registers.h

Go to the documentation of this file.

#ifndef __REGISTERS_H__
#define __REGISTERS_H__

#define ZERO $0 // Constant zero

#define AT $1       // Assembler temp

#define V0 $2   // Function return 0
#define V1 $3   // Function return 1

#define A0 $4       // Function argument 0
#define A1 $5       // Function argument 1
#define A2 $6       // Function argument 2
#define A3 $7       // Function argument 3

#define T0 $8       // Temporary register 0
#define T1 $9       // Temporary register 1
#define T2 $10  // Temporary register 2
#define T3 $11  // Temporary register 3
#define T4 $12  // Temporary register 4
#define T5 $13  // Temporary register 5
#define T6 $14  // Temporary register 6
#define T7 $15  // Temporary register 7

#define S0 $16  // Saved register 0
#define S1 $17  // Saved register 1
#define S2 $18  // Saved register 2
#define S3 $19  // Saved register 3
#define S4 $20  // Saved register 4
#define S5 $21  // Saved register 5
#define S6 $22  // Saved register 6
#define S7 $23  // Saved register 7

#define T8 $24  // Temporary register 8
#define T9 $25  // Temporary register 9

#define K0 $26  // Kernel register 0
#define K1 $27  // Kernel register 1

#define GP $gp  // Global pointer
#define SP $sp  // Stack pointer
#define FP $fp  // Frame pointer

#define RA $ra  // Return address

// -----------------------------------
// Coprocessor 0 registers
// -----------------------------------

#define C0_INDEX        $0  // Select TLB entry for read / write
#define C0_RANDOM   $1
#define C0_ENTRYLO0 $2
#define C0_ENTRYLO1 $3
#define C0_CONTEXT  $4
#define C0_PAGEMASK $5
#define C0_WIRED        $6
#define C0_BADVADDR $8  // Bad virtual address
#define C0_ENTRYHI  $10

#define C0_COUNT        $9  // Timer count
#define C0_COMPARE  $11 // Timer compare

#define C0_STATUS       $12 // Status register
#define C0_CAUSE        $13 // Cause register

#define C0_EPC          $14 // Exception Program Counter

#define C0_EBASE        $15,1   // Exception entry point base address

#define C0_CONFIG       $16     // CPU Config
#define C0_CONFIG1  $16,1   // Config 1 (contains TLB size)
#define C0_CONFIG2  $16,2
#define C0_CONFIG3  $16,3

#endif