elfcore.c revision 330449
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2017 Dell EMC 5 * Copyright (c) 2007 Sandvine Incorporated 6 * Copyright (c) 1998 John D. Polstra 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/11/usr.bin/gcore/elfcore.c 330449 2018-03-05 07:26:05Z eadler $"); 33 34#include <sys/endian.h> 35#include <sys/param.h> 36#include <sys/procfs.h> 37#include <sys/ptrace.h> 38#include <sys/queue.h> 39#include <sys/linker_set.h> 40#include <sys/sbuf.h> 41#include <sys/sysctl.h> 42#include <sys/user.h> 43#include <sys/wait.h> 44#include <machine/elf.h> 45#include <vm/vm_param.h> 46#include <vm/vm.h> 47#include <vm/pmap.h> 48#include <vm/vm_map.h> 49#include <assert.h> 50#include <err.h> 51#include <errno.h> 52#include <fcntl.h> 53#include <stdbool.h> 54#include <stdint.h> 55#include <stdio.h> 56#include <stdlib.h> 57#include <string.h> 58#include <unistd.h> 59#include <libutil.h> 60 61#include "extern.h" 62 63/* 64 * Code for generating ELF core dumps. 65 */ 66 67typedef void (*segment_callback)(vm_map_entry_t, void *); 68 69/* Closure for cb_put_phdr(). */ 70struct phdr_closure { 71 Elf_Phdr *phdr; /* Program header to fill in */ 72 Elf_Off offset; /* Offset of segment in core file */ 73}; 74 75/* Closure for cb_size_segment(). */ 76struct sseg_closure { 77 int count; /* Count of writable segments. */ 78 size_t size; /* Total size of all writable segments. */ 79}; 80 81#ifdef ELFCORE_COMPAT_32 82typedef struct fpreg32 elfcore_fpregset_t; 83typedef struct reg32 elfcore_gregset_t; 84typedef struct prpsinfo32 elfcore_prpsinfo_t; 85typedef struct prstatus32 elfcore_prstatus_t; 86typedef struct ptrace_lwpinfo32 elfcore_lwpinfo_t; 87static void elf_convert_gregset(elfcore_gregset_t *rd, struct reg *rs); 88static void elf_convert_fpregset(elfcore_fpregset_t *rd, struct fpreg *rs); 89static void elf_convert_lwpinfo(struct ptrace_lwpinfo32 *pld, 90 struct ptrace_lwpinfo *pls); 91#else 92typedef fpregset_t elfcore_fpregset_t; 93typedef gregset_t elfcore_gregset_t; 94typedef prpsinfo_t elfcore_prpsinfo_t; 95typedef prstatus_t elfcore_prstatus_t; 96typedef struct ptrace_lwpinfo elfcore_lwpinfo_t; 97#define elf_convert_gregset(d,s) *d = *s 98#define elf_convert_fpregset(d,s) *d = *s 99#define elf_convert_lwpinfo(d,s) *d = *s 100#endif 101 102typedef void* (*notefunc_t)(void *, size_t *); 103 104static void cb_put_phdr(vm_map_entry_t, void *); 105static void cb_size_segment(vm_map_entry_t, void *); 106static void each_writable_segment(vm_map_entry_t, segment_callback, 107 void *closure); 108static void elf_detach(void); /* atexit() handler. */ 109static void *elf_note_fpregset(void *, size_t *); 110static void *elf_note_prpsinfo(void *, size_t *); 111static void *elf_note_prstatus(void *, size_t *); 112static void *elf_note_thrmisc(void *, size_t *); 113static void *elf_note_ptlwpinfo(void *, size_t *); 114#if defined(__arm__) 115static void *elf_note_arm_vfp(void *, size_t *); 116#endif 117#if defined(__i386__) || defined(__amd64__) 118static void *elf_note_x86_xstate(void *, size_t *); 119#endif 120#if defined(__powerpc__) 121static void *elf_note_powerpc_vmx(void *, size_t *); 122#endif 123static void *elf_note_procstat_auxv(void *, size_t *); 124static void *elf_note_procstat_files(void *, size_t *); 125static void *elf_note_procstat_groups(void *, size_t *); 126static void *elf_note_procstat_osrel(void *, size_t *); 127static void *elf_note_procstat_proc(void *, size_t *); 128static void *elf_note_procstat_psstrings(void *, size_t *); 129static void *elf_note_procstat_rlimit(void *, size_t *); 130static void *elf_note_procstat_umask(void *, size_t *); 131static void *elf_note_procstat_vmmap(void *, size_t *); 132static void elf_puthdr(int, pid_t, vm_map_entry_t, void *, size_t, size_t, 133 size_t, int); 134static void elf_putnote(int, notefunc_t, void *, struct sbuf *); 135static void elf_putnotes(pid_t, struct sbuf *, size_t *); 136static void freemap(vm_map_entry_t); 137static vm_map_entry_t readmap(pid_t); 138static void *procstat_sysctl(void *, int, size_t, size_t *sizep); 139 140static pid_t g_pid; /* Pid being dumped, global for elf_detach */ 141static int g_status; /* proc status after ptrace attach */ 142 143static int 144elf_ident(int efd, pid_t pid __unused, char *binfile __unused) 145{ 146 Elf_Ehdr hdr; 147 int cnt; 148 uint16_t machine; 149 150 cnt = read(efd, &hdr, sizeof(hdr)); 151 if (cnt != sizeof(hdr)) 152 return (0); 153 if (!IS_ELF(hdr)) 154 return (0); 155 switch (hdr.e_ident[EI_DATA]) { 156 case ELFDATA2LSB: 157 machine = le16toh(hdr.e_machine); 158 break; 159 case ELFDATA2MSB: 160 machine = be16toh(hdr.e_machine); 161 break; 162 default: 163 return (0); 164 } 165 if (!ELF_MACHINE_OK(machine)) 166 return (0); 167 168 /* Looks good. */ 169 return (1); 170} 171 172static void 173elf_detach(void) 174{ 175 int sig; 176 177 if (g_pid != 0) { 178 /* 179 * Forward any pending signals. SIGSTOP is generated by ptrace 180 * itself, so ignore it. 181 */ 182 sig = WIFSTOPPED(g_status) ? WSTOPSIG(g_status) : 0; 183 if (sig == SIGSTOP) 184 sig = 0; 185 ptrace(PT_DETACH, g_pid, (caddr_t)1, sig); 186 } 187} 188 189/* 190 * Write an ELF coredump for the given pid to the given fd. 191 */ 192static void 193elf_coredump(int efd, int fd, pid_t pid) 194{ 195 vm_map_entry_t map; 196 struct sseg_closure seginfo; 197 struct sbuf *sb; 198 void *hdr; 199 size_t hdrsize, notesz, segoff; 200 ssize_t n, old_len; 201 Elf_Phdr *php; 202 int i; 203 204 /* Attach to process to dump. */ 205 g_pid = pid; 206 if (atexit(elf_detach) != 0) 207 err(1, "atexit"); 208 errno = 0; 209 ptrace(PT_ATTACH, pid, NULL, 0); 210 if (errno) 211 err(1, "PT_ATTACH"); 212 if (waitpid(pid, &g_status, 0) == -1) 213 err(1, "waitpid"); 214 215 /* Get the program's memory map. */ 216 map = readmap(pid); 217 218 /* Size the program segments. */ 219 seginfo.count = 0; 220 seginfo.size = 0; 221 each_writable_segment(map, cb_size_segment, &seginfo); 222 223 /* 224 * Build the header and the notes using sbuf and write to the file. 225 */ 226 sb = sbuf_new_auto(); 227 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 228 /* Start header + notes section. */ 229 sbuf_start_section(sb, NULL); 230 /* Make empty header subsection. */ 231 sbuf_start_section(sb, &old_len); 232 sbuf_putc(sb, 0); 233 sbuf_end_section(sb, old_len, hdrsize, 0); 234 /* Put notes. */ 235 elf_putnotes(pid, sb, ¬esz); 236 /* Align up to a page boundary for the program segments. */ 237 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 238 if (sbuf_finish(sb) != 0) 239 err(1, "sbuf_finish"); 240 hdr = sbuf_data(sb); 241 segoff = sbuf_len(sb); 242 /* Fill in the header. */ 243 elf_puthdr(efd, pid, map, hdr, hdrsize, notesz, segoff, seginfo.count); 244 245 n = write(fd, hdr, segoff); 246 if (n == -1) 247 err(1, "write"); 248 if (n < segoff) 249 errx(1, "short write"); 250 251 /* Write the contents of all of the writable segments. */ 252 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 253 for (i = 0; i < seginfo.count; i++) { 254 struct ptrace_io_desc iorequest; 255 uintmax_t nleft = php->p_filesz; 256 257 iorequest.piod_op = PIOD_READ_D; 258 iorequest.piod_offs = (caddr_t)(uintptr_t)php->p_vaddr; 259 while (nleft > 0) { 260 char buf[8*1024]; 261 size_t nwant; 262 ssize_t ngot; 263 264 if (nleft > sizeof(buf)) 265 nwant = sizeof buf; 266 else 267 nwant = nleft; 268 iorequest.piod_addr = buf; 269 iorequest.piod_len = nwant; 270 ptrace(PT_IO, pid, (caddr_t)&iorequest, 0); 271 ngot = iorequest.piod_len; 272 if ((size_t)ngot < nwant) 273 errx(1, "short read wanted %zu, got %zd", 274 nwant, ngot); 275 ngot = write(fd, buf, nwant); 276 if (ngot == -1) 277 err(1, "write of segment %d failed", i); 278 if ((size_t)ngot != nwant) 279 errx(1, "short write"); 280 nleft -= nwant; 281 iorequest.piod_offs += ngot; 282 } 283 php++; 284 } 285 sbuf_delete(sb); 286 freemap(map); 287} 288 289/* 290 * A callback for each_writable_segment() to write out the segment's 291 * program header entry. 292 */ 293static void 294cb_put_phdr(vm_map_entry_t entry, void *closure) 295{ 296 struct phdr_closure *phc = (struct phdr_closure *)closure; 297 Elf_Phdr *phdr = phc->phdr; 298 299 phc->offset = round_page(phc->offset); 300 301 phdr->p_type = PT_LOAD; 302 phdr->p_offset = phc->offset; 303 phdr->p_vaddr = entry->start; 304 phdr->p_paddr = 0; 305 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 306 phdr->p_align = PAGE_SIZE; 307 phdr->p_flags = 0; 308 if (entry->protection & VM_PROT_READ) 309 phdr->p_flags |= PF_R; 310 if (entry->protection & VM_PROT_WRITE) 311 phdr->p_flags |= PF_W; 312 if (entry->protection & VM_PROT_EXECUTE) 313 phdr->p_flags |= PF_X; 314 315 phc->offset += phdr->p_filesz; 316 phc->phdr++; 317} 318 319/* 320 * A callback for each_writable_segment() to gather information about 321 * the number of segments and their total size. 322 */ 323static void 324cb_size_segment(vm_map_entry_t entry, void *closure) 325{ 326 struct sseg_closure *ssc = (struct sseg_closure *)closure; 327 328 ssc->count++; 329 ssc->size += entry->end - entry->start; 330} 331 332/* 333 * For each segment in the given memory map, call the given function 334 * with a pointer to the map entry and some arbitrary caller-supplied 335 * data. 336 */ 337static void 338each_writable_segment(vm_map_entry_t map, segment_callback func, void *closure) 339{ 340 vm_map_entry_t entry; 341 342 for (entry = map; entry != NULL; entry = entry->next) 343 (*func)(entry, closure); 344} 345 346static void 347elf_putnotes(pid_t pid, struct sbuf *sb, size_t *sizep) 348{ 349 lwpid_t *tids; 350 size_t threads, old_len; 351 ssize_t size; 352 int i; 353 354 errno = 0; 355 threads = ptrace(PT_GETNUMLWPS, pid, NULL, 0); 356 if (errno) 357 err(1, "PT_GETNUMLWPS"); 358 tids = malloc(threads * sizeof(*tids)); 359 if (tids == NULL) 360 errx(1, "out of memory"); 361 errno = 0; 362 ptrace(PT_GETLWPLIST, pid, (void *)tids, threads); 363 if (errno) 364 err(1, "PT_GETLWPLIST"); 365 366 sbuf_start_section(sb, &old_len); 367 elf_putnote(NT_PRPSINFO, elf_note_prpsinfo, &pid, sb); 368 369 for (i = 0; i < threads; ++i) { 370 elf_putnote(NT_PRSTATUS, elf_note_prstatus, tids + i, sb); 371 elf_putnote(NT_FPREGSET, elf_note_fpregset, tids + i, sb); 372 elf_putnote(NT_THRMISC, elf_note_thrmisc, tids + i, sb); 373 elf_putnote(NT_PTLWPINFO, elf_note_ptlwpinfo, tids + i, sb); 374#if defined(__arm__) 375 elf_putnote(NT_ARM_VFP, elf_note_arm_vfp, tids + i, sb); 376#endif 377#if defined(__i386__) || defined(__amd64__) 378 elf_putnote(NT_X86_XSTATE, elf_note_x86_xstate, tids + i, sb); 379#endif 380#if defined(__powerpc__) 381 elf_putnote(NT_PPC_VMX, elf_note_powerpc_vmx, tids + i, sb); 382#endif 383 } 384 385#ifndef ELFCORE_COMPAT_32 386 elf_putnote(NT_PROCSTAT_PROC, elf_note_procstat_proc, &pid, sb); 387 elf_putnote(NT_PROCSTAT_FILES, elf_note_procstat_files, &pid, sb); 388 elf_putnote(NT_PROCSTAT_VMMAP, elf_note_procstat_vmmap, &pid, sb); 389 elf_putnote(NT_PROCSTAT_GROUPS, elf_note_procstat_groups, &pid, sb); 390 elf_putnote(NT_PROCSTAT_UMASK, elf_note_procstat_umask, &pid, sb); 391 elf_putnote(NT_PROCSTAT_RLIMIT, elf_note_procstat_rlimit, &pid, sb); 392 elf_putnote(NT_PROCSTAT_OSREL, elf_note_procstat_osrel, &pid, sb); 393 elf_putnote(NT_PROCSTAT_PSSTRINGS, elf_note_procstat_psstrings, &pid, 394 sb); 395 elf_putnote(NT_PROCSTAT_AUXV, elf_note_procstat_auxv, &pid, sb); 396#endif 397 398 size = sbuf_end_section(sb, old_len, 1, 0); 399 if (size == -1) 400 err(1, "sbuf_end_section"); 401 free(tids); 402 *sizep = size; 403} 404 405/* 406 * Emit one note section to sbuf. 407 */ 408static void 409elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb) 410{ 411 Elf_Note note; 412 size_t descsz; 413 ssize_t old_len; 414 void *desc; 415 416 desc = notefunc(arg, &descsz); 417 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */ 418 note.n_descsz = descsz; 419 note.n_type = type; 420 421 sbuf_bcat(sb, ¬e, sizeof(note)); 422 sbuf_start_section(sb, &old_len); 423 sbuf_bcat(sb, "FreeBSD", note.n_namesz); 424 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0); 425 if (descsz == 0) 426 return; 427 sbuf_start_section(sb, &old_len); 428 sbuf_bcat(sb, desc, descsz); 429 sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0); 430 free(desc); 431} 432 433/* 434 * Generate the ELF coredump header. 435 */ 436static void 437elf_puthdr(int efd, pid_t pid, vm_map_entry_t map, void *hdr, size_t hdrsize, 438 size_t notesz, size_t segoff, int numsegs) 439{ 440 Elf_Ehdr *ehdr, binhdr; 441 Elf_Phdr *phdr; 442 struct phdr_closure phc; 443 ssize_t cnt; 444 445 cnt = read(efd, &binhdr, sizeof(binhdr)); 446 if (cnt < 0) 447 err(1, "Failed to re-read ELF header"); 448 else if (cnt != sizeof(binhdr)) 449 errx(1, "Failed to re-read ELF header"); 450 451 ehdr = (Elf_Ehdr *)hdr; 452 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 453 454 ehdr->e_ident[EI_MAG0] = ELFMAG0; 455 ehdr->e_ident[EI_MAG1] = ELFMAG1; 456 ehdr->e_ident[EI_MAG2] = ELFMAG2; 457 ehdr->e_ident[EI_MAG3] = ELFMAG3; 458 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 459 ehdr->e_ident[EI_DATA] = ELF_DATA; 460 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 461 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 462 ehdr->e_ident[EI_ABIVERSION] = 0; 463 ehdr->e_ident[EI_PAD] = 0; 464 ehdr->e_type = ET_CORE; 465 ehdr->e_machine = binhdr.e_machine; 466 ehdr->e_version = EV_CURRENT; 467 ehdr->e_entry = 0; 468 ehdr->e_phoff = sizeof(Elf_Ehdr); 469 ehdr->e_flags = binhdr.e_flags; 470 ehdr->e_ehsize = sizeof(Elf_Ehdr); 471 ehdr->e_phentsize = sizeof(Elf_Phdr); 472 ehdr->e_phnum = numsegs + 1; 473 ehdr->e_shentsize = sizeof(Elf_Shdr); 474 ehdr->e_shnum = 0; 475 ehdr->e_shstrndx = SHN_UNDEF; 476 477 /* 478 * Fill in the program header entries. 479 */ 480 481 /* The note segement. */ 482 phdr->p_type = PT_NOTE; 483 phdr->p_offset = hdrsize; 484 phdr->p_vaddr = 0; 485 phdr->p_paddr = 0; 486 phdr->p_filesz = notesz; 487 phdr->p_memsz = 0; 488 phdr->p_flags = PF_R; 489 phdr->p_align = sizeof(Elf32_Size); 490 phdr++; 491 492 /* All the writable segments from the program. */ 493 phc.phdr = phdr; 494 phc.offset = segoff; 495 each_writable_segment(map, cb_put_phdr, &phc); 496} 497 498/* 499 * Free the memory map. 500 */ 501static void 502freemap(vm_map_entry_t map) 503{ 504 505 while (map != NULL) { 506 vm_map_entry_t next = map->next; 507 free(map); 508 map = next; 509 } 510} 511 512/* 513 * Read the process's memory map using kinfo_getvmmap(), and return a list of 514 * VM map entries. Only the non-device read/writable segments are 515 * returned. The map entries in the list aren't fully filled in; only 516 * the items we need are present. 517 */ 518static vm_map_entry_t 519readmap(pid_t pid) 520{ 521 vm_map_entry_t ent, *linkp, map; 522 struct kinfo_vmentry *vmentl, *kve; 523 int i, nitems; 524 525 vmentl = kinfo_getvmmap(pid, &nitems); 526 if (vmentl == NULL) 527 err(1, "cannot retrieve mappings for %u process", pid); 528 529 map = NULL; 530 linkp = ↦ 531 for (i = 0; i < nitems; i++) { 532 kve = &vmentl[i]; 533 534 /* 535 * Ignore 'malformed' segments or ones representing memory 536 * mapping with MAP_NOCORE on. 537 * If the 'full' support is disabled, just dump the most 538 * meaningful data segments. 539 */ 540 if ((kve->kve_protection & KVME_PROT_READ) == 0 || 541 (kve->kve_flags & KVME_FLAG_NOCOREDUMP) != 0 || 542 kve->kve_type == KVME_TYPE_DEAD || 543 kve->kve_type == KVME_TYPE_UNKNOWN || 544 ((pflags & PFLAGS_FULL) == 0 && 545 kve->kve_type != KVME_TYPE_DEFAULT && 546 kve->kve_type != KVME_TYPE_VNODE && 547 kve->kve_type != KVME_TYPE_SWAP && 548 kve->kve_type != KVME_TYPE_PHYS)) 549 continue; 550 551 ent = calloc(1, sizeof(*ent)); 552 if (ent == NULL) 553 errx(1, "out of memory"); 554 ent->start = (vm_offset_t)kve->kve_start; 555 ent->end = (vm_offset_t)kve->kve_end; 556 ent->protection = VM_PROT_READ | VM_PROT_WRITE; 557 if ((kve->kve_protection & KVME_PROT_EXEC) != 0) 558 ent->protection |= VM_PROT_EXECUTE; 559 560 *linkp = ent; 561 linkp = &ent->next; 562 } 563 free(vmentl); 564 return (map); 565} 566 567/* 568 * Miscellaneous note out functions. 569 */ 570 571static void * 572elf_note_prpsinfo(void *arg, size_t *sizep) 573{ 574 char *cp, *end; 575 pid_t pid; 576 elfcore_prpsinfo_t *psinfo; 577 struct kinfo_proc kip; 578 size_t len; 579 int name[4]; 580 581 pid = *(pid_t *)arg; 582 psinfo = calloc(1, sizeof(*psinfo)); 583 if (psinfo == NULL) 584 errx(1, "out of memory"); 585 psinfo->pr_version = PRPSINFO_VERSION; 586 psinfo->pr_psinfosz = sizeof(*psinfo); 587 588 name[0] = CTL_KERN; 589 name[1] = KERN_PROC; 590 name[2] = KERN_PROC_PID; 591 name[3] = pid; 592 len = sizeof(kip); 593 if (sysctl(name, 4, &kip, &len, NULL, 0) == -1) 594 err(1, "kern.proc.pid.%u", pid); 595 if (kip.ki_pid != pid) 596 err(1, "kern.proc.pid.%u", pid); 597 strlcpy(psinfo->pr_fname, kip.ki_comm, sizeof(psinfo->pr_fname)); 598 name[2] = KERN_PROC_ARGS; 599 len = sizeof(psinfo->pr_psargs) - 1; 600 if (sysctl(name, 4, psinfo->pr_psargs, &len, NULL, 0) == 0 && len > 0) { 601 cp = psinfo->pr_psargs; 602 end = cp + len - 1; 603 for (;;) { 604 cp = memchr(cp, '\0', end - cp); 605 if (cp == NULL) 606 break; 607 *cp = ' '; 608 } 609 } else 610 strlcpy(psinfo->pr_psargs, kip.ki_comm, 611 sizeof(psinfo->pr_psargs)); 612 psinfo->pr_pid = pid; 613 614 *sizep = sizeof(*psinfo); 615 return (psinfo); 616} 617 618static void * 619elf_note_prstatus(void *arg, size_t *sizep) 620{ 621 lwpid_t tid; 622 elfcore_prstatus_t *status; 623 struct reg greg; 624 625 tid = *(lwpid_t *)arg; 626 status = calloc(1, sizeof(*status)); 627 if (status == NULL) 628 errx(1, "out of memory"); 629 status->pr_version = PRSTATUS_VERSION; 630 status->pr_statussz = sizeof(*status); 631 status->pr_gregsetsz = sizeof(elfcore_gregset_t); 632 status->pr_fpregsetsz = sizeof(elfcore_fpregset_t); 633 status->pr_osreldate = __FreeBSD_version; 634 status->pr_pid = tid; 635 ptrace(PT_GETREGS, tid, (void *)&greg, 0); 636 elf_convert_gregset(&status->pr_reg, &greg); 637 638 *sizep = sizeof(*status); 639 return (status); 640} 641 642static void * 643elf_note_fpregset(void *arg, size_t *sizep) 644{ 645 lwpid_t tid; 646 elfcore_fpregset_t *fpregset; 647 fpregset_t fpreg; 648 649 tid = *(lwpid_t *)arg; 650 fpregset = calloc(1, sizeof(*fpregset)); 651 if (fpregset == NULL) 652 errx(1, "out of memory"); 653 ptrace(PT_GETFPREGS, tid, (void *)&fpreg, 0); 654 elf_convert_fpregset(fpregset, &fpreg); 655 656 *sizep = sizeof(*fpregset); 657 return (fpregset); 658} 659 660static void * 661elf_note_thrmisc(void *arg, size_t *sizep) 662{ 663 lwpid_t tid; 664 struct ptrace_lwpinfo lwpinfo; 665 thrmisc_t *thrmisc; 666 667 tid = *(lwpid_t *)arg; 668 thrmisc = calloc(1, sizeof(*thrmisc)); 669 if (thrmisc == NULL) 670 errx(1, "out of memory"); 671 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, 672 sizeof(lwpinfo)); 673 memset(&thrmisc->_pad, 0, sizeof(thrmisc->_pad)); 674 strcpy(thrmisc->pr_tname, lwpinfo.pl_tdname); 675 676 *sizep = sizeof(*thrmisc); 677 return (thrmisc); 678} 679 680static void * 681elf_note_ptlwpinfo(void *arg, size_t *sizep) 682{ 683 lwpid_t tid; 684 elfcore_lwpinfo_t *elf_info; 685 struct ptrace_lwpinfo lwpinfo; 686 void *p; 687 688 tid = *(lwpid_t *)arg; 689 p = calloc(1, sizeof(int) + sizeof(elfcore_lwpinfo_t)); 690 if (p == NULL) 691 errx(1, "out of memory"); 692 *(int *)p = sizeof(elfcore_lwpinfo_t); 693 elf_info = (void *)((int *)p + 1); 694 ptrace(PT_LWPINFO, tid, (void *)&lwpinfo, sizeof(lwpinfo)); 695 elf_convert_lwpinfo(elf_info, &lwpinfo); 696 697 *sizep = sizeof(int) + sizeof(struct ptrace_lwpinfo); 698 return (p); 699} 700 701#if defined(__arm__) 702static void * 703elf_note_arm_vfp(void *arg, size_t *sizep) 704{ 705 lwpid_t tid; 706 struct vfpreg *vfp; 707 static bool has_vfp = true; 708 struct vfpreg info; 709 710 tid = *(lwpid_t *)arg; 711 if (has_vfp) { 712 if (ptrace(PT_GETVFPREGS, tid, (void *)&info, 0) != 0) 713 has_vfp = false; 714 } 715 if (!has_vfp) { 716 *sizep = 0; 717 return (NULL); 718 } 719 vfp = calloc(1, sizeof(*vfp)); 720 memcpy(vfp, &info, sizeof(*vfp)); 721 *sizep = sizeof(*vfp); 722 return (vfp); 723} 724#endif 725 726#if defined(__i386__) || defined(__amd64__) 727static void * 728elf_note_x86_xstate(void *arg, size_t *sizep) 729{ 730 lwpid_t tid; 731 char *xstate; 732 static bool xsave_checked = false; 733 static struct ptrace_xstate_info info; 734 735 tid = *(lwpid_t *)arg; 736 if (!xsave_checked) { 737 if (ptrace(PT_GETXSTATE_INFO, tid, (void *)&info, 738 sizeof(info)) != 0) 739 info.xsave_len = 0; 740 xsave_checked = true; 741 } 742 if (info.xsave_len == 0) { 743 *sizep = 0; 744 return (NULL); 745 } 746 xstate = calloc(1, info.xsave_len); 747 ptrace(PT_GETXSTATE, tid, xstate, 0); 748 *(uint64_t *)(xstate + X86_XSTATE_XCR0_OFFSET) = info.xsave_mask; 749 *sizep = info.xsave_len; 750 return (xstate); 751} 752#endif 753 754#if defined(__powerpc__) 755static void * 756elf_note_powerpc_vmx(void *arg, size_t *sizep) 757{ 758 lwpid_t tid; 759 struct vmxreg *vmx; 760 static bool has_vmx = true; 761 struct vmxreg info; 762 763 tid = *(lwpid_t *)arg; 764 if (has_vmx) { 765 if (ptrace(PT_GETVRREGS, tid, (void *)&info, 766 sizeof(info)) != 0) 767 has_vmx = false; 768 } 769 if (!has_vmx) { 770 *sizep = 0; 771 return (NULL); 772 } 773 vmx = calloc(1, sizeof(*vmx)); 774 memcpy(vmx, &info, sizeof(*vmx)); 775 *sizep = sizeof(*vmx); 776 return (vmx); 777} 778#endif 779 780static void * 781procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep) 782{ 783 size_t len; 784 pid_t pid; 785 int name[4], structsize; 786 void *buf, *p; 787 788 pid = *(pid_t *)arg; 789 structsize = structsz; 790 name[0] = CTL_KERN; 791 name[1] = KERN_PROC; 792 name[2] = what; 793 name[3] = pid; 794 len = 0; 795 if (sysctl(name, 4, NULL, &len, NULL, 0) == -1) 796 err(1, "kern.proc.%d.%u", what, pid); 797 buf = calloc(1, sizeof(structsize) + len * 4 / 3); 798 if (buf == NULL) 799 errx(1, "out of memory"); 800 bcopy(&structsize, buf, sizeof(structsize)); 801 p = (char *)buf + sizeof(structsize); 802 if (sysctl(name, 4, p, &len, NULL, 0) == -1) 803 err(1, "kern.proc.%d.%u", what, pid); 804 805 *sizep = sizeof(structsize) + len; 806 return (buf); 807} 808 809static void * 810elf_note_procstat_proc(void *arg, size_t *sizep) 811{ 812 813 return (procstat_sysctl(arg, KERN_PROC_PID | KERN_PROC_INC_THREAD, 814 sizeof(struct kinfo_proc), sizep)); 815} 816 817static void * 818elf_note_procstat_files(void *arg, size_t *sizep) 819{ 820 821 return (procstat_sysctl(arg, KERN_PROC_FILEDESC, 822 sizeof(struct kinfo_file), sizep)); 823} 824 825static void * 826elf_note_procstat_vmmap(void *arg, size_t *sizep) 827{ 828 829 return (procstat_sysctl(arg, KERN_PROC_VMMAP, 830 sizeof(struct kinfo_vmentry), sizep)); 831} 832 833static void * 834elf_note_procstat_groups(void *arg, size_t *sizep) 835{ 836 837 return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep)); 838} 839 840static void * 841elf_note_procstat_umask(void *arg, size_t *sizep) 842{ 843 844 return (procstat_sysctl(arg, KERN_PROC_UMASK, sizeof(u_short), sizep)); 845} 846 847static void * 848elf_note_procstat_osrel(void *arg, size_t *sizep) 849{ 850 851 return (procstat_sysctl(arg, KERN_PROC_OSREL, sizeof(int), sizep)); 852} 853 854static void * 855elf_note_procstat_psstrings(void *arg, size_t *sizep) 856{ 857 858 return (procstat_sysctl(arg, KERN_PROC_PS_STRINGS, 859 sizeof(vm_offset_t), sizep)); 860} 861 862static void * 863elf_note_procstat_auxv(void *arg, size_t *sizep) 864{ 865 866 return (procstat_sysctl(arg, KERN_PROC_AUXV, 867 sizeof(Elf_Auxinfo), sizep)); 868} 869 870static void * 871elf_note_procstat_rlimit(void *arg, size_t *sizep) 872{ 873 pid_t pid; 874 size_t len; 875 int i, name[5], structsize; 876 void *buf, *p; 877 878 pid = *(pid_t *)arg; 879 structsize = sizeof(struct rlimit) * RLIM_NLIMITS; 880 buf = calloc(1, sizeof(structsize) + structsize); 881 if (buf == NULL) 882 errx(1, "out of memory"); 883 bcopy(&structsize, buf, sizeof(structsize)); 884 p = (char *)buf + sizeof(structsize); 885 name[0] = CTL_KERN; 886 name[1] = KERN_PROC; 887 name[2] = KERN_PROC_RLIMIT; 888 name[3] = pid; 889 len = sizeof(struct rlimit); 890 for (i = 0; i < RLIM_NLIMITS; i++) { 891 name[4] = i; 892 if (sysctl(name, 5, p, &len, NULL, 0) == -1) 893 err(1, "kern.proc.rlimit.%u", pid); 894 if (len != sizeof(struct rlimit)) 895 errx(1, "kern.proc.rlimit.%u: short read", pid); 896 p += len; 897 } 898 899 *sizep = sizeof(structsize) + structsize; 900 return (buf); 901} 902 903struct dumpers __elfN(dump) = { elf_ident, elf_coredump }; 904TEXT_SET(dumpset, __elfN(dump)); 905