Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/ia32/ia32_signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 7 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes |
| 8 | * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen |
| 9 | * |
| 10 | * $Id: ia32_signal.c,v 1.22 2002/07/29 10:34:03 ak Exp $ |
| 11 | */ |
| 12 | |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/mm.h> |
| 15 | #include <linux/smp.h> |
| 16 | #include <linux/smp_lock.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/personality.h> |
| 25 | #include <linux/compat.h> |
| 26 | #include <asm/ucontext.h> |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/i387.h> |
| 29 | #include <asm/ia32.h> |
| 30 | #include <asm/ptrace.h> |
| 31 | #include <asm/ia32_unistd.h> |
| 32 | #include <asm/user32.h> |
| 33 | #include <asm/sigcontext32.h> |
| 34 | #include <asm/fpu32.h> |
| 35 | #include <asm/proto.h> |
| 36 | #include <asm/vsyscall32.h> |
| 37 | |
| 38 | #define DEBUG_SIG 0 |
| 39 | |
| 40 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 41 | |
| 42 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); |
| 43 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where); |
| 44 | |
| 45 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) |
| 46 | { |
| 47 | int err; |
| 48 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) |
| 49 | return -EFAULT; |
| 50 | |
| 51 | /* If you change siginfo_t structure, please make sure that |
| 52 | this code is fixed accordingly. |
| 53 | It should never copy any pad contained in the structure |
| 54 | to avoid security leaks, but must copy the generic |
| 55 | 3 ints plus the relevant union member. */ |
| 56 | err = __put_user(from->si_signo, &to->si_signo); |
| 57 | err |= __put_user(from->si_errno, &to->si_errno); |
| 58 | err |= __put_user((short)from->si_code, &to->si_code); |
| 59 | |
| 60 | if (from->si_code < 0) { |
| 61 | err |= __put_user(from->si_pid, &to->si_pid); |
| 62 | err |= __put_user(from->si_uid, &to->si_uid); |
| 63 | err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr); |
| 64 | } else { |
| 65 | /* First 32bits of unions are always present: |
| 66 | * si_pid === si_band === si_tid === si_addr(LS half) */ |
| 67 | err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]); |
| 68 | switch (from->si_code >> 16) { |
| 69 | case __SI_FAULT >> 16: |
| 70 | break; |
| 71 | case __SI_CHLD >> 16: |
| 72 | err |= __put_user(from->si_utime, &to->si_utime); |
| 73 | err |= __put_user(from->si_stime, &to->si_stime); |
| 74 | err |= __put_user(from->si_status, &to->si_status); |
| 75 | /* FALL THROUGH */ |
| 76 | default: |
| 77 | case __SI_KILL >> 16: |
| 78 | err |= __put_user(from->si_uid, &to->si_uid); |
| 79 | break; |
| 80 | case __SI_POLL >> 16: |
| 81 | err |= __put_user(from->si_fd, &to->si_fd); |
| 82 | break; |
| 83 | case __SI_TIMER >> 16: |
| 84 | err |= __put_user(from->si_overrun, &to->si_overrun); |
| 85 | err |= __put_user(ptr_to_compat(from->si_ptr), |
| 86 | &to->si_ptr); |
| 87 | break; |
| 88 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 89 | case __SI_MESGQ >> 16: |
| 90 | err |= __put_user(from->si_uid, &to->si_uid); |
| 91 | err |= __put_user(from->si_int, &to->si_int); |
| 92 | break; |
| 93 | } |
| 94 | } |
| 95 | return err; |
| 96 | } |
| 97 | |
| 98 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
| 99 | { |
| 100 | int err; |
| 101 | u32 ptr32; |
| 102 | if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) |
| 103 | return -EFAULT; |
| 104 | |
| 105 | err = __get_user(to->si_signo, &from->si_signo); |
| 106 | err |= __get_user(to->si_errno, &from->si_errno); |
| 107 | err |= __get_user(to->si_code, &from->si_code); |
| 108 | |
| 109 | err |= __get_user(to->si_pid, &from->si_pid); |
| 110 | err |= __get_user(to->si_uid, &from->si_uid); |
| 111 | err |= __get_user(ptr32, &from->si_ptr); |
| 112 | to->si_ptr = compat_ptr(ptr32); |
| 113 | |
| 114 | return err; |
| 115 | } |
| 116 | |
| 117 | asmlinkage long |
| 118 | sys32_sigsuspend(int history0, int history1, old_sigset_t mask, |
| 119 | struct pt_regs *regs) |
| 120 | { |
| 121 | sigset_t saveset; |
| 122 | |
| 123 | mask &= _BLOCKABLE; |
| 124 | spin_lock_irq(¤t->sighand->siglock); |
| 125 | saveset = current->blocked; |
| 126 | siginitset(¤t->blocked, mask); |
| 127 | recalc_sigpending(); |
| 128 | spin_unlock_irq(¤t->sighand->siglock); |
| 129 | |
| 130 | regs->rax = -EINTR; |
| 131 | while (1) { |
| 132 | current->state = TASK_INTERRUPTIBLE; |
| 133 | schedule(); |
| 134 | if (do_signal(regs, &saveset)) |
| 135 | return -EINTR; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | asmlinkage long |
| 140 | sys32_sigaltstack(const stack_ia32_t __user *uss_ptr, |
| 141 | stack_ia32_t __user *uoss_ptr, |
| 142 | struct pt_regs *regs) |
| 143 | { |
| 144 | stack_t uss,uoss; |
| 145 | int ret; |
| 146 | mm_segment_t seg; |
| 147 | if (uss_ptr) { |
| 148 | u32 ptr; |
| 149 | memset(&uss,0,sizeof(stack_t)); |
| 150 | if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) || |
| 151 | __get_user(ptr, &uss_ptr->ss_sp) || |
| 152 | __get_user(uss.ss_flags, &uss_ptr->ss_flags) || |
| 153 | __get_user(uss.ss_size, &uss_ptr->ss_size)) |
| 154 | return -EFAULT; |
| 155 | uss.ss_sp = compat_ptr(ptr); |
| 156 | } |
| 157 | seg = get_fs(); |
| 158 | set_fs(KERNEL_DS); |
| 159 | ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp); |
| 160 | set_fs(seg); |
| 161 | if (ret >= 0 && uoss_ptr) { |
| 162 | if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) || |
| 163 | __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) || |
| 164 | __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) || |
| 165 | __put_user(uoss.ss_size, &uoss_ptr->ss_size)) |
| 166 | ret = -EFAULT; |
| 167 | } |
| 168 | return ret; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Do a signal return; undo the signal stack. |
| 173 | */ |
| 174 | |
| 175 | struct sigframe |
| 176 | { |
| 177 | u32 pretcode; |
| 178 | int sig; |
| 179 | struct sigcontext_ia32 sc; |
| 180 | struct _fpstate_ia32 fpstate; |
| 181 | unsigned int extramask[_COMPAT_NSIG_WORDS-1]; |
| 182 | char retcode[8]; |
| 183 | }; |
| 184 | |
| 185 | struct rt_sigframe |
| 186 | { |
| 187 | u32 pretcode; |
| 188 | int sig; |
| 189 | u32 pinfo; |
| 190 | u32 puc; |
| 191 | compat_siginfo_t info; |
| 192 | struct ucontext_ia32 uc; |
| 193 | struct _fpstate_ia32 fpstate; |
| 194 | char retcode[8]; |
| 195 | }; |
| 196 | |
| 197 | static int |
| 198 | ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned int *peax) |
| 199 | { |
| 200 | unsigned int err = 0; |
| 201 | |
| 202 | /* Always make any pending restarted system calls return -EINTR */ |
| 203 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 204 | |
| 205 | #if DEBUG_SIG |
| 206 | printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n", |
| 207 | sc, sc->err, sc->eip, sc->cs, sc->eflags); |
| 208 | #endif |
| 209 | #define COPY(x) { \ |
| 210 | unsigned int reg; \ |
| 211 | err |= __get_user(reg, &sc->e ##x); \ |
| 212 | regs->r ## x = reg; \ |
| 213 | } |
| 214 | |
| 215 | #define RELOAD_SEG(seg,mask) \ |
| 216 | { unsigned int cur; \ |
| 217 | unsigned short pre; \ |
| 218 | err |= __get_user(pre, &sc->seg); \ |
| 219 | asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \ |
| 220 | pre |= mask; \ |
| 221 | if (pre != cur) loadsegment(seg,pre); } |
| 222 | |
| 223 | /* Reload fs and gs if they have changed in the signal handler. |
| 224 | This does not handle long fs/gs base changes in the handler, but |
| 225 | does not clobber them at least in the normal case. */ |
| 226 | |
| 227 | { |
| 228 | unsigned gs, oldgs; |
| 229 | err |= __get_user(gs, &sc->gs); |
| 230 | gs |= 3; |
| 231 | asm("movl %%gs,%0" : "=r" (oldgs)); |
| 232 | if (gs != oldgs) |
| 233 | load_gs_index(gs); |
| 234 | } |
| 235 | RELOAD_SEG(fs,3); |
| 236 | RELOAD_SEG(ds,3); |
| 237 | RELOAD_SEG(es,3); |
| 238 | |
| 239 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
| 240 | COPY(dx); COPY(cx); COPY(ip); |
| 241 | /* Don't touch extended registers */ |
| 242 | |
| 243 | err |= __get_user(regs->cs, &sc->cs); |
| 244 | regs->cs |= 3; |
| 245 | err |= __get_user(regs->ss, &sc->ss); |
| 246 | regs->ss |= 3; |
| 247 | |
| 248 | { |
| 249 | unsigned int tmpflags; |
| 250 | err |= __get_user(tmpflags, &sc->eflags); |
| 251 | regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
| 252 | regs->orig_rax = -1; /* disable syscall checks */ |
| 253 | } |
| 254 | |
| 255 | { |
| 256 | u32 tmp; |
| 257 | struct _fpstate_ia32 __user * buf; |
| 258 | err |= __get_user(tmp, &sc->fpstate); |
| 259 | buf = compat_ptr(tmp); |
| 260 | if (buf) { |
| 261 | if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) |
| 262 | goto badframe; |
| 263 | err |= restore_i387_ia32(current, buf, 0); |
| 264 | } else { |
| 265 | struct task_struct *me = current; |
| 266 | if (used_math()) { |
| 267 | clear_fpu(me); |
| 268 | clear_used_math(); |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | { |
| 274 | u32 tmp; |
| 275 | err |= __get_user(tmp, &sc->eax); |
| 276 | *peax = tmp; |
| 277 | } |
| 278 | return err; |
| 279 | |
| 280 | badframe: |
| 281 | return 1; |
| 282 | } |
| 283 | |
| 284 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) |
| 285 | { |
| 286 | struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8); |
| 287 | sigset_t set; |
| 288 | unsigned int eax; |
| 289 | |
| 290 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 291 | goto badframe; |
| 292 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 293 | || (_COMPAT_NSIG_WORDS > 1 |
| 294 | && __copy_from_user((((char *) &set.sig) + 4), &frame->extramask, |
| 295 | sizeof(frame->extramask)))) |
| 296 | goto badframe; |
| 297 | |
| 298 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 299 | spin_lock_irq(¤t->sighand->siglock); |
| 300 | current->blocked = set; |
| 301 | recalc_sigpending(); |
| 302 | spin_unlock_irq(¤t->sighand->siglock); |
| 303 | |
| 304 | if (ia32_restore_sigcontext(regs, &frame->sc, &eax)) |
| 305 | goto badframe; |
| 306 | return eax; |
| 307 | |
| 308 | badframe: |
| 309 | signal_fault(regs, frame, "32bit sigreturn"); |
| 310 | return 0; |
| 311 | } |
| 312 | |
| 313 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) |
| 314 | { |
| 315 | struct rt_sigframe __user *frame; |
| 316 | sigset_t set; |
| 317 | unsigned int eax; |
| 318 | struct pt_regs tregs; |
| 319 | |
| 320 | frame = (struct rt_sigframe __user *)(regs->rsp - 4); |
| 321 | |
| 322 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 323 | goto badframe; |
| 324 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 325 | goto badframe; |
| 326 | |
| 327 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 328 | spin_lock_irq(¤t->sighand->siglock); |
| 329 | current->blocked = set; |
| 330 | recalc_sigpending(); |
| 331 | spin_unlock_irq(¤t->sighand->siglock); |
| 332 | |
| 333 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax)) |
| 334 | goto badframe; |
| 335 | |
| 336 | tregs = *regs; |
| 337 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) |
| 338 | goto badframe; |
| 339 | |
| 340 | return eax; |
| 341 | |
| 342 | badframe: |
| 343 | signal_fault(regs,frame,"32bit rt sigreturn"); |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Set up a signal frame. |
| 349 | */ |
| 350 | |
| 351 | static int |
| 352 | ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate, |
| 353 | struct pt_regs *regs, unsigned int mask) |
| 354 | { |
| 355 | int tmp, err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | tmp = 0; |
| 358 | __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp)); |
| 359 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); |
| 360 | __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp)); |
| 361 | err |= __put_user(tmp, (unsigned int __user *)&sc->fs); |
| 362 | __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp)); |
| 363 | err |= __put_user(tmp, (unsigned int __user *)&sc->ds); |
| 364 | __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp)); |
| 365 | err |= __put_user(tmp, (unsigned int __user *)&sc->es); |
| 366 | |
| 367 | err |= __put_user((u32)regs->rdi, &sc->edi); |
| 368 | err |= __put_user((u32)regs->rsi, &sc->esi); |
| 369 | err |= __put_user((u32)regs->rbp, &sc->ebp); |
| 370 | err |= __put_user((u32)regs->rsp, &sc->esp); |
| 371 | err |= __put_user((u32)regs->rbx, &sc->ebx); |
| 372 | err |= __put_user((u32)regs->rdx, &sc->edx); |
| 373 | err |= __put_user((u32)regs->rcx, &sc->ecx); |
| 374 | err |= __put_user((u32)regs->rax, &sc->eax); |
| 375 | err |= __put_user((u32)regs->cs, &sc->cs); |
| 376 | err |= __put_user((u32)regs->ss, &sc->ss); |
| 377 | err |= __put_user(current->thread.trap_no, &sc->trapno); |
| 378 | err |= __put_user(current->thread.error_code, &sc->err); |
| 379 | err |= __put_user((u32)regs->rip, &sc->eip); |
Peter Beutner | 4724e3e | 2006-01-11 22:43:18 +0100 | [diff] [blame] | 380 | err |= __put_user((u32)regs->eflags, &sc->eflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | err |= __put_user((u32)regs->rsp, &sc->esp_at_signal); |
| 382 | |
| 383 | tmp = save_i387_ia32(current, fpstate, regs, 0); |
| 384 | if (tmp < 0) |
| 385 | err = -EFAULT; |
| 386 | else { |
| 387 | clear_used_math(); |
| 388 | stts(); |
| 389 | err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL), |
| 390 | &sc->fpstate); |
| 391 | } |
| 392 | |
| 393 | /* non-iBCS2 extensions.. */ |
| 394 | err |= __put_user(mask, &sc->oldmask); |
| 395 | err |= __put_user(current->thread.cr2, &sc->cr2); |
| 396 | |
| 397 | return err; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Determine which stack to use.. |
| 402 | */ |
| 403 | static void __user * |
| 404 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) |
| 405 | { |
| 406 | unsigned long rsp; |
| 407 | |
| 408 | /* Default to using normal stack */ |
| 409 | rsp = regs->rsp; |
| 410 | |
| 411 | /* This is the X/Open sanctioned signal stack switching. */ |
| 412 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 413 | if (sas_ss_flags(rsp) == 0) |
| 414 | rsp = current->sas_ss_sp + current->sas_ss_size; |
| 415 | } |
| 416 | |
| 417 | /* This is the legacy signal stack switching. */ |
| 418 | else if ((regs->ss & 0xffff) != __USER_DS && |
| 419 | !(ka->sa.sa_flags & SA_RESTORER) && |
| 420 | ka->sa.sa_restorer) { |
| 421 | rsp = (unsigned long) ka->sa.sa_restorer; |
| 422 | } |
| 423 | |
Markus F.X.J. Oberhumer | d347f37 | 2005-10-09 18:54:23 +0200 | [diff] [blame] | 424 | rsp -= frame_size; |
| 425 | /* Align the stack pointer according to the i386 ABI, |
| 426 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ |
| 427 | rsp = ((rsp + 4) & -16ul) - 4; |
| 428 | return (void __user *) rsp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
| 430 | |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 431 | int ia32_setup_frame(int sig, struct k_sigaction *ka, |
| 432 | compat_sigset_t *set, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | { |
| 434 | struct sigframe __user *frame; |
| 435 | int err = 0; |
| 436 | |
| 437 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 438 | |
| 439 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 440 | goto give_sigsegv; |
| 441 | |
| 442 | { |
| 443 | struct exec_domain *ed = current_thread_info()->exec_domain; |
| 444 | err |= __put_user((ed |
| 445 | && ed->signal_invmap |
| 446 | && sig < 32 |
| 447 | ? ed->signal_invmap[sig] |
| 448 | : sig), |
| 449 | &frame->sig); |
| 450 | } |
| 451 | if (err) |
| 452 | goto give_sigsegv; |
| 453 | |
| 454 | err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, |
| 455 | set->sig[0]); |
| 456 | if (err) |
| 457 | goto give_sigsegv; |
| 458 | |
| 459 | if (_COMPAT_NSIG_WORDS > 1) { |
| 460 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 461 | sizeof(frame->extramask)); |
| 462 | } |
| 463 | if (err) |
| 464 | goto give_sigsegv; |
| 465 | |
| 466 | /* Return stub is in 32bit vsyscall page */ |
| 467 | { |
| 468 | void __user *restorer = VSYSCALL32_SIGRETURN; |
| 469 | if (ka->sa.sa_flags & SA_RESTORER) |
| 470 | restorer = ka->sa.sa_restorer; |
| 471 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
| 472 | } |
| 473 | /* These are actually not used anymore, but left because some |
| 474 | gdb versions depend on them as a marker. */ |
| 475 | { |
| 476 | /* copy_to_user optimizes that into a single 8 byte store */ |
| 477 | static const struct { |
| 478 | u16 poplmovl; |
| 479 | u32 val; |
| 480 | u16 int80; |
| 481 | u16 pad; |
| 482 | } __attribute__((packed)) code = { |
| 483 | 0xb858, /* popl %eax ; movl $...,%eax */ |
| 484 | __NR_ia32_sigreturn, |
| 485 | 0x80cd, /* int $0x80 */ |
| 486 | 0, |
| 487 | }; |
| 488 | err |= __copy_to_user(frame->retcode, &code, 8); |
| 489 | } |
| 490 | if (err) |
| 491 | goto give_sigsegv; |
| 492 | |
| 493 | /* Set up registers for signal handler */ |
| 494 | regs->rsp = (unsigned long) frame; |
| 495 | regs->rip = (unsigned long) ka->sa.sa_handler; |
| 496 | |
| 497 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); |
| 498 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); |
| 499 | |
| 500 | regs->cs = __USER32_CS; |
| 501 | regs->ss = __USER32_DS; |
| 502 | |
| 503 | set_fs(USER_DS); |
Peter Beutner | 4724e3e | 2006-01-11 22:43:18 +0100 | [diff] [blame] | 504 | regs->eflags &= ~TF_MASK; |
| 505 | if (test_thread_flag(TIF_SINGLESTEP)) |
| 506 | ptrace_notify(SIGTRAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | #if DEBUG_SIG |
| 509 | printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n", |
| 510 | current->comm, current->pid, frame, regs->rip, frame->pretcode); |
| 511 | #endif |
| 512 | |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 513 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
| 515 | give_sigsegv: |
| 516 | force_sigsegv(sig, current); |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 517 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 520 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 521 | compat_sigset_t *set, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
| 523 | struct rt_sigframe __user *frame; |
| 524 | int err = 0; |
| 525 | |
| 526 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 527 | |
| 528 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 529 | goto give_sigsegv; |
| 530 | |
| 531 | { |
| 532 | struct exec_domain *ed = current_thread_info()->exec_domain; |
| 533 | err |= __put_user((ed |
| 534 | && ed->signal_invmap |
| 535 | && sig < 32 |
| 536 | ? ed->signal_invmap[sig] |
| 537 | : sig), |
| 538 | &frame->sig); |
| 539 | } |
| 540 | err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo); |
| 541 | err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc); |
| 542 | err |= copy_siginfo_to_user32(&frame->info, info); |
| 543 | if (err) |
| 544 | goto give_sigsegv; |
| 545 | |
| 546 | /* Create the ucontext. */ |
| 547 | err |= __put_user(0, &frame->uc.uc_flags); |
| 548 | err |= __put_user(0, &frame->uc.uc_link); |
| 549 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
| 550 | err |= __put_user(sas_ss_flags(regs->rsp), |
| 551 | &frame->uc.uc_stack.ss_flags); |
| 552 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 553 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
| 554 | regs, set->sig[0]); |
| 555 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 556 | if (err) |
| 557 | goto give_sigsegv; |
| 558 | |
| 559 | |
| 560 | { |
| 561 | void __user *restorer = VSYSCALL32_RTSIGRETURN; |
| 562 | if (ka->sa.sa_flags & SA_RESTORER) |
| 563 | restorer = ka->sa.sa_restorer; |
| 564 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
| 565 | } |
| 566 | |
| 567 | /* This is movl $,%eax ; int $0x80 */ |
| 568 | /* Not actually used anymore, but left because some gdb versions |
| 569 | need it. */ |
| 570 | { |
| 571 | /* __copy_to_user optimizes that into a single 8 byte store */ |
| 572 | static const struct { |
| 573 | u8 movl; |
| 574 | u32 val; |
| 575 | u16 int80; |
| 576 | u16 pad; |
| 577 | u8 pad2; |
| 578 | } __attribute__((packed)) code = { |
| 579 | 0xb8, |
| 580 | __NR_ia32_rt_sigreturn, |
| 581 | 0x80cd, |
| 582 | 0, |
| 583 | }; |
| 584 | err |= __copy_to_user(frame->retcode, &code, 8); |
| 585 | } |
| 586 | if (err) |
| 587 | goto give_sigsegv; |
| 588 | |
| 589 | /* Set up registers for signal handler */ |
| 590 | regs->rsp = (unsigned long) frame; |
| 591 | regs->rip = (unsigned long) ka->sa.sa_handler; |
| 592 | |
| 593 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); |
| 594 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); |
| 595 | |
| 596 | regs->cs = __USER32_CS; |
| 597 | regs->ss = __USER32_DS; |
| 598 | |
| 599 | set_fs(USER_DS); |
Peter Beutner | 4724e3e | 2006-01-11 22:43:18 +0100 | [diff] [blame] | 600 | regs->eflags &= ~TF_MASK; |
| 601 | if (test_thread_flag(TIF_SINGLESTEP)) |
| 602 | ptrace_notify(SIGTRAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | #if DEBUG_SIG |
| 605 | printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n", |
| 606 | current->comm, current->pid, frame, regs->rip, frame->pretcode); |
| 607 | #endif |
| 608 | |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 609 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
| 611 | give_sigsegv: |
| 612 | force_sigsegv(sig, current); |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 613 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | } |