regdef.h revision 202175 
1/*-
2 * Copyright (c) 2001, Juniper Networks, Inc.
3 * All rights reserved.
4 * Truman Joe, February 2001.
5 *
6 * regdef.h -- MIPS register definitions.
7 *
8 *	JNPR: regdef.h,v 1.3 2006/08/07 05:38:57 katta
9 * $FreeBSD: head/sys/mips/include/regdef.h 202175 2010-01-12 21:36:08Z imp $
10 */
11
12#ifndef _MACHINE_REGDEF_H_
13#define	_MACHINE_REGDEF_H_
14
15#include <machine/cdefs.h>		/* For API selection */
16
17#if defined(__ASSEMBLER__)
18/* General purpose CPU register names */
19#define	zero	$0	/* wired zero */
20#define	AT	$at	/* assembler temp */
21#define	v0	$2	/* return value */
22#define	v1	$3
23#define	a0	$4	/* argument registers */
24#define	a1	$5
25#define	a2	$6
26#define	a3	$7
27#if defined(__mips_n32) || defined(__mips_n64)
28#define	a4	$8
29#define	a5	$9
30#define	a6	$10
31#define	a7	$11
32#define	t0	$12	/* Temp regs, not saved accross subroutine calls */
33#define	t1	$13
34#define	t2	$14
35#define	t3	$15
36#else
37#define	t0	$8	/* caller saved */
38#define	t1	$9
39#define	t2	$10
40#define	t3	$11
41#define	t4	$12	/* caller saved - 32 bit env arg reg 64 bit */
42#define	t5	$13
43#define	t6	$14
44#define	t7	$15
45#endif
46#define	s0	$16	/* callee saved */
47#define	s1	$17
48#define	s2	$18
49#define	s3	$19
50#define	s4	$20
51#define	s5	$21
52#define	s6	$22
53#define	s7	$23
54#define	t8	$24	/* code generator */
55#define	t9	$25
56#define	k0	$26	/* kernel temporary */
57#define	k1	$27
58#define	gp	$28	/* global pointer */
59#define	sp	$29	/* stack pointer */
60#define	fp	$30	/* frame pointer */
61#define	s8	$30	/* callee saved */
62#define	ra	$31	/* return address */
63
64/*
65 * These are temp registers whose names can be used in either the old
66 * or new ABI, although they map to different physical registers.  In
67 * the old ABI, they map to t4-t7, and in the new ABI, they map to a4-a7.
68 *
69 * Because they overlap with the last 4 arg regs in the new ABI, ta0-ta3
70 * should be used only when we need more than t0-t3.
71 */
72#if defined(__mips_n32) || defined(__mips_n64)
73#define	ta0	$8
74#define	ta1	$9
75#define	ta2	$10
76#define	ta3	$11
77#else
78#define	ta0	$12
79#define	ta1	$13
80#define	ta2	$14
81#define	ta3	$15
82#endif /* __mips_n32 || __mips_n64 */
83
84#endif /* __ASSEMBLER__ */
85
86#endif /* !_MACHINE_REGDEF_H_ */
87