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netdump.c
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/* netdump.c
*
* Copyright (C) 2002-2019 David Anderson
* Copyright (C) 2002-2019 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Author: David Anderson
*/
#define _LARGEFILE64_SOURCE 1 /* stat64() */
#include "defs.h"
#include "netdump.h"
#include "sadump.h"
#include "xen_dom0.h"
static struct vmcore_data vmcore_data = { 0 };
static struct vmcore_data *nd = &vmcore_data;
static struct proc_kcore_data proc_kcore_data = { 0 };
static struct proc_kcore_data *pkd = &proc_kcore_data;
static void netdump_print(char *, ...);
static size_t resize_elf_header(int, char *, char **, char **, ulong);
static void dump_Elf32_Ehdr(Elf32_Ehdr *);
static void dump_Elf32_Phdr(Elf32_Phdr *, int);
static size_t dump_Elf32_Nhdr(Elf32_Off offset, int);
static void dump_Elf64_Ehdr(Elf64_Ehdr *);
static void dump_Elf64_Phdr(Elf64_Phdr *, int);
static void dump_Elf64_Shdr(Elf64_Shdr *shdr);
static size_t dump_Elf64_Nhdr(Elf64_Off offset, int);
static void get_netdump_regs_32(struct bt_info *, ulong *, ulong *);
static void get_netdump_regs_ppc(struct bt_info *, ulong *, ulong *);
static void get_netdump_regs_ppc64(struct bt_info *, ulong *, ulong *);
static void get_netdump_regs_arm(struct bt_info *, ulong *, ulong *);
static void get_netdump_regs_arm64(struct bt_info *, ulong *, ulong *);
static void get_netdump_regs_mips(struct bt_info *, ulong *, ulong *);
static void check_dumpfile_size(char *);
static int proc_kcore_init_32(FILE *, int);
static int proc_kcore_init_64(FILE *, int);
static char *get_regs_from_note(char *, ulong *, ulong *);
static void kdump_get_osrelease(void);
static char *vmcoreinfo_read_string(const char *);
#define ELFSTORE 1
#define ELFREAD 0
#define MIN_PAGE_SIZE (4096)
/*
* Architectures that have configurable page sizes,
* can differ from the host machine's page size.
*/
#define READ_PAGESIZE_FROM_VMCOREINFO() \
(machine_type("IA64") || machine_type("PPC64") || machine_type("PPC") || machine_type("ARM64"))
/*
* kdump installs NT_PRSTATUS elf notes only to the cpus
* that were online during dumping. Hence we call into
* this function after reading the cpu map from the kernel,
* to remap the NT_PRSTATUS notes only to the online cpus.
*/
void
map_cpus_to_prstatus(void)
{
void **nt_ptr;
int online, i, j, nrcpus;
size_t size;
if (pc->flags2 & QEMU_MEM_DUMP_ELF) /* notes exist for all cpus */
return;
if (!(online = get_cpus_online()) || (online == kt->cpus))
return;
if (CRASHDEBUG(1))
error(INFO,
"cpus: %d online: %d NT_PRSTATUS notes: %d (remapping)\n",
kt->cpus, online, nd->num_prstatus_notes);
size = NR_CPUS * sizeof(void *);
nt_ptr = (void **)GETBUF(size);
BCOPY(nd->nt_prstatus_percpu, nt_ptr, size);
BZERO(nd->nt_prstatus_percpu, size);
/*
* Re-populate the array with the notes mapping to online cpus
*/
nrcpus = (kt->kernel_NR_CPUS ? kt->kernel_NR_CPUS : NR_CPUS);
for (i = 0, j = 0; i < nrcpus; i++) {
if (in_cpu_map(ONLINE_MAP, i))
nd->nt_prstatus_percpu[i] = nt_ptr[j++];
}
FREEBUF(nt_ptr);
}
/*
* Determine whether a file is a netdump/diskdump/kdump creation,
* and if TRUE, initialize the vmcore_data structure.
*/
int
is_netdump(char *file, ulong source_query)
{
int i, fd, swap;
Elf32_Ehdr *elf32;
Elf32_Phdr *load32;
Elf64_Ehdr *elf64;
Elf64_Phdr *load64;
char *eheader, *sect0;
char buf[BUFSIZE];
size_t size, len, tot;
Elf32_Off offset32;
Elf64_Off offset64;
ulong format;
if ((fd = open(file, O_RDWR)) < 0) {
if ((fd = open(file, O_RDONLY)) < 0) {
sprintf(buf, "%s: open", file);
perror(buf);
return FALSE;
}
}
size = MIN_NETDUMP_ELF_HEADER_SIZE;
if ((eheader = (char *)malloc(size)) == NULL) {
fprintf(stderr, "cannot malloc minimum ELF header buffer\n");
clean_exit(1);
}
if (FLAT_FORMAT()) {
if (!read_flattened_format(fd, 0, eheader, size))
goto bailout;
} else {
if (read(fd, eheader, size) != size) {
sprintf(buf, "%s: ELF header read", file);
perror(buf);
goto bailout;
}
}
load32 = NULL;
load64 = NULL;
format = 0;
elf32 = (Elf32_Ehdr *)&eheader[0];
elf64 = (Elf64_Ehdr *)&eheader[0];
/*
* Verify the ELF header, and determine the dumpfile format.
*
* For now, kdump vmcores differ from netdump/diskdump like so:
*
* 1. The first kdump PT_LOAD segment is packed just after
* the ELF header, whereas netdump/diskdump page-align
* the first PT_LOAD segment.
* 2. Each kdump PT_LOAD segment has a p_align field of zero,
* whereas netdump/diskdump have their p_align fields set
* to the system page-size.
*
* If either kdump difference is seen, presume kdump -- this
* is obviously subject to change.
*/
if (!STRNEQ(eheader, ELFMAG) || eheader[EI_VERSION] != EV_CURRENT)
goto bailout;
swap = (((eheader[EI_DATA] == ELFDATA2LSB) &&
(__BYTE_ORDER == __BIG_ENDIAN)) ||
((eheader[EI_DATA] == ELFDATA2MSB) &&
(__BYTE_ORDER == __LITTLE_ENDIAN)));
if ((elf32->e_ident[EI_CLASS] == ELFCLASS32) &&
(swap16(elf32->e_type, swap) == ET_CORE) &&
(swap32(elf32->e_version, swap) == EV_CURRENT) &&
(swap16(elf32->e_phnum, swap) >= 2)) {
switch (swap16(elf32->e_machine, swap))
{
case EM_386:
if (machine_type_mismatch(file, "X86", NULL,
source_query))
goto bailout;
break;
case EM_ARM:
if (machine_type_mismatch(file, "ARM", NULL,
source_query))
goto bailout;
break;
case EM_PPC:
if (machine_type_mismatch(file, "PPC", NULL,
source_query))
goto bailout;
break;
case EM_MIPS:
if (machine_type_mismatch(file, "MIPS", NULL,
source_query))
goto bailout;
break;
default:
if (machine_type_mismatch(file, "(unknown)", NULL,
source_query))
goto bailout;
}
if (endian_mismatch(file, elf32->e_ident[EI_DATA],
source_query))
goto bailout;
load32 = (Elf32_Phdr *)
&eheader[sizeof(Elf32_Ehdr)+sizeof(Elf32_Phdr)];
if ((load32->p_offset & (MIN_PAGE_SIZE-1)) ||
(load32->p_align == 0))
format = KDUMP_ELF32;
else
format = NETDUMP_ELF32;
} else if ((elf64->e_ident[EI_CLASS] == ELFCLASS64) &&
(swap16(elf64->e_type, swap) == ET_CORE) &&
(swap32(elf64->e_version, swap) == EV_CURRENT) &&
(swap16(elf64->e_phnum, swap) >= 2)) {
switch (swap16(elf64->e_machine, swap))
{
case EM_IA_64:
if (machine_type_mismatch(file, "IA64", NULL,
source_query))
goto bailout;
break;
case EM_PPC64:
if (machine_type_mismatch(file, "PPC64", NULL,
source_query))
goto bailout;
break;
case EM_X86_64:
if (machine_type_mismatch(file, "X86_64", NULL,
source_query))
goto bailout;
break;
case EM_S390:
if (machine_type_mismatch(file, "S390X", NULL,
source_query))
goto bailout;
break;
case EM_386:
if (machine_type_mismatch(file, "X86", NULL,
source_query))
goto bailout;
break;
case EM_ARM:
if (machine_type_mismatch(file, "ARM", NULL,
source_query))
goto bailout;
break;
case EM_AARCH64:
if (machine_type_mismatch(file, "ARM64", NULL,
source_query))
goto bailout;
break;
case EM_MIPS:
if (machine_type_mismatch(file, "MIPS", NULL,
source_query))
goto bailout;
break;
default:
if (machine_type_mismatch(file, "(unknown)", NULL,
source_query))
goto bailout;
}
if (endian_mismatch(file, elf64->e_ident[EI_DATA],
source_query))
goto bailout;
load64 = (Elf64_Phdr *)
&eheader[sizeof(Elf64_Ehdr)+sizeof(Elf64_Phdr)];
if ((load64->p_offset & (MIN_PAGE_SIZE-1)) ||
(load64->p_align == 0))
format = KDUMP_ELF64;
else
format = NETDUMP_ELF64;
} else {
if (CRASHDEBUG(2))
error(INFO, "%s: not a %s ELF dumpfile\n",
file, source_query == NETDUMP_LOCAL ?
"netdump" : "kdump");
goto bailout;
}
if (source_query == KCORE_LOCAL) {
close(fd);
return TRUE;
}
switch (format)
{
case NETDUMP_ELF32:
case NETDUMP_ELF64:
if (source_query & (NETDUMP_LOCAL|NETDUMP_REMOTE))
break;
else
goto bailout;
case KDUMP_ELF32:
case KDUMP_ELF64:
if (source_query & KDUMP_LOCAL)
break;
else
goto bailout;
}
sect0 = NULL;
if (!(size = resize_elf_header(fd, file, &eheader, §0, format)))
goto bailout;
nd->ndfd = fd;
nd->elf_header = eheader;
nd->flags = format | source_query;
switch (format)
{
case NETDUMP_ELF32:
case KDUMP_ELF32:
nd->header_size = size;
nd->elf32 = (Elf32_Ehdr *)&nd->elf_header[0];
nd->num_pt_load_segments = nd->elf32->e_phnum - 1;
if ((nd->pt_load_segments = (struct pt_load_segment *)
malloc(sizeof(struct pt_load_segment) *
nd->num_pt_load_segments)) == NULL) {
fprintf(stderr, "cannot malloc PT_LOAD segment buffers\n");
clean_exit(1);
}
nd->notes32 = (Elf32_Phdr *)
&nd->elf_header[sizeof(Elf32_Ehdr)];
nd->load32 = (Elf32_Phdr *)
&nd->elf_header[sizeof(Elf32_Ehdr)+sizeof(Elf32_Phdr)];
if (format == NETDUMP_ELF32)
nd->page_size = (uint)nd->load32->p_align;
dump_Elf32_Ehdr(nd->elf32);
dump_Elf32_Phdr(nd->notes32, ELFREAD);
for (i = 0; i < nd->num_pt_load_segments; i++)
dump_Elf32_Phdr(nd->load32 + i, ELFSTORE+i);
offset32 = nd->notes32->p_offset;
for (tot = 0; tot < nd->notes32->p_filesz; tot += len) {
if (!(len = dump_Elf32_Nhdr(offset32, ELFSTORE)))
break;
offset32 += len;
}
break;
case NETDUMP_ELF64:
case KDUMP_ELF64:
nd->header_size = size;
nd->elf64 = (Elf64_Ehdr *)&nd->elf_header[0];
/*
* Extended Numbering support
* See include/uapi/linux/elf.h and elf(5) for more information
*/
if (nd->elf64->e_phnum == PN_XNUM) {
nd->sect0_64 = (Elf64_Shdr *)sect0;
nd->num_pt_load_segments = nd->sect0_64->sh_info - 1;
} else
nd->num_pt_load_segments = nd->elf64->e_phnum - 1;
if ((nd->pt_load_segments = (struct pt_load_segment *)
malloc(sizeof(struct pt_load_segment) *
nd->num_pt_load_segments)) == NULL) {
fprintf(stderr, "cannot malloc PT_LOAD segment buffers\n");
clean_exit(1);
}
nd->notes64 = (Elf64_Phdr *)
&nd->elf_header[sizeof(Elf64_Ehdr)];
nd->load64 = (Elf64_Phdr *)
&nd->elf_header[sizeof(Elf64_Ehdr)+sizeof(Elf64_Phdr)];
if (format == NETDUMP_ELF64)
nd->page_size = (uint)nd->load64->p_align;
dump_Elf64_Ehdr(nd->elf64);
dump_Elf64_Phdr(nd->notes64, ELFREAD);
for (i = 0; i < nd->num_pt_load_segments; i++)
dump_Elf64_Phdr(nd->load64 + i, ELFSTORE+i);
offset64 = nd->notes64->p_offset;
for (tot = 0; tot < nd->notes64->p_filesz; tot += len) {
if (!(len = dump_Elf64_Nhdr(offset64, ELFSTORE)))
break;
offset64 += len;
}
break;
}
if (CRASHDEBUG(1))
netdump_memory_dump(fp);
pc->read_vmcoreinfo = vmcoreinfo_read_string;
if ((source_query == KDUMP_LOCAL) &&
(pc->flags2 & GET_OSRELEASE))
kdump_get_osrelease();
if ((source_query == KDUMP_LOCAL) &&
(pc->flags2 & GET_LOG)) {
pc->dfd = nd->ndfd;
pc->readmem = read_kdump;
nd->flags |= KDUMP_LOCAL;
pc->flags |= KDUMP;
get_log_from_vmcoreinfo(file);
}
return nd->header_size;
bailout:
close(fd);
free(eheader);
return FALSE;
}
/*
* Search through all PT_LOAD segments to determine the
* file offset where the physical memory segment(s) start
* in the vmcore, and consider everything prior to that as
* header contents.
*/
static size_t
resize_elf_header(int fd, char *file, char **eheader_ptr, char **sect0_ptr,
ulong format)
{
int i;
char buf[BUFSIZE];
char *eheader;
Elf32_Ehdr *elf32;
Elf32_Phdr *load32;
Elf64_Ehdr *elf64;
Elf64_Phdr *load64;
Elf32_Off p_offset32;
Elf64_Off p_offset64;
size_t header_size;
uint num_pt_load_segments;
eheader = *eheader_ptr;
header_size = num_pt_load_segments = 0;
elf32 = (Elf32_Ehdr *)&eheader[0];
elf64 = (Elf64_Ehdr *)&eheader[0];
switch (format)
{
case NETDUMP_ELF32:
case KDUMP_ELF32:
num_pt_load_segments = elf32->e_phnum - 1;
header_size = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) +
(sizeof(Elf32_Phdr) * num_pt_load_segments);
break;
case NETDUMP_ELF64:
case KDUMP_ELF64:
/*
* Extended Numbering support
* See include/uapi/linux/elf.h and elf(5) for more information
*/
if (elf64->e_phnum == PN_XNUM) {
Elf64_Shdr *shdr64;
shdr64 = (Elf64_Shdr *)malloc(sizeof(*shdr64));
if (!shdr64) {
fprintf(stderr,
"cannot malloc a section header buffer\n");
return 0;
}
if (FLAT_FORMAT()) {
if (!read_flattened_format(fd, elf64->e_shoff,
shdr64, elf64->e_shentsize))
return 0;
} else {
if (lseek(fd, elf64->e_shoff, SEEK_SET) !=
elf64->e_shoff) {
sprintf(buf, "%s: section header lseek",
file);
perror(buf);
return 0;
}
if (read(fd, shdr64, elf64->e_shentsize) !=
elf64->e_shentsize) {
sprintf(buf, "%s: section header read",
file);
perror(buf);
return 0;
}
}
num_pt_load_segments = shdr64->sh_info - 1;
*sect0_ptr = (char *)shdr64;
} else
num_pt_load_segments = elf64->e_phnum - 1;
header_size = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) +
(sizeof(Elf64_Phdr) * num_pt_load_segments);
break;
}
if ((eheader = (char *)realloc(eheader, header_size)) == NULL) {
fprintf(stderr, "cannot realloc interim ELF header buffer\n");
clean_exit(1);
} else
*eheader_ptr = eheader;
if (FLAT_FORMAT()) {
if (!read_flattened_format(fd, 0, eheader, header_size))
return 0;
} else {
if (lseek(fd, 0, SEEK_SET) != 0) {
sprintf(buf, "%s: lseek", file);
perror(buf);
return 0;
}
if (read(fd, eheader, header_size) != header_size) {
sprintf(buf, "%s: ELF header read", file);
perror(buf);
return 0;
}
}
switch (format)
{
case NETDUMP_ELF32:
case KDUMP_ELF32:
load32 = (Elf32_Phdr *)&eheader[sizeof(Elf32_Ehdr)+sizeof(Elf32_Phdr)];
p_offset32 = load32->p_offset;
for (i = 0; i < num_pt_load_segments; i++, load32 += 1) {
if (load32->p_offset &&
(p_offset32 > load32->p_offset))
p_offset32 = load32->p_offset;
}
header_size = (size_t)p_offset32;
break;
case NETDUMP_ELF64:
case KDUMP_ELF64:
load64 = (Elf64_Phdr *)&eheader[sizeof(Elf64_Ehdr)+sizeof(Elf64_Phdr)];
p_offset64 = load64->p_offset;
for (i = 0; i < num_pt_load_segments; i++, load64 += 1) {
if (load64->p_offset &&
(p_offset64 > load64->p_offset))
p_offset64 = load64->p_offset;
}
header_size = (size_t)p_offset64;
break;
}
if ((eheader = (char *)realloc(eheader, header_size)) == NULL) {
perror("realloc");
fprintf(stderr, "cannot realloc resized ELF header buffer\n");
clean_exit(1);
} else
*eheader_ptr = eheader;
if (FLAT_FORMAT()) {
if (!read_flattened_format(fd, 0, eheader, header_size))
return 0;
} else {
if (lseek(fd, 0, SEEK_SET) != 0) {
sprintf(buf, "%s: lseek", file);
perror(buf);
return 0;
}
if (read(fd, eheader, header_size) != header_size) {
sprintf(buf, "%s: ELF header read", file);
perror(buf);
return 0;
}
}
return header_size;
}
/*
* Return the e_version number of an ELF file
* (or -1 if its not readable ELF file)
*/
int
file_elf_version(char *file)
{
int fd, size;
Elf32_Ehdr *elf32;
Elf64_Ehdr *elf64;
char header[MIN_NETDUMP_ELF_HEADER_SIZE];
char buf[BUFSIZE];
if ((fd = open(file, O_RDONLY)) < 0) {
sprintf(buf, "%s: open", file);
perror(buf);
return -1;
}
size = MIN_NETDUMP_ELF_HEADER_SIZE;
if (read(fd, header, size) != size) {
sprintf(buf, "%s: read", file);
perror(buf);
close(fd);
return -1;
}
close(fd);
elf32 = (Elf32_Ehdr *)&header[0];
elf64 = (Elf64_Ehdr *)&header[0];
if (STRNEQ(elf32->e_ident, ELFMAG) &&
(elf32->e_ident[EI_CLASS] == ELFCLASS32) &&
(elf32->e_ident[EI_DATA] == ELFDATA2LSB) &&
(elf32->e_ident[EI_VERSION] == EV_CURRENT)) {
return (elf32->e_version);
} else if (STRNEQ(elf64->e_ident, ELFMAG) &&
(elf64->e_ident[EI_CLASS] == ELFCLASS64) &&
(elf64->e_ident[EI_VERSION] == EV_CURRENT)) {
return (elf64->e_version);
}
return -1;
}
/*
* Check whether any PT_LOAD segment goes beyond the file size.
*/
static void
check_dumpfile_size(char *file)
{
int i;
struct stat64 stat;
struct pt_load_segment *pls;
uint64_t segment_end;
if (is_ramdump_image())
return;
if (stat64(file, &stat) < 0)
return;
if (S_ISBLK(stat.st_mode)) {
error(NOTE, "%s: No dump complete check for block devices\n",
file);
return;
}
for (i = 0; i < nd->num_pt_load_segments; i++) {
pls = &nd->pt_load_segments[i];
segment_end = pls->file_offset +
(pls->phys_end - pls->phys_start);
if (segment_end > stat.st_size) {
error(WARNING, "%s: may be truncated or incomplete\n"
" PT_LOAD p_offset: %lld\n"
" p_filesz: %lld\n"
" bytes required: %lld\n"
" dumpfile size: %lld\n\n",
file, pls->file_offset,
pls->phys_end - pls->phys_start,
segment_end, stat.st_size);
return;
}
}
}
/*
* Perform any post-dumpfile determination stuff here.
*/
int
netdump_init(char *unused, FILE *fptr)
{
if (!VMCORE_VALID())
return FALSE;
nd->ofp = fptr;
check_dumpfile_size(pc->dumpfile);
return TRUE;
}
/*
* Read from a netdump-created dumpfile.
*/
int
read_netdump(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
off_t offset;
ssize_t read_ret;
struct pt_load_segment *pls;
int i;
offset = 0;
/*
* The Elf32_Phdr has 32-bit fields for p_paddr, p_filesz and
* p_memsz, so for now, multiple PT_LOAD segment support is
* restricted to 64-bit machines for netdump/diskdump vmcores.
* However, kexec/kdump has introduced the optional use of a
* 64-bit ELF header for 32-bit processors.
*/
switch (DUMPFILE_FORMAT(nd->flags))
{
case NETDUMP_ELF32:
offset = (off_t)paddr + (off_t)nd->header_size;
break;
case NETDUMP_ELF64:
case KDUMP_ELF32:
case KDUMP_ELF64:
if (nd->num_pt_load_segments == 1) {
offset = (off_t)paddr + (off_t)nd->header_size -
(off_t)nd->pt_load_segments[0].phys_start;
break;
}
for (i = offset = 0; i < nd->num_pt_load_segments; i++) {
pls = &nd->pt_load_segments[i];
if ((paddr >= pls->phys_start) &&
(paddr < pls->phys_end)) {
offset = (off_t)(paddr - pls->phys_start) +
pls->file_offset;
break;
}
if (pls->zero_fill && (paddr >= pls->phys_end) &&
(paddr < pls->zero_fill)) {
memset(bufptr, 0, cnt);
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: zero-fill: "
"addr: %lx paddr: %llx cnt: %d\n",
addr, (ulonglong)paddr, cnt);
return cnt;
}
}
if (!offset) {
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: READ_ERROR: "
"offset not found for paddr: %llx\n",
(ulonglong)paddr);
return READ_ERROR;
}
break;
}
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: addr: %lx paddr: %llx cnt: %d offset: %llx\n",
addr, (ulonglong)paddr, cnt, (ulonglong)offset);
if (FLAT_FORMAT()) {
if (!read_flattened_format(nd->ndfd, offset, bufptr, cnt)) {
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: READ_ERROR: "
"read_flattened_format failed for offset:"
" %llx\n",
(ulonglong)offset);
return READ_ERROR;
}
} else {
if (lseek(nd->ndfd, offset, SEEK_SET) == -1) {
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: SEEK_ERROR: "
"offset: %llx\n", (ulonglong)offset);
return SEEK_ERROR;
}
read_ret = read(nd->ndfd, bufptr, cnt);
if (read_ret != cnt) {
/*
* If the incomplete flag has been set in the header,
* first check whether zero_excluded has been set.
*/
if (is_incomplete_dump() && (read_ret >= 0) &&
(*diskdump_flags & ZERO_EXCLUDED)) {
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: zero-fill: "
"addr: %lx paddr: %llx cnt: %d\n",
addr + read_ret,
(ulonglong)paddr + read_ret,
cnt - (int)read_ret);
bufptr += read_ret;
bzero(bufptr, cnt - read_ret);
return cnt;
}
if (CRASHDEBUG(8))
fprintf(fp, "read_netdump: READ_ERROR: "
"offset: %llx\n", (ulonglong)offset);
return READ_ERROR;
}
}
return cnt;
}
/*
* Write to a netdump-created dumpfile. Note that cmd_wr() does not
* allow writes to dumpfiles, so you can't get here from there.
* But, if it would ever be helpful, here it is...
*/
int
write_netdump(int fd, void *bufptr, int cnt, ulong addr, physaddr_t paddr)
{
off_t offset;
struct pt_load_segment *pls;
int i;
offset = 0;
switch (DUMPFILE_FORMAT(nd->flags))
{
case NETDUMP_ELF32:
offset = (off_t)paddr + (off_t)nd->header_size;
break;
case NETDUMP_ELF64:
case KDUMP_ELF32:
case KDUMP_ELF64:
if (nd->num_pt_load_segments == 1) {
offset = (off_t)paddr + (off_t)nd->header_size;
break;
}
for (i = offset = 0; i < nd->num_pt_load_segments; i++) {
pls = &nd->pt_load_segments[i];
if ((paddr >= pls->phys_start) &&
(paddr < pls->phys_end)) {
offset = (off_t)(paddr - pls->phys_start) +
pls->file_offset;
break;
}
}
if (!offset)
return READ_ERROR;
break;
}
if (lseek(nd->ndfd, offset, SEEK_SET) == -1)
return SEEK_ERROR;
if (write(nd->ndfd, bufptr, cnt) != cnt)
return READ_ERROR;
return cnt;
}
/*
* Set the file pointer for debug output.
*/
FILE *
set_netdump_fp(FILE *fp)
{
if (!VMCORE_VALID())
return NULL;
nd->ofp = fp;
return fp;
}
/*
* Generic print routine to handle integral and remote daemon output.
*/
static void
netdump_print(char *fmt, ...)
{
char buf[BUFSIZE];
va_list ap;
if (!fmt || !strlen(fmt) || !VMCORE_VALID())
return;
va_start(ap, fmt);
(void)vsnprintf(buf, BUFSIZE, fmt, ap);
va_end(ap);
if (nd->ofp)
fprintf(nd->ofp, "%s", buf);
else
console(buf);
}
uint
netdump_page_size(void)
{
if (!VMCORE_VALID())
return 0;
return nd->page_size;
}
int
netdump_free_memory(void)
{
return (VMCORE_VALID() ? 0 : 0);
}
int netdump_memory_used(void)
{
return (VMCORE_VALID() ? 0 : 0);
}
/*
* The netdump server will eventually use the NT_TASKSTRUCT section
* to pass the task address. Until such time, look at the ebp of the
* user_regs_struct, which is located at the end of the NT_PRSTATUS
* elf_prstatus structure, minus one integer:
*
* struct elf_prstatus
* {
* ...
* elf_gregset_t pr_reg; (maps to user_regs_struct)
* int pr_fpvalid;
* };
*
* If it's a kernel stack address who's adjusted task_struct value is
* equal to one of the active set tasks, we'll presume it's legit.
*
*/
ulong
get_netdump_panic_task(void)
{
#ifdef DAEMON
return nd->task_struct;
#else
int i, crashing_cpu;
size_t len;
char *user_regs;
ulong ebp, esp, task;
if (!VMCORE_VALID() || !get_active_set())
goto panic_task_undetermined;
if (nd->task_struct) {
if (CRASHDEBUG(1))
error(INFO,
"get_netdump_panic_task: NT_TASKSTRUCT: %lx\n",
nd->task_struct);
return nd->task_struct;
}
switch (DUMPFILE_FORMAT(nd->flags))
{
case NETDUMP_ELF32:
case NETDUMP_ELF64:
crashing_cpu = -1;
break;
case KDUMP_ELF32:
case KDUMP_ELF64:
crashing_cpu = -1;
if (kernel_symbol_exists("crashing_cpu")) {
get_symbol_data("crashing_cpu", sizeof(int), &i);
if ((i >= 0) && in_cpu_map(ONLINE_MAP, i)) {
crashing_cpu = i;
if (CRASHDEBUG(1))
error(INFO,
"get_netdump_panic_task: active_set[crashing_cpu: %d]: %lx\n",
crashing_cpu,
tt->active_set[crashing_cpu]);
}
}
if ((nd->num_prstatus_notes > 1) && (crashing_cpu == -1))
goto panic_task_undetermined;
break;
default:
crashing_cpu = -1;
break;
}
if (nd->elf32 && (nd->elf32->e_machine == EM_386)) {
Elf32_Nhdr *note32 = NULL;
if (nd->num_prstatus_notes > 1) {
if (crashing_cpu != -1)
note32 = (Elf32_Nhdr *)
nd->nt_prstatus_percpu[crashing_cpu];
} else
note32 = (Elf32_Nhdr *)nd->nt_prstatus;