1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@ !! 2 * linux/arch/m68k/kernel/signal.c
>> 3 *
>> 4 * Copyright (C) 1991, 1992 Linus Torvalds
>> 5 *
>> 6 * This file is subject to the terms and conditions of the GNU General Public
>> 7 * License. See the file COPYING in the main directory of this archive
>> 8 * for more details.
>> 9 */
>> 10
>> 11 /*
>> 12 * Linux/m68k support by Hamish Macdonald
>> 13 *
>> 14 * 68060 fixes by Jesper Skov
>> 15 *
>> 16 * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
>> 17 *
>> 18 * mathemu support by Roman Zippel
>> 19 * (Note: fpstate in the signal context is completely ignored for the emulator
>> 20 * and the internal floating point format is put on stack)
>> 21 */
>> 22
>> 23 /*
>> 24 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
>> 25 * Atari :-) Current limitation: Only one sigstack can be active at one time.
>> 26 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
>> 27 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
>> 28 * signal handlers!
4 */ 29 */
5 30
6 #include <linux/module.h> <<
7 #include <linux/ptrace.h> <<
8 #include <linux/sched.h> 31 #include <linux/sched.h>
9 #include <linux/ftrace.h> !! 32 #include <linux/mm.h>
10 #include <asm/siginfo.h> !! 33 #include <linux/kernel.h>
11 #include <asm/signal.h> !! 34 #include <linux/signal.h>
12 #include <asm/unistd.h> !! 35 #include <linux/syscalls.h>
13 #include <frame_kern.h> !! 36 #include <linux/errno.h>
14 #include <kern_util.h> !! 37 #include <linux/wait.h>
15 #include <os.h> !! 38 #include <linux/ptrace.h>
>> 39 #include <linux/unistd.h>
>> 40 #include <linux/stddef.h>
>> 41 #include <linux/highuid.h>
>> 42 #include <linux/personality.h>
>> 43 #include <linux/tty.h>
>> 44 #include <linux/binfmts.h>
>> 45 #include <linux/extable.h>
>> 46 #include <linux/resume_user_mode.h>
>> 47
>> 48 #include <asm/setup.h>
>> 49 #include <linux/uaccess.h>
>> 50 #include <asm/traps.h>
>> 51 #include <asm/ucontext.h>
>> 52 #include <asm/cacheflush.h>
>> 53
>> 54 #include "signal.h"
>> 55
>> 56 #ifdef CONFIG_MMU
>> 57
>> 58 /*
>> 59 * Handle the slight differences in classic 68k and ColdFire trap frames.
>> 60 */
>> 61 #ifdef CONFIG_COLDFIRE
>> 62 #define FORMAT 4
>> 63 #define FMT4SIZE 0
>> 64 #else
>> 65 #define FORMAT 0
>> 66 #define FMT4SIZE sizeof_field(struct frame, un.fmt4)
>> 67 #endif
>> 68
>> 69 static const int frame_size_change[16] = {
>> 70 [1] = -1, /* sizeof_field(struct frame, un.fmt1), */
>> 71 [2] = sizeof_field(struct frame, un.fmt2),
>> 72 [3] = sizeof_field(struct frame, un.fmt3),
>> 73 [4] = FMT4SIZE,
>> 74 [5] = -1, /* sizeof_field(struct frame, un.fmt5), */
>> 75 [6] = -1, /* sizeof_field(struct frame, un.fmt6), */
>> 76 [7] = sizeof_field(struct frame, un.fmt7),
>> 77 [8] = -1, /* sizeof_field(struct frame, un.fmt8), */
>> 78 [9] = sizeof_field(struct frame, un.fmt9),
>> 79 [10] = sizeof_field(struct frame, un.fmta),
>> 80 [11] = sizeof_field(struct frame, un.fmtb),
>> 81 [12] = -1, /* sizeof_field(struct frame, un.fmtc), */
>> 82 [13] = -1, /* sizeof_field(struct frame, un.fmtd), */
>> 83 [14] = -1, /* sizeof_field(struct frame, un.fmte), */
>> 84 [15] = -1, /* sizeof_field(struct frame, un.fmtf), */
>> 85 };
>> 86
>> 87 static inline int frame_extra_sizes(int f)
>> 88 {
>> 89 return frame_size_change[f];
>> 90 }
>> 91
>> 92 int fixup_exception(struct pt_regs *regs)
>> 93 {
>> 94 const struct exception_table_entry *fixup;
>> 95 struct pt_regs *tregs;
>> 96
>> 97 /* Are we prepared to handle this kernel fault? */
>> 98 fixup = search_exception_tables(regs->pc);
>> 99 if (!fixup)
>> 100 return 0;
>> 101
>> 102 /* Create a new four word stack frame, discarding the old one. */
>> 103 regs->stkadj = frame_extra_sizes(regs->format);
>> 104 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
>> 105 tregs->vector = regs->vector;
>> 106 tregs->format = FORMAT;
>> 107 tregs->pc = fixup->fixup;
>> 108 tregs->sr = regs->sr;
>> 109
>> 110 return 1;
>> 111 }
>> 112
>> 113 static inline void push_cache (unsigned long vaddr)
>> 114 {
>> 115 /*
>> 116 * Using the old cache_push_v() was really a big waste.
>> 117 *
>> 118 * What we are trying to do is to flush 8 bytes to ram.
>> 119 * Flushing 2 cache lines of 16 bytes is much cheaper than
>> 120 * flushing 1 or 2 pages, as previously done in
>> 121 * cache_push_v().
>> 122 * Jes
>> 123 */
>> 124 if (CPU_IS_040) {
>> 125 unsigned long temp;
>> 126
>> 127 __asm__ __volatile__ (".chip 68040\n\t"
>> 128 "nop\n\t"
>> 129 "ptestr (%1)\n\t"
>> 130 "movec %%mmusr,%0\n\t"
>> 131 ".chip 68k"
>> 132 : "=r" (temp)
>> 133 : "a" (vaddr));
>> 134
>> 135 temp &= PAGE_MASK;
>> 136 temp |= vaddr & ~PAGE_MASK;
>> 137
>> 138 __asm__ __volatile__ (".chip 68040\n\t"
>> 139 "nop\n\t"
>> 140 "cpushl %%bc,(%0)\n\t"
>> 141 ".chip 68k"
>> 142 : : "a" (temp));
>> 143 }
>> 144 else if (CPU_IS_060) {
>> 145 unsigned long temp;
>> 146 __asm__ __volatile__ (".chip 68060\n\t"
>> 147 "plpar (%0)\n\t"
>> 148 ".chip 68k"
>> 149 : "=a" (temp)
>> 150 : "" (vaddr));
>> 151 __asm__ __volatile__ (".chip 68060\n\t"
>> 152 "cpushl %%bc,(%0)\n\t"
>> 153 ".chip 68k"
>> 154 : : "a" (temp));
>> 155 } else if (!CPU_IS_COLDFIRE) {
>> 156 /*
>> 157 * 68030/68020 have no writeback cache;
>> 158 * still need to clear icache.
>> 159 * Note that vaddr is guaranteed to be long word aligned.
>> 160 */
>> 161 unsigned long temp;
>> 162 asm volatile ("movec %%cacr,%0" : "=r" (temp));
>> 163 temp += 4;
>> 164 asm volatile ("movec %0,%%caar\n\t"
>> 165 "movec %1,%%cacr"
>> 166 : : "r" (vaddr), "r" (temp));
>> 167 asm volatile ("movec %0,%%caar\n\t"
>> 168 "movec %1,%%cacr"
>> 169 : : "r" (vaddr + 4), "r" (temp));
>> 170 } else {
>> 171 /* CPU_IS_COLDFIRE */
>> 172 #if defined(CONFIG_CACHE_COPYBACK)
>> 173 flush_cf_dcache(0, DCACHE_MAX_ADDR);
>> 174 #endif
>> 175 /* Invalidate instruction cache for the pushed bytes */
>> 176 clear_cf_icache(vaddr, vaddr + 8);
>> 177 }
>> 178 }
16 179
17 EXPORT_SYMBOL(block_signals); !! 180 static inline void adjustformat(struct pt_regs *regs)
18 EXPORT_SYMBOL(unblock_signals); !! 181 {
>> 182 }
19 183
20 void block_signals_trace(void) !! 184 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
21 { 185 {
22 block_signals(); <<
23 if (current_thread_info()) <<
24 trace_hardirqs_off(); <<
25 } 186 }
26 187
27 void unblock_signals_trace(void) !! 188 #else /* CONFIG_MMU */
>> 189
>> 190 void ret_from_user_signal(void);
>> 191 void ret_from_user_rt_signal(void);
>> 192
>> 193 static inline int frame_extra_sizes(int f)
28 { 194 {
29 if (current_thread_info()) !! 195 /* No frame size adjustments required on non-MMU CPUs */
30 trace_hardirqs_on(); !! 196 return 0;
31 unblock_signals(); <<
32 } 197 }
33 198
34 void um_trace_signals_on(void) !! 199 static inline void adjustformat(struct pt_regs *regs)
35 { 200 {
36 if (current_thread_info()) !! 201 /*
37 trace_hardirqs_on(); !! 202 * set format byte to make stack appear modulo 4, which it will
>> 203 * be when doing the rte
>> 204 */
>> 205 regs->format = 0x4;
38 } 206 }
39 207
40 void um_trace_signals_off(void) !! 208 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
41 { 209 {
42 if (current_thread_info()) !! 210 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
43 trace_hardirqs_off(); <<
44 } 211 }
45 212
>> 213 static inline void push_cache(unsigned long vaddr)
>> 214 {
>> 215 }
>> 216
>> 217 #endif /* CONFIG_MMU */
>> 218
46 /* 219 /*
47 * OK, we're invoking a handler !! 220 * Do a signal return; undo the signal stack.
>> 221 *
>> 222 * Keep the return code on the stack quadword aligned!
>> 223 * That makes the cache flush below easier.
48 */ 224 */
49 static void handle_signal(struct ksignal *ksig !! 225
>> 226 struct sigframe
50 { 227 {
51 sigset_t *oldset = sigmask_to_save(); !! 228 char __user *pretcode;
52 int singlestep = 0; !! 229 int sig;
53 unsigned long sp; !! 230 int code;
>> 231 struct sigcontext __user *psc;
>> 232 char retcode[8];
>> 233 unsigned long extramask[_NSIG_WORDS-1];
>> 234 struct sigcontext sc;
>> 235 };
>> 236
>> 237 struct rt_sigframe
>> 238 {
>> 239 char __user *pretcode;
>> 240 int sig;
>> 241 struct siginfo __user *pinfo;
>> 242 void __user *puc;
>> 243 char retcode[8];
>> 244 struct siginfo info;
>> 245 struct ucontext uc;
>> 246 };
>> 247
>> 248 #define FPCONTEXT_SIZE 216
>> 249 #define uc_fpstate uc_filler[0]
>> 250 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
>> 251 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
>> 252
>> 253 #ifdef CONFIG_FPU
>> 254
>> 255 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
>> 256
>> 257 static inline int restore_fpu_state(struct sigcontext *sc)
>> 258 {
>> 259 int err = 1;
>> 260
>> 261 if (FPU_IS_EMU) {
>> 262 /* restore registers */
>> 263 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
>> 264 memcpy(current->thread.fp, sc->sc_fpregs, 24);
>> 265 return 0;
>> 266 }
>> 267
>> 268 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
>> 269 /* Verify the frame format. */
>> 270 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
>> 271 (sc->sc_fpstate[0] != fpu_version))
>> 272 goto out;
>> 273 if (CPU_IS_020_OR_030) {
>> 274 if (m68k_fputype & FPU_68881 &&
>> 275 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
>> 276 goto out;
>> 277 if (m68k_fputype & FPU_68882 &&
>> 278 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
>> 279 goto out;
>> 280 } else if (CPU_IS_040) {
>> 281 if (!(sc->sc_fpstate[1] == 0x00 ||
>> 282 sc->sc_fpstate[1] == 0x28 ||
>> 283 sc->sc_fpstate[1] == 0x60))
>> 284 goto out;
>> 285 } else if (CPU_IS_060) {
>> 286 if (!(sc->sc_fpstate[3] == 0x00 ||
>> 287 sc->sc_fpstate[3] == 0x60 ||
>> 288 sc->sc_fpstate[3] == 0xe0))
>> 289 goto out;
>> 290 } else if (CPU_IS_COLDFIRE) {
>> 291 if (!(sc->sc_fpstate[0] == 0x00 ||
>> 292 sc->sc_fpstate[0] == 0x05 ||
>> 293 sc->sc_fpstate[0] == 0xe5))
>> 294 goto out;
>> 295 } else
>> 296 goto out;
>> 297
>> 298 if (CPU_IS_COLDFIRE) {
>> 299 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
>> 300 "fmovel %1,%%fpcr\n\t"
>> 301 "fmovel %2,%%fpsr\n\t"
>> 302 "fmovel %3,%%fpiar"
>> 303 : /* no outputs */
>> 304 : "m" (sc->sc_fpregs[0]),
>> 305 "m" (sc->sc_fpcntl[0]),
>> 306 "m" (sc->sc_fpcntl[1]),
>> 307 "m" (sc->sc_fpcntl[2]));
>> 308 } else {
>> 309 __asm__ volatile (".chip 68k/68881\n\t"
>> 310 "fmovemx %0,%%fp0-%%fp1\n\t"
>> 311 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
>> 312 ".chip 68k"
>> 313 : /* no outputs */
>> 314 : "m" (*sc->sc_fpregs),
>> 315 "m" (*sc->sc_fpcntl));
>> 316 }
>> 317 }
>> 318
>> 319 if (CPU_IS_COLDFIRE) {
>> 320 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
>> 321 } else {
>> 322 __asm__ volatile (".chip 68k/68881\n\t"
>> 323 "frestore %0\n\t"
>> 324 ".chip 68k"
>> 325 : : "m" (*sc->sc_fpstate));
>> 326 }
>> 327 err = 0;
>> 328
>> 329 out:
>> 330 return err;
>> 331 }
>> 332
>> 333 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
>> 334 {
>> 335 unsigned char fpstate[FPCONTEXT_SIZE];
>> 336 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
>> 337 fpregset_t fpregs;
>> 338 int err = 1;
>> 339
>> 340 if (FPU_IS_EMU) {
>> 341 /* restore fpu control register */
>> 342 if (__copy_from_user(current->thread.fpcntl,
>> 343 uc->uc_mcontext.fpregs.f_fpcntl, 12))
>> 344 goto out;
>> 345 /* restore all other fpu register */
>> 346 if (__copy_from_user(current->thread.fp,
>> 347 uc->uc_mcontext.fpregs.f_fpregs, 96))
>> 348 goto out;
>> 349 return 0;
>> 350 }
>> 351
>> 352 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
>> 353 goto out;
>> 354 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
>> 355 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
>> 356 context_size = fpstate[1];
>> 357 /* Verify the frame format. */
>> 358 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
>> 359 (fpstate[0] != fpu_version))
>> 360 goto out;
>> 361 if (CPU_IS_020_OR_030) {
>> 362 if (m68k_fputype & FPU_68881 &&
>> 363 !(context_size == 0x18 || context_size == 0xb4))
>> 364 goto out;
>> 365 if (m68k_fputype & FPU_68882 &&
>> 366 !(context_size == 0x38 || context_size == 0xd4))
>> 367 goto out;
>> 368 } else if (CPU_IS_040) {
>> 369 if (!(context_size == 0x00 ||
>> 370 context_size == 0x28 ||
>> 371 context_size == 0x60))
>> 372 goto out;
>> 373 } else if (CPU_IS_060) {
>> 374 if (!(fpstate[3] == 0x00 ||
>> 375 fpstate[3] == 0x60 ||
>> 376 fpstate[3] == 0xe0))
>> 377 goto out;
>> 378 } else if (CPU_IS_COLDFIRE) {
>> 379 if (!(fpstate[3] == 0x00 ||
>> 380 fpstate[3] == 0x05 ||
>> 381 fpstate[3] == 0xe5))
>> 382 goto out;
>> 383 } else
>> 384 goto out;
>> 385 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
>> 386 sizeof(fpregs)))
>> 387 goto out;
>> 388
>> 389 if (CPU_IS_COLDFIRE) {
>> 390 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
>> 391 "fmovel %1,%%fpcr\n\t"
>> 392 "fmovel %2,%%fpsr\n\t"
>> 393 "fmovel %3,%%fpiar"
>> 394 : /* no outputs */
>> 395 : "m" (fpregs.f_fpregs[0]),
>> 396 "m" (fpregs.f_fpcntl[0]),
>> 397 "m" (fpregs.f_fpcntl[1]),
>> 398 "m" (fpregs.f_fpcntl[2]));
>> 399 } else {
>> 400 __asm__ volatile (".chip 68k/68881\n\t"
>> 401 "fmovemx %0,%%fp0-%%fp7\n\t"
>> 402 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
>> 403 ".chip 68k"
>> 404 : /* no outputs */
>> 405 : "m" (*fpregs.f_fpregs),
>> 406 "m" (*fpregs.f_fpcntl));
>> 407 }
>> 408 }
>> 409 if (context_size &&
>> 410 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
>> 411 context_size))
>> 412 goto out;
>> 413
>> 414 if (CPU_IS_COLDFIRE) {
>> 415 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
>> 416 } else {
>> 417 __asm__ volatile (".chip 68k/68881\n\t"
>> 418 "frestore %0\n\t"
>> 419 ".chip 68k"
>> 420 : : "m" (*fpstate));
>> 421 }
>> 422 err = 0;
>> 423
>> 424 out:
>> 425 return err;
>> 426 }
>> 427
>> 428 /*
>> 429 * Set up a signal frame.
>> 430 */
>> 431 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
>> 432 {
>> 433 if (FPU_IS_EMU) {
>> 434 /* save registers */
>> 435 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
>> 436 memcpy(sc->sc_fpregs, current->thread.fp, 24);
>> 437 return;
>> 438 }
>> 439
>> 440 if (CPU_IS_COLDFIRE) {
>> 441 __asm__ volatile ("fsave %0"
>> 442 : : "m" (*sc->sc_fpstate) : "memory");
>> 443 } else {
>> 444 __asm__ volatile (".chip 68k/68881\n\t"
>> 445 "fsave %0\n\t"
>> 446 ".chip 68k"
>> 447 : : "m" (*sc->sc_fpstate) : "memory");
>> 448 }
>> 449
>> 450 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
>> 451 fpu_version = sc->sc_fpstate[0];
>> 452 if (CPU_IS_020_OR_030 && !regs->stkadj &&
>> 453 regs->vector >= (VEC_FPBRUC * 4) &&
>> 454 regs->vector <= (VEC_FPNAN * 4)) {
>> 455 /* Clear pending exception in 68882 idle frame */
>> 456 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
>> 457 sc->sc_fpstate[0x38] |= 1 << 3;
>> 458 }
>> 459
>> 460 if (CPU_IS_COLDFIRE) {
>> 461 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
>> 462 "fmovel %%fpcr,%1\n\t"
>> 463 "fmovel %%fpsr,%2\n\t"
>> 464 "fmovel %%fpiar,%3"
>> 465 : "=m" (sc->sc_fpregs[0]),
>> 466 "=m" (sc->sc_fpcntl[0]),
>> 467 "=m" (sc->sc_fpcntl[1]),
>> 468 "=m" (sc->sc_fpcntl[2])
>> 469 : /* no inputs */
>> 470 : "memory");
>> 471 } else {
>> 472 __asm__ volatile (".chip 68k/68881\n\t"
>> 473 "fmovemx %%fp0-%%fp1,%0\n\t"
>> 474 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
>> 475 ".chip 68k"
>> 476 : "=m" (*sc->sc_fpregs),
>> 477 "=m" (*sc->sc_fpcntl)
>> 478 : /* no inputs */
>> 479 : "memory");
>> 480 }
>> 481 }
>> 482 }
>> 483
>> 484 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
>> 485 {
>> 486 unsigned char fpstate[FPCONTEXT_SIZE];
>> 487 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
>> 488 int err = 0;
>> 489
>> 490 if (FPU_IS_EMU) {
>> 491 /* save fpu control register */
>> 492 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
>> 493 current->thread.fpcntl, 12);
>> 494 /* save all other fpu register */
>> 495 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
>> 496 current->thread.fp, 96);
>> 497 return err;
>> 498 }
>> 499
>> 500 if (CPU_IS_COLDFIRE) {
>> 501 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
>> 502 } else {
>> 503 __asm__ volatile (".chip 68k/68881\n\t"
>> 504 "fsave %0\n\t"
>> 505 ".chip 68k"
>> 506 : : "m" (*fpstate) : "memory");
>> 507 }
>> 508
>> 509 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
>> 510 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
>> 511 fpregset_t fpregs;
>> 512 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
>> 513 context_size = fpstate[1];
>> 514 fpu_version = fpstate[0];
>> 515 if (CPU_IS_020_OR_030 && !regs->stkadj &&
>> 516 regs->vector >= (VEC_FPBRUC * 4) &&
>> 517 regs->vector <= (VEC_FPNAN * 4)) {
>> 518 /* Clear pending exception in 68882 idle frame */
>> 519 if (*(unsigned short *) fpstate == 0x1f38)
>> 520 fpstate[0x38] |= 1 << 3;
>> 521 }
>> 522 if (CPU_IS_COLDFIRE) {
>> 523 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
>> 524 "fmovel %%fpcr,%1\n\t"
>> 525 "fmovel %%fpsr,%2\n\t"
>> 526 "fmovel %%fpiar,%3"
>> 527 : "=m" (fpregs.f_fpregs[0]),
>> 528 "=m" (fpregs.f_fpcntl[0]),
>> 529 "=m" (fpregs.f_fpcntl[1]),
>> 530 "=m" (fpregs.f_fpcntl[2])
>> 531 : /* no inputs */
>> 532 : "memory");
>> 533 } else {
>> 534 __asm__ volatile (".chip 68k/68881\n\t"
>> 535 "fmovemx %%fp0-%%fp7,%0\n\t"
>> 536 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
>> 537 ".chip 68k"
>> 538 : "=m" (*fpregs.f_fpregs),
>> 539 "=m" (*fpregs.f_fpcntl)
>> 540 : /* no inputs */
>> 541 : "memory");
>> 542 }
>> 543 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
>> 544 sizeof(fpregs));
>> 545 }
>> 546 if (context_size)
>> 547 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
>> 548 context_size);
>> 549 return err;
>> 550 }
>> 551
>> 552 #else /* CONFIG_FPU */
>> 553
>> 554 /*
>> 555 * For the case with no FPU configured these all do nothing.
>> 556 */
>> 557 static inline int restore_fpu_state(struct sigcontext *sc)
>> 558 {
>> 559 return 0;
>> 560 }
>> 561
>> 562 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
>> 563 {
>> 564 return 0;
>> 565 }
>> 566
>> 567 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
>> 568 {
>> 569 }
>> 570
>> 571 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
>> 572 {
>> 573 return 0;
>> 574 }
>> 575
>> 576 #endif /* CONFIG_FPU */
>> 577
>> 578 static inline void siginfo_build_tests(void)
>> 579 {
>> 580 /*
>> 581 * This needs to be tested on m68k as it has a lesser
>> 582 * alignment requirement than x86 and that can cause surprises.
>> 583 */
>> 584
>> 585 /* This is part of the ABI and can never change in size: */
>> 586 BUILD_BUG_ON(sizeof(siginfo_t) != 128);
>> 587
>> 588 /* Ensure the known fields never change in location */
>> 589 BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0);
>> 590 BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4);
>> 591 BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8);
>> 592
>> 593 /* _kill */
>> 594 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
>> 595 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
>> 596
>> 597 /* _timer */
>> 598 BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c);
>> 599 BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10);
>> 600 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
>> 601
>> 602 /* _rt */
>> 603 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
>> 604 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
>> 605 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
>> 606
>> 607 /* _sigchld */
>> 608 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
>> 609 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
>> 610 BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14);
>> 611 BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18);
>> 612 BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c);
>> 613
>> 614 /* _sigfault */
>> 615 BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c);
>> 616
>> 617 /* _sigfault._mcerr */
>> 618 BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10);
>> 619
>> 620 /* _sigfault._addr_bnd */
>> 621 BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12);
>> 622 BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16);
>> 623
>> 624 /* _sigfault._addr_pkey */
>> 625 BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12);
>> 626
>> 627 /* _sigfault._perf */
>> 628 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x10);
>> 629 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14);
>> 630 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x18);
>> 631
>> 632 /* _sigpoll */
>> 633 BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c);
>> 634 BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
>> 635
>> 636 /* _sigsys */
>> 637 BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c);
>> 638 BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
>> 639 BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
>> 640
>> 641 /* any new si_fields should be added here */
>> 642 }
>> 643
>> 644 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
>> 645 void __user *fp)
>> 646 {
>> 647 int extra = frame_extra_sizes(formatvec >> 12);
>> 648 char buf[sizeof_field(struct frame, un)];
>> 649
>> 650 if (extra < 0) {
>> 651 /*
>> 652 * user process trying to return with weird frame format
>> 653 */
>> 654 pr_debug("user process returning with weird frame format\n");
>> 655 return -1;
>> 656 }
>> 657 if (extra && copy_from_user(buf, fp, extra))
>> 658 return -1;
>> 659 regs->format = formatvec >> 12;
>> 660 regs->vector = formatvec & 0xfff;
>> 661 if (extra) {
>> 662 void *p = (struct switch_stack *)regs - 1;
>> 663 struct frame *new = (void *)regs - extra;
>> 664 int size = sizeof(struct pt_regs)+sizeof(struct switch_stack);
>> 665
>> 666 memmove(p - extra, p, size);
>> 667 memcpy(p - extra + size, buf, extra);
>> 668 current->thread.esp0 = (unsigned long)&new->ptregs;
>> 669 #ifdef CONFIG_M68040
>> 670 /* on 68040 complete pending writebacks if any */
>> 671 if (new->ptregs.format == 7) // bus error frame
>> 672 berr_040cleanup(new);
>> 673 #endif
>> 674 }
>> 675 return extra;
>> 676 }
>> 677
>> 678 static inline int
>> 679 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
>> 680 {
>> 681 int formatvec;
>> 682 struct sigcontext context;
>> 683
>> 684 siginfo_build_tests();
>> 685
>> 686 /* Always make any pending restarted system calls return -EINTR */
>> 687 current->restart_block.fn = do_no_restart_syscall;
>> 688
>> 689 /* get previous context */
>> 690 if (copy_from_user(&context, usc, sizeof(context)))
>> 691 return -1;
>> 692
>> 693 /* restore passed registers */
>> 694 regs->d0 = context.sc_d0;
>> 695 regs->d1 = context.sc_d1;
>> 696 regs->a0 = context.sc_a0;
>> 697 regs->a1 = context.sc_a1;
>> 698 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
>> 699 regs->pc = context.sc_pc;
>> 700 regs->orig_d0 = -1; /* disable syscall checks */
>> 701 wrusp(context.sc_usp);
>> 702 formatvec = context.sc_formatvec;
>> 703
>> 704 if (restore_fpu_state(&context))
>> 705 return -1;
>> 706
>> 707 return mangle_kernel_stack(regs, formatvec, fp);
>> 708 }
>> 709
>> 710 static inline int
>> 711 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
>> 712 struct ucontext __user *uc)
>> 713 {
>> 714 int temp;
>> 715 greg_t __user *gregs = uc->uc_mcontext.gregs;
>> 716 unsigned long usp;
54 int err; 717 int err;
55 718
56 if (test_thread_flag(TIF_SINGLESTEP) & !! 719 /* Always make any pending restarted system calls return -EINTR */
57 singlestep = 1; !! 720 current->restart_block.fn = do_no_restart_syscall;
58 721
59 /* Did we come from a system call? */ !! 722 err = __get_user(temp, &uc->uc_mcontext.version);
60 if (PT_REGS_SYSCALL_NR(regs) >= 0) { !! 723 if (temp != MCONTEXT_VERSION)
61 /* If so, check system call re !! 724 return -1;
62 switch (PT_REGS_SYSCALL_RET(re !! 725 /* restore passed registers */
63 case -ERESTART_RESTARTBLOCK: !! 726 err |= __get_user(regs->d0, &gregs[0]);
64 case -ERESTARTNOHAND: !! 727 err |= __get_user(regs->d1, &gregs[1]);
65 PT_REGS_SYSCALL_RET(re !! 728 err |= __get_user(regs->d2, &gregs[2]);
>> 729 err |= __get_user(regs->d3, &gregs[3]);
>> 730 err |= __get_user(regs->d4, &gregs[4]);
>> 731 err |= __get_user(regs->d5, &gregs[5]);
>> 732 err |= __get_user(sw->d6, &gregs[6]);
>> 733 err |= __get_user(sw->d7, &gregs[7]);
>> 734 err |= __get_user(regs->a0, &gregs[8]);
>> 735 err |= __get_user(regs->a1, &gregs[9]);
>> 736 err |= __get_user(regs->a2, &gregs[10]);
>> 737 err |= __get_user(sw->a3, &gregs[11]);
>> 738 err |= __get_user(sw->a4, &gregs[12]);
>> 739 err |= __get_user(sw->a5, &gregs[13]);
>> 740 err |= __get_user(sw->a6, &gregs[14]);
>> 741 err |= __get_user(usp, &gregs[15]);
>> 742 wrusp(usp);
>> 743 err |= __get_user(regs->pc, &gregs[16]);
>> 744 err |= __get_user(temp, &gregs[17]);
>> 745 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
>> 746 regs->orig_d0 = -1; /* disable syscall checks */
>> 747 err |= __get_user(temp, &uc->uc_formatvec);
>> 748
>> 749 err |= rt_restore_fpu_state(uc);
>> 750 err |= restore_altstack(&uc->uc_stack);
>> 751
>> 752 if (err)
>> 753 return -1;
>> 754
>> 755 return mangle_kernel_stack(regs, temp, &uc->uc_extra);
>> 756 }
>> 757
>> 758 asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
>> 759 {
>> 760 unsigned long usp = rdusp();
>> 761 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
>> 762 sigset_t set;
>> 763 int size;
>> 764
>> 765 if (!access_ok(frame, sizeof(*frame)))
>> 766 goto badframe;
>> 767 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
>> 768 (_NSIG_WORDS > 1 &&
>> 769 __copy_from_user(&set.sig[1], &frame->extramask,
>> 770 sizeof(frame->extramask))))
>> 771 goto badframe;
>> 772
>> 773 set_current_blocked(&set);
>> 774
>> 775 size = restore_sigcontext(regs, &frame->sc, frame + 1);
>> 776 if (size < 0)
>> 777 goto badframe;
>> 778 return (void *)sw - size;
>> 779
>> 780 badframe:
>> 781 force_sig(SIGSEGV);
>> 782 return sw;
>> 783 }
>> 784
>> 785 asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
>> 786 {
>> 787 unsigned long usp = rdusp();
>> 788 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
>> 789 sigset_t set;
>> 790 int size;
>> 791
>> 792 if (!access_ok(frame, sizeof(*frame)))
>> 793 goto badframe;
>> 794 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
>> 795 goto badframe;
>> 796
>> 797 set_current_blocked(&set);
>> 798
>> 799 size = rt_restore_ucontext(regs, sw, &frame->uc);
>> 800 if (size < 0)
>> 801 goto badframe;
>> 802 return (void *)sw - size;
>> 803
>> 804 badframe:
>> 805 force_sig(SIGSEGV);
>> 806 return sw;
>> 807 }
>> 808
>> 809 static inline struct pt_regs *rte_regs(struct pt_regs *regs)
>> 810 {
>> 811 return (void *)regs + regs->stkadj;
>> 812 }
>> 813
>> 814 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
>> 815 unsigned long mask)
>> 816 {
>> 817 struct pt_regs *tregs = rte_regs(regs);
>> 818 sc->sc_mask = mask;
>> 819 sc->sc_usp = rdusp();
>> 820 sc->sc_d0 = regs->d0;
>> 821 sc->sc_d1 = regs->d1;
>> 822 sc->sc_a0 = regs->a0;
>> 823 sc->sc_a1 = regs->a1;
>> 824 sc->sc_sr = tregs->sr;
>> 825 sc->sc_pc = tregs->pc;
>> 826 sc->sc_formatvec = tregs->format << 12 | tregs->vector;
>> 827 save_a5_state(sc, regs);
>> 828 save_fpu_state(sc, regs);
>> 829 }
>> 830
>> 831 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
>> 832 {
>> 833 struct switch_stack *sw = (struct switch_stack *)regs - 1;
>> 834 struct pt_regs *tregs = rte_regs(regs);
>> 835 greg_t __user *gregs = uc->uc_mcontext.gregs;
>> 836 int err = 0;
>> 837
>> 838 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
>> 839 err |= __put_user(regs->d0, &gregs[0]);
>> 840 err |= __put_user(regs->d1, &gregs[1]);
>> 841 err |= __put_user(regs->d2, &gregs[2]);
>> 842 err |= __put_user(regs->d3, &gregs[3]);
>> 843 err |= __put_user(regs->d4, &gregs[4]);
>> 844 err |= __put_user(regs->d5, &gregs[5]);
>> 845 err |= __put_user(sw->d6, &gregs[6]);
>> 846 err |= __put_user(sw->d7, &gregs[7]);
>> 847 err |= __put_user(regs->a0, &gregs[8]);
>> 848 err |= __put_user(regs->a1, &gregs[9]);
>> 849 err |= __put_user(regs->a2, &gregs[10]);
>> 850 err |= __put_user(sw->a3, &gregs[11]);
>> 851 err |= __put_user(sw->a4, &gregs[12]);
>> 852 err |= __put_user(sw->a5, &gregs[13]);
>> 853 err |= __put_user(sw->a6, &gregs[14]);
>> 854 err |= __put_user(rdusp(), &gregs[15]);
>> 855 err |= __put_user(tregs->pc, &gregs[16]);
>> 856 err |= __put_user(tregs->sr, &gregs[17]);
>> 857 err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec);
>> 858 err |= rt_save_fpu_state(uc, regs);
>> 859 return err;
>> 860 }
>> 861
>> 862 static inline void __user *
>> 863 get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size)
>> 864 {
>> 865 unsigned long usp = sigsp(rdusp(), ksig);
>> 866 unsigned long gap = 0;
>> 867
>> 868 if (CPU_IS_020_OR_030 && tregs->format == 0xb) {
>> 869 /* USP is unreliable so use worst-case value */
>> 870 gap = 256;
>> 871 }
>> 872
>> 873 return (void __user *)((usp - gap - frame_size) & -8UL);
>> 874 }
>> 875
>> 876 static int setup_frame(struct ksignal *ksig, sigset_t *set,
>> 877 struct pt_regs *regs)
>> 878 {
>> 879 struct sigframe __user *frame;
>> 880 struct pt_regs *tregs = rte_regs(regs);
>> 881 int fsize = frame_extra_sizes(tregs->format);
>> 882 struct sigcontext context;
>> 883 int err = 0, sig = ksig->sig;
>> 884
>> 885 if (fsize < 0) {
>> 886 pr_debug("setup_frame: Unknown frame format %#x\n",
>> 887 tregs->format);
>> 888 return -EFAULT;
>> 889 }
>> 890
>> 891 frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize);
>> 892
>> 893 if (fsize)
>> 894 err |= copy_to_user (frame + 1, regs + 1, fsize);
>> 895
>> 896 err |= __put_user(sig, &frame->sig);
>> 897
>> 898 err |= __put_user(tregs->vector, &frame->code);
>> 899 err |= __put_user(&frame->sc, &frame->psc);
>> 900
>> 901 if (_NSIG_WORDS > 1)
>> 902 err |= copy_to_user(frame->extramask, &set->sig[1],
>> 903 sizeof(frame->extramask));
>> 904
>> 905 setup_sigcontext(&context, regs, set->sig[0]);
>> 906 err |= copy_to_user (&frame->sc, &context, sizeof(context));
>> 907
>> 908 /* Set up to return from userspace. */
>> 909 #ifdef CONFIG_MMU
>> 910 err |= __put_user(frame->retcode, &frame->pretcode);
>> 911 /* moveq #,d0; trap #0 */
>> 912 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
>> 913 (long __user *)(frame->retcode));
>> 914 #else
>> 915 err |= __put_user((long) ret_from_user_signal,
>> 916 (long __user *) &frame->pretcode);
>> 917 #endif
>> 918
>> 919 if (err)
>> 920 return -EFAULT;
>> 921
>> 922 push_cache ((unsigned long) &frame->retcode);
>> 923
>> 924 /*
>> 925 * This is subtle; if we build more than one sigframe, all but the
>> 926 * first one will see frame format 0 and have fsize == 0, so we won't
>> 927 * screw stkadj.
>> 928 */
>> 929 if (fsize) {
>> 930 regs->stkadj = fsize;
>> 931 tregs = rte_regs(regs);
>> 932 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
>> 933 tregs->vector = 0;
>> 934 tregs->format = 0;
>> 935 tregs->sr = regs->sr;
>> 936 }
>> 937
>> 938 /*
>> 939 * Set up registers for signal handler. All the state we are about
>> 940 * to destroy is successfully copied to sigframe.
>> 941 */
>> 942 wrusp ((unsigned long) frame);
>> 943 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
>> 944 adjustformat(regs);
>> 945
>> 946 return 0;
>> 947 }
>> 948
>> 949 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
>> 950 struct pt_regs *regs)
>> 951 {
>> 952 struct rt_sigframe __user *frame;
>> 953 struct pt_regs *tregs = rte_regs(regs);
>> 954 int fsize = frame_extra_sizes(tregs->format);
>> 955 int err = 0, sig = ksig->sig;
>> 956
>> 957 if (fsize < 0) {
>> 958 pr_debug("setup_frame: Unknown frame format %#x\n",
>> 959 regs->format);
>> 960 return -EFAULT;
>> 961 }
>> 962
>> 963 frame = get_sigframe(ksig, tregs, sizeof(*frame));
>> 964
>> 965 if (fsize)
>> 966 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
>> 967
>> 968 err |= __put_user(sig, &frame->sig);
>> 969 err |= __put_user(&frame->info, &frame->pinfo);
>> 970 err |= __put_user(&frame->uc, &frame->puc);
>> 971 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
>> 972
>> 973 /* Create the ucontext. */
>> 974 err |= __put_user(0, &frame->uc.uc_flags);
>> 975 err |= __put_user(NULL, &frame->uc.uc_link);
>> 976 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
>> 977 err |= rt_setup_ucontext(&frame->uc, regs);
>> 978 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
>> 979
>> 980 /* Set up to return from userspace. */
>> 981 #ifdef CONFIG_MMU
>> 982 err |= __put_user(frame->retcode, &frame->pretcode);
>> 983 #ifdef __mcoldfire__
>> 984 /* movel #__NR_rt_sigreturn,d0; trap #0 */
>> 985 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
>> 986 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
>> 987 (long __user *)(frame->retcode + 4));
>> 988 #else
>> 989 /* moveq #,d0; notb d0; trap #0 */
>> 990 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
>> 991 (long __user *)(frame->retcode + 0));
>> 992 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
>> 993 #endif
>> 994 #else
>> 995 err |= __put_user((long) ret_from_user_rt_signal,
>> 996 (long __user *) &frame->pretcode);
>> 997 #endif /* CONFIG_MMU */
>> 998
>> 999 if (err)
>> 1000 return -EFAULT;
>> 1001
>> 1002 push_cache ((unsigned long) &frame->retcode);
>> 1003
>> 1004 /*
>> 1005 * This is subtle; if we build more than one sigframe, all but the
>> 1006 * first one will see frame format 0 and have fsize == 0, so we won't
>> 1007 * screw stkadj.
>> 1008 */
>> 1009 if (fsize) {
>> 1010 regs->stkadj = fsize;
>> 1011 tregs = rte_regs(regs);
>> 1012 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
>> 1013 tregs->vector = 0;
>> 1014 tregs->format = 0;
>> 1015 tregs->sr = regs->sr;
>> 1016 }
>> 1017
>> 1018 /*
>> 1019 * Set up registers for signal handler. All the state we are about
>> 1020 * to destroy is successfully copied to sigframe.
>> 1021 */
>> 1022 wrusp ((unsigned long) frame);
>> 1023 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
>> 1024 adjustformat(regs);
>> 1025 return 0;
>> 1026 }
>> 1027
>> 1028 static inline void
>> 1029 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
>> 1030 {
>> 1031 switch (regs->d0) {
>> 1032 case -ERESTARTNOHAND:
>> 1033 if (!has_handler)
>> 1034 goto do_restart;
>> 1035 regs->d0 = -EINTR;
>> 1036 break;
>> 1037
>> 1038 case -ERESTART_RESTARTBLOCK:
>> 1039 if (!has_handler) {
>> 1040 regs->d0 = __NR_restart_syscall;
>> 1041 regs->pc -= 2;
66 break; 1042 break;
>> 1043 }
>> 1044 regs->d0 = -EINTR;
>> 1045 break;
67 1046
68 case -ERESTARTSYS: !! 1047 case -ERESTARTSYS:
69 if (!(ksig->ka.sa.sa_f !! 1048 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
70 PT_REGS_SYSCAL !! 1049 regs->d0 = -EINTR;
71 break; <<
72 } <<
73 fallthrough; <<
74 case -ERESTARTNOINTR: <<
75 PT_REGS_RESTART_SYSCAL <<
76 PT_REGS_ORIG_SYSCALL(r <<
77 break; 1050 break;
78 } 1051 }
>> 1052 fallthrough;
>> 1053 case -ERESTARTNOINTR:
>> 1054 do_restart:
>> 1055 regs->d0 = regs->orig_d0;
>> 1056 regs->pc -= 2;
>> 1057 break;
79 } 1058 }
>> 1059 }
>> 1060
>> 1061 /*
>> 1062 * OK, we're invoking a handler
>> 1063 */
>> 1064 static void
>> 1065 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
>> 1066 {
>> 1067 sigset_t *oldset = sigmask_to_save();
>> 1068 int err;
>> 1069 /* are we from a system call? */
>> 1070 if (regs->orig_d0 >= 0)
>> 1071 /* If so, check system call restarting.. */
>> 1072 handle_restart(regs, &ksig->ka, 1);
80 1073
81 sp = PT_REGS_SP(regs); !! 1074 /* set up the stack frame */
82 if ((ksig->ka.sa.sa_flags & SA_ONSTACK !! 1075 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
83 sp = current->sas_ss_sp + curr !! 1076 err = setup_rt_frame(ksig, oldset, regs);
84 <<
85 #ifdef CONFIG_ARCH_HAS_SC_SIGNALS <<
86 if (!(ksig->ka.sa.sa_flags & SA_SIGINF <<
87 err = setup_signal_stack_sc(sp <<
88 else 1077 else
89 #endif !! 1078 err = setup_frame(ksig, oldset, regs);
90 err = setup_signal_stack_si(sp !! 1079
>> 1080 signal_setup_done(err, ksig, 0);
91 1081
92 signal_setup_done(err, ksig, singleste !! 1082 if (test_thread_flag(TIF_DELAYED_TRACE)) {
>> 1083 regs->sr &= ~0x8000;
>> 1084 send_sig(SIGTRAP, current, 1);
>> 1085 }
93 } 1086 }
94 1087
95 void do_signal(struct pt_regs *regs) !! 1088 /*
>> 1089 * Note that 'init' is a special process: it doesn't get signals it doesn't
>> 1090 * want to handle. Thus you cannot kill init even with a SIGKILL even by
>> 1091 * mistake.
>> 1092 */
>> 1093 static void do_signal(struct pt_regs *regs)
96 { 1094 {
97 struct ksignal ksig; 1095 struct ksignal ksig;
98 int handled_sig = 0; <<
99 1096
100 while (get_signal(&ksig)) { !! 1097 current->thread.esp0 = (unsigned long) regs;
101 handled_sig = 1; !! 1098
>> 1099 if (get_signal(&ksig)) {
102 /* Whee! Actually deliver the 1100 /* Whee! Actually deliver the signal. */
103 handle_signal(&ksig, regs); 1101 handle_signal(&ksig, regs);
>> 1102 return;
104 } 1103 }
105 1104
106 /* Did we come from a system call? */ 1105 /* Did we come from a system call? */
107 if (!handled_sig && (PT_REGS_SYSCALL_N !! 1106 if (regs->orig_d0 >= 0)
108 /* Restart the system call - n 1107 /* Restart the system call - no handlers present */
109 switch (PT_REGS_SYSCALL_RET(re !! 1108 handle_restart(regs, NULL, 0);
110 case -ERESTARTNOHAND: <<
111 case -ERESTARTSYS: <<
112 case -ERESTARTNOINTR: <<
113 PT_REGS_ORIG_SYSCALL(r <<
114 PT_REGS_RESTART_SYSCAL <<
115 break; <<
116 case -ERESTART_RESTARTBLOCK: <<
117 PT_REGS_ORIG_SYSCALL(r <<
118 PT_REGS_RESTART_SYSCAL <<
119 break; <<
120 } <<
121 } <<
122 1109
123 /* !! 1110 /* If there's no signal to deliver, we just restore the saved mask. */
124 * if there's no signal to deliver, we !! 1111 restore_saved_sigmask();
125 * back !! 1112 }
126 */ !! 1113
127 if (!handled_sig) !! 1114 asmlinkage void do_notify_resume(struct pt_regs *regs)
128 restore_saved_sigmask(); !! 1115 {
>> 1116 if (test_thread_flag(TIF_NOTIFY_SIGNAL) ||
>> 1117 test_thread_flag(TIF_SIGPENDING))
>> 1118 do_signal(regs);
>> 1119
>> 1120 if (test_thread_flag(TIF_NOTIFY_RESUME))
>> 1121 resume_user_mode_work(regs);
129 } 1122 }
130 1123
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