1 #ifndef _RISCV_DECODE_H
2 #define _RISCV_DECODE_H
4 #define __STDC_LIMIT_MACROS
6 typedef int int128_t
__attribute__((mode(TI
)));
7 typedef unsigned int uint128_t
__attribute__((mode(TI
)));
9 #define support_64bit 1
10 typedef int64_t sreg_t
;
11 typedef uint64_t reg_t
;
20 const int OPCODE_BITS
= 7;
21 const int JTYPE_OPCODE_BITS
= 5;
23 const int GPR_BITS
= 8*sizeof(reg_t
);
24 const int GPRID_BITS
= 5;
25 const int NGPR
= 1 << GPRID_BITS
;
27 const int FPR_BITS
= 64;
28 const int FPRID_BITS
= 5;
29 const int NFPR
= 1 << FPRID_BITS
;
31 const int IMM_BITS
= 12;
32 const int TARGET_BITS
= 27;
33 const int SHAMT_BITS
= 6;
34 const int FUNCT_BITS
= 3;
35 const int FFUNCT_BITS
= 5;
36 const int BIGIMM_BITS
= 20;
38 #define SR_ET 0x0000000000000001ULL
39 #define SR_PS 0x0000000000000004ULL
40 #define SR_S 0x0000000000000008ULL
41 #define SR_EF 0x0000000000000010ULL
42 #define SR_UX 0x0000000000000020ULL
43 #define SR_KX 0x0000000000000040ULL
44 #define SR_IM 0x000000000000FF00ULL
45 #define SR_ZERO 0xFFFFFFFFFFFF0082ULL
47 // note: bit fields are in little-endian order
50 unsigned imm
: IMM_BITS
;
51 unsigned funct
: FUNCT_BITS
;
52 unsigned rb
: GPRID_BITS
;
53 unsigned ra
: GPRID_BITS
;
54 unsigned opcode
: OPCODE_BITS
;
59 unsigned target
: TARGET_BITS
;
60 unsigned jump_opcode
: JTYPE_OPCODE_BITS
;
65 unsigned rc
: GPRID_BITS
;
66 unsigned shamt
: SHAMT_BITS
;
68 unsigned funct
: FUNCT_BITS
;
69 unsigned rb
: GPRID_BITS
;
70 unsigned ra
: GPRID_BITS
;
71 unsigned opcode
: OPCODE_BITS
;
76 unsigned bigimm
: BIGIMM_BITS
;
77 unsigned rt
: GPRID_BITS
;
78 unsigned opcode
: OPCODE_BITS
;
83 unsigned rc
: FPRID_BITS
;
84 unsigned rd
: FPRID_BITS
;
85 unsigned ffunct
: FFUNCT_BITS
;
86 unsigned rb
: FPRID_BITS
;
87 unsigned ra
: FPRID_BITS
;
88 unsigned opcode
: OPCODE_BITS
;
101 // helpful macros, etc
102 #define RA R[insn.rtype.ra]
103 #define RB R[insn.rtype.rb]
104 #define RC R[insn.rtype.rc]
105 #define FRA FR[insn.ftype.ra]
106 #define FRB FR[insn.ftype.rb]
107 #define FRC FR[insn.ftype.rc]
108 #define FRD FR[insn.ftype.rd]
109 #define BIGIMM insn.btype.bigimm
110 #define IMM insn.itype.imm
111 #define SIMM ((int32_t)((uint32_t)insn.itype.imm<<(32-IMM_BITS))>>(32-IMM_BITS))
112 #define SHAMT insn.rtype.shamt
113 #define TARGET insn.jtype.target
114 #define BRANCH_TARGET (npc + (SIMM*sizeof(insn_t)))
115 #define JUMP_TARGET ((npc & ~((1<<TARGET_BITS)*sizeof(insn_t)-1)) + TARGET*sizeof(insn_t))
117 #define require_supervisor if(!(sr & SR_S)) throw trap_privileged_instruction
118 #define require64 if(gprlen != 64) throw trap_illegal_instruction
119 #define require_fp if(!(sr & SR_EF)) throw trap_fp_disabled
120 #define cmp_trunc(reg) (reg_t(reg) << (64-gprlen))
122 static inline sreg_t
sext32(int32_t arg
)