signal.c revision 7d4fdc19fc134f69f3711c14e63caef56aee0f2a
1/* 2 * linux/arch/arm/kernel/signal.c 3 * 4 * Copyright (C) 1995-2002 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10#include <linux/config.h> 11#include <linux/errno.h> 12#include <linux/signal.h> 13#include <linux/ptrace.h> 14#include <linux/personality.h> 15 16#include <asm/cacheflush.h> 17#include <asm/ucontext.h> 18#include <asm/uaccess.h> 19#include <asm/unistd.h> 20 21#include "ptrace.h" 22#include "signal.h" 23 24#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 25 26/* 27 * For ARM syscalls, we encode the syscall number into the instruction. 28 */ 29#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)) 30#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)) 31 32/* 33 * With EABI, the syscall number has to be loaded into r7. 34 */ 35#define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE)) 36#define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) 37 38/* 39 * For Thumb syscalls, we pass the syscall number via r7. We therefore 40 * need two 16-bit instructions. 41 */ 42#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE)) 43#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) 44 45const unsigned long sigreturn_codes[7] = { 46 MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, 47 MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN, 48}; 49 50static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall); 51 52/* 53 * atomically swap in the new signal mask, and wait for a signal. 54 */ 55asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs) 56{ 57 sigset_t saveset; 58 59 mask &= _BLOCKABLE; 60 spin_lock_irq(¤t->sighand->siglock); 61 saveset = current->blocked; 62 siginitset(¤t->blocked, mask); 63 recalc_sigpending(); 64 spin_unlock_irq(¤t->sighand->siglock); 65 regs->ARM_r0 = -EINTR; 66 67 while (1) { 68 current->state = TASK_INTERRUPTIBLE; 69 schedule(); 70 if (do_signal(&saveset, regs, 0)) 71 return regs->ARM_r0; 72 } 73} 74 75asmlinkage int 76sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs) 77{ 78 sigset_t saveset, newset; 79 80 /* XXX: Don't preclude handling different sized sigset_t's. */ 81 if (sigsetsize != sizeof(sigset_t)) 82 return -EINVAL; 83 84 if (copy_from_user(&newset, unewset, sizeof(newset))) 85 return -EFAULT; 86 sigdelsetmask(&newset, ~_BLOCKABLE); 87 88 spin_lock_irq(¤t->sighand->siglock); 89 saveset = current->blocked; 90 current->blocked = newset; 91 recalc_sigpending(); 92 spin_unlock_irq(¤t->sighand->siglock); 93 regs->ARM_r0 = -EINTR; 94 95 while (1) { 96 current->state = TASK_INTERRUPTIBLE; 97 schedule(); 98 if (do_signal(&saveset, regs, 0)) 99 return regs->ARM_r0; 100 } 101} 102 103asmlinkage int 104sys_sigaction(int sig, const struct old_sigaction __user *act, 105 struct old_sigaction __user *oact) 106{ 107 struct k_sigaction new_ka, old_ka; 108 int ret; 109 110 if (act) { 111 old_sigset_t mask; 112 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 113 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 114 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) 115 return -EFAULT; 116 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 117 __get_user(mask, &act->sa_mask); 118 siginitset(&new_ka.sa.sa_mask, mask); 119 } 120 121 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 122 123 if (!ret && oact) { 124 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 125 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 126 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) 127 return -EFAULT; 128 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 129 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 130 } 131 132 return ret; 133} 134 135#ifdef CONFIG_IWMMXT 136 137/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */ 138#define IWMMXT_STORAGE_SIZE (0x98 + 8) 139#define IWMMXT_MAGIC0 0x12ef842a 140#define IWMMXT_MAGIC1 0x1c07ca71 141 142struct iwmmxt_sigframe { 143 unsigned long magic0; 144 unsigned long magic1; 145 unsigned long storage[0x98/4]; 146}; 147 148static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame) 149{ 150 char kbuf[sizeof(*frame) + 8]; 151 struct iwmmxt_sigframe *kframe; 152 153 /* the iWMMXt context must be 64 bit aligned */ 154 kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); 155 kframe->magic0 = IWMMXT_MAGIC0; 156 kframe->magic1 = IWMMXT_MAGIC1; 157 iwmmxt_task_copy(current_thread_info(), &kframe->storage); 158 return __copy_to_user(frame, kframe, sizeof(*frame)); 159} 160 161static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame) 162{ 163 char kbuf[sizeof(*frame) + 8]; 164 struct iwmmxt_sigframe *kframe; 165 166 /* the iWMMXt context must be 64 bit aligned */ 167 kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); 168 if (__copy_from_user(kframe, frame, sizeof(*frame))) 169 return -1; 170 if (kframe->magic0 != IWMMXT_MAGIC0 || 171 kframe->magic1 != IWMMXT_MAGIC1) 172 return -1; 173 iwmmxt_task_restore(current_thread_info(), &kframe->storage); 174 return 0; 175} 176 177#endif 178 179/* 180 * Auxiliary signal frame. This saves stuff like FP state. 181 * The layout of this structure is not part of the user ABI. 182 */ 183struct aux_sigframe { 184#ifdef CONFIG_IWMMXT 185 struct iwmmxt_sigframe iwmmxt; 186#endif 187#ifdef CONFIG_VFP 188 union vfp_state vfp; 189#endif 190}; 191 192/* 193 * Do a signal return; undo the signal stack. These are aligned to 64-bit. 194 */ 195struct sigframe { 196 struct ucontext uc; 197 unsigned long retcode[2]; 198 struct aux_sigframe aux __attribute__((aligned(8))); 199}; 200 201struct rt_sigframe { 202 struct siginfo info; 203 struct ucontext uc; 204 unsigned long retcode[2]; 205 struct aux_sigframe aux __attribute__((aligned(8))); 206}; 207 208static int 209restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, 210 struct aux_sigframe __user *aux) 211{ 212 int err = 0; 213 214 __get_user_error(regs->ARM_r0, &sc->arm_r0, err); 215 __get_user_error(regs->ARM_r1, &sc->arm_r1, err); 216 __get_user_error(regs->ARM_r2, &sc->arm_r2, err); 217 __get_user_error(regs->ARM_r3, &sc->arm_r3, err); 218 __get_user_error(regs->ARM_r4, &sc->arm_r4, err); 219 __get_user_error(regs->ARM_r5, &sc->arm_r5, err); 220 __get_user_error(regs->ARM_r6, &sc->arm_r6, err); 221 __get_user_error(regs->ARM_r7, &sc->arm_r7, err); 222 __get_user_error(regs->ARM_r8, &sc->arm_r8, err); 223 __get_user_error(regs->ARM_r9, &sc->arm_r9, err); 224 __get_user_error(regs->ARM_r10, &sc->arm_r10, err); 225 __get_user_error(regs->ARM_fp, &sc->arm_fp, err); 226 __get_user_error(regs->ARM_ip, &sc->arm_ip, err); 227 __get_user_error(regs->ARM_sp, &sc->arm_sp, err); 228 __get_user_error(regs->ARM_lr, &sc->arm_lr, err); 229 __get_user_error(regs->ARM_pc, &sc->arm_pc, err); 230 __get_user_error(regs->ARM_cpsr, &sc->arm_cpsr, err); 231 232 err |= !valid_user_regs(regs); 233 234#ifdef CONFIG_IWMMXT 235 if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) 236 err |= restore_iwmmxt_context(&aux->iwmmxt); 237#endif 238#ifdef CONFIG_VFP 239// if (err == 0) 240// err |= vfp_restore_state(&aux->vfp); 241#endif 242 243 return err; 244} 245 246asmlinkage int sys_sigreturn(struct pt_regs *regs) 247{ 248 struct sigframe __user *frame; 249 sigset_t set; 250 251 /* Always make any pending restarted system calls return -EINTR */ 252 current_thread_info()->restart_block.fn = do_no_restart_syscall; 253 254 /* 255 * Since we stacked the signal on a 64-bit boundary, 256 * then 'sp' should be word aligned here. If it's 257 * not, then the user is trying to mess with us. 258 */ 259 if (regs->ARM_sp & 7) 260 goto badframe; 261 262 frame = (struct sigframe __user *)regs->ARM_sp; 263 264 if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) 265 goto badframe; 266 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 267 goto badframe; 268 269 sigdelsetmask(&set, ~_BLOCKABLE); 270 spin_lock_irq(¤t->sighand->siglock); 271 current->blocked = set; 272 recalc_sigpending(); 273 spin_unlock_irq(¤t->sighand->siglock); 274 275 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &frame->aux)) 276 goto badframe; 277 278 /* Send SIGTRAP if we're single-stepping */ 279 if (current->ptrace & PT_SINGLESTEP) { 280 ptrace_cancel_bpt(current); 281 send_sig(SIGTRAP, current, 1); 282 } 283 284 return regs->ARM_r0; 285 286badframe: 287 force_sig(SIGSEGV, current); 288 return 0; 289} 290 291asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) 292{ 293 struct rt_sigframe __user *frame; 294 sigset_t set; 295 296 /* Always make any pending restarted system calls return -EINTR */ 297 current_thread_info()->restart_block.fn = do_no_restart_syscall; 298 299 /* 300 * Since we stacked the signal on a 64-bit boundary, 301 * then 'sp' should be word aligned here. If it's 302 * not, then the user is trying to mess with us. 303 */ 304 if (regs->ARM_sp & 7) 305 goto badframe; 306 307 frame = (struct rt_sigframe __user *)regs->ARM_sp; 308 309 if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) 310 goto badframe; 311 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 312 goto badframe; 313 314 sigdelsetmask(&set, ~_BLOCKABLE); 315 spin_lock_irq(¤t->sighand->siglock); 316 current->blocked = set; 317 recalc_sigpending(); 318 spin_unlock_irq(¤t->sighand->siglock); 319 320 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &frame->aux)) 321 goto badframe; 322 323 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT) 324 goto badframe; 325 326 /* Send SIGTRAP if we're single-stepping */ 327 if (current->ptrace & PT_SINGLESTEP) { 328 ptrace_cancel_bpt(current); 329 send_sig(SIGTRAP, current, 1); 330 } 331 332 return regs->ARM_r0; 333 334badframe: 335 force_sig(SIGSEGV, current); 336 return 0; 337} 338 339static int 340setup_sigcontext(struct sigcontext __user *sc, struct aux_sigframe __user *aux, 341 struct pt_regs *regs, unsigned long mask) 342{ 343 int err = 0; 344 345 __put_user_error(regs->ARM_r0, &sc->arm_r0, err); 346 __put_user_error(regs->ARM_r1, &sc->arm_r1, err); 347 __put_user_error(regs->ARM_r2, &sc->arm_r2, err); 348 __put_user_error(regs->ARM_r3, &sc->arm_r3, err); 349 __put_user_error(regs->ARM_r4, &sc->arm_r4, err); 350 __put_user_error(regs->ARM_r5, &sc->arm_r5, err); 351 __put_user_error(regs->ARM_r6, &sc->arm_r6, err); 352 __put_user_error(regs->ARM_r7, &sc->arm_r7, err); 353 __put_user_error(regs->ARM_r8, &sc->arm_r8, err); 354 __put_user_error(regs->ARM_r9, &sc->arm_r9, err); 355 __put_user_error(regs->ARM_r10, &sc->arm_r10, err); 356 __put_user_error(regs->ARM_fp, &sc->arm_fp, err); 357 __put_user_error(regs->ARM_ip, &sc->arm_ip, err); 358 __put_user_error(regs->ARM_sp, &sc->arm_sp, err); 359 __put_user_error(regs->ARM_lr, &sc->arm_lr, err); 360 __put_user_error(regs->ARM_pc, &sc->arm_pc, err); 361 __put_user_error(regs->ARM_cpsr, &sc->arm_cpsr, err); 362 363 __put_user_error(current->thread.trap_no, &sc->trap_no, err); 364 __put_user_error(current->thread.error_code, &sc->error_code, err); 365 __put_user_error(current->thread.address, &sc->fault_address, err); 366 __put_user_error(mask, &sc->oldmask, err); 367 368#ifdef CONFIG_IWMMXT 369 if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) 370 err |= preserve_iwmmxt_context(&aux->iwmmxt); 371#endif 372#ifdef CONFIG_VFP 373// if (err == 0) 374// err |= vfp_save_state(&aux->vfp); 375#endif 376 377 return err; 378} 379 380static inline void __user * 381get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize) 382{ 383 unsigned long sp = regs->ARM_sp; 384 void __user *frame; 385 386 /* 387 * This is the X/Open sanctioned signal stack switching. 388 */ 389 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) 390 sp = current->sas_ss_sp + current->sas_ss_size; 391 392 /* 393 * ATPCS B01 mandates 8-byte alignment 394 */ 395 frame = (void __user *)((sp - framesize) & ~7); 396 397 /* 398 * Check that we can actually write to the signal frame. 399 */ 400 if (!access_ok(VERIFY_WRITE, frame, framesize)) 401 frame = NULL; 402 403 return frame; 404} 405 406static int 407setup_return(struct pt_regs *regs, struct k_sigaction *ka, 408 unsigned long __user *rc, void __user *frame, int usig) 409{ 410 unsigned long handler = (unsigned long)ka->sa.sa_handler; 411 unsigned long retcode; 412 int thumb = 0; 413 unsigned long cpsr = regs->ARM_cpsr & ~PSR_f; 414 415 /* 416 * Maybe we need to deliver a 32-bit signal to a 26-bit task. 417 */ 418 if (ka->sa.sa_flags & SA_THIRTYTWO) 419 cpsr = (cpsr & ~MODE_MASK) | USR_MODE; 420 421#ifdef CONFIG_ARM_THUMB 422 if (elf_hwcap & HWCAP_THUMB) { 423 /* 424 * The LSB of the handler determines if we're going to 425 * be using THUMB or ARM mode for this signal handler. 426 */ 427 thumb = handler & 1; 428 429 if (thumb) 430 cpsr |= PSR_T_BIT; 431 else 432 cpsr &= ~PSR_T_BIT; 433 } 434#endif 435 436 if (ka->sa.sa_flags & SA_RESTORER) { 437 retcode = (unsigned long)ka->sa.sa_restorer; 438 } else { 439 unsigned int idx = thumb << 1; 440 441 if (ka->sa.sa_flags & SA_SIGINFO) 442 idx += 3; 443 444 if (__put_user(sigreturn_codes[idx], rc) || 445 __put_user(sigreturn_codes[idx+1], rc+1)) 446 return 1; 447 448 if (cpsr & MODE32_BIT) { 449 /* 450 * 32-bit code can use the new high-page 451 * signal return code support. 452 */ 453 retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; 454 } else { 455 /* 456 * Ensure that the instruction cache sees 457 * the return code written onto the stack. 458 */ 459 flush_icache_range((unsigned long)rc, 460 (unsigned long)(rc + 2)); 461 462 retcode = ((unsigned long)rc) + thumb; 463 } 464 } 465 466 regs->ARM_r0 = usig; 467 regs->ARM_sp = (unsigned long)frame; 468 regs->ARM_lr = retcode; 469 regs->ARM_pc = handler; 470 regs->ARM_cpsr = cpsr; 471 472 return 0; 473} 474 475static int 476setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) 477{ 478 struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); 479 int err = 0; 480 481 if (!frame) 482 return 1; 483 484 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->aux, regs, set->sig[0]); 485 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); 486 487 if (err == 0) 488 err = setup_return(regs, ka, frame->retcode, frame, usig); 489 490 return err; 491} 492 493static int 494setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, 495 sigset_t *set, struct pt_regs *regs) 496{ 497 struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); 498 stack_t stack; 499 int err = 0; 500 501 if (!frame) 502 return 1; 503 504 err |= copy_siginfo_to_user(&frame->info, info); 505 506 __put_user_error(0, &frame->uc.uc_flags, err); 507 __put_user_error(NULL, &frame->uc.uc_link, err); 508 509 memset(&stack, 0, sizeof(stack)); 510 stack.ss_sp = (void __user *)current->sas_ss_sp; 511 stack.ss_flags = sas_ss_flags(regs->ARM_sp); 512 stack.ss_size = current->sas_ss_size; 513 err |= __copy_to_user(&frame->uc.uc_stack, &stack, sizeof(stack)); 514 515 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->aux, 516 regs, set->sig[0]); 517 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); 518 519 if (err == 0) 520 err = setup_return(regs, ka, frame->retcode, frame, usig); 521 522 if (err == 0) { 523 /* 524 * For realtime signals we must also set the second and third 525 * arguments for the signal handler. 526 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06 527 */ 528 regs->ARM_r1 = (unsigned long)&frame->info; 529 regs->ARM_r2 = (unsigned long)&frame->uc; 530 } 531 532 return err; 533} 534 535static inline void restart_syscall(struct pt_regs *regs) 536{ 537 regs->ARM_r0 = regs->ARM_ORIG_r0; 538 regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; 539} 540 541/* 542 * OK, we're invoking a handler 543 */ 544static void 545handle_signal(unsigned long sig, struct k_sigaction *ka, 546 siginfo_t *info, sigset_t *oldset, 547 struct pt_regs * regs, int syscall) 548{ 549 struct thread_info *thread = current_thread_info(); 550 struct task_struct *tsk = current; 551 int usig = sig; 552 int ret; 553 554 /* 555 * If we were from a system call, check for system call restarting... 556 */ 557 if (syscall) { 558 switch (regs->ARM_r0) { 559 case -ERESTART_RESTARTBLOCK: 560 case -ERESTARTNOHAND: 561 regs->ARM_r0 = -EINTR; 562 break; 563 case -ERESTARTSYS: 564 if (!(ka->sa.sa_flags & SA_RESTART)) { 565 regs->ARM_r0 = -EINTR; 566 break; 567 } 568 /* fallthrough */ 569 case -ERESTARTNOINTR: 570 restart_syscall(regs); 571 } 572 } 573 574 /* 575 * translate the signal 576 */ 577 if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap) 578 usig = thread->exec_domain->signal_invmap[usig]; 579 580 /* 581 * Set up the stack frame 582 */ 583 if (ka->sa.sa_flags & SA_SIGINFO) 584 ret = setup_rt_frame(usig, ka, info, oldset, regs); 585 else 586 ret = setup_frame(usig, ka, oldset, regs); 587 588 /* 589 * Check that the resulting registers are actually sane. 590 */ 591 ret |= !valid_user_regs(regs); 592 593 if (ret != 0) { 594 force_sigsegv(sig, tsk); 595 return; 596 } 597 598 /* 599 * Block the signal if we were successful. 600 */ 601 spin_lock_irq(&tsk->sighand->siglock); 602 sigorsets(&tsk->blocked, &tsk->blocked, 603 &ka->sa.sa_mask); 604 if (!(ka->sa.sa_flags & SA_NODEFER)) 605 sigaddset(&tsk->blocked, sig); 606 recalc_sigpending(); 607 spin_unlock_irq(&tsk->sighand->siglock); 608 609} 610 611/* 612 * Note that 'init' is a special process: it doesn't get signals it doesn't 613 * want to handle. Thus you cannot kill init even with a SIGKILL even by 614 * mistake. 615 * 616 * Note that we go through the signals twice: once to check the signals that 617 * the kernel can handle, and then we build all the user-level signal handling 618 * stack-frames in one go after that. 619 */ 620static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall) 621{ 622 struct k_sigaction ka; 623 siginfo_t info; 624 int signr; 625 626 /* 627 * We want the common case to go fast, which 628 * is why we may in certain cases get here from 629 * kernel mode. Just return without doing anything 630 * if so. 631 */ 632 if (!user_mode(regs)) 633 return 0; 634 635 if (try_to_freeze()) 636 goto no_signal; 637 638 if (current->ptrace & PT_SINGLESTEP) 639 ptrace_cancel_bpt(current); 640 641 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 642 if (signr > 0) { 643 handle_signal(signr, &ka, &info, oldset, regs, syscall); 644 if (current->ptrace & PT_SINGLESTEP) 645 ptrace_set_bpt(current); 646 return 1; 647 } 648 649 no_signal: 650 /* 651 * No signal to deliver to the process - restart the syscall. 652 */ 653 if (syscall) { 654 if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) { 655 if (thumb_mode(regs)) { 656 regs->ARM_r7 = __NR_restart_syscall; 657 regs->ARM_pc -= 2; 658 } else { 659 u32 __user *usp; 660 661 regs->ARM_sp -= 12; 662 usp = (u32 __user *)regs->ARM_sp; 663 664 put_user(regs->ARM_pc, &usp[0]); 665 /* swi __NR_restart_syscall */ 666 put_user(0xef000000 | __NR_restart_syscall, &usp[1]); 667 /* ldr pc, [sp], #12 */ 668 put_user(0xe49df00c, &usp[2]); 669 670 flush_icache_range((unsigned long)usp, 671 (unsigned long)(usp + 3)); 672 673 regs->ARM_pc = regs->ARM_sp + 4; 674 } 675 } 676 if (regs->ARM_r0 == -ERESTARTNOHAND || 677 regs->ARM_r0 == -ERESTARTSYS || 678 regs->ARM_r0 == -ERESTARTNOINTR) { 679 restart_syscall(regs); 680 } 681 } 682 if (current->ptrace & PT_SINGLESTEP) 683 ptrace_set_bpt(current); 684 return 0; 685} 686 687asmlinkage void 688do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall) 689{ 690 if (thread_flags & _TIF_SIGPENDING) 691 do_signal(¤t->blocked, regs, syscall); 692} 693