1 #ifndef _RISCV_DECODE_H
2 #define _RISCV_DECODE_H
4 #define __STDC_LIMIT_MACROS
9 typedef int int128_t
__attribute__((mode(TI
)));
10 typedef unsigned int uint128_t
__attribute__((mode(TI
)));
12 typedef int64_t sreg_t
;
13 typedef uint64_t reg_t
;
14 typedef uint64_t freg_t
;
16 const int OPCODE_BITS
= 7;
18 const int XPRID_BITS
= 5;
19 const int NXPR
= 1 << XPRID_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 IMMLO_BITS
= 7;
27 const int TARGET_BITS
= 25;
28 const int FUNCT_BITS
= 3;
29 const int FUNCTR_BITS
= 7;
30 const int FFUNCT_BITS
= 2;
31 const int RM_BITS
= 3;
32 const int BIGIMM_BITS
= 20;
33 const int BRANCH_ALIGN_BITS
= 1;
34 const int JUMP_ALIGN_BITS
= 1;
36 #define SR_ET 0x0000000000000001ULL
37 #define SR_EF 0x0000000000000002ULL
38 #define SR_EV 0x0000000000000004ULL
39 #define SR_EC 0x0000000000000008ULL
40 #define SR_PS 0x0000000000000010ULL
41 #define SR_S 0x0000000000000020ULL
42 #define SR_UX 0x0000000000000040ULL
43 #define SR_SX 0x0000000000000080ULL
44 #define SR_IM 0x000000000000FF00ULL
45 #define SR_VM 0x0000000000010000ULL
46 #define SR_ZERO ~(SR_ET|SR_EF|SR_EV|SR_EC|SR_PS|SR_S|SR_UX|SR_SX|SR_IM|SR_VM)
50 #define CAUSE_EXCCODE 0x000000FF
51 #define CAUSE_IP 0x0000FF00
52 #define CAUSE_EXCCODE_SHIFT 0
53 #define CAUSE_IP_SHIFT 8
61 #define FSR_RD_SHIFT 5
62 #define FSR_RD (0x7 << FSR_RD_SHIFT)
70 #define FSR_AEXC_SHIFT 0
71 #define FSR_NVA (FPEXC_NV << FSR_AEXC_SHIFT)
72 #define FSR_OFA (FPEXC_OF << FSR_AEXC_SHIFT)
73 #define FSR_UFA (FPEXC_UF << FSR_AEXC_SHIFT)
74 #define FSR_DZA (FPEXC_DZ << FSR_AEXC_SHIFT)
75 #define FSR_NXA (FPEXC_NX << FSR_AEXC_SHIFT)
76 #define FSR_AEXC (FSR_NVA | FSR_OFA | FSR_UFA | FSR_DZA | FSR_NXA)
78 #define FSR_ZERO ~(FSR_RD | FSR_AEXC)
80 // note: bit fields are in little-endian order
83 unsigned opcode
: OPCODE_BITS
;
84 unsigned funct
: FUNCT_BITS
;
85 signed imm12
: IMM_BITS
;
86 unsigned rs1
: XPRID_BITS
;
87 unsigned rd
: XPRID_BITS
;
92 unsigned opcode
: OPCODE_BITS
;
93 unsigned funct
: FUNCT_BITS
;
94 unsigned immlo
: IMMLO_BITS
;
95 unsigned rs2
: XPRID_BITS
;
96 unsigned rs1
: XPRID_BITS
;
97 signed immhi
: IMM_BITS
-IMMLO_BITS
;
102 unsigned jump_opcode
: OPCODE_BITS
;
103 signed target
: TARGET_BITS
;
108 unsigned opcode
: OPCODE_BITS
;
109 unsigned funct
: FUNCT_BITS
;
110 unsigned functr
: FUNCTR_BITS
;
111 unsigned rs2
: XPRID_BITS
;
112 unsigned rs1
: XPRID_BITS
;
113 unsigned rd
: XPRID_BITS
;
118 unsigned opcode
: OPCODE_BITS
;
119 unsigned bigimm
: BIGIMM_BITS
;
120 unsigned rd
: XPRID_BITS
;
125 unsigned opcode
: OPCODE_BITS
;
126 unsigned ffunct
: FFUNCT_BITS
;
127 unsigned rm
: RM_BITS
;
128 unsigned rs3
: FPRID_BITS
;
129 unsigned rs2
: FPRID_BITS
;
130 unsigned rs1
: FPRID_BITS
;
131 unsigned rd
: FPRID_BITS
;
147 class trace_writeback
150 trace_writeback(reg_t
* _rf
, int _rd
) : rf(_rf
), rd(_rd
) {}
152 reg_t
operator = (reg_t rhs
)
154 printf("R[%x] <= %llx\n",rd
,(long long)rhs
);
164 #define do_writeback(rf,rd) trace_writeback(rf,rd)
166 #define do_writeback(rf,rd) rf[rd]
169 // helpful macros, etc
170 #define RS1 XPR[insn.rtype.rs1]
171 #define RS2 XPR[insn.rtype.rs2]
172 #define RD do_writeback(XPR,insn.rtype.rd)
173 #define RA do_writeback(XPR,1)
174 #define FRS1 FPR[insn.ftype.rs1]
175 #define FRS2 FPR[insn.ftype.rs2]
176 #define FRS3 FPR[insn.ftype.rs3]
177 #define FRD FPR[insn.ftype.rd]
178 #define BIGIMM insn.ltype.bigimm
179 #define SIMM insn.itype.imm12
180 #define BIMM ((signed)insn.btype.immlo | (insn.btype.immhi << IMMLO_BITS))
181 #define SHAMT (insn.itype.imm12 & 0x3F)
182 #define SHAMTW (insn.itype.imm12 & 0x1F)
183 #define TARGET insn.jtype.target
184 #define BRANCH_TARGET (pc + (BIMM << BRANCH_ALIGN_BITS))
185 #define JUMP_TARGET (pc + (TARGET << JUMP_ALIGN_BITS))
186 #define RM ({ int rm = insn.ftype.rm; \
187 if(rm == 7) rm = (fsr & FSR_RD) >> FSR_RD_SHIFT; \
188 if(rm > 4) throw trap_illegal_instruction; \
191 #define require_supervisor if(!(sr & SR_S)) throw trap_privileged_instruction
192 #define xpr64 (xprlen == 64)
193 #define require_xpr64 if(!xpr64) throw trap_illegal_instruction
194 #define require_xpr32 if(xpr64) throw trap_illegal_instruction
195 #define require_fp if(!(sr & SR_EF)) throw trap_fp_disabled
196 #define require_vector if(!(sr & SR_EV)) throw trap_vector_disabled
197 #define cmp_trunc(reg) (reg_t(reg) << (64-xprlen))
198 #define set_fp_exceptions ({ set_fsr(fsr | \
199 (softfloat_exceptionFlags << FSR_AEXC_SHIFT)); \
200 softfloat_exceptionFlags = 0; })
202 #define require_rvc if(!(sr & SR_EC)) throw trap_illegal_instruction
203 #define insn_length(x) (((x).bits & 0x3) < 0x3 ? 2 : 4)
205 #define sext32(x) ((sreg_t)(int32_t)(x))
206 #define zext32(x) ((reg_t)(uint32_t)(x))
207 #define sext_xprlen(x) ((sreg_t(x) << (64-xprlen)) >> (64-xprlen))
208 #define zext_xprlen(x) ((reg_t(x) << (64-xprlen)) >> (64-xprlen))
212 #define INSN_IS_RVC(x) (((x) & 0x3) < 0x3)
214 #define CRD_REGNUM ((insn.bits >> 5) & 0x1f)
215 #define CRD do_writeback(XPR, CRD_REGNUM)
216 #define CRS1 XPR[(insn.bits >> 10) & 0x1f]
217 #define CRS2 XPR[(insn.bits >> 5) & 0x1f]
218 #define CIMM6 ((int32_t)((insn.bits >> 10) & 0x3f) << 26 >> 26)
219 #define CIMM5U ((insn.bits >> 5) & 0x1f)
220 #define CIMM5 ((int32_t)CIMM5U << 27 >> 27)
221 #define CIMM10 ((int32_t)((insn.bits >> 5) & 0x3ff) << 22 >> 22)
222 #define CBRANCH_TARGET (pc + (CIMM5 << BRANCH_ALIGN_BITS))
223 #define CJUMP_TARGET (pc + (CIMM10 << JUMP_ALIGN_BITS))
225 static const int rvc_rs1_regmap
[8] = { 20, 21, 2, 3, 4, 5, 6, 7 };
226 #define rvc_rd_regmap rvc_rs1_regmap
227 #define rvc_rs2b_regmap rvc_rs1_regmap
228 static const int rvc_rs2_regmap
[8] = { 20, 21, 2, 3, 4, 5, 6, 0 };
229 #define CRDS XPR[rvc_rd_regmap[(insn.bits >> 13) & 0x7]]
230 #define FCRDS FPR[rvc_rd_regmap[(insn.bits >> 13) & 0x7]]
231 #define CRS1S XPR[rvc_rs1_regmap[(insn.bits >> 10) & 0x7]]
232 #define CRS2S XPR[rvc_rs2_regmap[(insn.bits >> 13) & 0x7]]
233 #define CRS2BS XPR[rvc_rs2b_regmap[(insn.bits >> 5) & 0x7]]
234 #define FCRS2S FPR[rvc_rs2_regmap[(insn.bits >> 13) & 0x7]]
239 #define UT_RS1(idx) uts[idx]->XPR[insn.rtype.rs1]
240 #define UT_RS2(idx) uts[idx]->XPR[insn.rtype.rs2]
241 #define UT_RD(idx) do_writeback(uts[idx]->XPR,insn.rtype.rd)
242 #define UT_RA(idx) do_writeback(uts[idx]->XPR,1)
243 #define UT_FRS1(idx) uts[idx]->FPR[insn.ftype.rs1]
244 #define UT_FRS2(idx) uts[idx]->FPR[insn.ftype.rs2]
245 #define UT_FRS3(idx) uts[idx]->FPR[insn.ftype.rs3]
246 #define UT_FRD(idx) uts[idx]->FPR[insn.ftype.rd]
247 #define UT_RM(idx) ((insn.ftype.rm != 7) ? insn.ftype.rm : \
248 ((uts[idx]->fsr & FSR_RD) >> FSR_RD_SHIFT))
250 #define UT_LOOP_START for (int i=0;i<VL; i++) {
251 #define UT_LOOP_END }
252 #define UT_LOOP_RS1 UT_RS1(i)
253 #define UT_LOOP_RS2 UT_RS2(i)
254 #define UT_LOOP_RD UT_RD(i)
255 #define UT_LOOP_RA UT_RA(i)
256 #define UT_LOOP_FRS1 UT_FRS1(i)
257 #define UT_LOOP_FRS2 UT_FRS2(i)
258 #define UT_LOOP_FRS3 UT_FRS3(i)
259 #define UT_LOOP_FRD UT_FRD(i)
260 #define UT_LOOP_RM UT_RM(i)
262 #define VEC_LOAD(dst, func, inc) \
265 UT_LOOP_##dst = mmu.func(addr); \
269 #define VEC_STORE(src, func, inc) \
272 mmu.func(addr, UT_LOOP_##src); \