usr/src/sys/pmax/include/regdef.h

/*
 * Copyright (c) 1992 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell. This file is derived from the MIPS RISC
 * Architecture book by Gerry Kane.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)regdef.h    7.1 (Berkeley) %G%
 */

#define zero    $0      /* always zero */
#define AT      $at     /* assembler temp */
#define v0      $2      /* return value */
#define v1      $3
#define a0      $4      /* argument registers */
#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 s0      $16     /* saved across subroutine calls (callee saved) */
#define s1      $17
#define s2      $18
#define s3      $19
#define s4      $20
#define s5      $21
#define s6      $22
#define s7      $23
#define t8      $24     /* two more temp registers */
#define t9      $25
#define k0      $26     /* kernel temporary */
#define k1      $27
#define gp      $28     /* global pointer */
#define sp      $29     /* stack pointer */
#define s8      $30     /* one more callee saved */
#define ra      $31     /* return address */