* a.out.gnu.h, a.out.sun4.h: Make SEGMENT_SIZE able to depend

on the particular a.out being examined.
* a.out.sun4.h:  Define segment sizes for Sun-3's and Sun-4's.
* FIXME:  a.out.gnu.h is almost obsolete.
* FIXME:  a.out.sun4.h should be renamed a.out.sun.h now.

gas/a.out.gnu.h

@@ -100,9 +100,15 @@ enum machine_type {
   			&& N_MAGIC(x) != ZMAGIC)
 #endif
 
+/* By default, segment size is constant.  But on some machines, it can
+   be a function of the a.out header (e.g. machine type).  */
+#ifndef	N_SEGSIZE
+#define	N_SEGSIZE(x)	SEGMENT_SIZE
+#endif
+
 /* This complexity is for encapsulated COFF support */
 #ifndef _N_HDROFF
-#define _N_HDROFF(x)	(SEGMENT_SIZE - sizeof (struct exec))
+#define _N_HDROFF(x)	(N_SEGSIZE(x) - sizeof (struct exec))
 #endif
 
 #ifndef N_TXTOFF
@@ -140,7 +146,7 @@ enum machine_type {
 #ifndef N_DATADDR
 #define N_DATADDR(x) \
     (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
-     :  (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))))
+     :  (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
 #endif
 
 /* Address of bss segment in memory after it is loaded.  */

include/a.out.sun4.h

@@ -2,11 +2,20 @@
 
 #define PAGE_SIZE	0x2000		/* 8K.  aka NBPG in <sys/param.h> */
 /* Note that some SPARCs have 4K pages, some 8K, some others.  */
-#define SEGMENT_SIZE	PAGE_SIZE
+
+#define SEG_SIZE_SPARC	PAGE_SIZE
+#define	SEG_SIZE_SUN3	0x80000		/* Resolution of r/w protection hw */
+
 #define TEXT_START_ADDR	PAGE_SIZE	/* Location 0 is not accessible */
 
 /* Non-default definitions of the accessor macros... */
 
+/* Segment size varies on Sun-3 versus Sun-4.  */
+
+#define N_SEGSIZE(x)	(N_MACHTYPE(x) == M_SPARC?	SEG_SIZE_SPARC:	\
+			 N_MACHTYPE(x) == M_68020?	SEG_SIZE_SUN3:	\
+			/* Guess? */			PAGE_SIZE)
+
 /* Offset in a.out file of the text section.  For ZMAGIC, the text section
    actually includes the a.out header.  */
 

include/aout64.h

@@ -72,7 +72,13 @@ enum machine_type {
 ((exec).a_info = \
  ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
 
-#define _N_HDROFF(x)	(SEGMENT_SIZE - EXEC_BYTES_SIZE)
+/* By default, segment size is constant.  But on some machines, it can
+   be a function of the a.out header (e.g. machine type).  */
+#ifndef	N_SEGSIZE
+#define	N_SEGSIZE(x)	SEGMENT_SIZE
+#endif
+
+#define _N_HDROFF(x)	(N_SEGSIZE(x) - EXEC_BYTES_SIZE)
 /* address in an a.out of the text section. When demand paged, it's
  set up a bit to make nothing at 0, when an object file it's 0.
  There's a special hack case when the entry point is < TEXT_START_ADDR
@@ -111,7 +117,7 @@ enum machine_type {
 
 #define N_DATADDR(x) \
     (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
-     :  (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))))
+     :  (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
 
 #define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)