1 /* Signal support for 32-bit kernel builds
3 * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
4 * Copyright (C) 2006 Kyle McMartin <kyle at parisc-linux.org>
6 * Code was mostly borrowed from kernel/signal.c.
7 * See kernel/signal.c for additional Copyrights.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/compat.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/unistd.h>
29 #include <linux/init.h>
30 #include <linux/sched.h>
31 #include <linux/syscalls.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
35 #include <asm/uaccess.h>
40 #define DEBUG_COMPAT_SIG 0
41 #define DEBUG_COMPAT_SIG_LEVEL 2
44 #define DBG(LEVEL, ...) \
45 ((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \
46 ? printk(__VA_ARGS__) : (void) 0)
48 #define DBG(LEVEL, ...)
51 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
54 sigset_32to64(sigset_t *s64, compat_sigset_t *s32)
56 s64->sig[0] = s32->sig[0] | ((unsigned long)s32->sig[1] << 32);
60 sigset_64to32(compat_sigset_t *s32, sigset_t *s64)
62 s32->sig[0] = s64->sig[0] & 0xffffffffUL;
63 s32->sig[1] = (s64->sig[0] >> 32) & 0xffffffffUL;
67 put_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
71 if (sz != sizeof *set) panic("put_sigset32()");
72 sigset_64to32(&s, set);
74 return copy_to_user(up, &s, sizeof s);
78 get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz)
83 if (sz != sizeof *set) panic("put_sigset32()");
85 if ((r = copy_from_user(&s, up, sz)) == 0) {
86 sigset_32to64(set, &s);
92 int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *oset,
93 unsigned int sigsetsize)
95 sigset_t old_set, new_set;
98 if (set && get_sigset32(set, &new_set, sigsetsize))
101 KERNEL_SYSCALL(ret, sys_rt_sigprocmask, how, set ? (sigset_t __user *)&new_set : NULL,
102 oset ? (sigset_t __user *)&old_set : NULL, sigsetsize);
104 if (!ret && oset && put_sigset32(oset, &old_set, sigsetsize))
111 int sys32_rt_sigpending(compat_sigset_t __user *uset, unsigned int sigsetsize)
116 KERNEL_SYSCALL(ret, sys_rt_sigpending, (sigset_t __user *)&set, sigsetsize);
118 if (!ret && put_sigset32(uset, &set, sigsetsize))
125 sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, struct sigaction32 __user *oact,
128 struct k_sigaction32 new_sa32, old_sa32;
129 struct k_sigaction new_sa, old_sa;
133 if (copy_from_user(&new_sa32.sa, act, sizeof new_sa32.sa))
135 new_sa.sa.sa_handler = (__sighandler_t)(unsigned long)new_sa32.sa.sa_handler;
136 new_sa.sa.sa_flags = new_sa32.sa.sa_flags;
137 sigset_32to64(&new_sa.sa.sa_mask, &new_sa32.sa.sa_mask);
140 ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
143 sigset_64to32(&old_sa32.sa.sa_mask, &old_sa.sa.sa_mask);
144 old_sa32.sa.sa_flags = old_sa.sa.sa_flags;
145 old_sa32.sa.sa_handler = (__sighandler_t32)(unsigned long)old_sa.sa.sa_handler;
146 if (copy_to_user(oact, &old_sa32.sa, sizeof old_sa32.sa))
153 do_sigaltstack32 (const compat_stack_t __user *uss32, compat_stack_t __user *uoss32, unsigned long sp)
155 compat_stack_t ss32, oss32;
157 stack_t *ssp = NULL, *ossp = NULL;
161 if (copy_from_user(&ss32, uss32, sizeof ss32))
164 ss.ss_sp = (void __user *)(unsigned long)ss32.ss_sp;
165 ss.ss_flags = ss32.ss_flags;
166 ss.ss_size = ss32.ss_size;
174 KERNEL_SYSCALL(ret, do_sigaltstack, (const stack_t __user *)ssp, (stack_t __user *)ossp, sp);
176 if (!ret && uoss32) {
177 oss32.ss_sp = (unsigned int)(unsigned long)oss.ss_sp;
178 oss32.ss_flags = oss.ss_flags;
179 oss32.ss_size = oss.ss_size;
180 if (copy_to_user(uoss32, &oss32, sizeof *uoss32))
188 restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf,
189 struct pt_regs *regs)
192 compat_uint_t compat_reg;
193 compat_uint_t compat_regt;
196 /* When loading 32-bit values into 64-bit registers make
197 sure to clear the upper 32-bits */
198 DBG(2,"restore_sigcontext32: PER_LINUX32 process\n");
199 DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs);
200 DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc));
201 for(regn=0; regn < 32; regn++){
202 err |= __get_user(compat_reg,&sc->sc_gr[regn]);
203 regs->gr[regn] = compat_reg;
204 /* Load upper half */
205 err |= __get_user(compat_regt,&rf->rf_gr[regn]);
206 regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg;
207 DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n",
208 regn, regs->gr[regn], compat_regt, compat_reg);
210 DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr));
211 /* XXX: BE WARNED FR's are 64-BIT! */
212 err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
214 /* Better safe than sorry, pass __get_user two things of
215 the same size and let gcc do the upward conversion to
217 err |= __get_user(compat_reg, &sc->sc_iaoq[0]);
218 /* Load upper half */
219 err |= __get_user(compat_regt, &rf->rf_iaoq[0]);
220 regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
221 DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt);
222 DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n",
223 &sc->sc_iaoq[0], compat_reg);
225 err |= __get_user(compat_reg, &sc->sc_iaoq[1]);
226 /* Load upper half */
227 err |= __get_user(compat_regt, &rf->rf_iaoq[1]);
228 regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
229 DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt);
230 DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n",
231 &sc->sc_iaoq[1],compat_reg);
232 DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n",
233 regs->iaoq[0],regs->iaoq[1]);
235 err |= __get_user(compat_reg, &sc->sc_iasq[0]);
236 /* Load the upper half for iasq */
237 err |= __get_user(compat_regt, &rf->rf_iasq[0]);
238 regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
239 DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt);
241 err |= __get_user(compat_reg, &sc->sc_iasq[1]);
242 /* Load the upper half for iasq */
243 err |= __get_user(compat_regt, &rf->rf_iasq[1]);
244 regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
245 DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt);
246 DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n",
247 regs->iasq[0],regs->iasq[1]);
249 err |= __get_user(compat_reg, &sc->sc_sar);
250 /* Load the upper half for sar */
251 err |= __get_user(compat_regt, &rf->rf_sar);
252 regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg;
253 DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt);
254 DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar);
255 DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]);
261 * Set up the sigcontext structure for this process.
262 * This is not an easy task if the kernel is 64-bit, it will require
263 * that we examine the process personality to determine if we need to
264 * truncate for a 32-bit userspace.
267 setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf,
268 struct pt_regs *regs, int in_syscall)
270 compat_int_t flags = 0;
272 compat_uint_t compat_reg;
273 compat_uint_t compat_regb;
276 if (on_sig_stack((unsigned long) sc))
277 flags |= PARISC_SC_FLAG_ONSTACK;
281 DBG(1,"setup_sigcontext32: in_syscall\n");
283 flags |= PARISC_SC_FLAG_IN_SYSCALL;
285 compat_reg = (compat_uint_t)(regs->gr[31]);
286 /* regs->iaoq is undefined in the syscall return path */
287 err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
288 DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
289 &sc->sc_iaoq[0], compat_reg);
291 /* Store upper half */
292 compat_reg = (compat_uint_t)(regs->gr[31] >> 32);
293 err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
294 DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
297 compat_reg = (compat_uint_t)(regs->gr[31]+4);
298 err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
299 DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
300 &sc->sc_iaoq[1], compat_reg);
301 /* Store upper half */
302 compat_reg = (compat_uint_t)((regs->gr[31]+4) >> 32);
303 err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
304 DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
307 compat_reg = (compat_uint_t)(regs->sr[3]);
308 err |= __put_user(compat_reg, &sc->sc_iasq[0]);
309 err |= __put_user(compat_reg, &sc->sc_iasq[1]);
311 /* Store upper half */
312 compat_reg = (compat_uint_t)(regs->sr[3] >> 32);
313 err |= __put_user(compat_reg, &rf->rf_iasq[0]);
314 err |= __put_user(compat_reg, &rf->rf_iasq[1]);
316 DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
317 DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
318 DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n",
319 regs->gr[31], regs->gr[31]+4);
323 compat_reg = (compat_uint_t)(regs->iaoq[0]);
324 err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
325 DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
326 &sc->sc_iaoq[0], compat_reg);
327 /* Store upper half */
328 compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32);
329 err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
330 DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
332 compat_reg = (compat_uint_t)(regs->iaoq[1]);
333 err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
334 DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
335 &sc->sc_iaoq[1], compat_reg);
336 /* Store upper half */
337 compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32);
338 err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
339 DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
342 compat_reg = (compat_uint_t)(regs->iasq[0]);
343 err |= __put_user(compat_reg, &sc->sc_iasq[0]);
344 DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n",
345 &sc->sc_iasq[0], compat_reg);
346 /* Store upper half */
347 compat_reg = (compat_uint_t)(regs->iasq[0] >> 32);
348 err |= __put_user(compat_reg, &rf->rf_iasq[0]);
349 DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
352 compat_reg = (compat_uint_t)(regs->iasq[1]);
353 err |= __put_user(compat_reg, &sc->sc_iasq[1]);
354 DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n",
355 &sc->sc_iasq[1], compat_reg);
356 /* Store upper half */
357 compat_reg = (compat_uint_t)(regs->iasq[1] >> 32);
358 err |= __put_user(compat_reg, &rf->rf_iasq[1]);
359 DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
361 /* Print out the IAOQ for debugging */
362 DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n",
363 regs->iaoq[0], regs->iaoq[1]);
366 err |= __put_user(flags, &sc->sc_flags);
368 DBG(1,"setup_sigcontext32: Truncating general registers.\n");
370 for(regn=0; regn < 32; regn++){
371 /* Truncate a general register */
372 compat_reg = (compat_uint_t)(regs->gr[regn]);
373 err |= __put_user(compat_reg, &sc->sc_gr[regn]);
374 /* Store upper half */
375 compat_regb = (compat_uint_t)(regs->gr[regn] >> 32);
376 err |= __put_user(compat_regb, &rf->rf_gr[regn]);
378 /* DEBUG: Write out the "upper / lower" register data */
379 DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn,
380 compat_regb, compat_reg);
383 /* Copy the floating point registers (same size)
384 XXX: BE WARNED FR's are 64-BIT! */
385 DBG(1,"setup_sigcontext32: Copying from regs to sc, "
386 "sc->sc_fr size = %#lx, regs->fr size = %#lx\n",
387 sizeof(regs->fr), sizeof(sc->sc_fr));
388 err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
390 compat_reg = (compat_uint_t)(regs->sar);
391 err |= __put_user(compat_reg, &sc->sc_sar);
392 DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg);
393 /* Store upper half */
394 compat_reg = (compat_uint_t)(regs->sar >> 32);
395 err |= __put_user(compat_reg, &rf->rf_sar);
396 DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg);
397 DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]);
403 copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
408 if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
411 err = __get_user(to->si_signo, &from->si_signo);
412 err |= __get_user(to->si_errno, &from->si_errno);
413 err |= __get_user(to->si_code, &from->si_code);
416 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
418 switch (to->si_code >> 16) {
419 case __SI_CHLD >> 16:
420 err |= __get_user(to->si_utime, &from->si_utime);
421 err |= __get_user(to->si_stime, &from->si_stime);
422 err |= __get_user(to->si_status, &from->si_status);
424 err |= __get_user(to->si_pid, &from->si_pid);
425 err |= __get_user(to->si_uid, &from->si_uid);
427 case __SI_FAULT >> 16:
428 err |= __get_user(addr, &from->si_addr);
429 to->si_addr = compat_ptr(addr);
431 case __SI_POLL >> 16:
432 err |= __get_user(to->si_band, &from->si_band);
433 err |= __get_user(to->si_fd, &from->si_fd);
435 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
436 case __SI_MESGQ >> 16:
437 err |= __get_user(to->si_pid, &from->si_pid);
438 err |= __get_user(to->si_uid, &from->si_uid);
439 err |= __get_user(to->si_int, &from->si_int);
447 copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
453 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
456 /* If you change siginfo_t structure, please be sure
457 this code is fixed accordingly.
458 It should never copy any pad contained in the structure
459 to avoid security leaks, but must copy the generic
460 3 ints plus the relevant union member.
461 This routine must convert siginfo from 64bit to 32bit as well
463 err = __put_user(from->si_signo, &to->si_signo);
464 err |= __put_user(from->si_errno, &to->si_errno);
465 err |= __put_user((short)from->si_code, &to->si_code);
466 if (from->si_code < 0)
467 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
469 switch (from->si_code >> 16) {
470 case __SI_CHLD >> 16:
471 err |= __put_user(from->si_utime, &to->si_utime);
472 err |= __put_user(from->si_stime, &to->si_stime);
473 err |= __put_user(from->si_status, &to->si_status);
475 err |= __put_user(from->si_pid, &to->si_pid);
476 err |= __put_user(from->si_uid, &to->si_uid);
478 case __SI_FAULT >> 16:
479 addr = ptr_to_compat(from->si_addr);
480 err |= __put_user(addr, &to->si_addr);
482 case __SI_POLL >> 16:
483 err |= __put_user(from->si_band, &to->si_band);
484 err |= __put_user(from->si_fd, &to->si_fd);
486 case __SI_TIMER >> 16:
487 err |= __put_user(from->si_tid, &to->si_tid);
488 err |= __put_user(from->si_overrun, &to->si_overrun);
489 val = (compat_int_t)from->si_int;
490 err |= __put_user(val, &to->si_int);
492 case __SI_RT >> 16: /* Not generated by the kernel as of now. */
493 case __SI_MESGQ >> 16:
494 err |= __put_user(from->si_uid, &to->si_uid);
495 err |= __put_user(from->si_pid, &to->si_pid);
496 val = (compat_int_t)from->si_int;
497 err |= __put_user(val, &to->si_int);
504 asmlinkage long compat_sys_rt_sigqueueinfo(int pid, int sig,
505 struct compat_siginfo __user *uinfo)
509 if (copy_siginfo_from_user32(&info, uinfo))
512 /* Not even root can pretend to send signals from the kernel.
513 Nor can they impersonate a kill(), which adds source info. */
514 if (info.si_code >= 0)
518 /* POSIX.1b doesn't mention process groups. */
519 return kill_proc_info(sig, &info, pid);