTERRUPTIBLE; |
328 | schedule(); | |
329 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
330 | return -ERESTARTNOHAND; | |
1da177e4 LT |
331 | } |
332 | ||
f90080a0 | 333 | asmlinkage int sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 334 | { |
9c6031cc | 335 | compat_sigset_t __user *uset; |
68fa383f | 336 | sigset_t newset; |
304416da | 337 | size_t sigsetsize; |
1da177e4 LT |
338 | |
339 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
340 | sigsetsize = regs.regs[5]; | |
341 | if (sigsetsize != sizeof(compat_sigset_t)) | |
342 | return -EINVAL; | |
343 | ||
9c6031cc | 344 | uset = (compat_sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
345 | if (get_sigset(&newset, uset)) |
346 | return -EFAULT; | |
347 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
348 | ||
349 | spin_lock_irq(¤t->sighand->siglock); | |
68fa383f | 350 | current->saved_sigmask = current->blocked; |
1da177e4 | 351 | current->blocked = newset; |
6254944f | 352 | recalc_sigpending(); |
1da177e4 LT |
353 | spin_unlock_irq(¤t->sighand->siglock); |
354 | ||
68fa383f MM |
355 | current->state = TASK_INTERRUPTIBLE; |
356 | schedule(); | |
357 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
358 | return -ERESTARTNOHAND; | |
1da177e4 LT |
359 | } |
360 | ||
dbda6ac0 RB |
361 | SYSCALL_DEFINE3(32_sigaction, long, sig, const struct sigaction32 __user *, act, |
362 | struct sigaction32 __user *, oact) | |
1da177e4 LT |
363 | { |
364 | struct k_sigaction new_ka, old_ka; | |
365 | int ret; | |
366 | int err = 0; | |
367 | ||
368 | if (act) { | |
369 | old_sigset_t mask; | |
77c728c2 | 370 | s32 handler; |
1da177e4 LT |
371 | |
372 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
373 | return -EFAULT; | |
77c728c2 | 374 | err |= __get_user(handler, &act->sa_handler); |
9bbf28a3 | 375 | new_ka.sa.sa_handler = (void __user *)(s64)handler; |
1da177e4 LT |
376 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
377 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
378 | if (err) | |
379 | return -EFAULT; | |
380 | ||
381 | siginitset(&new_ka.sa.sa_mask, mask); | |
382 | } | |
383 | ||
384 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
385 | ||
386 | if (!ret && oact) { | |
387 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
6254944f | 388 | return -EFAULT; |
1da177e4 LT |
389 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
390 | err |= __put_user((u32)(u64)old_ka.sa.sa_handler, | |
391 | &oact->sa_handler); | |
392 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
6254944f MM |
393 | err |= __put_user(0, &oact->sa_mask.sig[1]); |
394 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
395 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
396 | if (err) | |
1da177e4 LT |
397 | return -EFAULT; |
398 | } | |
399 | ||
400 | return ret; | |
401 | } | |
402 | ||
403 | asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
404 | { | |
9bbf28a3 AN |
405 | const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4]; |
406 | stack32_t __user *uoss = (stack32_t __user *) regs.regs[5]; | |
1da177e4 LT |
407 | unsigned long usp = regs.regs[29]; |
408 | stack_t kss, koss; | |
409 | int ret, err = 0; | |
410 | mm_segment_t old_fs = get_fs(); | |
411 | s32 sp; | |
412 | ||
413 | if (uss) { | |
414 | if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) | |
415 | return -EFAULT; | |
416 | err |= __get_user(sp, &uss->ss_sp); | |
9c6031cc | 417 | kss.ss_sp = (void __user *) (long) sp; |
1da177e4 LT |
418 | err |= __get_user(kss.ss_size, &uss->ss_size); |
419 | err |= __get_user(kss.ss_flags, &uss->ss_flags); | |
420 | if (err) | |
421 | return -EFAULT; | |
422 | } | |
423 | ||
49a89efb | 424 | set_fs(KERNEL_DS); |
9bbf28a3 AN |
425 | ret = do_sigaltstack(uss ? (stack_t __user *)&kss : NULL, |
426 | uoss ? (stack_t __user *)&koss : NULL, usp); | |
49a89efb | 427 | set_fs(old_fs); |
1da177e4 LT |
428 | |
429 | if (!ret && uoss) { | |
430 | if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) | |
431 | return -EFAULT; | |
9c6031cc | 432 | sp = (int) (unsigned long) koss.ss_sp; |
1da177e4 LT |
433 | err |= __put_user(sp, &uoss->ss_sp); |
434 | err |= __put_user(koss.ss_size, &uoss->ss_size); | |
435 | err |= __put_user(koss.ss_flags, &uoss->ss_flags); | |
436 | if (err) | |
437 | return -EFAULT; | |
438 | } | |
439 | return ret; | |
440 | } | |
441 | ||
9bbf28a3 | 442 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) |
1da177e4 LT |
443 | { |
444 | int err; | |
445 | ||
446 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
447 | return -EFAULT; | |
448 | ||
449 | /* If you change siginfo_t structure, please be sure | |
450 | this code is fixed accordingly. | |
451 | It should never copy any pad contained in the structure | |
452 | to avoid security leaks, but must copy the generic | |
453 | 3 ints plus the relevant union member. | |
454 | This routine must convert siginfo from 64bit to 32bit as well | |
455 | at the same time. */ | |
456 | err = __put_user(from->si_signo, &to->si_signo); | |
457 | err |= __put_user(from->si_errno, &to->si_errno); | |
458 | err |= __put_user((short)from->si_code, &to->si_code); | |
459 | if (from->si_code < 0) | |
460 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
461 | else { | |
462 | switch (from->si_code >> 16) { | |
a982099c RB |
463 | case __SI_TIMER >> 16: |
464 | err |= __put_user(from->si_tid, &to->si_tid); | |
465 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
466 | err |= __put_user(from->si_int, &to->si_int); | |
467 | break; | |
1da177e4 LT |
468 | case __SI_CHLD >> 16: |
469 | err |= __put_user(from->si_utime, &to->si_utime); | |
470 | err |= __put_user(from->si_stime, &to->si_stime); | |
471 | err |= __put_user(from->si_status, &to->si_status); | |
472 | default: | |
473 | err |= __put_user(from->si_pid, &to->si_pid); | |
474 | err |= __put_user(from->si_uid, &to->si_uid); | |
475 | break; | |
476 | case __SI_FAULT >> 16: | |
5665a0ac | 477 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); |
1da177e4 LT |
478 | break; |
479 | case __SI_POLL >> 16: | |
480 | err |= __put_user(from->si_band, &to->si_band); | |
481 | err |= __put_user(from->si_fd, &to->si_fd); | |
482 | break; | |
483 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
484 | case __SI_MESGQ >> 16: | |
485 | err |= __put_user(from->si_pid, &to->si_pid); | |
486 | err |= __put_user(from->si_uid, &to->si_uid); | |
487 | err |= __put_user(from->si_int, &to->si_int); | |
488 | break; | |
489 | } | |
490 | } | |
491 | return err; | |
492 | } | |
493 | ||
5d9a76cd TB |
494 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
495 | { | |
496 | memset(to, 0, sizeof *to); | |
497 | ||
498 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
499 | copy_from_user(to->_sifields._pad, | |
500 | from->_sifields._pad, SI_PAD_SIZE32)) | |
501 | return -EFAULT; | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
f90080a0 | 506 | asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 507 | { |
dd02f06a | 508 | struct sigframe32 __user *frame; |
1da177e4 | 509 | sigset_t blocked; |
c6a2f467 | 510 | int sig; |
1da177e4 | 511 | |
dd02f06a | 512 | frame = (struct sigframe32 __user *) regs.regs[29]; |
1da177e4 LT |
513 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
514 | goto badframe; | |
431dc804 | 515 | if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask)) |
1da177e4 LT |
516 | goto badframe; |
517 | ||
518 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
519 | spin_lock_irq(¤t->sighand->siglock); | |
520 | current->blocked = blocked; | |
521 | recalc_sigpending(); | |
522 | spin_unlock_irq(¤t->sighand->siglock); | |
523 | ||
c6a2f467 AN |
524 | sig = restore_sigcontext32(®s, &frame->sf_sc); |
525 | if (sig < 0) | |
1da177e4 | 526 | goto badframe; |
c6a2f467 AN |
527 | else if (sig) |
528 | force_sig(sig, current); | |
1da177e4 LT |
529 | |
530 | /* | |
531 | * Don't let your children do this ... | |
532 | */ | |
1da177e4 LT |
533 | __asm__ __volatile__( |
534 | "move\t$29, %0\n\t" | |
535 | "j\tsyscall_exit" | |
536 | :/* no outputs */ | |
537 | :"r" (®s)); | |
538 | /* Unreached */ | |
539 | ||
540 | badframe: | |
541 | force_sig(SIGSEGV, current); | |
542 | } | |
543 | ||
f90080a0 | 544 | asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 545 | { |
9bbf28a3 | 546 | struct rt_sigframe32 __user *frame; |
1fcf1cc7 | 547 | mm_segment_t old_fs; |
1da177e4 LT |
548 | sigset_t set; |
549 | stack_t st; | |
550 | s32 sp; | |
c6a2f467 | 551 | int sig; |
1da177e4 | 552 | |
9bbf28a3 | 553 | frame = (struct rt_sigframe32 __user *) regs.regs[29]; |
1da177e4 LT |
554 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
555 | goto badframe; | |
431dc804 | 556 | if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) |
1da177e4 LT |
557 | goto badframe; |
558 | ||
559 | sigdelsetmask(&set, ~_BLOCKABLE); | |
560 | spin_lock_irq(¤t->sighand->siglock); | |
561 | current->blocked = set; | |
562 | recalc_sigpending(); | |
563 | spin_unlock_irq(¤t->sighand->siglock); | |
564 | ||
c6a2f467 AN |
565 | sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext); |
566 | if (sig < 0) | |
1da177e4 | 567 | goto badframe; |
c6a2f467 AN |
568 | else if (sig) |
569 | force_sig(sig, current); | |
1da177e4 LT |
570 | |
571 | /* The ucontext contains a stack32_t, so we must convert! */ | |
572 | if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) | |
573 | goto badframe; | |
9c6031cc | 574 | st.ss_sp = (void __user *)(long) sp; |
1da177e4 LT |
575 | if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) |
576 | goto badframe; | |
577 | if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) | |
578 | goto badframe; | |
579 | ||
580 | /* It is more difficult to avoid calling this function than to | |
581 | call it and ignore errors. */ | |
1fcf1cc7 | 582 | old_fs = get_fs(); |
49a89efb | 583 | set_fs(KERNEL_DS); |
9bbf28a3 | 584 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
49a89efb | 585 | set_fs(old_fs); |
1da177e4 LT |
586 | |
587 | /* | |
588 | * Don't let your children do this ... | |
589 | */ | |
590 | __asm__ __volatile__( | |
591 | "move\t$29, %0\n\t" | |
592 | "j\tsyscall_exit" | |
593 | :/* no outputs */ | |
594 | :"r" (®s)); | |
595 | /* Unreached */ | |
596 | ||
597 | badframe: | |
598 | force_sig(SIGSEGV, current); | |
599 | } | |
600 | ||
151fd6ac | 601 | static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs, |
16cd3951 | 602 | int signr, sigset_t *set) |
1da177e4 | 603 | { |
dd02f06a | 604 | struct sigframe32 __user *frame; |
1da177e4 LT |
605 | int err = 0; |
606 | ||
607 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
608 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
609 | goto give_sigsegv; | |
610 | ||
36a1f2c2 | 611 | err |= install_sigtramp(frame->sf_code, __NR_O32_sigreturn); |
1da177e4 LT |
612 | |
613 | err |= setup_sigcontext32(regs, &frame->sf_sc); | |
431dc804 RB |
614 | err |= __copy_conv_sigset_to_user(&frame->sf_mask, set); |
615 | ||
1da177e4 LT |
616 | if (err) |
617 | goto give_sigsegv; | |
618 | ||
619 | /* | |
620 | * Arguments to signal handler: | |
621 | * | |
622 | * a0 = signal number | |
623 | * a1 = 0 (should be cause) | |
624 | * a2 = pointer to struct sigcontext | |
625 | * | |
626 | * $25 and c0_epc point to the signal handler, $29 points to the | |
627 | * struct sigframe. | |
628 | */ | |
629 | regs->regs[ 4] = signr; | |
630 | regs->regs[ 5] = 0; | |
631 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
632 | regs->regs[29] = (unsigned long) frame; | |
633 | regs->regs[31] = (unsigned long) frame->sf_code; | |
634 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
635 | ||
722bb63d | 636 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 637 | current->comm, current->pid, |
722bb63d FBH |
638 | frame, regs->cp0_epc, regs->regs[31]); |
639 | ||
7b3e2fc8 | 640 | return 0; |
1da177e4 LT |
641 | |
642 | give_sigsegv: | |
643 | force_sigsegv(signr, current); | |
7b3e2fc8 | 644 | return -EFAULT; |
1da177e4 LT |
645 | } |
646 | ||
151fd6ac | 647 | static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs, |
16cd3951 | 648 | int signr, sigset_t *set, siginfo_t *info) |
1da177e4 | 649 | { |
9bbf28a3 | 650 | struct rt_sigframe32 __user *frame; |
1da177e4 LT |
651 | int err = 0; |
652 | s32 sp; | |
653 | ||
654 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
655 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
656 | goto give_sigsegv; | |
657 | ||
36a1f2c2 | 658 | err |= install_sigtramp(frame->rs_code, __NR_O32_rt_sigreturn); |
1da177e4 LT |
659 | |
660 | /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ | |
661 | err |= copy_siginfo_to_user32(&frame->rs_info, info); | |
662 | ||
663 | /* Create the ucontext. */ | |
664 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
665 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
666 | sp = (int) (long) current->sas_ss_sp; | |
667 | err |= __put_user(sp, | |
668 | &frame->rs_uc.uc_stack.ss_sp); | |
669 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
670 | &frame->rs_uc.uc_stack.ss_flags); | |
671 | err |= __put_user(current->sas_ss_size, | |
672 | &frame->rs_uc.uc_stack.ss_size); | |
673 | err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); | |
431dc804 | 674 | err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); |
1da177e4 LT |
675 | |
676 | if (err) | |
677 | goto give_sigsegv; | |
678 | ||
679 | /* | |
680 | * Arguments to signal handler: | |
681 | * | |
682 | * a0 = signal number | |
683 | * a1 = 0 (should be cause) | |
684 | * a2 = pointer to ucontext | |
685 | * | |
686 | * $25 and c0_epc point to the signal handler, $29 points to | |
687 | * the struct rt_sigframe32. | |
688 | */ | |
689 | regs->regs[ 4] = signr; | |
690 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
691 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
692 | regs->regs[29] = (unsigned long) frame; | |
693 | regs->regs[31] = (unsigned long) frame->rs_code; | |
694 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
695 | ||
722bb63d | 696 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 697 | current->comm, current->pid, |
722bb63d FBH |
698 | frame, regs->cp0_epc, regs->regs[31]); |
699 | ||
7b3e2fc8 | 700 | return 0; |
1da177e4 LT |
701 | |
702 | give_sigsegv: | |
703 | force_sigsegv(signr, current); | |
7b3e2fc8 | 704 | return -EFAULT; |
1da177e4 LT |
705 | } |
706 | ||
151fd6ac RB |
707 | /* |
708 | * o32 compatibility on 64-bit kernels, without DSP ASE | |
709 | */ | |
710 | struct mips_abi mips_abi_32 = { | |
711 | .setup_frame = setup_frame_32, | |
712 | .setup_rt_frame = setup_rt_frame_32, | |
713 | .restart = __NR_O32_restart_syscall | |
714 | }; | |
1da177e4 | 715 | |
dbda6ac0 RB |
716 | SYSCALL_DEFINE4(32_rt_sigaction, int, sig, |
717 | const struct sigaction32 __user *, act, | |
718 | struct sigaction32 __user *, oact, unsigned int, sigsetsize) | |
1da177e4 LT |
719 | { |
720 | struct k_sigaction new_sa, old_sa; | |
721 | int ret = -EINVAL; | |
722 | ||
723 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
724 | if (sigsetsize != sizeof(sigset_t)) | |
725 | goto out; | |
726 | ||
727 | if (act) { | |
77c728c2 | 728 | s32 handler; |
1da177e4 LT |
729 | int err = 0; |
730 | ||
731 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
732 | return -EFAULT; | |
77c728c2 | 733 | err |= __get_user(handler, &act->sa_handler); |
9bbf28a3 | 734 | new_sa.sa.sa_handler = (void __user *)(s64)handler; |
1da177e4 LT |
735 | err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags); |
736 | err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask); | |
737 | if (err) | |
738 | return -EFAULT; | |
739 | } | |
740 | ||
741 | ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); | |
742 | ||
743 | if (!ret && oact) { | |
744 | int err = 0; | |
745 | ||
746 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
747 | return -EFAULT; | |
748 | ||
749 | err |= __put_user((u32)(u64)old_sa.sa.sa_handler, | |
750 | &oact->sa_handler); | |
751 | err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags); | |
752 | err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask); | |
753 | if (err) | |
754 | return -EFAULT; | |
755 | } | |
756 | out: | |
757 | return ret; | |
758 | } | |
759 | ||
dbda6ac0 RB |
760 | SYSCALL_DEFINE4(32_rt_sigprocmask, int, how, compat_sigset_t __user *, set, |
761 | compat_sigset_t __user *, oset, unsigned int, sigsetsize) | |
1da177e4 LT |
762 | { |
763 | sigset_t old_set, new_set; | |
764 | int ret; | |
765 | mm_segment_t old_fs = get_fs(); | |
766 | ||
767 | if (set && get_sigset(&new_set, set)) | |
768 | return -EFAULT; | |
769 | ||
49a89efb | 770 | set_fs(KERNEL_DS); |
9bbf28a3 AN |
771 | ret = sys_rt_sigprocmask(how, set ? (sigset_t __user *)&new_set : NULL, |
772 | oset ? (sigset_t __user *)&old_set : NULL, | |
773 | sigsetsize); | |
49a89efb | 774 | set_fs(old_fs); |
1da177e4 LT |
775 | |
776 | if (!ret && oset && put_sigset(&old_set, oset)) | |
777 | return -EFAULT; | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
dbda6ac0 RB |
782 | SYSCALL_DEFINE2(32_rt_sigpending, compat_sigset_t __user *, uset, |
783 | unsigned int, sigsetsize) | |
1da177e4 LT |
784 | { |
785 | int ret; | |
786 | sigset_t set; | |
787 | mm_segment_t old_fs = get_fs(); | |
788 | ||
49a89efb | 789 | set_fs(KERNEL_DS); |
9bbf28a3 | 790 | ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize); |
49a89efb | 791 | set_fs(old_fs); |
1da177e4 LT |
792 | |
793 | if (!ret && put_sigset(&set, uset)) | |
794 | return -EFAULT; | |
795 | ||
796 | return ret; | |
797 | } | |
798 | ||
dbda6ac0 RB |
799 | SYSCALL_DEFINE3(32_rt_sigqueueinfo, int, pid, int, sig, |
800 | compat_siginfo_t __user *, uinfo) | |
1da177e4 LT |
801 | { |
802 | siginfo_t info; | |
803 | int ret; | |
804 | mm_segment_t old_fs = get_fs(); | |
805 | ||
49a89efb RB |
806 | if (copy_from_user(&info, uinfo, 3*sizeof(int)) || |
807 | copy_from_user(info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE)) | |
1da177e4 | 808 | return -EFAULT; |
49a89efb | 809 | set_fs(KERNEL_DS); |
9bbf28a3 | 810 | ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info); |
49a89efb | 811 | set_fs(old_fs); |
1da177e4 LT |
812 | return ret; |
813 | } | |
54f2da75 | 814 | |
dbda6ac0 RB |
815 | SYSCALL_DEFINE5(32_waitid, int, which, compat_pid_t, pid, |
816 | compat_siginfo_t __user *, uinfo, int, options, | |
817 | struct compat_rusage __user *, uru) | |
54f2da75 RB |
818 | { |
819 | siginfo_t info; | |
820 | struct rusage ru; | |
821 | long ret; | |
822 | mm_segment_t old_fs = get_fs(); | |
823 | ||
824 | info.si_signo = 0; | |
49a89efb | 825 | set_fs(KERNEL_DS); |
54f2da75 RB |
826 | ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options, |
827 | uru ? (struct rusage __user *) &ru : NULL); | |
49a89efb | 828 | set_fs(old_fs); |
54f2da75 RB |
829 | |
830 | if (ret < 0 || info.si_signo == 0) | |
831 | return ret; | |
832 | ||
833 | if (uru && (ret = put_compat_rusage(&ru, uru))) | |
834 | return ret; | |
835 | ||
836 | BUG_ON(info.si_code & __SI_MASK); | |
837 | info.si_code |= __SI_CHLD; | |
838 | return copy_siginfo_to_user32(uinfo, &info); | |
839 | } | |
137f6f3e RB |
840 | |
841 | static int signal32_init(void) | |
842 | { | |
843 | if (cpu_has_fpu) { | |
844 | save_fp_context32 = _save_fp_context32; | |
845 | restore_fp_context32 = _restore_fp_context32; | |
846 | } else { | |
847 | save_fp_context32 = fpu_emulator_save_context32; | |
848 | restore_fp_context32 = fpu_emulator_restore_context32; | |
849 | } | |
850 | ||
851 | return 0; | |
852 | } | |
853 | ||
854 | arch_initcall(signal32_init); |