Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/signal.c |
| 3 | * |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 4 | * Copyright (C) IBM Corp. 1999,2006 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 6 | * |
| 7 | * Based on Intel version |
| 8 | * |
| 9 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 10 | * |
| 11 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 12 | */ |
| 13 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/sched.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 30 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 33 | |
| 34 | |
| 35 | typedef struct |
| 36 | { |
| 37 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; |
| 38 | struct sigcontext sc; |
| 39 | _sigregs sregs; |
| 40 | int signo; |
| 41 | __u8 retcode[S390_SYSCALL_SIZE]; |
| 42 | } sigframe; |
| 43 | |
| 44 | typedef struct |
| 45 | { |
| 46 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; |
| 47 | __u8 retcode[S390_SYSCALL_SIZE]; |
| 48 | struct siginfo info; |
| 49 | struct ucontext uc; |
| 50 | } rt_sigframe; |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* |
| 53 | * Atomically swap in the new signal mask, and wait for a signal. |
| 54 | */ |
| 55 | asmlinkage int |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 56 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | mask &= _BLOCKABLE; |
| 59 | spin_lock_irq(¤t->sighand->siglock); |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 60 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | siginitset(¤t->blocked, mask); |
| 62 | recalc_sigpending(); |
| 63 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 65 | current->state = TASK_INTERRUPTIBLE; |
| 66 | schedule(); |
| 67 | set_thread_flag(TIF_RESTORE_SIGMASK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 69 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | asmlinkage long |
| 73 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 74 | struct old_sigaction __user *oact) |
| 75 | { |
| 76 | struct k_sigaction new_ka, old_ka; |
| 77 | int ret; |
| 78 | |
| 79 | if (act) { |
| 80 | old_sigset_t mask; |
| 81 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 82 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
Heiko Carstens | 12bae23 | 2006-10-27 12:39:22 +0200 | [diff] [blame] | 83 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
| 84 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || |
| 85 | __get_user(mask, &act->sa_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | siginitset(&new_ka.sa.sa_mask, mask); |
| 88 | } |
| 89 | |
| 90 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 91 | |
| 92 | if (!ret && oact) { |
| 93 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 94 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
Heiko Carstens | 12bae23 | 2006-10-27 12:39:22 +0200 | [diff] [blame] | 95 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
| 96 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || |
| 97 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | asmlinkage long |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 105 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 107 | struct pt_regs *regs = task_pt_regs(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return do_sigaltstack(uss, uoss, regs->gprs[15]); |
| 109 | } |
| 110 | |
| 111 | |
| 112 | |
| 113 | /* Returns non-zero on fault. */ |
| 114 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) |
| 115 | { |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 116 | _sigregs user_sregs; |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | save_access_regs(current->thread.acrs); |
| 119 | |
| 120 | /* Copy a 'clean' PSW mask to the user to avoid leaking |
| 121 | information about whether PER is currently on. */ |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 122 | user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask); |
Martin Schwidefsky | b05e370 | 2006-10-04 20:01:58 +0200 | [diff] [blame] | 123 | user_sregs.regs.psw.addr = regs->psw.addr; |
| 124 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 125 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
| 126 | sizeof(sregs->regs.acrs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | /* |
| 128 | * We have to store the fp registers to current->thread.fp_regs |
| 129 | * to merge them with the emulated registers. |
| 130 | */ |
| 131 | save_fp_regs(¤t->thread.fp_regs); |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 132 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
| 133 | sizeof(s390_fp_regs)); |
| 134 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* Returns positive number on error */ |
| 138 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) |
| 139 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | int err; |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 141 | _sigregs user_sregs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | /* Alwys make any pending restarted system call return -EINTR */ |
| 144 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 145 | |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 146 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (err) |
| 148 | return err; |
Martin Schwidefsky | b05e370 | 2006-10-04 20:01:58 +0200 | [diff] [blame] | 149 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
| 150 | user_sregs.regs.psw.mask); |
| 151 | regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr; |
| 152 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 153 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
| 154 | sizeof(sregs->regs.acrs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | restore_access_regs(current->thread.acrs); |
| 156 | |
Gerald Schaefer | 6837a8c | 2006-09-20 15:59:39 +0200 | [diff] [blame] | 157 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
| 158 | sizeof(s390_fp_regs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | restore_fp_regs(¤t->thread.fp_regs); |
| 162 | regs->trap = -1; /* disable syscall checks */ |
| 163 | return 0; |
| 164 | } |
| 165 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 166 | asmlinkage long sys_sigreturn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 168 | struct pt_regs *regs = task_pt_regs(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; |
| 170 | sigset_t set; |
| 171 | |
| 172 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 173 | goto badframe; |
| 174 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) |
| 175 | goto badframe; |
| 176 | |
| 177 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 178 | spin_lock_irq(¤t->sighand->siglock); |
| 179 | current->blocked = set; |
| 180 | recalc_sigpending(); |
| 181 | spin_unlock_irq(¤t->sighand->siglock); |
| 182 | |
| 183 | if (restore_sigregs(regs, &frame->sregs)) |
| 184 | goto badframe; |
| 185 | |
| 186 | return regs->gprs[2]; |
| 187 | |
| 188 | badframe: |
| 189 | force_sig(SIGSEGV, current); |
| 190 | return 0; |
| 191 | } |
| 192 | |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 193 | asmlinkage long sys_rt_sigreturn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
Martin Schwidefsky | 03ff9a2 | 2007-04-27 16:01:40 +0200 | [diff] [blame] | 195 | struct pt_regs *regs = task_pt_regs(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
| 197 | sigset_t set; |
| 198 | |
| 199 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 200 | goto badframe; |
| 201 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) |
| 202 | goto badframe; |
| 203 | |
| 204 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 205 | spin_lock_irq(¤t->sighand->siglock); |
| 206 | current->blocked = set; |
| 207 | recalc_sigpending(); |
| 208 | spin_unlock_irq(¤t->sighand->siglock); |
| 209 | |
| 210 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) |
| 211 | goto badframe; |
| 212 | |
Cedric Le Goater | 4e3df37 | 2006-01-06 00:19:10 -0800 | [diff] [blame] | 213 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
| 214 | regs->gprs[15]) == -EFAULT) |
| 215 | goto badframe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | return regs->gprs[2]; |
| 217 | |
| 218 | badframe: |
| 219 | force_sig(SIGSEGV, current); |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Set up a signal frame. |
| 225 | */ |
| 226 | |
| 227 | |
| 228 | /* |
| 229 | * Determine which stack to use.. |
| 230 | */ |
| 231 | static inline void __user * |
| 232 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) |
| 233 | { |
| 234 | unsigned long sp; |
| 235 | |
| 236 | /* Default to using normal stack */ |
| 237 | sp = regs->gprs[15]; |
| 238 | |
Heiko Carstens | de55343 | 2008-04-17 07:45:57 +0200 | [diff] [blame] | 239 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
| 240 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) |
| 241 | return (void __user *) -1UL; |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | /* This is the X/Open sanctioned signal stack switching. */ |
| 244 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 245 | if (! sas_ss_flags(sp)) |
| 246 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 247 | } |
| 248 | |
| 249 | /* This is the legacy signal stack switching. */ |
| 250 | else if (!user_mode(regs) && |
| 251 | !(ka->sa.sa_flags & SA_RESTORER) && |
| 252 | ka->sa.sa_restorer) { |
| 253 | sp = (unsigned long) ka->sa.sa_restorer; |
| 254 | } |
| 255 | |
| 256 | return (void __user *)((sp - frame_size) & -8ul); |
| 257 | } |
| 258 | |
| 259 | static inline int map_signal(int sig) |
| 260 | { |
| 261 | if (current_thread_info()->exec_domain |
| 262 | && current_thread_info()->exec_domain->signal_invmap |
| 263 | && sig < 32) |
| 264 | return current_thread_info()->exec_domain->signal_invmap[sig]; |
| 265 | else |
| 266 | return sig; |
| 267 | } |
| 268 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 269 | static int setup_frame(int sig, struct k_sigaction *ka, |
| 270 | sigset_t *set, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
| 272 | sigframe __user *frame; |
| 273 | |
| 274 | frame = get_sigframe(ka, regs, sizeof(sigframe)); |
| 275 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) |
| 276 | goto give_sigsegv; |
| 277 | |
Heiko Carstens | de55343 | 2008-04-17 07:45:57 +0200 | [diff] [blame] | 278 | if (frame == (void __user *) -1UL) |
| 279 | goto give_sigsegv; |
| 280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
| 282 | goto give_sigsegv; |
| 283 | |
| 284 | if (save_sigregs(regs, &frame->sregs)) |
| 285 | goto give_sigsegv; |
| 286 | if (__put_user(&frame->sregs, &frame->sc.sregs)) |
| 287 | goto give_sigsegv; |
| 288 | |
| 289 | /* Set up to return from userspace. If provided, use a stub |
| 290 | already in userspace. */ |
| 291 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 292 | regs->gprs[14] = (unsigned long) |
| 293 | ka->sa.sa_restorer | PSW_ADDR_AMODE; |
| 294 | } else { |
| 295 | regs->gprs[14] = (unsigned long) |
| 296 | frame->retcode | PSW_ADDR_AMODE; |
| 297 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, |
| 298 | (u16 __user *)(frame->retcode))) |
| 299 | goto give_sigsegv; |
| 300 | } |
| 301 | |
| 302 | /* Set up backchain. */ |
| 303 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) |
| 304 | goto give_sigsegv; |
| 305 | |
| 306 | /* Set up registers for signal handler */ |
| 307 | regs->gprs[15] = (unsigned long) frame; |
| 308 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; |
| 309 | |
| 310 | regs->gprs[2] = map_signal(sig); |
| 311 | regs->gprs[3] = (unsigned long) &frame->sc; |
| 312 | |
| 313 | /* We forgot to include these in the sigcontext. |
| 314 | To avoid breaking binary compatibility, they are passed as args. */ |
| 315 | regs->gprs[4] = current->thread.trap_no; |
| 316 | regs->gprs[5] = current->thread.prot_addr; |
| 317 | |
| 318 | /* Place signal number on stack to allow backtrace from handler. */ |
| 319 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) |
| 320 | goto give_sigsegv; |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 321 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | give_sigsegv: |
| 324 | force_sigsegv(sig, current); |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 325 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
| 327 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 328 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | sigset_t *set, struct pt_regs * regs) |
| 330 | { |
| 331 | int err = 0; |
| 332 | rt_sigframe __user *frame; |
| 333 | |
| 334 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); |
| 335 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) |
| 336 | goto give_sigsegv; |
| 337 | |
Heiko Carstens | de55343 | 2008-04-17 07:45:57 +0200 | [diff] [blame] | 338 | if (frame == (void __user *) -1UL) |
| 339 | goto give_sigsegv; |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | if (copy_siginfo_to_user(&frame->info, info)) |
| 342 | goto give_sigsegv; |
| 343 | |
| 344 | /* Create the ucontext. */ |
| 345 | err |= __put_user(0, &frame->uc.uc_flags); |
Al Viro | c281447 | 2005-09-29 00:16:02 +0100 | [diff] [blame] | 346 | err |= __put_user(NULL, &frame->uc.uc_link); |
| 347 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
| 349 | &frame->uc.uc_stack.ss_flags); |
| 350 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 351 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); |
| 352 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 353 | if (err) |
| 354 | goto give_sigsegv; |
| 355 | |
| 356 | /* Set up to return from userspace. If provided, use a stub |
| 357 | already in userspace. */ |
| 358 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 359 | regs->gprs[14] = (unsigned long) |
| 360 | ka->sa.sa_restorer | PSW_ADDR_AMODE; |
| 361 | } else { |
| 362 | regs->gprs[14] = (unsigned long) |
| 363 | frame->retcode | PSW_ADDR_AMODE; |
Heiko Carstens | b44df33 | 2006-05-01 12:16:15 -0700 | [diff] [blame] | 364 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
| 365 | (u16 __user *)(frame->retcode))) |
| 366 | goto give_sigsegv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | /* Set up backchain. */ |
| 370 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) |
| 371 | goto give_sigsegv; |
| 372 | |
| 373 | /* Set up registers for signal handler */ |
| 374 | regs->gprs[15] = (unsigned long) frame; |
| 375 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; |
| 376 | |
| 377 | regs->gprs[2] = map_signal(sig); |
| 378 | regs->gprs[3] = (unsigned long) &frame->info; |
| 379 | regs->gprs[4] = (unsigned long) &frame->uc; |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 380 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | give_sigsegv: |
| 383 | force_sigsegv(sig, current); |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 384 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* |
| 388 | * OK, we're invoking a handler |
| 389 | */ |
| 390 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 391 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | handle_signal(unsigned long sig, struct k_sigaction *ka, |
| 393 | siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) |
| 394 | { |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 395 | int ret; |
| 396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | /* Set up the stack frame */ |
| 398 | if (ka->sa.sa_flags & SA_SIGINFO) |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 399 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | else |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 401 | ret = setup_frame(sig, ka, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 403 | if (ret == 0) { |
| 404 | spin_lock_irq(¤t->sighand->siglock); |
| 405 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 406 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
| 407 | sigaddset(¤t->blocked,sig); |
| 408 | recalc_sigpending(); |
| 409 | spin_unlock_irq(¤t->sighand->siglock); |
| 410 | } |
| 411 | |
| 412 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 417 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 418 | * mistake. |
| 419 | * |
| 420 | * Note that we go through the signals twice: once to check the signals that |
| 421 | * the kernel can handle, and then we build all the user-level signal handling |
| 422 | * stack-frames in one go after that. |
| 423 | */ |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 424 | void do_signal(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | { |
| 426 | unsigned long retval = 0, continue_addr = 0, restart_addr = 0; |
| 427 | siginfo_t info; |
| 428 | int signr; |
| 429 | struct k_sigaction ka; |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 430 | sigset_t *oldset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | /* |
| 433 | * We want the common case to go fast, which |
| 434 | * is why we may in certain cases get here from |
| 435 | * kernel mode. Just return without doing anything |
| 436 | * if so. |
| 437 | */ |
| 438 | if (!user_mode(regs)) |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 439 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 441 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 442 | oldset = ¤t->saved_sigmask; |
| 443 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | oldset = ¤t->blocked; |
| 445 | |
| 446 | /* Are we from a system call? */ |
| 447 | if (regs->trap == __LC_SVC_OLD_PSW) { |
| 448 | continue_addr = regs->psw.addr; |
| 449 | restart_addr = continue_addr - regs->ilc; |
| 450 | retval = regs->gprs[2]; |
| 451 | |
| 452 | /* Prepare for system call restart. We do this here so that a |
| 453 | debugger will see the already changed PSW. */ |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 454 | switch (retval) { |
| 455 | case -ERESTARTNOHAND: |
| 456 | case -ERESTARTSYS: |
| 457 | case -ERESTARTNOINTR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | regs->gprs[2] = regs->orig_gpr2; |
| 459 | regs->psw.addr = restart_addr; |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 460 | break; |
| 461 | case -ERESTART_RESTARTBLOCK: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | regs->gprs[2] = -EINTR; |
| 463 | } |
Heiko Carstens | 8427082 | 2006-09-20 15:58:54 +0200 | [diff] [blame] | 464 | regs->trap = -1; /* Don't deal with this again. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | /* Get signal to deliver. When running under ptrace, at this point |
| 468 | the debugger may change all our registers ... */ |
| 469 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 470 | |
| 471 | /* Depending on the signal settings we may need to revert the |
| 472 | decision to restart the system call. */ |
| 473 | if (signr > 0 && regs->psw.addr == restart_addr) { |
| 474 | if (retval == -ERESTARTNOHAND |
| 475 | || (retval == -ERESTARTSYS |
| 476 | && !(current->sighand->action[signr-1].sa.sa_flags |
| 477 | & SA_RESTART))) { |
| 478 | regs->gprs[2] = -EINTR; |
| 479 | regs->psw.addr = continue_addr; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | if (signr > 0) { |
| 484 | /* Whee! Actually deliver the signal. */ |
Roland McGrath | 0ac30be | 2008-01-26 14:11:22 +0100 | [diff] [blame] | 485 | int ret; |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 486 | #ifdef CONFIG_COMPAT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | if (test_thread_flag(TIF_31BIT)) { |
Roland McGrath | 0ac30be | 2008-01-26 14:11:22 +0100 | [diff] [blame] | 488 | ret = handle_signal32(signr, &ka, &info, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | } |
Roland McGrath | 0ac30be | 2008-01-26 14:11:22 +0100 | [diff] [blame] | 490 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | #endif |
Roland McGrath | 0ac30be | 2008-01-26 14:11:22 +0100 | [diff] [blame] | 492 | ret = handle_signal(signr, &ka, &info, oldset, regs); |
| 493 | if (!ret) { |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 494 | /* |
| 495 | * A signal was successfully delivered; the saved |
| 496 | * sigmask will have been stored in the signal frame, |
| 497 | * and will be restored by sigreturn, so we can simply |
| 498 | * clear the TIF_RESTORE_SIGMASK flag. |
| 499 | */ |
| 500 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 501 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
Roland McGrath | 0ac30be | 2008-01-26 14:11:22 +0100 | [diff] [blame] | 502 | |
| 503 | /* |
| 504 | * If we would have taken a single-step trap |
| 505 | * for a normal instruction, act like we took |
| 506 | * one for the handler setup. |
| 507 | */ |
| 508 | if (current->thread.per_info.single_step) |
| 509 | set_thread_flag(TIF_SINGLE_STEP); |
Heiko Carstens | 54dfe5dd | 2006-02-01 03:06:38 -0800 | [diff] [blame] | 510 | } |
| 511 | return; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * If there's no signal to deliver, we just put the saved sigmask back. |
| 516 | */ |
| 517 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 518 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 519 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | /* Restart a different system call. */ |
| 523 | if (retval == -ERESTART_RESTARTBLOCK |
| 524 | && regs->psw.addr == continue_addr) { |
| 525 | regs->gprs[2] = __NR_restart_syscall; |
| 526 | set_thread_flag(TIF_RESTART_SVC); |
| 527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |