1030 lines
22 KiB
C
1030 lines
22 KiB
C
/*
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* mdb.c - MINIX program debugger
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*
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* Written by Bruce D. Szablak
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*
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* This free software is provided for non-commerical use. No warrantee
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* of fitness for any use is implied. You get what you pay for. Anyone
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* may make modifications and distribute them, but please keep this header
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* in the distribution.
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*/
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/*
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* Originally ported to MINIX-PC and MINIX-386 by Bruce Evans.
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* NB: the original sym.c and mdbdis86.c come from his 'db'
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*
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* Added by Philip Murton:
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*
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* 2.0 'Core' file functions
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* 2.1 Support for GNU exec
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* 2.2 Changes for Minix 1.6.x Beta
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* 2.3 Changes for Minix 1.7.0 and trace syscalls
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* 2.4 Changes for Minix 1.7.2 and clean up
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* 2.5.1 Add better help
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* 2.5.2 Added io.c for logging options
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* 2.5.3 Minor changes and tested with Minix 1.7.4
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* 2.5.4 Command arguments processing improved (Thanks to Will Rose)
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* 2.6.0 Final Version for MINIX CD (Sept/96)
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*/
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#define _MAIN_MDB
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#include "mdb.h"
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#include <minix/type.h>
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#include <stdio.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/wait.h>
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#define ptrace mdbtrace
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#include <sys/ptrace.h>
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#include <setjmp.h>
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#include "proto.h"
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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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/* buffer for proc and pointer to proc */
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extern struct proc *prc;
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#define MAXLINE 128
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#define MAXARG 20
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PRIVATE unsigned long lastexp = 0L; /* last expression and segment */
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PRIVATE int lastseg = NOSEG;
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PRIVATE char *prog; /* prog name */
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PRIVATE char sbuf[MAXLINE];
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PRIVATE char cbuf[MAXLINE];
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PRIVATE char *cmd; /* current command */
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PRIVATE char *cmdstart; /* start of command */
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PRIVATE jmp_buf mainlp;
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struct b_pnt {
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struct b_pnt *nxt, *prv;
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long addr;
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long oldval;
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char cmd[1];
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} *b_head, *curpnt;
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_PROTOTYPE( int main , (int argc, char *argv[]));
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FORWARD _PROTOTYPE( void cleanup , (void));
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FORWARD _PROTOTYPE( void freepnt , (struct b_pnt *pnt ));
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FORWARD _PROTOTYPE( void findbpnt , (int verbose ));
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FORWARD _PROTOTYPE( int exebpnt , (int restart ));
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FORWARD _PROTOTYPE( void catch , (int sig ));
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FORWARD _PROTOTYPE( int run , (char *name , char *argstr , int tflg ));
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FORWARD _PROTOTYPE( int dowait , (void));
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FORWARD _PROTOTYPE( void backtrace , (int all ));
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FORWARD _PROTOTYPE( void modify , (long addr , int cnt , int verbose , int size ));
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FORWARD _PROTOTYPE( void display , (long addr , int req ));
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FORWARD _PROTOTYPE( void fill , (long addr , int req ));
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FORWARD _PROTOTYPE( void dorun , (char *cmd ));
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FORWARD _PROTOTYPE( void not_for_core , (void));
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FORWARD _PROTOTYPE( void command , (void));
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PRIVATE void cleanup()
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{
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curpid = 0;
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curpnt = NULL;
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while (b_head) freepnt(b_head);
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}
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PRIVATE void findbpnt(verbose)
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int verbose;
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{
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for (curpnt = b_head; curpnt; curpnt = curpnt->nxt) {
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if (curpnt->addr == PC_MEMBER(prc) - BREAKPOINT_ADVANCE) {
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ptrace(T_SETINS, curpid, curpnt->addr, curpnt->oldval);
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ptrace(T_SETUSER, curpid, PC_OFF, curpnt->addr);
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#if SYSCALLS_SUPPORT
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if( syscalls )
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do_syscall(curpnt->addr);
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else if (curpnt->cmd[0] != '\n')
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#else
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if (curpnt->cmd[0] != '\n')
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#endif
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cmd = strcpy(cbuf, curpnt->cmd);
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else if (verbose)
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Printf("Breakpoint hit.\n");
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return;
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}
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}
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if (verbose) Printf("Unknown breakpoint hit.\n");
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}
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PRIVATE int exebpnt(restart)
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int restart;
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{
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ptrace(T_STEP, curpid, 0L, (long) restart);
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if (dowait() == 0) return TRUE;
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ptrace(T_SETINS, curpid, curpnt->addr, BREAK(curpnt->oldval));
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curpnt = NULL;
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return FALSE;
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}
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PRIVATE void freepnt(pnt)
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struct b_pnt *pnt;
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{
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if (pnt->prv)
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pnt->prv->nxt = pnt->nxt;
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else
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b_head = pnt->nxt;
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if (pnt->nxt) pnt->nxt->prv = pnt->prv;
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if (curpid > 0) ptrace(T_SETINS, curpid, pnt->addr, pnt->oldval);
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free(pnt);
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if (pnt == curpnt) curpnt = NULL;
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}
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PUBLIC long breakpt(addr, cmd)
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long addr;
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char *cmd;
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{
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struct b_pnt *new;
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if (curpid <= 0) {
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Printf("No active process.\n");
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return 0L;
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}
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for (new = b_head; new; new = new->nxt)
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if (new->addr == addr) {
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Printf("Breakpoint already exists here.\n");
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return 0L;
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}
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new = (struct b_pnt *) malloc(sizeof(struct b_pnt) + strlen(cmd));
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if (new == NULL) {
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Printf("No room for new breakpoint.\n");
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return 0L;
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}
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new->nxt = b_head;
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new->prv = 0;
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if (b_head) b_head->prv = new;
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b_head = new;
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new->addr = addr;
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strcpy(new->cmd, cmd);
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new->oldval = ptrace(T_GETINS, curpid, addr, 0L);
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ptrace(T_SETINS, curpid, addr, BREAK(new->oldval));
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if (ptrace(T_GETINS, curpid, addr, 0L) != BREAK(new->oldval)) {
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do_error("Can't set breakpoint");
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freepnt(new);
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return 0L;
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}
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return new->oldval;
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}
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PRIVATE void catch(sig)
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int sig;
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{
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signal(sig, catch);
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if (sig == SIGINT || sig == SIGQUIT) return;
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tstart(T_EXIT, 0, sig, 0);
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exit(0);
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}
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PRIVATE int dowait()
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{
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int stat;
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if (corepid > 0) return cursig = 0;
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while (wait(&stat) != curpid) {};
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if ( WIFEXITED(stat) ) {
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if (WEXITSTATUS(stat) != 127)
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Printf("child exited with status %d\n", WEXITSTATUS(stat));
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cleanup();
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return 0;
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}
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if ( WIFSIGNALED(stat) ) {
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Printf("child terminated by signal %d\n", WTERMSIG(stat) );
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if (_LOW(stat) & 0x80) Printf("(core dumped)\n");
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cleanup();
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return 0;
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}
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return cursig = WSTOPSIG(stat);
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}
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PUBLIC void tstart(req, verbose, val, cnt)
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int req, verbose, val, cnt;
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{
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if (curpid == 0) {
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if (verbose) Printf("No active process.\n");
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return;
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}
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if (req == T_EXIT) {
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ptrace(T_EXIT, curpid, 0L, (long) val);
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dowait();
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return;
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}
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if (cnt == 0) cnt = 1;
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do {
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if (curpnt) {
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if (exebpnt(val)) return;
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if (req == T_RESUME) cnt++;
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val = 0;
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} else {
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ptrace(req, curpid, 0L, (long) val);
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if (dowait() == 0) return;
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val = 0;
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switch (cursig) {
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case SIGEMT: /* breakpoint */
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update();
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findbpnt(cnt <= 1);
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break;
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case SIGTRAP: /* trace trap? */
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if (req == T_STEP) break;
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default: /* signal */
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val = cursig;
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break;
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}
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}
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}
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while (--cnt > 0);
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update();
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if ( verbose ) dasm((long) PC_MEMBER(prc), 1, 1);
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}
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PRIVATE int run(name, argstr, tflg)
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char *name, *argstr;
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int tflg;
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{
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int procid;
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char *argv[MAXARG], *inf = NULL, *outf = NULL;
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int argc;
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if ((procid = fork()) == 0) {
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/* trace me */
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if (tflg) ptrace(T_OK, 0, 0L, 0L);
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argv[0] = name;
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for (argc = 1;;) {
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argstr = skip(argstr);
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if (*argstr == '\n' || *argstr == ';') {
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argv[argc] = 0;
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if (inf) freopen(inf, "r", stdin);
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if (outf) freopen(outf, "w", stdout);
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if (tflg) {
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execv(name, argv);
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do_error("execv");
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} else {
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execvp(name, argv);
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do_error("execvp");
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}
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exit(127);
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}
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if (*argstr == '<')
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inf = argstr + 1;
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else if (*argstr == '>')
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outf = argstr + 1;
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else if (argc == MAXARG) {
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Printf("Too many arguments.\n");
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exit(127);
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} else
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argv[argc++] = argstr;
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while (!isspace(*argstr)) argstr++;
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if (*argstr == '\n') argstr[1] = '\n', argstr[2] = 0;
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*argstr++ = 0;
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}
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}
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if (procid < 0) do_error("Fork failed.\n");
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return procid;
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}
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PRIVATE void dorun(cmd)
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char *cmd;
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{
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if (curpid = run(prog, cmd, 1)) {
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if (dowait()) {
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ptrace(T_SETUSER, curpid, BP_OFF, 0L);
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update();
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Printf("Process stopped.\n");
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}
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}
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}
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/*
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* backtrace - inspect the stack
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*/
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PRIVATE void backtrace(all)
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int all;
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{
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unsigned long pc, bp, off, val, obp;
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if (curpid <= 0) {
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Printf("No process.\n");
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return;
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}
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pc = get_reg(curpid,PC_OFF);
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bp = get_reg(curpid,BP_OFF);
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if (bp == 0) {
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Printf("No active frame.\n");
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return;
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}
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errno = 0;
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do {
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symbolic(pc, '(');
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pc = (ptrace(T_GETDATA, curpid, bp + ADDRSIZE, 0L)
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>> SHIFT(ADDRSIZE)) & MASK(ADDRSIZE);
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off = ptrace(T_GETINS, curpid, pc, 0L);
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#ifdef DEBUG
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if(debug)
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Printf("Return address %lx Value %lx\n",pc,off);
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#endif
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obp = bp;
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bp += 2 * ADDRSIZE;
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/* Check for various instruction used to restore the stack.
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* Should gives us the number of arguments.
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* This is obvious dependent on interal features of the
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* compiler used.
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*/
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if (ADDQ(off)) off = ADDQ_CNT(off) + bp;
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#ifdef __mc68000__
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else if (LEA(off))
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off = LEA_DISP(off) + bp;
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#endif
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else if (ADDA(off))
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off = ADDA_CNT(ptrace(T_GETINS, curpid, pc + 2, 0L)) + bp;
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#if (CHIP == INTEL)
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else if (INCSP2(off))
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off = bp + 2*INTSIZE;
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else if (POPBX2(off))
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off = bp + 2*INTSIZE;
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else if (POPCX2(off))
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off = bp + 2*INTSIZE;
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else if (POPBX(off))
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off = bp + INTSIZE;
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else if (POPCX(off))
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off = bp + INTSIZE;
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#endif
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else
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goto skiplp;
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#ifdef DEBUG
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if (debug)
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Printf("Number of arguments: %d\n",(off-bp)/INTSIZE);
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#endif
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for (;;) {
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if (errno) return;
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val = (ptrace(T_GETDATA, curpid, bp, 0L)
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>> SHIFT(INTSIZE)) & MASK(INTSIZE);
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Printf("0x%0*lx", 2 * INTSIZE, val);
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bp += INTSIZE;
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if (bp >= off) break;
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Printf(",");
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}
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skiplp:
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Printf(")\n");
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bp = (long) ( (reg_t) ptrace(T_GETDATA, curpid, obp, 0L) );
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#ifdef DEBUG
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if(debug)
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Printf("Old BP %lx New %lx\n",obp,bp);
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#endif
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}
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while (all && (reg_t) bp);
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}
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PRIVATE void modify(addr, cnt, verbose, size)
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long addr;
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int cnt, verbose, size;
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{
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long curval, off;
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if (curpid == 0) {
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Printf("No active process.\n");
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return;
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}
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curval = ptrace(T_GETDATA, curpid, addr, 0L) & MASK(size);
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do {
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if (cursig == SIGTRAP) cursig = 0;
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if (verbose) {
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off = get_reg(curpid, PC_OFF);
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dasm(off, 1, 0);
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}
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if (curpnt && exebpnt(cursig))
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return;
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else {
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ptrace(T_STEP, curpid, addr, 0L);
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switch (dowait()) {
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case 0:
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return;
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case SIGEMT:
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update();
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findbpnt(0);
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break;
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}
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}
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if (curval != ptrace(T_GETDATA, curpid, addr, 0L) & MASK(size)) {
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Printf("Modification detected\n");
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break;
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}
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}
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while (--cnt);
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update();
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dasm((long) PC_MEMBER(prc), 1, 1);
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return;
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}
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PRIVATE void display(addr, req)
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long addr;
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int req;
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{
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int count, size, out, shift;
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long val, msk;
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char fmt;
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if (curpid == 0) {
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Printf("No active process\n");
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return;
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}
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if (req == T_GETDATA && seg == T) req = T_GETINS;
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count = strtol(cmd, &cmd, 0);
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if (count == 0) count = 1;
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cmd = skip(cmd);
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if (*cmd == 'i' || *cmd == 'I') {
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dasm(addr, count, *cmd == 'i');
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return;
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}
|
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if (*cmd == 'y') {
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symbolic(addr, '\n');
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return;
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}
|
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switch (*cmd++) {
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case 'b': size = sizeof(char); break;
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case 'h': size = sizeof(short); break;
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case 'l': size = sizeof(long); break;
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default:
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size = sizeof(int);
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--cmd;
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break;
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}
|
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switch (fmt = *cmd) {
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case 'X':
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case 'D':
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size = sizeof(long);
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break;
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case 's':
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addr = ptrace(req, curpid, addr, 0L);
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req = T_GETDATA;
|
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/* Fallthrough */
|
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case 'a':
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case 'c':
|
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size = sizeof(char);
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break;
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}
|
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out = 0;
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msk = MASK(size);
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shift = SHIFT(size);
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do {
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val = (ptrace(req, curpid, addr, 0L) >> shift) & msk;
|
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if (out == 0) Printf("\n0x%0*lx: ", 2 * ADDRSIZE,
|
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(addr >> SHIFT(ADDRSIZE)) & MASK(ADDRSIZE));
|
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switch (fmt) {
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case 'c':
|
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Printf(isprint((int) (UCHAR(val))) ? " %c " : "\\%03o ",
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(int) (UCHAR(val)));
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if (++out == 8) out = 0;
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break;
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case 'u':
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Printf("%12lu ", val);
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if (++out == 4) out = 0;
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break;
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case 'x':
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case 'X':
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Printf("%*lx ", 2 * size, val);
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if (++out == (size == 4 ? 4 : 8)) out = 0;
|
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break;
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case 'o':
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Printf("%*lo ", 3 * size, val);
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if (++out == (size == 4 ? 4 : 8)) out = 0;
|
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break;
|
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case 's':
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case 'a':
|
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if (val)
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Printf("%c",val);
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else
|
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goto exitlp;
|
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if (++out == 64) out = 0;
|
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break;
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default:
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case 'd':
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case 'D':
|
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Printf("%12ld ", val);
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if (++out == 4) out = 0;
|
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break;
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}
|
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addr += size;
|
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}
|
|
while (--count > 0 || fmt == 's' || fmt == 'a');
|
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exitlp:
|
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Printf("\n");
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}
|
|
|
|
PRIVATE void fill(addr, req)
|
|
long addr;
|
|
int req;
|
|
{
|
|
int count, size, shift;
|
|
long val, msk, nval;
|
|
|
|
if (curpid == 0) {
|
|
Printf("No active process\n");
|
|
return;
|
|
}
|
|
|
|
if (req == T_GETDATA && seg == T) {
|
|
req = T_GETINS;
|
|
Printf("mdb: warning - modifying text\n");
|
|
}
|
|
count = strtol(cmd, &cmd, 0);
|
|
if ( count == 0 ) count = 1;
|
|
switch (*cmd++) {
|
|
case 'b': size = sizeof(char); break;
|
|
case 'h': size = sizeof(short); break;
|
|
case 'l': size = sizeof(long); break;
|
|
default:
|
|
size = sizeof(int);
|
|
--cmd;
|
|
break;
|
|
}
|
|
shift = SHIFT(size);
|
|
msk = MASK(size);
|
|
cmd = getexp(cmd, &nval, &seg);
|
|
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
Printf("Filling for Count=%d Size=%d val=%lx\n",count,size,nval);
|
|
#endif
|
|
|
|
nval <<= shift;
|
|
do {
|
|
val = ptrace(req, curpid, addr, 0L) | (nval & msk);
|
|
val &= (nval | ~msk);
|
|
ptrace(req + 3, curpid, addr, val);
|
|
addr += size;
|
|
}
|
|
while (--count > 0);
|
|
}
|
|
|
|
PRIVATE void not_for_core()
|
|
{
|
|
if (corepid > 0)
|
|
mdb_error("Illegal command for 'core' file\n");
|
|
}
|
|
|
|
PRIVATE void command()
|
|
{
|
|
char c, *p;
|
|
int i;
|
|
int size;
|
|
int stat;
|
|
long exp, lj, lk;
|
|
struct b_pnt *bp;
|
|
|
|
seg = NOSEG; /* don't restrict segment expressions are in */
|
|
cmdstart = cmd = skip(cmd);
|
|
cmd = getexp(cmd, &exp, &seg);
|
|
|
|
if (cmd == cmdstart) {
|
|
/* Not an expression */
|
|
if (corepid < 0) { /* default to pc for running processs */
|
|
seg = T;
|
|
exp = PC_MEMBER(prc);
|
|
} else {
|
|
seg = lastseg;
|
|
exp = lastexp;
|
|
}
|
|
|
|
/* Is it a help command */
|
|
cmd = skip(cmd+1);
|
|
if (*cmd == '?') {
|
|
help_on(*cmdstart);
|
|
*cmd = '\n';
|
|
return;
|
|
}
|
|
else
|
|
cmd = cmdstart;
|
|
}
|
|
|
|
if (seg == NOSEG) seg = T; /* Absolute becomes Text */
|
|
lastexp = exp; /* save last expression */
|
|
lastseg = seg;
|
|
#ifdef DEBUG
|
|
if(debug)
|
|
Printf("Current address 0x%0*lx and segment %d\n", 2 * ADDRSIZE, exp, seg);
|
|
|
|
#endif
|
|
|
|
/* Check commands */
|
|
switch (c = *cmd++) {
|
|
case 'r': /* illegal for 'core' files */
|
|
case 'R':
|
|
case 'k':
|
|
case 'B':
|
|
case 'd':
|
|
case 'D': not_for_core();
|
|
break;
|
|
|
|
case 'b': /* illegal for 'core' files */
|
|
case 'c': /* Otherwise run process first */
|
|
case 'C':
|
|
case 'm':
|
|
case 'M':
|
|
#if SYSCALLS_SUPPORT
|
|
case 'z':
|
|
#endif
|
|
case 'i':
|
|
case 'I': not_for_core();
|
|
if (curpid <= 0) dorun("\n");
|
|
break;
|
|
|
|
case 's': if (curpid <= 0) dorun("\n");
|
|
break;
|
|
|
|
default: break;
|
|
}
|
|
|
|
switch (c) {
|
|
case '!': /* escape to shell */
|
|
if (cmd == cmdstart + 1) {
|
|
cmd = skip(cmd);
|
|
if (*cmd == '\n' || *cmd == ';') {
|
|
i = run("/bin/sh", "\n", 0);
|
|
} else {
|
|
for (p = cmd + 1; *p && !isspace(*p); p++) {
|
|
};
|
|
*p++ = 0;
|
|
i = run(cmd, *p ? p : "\n", 0);
|
|
}
|
|
if (i > 0) while (wait(&stat) != i) {};
|
|
break;
|
|
}
|
|
if (corepid > 0) longjmp(mainlp, 0);
|
|
break;
|
|
case 'T': /* top line of backtrace */
|
|
backtrace(0);
|
|
break;
|
|
case 't': /* back trace */
|
|
backtrace(1);
|
|
break;
|
|
case '/': /* print variable value */
|
|
display(exp, T_GETDATA);
|
|
break;
|
|
case 'x': /* print registers and instruction */
|
|
if (disp_regs()) break;
|
|
/* FALLTHROUGH */
|
|
case 'X': /* print instruction - X n [, n] */
|
|
lj = strtol(cmd, &cmd, 0);
|
|
lk = 0;
|
|
if (*cmd != '\n')
|
|
lk = strtol(++cmd, &cmd, 0);
|
|
if (curpid > 0)
|
|
dasm(exp + lk, lj ? lj : 1, 1);
|
|
else
|
|
Printf("No active process.\n");
|
|
break;
|
|
case 'R': /* run program with no args */
|
|
case 'r': /* run program with args (possibly defaulted) */
|
|
tstart(T_EXIT, 0, 0, 0);
|
|
if (c == 'r') {
|
|
cmd = skip(cmd);
|
|
if (*cmd == '\n' || *cmd == ';')
|
|
cmd = sbuf;
|
|
else
|
|
strcpy(sbuf, cmd);
|
|
} else {
|
|
cmd = "\n";
|
|
}
|
|
dorun(cmd);
|
|
break;
|
|
case 'c': /* continue program - ignore signal */
|
|
cursig = 0;
|
|
case 'C': /* continue program - handle signal */
|
|
i = 0;
|
|
if (seg == T && curpnt == 0 && cmd != cmdstart + 1) {
|
|
breakpt(exp, "\n");
|
|
curpnt = b_head;
|
|
ptrace(T_SETINS, curpid, curpnt->addr, curpnt->oldval);
|
|
i = 1;
|
|
}
|
|
tstart(T_RESUME, 1, cursig, (int) strtol(cmd, &cmd, 0));
|
|
/* remove temporary bp */
|
|
if (i) freepnt(b_head);
|
|
if (cursig == SIGEMT) return;
|
|
if (curpid) Printf("Process stopped by signal %d\n", cursig);
|
|
break;
|
|
case 'i': /* single step - ignore signal */
|
|
tstart(T_STEP, 1, 0, (int) strtol(cmd, &cmd, 0));
|
|
break;
|
|
case 'I': /* single step - handle signal */
|
|
tstart(T_STEP, 1, cursig, (int) strtol(cmd, &cmd, 0));
|
|
break;
|
|
case 'm': /* single step until location modified */
|
|
case 'M': /* single step until location modified - verbose */
|
|
cmd = skip(cmd);
|
|
switch (*cmd++) {
|
|
case 'b': size = sizeof(char); break;
|
|
case 'h': size = sizeof(short); break;
|
|
case 'l': size = sizeof(long); break;
|
|
default:
|
|
size = sizeof(int);
|
|
--cmd;
|
|
break;
|
|
}
|
|
modify(exp, (int) strtol(cmd, &cmd, 0), c == 'M', size);
|
|
break;
|
|
case 'k': /* kill current program */
|
|
tstart(T_EXIT, 1, 0, 0);
|
|
break;
|
|
case 'b': /* set a breakpoint at the given line */
|
|
#ifdef MINIX_PC
|
|
if (seg != T || exp > end_addr ) {
|
|
#else
|
|
if (seg != T || exp < st_addr || exp > et_addr ) {
|
|
#endif
|
|
Printf("Address not in text space.\n");
|
|
return;
|
|
}
|
|
breakpt(exp, skip(cmd));
|
|
cmd = "\n";
|
|
return;
|
|
case 'B': /* print list of currently active breakpoints */
|
|
for (i = 1, bp = b_head; bp; bp = bp->nxt, i++) {
|
|
Printf("%2d: ", i);
|
|
symbolic((long) bp->addr, '\t');
|
|
Printf("(0x%lx)\t- %s", bp->addr, bp->cmd);
|
|
}
|
|
break;
|
|
case 'd': /* delete breakpoint */
|
|
if (seg == T) {
|
|
for (bp = b_head; bp && bp->addr != exp; bp = bp->nxt);
|
|
if (bp) {
|
|
freepnt(bp);
|
|
break;
|
|
}
|
|
}
|
|
Printf("No such breakpoint.\n");
|
|
break;
|
|
case 'D': /* delete all breakpoints */
|
|
while (b_head) freepnt(b_head);
|
|
break;
|
|
case 's':
|
|
dump_stack( strtol(cmd, &cmd, 0) );
|
|
break;
|
|
case 'P':
|
|
paging = !paging;
|
|
if (paging) Printf("Paging is ON\n");
|
|
break;
|
|
case 'l':
|
|
case 'L':
|
|
logging(c,skip(cmd));
|
|
break;
|
|
#if SYSCALLS_SUPPORT
|
|
case 'z':
|
|
start_syscall( strtol(cmd, &cmd, 0) );
|
|
if ( syscalls )
|
|
Printf("Break point set - use the 'c n' command\n");
|
|
break;
|
|
#endif
|
|
case 'q': /* quit */
|
|
tstart(T_EXIT, 0, 0, 0);
|
|
logging(c,cmd);
|
|
case 'Q':
|
|
exit(0);
|
|
break;
|
|
case '\n':
|
|
case ';':
|
|
if (isdigit(*cmdstart))
|
|
symbolic(exp, '\n');
|
|
else
|
|
Printf("0x%0*lx\n", 2 * ADDRSIZE, exp);
|
|
--cmd;
|
|
break;
|
|
#ifdef DEBUG
|
|
case 'v': /* toggle debug */
|
|
debug = !debug;
|
|
if (debug) Printf("Debug flag ON\n");
|
|
break;
|
|
#endif
|
|
case 'e': /* list symbols */
|
|
listsym(cmd);
|
|
break;
|
|
case 'y': /* print mapping */
|
|
prtmap();
|
|
break;
|
|
case '?': /* print help */
|
|
help_page();
|
|
break;
|
|
case 'V': /* print version info */
|
|
version_info();
|
|
break;
|
|
case '@': /* command file */
|
|
cmd = skip(cmd);
|
|
openin(cmd);
|
|
*cmd = '\n';
|
|
return;
|
|
case '#': /* set register or variable */
|
|
cmd = skip(cmd + 1);
|
|
if (*cmd == '$') {
|
|
cmd++;
|
|
i = reg_addr(cmd);
|
|
set_reg(curpid, i, strtol(cmd+2, &cmd, 0) );
|
|
update();
|
|
break;
|
|
}
|
|
cmd = getexp(cmd, &exp, &seg);
|
|
fill(exp, T_GETDATA);
|
|
break;
|
|
default:
|
|
help_page();
|
|
break;
|
|
}
|
|
while (*cmd != '\n' && *cmd != ';') ++cmd;
|
|
if (*cmd == ';') cmd = skip(cmd + 1);
|
|
}
|
|
|
|
PUBLIC void mdb_error(s)
|
|
char *s;
|
|
{
|
|
Printf("%s",s);
|
|
longjmp(mainlp, 0);
|
|
}
|
|
|
|
PUBLIC int main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int i, c;
|
|
char *p, *q, *r;
|
|
int opt_c = FALSE; /* load core file */
|
|
int opt_f = FALSE; /* load object file */
|
|
int opt_l = FALSE; /* log to file */
|
|
int opt_L = FALSE; /* log to file and screen */
|
|
|
|
|
|
prc = (struct proc *) lbuf;
|
|
strcpy(sbuf, "\n");
|
|
corepid = -1; /* set to indicate none */
|
|
prog = p = q = r = NULL;
|
|
|
|
if ( argc == 1 )
|
|
{
|
|
help_page();
|
|
exit(0);
|
|
}
|
|
|
|
/* Possible combinations of arguments:
|
|
* A single file name:
|
|
* If the name is 'core', the coreonly flag is set.
|
|
* The -c flag: examine a core file.
|
|
* One filename is required with this flag.
|
|
* The -f flag: examine an object file.
|
|
* One file name is required with this flag.
|
|
* The -L or -l flag: write to a log file.
|
|
* One file name is required with these flags.
|
|
* The -x flag: turn on debugging.
|
|
* Used for debugging, and followed by an integer
|
|
* argument which is the debugging level.
|
|
*
|
|
* If any files remain on the argument list, the first
|
|
* file is an executable, and the second a core file.
|
|
* If any filename starts with '@' it is assumed to
|
|
* to be a command file. Only one command file is
|
|
* loaded.
|
|
*/
|
|
|
|
/* check for default file name and fake out getopt */
|
|
if (strcmp(argv[1], "core") == 0) {
|
|
for (i = argc ; i > 1 ; i--)
|
|
argv[i] = argv[i - 1];
|
|
argv[i] = "-c";
|
|
argc++;
|
|
}
|
|
|
|
/* parse options */
|
|
opterr = 0;
|
|
while ((i = getopt(argc, argv, "c:f:L:l:x:")) != EOF) {
|
|
switch (i & 0377) {
|
|
case 'c': /* examine a core file */
|
|
if (opt_c == TRUE || opt_f == TRUE) {
|
|
help_page();
|
|
exit(1);
|
|
}
|
|
p = optarg;
|
|
opt_c = TRUE;
|
|
break;
|
|
case 'f': /* examine an object file */
|
|
if (opt_c == TRUE || opt_f == TRUE) {
|
|
help_page();
|
|
exit(1);
|
|
}
|
|
p = optarg;
|
|
opt_f = TRUE;
|
|
break;
|
|
case 'l': /* start logging */
|
|
if (opt_l == TRUE || opt_L == TRUE) {
|
|
help_page();
|
|
exit(1);
|
|
}
|
|
opt_l = TRUE;
|
|
logging(i, optarg);
|
|
break;
|
|
case 'L': /* start logging */
|
|
if (opt_l == TRUE || opt_L == TRUE) {
|
|
help_page();
|
|
exit(1);
|
|
}
|
|
opt_L = TRUE;
|
|
logging(i, optarg);
|
|
break;
|
|
#ifdef DEBUG
|
|
case 'x': /* set debug level */
|
|
debug = atoi(optarg);
|
|
break;
|
|
#endif
|
|
case '?': /* default arguments arrive here */
|
|
default:
|
|
help_page();
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* can't cope without filenames */
|
|
if (!opt_c && !opt_f && optind >= argc) {
|
|
help_page();
|
|
exit(1);
|
|
}
|
|
|
|
/* any remaining arguments are (optional) file names */
|
|
for (i = optind ; i < argc ; i++) {
|
|
if (*argv[i] == '@') { /* command file */
|
|
if (r == NULL) r = argv[i] + 1;
|
|
}
|
|
/* you can't combine a -c or -f object file and a core file */
|
|
else if (!opt_c && !opt_f && p == NULL) p = argv[i];
|
|
else if (q == NULL) q = argv[i]; /* core file */
|
|
}
|
|
|
|
/* initialise stuff - fairly tricky logic */
|
|
coreonly = opt_c;
|
|
fileonly = opt_f;
|
|
/* when examining files, prog == NULL */
|
|
if (!opt_c && !opt_f) {
|
|
prog = p;
|
|
syminit(prog);
|
|
}
|
|
|
|
/* file_init is called for non-core files.
|
|
* It is very similar to core_init. It opens the file and set
|
|
* various pointers so that we can read it using the same routines
|
|
* as a core file.
|
|
* NB: Currently there is no special provision to handle object files.
|
|
*/
|
|
|
|
/* A comment from Will Rose:
|
|
* It would be nice to have
|
|
* symbol tables available when reading a core
|
|
* or a.out, either as part of the executable or
|
|
* as a separate file.
|
|
* At least three separate types of file structure
|
|
* may be used by mdb - core files, a.out files, and
|
|
* object files (which may have several flavours).
|
|
* A set of routines is needed for each type, with
|
|
* a function switch table initialised when mdb is
|
|
* started up.
|
|
*/
|
|
|
|
if (opt_c) lastexp = core_init(p);
|
|
if (opt_f) lastexp = file_init(p);
|
|
if (q != NULL) lastexp = core_init(q);
|
|
if (r != NULL) openin(r);
|
|
for (i = 1; i < _NSIG; i++) signal(i, catch);
|
|
|
|
setjmp(mainlp);
|
|
|
|
while (get_cmd( cbuf, MAXLINE ) != NULL) {
|
|
if (strlen(cbuf) == sizeof(cbuf) - 1) {
|
|
Printf("Command line too long.\n");
|
|
continue;
|
|
}
|
|
cmd = cbuf;
|
|
command();
|
|
while (*cmd != '\n') command();
|
|
}
|
|
tstart(T_EXIT, 0, 0, 0);
|
|
exit(0);
|
|
}
|