1 /* 2 * arch/s390/kernel/ptrace.c 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Based on PowerPC version 10 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 11 * 12 * Derived from "arch/m68k/kernel/ptrace.c" 13 * Copyright (C) 1994 by Hamish Macdonald 14 * Taken from linux/kernel/ptrace.c and modified for M680x0. 15 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds 16 * 17 * Modified by Cort Dougan (cort@cs.nmt.edu) 18 * 19 * 20 * This file is subject to the terms and conditions of the GNU General 21 * Public License. See the file README.legal in the main directory of 22 * this archive for more details. 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/sched.h> 27 #include <linux/mm.h> 28 #include <linux/smp.h> 29 #include <linux/errno.h> 30 #include <linux/ptrace.h> 31 #include <linux/user.h> 32 #include <linux/security.h> 33 #include <linux/audit.h> 34 #include <linux/signal.h> 35 #include <linux/elf.h> 36 #include <linux/regset.h> 37 #include <linux/tracehook.h> 38 #include <linux/seccomp.h> 39 #include <trace/syscall.h> 40 #include <asm/compat.h> 41 #include <asm/segment.h> 42 #include <asm/page.h> 43 #include <asm/pgtable.h> 44 #include <asm/pgalloc.h> 45 #include <asm/system.h> 46 #include <asm/uaccess.h> 47 #include <asm/unistd.h> 48 #include "entry.h" 49 50 #ifdef CONFIG_COMPAT 51 #include "compat_ptrace.h" 52 #endif 53 54 enum s390_regset { 55 REGSET_GENERAL, 56 REGSET_FP, 57 }; 58 59 static void 60 FixPerRegisters(struct task_struct *task) 61 { 62 struct pt_regs *regs; 63 per_struct *per_info; 64 65 regs = task_pt_regs(task); 66 per_info = (per_struct *) &task->thread.per_info; 67 per_info->control_regs.bits.em_instruction_fetch = 68 per_info->single_step | per_info->instruction_fetch; 69 70 if (per_info->single_step) { 71 per_info->control_regs.bits.starting_addr = 0; 72 #ifdef CONFIG_COMPAT 73 if (is_compat_task()) 74 per_info->control_regs.bits.ending_addr = 0x7fffffffUL; 75 else 76 #endif 77 per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; 78 } else { 79 per_info->control_regs.bits.starting_addr = 80 per_info->starting_addr; 81 per_info->control_regs.bits.ending_addr = 82 per_info->ending_addr; 83 } 84 /* 85 * if any of the control reg tracing bits are on 86 * we switch on per in the psw 87 */ 88 if (per_info->control_regs.words.cr[0] & PER_EM_MASK) 89 regs->psw.mask |= PSW_MASK_PER; 90 else 91 regs->psw.mask &= ~PSW_MASK_PER; 92 93 if (per_info->control_regs.bits.em_storage_alteration) 94 per_info->control_regs.bits.storage_alt_space_ctl = 1; 95 else 96 per_info->control_regs.bits.storage_alt_space_ctl = 0; 97 } 98 99 void user_enable_single_step(struct task_struct *task) 100 { 101 task->thread.per_info.single_step = 1; 102 FixPerRegisters(task); 103 } 104 105 void user_disable_single_step(struct task_struct *task) 106 { 107 task->thread.per_info.single_step = 0; 108 FixPerRegisters(task); 109 } 110 111 /* 112 * Called by kernel/ptrace.c when detaching.. 113 * 114 * Make sure single step bits etc are not set. 115 */ 116 void 117 ptrace_disable(struct task_struct *child) 118 { 119 /* make sure the single step bit is not set. */ 120 user_disable_single_step(child); 121 } 122 123 #ifndef CONFIG_64BIT 124 # define __ADDR_MASK 3 125 #else 126 # define __ADDR_MASK 7 127 #endif 128 129 /* 130 * Read the word at offset addr from the user area of a process. The 131 * trouble here is that the information is littered over different 132 * locations. The process registers are found on the kernel stack, 133 * the floating point stuff and the trace settings are stored in 134 * the task structure. In addition the different structures in 135 * struct user contain pad bytes that should be read as zeroes. 136 * Lovely... 137 */ 138 static unsigned long __peek_user(struct task_struct *child, addr_t addr) 139 { 140 struct user *dummy = NULL; 141 addr_t offset, tmp; 142 143 if (addr < (addr_t) &dummy->regs.acrs) { 144 /* 145 * psw and gprs are stored on the stack 146 */ 147 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); 148 if (addr == (addr_t) &dummy->regs.psw.mask) 149 /* Remove per bit from user psw. */ 150 tmp &= ~PSW_MASK_PER; 151 152 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { 153 /* 154 * access registers are stored in the thread structure 155 */ 156 offset = addr - (addr_t) &dummy->regs.acrs; 157 #ifdef CONFIG_64BIT 158 /* 159 * Very special case: old & broken 64 bit gdb reading 160 * from acrs[15]. Result is a 64 bit value. Read the 161 * 32 bit acrs[15] value and shift it by 32. Sick... 162 */ 163 if (addr == (addr_t) &dummy->regs.acrs[15]) 164 tmp = ((unsigned long) child->thread.acrs[15]) << 32; 165 else 166 #endif 167 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); 168 169 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { 170 /* 171 * orig_gpr2 is stored on the kernel stack 172 */ 173 tmp = (addr_t) task_pt_regs(child)->orig_gpr2; 174 175 } else if (addr < (addr_t) &dummy->regs.fp_regs) { 176 /* 177 * prevent reads of padding hole between 178 * orig_gpr2 and fp_regs on s390. 179 */ 180 tmp = 0; 181 182 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { 183 /* 184 * floating point regs. are stored in the thread structure 185 */ 186 offset = addr - (addr_t) &dummy->regs.fp_regs; 187 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); 188 if (addr == (addr_t) &dummy->regs.fp_regs.fpc) 189 tmp &= (unsigned long) FPC_VALID_MASK 190 << (BITS_PER_LONG - 32); 191 192 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { 193 /* 194 * per_info is found in the thread structure 195 */ 196 offset = addr - (addr_t) &dummy->regs.per_info; 197 tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); 198 199 } else 200 tmp = 0; 201 202 return tmp; 203 } 204 205 static int 206 peek_user(struct task_struct *child, addr_t addr, addr_t data) 207 { 208 addr_t tmp, mask; 209 210 /* 211 * Stupid gdb peeks/pokes the access registers in 64 bit with 212 * an alignment of 4. Programmers from hell... 213 */ 214 mask = __ADDR_MASK; 215 #ifdef CONFIG_64BIT 216 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && 217 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) 218 mask = 3; 219 #endif 220 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) 221 return -EIO; 222 223 tmp = __peek_user(child, addr); 224 return put_user(tmp, (addr_t __user *) data); 225 } 226 227 /* 228 * Write a word to the user area of a process at location addr. This 229 * operation does have an additional problem compared to peek_user. 230 * Stores to the program status word and on the floating point 231 * control register needs to get checked for validity. 232 */ 233 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) 234 { 235 struct user *dummy = NULL; 236 addr_t offset; 237 238 if (addr < (addr_t) &dummy->regs.acrs) { 239 /* 240 * psw and gprs are stored on the stack 241 */ 242 if (addr == (addr_t) &dummy->regs.psw.mask && 243 #ifdef CONFIG_COMPAT 244 data != PSW_MASK_MERGE(psw_user32_bits, data) && 245 #endif 246 data != PSW_MASK_MERGE(psw_user_bits, data)) 247 /* Invalid psw mask. */ 248 return -EINVAL; 249 #ifndef CONFIG_64BIT 250 if (addr == (addr_t) &dummy->regs.psw.addr) 251 /* I'd like to reject addresses without the 252 high order bit but older gdb's rely on it */ 253 data |= PSW_ADDR_AMODE; 254 #endif 255 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; 256 257 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { 258 /* 259 * access registers are stored in the thread structure 260 */ 261 offset = addr - (addr_t) &dummy->regs.acrs; 262 #ifdef CONFIG_64BIT 263 /* 264 * Very special case: old & broken 64 bit gdb writing 265 * to acrs[15] with a 64 bit value. Ignore the lower 266 * half of the value and write the upper 32 bit to 267 * acrs[15]. Sick... 268 */ 269 if (addr == (addr_t) &dummy->regs.acrs[15]) 270 child->thread.acrs[15] = (unsigned int) (data >> 32); 271 else 272 #endif 273 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; 274 275 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { 276 /* 277 * orig_gpr2 is stored on the kernel stack 278 */ 279 task_pt_regs(child)->orig_gpr2 = data; 280 281 } else if (addr < (addr_t) &dummy->regs.fp_regs) { 282 /* 283 * prevent writes of padding hole between 284 * orig_gpr2 and fp_regs on s390. 285 */ 286 return 0; 287 288 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { 289 /* 290 * floating point regs. are stored in the thread structure 291 */ 292 if (addr == (addr_t) &dummy->regs.fp_regs.fpc && 293 (data & ~((unsigned long) FPC_VALID_MASK 294 << (BITS_PER_LONG - 32))) != 0) 295 return -EINVAL; 296 offset = addr - (addr_t) &dummy->regs.fp_regs; 297 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; 298 299 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { 300 /* 301 * per_info is found in the thread structure 302 */ 303 offset = addr - (addr_t) &dummy->regs.per_info; 304 *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; 305 306 } 307 308 FixPerRegisters(child); 309 return 0; 310 } 311 312 static int 313 poke_user(struct task_struct *child, addr_t addr, addr_t data) 314 { 315 addr_t mask; 316 317 /* 318 * Stupid gdb peeks/pokes the access registers in 64 bit with 319 * an alignment of 4. Programmers from hell indeed... 320 */ 321 mask = __ADDR_MASK; 322 #ifdef CONFIG_64BIT 323 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && 324 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) 325 mask = 3; 326 #endif 327 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) 328 return -EIO; 329 330 return __poke_user(child, addr, data); 331 } 332 333 long arch_ptrace(struct task_struct *child, long request, long addr, long data) 334 { 335 ptrace_area parea; 336 int copied, ret; 337 338 switch (request) { 339 case PTRACE_PEEKTEXT: 340 case PTRACE_PEEKDATA: 341 /* Remove high order bit from address (only for 31 bit). */ 342 addr &= PSW_ADDR_INSN; 343 /* read word at location addr. */ 344 return generic_ptrace_peekdata(child, addr, data); 345 346 case PTRACE_PEEKUSR: 347 /* read the word at location addr in the USER area. */ 348 return peek_user(child, addr, data); 349 350 case PTRACE_POKETEXT: 351 case PTRACE_POKEDATA: 352 /* Remove high order bit from address (only for 31 bit). */ 353 addr &= PSW_ADDR_INSN; 354 /* write the word at location addr. */ 355 return generic_ptrace_pokedata(child, addr, data); 356 357 case PTRACE_POKEUSR: 358 /* write the word at location addr in the USER area */ 359 return poke_user(child, addr, data); 360 361 case PTRACE_PEEKUSR_AREA: 362 case PTRACE_POKEUSR_AREA: 363 if (copy_from_user(&parea, (void __force __user *) addr, 364 sizeof(parea))) 365 return -EFAULT; 366 addr = parea.kernel_addr; 367 data = parea.process_addr; 368 copied = 0; 369 while (copied < parea.len) { 370 if (request == PTRACE_PEEKUSR_AREA) 371 ret = peek_user(child, addr, data); 372 else { 373 addr_t utmp; 374 if (get_user(utmp, 375 (addr_t __force __user *) data)) 376 return -EFAULT; 377 ret = poke_user(child, addr, utmp); 378 } 379 if (ret) 380 return ret; 381 addr += sizeof(unsigned long); 382 data += sizeof(unsigned long); 383 copied += sizeof(unsigned long); 384 } 385 return 0; 386 } 387 return ptrace_request(child, request, addr, data); 388 } 389 390 #ifdef CONFIG_COMPAT 391 /* 392 * Now the fun part starts... a 31 bit program running in the 393 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, 394 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy 395 * to handle, the difference to the 64 bit versions of the requests 396 * is that the access is done in multiples of 4 byte instead of 397 * 8 bytes (sizeof(unsigned long) on 31/64 bit). 398 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, 399 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program 400 * is a 31 bit program too, the content of struct user can be 401 * emulated. A 31 bit program peeking into the struct user of 402 * a 64 bit program is a no-no. 403 */ 404 405 /* 406 * Same as peek_user but for a 31 bit program. 407 */ 408 static u32 __peek_user_compat(struct task_struct *child, addr_t addr) 409 { 410 struct user32 *dummy32 = NULL; 411 per_struct32 *dummy_per32 = NULL; 412 addr_t offset; 413 __u32 tmp; 414 415 if (addr < (addr_t) &dummy32->regs.acrs) { 416 /* 417 * psw and gprs are stored on the stack 418 */ 419 if (addr == (addr_t) &dummy32->regs.psw.mask) { 420 /* Fake a 31 bit psw mask. */ 421 tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); 422 tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); 423 } else if (addr == (addr_t) &dummy32->regs.psw.addr) { 424 /* Fake a 31 bit psw address. */ 425 tmp = (__u32) task_pt_regs(child)->psw.addr | 426 PSW32_ADDR_AMODE31; 427 } else { 428 /* gpr 0-15 */ 429 tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw + 430 addr*2 + 4); 431 } 432 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { 433 /* 434 * access registers are stored in the thread structure 435 */ 436 offset = addr - (addr_t) &dummy32->regs.acrs; 437 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); 438 439 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { 440 /* 441 * orig_gpr2 is stored on the kernel stack 442 */ 443 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); 444 445 } else if (addr < (addr_t) &dummy32->regs.fp_regs) { 446 /* 447 * prevent reads of padding hole between 448 * orig_gpr2 and fp_regs on s390. 449 */ 450 tmp = 0; 451 452 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { 453 /* 454 * floating point regs. are stored in the thread structure 455 */ 456 offset = addr - (addr_t) &dummy32->regs.fp_regs; 457 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); 458 459 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { 460 /* 461 * per_info is found in the thread structure 462 */ 463 offset = addr - (addr_t) &dummy32->regs.per_info; 464 /* This is magic. See per_struct and per_struct32. */ 465 if ((offset >= (addr_t) &dummy_per32->control_regs && 466 offset < (addr_t) (&dummy_per32->control_regs + 1)) || 467 (offset >= (addr_t) &dummy_per32->starting_addr && 468 offset <= (addr_t) &dummy_per32->ending_addr) || 469 offset == (addr_t) &dummy_per32->lowcore.words.address) 470 offset = offset*2 + 4; 471 else 472 offset = offset*2; 473 tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); 474 475 } else 476 tmp = 0; 477 478 return tmp; 479 } 480 481 static int peek_user_compat(struct task_struct *child, 482 addr_t addr, addr_t data) 483 { 484 __u32 tmp; 485 486 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) 487 return -EIO; 488 489 tmp = __peek_user_compat(child, addr); 490 return put_user(tmp, (__u32 __user *) data); 491 } 492 493 /* 494 * Same as poke_user but for a 31 bit program. 495 */ 496 static int __poke_user_compat(struct task_struct *child, 497 addr_t addr, addr_t data) 498 { 499 struct user32 *dummy32 = NULL; 500 per_struct32 *dummy_per32 = NULL; 501 __u32 tmp = (__u32) data; 502 addr_t offset; 503 504 if (addr < (addr_t) &dummy32->regs.acrs) { 505 /* 506 * psw, gprs, acrs and orig_gpr2 are stored on the stack 507 */ 508 if (addr == (addr_t) &dummy32->regs.psw.mask) { 509 /* Build a 64 bit psw mask from 31 bit mask. */ 510 if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp)) 511 /* Invalid psw mask. */ 512 return -EINVAL; 513 task_pt_regs(child)->psw.mask = 514 PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); 515 } else if (addr == (addr_t) &dummy32->regs.psw.addr) { 516 /* Build a 64 bit psw address from 31 bit address. */ 517 task_pt_regs(child)->psw.addr = 518 (__u64) tmp & PSW32_ADDR_INSN; 519 } else { 520 /* gpr 0-15 */ 521 *(__u32*)((addr_t) &task_pt_regs(child)->psw 522 + addr*2 + 4) = tmp; 523 } 524 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { 525 /* 526 * access registers are stored in the thread structure 527 */ 528 offset = addr - (addr_t) &dummy32->regs.acrs; 529 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; 530 531 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { 532 /* 533 * orig_gpr2 is stored on the kernel stack 534 */ 535 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; 536 537 } else if (addr < (addr_t) &dummy32->regs.fp_regs) { 538 /* 539 * prevent writess of padding hole between 540 * orig_gpr2 and fp_regs on s390. 541 */ 542 return 0; 543 544 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { 545 /* 546 * floating point regs. are stored in the thread structure 547 */ 548 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && 549 (tmp & ~FPC_VALID_MASK) != 0) 550 /* Invalid floating point control. */ 551 return -EINVAL; 552 offset = addr - (addr_t) &dummy32->regs.fp_regs; 553 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; 554 555 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { 556 /* 557 * per_info is found in the thread structure. 558 */ 559 offset = addr - (addr_t) &dummy32->regs.per_info; 560 /* 561 * This is magic. See per_struct and per_struct32. 562 * By incident the offsets in per_struct are exactly 563 * twice the offsets in per_struct32 for all fields. 564 * The 8 byte fields need special handling though, 565 * because the second half (bytes 4-7) is needed and 566 * not the first half. 567 */ 568 if ((offset >= (addr_t) &dummy_per32->control_regs && 569 offset < (addr_t) (&dummy_per32->control_regs + 1)) || 570 (offset >= (addr_t) &dummy_per32->starting_addr && 571 offset <= (addr_t) &dummy_per32->ending_addr) || 572 offset == (addr_t) &dummy_per32->lowcore.words.address) 573 offset = offset*2 + 4; 574 else 575 offset = offset*2; 576 *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; 577 578 } 579 580 FixPerRegisters(child); 581 return 0; 582 } 583 584 static int poke_user_compat(struct task_struct *child, 585 addr_t addr, addr_t data) 586 { 587 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3) 588 return -EIO; 589 590 return __poke_user_compat(child, addr, data); 591 } 592 593 long compat_arch_ptrace(struct task_struct *child, compat_long_t request, 594 compat_ulong_t caddr, compat_ulong_t cdata) 595 { 596 unsigned long addr = caddr; 597 unsigned long data = cdata; 598 ptrace_area_emu31 parea; 599 int copied, ret; 600 601 switch (request) { 602 case PTRACE_PEEKUSR: 603 /* read the word at location addr in the USER area. */ 604 return peek_user_compat(child, addr, data); 605 606 case PTRACE_POKEUSR: 607 /* write the word at location addr in the USER area */ 608 return poke_user_compat(child, addr, data); 609 610 case PTRACE_PEEKUSR_AREA: 611 case PTRACE_POKEUSR_AREA: 612 if (copy_from_user(&parea, (void __force __user *) addr, 613 sizeof(parea))) 614 return -EFAULT; 615 addr = parea.kernel_addr; 616 data = parea.process_addr; 617 copied = 0; 618 while (copied < parea.len) { 619 if (request == PTRACE_PEEKUSR_AREA) 620 ret = peek_user_compat(child, addr, data); 621 else { 622 __u32 utmp; 623 if (get_user(utmp, 624 (__u32 __force __user *) data)) 625 return -EFAULT; 626 ret = poke_user_compat(child, addr, utmp); 627 } 628 if (ret) 629 return ret; 630 addr += sizeof(unsigned int); 631 data += sizeof(unsigned int); 632 copied += sizeof(unsigned int); 633 } 634 return 0; 635 } 636 return compat_ptrace_request(child, request, addr, data); 637 } 638 #endif 639 640 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) 641 { 642 long ret; 643 644 /* Do the secure computing check first. */ 645 secure_computing(regs->gprs[2]); 646 647 /* 648 * The sysc_tracesys code in entry.S stored the system 649 * call number to gprs[2]. 650 */ 651 ret = regs->gprs[2]; 652 if (test_thread_flag(TIF_SYSCALL_TRACE) && 653 (tracehook_report_syscall_entry(regs) || 654 regs->gprs[2] >= NR_syscalls)) { 655 /* 656 * Tracing decided this syscall should not happen or the 657 * debugger stored an invalid system call number. Skip 658 * the system call and the system call restart handling. 659 */ 660 regs->svcnr = 0; 661 ret = -1; 662 } 663 664 if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) 665 ftrace_syscall_enter(regs); 666 667 if (unlikely(current->audit_context)) 668 audit_syscall_entry(is_compat_task() ? 669 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, 670 regs->gprs[2], regs->orig_gpr2, 671 regs->gprs[3], regs->gprs[4], 672 regs->gprs[5]); 673 return ret; 674 } 675 676 asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) 677 { 678 if (unlikely(current->audit_context)) 679 audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), 680 regs->gprs[2]); 681 682 if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) 683 ftrace_syscall_exit(regs); 684 685 if (test_thread_flag(TIF_SYSCALL_TRACE)) 686 tracehook_report_syscall_exit(regs, 0); 687 } 688 689 /* 690 * user_regset definitions. 691 */ 692 693 static int s390_regs_get(struct task_struct *target, 694 const struct user_regset *regset, 695 unsigned int pos, unsigned int count, 696 void *kbuf, void __user *ubuf) 697 { 698 if (target == current) 699 save_access_regs(target->thread.acrs); 700 701 if (kbuf) { 702 unsigned long *k = kbuf; 703 while (count > 0) { 704 *k++ = __peek_user(target, pos); 705 count -= sizeof(*k); 706 pos += sizeof(*k); 707 } 708 } else { 709 unsigned long __user *u = ubuf; 710 while (count > 0) { 711 if (__put_user(__peek_user(target, pos), u++)) 712 return -EFAULT; 713 count -= sizeof(*u); 714 pos += sizeof(*u); 715 } 716 } 717 return 0; 718 } 719 720 static int s390_regs_set(struct task_struct *target, 721 const struct user_regset *regset, 722 unsigned int pos, unsigned int count, 723 const void *kbuf, const void __user *ubuf) 724 { 725 int rc = 0; 726 727 if (target == current) 728 save_access_regs(target->thread.acrs); 729 730 if (kbuf) { 731 const unsigned long *k = kbuf; 732 while (count > 0 && !rc) { 733 rc = __poke_user(target, pos, *k++); 734 count -= sizeof(*k); 735 pos += sizeof(*k); 736 } 737 } else { 738 const unsigned long __user *u = ubuf; 739 while (count > 0 && !rc) { 740 unsigned long word; 741 rc = __get_user(word, u++); 742 if (rc) 743 break; 744 rc = __poke_user(target, pos, word); 745 count -= sizeof(*u); 746 pos += sizeof(*u); 747 } 748 } 749 750 if (rc == 0 && target == current) 751 restore_access_regs(target->thread.acrs); 752 753 return rc; 754 } 755 756 static int s390_fpregs_get(struct task_struct *target, 757 const struct user_regset *regset, unsigned int pos, 758 unsigned int count, void *kbuf, void __user *ubuf) 759 { 760 if (target == current) 761 save_fp_regs(&target->thread.fp_regs); 762 763 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, 764 &target->thread.fp_regs, 0, -1); 765 } 766 767 static int s390_fpregs_set(struct task_struct *target, 768 const struct user_regset *regset, unsigned int pos, 769 unsigned int count, const void *kbuf, 770 const void __user *ubuf) 771 { 772 int rc = 0; 773 774 if (target == current) 775 save_fp_regs(&target->thread.fp_regs); 776 777 /* If setting FPC, must validate it first. */ 778 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { 779 u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; 780 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, 781 0, offsetof(s390_fp_regs, fprs)); 782 if (rc) 783 return rc; 784 if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) 785 return -EINVAL; 786 target->thread.fp_regs.fpc = fpc[0]; 787 } 788 789 if (rc == 0 && count > 0) 790 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, 791 target->thread.fp_regs.fprs, 792 offsetof(s390_fp_regs, fprs), -1); 793 794 if (rc == 0 && target == current) 795 restore_fp_regs(&target->thread.fp_regs); 796 797 return rc; 798 } 799 800 static const struct user_regset s390_regsets[] = { 801 [REGSET_GENERAL] = { 802 .core_note_type = NT_PRSTATUS, 803 .n = sizeof(s390_regs) / sizeof(long), 804 .size = sizeof(long), 805 .align = sizeof(long), 806 .get = s390_regs_get, 807 .set = s390_regs_set, 808 }, 809 [REGSET_FP] = { 810 .core_note_type = NT_PRFPREG, 811 .n = sizeof(s390_fp_regs) / sizeof(long), 812 .size = sizeof(long), 813 .align = sizeof(long), 814 .get = s390_fpregs_get, 815 .set = s390_fpregs_set, 816 }, 817 }; 818 819 static const struct user_regset_view user_s390_view = { 820 .name = UTS_MACHINE, 821 .e_machine = EM_S390, 822 .regsets = s390_regsets, 823 .n = ARRAY_SIZE(s390_regsets) 824 }; 825 826 #ifdef CONFIG_COMPAT 827 static int s390_compat_regs_get(struct task_struct *target, 828 const struct user_regset *regset, 829 unsigned int pos, unsigned int count, 830 void *kbuf, void __user *ubuf) 831 { 832 if (target == current) 833 save_access_regs(target->thread.acrs); 834 835 if (kbuf) { 836 compat_ulong_t *k = kbuf; 837 while (count > 0) { 838 *k++ = __peek_user_compat(target, pos); 839 count -= sizeof(*k); 840 pos += sizeof(*k); 841 } 842 } else { 843 compat_ulong_t __user *u = ubuf; 844 while (count > 0) { 845 if (__put_user(__peek_user_compat(target, pos), u++)) 846 return -EFAULT; 847 count -= sizeof(*u); 848 pos += sizeof(*u); 849 } 850 } 851 return 0; 852 } 853 854 static int s390_compat_regs_set(struct task_struct *target, 855 const struct user_regset *regset, 856 unsigned int pos, unsigned int count, 857 const void *kbuf, const void __user *ubuf) 858 { 859 int rc = 0; 860 861 if (target == current) 862 save_access_regs(target->thread.acrs); 863 864 if (kbuf) { 865 const compat_ulong_t *k = kbuf; 866 while (count > 0 && !rc) { 867 rc = __poke_user_compat(target, pos, *k++); 868 count -= sizeof(*k); 869 pos += sizeof(*k); 870 } 871 } else { 872 const compat_ulong_t __user *u = ubuf; 873 while (count > 0 && !rc) { 874 compat_ulong_t word; 875 rc = __get_user(word, u++); 876 if (rc) 877 break; 878 rc = __poke_user_compat(target, pos, word); 879 count -= sizeof(*u); 880 pos += sizeof(*u); 881 } 882 } 883 884 if (rc == 0 && target == current) 885 restore_access_regs(target->thread.acrs); 886 887 return rc; 888 } 889 890 static const struct user_regset s390_compat_regsets[] = { 891 [REGSET_GENERAL] = { 892 .core_note_type = NT_PRSTATUS, 893 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), 894 .size = sizeof(compat_long_t), 895 .align = sizeof(compat_long_t), 896 .get = s390_compat_regs_get, 897 .set = s390_compat_regs_set, 898 }, 899 [REGSET_FP] = { 900 .core_note_type = NT_PRFPREG, 901 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), 902 .size = sizeof(compat_long_t), 903 .align = sizeof(compat_long_t), 904 .get = s390_fpregs_get, 905 .set = s390_fpregs_set, 906 }, 907 }; 908 909 static const struct user_regset_view user_s390_compat_view = { 910 .name = "s390", 911 .e_machine = EM_S390, 912 .regsets = s390_compat_regsets, 913 .n = ARRAY_SIZE(s390_compat_regsets) 914 }; 915 #endif 916 917 const struct user_regset_view *task_user_regset_view(struct task_struct *task) 918 { 919 #ifdef CONFIG_COMPAT 920 if (test_tsk_thread_flag(task, TIF_31BIT)) 921 return &user_s390_compat_view; 922 #endif 923 return &user_s390_view; 924 } 925