1 /* 2 * Kernel support for the ptrace() and syscall tracing interfaces. 3 * 4 * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc. 5 * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx> 6 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> 7 * Copyright (C) 2008-2016 Helge Deller <deller@gmx.de> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/sched.h> 12 #include <linux/mm.h> 13 #include <linux/smp.h> 14 #include <linux/elf.h> 15 #include <linux/errno.h> 16 #include <linux/ptrace.h> 17 #include <linux/tracehook.h> 18 #include <linux/user.h> 19 #include <linux/personality.h> 20 #include <linux/regset.h> 21 #include <linux/security.h> 22 #include <linux/seccomp.h> 23 #include <linux/compat.h> 24 #include <linux/signal.h> 25 #include <linux/audit.h> 26 27 #include <asm/uaccess.h> 28 #include <asm/pgtable.h> 29 #include <asm/processor.h> 30 #include <asm/asm-offsets.h> 31 32 /* PSW bits we allow the debugger to modify */ 33 #define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB) 34 35 #define CREATE_TRACE_POINTS 36 #include <trace/events/syscalls.h> 37 38 /* 39 * These are our native regset flavors. 40 */ 41 enum parisc_regset { 42 REGSET_GENERAL, 43 REGSET_FP 44 }; 45 46 /* 47 * Called by kernel/ptrace.c when detaching.. 48 * 49 * Make sure single step bits etc are not set. 50 */ 51 void ptrace_disable(struct task_struct *task) 52 { 53 clear_tsk_thread_flag(task, TIF_SINGLESTEP); 54 clear_tsk_thread_flag(task, TIF_BLOCKSTEP); 55 56 /* make sure the trap bits are not set */ 57 pa_psw(task)->r = 0; 58 pa_psw(task)->t = 0; 59 pa_psw(task)->h = 0; 60 pa_psw(task)->l = 0; 61 } 62 63 /* 64 * The following functions are called by ptrace_resume() when 65 * enabling or disabling single/block tracing. 66 */ 67 void user_disable_single_step(struct task_struct *task) 68 { 69 ptrace_disable(task); 70 } 71 72 void user_enable_single_step(struct task_struct *task) 73 { 74 clear_tsk_thread_flag(task, TIF_BLOCKSTEP); 75 set_tsk_thread_flag(task, TIF_SINGLESTEP); 76 77 if (pa_psw(task)->n) { 78 struct siginfo si; 79 80 /* Nullified, just crank over the queue. */ 81 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1]; 82 task_regs(task)->iasq[0] = task_regs(task)->iasq[1]; 83 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4; 84 pa_psw(task)->n = 0; 85 pa_psw(task)->x = 0; 86 pa_psw(task)->y = 0; 87 pa_psw(task)->z = 0; 88 pa_psw(task)->b = 0; 89 ptrace_disable(task); 90 /* Don't wake up the task, but let the 91 parent know something happened. */ 92 si.si_code = TRAP_TRACE; 93 si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3); 94 si.si_signo = SIGTRAP; 95 si.si_errno = 0; 96 force_sig_info(SIGTRAP, &si, task); 97 /* notify_parent(task, SIGCHLD); */ 98 return; 99 } 100 101 /* Enable recovery counter traps. The recovery counter 102 * itself will be set to zero on a task switch. If the 103 * task is suspended on a syscall then the syscall return 104 * path will overwrite the recovery counter with a suitable 105 * value such that it traps once back in user space. We 106 * disable interrupts in the tasks PSW here also, to avoid 107 * interrupts while the recovery counter is decrementing. 108 */ 109 pa_psw(task)->r = 1; 110 pa_psw(task)->t = 0; 111 pa_psw(task)->h = 0; 112 pa_psw(task)->l = 0; 113 } 114 115 void user_enable_block_step(struct task_struct *task) 116 { 117 clear_tsk_thread_flag(task, TIF_SINGLESTEP); 118 set_tsk_thread_flag(task, TIF_BLOCKSTEP); 119 120 /* Enable taken branch trap. */ 121 pa_psw(task)->r = 0; 122 pa_psw(task)->t = 1; 123 pa_psw(task)->h = 0; 124 pa_psw(task)->l = 0; 125 } 126 127 long arch_ptrace(struct task_struct *child, long request, 128 unsigned long addr, unsigned long data) 129 { 130 unsigned long __user *datap = (unsigned long __user *)data; 131 unsigned long tmp; 132 long ret = -EIO; 133 134 switch (request) { 135 136 /* Read the word at location addr in the USER area. For ptraced 137 processes, the kernel saves all regs on a syscall. */ 138 case PTRACE_PEEKUSR: 139 if ((addr & (sizeof(unsigned long)-1)) || 140 addr >= sizeof(struct pt_regs)) 141 break; 142 tmp = *(unsigned long *) ((char *) task_regs(child) + addr); 143 ret = put_user(tmp, datap); 144 break; 145 146 /* Write the word at location addr in the USER area. This will need 147 to change when the kernel no longer saves all regs on a syscall. 148 FIXME. There is a problem at the moment in that r3-r18 are only 149 saved if the process is ptraced on syscall entry, and even then 150 those values are overwritten by actual register values on syscall 151 exit. */ 152 case PTRACE_POKEUSR: 153 /* Some register values written here may be ignored in 154 * entry.S:syscall_restore_rfi; e.g. iaoq is written with 155 * r31/r31+4, and not with the values in pt_regs. 156 */ 157 if (addr == PT_PSW) { 158 /* Allow writing to Nullify, Divide-step-correction, 159 * and carry/borrow bits. 160 * BEWARE, if you set N, and then single step, it won't 161 * stop on the nullified instruction. 162 */ 163 data &= USER_PSW_BITS; 164 task_regs(child)->gr[0] &= ~USER_PSW_BITS; 165 task_regs(child)->gr[0] |= data; 166 ret = 0; 167 break; 168 } 169 170 if ((addr & (sizeof(unsigned long)-1)) || 171 addr >= sizeof(struct pt_regs)) 172 break; 173 if ((addr >= PT_GR1 && addr <= PT_GR31) || 174 addr == PT_IAOQ0 || addr == PT_IAOQ1 || 175 (addr >= PT_FR0 && addr <= PT_FR31 + 4) || 176 addr == PT_SAR) { 177 *(unsigned long *) ((char *) task_regs(child) + addr) = data; 178 ret = 0; 179 } 180 break; 181 182 case PTRACE_GETREGS: /* Get all gp regs from the child. */ 183 return copy_regset_to_user(child, 184 task_user_regset_view(current), 185 REGSET_GENERAL, 186 0, sizeof(struct user_regs_struct), 187 datap); 188 189 case PTRACE_SETREGS: /* Set all gp regs in the child. */ 190 return copy_regset_from_user(child, 191 task_user_regset_view(current), 192 REGSET_GENERAL, 193 0, sizeof(struct user_regs_struct), 194 datap); 195 196 case PTRACE_GETFPREGS: /* Get the child FPU state. */ 197 return copy_regset_to_user(child, 198 task_user_regset_view(current), 199 REGSET_FP, 200 0, sizeof(struct user_fp_struct), 201 datap); 202 203 case PTRACE_SETFPREGS: /* Set the child FPU state. */ 204 return copy_regset_from_user(child, 205 task_user_regset_view(current), 206 REGSET_FP, 207 0, sizeof(struct user_fp_struct), 208 datap); 209 210 default: 211 ret = ptrace_request(child, request, addr, data); 212 break; 213 } 214 215 return ret; 216 } 217 218 219 #ifdef CONFIG_COMPAT 220 221 /* This function is needed to translate 32 bit pt_regs offsets in to 222 * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel 223 * will request offset 12 if it wants gr3, but the lower 32 bits of 224 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4). 225 * This code relies on a 32 bit pt_regs being comprised of 32 bit values 226 * except for the fp registers which (a) are 64 bits, and (b) follow 227 * the gr registers at the start of pt_regs. The 32 bit pt_regs should 228 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[] 229 * being 64 bit in both cases. 230 */ 231 232 static compat_ulong_t translate_usr_offset(compat_ulong_t offset) 233 { 234 if (offset < 0) 235 return sizeof(struct pt_regs); 236 else if (offset <= 32*4) /* gr[0..31] */ 237 return offset * 2 + 4; 238 else if (offset <= 32*4+32*8) /* gr[0..31] + fr[0..31] */ 239 return offset + 32*4; 240 else if (offset < sizeof(struct pt_regs)/2 + 32*4) 241 return offset * 2 + 4 - 32*8; 242 else 243 return sizeof(struct pt_regs); 244 } 245 246 long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 247 compat_ulong_t addr, compat_ulong_t data) 248 { 249 compat_uint_t tmp; 250 long ret = -EIO; 251 252 switch (request) { 253 254 case PTRACE_PEEKUSR: 255 if (addr & (sizeof(compat_uint_t)-1)) 256 break; 257 addr = translate_usr_offset(addr); 258 if (addr >= sizeof(struct pt_regs)) 259 break; 260 261 tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr); 262 ret = put_user(tmp, (compat_uint_t *) (unsigned long) data); 263 break; 264 265 /* Write the word at location addr in the USER area. This will need 266 to change when the kernel no longer saves all regs on a syscall. 267 FIXME. There is a problem at the moment in that r3-r18 are only 268 saved if the process is ptraced on syscall entry, and even then 269 those values are overwritten by actual register values on syscall 270 exit. */ 271 case PTRACE_POKEUSR: 272 /* Some register values written here may be ignored in 273 * entry.S:syscall_restore_rfi; e.g. iaoq is written with 274 * r31/r31+4, and not with the values in pt_regs. 275 */ 276 if (addr == PT_PSW) { 277 /* Since PT_PSW==0, it is valid for 32 bit processes 278 * under 64 bit kernels as well. 279 */ 280 ret = arch_ptrace(child, request, addr, data); 281 } else { 282 if (addr & (sizeof(compat_uint_t)-1)) 283 break; 284 addr = translate_usr_offset(addr); 285 if (addr >= sizeof(struct pt_regs)) 286 break; 287 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) { 288 /* Special case, fp regs are 64 bits anyway */ 289 *(__u64 *) ((char *) task_regs(child) + addr) = data; 290 ret = 0; 291 } 292 else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) || 293 addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 || 294 addr == PT_SAR+4) { 295 /* Zero the top 32 bits */ 296 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0; 297 *(__u32 *) ((char *) task_regs(child) + addr) = data; 298 ret = 0; 299 } 300 } 301 break; 302 303 default: 304 ret = compat_ptrace_request(child, request, addr, data); 305 break; 306 } 307 308 return ret; 309 } 310 #endif 311 312 long do_syscall_trace_enter(struct pt_regs *regs) 313 { 314 /* Do the secure computing check first. */ 315 if (secure_computing() == -1) 316 return -1; 317 318 if (test_thread_flag(TIF_SYSCALL_TRACE) && 319 tracehook_report_syscall_entry(regs)) { 320 /* 321 * Tracing decided this syscall should not happen or the 322 * debugger stored an invalid system call number. Skip 323 * the system call and the system call restart handling. 324 */ 325 regs->gr[20] = -1UL; 326 goto out; 327 } 328 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS 329 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) 330 trace_sys_enter(regs, regs->gr[20]); 331 #endif 332 333 #ifdef CONFIG_64BIT 334 if (!is_compat_task()) 335 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25], 336 regs->gr[24], regs->gr[23]); 337 else 338 #endif 339 audit_syscall_entry(regs->gr[20] & 0xffffffff, 340 regs->gr[26] & 0xffffffff, 341 regs->gr[25] & 0xffffffff, 342 regs->gr[24] & 0xffffffff, 343 regs->gr[23] & 0xffffffff); 344 345 out: 346 /* 347 * Sign extend the syscall number to 64bit since it may have been 348 * modified by a compat ptrace call 349 */ 350 return (int) ((u32) regs->gr[20]); 351 } 352 353 void do_syscall_trace_exit(struct pt_regs *regs) 354 { 355 int stepping = test_thread_flag(TIF_SINGLESTEP) || 356 test_thread_flag(TIF_BLOCKSTEP); 357 358 audit_syscall_exit(regs); 359 360 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS 361 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) 362 trace_sys_exit(regs, regs->gr[20]); 363 #endif 364 365 if (stepping || test_thread_flag(TIF_SYSCALL_TRACE)) 366 tracehook_report_syscall_exit(regs, stepping); 367 } 368 369 370 /* 371 * regset functions. 372 */ 373 374 static int fpr_get(struct task_struct *target, 375 const struct user_regset *regset, 376 unsigned int pos, unsigned int count, 377 void *kbuf, void __user *ubuf) 378 { 379 struct pt_regs *regs = task_regs(target); 380 __u64 *k = kbuf; 381 __u64 __user *u = ubuf; 382 __u64 reg; 383 384 pos /= sizeof(reg); 385 count /= sizeof(reg); 386 387 if (kbuf) 388 for (; count > 0 && pos < ELF_NFPREG; --count) 389 *k++ = regs->fr[pos++]; 390 else 391 for (; count > 0 && pos < ELF_NFPREG; --count) 392 if (__put_user(regs->fr[pos++], u++)) 393 return -EFAULT; 394 395 kbuf = k; 396 ubuf = u; 397 pos *= sizeof(reg); 398 count *= sizeof(reg); 399 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 400 ELF_NFPREG * sizeof(reg), -1); 401 } 402 403 static int fpr_set(struct task_struct *target, 404 const struct user_regset *regset, 405 unsigned int pos, unsigned int count, 406 const void *kbuf, const void __user *ubuf) 407 { 408 struct pt_regs *regs = task_regs(target); 409 const __u64 *k = kbuf; 410 const __u64 __user *u = ubuf; 411 __u64 reg; 412 413 pos /= sizeof(reg); 414 count /= sizeof(reg); 415 416 if (kbuf) 417 for (; count > 0 && pos < ELF_NFPREG; --count) 418 regs->fr[pos++] = *k++; 419 else 420 for (; count > 0 && pos < ELF_NFPREG; --count) { 421 if (__get_user(reg, u++)) 422 return -EFAULT; 423 regs->fr[pos++] = reg; 424 } 425 426 kbuf = k; 427 ubuf = u; 428 pos *= sizeof(reg); 429 count *= sizeof(reg); 430 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 431 ELF_NFPREG * sizeof(reg), -1); 432 } 433 434 #define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long)) 435 436 static unsigned long get_reg(struct pt_regs *regs, int num) 437 { 438 switch (num) { 439 case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])]; 440 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])]; 441 case RI(iasq[0]): return regs->iasq[0]; 442 case RI(iasq[1]): return regs->iasq[1]; 443 case RI(iaoq[0]): return regs->iaoq[0]; 444 case RI(iaoq[1]): return regs->iaoq[1]; 445 case RI(sar): return regs->sar; 446 case RI(iir): return regs->iir; 447 case RI(isr): return regs->isr; 448 case RI(ior): return regs->ior; 449 case RI(ipsw): return regs->ipsw; 450 case RI(cr27): return regs->cr27; 451 case RI(cr0): return mfctl(0); 452 case RI(cr24): return mfctl(24); 453 case RI(cr25): return mfctl(25); 454 case RI(cr26): return mfctl(26); 455 case RI(cr28): return mfctl(28); 456 case RI(cr29): return mfctl(29); 457 case RI(cr30): return mfctl(30); 458 case RI(cr31): return mfctl(31); 459 case RI(cr8): return mfctl(8); 460 case RI(cr9): return mfctl(9); 461 case RI(cr12): return mfctl(12); 462 case RI(cr13): return mfctl(13); 463 case RI(cr10): return mfctl(10); 464 case RI(cr15): return mfctl(15); 465 default: return 0; 466 } 467 } 468 469 static void set_reg(struct pt_regs *regs, int num, unsigned long val) 470 { 471 switch (num) { 472 case RI(gr[0]): /* 473 * PSW is in gr[0]. 474 * Allow writing to Nullify, Divide-step-correction, 475 * and carry/borrow bits. 476 * BEWARE, if you set N, and then single step, it won't 477 * stop on the nullified instruction. 478 */ 479 val &= USER_PSW_BITS; 480 regs->gr[0] &= ~USER_PSW_BITS; 481 regs->gr[0] |= val; 482 return; 483 case RI(gr[1]) ... RI(gr[31]): 484 regs->gr[num - RI(gr[0])] = val; 485 return; 486 case RI(iaoq[0]): 487 case RI(iaoq[1]): 488 regs->iaoq[num - RI(iaoq[0])] = val; 489 return; 490 case RI(sar): regs->sar = val; 491 return; 492 default: return; 493 #if 0 494 /* do not allow to change any of the following registers (yet) */ 495 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])]; 496 case RI(iasq[0]): return regs->iasq[0]; 497 case RI(iasq[1]): return regs->iasq[1]; 498 case RI(iir): return regs->iir; 499 case RI(isr): return regs->isr; 500 case RI(ior): return regs->ior; 501 case RI(ipsw): return regs->ipsw; 502 case RI(cr27): return regs->cr27; 503 case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31; 504 case cr8, cr9, cr12, cr13, cr10, cr15; 505 #endif 506 } 507 } 508 509 static int gpr_get(struct task_struct *target, 510 const struct user_regset *regset, 511 unsigned int pos, unsigned int count, 512 void *kbuf, void __user *ubuf) 513 { 514 struct pt_regs *regs = task_regs(target); 515 unsigned long *k = kbuf; 516 unsigned long __user *u = ubuf; 517 unsigned long reg; 518 519 pos /= sizeof(reg); 520 count /= sizeof(reg); 521 522 if (kbuf) 523 for (; count > 0 && pos < ELF_NGREG; --count) 524 *k++ = get_reg(regs, pos++); 525 else 526 for (; count > 0 && pos < ELF_NGREG; --count) 527 if (__put_user(get_reg(regs, pos++), u++)) 528 return -EFAULT; 529 kbuf = k; 530 ubuf = u; 531 pos *= sizeof(reg); 532 count *= sizeof(reg); 533 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 534 ELF_NGREG * sizeof(reg), -1); 535 } 536 537 static int gpr_set(struct task_struct *target, 538 const struct user_regset *regset, 539 unsigned int pos, unsigned int count, 540 const void *kbuf, const void __user *ubuf) 541 { 542 struct pt_regs *regs = task_regs(target); 543 const unsigned long *k = kbuf; 544 const unsigned long __user *u = ubuf; 545 unsigned long reg; 546 547 pos /= sizeof(reg); 548 count /= sizeof(reg); 549 550 if (kbuf) 551 for (; count > 0 && pos < ELF_NGREG; --count) 552 set_reg(regs, pos++, *k++); 553 else 554 for (; count > 0 && pos < ELF_NGREG; --count) { 555 if (__get_user(reg, u++)) 556 return -EFAULT; 557 set_reg(regs, pos++, reg); 558 } 559 560 kbuf = k; 561 ubuf = u; 562 pos *= sizeof(reg); 563 count *= sizeof(reg); 564 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 565 ELF_NGREG * sizeof(reg), -1); 566 } 567 568 static const struct user_regset native_regsets[] = { 569 [REGSET_GENERAL] = { 570 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 571 .size = sizeof(long), .align = sizeof(long), 572 .get = gpr_get, .set = gpr_set 573 }, 574 [REGSET_FP] = { 575 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 576 .size = sizeof(__u64), .align = sizeof(__u64), 577 .get = fpr_get, .set = fpr_set 578 } 579 }; 580 581 static const struct user_regset_view user_parisc_native_view = { 582 .name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX, 583 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) 584 }; 585 586 #ifdef CONFIG_64BIT 587 #include <linux/compat.h> 588 589 static int gpr32_get(struct task_struct *target, 590 const struct user_regset *regset, 591 unsigned int pos, unsigned int count, 592 void *kbuf, void __user *ubuf) 593 { 594 struct pt_regs *regs = task_regs(target); 595 compat_ulong_t *k = kbuf; 596 compat_ulong_t __user *u = ubuf; 597 compat_ulong_t reg; 598 599 pos /= sizeof(reg); 600 count /= sizeof(reg); 601 602 if (kbuf) 603 for (; count > 0 && pos < ELF_NGREG; --count) 604 *k++ = get_reg(regs, pos++); 605 else 606 for (; count > 0 && pos < ELF_NGREG; --count) 607 if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++)) 608 return -EFAULT; 609 610 kbuf = k; 611 ubuf = u; 612 pos *= sizeof(reg); 613 count *= sizeof(reg); 614 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 615 ELF_NGREG * sizeof(reg), -1); 616 } 617 618 static int gpr32_set(struct task_struct *target, 619 const struct user_regset *regset, 620 unsigned int pos, unsigned int count, 621 const void *kbuf, const void __user *ubuf) 622 { 623 struct pt_regs *regs = task_regs(target); 624 const compat_ulong_t *k = kbuf; 625 const compat_ulong_t __user *u = ubuf; 626 compat_ulong_t reg; 627 628 pos /= sizeof(reg); 629 count /= sizeof(reg); 630 631 if (kbuf) 632 for (; count > 0 && pos < ELF_NGREG; --count) 633 set_reg(regs, pos++, *k++); 634 else 635 for (; count > 0 && pos < ELF_NGREG; --count) { 636 if (__get_user(reg, u++)) 637 return -EFAULT; 638 set_reg(regs, pos++, reg); 639 } 640 641 kbuf = k; 642 ubuf = u; 643 pos *= sizeof(reg); 644 count *= sizeof(reg); 645 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 646 ELF_NGREG * sizeof(reg), -1); 647 } 648 649 /* 650 * These are the regset flavors matching the 32bit native set. 651 */ 652 static const struct user_regset compat_regsets[] = { 653 [REGSET_GENERAL] = { 654 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 655 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t), 656 .get = gpr32_get, .set = gpr32_set 657 }, 658 [REGSET_FP] = { 659 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 660 .size = sizeof(__u64), .align = sizeof(__u64), 661 .get = fpr_get, .set = fpr_set 662 } 663 }; 664 665 static const struct user_regset_view user_parisc_compat_view = { 666 .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX, 667 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) 668 }; 669 #endif /* CONFIG_64BIT */ 670 671 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 672 { 673 BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG); 674 BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG); 675 #ifdef CONFIG_64BIT 676 if (is_compat_task()) 677 return &user_parisc_compat_view; 678 #endif 679 return &user_parisc_native_view; 680 } 681