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chk: fix some locking

--- a/arm.c

+++ b/arm.c

@@ -38,6 +38,8 @@

 	u32int a;

 	a = *(u32int*) vaddrnol(P->R[13] + 4 + 4 * n, 4, ARD);

+	if(a == 0)

+		return ~0;

 	return *(ulong*) vaddrnol(a-4, 4, ARD);

 }

--- a/chk.c

+++ b/chk.c

@@ -23,7 +23,7 @@

 		print("not tracing\n");

 		return;

 	}

-	for(i = (off&~0x4095)/8; i < (seg->size + 7)/8; i++){

+	for(i = (off&~0x4095)/8; i <= (seg->size + 7)/8; i++){

 		if(i % 40 == 0)

 			p = seprint(p, e, "\n[%04x] ", seg->start+i*8);

 		p = seprint(p, e, "%02ux", seg->shadow[i]);

@@ -93,6 +93,7 @@

 	markinvalid(seg, p - (uchar*)seg->data, av[0]);

 	if(mallocverbose)

 		dumpmap(seg, p-(uchar*)seg->start, "postmalloc");

+	segunlock(seg);

 }

@@ -102,23 +103,25 @@

 	uchar *oldp, *newp;

 	u32int oldsz, newsz, sz;

 	u32int oldoff, newoff;

-	Segment *seg;

+	Segment *seg0, *seg1;

-	oldp = vaddr(av[0], 0, 0, &seg);

-	newp = vaddr(P->R[0], 0, 0, &seg);

+	oldp = vaddr(av[0], 0, 0, &seg0);

+	newp = vaddr(P->R[0], 0, 0, &seg1);

 	oldsz = av[1];

 	newsz = av[2];

-	oldoff = oldp - (uchar*)seg->data;

-	newoff = newp - (uchar*)seg->data;

+	oldoff = oldp - (uchar*)seg0->data;

+	newoff = newp - (uchar*)seg1->data;

 	sz = (oldsz < newsz) ? oldsz : newsz;

 	if(mallocverbose)

-		dumpmap(seg, oldp-(uchar*)seg->start, "realloc %#x+%d => %#x+%d\n", av[0], av[1], P->R[0], av[2]);

+		dumpmap(seg0, oldp-(uchar*)seg0->start, "realloc %#x+%d => %#x+%d\n", av[0], av[1], P->R[0], av[2]);

 	if(oldp != newp)

-		memcpy(seg->shadow+oldoff/8, seg->shadow+newoff/8, (sz+7)/8);

+		memcpy(seg1->shadow+oldoff/8, seg0->shadow+newoff/8, (sz+7)/8);

 	if(newsz > oldsz)

-		markinvalid(seg, oldoff+oldsz, newsz-oldsz);

+		markinvalid(seg0, oldoff+oldsz, newsz-oldsz);

 	if(mallocverbose)

-		dumpmap(seg, newp-(uchar*)seg->start, "postrealloc");

+		dumpmap(seg1, newp-(uchar*)seg1->start, "postrealloc");

+	segunlock(seg0);

+	segunlock(seg1);

 }

 void

@@ -133,4 +136,5 @@

 	markinvalid(seg, p - (uchar*)seg->data, av[1]);

 	if(mallocverbose)

 		dumpmap(seg, p-(uchar*)seg->start, "postfree");

+	segunlock(seg);

 }