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RISC-V: Accept version, supervisor ext and more than one NSE for -march.
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1 /* riscv.h. RISC-V opcode list for GDB, the GNU debugger.
2 Copyright (C) 2011-2018 Free Software Foundation, Inc.
3 Contributed by Andrew Waterman
4
5 This file is part of GDB, GAS, and the GNU binutils.
6
7 GDB, GAS, and the GNU binutils are free software; you can redistribute
8 them and/or modify them under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either version
10 3, or (at your option) any later version.
11
12 GDB, GAS, and the GNU binutils are distributed in the hope that they
13 will be useful, but WITHOUT ANY WARRANTY; without even the implied
14 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 the GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; see the file COPYING3. If not,
19 see <http://www.gnu.org/licenses/>. */
20
21 #ifndef _RISCV_H_
22 #define _RISCV_H_
23
24 #include "riscv-opc.h"
25 #include <stdlib.h>
26 #include <stdint.h>
27
28 typedef uint64_t insn_t;
29
30 static inline unsigned int riscv_insn_length (insn_t insn)
31 {
32 if ((insn & 0x3) != 0x3) /* RVC. */
33 return 2;
34 if ((insn & 0x1f) != 0x1f) /* Base ISA and extensions in 32-bit space. */
35 return 4;
36 if ((insn & 0x3f) == 0x1f) /* 48-bit extensions. */
37 return 6;
38 if ((insn & 0x7f) == 0x3f) /* 64-bit extensions. */
39 return 8;
40 /* Longer instructions not supported at the moment. */
41 return 2;
42 }
43
44 static const char * const riscv_rm[8] =
45 {
46 "rne", "rtz", "rdn", "rup", "rmm", 0, 0, "dyn"
47 };
48
49 static const char * const riscv_pred_succ[16] =
50 {
51 0, "w", "r", "rw", "o", "ow", "or", "orw",
52 "i", "iw", "ir", "irw", "io", "iow", "ior", "iorw"
53 };
54
55 #define RVC_JUMP_BITS 11
56 #define RVC_JUMP_REACH ((1ULL << RVC_JUMP_BITS) * RISCV_JUMP_ALIGN)
57
58 #define RVC_BRANCH_BITS 8
59 #define RVC_BRANCH_REACH ((1ULL << RVC_BRANCH_BITS) * RISCV_BRANCH_ALIGN)
60
61 #define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
62 #define RV_IMM_SIGN(x) (-(((x) >> 31) & 1))
63
64 #define EXTRACT_ITYPE_IMM(x) \
65 (RV_X(x, 20, 12) | (RV_IMM_SIGN(x) << 12))
66 #define EXTRACT_STYPE_IMM(x) \
67 (RV_X(x, 7, 5) | (RV_X(x, 25, 7) << 5) | (RV_IMM_SIGN(x) << 12))
68 #define EXTRACT_SBTYPE_IMM(x) \
69 ((RV_X(x, 8, 4) << 1) | (RV_X(x, 25, 6) << 5) | (RV_X(x, 7, 1) << 11) | (RV_IMM_SIGN(x) << 12))
70 #define EXTRACT_UTYPE_IMM(x) \
71 ((RV_X(x, 12, 20) << 12) | (RV_IMM_SIGN(x) << 32))
72 #define EXTRACT_UJTYPE_IMM(x) \
73 ((RV_X(x, 21, 10) << 1) | (RV_X(x, 20, 1) << 11) | (RV_X(x, 12, 8) << 12) | (RV_IMM_SIGN(x) << 20))
74 #define EXTRACT_RVC_IMM(x) \
75 (RV_X(x, 2, 5) | (-RV_X(x, 12, 1) << 5))
76 #define EXTRACT_RVC_LUI_IMM(x) \
77 (EXTRACT_RVC_IMM (x) << RISCV_IMM_BITS)
78 #define EXTRACT_RVC_SIMM3(x) \
79 (RV_X(x, 10, 2) | (-RV_X(x, 12, 1) << 2))
80 #define EXTRACT_RVC_UIMM8(x) \
81 (RV_X(x, 5, 8))
82 #define EXTRACT_RVC_ADDI4SPN_IMM(x) \
83 ((RV_X(x, 6, 1) << 2) | (RV_X(x, 5, 1) << 3) | (RV_X(x, 11, 2) << 4) | (RV_X(x, 7, 4) << 6))
84 #define EXTRACT_RVC_ADDI16SP_IMM(x) \
85 ((RV_X(x, 6, 1) << 4) | (RV_X(x, 2, 1) << 5) | (RV_X(x, 5, 1) << 6) | (RV_X(x, 3, 2) << 7) | (-RV_X(x, 12, 1) << 9))
86 #define EXTRACT_RVC_LW_IMM(x) \
87 ((RV_X(x, 6, 1) << 2) | (RV_X(x, 10, 3) << 3) | (RV_X(x, 5, 1) << 6))
88 #define EXTRACT_RVC_LD_IMM(x) \
89 ((RV_X(x, 10, 3) << 3) | (RV_X(x, 5, 2) << 6))
90 #define EXTRACT_RVC_LWSP_IMM(x) \
91 ((RV_X(x, 4, 3) << 2) | (RV_X(x, 12, 1) << 5) | (RV_X(x, 2, 2) << 6))
92 #define EXTRACT_RVC_LDSP_IMM(x) \
93 ((RV_X(x, 5, 2) << 3) | (RV_X(x, 12, 1) << 5) | (RV_X(x, 2, 3) << 6))
94 #define EXTRACT_RVC_SWSP_IMM(x) \
95 ((RV_X(x, 9, 4) << 2) | (RV_X(x, 7, 2) << 6))
96 #define EXTRACT_RVC_SDSP_IMM(x) \
97 ((RV_X(x, 10, 3) << 3) | (RV_X(x, 7, 3) << 6))
98 #define EXTRACT_RVC_B_IMM(x) \
99 ((RV_X(x, 3, 2) << 1) | (RV_X(x, 10, 2) << 3) | (RV_X(x, 2, 1) << 5) | (RV_X(x, 5, 2) << 6) | (-RV_X(x, 12, 1) << 8))
100 #define EXTRACT_RVC_J_IMM(x) \
101 ((RV_X(x, 3, 3) << 1) | (RV_X(x, 11, 1) << 4) | (RV_X(x, 2, 1) << 5) | (RV_X(x, 7, 1) << 6) | (RV_X(x, 6, 1) << 7) | (RV_X(x, 9, 2) << 8) | (RV_X(x, 8, 1) << 10) | (-RV_X(x, 12, 1) << 11))
102
103 #define ENCODE_ITYPE_IMM(x) \
104 (RV_X(x, 0, 12) << 20)
105 #define ENCODE_STYPE_IMM(x) \
106 ((RV_X(x, 0, 5) << 7) | (RV_X(x, 5, 7) << 25))
107 #define ENCODE_SBTYPE_IMM(x) \
108 ((RV_X(x, 1, 4) << 8) | (RV_X(x, 5, 6) << 25) | (RV_X(x, 11, 1) << 7) | (RV_X(x, 12, 1) << 31))
109 #define ENCODE_UTYPE_IMM(x) \
110 (RV_X(x, 12, 20) << 12)
111 #define ENCODE_UJTYPE_IMM(x) \
112 ((RV_X(x, 1, 10) << 21) | (RV_X(x, 11, 1) << 20) | (RV_X(x, 12, 8) << 12) | (RV_X(x, 20, 1) << 31))
113 #define ENCODE_RVC_IMM(x) \
114 ((RV_X(x, 0, 5) << 2) | (RV_X(x, 5, 1) << 12))
115 #define ENCODE_RVC_LUI_IMM(x) \
116 ENCODE_RVC_IMM ((x) >> RISCV_IMM_BITS)
117 #define ENCODE_RVC_SIMM3(x) \
118 (RV_X(x, 0, 3) << 10)
119 #define ENCODE_RVC_UIMM8(x) \
120 (RV_X(x, 0, 8) << 5)
121 #define ENCODE_RVC_ADDI4SPN_IMM(x) \
122 ((RV_X(x, 2, 1) << 6) | (RV_X(x, 3, 1) << 5) | (RV_X(x, 4, 2) << 11) | (RV_X(x, 6, 4) << 7))
123 #define ENCODE_RVC_ADDI16SP_IMM(x) \
124 ((RV_X(x, 4, 1) << 6) | (RV_X(x, 5, 1) << 2) | (RV_X(x, 6, 1) << 5) | (RV_X(x, 7, 2) << 3) | (RV_X(x, 9, 1) << 12))
125 #define ENCODE_RVC_LW_IMM(x) \
126 ((RV_X(x, 2, 1) << 6) | (RV_X(x, 3, 3) << 10) | (RV_X(x, 6, 1) << 5))
127 #define ENCODE_RVC_LD_IMM(x) \
128 ((RV_X(x, 3, 3) << 10) | (RV_X(x, 6, 2) << 5))
129 #define ENCODE_RVC_LWSP_IMM(x) \
130 ((RV_X(x, 2, 3) << 4) | (RV_X(x, 5, 1) << 12) | (RV_X(x, 6, 2) << 2))
131 #define ENCODE_RVC_LDSP_IMM(x) \
132 ((RV_X(x, 3, 2) << 5) | (RV_X(x, 5, 1) << 12) | (RV_X(x, 6, 3) << 2))
133 #define ENCODE_RVC_SWSP_IMM(x) \
134 ((RV_X(x, 2, 4) << 9) | (RV_X(x, 6, 2) << 7))
135 #define ENCODE_RVC_SDSP_IMM(x) \
136 ((RV_X(x, 3, 3) << 10) | (RV_X(x, 6, 3) << 7))
137 #define ENCODE_RVC_B_IMM(x) \
138 ((RV_X(x, 1, 2) << 3) | (RV_X(x, 3, 2) << 10) | (RV_X(x, 5, 1) << 2) | (RV_X(x, 6, 2) << 5) | (RV_X(x, 8, 1) << 12))
139 #define ENCODE_RVC_J_IMM(x) \
140 ((RV_X(x, 1, 3) << 3) | (RV_X(x, 4, 1) << 11) | (RV_X(x, 5, 1) << 2) | (RV_X(x, 6, 1) << 7) | (RV_X(x, 7, 1) << 6) | (RV_X(x, 8, 2) << 9) | (RV_X(x, 10, 1) << 8) | (RV_X(x, 11, 1) << 12))
141
142 #define VALID_ITYPE_IMM(x) (EXTRACT_ITYPE_IMM(ENCODE_ITYPE_IMM(x)) == (x))
143 #define VALID_STYPE_IMM(x) (EXTRACT_STYPE_IMM(ENCODE_STYPE_IMM(x)) == (x))
144 #define VALID_SBTYPE_IMM(x) (EXTRACT_SBTYPE_IMM(ENCODE_SBTYPE_IMM(x)) == (x))
145 #define VALID_UTYPE_IMM(x) (EXTRACT_UTYPE_IMM(ENCODE_UTYPE_IMM(x)) == (x))
146 #define VALID_UJTYPE_IMM(x) (EXTRACT_UJTYPE_IMM(ENCODE_UJTYPE_IMM(x)) == (x))
147 #define VALID_RVC_IMM(x) (EXTRACT_RVC_IMM(ENCODE_RVC_IMM(x)) == (x))
148 #define VALID_RVC_LUI_IMM(x) (ENCODE_RVC_LUI_IMM(x) != 0 && EXTRACT_RVC_LUI_IMM(ENCODE_RVC_LUI_IMM(x)) == (x))
149 #define VALID_RVC_SIMM3(x) (EXTRACT_RVC_SIMM3(ENCODE_RVC_SIMM3(x)) == (x))
150 #define VALID_RVC_UIMM8(x) (EXTRACT_RVC_UIMM8(ENCODE_RVC_UIMM8(x)) == (x))
151 #define VALID_RVC_ADDI4SPN_IMM(x) (EXTRACT_RVC_ADDI4SPN_IMM(ENCODE_RVC_ADDI4SPN_IMM(x)) == (x))
152 #define VALID_RVC_ADDI16SP_IMM(x) (EXTRACT_RVC_ADDI16SP_IMM(ENCODE_RVC_ADDI16SP_IMM(x)) == (x))
153 #define VALID_RVC_LW_IMM(x) (EXTRACT_RVC_LW_IMM(ENCODE_RVC_LW_IMM(x)) == (x))
154 #define VALID_RVC_LD_IMM(x) (EXTRACT_RVC_LD_IMM(ENCODE_RVC_LD_IMM(x)) == (x))
155 #define VALID_RVC_LWSP_IMM(x) (EXTRACT_RVC_LWSP_IMM(ENCODE_RVC_LWSP_IMM(x)) == (x))
156 #define VALID_RVC_LDSP_IMM(x) (EXTRACT_RVC_LDSP_IMM(ENCODE_RVC_LDSP_IMM(x)) == (x))
157 #define VALID_RVC_SWSP_IMM(x) (EXTRACT_RVC_SWSP_IMM(ENCODE_RVC_SWSP_IMM(x)) == (x))
158 #define VALID_RVC_SDSP_IMM(x) (EXTRACT_RVC_SDSP_IMM(ENCODE_RVC_SDSP_IMM(x)) == (x))
159 #define VALID_RVC_B_IMM(x) (EXTRACT_RVC_B_IMM(ENCODE_RVC_B_IMM(x)) == (x))
160 #define VALID_RVC_J_IMM(x) (EXTRACT_RVC_J_IMM(ENCODE_RVC_J_IMM(x)) == (x))
161
162 #define RISCV_RTYPE(insn, rd, rs1, rs2) \
163 ((MATCH_ ## insn) | ((rd) << OP_SH_RD) | ((rs1) << OP_SH_RS1) | ((rs2) << OP_SH_RS2))
164 #define RISCV_ITYPE(insn, rd, rs1, imm) \
165 ((MATCH_ ## insn) | ((rd) << OP_SH_RD) | ((rs1) << OP_SH_RS1) | ENCODE_ITYPE_IMM(imm))
166 #define RISCV_STYPE(insn, rs1, rs2, imm) \
167 ((MATCH_ ## insn) | ((rs1) << OP_SH_RS1) | ((rs2) << OP_SH_RS2) | ENCODE_STYPE_IMM(imm))
168 #define RISCV_SBTYPE(insn, rs1, rs2, target) \
169 ((MATCH_ ## insn) | ((rs1) << OP_SH_RS1) | ((rs2) << OP_SH_RS2) | ENCODE_SBTYPE_IMM(target))
170 #define RISCV_UTYPE(insn, rd, bigimm) \
171 ((MATCH_ ## insn) | ((rd) << OP_SH_RD) | ENCODE_UTYPE_IMM(bigimm))
172 #define RISCV_UJTYPE(insn, rd, target) \
173 ((MATCH_ ## insn) | ((rd) << OP_SH_RD) | ENCODE_UJTYPE_IMM(target))
174
175 #define RISCV_NOP RISCV_ITYPE(ADDI, 0, 0, 0)
176 #define RVC_NOP MATCH_C_ADDI
177
178 #define RISCV_CONST_HIGH_PART(VALUE) \
179 (((VALUE) + (RISCV_IMM_REACH/2)) & ~(RISCV_IMM_REACH-1))
180 #define RISCV_CONST_LOW_PART(VALUE) ((VALUE) - RISCV_CONST_HIGH_PART (VALUE))
181 #define RISCV_PCREL_HIGH_PART(VALUE, PC) RISCV_CONST_HIGH_PART((VALUE) - (PC))
182 #define RISCV_PCREL_LOW_PART(VALUE, PC) RISCV_CONST_LOW_PART((VALUE) - (PC))
183
184 #define RISCV_JUMP_BITS RISCV_BIGIMM_BITS
185 #define RISCV_JUMP_ALIGN_BITS 1
186 #define RISCV_JUMP_ALIGN (1 << RISCV_JUMP_ALIGN_BITS)
187 #define RISCV_JUMP_REACH ((1ULL << RISCV_JUMP_BITS) * RISCV_JUMP_ALIGN)
188
189 #define RISCV_IMM_BITS 12
190 #define RISCV_BIGIMM_BITS (32 - RISCV_IMM_BITS)
191 #define RISCV_IMM_REACH (1LL << RISCV_IMM_BITS)
192 #define RISCV_BIGIMM_REACH (1LL << RISCV_BIGIMM_BITS)
193 #define RISCV_RVC_IMM_REACH (1LL << 6)
194 #define RISCV_BRANCH_BITS RISCV_IMM_BITS
195 #define RISCV_BRANCH_ALIGN_BITS RISCV_JUMP_ALIGN_BITS
196 #define RISCV_BRANCH_ALIGN (1 << RISCV_BRANCH_ALIGN_BITS)
197 #define RISCV_BRANCH_REACH (RISCV_IMM_REACH * RISCV_BRANCH_ALIGN)
198
199 /* RV fields. */
200
201 #define OP_MASK_OP 0x7f
202 #define OP_SH_OP 0
203 #define OP_MASK_RS2 0x1f
204 #define OP_SH_RS2 20
205 #define OP_MASK_RS1 0x1f
206 #define OP_SH_RS1 15
207 #define OP_MASK_RS3 0x1f
208 #define OP_SH_RS3 27
209 #define OP_MASK_RD 0x1f
210 #define OP_SH_RD 7
211 #define OP_MASK_SHAMT 0x3f
212 #define OP_SH_SHAMT 20
213 #define OP_MASK_SHAMTW 0x1f
214 #define OP_SH_SHAMTW 20
215 #define OP_MASK_RM 0x7
216 #define OP_SH_RM 12
217 #define OP_MASK_PRED 0xf
218 #define OP_SH_PRED 24
219 #define OP_MASK_SUCC 0xf
220 #define OP_SH_SUCC 20
221 #define OP_MASK_AQ 0x1
222 #define OP_SH_AQ 26
223 #define OP_MASK_RL 0x1
224 #define OP_SH_RL 25
225
226 #define OP_MASK_CUSTOM_IMM 0x7f
227 #define OP_SH_CUSTOM_IMM 25
228 #define OP_MASK_CSR 0xfff
229 #define OP_SH_CSR 20
230
231 #define OP_MASK_FUNCT3 0x7
232 #define OP_SH_FUNCT3 12
233 #define OP_MASK_FUNCT7 0x7f
234 #define OP_SH_FUNCT7 25
235 #define OP_MASK_FUNCT2 0x3
236 #define OP_SH_FUNCT2 25
237
238 /* RVC fields. */
239
240 #define OP_MASK_OP2 0x3
241 #define OP_SH_OP2 0
242
243 #define OP_MASK_CRS2 0x1f
244 #define OP_SH_CRS2 2
245 #define OP_MASK_CRS1S 0x7
246 #define OP_SH_CRS1S 7
247 #define OP_MASK_CRS2S 0x7
248 #define OP_SH_CRS2S 2
249
250 #define OP_MASK_CFUNCT6 0x3f
251 #define OP_SH_CFUNCT6 10
252 #define OP_MASK_CFUNCT4 0xf
253 #define OP_SH_CFUNCT4 12
254 #define OP_MASK_CFUNCT3 0x7
255 #define OP_SH_CFUNCT3 13
256 #define OP_MASK_CFUNCT2 0x3
257 #define OP_SH_CFUNCT2 5
258
259 /* ABI names for selected x-registers. */
260
261 #define X_RA 1
262 #define X_SP 2
263 #define X_GP 3
264 #define X_TP 4
265 #define X_T0 5
266 #define X_T1 6
267 #define X_T2 7
268 #define X_T3 28
269
270 #define NGPR 32
271 #define NFPR 32
272
273 /* Replace bits MASK << SHIFT of STRUCT with the equivalent bits in
274 VALUE << SHIFT. VALUE is evaluated exactly once. */
275 #define INSERT_BITS(STRUCT, VALUE, MASK, SHIFT) \
276 (STRUCT) = (((STRUCT) & ~((insn_t)(MASK) << (SHIFT))) \
277 | ((insn_t)((VALUE) & (MASK)) << (SHIFT)))
278
279 /* Extract bits MASK << SHIFT from STRUCT and shift them right
280 SHIFT places. */
281 #define EXTRACT_BITS(STRUCT, MASK, SHIFT) \
282 (((STRUCT) >> (SHIFT)) & (MASK))
283
284 /* Extract the operand given by FIELD from integer INSN. */
285 #define EXTRACT_OPERAND(FIELD, INSN) \
286 EXTRACT_BITS ((INSN), OP_MASK_##FIELD, OP_SH_##FIELD)
287
288 /* The maximal number of subset can be required. */
289 #define MAX_SUBSET_NUM 4
290
291 /* This structure holds information for a particular instruction. */
292
293 struct riscv_opcode
294 {
295 /* The name of the instruction. */
296 const char *name;
297 /* The requirement of xlen for the instruction, 0 if no requirement. */
298 unsigned xlen_requirement;
299 /* An array of ISA subset name (I, M, A, F, D, Xextension), must ended
300 with a NULL pointer sential. */
301 const char *subset[MAX_SUBSET_NUM];
302 /* A string describing the arguments for this instruction. */
303 const char *args;
304 /* The basic opcode for the instruction. When assembling, this
305 opcode is modified by the arguments to produce the actual opcode
306 that is used. If pinfo is INSN_MACRO, then this is 0. */
307 insn_t match;
308 /* If pinfo is not INSN_MACRO, then this is a bit mask for the
309 relevant portions of the opcode when disassembling. If the
310 actual opcode anded with the match field equals the opcode field,
311 then we have found the correct instruction. If pinfo is
312 INSN_MACRO, then this field is the macro identifier. */
313 insn_t mask;
314 /* A function to determine if a word corresponds to this instruction.
315 Usually, this computes ((word & mask) == match). */
316 int (*match_func) (const struct riscv_opcode *op, insn_t word);
317 /* For a macro, this is INSN_MACRO. Otherwise, it is a collection
318 of bits describing the instruction, notably any relevant hazard
319 information. */
320 unsigned long pinfo;
321 };
322
323 /* Instruction is a simple alias (e.g. "mv" for "addi"). */
324 #define INSN_ALIAS 0x00000001
325
326 /* These are for setting insn_info fields.
327
328 Nonbranch is the default. Noninsn is used only if there is no match.
329 There are no condjsr or dref2 instructions. So that leaves condbranch,
330 branch, jsr, and dref that we need to handle here, encoded in 3 bits. */
331 #define INSN_TYPE 0x0000000e
332
333 /* Instruction is an unconditional branch. */
334 #define INSN_BRANCH 0x00000002
335 /* Instruction is a conditional branch. */
336 #define INSN_CONDBRANCH 0x00000004
337 /* Instruction is a jump to subroutine. */
338 #define INSN_JSR 0x00000006
339 /* Instruction is a data reference. */
340 #define INSN_DREF 0x00000008
341
342 /* We have 5 data reference sizes, which we can encode in 3 bits. */
343 #define INSN_DATA_SIZE 0x00000070
344 #define INSN_DATA_SIZE_SHIFT 4
345 #define INSN_1_BYTE 0x00000010
346 #define INSN_2_BYTE 0x00000020
347 #define INSN_4_BYTE 0x00000030
348 #define INSN_8_BYTE 0x00000040
349 #define INSN_16_BYTE 0x00000050
350
351 /* Instruction is actually a macro. It should be ignored by the
352 disassembler, and requires special treatment by the assembler. */
353 #define INSN_MACRO 0xffffffff
354
355 /* This is a list of macro expanded instructions.
356
357 _I appended means immediate
358 _A appended means address
359 _AB appended means address with base register
360 _D appended means 64 bit floating point constant
361 _S appended means 32 bit floating point constant. */
362
363 enum
364 {
365 M_LA,
366 M_LLA,
367 M_LA_TLS_GD,
368 M_LA_TLS_IE,
369 M_LB,
370 M_LBU,
371 M_LH,
372 M_LHU,
373 M_LW,
374 M_LWU,
375 M_LD,
376 M_SB,
377 M_SH,
378 M_SW,
379 M_SD,
380 M_FLW,
381 M_FLD,
382 M_FLQ,
383 M_FSW,
384 M_FSD,
385 M_FSQ,
386 M_CALL,
387 M_J,
388 M_LI,
389 M_NUM_MACROS
390 };
391
392
393 extern const char * const riscv_gpr_names_numeric[NGPR];
394 extern const char * const riscv_gpr_names_abi[NGPR];
395 extern const char * const riscv_fpr_names_numeric[NFPR];
396 extern const char * const riscv_fpr_names_abi[NFPR];
397
398 extern const struct riscv_opcode riscv_opcodes[];
399 extern const struct riscv_opcode riscv_insn_types[];
400
401 #endif /* _RISCV_H_ */