freebsd-dev/usr.bin/gcore/elfcore.c
Warner Losh 1d386b48a5 Remove $FreeBSD$: one-line .c pattern
Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/
2023-08-16 11:54:42 -06:00

879 lines
22 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2017 Dell EMC
* Copyright (c) 2007 Sandvine Incorporated
* Copyright (c) 1998 John D. Polstra
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/endian.h>
#include <sys/param.h>
#include <sys/procfs.h>
#include <sys/ptrace.h>
#include <sys/queue.h>
#include <sys/linker_set.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <machine/elf.h>
#include <vm/vm_param.h>
#include <vm/vm.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libutil.h>
#include "extern.h"
/*
* Code for generating ELF core dumps.
*/
struct map_entry {
struct map_entry *next;
vm_offset_t start;
vm_offset_t end;
vm_prot_t protection;
};
typedef void (*segment_callback)(struct map_entry *, void *);
/* Closure for cb_put_phdr(). */
struct phdr_closure {
Elf_Phdr *phdr; /* Program header to fill in */
Elf_Off offset; /* Offset of segment in core file */
};
/* Closure for cb_size_segment(). */
struct sseg_closure {
int count; /* Count of writable segments. */
size_t size; /* Total size of all writable segments. */
};
#ifdef ELFCORE_COMPAT_32
typedef struct prpsinfo32 elfcore_prpsinfo_t;
#else
typedef prpsinfo_t elfcore_prpsinfo_t;
#endif
typedef void* (*notefunc_t)(void *, size_t *);
static void cb_put_phdr(struct map_entry *, void *);
static void cb_size_segment(struct map_entry *, void *);
static void each_dumpable_segment(struct map_entry *, segment_callback,
void *closure);
static void elf_detach(void); /* atexit() handler. */
static void *elf_note_prpsinfo(void *, size_t *);
#if defined(__i386__) || defined(__amd64__)
static void *elf_note_x86_xstate(void *, size_t *);
#endif
#if defined(__powerpc__)
static void *elf_note_powerpc_vmx(void *, size_t *);
static void *elf_note_powerpc_vsx(void *, size_t *);
#endif
static void *elf_note_procstat_auxv(void *, size_t *);
static void *elf_note_procstat_files(void *, size_t *);
static void *elf_note_procstat_groups(void *, size_t *);
static void *elf_note_procstat_osrel(void *, size_t *);
static void *elf_note_procstat_proc(void *, size_t *);
static void *elf_note_procstat_psstrings(void *, size_t *);
static void *elf_note_procstat_rlimit(void *, size_t *);
static void *elf_note_procstat_umask(void *, size_t *);
static void *elf_note_procstat_vmmap(void *, size_t *);
static void elf_puthdr(int, pid_t, struct map_entry *, void *, size_t, size_t,
size_t, int);
static void elf_putnote(int, notefunc_t, void *, struct sbuf *);
static void elf_putnotes(pid_t, struct sbuf *, size_t *);
static void elf_putregnote(int, lwpid_t, struct sbuf *);
static void freemap(struct map_entry *);
static struct map_entry *readmap(pid_t);
static void *procstat_sysctl(void *, int, size_t, size_t *sizep);
static pid_t g_pid; /* Pid being dumped, global for elf_detach */
static int g_status; /* proc status after ptrace attach */
static int
elf_ident(int efd, pid_t pid __unused, char *binfile __unused)
{
Elf_Ehdr hdr;
int cnt;
uint16_t machine;
cnt = read(efd, &hdr, sizeof(hdr));
if (cnt != sizeof(hdr))
return (0);
if (!IS_ELF(hdr))
return (0);
switch (hdr.e_ident[EI_DATA]) {
case ELFDATA2LSB:
machine = le16toh(hdr.e_machine);
break;
case ELFDATA2MSB:
machine = be16toh(hdr.e_machine);
break;
default:
return (0);
}
if (!ELF_MACHINE_OK(machine))
return (0);
/* Looks good. */
return (1);
}
static void
elf_detach(void)
{
int sig;
if (g_pid != 0) {
/*
* Forward any pending signals. SIGSTOP is generated by ptrace
* itself, so ignore it.
*/
sig = WIFSTOPPED(g_status) ? WSTOPSIG(g_status) : 0;
if (sig == SIGSTOP)
sig = 0;
ptrace(PT_DETACH, g_pid, (caddr_t)1, sig);
}
}
/*
* Write an ELF coredump for the given pid to the given fd.
*/
static void
elf_coredump(int efd, int fd, pid_t pid)
{
struct map_entry *map;
struct sseg_closure seginfo;
struct sbuf *sb;
void *hdr;
size_t hdrsize, notesz, segoff;
ssize_t n, old_len;
Elf_Phdr *php;
int i;
/* Attach to process to dump. */
g_pid = pid;
if (atexit(elf_detach) != 0)
err(1, "atexit");
errno = 0;
ptrace(PT_ATTACH, pid, NULL, 0);
if (errno)
err(1, "PT_ATTACH");
if (waitpid(pid, &g_status, 0) == -1)
err(1, "waitpid");
/* Get the program's memory map. */
map = readmap(pid);
/* Size the program segments. */
seginfo.count = 0;
seginfo.size = 0;
each_dumpable_segment(map, cb_size_segment, &seginfo);
/*
* Build the header and the notes using sbuf and write to the file.
*/
sb = sbuf_new_auto();
hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count);
if (seginfo.count + 1 >= PN_XNUM)
hdrsize += sizeof(Elf_Shdr);
/* Start header + notes section. */
sbuf_start_section(sb, NULL);
/* Make empty header subsection. */
sbuf_start_section(sb, &old_len);
sbuf_putc(sb, 0);
sbuf_end_section(sb, old_len, hdrsize, 0);
/* Put notes. */
elf_putnotes(pid, sb, &notesz);
/* Align up to a page boundary for the program segments. */
sbuf_end_section(sb, -1, getpagesize(), 0);
if (sbuf_finish(sb) != 0)
err(1, "sbuf_finish");
hdr = sbuf_data(sb);
segoff = sbuf_len(sb);
/* Fill in the header. */
elf_puthdr(efd, pid, map, hdr, hdrsize, notesz, segoff, seginfo.count);
n = write(fd, hdr, segoff);
if (n == -1)
err(1, "write");
if (n < segoff)
errx(1, "short write");
/* Write the contents of all of the writable segments. */
php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
for (i = 0; i < seginfo.count; i++) {
struct ptrace_io_desc iorequest;
uintmax_t nleft = php->p_filesz;
iorequest.piod_op = PIOD_READ_D;
iorequest.piod_offs = (caddr_t)(uintptr_t)php->p_vaddr;
while (nleft > 0) {
char buf[8*1024];
size_t nwant;
ssize_t ngot;
if (nleft > sizeof(buf))
nwant = sizeof buf;
else
nwant = nleft;
iorequest.piod_addr = buf;
iorequest.piod_len = nwant;
ptrace(PT_IO, pid, (caddr_t)&iorequest, 0);
ngot = iorequest.piod_len;
if ((size_t)ngot < nwant)
errx(1, "short read wanted %zu, got %zd",
nwant, ngot);
ngot = write(fd, buf, nwant);
if (ngot == -1)
err(1, "write of segment %d failed", i);
if ((size_t)ngot != nwant)
errx(1, "short write");
nleft -= nwant;
iorequest.piod_offs += ngot;
}
php++;
}
sbuf_delete(sb);
freemap(map);
}
/*
* A callback for each_dumpable_segment() to write out the segment's
* program header entry.
*/
static void
cb_put_phdr(struct map_entry *entry, void *closure)
{
struct phdr_closure *phc = (struct phdr_closure *)closure;
Elf_Phdr *phdr = phc->phdr;
size_t page_size;
page_size = getpagesize();
phc->offset = roundup2(phc->offset, page_size);
phdr->p_type = PT_LOAD;
phdr->p_offset = phc->offset;
phdr->p_vaddr = entry->start;
phdr->p_paddr = 0;
phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
phdr->p_align = page_size;
phdr->p_flags = 0;
if (entry->protection & VM_PROT_READ)
phdr->p_flags |= PF_R;
if (entry->protection & VM_PROT_WRITE)
phdr->p_flags |= PF_W;
if (entry->protection & VM_PROT_EXECUTE)
phdr->p_flags |= PF_X;
phc->offset += phdr->p_filesz;
phc->phdr++;
}
/*
* A callback for each_dumpable_segment() to gather information about
* the number of segments and their total size.
*/
static void
cb_size_segment(struct map_entry *entry, void *closure)
{
struct sseg_closure *ssc = (struct sseg_closure *)closure;
ssc->count++;
ssc->size += entry->end - entry->start;
}
/*
* For each segment in the given memory map, call the given function
* with a pointer to the map entry and some arbitrary caller-supplied
* data.
*/
static void
each_dumpable_segment(struct map_entry *map, segment_callback func,
void *closure)
{
struct map_entry *entry;
for (entry = map; entry != NULL; entry = entry->next)
(*func)(entry, closure);
}
static void
elf_putnotes(pid_t pid, struct sbuf *sb, size_t *sizep)
{
lwpid_t *tids;
size_t threads, old_len;
ssize_t size;
int i;
errno = 0;
threads = ptrace(PT_GETNUMLWPS, pid, NULL, 0);
if (errno)
err(1, "PT_GETNUMLWPS");
tids = malloc(threads * sizeof(*tids));
if (tids == NULL)
errx(1, "out of memory");
errno = 0;
ptrace(PT_GETLWPLIST, pid, (void *)tids, threads);
if (errno)
err(1, "PT_GETLWPLIST");
sbuf_start_section(sb, &old_len);
elf_putnote(NT_PRPSINFO, elf_note_prpsinfo, &pid, sb);
for (i = 0; i < threads; ++i) {
elf_putregnote(NT_PRSTATUS, tids[i], sb);
elf_putregnote(NT_FPREGSET, tids[i], sb);
elf_putregnote(NT_THRMISC, tids[i], sb);
elf_putregnote(NT_PTLWPINFO, tids[i], sb);
#if defined(__aarch64__) || defined(__arm__)
elf_putregnote(NT_ARM_TLS, tids[i], sb);
#endif
#if (defined(ELFCORE_COMPAT_32) && defined(__aarch64__)) || defined(__arm__)
elf_putregnote(NT_ARM_VFP, tids[i], sb);
#endif
#if defined(__i386__) || defined(__amd64__)
elf_putregnote(NT_X86_SEGBASES, tids[i], sb);
elf_putnote(NT_X86_XSTATE, elf_note_x86_xstate, tids + i, sb);
#endif
#if defined(__powerpc__)
elf_putnote(NT_PPC_VMX, elf_note_powerpc_vmx, tids + i, sb);
#ifndef __SPE__
elf_putnote(NT_PPC_VSX, elf_note_powerpc_vsx, tids + i, sb);
#endif
#endif
}
#ifndef ELFCORE_COMPAT_32
elf_putnote(NT_PROCSTAT_PROC, elf_note_procstat_proc, &pid, sb);
elf_putnote(NT_PROCSTAT_FILES, elf_note_procstat_files, &pid, sb);
elf_putnote(NT_PROCSTAT_VMMAP, elf_note_procstat_vmmap, &pid, sb);
elf_putnote(NT_PROCSTAT_GROUPS, elf_note_procstat_groups, &pid, sb);
elf_putnote(NT_PROCSTAT_UMASK, elf_note_procstat_umask, &pid, sb);
elf_putnote(NT_PROCSTAT_RLIMIT, elf_note_procstat_rlimit, &pid, sb);
elf_putnote(NT_PROCSTAT_OSREL, elf_note_procstat_osrel, &pid, sb);
elf_putnote(NT_PROCSTAT_PSSTRINGS, elf_note_procstat_psstrings, &pid,
sb);
elf_putnote(NT_PROCSTAT_AUXV, elf_note_procstat_auxv, &pid, sb);
#endif
size = sbuf_end_section(sb, old_len, 1, 0);
if (size == -1)
err(1, "sbuf_end_section");
free(tids);
*sizep = size;
}
/*
* Emit one register set note section to sbuf.
*/
static void
elf_putregnote(int type, lwpid_t tid, struct sbuf *sb)
{
Elf_Note note;
struct iovec iov;
ssize_t old_len;
iov.iov_base = NULL;
iov.iov_len = 0;
if (ptrace(PT_GETREGSET, tid, (void *)&iov, type) != 0)
return;
iov.iov_base = calloc(1, iov.iov_len);
if (iov.iov_base == NULL)
errx(1, "out of memory");
if (ptrace(PT_GETREGSET, tid, (void *)&iov, type) != 0)
errx(1, "failed to fetch register set %d", type);
note.n_namesz = 8; /* strlen("FreeBSD") + 1 */
note.n_descsz = iov.iov_len;
note.n_type = type;
sbuf_bcat(sb, &note, sizeof(note));
sbuf_start_section(sb, &old_len);
sbuf_bcat(sb, "FreeBSD", note.n_namesz);
sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
sbuf_start_section(sb, &old_len);
sbuf_bcat(sb, iov.iov_base, iov.iov_len);
sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
free(iov.iov_base);
}
/*
* Emit one note section to sbuf.
*/
static void
elf_putnote(int type, notefunc_t notefunc, void *arg, struct sbuf *sb)
{
Elf_Note note;
size_t descsz;
ssize_t old_len;
void *desc;
desc = notefunc(arg, &descsz);
note.n_namesz = 8; /* strlen("FreeBSD") + 1 */
note.n_descsz = descsz;
note.n_type = type;
sbuf_bcat(sb, &note, sizeof(note));
sbuf_start_section(sb, &old_len);
sbuf_bcat(sb, "FreeBSD", note.n_namesz);
sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
if (descsz == 0)
return;
sbuf_start_section(sb, &old_len);
sbuf_bcat(sb, desc, descsz);
sbuf_end_section(sb, old_len, sizeof(Elf32_Size), 0);
free(desc);
}
/*
* Generate the ELF coredump header.
*/
static void
elf_puthdr(int efd, pid_t pid, struct map_entry *map, void *hdr, size_t hdrsize,
size_t notesz, size_t segoff, int numsegs)
{
Elf_Ehdr *ehdr, binhdr;
Elf_Phdr *phdr;
Elf_Shdr *shdr;
struct phdr_closure phc;
ssize_t cnt;
cnt = read(efd, &binhdr, sizeof(binhdr));
if (cnt < 0)
err(1, "Failed to re-read ELF header");
else if (cnt != sizeof(binhdr))
errx(1, "Failed to re-read ELF header");
ehdr = (Elf_Ehdr *)hdr;
ehdr->e_ident[EI_MAG0] = ELFMAG0;
ehdr->e_ident[EI_MAG1] = ELFMAG1;
ehdr->e_ident[EI_MAG2] = ELFMAG2;
ehdr->e_ident[EI_MAG3] = ELFMAG3;
ehdr->e_ident[EI_CLASS] = ELF_CLASS;
ehdr->e_ident[EI_DATA] = ELF_DATA;
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
ehdr->e_ident[EI_ABIVERSION] = 0;
ehdr->e_ident[EI_PAD] = 0;
ehdr->e_type = ET_CORE;
ehdr->e_machine = binhdr.e_machine;
ehdr->e_version = EV_CURRENT;
ehdr->e_entry = 0;
ehdr->e_phoff = sizeof(Elf_Ehdr);
ehdr->e_flags = binhdr.e_flags;
ehdr->e_ehsize = sizeof(Elf_Ehdr);
ehdr->e_phentsize = sizeof(Elf_Phdr);
ehdr->e_shentsize = sizeof(Elf_Shdr);
ehdr->e_shstrndx = SHN_UNDEF;
if (numsegs + 1 < PN_XNUM) {
ehdr->e_phnum = numsegs + 1;
ehdr->e_shnum = 0;
} else {
ehdr->e_phnum = PN_XNUM;
ehdr->e_shnum = 1;
ehdr->e_shoff = ehdr->e_phoff +
(numsegs + 1) * ehdr->e_phentsize;
shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff);
memset(shdr, 0, sizeof(*shdr));
/*
* A special first section is used to hold large segment and
* section counts. This was proposed by Sun Microsystems in
* Solaris and has been adopted by Linux; the standard ELF
* tools are already familiar with the technique.
*
* See table 7-7 of the Solaris "Linker and Libraries Guide"
* (or 12-7 depending on the version of the document) for more
* details.
*/
shdr->sh_type = SHT_NULL;
shdr->sh_size = ehdr->e_shnum;
shdr->sh_link = ehdr->e_shstrndx;
shdr->sh_info = numsegs + 1;
}
/*
* Fill in the program header entries.
*/
phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff);
/* The note segment. */
phdr->p_type = PT_NOTE;
phdr->p_offset = hdrsize;
phdr->p_vaddr = 0;
phdr->p_paddr = 0;
phdr->p_filesz = notesz;
phdr->p_memsz = 0;
phdr->p_flags = PF_R;
phdr->p_align = sizeof(Elf32_Size);
phdr++;
/* All the writable segments from the program. */
phc.phdr = phdr;
phc.offset = segoff;
each_dumpable_segment(map, cb_put_phdr, &phc);
}
/*
* Free the memory map.
*/
static void
freemap(struct map_entry *map)
{
struct map_entry *next;
while (map != NULL) {
next = map->next;
free(map);
map = next;
}
}
/*
* Read the process's memory map using kinfo_getvmmap(), and return a list of
* VM map entries. Only the non-device read/writable segments are
* returned. The map entries in the list aren't fully filled in; only
* the items we need are present.
*/
static struct map_entry *
readmap(pid_t pid)
{
struct map_entry *ent, **linkp, *map;
struct kinfo_vmentry *vmentl, *kve;
int i, nitems;
vmentl = kinfo_getvmmap(pid, &nitems);
if (vmentl == NULL)
err(1, "cannot retrieve mappings for %u process", pid);
map = NULL;
linkp = &map;
for (i = 0; i < nitems; i++) {
kve = &vmentl[i];
/*
* Ignore 'malformed' segments or ones representing memory
* mapping with MAP_NOCORE on.
* If the 'full' support is disabled, just dump the most
* meaningful data segments.
*/
if ((kve->kve_protection & KVME_PROT_READ) == 0 ||
(kve->kve_flags & KVME_FLAG_NOCOREDUMP) != 0 ||
kve->kve_type == KVME_TYPE_DEAD ||
kve->kve_type == KVME_TYPE_UNKNOWN ||
((pflags & PFLAGS_FULL) == 0 &&
kve->kve_type != KVME_TYPE_DEFAULT &&
kve->kve_type != KVME_TYPE_VNODE &&
kve->kve_type != KVME_TYPE_SWAP &&
kve->kve_type != KVME_TYPE_PHYS))
continue;
ent = calloc(1, sizeof(*ent));
if (ent == NULL)
errx(1, "out of memory");
ent->start = (vm_offset_t)kve->kve_start;
ent->end = (vm_offset_t)kve->kve_end;
ent->protection = VM_PROT_READ;
if ((kve->kve_protection & KVME_PROT_WRITE) != 0)
ent->protection |= VM_PROT_WRITE;
if ((kve->kve_protection & KVME_PROT_EXEC) != 0)
ent->protection |= VM_PROT_EXECUTE;
*linkp = ent;
linkp = &ent->next;
}
free(vmentl);
return (map);
}
/*
* Miscellaneous note out functions.
*/
static void *
elf_note_prpsinfo(void *arg, size_t *sizep)
{
char *cp, *end;
pid_t pid;
elfcore_prpsinfo_t *psinfo;
struct kinfo_proc kip;
size_t len;
int name[4];
pid = *(pid_t *)arg;
psinfo = calloc(1, sizeof(*psinfo));
if (psinfo == NULL)
errx(1, "out of memory");
psinfo->pr_version = PRPSINFO_VERSION;
psinfo->pr_psinfosz = sizeof(*psinfo);
name[0] = CTL_KERN;
name[1] = KERN_PROC;
name[2] = KERN_PROC_PID;
name[3] = pid;
len = sizeof(kip);
if (sysctl(name, 4, &kip, &len, NULL, 0) == -1)
err(1, "kern.proc.pid.%u", pid);
if (kip.ki_pid != pid)
err(1, "kern.proc.pid.%u", pid);
strlcpy(psinfo->pr_fname, kip.ki_comm, sizeof(psinfo->pr_fname));
name[2] = KERN_PROC_ARGS;
len = sizeof(psinfo->pr_psargs) - 1;
if (sysctl(name, 4, psinfo->pr_psargs, &len, NULL, 0) == 0 && len > 0) {
cp = psinfo->pr_psargs;
end = cp + len - 1;
for (;;) {
cp = memchr(cp, '\0', end - cp);
if (cp == NULL)
break;
*cp = ' ';
}
} else
strlcpy(psinfo->pr_psargs, kip.ki_comm,
sizeof(psinfo->pr_psargs));
psinfo->pr_pid = pid;
*sizep = sizeof(*psinfo);
return (psinfo);
}
#if defined(__i386__) || defined(__amd64__)
static void *
elf_note_x86_xstate(void *arg, size_t *sizep)
{
lwpid_t tid;
char *xstate;
static bool xsave_checked = false;
static struct ptrace_xstate_info info;
tid = *(lwpid_t *)arg;
if (!xsave_checked) {
if (ptrace(PT_GETXSTATE_INFO, tid, (void *)&info,
sizeof(info)) != 0)
info.xsave_len = 0;
xsave_checked = true;
}
if (info.xsave_len == 0) {
*sizep = 0;
return (NULL);
}
xstate = calloc(1, info.xsave_len);
ptrace(PT_GETXSTATE, tid, xstate, 0);
*(uint64_t *)(xstate + X86_XSTATE_XCR0_OFFSET) = info.xsave_mask;
*sizep = info.xsave_len;
return (xstate);
}
#endif
#if defined(__powerpc__)
static void *
elf_note_powerpc_vmx(void *arg, size_t *sizep)
{
lwpid_t tid;
struct vmxreg *vmx;
static bool has_vmx = true;
struct vmxreg info;
tid = *(lwpid_t *)arg;
if (has_vmx) {
if (ptrace(PT_GETVRREGS, tid, (void *)&info,
sizeof(info)) != 0)
has_vmx = false;
}
if (!has_vmx) {
*sizep = 0;
return (NULL);
}
vmx = calloc(1, sizeof(*vmx));
memcpy(vmx, &info, sizeof(*vmx));
*sizep = sizeof(*vmx);
return (vmx);
}
static void *
elf_note_powerpc_vsx(void *arg, size_t *sizep)
{
lwpid_t tid;
char *vshr_data;
static bool has_vsx = true;
uint64_t vshr[32];
tid = *(lwpid_t *)arg;
if (has_vsx) {
if (ptrace(PT_GETVSRREGS, tid, (void *)vshr,
sizeof(vshr)) != 0)
has_vsx = false;
}
if (!has_vsx) {
*sizep = 0;
return (NULL);
}
vshr_data = calloc(1, sizeof(vshr));
memcpy(vshr_data, vshr, sizeof(vshr));
*sizep = sizeof(vshr);
return (vshr_data);
}
#endif
static void *
procstat_sysctl(void *arg, int what, size_t structsz, size_t *sizep)
{
size_t len;
pid_t pid;
int name[4], structsize;
void *buf, *p;
pid = *(pid_t *)arg;
structsize = structsz;
name[0] = CTL_KERN;
name[1] = KERN_PROC;
name[2] = what;
name[3] = pid;
len = 0;
if (sysctl(name, 4, NULL, &len, NULL, 0) == -1)
err(1, "kern.proc.%d.%u", what, pid);
buf = calloc(1, sizeof(structsize) + len * 4 / 3);
if (buf == NULL)
errx(1, "out of memory");
bcopy(&structsize, buf, sizeof(structsize));
p = (char *)buf + sizeof(structsize);
if (sysctl(name, 4, p, &len, NULL, 0) == -1)
err(1, "kern.proc.%d.%u", what, pid);
*sizep = sizeof(structsize) + len;
return (buf);
}
static void *
elf_note_procstat_proc(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_PID | KERN_PROC_INC_THREAD,
sizeof(struct kinfo_proc), sizep));
}
static void *
elf_note_procstat_files(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_FILEDESC,
sizeof(struct kinfo_file), sizep));
}
static void *
elf_note_procstat_vmmap(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_VMMAP,
sizeof(struct kinfo_vmentry), sizep));
}
static void *
elf_note_procstat_groups(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep));
}
static void *
elf_note_procstat_umask(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_UMASK, sizeof(u_short), sizep));
}
static void *
elf_note_procstat_osrel(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_OSREL, sizeof(int), sizep));
}
static void *
elf_note_procstat_psstrings(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_PS_STRINGS,
sizeof(vm_offset_t), sizep));
}
static void *
elf_note_procstat_auxv(void *arg, size_t *sizep)
{
return (procstat_sysctl(arg, KERN_PROC_AUXV,
sizeof(Elf_Auxinfo), sizep));
}
static void *
elf_note_procstat_rlimit(void *arg, size_t *sizep)
{
pid_t pid;
size_t len;
int i, name[5], structsize;
void *buf, *p;
pid = *(pid_t *)arg;
structsize = sizeof(struct rlimit) * RLIM_NLIMITS;
buf = calloc(1, sizeof(structsize) + structsize);
if (buf == NULL)
errx(1, "out of memory");
bcopy(&structsize, buf, sizeof(structsize));
p = (char *)buf + sizeof(structsize);
name[0] = CTL_KERN;
name[1] = KERN_PROC;
name[2] = KERN_PROC_RLIMIT;
name[3] = pid;
len = sizeof(struct rlimit);
for (i = 0; i < RLIM_NLIMITS; i++) {
name[4] = i;
if (sysctl(name, 5, p, &len, NULL, 0) == -1)
err(1, "kern.proc.rlimit.%u", pid);
if (len != sizeof(struct rlimit))
errx(1, "kern.proc.rlimit.%u: short read", pid);
p += len;
}
*sizep = sizeof(structsize) + structsize;
return (buf);
}
struct dumpers __elfN(dump) = { elf_ident, elf_coredump };
TEXT_SET(dumpset, __elfN(dump));