1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Kernel support for the ptrace() and syscall tracing interfaces. 4 * 5 * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc. 6 * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx> 7 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org> 8 * Copyright (C) 2008-2016 Helge Deller <deller@gmx.de> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/sched.h> 13 #include <linux/mm.h> 14 #include <linux/smp.h> 15 #include <linux/elf.h> 16 #include <linux/errno.h> 17 #include <linux/ptrace.h> 18 #include <linux/tracehook.h> 19 #include <linux/user.h> 20 #include <linux/personality.h> 21 #include <linux/regset.h> 22 #include <linux/security.h> 23 #include <linux/seccomp.h> 24 #include <linux/compat.h> 25 #include <linux/signal.h> 26 #include <linux/audit.h> 27 28 #include <linux/uaccess.h> 29 #include <asm/pgtable.h> 30 #include <asm/processor.h> 31 #include <asm/asm-offsets.h> 32 33 /* PSW bits we allow the debugger to modify */ 34 #define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB) 35 36 #define CREATE_TRACE_POINTS 37 #include <trace/events/syscalls.h> 38 39 /* 40 * These are our native regset flavors. 41 */ 42 enum parisc_regset { 43 REGSET_GENERAL, 44 REGSET_FP 45 }; 46 47 /* 48 * Called by kernel/ptrace.c when detaching.. 49 * 50 * Make sure single step bits etc are not set. 51 */ 52 void ptrace_disable(struct task_struct *task) 53 { 54 clear_tsk_thread_flag(task, TIF_SINGLESTEP); 55 clear_tsk_thread_flag(task, TIF_BLOCKSTEP); 56 57 /* make sure the trap bits are not set */ 58 pa_psw(task)->r = 0; 59 pa_psw(task)->t = 0; 60 pa_psw(task)->h = 0; 61 pa_psw(task)->l = 0; 62 } 63 64 /* 65 * The following functions are called by ptrace_resume() when 66 * enabling or disabling single/block tracing. 67 */ 68 void user_disable_single_step(struct task_struct *task) 69 { 70 ptrace_disable(task); 71 } 72 73 void user_enable_single_step(struct task_struct *task) 74 { 75 clear_tsk_thread_flag(task, TIF_BLOCKSTEP); 76 set_tsk_thread_flag(task, TIF_SINGLESTEP); 77 78 if (pa_psw(task)->n) { 79 /* Nullified, just crank over the queue. */ 80 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1]; 81 task_regs(task)->iasq[0] = task_regs(task)->iasq[1]; 82 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4; 83 pa_psw(task)->n = 0; 84 pa_psw(task)->x = 0; 85 pa_psw(task)->y = 0; 86 pa_psw(task)->z = 0; 87 pa_psw(task)->b = 0; 88 ptrace_disable(task); 89 /* Don't wake up the task, but let the 90 parent know something happened. */ 91 force_sig_fault(SIGTRAP, TRAP_TRACE, 92 (void __user *) (task_regs(task)->iaoq[0] & ~3), 93 task); 94 /* notify_parent(task, SIGCHLD); */ 95 return; 96 } 97 98 /* Enable recovery counter traps. The recovery counter 99 * itself will be set to zero on a task switch. If the 100 * task is suspended on a syscall then the syscall return 101 * path will overwrite the recovery counter with a suitable 102 * value such that it traps once back in user space. We 103 * disable interrupts in the tasks PSW here also, to avoid 104 * interrupts while the recovery counter is decrementing. 105 */ 106 pa_psw(task)->r = 1; 107 pa_psw(task)->t = 0; 108 pa_psw(task)->h = 0; 109 pa_psw(task)->l = 0; 110 } 111 112 void user_enable_block_step(struct task_struct *task) 113 { 114 clear_tsk_thread_flag(task, TIF_SINGLESTEP); 115 set_tsk_thread_flag(task, TIF_BLOCKSTEP); 116 117 /* Enable taken branch trap. */ 118 pa_psw(task)->r = 0; 119 pa_psw(task)->t = 1; 120 pa_psw(task)->h = 0; 121 pa_psw(task)->l = 0; 122 } 123 124 long arch_ptrace(struct task_struct *child, long request, 125 unsigned long addr, unsigned long data) 126 { 127 unsigned long __user *datap = (unsigned long __user *)data; 128 unsigned long tmp; 129 long ret = -EIO; 130 131 switch (request) { 132 133 /* Read the word at location addr in the USER area. For ptraced 134 processes, the kernel saves all regs on a syscall. */ 135 case PTRACE_PEEKUSR: 136 if ((addr & (sizeof(unsigned long)-1)) || 137 addr >= sizeof(struct pt_regs)) 138 break; 139 tmp = *(unsigned long *) ((char *) task_regs(child) + addr); 140 ret = put_user(tmp, datap); 141 break; 142 143 /* Write the word at location addr in the USER area. This will need 144 to change when the kernel no longer saves all regs on a syscall. 145 FIXME. There is a problem at the moment in that r3-r18 are only 146 saved if the process is ptraced on syscall entry, and even then 147 those values are overwritten by actual register values on syscall 148 exit. */ 149 case PTRACE_POKEUSR: 150 /* Some register values written here may be ignored in 151 * entry.S:syscall_restore_rfi; e.g. iaoq is written with 152 * r31/r31+4, and not with the values in pt_regs. 153 */ 154 if (addr == PT_PSW) { 155 /* Allow writing to Nullify, Divide-step-correction, 156 * and carry/borrow bits. 157 * BEWARE, if you set N, and then single step, it won't 158 * stop on the nullified instruction. 159 */ 160 data &= USER_PSW_BITS; 161 task_regs(child)->gr[0] &= ~USER_PSW_BITS; 162 task_regs(child)->gr[0] |= data; 163 ret = 0; 164 break; 165 } 166 167 if ((addr & (sizeof(unsigned long)-1)) || 168 addr >= sizeof(struct pt_regs)) 169 break; 170 if ((addr >= PT_GR1 && addr <= PT_GR31) || 171 addr == PT_IAOQ0 || addr == PT_IAOQ1 || 172 (addr >= PT_FR0 && addr <= PT_FR31 + 4) || 173 addr == PT_SAR) { 174 *(unsigned long *) ((char *) task_regs(child) + addr) = data; 175 ret = 0; 176 } 177 break; 178 179 case PTRACE_GETREGS: /* Get all gp regs from the child. */ 180 return copy_regset_to_user(child, 181 task_user_regset_view(current), 182 REGSET_GENERAL, 183 0, sizeof(struct user_regs_struct), 184 datap); 185 186 case PTRACE_SETREGS: /* Set all gp regs in the child. */ 187 return copy_regset_from_user(child, 188 task_user_regset_view(current), 189 REGSET_GENERAL, 190 0, sizeof(struct user_regs_struct), 191 datap); 192 193 case PTRACE_GETFPREGS: /* Get the child FPU state. */ 194 return copy_regset_to_user(child, 195 task_user_regset_view(current), 196 REGSET_FP, 197 0, sizeof(struct user_fp_struct), 198 datap); 199 200 case PTRACE_SETFPREGS: /* Set the child FPU state. */ 201 return copy_regset_from_user(child, 202 task_user_regset_view(current), 203 REGSET_FP, 204 0, sizeof(struct user_fp_struct), 205 datap); 206 207 default: 208 ret = ptrace_request(child, request, addr, data); 209 break; 210 } 211 212 return ret; 213 } 214 215 216 #ifdef CONFIG_COMPAT 217 218 /* This function is needed to translate 32 bit pt_regs offsets in to 219 * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel 220 * will request offset 12 if it wants gr3, but the lower 32 bits of 221 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4). 222 * This code relies on a 32 bit pt_regs being comprised of 32 bit values 223 * except for the fp registers which (a) are 64 bits, and (b) follow 224 * the gr registers at the start of pt_regs. The 32 bit pt_regs should 225 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[] 226 * being 64 bit in both cases. 227 */ 228 229 static compat_ulong_t translate_usr_offset(compat_ulong_t offset) 230 { 231 if (offset < 0) 232 return sizeof(struct pt_regs); 233 else if (offset <= 32*4) /* gr[0..31] */ 234 return offset * 2 + 4; 235 else if (offset <= 32*4+32*8) /* gr[0..31] + fr[0..31] */ 236 return offset + 32*4; 237 else if (offset < sizeof(struct pt_regs)/2 + 32*4) 238 return offset * 2 + 4 - 32*8; 239 else 240 return sizeof(struct pt_regs); 241 } 242 243 long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 244 compat_ulong_t addr, compat_ulong_t data) 245 { 246 compat_uint_t tmp; 247 long ret = -EIO; 248 249 switch (request) { 250 251 case PTRACE_PEEKUSR: 252 if (addr & (sizeof(compat_uint_t)-1)) 253 break; 254 addr = translate_usr_offset(addr); 255 if (addr >= sizeof(struct pt_regs)) 256 break; 257 258 tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr); 259 ret = put_user(tmp, (compat_uint_t *) (unsigned long) data); 260 break; 261 262 /* Write the word at location addr in the USER area. This will need 263 to change when the kernel no longer saves all regs on a syscall. 264 FIXME. There is a problem at the moment in that r3-r18 are only 265 saved if the process is ptraced on syscall entry, and even then 266 those values are overwritten by actual register values on syscall 267 exit. */ 268 case PTRACE_POKEUSR: 269 /* Some register values written here may be ignored in 270 * entry.S:syscall_restore_rfi; e.g. iaoq is written with 271 * r31/r31+4, and not with the values in pt_regs. 272 */ 273 if (addr == PT_PSW) { 274 /* Since PT_PSW==0, it is valid for 32 bit processes 275 * under 64 bit kernels as well. 276 */ 277 ret = arch_ptrace(child, request, addr, data); 278 } else { 279 if (addr & (sizeof(compat_uint_t)-1)) 280 break; 281 addr = translate_usr_offset(addr); 282 if (addr >= sizeof(struct pt_regs)) 283 break; 284 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) { 285 /* Special case, fp regs are 64 bits anyway */ 286 *(__u64 *) ((char *) task_regs(child) + addr) = data; 287 ret = 0; 288 } 289 else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) || 290 addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 || 291 addr == PT_SAR+4) { 292 /* Zero the top 32 bits */ 293 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0; 294 *(__u32 *) ((char *) task_regs(child) + addr) = data; 295 ret = 0; 296 } 297 } 298 break; 299 300 default: 301 ret = compat_ptrace_request(child, request, addr, data); 302 break; 303 } 304 305 return ret; 306 } 307 #endif 308 309 long do_syscall_trace_enter(struct pt_regs *regs) 310 { 311 if (test_thread_flag(TIF_SYSCALL_TRACE)) { 312 int rc = tracehook_report_syscall_entry(regs); 313 314 /* 315 * As tracesys_next does not set %r28 to -ENOSYS 316 * when %r20 is set to -1, initialize it here. 317 */ 318 regs->gr[28] = -ENOSYS; 319 320 if (rc) { 321 /* 322 * A nonzero return code from 323 * tracehook_report_syscall_entry() tells us 324 * to prevent the syscall execution. Skip 325 * the syscall call and the syscall restart handling. 326 * 327 * Note that the tracer may also just change 328 * regs->gr[20] to an invalid syscall number, 329 * that is handled by tracesys_next. 330 */ 331 regs->gr[20] = -1UL; 332 return -1; 333 } 334 } 335 336 /* Do the secure computing check after ptrace. */ 337 if (secure_computing(NULL) == -1) 338 return -1; 339 340 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS 341 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) 342 trace_sys_enter(regs, regs->gr[20]); 343 #endif 344 345 #ifdef CONFIG_64BIT 346 if (!is_compat_task()) 347 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25], 348 regs->gr[24], regs->gr[23]); 349 else 350 #endif 351 audit_syscall_entry(regs->gr[20] & 0xffffffff, 352 regs->gr[26] & 0xffffffff, 353 regs->gr[25] & 0xffffffff, 354 regs->gr[24] & 0xffffffff, 355 regs->gr[23] & 0xffffffff); 356 357 /* 358 * Sign extend the syscall number to 64bit since it may have been 359 * modified by a compat ptrace call 360 */ 361 return (int) ((u32) regs->gr[20]); 362 } 363 364 void do_syscall_trace_exit(struct pt_regs *regs) 365 { 366 int stepping = test_thread_flag(TIF_SINGLESTEP) || 367 test_thread_flag(TIF_BLOCKSTEP); 368 369 audit_syscall_exit(regs); 370 371 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS 372 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) 373 trace_sys_exit(regs, regs->gr[20]); 374 #endif 375 376 if (stepping || test_thread_flag(TIF_SYSCALL_TRACE)) 377 tracehook_report_syscall_exit(regs, stepping); 378 } 379 380 381 /* 382 * regset functions. 383 */ 384 385 static int fpr_get(struct task_struct *target, 386 const struct user_regset *regset, 387 unsigned int pos, unsigned int count, 388 void *kbuf, void __user *ubuf) 389 { 390 struct pt_regs *regs = task_regs(target); 391 __u64 *k = kbuf; 392 __u64 __user *u = ubuf; 393 __u64 reg; 394 395 pos /= sizeof(reg); 396 count /= sizeof(reg); 397 398 if (kbuf) 399 for (; count > 0 && pos < ELF_NFPREG; --count) 400 *k++ = regs->fr[pos++]; 401 else 402 for (; count > 0 && pos < ELF_NFPREG; --count) 403 if (__put_user(regs->fr[pos++], u++)) 404 return -EFAULT; 405 406 kbuf = k; 407 ubuf = u; 408 pos *= sizeof(reg); 409 count *= sizeof(reg); 410 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 411 ELF_NFPREG * sizeof(reg), -1); 412 } 413 414 static int fpr_set(struct task_struct *target, 415 const struct user_regset *regset, 416 unsigned int pos, unsigned int count, 417 const void *kbuf, const void __user *ubuf) 418 { 419 struct pt_regs *regs = task_regs(target); 420 const __u64 *k = kbuf; 421 const __u64 __user *u = ubuf; 422 __u64 reg; 423 424 pos /= sizeof(reg); 425 count /= sizeof(reg); 426 427 if (kbuf) 428 for (; count > 0 && pos < ELF_NFPREG; --count) 429 regs->fr[pos++] = *k++; 430 else 431 for (; count > 0 && pos < ELF_NFPREG; --count) { 432 if (__get_user(reg, u++)) 433 return -EFAULT; 434 regs->fr[pos++] = reg; 435 } 436 437 kbuf = k; 438 ubuf = u; 439 pos *= sizeof(reg); 440 count *= sizeof(reg); 441 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 442 ELF_NFPREG * sizeof(reg), -1); 443 } 444 445 #define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long)) 446 447 static unsigned long get_reg(struct pt_regs *regs, int num) 448 { 449 switch (num) { 450 case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])]; 451 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])]; 452 case RI(iasq[0]): return regs->iasq[0]; 453 case RI(iasq[1]): return regs->iasq[1]; 454 case RI(iaoq[0]): return regs->iaoq[0]; 455 case RI(iaoq[1]): return regs->iaoq[1]; 456 case RI(sar): return regs->sar; 457 case RI(iir): return regs->iir; 458 case RI(isr): return regs->isr; 459 case RI(ior): return regs->ior; 460 case RI(ipsw): return regs->ipsw; 461 case RI(cr27): return regs->cr27; 462 case RI(cr0): return mfctl(0); 463 case RI(cr24): return mfctl(24); 464 case RI(cr25): return mfctl(25); 465 case RI(cr26): return mfctl(26); 466 case RI(cr28): return mfctl(28); 467 case RI(cr29): return mfctl(29); 468 case RI(cr30): return mfctl(30); 469 case RI(cr31): return mfctl(31); 470 case RI(cr8): return mfctl(8); 471 case RI(cr9): return mfctl(9); 472 case RI(cr12): return mfctl(12); 473 case RI(cr13): return mfctl(13); 474 case RI(cr10): return mfctl(10); 475 case RI(cr15): return mfctl(15); 476 default: return 0; 477 } 478 } 479 480 static void set_reg(struct pt_regs *regs, int num, unsigned long val) 481 { 482 switch (num) { 483 case RI(gr[0]): /* 484 * PSW is in gr[0]. 485 * Allow writing to Nullify, Divide-step-correction, 486 * and carry/borrow bits. 487 * BEWARE, if you set N, and then single step, it won't 488 * stop on the nullified instruction. 489 */ 490 val &= USER_PSW_BITS; 491 regs->gr[0] &= ~USER_PSW_BITS; 492 regs->gr[0] |= val; 493 return; 494 case RI(gr[1]) ... RI(gr[31]): 495 regs->gr[num - RI(gr[0])] = val; 496 return; 497 case RI(iaoq[0]): 498 case RI(iaoq[1]): 499 regs->iaoq[num - RI(iaoq[0])] = val; 500 return; 501 case RI(sar): regs->sar = val; 502 return; 503 default: return; 504 #if 0 505 /* do not allow to change any of the following registers (yet) */ 506 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])]; 507 case RI(iasq[0]): return regs->iasq[0]; 508 case RI(iasq[1]): return regs->iasq[1]; 509 case RI(iir): return regs->iir; 510 case RI(isr): return regs->isr; 511 case RI(ior): return regs->ior; 512 case RI(ipsw): return regs->ipsw; 513 case RI(cr27): return regs->cr27; 514 case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31; 515 case cr8, cr9, cr12, cr13, cr10, cr15; 516 #endif 517 } 518 } 519 520 static int gpr_get(struct task_struct *target, 521 const struct user_regset *regset, 522 unsigned int pos, unsigned int count, 523 void *kbuf, void __user *ubuf) 524 { 525 struct pt_regs *regs = task_regs(target); 526 unsigned long *k = kbuf; 527 unsigned long __user *u = ubuf; 528 unsigned long reg; 529 530 pos /= sizeof(reg); 531 count /= sizeof(reg); 532 533 if (kbuf) 534 for (; count > 0 && pos < ELF_NGREG; --count) 535 *k++ = get_reg(regs, pos++); 536 else 537 for (; count > 0 && pos < ELF_NGREG; --count) 538 if (__put_user(get_reg(regs, pos++), u++)) 539 return -EFAULT; 540 kbuf = k; 541 ubuf = u; 542 pos *= sizeof(reg); 543 count *= sizeof(reg); 544 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 545 ELF_NGREG * sizeof(reg), -1); 546 } 547 548 static int gpr_set(struct task_struct *target, 549 const struct user_regset *regset, 550 unsigned int pos, unsigned int count, 551 const void *kbuf, const void __user *ubuf) 552 { 553 struct pt_regs *regs = task_regs(target); 554 const unsigned long *k = kbuf; 555 const unsigned long __user *u = ubuf; 556 unsigned long reg; 557 558 pos /= sizeof(reg); 559 count /= sizeof(reg); 560 561 if (kbuf) 562 for (; count > 0 && pos < ELF_NGREG; --count) 563 set_reg(regs, pos++, *k++); 564 else 565 for (; count > 0 && pos < ELF_NGREG; --count) { 566 if (__get_user(reg, u++)) 567 return -EFAULT; 568 set_reg(regs, pos++, reg); 569 } 570 571 kbuf = k; 572 ubuf = u; 573 pos *= sizeof(reg); 574 count *= sizeof(reg); 575 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 576 ELF_NGREG * sizeof(reg), -1); 577 } 578 579 static const struct user_regset native_regsets[] = { 580 [REGSET_GENERAL] = { 581 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 582 .size = sizeof(long), .align = sizeof(long), 583 .get = gpr_get, .set = gpr_set 584 }, 585 [REGSET_FP] = { 586 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 587 .size = sizeof(__u64), .align = sizeof(__u64), 588 .get = fpr_get, .set = fpr_set 589 } 590 }; 591 592 static const struct user_regset_view user_parisc_native_view = { 593 .name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX, 594 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) 595 }; 596 597 #ifdef CONFIG_64BIT 598 #include <linux/compat.h> 599 600 static int gpr32_get(struct task_struct *target, 601 const struct user_regset *regset, 602 unsigned int pos, unsigned int count, 603 void *kbuf, void __user *ubuf) 604 { 605 struct pt_regs *regs = task_regs(target); 606 compat_ulong_t *k = kbuf; 607 compat_ulong_t __user *u = ubuf; 608 compat_ulong_t reg; 609 610 pos /= sizeof(reg); 611 count /= sizeof(reg); 612 613 if (kbuf) 614 for (; count > 0 && pos < ELF_NGREG; --count) 615 *k++ = get_reg(regs, pos++); 616 else 617 for (; count > 0 && pos < ELF_NGREG; --count) 618 if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++)) 619 return -EFAULT; 620 621 kbuf = k; 622 ubuf = u; 623 pos *= sizeof(reg); 624 count *= sizeof(reg); 625 return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 626 ELF_NGREG * sizeof(reg), -1); 627 } 628 629 static int gpr32_set(struct task_struct *target, 630 const struct user_regset *regset, 631 unsigned int pos, unsigned int count, 632 const void *kbuf, const void __user *ubuf) 633 { 634 struct pt_regs *regs = task_regs(target); 635 const compat_ulong_t *k = kbuf; 636 const compat_ulong_t __user *u = ubuf; 637 compat_ulong_t reg; 638 639 pos /= sizeof(reg); 640 count /= sizeof(reg); 641 642 if (kbuf) 643 for (; count > 0 && pos < ELF_NGREG; --count) 644 set_reg(regs, pos++, *k++); 645 else 646 for (; count > 0 && pos < ELF_NGREG; --count) { 647 if (__get_user(reg, u++)) 648 return -EFAULT; 649 set_reg(regs, pos++, reg); 650 } 651 652 kbuf = k; 653 ubuf = u; 654 pos *= sizeof(reg); 655 count *= sizeof(reg); 656 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 657 ELF_NGREG * sizeof(reg), -1); 658 } 659 660 /* 661 * These are the regset flavors matching the 32bit native set. 662 */ 663 static const struct user_regset compat_regsets[] = { 664 [REGSET_GENERAL] = { 665 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG, 666 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t), 667 .get = gpr32_get, .set = gpr32_set 668 }, 669 [REGSET_FP] = { 670 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG, 671 .size = sizeof(__u64), .align = sizeof(__u64), 672 .get = fpr_get, .set = fpr_set 673 } 674 }; 675 676 static const struct user_regset_view user_parisc_compat_view = { 677 .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX, 678 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) 679 }; 680 #endif /* CONFIG_64BIT */ 681 682 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 683 { 684 BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG); 685 BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG); 686 #ifdef CONFIG_64BIT 687 if (is_compat_task()) 688 return &user_parisc_compat_view; 689 #endif 690 return &user_parisc_native_view; 691 } 692 693 694 /* HAVE_REGS_AND_STACK_ACCESS_API feature */ 695 696 struct pt_regs_offset { 697 const char *name; 698 int offset; 699 }; 700 701 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} 702 #define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])} 703 #define REG_OFFSET_END {.name = NULL, .offset = 0} 704 705 static const struct pt_regs_offset regoffset_table[] = { 706 REG_OFFSET_INDEX(gr,0), 707 REG_OFFSET_INDEX(gr,1), 708 REG_OFFSET_INDEX(gr,2), 709 REG_OFFSET_INDEX(gr,3), 710 REG_OFFSET_INDEX(gr,4), 711 REG_OFFSET_INDEX(gr,5), 712 REG_OFFSET_INDEX(gr,6), 713 REG_OFFSET_INDEX(gr,7), 714 REG_OFFSET_INDEX(gr,8), 715 REG_OFFSET_INDEX(gr,9), 716 REG_OFFSET_INDEX(gr,10), 717 REG_OFFSET_INDEX(gr,11), 718 REG_OFFSET_INDEX(gr,12), 719 REG_OFFSET_INDEX(gr,13), 720 REG_OFFSET_INDEX(gr,14), 721 REG_OFFSET_INDEX(gr,15), 722 REG_OFFSET_INDEX(gr,16), 723 REG_OFFSET_INDEX(gr,17), 724 REG_OFFSET_INDEX(gr,18), 725 REG_OFFSET_INDEX(gr,19), 726 REG_OFFSET_INDEX(gr,20), 727 REG_OFFSET_INDEX(gr,21), 728 REG_OFFSET_INDEX(gr,22), 729 REG_OFFSET_INDEX(gr,23), 730 REG_OFFSET_INDEX(gr,24), 731 REG_OFFSET_INDEX(gr,25), 732 REG_OFFSET_INDEX(gr,26), 733 REG_OFFSET_INDEX(gr,27), 734 REG_OFFSET_INDEX(gr,28), 735 REG_OFFSET_INDEX(gr,29), 736 REG_OFFSET_INDEX(gr,30), 737 REG_OFFSET_INDEX(gr,31), 738 REG_OFFSET_INDEX(sr,0), 739 REG_OFFSET_INDEX(sr,1), 740 REG_OFFSET_INDEX(sr,2), 741 REG_OFFSET_INDEX(sr,3), 742 REG_OFFSET_INDEX(sr,4), 743 REG_OFFSET_INDEX(sr,5), 744 REG_OFFSET_INDEX(sr,6), 745 REG_OFFSET_INDEX(sr,7), 746 REG_OFFSET_INDEX(iasq,0), 747 REG_OFFSET_INDEX(iasq,1), 748 REG_OFFSET_INDEX(iaoq,0), 749 REG_OFFSET_INDEX(iaoq,1), 750 REG_OFFSET_NAME(cr27), 751 REG_OFFSET_NAME(ksp), 752 REG_OFFSET_NAME(kpc), 753 REG_OFFSET_NAME(sar), 754 REG_OFFSET_NAME(iir), 755 REG_OFFSET_NAME(isr), 756 REG_OFFSET_NAME(ior), 757 REG_OFFSET_NAME(ipsw), 758 REG_OFFSET_END, 759 }; 760 761 /** 762 * regs_query_register_offset() - query register offset from its name 763 * @name: the name of a register 764 * 765 * regs_query_register_offset() returns the offset of a register in struct 766 * pt_regs from its name. If the name is invalid, this returns -EINVAL; 767 */ 768 int regs_query_register_offset(const char *name) 769 { 770 const struct pt_regs_offset *roff; 771 for (roff = regoffset_table; roff->name != NULL; roff++) 772 if (!strcmp(roff->name, name)) 773 return roff->offset; 774 return -EINVAL; 775 } 776 777 /** 778 * regs_query_register_name() - query register name from its offset 779 * @offset: the offset of a register in struct pt_regs. 780 * 781 * regs_query_register_name() returns the name of a register from its 782 * offset in struct pt_regs. If the @offset is invalid, this returns NULL; 783 */ 784 const char *regs_query_register_name(unsigned int offset) 785 { 786 const struct pt_regs_offset *roff; 787 for (roff = regoffset_table; roff->name != NULL; roff++) 788 if (roff->offset == offset) 789 return roff->name; 790 return NULL; 791 } 792