diff options
Diffstat (limited to 'instruction.h')
| -rw-r--r-- | instruction.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/instruction.h b/instruction.h index 323a66b..4ee68ed 100644 --- a/instruction.h +++ b/instruction.h @@ -22,6 +22,14 @@ enum INST_TYPE { #define MASK_INST_WITYPE (0x8000) #define MASK_INST_JTYPE (0xC000) +#define INST_TYPE_RTYPE 0 +#define INST_TYPE_NITYPE 1 +#define INST_TYPE_WITYPE 2 +#define INST_TYPE_JTYPE 3 +#define INST_TYPE_SHAMT (14) +#define MASK_INST_TYPE(x) ((x) << INST_TYPE_SHAMT) +#define GET_INST_TYPE(x) (0x3 & ((x) >> INST_TYPE_SHAMT)) + #define RTYPE_SIZE_BYTES 2 /* instruction fits in 16 bits */ #define NITYPE_SIZE_BYTES 2 /* instruction fits in 16 bits */ #define BTYPE_SIZE_BYTES 2 /* instruction fits in 16 bits */ @@ -46,6 +54,7 @@ enum OPER { }; #define OPER_SHAMT (11) #define MASK_OPER(x) ((x) << OPER_SHAMT) +#define GET_OPER(x) (0x7 & ((x) >> OPER_SHAMT)) /** * Masks for jump and branch conditions @@ -64,11 +73,14 @@ enum JCOND { }; #define JB_SHAMT (10) #define MASK_JB_COND(x) ((x) << JB_SHAMT) +#define GET_JB_COND(x) (0x7 & ((x) >> JB_SHAMT)) + #define MASK_IS_JUMP (0 << 13) #define MASK_IS_BRANCH (1 << 13) #define MASK_JI (0x0 << 8) #define MASK_JR (0x1 << 8) #define MASK_JUMP_REGISTER(x) ((x) << 5) +#define GET_JUMP_REG(x) (0x07 & ((x) >> 5)) /** @@ -92,19 +104,24 @@ enum REG { /* destination reg: xxxxx___ xxxxxxxx */ #define REG_DEST_OFFSET (8) #define MASK_REG_DEST(x) ((x) << REG_DEST_OFFSET) +#define GET_REG_DEST(x) (0x7 & ((x) >> REG_DEST_OFFSET)) /* left reg: xxxxxxxx ___xxxxx */ #define REG_LEFT_OFFSET (5) #define MASK_REG_LEFT(x) ((x) << REG_LEFT_OFFSET) +#define GET_REG_LEFT(x) (0x7 & ((x) >> REG_LEFT_OFFSET)) /* right reg (R-type only): xxxxxxxx xxx___xx */ #define REG_RIGHT_OFFSET (2) #define MASK_REG_RIGHT(x) ((x) << REG_RIGHT_OFFSET) +#define GET_REG_RIGHT(x) (0x7 & ((x) >> REG_RIGHT_OFFSET)) /* five LSb are narrow immediate value */ #define MASK_NI_IMM(x) ((x) & 0x1F) +#define GET_NI_IMM(x) (0x1F & (x)) /* 10 LSb is branch offset */ #define MASK_B_OFFSET(x) ((x) & 0x3FF) +#define GET_B_OFFSET(x) ((x) & 0x3FF) #endif /* INSTRUCTION_H */ |