From 30c52cdf23c167bb7e6ba3c9770852746b3b2dbc Mon Sep 17 00:00:00 2001
From: John Gilmore <gnu@cygnus>
Date: Fri, 20 Sep 1991 21:50:27 +0000
Subject: [PATCH] Update N_FN value to 0x1F.  Add comments about N_EXT bits.

---
 gas/a.out.gnu.h  |  5 ++++-
 include/aout64.h |  5 ++++-
 include/stab.def | 13 +++++++++++--
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/gas/a.out.gnu.h b/gas/a.out.gnu.h
index 3833d7162b2..9ce531d9f55 100755
--- a/gas/a.out.gnu.h
+++ b/gas/a.out.gnu.h
@@ -169,9 +169,12 @@ struct nlist {
 #define N_TEXT 4
 #define N_DATA 6
 #define N_BSS 8
-#define N_FN 0xe
 #define	N_COMM	0x12		/* common (visible in shared lib commons) */
+#define N_FN 0x1F		/* File name of a .o file */
 
+/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
+   N_DATA, or N_BSS.  When the low-order bit of other types is set,
+   (e.g. N_WARNING versus N_FN), they are two different types.  */
 #define N_EXT 1
 #define N_TYPE 036
 #define N_STAB 0340
diff --git a/include/aout64.h b/include/aout64.h
index 9edb7d35ab3..e25770d4964 100755
--- a/include/aout64.h
+++ b/include/aout64.h
@@ -175,8 +175,11 @@ struct internal_nlist {
 #define N_TEXT 	4
 #define N_DATA 	6
 #define N_BSS 	8
-#define N_FN	0x0e
 #define	N_COMM	0x12	/* Common symbol (visible after shared lib dynlink) */
+#define N_FN	0x1f	/* File name of .o file */
+/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT,
+   N_DATA, or N_BSS.  When the low-order bit of other types is set,
+   (e.g. N_WARNING versus N_FN), they are two different types.  */
 #define N_EXT 	1
 #define N_TYPE  0x1e
 #define N_STAB 	0xe0
diff --git a/include/stab.def b/include/stab.def
index 8c5e5fe97b8..005dd75bdcd 100755
--- a/include/stab.def
+++ b/include/stab.def
@@ -171,11 +171,20 @@ __define_stab (N_LENG, 0xfe, "LENG")
 			STAB MATRIX
 	_________________________________________________
 	| 00 - 1F are not dbx stab symbols		|
-	| Entries with bit 01 set are external symbols. |
+	| In most cases, the low bit is the EXTernal bit|
+
 	| 00 UNDEF  | 02 ABS	| 04 TEXT   | 06 DATA	|
-	| 08 BSS    | 0A INDR	| 0C 	    | 0E FN	|
+	| 01  |EXT  | 03  |EXT	| 05  |EXT  | 07  |EXT	|
+
+	| 08 BSS    | 0A INDR	| 0C 	    | 0E   	|
+	| 09  |EXT  | 0B 	| 0D	    | 0F	|
+
 	| 10 	    | 12 COMM	| 14 SETA   | 16 SETT	|
+	| 11	    | 13	| 15 	    | 17	|
+
 	| 18 SETD   | 1A SETB	| 1C SETV   | 1E WARNING|
+	| 19	    | 1B	| 1D 	    | 1F FN	|
+
 	|_______________________________________________|
 	| Debug entries with bit 01 set are unused.	|
 	| 20 GSYM   | 22 FNAME	| 24 FUN    | 26 STSYM	|
-- 
2.30.2