1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2020 SiFive
4 */
5
6 #ifndef _ASM_RISCV_INSN_H
7 #define _ASM_RISCV_INSN_H
8
9 #include <linux/bits.h>
10
11 #define RV_INSN_FUNCT3_MASK GENMASK(14, 12)
12 #define RV_INSN_FUNCT3_OPOFF 12
13 #define RV_INSN_OPCODE_MASK GENMASK(6, 0)
14 #define RV_INSN_OPCODE_OPOFF 0
15 #define RV_INSN_FUNCT12_OPOFF 20
16
17 #define RV_ENCODE_FUNCT3(f_) (RVG_FUNCT3_##f_ << RV_INSN_FUNCT3_OPOFF)
18 #define RV_ENCODE_FUNCT12(f_) (RVG_FUNCT12_##f_ << RV_INSN_FUNCT12_OPOFF)
19
20 /* The bit field of immediate value in I-type instruction */
21 #define RV_I_IMM_SIGN_OPOFF 31
22 #define RV_I_IMM_11_0_OPOFF 20
23 #define RV_I_IMM_SIGN_OFF 12
24 #define RV_I_IMM_11_0_OFF 0
25 #define RV_I_IMM_11_0_MASK GENMASK(11, 0)
26
27 /* The bit field of immediate value in J-type instruction */
28 #define RV_J_IMM_SIGN_OPOFF 31
29 #define RV_J_IMM_10_1_OPOFF 21
30 #define RV_J_IMM_11_OPOFF 20
31 #define RV_J_IMM_19_12_OPOFF 12
32 #define RV_J_IMM_SIGN_OFF 20
33 #define RV_J_IMM_10_1_OFF 1
34 #define RV_J_IMM_11_OFF 11
35 #define RV_J_IMM_19_12_OFF 12
36 #define RV_J_IMM_10_1_MASK GENMASK(9, 0)
37 #define RV_J_IMM_11_MASK GENMASK(0, 0)
38 #define RV_J_IMM_19_12_MASK GENMASK(7, 0)
39
40 /*
41 * U-type IMMs contain the upper 20bits [31:20] of an immediate with
42 * the rest filled in by zeros, so no shifting required. Similarly,
43 * bit31 contains the signed state, so no sign extension necessary.
44 */
45 #define RV_U_IMM_SIGN_OPOFF 31
46 #define RV_U_IMM_31_12_OPOFF 0
47 #define RV_U_IMM_31_12_MASK GENMASK(31, 12)
48
49 /* The bit field of immediate value in B-type instruction */
50 #define RV_B_IMM_SIGN_OPOFF 31
51 #define RV_B_IMM_10_5_OPOFF 25
52 #define RV_B_IMM_4_1_OPOFF 8
53 #define RV_B_IMM_11_OPOFF 7
54 #define RV_B_IMM_SIGN_OFF 12
55 #define RV_B_IMM_10_5_OFF 5
56 #define RV_B_IMM_4_1_OFF 1
57 #define RV_B_IMM_11_OFF 11
58 #define RV_B_IMM_10_5_MASK GENMASK(5, 0)
59 #define RV_B_IMM_4_1_MASK GENMASK(3, 0)
60 #define RV_B_IMM_11_MASK GENMASK(0, 0)
61
62 /* The register offset in RVG instruction */
63 #define RVG_RS1_OPOFF 15
64 #define RVG_RS2_OPOFF 20
65 #define RVG_RD_OPOFF 7
66 #define RVG_RD_MASK GENMASK(4, 0)
67
68 /* The bit field of immediate value in RVC J instruction */
69 #define RVC_J_IMM_SIGN_OPOFF 12
70 #define RVC_J_IMM_4_OPOFF 11
71 #define RVC_J_IMM_9_8_OPOFF 9
72 #define RVC_J_IMM_10_OPOFF 8
73 #define RVC_J_IMM_6_OPOFF 7
74 #define RVC_J_IMM_7_OPOFF 6
75 #define RVC_J_IMM_3_1_OPOFF 3
76 #define RVC_J_IMM_5_OPOFF 2
77 #define RVC_J_IMM_SIGN_OFF 11
78 #define RVC_J_IMM_4_OFF 4
79 #define RVC_J_IMM_9_8_OFF 8
80 #define RVC_J_IMM_10_OFF 10
81 #define RVC_J_IMM_6_OFF 6
82 #define RVC_J_IMM_7_OFF 7
83 #define RVC_J_IMM_3_1_OFF 1
84 #define RVC_J_IMM_5_OFF 5
85 #define RVC_J_IMM_4_MASK GENMASK(0, 0)
86 #define RVC_J_IMM_9_8_MASK GENMASK(1, 0)
87 #define RVC_J_IMM_10_MASK GENMASK(0, 0)
88 #define RVC_J_IMM_6_MASK GENMASK(0, 0)
89 #define RVC_J_IMM_7_MASK GENMASK(0, 0)
90 #define RVC_J_IMM_3_1_MASK GENMASK(2, 0)
91 #define RVC_J_IMM_5_MASK GENMASK(0, 0)
92
93 /* The bit field of immediate value in RVC B instruction */
94 #define RVC_B_IMM_SIGN_OPOFF 12
95 #define RVC_B_IMM_4_3_OPOFF 10
96 #define RVC_B_IMM_7_6_OPOFF 5
97 #define RVC_B_IMM_2_1_OPOFF 3
98 #define RVC_B_IMM_5_OPOFF 2
99 #define RVC_B_IMM_SIGN_OFF 8
100 #define RVC_B_IMM_4_3_OFF 3
101 #define RVC_B_IMM_7_6_OFF 6
102 #define RVC_B_IMM_2_1_OFF 1
103 #define RVC_B_IMM_5_OFF 5
104 #define RVC_B_IMM_4_3_MASK GENMASK(1, 0)
105 #define RVC_B_IMM_7_6_MASK GENMASK(1, 0)
106 #define RVC_B_IMM_2_1_MASK GENMASK(1, 0)
107 #define RVC_B_IMM_5_MASK GENMASK(0, 0)
108
109 #define RVC_INSN_FUNCT4_MASK GENMASK(15, 12)
110 #define RVC_INSN_FUNCT4_OPOFF 12
111 #define RVC_INSN_FUNCT3_MASK GENMASK(15, 13)
112 #define RVC_INSN_FUNCT3_OPOFF 13
113 #define RVC_INSN_J_RS2_MASK GENMASK(6, 2)
114 #define RVC_INSN_OPCODE_MASK GENMASK(1, 0)
115 #define RVC_ENCODE_FUNCT3(f_) (RVC_FUNCT3_##f_ << RVC_INSN_FUNCT3_OPOFF)
116 #define RVC_ENCODE_FUNCT4(f_) (RVC_FUNCT4_##f_ << RVC_INSN_FUNCT4_OPOFF)
117
118 /* The register offset in RVC op=C0 instruction */
119 #define RVC_C0_RS1_OPOFF 7
120 #define RVC_C0_RS2_OPOFF 2
121 #define RVC_C0_RD_OPOFF 2
122
123 /* The register offset in RVC op=C1 instruction */
124 #define RVC_C1_RS1_OPOFF 7
125 #define RVC_C1_RS2_OPOFF 2
126 #define RVC_C1_RD_OPOFF 7
127
128 /* The register offset in RVC op=C2 instruction */
129 #define RVC_C2_RS1_OPOFF 7
130 #define RVC_C2_RS2_OPOFF 2
131 #define RVC_C2_RD_OPOFF 7
132
133 /* parts of opcode for RVG*/
134 #define RVG_OPCODE_FENCE 0x0f
135 #define RVG_OPCODE_AUIPC 0x17
136 #define RVG_OPCODE_BRANCH 0x63
137 #define RVG_OPCODE_JALR 0x67
138 #define RVG_OPCODE_JAL 0x6f
139 #define RVG_OPCODE_SYSTEM 0x73
140
141 /* parts of opcode for RVC*/
142 #define RVC_OPCODE_C0 0x0
143 #define RVC_OPCODE_C1 0x1
144 #define RVC_OPCODE_C2 0x2
145
146 /* parts of funct3 code for I, M, A extension*/
147 #define RVG_FUNCT3_JALR 0x0
148 #define RVG_FUNCT3_BEQ 0x0
149 #define RVG_FUNCT3_BNE 0x1
150 #define RVG_FUNCT3_BLT 0x4
151 #define RVG_FUNCT3_BGE 0x5
152 #define RVG_FUNCT3_BLTU 0x6
153 #define RVG_FUNCT3_BGEU 0x7
154
155 /* parts of funct3 code for C extension*/
156 #define RVC_FUNCT3_C_BEQZ 0x6
157 #define RVC_FUNCT3_C_BNEZ 0x7
158 #define RVC_FUNCT3_C_J 0x5
159 #define RVC_FUNCT3_C_JAL 0x1
160 #define RVC_FUNCT4_C_JR 0x8
161 #define RVC_FUNCT4_C_JALR 0x9
162 #define RVC_FUNCT4_C_EBREAK 0x9
163
164 #define RVG_FUNCT12_EBREAK 0x1
165 #define RVG_FUNCT12_SRET 0x102
166
167 #define RVG_MATCH_AUIPC (RVG_OPCODE_AUIPC)
168 #define RVG_MATCH_JALR (RV_ENCODE_FUNCT3(JALR) | RVG_OPCODE_JALR)
169 #define RVG_MATCH_JAL (RVG_OPCODE_JAL)
170 #define RVG_MATCH_FENCE (RVG_OPCODE_FENCE)
171 #define RVG_MATCH_BEQ (RV_ENCODE_FUNCT3(BEQ) | RVG_OPCODE_BRANCH)
172 #define RVG_MATCH_BNE (RV_ENCODE_FUNCT3(BNE) | RVG_OPCODE_BRANCH)
173 #define RVG_MATCH_BLT (RV_ENCODE_FUNCT3(BLT) | RVG_OPCODE_BRANCH)
174 #define RVG_MATCH_BGE (RV_ENCODE_FUNCT3(BGE) | RVG_OPCODE_BRANCH)
175 #define RVG_MATCH_BLTU (RV_ENCODE_FUNCT3(BLTU) | RVG_OPCODE_BRANCH)
176 #define RVG_MATCH_BGEU (RV_ENCODE_FUNCT3(BGEU) | RVG_OPCODE_BRANCH)
177 #define RVG_MATCH_EBREAK (RV_ENCODE_FUNCT12(EBREAK) | RVG_OPCODE_SYSTEM)
178 #define RVG_MATCH_SRET (RV_ENCODE_FUNCT12(SRET) | RVG_OPCODE_SYSTEM)
179 #define RVC_MATCH_C_BEQZ (RVC_ENCODE_FUNCT3(C_BEQZ) | RVC_OPCODE_C1)
180 #define RVC_MATCH_C_BNEZ (RVC_ENCODE_FUNCT3(C_BNEZ) | RVC_OPCODE_C1)
181 #define RVC_MATCH_C_J (RVC_ENCODE_FUNCT3(C_J) | RVC_OPCODE_C1)
182 #define RVC_MATCH_C_JAL (RVC_ENCODE_FUNCT3(C_JAL) | RVC_OPCODE_C1)
183 #define RVC_MATCH_C_JR (RVC_ENCODE_FUNCT4(C_JR) | RVC_OPCODE_C2)
184 #define RVC_MATCH_C_JALR (RVC_ENCODE_FUNCT4(C_JALR) | RVC_OPCODE_C2)
185 #define RVC_MATCH_C_EBREAK (RVC_ENCODE_FUNCT4(C_EBREAK) | RVC_OPCODE_C2)
186
187 #define RVG_MASK_AUIPC (RV_INSN_OPCODE_MASK)
188 #define RVG_MASK_JALR (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
189 #define RVG_MASK_JAL (RV_INSN_OPCODE_MASK)
190 #define RVG_MASK_FENCE (RV_INSN_OPCODE_MASK)
191 #define RVC_MASK_C_JALR (RVC_INSN_FUNCT4_MASK | RVC_INSN_J_RS2_MASK | RVC_INSN_OPCODE_MASK)
192 #define RVC_MASK_C_JR (RVC_INSN_FUNCT4_MASK | RVC_INSN_J_RS2_MASK | RVC_INSN_OPCODE_MASK)
193 #define RVC_MASK_C_JAL (RVC_INSN_FUNCT3_MASK | RVC_INSN_OPCODE_MASK)
194 #define RVC_MASK_C_J (RVC_INSN_FUNCT3_MASK | RVC_INSN_OPCODE_MASK)
195 #define RVG_MASK_BEQ (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
196 #define RVG_MASK_BNE (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
197 #define RVG_MASK_BLT (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
198 #define RVG_MASK_BGE (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
199 #define RVG_MASK_BLTU (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
200 #define RVG_MASK_BGEU (RV_INSN_FUNCT3_MASK | RV_INSN_OPCODE_MASK)
201 #define RVC_MASK_C_BEQZ (RVC_INSN_FUNCT3_MASK | RVC_INSN_OPCODE_MASK)
202 #define RVC_MASK_C_BNEZ (RVC_INSN_FUNCT3_MASK | RVC_INSN_OPCODE_MASK)
203 #define RVC_MASK_C_EBREAK 0xffff
204 #define RVG_MASK_EBREAK 0xffffffff
205 #define RVG_MASK_SRET 0xffffffff
206
207 #define __INSN_LENGTH_MASK _UL(0x3)
208 #define __INSN_LENGTH_GE_32 _UL(0x3)
209 #define __INSN_OPCODE_MASK _UL(0x7F)
210 #define __INSN_BRANCH_OPCODE _UL(RVG_OPCODE_BRANCH)
211
212 #define __RISCV_INSN_FUNCS(name, mask, val) \
213 static __always_inline bool riscv_insn_is_##name(u32 code) \
214 { \
215 BUILD_BUG_ON(~(mask) & (val)); \
216 return (code & (mask)) == (val); \
217 } \
218
219 #if __riscv_xlen == 32
220 /* C.JAL is an RV32C-only instruction */
221 __RISCV_INSN_FUNCS(c_jal, RVC_MASK_C_JAL, RVC_MATCH_C_JAL)
222 #else
223 #define riscv_insn_is_c_jal(opcode) 0
224 #endif
225 __RISCV_INSN_FUNCS(auipc, RVG_MASK_AUIPC, RVG_MATCH_AUIPC)
226 __RISCV_INSN_FUNCS(jalr, RVG_MASK_JALR, RVG_MATCH_JALR)
227 __RISCV_INSN_FUNCS(jal, RVG_MASK_JAL, RVG_MATCH_JAL)
228 __RISCV_INSN_FUNCS(c_jr, RVC_MASK_C_JR, RVC_MATCH_C_JR)
229 __RISCV_INSN_FUNCS(c_jalr, RVC_MASK_C_JALR, RVC_MATCH_C_JALR)
230 __RISCV_INSN_FUNCS(c_j, RVC_MASK_C_J, RVC_MATCH_C_J)
231 __RISCV_INSN_FUNCS(beq, RVG_MASK_BEQ, RVG_MATCH_BEQ)
232 __RISCV_INSN_FUNCS(bne, RVG_MASK_BNE, RVG_MATCH_BNE)
233 __RISCV_INSN_FUNCS(blt, RVG_MASK_BLT, RVG_MATCH_BLT)
234 __RISCV_INSN_FUNCS(bge, RVG_MASK_BGE, RVG_MATCH_BGE)
235 __RISCV_INSN_FUNCS(bltu, RVG_MASK_BLTU, RVG_MATCH_BLTU)
236 __RISCV_INSN_FUNCS(bgeu, RVG_MASK_BGEU, RVG_MATCH_BGEU)
237 __RISCV_INSN_FUNCS(c_beqz, RVC_MASK_C_BEQZ, RVC_MATCH_C_BEQZ)
238 __RISCV_INSN_FUNCS(c_bnez, RVC_MASK_C_BNEZ, RVC_MATCH_C_BNEZ)
239 __RISCV_INSN_FUNCS(c_ebreak, RVC_MASK_C_EBREAK, RVC_MATCH_C_EBREAK)
240 __RISCV_INSN_FUNCS(ebreak, RVG_MASK_EBREAK, RVG_MATCH_EBREAK)
241 __RISCV_INSN_FUNCS(sret, RVG_MASK_SRET, RVG_MATCH_SRET)
242 __RISCV_INSN_FUNCS(fence, RVG_MASK_FENCE, RVG_MATCH_FENCE);
243
244 /* special case to catch _any_ system instruction */
riscv_insn_is_system(u32 code)245 static __always_inline bool riscv_insn_is_system(u32 code)
246 {
247 return (code & RV_INSN_OPCODE_MASK) == RVG_OPCODE_SYSTEM;
248 }
249
250 /* special case to catch _any_ branch instruction */
riscv_insn_is_branch(u32 code)251 static __always_inline bool riscv_insn_is_branch(u32 code)
252 {
253 return (code & RV_INSN_OPCODE_MASK) == RVG_OPCODE_BRANCH;
254 }
255
256 #define RV_IMM_SIGN(x) (-(((x) >> 31) & 1))
257 #define RVC_IMM_SIGN(x) (-(((x) >> 12) & 1))
258 #define RV_X(X, s, mask) (((X) >> (s)) & (mask))
259 #define RVC_X(X, s, mask) RV_X(X, s, mask)
260
261 #define RV_EXTRACT_RD_REG(x) \
262 ({typeof(x) x_ = (x); \
263 (RV_X(x_, RVG_RD_OPOFF, RVG_RD_MASK)); })
264
265 #define RV_EXTRACT_UTYPE_IMM(x) \
266 ({typeof(x) x_ = (x); \
267 (RV_X(x_, RV_U_IMM_31_12_OPOFF, RV_U_IMM_31_12_MASK)); })
268
269 #define RV_EXTRACT_JTYPE_IMM(x) \
270 ({typeof(x) x_ = (x); \
271 (RV_X(x_, RV_J_IMM_10_1_OPOFF, RV_J_IMM_10_1_MASK) << RV_J_IMM_10_1_OFF) | \
272 (RV_X(x_, RV_J_IMM_11_OPOFF, RV_J_IMM_11_MASK) << RV_J_IMM_11_OFF) | \
273 (RV_X(x_, RV_J_IMM_19_12_OPOFF, RV_J_IMM_19_12_MASK) << RV_J_IMM_19_12_OFF) | \
274 (RV_IMM_SIGN(x_) << RV_J_IMM_SIGN_OFF); })
275
276 #define RV_EXTRACT_ITYPE_IMM(x) \
277 ({typeof(x) x_ = (x); \
278 (RV_X(x_, RV_I_IMM_11_0_OPOFF, RV_I_IMM_11_0_MASK)) | \
279 (RV_IMM_SIGN(x_) << RV_I_IMM_SIGN_OFF); })
280
281 #define RV_EXTRACT_BTYPE_IMM(x) \
282 ({typeof(x) x_ = (x); \
283 (RV_X(x_, RV_B_IMM_4_1_OPOFF, RV_B_IMM_4_1_MASK) << RV_B_IMM_4_1_OFF) | \
284 (RV_X(x_, RV_B_IMM_10_5_OPOFF, RV_B_IMM_10_5_MASK) << RV_B_IMM_10_5_OFF) | \
285 (RV_X(x_, RV_B_IMM_11_OPOFF, RV_B_IMM_11_MASK) << RV_B_IMM_11_OFF) | \
286 (RV_IMM_SIGN(x_) << RV_B_IMM_SIGN_OFF); })
287
288 #define RVC_EXTRACT_JTYPE_IMM(x) \
289 ({typeof(x) x_ = (x); \
290 (RVC_X(x_, RVC_J_IMM_3_1_OPOFF, RVC_J_IMM_3_1_MASK) << RVC_J_IMM_3_1_OFF) | \
291 (RVC_X(x_, RVC_J_IMM_4_OPOFF, RVC_J_IMM_4_MASK) << RVC_J_IMM_4_OFF) | \
292 (RVC_X(x_, RVC_J_IMM_5_OPOFF, RVC_J_IMM_5_MASK) << RVC_J_IMM_5_OFF) | \
293 (RVC_X(x_, RVC_J_IMM_6_OPOFF, RVC_J_IMM_6_MASK) << RVC_J_IMM_6_OFF) | \
294 (RVC_X(x_, RVC_J_IMM_7_OPOFF, RVC_J_IMM_7_MASK) << RVC_J_IMM_7_OFF) | \
295 (RVC_X(x_, RVC_J_IMM_9_8_OPOFF, RVC_J_IMM_9_8_MASK) << RVC_J_IMM_9_8_OFF) | \
296 (RVC_X(x_, RVC_J_IMM_10_OPOFF, RVC_J_IMM_10_MASK) << RVC_J_IMM_10_OFF) | \
297 (RVC_IMM_SIGN(x_) << RVC_J_IMM_SIGN_OFF); })
298
299 #define RVC_EXTRACT_BTYPE_IMM(x) \
300 ({typeof(x) x_ = (x); \
301 (RVC_X(x_, RVC_B_IMM_2_1_OPOFF, RVC_B_IMM_2_1_MASK) << RVC_B_IMM_2_1_OFF) | \
302 (RVC_X(x_, RVC_B_IMM_4_3_OPOFF, RVC_B_IMM_4_3_MASK) << RVC_B_IMM_4_3_OFF) | \
303 (RVC_X(x_, RVC_B_IMM_5_OPOFF, RVC_B_IMM_5_MASK) << RVC_B_IMM_5_OFF) | \
304 (RVC_X(x_, RVC_B_IMM_7_6_OPOFF, RVC_B_IMM_7_6_MASK) << RVC_B_IMM_7_6_OFF) | \
305 (RVC_IMM_SIGN(x_) << RVC_B_IMM_SIGN_OFF); })
306
307 /*
308 * Get the immediate from a J-type instruction.
309 *
310 * @insn: instruction to process
311 * Return: immediate
312 */
riscv_insn_extract_jtype_imm(u32 insn)313 static inline s32 riscv_insn_extract_jtype_imm(u32 insn)
314 {
315 return RV_EXTRACT_JTYPE_IMM(insn);
316 }
317
318 /*
319 * Update a J-type instruction with an immediate value.
320 *
321 * @insn: pointer to the jtype instruction
322 * @imm: the immediate to insert into the instruction
323 */
riscv_insn_insert_jtype_imm(u32 * insn,s32 imm)324 static inline void riscv_insn_insert_jtype_imm(u32 *insn, s32 imm)
325 {
326 /* drop the old IMMs, all jal IMM bits sit at 31:12 */
327 *insn &= ~GENMASK(31, 12);
328 *insn |= (RV_X(imm, RV_J_IMM_10_1_OFF, RV_J_IMM_10_1_MASK) << RV_J_IMM_10_1_OPOFF) |
329 (RV_X(imm, RV_J_IMM_11_OFF, RV_J_IMM_11_MASK) << RV_J_IMM_11_OPOFF) |
330 (RV_X(imm, RV_J_IMM_19_12_OFF, RV_J_IMM_19_12_MASK) << RV_J_IMM_19_12_OPOFF) |
331 (RV_X(imm, RV_J_IMM_SIGN_OFF, 1) << RV_J_IMM_SIGN_OPOFF);
332 }
333
334 /*
335 * Put together one immediate from a U-type and I-type instruction pair.
336 *
337 * The U-type contains an upper immediate, meaning bits[31:12] with [11:0]
338 * being zero, while the I-type contains a 12bit immediate.
339 * Combined these can encode larger 32bit values and are used for example
340 * in auipc + jalr pairs to allow larger jumps.
341 *
342 * @utype_insn: instruction containing the upper immediate
343 * @itype_insn: instruction
344 * Return: combined immediate
345 */
riscv_insn_extract_utype_itype_imm(u32 utype_insn,u32 itype_insn)346 static inline s32 riscv_insn_extract_utype_itype_imm(u32 utype_insn, u32 itype_insn)
347 {
348 s32 imm;
349
350 imm = RV_EXTRACT_UTYPE_IMM(utype_insn);
351 imm += RV_EXTRACT_ITYPE_IMM(itype_insn);
352
353 return imm;
354 }
355
356 /*
357 * Update a set of two instructions (U-type + I-type) with an immediate value.
358 *
359 * Used for example in auipc+jalrs pairs the U-type instructions contains
360 * a 20bit upper immediate representing bits[31:12], while the I-type
361 * instruction contains a 12bit immediate representing bits[11:0].
362 *
363 * This also takes into account that both separate immediates are
364 * considered as signed values, so if the I-type immediate becomes
365 * negative (BIT(11) set) the U-type part gets adjusted.
366 *
367 * @utype_insn: pointer to the utype instruction of the pair
368 * @itype_insn: pointer to the itype instruction of the pair
369 * @imm: the immediate to insert into the two instructions
370 */
riscv_insn_insert_utype_itype_imm(u32 * utype_insn,u32 * itype_insn,s32 imm)371 static inline void riscv_insn_insert_utype_itype_imm(u32 *utype_insn, u32 *itype_insn, s32 imm)
372 {
373 /* drop possible old IMM values */
374 *utype_insn &= ~(RV_U_IMM_31_12_MASK);
375 *itype_insn &= ~(RV_I_IMM_11_0_MASK << RV_I_IMM_11_0_OPOFF);
376
377 /* add the adapted IMMs */
378 *utype_insn |= (imm & RV_U_IMM_31_12_MASK) + ((imm & BIT(11)) << 1);
379 *itype_insn |= ((imm & RV_I_IMM_11_0_MASK) << RV_I_IMM_11_0_OPOFF);
380 }
381 #endif /* _ASM_RISCV_INSN_H */
382