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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/smp.h> |
| 14 | #include <linux/smp_lock.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/signal.h> |
| 17 | #include <linux/errno.h> |
| 18 | #include <linux/wait.h> |
| 19 | #include <linux/ptrace.h> |
| 20 | #include <linux/unistd.h> |
| 21 | #include <linux/stddef.h> |
| 22 | #include <linux/personality.h> |
| 23 | #include <linux/compat.h> |
Andi Kleen | 9fbbd4d | 2007-02-13 13:26:26 +0100 | [diff] [blame^] | 24 | #include <linux/binfmts.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/ucontext.h> |
| 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/i387.h> |
| 28 | #include <asm/ia32.h> |
| 29 | #include <asm/ptrace.h> |
| 30 | #include <asm/ia32_unistd.h> |
| 31 | #include <asm/user32.h> |
| 32 | #include <asm/sigcontext32.h> |
| 33 | #include <asm/fpu32.h> |
| 34 | #include <asm/proto.h> |
| 35 | #include <asm/vsyscall32.h> |
| 36 | |
| 37 | #define DEBUG_SIG 0 |
| 38 | |
| 39 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 40 | |
| 41 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); |
| 42 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where); |
| 43 | |
| 44 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) |
| 45 | { |
| 46 | int err; |
| 47 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) |
| 48 | return -EFAULT; |
| 49 | |
| 50 | /* If you change siginfo_t structure, please make sure that |
| 51 | this code is fixed accordingly. |
| 52 | It should never copy any pad contained in the structure |
| 53 | to avoid security leaks, but must copy the generic |
| 54 | 3 ints plus the relevant union member. */ |
| 55 | err = __put_user(from->si_signo, &to->si_signo); |
| 56 | err |= __put_user(from->si_errno, &to->si_errno); |
| 57 | err |= __put_user((short)from->si_code, &to->si_code); |
| 58 | |
| 59 | if (from->si_code < 0) { |
| 60 | err |= __put_user(from->si_pid, &to->si_pid); |
| 61 | err |= __put_user(from->si_uid, &to->si_uid); |
| 62 | err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr); |
| 63 | } else { |
| 64 | /* First 32bits of unions are always present: |
| 65 | * si_pid === si_band === si_tid === si_addr(LS half) */ |
| 66 | err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]); |
| 67 | switch (from->si_code >> 16) { |
| 68 | case __SI_FAULT >> 16: |
| 69 | break; |
| 70 | case __SI_CHLD >> 16: |
| 71 | err |= __put_user(from->si_utime, &to->si_utime); |
| 72 | err |= __put_user(from->si_stime, &to->si_stime); |
| 73 | err |= __put_user(from->si_status, &to->si_status); |
| 74 | /* FALL THROUGH */ |
| 75 | default: |
| 76 | case __SI_KILL >> 16: |
| 77 | err |= __put_user(from->si_uid, &to->si_uid); |
| 78 | break; |
| 79 | case __SI_POLL >> 16: |
| 80 | err |= __put_user(from->si_fd, &to->si_fd); |
| 81 | break; |
| 82 | case __SI_TIMER >> 16: |
| 83 | err |= __put_user(from->si_overrun, &to->si_overrun); |
| 84 | err |= __put_user(ptr_to_compat(from->si_ptr), |
| 85 | &to->si_ptr); |
| 86 | break; |
| 87 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 88 | case __SI_MESGQ >> 16: |
| 89 | err |= __put_user(from->si_uid, &to->si_uid); |
| 90 | err |= __put_user(from->si_int, &to->si_int); |
| 91 | break; |
| 92 | } |
| 93 | } |
| 94 | return err; |
| 95 | } |
| 96 | |
| 97 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
| 98 | { |
| 99 | int err; |
| 100 | u32 ptr32; |
| 101 | if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) |
| 102 | return -EFAULT; |
| 103 | |
| 104 | err = __get_user(to->si_signo, &from->si_signo); |
| 105 | err |= __get_user(to->si_errno, &from->si_errno); |
| 106 | err |= __get_user(to->si_code, &from->si_code); |
| 107 | |
| 108 | err |= __get_user(to->si_pid, &from->si_pid); |
| 109 | err |= __get_user(to->si_uid, &from->si_uid); |
| 110 | err |= __get_user(ptr32, &from->si_ptr); |
| 111 | to->si_ptr = compat_ptr(ptr32); |
| 112 | |
| 113 | return err; |
| 114 | } |
| 115 | |
| 116 | asmlinkage long |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 117 | sys32_sigsuspend(int history0, int history1, old_sigset_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | mask &= _BLOCKABLE; |
| 120 | spin_lock_irq(¤t->sighand->siglock); |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 121 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | siginitset(¤t->blocked, mask); |
| 123 | recalc_sigpending(); |
| 124 | spin_unlock_irq(¤t->sighand->siglock); |
| 125 | |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 126 | current->state = TASK_INTERRUPTIBLE; |
| 127 | schedule(); |
| 128 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 129 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | asmlinkage long |
| 133 | sys32_sigaltstack(const stack_ia32_t __user *uss_ptr, |
| 134 | stack_ia32_t __user *uoss_ptr, |
| 135 | struct pt_regs *regs) |
| 136 | { |
| 137 | stack_t uss,uoss; |
| 138 | int ret; |
| 139 | mm_segment_t seg; |
| 140 | if (uss_ptr) { |
| 141 | u32 ptr; |
| 142 | memset(&uss,0,sizeof(stack_t)); |
| 143 | if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) || |
| 144 | __get_user(ptr, &uss_ptr->ss_sp) || |
| 145 | __get_user(uss.ss_flags, &uss_ptr->ss_flags) || |
| 146 | __get_user(uss.ss_size, &uss_ptr->ss_size)) |
| 147 | return -EFAULT; |
| 148 | uss.ss_sp = compat_ptr(ptr); |
| 149 | } |
| 150 | seg = get_fs(); |
| 151 | set_fs(KERNEL_DS); |
| 152 | ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp); |
| 153 | set_fs(seg); |
| 154 | if (ret >= 0 && uoss_ptr) { |
| 155 | if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) || |
| 156 | __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) || |
| 157 | __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) || |
| 158 | __put_user(uoss.ss_size, &uoss_ptr->ss_size)) |
| 159 | ret = -EFAULT; |
| 160 | } |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Do a signal return; undo the signal stack. |
| 166 | */ |
| 167 | |
| 168 | struct sigframe |
| 169 | { |
| 170 | u32 pretcode; |
| 171 | int sig; |
| 172 | struct sigcontext_ia32 sc; |
| 173 | struct _fpstate_ia32 fpstate; |
| 174 | unsigned int extramask[_COMPAT_NSIG_WORDS-1]; |
| 175 | char retcode[8]; |
| 176 | }; |
| 177 | |
| 178 | struct rt_sigframe |
| 179 | { |
| 180 | u32 pretcode; |
| 181 | int sig; |
| 182 | u32 pinfo; |
| 183 | u32 puc; |
| 184 | compat_siginfo_t info; |
| 185 | struct ucontext_ia32 uc; |
| 186 | struct _fpstate_ia32 fpstate; |
| 187 | char retcode[8]; |
| 188 | }; |
| 189 | |
| 190 | static int |
| 191 | ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned int *peax) |
| 192 | { |
| 193 | unsigned int err = 0; |
| 194 | |
| 195 | /* Always make any pending restarted system calls return -EINTR */ |
| 196 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 197 | |
| 198 | #if DEBUG_SIG |
| 199 | printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n", |
| 200 | sc, sc->err, sc->eip, sc->cs, sc->eflags); |
| 201 | #endif |
| 202 | #define COPY(x) { \ |
| 203 | unsigned int reg; \ |
| 204 | err |= __get_user(reg, &sc->e ##x); \ |
| 205 | regs->r ## x = reg; \ |
| 206 | } |
| 207 | |
| 208 | #define RELOAD_SEG(seg,mask) \ |
| 209 | { unsigned int cur; \ |
| 210 | unsigned short pre; \ |
| 211 | err |= __get_user(pre, &sc->seg); \ |
| 212 | asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \ |
| 213 | pre |= mask; \ |
| 214 | if (pre != cur) loadsegment(seg,pre); } |
| 215 | |
| 216 | /* Reload fs and gs if they have changed in the signal handler. |
| 217 | This does not handle long fs/gs base changes in the handler, but |
| 218 | does not clobber them at least in the normal case. */ |
| 219 | |
| 220 | { |
| 221 | unsigned gs, oldgs; |
| 222 | err |= __get_user(gs, &sc->gs); |
| 223 | gs |= 3; |
| 224 | asm("movl %%gs,%0" : "=r" (oldgs)); |
| 225 | if (gs != oldgs) |
| 226 | load_gs_index(gs); |
| 227 | } |
| 228 | RELOAD_SEG(fs,3); |
| 229 | RELOAD_SEG(ds,3); |
| 230 | RELOAD_SEG(es,3); |
| 231 | |
| 232 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
| 233 | COPY(dx); COPY(cx); COPY(ip); |
| 234 | /* Don't touch extended registers */ |
| 235 | |
| 236 | err |= __get_user(regs->cs, &sc->cs); |
| 237 | regs->cs |= 3; |
| 238 | err |= __get_user(regs->ss, &sc->ss); |
| 239 | regs->ss |= 3; |
| 240 | |
| 241 | { |
| 242 | unsigned int tmpflags; |
| 243 | err |= __get_user(tmpflags, &sc->eflags); |
| 244 | regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
| 245 | regs->orig_rax = -1; /* disable syscall checks */ |
| 246 | } |
| 247 | |
| 248 | { |
| 249 | u32 tmp; |
| 250 | struct _fpstate_ia32 __user * buf; |
| 251 | err |= __get_user(tmp, &sc->fpstate); |
| 252 | buf = compat_ptr(tmp); |
| 253 | if (buf) { |
| 254 | if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) |
| 255 | goto badframe; |
| 256 | err |= restore_i387_ia32(current, buf, 0); |
| 257 | } else { |
| 258 | struct task_struct *me = current; |
| 259 | if (used_math()) { |
| 260 | clear_fpu(me); |
| 261 | clear_used_math(); |
| 262 | } |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | { |
| 267 | u32 tmp; |
| 268 | err |= __get_user(tmp, &sc->eax); |
| 269 | *peax = tmp; |
| 270 | } |
| 271 | return err; |
| 272 | |
| 273 | badframe: |
| 274 | return 1; |
| 275 | } |
| 276 | |
| 277 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) |
| 278 | { |
| 279 | struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8); |
| 280 | sigset_t set; |
| 281 | unsigned int eax; |
| 282 | |
| 283 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 284 | goto badframe; |
| 285 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 286 | || (_COMPAT_NSIG_WORDS > 1 |
| 287 | && __copy_from_user((((char *) &set.sig) + 4), &frame->extramask, |
| 288 | sizeof(frame->extramask)))) |
| 289 | goto badframe; |
| 290 | |
| 291 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 292 | spin_lock_irq(¤t->sighand->siglock); |
| 293 | current->blocked = set; |
| 294 | recalc_sigpending(); |
| 295 | spin_unlock_irq(¤t->sighand->siglock); |
| 296 | |
| 297 | if (ia32_restore_sigcontext(regs, &frame->sc, &eax)) |
| 298 | goto badframe; |
| 299 | return eax; |
| 300 | |
| 301 | badframe: |
| 302 | signal_fault(regs, frame, "32bit sigreturn"); |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) |
| 307 | { |
| 308 | struct rt_sigframe __user *frame; |
| 309 | sigset_t set; |
| 310 | unsigned int eax; |
| 311 | struct pt_regs tregs; |
| 312 | |
| 313 | frame = (struct rt_sigframe __user *)(regs->rsp - 4); |
| 314 | |
| 315 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 316 | goto badframe; |
| 317 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 318 | goto badframe; |
| 319 | |
| 320 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 321 | spin_lock_irq(¤t->sighand->siglock); |
| 322 | current->blocked = set; |
| 323 | recalc_sigpending(); |
| 324 | spin_unlock_irq(¤t->sighand->siglock); |
| 325 | |
| 326 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax)) |
| 327 | goto badframe; |
| 328 | |
| 329 | tregs = *regs; |
| 330 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) |
| 331 | goto badframe; |
| 332 | |
| 333 | return eax; |
| 334 | |
| 335 | badframe: |
| 336 | signal_fault(regs,frame,"32bit rt sigreturn"); |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Set up a signal frame. |
| 342 | */ |
| 343 | |
| 344 | static int |
| 345 | ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate, |
| 346 | struct pt_regs *regs, unsigned int mask) |
| 347 | { |
| 348 | int tmp, err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | tmp = 0; |
| 351 | __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp)); |
| 352 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); |
| 353 | __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp)); |
| 354 | err |= __put_user(tmp, (unsigned int __user *)&sc->fs); |
| 355 | __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp)); |
| 356 | err |= __put_user(tmp, (unsigned int __user *)&sc->ds); |
| 357 | __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp)); |
| 358 | err |= __put_user(tmp, (unsigned int __user *)&sc->es); |
| 359 | |
| 360 | err |= __put_user((u32)regs->rdi, &sc->edi); |
| 361 | err |= __put_user((u32)regs->rsi, &sc->esi); |
| 362 | err |= __put_user((u32)regs->rbp, &sc->ebp); |
| 363 | err |= __put_user((u32)regs->rsp, &sc->esp); |
| 364 | err |= __put_user((u32)regs->rbx, &sc->ebx); |
| 365 | err |= __put_user((u32)regs->rdx, &sc->edx); |
| 366 | err |= __put_user((u32)regs->rcx, &sc->ecx); |
| 367 | err |= __put_user((u32)regs->rax, &sc->eax); |
| 368 | err |= __put_user((u32)regs->cs, &sc->cs); |
| 369 | err |= __put_user((u32)regs->ss, &sc->ss); |
| 370 | err |= __put_user(current->thread.trap_no, &sc->trapno); |
| 371 | err |= __put_user(current->thread.error_code, &sc->err); |
| 372 | err |= __put_user((u32)regs->rip, &sc->eip); |
Peter Beutner | 4724e3e | 2006-01-11 22:43:18 +0100 | [diff] [blame] | 373 | err |= __put_user((u32)regs->eflags, &sc->eflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | err |= __put_user((u32)regs->rsp, &sc->esp_at_signal); |
| 375 | |
| 376 | tmp = save_i387_ia32(current, fpstate, regs, 0); |
| 377 | if (tmp < 0) |
| 378 | err = -EFAULT; |
| 379 | else { |
| 380 | clear_used_math(); |
| 381 | stts(); |
| 382 | err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL), |
| 383 | &sc->fpstate); |
| 384 | } |
| 385 | |
| 386 | /* non-iBCS2 extensions.. */ |
| 387 | err |= __put_user(mask, &sc->oldmask); |
| 388 | err |= __put_user(current->thread.cr2, &sc->cr2); |
| 389 | |
| 390 | return err; |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * Determine which stack to use.. |
| 395 | */ |
| 396 | static void __user * |
| 397 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) |
| 398 | { |
| 399 | unsigned long rsp; |
| 400 | |
| 401 | /* Default to using normal stack */ |
| 402 | rsp = regs->rsp; |
| 403 | |
| 404 | /* This is the X/Open sanctioned signal stack switching. */ |
| 405 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 406 | if (sas_ss_flags(rsp) == 0) |
| 407 | rsp = current->sas_ss_sp + current->sas_ss_size; |
| 408 | } |
| 409 | |
| 410 | /* This is the legacy signal stack switching. */ |
| 411 | else if ((regs->ss & 0xffff) != __USER_DS && |
| 412 | !(ka->sa.sa_flags & SA_RESTORER) && |
| 413 | ka->sa.sa_restorer) { |
| 414 | rsp = (unsigned long) ka->sa.sa_restorer; |
| 415 | } |
| 416 | |
Markus F.X.J. Oberhumer | d347f37 | 2005-10-09 18:54:23 +0200 | [diff] [blame] | 417 | rsp -= frame_size; |
| 418 | /* Align the stack pointer according to the i386 ABI, |
| 419 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ |
| 420 | rsp = ((rsp + 4) & -16ul) - 4; |
| 421 | return (void __user *) rsp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | } |
| 423 | |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 424 | int ia32_setup_frame(int sig, struct k_sigaction *ka, |
| 425 | compat_sigset_t *set, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
| 427 | struct sigframe __user *frame; |
| 428 | int err = 0; |
| 429 | |
| 430 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 431 | |
| 432 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 433 | goto give_sigsegv; |
| 434 | |
Andi Kleen | dd54a11 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 435 | err |= __put_user(sig, &frame->sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (err) |
| 437 | goto give_sigsegv; |
| 438 | |
| 439 | err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, |
| 440 | set->sig[0]); |
| 441 | if (err) |
| 442 | goto give_sigsegv; |
| 443 | |
| 444 | if (_COMPAT_NSIG_WORDS > 1) { |
| 445 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 446 | sizeof(frame->extramask)); |
| 447 | } |
| 448 | if (err) |
| 449 | goto give_sigsegv; |
| 450 | |
| 451 | /* Return stub is in 32bit vsyscall page */ |
| 452 | { |
Andi Kleen | 9fbbd4d | 2007-02-13 13:26:26 +0100 | [diff] [blame^] | 453 | void __user *restorer; |
| 454 | if (current->binfmt->hasvdso) |
| 455 | restorer = VSYSCALL32_SIGRETURN; |
| 456 | else |
| 457 | restorer = (void *)&frame->retcode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (ka->sa.sa_flags & SA_RESTORER) |
| 459 | restorer = ka->sa.sa_restorer; |
| 460 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
| 461 | } |
| 462 | /* These are actually not used anymore, but left because some |
| 463 | gdb versions depend on them as a marker. */ |
| 464 | { |
| 465 | /* copy_to_user optimizes that into a single 8 byte store */ |
| 466 | static const struct { |
| 467 | u16 poplmovl; |
| 468 | u32 val; |
| 469 | u16 int80; |
| 470 | u16 pad; |
| 471 | } __attribute__((packed)) code = { |
| 472 | 0xb858, /* popl %eax ; movl $...,%eax */ |
| 473 | __NR_ia32_sigreturn, |
| 474 | 0x80cd, /* int $0x80 */ |
| 475 | 0, |
| 476 | }; |
| 477 | err |= __copy_to_user(frame->retcode, &code, 8); |
| 478 | } |
| 479 | if (err) |
| 480 | goto give_sigsegv; |
| 481 | |
| 482 | /* Set up registers for signal handler */ |
| 483 | regs->rsp = (unsigned long) frame; |
| 484 | regs->rip = (unsigned long) ka->sa.sa_handler; |
| 485 | |
Andi Kleen | 536e3ee | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 486 | /* Make -mregparm=3 work */ |
| 487 | regs->rax = sig; |
| 488 | regs->rdx = 0; |
| 489 | regs->rcx = 0; |
| 490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); |
| 492 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); |
| 493 | |
| 494 | regs->cs = __USER32_CS; |
| 495 | regs->ss = __USER32_DS; |
| 496 | |
| 497 | set_fs(USER_DS); |
Andi Kleen | ab2e0b4 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 498 | regs->eflags &= ~TF_MASK; |
| 499 | if (test_thread_flag(TIF_SINGLESTEP)) |
| 500 | ptrace_notify(SIGTRAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | #if DEBUG_SIG |
Evgeniy Polyakov | 8469add | 2007-02-13 13:26:25 +0100 | [diff] [blame] | 503 | printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | current->comm, current->pid, frame, regs->rip, frame->pretcode); |
| 505 | #endif |
| 506 | |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 507 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | give_sigsegv: |
| 510 | force_sigsegv(sig, current); |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 511 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
| 513 | |
Roland McGrath | 0928d6e | 2005-06-23 00:08:37 -0700 | [diff] [blame] | 514 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 515 | compat_sigset_t *set, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
| 517 | struct rt_sigframe __user *frame; |
| 518 | int err = 0; |
| 519 | |
| 520 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 521 | |
| 522 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 523 | goto give_sigsegv; |
| 524 | |
| 525 | { |
| 526 | struct exec_domain *ed = current_thread_info()->exec_domain; |
| 527 | err |= __put_user((ed |
| 528 | && ed->signal_invmap |
| 529 | && sig < 32 |
| 530 | ? ed->signal_invmap[sig] |
| 531 | : sig), |
| 532 | &frame->sig); |
| 533 | } |
| 534 | err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo); |
| 535 | err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc); |
| 536 | err |= copy_siginfo_to_user32(&frame->info, info); |
| 537 | if (err) |
| 538 | goto give_sigsegv; |
| 539 | |
| 540 | /* Create the ucontext. */ |
| 541 | err |= __put_user(0, &frame->uc.uc_flags); |
| 542 | err |= __put_user(0, &frame->uc.uc_link); |
| 543 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); |
| 544 | err |= __put_user(sas_ss_flags(regs->rsp), |
| 545 | &frame->uc.uc_stack.ss_flags); |
| 546 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 547 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
| 548 | regs, set->sig[0]); |
| 549 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 550 | if (err) |
| 551 | goto give_sigsegv; |
| 552 | |
| 553 | |
| 554 | { |
| 555 | void __user *restorer = VSYSCALL32_RTSIGRETURN; |
| 556 | if (ka->sa.sa_flags & SA_RESTORER) |
| 557 | restorer = ka->sa.sa_restorer; |
| 558 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
| 559 | } |
| 560 | |
| 561 | /* This is movl $,%eax ; int $0x80 */ |
| 562 | /* Not actually used anymore, but left because some gdb versions |
| 563 | need it. */ |
| 564 | { |
| 565 | /* __copy_to_user optimizes that into a single 8 byte store */ |
| 566 | static const struct { |
| 567 | u8 movl; |
| 568 | u32 val; |
| 569 | u16 int80; |
| 570 | u16 pad; |
| 571 | u8 pad2; |
| 572 | } __attribute__((packed)) code = { |
| 573 | 0xb8, |
| 574 | __NR_ia32_rt_sigreturn, |
| 575 | 0x80cd, |
| 576 | 0, |
| 577 | }; |
| 578 | err |= __copy_to_user(frame->retcode, &code, 8); |
| 579 | } |
| 580 | if (err) |
| 581 | goto give_sigsegv; |
| 582 | |
| 583 | /* Set up registers for signal handler */ |
| 584 | regs->rsp = (unsigned long) frame; |
| 585 | regs->rip = (unsigned long) ka->sa.sa_handler; |
| 586 | |
Albert Cahalan | a7aacdf | 2006-10-29 22:26:17 -0500 | [diff] [blame] | 587 | /* Make -mregparm=3 work */ |
| 588 | regs->rax = sig; |
| 589 | regs->rdx = (unsigned long) &frame->info; |
| 590 | regs->rcx = (unsigned long) &frame->uc; |
| 591 | |
Albert Cahalan | 8e3de53 | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 592 | /* Make -mregparm=3 work */ |
| 593 | regs->rax = sig; |
| 594 | regs->rdx = (unsigned long) &frame->info; |
| 595 | regs->rcx = (unsigned long) &frame->uc; |
| 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); |
| 598 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); |
| 599 | |
| 600 | regs->cs = __USER32_CS; |
| 601 | regs->ss = __USER32_DS; |
| 602 | |
| 603 | set_fs(USER_DS); |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 604 | regs->eflags &= ~TF_MASK; |
Andi Kleen | ab2e0b4 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 605 | if (test_thread_flag(TIF_SINGLESTEP)) |
| 606 | ptrace_notify(SIGTRAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | #if DEBUG_SIG |
Evgeniy Polyakov | 8469add | 2007-02-13 13:26:25 +0100 | [diff] [blame] | 609 | printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | current->comm, current->pid, frame, regs->rip, frame->pretcode); |
| 611 | #endif |
| 612 | |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 613 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
| 615 | give_sigsegv: |
| 616 | force_sigsegv(sig, current); |
Andi Kleen | 1d001df | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 617 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |