mirror of https://github.com/crash-utility/crash
455 lines
10 KiB
C
455 lines
10 KiB
C
/* va_server.c - kernel crash dump file translation library
|
|
*
|
|
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
|
|
* Copyright (C) 2002-2006, 2011, 2013 David Anderson
|
|
* Copyright (C) 2002-2006, 2011, 2013 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.
|
|
*
|
|
* 10/99, Dave Winchell, Initial release for kernel crash dump support.
|
|
* 11/12/99, Dave Winchell, Add support for in memory dumps.
|
|
*/
|
|
#include <zlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "va_server.h"
|
|
#include <errno.h>
|
|
#include <sys/mman.h>
|
|
#include <signal.h>
|
|
|
|
|
|
struct map_hdr *vas_map_base = (struct map_hdr *)0; /* base of tree */
|
|
|
|
#ifdef NOT_DEF
|
|
#define trunc_page(x) ((void *)(((unsigned long)(x)) & ~((unsigned long)(page_size - 1))))
|
|
#define round_page(x) trunc_page(((unsigned long)(x)) + ((unsigned long)(page_size - 1)))
|
|
#endif
|
|
|
|
u_long vas_base_va;
|
|
u_long vas_start_va;
|
|
|
|
FILE *vas_file_p;
|
|
char *zero_page;
|
|
int vas_version;
|
|
|
|
int read_map(char *crash_file);
|
|
void load_data(struct crash_map_entry *m);
|
|
int find_data(u_long va, u_long *buf, u_long *len, u_long *offset);
|
|
u_long vas_find_end(void);
|
|
int vas_free_memory(char *);
|
|
int vas_memory_used(void);
|
|
int vas_memory_dump(FILE *);
|
|
int mclx_page_size(void);
|
|
void set_vas_debug(ulong);
|
|
|
|
extern int monitor_memory(long *, long *, long *, long *);
|
|
|
|
int Page_Size;
|
|
ulong vas_debug = 0;
|
|
|
|
extern void *malloc(size_t);
|
|
|
|
int va_server_init(char *crash_file, u_long *start, u_long *end, u_long *stride)
|
|
{
|
|
Page_Size = getpagesize(); /* temporary setting until disk header is read */
|
|
|
|
if(read_map(crash_file)) {
|
|
if(va_server_init_v1(crash_file, start, end, stride))
|
|
return -1;
|
|
vas_version = 1;
|
|
return 0;
|
|
}
|
|
|
|
vas_version = 2;
|
|
zero_page = (char *)malloc(Page_Size);
|
|
bzero((void *)zero_page, Page_Size);
|
|
|
|
vas_base_va = vas_start_va = vas_map_base->map[0].start_va;
|
|
|
|
if(start)
|
|
*start = vas_start_va;
|
|
if(end) {
|
|
*end = vas_find_end();
|
|
}
|
|
if(stride)
|
|
*stride = Page_Size;
|
|
return 0;
|
|
}
|
|
|
|
int vas_lseek(u_long position, int whence)
|
|
{
|
|
if(vas_version < 2)
|
|
return vas_lseek_v1(position, whence);
|
|
|
|
if(whence != SEEK_SET)
|
|
return -1;
|
|
|
|
vas_base_va = vas_start_va + position;
|
|
return 0;
|
|
}
|
|
|
|
size_t vas_read(void *buf_in, size_t count)
|
|
{
|
|
u_long len, offset, buf, va;
|
|
u_long num, output, remaining;
|
|
|
|
if(vas_version < 2)
|
|
return vas_read_v1(buf_in, count);
|
|
|
|
va = vas_base_va;
|
|
remaining = count;
|
|
output = (u_long)buf_in;
|
|
|
|
while(remaining) {
|
|
find_data(va, &buf, &len, &offset);
|
|
num = (remaining > (len - offset)) ? (len - offset) : remaining;
|
|
bcopy((const void *)(buf+offset), (void *)output, num);
|
|
remaining -= num;
|
|
va += num;
|
|
output += num;
|
|
}
|
|
vas_base_va += count;
|
|
return count;
|
|
}
|
|
size_t vas_write(void *buf_in, size_t count)
|
|
{
|
|
u_long len, offset, buf, va;
|
|
|
|
if(vas_version < 2)
|
|
return vas_write_v1(buf_in, count);
|
|
|
|
if(count != sizeof(u_long)) {
|
|
printf("count %d not %d\n", (int)count, (int)sizeof(u_long));
|
|
return -1;
|
|
}
|
|
va = vas_base_va;
|
|
if(!find_data(va, &buf, &len, &offset))
|
|
*(u_long *)(buf+offset) = *(u_long *)buf_in;
|
|
|
|
vas_base_va += count;
|
|
return count;
|
|
}
|
|
void vas_free_data(u_long va)
|
|
{
|
|
struct crash_map_entry *m, *last_m;
|
|
|
|
if(vas_version < 2) {
|
|
vas_free_data_v1(va);
|
|
return;
|
|
}
|
|
|
|
m = last_m = vas_map_base->map;
|
|
for(;m->start_va;) {
|
|
if(m->start_va > va)
|
|
break;
|
|
last_m = m;
|
|
m++;
|
|
}
|
|
if(last_m->exp_data) {
|
|
free((void *)last_m->exp_data);
|
|
last_m->exp_data = 0;
|
|
}
|
|
}
|
|
|
|
u_long vas_find_end(void)
|
|
{
|
|
struct crash_map_entry *m;
|
|
u_long *sub_m;
|
|
|
|
m = vas_map_base->map;
|
|
for(;m->start_va;m++)
|
|
;
|
|
m--;
|
|
load_data(m);
|
|
sub_m = (u_long *)m->exp_data;
|
|
for(;*sub_m; sub_m++)
|
|
;
|
|
sub_m--;
|
|
return *sub_m;
|
|
}
|
|
int find_data(u_long va, u_long *buf, u_long *len, u_long *offset)
|
|
{
|
|
u_long off;
|
|
struct crash_map_entry *m, *last_m;
|
|
u_long *sub_m, va_saved;
|
|
char *data;
|
|
int saved;
|
|
|
|
m = last_m = vas_map_base->map;
|
|
for(;m->start_va;) {
|
|
if(m->start_va > va)
|
|
break;
|
|
last_m = m;
|
|
m++;
|
|
}
|
|
load_data(last_m);
|
|
sub_m = (u_long *)last_m->exp_data;
|
|
data = last_m->exp_data + CRASH_SUB_MAP_PAGES*Page_Size;
|
|
|
|
saved = 0;
|
|
for(;*sub_m; sub_m++, data += Page_Size) {
|
|
va_saved = *sub_m;
|
|
if((va >= va_saved) && (va < (va_saved + Page_Size))) {
|
|
saved = 1;
|
|
break;
|
|
}
|
|
else if(va < va_saved)
|
|
break;
|
|
}
|
|
off = va - (u_long)trunc_page(va);
|
|
if(offset)
|
|
*offset = off;
|
|
if(len)
|
|
*len = Page_Size;
|
|
|
|
if (vas_debug && !saved)
|
|
fprintf(stderr, "find_data: page containing %lx not saved\n",
|
|
(u_long)trunc_page(va));
|
|
|
|
if(buf)
|
|
*buf = saved ? (u_long)data : (u_long)zero_page;
|
|
return (saved ^ 1);
|
|
}
|
|
|
|
void load_data(struct crash_map_entry *m)
|
|
{
|
|
char *compr_buf;
|
|
char *exp_buf;
|
|
int ret, items;
|
|
uLongf destLen;
|
|
int retries;
|
|
|
|
if(m->exp_data)
|
|
goto out;
|
|
ret = fseek(vas_file_p, (long)(m->start_blk * Page_Size),
|
|
SEEK_SET);
|
|
|
|
if(ret == -1) {
|
|
printf("load_data: unable to fseek, errno = %d\n", ferror(vas_file_p));
|
|
clean_exit(1);
|
|
}
|
|
|
|
retries = 0;
|
|
load_data_retry1:
|
|
|
|
compr_buf = (char *)malloc(m->num_blks * Page_Size);
|
|
if(!compr_buf) {
|
|
if (retries++ == 0) {
|
|
vas_free_memory("malloc failure: out of memory");
|
|
goto load_data_retry1;
|
|
}
|
|
fprintf(stderr, "FATAL ERROR: malloc failure: out of memory\n");
|
|
clean_exit(1);
|
|
}
|
|
items = fread((void *)compr_buf, sizeof(char), m->num_blks * Page_Size, vas_file_p);
|
|
if(items != m->num_blks * Page_Size) {
|
|
printf("unable to read blocks from errno = %d\n", ferror(vas_file_p));
|
|
clean_exit(1);
|
|
}
|
|
load_data_retry2:
|
|
m->exp_data = exp_buf =
|
|
(char *)malloc((CRASH_SOURCE_PAGES+CRASH_SUB_MAP_PAGES) * Page_Size);
|
|
if(!exp_buf) {
|
|
if (retries++ == 0) {
|
|
vas_free_memory("malloc failure: out of memory");
|
|
goto load_data_retry2;
|
|
}
|
|
fprintf(stderr, "FATAL ERROR: malloc failure: out of memory\n");
|
|
clean_exit(1);
|
|
}
|
|
destLen = (uLongf)((CRASH_SOURCE_PAGES+CRASH_SUB_MAP_PAGES) * Page_Size);
|
|
ret = uncompress((Bytef *)exp_buf, &destLen, (const Bytef *)compr_buf, (uLong)items);
|
|
|
|
if(ret) {
|
|
if(ret == Z_MEM_ERROR)
|
|
printf("load_data, bad ret Z_MEM_ERROR from uncompress\n");
|
|
else if(ret == Z_BUF_ERROR)
|
|
printf("load_data, bad ret Z_BUF_ERROR from uncompress\n");
|
|
else if(ret == Z_DATA_ERROR)
|
|
printf("load_data, bad ret Z_DATA_ERROR from uncompress\n");
|
|
else
|
|
printf("load_data, bad ret %d from uncompress\n", ret);
|
|
|
|
clean_exit(1);
|
|
}
|
|
free((void *)compr_buf);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
|
|
int read_map(char *crash_file)
|
|
{
|
|
struct crash_map_hdr *disk_hdr;
|
|
int ret, items;
|
|
struct map_hdr *hdr;
|
|
|
|
vas_file_p = fopen(crash_file, "r");
|
|
if(vas_file_p == (FILE *)0) {
|
|
printf("read_maps: bad ret from fopen for %s: %s\n", crash_file, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
hdr = (struct map_hdr *)malloc(sizeof(struct map_hdr));
|
|
if(!hdr) {
|
|
printf("read_map: unable to malloc mem\n");
|
|
return -1;
|
|
}
|
|
bzero((void *)hdr, sizeof(struct map_hdr));
|
|
disk_hdr = (struct crash_map_hdr *)malloc(Page_Size);
|
|
ret = fseek(vas_file_p, (long)0, SEEK_SET);
|
|
if(ret == -1) {
|
|
printf("va_server: unable to fseek, err = %d\n", ferror(vas_file_p));
|
|
free(hdr);
|
|
free(disk_hdr);
|
|
return -1;
|
|
}
|
|
items = fread((void *)disk_hdr, 1, Page_Size, vas_file_p);
|
|
if(items != Page_Size) {
|
|
free(hdr);
|
|
free(disk_hdr);
|
|
return -1;
|
|
}
|
|
if(disk_hdr->magic[0] != CRASH_MAGIC) {
|
|
free(hdr);
|
|
free(disk_hdr);
|
|
return -1;
|
|
}
|
|
ret = fseek(vas_file_p, (long)((disk_hdr->map_block) * disk_hdr->blk_size), SEEK_SET);
|
|
|
|
if(ret == -1) {
|
|
printf("va_server: unable to fseek, err = %d\n", ferror(vas_file_p));
|
|
free(hdr);
|
|
free(disk_hdr);
|
|
return -1;
|
|
}
|
|
|
|
Page_Size = disk_hdr->blk_size; /* over-ride PAGE_SIZE */
|
|
hdr->blk_size = disk_hdr->blk_size;
|
|
hdr->map = (struct crash_map_entry *)malloc(disk_hdr->map_blocks * disk_hdr->blk_size);
|
|
|
|
items = fread((void *)hdr->map, hdr->blk_size, disk_hdr->map_blocks,
|
|
vas_file_p);
|
|
if(items != disk_hdr->map_blocks) {
|
|
printf("unable to read map entries, err = %d\n", errno);
|
|
free(hdr);
|
|
free(disk_hdr);
|
|
return -1;
|
|
}
|
|
|
|
vas_map_base = hdr;
|
|
free(disk_hdr);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
vas_free_memory(char *s)
|
|
{
|
|
struct crash_map_entry *m;
|
|
long swap_usage;
|
|
int blks;
|
|
|
|
if (vas_version < 2)
|
|
return 0;
|
|
|
|
if (s) {
|
|
fprintf(stderr, "\nWARNING: %s ", s);
|
|
|
|
if (monitor_memory(NULL, NULL, NULL, &swap_usage))
|
|
fprintf(stderr, "(swap space usage: %ld%%)",
|
|
swap_usage);
|
|
|
|
fprintf(stderr,
|
|
"\nWARNING: memory/swap exhaustion may cause this session to be killed\n");
|
|
}
|
|
|
|
for (blks = 0, m = vas_map_base->map; m->start_va; m++) {
|
|
if (m->exp_data) {
|
|
free((void *)m->exp_data);
|
|
m->exp_data = 0;
|
|
blks += m->num_blks;
|
|
}
|
|
}
|
|
|
|
return blks;
|
|
}
|
|
|
|
int
|
|
vas_memory_used(void)
|
|
{
|
|
struct crash_map_entry *m;
|
|
int blks;
|
|
|
|
if (vas_version < 2)
|
|
return 0;
|
|
|
|
for (blks = 0, m = vas_map_base->map; m->start_va; m++) {
|
|
if (m->exp_data)
|
|
blks += m->num_blks;
|
|
}
|
|
|
|
return blks;
|
|
}
|
|
|
|
char *memory_dump_hdr_32 = "START_VA EXP_DATA START_BLK NUM_BLKS\n";
|
|
char *memory_dump_fmt_32 = "%8lx %8lx %9d %8d\n";
|
|
char *memory_dump_hdr_64 = \
|
|
" START_VA EXP_DATA START_BLK NUM_BLKS\n";
|
|
char *memory_dump_fmt_64 = "%16lx %16lx %9d %8d\n";
|
|
|
|
int
|
|
vas_memory_dump(FILE *fp)
|
|
{
|
|
struct crash_map_entry *m;
|
|
char *hdr, *fmt;
|
|
int blks;
|
|
|
|
if (vas_version < 2) {
|
|
fprintf(fp, "%s\n", vas_version ?
|
|
"version 1: not supported" : "no dumpfile");
|
|
return 0;
|
|
}
|
|
|
|
hdr = sizeof(long) == 4 ? memory_dump_hdr_32 : memory_dump_hdr_64;
|
|
fmt = sizeof(long) == 4 ? memory_dump_fmt_32 : memory_dump_fmt_64;
|
|
|
|
fprintf(fp, "%s", hdr);
|
|
|
|
for (blks = 0, m = vas_map_base->map; m->start_va; m++) {
|
|
fprintf(fp, fmt,
|
|
m->start_va, m->exp_data, m->start_blk, m->num_blks);
|
|
if (m->exp_data)
|
|
blks += m->num_blks;
|
|
}
|
|
|
|
fprintf(fp, "total blocks: %d\n", blks);
|
|
|
|
return blks;
|
|
}
|
|
|
|
int
|
|
mclx_page_size(void)
|
|
{
|
|
return (Page_Size);
|
|
}
|
|
|
|
void
|
|
set_vas_debug(ulong value)
|
|
{
|
|
vas_debug = value;
|
|
}
|