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From: Juli Mallett <jmallett@FreeBSD.org>
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Subject: PERFORCE change 29968 for review
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http://perforce.freebsd.org/chv.cgi?CH=29968

Change 29968 by jmallett@jmallett_dalek on 2003/04/28 13:40:25

	MFNetBSD, new ABI register definitions.  Hmm, I wonder if
	the compiler is defaulting to the right one though :)

Affected files ...

.. //depot/projects/mips/sys/mips/include/regdef.h#2 edit

Differences ...

==== //depot/projects/mips/sys/mips/include/regdef.h#2 (text+ko) ====

@@ -1,4 +1,4 @@
-/*	$NetBSD: regdef.h,v 1.7 1999/03/30 14:22:58 soda Exp $	*/
+/*	$NetBSD: regdef.h,v 1.10 2002/11/04 03:38:32 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1992, 1993
@@ -50,14 +50,14 @@
 #define a1	$5
 #define a2	$6
 #define a3	$7
-#define t0	$8	/* temp registers (not saved across subroutine calls) */
-#define t1	$9
-#define t2	$10
-#define t3	$11
-#define t4	$12
-#define t5	$13
-#define t6	$14
-#define t7	$15
+#define	a4	$8
+#define	a5	$9
+#define	a6	$10
+#define	a7	$11
+#define	t0	$12	/* temp registers (not saved across subroutine calls) */
+#define	t1	$13
+#define	t2	$14
+#define	t3	$15
 #define s0	$16	/* saved across subroutine calls (callee saved) */
 #define s1	$17
 #define s2	$18
@@ -75,4 +75,17 @@
 #define s8	$30	/* one more callee saved */
 #define ra	$31	/* return address */
 
+/*
+ * These are temp registers whose names can be used in either the old
+ * or new ABI, although they map to different physical registers.  In
+ * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
+ *
+ * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
+ * should be used only when we need more than t0-t3.
+ */
+#define	ta0	$8
+#define	ta1	$9
+#define	ta2	$10
+#define	ta3	$11
+
 #endif /* _MIPS_REGDEF_H */