Update of /cvsroot/linux-vax/kernel-2.5/Documentation/vax
In directory sc8-pr-cvs1:/tmp/cvs-serv22378/Documentation/vax
Modified Files:
assembler.txt
Log Message:
Document new assembler syntax
Index: assembler.txt
===================================================================
RCS file: /cvsroot/linux-vax/kernel-2.5/Documentation/vax/assembler.txt,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- assembler.txt 20 May 2002 00:33:29 -0000 1.3
+++ assembler.txt 18 Jun 2003 23:02:48 -0000 1.4
@@ -1,24 +1,33 @@
-The GNU assembler in Andy's cross compilation tool set is a little
+The GNU assembler in our cross compilation tool set is a little
different from DEC's MACRO32 assembler. This file summarises the
differences.
+1. Register names are prefixed with %
-1. #, ^ and @ become $, ` and *
+ In VAX MACRO you might write:
+
+ movl #0, r0
+
+ In gas, these are written:
+
+ movl $0, %r0
+
+2. #, ^ and @ become $, ` and *
In VAX MACRO you might write:
- movl #0, 8(r5)
+ movl #0, r0
movl #0, @8(r5)
movl #0, L^8(r5)
In gas, these are written:
- movl $0, r0
- movl $0, *8(r5)
- movl $0, L`8(r5)
+ movl $0, %r0
+ movl $0, *8(%r5)
+ movl $0, L`8(%r5)
-2. ^X becomes 0x
+3. ^X becomes 0x
Hex constants are prefixed with 0x, rather than ^x
Similarly, a leading zero not followed by an x implies octal.
@@ -32,7 +41,7 @@
gas:
- movl $64, r0
- movl $0x40, r0
- movl $0100, r0
+ movl $64, %r0
+ movl $0x40, %r0
+ movl $0100, %r0
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