1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/parisc/kernel/signal.c: Architecture-specific signal 4 * handling support. 5 * 6 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> 7 * Copyright (C) 2000 Linuxcare, Inc. 8 * 9 * Based on the ia64, i386, and alpha versions. 10 * 11 * Like the IA-64, we are a recent enough port (we are *starting* 12 * with glibc2.2) that we do not need to support the old non-realtime 13 * Linux signals. Therefore we don't. 14 */ 15 16 #include <linux/sched.h> 17 #include <linux/sched/debug.h> 18 #include <linux/mm.h> 19 #include <linux/smp.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/tracehook.h> 26 #include <linux/unistd.h> 27 #include <linux/stddef.h> 28 #include <linux/compat.h> 29 #include <linux/elf.h> 30 #include <asm/ucontext.h> 31 #include <asm/rt_sigframe.h> 32 #include <linux/uaccess.h> 33 #include <asm/cacheflush.h> 34 #include <asm/asm-offsets.h> 35 36 #ifdef CONFIG_COMPAT 37 #include "signal32.h" 38 #endif 39 40 #define DEBUG_SIG 0 41 #define DEBUG_SIG_LEVEL 2 42 43 #if DEBUG_SIG 44 #define DBG(LEVEL, ...) \ 45 ((DEBUG_SIG_LEVEL >= LEVEL) \ 46 ? printk(__VA_ARGS__) : (void) 0) 47 #else 48 #define DBG(LEVEL, ...) 49 #endif 50 51 /* gcc will complain if a pointer is cast to an integer of different 52 * size. If you really need to do this (and we do for an ELF32 user 53 * application in an ELF64 kernel) then you have to do a cast to an 54 * integer of the same size first. The A() macro accomplishes 55 * this. */ 56 #define A(__x) ((unsigned long)(__x)) 57 58 /* 59 * Do a signal return - restore sigcontext. 60 */ 61 62 /* Trampoline for calling rt_sigreturn() */ 63 #define INSN_LDI_R25_0 0x34190000 /* ldi 0,%r25 (in_syscall=0) */ 64 #define INSN_LDI_R25_1 0x34190002 /* ldi 1,%r25 (in_syscall=1) */ 65 #define INSN_LDI_R20 0x3414015a /* ldi __NR_rt_sigreturn,%r20 */ 66 #define INSN_BLE_SR2_R0 0xe4008200 /* be,l 0x100(%sr2,%r0),%sr0,%r31 */ 67 /* For debugging */ 68 #define INSN_DIE_HORRIBLY 0x68000ccc /* stw %r0,0x666(%sr0,%r0) */ 69 70 static long 71 restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs) 72 { 73 long err = 0; 74 75 err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr)); 76 err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); 77 err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq)); 78 err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq)); 79 err |= __get_user(regs->sar, &sc->sc_sar); 80 DBG(2,"restore_sigcontext: iaoq is %#lx / %#lx\n", 81 regs->iaoq[0],regs->iaoq[1]); 82 DBG(2,"restore_sigcontext: r28 is %ld\n", regs->gr[28]); 83 return err; 84 } 85 86 void 87 sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) 88 { 89 struct rt_sigframe __user *frame; 90 sigset_t set; 91 unsigned long usp = (regs->gr[30] & ~(0x01UL)); 92 unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; 93 #ifdef CONFIG_64BIT 94 struct compat_rt_sigframe __user * compat_frame; 95 96 if (is_compat_task()) 97 sigframe_size = PARISC_RT_SIGFRAME_SIZE32; 98 #endif 99 100 current->restart_block.fn = do_no_restart_syscall; 101 102 /* Unwind the user stack to get the rt_sigframe structure. */ 103 frame = (struct rt_sigframe __user *) 104 (usp - sigframe_size); 105 DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); 106 107 regs->orig_r28 = 1; /* no restarts for sigreturn */ 108 109 #ifdef CONFIG_64BIT 110 compat_frame = (struct compat_rt_sigframe __user *)frame; 111 112 if (is_compat_task()) { 113 DBG(2,"sys_rt_sigreturn: ELF32 process.\n"); 114 if (get_compat_sigset(&set, &compat_frame->uc.uc_sigmask)) 115 goto give_sigsegv; 116 } else 117 #endif 118 { 119 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 120 goto give_sigsegv; 121 } 122 123 set_current_blocked(&set); 124 125 /* Good thing we saved the old gr[30], eh? */ 126 #ifdef CONFIG_64BIT 127 if (is_compat_task()) { 128 DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", 129 &compat_frame->uc.uc_mcontext); 130 // FIXME: Load upper half from register file 131 if (restore_sigcontext32(&compat_frame->uc.uc_mcontext, 132 &compat_frame->regs, regs)) 133 goto give_sigsegv; 134 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", 135 usp, &compat_frame->uc.uc_stack); 136 if (compat_restore_altstack(&compat_frame->uc.uc_stack)) 137 goto give_sigsegv; 138 } else 139 #endif 140 { 141 DBG(1,"sys_rt_sigreturn: frame->uc.uc_mcontext 0x%p\n", 142 &frame->uc.uc_mcontext); 143 if (restore_sigcontext(&frame->uc.uc_mcontext, regs)) 144 goto give_sigsegv; 145 DBG(1,"sys_rt_sigreturn: usp %#08lx stack 0x%p\n", 146 usp, &frame->uc.uc_stack); 147 if (restore_altstack(&frame->uc.uc_stack)) 148 goto give_sigsegv; 149 } 150 151 152 153 /* If we are on the syscall path IAOQ will not be restored, and 154 * if we are on the interrupt path we must not corrupt gr31. 155 */ 156 if (in_syscall) 157 regs->gr[31] = regs->iaoq[0]; 158 #if DEBUG_SIG 159 DBG(1,"sys_rt_sigreturn: returning to %#lx, DUMPING REGS:\n", regs->iaoq[0]); 160 show_regs(regs); 161 #endif 162 return; 163 164 give_sigsegv: 165 DBG(1,"sys_rt_sigreturn: Sending SIGSEGV\n"); 166 force_sig(SIGSEGV); 167 return; 168 } 169 170 /* 171 * Set up a signal frame. 172 */ 173 174 static inline void __user * 175 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) 176 { 177 /*FIXME: ELF32 vs. ELF64 has different frame_size, but since we 178 don't use the parameter it doesn't matter */ 179 180 DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n", 181 (unsigned long)ka, sp, frame_size); 182 183 /* Align alternate stack and reserve 64 bytes for the signal 184 handler's frame marker. */ 185 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) 186 sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */ 187 188 DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp); 189 return (void __user *) sp; /* Stacks grow up. Fun. */ 190 } 191 192 static long 193 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall) 194 195 { 196 unsigned long flags = 0; 197 long err = 0; 198 199 if (on_sig_stack((unsigned long) sc)) 200 flags |= PARISC_SC_FLAG_ONSTACK; 201 if (in_syscall) { 202 flags |= PARISC_SC_FLAG_IN_SYSCALL; 203 /* regs->iaoq is undefined in the syscall return path */ 204 err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]); 205 err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]); 206 err |= __put_user(regs->sr[3], &sc->sc_iasq[0]); 207 err |= __put_user(regs->sr[3], &sc->sc_iasq[1]); 208 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (in syscall)\n", 209 regs->gr[31], regs->gr[31]+4); 210 } else { 211 err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq)); 212 err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq)); 213 DBG(1,"setup_sigcontext: iaoq %#lx / %#lx (not in syscall)\n", 214 regs->iaoq[0], regs->iaoq[1]); 215 } 216 217 err |= __put_user(flags, &sc->sc_flags); 218 err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr)); 219 err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); 220 err |= __put_user(regs->sar, &sc->sc_sar); 221 DBG(1,"setup_sigcontext: r28 is %ld\n", regs->gr[28]); 222 223 return err; 224 } 225 226 static long 227 setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs, 228 int in_syscall) 229 { 230 struct rt_sigframe __user *frame; 231 unsigned long rp, usp; 232 unsigned long haddr, sigframe_size; 233 unsigned long start, end; 234 int err = 0; 235 #ifdef CONFIG_64BIT 236 struct compat_rt_sigframe __user * compat_frame; 237 #endif 238 239 usp = (regs->gr[30] & ~(0x01UL)); 240 sigframe_size = PARISC_RT_SIGFRAME_SIZE; 241 #ifdef CONFIG_64BIT 242 if (is_compat_task()) { 243 /* The gcc alloca implementation leaves garbage in the upper 32 bits of sp */ 244 usp = (compat_uint_t)usp; 245 sigframe_size = PARISC_RT_SIGFRAME_SIZE32; 246 } 247 #endif 248 frame = get_sigframe(&ksig->ka, usp, sigframe_size); 249 250 DBG(1,"SETUP_RT_FRAME: START\n"); 251 DBG(1,"setup_rt_frame: frame %p info %p\n", frame, ksig->info); 252 253 start = (unsigned long) frame; 254 if (start >= user_addr_max() - sigframe_size) 255 return -EFAULT; 256 257 #ifdef CONFIG_64BIT 258 259 compat_frame = (struct compat_rt_sigframe __user *)frame; 260 261 if (is_compat_task()) { 262 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info); 263 err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info); 264 err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]); 265 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &compat_frame->uc); 266 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &compat_frame->uc.uc_mcontext); 267 err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext, 268 &compat_frame->regs, regs, in_syscall); 269 err |= put_compat_sigset(&compat_frame->uc.uc_sigmask, set, 270 sizeof(compat_sigset_t)); 271 } else 272 #endif 273 { 274 DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &frame->info); 275 err |= copy_siginfo_to_user(&frame->info, &ksig->info); 276 err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]); 277 DBG(1,"setup_rt_frame: frame->uc = 0x%p\n", &frame->uc); 278 DBG(1,"setup_rt_frame: frame->uc.uc_mcontext = 0x%p\n", &frame->uc.uc_mcontext); 279 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall); 280 /* FIXME: Should probably be converted as well for the compat case */ 281 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); 282 } 283 284 if (err) 285 return -EFAULT; 286 287 /* Set up to return from userspace. If provided, use a stub 288 already in userspace. The first words of tramp are used to 289 save the previous sigrestartblock trampoline that might be 290 on the stack. We start the sigreturn trampoline at 291 SIGRESTARTBLOCK_TRAMP+X. */ 292 err |= __put_user(in_syscall ? INSN_LDI_R25_1 : INSN_LDI_R25_0, 293 &frame->tramp[SIGRESTARTBLOCK_TRAMP+0]); 294 err |= __put_user(INSN_LDI_R20, 295 &frame->tramp[SIGRESTARTBLOCK_TRAMP+1]); 296 err |= __put_user(INSN_BLE_SR2_R0, 297 &frame->tramp[SIGRESTARTBLOCK_TRAMP+2]); 298 err |= __put_user(INSN_NOP, &frame->tramp[SIGRESTARTBLOCK_TRAMP+3]); 299 300 start = (unsigned long) &frame->tramp[0]; 301 end = (unsigned long) &frame->tramp[TRAMP_SIZE]; 302 flush_user_dcache_range_asm(start, end); 303 flush_user_icache_range_asm(start, end); 304 305 /* TRAMP Words 0-4, Length 5 = SIGRESTARTBLOCK_TRAMP 306 * TRAMP Words 5-9, Length 4 = SIGRETURN_TRAMP 307 * So the SIGRETURN_TRAMP is at the end of SIGRESTARTBLOCK_TRAMP 308 */ 309 rp = (unsigned long) &frame->tramp[SIGRESTARTBLOCK_TRAMP]; 310 311 if (err) 312 return -EFAULT; 313 314 haddr = A(ksig->ka.sa.sa_handler); 315 /* The sa_handler may be a pointer to a function descriptor */ 316 #ifdef CONFIG_64BIT 317 if (is_compat_task()) { 318 #endif 319 if (haddr & PA_PLABEL_FDESC) { 320 Elf32_Fdesc fdesc; 321 Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3); 322 323 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); 324 325 if (err) 326 return -EFAULT; 327 328 haddr = fdesc.addr; 329 regs->gr[19] = fdesc.gp; 330 } 331 #ifdef CONFIG_64BIT 332 } else { 333 Elf64_Fdesc fdesc; 334 Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); 335 336 err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc)); 337 338 if (err) 339 return -EFAULT; 340 341 haddr = fdesc.addr; 342 regs->gr[19] = fdesc.gp; 343 DBG(1,"setup_rt_frame: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n", 344 haddr, regs->gr[19], in_syscall); 345 } 346 #endif 347 348 /* The syscall return path will create IAOQ values from r31. 349 */ 350 if (in_syscall) { 351 regs->gr[31] = haddr; 352 #ifdef CONFIG_64BIT 353 if (!test_thread_flag(TIF_32BIT)) 354 sigframe_size |= 1; 355 #endif 356 } else { 357 unsigned long psw = USER_PSW; 358 #ifdef CONFIG_64BIT 359 if (!test_thread_flag(TIF_32BIT)) 360 psw |= PSW_W; 361 #endif 362 363 /* If we are singlestepping, arrange a trap to be delivered 364 when we return to userspace. Note the semantics -- we 365 should trap before the first insn in the handler is 366 executed. Ref: 367 http://sources.redhat.com/ml/gdb/2004-11/msg00245.html 368 */ 369 if (pa_psw(current)->r) { 370 pa_psw(current)->r = 0; 371 psw |= PSW_R; 372 mtctl(-1, 0); 373 } 374 375 regs->gr[0] = psw; 376 regs->iaoq[0] = haddr | 3; 377 regs->iaoq[1] = regs->iaoq[0] + 4; 378 } 379 380 regs->gr[2] = rp; /* userland return pointer */ 381 regs->gr[26] = ksig->sig; /* signal number */ 382 383 #ifdef CONFIG_64BIT 384 if (is_compat_task()) { 385 regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ 386 regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ 387 } else 388 #endif 389 { 390 regs->gr[25] = A(&frame->info); /* siginfo pointer */ 391 regs->gr[24] = A(&frame->uc); /* ucontext pointer */ 392 } 393 394 DBG(1,"setup_rt_frame: making sigreturn frame: %#lx + %#lx = %#lx\n", 395 regs->gr[30], sigframe_size, 396 regs->gr[30] + sigframe_size); 397 /* Raise the user stack pointer to make a proper call frame. */ 398 regs->gr[30] = (A(frame) + sigframe_size); 399 400 401 DBG(1,"setup_rt_frame: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n", 402 current->comm, current->pid, frame, regs->gr[30], 403 regs->iaoq[0], regs->iaoq[1], rp); 404 405 return 0; 406 } 407 408 /* 409 * OK, we're invoking a handler. 410 */ 411 412 static void 413 handle_signal(struct ksignal *ksig, struct pt_regs *regs, int in_syscall) 414 { 415 int ret; 416 sigset_t *oldset = sigmask_to_save(); 417 418 DBG(1,"handle_signal: sig=%ld, ka=%p, info=%p, oldset=%p, regs=%p\n", 419 ksig->sig, ksig->ka, ksig->info, oldset, regs); 420 421 /* Set up the stack frame */ 422 ret = setup_rt_frame(ksig, oldset, regs, in_syscall); 423 424 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) || 425 test_thread_flag(TIF_BLOCKSTEP)); 426 427 DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", 428 regs->gr[28]); 429 } 430 431 /* 432 * Check how the syscall number gets loaded into %r20 within 433 * the delay branch in userspace and adjust as needed. 434 */ 435 436 static void check_syscallno_in_delay_branch(struct pt_regs *regs) 437 { 438 u32 opcode, source_reg; 439 u32 __user *uaddr; 440 int err; 441 442 /* Usually we don't have to restore %r20 (the system call number) 443 * because it gets loaded in the delay slot of the branch external 444 * instruction via the ldi instruction. 445 * In some cases a register-to-register copy instruction might have 446 * been used instead, in which case we need to copy the syscall 447 * number into the source register before returning to userspace. 448 */ 449 450 /* A syscall is just a branch, so all we have to do is fiddle the 451 * return pointer so that the ble instruction gets executed again. 452 */ 453 regs->gr[31] -= 8; /* delayed branching */ 454 455 /* Get assembler opcode of code in delay branch */ 456 uaddr = (unsigned int *) ((regs->gr[31] & ~3) + 4); 457 err = get_user(opcode, uaddr); 458 if (err) 459 return; 460 461 /* Check if delay branch uses "ldi int,%r20" */ 462 if ((opcode & 0xffff0000) == 0x34140000) 463 return; /* everything ok, just return */ 464 465 /* Check if delay branch uses "nop" */ 466 if (opcode == INSN_NOP) 467 return; 468 469 /* Check if delay branch uses "copy %rX,%r20" */ 470 if ((opcode & 0xffe0ffff) == 0x08000254) { 471 source_reg = (opcode >> 16) & 31; 472 regs->gr[source_reg] = regs->gr[20]; 473 return; 474 } 475 476 pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n", 477 current->comm, task_pid_nr(current), opcode); 478 } 479 480 static inline void 481 syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) 482 { 483 if (regs->orig_r28) 484 return; 485 regs->orig_r28 = 1; /* no more restarts */ 486 /* Check the return code */ 487 switch (regs->gr[28]) { 488 case -ERESTART_RESTARTBLOCK: 489 case -ERESTARTNOHAND: 490 DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); 491 regs->gr[28] = -EINTR; 492 break; 493 case -ERESTARTSYS: 494 if (!(ka->sa.sa_flags & SA_RESTART)) { 495 DBG(1,"ERESTARTSYS: putting -EINTR\n"); 496 regs->gr[28] = -EINTR; 497 break; 498 } 499 fallthrough; 500 case -ERESTARTNOINTR: 501 check_syscallno_in_delay_branch(regs); 502 break; 503 } 504 } 505 506 static inline void 507 insert_restart_trampoline(struct pt_regs *regs) 508 { 509 if (regs->orig_r28) 510 return; 511 regs->orig_r28 = 1; /* no more restarts */ 512 switch(regs->gr[28]) { 513 case -ERESTART_RESTARTBLOCK: { 514 /* Restart the system call - no handlers present */ 515 unsigned int *usp = (unsigned int *)regs->gr[30]; 516 unsigned long start = (unsigned long) &usp[2]; 517 unsigned long end = (unsigned long) &usp[5]; 518 long err = 0; 519 520 /* check that we don't exceed the stack */ 521 if (A(&usp[0]) >= user_addr_max() - 5 * sizeof(int)) 522 return; 523 524 /* Setup a trampoline to restart the syscall 525 * with __NR_restart_syscall 526 * 527 * 0: <return address (orig r31)> 528 * 4: <2nd half for 64-bit> 529 * 8: ldw 0(%sp), %r31 530 * 12: be 0x100(%sr2, %r0) 531 * 16: ldi __NR_restart_syscall, %r20 532 */ 533 #ifdef CONFIG_64BIT 534 err |= put_user(regs->gr[31] >> 32, &usp[0]); 535 err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]); 536 err |= put_user(0x0fc010df, &usp[2]); 537 #else 538 err |= put_user(regs->gr[31], &usp[0]); 539 err |= put_user(0x0fc0109f, &usp[2]); 540 #endif 541 err |= put_user(0xe0008200, &usp[3]); 542 err |= put_user(0x34140000, &usp[4]); 543 544 WARN_ON(err); 545 546 /* flush data/instruction cache for new insns */ 547 flush_user_dcache_range_asm(start, end); 548 flush_user_icache_range_asm(start, end); 549 550 regs->gr[31] = regs->gr[30] + 8; 551 return; 552 } 553 case -ERESTARTNOHAND: 554 case -ERESTARTSYS: 555 case -ERESTARTNOINTR: 556 check_syscallno_in_delay_branch(regs); 557 return; 558 default: 559 break; 560 } 561 } 562 563 /* 564 * We need to be able to restore the syscall arguments (r21-r26) to 565 * restart syscalls. Thus, the syscall path should save them in the 566 * pt_regs structure (it's okay to do so since they are caller-save 567 * registers). As noted below, the syscall number gets restored for 568 * us due to the magic of delayed branching. 569 */ 570 asmlinkage void 571 do_signal(struct pt_regs *regs, long in_syscall) 572 { 573 struct ksignal ksig; 574 575 DBG(1,"\ndo_signal: regs=0x%p, sr7 %#lx, in_syscall=%d\n", 576 regs, regs->sr[7], in_syscall); 577 578 if (get_signal(&ksig)) { 579 DBG(3,"do_signal: signr = %d, regs->gr[28] = %ld\n", signr, regs->gr[28]); 580 /* Restart a system call if necessary. */ 581 if (in_syscall) 582 syscall_restart(regs, &ksig.ka); 583 584 handle_signal(&ksig, regs, in_syscall); 585 return; 586 } 587 588 /* Did we come from a system call? */ 589 if (in_syscall) 590 insert_restart_trampoline(regs); 591 592 DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", 593 regs->gr[28]); 594 595 restore_saved_sigmask(); 596 } 597 598 void do_notify_resume(struct pt_regs *regs, long in_syscall) 599 { 600 if (test_thread_flag(TIF_SIGPENDING) || 601 test_thread_flag(TIF_NOTIFY_SIGNAL)) 602 do_signal(regs, in_syscall); 603 604 if (test_thread_flag(TIF_NOTIFY_RESUME)) 605 tracehook_notify_resume(regs); 606 } 607