| 1 | /* GNU/Linux/AArch64 specific low level interface, for the remote server for |
| 2 | GDB. |
| 3 | |
| 4 | Copyright (C) 2009-2015 Free Software Foundation, Inc. |
| 5 | Contributed by ARM Ltd. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "server.h" |
| 23 | #include "linux-low.h" |
| 24 | #include "nat/aarch64-linux.h" |
| 25 | #include "nat/aarch64-linux-hw-point.h" |
| 26 | #include "arch/aarch64-insn.h" |
| 27 | #include "linux-aarch32-low.h" |
| 28 | #include "elf/common.h" |
| 29 | #include "ax.h" |
| 30 | #include "tracepoint.h" |
| 31 | |
| 32 | #include <signal.h> |
| 33 | #include <sys/user.h> |
| 34 | #include "nat/gdb_ptrace.h" |
| 35 | #include <asm/ptrace.h> |
| 36 | #include <inttypes.h> |
| 37 | #include <endian.h> |
| 38 | #include <sys/uio.h> |
| 39 | |
| 40 | #include "gdb_proc_service.h" |
| 41 | |
| 42 | /* Defined in auto-generated files. */ |
| 43 | void init_registers_aarch64 (void); |
| 44 | extern const struct target_desc *tdesc_aarch64; |
| 45 | |
| 46 | #ifdef HAVE_SYS_REG_H |
| 47 | #include <sys/reg.h> |
| 48 | #endif |
| 49 | |
| 50 | #define AARCH64_X_REGS_NUM 31 |
| 51 | #define AARCH64_V_REGS_NUM 32 |
| 52 | #define AARCH64_X0_REGNO 0 |
| 53 | #define AARCH64_SP_REGNO 31 |
| 54 | #define AARCH64_PC_REGNO 32 |
| 55 | #define AARCH64_CPSR_REGNO 33 |
| 56 | #define AARCH64_V0_REGNO 34 |
| 57 | #define AARCH64_FPSR_REGNO (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM) |
| 58 | #define AARCH64_FPCR_REGNO (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM + 1) |
| 59 | |
| 60 | #define AARCH64_NUM_REGS (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM + 2) |
| 61 | |
| 62 | /* Per-process arch-specific data we want to keep. */ |
| 63 | |
| 64 | struct arch_process_info |
| 65 | { |
| 66 | /* Hardware breakpoint/watchpoint data. |
| 67 | The reason for them to be per-process rather than per-thread is |
| 68 | due to the lack of information in the gdbserver environment; |
| 69 | gdbserver is not told that whether a requested hardware |
| 70 | breakpoint/watchpoint is thread specific or not, so it has to set |
| 71 | each hw bp/wp for every thread in the current process. The |
| 72 | higher level bp/wp management in gdb will resume a thread if a hw |
| 73 | bp/wp trap is not expected for it. Since the hw bp/wp setting is |
| 74 | same for each thread, it is reasonable for the data to live here. |
| 75 | */ |
| 76 | struct aarch64_debug_reg_state debug_reg_state; |
| 77 | }; |
| 78 | |
| 79 | /* Return true if the size of register 0 is 8 byte. */ |
| 80 | |
| 81 | static int |
| 82 | is_64bit_tdesc (void) |
| 83 | { |
| 84 | struct regcache *regcache = get_thread_regcache (current_thread, 0); |
| 85 | |
| 86 | return register_size (regcache->tdesc, 0) == 8; |
| 87 | } |
| 88 | |
| 89 | /* Implementation of linux_target_ops method "cannot_store_register". */ |
| 90 | |
| 91 | static int |
| 92 | aarch64_cannot_store_register (int regno) |
| 93 | { |
| 94 | return regno >= AARCH64_NUM_REGS; |
| 95 | } |
| 96 | |
| 97 | /* Implementation of linux_target_ops method "cannot_fetch_register". */ |
| 98 | |
| 99 | static int |
| 100 | aarch64_cannot_fetch_register (int regno) |
| 101 | { |
| 102 | return regno >= AARCH64_NUM_REGS; |
| 103 | } |
| 104 | |
| 105 | static void |
| 106 | aarch64_fill_gregset (struct regcache *regcache, void *buf) |
| 107 | { |
| 108 | struct user_pt_regs *regset = buf; |
| 109 | int i; |
| 110 | |
| 111 | for (i = 0; i < AARCH64_X_REGS_NUM; i++) |
| 112 | collect_register (regcache, AARCH64_X0_REGNO + i, ®set->regs[i]); |
| 113 | collect_register (regcache, AARCH64_SP_REGNO, ®set->sp); |
| 114 | collect_register (regcache, AARCH64_PC_REGNO, ®set->pc); |
| 115 | collect_register (regcache, AARCH64_CPSR_REGNO, ®set->pstate); |
| 116 | } |
| 117 | |
| 118 | static void |
| 119 | aarch64_store_gregset (struct regcache *regcache, const void *buf) |
| 120 | { |
| 121 | const struct user_pt_regs *regset = buf; |
| 122 | int i; |
| 123 | |
| 124 | for (i = 0; i < AARCH64_X_REGS_NUM; i++) |
| 125 | supply_register (regcache, AARCH64_X0_REGNO + i, ®set->regs[i]); |
| 126 | supply_register (regcache, AARCH64_SP_REGNO, ®set->sp); |
| 127 | supply_register (regcache, AARCH64_PC_REGNO, ®set->pc); |
| 128 | supply_register (regcache, AARCH64_CPSR_REGNO, ®set->pstate); |
| 129 | } |
| 130 | |
| 131 | static void |
| 132 | aarch64_fill_fpregset (struct regcache *regcache, void *buf) |
| 133 | { |
| 134 | struct user_fpsimd_state *regset = buf; |
| 135 | int i; |
| 136 | |
| 137 | for (i = 0; i < AARCH64_V_REGS_NUM; i++) |
| 138 | collect_register (regcache, AARCH64_V0_REGNO + i, ®set->vregs[i]); |
| 139 | collect_register (regcache, AARCH64_FPSR_REGNO, ®set->fpsr); |
| 140 | collect_register (regcache, AARCH64_FPCR_REGNO, ®set->fpcr); |
| 141 | } |
| 142 | |
| 143 | static void |
| 144 | aarch64_store_fpregset (struct regcache *regcache, const void *buf) |
| 145 | { |
| 146 | const struct user_fpsimd_state *regset = buf; |
| 147 | int i; |
| 148 | |
| 149 | for (i = 0; i < AARCH64_V_REGS_NUM; i++) |
| 150 | supply_register (regcache, AARCH64_V0_REGNO + i, ®set->vregs[i]); |
| 151 | supply_register (regcache, AARCH64_FPSR_REGNO, ®set->fpsr); |
| 152 | supply_register (regcache, AARCH64_FPCR_REGNO, ®set->fpcr); |
| 153 | } |
| 154 | |
| 155 | /* Enable miscellaneous debugging output. The name is historical - it |
| 156 | was originally used to debug LinuxThreads support. */ |
| 157 | extern int debug_threads; |
| 158 | |
| 159 | /* Implementation of linux_target_ops method "get_pc". */ |
| 160 | |
| 161 | static CORE_ADDR |
| 162 | aarch64_get_pc (struct regcache *regcache) |
| 163 | { |
| 164 | if (register_size (regcache->tdesc, 0) == 8) |
| 165 | { |
| 166 | unsigned long pc; |
| 167 | |
| 168 | collect_register_by_name (regcache, "pc", &pc); |
| 169 | if (debug_threads) |
| 170 | debug_printf ("stop pc is %08lx\n", pc); |
| 171 | return pc; |
| 172 | } |
| 173 | else |
| 174 | { |
| 175 | unsigned int pc; |
| 176 | |
| 177 | collect_register_by_name (regcache, "pc", &pc); |
| 178 | if (debug_threads) |
| 179 | debug_printf ("stop pc is %04x\n", pc); |
| 180 | return pc; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /* Implementation of linux_target_ops method "set_pc". */ |
| 185 | |
| 186 | static void |
| 187 | aarch64_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| 188 | { |
| 189 | if (register_size (regcache->tdesc, 0) == 8) |
| 190 | { |
| 191 | unsigned long newpc = pc; |
| 192 | supply_register_by_name (regcache, "pc", &newpc); |
| 193 | } |
| 194 | else |
| 195 | { |
| 196 | unsigned int newpc = pc; |
| 197 | supply_register_by_name (regcache, "pc", &newpc); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | #define aarch64_breakpoint_len 4 |
| 202 | |
| 203 | /* AArch64 BRK software debug mode instruction. |
| 204 | This instruction needs to match gdb/aarch64-tdep.c |
| 205 | (aarch64_default_breakpoint). */ |
| 206 | static const gdb_byte aarch64_breakpoint[] = {0x00, 0x00, 0x20, 0xd4}; |
| 207 | |
| 208 | /* Implementation of linux_target_ops method "breakpoint_at". */ |
| 209 | |
| 210 | static int |
| 211 | aarch64_breakpoint_at (CORE_ADDR where) |
| 212 | { |
| 213 | gdb_byte insn[aarch64_breakpoint_len]; |
| 214 | |
| 215 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
| 216 | aarch64_breakpoint_len); |
| 217 | if (memcmp (insn, aarch64_breakpoint, aarch64_breakpoint_len) == 0) |
| 218 | return 1; |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | static void |
| 224 | aarch64_init_debug_reg_state (struct aarch64_debug_reg_state *state) |
| 225 | { |
| 226 | int i; |
| 227 | |
| 228 | for (i = 0; i < AARCH64_HBP_MAX_NUM; ++i) |
| 229 | { |
| 230 | state->dr_addr_bp[i] = 0; |
| 231 | state->dr_ctrl_bp[i] = 0; |
| 232 | state->dr_ref_count_bp[i] = 0; |
| 233 | } |
| 234 | |
| 235 | for (i = 0; i < AARCH64_HWP_MAX_NUM; ++i) |
| 236 | { |
| 237 | state->dr_addr_wp[i] = 0; |
| 238 | state->dr_ctrl_wp[i] = 0; |
| 239 | state->dr_ref_count_wp[i] = 0; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /* Return the pointer to the debug register state structure in the |
| 244 | current process' arch-specific data area. */ |
| 245 | |
| 246 | struct aarch64_debug_reg_state * |
| 247 | aarch64_get_debug_reg_state (pid_t pid) |
| 248 | { |
| 249 | struct process_info *proc = find_process_pid (pid); |
| 250 | |
| 251 | return &proc->priv->arch_private->debug_reg_state; |
| 252 | } |
| 253 | |
| 254 | /* Implementation of linux_target_ops method "supports_z_point_type". */ |
| 255 | |
| 256 | static int |
| 257 | aarch64_supports_z_point_type (char z_type) |
| 258 | { |
| 259 | switch (z_type) |
| 260 | { |
| 261 | case Z_PACKET_SW_BP: |
| 262 | { |
| 263 | if (!extended_protocol && is_64bit_tdesc ()) |
| 264 | { |
| 265 | /* Only enable Z0 packet in non-multi-arch debugging. If |
| 266 | extended protocol is used, don't enable Z0 packet because |
| 267 | GDBserver may attach to 32-bit process. */ |
| 268 | return 1; |
| 269 | } |
| 270 | else |
| 271 | { |
| 272 | /* Disable Z0 packet so that GDBserver doesn't have to handle |
| 273 | different breakpoint instructions (aarch64, arm, thumb etc) |
| 274 | in multi-arch debugging. */ |
| 275 | return 0; |
| 276 | } |
| 277 | } |
| 278 | case Z_PACKET_HW_BP: |
| 279 | case Z_PACKET_WRITE_WP: |
| 280 | case Z_PACKET_READ_WP: |
| 281 | case Z_PACKET_ACCESS_WP: |
| 282 | return 1; |
| 283 | default: |
| 284 | return 0; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /* Implementation of linux_target_ops method "insert_point". |
| 289 | |
| 290 | It actually only records the info of the to-be-inserted bp/wp; |
| 291 | the actual insertion will happen when threads are resumed. */ |
| 292 | |
| 293 | static int |
| 294 | aarch64_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| 295 | int len, struct raw_breakpoint *bp) |
| 296 | { |
| 297 | int ret; |
| 298 | enum target_hw_bp_type targ_type; |
| 299 | struct aarch64_debug_reg_state *state |
| 300 | = aarch64_get_debug_reg_state (pid_of (current_thread)); |
| 301 | |
| 302 | if (show_debug_regs) |
| 303 | fprintf (stderr, "insert_point on entry (addr=0x%08lx, len=%d)\n", |
| 304 | (unsigned long) addr, len); |
| 305 | |
| 306 | /* Determine the type from the raw breakpoint type. */ |
| 307 | targ_type = raw_bkpt_type_to_target_hw_bp_type (type); |
| 308 | |
| 309 | if (targ_type != hw_execute) |
| 310 | { |
| 311 | if (aarch64_linux_region_ok_for_watchpoint (addr, len)) |
| 312 | ret = aarch64_handle_watchpoint (targ_type, addr, len, |
| 313 | 1 /* is_insert */, state); |
| 314 | else |
| 315 | ret = -1; |
| 316 | } |
| 317 | else |
| 318 | { |
| 319 | if (len == 3) |
| 320 | { |
| 321 | /* LEN is 3 means the breakpoint is set on a 32-bit thumb |
| 322 | instruction. Set it to 2 to correctly encode length bit |
| 323 | mask in hardware/watchpoint control register. */ |
| 324 | len = 2; |
| 325 | } |
| 326 | ret = aarch64_handle_breakpoint (targ_type, addr, len, |
| 327 | 1 /* is_insert */, state); |
| 328 | } |
| 329 | |
| 330 | if (show_debug_regs) |
| 331 | aarch64_show_debug_reg_state (state, "insert_point", addr, len, |
| 332 | targ_type); |
| 333 | |
| 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | /* Implementation of linux_target_ops method "remove_point". |
| 338 | |
| 339 | It actually only records the info of the to-be-removed bp/wp, |
| 340 | the actual removal will be done when threads are resumed. */ |
| 341 | |
| 342 | static int |
| 343 | aarch64_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| 344 | int len, struct raw_breakpoint *bp) |
| 345 | { |
| 346 | int ret; |
| 347 | enum target_hw_bp_type targ_type; |
| 348 | struct aarch64_debug_reg_state *state |
| 349 | = aarch64_get_debug_reg_state (pid_of (current_thread)); |
| 350 | |
| 351 | if (show_debug_regs) |
| 352 | fprintf (stderr, "remove_point on entry (addr=0x%08lx, len=%d)\n", |
| 353 | (unsigned long) addr, len); |
| 354 | |
| 355 | /* Determine the type from the raw breakpoint type. */ |
| 356 | targ_type = raw_bkpt_type_to_target_hw_bp_type (type); |
| 357 | |
| 358 | /* Set up state pointers. */ |
| 359 | if (targ_type != hw_execute) |
| 360 | ret = |
| 361 | aarch64_handle_watchpoint (targ_type, addr, len, 0 /* is_insert */, |
| 362 | state); |
| 363 | else |
| 364 | { |
| 365 | if (len == 3) |
| 366 | { |
| 367 | /* LEN is 3 means the breakpoint is set on a 32-bit thumb |
| 368 | instruction. Set it to 2 to correctly encode length bit |
| 369 | mask in hardware/watchpoint control register. */ |
| 370 | len = 2; |
| 371 | } |
| 372 | ret = aarch64_handle_breakpoint (targ_type, addr, len, |
| 373 | 0 /* is_insert */, state); |
| 374 | } |
| 375 | |
| 376 | if (show_debug_regs) |
| 377 | aarch64_show_debug_reg_state (state, "remove_point", addr, len, |
| 378 | targ_type); |
| 379 | |
| 380 | return ret; |
| 381 | } |
| 382 | |
| 383 | /* Implementation of linux_target_ops method "stopped_data_address". */ |
| 384 | |
| 385 | static CORE_ADDR |
| 386 | aarch64_stopped_data_address (void) |
| 387 | { |
| 388 | siginfo_t siginfo; |
| 389 | int pid, i; |
| 390 | struct aarch64_debug_reg_state *state; |
| 391 | |
| 392 | pid = lwpid_of (current_thread); |
| 393 | |
| 394 | /* Get the siginfo. */ |
| 395 | if (ptrace (PTRACE_GETSIGINFO, pid, NULL, &siginfo) != 0) |
| 396 | return (CORE_ADDR) 0; |
| 397 | |
| 398 | /* Need to be a hardware breakpoint/watchpoint trap. */ |
| 399 | if (siginfo.si_signo != SIGTRAP |
| 400 | || (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */) |
| 401 | return (CORE_ADDR) 0; |
| 402 | |
| 403 | /* Check if the address matches any watched address. */ |
| 404 | state = aarch64_get_debug_reg_state (pid_of (current_thread)); |
| 405 | for (i = aarch64_num_wp_regs - 1; i >= 0; --i) |
| 406 | { |
| 407 | const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]); |
| 408 | const CORE_ADDR addr_trap = (CORE_ADDR) siginfo.si_addr; |
| 409 | const CORE_ADDR addr_watch = state->dr_addr_wp[i]; |
| 410 | if (state->dr_ref_count_wp[i] |
| 411 | && DR_CONTROL_ENABLED (state->dr_ctrl_wp[i]) |
| 412 | && addr_trap >= addr_watch |
| 413 | && addr_trap < addr_watch + len) |
| 414 | return addr_trap; |
| 415 | } |
| 416 | |
| 417 | return (CORE_ADDR) 0; |
| 418 | } |
| 419 | |
| 420 | /* Implementation of linux_target_ops method "stopped_by_watchpoint". */ |
| 421 | |
| 422 | static int |
| 423 | aarch64_stopped_by_watchpoint (void) |
| 424 | { |
| 425 | if (aarch64_stopped_data_address () != 0) |
| 426 | return 1; |
| 427 | else |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 432 | |
| 433 | ps_err_e |
| 434 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 435 | lwpid_t lwpid, int idx, void **base) |
| 436 | { |
| 437 | return aarch64_ps_get_thread_area (ph, lwpid, idx, base, |
| 438 | is_64bit_tdesc ()); |
| 439 | } |
| 440 | |
| 441 | /* Implementation of linux_target_ops method "siginfo_fixup". */ |
| 442 | |
| 443 | static int |
| 444 | aarch64_linux_siginfo_fixup (siginfo_t *native, void *inf, int direction) |
| 445 | { |
| 446 | /* Is the inferior 32-bit? If so, then fixup the siginfo object. */ |
| 447 | if (!is_64bit_tdesc ()) |
| 448 | { |
| 449 | if (direction == 0) |
| 450 | aarch64_compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, |
| 451 | native); |
| 452 | else |
| 453 | aarch64_siginfo_from_compat_siginfo (native, |
| 454 | (struct compat_siginfo *) inf); |
| 455 | |
| 456 | return 1; |
| 457 | } |
| 458 | |
| 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | /* Implementation of linux_target_ops method "linux_new_process". */ |
| 463 | |
| 464 | static struct arch_process_info * |
| 465 | aarch64_linux_new_process (void) |
| 466 | { |
| 467 | struct arch_process_info *info = XCNEW (struct arch_process_info); |
| 468 | |
| 469 | aarch64_init_debug_reg_state (&info->debug_reg_state); |
| 470 | |
| 471 | return info; |
| 472 | } |
| 473 | |
| 474 | /* Implementation of linux_target_ops method "linux_new_fork". */ |
| 475 | |
| 476 | static void |
| 477 | aarch64_linux_new_fork (struct process_info *parent, |
| 478 | struct process_info *child) |
| 479 | { |
| 480 | /* These are allocated by linux_add_process. */ |
| 481 | gdb_assert (parent->priv != NULL |
| 482 | && parent->priv->arch_private != NULL); |
| 483 | gdb_assert (child->priv != NULL |
| 484 | && child->priv->arch_private != NULL); |
| 485 | |
| 486 | /* Linux kernel before 2.6.33 commit |
| 487 | 72f674d203cd230426437cdcf7dd6f681dad8b0d |
| 488 | will inherit hardware debug registers from parent |
| 489 | on fork/vfork/clone. Newer Linux kernels create such tasks with |
| 490 | zeroed debug registers. |
| 491 | |
| 492 | GDB core assumes the child inherits the watchpoints/hw |
| 493 | breakpoints of the parent, and will remove them all from the |
| 494 | forked off process. Copy the debug registers mirrors into the |
| 495 | new process so that all breakpoints and watchpoints can be |
| 496 | removed together. The debug registers mirror will become zeroed |
| 497 | in the end before detaching the forked off process, thus making |
| 498 | this compatible with older Linux kernels too. */ |
| 499 | |
| 500 | *child->priv->arch_private = *parent->priv->arch_private; |
| 501 | } |
| 502 | |
| 503 | /* Return the right target description according to the ELF file of |
| 504 | current thread. */ |
| 505 | |
| 506 | static const struct target_desc * |
| 507 | aarch64_linux_read_description (void) |
| 508 | { |
| 509 | unsigned int machine; |
| 510 | int is_elf64; |
| 511 | int tid; |
| 512 | |
| 513 | tid = lwpid_of (current_thread); |
| 514 | |
| 515 | is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine); |
| 516 | |
| 517 | if (is_elf64) |
| 518 | return tdesc_aarch64; |
| 519 | else |
| 520 | return tdesc_arm_with_neon; |
| 521 | } |
| 522 | |
| 523 | /* Implementation of linux_target_ops method "arch_setup". */ |
| 524 | |
| 525 | static void |
| 526 | aarch64_arch_setup (void) |
| 527 | { |
| 528 | current_process ()->tdesc = aarch64_linux_read_description (); |
| 529 | |
| 530 | aarch64_linux_get_debug_reg_capacity (lwpid_of (current_thread)); |
| 531 | } |
| 532 | |
| 533 | static struct regset_info aarch64_regsets[] = |
| 534 | { |
| 535 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, |
| 536 | sizeof (struct user_pt_regs), GENERAL_REGS, |
| 537 | aarch64_fill_gregset, aarch64_store_gregset }, |
| 538 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, |
| 539 | sizeof (struct user_fpsimd_state), FP_REGS, |
| 540 | aarch64_fill_fpregset, aarch64_store_fpregset |
| 541 | }, |
| 542 | { 0, 0, 0, -1, -1, NULL, NULL } |
| 543 | }; |
| 544 | |
| 545 | static struct regsets_info aarch64_regsets_info = |
| 546 | { |
| 547 | aarch64_regsets, /* regsets */ |
| 548 | 0, /* num_regsets */ |
| 549 | NULL, /* disabled_regsets */ |
| 550 | }; |
| 551 | |
| 552 | static struct regs_info regs_info_aarch64 = |
| 553 | { |
| 554 | NULL, /* regset_bitmap */ |
| 555 | NULL, /* usrregs */ |
| 556 | &aarch64_regsets_info, |
| 557 | }; |
| 558 | |
| 559 | /* Implementation of linux_target_ops method "regs_info". */ |
| 560 | |
| 561 | static const struct regs_info * |
| 562 | aarch64_regs_info (void) |
| 563 | { |
| 564 | if (is_64bit_tdesc ()) |
| 565 | return ®s_info_aarch64; |
| 566 | else |
| 567 | return ®s_info_aarch32; |
| 568 | } |
| 569 | |
| 570 | /* Implementation of linux_target_ops method "supports_tracepoints". */ |
| 571 | |
| 572 | static int |
| 573 | aarch64_supports_tracepoints (void) |
| 574 | { |
| 575 | if (current_thread == NULL) |
| 576 | return 1; |
| 577 | else |
| 578 | { |
| 579 | /* We don't support tracepoints on aarch32 now. */ |
| 580 | return is_64bit_tdesc (); |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | /* Implementation of linux_target_ops method "get_thread_area". */ |
| 585 | |
| 586 | static int |
| 587 | aarch64_get_thread_area (int lwpid, CORE_ADDR *addrp) |
| 588 | { |
| 589 | struct iovec iovec; |
| 590 | uint64_t reg; |
| 591 | |
| 592 | iovec.iov_base = ® |
| 593 | iovec.iov_len = sizeof (reg); |
| 594 | |
| 595 | if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0) |
| 596 | return -1; |
| 597 | |
| 598 | *addrp = reg; |
| 599 | |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | /* List of condition codes that we need. */ |
| 604 | |
| 605 | enum aarch64_condition_codes |
| 606 | { |
| 607 | EQ = 0x0, |
| 608 | NE = 0x1, |
| 609 | LO = 0x3, |
| 610 | GE = 0xa, |
| 611 | LT = 0xb, |
| 612 | GT = 0xc, |
| 613 | LE = 0xd, |
| 614 | }; |
| 615 | |
| 616 | /* Representation of an operand. At this time, it only supports register |
| 617 | and immediate types. */ |
| 618 | |
| 619 | struct aarch64_operand |
| 620 | { |
| 621 | /* Type of the operand. */ |
| 622 | enum |
| 623 | { |
| 624 | OPERAND_IMMEDIATE, |
| 625 | OPERAND_REGISTER, |
| 626 | } type; |
| 627 | /* Value of the operand according to the type. */ |
| 628 | union |
| 629 | { |
| 630 | uint32_t imm; |
| 631 | struct aarch64_register reg; |
| 632 | }; |
| 633 | }; |
| 634 | |
| 635 | /* List of registers that we are currently using, we can add more here as |
| 636 | we need to use them. */ |
| 637 | |
| 638 | /* General purpose scratch registers (64 bit). */ |
| 639 | static const struct aarch64_register x0 = { 0, 1 }; |
| 640 | static const struct aarch64_register x1 = { 1, 1 }; |
| 641 | static const struct aarch64_register x2 = { 2, 1 }; |
| 642 | static const struct aarch64_register x3 = { 3, 1 }; |
| 643 | static const struct aarch64_register x4 = { 4, 1 }; |
| 644 | |
| 645 | /* General purpose scratch registers (32 bit). */ |
| 646 | static const struct aarch64_register w0 = { 0, 0 }; |
| 647 | static const struct aarch64_register w2 = { 2, 0 }; |
| 648 | |
| 649 | /* Intra-procedure scratch registers. */ |
| 650 | static const struct aarch64_register ip0 = { 16, 1 }; |
| 651 | |
| 652 | /* Special purpose registers. */ |
| 653 | static const struct aarch64_register fp = { 29, 1 }; |
| 654 | static const struct aarch64_register lr = { 30, 1 }; |
| 655 | static const struct aarch64_register sp = { 31, 1 }; |
| 656 | static const struct aarch64_register xzr = { 31, 1 }; |
| 657 | |
| 658 | /* Dynamically allocate a new register. If we know the register |
| 659 | statically, we should make it a global as above instead of using this |
| 660 | helper function. */ |
| 661 | |
| 662 | static struct aarch64_register |
| 663 | aarch64_register (unsigned num, int is64) |
| 664 | { |
| 665 | return (struct aarch64_register) { num, is64 }; |
| 666 | } |
| 667 | |
| 668 | /* Helper function to create a register operand, for instructions with |
| 669 | different types of operands. |
| 670 | |
| 671 | For example: |
| 672 | p += emit_mov (p, x0, register_operand (x1)); */ |
| 673 | |
| 674 | static struct aarch64_operand |
| 675 | register_operand (struct aarch64_register reg) |
| 676 | { |
| 677 | struct aarch64_operand operand; |
| 678 | |
| 679 | operand.type = OPERAND_REGISTER; |
| 680 | operand.reg = reg; |
| 681 | |
| 682 | return operand; |
| 683 | } |
| 684 | |
| 685 | /* Helper function to create an immediate operand, for instructions with |
| 686 | different types of operands. |
| 687 | |
| 688 | For example: |
| 689 | p += emit_mov (p, x0, immediate_operand (12)); */ |
| 690 | |
| 691 | static struct aarch64_operand |
| 692 | immediate_operand (uint32_t imm) |
| 693 | { |
| 694 | struct aarch64_operand operand; |
| 695 | |
| 696 | operand.type = OPERAND_IMMEDIATE; |
| 697 | operand.imm = imm; |
| 698 | |
| 699 | return operand; |
| 700 | } |
| 701 | |
| 702 | /* Helper function to create an offset memory operand. |
| 703 | |
| 704 | For example: |
| 705 | p += emit_ldr (p, x0, sp, offset_memory_operand (16)); */ |
| 706 | |
| 707 | static struct aarch64_memory_operand |
| 708 | offset_memory_operand (int32_t offset) |
| 709 | { |
| 710 | return (struct aarch64_memory_operand) { MEMORY_OPERAND_OFFSET, offset }; |
| 711 | } |
| 712 | |
| 713 | /* Helper function to create a pre-index memory operand. |
| 714 | |
| 715 | For example: |
| 716 | p += emit_ldr (p, x0, sp, preindex_memory_operand (16)); */ |
| 717 | |
| 718 | static struct aarch64_memory_operand |
| 719 | preindex_memory_operand (int32_t index) |
| 720 | { |
| 721 | return (struct aarch64_memory_operand) { MEMORY_OPERAND_PREINDEX, index }; |
| 722 | } |
| 723 | |
| 724 | /* Helper function to create a post-index memory operand. |
| 725 | |
| 726 | For example: |
| 727 | p += emit_ldr (p, x0, sp, postindex_memory_operand (16)); */ |
| 728 | |
| 729 | static struct aarch64_memory_operand |
| 730 | postindex_memory_operand (int32_t index) |
| 731 | { |
| 732 | return (struct aarch64_memory_operand) { MEMORY_OPERAND_POSTINDEX, index }; |
| 733 | } |
| 734 | |
| 735 | /* System control registers. These special registers can be written and |
| 736 | read with the MRS and MSR instructions. |
| 737 | |
| 738 | - NZCV: Condition flags. GDB refers to this register under the CPSR |
| 739 | name. |
| 740 | - FPSR: Floating-point status register. |
| 741 | - FPCR: Floating-point control registers. |
| 742 | - TPIDR_EL0: Software thread ID register. */ |
| 743 | |
| 744 | enum aarch64_system_control_registers |
| 745 | { |
| 746 | /* op0 op1 crn crm op2 */ |
| 747 | NZCV = (0x1 << 14) | (0x3 << 11) | (0x4 << 7) | (0x2 << 3) | 0x0, |
| 748 | FPSR = (0x1 << 14) | (0x3 << 11) | (0x4 << 7) | (0x4 << 3) | 0x1, |
| 749 | FPCR = (0x1 << 14) | (0x3 << 11) | (0x4 << 7) | (0x4 << 3) | 0x0, |
| 750 | TPIDR_EL0 = (0x1 << 14) | (0x3 << 11) | (0xd << 7) | (0x0 << 3) | 0x2 |
| 751 | }; |
| 752 | |
| 753 | /* Write a BLR instruction into *BUF. |
| 754 | |
| 755 | BLR rn |
| 756 | |
| 757 | RN is the register to branch to. */ |
| 758 | |
| 759 | static int |
| 760 | emit_blr (uint32_t *buf, struct aarch64_register rn) |
| 761 | { |
| 762 | return aarch64_emit_insn (buf, BLR | ENCODE (rn.num, 5, 5)); |
| 763 | } |
| 764 | |
| 765 | /* Write a RET instruction into *BUF. |
| 766 | |
| 767 | RET xn |
| 768 | |
| 769 | RN is the register to branch to. */ |
| 770 | |
| 771 | static int |
| 772 | emit_ret (uint32_t *buf, struct aarch64_register rn) |
| 773 | { |
| 774 | return aarch64_emit_insn (buf, RET | ENCODE (rn.num, 5, 5)); |
| 775 | } |
| 776 | |
| 777 | static int |
| 778 | emit_load_store_pair (uint32_t *buf, enum aarch64_opcodes opcode, |
| 779 | struct aarch64_register rt, |
| 780 | struct aarch64_register rt2, |
| 781 | struct aarch64_register rn, |
| 782 | struct aarch64_memory_operand operand) |
| 783 | { |
| 784 | uint32_t opc; |
| 785 | uint32_t pre_index; |
| 786 | uint32_t write_back; |
| 787 | |
| 788 | if (rt.is64) |
| 789 | opc = ENCODE (2, 2, 30); |
| 790 | else |
| 791 | opc = ENCODE (0, 2, 30); |
| 792 | |
| 793 | switch (operand.type) |
| 794 | { |
| 795 | case MEMORY_OPERAND_OFFSET: |
| 796 | { |
| 797 | pre_index = ENCODE (1, 1, 24); |
| 798 | write_back = ENCODE (0, 1, 23); |
| 799 | break; |
| 800 | } |
| 801 | case MEMORY_OPERAND_POSTINDEX: |
| 802 | { |
| 803 | pre_index = ENCODE (0, 1, 24); |
| 804 | write_back = ENCODE (1, 1, 23); |
| 805 | break; |
| 806 | } |
| 807 | case MEMORY_OPERAND_PREINDEX: |
| 808 | { |
| 809 | pre_index = ENCODE (1, 1, 24); |
| 810 | write_back = ENCODE (1, 1, 23); |
| 811 | break; |
| 812 | } |
| 813 | default: |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | return aarch64_emit_insn (buf, opcode | opc | pre_index | write_back |
| 818 | | ENCODE (operand.index >> 3, 7, 15) |
| 819 | | ENCODE (rt2.num, 5, 10) |
| 820 | | ENCODE (rn.num, 5, 5) | ENCODE (rt.num, 5, 0)); |
| 821 | } |
| 822 | |
| 823 | /* Write a STP instruction into *BUF. |
| 824 | |
| 825 | STP rt, rt2, [rn, #offset] |
| 826 | STP rt, rt2, [rn, #index]! |
| 827 | STP rt, rt2, [rn], #index |
| 828 | |
| 829 | RT and RT2 are the registers to store. |
| 830 | RN is the base address register. |
| 831 | OFFSET is the immediate to add to the base address. It is limited to a |
| 832 | -512 .. 504 range (7 bits << 3). */ |
| 833 | |
| 834 | static int |
| 835 | emit_stp (uint32_t *buf, struct aarch64_register rt, |
| 836 | struct aarch64_register rt2, struct aarch64_register rn, |
| 837 | struct aarch64_memory_operand operand) |
| 838 | { |
| 839 | return emit_load_store_pair (buf, STP, rt, rt2, rn, operand); |
| 840 | } |
| 841 | |
| 842 | /* Write a LDP instruction into *BUF. |
| 843 | |
| 844 | LDP rt, rt2, [rn, #offset] |
| 845 | LDP rt, rt2, [rn, #index]! |
| 846 | LDP rt, rt2, [rn], #index |
| 847 | |
| 848 | RT and RT2 are the registers to store. |
| 849 | RN is the base address register. |
| 850 | OFFSET is the immediate to add to the base address. It is limited to a |
| 851 | -512 .. 504 range (7 bits << 3). */ |
| 852 | |
| 853 | static int |
| 854 | emit_ldp (uint32_t *buf, struct aarch64_register rt, |
| 855 | struct aarch64_register rt2, struct aarch64_register rn, |
| 856 | struct aarch64_memory_operand operand) |
| 857 | { |
| 858 | return emit_load_store_pair (buf, LDP, rt, rt2, rn, operand); |
| 859 | } |
| 860 | |
| 861 | /* Write a LDP (SIMD&VFP) instruction using Q registers into *BUF. |
| 862 | |
| 863 | LDP qt, qt2, [rn, #offset] |
| 864 | |
| 865 | RT and RT2 are the Q registers to store. |
| 866 | RN is the base address register. |
| 867 | OFFSET is the immediate to add to the base address. It is limited to |
| 868 | -1024 .. 1008 range (7 bits << 4). */ |
| 869 | |
| 870 | static int |
| 871 | emit_ldp_q_offset (uint32_t *buf, unsigned rt, unsigned rt2, |
| 872 | struct aarch64_register rn, int32_t offset) |
| 873 | { |
| 874 | uint32_t opc = ENCODE (2, 2, 30); |
| 875 | uint32_t pre_index = ENCODE (1, 1, 24); |
| 876 | |
| 877 | return aarch64_emit_insn (buf, LDP_SIMD_VFP | opc | pre_index |
| 878 | | ENCODE (offset >> 4, 7, 15) |
| 879 | | ENCODE (rt2, 5, 10) |
| 880 | | ENCODE (rn.num, 5, 5) | ENCODE (rt, 5, 0)); |
| 881 | } |
| 882 | |
| 883 | /* Write a STP (SIMD&VFP) instruction using Q registers into *BUF. |
| 884 | |
| 885 | STP qt, qt2, [rn, #offset] |
| 886 | |
| 887 | RT and RT2 are the Q registers to store. |
| 888 | RN is the base address register. |
| 889 | OFFSET is the immediate to add to the base address. It is limited to |
| 890 | -1024 .. 1008 range (7 bits << 4). */ |
| 891 | |
| 892 | static int |
| 893 | emit_stp_q_offset (uint32_t *buf, unsigned rt, unsigned rt2, |
| 894 | struct aarch64_register rn, int32_t offset) |
| 895 | { |
| 896 | uint32_t opc = ENCODE (2, 2, 30); |
| 897 | uint32_t pre_index = ENCODE (1, 1, 24); |
| 898 | |
| 899 | return aarch64_emit_insn (buf, STP_SIMD_VFP | opc | pre_index |
| 900 | | ENCODE (offset >> 4, 7, 15) |
| 901 | | ENCODE (rt2, 5, 10) |
| 902 | | ENCODE (rn.num, 5, 5) | ENCODE (rt, 5, 0)); |
| 903 | } |
| 904 | |
| 905 | /* Write a LDRH instruction into *BUF. |
| 906 | |
| 907 | LDRH wt, [xn, #offset] |
| 908 | LDRH wt, [xn, #index]! |
| 909 | LDRH wt, [xn], #index |
| 910 | |
| 911 | RT is the register to store. |
| 912 | RN is the base address register. |
| 913 | OFFSET is the immediate to add to the base address. It is limited to |
| 914 | 0 .. 32760 range (12 bits << 3). */ |
| 915 | |
| 916 | static int |
| 917 | emit_ldrh (uint32_t *buf, struct aarch64_register rt, |
| 918 | struct aarch64_register rn, |
| 919 | struct aarch64_memory_operand operand) |
| 920 | { |
| 921 | return aarch64_emit_load_store (buf, 1, LDR, rt, rn, operand); |
| 922 | } |
| 923 | |
| 924 | /* Write a LDRB instruction into *BUF. |
| 925 | |
| 926 | LDRB wt, [xn, #offset] |
| 927 | LDRB wt, [xn, #index]! |
| 928 | LDRB wt, [xn], #index |
| 929 | |
| 930 | RT is the register to store. |
| 931 | RN is the base address register. |
| 932 | OFFSET is the immediate to add to the base address. It is limited to |
| 933 | 0 .. 32760 range (12 bits << 3). */ |
| 934 | |
| 935 | static int |
| 936 | emit_ldrb (uint32_t *buf, struct aarch64_register rt, |
| 937 | struct aarch64_register rn, |
| 938 | struct aarch64_memory_operand operand) |
| 939 | { |
| 940 | return aarch64_emit_load_store (buf, 0, LDR, rt, rn, operand); |
| 941 | } |
| 942 | |
| 943 | |
| 944 | |
| 945 | /* Write a STR instruction into *BUF. |
| 946 | |
| 947 | STR rt, [rn, #offset] |
| 948 | STR rt, [rn, #index]! |
| 949 | STR rt, [rn], #index |
| 950 | |
| 951 | RT is the register to store. |
| 952 | RN is the base address register. |
| 953 | OFFSET is the immediate to add to the base address. It is limited to |
| 954 | 0 .. 32760 range (12 bits << 3). */ |
| 955 | |
| 956 | static int |
| 957 | emit_str (uint32_t *buf, struct aarch64_register rt, |
| 958 | struct aarch64_register rn, |
| 959 | struct aarch64_memory_operand operand) |
| 960 | { |
| 961 | return aarch64_emit_load_store (buf, rt.is64 ? 3 : 2, STR, rt, rn, operand); |
| 962 | } |
| 963 | |
| 964 | /* Helper function emitting an exclusive load or store instruction. */ |
| 965 | |
| 966 | static int |
| 967 | emit_load_store_exclusive (uint32_t *buf, uint32_t size, |
| 968 | enum aarch64_opcodes opcode, |
| 969 | struct aarch64_register rs, |
| 970 | struct aarch64_register rt, |
| 971 | struct aarch64_register rt2, |
| 972 | struct aarch64_register rn) |
| 973 | { |
| 974 | return aarch64_emit_insn (buf, opcode | ENCODE (size, 2, 30) |
| 975 | | ENCODE (rs.num, 5, 16) | ENCODE (rt2.num, 5, 10) |
| 976 | | ENCODE (rn.num, 5, 5) | ENCODE (rt.num, 5, 0)); |
| 977 | } |
| 978 | |
| 979 | /* Write a LAXR instruction into *BUF. |
| 980 | |
| 981 | LDAXR rt, [xn] |
| 982 | |
| 983 | RT is the destination register. |
| 984 | RN is the base address register. */ |
| 985 | |
| 986 | static int |
| 987 | emit_ldaxr (uint32_t *buf, struct aarch64_register rt, |
| 988 | struct aarch64_register rn) |
| 989 | { |
| 990 | return emit_load_store_exclusive (buf, rt.is64 ? 3 : 2, LDAXR, xzr, rt, |
| 991 | xzr, rn); |
| 992 | } |
| 993 | |
| 994 | /* Write a STXR instruction into *BUF. |
| 995 | |
| 996 | STXR ws, rt, [xn] |
| 997 | |
| 998 | RS is the result register, it indicates if the store succeeded or not. |
| 999 | RT is the destination register. |
| 1000 | RN is the base address register. */ |
| 1001 | |
| 1002 | static int |
| 1003 | emit_stxr (uint32_t *buf, struct aarch64_register rs, |
| 1004 | struct aarch64_register rt, struct aarch64_register rn) |
| 1005 | { |
| 1006 | return emit_load_store_exclusive (buf, rt.is64 ? 3 : 2, STXR, rs, rt, |
| 1007 | xzr, rn); |
| 1008 | } |
| 1009 | |
| 1010 | /* Write a STLR instruction into *BUF. |
| 1011 | |
| 1012 | STLR rt, [xn] |
| 1013 | |
| 1014 | RT is the register to store. |
| 1015 | RN is the base address register. */ |
| 1016 | |
| 1017 | static int |
| 1018 | emit_stlr (uint32_t *buf, struct aarch64_register rt, |
| 1019 | struct aarch64_register rn) |
| 1020 | { |
| 1021 | return emit_load_store_exclusive (buf, rt.is64 ? 3 : 2, STLR, xzr, rt, |
| 1022 | xzr, rn); |
| 1023 | } |
| 1024 | |
| 1025 | /* Helper function for data processing instructions with register sources. */ |
| 1026 | |
| 1027 | static int |
| 1028 | emit_data_processing_reg (uint32_t *buf, enum aarch64_opcodes opcode, |
| 1029 | struct aarch64_register rd, |
| 1030 | struct aarch64_register rn, |
| 1031 | struct aarch64_register rm) |
| 1032 | { |
| 1033 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1034 | |
| 1035 | return aarch64_emit_insn (buf, opcode | size | ENCODE (rm.num, 5, 16) |
| 1036 | | ENCODE (rn.num, 5, 5) | ENCODE (rd.num, 5, 0)); |
| 1037 | } |
| 1038 | |
| 1039 | /* Helper function for data processing instructions taking either a register |
| 1040 | or an immediate. */ |
| 1041 | |
| 1042 | static int |
| 1043 | emit_data_processing (uint32_t *buf, enum aarch64_opcodes opcode, |
| 1044 | struct aarch64_register rd, |
| 1045 | struct aarch64_register rn, |
| 1046 | struct aarch64_operand operand) |
| 1047 | { |
| 1048 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1049 | /* The opcode is different for register and immediate source operands. */ |
| 1050 | uint32_t operand_opcode; |
| 1051 | |
| 1052 | if (operand.type == OPERAND_IMMEDIATE) |
| 1053 | { |
| 1054 | /* xxx1 000x xxxx xxxx xxxx xxxx xxxx xxxx */ |
| 1055 | operand_opcode = ENCODE (8, 4, 25); |
| 1056 | |
| 1057 | return aarch64_emit_insn (buf, opcode | operand_opcode | size |
| 1058 | | ENCODE (operand.imm, 12, 10) |
| 1059 | | ENCODE (rn.num, 5, 5) |
| 1060 | | ENCODE (rd.num, 5, 0)); |
| 1061 | } |
| 1062 | else |
| 1063 | { |
| 1064 | /* xxx0 101x xxxx xxxx xxxx xxxx xxxx xxxx */ |
| 1065 | operand_opcode = ENCODE (5, 4, 25); |
| 1066 | |
| 1067 | return emit_data_processing_reg (buf, opcode | operand_opcode, rd, |
| 1068 | rn, operand.reg); |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | /* Write an ADD instruction into *BUF. |
| 1073 | |
| 1074 | ADD rd, rn, #imm |
| 1075 | ADD rd, rn, rm |
| 1076 | |
| 1077 | This function handles both an immediate and register add. |
| 1078 | |
| 1079 | RD is the destination register. |
| 1080 | RN is the input register. |
| 1081 | OPERAND is the source operand, either of type OPERAND_IMMEDIATE or |
| 1082 | OPERAND_REGISTER. */ |
| 1083 | |
| 1084 | static int |
| 1085 | emit_add (uint32_t *buf, struct aarch64_register rd, |
| 1086 | struct aarch64_register rn, struct aarch64_operand operand) |
| 1087 | { |
| 1088 | return emit_data_processing (buf, ADD, rd, rn, operand); |
| 1089 | } |
| 1090 | |
| 1091 | /* Write a SUB instruction into *BUF. |
| 1092 | |
| 1093 | SUB rd, rn, #imm |
| 1094 | SUB rd, rn, rm |
| 1095 | |
| 1096 | This function handles both an immediate and register sub. |
| 1097 | |
| 1098 | RD is the destination register. |
| 1099 | RN is the input register. |
| 1100 | IMM is the immediate to substract to RN. */ |
| 1101 | |
| 1102 | static int |
| 1103 | emit_sub (uint32_t *buf, struct aarch64_register rd, |
| 1104 | struct aarch64_register rn, struct aarch64_operand operand) |
| 1105 | { |
| 1106 | return emit_data_processing (buf, SUB, rd, rn, operand); |
| 1107 | } |
| 1108 | |
| 1109 | /* Write a MOV instruction into *BUF. |
| 1110 | |
| 1111 | MOV rd, #imm |
| 1112 | MOV rd, rm |
| 1113 | |
| 1114 | This function handles both a wide immediate move and a register move, |
| 1115 | with the condition that the source register is not xzr. xzr and the |
| 1116 | stack pointer share the same encoding and this function only supports |
| 1117 | the stack pointer. |
| 1118 | |
| 1119 | RD is the destination register. |
| 1120 | OPERAND is the source operand, either of type OPERAND_IMMEDIATE or |
| 1121 | OPERAND_REGISTER. */ |
| 1122 | |
| 1123 | static int |
| 1124 | emit_mov (uint32_t *buf, struct aarch64_register rd, |
| 1125 | struct aarch64_operand operand) |
| 1126 | { |
| 1127 | if (operand.type == OPERAND_IMMEDIATE) |
| 1128 | { |
| 1129 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1130 | /* Do not shift the immediate. */ |
| 1131 | uint32_t shift = ENCODE (0, 2, 21); |
| 1132 | |
| 1133 | return aarch64_emit_insn (buf, MOV | size | shift |
| 1134 | | ENCODE (operand.imm, 16, 5) |
| 1135 | | ENCODE (rd.num, 5, 0)); |
| 1136 | } |
| 1137 | else |
| 1138 | return emit_add (buf, rd, operand.reg, immediate_operand (0)); |
| 1139 | } |
| 1140 | |
| 1141 | /* Write a MOVK instruction into *BUF. |
| 1142 | |
| 1143 | MOVK rd, #imm, lsl #shift |
| 1144 | |
| 1145 | RD is the destination register. |
| 1146 | IMM is the immediate. |
| 1147 | SHIFT is the logical shift left to apply to IMM. */ |
| 1148 | |
| 1149 | static int |
| 1150 | emit_movk (uint32_t *buf, struct aarch64_register rd, uint32_t imm, |
| 1151 | unsigned shift) |
| 1152 | { |
| 1153 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1154 | |
| 1155 | return aarch64_emit_insn (buf, MOVK | size | ENCODE (shift, 2, 21) | |
| 1156 | ENCODE (imm, 16, 5) | ENCODE (rd.num, 5, 0)); |
| 1157 | } |
| 1158 | |
| 1159 | /* Write instructions into *BUF in order to move ADDR into a register. |
| 1160 | ADDR can be a 64-bit value. |
| 1161 | |
| 1162 | This function will emit a series of MOV and MOVK instructions, such as: |
| 1163 | |
| 1164 | MOV xd, #(addr) |
| 1165 | MOVK xd, #(addr >> 16), lsl #16 |
| 1166 | MOVK xd, #(addr >> 32), lsl #32 |
| 1167 | MOVK xd, #(addr >> 48), lsl #48 */ |
| 1168 | |
| 1169 | static int |
| 1170 | emit_mov_addr (uint32_t *buf, struct aarch64_register rd, CORE_ADDR addr) |
| 1171 | { |
| 1172 | uint32_t *p = buf; |
| 1173 | |
| 1174 | /* The MOV (wide immediate) instruction clears to top bits of the |
| 1175 | register. */ |
| 1176 | p += emit_mov (p, rd, immediate_operand (addr & 0xffff)); |
| 1177 | |
| 1178 | if ((addr >> 16) != 0) |
| 1179 | p += emit_movk (p, rd, (addr >> 16) & 0xffff, 1); |
| 1180 | else |
| 1181 | return p - buf; |
| 1182 | |
| 1183 | if ((addr >> 32) != 0) |
| 1184 | p += emit_movk (p, rd, (addr >> 32) & 0xffff, 2); |
| 1185 | else |
| 1186 | return p - buf; |
| 1187 | |
| 1188 | if ((addr >> 48) != 0) |
| 1189 | p += emit_movk (p, rd, (addr >> 48) & 0xffff, 3); |
| 1190 | |
| 1191 | return p - buf; |
| 1192 | } |
| 1193 | |
| 1194 | /* Write a SUBS instruction into *BUF. |
| 1195 | |
| 1196 | SUBS rd, rn, rm |
| 1197 | |
| 1198 | This instruction update the condition flags. |
| 1199 | |
| 1200 | RD is the destination register. |
| 1201 | RN and RM are the source registers. */ |
| 1202 | |
| 1203 | static int |
| 1204 | emit_subs (uint32_t *buf, struct aarch64_register rd, |
| 1205 | struct aarch64_register rn, struct aarch64_operand operand) |
| 1206 | { |
| 1207 | return emit_data_processing (buf, SUBS, rd, rn, operand); |
| 1208 | } |
| 1209 | |
| 1210 | /* Write a CMP instruction into *BUF. |
| 1211 | |
| 1212 | CMP rn, rm |
| 1213 | |
| 1214 | This instruction is an alias of SUBS xzr, rn, rm. |
| 1215 | |
| 1216 | RN and RM are the registers to compare. */ |
| 1217 | |
| 1218 | static int |
| 1219 | emit_cmp (uint32_t *buf, struct aarch64_register rn, |
| 1220 | struct aarch64_operand operand) |
| 1221 | { |
| 1222 | return emit_subs (buf, xzr, rn, operand); |
| 1223 | } |
| 1224 | |
| 1225 | /* Write a AND instruction into *BUF. |
| 1226 | |
| 1227 | AND rd, rn, rm |
| 1228 | |
| 1229 | RD is the destination register. |
| 1230 | RN and RM are the source registers. */ |
| 1231 | |
| 1232 | static int |
| 1233 | emit_and (uint32_t *buf, struct aarch64_register rd, |
| 1234 | struct aarch64_register rn, struct aarch64_register rm) |
| 1235 | { |
| 1236 | return emit_data_processing_reg (buf, AND, rd, rn, rm); |
| 1237 | } |
| 1238 | |
| 1239 | /* Write a ORR instruction into *BUF. |
| 1240 | |
| 1241 | ORR rd, rn, rm |
| 1242 | |
| 1243 | RD is the destination register. |
| 1244 | RN and RM are the source registers. */ |
| 1245 | |
| 1246 | static int |
| 1247 | emit_orr (uint32_t *buf, struct aarch64_register rd, |
| 1248 | struct aarch64_register rn, struct aarch64_register rm) |
| 1249 | { |
| 1250 | return emit_data_processing_reg (buf, ORR, rd, rn, rm); |
| 1251 | } |
| 1252 | |
| 1253 | /* Write a ORN instruction into *BUF. |
| 1254 | |
| 1255 | ORN rd, rn, rm |
| 1256 | |
| 1257 | RD is the destination register. |
| 1258 | RN and RM are the source registers. */ |
| 1259 | |
| 1260 | static int |
| 1261 | emit_orn (uint32_t *buf, struct aarch64_register rd, |
| 1262 | struct aarch64_register rn, struct aarch64_register rm) |
| 1263 | { |
| 1264 | return emit_data_processing_reg (buf, ORN, rd, rn, rm); |
| 1265 | } |
| 1266 | |
| 1267 | /* Write a EOR instruction into *BUF. |
| 1268 | |
| 1269 | EOR rd, rn, rm |
| 1270 | |
| 1271 | RD is the destination register. |
| 1272 | RN and RM are the source registers. */ |
| 1273 | |
| 1274 | static int |
| 1275 | emit_eor (uint32_t *buf, struct aarch64_register rd, |
| 1276 | struct aarch64_register rn, struct aarch64_register rm) |
| 1277 | { |
| 1278 | return emit_data_processing_reg (buf, EOR, rd, rn, rm); |
| 1279 | } |
| 1280 | |
| 1281 | /* Write a MVN instruction into *BUF. |
| 1282 | |
| 1283 | MVN rd, rm |
| 1284 | |
| 1285 | This is an alias for ORN rd, xzr, rm. |
| 1286 | |
| 1287 | RD is the destination register. |
| 1288 | RM is the source register. */ |
| 1289 | |
| 1290 | static int |
| 1291 | emit_mvn (uint32_t *buf, struct aarch64_register rd, |
| 1292 | struct aarch64_register rm) |
| 1293 | { |
| 1294 | return emit_orn (buf, rd, xzr, rm); |
| 1295 | } |
| 1296 | |
| 1297 | /* Write a LSLV instruction into *BUF. |
| 1298 | |
| 1299 | LSLV rd, rn, rm |
| 1300 | |
| 1301 | RD is the destination register. |
| 1302 | RN and RM are the source registers. */ |
| 1303 | |
| 1304 | static int |
| 1305 | emit_lslv (uint32_t *buf, struct aarch64_register rd, |
| 1306 | struct aarch64_register rn, struct aarch64_register rm) |
| 1307 | { |
| 1308 | return emit_data_processing_reg (buf, LSLV, rd, rn, rm); |
| 1309 | } |
| 1310 | |
| 1311 | /* Write a LSRV instruction into *BUF. |
| 1312 | |
| 1313 | LSRV rd, rn, rm |
| 1314 | |
| 1315 | RD is the destination register. |
| 1316 | RN and RM are the source registers. */ |
| 1317 | |
| 1318 | static int |
| 1319 | emit_lsrv (uint32_t *buf, struct aarch64_register rd, |
| 1320 | struct aarch64_register rn, struct aarch64_register rm) |
| 1321 | { |
| 1322 | return emit_data_processing_reg (buf, LSRV, rd, rn, rm); |
| 1323 | } |
| 1324 | |
| 1325 | /* Write a ASRV instruction into *BUF. |
| 1326 | |
| 1327 | ASRV rd, rn, rm |
| 1328 | |
| 1329 | RD is the destination register. |
| 1330 | RN and RM are the source registers. */ |
| 1331 | |
| 1332 | static int |
| 1333 | emit_asrv (uint32_t *buf, struct aarch64_register rd, |
| 1334 | struct aarch64_register rn, struct aarch64_register rm) |
| 1335 | { |
| 1336 | return emit_data_processing_reg (buf, ASRV, rd, rn, rm); |
| 1337 | } |
| 1338 | |
| 1339 | /* Write a MUL instruction into *BUF. |
| 1340 | |
| 1341 | MUL rd, rn, rm |
| 1342 | |
| 1343 | RD is the destination register. |
| 1344 | RN and RM are the source registers. */ |
| 1345 | |
| 1346 | static int |
| 1347 | emit_mul (uint32_t *buf, struct aarch64_register rd, |
| 1348 | struct aarch64_register rn, struct aarch64_register rm) |
| 1349 | { |
| 1350 | return emit_data_processing_reg (buf, MUL, rd, rn, rm); |
| 1351 | } |
| 1352 | |
| 1353 | /* Write a MRS instruction into *BUF. The register size is 64-bit. |
| 1354 | |
| 1355 | MRS xt, system_reg |
| 1356 | |
| 1357 | RT is the destination register. |
| 1358 | SYSTEM_REG is special purpose register to read. */ |
| 1359 | |
| 1360 | static int |
| 1361 | emit_mrs (uint32_t *buf, struct aarch64_register rt, |
| 1362 | enum aarch64_system_control_registers system_reg) |
| 1363 | { |
| 1364 | return aarch64_emit_insn (buf, MRS | ENCODE (system_reg, 15, 5) |
| 1365 | | ENCODE (rt.num, 5, 0)); |
| 1366 | } |
| 1367 | |
| 1368 | /* Write a MSR instruction into *BUF. The register size is 64-bit. |
| 1369 | |
| 1370 | MSR system_reg, xt |
| 1371 | |
| 1372 | SYSTEM_REG is special purpose register to write. |
| 1373 | RT is the input register. */ |
| 1374 | |
| 1375 | static int |
| 1376 | emit_msr (uint32_t *buf, enum aarch64_system_control_registers system_reg, |
| 1377 | struct aarch64_register rt) |
| 1378 | { |
| 1379 | return aarch64_emit_insn (buf, MSR | ENCODE (system_reg, 15, 5) |
| 1380 | | ENCODE (rt.num, 5, 0)); |
| 1381 | } |
| 1382 | |
| 1383 | /* Write a SEVL instruction into *BUF. |
| 1384 | |
| 1385 | This is a hint instruction telling the hardware to trigger an event. */ |
| 1386 | |
| 1387 | static int |
| 1388 | emit_sevl (uint32_t *buf) |
| 1389 | { |
| 1390 | return aarch64_emit_insn (buf, SEVL); |
| 1391 | } |
| 1392 | |
| 1393 | /* Write a WFE instruction into *BUF. |
| 1394 | |
| 1395 | This is a hint instruction telling the hardware to wait for an event. */ |
| 1396 | |
| 1397 | static int |
| 1398 | emit_wfe (uint32_t *buf) |
| 1399 | { |
| 1400 | return aarch64_emit_insn (buf, WFE); |
| 1401 | } |
| 1402 | |
| 1403 | /* Write a SBFM instruction into *BUF. |
| 1404 | |
| 1405 | SBFM rd, rn, #immr, #imms |
| 1406 | |
| 1407 | This instruction moves the bits from #immr to #imms into the |
| 1408 | destination, sign extending the result. |
| 1409 | |
| 1410 | RD is the destination register. |
| 1411 | RN is the source register. |
| 1412 | IMMR is the bit number to start at (least significant bit). |
| 1413 | IMMS is the bit number to stop at (most significant bit). */ |
| 1414 | |
| 1415 | static int |
| 1416 | emit_sbfm (uint32_t *buf, struct aarch64_register rd, |
| 1417 | struct aarch64_register rn, uint32_t immr, uint32_t imms) |
| 1418 | { |
| 1419 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1420 | uint32_t n = ENCODE (rd.is64, 1, 22); |
| 1421 | |
| 1422 | return aarch64_emit_insn (buf, SBFM | size | n | ENCODE (immr, 6, 16) |
| 1423 | | ENCODE (imms, 6, 10) | ENCODE (rn.num, 5, 5) |
| 1424 | | ENCODE (rd.num, 5, 0)); |
| 1425 | } |
| 1426 | |
| 1427 | /* Write a SBFX instruction into *BUF. |
| 1428 | |
| 1429 | SBFX rd, rn, #lsb, #width |
| 1430 | |
| 1431 | This instruction moves #width bits from #lsb into the destination, sign |
| 1432 | extending the result. This is an alias for: |
| 1433 | |
| 1434 | SBFM rd, rn, #lsb, #(lsb + width - 1) |
| 1435 | |
| 1436 | RD is the destination register. |
| 1437 | RN is the source register. |
| 1438 | LSB is the bit number to start at (least significant bit). |
| 1439 | WIDTH is the number of bits to move. */ |
| 1440 | |
| 1441 | static int |
| 1442 | emit_sbfx (uint32_t *buf, struct aarch64_register rd, |
| 1443 | struct aarch64_register rn, uint32_t lsb, uint32_t width) |
| 1444 | { |
| 1445 | return emit_sbfm (buf, rd, rn, lsb, lsb + width - 1); |
| 1446 | } |
| 1447 | |
| 1448 | /* Write a UBFM instruction into *BUF. |
| 1449 | |
| 1450 | UBFM rd, rn, #immr, #imms |
| 1451 | |
| 1452 | This instruction moves the bits from #immr to #imms into the |
| 1453 | destination, extending the result with zeros. |
| 1454 | |
| 1455 | RD is the destination register. |
| 1456 | RN is the source register. |
| 1457 | IMMR is the bit number to start at (least significant bit). |
| 1458 | IMMS is the bit number to stop at (most significant bit). */ |
| 1459 | |
| 1460 | static int |
| 1461 | emit_ubfm (uint32_t *buf, struct aarch64_register rd, |
| 1462 | struct aarch64_register rn, uint32_t immr, uint32_t imms) |
| 1463 | { |
| 1464 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1465 | uint32_t n = ENCODE (rd.is64, 1, 22); |
| 1466 | |
| 1467 | return aarch64_emit_insn (buf, UBFM | size | n | ENCODE (immr, 6, 16) |
| 1468 | | ENCODE (imms, 6, 10) | ENCODE (rn.num, 5, 5) |
| 1469 | | ENCODE (rd.num, 5, 0)); |
| 1470 | } |
| 1471 | |
| 1472 | /* Write a UBFX instruction into *BUF. |
| 1473 | |
| 1474 | UBFX rd, rn, #lsb, #width |
| 1475 | |
| 1476 | This instruction moves #width bits from #lsb into the destination, |
| 1477 | extending the result with zeros. This is an alias for: |
| 1478 | |
| 1479 | UBFM rd, rn, #lsb, #(lsb + width - 1) |
| 1480 | |
| 1481 | RD is the destination register. |
| 1482 | RN is the source register. |
| 1483 | LSB is the bit number to start at (least significant bit). |
| 1484 | WIDTH is the number of bits to move. */ |
| 1485 | |
| 1486 | static int |
| 1487 | emit_ubfx (uint32_t *buf, struct aarch64_register rd, |
| 1488 | struct aarch64_register rn, uint32_t lsb, uint32_t width) |
| 1489 | { |
| 1490 | return emit_ubfm (buf, rd, rn, lsb, lsb + width - 1); |
| 1491 | } |
| 1492 | |
| 1493 | /* Write a CSINC instruction into *BUF. |
| 1494 | |
| 1495 | CSINC rd, rn, rm, cond |
| 1496 | |
| 1497 | This instruction conditionally increments rn or rm and places the result |
| 1498 | in rd. rn is chosen is the condition is true. |
| 1499 | |
| 1500 | RD is the destination register. |
| 1501 | RN and RM are the source registers. |
| 1502 | COND is the encoded condition. */ |
| 1503 | |
| 1504 | static int |
| 1505 | emit_csinc (uint32_t *buf, struct aarch64_register rd, |
| 1506 | struct aarch64_register rn, struct aarch64_register rm, |
| 1507 | unsigned cond) |
| 1508 | { |
| 1509 | uint32_t size = ENCODE (rd.is64, 1, 31); |
| 1510 | |
| 1511 | return aarch64_emit_insn (buf, CSINC | size | ENCODE (rm.num, 5, 16) |
| 1512 | | ENCODE (cond, 4, 12) | ENCODE (rn.num, 5, 5) |
| 1513 | | ENCODE (rd.num, 5, 0)); |
| 1514 | } |
| 1515 | |
| 1516 | /* Write a CSET instruction into *BUF. |
| 1517 | |
| 1518 | CSET rd, cond |
| 1519 | |
| 1520 | This instruction conditionally write 1 or 0 in the destination register. |
| 1521 | 1 is written if the condition is true. This is an alias for: |
| 1522 | |
| 1523 | CSINC rd, xzr, xzr, !cond |
| 1524 | |
| 1525 | Note that the condition needs to be inverted. |
| 1526 | |
| 1527 | RD is the destination register. |
| 1528 | RN and RM are the source registers. |
| 1529 | COND is the encoded condition. */ |
| 1530 | |
| 1531 | static int |
| 1532 | emit_cset (uint32_t *buf, struct aarch64_register rd, unsigned cond) |
| 1533 | { |
| 1534 | /* The least significant bit of the condition needs toggling in order to |
| 1535 | invert it. */ |
| 1536 | return emit_csinc (buf, rd, xzr, xzr, cond ^ 0x1); |
| 1537 | } |
| 1538 | |
| 1539 | /* Write LEN instructions from BUF into the inferior memory at *TO. |
| 1540 | |
| 1541 | Note instructions are always little endian on AArch64, unlike data. */ |
| 1542 | |
| 1543 | static void |
| 1544 | append_insns (CORE_ADDR *to, size_t len, const uint32_t *buf) |
| 1545 | { |
| 1546 | size_t byte_len = len * sizeof (uint32_t); |
| 1547 | #if (__BYTE_ORDER == __BIG_ENDIAN) |
| 1548 | uint32_t *le_buf = xmalloc (byte_len); |
| 1549 | size_t i; |
| 1550 | |
| 1551 | for (i = 0; i < len; i++) |
| 1552 | le_buf[i] = htole32 (buf[i]); |
| 1553 | |
| 1554 | write_inferior_memory (*to, (const unsigned char *) le_buf, byte_len); |
| 1555 | |
| 1556 | xfree (le_buf); |
| 1557 | #else |
| 1558 | write_inferior_memory (*to, (const unsigned char *) buf, byte_len); |
| 1559 | #endif |
| 1560 | |
| 1561 | *to += byte_len; |
| 1562 | } |
| 1563 | |
| 1564 | /* Sub-class of struct aarch64_insn_data, store information of |
| 1565 | instruction relocation for fast tracepoint. Visitor can |
| 1566 | relocate an instruction from BASE.INSN_ADDR to NEW_ADDR and save |
| 1567 | the relocated instructions in buffer pointed by INSN_PTR. */ |
| 1568 | |
| 1569 | struct aarch64_insn_relocation_data |
| 1570 | { |
| 1571 | struct aarch64_insn_data base; |
| 1572 | |
| 1573 | /* The new address the instruction is relocated to. */ |
| 1574 | CORE_ADDR new_addr; |
| 1575 | /* Pointer to the buffer of relocated instruction(s). */ |
| 1576 | uint32_t *insn_ptr; |
| 1577 | }; |
| 1578 | |
| 1579 | /* Implementation of aarch64_insn_visitor method "b". */ |
| 1580 | |
| 1581 | static void |
| 1582 | aarch64_ftrace_insn_reloc_b (const int is_bl, const int32_t offset, |
| 1583 | struct aarch64_insn_data *data) |
| 1584 | { |
| 1585 | struct aarch64_insn_relocation_data *insn_reloc |
| 1586 | = (struct aarch64_insn_relocation_data *) data; |
| 1587 | int32_t new_offset |
| 1588 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
| 1589 | |
| 1590 | if (can_encode_int32 (new_offset, 28)) |
| 1591 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, is_bl, new_offset); |
| 1592 | } |
| 1593 | |
| 1594 | /* Implementation of aarch64_insn_visitor method "b_cond". */ |
| 1595 | |
| 1596 | static void |
| 1597 | aarch64_ftrace_insn_reloc_b_cond (const unsigned cond, const int32_t offset, |
| 1598 | struct aarch64_insn_data *data) |
| 1599 | { |
| 1600 | struct aarch64_insn_relocation_data *insn_reloc |
| 1601 | = (struct aarch64_insn_relocation_data *) data; |
| 1602 | int32_t new_offset |
| 1603 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
| 1604 | |
| 1605 | if (can_encode_int32 (new_offset, 21)) |
| 1606 | { |
| 1607 | insn_reloc->insn_ptr += emit_bcond (insn_reloc->insn_ptr, cond, |
| 1608 | new_offset); |
| 1609 | } |
| 1610 | else if (can_encode_int32 (new_offset, 28)) |
| 1611 | { |
| 1612 | /* The offset is out of range for a conditional branch |
| 1613 | instruction but not for a unconditional branch. We can use |
| 1614 | the following instructions instead: |
| 1615 | |
| 1616 | B.COND TAKEN ; If cond is true, then jump to TAKEN. |
| 1617 | B NOT_TAKEN ; Else jump over TAKEN and continue. |
| 1618 | TAKEN: |
| 1619 | B #(offset - 8) |
| 1620 | NOT_TAKEN: |
| 1621 | |
| 1622 | */ |
| 1623 | |
| 1624 | insn_reloc->insn_ptr += emit_bcond (insn_reloc->insn_ptr, cond, 8); |
| 1625 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, 8); |
| 1626 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, new_offset - 8); |
| 1627 | } |
| 1628 | } |
| 1629 | |
| 1630 | /* Implementation of aarch64_insn_visitor method "cb". */ |
| 1631 | |
| 1632 | static void |
| 1633 | aarch64_ftrace_insn_reloc_cb (const int32_t offset, const int is_cbnz, |
| 1634 | const unsigned rn, int is64, |
| 1635 | struct aarch64_insn_data *data) |
| 1636 | { |
| 1637 | struct aarch64_insn_relocation_data *insn_reloc |
| 1638 | = (struct aarch64_insn_relocation_data *) data; |
| 1639 | int32_t new_offset |
| 1640 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
| 1641 | |
| 1642 | if (can_encode_int32 (new_offset, 21)) |
| 1643 | { |
| 1644 | insn_reloc->insn_ptr += emit_cb (insn_reloc->insn_ptr, is_cbnz, |
| 1645 | aarch64_register (rn, is64), new_offset); |
| 1646 | } |
| 1647 | else if (can_encode_int32 (new_offset, 28)) |
| 1648 | { |
| 1649 | /* The offset is out of range for a compare and branch |
| 1650 | instruction but not for a unconditional branch. We can use |
| 1651 | the following instructions instead: |
| 1652 | |
| 1653 | CBZ xn, TAKEN ; xn == 0, then jump to TAKEN. |
| 1654 | B NOT_TAKEN ; Else jump over TAKEN and continue. |
| 1655 | TAKEN: |
| 1656 | B #(offset - 8) |
| 1657 | NOT_TAKEN: |
| 1658 | |
| 1659 | */ |
| 1660 | insn_reloc->insn_ptr += emit_cb (insn_reloc->insn_ptr, is_cbnz, |
| 1661 | aarch64_register (rn, is64), 8); |
| 1662 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, 8); |
| 1663 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, new_offset - 8); |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | /* Implementation of aarch64_insn_visitor method "tb". */ |
| 1668 | |
| 1669 | static void |
| 1670 | aarch64_ftrace_insn_reloc_tb (const int32_t offset, int is_tbnz, |
| 1671 | const unsigned rt, unsigned bit, |
| 1672 | struct aarch64_insn_data *data) |
| 1673 | { |
| 1674 | struct aarch64_insn_relocation_data *insn_reloc |
| 1675 | = (struct aarch64_insn_relocation_data *) data; |
| 1676 | int32_t new_offset |
| 1677 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
| 1678 | |
| 1679 | if (can_encode_int32 (new_offset, 16)) |
| 1680 | { |
| 1681 | insn_reloc->insn_ptr += emit_tb (insn_reloc->insn_ptr, is_tbnz, bit, |
| 1682 | aarch64_register (rt, 1), new_offset); |
| 1683 | } |
| 1684 | else if (can_encode_int32 (new_offset, 28)) |
| 1685 | { |
| 1686 | /* The offset is out of range for a test bit and branch |
| 1687 | instruction but not for a unconditional branch. We can use |
| 1688 | the following instructions instead: |
| 1689 | |
| 1690 | TBZ xn, #bit, TAKEN ; xn[bit] == 0, then jump to TAKEN. |
| 1691 | B NOT_TAKEN ; Else jump over TAKEN and continue. |
| 1692 | TAKEN: |
| 1693 | B #(offset - 8) |
| 1694 | NOT_TAKEN: |
| 1695 | |
| 1696 | */ |
| 1697 | insn_reloc->insn_ptr += emit_tb (insn_reloc->insn_ptr, is_tbnz, bit, |
| 1698 | aarch64_register (rt, 1), 8); |
| 1699 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, 8); |
| 1700 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, |
| 1701 | new_offset - 8); |
| 1702 | } |
| 1703 | } |
| 1704 | |
| 1705 | /* Implementation of aarch64_insn_visitor method "adr". */ |
| 1706 | |
| 1707 | static void |
| 1708 | aarch64_ftrace_insn_reloc_adr (const int32_t offset, const unsigned rd, |
| 1709 | const int is_adrp, |
| 1710 | struct aarch64_insn_data *data) |
| 1711 | { |
| 1712 | struct aarch64_insn_relocation_data *insn_reloc |
| 1713 | = (struct aarch64_insn_relocation_data *) data; |
| 1714 | /* We know exactly the address the ADR{P,} instruction will compute. |
| 1715 | We can just write it to the destination register. */ |
| 1716 | CORE_ADDR address = data->insn_addr + offset; |
| 1717 | |
| 1718 | if (is_adrp) |
| 1719 | { |
| 1720 | /* Clear the lower 12 bits of the offset to get the 4K page. */ |
| 1721 | insn_reloc->insn_ptr += emit_mov_addr (insn_reloc->insn_ptr, |
| 1722 | aarch64_register (rd, 1), |
| 1723 | address & ~0xfff); |
| 1724 | } |
| 1725 | else |
| 1726 | insn_reloc->insn_ptr += emit_mov_addr (insn_reloc->insn_ptr, |
| 1727 | aarch64_register (rd, 1), address); |
| 1728 | } |
| 1729 | |
| 1730 | /* Implementation of aarch64_insn_visitor method "ldr_literal". */ |
| 1731 | |
| 1732 | static void |
| 1733 | aarch64_ftrace_insn_reloc_ldr_literal (const int32_t offset, const int is_sw, |
| 1734 | const unsigned rt, const int is64, |
| 1735 | struct aarch64_insn_data *data) |
| 1736 | { |
| 1737 | struct aarch64_insn_relocation_data *insn_reloc |
| 1738 | = (struct aarch64_insn_relocation_data *) data; |
| 1739 | CORE_ADDR address = data->insn_addr + offset; |
| 1740 | |
| 1741 | insn_reloc->insn_ptr += emit_mov_addr (insn_reloc->insn_ptr, |
| 1742 | aarch64_register (rt, 1), address); |
| 1743 | |
| 1744 | /* We know exactly what address to load from, and what register we |
| 1745 | can use: |
| 1746 | |
| 1747 | MOV xd, #(oldloc + offset) |
| 1748 | MOVK xd, #((oldloc + offset) >> 16), lsl #16 |
| 1749 | ... |
| 1750 | |
| 1751 | LDR xd, [xd] ; or LDRSW xd, [xd] |
| 1752 | |
| 1753 | */ |
| 1754 | |
| 1755 | if (is_sw) |
| 1756 | insn_reloc->insn_ptr += emit_ldrsw (insn_reloc->insn_ptr, |
| 1757 | aarch64_register (rt, 1), |
| 1758 | aarch64_register (rt, 1), |
| 1759 | offset_memory_operand (0)); |
| 1760 | else |
| 1761 | insn_reloc->insn_ptr += emit_ldr (insn_reloc->insn_ptr, |
| 1762 | aarch64_register (rt, is64), |
| 1763 | aarch64_register (rt, 1), |
| 1764 | offset_memory_operand (0)); |
| 1765 | } |
| 1766 | |
| 1767 | /* Implementation of aarch64_insn_visitor method "others". */ |
| 1768 | |
| 1769 | static void |
| 1770 | aarch64_ftrace_insn_reloc_others (const uint32_t insn, |
| 1771 | struct aarch64_insn_data *data) |
| 1772 | { |
| 1773 | struct aarch64_insn_relocation_data *insn_reloc |
| 1774 | = (struct aarch64_insn_relocation_data *) data; |
| 1775 | |
| 1776 | /* The instruction is not PC relative. Just re-emit it at the new |
| 1777 | location. */ |
| 1778 | insn_reloc->insn_ptr += aarch64_emit_insn (insn_reloc->insn_ptr, insn); |
| 1779 | } |
| 1780 | |
| 1781 | static const struct aarch64_insn_visitor visitor = |
| 1782 | { |
| 1783 | aarch64_ftrace_insn_reloc_b, |
| 1784 | aarch64_ftrace_insn_reloc_b_cond, |
| 1785 | aarch64_ftrace_insn_reloc_cb, |
| 1786 | aarch64_ftrace_insn_reloc_tb, |
| 1787 | aarch64_ftrace_insn_reloc_adr, |
| 1788 | aarch64_ftrace_insn_reloc_ldr_literal, |
| 1789 | aarch64_ftrace_insn_reloc_others, |
| 1790 | }; |
| 1791 | |
| 1792 | /* Implementation of linux_target_ops method |
| 1793 | "install_fast_tracepoint_jump_pad". */ |
| 1794 | |
| 1795 | static int |
| 1796 | aarch64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, |
| 1797 | CORE_ADDR tpaddr, |
| 1798 | CORE_ADDR collector, |
| 1799 | CORE_ADDR lockaddr, |
| 1800 | ULONGEST orig_size, |
| 1801 | CORE_ADDR *jump_entry, |
| 1802 | CORE_ADDR *trampoline, |
| 1803 | ULONGEST *trampoline_size, |
| 1804 | unsigned char *jjump_pad_insn, |
| 1805 | ULONGEST *jjump_pad_insn_size, |
| 1806 | CORE_ADDR *adjusted_insn_addr, |
| 1807 | CORE_ADDR *adjusted_insn_addr_end, |
| 1808 | char *err) |
| 1809 | { |
| 1810 | uint32_t buf[256]; |
| 1811 | uint32_t *p = buf; |
| 1812 | int32_t offset; |
| 1813 | int i; |
| 1814 | uint32_t insn; |
| 1815 | CORE_ADDR buildaddr = *jump_entry; |
| 1816 | struct aarch64_insn_relocation_data insn_data; |
| 1817 | |
| 1818 | /* We need to save the current state on the stack both to restore it |
| 1819 | later and to collect register values when the tracepoint is hit. |
| 1820 | |
| 1821 | The saved registers are pushed in a layout that needs to be in sync |
| 1822 | with aarch64_ft_collect_regmap (see linux-aarch64-ipa.c). Later on |
| 1823 | the supply_fast_tracepoint_registers function will fill in the |
| 1824 | register cache from a pointer to saved registers on the stack we build |
| 1825 | here. |
| 1826 | |
| 1827 | For simplicity, we set the size of each cell on the stack to 16 bytes. |
| 1828 | This way one cell can hold any register type, from system registers |
| 1829 | to the 128 bit SIMD&FP registers. Furthermore, the stack pointer |
| 1830 | has to be 16 bytes aligned anyway. |
| 1831 | |
| 1832 | Note that the CPSR register does not exist on AArch64. Instead we |
| 1833 | can access system bits describing the process state with the |
| 1834 | MRS/MSR instructions, namely the condition flags. We save them as |
| 1835 | if they are part of a CPSR register because that's how GDB |
| 1836 | interprets these system bits. At the moment, only the condition |
| 1837 | flags are saved in CPSR (NZCV). |
| 1838 | |
| 1839 | Stack layout, each cell is 16 bytes (descending): |
| 1840 | |
| 1841 | High *-------- SIMD&FP registers from 31 down to 0. --------* |
| 1842 | | q31 | |
| 1843 | . . |
| 1844 | . . 32 cells |
| 1845 | . . |
| 1846 | | q0 | |
| 1847 | *---- General purpose registers from 30 down to 0. ----* |
| 1848 | | x30 | |
| 1849 | . . |
| 1850 | . . 31 cells |
| 1851 | . . |
| 1852 | | x0 | |
| 1853 | *------------- Special purpose registers. -------------* |
| 1854 | | SP | |
| 1855 | | PC | |
| 1856 | | CPSR (NZCV) | 5 cells |
| 1857 | | FPSR | |
| 1858 | | FPCR | <- SP + 16 |
| 1859 | *------------- collecting_t object --------------------* |
| 1860 | | TPIDR_EL0 | struct tracepoint * | |
| 1861 | Low *------------------------------------------------------* |
| 1862 | |
| 1863 | After this stack is set up, we issue a call to the collector, passing |
| 1864 | it the saved registers at (SP + 16). */ |
| 1865 | |
| 1866 | /* Push SIMD&FP registers on the stack: |
| 1867 | |
| 1868 | SUB sp, sp, #(32 * 16) |
| 1869 | |
| 1870 | STP q30, q31, [sp, #(30 * 16)] |
| 1871 | ... |
| 1872 | STP q0, q1, [sp] |
| 1873 | |
| 1874 | */ |
| 1875 | p += emit_sub (p, sp, sp, immediate_operand (32 * 16)); |
| 1876 | for (i = 30; i >= 0; i -= 2) |
| 1877 | p += emit_stp_q_offset (p, i, i + 1, sp, i * 16); |
| 1878 | |
| 1879 | /* Push general puspose registers on the stack. Note that we do not need |
| 1880 | to push x31 as it represents the xzr register and not the stack |
| 1881 | pointer in a STR instruction. |
| 1882 | |
| 1883 | SUB sp, sp, #(31 * 16) |
| 1884 | |
| 1885 | STR x30, [sp, #(30 * 16)] |
| 1886 | ... |
| 1887 | STR x0, [sp] |
| 1888 | |
| 1889 | */ |
| 1890 | p += emit_sub (p, sp, sp, immediate_operand (31 * 16)); |
| 1891 | for (i = 30; i >= 0; i -= 1) |
| 1892 | p += emit_str (p, aarch64_register (i, 1), sp, |
| 1893 | offset_memory_operand (i * 16)); |
| 1894 | |
| 1895 | /* Make space for 5 more cells. |
| 1896 | |
| 1897 | SUB sp, sp, #(5 * 16) |
| 1898 | |
| 1899 | */ |
| 1900 | p += emit_sub (p, sp, sp, immediate_operand (5 * 16)); |
| 1901 | |
| 1902 | |
| 1903 | /* Save SP: |
| 1904 | |
| 1905 | ADD x4, sp, #((32 + 31 + 5) * 16) |
| 1906 | STR x4, [sp, #(4 * 16)] |
| 1907 | |
| 1908 | */ |
| 1909 | p += emit_add (p, x4, sp, immediate_operand ((32 + 31 + 5) * 16)); |
| 1910 | p += emit_str (p, x4, sp, offset_memory_operand (4 * 16)); |
| 1911 | |
| 1912 | /* Save PC (tracepoint address): |
| 1913 | |
| 1914 | MOV x3, #(tpaddr) |
| 1915 | ... |
| 1916 | |
| 1917 | STR x3, [sp, #(3 * 16)] |
| 1918 | |
| 1919 | */ |
| 1920 | |
| 1921 | p += emit_mov_addr (p, x3, tpaddr); |
| 1922 | p += emit_str (p, x3, sp, offset_memory_operand (3 * 16)); |
| 1923 | |
| 1924 | /* Save CPSR (NZCV), FPSR and FPCR: |
| 1925 | |
| 1926 | MRS x2, nzcv |
| 1927 | MRS x1, fpsr |
| 1928 | MRS x0, fpcr |
| 1929 | |
| 1930 | STR x2, [sp, #(2 * 16)] |
| 1931 | STR x1, [sp, #(1 * 16)] |
| 1932 | STR x0, [sp, #(0 * 16)] |
| 1933 | |
| 1934 | */ |
| 1935 | p += emit_mrs (p, x2, NZCV); |
| 1936 | p += emit_mrs (p, x1, FPSR); |
| 1937 | p += emit_mrs (p, x0, FPCR); |
| 1938 | p += emit_str (p, x2, sp, offset_memory_operand (2 * 16)); |
| 1939 | p += emit_str (p, x1, sp, offset_memory_operand (1 * 16)); |
| 1940 | p += emit_str (p, x0, sp, offset_memory_operand (0 * 16)); |
| 1941 | |
| 1942 | /* Push the collecting_t object. It consist of the address of the |
| 1943 | tracepoint and an ID for the current thread. We get the latter by |
| 1944 | reading the tpidr_el0 system register. It corresponds to the |
| 1945 | NT_ARM_TLS register accessible with ptrace. |
| 1946 | |
| 1947 | MOV x0, #(tpoint) |
| 1948 | ... |
| 1949 | |
| 1950 | MRS x1, tpidr_el0 |
| 1951 | |
| 1952 | STP x0, x1, [sp, #-16]! |
| 1953 | |
| 1954 | */ |
| 1955 | |
| 1956 | p += emit_mov_addr (p, x0, tpoint); |
| 1957 | p += emit_mrs (p, x1, TPIDR_EL0); |
| 1958 | p += emit_stp (p, x0, x1, sp, preindex_memory_operand (-16)); |
| 1959 | |
| 1960 | /* Spin-lock: |
| 1961 | |
| 1962 | The shared memory for the lock is at lockaddr. It will hold zero |
| 1963 | if no-one is holding the lock, otherwise it contains the address of |
| 1964 | the collecting_t object on the stack of the thread which acquired it. |
| 1965 | |
| 1966 | At this stage, the stack pointer points to this thread's collecting_t |
| 1967 | object. |
| 1968 | |
| 1969 | We use the following registers: |
| 1970 | - x0: Address of the lock. |
| 1971 | - x1: Pointer to collecting_t object. |
| 1972 | - x2: Scratch register. |
| 1973 | |
| 1974 | MOV x0, #(lockaddr) |
| 1975 | ... |
| 1976 | MOV x1, sp |
| 1977 | |
| 1978 | ; Trigger an event local to this core. So the following WFE |
| 1979 | ; instruction is ignored. |
| 1980 | SEVL |
| 1981 | again: |
| 1982 | ; Wait for an event. The event is triggered by either the SEVL |
| 1983 | ; or STLR instructions (store release). |
| 1984 | WFE |
| 1985 | |
| 1986 | ; Atomically read at lockaddr. This marks the memory location as |
| 1987 | ; exclusive. This instruction also has memory constraints which |
| 1988 | ; make sure all previous data reads and writes are done before |
| 1989 | ; executing it. |
| 1990 | LDAXR x2, [x0] |
| 1991 | |
| 1992 | ; Try again if another thread holds the lock. |
| 1993 | CBNZ x2, again |
| 1994 | |
| 1995 | ; We can lock it! Write the address of the collecting_t object. |
| 1996 | ; This instruction will fail if the memory location is not marked |
| 1997 | ; as exclusive anymore. If it succeeds, it will remove the |
| 1998 | ; exclusive mark on the memory location. This way, if another |
| 1999 | ; thread executes this instruction before us, we will fail and try |
| 2000 | ; all over again. |
| 2001 | STXR w2, x1, [x0] |
| 2002 | CBNZ w2, again |
| 2003 | |
| 2004 | */ |
| 2005 | |
| 2006 | p += emit_mov_addr (p, x0, lockaddr); |
| 2007 | p += emit_mov (p, x1, register_operand (sp)); |
| 2008 | |
| 2009 | p += emit_sevl (p); |
| 2010 | p += emit_wfe (p); |
| 2011 | p += emit_ldaxr (p, x2, x0); |
| 2012 | p += emit_cb (p, 1, w2, -2 * 4); |
| 2013 | p += emit_stxr (p, w2, x1, x0); |
| 2014 | p += emit_cb (p, 1, x2, -4 * 4); |
| 2015 | |
| 2016 | /* Call collector (struct tracepoint *, unsigned char *): |
| 2017 | |
| 2018 | MOV x0, #(tpoint) |
| 2019 | ... |
| 2020 | |
| 2021 | ; Saved registers start after the collecting_t object. |
| 2022 | ADD x1, sp, #16 |
| 2023 | |
| 2024 | ; We use an intra-procedure-call scratch register. |
| 2025 | MOV ip0, #(collector) |
| 2026 | ... |
| 2027 | |
| 2028 | ; And call back to C! |
| 2029 | BLR ip0 |
| 2030 | |
| 2031 | */ |
| 2032 | |
| 2033 | p += emit_mov_addr (p, x0, tpoint); |
| 2034 | p += emit_add (p, x1, sp, immediate_operand (16)); |
| 2035 | |
| 2036 | p += emit_mov_addr (p, ip0, collector); |
| 2037 | p += emit_blr (p, ip0); |
| 2038 | |
| 2039 | /* Release the lock. |
| 2040 | |
| 2041 | MOV x0, #(lockaddr) |
| 2042 | ... |
| 2043 | |
| 2044 | ; This instruction is a normal store with memory ordering |
| 2045 | ; constraints. Thanks to this we do not have to put a data |
| 2046 | ; barrier instruction to make sure all data read and writes are done |
| 2047 | ; before this instruction is executed. Furthermore, this instrucion |
| 2048 | ; will trigger an event, letting other threads know they can grab |
| 2049 | ; the lock. |
| 2050 | STLR xzr, [x0] |
| 2051 | |
| 2052 | */ |
| 2053 | p += emit_mov_addr (p, x0, lockaddr); |
| 2054 | p += emit_stlr (p, xzr, x0); |
| 2055 | |
| 2056 | /* Free collecting_t object: |
| 2057 | |
| 2058 | ADD sp, sp, #16 |
| 2059 | |
| 2060 | */ |
| 2061 | p += emit_add (p, sp, sp, immediate_operand (16)); |
| 2062 | |
| 2063 | /* Restore CPSR (NZCV), FPSR and FPCR. And free all special purpose |
| 2064 | registers from the stack. |
| 2065 | |
| 2066 | LDR x2, [sp, #(2 * 16)] |
| 2067 | LDR x1, [sp, #(1 * 16)] |
| 2068 | LDR x0, [sp, #(0 * 16)] |
| 2069 | |
| 2070 | MSR NZCV, x2 |
| 2071 | MSR FPSR, x1 |
| 2072 | MSR FPCR, x0 |
| 2073 | |
| 2074 | ADD sp, sp #(5 * 16) |
| 2075 | |
| 2076 | */ |
| 2077 | p += emit_ldr (p, x2, sp, offset_memory_operand (2 * 16)); |
| 2078 | p += emit_ldr (p, x1, sp, offset_memory_operand (1 * 16)); |
| 2079 | p += emit_ldr (p, x0, sp, offset_memory_operand (0 * 16)); |
| 2080 | p += emit_msr (p, NZCV, x2); |
| 2081 | p += emit_msr (p, FPSR, x1); |
| 2082 | p += emit_msr (p, FPCR, x0); |
| 2083 | |
| 2084 | p += emit_add (p, sp, sp, immediate_operand (5 * 16)); |
| 2085 | |
| 2086 | /* Pop general purpose registers: |
| 2087 | |
| 2088 | LDR x0, [sp] |
| 2089 | ... |
| 2090 | LDR x30, [sp, #(30 * 16)] |
| 2091 | |
| 2092 | ADD sp, sp, #(31 * 16) |
| 2093 | |
| 2094 | */ |
| 2095 | for (i = 0; i <= 30; i += 1) |
| 2096 | p += emit_ldr (p, aarch64_register (i, 1), sp, |
| 2097 | offset_memory_operand (i * 16)); |
| 2098 | p += emit_add (p, sp, sp, immediate_operand (31 * 16)); |
| 2099 | |
| 2100 | /* Pop SIMD&FP registers: |
| 2101 | |
| 2102 | LDP q0, q1, [sp] |
| 2103 | ... |
| 2104 | LDP q30, q31, [sp, #(30 * 16)] |
| 2105 | |
| 2106 | ADD sp, sp, #(32 * 16) |
| 2107 | |
| 2108 | */ |
| 2109 | for (i = 0; i <= 30; i += 2) |
| 2110 | p += emit_ldp_q_offset (p, i, i + 1, sp, i * 16); |
| 2111 | p += emit_add (p, sp, sp, immediate_operand (32 * 16)); |
| 2112 | |
| 2113 | /* Write the code into the inferior memory. */ |
| 2114 | append_insns (&buildaddr, p - buf, buf); |
| 2115 | |
| 2116 | /* Now emit the relocated instruction. */ |
| 2117 | *adjusted_insn_addr = buildaddr; |
| 2118 | target_read_uint32 (tpaddr, &insn); |
| 2119 | |
| 2120 | insn_data.base.insn_addr = tpaddr; |
| 2121 | insn_data.new_addr = buildaddr; |
| 2122 | insn_data.insn_ptr = buf; |
| 2123 | |
| 2124 | aarch64_relocate_instruction (insn, &visitor, |
| 2125 | (struct aarch64_insn_data *) &insn_data); |
| 2126 | |
| 2127 | /* We may not have been able to relocate the instruction. */ |
| 2128 | if (insn_data.insn_ptr == buf) |
| 2129 | { |
| 2130 | sprintf (err, |
| 2131 | "E.Could not relocate instruction from %s to %s.", |
| 2132 | core_addr_to_string_nz (tpaddr), |
| 2133 | core_addr_to_string_nz (buildaddr)); |
| 2134 | return 1; |
| 2135 | } |
| 2136 | else |
| 2137 | append_insns (&buildaddr, insn_data.insn_ptr - buf, buf); |
| 2138 | *adjusted_insn_addr_end = buildaddr; |
| 2139 | |
| 2140 | /* Go back to the start of the buffer. */ |
| 2141 | p = buf; |
| 2142 | |
| 2143 | /* Emit a branch back from the jump pad. */ |
| 2144 | offset = (tpaddr + orig_size - buildaddr); |
| 2145 | if (!can_encode_int32 (offset, 28)) |
| 2146 | { |
| 2147 | sprintf (err, |
| 2148 | "E.Jump back from jump pad too far from tracepoint " |
| 2149 | "(offset 0x%" PRIx32 " cannot be encoded in 28 bits).", |
| 2150 | offset); |
| 2151 | return 1; |
| 2152 | } |
| 2153 | |
| 2154 | p += emit_b (p, 0, offset); |
| 2155 | append_insns (&buildaddr, p - buf, buf); |
| 2156 | |
| 2157 | /* Give the caller a branch instruction into the jump pad. */ |
| 2158 | offset = (*jump_entry - tpaddr); |
| 2159 | if (!can_encode_int32 (offset, 28)) |
| 2160 | { |
| 2161 | sprintf (err, |
| 2162 | "E.Jump pad too far from tracepoint " |
| 2163 | "(offset 0x%" PRIx32 " cannot be encoded in 28 bits).", |
| 2164 | offset); |
| 2165 | return 1; |
| 2166 | } |
| 2167 | |
| 2168 | emit_b ((uint32_t *) jjump_pad_insn, 0, offset); |
| 2169 | *jjump_pad_insn_size = 4; |
| 2170 | |
| 2171 | /* Return the end address of our pad. */ |
| 2172 | *jump_entry = buildaddr; |
| 2173 | |
| 2174 | return 0; |
| 2175 | } |
| 2176 | |
| 2177 | /* Helper function writing LEN instructions from START into |
| 2178 | current_insn_ptr. */ |
| 2179 | |
| 2180 | static void |
| 2181 | emit_ops_insns (const uint32_t *start, int len) |
| 2182 | { |
| 2183 | CORE_ADDR buildaddr = current_insn_ptr; |
| 2184 | |
| 2185 | if (debug_threads) |
| 2186 | debug_printf ("Adding %d instrucions at %s\n", |
| 2187 | len, paddress (buildaddr)); |
| 2188 | |
| 2189 | append_insns (&buildaddr, len, start); |
| 2190 | current_insn_ptr = buildaddr; |
| 2191 | } |
| 2192 | |
| 2193 | /* Pop a register from the stack. */ |
| 2194 | |
| 2195 | static int |
| 2196 | emit_pop (uint32_t *buf, struct aarch64_register rt) |
| 2197 | { |
| 2198 | return emit_ldr (buf, rt, sp, postindex_memory_operand (1 * 16)); |
| 2199 | } |
| 2200 | |
| 2201 | /* Push a register on the stack. */ |
| 2202 | |
| 2203 | static int |
| 2204 | emit_push (uint32_t *buf, struct aarch64_register rt) |
| 2205 | { |
| 2206 | return emit_str (buf, rt, sp, preindex_memory_operand (-1 * 16)); |
| 2207 | } |
| 2208 | |
| 2209 | /* Implementation of emit_ops method "emit_prologue". */ |
| 2210 | |
| 2211 | static void |
| 2212 | aarch64_emit_prologue (void) |
| 2213 | { |
| 2214 | uint32_t buf[16]; |
| 2215 | uint32_t *p = buf; |
| 2216 | |
| 2217 | /* This function emit a prologue for the following function prototype: |
| 2218 | |
| 2219 | enum eval_result_type f (unsigned char *regs, |
| 2220 | ULONGEST *value); |
| 2221 | |
| 2222 | The first argument is a buffer of raw registers. The second |
| 2223 | argument is the result of |
| 2224 | evaluating the expression, which will be set to whatever is on top of |
| 2225 | the stack at the end. |
| 2226 | |
| 2227 | The stack set up by the prologue is as such: |
| 2228 | |
| 2229 | High *------------------------------------------------------* |
| 2230 | | LR | |
| 2231 | | FP | <- FP |
| 2232 | | x1 (ULONGEST *value) | |
| 2233 | | x0 (unsigned char *regs) | |
| 2234 | Low *------------------------------------------------------* |
| 2235 | |
| 2236 | As we are implementing a stack machine, each opcode can expand the |
| 2237 | stack so we never know how far we are from the data saved by this |
| 2238 | prologue. In order to be able refer to value and regs later, we save |
| 2239 | the current stack pointer in the frame pointer. This way, it is not |
| 2240 | clobbered when calling C functions. |
| 2241 | |
| 2242 | Finally, throughtout every operation, we are using register x0 as the |
| 2243 | top of the stack, and x1 as a scratch register. */ |
| 2244 | |
| 2245 | p += emit_stp (p, x0, x1, sp, preindex_memory_operand (-2 * 16)); |
| 2246 | p += emit_str (p, lr, sp, offset_memory_operand (3 * 8)); |
| 2247 | p += emit_str (p, fp, sp, offset_memory_operand (2 * 8)); |
| 2248 | |
| 2249 | p += emit_add (p, fp, sp, immediate_operand (2 * 8)); |
| 2250 | |
| 2251 | |
| 2252 | emit_ops_insns (buf, p - buf); |
| 2253 | } |
| 2254 | |
| 2255 | /* Implementation of emit_ops method "emit_epilogue". */ |
| 2256 | |
| 2257 | static void |
| 2258 | aarch64_emit_epilogue (void) |
| 2259 | { |
| 2260 | uint32_t buf[16]; |
| 2261 | uint32_t *p = buf; |
| 2262 | |
| 2263 | /* Store the result of the expression (x0) in *value. */ |
| 2264 | p += emit_sub (p, x1, fp, immediate_operand (1 * 8)); |
| 2265 | p += emit_ldr (p, x1, x1, offset_memory_operand (0)); |
| 2266 | p += emit_str (p, x0, x1, offset_memory_operand (0)); |
| 2267 | |
| 2268 | /* Restore the previous state. */ |
| 2269 | p += emit_add (p, sp, fp, immediate_operand (2 * 8)); |
| 2270 | p += emit_ldp (p, fp, lr, fp, offset_memory_operand (0)); |
| 2271 | |
| 2272 | /* Return expr_eval_no_error. */ |
| 2273 | p += emit_mov (p, x0, immediate_operand (expr_eval_no_error)); |
| 2274 | p += emit_ret (p, lr); |
| 2275 | |
| 2276 | emit_ops_insns (buf, p - buf); |
| 2277 | } |
| 2278 | |
| 2279 | /* Implementation of emit_ops method "emit_add". */ |
| 2280 | |
| 2281 | static void |
| 2282 | aarch64_emit_add (void) |
| 2283 | { |
| 2284 | uint32_t buf[16]; |
| 2285 | uint32_t *p = buf; |
| 2286 | |
| 2287 | p += emit_pop (p, x1); |
| 2288 | p += emit_add (p, x0, x0, register_operand (x1)); |
| 2289 | |
| 2290 | emit_ops_insns (buf, p - buf); |
| 2291 | } |
| 2292 | |
| 2293 | /* Implementation of emit_ops method "emit_sub". */ |
| 2294 | |
| 2295 | static void |
| 2296 | aarch64_emit_sub (void) |
| 2297 | { |
| 2298 | uint32_t buf[16]; |
| 2299 | uint32_t *p = buf; |
| 2300 | |
| 2301 | p += emit_pop (p, x1); |
| 2302 | p += emit_sub (p, x0, x0, register_operand (x1)); |
| 2303 | |
| 2304 | emit_ops_insns (buf, p - buf); |
| 2305 | } |
| 2306 | |
| 2307 | /* Implementation of emit_ops method "emit_mul". */ |
| 2308 | |
| 2309 | static void |
| 2310 | aarch64_emit_mul (void) |
| 2311 | { |
| 2312 | uint32_t buf[16]; |
| 2313 | uint32_t *p = buf; |
| 2314 | |
| 2315 | p += emit_pop (p, x1); |
| 2316 | p += emit_mul (p, x0, x1, x0); |
| 2317 | |
| 2318 | emit_ops_insns (buf, p - buf); |
| 2319 | } |
| 2320 | |
| 2321 | /* Implementation of emit_ops method "emit_lsh". */ |
| 2322 | |
| 2323 | static void |
| 2324 | aarch64_emit_lsh (void) |
| 2325 | { |
| 2326 | uint32_t buf[16]; |
| 2327 | uint32_t *p = buf; |
| 2328 | |
| 2329 | p += emit_pop (p, x1); |
| 2330 | p += emit_lslv (p, x0, x1, x0); |
| 2331 | |
| 2332 | emit_ops_insns (buf, p - buf); |
| 2333 | } |
| 2334 | |
| 2335 | /* Implementation of emit_ops method "emit_rsh_signed". */ |
| 2336 | |
| 2337 | static void |
| 2338 | aarch64_emit_rsh_signed (void) |
| 2339 | { |
| 2340 | uint32_t buf[16]; |
| 2341 | uint32_t *p = buf; |
| 2342 | |
| 2343 | p += emit_pop (p, x1); |
| 2344 | p += emit_asrv (p, x0, x1, x0); |
| 2345 | |
| 2346 | emit_ops_insns (buf, p - buf); |
| 2347 | } |
| 2348 | |
| 2349 | /* Implementation of emit_ops method "emit_rsh_unsigned". */ |
| 2350 | |
| 2351 | static void |
| 2352 | aarch64_emit_rsh_unsigned (void) |
| 2353 | { |
| 2354 | uint32_t buf[16]; |
| 2355 | uint32_t *p = buf; |
| 2356 | |
| 2357 | p += emit_pop (p, x1); |
| 2358 | p += emit_lsrv (p, x0, x1, x0); |
| 2359 | |
| 2360 | emit_ops_insns (buf, p - buf); |
| 2361 | } |
| 2362 | |
| 2363 | /* Implementation of emit_ops method "emit_ext". */ |
| 2364 | |
| 2365 | static void |
| 2366 | aarch64_emit_ext (int arg) |
| 2367 | { |
| 2368 | uint32_t buf[16]; |
| 2369 | uint32_t *p = buf; |
| 2370 | |
| 2371 | p += emit_sbfx (p, x0, x0, 0, arg); |
| 2372 | |
| 2373 | emit_ops_insns (buf, p - buf); |
| 2374 | } |
| 2375 | |
| 2376 | /* Implementation of emit_ops method "emit_log_not". */ |
| 2377 | |
| 2378 | static void |
| 2379 | aarch64_emit_log_not (void) |
| 2380 | { |
| 2381 | uint32_t buf[16]; |
| 2382 | uint32_t *p = buf; |
| 2383 | |
| 2384 | /* If the top of the stack is 0, replace it with 1. Else replace it with |
| 2385 | 0. */ |
| 2386 | |
| 2387 | p += emit_cmp (p, x0, immediate_operand (0)); |
| 2388 | p += emit_cset (p, x0, EQ); |
| 2389 | |
| 2390 | emit_ops_insns (buf, p - buf); |
| 2391 | } |
| 2392 | |
| 2393 | /* Implementation of emit_ops method "emit_bit_and". */ |
| 2394 | |
| 2395 | static void |
| 2396 | aarch64_emit_bit_and (void) |
| 2397 | { |
| 2398 | uint32_t buf[16]; |
| 2399 | uint32_t *p = buf; |
| 2400 | |
| 2401 | p += emit_pop (p, x1); |
| 2402 | p += emit_and (p, x0, x0, x1); |
| 2403 | |
| 2404 | emit_ops_insns (buf, p - buf); |
| 2405 | } |
| 2406 | |
| 2407 | /* Implementation of emit_ops method "emit_bit_or". */ |
| 2408 | |
| 2409 | static void |
| 2410 | aarch64_emit_bit_or (void) |
| 2411 | { |
| 2412 | uint32_t buf[16]; |
| 2413 | uint32_t *p = buf; |
| 2414 | |
| 2415 | p += emit_pop (p, x1); |
| 2416 | p += emit_orr (p, x0, x0, x1); |
| 2417 | |
| 2418 | emit_ops_insns (buf, p - buf); |
| 2419 | } |
| 2420 | |
| 2421 | /* Implementation of emit_ops method "emit_bit_xor". */ |
| 2422 | |
| 2423 | static void |
| 2424 | aarch64_emit_bit_xor (void) |
| 2425 | { |
| 2426 | uint32_t buf[16]; |
| 2427 | uint32_t *p = buf; |
| 2428 | |
| 2429 | p += emit_pop (p, x1); |
| 2430 | p += emit_eor (p, x0, x0, x1); |
| 2431 | |
| 2432 | emit_ops_insns (buf, p - buf); |
| 2433 | } |
| 2434 | |
| 2435 | /* Implementation of emit_ops method "emit_bit_not". */ |
| 2436 | |
| 2437 | static void |
| 2438 | aarch64_emit_bit_not (void) |
| 2439 | { |
| 2440 | uint32_t buf[16]; |
| 2441 | uint32_t *p = buf; |
| 2442 | |
| 2443 | p += emit_mvn (p, x0, x0); |
| 2444 | |
| 2445 | emit_ops_insns (buf, p - buf); |
| 2446 | } |
| 2447 | |
| 2448 | /* Implementation of emit_ops method "emit_equal". */ |
| 2449 | |
| 2450 | static void |
| 2451 | aarch64_emit_equal (void) |
| 2452 | { |
| 2453 | uint32_t buf[16]; |
| 2454 | uint32_t *p = buf; |
| 2455 | |
| 2456 | p += emit_pop (p, x1); |
| 2457 | p += emit_cmp (p, x0, register_operand (x1)); |
| 2458 | p += emit_cset (p, x0, EQ); |
| 2459 | |
| 2460 | emit_ops_insns (buf, p - buf); |
| 2461 | } |
| 2462 | |
| 2463 | /* Implementation of emit_ops method "emit_less_signed". */ |
| 2464 | |
| 2465 | static void |
| 2466 | aarch64_emit_less_signed (void) |
| 2467 | { |
| 2468 | uint32_t buf[16]; |
| 2469 | uint32_t *p = buf; |
| 2470 | |
| 2471 | p += emit_pop (p, x1); |
| 2472 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2473 | p += emit_cset (p, x0, LT); |
| 2474 | |
| 2475 | emit_ops_insns (buf, p - buf); |
| 2476 | } |
| 2477 | |
| 2478 | /* Implementation of emit_ops method "emit_less_unsigned". */ |
| 2479 | |
| 2480 | static void |
| 2481 | aarch64_emit_less_unsigned (void) |
| 2482 | { |
| 2483 | uint32_t buf[16]; |
| 2484 | uint32_t *p = buf; |
| 2485 | |
| 2486 | p += emit_pop (p, x1); |
| 2487 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2488 | p += emit_cset (p, x0, LO); |
| 2489 | |
| 2490 | emit_ops_insns (buf, p - buf); |
| 2491 | } |
| 2492 | |
| 2493 | /* Implementation of emit_ops method "emit_ref". */ |
| 2494 | |
| 2495 | static void |
| 2496 | aarch64_emit_ref (int size) |
| 2497 | { |
| 2498 | uint32_t buf[16]; |
| 2499 | uint32_t *p = buf; |
| 2500 | |
| 2501 | switch (size) |
| 2502 | { |
| 2503 | case 1: |
| 2504 | p += emit_ldrb (p, w0, x0, offset_memory_operand (0)); |
| 2505 | break; |
| 2506 | case 2: |
| 2507 | p += emit_ldrh (p, w0, x0, offset_memory_operand (0)); |
| 2508 | break; |
| 2509 | case 4: |
| 2510 | p += emit_ldr (p, w0, x0, offset_memory_operand (0)); |
| 2511 | break; |
| 2512 | case 8: |
| 2513 | p += emit_ldr (p, x0, x0, offset_memory_operand (0)); |
| 2514 | break; |
| 2515 | default: |
| 2516 | /* Unknown size, bail on compilation. */ |
| 2517 | emit_error = 1; |
| 2518 | break; |
| 2519 | } |
| 2520 | |
| 2521 | emit_ops_insns (buf, p - buf); |
| 2522 | } |
| 2523 | |
| 2524 | /* Implementation of emit_ops method "emit_if_goto". */ |
| 2525 | |
| 2526 | static void |
| 2527 | aarch64_emit_if_goto (int *offset_p, int *size_p) |
| 2528 | { |
| 2529 | uint32_t buf[16]; |
| 2530 | uint32_t *p = buf; |
| 2531 | |
| 2532 | /* The Z flag is set or cleared here. */ |
| 2533 | p += emit_cmp (p, x0, immediate_operand (0)); |
| 2534 | /* This instruction must not change the Z flag. */ |
| 2535 | p += emit_pop (p, x0); |
| 2536 | /* Branch over the next instruction if x0 == 0. */ |
| 2537 | p += emit_bcond (p, EQ, 8); |
| 2538 | |
| 2539 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2540 | if (offset_p) |
| 2541 | *offset_p = (p - buf) * 4; |
| 2542 | if (size_p) |
| 2543 | *size_p = 4; |
| 2544 | p += emit_nop (p); |
| 2545 | |
| 2546 | emit_ops_insns (buf, p - buf); |
| 2547 | } |
| 2548 | |
| 2549 | /* Implementation of emit_ops method "emit_goto". */ |
| 2550 | |
| 2551 | static void |
| 2552 | aarch64_emit_goto (int *offset_p, int *size_p) |
| 2553 | { |
| 2554 | uint32_t buf[16]; |
| 2555 | uint32_t *p = buf; |
| 2556 | |
| 2557 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2558 | if (offset_p) |
| 2559 | *offset_p = 0; |
| 2560 | if (size_p) |
| 2561 | *size_p = 4; |
| 2562 | p += emit_nop (p); |
| 2563 | |
| 2564 | emit_ops_insns (buf, p - buf); |
| 2565 | } |
| 2566 | |
| 2567 | /* Implementation of emit_ops method "write_goto_address". */ |
| 2568 | |
| 2569 | void |
| 2570 | aarch64_write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) |
| 2571 | { |
| 2572 | uint32_t insn; |
| 2573 | |
| 2574 | emit_b (&insn, 0, to - from); |
| 2575 | append_insns (&from, 1, &insn); |
| 2576 | } |
| 2577 | |
| 2578 | /* Implementation of emit_ops method "emit_const". */ |
| 2579 | |
| 2580 | static void |
| 2581 | aarch64_emit_const (LONGEST num) |
| 2582 | { |
| 2583 | uint32_t buf[16]; |
| 2584 | uint32_t *p = buf; |
| 2585 | |
| 2586 | p += emit_mov_addr (p, x0, num); |
| 2587 | |
| 2588 | emit_ops_insns (buf, p - buf); |
| 2589 | } |
| 2590 | |
| 2591 | /* Implementation of emit_ops method "emit_call". */ |
| 2592 | |
| 2593 | static void |
| 2594 | aarch64_emit_call (CORE_ADDR fn) |
| 2595 | { |
| 2596 | uint32_t buf[16]; |
| 2597 | uint32_t *p = buf; |
| 2598 | |
| 2599 | p += emit_mov_addr (p, ip0, fn); |
| 2600 | p += emit_blr (p, ip0); |
| 2601 | |
| 2602 | emit_ops_insns (buf, p - buf); |
| 2603 | } |
| 2604 | |
| 2605 | /* Implementation of emit_ops method "emit_reg". */ |
| 2606 | |
| 2607 | static void |
| 2608 | aarch64_emit_reg (int reg) |
| 2609 | { |
| 2610 | uint32_t buf[16]; |
| 2611 | uint32_t *p = buf; |
| 2612 | |
| 2613 | /* Set x0 to unsigned char *regs. */ |
| 2614 | p += emit_sub (p, x0, fp, immediate_operand (2 * 8)); |
| 2615 | p += emit_ldr (p, x0, x0, offset_memory_operand (0)); |
| 2616 | p += emit_mov (p, x1, immediate_operand (reg)); |
| 2617 | |
| 2618 | emit_ops_insns (buf, p - buf); |
| 2619 | |
| 2620 | aarch64_emit_call (get_raw_reg_func_addr ()); |
| 2621 | } |
| 2622 | |
| 2623 | /* Implementation of emit_ops method "emit_pop". */ |
| 2624 | |
| 2625 | static void |
| 2626 | aarch64_emit_pop (void) |
| 2627 | { |
| 2628 | uint32_t buf[16]; |
| 2629 | uint32_t *p = buf; |
| 2630 | |
| 2631 | p += emit_pop (p, x0); |
| 2632 | |
| 2633 | emit_ops_insns (buf, p - buf); |
| 2634 | } |
| 2635 | |
| 2636 | /* Implementation of emit_ops method "emit_stack_flush". */ |
| 2637 | |
| 2638 | static void |
| 2639 | aarch64_emit_stack_flush (void) |
| 2640 | { |
| 2641 | uint32_t buf[16]; |
| 2642 | uint32_t *p = buf; |
| 2643 | |
| 2644 | p += emit_push (p, x0); |
| 2645 | |
| 2646 | emit_ops_insns (buf, p - buf); |
| 2647 | } |
| 2648 | |
| 2649 | /* Implementation of emit_ops method "emit_zero_ext". */ |
| 2650 | |
| 2651 | static void |
| 2652 | aarch64_emit_zero_ext (int arg) |
| 2653 | { |
| 2654 | uint32_t buf[16]; |
| 2655 | uint32_t *p = buf; |
| 2656 | |
| 2657 | p += emit_ubfx (p, x0, x0, 0, arg); |
| 2658 | |
| 2659 | emit_ops_insns (buf, p - buf); |
| 2660 | } |
| 2661 | |
| 2662 | /* Implementation of emit_ops method "emit_swap". */ |
| 2663 | |
| 2664 | static void |
| 2665 | aarch64_emit_swap (void) |
| 2666 | { |
| 2667 | uint32_t buf[16]; |
| 2668 | uint32_t *p = buf; |
| 2669 | |
| 2670 | p += emit_ldr (p, x1, sp, offset_memory_operand (0 * 16)); |
| 2671 | p += emit_str (p, x0, sp, offset_memory_operand (0 * 16)); |
| 2672 | p += emit_mov (p, x0, register_operand (x1)); |
| 2673 | |
| 2674 | emit_ops_insns (buf, p - buf); |
| 2675 | } |
| 2676 | |
| 2677 | /* Implementation of emit_ops method "emit_stack_adjust". */ |
| 2678 | |
| 2679 | static void |
| 2680 | aarch64_emit_stack_adjust (int n) |
| 2681 | { |
| 2682 | /* This is not needed with our design. */ |
| 2683 | uint32_t buf[16]; |
| 2684 | uint32_t *p = buf; |
| 2685 | |
| 2686 | p += emit_add (p, sp, sp, immediate_operand (n * 16)); |
| 2687 | |
| 2688 | emit_ops_insns (buf, p - buf); |
| 2689 | } |
| 2690 | |
| 2691 | /* Implementation of emit_ops method "emit_int_call_1". */ |
| 2692 | |
| 2693 | static void |
| 2694 | aarch64_emit_int_call_1 (CORE_ADDR fn, int arg1) |
| 2695 | { |
| 2696 | uint32_t buf[16]; |
| 2697 | uint32_t *p = buf; |
| 2698 | |
| 2699 | p += emit_mov (p, x0, immediate_operand (arg1)); |
| 2700 | |
| 2701 | emit_ops_insns (buf, p - buf); |
| 2702 | |
| 2703 | aarch64_emit_call (fn); |
| 2704 | } |
| 2705 | |
| 2706 | /* Implementation of emit_ops method "emit_void_call_2". */ |
| 2707 | |
| 2708 | static void |
| 2709 | aarch64_emit_void_call_2 (CORE_ADDR fn, int arg1) |
| 2710 | { |
| 2711 | uint32_t buf[16]; |
| 2712 | uint32_t *p = buf; |
| 2713 | |
| 2714 | /* Push x0 on the stack. */ |
| 2715 | aarch64_emit_stack_flush (); |
| 2716 | |
| 2717 | /* Setup arguments for the function call: |
| 2718 | |
| 2719 | x0: arg1 |
| 2720 | x1: top of the stack |
| 2721 | |
| 2722 | MOV x1, x0 |
| 2723 | MOV x0, #arg1 */ |
| 2724 | |
| 2725 | p += emit_mov (p, x1, register_operand (x0)); |
| 2726 | p += emit_mov (p, x0, immediate_operand (arg1)); |
| 2727 | |
| 2728 | emit_ops_insns (buf, p - buf); |
| 2729 | |
| 2730 | aarch64_emit_call (fn); |
| 2731 | |
| 2732 | /* Restore x0. */ |
| 2733 | aarch64_emit_pop (); |
| 2734 | } |
| 2735 | |
| 2736 | /* Implementation of emit_ops method "emit_eq_goto". */ |
| 2737 | |
| 2738 | static void |
| 2739 | aarch64_emit_eq_goto (int *offset_p, int *size_p) |
| 2740 | { |
| 2741 | uint32_t buf[16]; |
| 2742 | uint32_t *p = buf; |
| 2743 | |
| 2744 | p += emit_pop (p, x1); |
| 2745 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2746 | /* Branch over the next instruction if x0 != x1. */ |
| 2747 | p += emit_bcond (p, NE, 8); |
| 2748 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2749 | if (offset_p) |
| 2750 | *offset_p = (p - buf) * 4; |
| 2751 | if (size_p) |
| 2752 | *size_p = 4; |
| 2753 | p += emit_nop (p); |
| 2754 | |
| 2755 | emit_ops_insns (buf, p - buf); |
| 2756 | } |
| 2757 | |
| 2758 | /* Implementation of emit_ops method "emit_ne_goto". */ |
| 2759 | |
| 2760 | static void |
| 2761 | aarch64_emit_ne_goto (int *offset_p, int *size_p) |
| 2762 | { |
| 2763 | uint32_t buf[16]; |
| 2764 | uint32_t *p = buf; |
| 2765 | |
| 2766 | p += emit_pop (p, x1); |
| 2767 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2768 | /* Branch over the next instruction if x0 == x1. */ |
| 2769 | p += emit_bcond (p, EQ, 8); |
| 2770 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2771 | if (offset_p) |
| 2772 | *offset_p = (p - buf) * 4; |
| 2773 | if (size_p) |
| 2774 | *size_p = 4; |
| 2775 | p += emit_nop (p); |
| 2776 | |
| 2777 | emit_ops_insns (buf, p - buf); |
| 2778 | } |
| 2779 | |
| 2780 | /* Implementation of emit_ops method "emit_lt_goto". */ |
| 2781 | |
| 2782 | static void |
| 2783 | aarch64_emit_lt_goto (int *offset_p, int *size_p) |
| 2784 | { |
| 2785 | uint32_t buf[16]; |
| 2786 | uint32_t *p = buf; |
| 2787 | |
| 2788 | p += emit_pop (p, x1); |
| 2789 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2790 | /* Branch over the next instruction if x0 >= x1. */ |
| 2791 | p += emit_bcond (p, GE, 8); |
| 2792 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2793 | if (offset_p) |
| 2794 | *offset_p = (p - buf) * 4; |
| 2795 | if (size_p) |
| 2796 | *size_p = 4; |
| 2797 | p += emit_nop (p); |
| 2798 | |
| 2799 | emit_ops_insns (buf, p - buf); |
| 2800 | } |
| 2801 | |
| 2802 | /* Implementation of emit_ops method "emit_le_goto". */ |
| 2803 | |
| 2804 | static void |
| 2805 | aarch64_emit_le_goto (int *offset_p, int *size_p) |
| 2806 | { |
| 2807 | uint32_t buf[16]; |
| 2808 | uint32_t *p = buf; |
| 2809 | |
| 2810 | p += emit_pop (p, x1); |
| 2811 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2812 | /* Branch over the next instruction if x0 > x1. */ |
| 2813 | p += emit_bcond (p, GT, 8); |
| 2814 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2815 | if (offset_p) |
| 2816 | *offset_p = (p - buf) * 4; |
| 2817 | if (size_p) |
| 2818 | *size_p = 4; |
| 2819 | p += emit_nop (p); |
| 2820 | |
| 2821 | emit_ops_insns (buf, p - buf); |
| 2822 | } |
| 2823 | |
| 2824 | /* Implementation of emit_ops method "emit_gt_goto". */ |
| 2825 | |
| 2826 | static void |
| 2827 | aarch64_emit_gt_goto (int *offset_p, int *size_p) |
| 2828 | { |
| 2829 | uint32_t buf[16]; |
| 2830 | uint32_t *p = buf; |
| 2831 | |
| 2832 | p += emit_pop (p, x1); |
| 2833 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2834 | /* Branch over the next instruction if x0 <= x1. */ |
| 2835 | p += emit_bcond (p, LE, 8); |
| 2836 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2837 | if (offset_p) |
| 2838 | *offset_p = (p - buf) * 4; |
| 2839 | if (size_p) |
| 2840 | *size_p = 4; |
| 2841 | p += emit_nop (p); |
| 2842 | |
| 2843 | emit_ops_insns (buf, p - buf); |
| 2844 | } |
| 2845 | |
| 2846 | /* Implementation of emit_ops method "emit_ge_got". */ |
| 2847 | |
| 2848 | static void |
| 2849 | aarch64_emit_ge_got (int *offset_p, int *size_p) |
| 2850 | { |
| 2851 | uint32_t buf[16]; |
| 2852 | uint32_t *p = buf; |
| 2853 | |
| 2854 | p += emit_pop (p, x1); |
| 2855 | p += emit_cmp (p, x1, register_operand (x0)); |
| 2856 | /* Branch over the next instruction if x0 <= x1. */ |
| 2857 | p += emit_bcond (p, LT, 8); |
| 2858 | /* The NOP instruction will be patched with an unconditional branch. */ |
| 2859 | if (offset_p) |
| 2860 | *offset_p = (p - buf) * 4; |
| 2861 | if (size_p) |
| 2862 | *size_p = 4; |
| 2863 | p += emit_nop (p); |
| 2864 | |
| 2865 | emit_ops_insns (buf, p - buf); |
| 2866 | } |
| 2867 | |
| 2868 | static struct emit_ops aarch64_emit_ops_impl = |
| 2869 | { |
| 2870 | aarch64_emit_prologue, |
| 2871 | aarch64_emit_epilogue, |
| 2872 | aarch64_emit_add, |
| 2873 | aarch64_emit_sub, |
| 2874 | aarch64_emit_mul, |
| 2875 | aarch64_emit_lsh, |
| 2876 | aarch64_emit_rsh_signed, |
| 2877 | aarch64_emit_rsh_unsigned, |
| 2878 | aarch64_emit_ext, |
| 2879 | aarch64_emit_log_not, |
| 2880 | aarch64_emit_bit_and, |
| 2881 | aarch64_emit_bit_or, |
| 2882 | aarch64_emit_bit_xor, |
| 2883 | aarch64_emit_bit_not, |
| 2884 | aarch64_emit_equal, |
| 2885 | aarch64_emit_less_signed, |
| 2886 | aarch64_emit_less_unsigned, |
| 2887 | aarch64_emit_ref, |
| 2888 | aarch64_emit_if_goto, |
| 2889 | aarch64_emit_goto, |
| 2890 | aarch64_write_goto_address, |
| 2891 | aarch64_emit_const, |
| 2892 | aarch64_emit_call, |
| 2893 | aarch64_emit_reg, |
| 2894 | aarch64_emit_pop, |
| 2895 | aarch64_emit_stack_flush, |
| 2896 | aarch64_emit_zero_ext, |
| 2897 | aarch64_emit_swap, |
| 2898 | aarch64_emit_stack_adjust, |
| 2899 | aarch64_emit_int_call_1, |
| 2900 | aarch64_emit_void_call_2, |
| 2901 | aarch64_emit_eq_goto, |
| 2902 | aarch64_emit_ne_goto, |
| 2903 | aarch64_emit_lt_goto, |
| 2904 | aarch64_emit_le_goto, |
| 2905 | aarch64_emit_gt_goto, |
| 2906 | aarch64_emit_ge_got, |
| 2907 | }; |
| 2908 | |
| 2909 | /* Implementation of linux_target_ops method "emit_ops". */ |
| 2910 | |
| 2911 | static struct emit_ops * |
| 2912 | aarch64_emit_ops (void) |
| 2913 | { |
| 2914 | return &aarch64_emit_ops_impl; |
| 2915 | } |
| 2916 | |
| 2917 | /* Implementation of linux_target_ops method |
| 2918 | "get_min_fast_tracepoint_insn_len". */ |
| 2919 | |
| 2920 | static int |
| 2921 | aarch64_get_min_fast_tracepoint_insn_len (void) |
| 2922 | { |
| 2923 | return 4; |
| 2924 | } |
| 2925 | |
| 2926 | /* Implementation of linux_target_ops method "supports_range_stepping". */ |
| 2927 | |
| 2928 | static int |
| 2929 | aarch64_supports_range_stepping (void) |
| 2930 | { |
| 2931 | return 1; |
| 2932 | } |
| 2933 | |
| 2934 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
| 2935 | |
| 2936 | static const gdb_byte * |
| 2937 | aarch64_sw_breakpoint_from_kind (int kind, int *size) |
| 2938 | { |
| 2939 | *size = aarch64_breakpoint_len; |
| 2940 | return aarch64_breakpoint; |
| 2941 | } |
| 2942 | |
| 2943 | struct linux_target_ops the_low_target = |
| 2944 | { |
| 2945 | aarch64_arch_setup, |
| 2946 | aarch64_regs_info, |
| 2947 | aarch64_cannot_fetch_register, |
| 2948 | aarch64_cannot_store_register, |
| 2949 | NULL, /* fetch_register */ |
| 2950 | aarch64_get_pc, |
| 2951 | aarch64_set_pc, |
| 2952 | NULL, /* breakpoint_kind_from_pc */ |
| 2953 | aarch64_sw_breakpoint_from_kind, |
| 2954 | NULL, /* breakpoint_reinsert_addr */ |
| 2955 | 0, /* decr_pc_after_break */ |
| 2956 | aarch64_breakpoint_at, |
| 2957 | aarch64_supports_z_point_type, |
| 2958 | aarch64_insert_point, |
| 2959 | aarch64_remove_point, |
| 2960 | aarch64_stopped_by_watchpoint, |
| 2961 | aarch64_stopped_data_address, |
| 2962 | NULL, /* collect_ptrace_register */ |
| 2963 | NULL, /* supply_ptrace_register */ |
| 2964 | aarch64_linux_siginfo_fixup, |
| 2965 | aarch64_linux_new_process, |
| 2966 | aarch64_linux_new_thread, |
| 2967 | aarch64_linux_new_fork, |
| 2968 | aarch64_linux_prepare_to_resume, |
| 2969 | NULL, /* process_qsupported */ |
| 2970 | aarch64_supports_tracepoints, |
| 2971 | aarch64_get_thread_area, |
| 2972 | aarch64_install_fast_tracepoint_jump_pad, |
| 2973 | aarch64_emit_ops, |
| 2974 | aarch64_get_min_fast_tracepoint_insn_len, |
| 2975 | aarch64_supports_range_stepping, |
| 2976 | }; |
| 2977 | |
| 2978 | void |
| 2979 | initialize_low_arch (void) |
| 2980 | { |
| 2981 | init_registers_aarch64 (); |
| 2982 | |
| 2983 | initialize_low_arch_aarch32 (); |
| 2984 | |
| 2985 | initialize_regsets_info (&aarch64_regsets_info); |
| 2986 | } |