Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/signal32.c |
| 3 | * |
| 4 | * S390 version |
| 5 | * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 6 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 7 | * Gerhard Tonn (ton@de.ibm.com) |
| 8 | * |
| 9 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 10 | * |
| 11 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 12 | */ |
| 13 | |
| 14 | #include <linux/config.h> |
| 15 | #include <linux/compat.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/smp.h> |
| 19 | #include <linux/smp_lock.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/signal.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/wait.h> |
| 24 | #include <linux/ptrace.h> |
| 25 | #include <linux/unistd.h> |
| 26 | #include <linux/stddef.h> |
| 27 | #include <linux/tty.h> |
| 28 | #include <linux/personality.h> |
| 29 | #include <linux/binfmts.h> |
| 30 | #include <asm/ucontext.h> |
| 31 | #include <asm/uaccess.h> |
| 32 | #include <asm/lowcore.h> |
| 33 | #include "compat_linux.h" |
| 34 | #include "compat_ptrace.h" |
| 35 | |
| 36 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 37 | |
| 38 | typedef struct |
| 39 | { |
| 40 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; |
| 41 | struct sigcontext32 sc; |
| 42 | _sigregs32 sregs; |
| 43 | int signo; |
| 44 | __u8 retcode[S390_SYSCALL_SIZE]; |
| 45 | } sigframe32; |
| 46 | |
| 47 | typedef struct |
| 48 | { |
| 49 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; |
| 50 | __u8 retcode[S390_SYSCALL_SIZE]; |
| 51 | compat_siginfo_t info; |
| 52 | struct ucontext32 uc; |
| 53 | } rt_sigframe32; |
| 54 | |
| 55 | asmlinkage int FASTCALL(do_signal(struct pt_regs *regs, sigset_t *oldset)); |
| 56 | |
| 57 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) |
| 58 | { |
| 59 | int err; |
| 60 | |
| 61 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) |
| 62 | return -EFAULT; |
| 63 | |
| 64 | /* If you change siginfo_t structure, please be sure |
| 65 | this code is fixed accordingly. |
| 66 | It should never copy any pad contained in the structure |
| 67 | to avoid security leaks, but must copy the generic |
| 68 | 3 ints plus the relevant union member. |
| 69 | This routine must convert siginfo from 64bit to 32bit as well |
| 70 | at the same time. */ |
| 71 | err = __put_user(from->si_signo, &to->si_signo); |
| 72 | err |= __put_user(from->si_errno, &to->si_errno); |
| 73 | err |= __put_user((short)from->si_code, &to->si_code); |
| 74 | if (from->si_code < 0) |
| 75 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); |
| 76 | else { |
| 77 | switch (from->si_code >> 16) { |
| 78 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 79 | case __SI_MESGQ >> 16: |
| 80 | err |= __put_user(from->si_int, &to->si_int); |
| 81 | /* fallthrough */ |
| 82 | case __SI_KILL >> 16: |
| 83 | err |= __put_user(from->si_pid, &to->si_pid); |
| 84 | err |= __put_user(from->si_uid, &to->si_uid); |
| 85 | break; |
| 86 | case __SI_CHLD >> 16: |
| 87 | err |= __put_user(from->si_pid, &to->si_pid); |
| 88 | err |= __put_user(from->si_uid, &to->si_uid); |
| 89 | err |= __put_user(from->si_utime, &to->si_utime); |
| 90 | err |= __put_user(from->si_stime, &to->si_stime); |
| 91 | err |= __put_user(from->si_status, &to->si_status); |
| 92 | break; |
| 93 | case __SI_FAULT >> 16: |
| 94 | err |= __put_user((unsigned long) from->si_addr, |
| 95 | &to->si_addr); |
| 96 | break; |
| 97 | case __SI_POLL >> 16: |
| 98 | err |= __put_user(from->si_band, &to->si_band); |
| 99 | err |= __put_user(from->si_fd, &to->si_fd); |
| 100 | break; |
| 101 | case __SI_TIMER >> 16: |
| 102 | err |= __put_user(from->si_tid, &to->si_tid); |
| 103 | err |= __put_user(from->si_overrun, &to->si_overrun); |
| 104 | err |= __put_user(from->si_int, &to->si_int); |
| 105 | break; |
| 106 | default: |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | return err; |
| 111 | } |
| 112 | |
| 113 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
| 114 | { |
| 115 | int err; |
| 116 | u32 tmp; |
| 117 | |
| 118 | if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) |
| 119 | return -EFAULT; |
| 120 | |
| 121 | err = __get_user(to->si_signo, &from->si_signo); |
| 122 | err |= __get_user(to->si_errno, &from->si_errno); |
| 123 | err |= __get_user(to->si_code, &from->si_code); |
| 124 | |
| 125 | if (to->si_code < 0) |
| 126 | err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); |
| 127 | else { |
| 128 | switch (to->si_code >> 16) { |
| 129 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 130 | case __SI_MESGQ >> 16: |
| 131 | err |= __get_user(to->si_int, &from->si_int); |
| 132 | /* fallthrough */ |
| 133 | case __SI_KILL >> 16: |
| 134 | err |= __get_user(to->si_pid, &from->si_pid); |
| 135 | err |= __get_user(to->si_uid, &from->si_uid); |
| 136 | break; |
| 137 | case __SI_CHLD >> 16: |
| 138 | err |= __get_user(to->si_pid, &from->si_pid); |
| 139 | err |= __get_user(to->si_uid, &from->si_uid); |
| 140 | err |= __get_user(to->si_utime, &from->si_utime); |
| 141 | err |= __get_user(to->si_stime, &from->si_stime); |
| 142 | err |= __get_user(to->si_status, &from->si_status); |
| 143 | break; |
| 144 | case __SI_FAULT >> 16: |
| 145 | err |= __get_user(tmp, &from->si_addr); |
| 146 | to->si_addr = (void *)(u64) (tmp & PSW32_ADDR_INSN); |
| 147 | break; |
| 148 | case __SI_POLL >> 16: |
| 149 | err |= __get_user(to->si_band, &from->si_band); |
| 150 | err |= __get_user(to->si_fd, &from->si_fd); |
| 151 | break; |
| 152 | case __SI_TIMER >> 16: |
| 153 | err |= __get_user(to->si_tid, &from->si_tid); |
| 154 | err |= __get_user(to->si_overrun, &from->si_overrun); |
| 155 | err |= __get_user(to->si_int, &from->si_int); |
| 156 | break; |
| 157 | default: |
| 158 | break; |
| 159 | } |
| 160 | } |
| 161 | return err; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Atomically swap in the new signal mask, and wait for a signal. |
| 166 | */ |
| 167 | asmlinkage int |
| 168 | sys32_sigsuspend(struct pt_regs * regs,int history0, int history1, old_sigset_t mask) |
| 169 | { |
| 170 | sigset_t saveset; |
| 171 | |
| 172 | mask &= _BLOCKABLE; |
| 173 | spin_lock_irq(¤t->sighand->siglock); |
| 174 | saveset = current->blocked; |
| 175 | siginitset(¤t->blocked, mask); |
| 176 | recalc_sigpending(); |
| 177 | spin_unlock_irq(¤t->sighand->siglock); |
| 178 | regs->gprs[2] = -EINTR; |
| 179 | |
| 180 | while (1) { |
| 181 | set_current_state(TASK_INTERRUPTIBLE); |
| 182 | schedule(); |
| 183 | if (do_signal(regs, &saveset)) |
| 184 | return -EINTR; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | asmlinkage int |
| 189 | sys32_rt_sigsuspend(struct pt_regs * regs, compat_sigset_t __user *unewset, |
| 190 | size_t sigsetsize) |
| 191 | { |
| 192 | sigset_t saveset, newset; |
| 193 | compat_sigset_t set32; |
| 194 | |
| 195 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 196 | if (sigsetsize != sizeof(sigset_t)) |
| 197 | return -EINVAL; |
| 198 | |
| 199 | if (copy_from_user(&set32, unewset, sizeof(set32))) |
| 200 | return -EFAULT; |
| 201 | switch (_NSIG_WORDS) { |
| 202 | case 4: newset.sig[3] = set32.sig[6] + (((long)set32.sig[7]) << 32); |
| 203 | case 3: newset.sig[2] = set32.sig[4] + (((long)set32.sig[5]) << 32); |
| 204 | case 2: newset.sig[1] = set32.sig[2] + (((long)set32.sig[3]) << 32); |
| 205 | case 1: newset.sig[0] = set32.sig[0] + (((long)set32.sig[1]) << 32); |
| 206 | } |
| 207 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 208 | |
| 209 | spin_lock_irq(¤t->sighand->siglock); |
| 210 | saveset = current->blocked; |
| 211 | current->blocked = newset; |
| 212 | recalc_sigpending(); |
| 213 | spin_unlock_irq(¤t->sighand->siglock); |
| 214 | regs->gprs[2] = -EINTR; |
| 215 | |
| 216 | while (1) { |
| 217 | set_current_state(TASK_INTERRUPTIBLE); |
| 218 | schedule(); |
| 219 | if (do_signal(regs, &saveset)) |
| 220 | return -EINTR; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | asmlinkage long |
| 225 | sys32_sigaction(int sig, const struct old_sigaction32 __user *act, |
| 226 | struct old_sigaction32 __user *oact) |
| 227 | { |
| 228 | struct k_sigaction new_ka, old_ka; |
| 229 | unsigned long sa_handler, sa_restorer; |
| 230 | int ret; |
| 231 | |
| 232 | if (act) { |
| 233 | compat_old_sigset_t mask; |
| 234 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 235 | __get_user(sa_handler, &act->sa_handler) || |
| 236 | __get_user(sa_restorer, &act->sa_restorer)) |
| 237 | return -EFAULT; |
| 238 | new_ka.sa.sa_handler = (__sighandler_t) sa_handler; |
| 239 | new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer; |
| 240 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 241 | __get_user(mask, &act->sa_mask); |
| 242 | siginitset(&new_ka.sa.sa_mask, mask); |
| 243 | } |
| 244 | |
| 245 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 246 | |
| 247 | if (!ret && oact) { |
| 248 | sa_handler = (unsigned long) old_ka.sa.sa_handler; |
| 249 | sa_restorer = (unsigned long) old_ka.sa.sa_restorer; |
| 250 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 251 | __put_user(sa_handler, &oact->sa_handler) || |
| 252 | __put_user(sa_restorer, &oact->sa_restorer)) |
| 253 | return -EFAULT; |
| 254 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 255 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 256 | } |
| 257 | |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | int |
| 262 | do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact); |
| 263 | |
| 264 | asmlinkage long |
| 265 | sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, |
| 266 | struct sigaction32 __user *oact, size_t sigsetsize) |
| 267 | { |
| 268 | struct k_sigaction new_ka, old_ka; |
| 269 | unsigned long sa_handler; |
| 270 | int ret; |
| 271 | compat_sigset_t set32; |
| 272 | |
| 273 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 274 | if (sigsetsize != sizeof(compat_sigset_t)) |
| 275 | return -EINVAL; |
| 276 | |
| 277 | if (act) { |
| 278 | ret = get_user(sa_handler, &act->sa_handler); |
| 279 | ret |= __copy_from_user(&set32, &act->sa_mask, |
| 280 | sizeof(compat_sigset_t)); |
| 281 | switch (_NSIG_WORDS) { |
| 282 | case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6] |
| 283 | | (((long)set32.sig[7]) << 32); |
| 284 | case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4] |
| 285 | | (((long)set32.sig[5]) << 32); |
| 286 | case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2] |
| 287 | | (((long)set32.sig[3]) << 32); |
| 288 | case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0] |
| 289 | | (((long)set32.sig[1]) << 32); |
| 290 | } |
| 291 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 292 | |
| 293 | if (ret) |
| 294 | return -EFAULT; |
| 295 | new_ka.sa.sa_handler = (__sighandler_t) sa_handler; |
| 296 | } |
| 297 | |
| 298 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 299 | |
| 300 | if (!ret && oact) { |
| 301 | switch (_NSIG_WORDS) { |
| 302 | case 4: |
| 303 | set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32); |
| 304 | set32.sig[6] = old_ka.sa.sa_mask.sig[3]; |
| 305 | case 3: |
| 306 | set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32); |
| 307 | set32.sig[4] = old_ka.sa.sa_mask.sig[2]; |
| 308 | case 2: |
| 309 | set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32); |
| 310 | set32.sig[2] = old_ka.sa.sa_mask.sig[1]; |
| 311 | case 1: |
| 312 | set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32); |
| 313 | set32.sig[0] = old_ka.sa.sa_mask.sig[0]; |
| 314 | } |
| 315 | ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler); |
| 316 | ret |= __copy_to_user(&oact->sa_mask, &set32, |
| 317 | sizeof(compat_sigset_t)); |
| 318 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 319 | } |
| 320 | |
| 321 | return ret; |
| 322 | } |
| 323 | |
| 324 | asmlinkage long |
| 325 | sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss, |
| 326 | struct pt_regs *regs) |
| 327 | { |
| 328 | stack_t kss, koss; |
| 329 | unsigned long ss_sp; |
| 330 | int ret, err = 0; |
| 331 | mm_segment_t old_fs = get_fs(); |
| 332 | |
| 333 | if (uss) { |
| 334 | if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) |
| 335 | return -EFAULT; |
| 336 | err |= __get_user(ss_sp, &uss->ss_sp); |
| 337 | err |= __get_user(kss.ss_size, &uss->ss_size); |
| 338 | err |= __get_user(kss.ss_flags, &uss->ss_flags); |
| 339 | if (err) |
| 340 | return -EFAULT; |
| 341 | kss.ss_sp = (void *) ss_sp; |
| 342 | } |
| 343 | |
| 344 | set_fs (KERNEL_DS); |
| 345 | ret = do_sigaltstack((stack_t __user *) (uss ? &kss : NULL), |
| 346 | (stack_t __user *) (uoss ? &koss : NULL), |
| 347 | regs->gprs[15]); |
| 348 | set_fs (old_fs); |
| 349 | |
| 350 | if (!ret && uoss) { |
| 351 | if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) |
| 352 | return -EFAULT; |
| 353 | ss_sp = (unsigned long) koss.ss_sp; |
| 354 | err |= __put_user(ss_sp, &uoss->ss_sp); |
| 355 | err |= __put_user(koss.ss_size, &uoss->ss_size); |
| 356 | err |= __put_user(koss.ss_flags, &uoss->ss_flags); |
| 357 | if (err) |
| 358 | return -EFAULT; |
| 359 | } |
| 360 | return ret; |
| 361 | } |
| 362 | |
| 363 | static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs) |
| 364 | { |
| 365 | _s390_regs_common32 regs32; |
| 366 | int err, i; |
| 367 | |
| 368 | regs32.psw.mask = PSW32_MASK_MERGE(PSW32_USER_BITS, |
| 369 | (__u32)(regs->psw.mask >> 32)); |
| 370 | regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr; |
| 371 | for (i = 0; i < NUM_GPRS; i++) |
| 372 | regs32.gprs[i] = (__u32) regs->gprs[i]; |
| 373 | save_access_regs(current->thread.acrs); |
| 374 | memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs)); |
| 375 | err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32)); |
| 376 | if (err) |
| 377 | return err; |
| 378 | save_fp_regs(¤t->thread.fp_regs); |
| 379 | /* s390_fp_regs and _s390_fp_regs32 are the same ! */ |
| 380 | return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs, |
| 381 | sizeof(_s390_fp_regs32)); |
| 382 | } |
| 383 | |
| 384 | static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs) |
| 385 | { |
| 386 | _s390_regs_common32 regs32; |
| 387 | int err, i; |
| 388 | |
| 389 | /* Alwys make any pending restarted system call return -EINTR */ |
| 390 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 391 | |
| 392 | err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32)); |
| 393 | if (err) |
| 394 | return err; |
| 395 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
| 396 | (__u64)regs32.psw.mask << 32); |
| 397 | regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN); |
| 398 | for (i = 0; i < NUM_GPRS; i++) |
| 399 | regs->gprs[i] = (__u64) regs32.gprs[i]; |
| 400 | memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs)); |
| 401 | restore_access_regs(current->thread.acrs); |
| 402 | |
| 403 | err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs, |
| 404 | sizeof(_s390_fp_regs32)); |
| 405 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
| 406 | if (err) |
| 407 | return err; |
| 408 | |
| 409 | restore_fp_regs(¤t->thread.fp_regs); |
| 410 | regs->trap = -1; /* disable syscall checks */ |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) |
| 415 | { |
| 416 | sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15]; |
| 417 | sigset_t set; |
| 418 | |
| 419 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 420 | goto badframe; |
| 421 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32)) |
| 422 | goto badframe; |
| 423 | |
| 424 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 425 | spin_lock_irq(¤t->sighand->siglock); |
| 426 | current->blocked = set; |
| 427 | recalc_sigpending(); |
| 428 | spin_unlock_irq(¤t->sighand->siglock); |
| 429 | |
| 430 | if (restore_sigregs32(regs, &frame->sregs)) |
| 431 | goto badframe; |
| 432 | |
| 433 | return regs->gprs[2]; |
| 434 | |
| 435 | badframe: |
| 436 | force_sig(SIGSEGV, current); |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) |
| 441 | { |
| 442 | rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15]; |
| 443 | sigset_t set; |
| 444 | stack_t st; |
| 445 | __u32 ss_sp; |
| 446 | int err; |
| 447 | mm_segment_t old_fs = get_fs(); |
| 448 | |
| 449 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 450 | goto badframe; |
| 451 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 452 | goto badframe; |
| 453 | |
| 454 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 455 | spin_lock_irq(¤t->sighand->siglock); |
| 456 | current->blocked = set; |
| 457 | recalc_sigpending(); |
| 458 | spin_unlock_irq(¤t->sighand->siglock); |
| 459 | |
| 460 | if (restore_sigregs32(regs, &frame->uc.uc_mcontext)) |
| 461 | goto badframe; |
| 462 | |
| 463 | err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp); |
| 464 | st.ss_sp = (void *) A((unsigned long)ss_sp); |
| 465 | err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size); |
| 466 | err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags); |
| 467 | if (err) |
| 468 | goto badframe; |
| 469 | |
| 470 | /* It is more difficult to avoid calling this function than to |
| 471 | call it and ignore errors. */ |
| 472 | set_fs (KERNEL_DS); |
| 473 | do_sigaltstack((stack_t __user *)&st, NULL, regs->gprs[15]); |
| 474 | set_fs (old_fs); |
| 475 | |
| 476 | return regs->gprs[2]; |
| 477 | |
| 478 | badframe: |
| 479 | force_sig(SIGSEGV, current); |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * Set up a signal frame. |
| 485 | */ |
| 486 | |
| 487 | |
| 488 | /* |
| 489 | * Determine which stack to use.. |
| 490 | */ |
| 491 | static inline void __user * |
| 492 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) |
| 493 | { |
| 494 | unsigned long sp; |
| 495 | |
| 496 | /* Default to using normal stack */ |
| 497 | sp = (unsigned long) A(regs->gprs[15]); |
| 498 | |
| 499 | /* This is the X/Open sanctioned signal stack switching. */ |
| 500 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 501 | if (! on_sig_stack(sp)) |
| 502 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 503 | } |
| 504 | |
| 505 | /* This is the legacy signal stack switching. */ |
| 506 | else if (!user_mode(regs) && |
| 507 | !(ka->sa.sa_flags & SA_RESTORER) && |
| 508 | ka->sa.sa_restorer) { |
| 509 | sp = (unsigned long) ka->sa.sa_restorer; |
| 510 | } |
| 511 | |
| 512 | return (void __user *)((sp - frame_size) & -8ul); |
| 513 | } |
| 514 | |
| 515 | static inline int map_signal(int sig) |
| 516 | { |
| 517 | if (current_thread_info()->exec_domain |
| 518 | && current_thread_info()->exec_domain->signal_invmap |
| 519 | && sig < 32) |
| 520 | return current_thread_info()->exec_domain->signal_invmap[sig]; |
| 521 | else |
| 522 | return sig; |
| 523 | } |
| 524 | |
| 525 | static void setup_frame32(int sig, struct k_sigaction *ka, |
| 526 | sigset_t *set, struct pt_regs * regs) |
| 527 | { |
| 528 | sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32)); |
| 529 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32))) |
| 530 | goto give_sigsegv; |
| 531 | |
| 532 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32)) |
| 533 | goto give_sigsegv; |
| 534 | |
| 535 | if (save_sigregs32(regs, &frame->sregs)) |
| 536 | goto give_sigsegv; |
| 537 | if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs)) |
| 538 | goto give_sigsegv; |
| 539 | |
| 540 | /* Set up to return from userspace. If provided, use a stub |
| 541 | already in userspace. */ |
| 542 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 543 | regs->gprs[14] = (__u64) ka->sa.sa_restorer; |
| 544 | } else { |
| 545 | regs->gprs[14] = (__u64) frame->retcode; |
| 546 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, |
| 547 | (u16 __user *)(frame->retcode))) |
| 548 | goto give_sigsegv; |
| 549 | } |
| 550 | |
| 551 | /* Set up backchain. */ |
| 552 | if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) |
| 553 | goto give_sigsegv; |
| 554 | |
| 555 | /* Set up registers for signal handler */ |
| 556 | regs->gprs[15] = (__u64) frame; |
| 557 | regs->psw.addr = (__u64) ka->sa.sa_handler; |
| 558 | |
| 559 | regs->gprs[2] = map_signal(sig); |
| 560 | regs->gprs[3] = (__u64) &frame->sc; |
| 561 | |
| 562 | /* We forgot to include these in the sigcontext. |
| 563 | To avoid breaking binary compatibility, they are passed as args. */ |
| 564 | regs->gprs[4] = current->thread.trap_no; |
| 565 | regs->gprs[5] = current->thread.prot_addr; |
| 566 | |
| 567 | /* Place signal number on stack to allow backtrace from handler. */ |
| 568 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) |
| 569 | goto give_sigsegv; |
| 570 | return; |
| 571 | |
| 572 | give_sigsegv: |
| 573 | force_sigsegv(sig, current); |
| 574 | } |
| 575 | |
| 576 | static void setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 577 | sigset_t *set, struct pt_regs * regs) |
| 578 | { |
| 579 | int err = 0; |
| 580 | rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32)); |
| 581 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32))) |
| 582 | goto give_sigsegv; |
| 583 | |
| 584 | if (copy_siginfo_to_user32(&frame->info, info)) |
| 585 | goto give_sigsegv; |
| 586 | |
| 587 | /* Create the ucontext. */ |
| 588 | err |= __put_user(0, &frame->uc.uc_flags); |
| 589 | err |= __put_user(0, &frame->uc.uc_link); |
| 590 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
| 591 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
| 592 | &frame->uc.uc_stack.ss_flags); |
| 593 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 594 | err |= save_sigregs32(regs, &frame->uc.uc_mcontext); |
| 595 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 596 | if (err) |
| 597 | goto give_sigsegv; |
| 598 | |
| 599 | /* Set up to return from userspace. If provided, use a stub |
| 600 | already in userspace. */ |
| 601 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 602 | regs->gprs[14] = (__u64) ka->sa.sa_restorer; |
| 603 | } else { |
| 604 | regs->gprs[14] = (__u64) frame->retcode; |
| 605 | err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
| 606 | (u16 __user *)(frame->retcode)); |
| 607 | } |
| 608 | |
| 609 | /* Set up backchain. */ |
| 610 | if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) |
| 611 | goto give_sigsegv; |
| 612 | |
| 613 | /* Set up registers for signal handler */ |
| 614 | regs->gprs[15] = (__u64) frame; |
| 615 | regs->psw.addr = (__u64) ka->sa.sa_handler; |
| 616 | |
| 617 | regs->gprs[2] = map_signal(sig); |
| 618 | regs->gprs[3] = (__u64) &frame->info; |
| 619 | regs->gprs[4] = (__u64) &frame->uc; |
| 620 | return; |
| 621 | |
| 622 | give_sigsegv: |
| 623 | force_sigsegv(sig, current); |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * OK, we're invoking a handler |
| 628 | */ |
| 629 | |
| 630 | void |
| 631 | handle_signal32(unsigned long sig, struct k_sigaction *ka, |
| 632 | siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) |
| 633 | { |
| 634 | /* Set up the stack frame */ |
| 635 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 636 | setup_rt_frame32(sig, ka, info, oldset, regs); |
| 637 | else |
| 638 | setup_frame32(sig, ka, oldset, regs); |
| 639 | |
| 640 | if (!(ka->sa.sa_flags & SA_NODEFER)) { |
| 641 | spin_lock_irq(¤t->sighand->siglock); |
| 642 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 643 | sigaddset(¤t->blocked,sig); |
| 644 | recalc_sigpending(); |
| 645 | spin_unlock_irq(¤t->sighand->siglock); |
| 646 | } |
| 647 | } |
| 648 | |