+#
+/*
+ *
+ * UNIX debugger
+ *
+ */
+
+#include "defs.h"
+SCCSID(@(#)runpcs.c 2.7);
+struct user u;
+
+
+MSG NOFORK;
+MSG ENDPCS;
+MSG BADWAIT;
+
+CHAR *lp;
+ADDR sigint;
+ADDR sigqit;
+
+/* breakpoints */
+BKPTR bkpthead;
+
+REGLIST reglist[];
+
+CHAR lastc;
+
+INT fcor;
+INT fsym;
+STRING errflg;
+INT errno;
+INT signo;
+
+L_INT dot;
+STRING symfil;
+INT wtflag;
+L_INT pid;
+L_INT expv;
+INT adrflg;
+L_INT loopcnt;
+
+
+
+
+
+/* service routines for sub process control */
+
+getsig(sig)
+{ return(expr(0) ? expv : sig);
+}
+
+ADDR userpc = 1;
+
+runpcs(runmode,execsig)
+{
+ INT rc;
+ REG BKPTR bkpt;
+ IF adrflg THEN userpc=dot; FI
+ printf("%s: running\n", symfil);
+
+ WHILE --loopcnt>=0
+ DO
+#ifdef DEBUG
+ printf("\ncontinue %x %d\n",userpc,execsig);
+#endif
+ IF runmode==SINGLE
+ THEN delbp(); /* hardware handles single-stepping */
+ ELSE /* continuing from a breakpoint is hard */
+ IF bkpt=scanbkpt(userpc)
+ THEN execbkpt(bkpt,execsig); execsig=0;
+ FI
+ setbp();
+ FI
+ ptrace(runmode,pid,userpc,execsig);
+ bpwait(); chkerr(); execsig=0; delbp(); readregs();
+
+ IF (signo==0) ANDF (bkpt=scanbkpt(userpc))
+ THEN /* stopped by BPT instruction */
+#ifdef DEBUG
+ printf("\n BPT code; '%s'%o'%o'%d",
+ bkpt->comm,bkpt->comm[0],EOR,bkpt->flag);
+#endif
+ dot=bkpt->loc;
+ IF bkpt->flag==BKPTEXEC
+ ORF ((bkpt->flag=BKPTEXEC)
+ ANDF bkpt->comm[0]!=EOR
+ ANDF command(bkpt->comm,':')
+ ANDF --bkpt->count)
+ THEN execbkpt(bkpt,execsig); execsig=0; loopcnt++;
+ ELSE bkpt->count=bkpt->initcnt; rc=1;
+ FI
+ ELSE execsig=signo; rc=0;
+ FI
+ OD
+ return(rc);
+}
+
+#define BPOUT 0
+#define BPIN 1
+INT bpstate = BPOUT;
+
+endpcs()
+{
+ REG BKPTR bkptr;
+ IF pid
+ THEN ptrace(EXIT,pid,0,0); pid=0; userpc=1;
+ FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt
+ DO IF bkptr->flag
+ THEN bkptr->flag=BKPTSET;
+ FI
+ OD
+ FI
+ bpstate=BPOUT;
+}
+
+#ifdef VFORK
+nullsig()
+{
+
+}
+#endif
+
+setup()
+{
+ close(fsym); fsym = -1;
+#ifndef VFORK
+ IF (pid = fork()) == 0
+#else
+ IF (pid = vfork()) == 0
+#endif
+ THEN ptrace(SETTRC,0,0,0);
+#ifdef VFORK
+ signal(SIGTRC,nullsig);
+#endif
+ signal(SIGINT,sigint); signal(SIGQUIT,sigqit);
+ doexec(); exit(0);
+ ELIF pid == -1
+ THEN error(NOFORK);
+ ELSE bpwait(); readregs(); lp[0]=EOR; lp[1]=0;
+ fsym=open(symfil,wtflag);
+ IF errflg
+ THEN printf("%s: cannot execute\n",symfil);
+ endpcs(); error(0);
+ FI
+ FI
+ bpstate=BPOUT;
+}
+
+execbkpt(bkptr,execsig)
+BKPTR bkptr;
+{
+#ifdef DEBUG
+ printf("exbkpt: %d\n",bkptr->count);
+#endif
+ delbp();
+ ptrace(SINGLE,pid,bkptr->loc,execsig);
+ bkptr->flag=BKPTSET;
+ bpwait(); chkerr(); readregs();
+}
+
+
+doexec()
+{
+ STRING argl[MAXARG];
+ CHAR args[LINSIZ];
+ STRING p, *ap, filnam;
+ extern STRING environ;
+ ap=argl; p=args;
+ *ap++=symfil;
+ REP IF rdc()==EOR THEN break; FI
+ *ap = p;
+ WHILE lastc!=EOR ANDF lastc!=SP ANDF lastc!=TB DO *p++=lastc; readchar(); OD
+ *p++=0; filnam = *ap+1;
+ IF **ap=='<'
+ THEN close(0);
+ IF open(filnam,0)<0
+ THEN printf("%s: cannot open\n",filnam); _exit(0);
+ FI
+ ELIF **ap=='>'
+ THEN close(1);
+ IF creat(filnam,0666)<0
+ THEN printf("%s: cannot create\n",filnam); _exit(0);
+ FI
+ ELSE ap++;
+ FI
+ PER lastc!=EOR DONE
+ *ap++=0;
+ exect(symfil, argl, environ);
+ perror(symfil);
+}
+
+BKPTR scanbkpt(adr)
+ADDR adr;
+{
+ REG BKPTR bkptr;
+ FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt
+ DO IF bkptr->flag ANDF bkptr->loc==adr
+ THEN break;
+ FI
+ OD
+ return(bkptr);
+}
+
+delbp()
+{
+ REG ADDR a;
+ REG BKPTR bkptr;
+ IF bpstate!=BPOUT
+ THEN
+ FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt
+ DO IF bkptr->flag
+ THEN a=bkptr->loc;
+ ptrace(WIUSER,pid,a,
+ (bkptr->ins&0xFF)|(ptrace(RIUSER,pid,a,0)&~0xFF));
+ FI
+ OD
+ bpstate=BPOUT;
+ FI
+}
+
+setbp()
+{
+ REG ADDR a;
+ REG BKPTR bkptr;
+
+ IF bpstate!=BPIN
+ THEN
+ FOR bkptr=bkpthead; bkptr; bkptr=bkptr->nxtbkpt
+ DO IF bkptr->flag
+ THEN a = bkptr->loc;
+ bkptr->ins = ptrace(RIUSER, pid, a, 0);
+ ptrace(WIUSER, pid, a, BPT | (bkptr->ins&~0xFF));
+ IF errno
+ THEN prints("cannot set breakpoint: ");
+ psymoff(bkptr->loc,ISYM,"\n");
+ FI
+ FI
+ OD
+ bpstate=BPIN;
+ FI
+}
+
+bpwait()
+{
+ REG ADDR w;
+ ADDR stat;
+
+ signal(SIGINT, 1);
+ WHILE (w = wait(&stat))!=pid ANDF w != -1 DONE
+ signal(SIGINT,sigint);
+ IF w == -1
+ THEN pid=0;
+ errflg=BADWAIT;
+ ELIF (stat & 0177) != 0177
+ THEN IF signo = stat&0177
+ THEN sigprint();
+ FI
+ IF stat&0200
+ THEN prints(" - core dumped");
+ close(fcor);
+ setcor();
+ FI
+ pid=0;
+ errflg=ENDPCS;
+ ELSE signo = stat>>8;
+ IF signo!=SIGTRC
+ THEN sigprint();
+ ELSE signo=0;
+ FI
+ flushbuf();
+ FI
+}
+
+readregs()
+{
+ /*get REG values from pcs*/
+ REG i;
+ FOR i=24; --i>=0;
+ DO *(ADDR *)(((ADDR)&u)+reglist[i].roffs) =
+ ptrace(RUREGS, pid, reglist[i].roffs, 0);
+ OD
+ userpc= *(ADDR *)(((ADDR)&u)+PC);
+}
+
+
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