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
;
12 typedef uint64_t freg_t
;
14 const int OPCODE_BITS
= 7;
15 const int JTYPE_OPCODE_BITS
= 5;
17 const int GPR_BITS
= 8*sizeof(reg_t
);
18 const int GPRID_BITS
= 5;
19 const int NGPR
= 1 << GPRID_BITS
;
21 const int FPR_BITS
= 64;
22 const int FPRID_BITS
= 5;
23 const int NFPR
= 1 << FPRID_BITS
;
25 const int IMM_BITS
= 12;
26 const int TARGET_BITS
= 27;
27 const int SHAMT_BITS
= 6;
28 const int FUNCT_BITS
= 3;
29 const int FFUNCT_BITS
= 5;
30 const int BIGIMM_BITS
= 20;
31 const int BRANCH_ALIGN_BITS
= 1;
32 const int JUMP_ALIGN_BITS
= 1;
34 #define SR_ET 0x0000000000000001ULL
35 #define SR_PS 0x0000000000000004ULL
36 #define SR_S 0x0000000000000008ULL
37 #define SR_EF 0x0000000000000010ULL
38 #define SR_UX 0x0000000000000020ULL
39 #define SR_KX 0x0000000000000040ULL
40 #define SR_IM 0x000000000000FF00ULL
41 #define SR_ZERO ~(SR_ET | SR_PS | SR_S | SR_EF | SR_UX | SR_KX | SR_IM)
48 #define FSR_RD_SHIFT 10
49 #define FSR_RD (0x7 << FSR_RD_SHIFT)
57 #define FSR_AEXC_SHIFT 0
58 #define FSR_NVA (FPEXC_NV << FSR_AEXC_SHIFT)
59 #define FSR_OFA (FPEXC_OF << FSR_AEXC_SHIFT)
60 #define FSR_UFA (FPEXC_UF << FSR_AEXC_SHIFT)
61 #define FSR_DZA (FPEXC_DZ << FSR_AEXC_SHIFT)
62 #define FSR_NXA (FPEXC_NX << FSR_AEXC_SHIFT)
63 #define FSR_AEXC (FSR_NVA | FSR_OFA | FSR_UFA | FSR_DZA | FSR_NXA)
65 #define FSR_ZERO ~(FSR_RD | FSR_AEXC)
67 // note: bit fields are in little-endian order
70 unsigned imm
: IMM_BITS
;
71 unsigned funct
: FUNCT_BITS
;
72 unsigned rb
: GPRID_BITS
;
73 unsigned ra
: GPRID_BITS
;
74 unsigned opcode
: OPCODE_BITS
;
79 unsigned target
: TARGET_BITS
;
80 unsigned jump_opcode
: JTYPE_OPCODE_BITS
;
85 unsigned rc
: GPRID_BITS
;
86 unsigned shamt
: SHAMT_BITS
;
88 unsigned funct
: FUNCT_BITS
;
89 unsigned rb
: GPRID_BITS
;
90 unsigned ra
: GPRID_BITS
;
91 unsigned opcode
: OPCODE_BITS
;
96 unsigned bigimm
: BIGIMM_BITS
;
97 unsigned rt
: GPRID_BITS
;
98 unsigned opcode
: OPCODE_BITS
;
103 unsigned rc
: FPRID_BITS
;
104 unsigned rd
: FPRID_BITS
;
105 unsigned ffunct
: FFUNCT_BITS
;
106 unsigned rb
: FPRID_BITS
;
107 unsigned ra
: FPRID_BITS
;
108 unsigned opcode
: OPCODE_BITS
;
121 // helpful macros, etc
122 #define RA R[insn.rtype.ra]
123 #define RB R[insn.rtype.rb]
124 #define RC R[insn.rtype.rc]
125 #define FRA FR[insn.ftype.ra]
126 #define FRB FR[insn.ftype.rb]
127 #define FRC FR[insn.ftype.rc]
128 #define FRD FR[insn.ftype.rd]
129 #define BIGIMM insn.btype.bigimm
130 #define IMM insn.itype.imm
131 #define SIMM ((int32_t)((uint32_t)insn.itype.imm<<(32-IMM_BITS))>>(32-IMM_BITS))
132 #define SHAMT insn.rtype.shamt
133 #define TARGET insn.jtype.target
134 #define BRANCH_TARGET (pc + (SIMM << BRANCH_ALIGN_BITS))
135 #define JUMP_TARGET ((pc & ~((1<<(TARGET_BITS+JUMP_ALIGN_BITS))-1)) + (TARGET << JUMP_ALIGN_BITS))
137 #define require_supervisor if(!(sr & SR_S)) throw trap_privileged_instruction
138 #define require64 if(gprlen != 64) throw trap_illegal_instruction
139 #define require_fp if(!(sr & SR_EF)) throw trap_fp_disabled
140 #define cmp_trunc(reg) (reg_t(reg) << (64-gprlen))
141 #define set_fp_exceptions ({ set_fsr(fsr | \
142 (softfloat_exceptionFlags << FSR_AEXC_SHIFT)); \
143 softfloat_exceptionFlags = 0; })
145 static inline sreg_t
sext32(int32_t arg
)