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 | 31 | #include <asm/ucontext.h> |
1da177e4 | 32 | #include <asm/fpu.h> |
02416dcf | 33 | #include <asm/war.h> |
b81947c6 | 34 | #include <asm/dsp.h> |
1da177e4 | 35 | |
36a1f2c2 FBH |
36 | #include "signal-common.h" |
37 | ||
1da177e4 LT |
38 | /* |
39 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
40 | */ | |
70342287 | 41 | #define __NR_O32_restart_syscall 4253 |
1da177e4 | 42 | |
1da177e4 LT |
43 | /* 32-bit compatibility types */ |
44 | ||
1da177e4 LT |
45 | typedef unsigned int __sighandler32_t; |
46 | typedef void (*vfptr_t)(void); | |
47 | ||
1da177e4 | 48 | struct ucontext32 { |
70342287 RB |
49 | u32 uc_flags; |
50 | s32 uc_link; | |
ea536ad4 | 51 | compat_stack_t uc_stack; |
1da177e4 | 52 | struct sigcontext32 uc_mcontext; |
70342287 | 53 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
1da177e4 LT |
54 | }; |
55 | ||
dd02f06a RB |
56 | struct sigframe32 { |
57 | u32 sf_ass[4]; /* argument save space for o32 */ | |
d814c28c | 58 | u32 sf_pad[2]; /* Was: signal trampoline */ |
dd02f06a | 59 | struct sigcontext32 sf_sc; |
755f21bb | 60 | compat_sigset_t sf_mask; |
dd02f06a RB |
61 | }; |
62 | ||
c0b9bae9 FBH |
63 | struct rt_sigframe32 { |
64 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 65 | u32 rs_pad[2]; /* Was: signal trampoline */ |
c0b9bae9 FBH |
66 | compat_siginfo_t rs_info; |
67 | struct ucontext32 rs_uc; | |
68 | }; | |
69 | ||
9432a9ba FBH |
70 | static int setup_sigcontext32(struct pt_regs *regs, |
71 | struct sigcontext32 __user *sc) | |
72 | { | |
73 | int err = 0; | |
74 | int i; | |
75 | ||
76 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
9432a9ba FBH |
77 | |
78 | err |= __put_user(0, &sc->sc_regs[0]); | |
79 | for (i = 1; i < 32; i++) | |
80 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
81 | ||
82 | err |= __put_user(regs->hi, &sc->sc_mdhi); | |
83 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
84 | if (cpu_has_dsp) { | |
85 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
86 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
87 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
88 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
89 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
90 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
91 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
92 | } | |
93 | ||
d02a40af PB |
94 | /* |
95 | * Save FPU state to signal context. Signal handler | |
96 | * will "inherit" current FPU state. | |
97 | */ | |
98 | err |= protected_save_fp_context(sc); | |
9432a9ba | 99 | |
9432a9ba FBH |
100 | return err; |
101 | } | |
102 | ||
103 | static int restore_sigcontext32(struct pt_regs *regs, | |
104 | struct sigcontext32 __user *sc) | |
105 | { | |
9432a9ba FBH |
106 | int err = 0; |
107 | s32 treg; | |
108 | int i; | |
109 | ||
110 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 111 | current->restart_block.fn = do_no_restart_syscall; |
9432a9ba FBH |
112 | |
113 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
114 | err |= __get_user(regs->hi, &sc->sc_mdhi); | |
115 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
116 | if (cpu_has_dsp) { | |
117 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
118 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
119 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
120 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
121 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
122 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
123 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
124 | } | |
125 | ||
126 | for (i = 1; i < 32; i++) | |
127 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
128 | ||
d02a40af | 129 | return err ?: protected_restore_fp_context(sc); |
9432a9ba FBH |
130 | } |
131 | ||
1da177e4 LT |
132 | /* |
133 | * Atomically swap in the new signal mask, and wait for a signal. | |
134 | */ | |
135 | ||
1910f4ab | 136 | asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset) |
1da177e4 | 137 | { |
1910f4ab | 138 | return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t)); |
1da177e4 LT |
139 | } |
140 | ||
aa584802 AV |
141 | SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act, |
142 | struct compat_sigaction __user *, oact) | |
1da177e4 LT |
143 | { |
144 | struct k_sigaction new_ka, old_ka; | |
145 | int ret; | |
146 | int err = 0; | |
147 | ||
148 | if (act) { | |
149 | old_sigset_t mask; | |
77c728c2 | 150 | s32 handler; |
1da177e4 LT |
151 | |
152 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
153 | return -EFAULT; | |
77c728c2 | 154 | err |= __get_user(handler, &act->sa_handler); |
9bbf28a3 | 155 | new_ka.sa.sa_handler = (void __user *)(s64)handler; |
1da177e4 LT |
156 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
157 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
158 | if (err) | |
159 | return -EFAULT; | |
160 | ||
161 | siginitset(&new_ka.sa.sa_mask, mask); | |
162 | } | |
163 | ||
164 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
165 | ||
166 | if (!ret && oact) { | |
167 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
6254944f | 168 | return -EFAULT; |
1da177e4 LT |
169 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
170 | err |= __put_user((u32)(u64)old_ka.sa.sa_handler, | |
70342287 | 171 | &oact->sa_handler); |
1da177e4 | 172 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); |
6254944f MM |
173 | err |= __put_user(0, &oact->sa_mask.sig[1]); |
174 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
175 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
176 | if (err) | |
1da177e4 LT |
177 | return -EFAULT; |
178 | } | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
ce395960 | 183 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
1da177e4 LT |
184 | { |
185 | int err; | |
186 | ||
187 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
188 | return -EFAULT; | |
189 | ||
190 | /* If you change siginfo_t structure, please be sure | |
191 | this code is fixed accordingly. | |
192 | It should never copy any pad contained in the structure | |
193 | to avoid security leaks, but must copy the generic | |
194 | 3 ints plus the relevant union member. | |
195 | This routine must convert siginfo from 64bit to 32bit as well | |
196 | at the same time. */ | |
197 | err = __put_user(from->si_signo, &to->si_signo); | |
198 | err |= __put_user(from->si_errno, &to->si_errno); | |
199 | err |= __put_user((short)from->si_code, &to->si_code); | |
200 | if (from->si_code < 0) | |
201 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
202 | else { | |
203 | switch (from->si_code >> 16) { | |
a982099c RB |
204 | case __SI_TIMER >> 16: |
205 | err |= __put_user(from->si_tid, &to->si_tid); | |
206 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
207 | err |= __put_user(from->si_int, &to->si_int); | |
208 | break; | |
1da177e4 LT |
209 | case __SI_CHLD >> 16: |
210 | err |= __put_user(from->si_utime, &to->si_utime); | |
211 | err |= __put_user(from->si_stime, &to->si_stime); | |
212 | err |= __put_user(from->si_status, &to->si_status); | |
213 | default: | |
214 | err |= __put_user(from->si_pid, &to->si_pid); | |
215 | err |= __put_user(from->si_uid, &to->si_uid); | |
216 | break; | |
217 | case __SI_FAULT >> 16: | |
5665a0ac | 218 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); |
1da177e4 LT |
219 | break; |
220 | case __SI_POLL >> 16: | |
221 | err |= __put_user(from->si_band, &to->si_band); | |
222 | err |= __put_user(from->si_fd, &to->si_fd); | |
223 | break; | |
224 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
225 | case __SI_MESGQ >> 16: | |
226 | err |= __put_user(from->si_pid, &to->si_pid); | |
227 | err |= __put_user(from->si_uid, &to->si_uid); | |
228 | err |= __put_user(from->si_int, &to->si_int); | |
229 | break; | |
230 | } | |
231 | } | |
232 | return err; | |
233 | } | |
234 | ||
5d9a76cd TB |
235 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
236 | { | |
5d9a76cd TB |
237 | if (copy_from_user(to, from, 3*sizeof(int)) || |
238 | copy_from_user(to->_sifields._pad, | |
239 | from->_sifields._pad, SI_PAD_SIZE32)) | |
240 | return -EFAULT; | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
f90080a0 | 245 | asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 246 | { |
dd02f06a | 247 | struct sigframe32 __user *frame; |
1da177e4 | 248 | sigset_t blocked; |
c6a2f467 | 249 | int sig; |
1da177e4 | 250 | |
dd02f06a | 251 | frame = (struct sigframe32 __user *) regs.regs[29]; |
1da177e4 LT |
252 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
253 | goto badframe; | |
431dc804 | 254 | if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask)) |
1da177e4 LT |
255 | goto badframe; |
256 | ||
8598f3cd | 257 | set_current_blocked(&blocked); |
1da177e4 | 258 | |
c6a2f467 AN |
259 | sig = restore_sigcontext32(®s, &frame->sf_sc); |
260 | if (sig < 0) | |
1da177e4 | 261 | goto badframe; |
c6a2f467 AN |
262 | else if (sig) |
263 | force_sig(sig, current); | |
1da177e4 LT |
264 | |
265 | /* | |
266 | * Don't let your children do this ... | |
267 | */ | |
1da177e4 LT |
268 | __asm__ __volatile__( |
269 | "move\t$29, %0\n\t" | |
270 | "j\tsyscall_exit" | |
271 | :/* no outputs */ | |
272 | :"r" (®s)); | |
273 | /* Unreached */ | |
274 | ||
275 | badframe: | |
276 | force_sig(SIGSEGV, current); | |
277 | } | |
278 | ||
f90080a0 | 279 | asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 280 | { |
9bbf28a3 | 281 | struct rt_sigframe32 __user *frame; |
1da177e4 | 282 | sigset_t set; |
c6a2f467 | 283 | int sig; |
1da177e4 | 284 | |
9bbf28a3 | 285 | frame = (struct rt_sigframe32 __user *) regs.regs[29]; |
1da177e4 LT |
286 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
287 | goto badframe; | |
431dc804 | 288 | if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) |
1da177e4 LT |
289 | goto badframe; |
290 | ||
8598f3cd | 291 | set_current_blocked(&set); |
1da177e4 | 292 | |
c6a2f467 AN |
293 | sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext); |
294 | if (sig < 0) | |
1da177e4 | 295 | goto badframe; |
c6a2f467 AN |
296 | else if (sig) |
297 | force_sig(sig, current); | |
1da177e4 | 298 | |
ea536ad4 | 299 | if (compat_restore_altstack(&frame->rs_uc.uc_stack)) |
1da177e4 | 300 | goto badframe; |
1da177e4 LT |
301 | |
302 | /* | |
303 | * Don't let your children do this ... | |
304 | */ | |
305 | __asm__ __volatile__( | |
306 | "move\t$29, %0\n\t" | |
307 | "j\tsyscall_exit" | |
308 | :/* no outputs */ | |
309 | :"r" (®s)); | |
310 | /* Unreached */ | |
311 | ||
312 | badframe: | |
313 | force_sig(SIGSEGV, current); | |
314 | } | |
315 | ||
81d103bf RW |
316 | static int setup_frame_32(void *sig_return, struct ksignal *ksig, |
317 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 318 | { |
dd02f06a | 319 | struct sigframe32 __user *frame; |
1da177e4 LT |
320 | int err = 0; |
321 | ||
7c4f5635 | 322 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 323 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 324 | return -EFAULT; |
1da177e4 | 325 | |
1da177e4 | 326 | err |= setup_sigcontext32(regs, &frame->sf_sc); |
431dc804 RB |
327 | err |= __copy_conv_sigset_to_user(&frame->sf_mask, set); |
328 | ||
1da177e4 | 329 | if (err) |
81d103bf | 330 | return -EFAULT; |
1da177e4 LT |
331 | |
332 | /* | |
333 | * Arguments to signal handler: | |
334 | * | |
335 | * a0 = signal number | |
336 | * a1 = 0 (should be cause) | |
337 | * a2 = pointer to struct sigcontext | |
338 | * | |
339 | * $25 and c0_epc point to the signal handler, $29 points to the | |
340 | * struct sigframe. | |
341 | */ | |
81d103bf | 342 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
343 | regs->regs[ 5] = 0; |
344 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
345 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 346 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 347 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 348 | |
722bb63d | 349 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 350 | current->comm, current->pid, |
722bb63d FBH |
351 | frame, regs->cp0_epc, regs->regs[31]); |
352 | ||
7b3e2fc8 | 353 | return 0; |
1da177e4 LT |
354 | } |
355 | ||
81d103bf RW |
356 | static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig, |
357 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 358 | { |
9bbf28a3 | 359 | struct rt_sigframe32 __user *frame; |
1da177e4 | 360 | int err = 0; |
1da177e4 | 361 | |
7c4f5635 | 362 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 363 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 364 | return -EFAULT; |
1da177e4 | 365 | |
1da177e4 | 366 | /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */ |
81d103bf | 367 | err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info); |
1da177e4 | 368 | |
70342287 | 369 | /* Create the ucontext. */ |
1da177e4 LT |
370 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
371 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
ea536ad4 | 372 | err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 | 373 | err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext); |
431dc804 | 374 | err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); |
1da177e4 LT |
375 | |
376 | if (err) | |
81d103bf | 377 | return -EFAULT; |
1da177e4 LT |
378 | |
379 | /* | |
380 | * Arguments to signal handler: | |
381 | * | |
382 | * a0 = signal number | |
383 | * a1 = 0 (should be cause) | |
384 | * a2 = pointer to ucontext | |
385 | * | |
386 | * $25 and c0_epc point to the signal handler, $29 points to | |
387 | * the struct rt_sigframe32. | |
388 | */ | |
81d103bf | 389 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
390 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
391 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
392 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 393 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 394 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 395 | |
722bb63d | 396 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 397 | current->comm, current->pid, |
722bb63d FBH |
398 | frame, regs->cp0_epc, regs->regs[31]); |
399 | ||
7b3e2fc8 | 400 | return 0; |
1da177e4 LT |
401 | } |
402 | ||
151fd6ac RB |
403 | /* |
404 | * o32 compatibility on 64-bit kernels, without DSP ASE | |
405 | */ | |
406 | struct mips_abi mips_abi_32 = { | |
407 | .setup_frame = setup_frame_32, | |
70342287 | 408 | .setup_rt_frame = setup_rt_frame_32, |
77856100 PB |
409 | .restart = __NR_O32_restart_syscall, |
410 | ||
411 | .off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs), | |
412 | .off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr), | |
413 | .off_sc_used_math = offsetof(struct sigcontext32, sc_used_math), | |
ebb5e78c AS |
414 | |
415 | .vdso = &vdso_image_o32, | |
151fd6ac | 416 | }; |