cmd/ld: Put the textflag constants in a separate file.

We can then include this file in assembly to replace
cryptic constants like "7" with meaningful constants
like "(NOPROF|DUPOK|NOSPLIT)".

Converting just pkg/runtime/asm*.s for now.  Dropping NOPROF
and DUPOK from lots of places where they aren't needed.
More .s files to come in a subsequent changelist.

A nonzero number in the textflag field now means
"has not been converted yet".

R=golang-dev, daniel.morsing, rsc, khr
CC=golang-dev
https://codereview.appspot.com/12568043

4 files changed, 22 insertions, 16 deletions

diff --git a/src/cmd/5l/5.out.h b/src/cmd/5l/5.out.h
index eda379c6f..85dd17a8e 100644
--- a/src/cmd/5l/5.out.h
+++ b/src/cmd/5l/5.out.h
@@ -31,12 +31,7 @@
 #define	NSNAME		8
 #define	NSYM		50
 #define	NREG		16
-
-#define NOPROF		(1<<0)
-#define DUPOK		(1<<1)
-#define NOSPLIT		(1<<2)
-#define RODATA	(1<<3)
-#define NOPTR	(1<<4)
+#include "../ld/textflag.h"
 
 #define	REGRET		0
 /* -1 disables use of REGARG */
diff --git a/src/cmd/6l/6.out.h b/src/cmd/6l/6.out.h
index b95b3fd13..b96be6024 100644
--- a/src/cmd/6l/6.out.h
+++ b/src/cmd/6l/6.out.h
@@ -30,11 +30,7 @@
 
 #define	NSYM	50
 #define	NSNAME	8
-#define NOPROF	(1<<0)
-#define DUPOK	(1<<1)
-#define NOSPLIT	(1<<2)
-#define RODATA	(1<<3)
-#define NOPTR	(1<<4)
+#include "../ld/textflag.h"
 
 /*
  *	amd64
diff --git a/src/cmd/8l/8.out.h b/src/cmd/8l/8.out.h
index 7683d50ad..a804ae94b 100644
--- a/src/cmd/8l/8.out.h
+++ b/src/cmd/8l/8.out.h
@@ -30,11 +30,7 @@
 
 #define	NSYM	50
 #define	NSNAME	8
-#define NOPROF	(1<<0)
-#define DUPOK	(1<<1)
-#define NOSPLIT	(1<<2)
-#define RODATA	(1<<3)
-#define NOPTR	(1<<4)
+#include "../ld/textflag.h"
 
 enum	as
 {
diff --git a/src/cmd/ld/textflag.h b/src/cmd/ld/textflag.h
new file mode 100644
index 000000000..7b16865be
--- /dev/null
+++ b/src/cmd/ld/textflag.h
@@ -0,0 +1,19 @@
+// Copyright 2013 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file defines flags attached to various functions
+// and data objects.  The compilers, assemblers, and linker must
+// all agree on these values.
+
+// Don't profile the marked routine.  This flag is deprecated.
+#define NOPROF	(1<<0)
+// It is ok for the linker to get multiple of these symbols.  It will
+// pick one of the duplicates to use.
+#define DUPOK	(1<<1)
+// Don't insert stack check preamble.
+#define NOSPLIT	(1<<2)
+// Put this data in a read-only section.
+#define RODATA	(1<<3)
+// This data contains no pointers.
+#define NOPTR	(1<<4)