cmd/ld: handle large link base addresses

codeblk and datblk were truncating their
arguments to int32. Don't do that.

LGTM=dvyukov, rminnich
R=iant, dvyukov, rminnich
CC=golang-codereviews
https://golang.org/cl/126050043

src/cmd/ld/data.c

@@ -425,10 +425,10 @@ dynreloc(void)
 }
 
 static void
-blk(LSym *start, int32 addr, int32 size)
+blk(LSym *start, int64 addr, int64 size)
 {
 	LSym *sym;
-	int32 eaddr;
+	int64 eaddr;
 	uchar *p, *ep;
 
 	for(sym = start; sym != nil; sym = sym->next)
@@ -467,10 +467,10 @@ blk(LSym *start, int32 addr, int32 size)
 }
 
 void
-codeblk(int32 addr, int32 size)
+codeblk(int64 addr, int64 size)
 {
 	LSym *sym;
-	int32 eaddr, n;
+	int64 eaddr, n;
 	uchar *q;
 
 	if(debug['a'])
@@ -527,10 +527,10 @@ codeblk(int32 addr, int32 size)
 }
 
 void
-datblk(int32 addr, int32 size)
+datblk(int64 addr, int64 size)
 {
 	LSym *sym;
-	int32 i, eaddr;
+	int64 i, eaddr;
 	uchar *p, *ep;
 	char *typ, *rsname;
 	Reloc *r;

src/cmd/ld/lib.h

@@ -184,11 +184,11 @@ uint32	be32(uchar *b);
 uint64	be64(uchar *b);
 void	callgraph(void);
 void	cflush(void);
-void	codeblk(int32 addr, int32 size);
+void	codeblk(int64 addr, int64 size);
 vlong	cpos(void);
 void	cseek(vlong p);
 void	cwrite(void *buf, int n);
-void	datblk(int32 addr, int32 size);
+void	datblk(int64 addr, int64 size);
 int	datcmp(LSym *s1, LSym *s2);
 vlong	datoff(vlong addr);
 void	deadcode(void);