Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m32r/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (c) 2003 Hitoshi Yamamoto |
| 5 | * |
| 6 | * Taken from i386 version. |
| 7 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 8 | * |
| 9 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 10 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes |
| 11 | */ |
| 12 | |
| 13 | #include <linux/config.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/smp.h> |
| 17 | #include <linux/smp_lock.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/signal.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/wait.h> |
| 22 | #include <linux/unistd.h> |
| 23 | #include <linux/stddef.h> |
| 24 | #include <linux/personality.h> |
| 25 | #include <linux/suspend.h> |
| 26 | #include <asm/cacheflush.h> |
| 27 | #include <asm/ucontext.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | |
| 30 | #define DEBUG_SIG 0 |
| 31 | |
| 32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 33 | |
| 34 | int do_signal(struct pt_regs *, sigset_t *); |
| 35 | |
| 36 | asmlinkage int |
| 37 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, |
| 38 | unsigned long r2, unsigned long r3, unsigned long r4, |
| 39 | unsigned long r5, unsigned long r6, struct pt_regs regs) |
| 40 | { |
| 41 | sigset_t saveset, newset; |
| 42 | |
| 43 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 44 | if (sigsetsize != sizeof(sigset_t)) |
| 45 | return -EINVAL; |
| 46 | |
| 47 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
| 48 | return -EFAULT; |
| 49 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 50 | |
| 51 | spin_lock_irq(¤t->sighand->siglock); |
| 52 | saveset = current->blocked; |
| 53 | current->blocked = newset; |
| 54 | recalc_sigpending(); |
| 55 | spin_unlock_irq(¤t->sighand->siglock); |
| 56 | |
| 57 | regs.r0 = -EINTR; |
| 58 | while (1) { |
| 59 | current->state = TASK_INTERRUPTIBLE; |
| 60 | schedule(); |
| 61 | if (do_signal(®s, &saveset)) |
| 62 | return regs.r0; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | asmlinkage int |
| 67 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
| 68 | unsigned long r2, unsigned long r3, unsigned long r4, |
| 69 | unsigned long r5, unsigned long r6, struct pt_regs regs) |
| 70 | { |
| 71 | return do_sigaltstack(uss, uoss, regs.spu); |
| 72 | } |
| 73 | |
| 74 | |
| 75 | /* |
| 76 | * Do a signal return; undo the signal stack. |
| 77 | */ |
| 78 | |
| 79 | struct rt_sigframe |
| 80 | { |
| 81 | int sig; |
| 82 | struct siginfo *pinfo; |
| 83 | void *puc; |
| 84 | struct siginfo info; |
| 85 | struct ucontext uc; |
| 86 | // struct _fpstate fpstate; |
| 87 | }; |
| 88 | |
| 89 | static int |
| 90 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, |
| 91 | int *r0_p) |
| 92 | { |
| 93 | unsigned int err = 0; |
| 94 | |
| 95 | /* Always make any pending restarted system calls return -EINTR */ |
| 96 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 97 | |
| 98 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) |
| 99 | COPY(r4); |
| 100 | COPY(r5); |
| 101 | COPY(r6); |
| 102 | COPY(pt_regs); |
| 103 | /* COPY(r0); Skip r0 */ |
| 104 | COPY(r1); |
| 105 | COPY(r2); |
| 106 | COPY(r3); |
| 107 | COPY(r7); |
| 108 | COPY(r8); |
| 109 | COPY(r9); |
| 110 | COPY(r10); |
| 111 | COPY(r11); |
| 112 | COPY(r12); |
| 113 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) |
| 114 | COPY(acc0h); |
| 115 | COPY(acc0l); |
| 116 | COPY(acc1h); |
| 117 | COPY(acc1l); |
| 118 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) |
| 119 | COPY(acch); |
| 120 | COPY(accl); |
| 121 | #else |
| 122 | #error unknown isa configuration |
| 123 | #endif |
| 124 | COPY(psw); |
| 125 | COPY(bpc); |
| 126 | COPY(bbpsw); |
| 127 | COPY(bbpc); |
| 128 | COPY(spu); |
| 129 | COPY(fp); |
| 130 | COPY(lr); |
| 131 | COPY(spi); |
| 132 | #undef COPY |
| 133 | |
| 134 | regs->syscall_nr = -1; /* disable syscall checks */ |
| 135 | err |= __get_user(*r0_p, &sc->sc_r0); |
| 136 | |
| 137 | return err; |
| 138 | } |
| 139 | |
| 140 | asmlinkage int |
| 141 | sys_rt_sigreturn(unsigned long r0, unsigned long r1, |
| 142 | unsigned long r2, unsigned long r3, unsigned long r4, |
| 143 | unsigned long r5, unsigned long r6, struct pt_regs regs) |
| 144 | { |
| 145 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.spu; |
| 146 | sigset_t set; |
| 147 | stack_t st; |
| 148 | int result; |
| 149 | |
| 150 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 151 | goto badframe; |
| 152 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 153 | goto badframe; |
| 154 | |
| 155 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 156 | spin_lock_irq(¤t->sighand->siglock); |
| 157 | current->blocked = set; |
| 158 | recalc_sigpending(); |
| 159 | spin_unlock_irq(¤t->sighand->siglock); |
| 160 | |
| 161 | if (restore_sigcontext(®s, &frame->uc.uc_mcontext, &result)) |
| 162 | goto badframe; |
| 163 | |
| 164 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) |
| 165 | goto badframe; |
| 166 | /* It is more difficult to avoid calling this function than to |
| 167 | call it and ignore errors. */ |
| 168 | do_sigaltstack(&st, NULL, regs.spu); |
| 169 | |
| 170 | return result; |
| 171 | |
| 172 | badframe: |
| 173 | force_sig(SIGSEGV, current); |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Set up a signal frame. |
| 179 | */ |
| 180 | |
| 181 | static int |
| 182 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 183 | unsigned long mask) |
| 184 | { |
| 185 | int err = 0; |
| 186 | |
| 187 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
| 188 | COPY(r4); |
| 189 | COPY(r5); |
| 190 | COPY(r6); |
| 191 | COPY(pt_regs); |
| 192 | COPY(r0); |
| 193 | COPY(r1); |
| 194 | COPY(r2); |
| 195 | COPY(r3); |
| 196 | COPY(r7); |
| 197 | COPY(r8); |
| 198 | COPY(r9); |
| 199 | COPY(r10); |
| 200 | COPY(r11); |
| 201 | COPY(r12); |
| 202 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) |
| 203 | COPY(acc0h); |
| 204 | COPY(acc0l); |
| 205 | COPY(acc1h); |
| 206 | COPY(acc1l); |
| 207 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) |
| 208 | COPY(acch); |
| 209 | COPY(accl); |
| 210 | #else |
| 211 | #error unknown isa configuration |
| 212 | #endif |
| 213 | COPY(psw); |
| 214 | COPY(bpc); |
| 215 | COPY(bbpsw); |
| 216 | COPY(bbpc); |
| 217 | COPY(spu); |
| 218 | COPY(fp); |
| 219 | COPY(lr); |
| 220 | COPY(spi); |
| 221 | #undef COPY |
| 222 | |
| 223 | err |= __put_user(mask, &sc->oldmask); |
| 224 | |
| 225 | return err; |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Determine which stack to use.. |
| 230 | */ |
| 231 | static inline void __user * |
| 232 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 233 | { |
| 234 | /* This is the X/Open sanctioned signal stack switching. */ |
| 235 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 236 | if (sas_ss_flags(sp) == 0) |
| 237 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 238 | } |
| 239 | |
| 240 | return (void __user *)((sp - frame_size) & -8ul); |
| 241 | } |
| 242 | |
| 243 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 244 | sigset_t *set, struct pt_regs *regs) |
| 245 | { |
| 246 | struct rt_sigframe __user *frame; |
| 247 | int err = 0; |
| 248 | int signal; |
| 249 | |
| 250 | frame = get_sigframe(ka, regs->spu, sizeof(*frame)); |
| 251 | |
| 252 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 253 | goto give_sigsegv; |
| 254 | |
| 255 | signal = current_thread_info()->exec_domain |
| 256 | && current_thread_info()->exec_domain->signal_invmap |
| 257 | && sig < 32 |
| 258 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 259 | : sig; |
| 260 | |
| 261 | err |= __put_user(signal, &frame->sig); |
| 262 | if (err) |
| 263 | goto give_sigsegv; |
| 264 | |
| 265 | err |= __put_user(&frame->info, &frame->pinfo); |
| 266 | err |= __put_user(&frame->uc, &frame->puc); |
| 267 | err |= copy_siginfo_to_user(&frame->info, info); |
| 268 | if (err) |
| 269 | goto give_sigsegv; |
| 270 | |
| 271 | /* Create the ucontext. */ |
| 272 | err |= __put_user(0, &frame->uc.uc_flags); |
| 273 | err |= __put_user(0, &frame->uc.uc_link); |
| 274 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
| 275 | err |= __put_user(sas_ss_flags(regs->spu), |
| 276 | &frame->uc.uc_stack.ss_flags); |
| 277 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 278 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); |
| 279 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 280 | if (err) |
| 281 | goto give_sigsegv; |
| 282 | |
| 283 | /* Set up to return from userspace. */ |
| 284 | regs->lr = (unsigned long)ka->sa.sa_restorer; |
| 285 | |
| 286 | /* Set up registers for signal handler */ |
| 287 | regs->spu = (unsigned long)frame; |
| 288 | regs->r0 = signal; /* Arg for signal handler */ |
| 289 | regs->r1 = (unsigned long)&frame->info; |
| 290 | regs->r2 = (unsigned long)&frame->uc; |
| 291 | regs->bpc = (unsigned long)ka->sa.sa_handler; |
| 292 | |
| 293 | set_fs(USER_DS); |
| 294 | |
| 295 | #if DEBUG_SIG |
| 296 | printk("SIG deliver (%s:%d): sp=%p pc=%p\n", |
| 297 | current->comm, current->pid, frame, regs->pc); |
| 298 | #endif |
| 299 | |
| 300 | return; |
| 301 | |
| 302 | give_sigsegv: |
| 303 | force_sigsegv(sig, current); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * OK, we're invoking a handler |
| 308 | */ |
| 309 | |
| 310 | static void |
| 311 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
| 312 | sigset_t *oldset, struct pt_regs *regs) |
| 313 | { |
| 314 | unsigned short inst; |
| 315 | |
| 316 | /* Are we from a system call? */ |
| 317 | if (regs->syscall_nr >= 0) { |
| 318 | /* If so, check system call restarting.. */ |
| 319 | switch (regs->r0) { |
| 320 | case -ERESTART_RESTARTBLOCK: |
| 321 | case -ERESTARTNOHAND: |
| 322 | regs->r0 = -EINTR; |
| 323 | break; |
| 324 | |
| 325 | case -ERESTARTSYS: |
| 326 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 327 | regs->r0 = -EINTR; |
| 328 | break; |
| 329 | } |
| 330 | /* fallthrough */ |
| 331 | case -ERESTARTNOINTR: |
| 332 | regs->r0 = regs->orig_r0; |
| 333 | inst = *(unsigned short *)(regs->bpc - 2); |
| 334 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ |
| 335 | regs->bpc -= 2; |
| 336 | else |
| 337 | regs->bpc -= 4; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* Set up the stack frame */ |
| 342 | setup_rt_frame(sig, ka, info, oldset, regs); |
| 343 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 344 | spin_lock_irq(¤t->sighand->siglock); |
| 345 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 346 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | sigaddset(¤t->blocked,sig); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 348 | recalc_sigpending(); |
| 349 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 354 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 355 | * mistake. |
| 356 | */ |
| 357 | int do_signal(struct pt_regs *regs, sigset_t *oldset) |
| 358 | { |
| 359 | siginfo_t info; |
| 360 | int signr; |
| 361 | struct k_sigaction ka; |
| 362 | unsigned short inst; |
| 363 | |
| 364 | /* |
| 365 | * We want the common case to go fast, which |
| 366 | * is why we may in certain cases get here from |
| 367 | * kernel mode. Just return without doing anything |
| 368 | * if so. |
| 369 | */ |
| 370 | if (!user_mode(regs)) |
| 371 | return 1; |
| 372 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 373 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | goto no_signal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
| 376 | if (!oldset) |
| 377 | oldset = ¤t->blocked; |
| 378 | |
| 379 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 380 | if (signr > 0) { |
| 381 | /* Reenable any watchpoints before delivering the |
| 382 | * signal to user space. The processor register will |
| 383 | * have been cleared if the watchpoint triggered |
| 384 | * inside the kernel. |
| 385 | */ |
| 386 | |
| 387 | /* Whee! Actually deliver the signal. */ |
| 388 | handle_signal(signr, &ka, &info, oldset, regs); |
| 389 | return 1; |
| 390 | } |
| 391 | |
| 392 | no_signal: |
| 393 | /* Did we come from a system call? */ |
| 394 | if (regs->syscall_nr >= 0) { |
| 395 | /* Restart the system call - no handlers present */ |
| 396 | if (regs->r0 == -ERESTARTNOHAND || |
| 397 | regs->r0 == -ERESTARTSYS || |
| 398 | regs->r0 == -ERESTARTNOINTR) { |
| 399 | regs->r0 = regs->orig_r0; |
| 400 | inst = *(unsigned short *)(regs->bpc - 2); |
| 401 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ |
| 402 | regs->bpc -= 2; |
| 403 | else |
| 404 | regs->bpc -= 4; |
| 405 | } |
| 406 | if (regs->r0 == -ERESTART_RESTARTBLOCK){ |
| 407 | regs->r0 = regs->orig_r0; |
| 408 | regs->r7 = __NR_restart_syscall; |
| 409 | inst = *(unsigned short *)(regs->bpc - 2); |
| 410 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ |
| 411 | regs->bpc -= 2; |
| 412 | else |
| 413 | regs->bpc -= 4; |
| 414 | } |
| 415 | } |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * notification of userspace execution resumption |
| 421 | * - triggered by current->work.notify_resume |
| 422 | */ |
| 423 | void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, |
| 424 | __u32 thread_info_flags) |
| 425 | { |
| 426 | /* Pending single-step? */ |
| 427 | if (thread_info_flags & _TIF_SINGLESTEP) |
| 428 | clear_thread_flag(TIF_SINGLESTEP); |
| 429 | |
| 430 | /* deal with pending signal delivery */ |
| 431 | if (thread_info_flags & _TIF_SIGPENDING) |
| 432 | do_signal(regs,oldset); |
| 433 | |
| 434 | clear_thread_flag(TIF_IRET); |
| 435 | } |