657 lines
17 KiB
C
657 lines
17 KiB
C
/* postmort - post mortem dump Author: C. W. Rose */
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/* Postmort: perform post-mortem on PC Minix 1.7 core files.
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*
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*/
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/* The 1.5 core file structure is a struct mem_map, the segment memory map,
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* followed by a struct proc, the process table, followed by a dump of the
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* text, data, and stack segments.
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*
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* This is the 8086/Intel version; 386 and 68K will differ. It defaults to
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* using the name 'core' for the core file, and 'a.out' for the symbol file.
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* If there is no 'a.out', it will try and read the symbol table from
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* 'symbol.out', then give up. A non-existant symbol table is not a fatal
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* error unless the -s option was used.
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*
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* The PC 1.5 kernel dump routines are odd - they dump the memory maps twice,
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* the second time as part of the kernel process table, and the kernel
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* process table size must be a multiple of 4. Should a core file have a
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* header with a magic number in future?
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*
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* The kernel include file paths need to be edited for each machine. */
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#include <sys/types.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <limits.h>
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#include <timers.h>
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#include <signal.h>
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#include <stdlib.h>
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#undef EXTERN /* <minix/const.h> defined this */
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#define EXTERN /* so we get proc & mproc */
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#include <machine/archtypes.h>
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#include "kernel/const.h"
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#include "kernel/type.h"
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#include "kernel/proc.h"
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#undef printf /* kernel's const.h defined this */
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#include "pm/mproc.h"
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#include <a.out.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#define FALSE 0
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#undef TRUE
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#define TRUE ~FALSE
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#define OK 1
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#define FAILED -1
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#define CORE "core"
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#define AOUT "a.out"
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#define SYMB "symbol.out"
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#define LINE_LEN 16
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#define MAXSYM 200
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#define SYMLEN 8
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/* Global variables */
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int opt_c = FALSE; /* name of core file */
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int opt_d = FALSE; /* dump raw data and stack segments */
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int opt_p = FALSE; /* dump the kernel process table */
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int opt_s = FALSE; /* name of symbol file */
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int opt_t = FALSE; /* trace back the stack */
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int opt_x = FALSE; /* debugging flag */
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char progname[20]; /* program name */
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char *segment_name[] = { /* array of segment names */
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"Text",
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"Data",
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"Stack"
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};
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int dbglvl = 0; /* debugging level */
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int maxsym; /* maximum symbol number */
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unsigned int baseptr; /* reference copy of stack base pointer */
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unsigned int stackptr; /* reference copy of stack pointer */
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long int lengths[NR_LOCAL_SEGS]; /* segment lengths */
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long int bases[NR_LOCAL_SEGS]; /* segment base addresses */
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struct sym { /* symbol table addresses and labels */
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unsigned int addr;
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char label[SYMLEN + 1];
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} symtab[MAXSYM];
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/* Used by getopt(3) package */
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extern int optind, opterr, optopt;
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extern char *optarg;
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_PROTOTYPE(int binary, (int uc, char *sp));
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_PROTOTYPE(void dump_all_segs, (int fd));
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_PROTOTYPE(void dump_maps, (struct mem_map * mp));
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_PROTOTYPE(void dump_one_seg, (int fd, int segindex));
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_PROTOTYPE(void dump_proc_table, (struct proc * pt));
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_PROTOTYPE(void dump_registers, (struct proc * pt));
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_PROTOTYPE(void dump_sym_tab, (struct sym *st));
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_PROTOTYPE(void dump_stack, (struct stackframe_s * sp));
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_PROTOTYPE(int main, (int argc, char *argv[]));
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_PROTOTYPE(int parse_line, (char *ps));
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_PROTOTYPE(int read_symbol, (int fd));
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_PROTOTYPE(void stack_trace, (int fd));
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_PROTOTYPE(void usage, (void));
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/* B i n a r y
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*
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* Produce a binary representation of an 8-bit number.
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*/
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int binary(ucc, sp)
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int ucc;
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char *sp;
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{
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int j;
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unsigned char k, uc;
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uc = (unsigned char) ucc;
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for (k = 0x80, j = 0; j < 8; j++) {
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if ((uc & k) == 0)
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*sp++ = '0';
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else
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*sp++ = '1';
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if (j == 3) *sp++ = '$';
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k >>= 1;
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}
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*sp = '\0';
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return(0);
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}
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/* D u m p _ a l l _ s e g s
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*
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* Dump all the segments except for text
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*/
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void dump_all_segs(fd)
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int fd;
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{
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int j;
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long int start;
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start = (long) (NR_LOCAL_SEGS * sizeof(struct mem_map)) + sizeof(struct proc);
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for (j = 1; j < NR_LOCAL_SEGS; j++) {
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start += lengths[j - 1];
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(void) lseek(fd, start, 0);
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printf("\n");
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dump_one_seg(fd, j);
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}
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}
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/* D u m p _ m a p s
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*
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* Dump the memory maps
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*/
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void dump_maps(mp)
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struct mem_map *mp;
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{
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int j;
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long int vir, phy, len;
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printf("\t Virtual\t Physical\tLength\n");
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printf("\t address\t address\n");
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for (j = 0; j < NR_LOCAL_SEGS; j++) {
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vir = (long) mp[j].mem_vir << CLICK_SHIFT;
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phy = (long) mp[j].mem_phys << CLICK_SHIFT;
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len = (long) mp[j].mem_len << CLICK_SHIFT;
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printf("%s:\t0x%08.8lx\t0x%08.8lx\t%8ld (0x%08.8lx)\n",
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segment_name[j], vir, phy, len, len);
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lengths[j] = len;
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bases[j] = vir;
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}
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}
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/* D u m p _ o n e _ s e g
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*
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* Dump a single segment
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*/
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void dump_one_seg(fd, segindex)
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int fd, segindex;
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{
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unsigned char dlen[LINE_LEN];
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int i, amt, amt_read;
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long int len, offset;
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printf("%s segment\n\n", segment_name[segindex]);
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len = lengths[segindex];
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amt = LINE_LEN;
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for (offset = 0; offset < len; offset += amt) {
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if ((len - offset) < LINE_LEN) amt = (int) (len - offset);
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if (dbglvl > 0)
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printf("Length %ld, offset %ld, amt %d\n", len, offset, amt);
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if ((amt_read = read(fd, (char *) dlen, (unsigned int) amt)) == -1) {
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printf("Unexpected end of file\n");
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exit(1);
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}
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printf("%08.8lx: ", bases[segindex] + offset);
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for (i = 0; i < amt_read; i++) {
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if (i == LINE_LEN / 2) printf("- ");
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printf("%02.2x ", dlen[i]);
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}
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printf(" ");
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for (i = 0; i < amt_read; i++) {
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if (isprint(dlen[i]))
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(void) putchar((char) dlen[i]);
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else
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(void) putchar('.');
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}
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(void) putchar('\n');
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if (dbglvl > 0 && amt_read != amt)
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printf("wanted = %d, got = %d, offset = %ld\n",
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amt, amt_read, offset);
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}
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}
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/* D u m p _ p r o c _ t a b l e
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*
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* Dump the entire kernel proc table
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*/
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void dump_proc_table(pt)
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struct proc *pt;
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{
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printf("Kernel process table entries:\n\n");
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#if 0
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printf("Process' registers: 0x%04.4x\n", pt->p_reg); /* struct stackframe_s */
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printf("Selector in gdt: 0x%04.4x\n", pt->p_ldt_sel); /* reg_t */
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printf("Descriptors for code and data: 0x%04.4x\n", pt->p_ldt[2]); /* struct segdesc_s */
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#endif
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printf("Number of this process: 0x%04.4x\n", pt->p_nr); /* int */
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#if 0
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printf("Nonzero if blocked by busy task: 0x%04.4x\n", pt->p_ntf_blocked); /* int */
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printf("Nonzero if held by busy syscall: 0x%04.4x\n", pt->p_ntf_held); /* int */
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printf("Next in chain of held-up processes: 0x%04.4x\n", pt->p_ntf_nextheld); /* struct proc * */
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#endif
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printf("SENDING, RECEIVING, etc.: 0x%04.4x\n", pt->p_rts_flags); /* int */
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#if 0
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printf("Memory map: 0x%04.4x\n", pt->p_map[NR_LOCAL_SEGS]); /* struct mem_map */
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#endif
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#if DEAD_CODE
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printf("Process id passed in from PM: 0x%04.4x\n", pt->p_pid); /* int */
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#endif
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#if 0
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printf("User time in ticks: %ld\n", pt->user_time); /* time_t */
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printf("Sys time in ticks: %ld\n", pt->sys_time); /* time_t */
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printf("Cumulative user time of children: %ld\n", pt->child_utime); /* time_t */
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printf("Cumulative sys time of children: %ld\n", pt->child_stime); /* time_t */
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printf("Ticks used in current quantum: %d\n", pt->quantum_time); /* int */
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printf("Ticks used in last quantum: %d\n", pt->quantum_last); /* int */
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printf("Current priority of the process: %d\n", pt->curr_prio); /* int */
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printf("Base priority of the process: %d\n", pt->base_prio); /* int */
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printf("Scale for profiling, 0 = none: %u\n", pt->p_pscale); /* unsigned */
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printf("Profiling pc lower boundary: %d\n", pt->p_plow); /* vir_bytes */
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printf("Profiling pc upper boundary: %d\n", pt->p_phigh); /* vir_bytes */
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printf("Profiling buffer: %d\n", pt->p_pbuf); /* vir_bytes */
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printf("Profiling buffer size: %d\n", pt->p_psiz); /* vir_bytes */
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#endif
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#if 0
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printf("First proc wishing to send: 0x%04.4x\n", pt->p_callerq); /* struct proc * */
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printf("Link to next proc wishing to send: 0x%04.4x\n", pt->p_sendlink); /* struct proc * */
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printf("Pointer to message buffer: 0x%04.4x\n", pt->p_messbuf); /* message * */
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#endif
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printf("Expecting message from: 0x%04.4x\n", pt->p_getfrom_e); /* int */
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#if 0
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printf("Pointer to next ready process: 0x%04.4x\n", pt->p_nextready); /* struct proc * */
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#endif
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printf("Bit map for pending signals 1-16: 0x%04.4x\n", pt->p_pending); /* int */
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#if 0
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printf("Count of pending/unfinished signals: 0x%04.4x\n", pt->p_pendcount); /* unsigned */
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#endif
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}
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/* D u m p _ r e g i s t e r s
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*
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* Dump the registers from the proc table
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*/
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void dump_registers(pt)
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struct proc *pt;
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{
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char buff[32];
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unsigned char uc;
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/* Print the registers */
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dump_stack(&pt->p_reg);
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/* Build up a binary representation of the signal flags */
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uc = (pt->p_pending >> 8) & 0xff;
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(void) binary((int) uc, buff);
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buff[9] = '$';
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uc = pt->p_pending & 0xff;
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(void) binary((int) uc, buff + 10);
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printf("Pending signals = %s\n", buff);
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}
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/* D u m p _ s y m _ t a b
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*
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* Dump the symbol table
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*/
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void dump_sym_tab(st)
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struct sym *st;
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{
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int j;
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printf("Symbol table entries (text):\n\n");
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for (j = 0; j < maxsym; j++)
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printf("0x%08.8x T %s\n", symtab[j].addr, symtab[j].label);
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}
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/* D u m p _ s t a c k
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*
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* Dump the stack frame
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*/
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void dump_stack(sp)
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struct stackframe_s *sp;
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{
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char buff[32];
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unsigned char uc;
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/* Build up the binary PSW representation */
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uc = (sp->psw >> 8) & 0xff;
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(void) binary((int) uc, buff);
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uc = sp->psw & 0xff;
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buff[9] = '$';
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(void) binary((int) uc, buff + 10);
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/* Print all the information */
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printf("Stack Frame:\tPC = %04.4x\t\t PSW = %s\n",
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sp->pc, buff);
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printf("\t\t\t\t\tStatus = ____ ODIT SZ_A _P_C\n");
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printf(" ax bx cx dx di si\n");
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printf(" %04.4x\t%04.4x\t%04.4x\t%04.4x\t%04.4x\t%04.4x\n",
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sp->retreg, sp->bx, sp->cx, sp->dx, sp->di, sp->si);
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printf(" sp bp ss\n");
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printf(" %04.4x\t%04.4x\t%04.4x\n",
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sp->sp, sp->fp, sp->ss);
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printf(" cs ds es\n");
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printf(" %04.4x\t%04.4x\t%04.4x\n",
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sp->cs, sp->ds, sp->es);
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/* Store for future reference */
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stackptr = sp->sp;
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baseptr = sp->fp;
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if (dbglvl > 0)
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printf("\nStack pointer 0x%x, Base pointer 0x%x\n", stackptr, baseptr);
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}
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/* M a i n
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*
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* Main program
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*/
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int j, fdc, fds;
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char *cp, corefile[132], symbfile[132];
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struct proc proc_entry;
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struct mem_map mp_segs[NR_LOCAL_SEGS];
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/* Initial set up */
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if ((cp = strrchr(argv[0], '/')) == (char *) NULL)
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cp = argv[0];
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else
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cp++;
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strncpy(progname, cp, 19);
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strncpy(corefile, CORE, 131);
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strncpy(symbfile, AOUT, 131);
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/* Parse arguments */
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opterr = 0;
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while ((j = getopt(argc, argv, "c:dps:tx:")) != EOF) {
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switch (j & 0177) {
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case 'c':
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opt_c = TRUE;
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strncpy(corefile, optarg, 131);
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break;
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case 'd': opt_d = TRUE; break;
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case 'p': opt_p = TRUE; break;
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case 's':
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opt_s = TRUE;
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strncpy(symbfile, optarg, 131);
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break;
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case 't': opt_t = TRUE; break;
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case 'x':
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dbglvl = atoi(optarg);
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opt_x = TRUE;
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break;
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case '?':
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default:
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usage();
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exit(1);
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break;
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}
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}
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/* We must have a core file */
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if ((fdc = open(corefile, O_RDONLY)) == -1) {
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fprintf(stderr, "Cannot open %s\n", corefile);
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exit(1);
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}
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/* We'd like an a.out file or a symbol table */
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if ((fds = open(symbfile, O_RDONLY)) == -1) {
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if (opt_s)
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j = FAILED;
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else {
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strncpy(symbfile, AOUT, 131);
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if ((fds = open(symbfile, O_RDONLY)) == -1)
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j = FAILED;
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else
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j = read_symbol(fds);
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}
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} else
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j = read_symbol(fds);
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/* Only fatal if we insisted */
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if (opt_s && j == FAILED) {
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fprintf(stderr, "Cannot find symbols in %s\n", symbfile);
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exit(1);
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}
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/* Read the process table */
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if (dbglvl > 0) {
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printf("\n");
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printf("Size of mproc entry %d\n", NR_LOCAL_SEGS * sizeof(struct mem_map));
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printf("Size of process table %d\n", sizeof(proc_entry));
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}
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if (read(fdc, (char *) mp_segs, sizeof(mp_segs)) != sizeof(mp_segs) ||
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read(fdc, (char *) &proc_entry,
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sizeof(struct proc)) != sizeof(struct proc)) {
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fprintf(stderr, "Cannot open %s\n", corefile);
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exit(1);
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}
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/* Do the work */
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#if 0
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dump_maps(mp_segs); /* duplicated in the kernel */
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printf("\n");
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/* XXX broken */
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dump_maps(proc_entry.p_map);
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#endif
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printf("\n");
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dump_registers(&proc_entry);
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if (opt_t) {
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printf("\n");
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stack_trace(fdc);
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}
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if (opt_p) {
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printf("\n");
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dump_proc_table(&proc_entry);
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}
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if (opt_d) {
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printf("\n");
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dump_sym_tab(symtab);
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dump_all_segs(fdc);
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}
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/* Wrap up */
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(void) close(fdc);
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if (fds != -1) (void) close(fds);
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exit(0);
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/* NOTREACHED */
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}
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/* P a r s e _ l i n e
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*
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* Parse a line of the symbol table
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*/
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int parse_line(ps)
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char *ps;
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{
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char c, s[80];
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int j, k;
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unsigned int u;
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/* We must have space in the table */
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if (maxsym == MAXSYM) return(FAILED);
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/* Lines must be a minimum length to contain information */
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if (strlen(ps) < 8) return(FAILED);
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|
|
/* Lines must have a definite structure */
|
|
if (ps[1] != ' ' || ps[6] != ' ') return(FAILED);
|
|
for (j = 2; j < 6; j++)
|
|
if (!isxdigit(ps[j])) return(FAILED);
|
|
if (sscanf(ps, "%c %x %s", &c, &u, s) != 3) return (FAILED);
|
|
|
|
if (dbglvl > 0) printf("Address 0x%04.4x, label %s\n", u, s);
|
|
|
|
/* Load the symbol table in sorted order */
|
|
for (j = 0; j < maxsym; j++) {
|
|
if (u < symtab[j].addr) {
|
|
for (k = maxsym; k > j; k--) symtab[k] = symtab[k - 1];
|
|
break;
|
|
}
|
|
}
|
|
symtab[j].addr = u;
|
|
strncpy(symtab[j].label, s, SYMLEN);
|
|
maxsym++;
|
|
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/* R e a d _ s y m b o l
|
|
*
|
|
* Read the symbol table
|
|
*/
|
|
int read_symbol(fd)
|
|
int fd;
|
|
{
|
|
char sym[80], buff[BUFSIZ];
|
|
int j, k, m;
|
|
long int offset;
|
|
struct exec *ep;
|
|
struct nlist *np;
|
|
|
|
/* We collect only text symbols, since that's all that's needed here */
|
|
|
|
/* Initialise the buffer */
|
|
if ((j = read(fd, buff, BUFSIZ)) == 0 || j == -1) return(FAILED);
|
|
|
|
k = maxsym = 0;
|
|
|
|
/* Find out what we've got */
|
|
ep = (struct exec *) buff;
|
|
np = (struct nlist *) buff;
|
|
if (BADMAG(*ep)) {
|
|
/* Must be a separate symbol table */
|
|
while (TRUE) {
|
|
if (buff[k] == 'T') {
|
|
for (m = 0; m < 78; m++) {
|
|
sym[m] = buff[k];
|
|
if (++k == j) {
|
|
if ((j = read(fd, buff, BUFSIZ)) == 0 || j == -1)
|
|
break;
|
|
k = 0;
|
|
}
|
|
if (buff[k] == '\n') break;
|
|
}
|
|
sym[m + 1] = '\0';
|
|
(void) parse_line(sym);
|
|
}
|
|
if (++k == j) {
|
|
if ((j = read(fd, buff, BUFSIZ)) == 0 || j == -1)
|
|
break;
|
|
k = 0;
|
|
}
|
|
}
|
|
} else if (ep->a_syms != 0L) {
|
|
/* There's symbols in them thar hills */
|
|
offset = 8 * sizeof(long) + ep->a_text + ep->a_data;
|
|
if (lseek(fd, offset, 0) == -1L) return(FAILED);
|
|
/* Symbols are in an unsorted list */
|
|
while (read(fd, buff, sizeof(struct nlist)) == sizeof(struct nlist)) {
|
|
if (np->n_sclass == (N_TEXT + C_EXT)) { /* external text symbols */
|
|
for (j = 0; j < maxsym; j++) {
|
|
if (np->n_value < symtab[j].addr) {
|
|
for (k = maxsym; k > j; k--)
|
|
symtab[k] = symtab[k - 1];
|
|
break;
|
|
}
|
|
}
|
|
symtab[j].addr = np->n_value;
|
|
strncpy(symtab[j].label, np->n_name, SYMLEN);
|
|
if (maxsym++ == MAXSYM) break;
|
|
}
|
|
}
|
|
} else if (opt_s)
|
|
return(FAILED);
|
|
|
|
if (dbglvl > 0) {
|
|
for (m = 0; m < maxsym; m++) printf("Addr 0x%04.4x, label %s\n",
|
|
symtab[m].addr, symtab[m].label);
|
|
printf("Maxsym %d\n", maxsym);
|
|
}
|
|
return(OK);
|
|
}
|
|
|
|
|
|
/* S t a c k _ t r a c e
|
|
*
|
|
* Trace back down the stack frames.
|
|
*
|
|
* WARNING: very, very, non-portable code
|
|
*/
|
|
void stack_trace(fd)
|
|
int fd;
|
|
{
|
|
int j;
|
|
unsigned int framepointer, lastpointer, returnvalue, end;
|
|
long int offset, bp;
|
|
|
|
/* Bp actually gives the offset from the base of the data segment */
|
|
bp = (long) (NR_LOCAL_SEGS * sizeof(struct mem_map)) + sizeof(struct proc)
|
|
+ lengths[0] + lengths[1] - bases[2];
|
|
if ((offset = lseek(fd, bp + (long int) baseptr, 0)) == -1L) return;
|
|
end = (bases[2] + lengths[2] - 1) & 0xffff;
|
|
|
|
if (dbglvl > 0)
|
|
printf("Baseptr %x, End %x, Bp %ld, Offset %ld\n", baseptr, end, bp, offset);
|
|
|
|
/* Print the header, then try to backtrace */
|
|
printf("Stack back trace:\n\n");
|
|
printf("Frame address. Contents. Return address.");
|
|
if (maxsym != 0) printf(" Previous label.");
|
|
printf("\n");
|
|
|
|
lastpointer = baseptr;
|
|
while (TRUE) {
|
|
/* Read the frame pointer and return address values */
|
|
if (read(fd, (char *) &framepointer, sizeof(int)) == -1 ||
|
|
read(fd, (char *) &returnvalue, sizeof(int)) == -1)
|
|
break;
|
|
|
|
/* Look up the return address - ignored if maxsym == 0 */
|
|
for (j = 0; j < maxsym; j++) {
|
|
if (symtab[j].addr >= returnvalue) break;
|
|
}
|
|
if (j > 0) j--;
|
|
printf(" 0x%04.4x 0x%04.4x 0x%04.4x %s\n",
|
|
lastpointer, framepointer, returnvalue,
|
|
(maxsym == 0) ? "" : symtab[j].label);
|
|
|
|
/* If the result is clearly invalid, quit */
|
|
if (framepointer == 0 || framepointer >= end || framepointer <= lastpointer)
|
|
break;
|
|
|
|
/* Otherwise try to move to the next frame base */
|
|
lastpointer = framepointer;
|
|
if ((offset = lseek(fd, bp + (long int) framepointer, 0)) == -1L || offset == 0L)
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/* U s a g e
|
|
*
|
|
* Usage message
|
|
*/
|
|
void usage()
|
|
{
|
|
fprintf(stderr, "Usage: %s [-dpt] [-c corefile] [-s symbfile]\n", progname);
|
|
}
|