2 * Copyright (C) 1985 MIPS Computer Systems, Inc.
3 * Copyright (C) 1994, 95, 99, 2003 by Ralf Baechle
4 * Copyright (C) 1990 - 1992, 1999 Silicon Graphics, Inc.
5 * Copyright (C) 2011 Wind River Systems,
6 * written by Ralf Baechle <ralf@linux-mips.org>
8 * SPDX-License-Identifier: GPL-2.0
13 #include <asm/sgidefs.h>
15 #if _MIPS_SIM == _MIPS_SIM_ABI32
18 * Symbolic register names for 32 bit ABI
20 #define zero $0 /* wired zero */
21 #define AT $1 /* assembler temp - uppercase because of ".set at" */
22 #define v0 $2 /* return value */
24 #define a0 $4 /* argument registers */
28 #define t0 $8 /* caller saved */
40 #define s0 $16 /* callee saved */
48 #define t8 $24 /* caller saved */
50 #define jp $25 /* PIC jump register */
51 #define k0 $26 /* kernel scratch */
53 #define gp $28 /* global pointer */
54 #define sp $29 /* stack pointer */
55 #define fp $30 /* frame pointer */
56 #define s8 $30 /* same like fp! */
57 #define ra $31 /* return address */
59 #endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
61 #if _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32
63 #define zero $0 /* wired zero */
64 #define AT $at /* assembler temp - uppercase because of ".set at" */
65 #define v0 $2 /* return value - caller saved */
67 #define a0 $4 /* argument registers */
71 #define a4 $8 /* arg reg 64 bit; caller saved in 32 bit */
79 #define t0 $12 /* caller saved */
83 #define s0 $16 /* callee saved */
91 #define t8 $24 /* caller saved */
92 #define t9 $25 /* callee address for PIC/temp */
93 #define jp $25 /* PIC jump register */
94 #define k0 $26 /* kernel temporary */
96 #define gp $28 /* global pointer - caller saved for PIC */
97 #define sp $29 /* stack pointer */
98 #define fp $30 /* frame pointer */
99 #define s8 $30 /* callee saved */
100 #define ra $31 /* return address */
102 #endif /* _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32 */
104 #endif /* _ASM_REGDEF_H */