2 * arch/s390/kernel/compat_signal.c
4 * Copyright (C) IBM Corp. 2000,2006
5 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
6 * Gerhard Tonn (ton@de.ibm.com)
8 * Copyright (C) 1991, 1992 Linus Torvalds
10 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
13 #include <linux/compat.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/kernel.h>
18 #include <linux/signal.h>
19 #include <linux/errno.h>
20 #include <linux/wait.h>
21 #include <linux/ptrace.h>
22 #include <linux/unistd.h>
23 #include <linux/stddef.h>
24 #include <linux/tty.h>
25 #include <linux/personality.h>
26 #include <linux/binfmts.h>
27 #include <asm/ucontext.h>
28 #include <asm/uaccess.h>
29 #include <asm/lowcore.h>
30 #include <asm/switch_to.h>
31 #include "compat_linux.h"
32 #include "compat_ptrace.h"
37 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
38 struct sigcontext32 sc;
41 __u32 gprs_high[NUM_GPRS];
42 __u8 retcode[S390_SYSCALL_SIZE];
47 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
48 __u8 retcode[S390_SYSCALL_SIZE];
49 compat_siginfo_t info;
51 __u32 gprs_high[NUM_GPRS];
54 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
58 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
61 /* If you change siginfo_t structure, please be sure
62 this code is fixed accordingly.
63 It should never copy any pad contained in the structure
64 to avoid security leaks, but must copy the generic
65 3 ints plus the relevant union member.
66 This routine must convert siginfo from 64bit to 32bit as well
68 err = __put_user(from->si_signo, &to->si_signo);
69 err |= __put_user(from->si_errno, &to->si_errno);
70 err |= __put_user((short)from->si_code, &to->si_code);
71 if (from->si_code < 0)
72 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
74 switch (from->si_code >> 16) {
75 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
76 case __SI_MESGQ >> 16:
77 err |= __put_user(from->si_int, &to->si_int);
80 err |= __put_user(from->si_pid, &to->si_pid);
81 err |= __put_user(from->si_uid, &to->si_uid);
84 err |= __put_user(from->si_pid, &to->si_pid);
85 err |= __put_user(from->si_uid, &to->si_uid);
86 err |= __put_user(from->si_utime, &to->si_utime);
87 err |= __put_user(from->si_stime, &to->si_stime);
88 err |= __put_user(from->si_status, &to->si_status);
90 case __SI_FAULT >> 16:
91 err |= __put_user((unsigned long) from->si_addr,
95 err |= __put_user(from->si_band, &to->si_band);
96 err |= __put_user(from->si_fd, &to->si_fd);
98 case __SI_TIMER >> 16:
99 err |= __put_user(from->si_tid, &to->si_tid);
100 err |= __put_user(from->si_overrun, &to->si_overrun);
101 err |= __put_user(from->si_int, &to->si_int);
110 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
115 if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
118 err = __get_user(to->si_signo, &from->si_signo);
119 err |= __get_user(to->si_errno, &from->si_errno);
120 err |= __get_user(to->si_code, &from->si_code);
123 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
125 switch (to->si_code >> 16) {
126 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
127 case __SI_MESGQ >> 16:
128 err |= __get_user(to->si_int, &from->si_int);
130 case __SI_KILL >> 16:
131 err |= __get_user(to->si_pid, &from->si_pid);
132 err |= __get_user(to->si_uid, &from->si_uid);
134 case __SI_CHLD >> 16:
135 err |= __get_user(to->si_pid, &from->si_pid);
136 err |= __get_user(to->si_uid, &from->si_uid);
137 err |= __get_user(to->si_utime, &from->si_utime);
138 err |= __get_user(to->si_stime, &from->si_stime);
139 err |= __get_user(to->si_status, &from->si_status);
141 case __SI_FAULT >> 16:
142 err |= __get_user(tmp, &from->si_addr);
143 to->si_addr = (void __force __user *)
144 (u64) (tmp & PSW32_ADDR_INSN);
146 case __SI_POLL >> 16:
147 err |= __get_user(to->si_band, &from->si_band);
148 err |= __get_user(to->si_fd, &from->si_fd);
150 case __SI_TIMER >> 16:
151 err |= __get_user(to->si_tid, &from->si_tid);
152 err |= __get_user(to->si_overrun, &from->si_overrun);
153 err |= __get_user(to->si_int, &from->si_int);
163 sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
164 struct old_sigaction32 __user *oact)
166 struct k_sigaction new_ka, old_ka;
167 unsigned long sa_handler, sa_restorer;
171 compat_old_sigset_t mask;
172 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
173 __get_user(sa_handler, &act->sa_handler) ||
174 __get_user(sa_restorer, &act->sa_restorer) ||
175 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
176 __get_user(mask, &act->sa_mask))
178 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
179 new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
180 siginitset(&new_ka.sa.sa_mask, mask);
183 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
186 sa_handler = (unsigned long) old_ka.sa.sa_handler;
187 sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
188 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
189 __put_user(sa_handler, &oact->sa_handler) ||
190 __put_user(sa_restorer, &oact->sa_restorer) ||
191 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
192 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
200 sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
201 struct sigaction32 __user *oact, size_t sigsetsize)
203 struct k_sigaction new_ka, old_ka;
204 unsigned long sa_handler;
206 compat_sigset_t set32;
208 /* XXX: Don't preclude handling different sized sigset_t's. */
209 if (sigsetsize != sizeof(compat_sigset_t))
213 ret = get_user(sa_handler, &act->sa_handler);
214 ret |= __copy_from_user(&set32, &act->sa_mask,
215 sizeof(compat_sigset_t));
216 new_ka.sa.sa_mask.sig[0] =
217 set32.sig[0] | (((long)set32.sig[1]) << 32);
218 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
222 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
225 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
228 set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
229 set32.sig[0] = old_ka.sa.sa_mask.sig[0];
230 ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
231 ret |= __copy_to_user(&oact->sa_mask, &set32,
232 sizeof(compat_sigset_t));
233 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
240 sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
242 struct pt_regs *regs = task_pt_regs(current);
246 mm_segment_t old_fs = get_fs();
249 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
251 err |= __get_user(ss_sp, &uss->ss_sp);
252 err |= __get_user(kss.ss_size, &uss->ss_size);
253 err |= __get_user(kss.ss_flags, &uss->ss_flags);
256 kss.ss_sp = (void __user *) ss_sp;
260 ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
261 (stack_t __force __user *) (uoss ? &koss : NULL),
266 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
268 ss_sp = (unsigned long) koss.ss_sp;
269 err |= __put_user(ss_sp, &uoss->ss_sp);
270 err |= __put_user(koss.ss_size, &uoss->ss_size);
271 err |= __put_user(koss.ss_flags, &uoss->ss_flags);
278 static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
280 _s390_regs_common32 regs32;
283 regs32.psw.mask = psw32_user_bits |
284 ((__u32)(regs->psw.mask >> 32) & PSW32_MASK_USER);
285 regs32.psw.addr = (__u32) regs->psw.addr |
286 (__u32)(regs->psw.mask & PSW_MASK_BA);
287 for (i = 0; i < NUM_GPRS; i++)
288 regs32.gprs[i] = (__u32) regs->gprs[i];
289 save_access_regs(current->thread.acrs);
290 memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
291 err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32));
294 save_fp_regs(¤t->thread.fp_regs);
295 /* s390_fp_regs and _s390_fp_regs32 are the same ! */
296 return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs,
297 sizeof(_s390_fp_regs32));
300 static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
302 _s390_regs_common32 regs32;
305 /* Alwys make any pending restarted system call return -EINTR */
306 current_thread_info()->restart_block.fn = do_no_restart_syscall;
308 err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32));
311 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
312 (__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
313 (__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
314 regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
315 for (i = 0; i < NUM_GPRS; i++)
316 regs->gprs[i] = (__u64) regs32.gprs[i];
317 memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
318 restore_access_regs(current->thread.acrs);
320 err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs,
321 sizeof(_s390_fp_regs32));
322 current->thread.fp_regs.fpc &= FPC_VALID_MASK;
326 restore_fp_regs(¤t->thread.fp_regs);
327 clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */
331 static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
333 __u32 gprs_high[NUM_GPRS];
336 for (i = 0; i < NUM_GPRS; i++)
337 gprs_high[i] = regs->gprs[i] >> 32;
339 return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
342 static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
344 __u32 gprs_high[NUM_GPRS];
347 err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
350 for (i = 0; i < NUM_GPRS; i++)
351 *(__u32 *)®s->gprs[i] = gprs_high[i];
355 asmlinkage long sys32_sigreturn(void)
357 struct pt_regs *regs = task_pt_regs(current);
358 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
361 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
363 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
365 set_current_blocked(&set);
366 if (restore_sigregs32(regs, &frame->sregs))
368 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
370 return regs->gprs[2];
372 force_sig(SIGSEGV, current);
376 asmlinkage long sys32_rt_sigreturn(void)
378 struct pt_regs *regs = task_pt_regs(current);
379 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
384 mm_segment_t old_fs = get_fs();
386 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
388 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
390 set_current_blocked(&set);
391 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
393 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
395 err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
396 st.ss_sp = compat_ptr(ss_sp);
397 err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
398 err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
402 do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
404 return regs->gprs[2];
406 force_sig(SIGSEGV, current);
411 * Set up a signal frame.
416 * Determine which stack to use..
418 static inline void __user *
419 get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
423 /* Default to using normal stack */
424 sp = (unsigned long) A(regs->gprs[15]);
426 /* Overflow on alternate signal stack gives SIGSEGV. */
427 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
428 return (void __user *) -1UL;
430 /* This is the X/Open sanctioned signal stack switching. */
431 if (ka->sa.sa_flags & SA_ONSTACK) {
432 if (! sas_ss_flags(sp))
433 sp = current->sas_ss_sp + current->sas_ss_size;
436 return (void __user *)((sp - frame_size) & -8ul);
439 static inline int map_signal(int sig)
441 if (current_thread_info()->exec_domain
442 && current_thread_info()->exec_domain->signal_invmap
444 return current_thread_info()->exec_domain->signal_invmap[sig];
449 static int setup_frame32(int sig, struct k_sigaction *ka,
450 sigset_t *set, struct pt_regs * regs)
452 sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
453 if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
456 if (frame == (void __user *) -1UL)
459 if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
462 if (save_sigregs32(regs, &frame->sregs))
464 if (save_sigregs_gprs_high(regs, frame->gprs_high))
466 if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
469 /* Set up to return from userspace. If provided, use a stub
470 already in userspace. */
471 if (ka->sa.sa_flags & SA_RESTORER) {
472 regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
474 regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
475 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
476 (u16 __force __user *)(frame->retcode)))
480 /* Set up backchain. */
481 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
484 /* Set up registers for signal handler */
485 regs->gprs[15] = (__force __u64) frame;
486 regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
487 regs->psw.addr = (__force __u64) ka->sa.sa_handler;
489 regs->gprs[2] = map_signal(sig);
490 regs->gprs[3] = (__force __u64) &frame->sc;
492 /* We forgot to include these in the sigcontext.
493 To avoid breaking binary compatibility, they are passed as args. */
494 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
495 sig == SIGTRAP || sig == SIGFPE) {
496 /* set extra registers only for synchronous signals */
497 regs->gprs[4] = regs->int_code & 127;
498 regs->gprs[5] = regs->int_parm_long;
501 /* Place signal number on stack to allow backtrace from handler. */
502 if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
507 force_sigsegv(sig, current);
511 static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
512 sigset_t *set, struct pt_regs * regs)
515 rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
516 if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
519 if (frame == (void __user *) -1UL)
522 if (copy_siginfo_to_user32(&frame->info, info))
525 /* Create the ucontext. */
526 err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
527 err |= __put_user(0, &frame->uc.uc_link);
528 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
529 err |= __put_user(sas_ss_flags(regs->gprs[15]),
530 &frame->uc.uc_stack.ss_flags);
531 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
532 err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
533 err |= save_sigregs_gprs_high(regs, frame->gprs_high);
534 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
538 /* Set up to return from userspace. If provided, use a stub
539 already in userspace. */
540 if (ka->sa.sa_flags & SA_RESTORER) {
541 regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
543 regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
544 err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
545 (u16 __force __user *)(frame->retcode));
548 /* Set up backchain. */
549 if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
552 /* Set up registers for signal handler */
553 regs->gprs[15] = (__force __u64) frame;
554 regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
555 regs->psw.addr = (__u64) ka->sa.sa_handler;
557 regs->gprs[2] = map_signal(sig);
558 regs->gprs[3] = (__force __u64) &frame->info;
559 regs->gprs[4] = (__force __u64) &frame->uc;
563 force_sigsegv(sig, current);
568 * OK, we're invoking a handler
571 void handle_signal32(unsigned long sig, struct k_sigaction *ka,
572 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
576 /* Set up the stack frame */
577 if (ka->sa.sa_flags & SA_SIGINFO)
578 ret = setup_rt_frame32(sig, ka, info, oldset, regs);
580 ret = setup_frame32(sig, ka, oldset, regs);
583 signal_delivered(sig, info, ka, regs,
584 test_thread_flag(TIF_SINGLE_STEP));