| 1 | /* |
| 2 | * Copyright (C) 2013 Huawei Ltd. |
| 3 | * Author: Jiang Liu <liuj97@gmail.com> |
| 4 | * |
| 5 | * Copyright (C) 2014 Zi Shen Lim <zlim.lnx@gmail.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | #include <linux/bitops.h> |
| 20 | #include <linux/bug.h> |
| 21 | #include <linux/compiler.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/mm.h> |
| 24 | #include <linux/smp.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/stop_machine.h> |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/uaccess.h> |
| 29 | |
| 30 | #include <asm/cacheflush.h> |
| 31 | #include <asm/debug-monitors.h> |
| 32 | #include <asm/fixmap.h> |
| 33 | #include <asm/insn.h> |
| 34 | |
| 35 | #define AARCH64_INSN_SF_BIT BIT(31) |
| 36 | #define AARCH64_INSN_N_BIT BIT(22) |
| 37 | |
| 38 | static int aarch64_insn_encoding_class[] = { |
| 39 | AARCH64_INSN_CLS_UNKNOWN, |
| 40 | AARCH64_INSN_CLS_UNKNOWN, |
| 41 | AARCH64_INSN_CLS_UNKNOWN, |
| 42 | AARCH64_INSN_CLS_UNKNOWN, |
| 43 | AARCH64_INSN_CLS_LDST, |
| 44 | AARCH64_INSN_CLS_DP_REG, |
| 45 | AARCH64_INSN_CLS_LDST, |
| 46 | AARCH64_INSN_CLS_DP_FPSIMD, |
| 47 | AARCH64_INSN_CLS_DP_IMM, |
| 48 | AARCH64_INSN_CLS_DP_IMM, |
| 49 | AARCH64_INSN_CLS_BR_SYS, |
| 50 | AARCH64_INSN_CLS_BR_SYS, |
| 51 | AARCH64_INSN_CLS_LDST, |
| 52 | AARCH64_INSN_CLS_DP_REG, |
| 53 | AARCH64_INSN_CLS_LDST, |
| 54 | AARCH64_INSN_CLS_DP_FPSIMD, |
| 55 | }; |
| 56 | |
| 57 | enum aarch64_insn_encoding_class __kprobes aarch64_get_insn_class(u32 insn) |
| 58 | { |
| 59 | return aarch64_insn_encoding_class[(insn >> 25) & 0xf]; |
| 60 | } |
| 61 | |
| 62 | /* NOP is an alias of HINT */ |
| 63 | bool __kprobes aarch64_insn_is_nop(u32 insn) |
| 64 | { |
| 65 | if (!aarch64_insn_is_hint(insn)) |
| 66 | return false; |
| 67 | |
| 68 | switch (insn & 0xFE0) { |
| 69 | case AARCH64_INSN_HINT_YIELD: |
| 70 | case AARCH64_INSN_HINT_WFE: |
| 71 | case AARCH64_INSN_HINT_WFI: |
| 72 | case AARCH64_INSN_HINT_SEV: |
| 73 | case AARCH64_INSN_HINT_SEVL: |
| 74 | return false; |
| 75 | default: |
| 76 | return true; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | static DEFINE_SPINLOCK(patch_lock); |
| 81 | |
| 82 | static void __kprobes *patch_map(void *addr, int fixmap) |
| 83 | { |
| 84 | unsigned long uintaddr = (uintptr_t) addr; |
| 85 | bool module = !core_kernel_text(uintaddr); |
| 86 | struct page *page; |
| 87 | |
| 88 | if (module && IS_ENABLED(CONFIG_DEBUG_SET_MODULE_RONX)) |
| 89 | page = vmalloc_to_page(addr); |
| 90 | else if (!module && IS_ENABLED(CONFIG_DEBUG_RODATA)) |
| 91 | page = virt_to_page(addr); |
| 92 | else |
| 93 | return addr; |
| 94 | |
| 95 | BUG_ON(!page); |
| 96 | set_fixmap(fixmap, page_to_phys(page)); |
| 97 | |
| 98 | return (void *) (__fix_to_virt(fixmap) + (uintaddr & ~PAGE_MASK)); |
| 99 | } |
| 100 | |
| 101 | static void __kprobes patch_unmap(int fixmap) |
| 102 | { |
| 103 | clear_fixmap(fixmap); |
| 104 | } |
| 105 | /* |
| 106 | * In ARMv8-A, A64 instructions have a fixed length of 32 bits and are always |
| 107 | * little-endian. |
| 108 | */ |
| 109 | int __kprobes aarch64_insn_read(void *addr, u32 *insnp) |
| 110 | { |
| 111 | int ret; |
| 112 | u32 val; |
| 113 | |
| 114 | ret = probe_kernel_read(&val, addr, AARCH64_INSN_SIZE); |
| 115 | if (!ret) |
| 116 | *insnp = le32_to_cpu(val); |
| 117 | |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | static int __kprobes __aarch64_insn_write(void *addr, u32 insn) |
| 122 | { |
| 123 | void *waddr = addr; |
| 124 | unsigned long flags = 0; |
| 125 | int ret; |
| 126 | |
| 127 | spin_lock_irqsave(&patch_lock, flags); |
| 128 | waddr = patch_map(addr, FIX_TEXT_POKE0); |
| 129 | |
| 130 | ret = probe_kernel_write(waddr, &insn, AARCH64_INSN_SIZE); |
| 131 | |
| 132 | patch_unmap(FIX_TEXT_POKE0); |
| 133 | spin_unlock_irqrestore(&patch_lock, flags); |
| 134 | |
| 135 | return ret; |
| 136 | } |
| 137 | |
| 138 | int __kprobes aarch64_insn_write(void *addr, u32 insn) |
| 139 | { |
| 140 | insn = cpu_to_le32(insn); |
| 141 | return __aarch64_insn_write(addr, insn); |
| 142 | } |
| 143 | |
| 144 | static bool __kprobes __aarch64_insn_hotpatch_safe(u32 insn) |
| 145 | { |
| 146 | if (aarch64_get_insn_class(insn) != AARCH64_INSN_CLS_BR_SYS) |
| 147 | return false; |
| 148 | |
| 149 | return aarch64_insn_is_b(insn) || |
| 150 | aarch64_insn_is_bl(insn) || |
| 151 | aarch64_insn_is_svc(insn) || |
| 152 | aarch64_insn_is_hvc(insn) || |
| 153 | aarch64_insn_is_smc(insn) || |
| 154 | aarch64_insn_is_brk(insn) || |
| 155 | aarch64_insn_is_nop(insn); |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * ARM Architecture Reference Manual for ARMv8 Profile-A, Issue A.a |
| 160 | * Section B2.6.5 "Concurrent modification and execution of instructions": |
| 161 | * Concurrent modification and execution of instructions can lead to the |
| 162 | * resulting instruction performing any behavior that can be achieved by |
| 163 | * executing any sequence of instructions that can be executed from the |
| 164 | * same Exception level, except where the instruction before modification |
| 165 | * and the instruction after modification is a B, BL, NOP, BKPT, SVC, HVC, |
| 166 | * or SMC instruction. |
| 167 | */ |
| 168 | bool __kprobes aarch64_insn_hotpatch_safe(u32 old_insn, u32 new_insn) |
| 169 | { |
| 170 | return __aarch64_insn_hotpatch_safe(old_insn) && |
| 171 | __aarch64_insn_hotpatch_safe(new_insn); |
| 172 | } |
| 173 | |
| 174 | int __kprobes aarch64_insn_patch_text_nosync(void *addr, u32 insn) |
| 175 | { |
| 176 | u32 *tp = addr; |
| 177 | int ret; |
| 178 | |
| 179 | /* A64 instructions must be word aligned */ |
| 180 | if ((uintptr_t)tp & 0x3) |
| 181 | return -EINVAL; |
| 182 | |
| 183 | ret = aarch64_insn_write(tp, insn); |
| 184 | if (ret == 0) |
| 185 | flush_icache_range((uintptr_t)tp, |
| 186 | (uintptr_t)tp + AARCH64_INSN_SIZE); |
| 187 | |
| 188 | return ret; |
| 189 | } |
| 190 | |
| 191 | struct aarch64_insn_patch { |
| 192 | void **text_addrs; |
| 193 | u32 *new_insns; |
| 194 | int insn_cnt; |
| 195 | atomic_t cpu_count; |
| 196 | }; |
| 197 | |
| 198 | static int __kprobes aarch64_insn_patch_text_cb(void *arg) |
| 199 | { |
| 200 | int i, ret = 0; |
| 201 | struct aarch64_insn_patch *pp = arg; |
| 202 | |
| 203 | /* The first CPU becomes master */ |
| 204 | if (atomic_inc_return(&pp->cpu_count) == 1) { |
| 205 | for (i = 0; ret == 0 && i < pp->insn_cnt; i++) |
| 206 | ret = aarch64_insn_patch_text_nosync(pp->text_addrs[i], |
| 207 | pp->new_insns[i]); |
| 208 | /* |
| 209 | * aarch64_insn_patch_text_nosync() calls flush_icache_range(), |
| 210 | * which ends with "dsb; isb" pair guaranteeing global |
| 211 | * visibility. |
| 212 | */ |
| 213 | /* Notify other processors with an additional increment. */ |
| 214 | atomic_inc(&pp->cpu_count); |
| 215 | } else { |
| 216 | while (atomic_read(&pp->cpu_count) <= num_online_cpus()) |
| 217 | cpu_relax(); |
| 218 | isb(); |
| 219 | } |
| 220 | |
| 221 | return ret; |
| 222 | } |
| 223 | |
| 224 | int __kprobes aarch64_insn_patch_text_sync(void *addrs[], u32 insns[], int cnt) |
| 225 | { |
| 226 | struct aarch64_insn_patch patch = { |
| 227 | .text_addrs = addrs, |
| 228 | .new_insns = insns, |
| 229 | .insn_cnt = cnt, |
| 230 | .cpu_count = ATOMIC_INIT(0), |
| 231 | }; |
| 232 | |
| 233 | if (cnt <= 0) |
| 234 | return -EINVAL; |
| 235 | |
| 236 | return stop_machine(aarch64_insn_patch_text_cb, &patch, |
| 237 | cpu_online_mask); |
| 238 | } |
| 239 | |
| 240 | int __kprobes aarch64_insn_patch_text(void *addrs[], u32 insns[], int cnt) |
| 241 | { |
| 242 | int ret; |
| 243 | u32 insn; |
| 244 | |
| 245 | /* Unsafe to patch multiple instructions without synchronizaiton */ |
| 246 | if (cnt == 1) { |
| 247 | ret = aarch64_insn_read(addrs[0], &insn); |
| 248 | if (ret) |
| 249 | return ret; |
| 250 | |
| 251 | if (aarch64_insn_hotpatch_safe(insn, insns[0])) { |
| 252 | /* |
| 253 | * ARMv8 architecture doesn't guarantee all CPUs see |
| 254 | * the new instruction after returning from function |
| 255 | * aarch64_insn_patch_text_nosync(). So send IPIs to |
| 256 | * all other CPUs to achieve instruction |
| 257 | * synchronization. |
| 258 | */ |
| 259 | ret = aarch64_insn_patch_text_nosync(addrs[0], insns[0]); |
| 260 | kick_all_cpus_sync(); |
| 261 | return ret; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | return aarch64_insn_patch_text_sync(addrs, insns, cnt); |
| 266 | } |
| 267 | |
| 268 | u32 __kprobes aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type, |
| 269 | u32 insn, u64 imm) |
| 270 | { |
| 271 | u32 immlo, immhi, lomask, himask, mask; |
| 272 | int shift; |
| 273 | |
| 274 | switch (type) { |
| 275 | case AARCH64_INSN_IMM_ADR: |
| 276 | lomask = 0x3; |
| 277 | himask = 0x7ffff; |
| 278 | immlo = imm & lomask; |
| 279 | imm >>= 2; |
| 280 | immhi = imm & himask; |
| 281 | imm = (immlo << 24) | (immhi); |
| 282 | mask = (lomask << 24) | (himask); |
| 283 | shift = 5; |
| 284 | break; |
| 285 | case AARCH64_INSN_IMM_26: |
| 286 | mask = BIT(26) - 1; |
| 287 | shift = 0; |
| 288 | break; |
| 289 | case AARCH64_INSN_IMM_19: |
| 290 | mask = BIT(19) - 1; |
| 291 | shift = 5; |
| 292 | break; |
| 293 | case AARCH64_INSN_IMM_16: |
| 294 | mask = BIT(16) - 1; |
| 295 | shift = 5; |
| 296 | break; |
| 297 | case AARCH64_INSN_IMM_14: |
| 298 | mask = BIT(14) - 1; |
| 299 | shift = 5; |
| 300 | break; |
| 301 | case AARCH64_INSN_IMM_12: |
| 302 | mask = BIT(12) - 1; |
| 303 | shift = 10; |
| 304 | break; |
| 305 | case AARCH64_INSN_IMM_9: |
| 306 | mask = BIT(9) - 1; |
| 307 | shift = 12; |
| 308 | break; |
| 309 | case AARCH64_INSN_IMM_7: |
| 310 | mask = BIT(7) - 1; |
| 311 | shift = 15; |
| 312 | break; |
| 313 | case AARCH64_INSN_IMM_6: |
| 314 | case AARCH64_INSN_IMM_S: |
| 315 | mask = BIT(6) - 1; |
| 316 | shift = 10; |
| 317 | break; |
| 318 | case AARCH64_INSN_IMM_R: |
| 319 | mask = BIT(6) - 1; |
| 320 | shift = 16; |
| 321 | break; |
| 322 | default: |
| 323 | pr_err("aarch64_insn_encode_immediate: unknown immediate encoding %d\n", |
| 324 | type); |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | /* Update the immediate field. */ |
| 329 | insn &= ~(mask << shift); |
| 330 | insn |= (imm & mask) << shift; |
| 331 | |
| 332 | return insn; |
| 333 | } |
| 334 | |
| 335 | static u32 aarch64_insn_encode_register(enum aarch64_insn_register_type type, |
| 336 | u32 insn, |
| 337 | enum aarch64_insn_register reg) |
| 338 | { |
| 339 | int shift; |
| 340 | |
| 341 | if (reg < AARCH64_INSN_REG_0 || reg > AARCH64_INSN_REG_SP) { |
| 342 | pr_err("%s: unknown register encoding %d\n", __func__, reg); |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | switch (type) { |
| 347 | case AARCH64_INSN_REGTYPE_RT: |
| 348 | case AARCH64_INSN_REGTYPE_RD: |
| 349 | shift = 0; |
| 350 | break; |
| 351 | case AARCH64_INSN_REGTYPE_RN: |
| 352 | shift = 5; |
| 353 | break; |
| 354 | case AARCH64_INSN_REGTYPE_RT2: |
| 355 | case AARCH64_INSN_REGTYPE_RA: |
| 356 | shift = 10; |
| 357 | break; |
| 358 | case AARCH64_INSN_REGTYPE_RM: |
| 359 | shift = 16; |
| 360 | break; |
| 361 | default: |
| 362 | pr_err("%s: unknown register type encoding %d\n", __func__, |
| 363 | type); |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | insn &= ~(GENMASK(4, 0) << shift); |
| 368 | insn |= reg << shift; |
| 369 | |
| 370 | return insn; |
| 371 | } |
| 372 | |
| 373 | static u32 aarch64_insn_encode_ldst_size(enum aarch64_insn_size_type type, |
| 374 | u32 insn) |
| 375 | { |
| 376 | u32 size; |
| 377 | |
| 378 | switch (type) { |
| 379 | case AARCH64_INSN_SIZE_8: |
| 380 | size = 0; |
| 381 | break; |
| 382 | case AARCH64_INSN_SIZE_16: |
| 383 | size = 1; |
| 384 | break; |
| 385 | case AARCH64_INSN_SIZE_32: |
| 386 | size = 2; |
| 387 | break; |
| 388 | case AARCH64_INSN_SIZE_64: |
| 389 | size = 3; |
| 390 | break; |
| 391 | default: |
| 392 | pr_err("%s: unknown size encoding %d\n", __func__, type); |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | insn &= ~GENMASK(31, 30); |
| 397 | insn |= size << 30; |
| 398 | |
| 399 | return insn; |
| 400 | } |
| 401 | |
| 402 | static inline long branch_imm_common(unsigned long pc, unsigned long addr, |
| 403 | long range) |
| 404 | { |
| 405 | long offset; |
| 406 | |
| 407 | /* |
| 408 | * PC: A 64-bit Program Counter holding the address of the current |
| 409 | * instruction. A64 instructions must be word-aligned. |
| 410 | */ |
| 411 | BUG_ON((pc & 0x3) || (addr & 0x3)); |
| 412 | |
| 413 | offset = ((long)addr - (long)pc); |
| 414 | BUG_ON(offset < -range || offset >= range); |
| 415 | |
| 416 | return offset; |
| 417 | } |
| 418 | |
| 419 | u32 __kprobes aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr, |
| 420 | enum aarch64_insn_branch_type type) |
| 421 | { |
| 422 | u32 insn; |
| 423 | long offset; |
| 424 | |
| 425 | /* |
| 426 | * B/BL support [-128M, 128M) offset |
| 427 | * ARM64 virtual address arrangement guarantees all kernel and module |
| 428 | * texts are within +/-128M. |
| 429 | */ |
| 430 | offset = branch_imm_common(pc, addr, SZ_128M); |
| 431 | |
| 432 | switch (type) { |
| 433 | case AARCH64_INSN_BRANCH_LINK: |
| 434 | insn = aarch64_insn_get_bl_value(); |
| 435 | break; |
| 436 | case AARCH64_INSN_BRANCH_NOLINK: |
| 437 | insn = aarch64_insn_get_b_value(); |
| 438 | break; |
| 439 | default: |
| 440 | BUG_ON(1); |
| 441 | return AARCH64_BREAK_FAULT; |
| 442 | } |
| 443 | |
| 444 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_26, insn, |
| 445 | offset >> 2); |
| 446 | } |
| 447 | |
| 448 | u32 aarch64_insn_gen_comp_branch_imm(unsigned long pc, unsigned long addr, |
| 449 | enum aarch64_insn_register reg, |
| 450 | enum aarch64_insn_variant variant, |
| 451 | enum aarch64_insn_branch_type type) |
| 452 | { |
| 453 | u32 insn; |
| 454 | long offset; |
| 455 | |
| 456 | offset = branch_imm_common(pc, addr, SZ_1M); |
| 457 | |
| 458 | switch (type) { |
| 459 | case AARCH64_INSN_BRANCH_COMP_ZERO: |
| 460 | insn = aarch64_insn_get_cbz_value(); |
| 461 | break; |
| 462 | case AARCH64_INSN_BRANCH_COMP_NONZERO: |
| 463 | insn = aarch64_insn_get_cbnz_value(); |
| 464 | break; |
| 465 | default: |
| 466 | BUG_ON(1); |
| 467 | return AARCH64_BREAK_FAULT; |
| 468 | } |
| 469 | |
| 470 | switch (variant) { |
| 471 | case AARCH64_INSN_VARIANT_32BIT: |
| 472 | break; |
| 473 | case AARCH64_INSN_VARIANT_64BIT: |
| 474 | insn |= AARCH64_INSN_SF_BIT; |
| 475 | break; |
| 476 | default: |
| 477 | BUG_ON(1); |
| 478 | return AARCH64_BREAK_FAULT; |
| 479 | } |
| 480 | |
| 481 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg); |
| 482 | |
| 483 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn, |
| 484 | offset >> 2); |
| 485 | } |
| 486 | |
| 487 | u32 aarch64_insn_gen_cond_branch_imm(unsigned long pc, unsigned long addr, |
| 488 | enum aarch64_insn_condition cond) |
| 489 | { |
| 490 | u32 insn; |
| 491 | long offset; |
| 492 | |
| 493 | offset = branch_imm_common(pc, addr, SZ_1M); |
| 494 | |
| 495 | insn = aarch64_insn_get_bcond_value(); |
| 496 | |
| 497 | BUG_ON(cond < AARCH64_INSN_COND_EQ || cond > AARCH64_INSN_COND_AL); |
| 498 | insn |= cond; |
| 499 | |
| 500 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn, |
| 501 | offset >> 2); |
| 502 | } |
| 503 | |
| 504 | u32 __kprobes aarch64_insn_gen_hint(enum aarch64_insn_hint_op op) |
| 505 | { |
| 506 | return aarch64_insn_get_hint_value() | op; |
| 507 | } |
| 508 | |
| 509 | u32 __kprobes aarch64_insn_gen_nop(void) |
| 510 | { |
| 511 | return aarch64_insn_gen_hint(AARCH64_INSN_HINT_NOP); |
| 512 | } |
| 513 | |
| 514 | u32 aarch64_insn_gen_branch_reg(enum aarch64_insn_register reg, |
| 515 | enum aarch64_insn_branch_type type) |
| 516 | { |
| 517 | u32 insn; |
| 518 | |
| 519 | switch (type) { |
| 520 | case AARCH64_INSN_BRANCH_NOLINK: |
| 521 | insn = aarch64_insn_get_br_value(); |
| 522 | break; |
| 523 | case AARCH64_INSN_BRANCH_LINK: |
| 524 | insn = aarch64_insn_get_blr_value(); |
| 525 | break; |
| 526 | case AARCH64_INSN_BRANCH_RETURN: |
| 527 | insn = aarch64_insn_get_ret_value(); |
| 528 | break; |
| 529 | default: |
| 530 | BUG_ON(1); |
| 531 | return AARCH64_BREAK_FAULT; |
| 532 | } |
| 533 | |
| 534 | return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, reg); |
| 535 | } |
| 536 | |
| 537 | u32 aarch64_insn_gen_load_store_reg(enum aarch64_insn_register reg, |
| 538 | enum aarch64_insn_register base, |
| 539 | enum aarch64_insn_register offset, |
| 540 | enum aarch64_insn_size_type size, |
| 541 | enum aarch64_insn_ldst_type type) |
| 542 | { |
| 543 | u32 insn; |
| 544 | |
| 545 | switch (type) { |
| 546 | case AARCH64_INSN_LDST_LOAD_REG_OFFSET: |
| 547 | insn = aarch64_insn_get_ldr_reg_value(); |
| 548 | break; |
| 549 | case AARCH64_INSN_LDST_STORE_REG_OFFSET: |
| 550 | insn = aarch64_insn_get_str_reg_value(); |
| 551 | break; |
| 552 | default: |
| 553 | BUG_ON(1); |
| 554 | return AARCH64_BREAK_FAULT; |
| 555 | } |
| 556 | |
| 557 | insn = aarch64_insn_encode_ldst_size(size, insn); |
| 558 | |
| 559 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg); |
| 560 | |
| 561 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, |
| 562 | base); |
| 563 | |
| 564 | return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, |
| 565 | offset); |
| 566 | } |
| 567 | |
| 568 | u32 aarch64_insn_gen_load_store_pair(enum aarch64_insn_register reg1, |
| 569 | enum aarch64_insn_register reg2, |
| 570 | enum aarch64_insn_register base, |
| 571 | int offset, |
| 572 | enum aarch64_insn_variant variant, |
| 573 | enum aarch64_insn_ldst_type type) |
| 574 | { |
| 575 | u32 insn; |
| 576 | int shift; |
| 577 | |
| 578 | switch (type) { |
| 579 | case AARCH64_INSN_LDST_LOAD_PAIR_PRE_INDEX: |
| 580 | insn = aarch64_insn_get_ldp_pre_value(); |
| 581 | break; |
| 582 | case AARCH64_INSN_LDST_STORE_PAIR_PRE_INDEX: |
| 583 | insn = aarch64_insn_get_stp_pre_value(); |
| 584 | break; |
| 585 | case AARCH64_INSN_LDST_LOAD_PAIR_POST_INDEX: |
| 586 | insn = aarch64_insn_get_ldp_post_value(); |
| 587 | break; |
| 588 | case AARCH64_INSN_LDST_STORE_PAIR_POST_INDEX: |
| 589 | insn = aarch64_insn_get_stp_post_value(); |
| 590 | break; |
| 591 | default: |
| 592 | BUG_ON(1); |
| 593 | return AARCH64_BREAK_FAULT; |
| 594 | } |
| 595 | |
| 596 | switch (variant) { |
| 597 | case AARCH64_INSN_VARIANT_32BIT: |
| 598 | /* offset must be multiples of 4 in the range [-256, 252] */ |
| 599 | BUG_ON(offset & 0x3); |
| 600 | BUG_ON(offset < -256 || offset > 252); |
| 601 | shift = 2; |
| 602 | break; |
| 603 | case AARCH64_INSN_VARIANT_64BIT: |
| 604 | /* offset must be multiples of 8 in the range [-512, 504] */ |
| 605 | BUG_ON(offset & 0x7); |
| 606 | BUG_ON(offset < -512 || offset > 504); |
| 607 | shift = 3; |
| 608 | insn |= AARCH64_INSN_SF_BIT; |
| 609 | break; |
| 610 | default: |
| 611 | BUG_ON(1); |
| 612 | return AARCH64_BREAK_FAULT; |
| 613 | } |
| 614 | |
| 615 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, |
| 616 | reg1); |
| 617 | |
| 618 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT2, insn, |
| 619 | reg2); |
| 620 | |
| 621 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, |
| 622 | base); |
| 623 | |
| 624 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_7, insn, |
| 625 | offset >> shift); |
| 626 | } |
| 627 | |
| 628 | u32 aarch64_insn_gen_add_sub_imm(enum aarch64_insn_register dst, |
| 629 | enum aarch64_insn_register src, |
| 630 | int imm, enum aarch64_insn_variant variant, |
| 631 | enum aarch64_insn_adsb_type type) |
| 632 | { |
| 633 | u32 insn; |
| 634 | |
| 635 | switch (type) { |
| 636 | case AARCH64_INSN_ADSB_ADD: |
| 637 | insn = aarch64_insn_get_add_imm_value(); |
| 638 | break; |
| 639 | case AARCH64_INSN_ADSB_SUB: |
| 640 | insn = aarch64_insn_get_sub_imm_value(); |
| 641 | break; |
| 642 | case AARCH64_INSN_ADSB_ADD_SETFLAGS: |
| 643 | insn = aarch64_insn_get_adds_imm_value(); |
| 644 | break; |
| 645 | case AARCH64_INSN_ADSB_SUB_SETFLAGS: |
| 646 | insn = aarch64_insn_get_subs_imm_value(); |
| 647 | break; |
| 648 | default: |
| 649 | BUG_ON(1); |
| 650 | return AARCH64_BREAK_FAULT; |
| 651 | } |
| 652 | |
| 653 | switch (variant) { |
| 654 | case AARCH64_INSN_VARIANT_32BIT: |
| 655 | break; |
| 656 | case AARCH64_INSN_VARIANT_64BIT: |
| 657 | insn |= AARCH64_INSN_SF_BIT; |
| 658 | break; |
| 659 | default: |
| 660 | BUG_ON(1); |
| 661 | return AARCH64_BREAK_FAULT; |
| 662 | } |
| 663 | |
| 664 | BUG_ON(imm & ~(SZ_4K - 1)); |
| 665 | |
| 666 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 667 | |
| 668 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); |
| 669 | |
| 670 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_12, insn, imm); |
| 671 | } |
| 672 | |
| 673 | u32 aarch64_insn_gen_bitfield(enum aarch64_insn_register dst, |
| 674 | enum aarch64_insn_register src, |
| 675 | int immr, int imms, |
| 676 | enum aarch64_insn_variant variant, |
| 677 | enum aarch64_insn_bitfield_type type) |
| 678 | { |
| 679 | u32 insn; |
| 680 | u32 mask; |
| 681 | |
| 682 | switch (type) { |
| 683 | case AARCH64_INSN_BITFIELD_MOVE: |
| 684 | insn = aarch64_insn_get_bfm_value(); |
| 685 | break; |
| 686 | case AARCH64_INSN_BITFIELD_MOVE_UNSIGNED: |
| 687 | insn = aarch64_insn_get_ubfm_value(); |
| 688 | break; |
| 689 | case AARCH64_INSN_BITFIELD_MOVE_SIGNED: |
| 690 | insn = aarch64_insn_get_sbfm_value(); |
| 691 | break; |
| 692 | default: |
| 693 | BUG_ON(1); |
| 694 | return AARCH64_BREAK_FAULT; |
| 695 | } |
| 696 | |
| 697 | switch (variant) { |
| 698 | case AARCH64_INSN_VARIANT_32BIT: |
| 699 | mask = GENMASK(4, 0); |
| 700 | break; |
| 701 | case AARCH64_INSN_VARIANT_64BIT: |
| 702 | insn |= AARCH64_INSN_SF_BIT | AARCH64_INSN_N_BIT; |
| 703 | mask = GENMASK(5, 0); |
| 704 | break; |
| 705 | default: |
| 706 | BUG_ON(1); |
| 707 | return AARCH64_BREAK_FAULT; |
| 708 | } |
| 709 | |
| 710 | BUG_ON(immr & ~mask); |
| 711 | BUG_ON(imms & ~mask); |
| 712 | |
| 713 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 714 | |
| 715 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); |
| 716 | |
| 717 | insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_R, insn, immr); |
| 718 | |
| 719 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_S, insn, imms); |
| 720 | } |
| 721 | |
| 722 | u32 aarch64_insn_gen_movewide(enum aarch64_insn_register dst, |
| 723 | int imm, int shift, |
| 724 | enum aarch64_insn_variant variant, |
| 725 | enum aarch64_insn_movewide_type type) |
| 726 | { |
| 727 | u32 insn; |
| 728 | |
| 729 | switch (type) { |
| 730 | case AARCH64_INSN_MOVEWIDE_ZERO: |
| 731 | insn = aarch64_insn_get_movz_value(); |
| 732 | break; |
| 733 | case AARCH64_INSN_MOVEWIDE_KEEP: |
| 734 | insn = aarch64_insn_get_movk_value(); |
| 735 | break; |
| 736 | case AARCH64_INSN_MOVEWIDE_INVERSE: |
| 737 | insn = aarch64_insn_get_movn_value(); |
| 738 | break; |
| 739 | default: |
| 740 | BUG_ON(1); |
| 741 | return AARCH64_BREAK_FAULT; |
| 742 | } |
| 743 | |
| 744 | BUG_ON(imm & ~(SZ_64K - 1)); |
| 745 | |
| 746 | switch (variant) { |
| 747 | case AARCH64_INSN_VARIANT_32BIT: |
| 748 | BUG_ON(shift != 0 && shift != 16); |
| 749 | break; |
| 750 | case AARCH64_INSN_VARIANT_64BIT: |
| 751 | insn |= AARCH64_INSN_SF_BIT; |
| 752 | BUG_ON(shift != 0 && shift != 16 && shift != 32 && |
| 753 | shift != 48); |
| 754 | break; |
| 755 | default: |
| 756 | BUG_ON(1); |
| 757 | return AARCH64_BREAK_FAULT; |
| 758 | } |
| 759 | |
| 760 | insn |= (shift >> 4) << 21; |
| 761 | |
| 762 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 763 | |
| 764 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_16, insn, imm); |
| 765 | } |
| 766 | |
| 767 | u32 aarch64_insn_gen_add_sub_shifted_reg(enum aarch64_insn_register dst, |
| 768 | enum aarch64_insn_register src, |
| 769 | enum aarch64_insn_register reg, |
| 770 | int shift, |
| 771 | enum aarch64_insn_variant variant, |
| 772 | enum aarch64_insn_adsb_type type) |
| 773 | { |
| 774 | u32 insn; |
| 775 | |
| 776 | switch (type) { |
| 777 | case AARCH64_INSN_ADSB_ADD: |
| 778 | insn = aarch64_insn_get_add_value(); |
| 779 | break; |
| 780 | case AARCH64_INSN_ADSB_SUB: |
| 781 | insn = aarch64_insn_get_sub_value(); |
| 782 | break; |
| 783 | case AARCH64_INSN_ADSB_ADD_SETFLAGS: |
| 784 | insn = aarch64_insn_get_adds_value(); |
| 785 | break; |
| 786 | case AARCH64_INSN_ADSB_SUB_SETFLAGS: |
| 787 | insn = aarch64_insn_get_subs_value(); |
| 788 | break; |
| 789 | default: |
| 790 | BUG_ON(1); |
| 791 | return AARCH64_BREAK_FAULT; |
| 792 | } |
| 793 | |
| 794 | switch (variant) { |
| 795 | case AARCH64_INSN_VARIANT_32BIT: |
| 796 | BUG_ON(shift & ~(SZ_32 - 1)); |
| 797 | break; |
| 798 | case AARCH64_INSN_VARIANT_64BIT: |
| 799 | insn |= AARCH64_INSN_SF_BIT; |
| 800 | BUG_ON(shift & ~(SZ_64 - 1)); |
| 801 | break; |
| 802 | default: |
| 803 | BUG_ON(1); |
| 804 | return AARCH64_BREAK_FAULT; |
| 805 | } |
| 806 | |
| 807 | |
| 808 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 809 | |
| 810 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); |
| 811 | |
| 812 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg); |
| 813 | |
| 814 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_6, insn, shift); |
| 815 | } |
| 816 | |
| 817 | u32 aarch64_insn_gen_data1(enum aarch64_insn_register dst, |
| 818 | enum aarch64_insn_register src, |
| 819 | enum aarch64_insn_variant variant, |
| 820 | enum aarch64_insn_data1_type type) |
| 821 | { |
| 822 | u32 insn; |
| 823 | |
| 824 | switch (type) { |
| 825 | case AARCH64_INSN_DATA1_REVERSE_16: |
| 826 | insn = aarch64_insn_get_rev16_value(); |
| 827 | break; |
| 828 | case AARCH64_INSN_DATA1_REVERSE_32: |
| 829 | insn = aarch64_insn_get_rev32_value(); |
| 830 | break; |
| 831 | case AARCH64_INSN_DATA1_REVERSE_64: |
| 832 | BUG_ON(variant != AARCH64_INSN_VARIANT_64BIT); |
| 833 | insn = aarch64_insn_get_rev64_value(); |
| 834 | break; |
| 835 | default: |
| 836 | BUG_ON(1); |
| 837 | return AARCH64_BREAK_FAULT; |
| 838 | } |
| 839 | |
| 840 | switch (variant) { |
| 841 | case AARCH64_INSN_VARIANT_32BIT: |
| 842 | break; |
| 843 | case AARCH64_INSN_VARIANT_64BIT: |
| 844 | insn |= AARCH64_INSN_SF_BIT; |
| 845 | break; |
| 846 | default: |
| 847 | BUG_ON(1); |
| 848 | return AARCH64_BREAK_FAULT; |
| 849 | } |
| 850 | |
| 851 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 852 | |
| 853 | return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); |
| 854 | } |
| 855 | |
| 856 | u32 aarch64_insn_gen_data2(enum aarch64_insn_register dst, |
| 857 | enum aarch64_insn_register src, |
| 858 | enum aarch64_insn_register reg, |
| 859 | enum aarch64_insn_variant variant, |
| 860 | enum aarch64_insn_data2_type type) |
| 861 | { |
| 862 | u32 insn; |
| 863 | |
| 864 | switch (type) { |
| 865 | case AARCH64_INSN_DATA2_UDIV: |
| 866 | insn = aarch64_insn_get_udiv_value(); |
| 867 | break; |
| 868 | case AARCH64_INSN_DATA2_SDIV: |
| 869 | insn = aarch64_insn_get_sdiv_value(); |
| 870 | break; |
| 871 | case AARCH64_INSN_DATA2_LSLV: |
| 872 | insn = aarch64_insn_get_lslv_value(); |
| 873 | break; |
| 874 | case AARCH64_INSN_DATA2_LSRV: |
| 875 | insn = aarch64_insn_get_lsrv_value(); |
| 876 | break; |
| 877 | case AARCH64_INSN_DATA2_ASRV: |
| 878 | insn = aarch64_insn_get_asrv_value(); |
| 879 | break; |
| 880 | case AARCH64_INSN_DATA2_RORV: |
| 881 | insn = aarch64_insn_get_rorv_value(); |
| 882 | break; |
| 883 | default: |
| 884 | BUG_ON(1); |
| 885 | return AARCH64_BREAK_FAULT; |
| 886 | } |
| 887 | |
| 888 | switch (variant) { |
| 889 | case AARCH64_INSN_VARIANT_32BIT: |
| 890 | break; |
| 891 | case AARCH64_INSN_VARIANT_64BIT: |
| 892 | insn |= AARCH64_INSN_SF_BIT; |
| 893 | break; |
| 894 | default: |
| 895 | BUG_ON(1); |
| 896 | return AARCH64_BREAK_FAULT; |
| 897 | } |
| 898 | |
| 899 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 900 | |
| 901 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); |
| 902 | |
| 903 | return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg); |
| 904 | } |
| 905 | |
| 906 | u32 aarch64_insn_gen_data3(enum aarch64_insn_register dst, |
| 907 | enum aarch64_insn_register src, |
| 908 | enum aarch64_insn_register reg1, |
| 909 | enum aarch64_insn_register reg2, |
| 910 | enum aarch64_insn_variant variant, |
| 911 | enum aarch64_insn_data3_type type) |
| 912 | { |
| 913 | u32 insn; |
| 914 | |
| 915 | switch (type) { |
| 916 | case AARCH64_INSN_DATA3_MADD: |
| 917 | insn = aarch64_insn_get_madd_value(); |
| 918 | break; |
| 919 | case AARCH64_INSN_DATA3_MSUB: |
| 920 | insn = aarch64_insn_get_msub_value(); |
| 921 | break; |
| 922 | default: |
| 923 | BUG_ON(1); |
| 924 | return AARCH64_BREAK_FAULT; |
| 925 | } |
| 926 | |
| 927 | switch (variant) { |
| 928 | case AARCH64_INSN_VARIANT_32BIT: |
| 929 | break; |
| 930 | case AARCH64_INSN_VARIANT_64BIT: |
| 931 | insn |= AARCH64_INSN_SF_BIT; |
| 932 | break; |
| 933 | default: |
| 934 | BUG_ON(1); |
| 935 | return AARCH64_BREAK_FAULT; |
| 936 | } |
| 937 | |
| 938 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 939 | |
| 940 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RA, insn, src); |
| 941 | |
| 942 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, |
| 943 | reg1); |
| 944 | |
| 945 | return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, |
| 946 | reg2); |
| 947 | } |
| 948 | |
| 949 | u32 aarch64_insn_gen_logical_shifted_reg(enum aarch64_insn_register dst, |
| 950 | enum aarch64_insn_register src, |
| 951 | enum aarch64_insn_register reg, |
| 952 | int shift, |
| 953 | enum aarch64_insn_variant variant, |
| 954 | enum aarch64_insn_logic_type type) |
| 955 | { |
| 956 | u32 insn; |
| 957 | |
| 958 | switch (type) { |
| 959 | case AARCH64_INSN_LOGIC_AND: |
| 960 | insn = aarch64_insn_get_and_value(); |
| 961 | break; |
| 962 | case AARCH64_INSN_LOGIC_BIC: |
| 963 | insn = aarch64_insn_get_bic_value(); |
| 964 | break; |
| 965 | case AARCH64_INSN_LOGIC_ORR: |
| 966 | insn = aarch64_insn_get_orr_value(); |
| 967 | break; |
| 968 | case AARCH64_INSN_LOGIC_ORN: |
| 969 | insn = aarch64_insn_get_orn_value(); |
| 970 | break; |
| 971 | case AARCH64_INSN_LOGIC_EOR: |
| 972 | insn = aarch64_insn_get_eor_value(); |
| 973 | break; |
| 974 | case AARCH64_INSN_LOGIC_EON: |
| 975 | insn = aarch64_insn_get_eon_value(); |
| 976 | break; |
| 977 | case AARCH64_INSN_LOGIC_AND_SETFLAGS: |
| 978 | insn = aarch64_insn_get_ands_value(); |
| 979 | break; |
| 980 | case AARCH64_INSN_LOGIC_BIC_SETFLAGS: |
| 981 | insn = aarch64_insn_get_bics_value(); |
| 982 | break; |
| 983 | default: |
| 984 | BUG_ON(1); |
| 985 | return AARCH64_BREAK_FAULT; |
| 986 | } |
| 987 | |
| 988 | switch (variant) { |
| 989 | case AARCH64_INSN_VARIANT_32BIT: |
| 990 | BUG_ON(shift & ~(SZ_32 - 1)); |
| 991 | break; |
| 992 | case AARCH64_INSN_VARIANT_64BIT: |
| 993 | insn |= AARCH64_INSN_SF_BIT; |
| 994 | BUG_ON(shift & ~(SZ_64 - 1)); |
| 995 | break; |
| 996 | default: |
| 997 | BUG_ON(1); |
| 998 | return AARCH64_BREAK_FAULT; |
| 999 | } |
| 1000 | |
| 1001 | |
| 1002 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RD, insn, dst); |
| 1003 | |
| 1004 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, src); |
| 1005 | |
| 1006 | insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RM, insn, reg); |
| 1007 | |
| 1008 | return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_6, insn, shift); |
| 1009 | } |
| 1010 | |
| 1011 | bool aarch32_insn_is_wide(u32 insn) |
| 1012 | { |
| 1013 | return insn >= 0xe800; |
| 1014 | } |
| 1015 | |
| 1016 | /* |
| 1017 | * Macros/defines for extracting register numbers from instruction. |
| 1018 | */ |
| 1019 | u32 aarch32_insn_extract_reg_num(u32 insn, int offset) |
| 1020 | { |
| 1021 | return (insn & (0xf << offset)) >> offset; |
| 1022 | } |
| 1023 | |
| 1024 | #define OPC2_MASK 0x7 |
| 1025 | #define OPC2_OFFSET 5 |
| 1026 | u32 aarch32_insn_mcr_extract_opc2(u32 insn) |
| 1027 | { |
| 1028 | return (insn & (OPC2_MASK << OPC2_OFFSET)) >> OPC2_OFFSET; |
| 1029 | } |
| 1030 | |
| 1031 | #define CRM_MASK 0xf |
| 1032 | u32 aarch32_insn_mcr_extract_crm(u32 insn) |
| 1033 | { |
| 1034 | return insn & CRM_MASK; |
| 1035 | } |