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arm: hook sbrk too

--- a/arm.c

+++ b/arm.c

@@ -22,6 +22,7 @@

 u32int mallocaddr;

 u32int freeaddr;

 u32int reallocaddr;

+u32int sbrkaddr;

 u32int setmalloctagaddr;

 u32int setrealloctagaddr;

@@ -325,7 +326,7 @@

 	npc = P->R[15] + offset + 4;

 	if(instr & fLi){

 		P->R[14] = P->R[15];

-		if(check){

+		if(check && P->hookpc == 0){

 			if(npc == mallocaddr){

 				P->hookarg[0] = arg(1);	/* size */

 				P->hookfn = hookmalloc;

@@ -338,6 +339,11 @@

 				P->hookpc = P->R[15];

 			}else if(npc == freeaddr){

 				P->hookarg[0] = arg(1);

+				P->hookarg[1] = asize(1);

+				P->hookfn = hookfree;

+				P->hookpc = P->R[15];

+			}else if(npc == sbrkaddr){

+				P->hookarg[0] = arg(0);

 				P->hookarg[1] = asize(1);

 				P->hookfn = hookfree;

 				P->hookpc = P->R[15];

--- a/dat.h

+++ b/dat.h

@@ -78,6 +78,7 @@

 extern u32int mallocaddr;

 extern u32int freeaddr;

 extern u32int reallocaddr;

+extern u32int sbrkaddr;

 extern u32int setmalloctagaddr;

 extern u32int setrealloctagaddr;

 extern uvlong okrange[];