debugger

src/cmd/db/runpcs.c

@@ -0,0 +1,205 @@
+/*
+ *
+ *	debugger
+ *
+ */
+
+#include "defs.h"
+#include "fns.h"
+
+BKPT *bkpthead;
+
+BOOL bpin;
+
+int pid;
+int nnote;
+int ending;
+char note[NNOTE][ERRMAX];
+
+/* service routines for sub process control */
+
+int
+runpcs(int runmode, int keepnote)
+{
+	int rc;
+	BKPT *bkpt;
+	ADDR x;
+
+	rc = 0;
+	if (adrflg)
+		rput(correg, mach->pc, dot);
+	if(rget(correg, mach->pc, &dot) < 0)
+		error("%r");
+	flush();
+	while (--loopcnt >= 0) {
+		if(loopcnt != 0)
+			printpc();
+		if (runmode == SINGLE) {
+			bkpt = scanbkpt(dot);
+			if (bkpt) {
+				switch(bkpt->flag){
+				case BKPTTMP:
+					bkpt->flag = BKPTCLR;
+					break;
+				case BKPTSKIP:
+					bkpt->flag = BKPTSET;
+					break;
+				}
+			}
+			runstep(dot, keepnote);
+		} else {
+			if(rget(correg, mach->pc, &x) < 0)
+				error("%r");
+			if ((bkpt = scanbkpt(x)) != 0) {
+				execbkpt(bkpt, keepnote);
+				keepnote = 0;
+			}
+			setbp();
+			runrun(keepnote);
+		}
+		keepnote = 0;
+		delbp();
+		if(rget(correg, mach->pc, &dot) < 0)
+			error("%r");
+		/* real note? */
+		if (nnote > 0) {
+			keepnote = 1;
+			rc = 0;
+			continue;
+		}
+		bkpt = scanbkpt(dot);
+		if(bkpt == 0){
+			keepnote = 0;
+			rc = 0;
+			continue;
+		}
+		/* breakpoint */
+		if (bkpt->flag == BKPTTMP)
+			bkpt->flag = BKPTCLR;
+		else if (bkpt->flag == BKPTSKIP) {
+			execbkpt(bkpt, keepnote);
+			keepnote = 0;
+			loopcnt++;	/* we didn't really stop */
+			continue;
+		}
+		else {
+			bkpt->flag = BKPTSKIP;
+			--bkpt->count;
+			if ((bkpt->comm[0] == EOR || command(bkpt->comm, ':') != 0)
+			&&  bkpt->count != 0) {
+				execbkpt(bkpt, keepnote);
+				keepnote = 0;
+				loopcnt++;
+				continue;
+			}
+			bkpt->count = bkpt->initcnt;
+		}
+		rc = 1;
+	}
+	return(rc);
+}
+
+/*
+ * finish the process off;
+ * kill if still running
+ */
+
+void
+endpcs(void)
+{
+	BKPT *bk;
+
+	if(ending)
+		return;
+	ending = 1;
+	if (pid) {
+		if(pcsactive){
+			killpcs();
+			pcsactive = 0;
+		}
+		pid=0;
+		nnote=0;
+		for (bk=bkpthead; bk; bk = bk->nxtbkpt)
+			if (bk->flag == BKPTTMP)
+				bk->flag = BKPTCLR;
+			else if (bk->flag != BKPTCLR)
+				bk->flag = BKPTSET;
+	}
+	bpin = FALSE;
+	ending = 0;
+}
+
+/*
+ * start up the program to be debugged in a child
+ */
+
+void
+setup(void)
+{
+
+	nnote = 0;
+	startpcs();
+	bpin = FALSE;
+	pcsactive = 1;
+}
+
+/*
+ * skip over a breakpoint:
+ * remove breakpoints, then single step
+ * so we can put it back
+ */
+void
+execbkpt(BKPT *bk, int keepnote)
+{
+	runstep(bk->loc, keepnote);
+	bk->flag = BKPTSET;
+}
+
+/*
+ * find the breakpoint at adr, if any
+ */
+
+BKPT *
+scanbkpt(ADDR adr)
+{
+	BKPT *bk;
+
+	for (bk = bkpthead; bk; bk = bk->nxtbkpt)
+		if (bk->flag != BKPTCLR && bk->loc == adr)
+			break;
+	return(bk);
+}
+
+/*
+ * remove all breakpoints from the process' address space
+ */
+
+void
+delbp(void)
+{
+	BKPT *bk;
+
+	if (bpin == FALSE || pid == 0)
+		return;
+	for (bk = bkpthead; bk; bk = bk->nxtbkpt)
+		if (bk->flag != BKPTCLR)
+			bkput(bk, 0);
+	bpin = FALSE;
+}
+
+/*
+ * install all the breakpoints
+ */
+
+void
+setbp(void)
+{
+	BKPT *bk;
+
+	if (bpin == TRUE || pid == 0)
+		return;
+	for (bk = bkpthead; bk; bk = bk->nxtbkpt)
+		if (bk->flag != BKPTCLR)
+			bkput(bk, 1);
+	bpin = TRUE;
+}