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crash/va_server.c

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/* 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(disk_hdr);
return -1;
}
items = fread((void *)disk_hdr, 1, Page_Size, vas_file_p);
if(items != Page_Size) {
return -1;
}
if(disk_hdr->magic[0] != CRASH_MAGIC) {
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));
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);
return -1;
}
vas_map_base = 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;
}
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