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176eb98c MS |
1 | /* GNU/Linux/AArch64 specific low level interface, for the remote server for |
2 | GDB. | |
3 | ||
618f726f | 4 | Copyright (C) 2009-2016 Free Software Foundation, Inc. |
176eb98c MS |
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" | |
db3cb7cb | 24 | #include "nat/aarch64-linux.h" |
554717a3 | 25 | #include "nat/aarch64-linux-hw-point.h" |
bb903df0 | 26 | #include "arch/aarch64-insn.h" |
3b53ae99 | 27 | #include "linux-aarch32-low.h" |
176eb98c | 28 | #include "elf/common.h" |
afbe19f8 PL |
29 | #include "ax.h" |
30 | #include "tracepoint.h" | |
176eb98c MS |
31 | |
32 | #include <signal.h> | |
33 | #include <sys/user.h> | |
5826e159 | 34 | #include "nat/gdb_ptrace.h" |
e9dae05e | 35 | #include <asm/ptrace.h> |
bb903df0 PL |
36 | #include <inttypes.h> |
37 | #include <endian.h> | |
38 | #include <sys/uio.h> | |
176eb98c MS |
39 | |
40 | #include "gdb_proc_service.h" | |
41 | ||
42 | /* Defined in auto-generated files. */ | |
43 | void init_registers_aarch64 (void); | |
3aee8918 | 44 | extern const struct target_desc *tdesc_aarch64; |
176eb98c | 45 | |
176eb98c MS |
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 | |
bf330350 CU |
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) | |
176eb98c | 59 | |
bf330350 | 60 | #define AARCH64_NUM_REGS (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM + 2) |
176eb98c | 61 | |
176eb98c MS |
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 | ||
3b53ae99 YQ |
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 | ||
421530db PL |
89 | /* Implementation of linux_target_ops method "cannot_store_register". */ |
90 | ||
176eb98c MS |
91 | static int |
92 | aarch64_cannot_store_register (int regno) | |
93 | { | |
94 | return regno >= AARCH64_NUM_REGS; | |
95 | } | |
96 | ||
421530db PL |
97 | /* Implementation of linux_target_ops method "cannot_fetch_register". */ |
98 | ||
176eb98c MS |
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 | { | |
6a69a054 | 108 | struct user_pt_regs *regset = (struct user_pt_regs *) buf; |
176eb98c MS |
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 | { | |
6a69a054 | 121 | const struct user_pt_regs *regset = (const struct user_pt_regs *) buf; |
176eb98c MS |
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 | { | |
9caa3311 | 134 | struct user_fpsimd_state *regset = (struct user_fpsimd_state *) buf; |
176eb98c MS |
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]); | |
bf330350 CU |
139 | collect_register (regcache, AARCH64_FPSR_REGNO, ®set->fpsr); |
140 | collect_register (regcache, AARCH64_FPCR_REGNO, ®set->fpcr); | |
176eb98c MS |
141 | } |
142 | ||
143 | static void | |
144 | aarch64_store_fpregset (struct regcache *regcache, const void *buf) | |
145 | { | |
9caa3311 YQ |
146 | const struct user_fpsimd_state *regset |
147 | = (const struct user_fpsimd_state *) buf; | |
176eb98c MS |
148 | int i; |
149 | ||
150 | for (i = 0; i < AARCH64_V_REGS_NUM; i++) | |
151 | supply_register (regcache, AARCH64_V0_REGNO + i, ®set->vregs[i]); | |
bf330350 CU |
152 | supply_register (regcache, AARCH64_FPSR_REGNO, ®set->fpsr); |
153 | supply_register (regcache, AARCH64_FPCR_REGNO, ®set->fpcr); | |
176eb98c MS |
154 | } |
155 | ||
176eb98c MS |
156 | /* Enable miscellaneous debugging output. The name is historical - it |
157 | was originally used to debug LinuxThreads support. */ | |
158 | extern int debug_threads; | |
159 | ||
421530db PL |
160 | /* Implementation of linux_target_ops method "get_pc". */ |
161 | ||
176eb98c MS |
162 | static CORE_ADDR |
163 | aarch64_get_pc (struct regcache *regcache) | |
164 | { | |
8a7e4587 | 165 | if (register_size (regcache->tdesc, 0) == 8) |
a5652c21 | 166 | return linux_get_pc_64bit (regcache); |
8a7e4587 | 167 | else |
a5652c21 | 168 | return linux_get_pc_32bit (regcache); |
176eb98c MS |
169 | } |
170 | ||
421530db PL |
171 | /* Implementation of linux_target_ops method "set_pc". */ |
172 | ||
176eb98c MS |
173 | static void |
174 | aarch64_set_pc (struct regcache *regcache, CORE_ADDR pc) | |
175 | { | |
8a7e4587 | 176 | if (register_size (regcache->tdesc, 0) == 8) |
a5652c21 | 177 | linux_set_pc_64bit (regcache, pc); |
8a7e4587 | 178 | else |
a5652c21 | 179 | linux_set_pc_32bit (regcache, pc); |
176eb98c MS |
180 | } |
181 | ||
176eb98c MS |
182 | #define aarch64_breakpoint_len 4 |
183 | ||
37d66942 PL |
184 | /* AArch64 BRK software debug mode instruction. |
185 | This instruction needs to match gdb/aarch64-tdep.c | |
186 | (aarch64_default_breakpoint). */ | |
187 | static const gdb_byte aarch64_breakpoint[] = {0x00, 0x00, 0x20, 0xd4}; | |
176eb98c | 188 | |
421530db PL |
189 | /* Implementation of linux_target_ops method "breakpoint_at". */ |
190 | ||
176eb98c MS |
191 | static int |
192 | aarch64_breakpoint_at (CORE_ADDR where) | |
193 | { | |
db91f502 YQ |
194 | if (is_64bit_tdesc ()) |
195 | { | |
196 | gdb_byte insn[aarch64_breakpoint_len]; | |
176eb98c | 197 | |
db91f502 YQ |
198 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
199 | aarch64_breakpoint_len); | |
200 | if (memcmp (insn, aarch64_breakpoint, aarch64_breakpoint_len) == 0) | |
201 | return 1; | |
176eb98c | 202 | |
db91f502 YQ |
203 | return 0; |
204 | } | |
205 | else | |
206 | return arm_breakpoint_at (where); | |
176eb98c MS |
207 | } |
208 | ||
176eb98c MS |
209 | static void |
210 | aarch64_init_debug_reg_state (struct aarch64_debug_reg_state *state) | |
211 | { | |
212 | int i; | |
213 | ||
214 | for (i = 0; i < AARCH64_HBP_MAX_NUM; ++i) | |
215 | { | |
216 | state->dr_addr_bp[i] = 0; | |
217 | state->dr_ctrl_bp[i] = 0; | |
218 | state->dr_ref_count_bp[i] = 0; | |
219 | } | |
220 | ||
221 | for (i = 0; i < AARCH64_HWP_MAX_NUM; ++i) | |
222 | { | |
223 | state->dr_addr_wp[i] = 0; | |
224 | state->dr_ctrl_wp[i] = 0; | |
225 | state->dr_ref_count_wp[i] = 0; | |
226 | } | |
227 | } | |
228 | ||
176eb98c MS |
229 | /* Return the pointer to the debug register state structure in the |
230 | current process' arch-specific data area. */ | |
231 | ||
db3cb7cb | 232 | struct aarch64_debug_reg_state * |
88e2cf7e | 233 | aarch64_get_debug_reg_state (pid_t pid) |
176eb98c | 234 | { |
88e2cf7e | 235 | struct process_info *proc = find_process_pid (pid); |
176eb98c | 236 | |
fe978cb0 | 237 | return &proc->priv->arch_private->debug_reg_state; |
176eb98c MS |
238 | } |
239 | ||
421530db PL |
240 | /* Implementation of linux_target_ops method "supports_z_point_type". */ |
241 | ||
4ff0d3d8 PA |
242 | static int |
243 | aarch64_supports_z_point_type (char z_type) | |
244 | { | |
245 | switch (z_type) | |
246 | { | |
96c97461 | 247 | case Z_PACKET_SW_BP: |
4ff0d3d8 PA |
248 | case Z_PACKET_HW_BP: |
249 | case Z_PACKET_WRITE_WP: | |
250 | case Z_PACKET_READ_WP: | |
251 | case Z_PACKET_ACCESS_WP: | |
252 | return 1; | |
253 | default: | |
4ff0d3d8 PA |
254 | return 0; |
255 | } | |
256 | } | |
257 | ||
421530db | 258 | /* Implementation of linux_target_ops method "insert_point". |
176eb98c | 259 | |
421530db PL |
260 | It actually only records the info of the to-be-inserted bp/wp; |
261 | the actual insertion will happen when threads are resumed. */ | |
176eb98c MS |
262 | |
263 | static int | |
802e8e6d PA |
264 | aarch64_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
265 | int len, struct raw_breakpoint *bp) | |
176eb98c MS |
266 | { |
267 | int ret; | |
4ff0d3d8 | 268 | enum target_hw_bp_type targ_type; |
88e2cf7e YQ |
269 | struct aarch64_debug_reg_state *state |
270 | = aarch64_get_debug_reg_state (pid_of (current_thread)); | |
4ff0d3d8 | 271 | |
c5e92cca | 272 | if (show_debug_regs) |
176eb98c MS |
273 | fprintf (stderr, "insert_point on entry (addr=0x%08lx, len=%d)\n", |
274 | (unsigned long) addr, len); | |
275 | ||
802e8e6d PA |
276 | /* Determine the type from the raw breakpoint type. */ |
277 | targ_type = raw_bkpt_type_to_target_hw_bp_type (type); | |
176eb98c MS |
278 | |
279 | if (targ_type != hw_execute) | |
39edd165 YQ |
280 | { |
281 | if (aarch64_linux_region_ok_for_watchpoint (addr, len)) | |
282 | ret = aarch64_handle_watchpoint (targ_type, addr, len, | |
283 | 1 /* is_insert */, state); | |
284 | else | |
285 | ret = -1; | |
286 | } | |
176eb98c | 287 | else |
8d689ee5 YQ |
288 | { |
289 | if (len == 3) | |
290 | { | |
291 | /* LEN is 3 means the breakpoint is set on a 32-bit thumb | |
292 | instruction. Set it to 2 to correctly encode length bit | |
293 | mask in hardware/watchpoint control register. */ | |
294 | len = 2; | |
295 | } | |
296 | ret = aarch64_handle_breakpoint (targ_type, addr, len, | |
297 | 1 /* is_insert */, state); | |
298 | } | |
176eb98c | 299 | |
60a191ed | 300 | if (show_debug_regs) |
88e2cf7e YQ |
301 | aarch64_show_debug_reg_state (state, "insert_point", addr, len, |
302 | targ_type); | |
176eb98c MS |
303 | |
304 | return ret; | |
305 | } | |
306 | ||
421530db | 307 | /* Implementation of linux_target_ops method "remove_point". |
176eb98c | 308 | |
421530db PL |
309 | It actually only records the info of the to-be-removed bp/wp, |
310 | the actual removal will be done when threads are resumed. */ | |
176eb98c MS |
311 | |
312 | static int | |
802e8e6d PA |
313 | aarch64_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
314 | int len, struct raw_breakpoint *bp) | |
176eb98c MS |
315 | { |
316 | int ret; | |
4ff0d3d8 | 317 | enum target_hw_bp_type targ_type; |
88e2cf7e YQ |
318 | struct aarch64_debug_reg_state *state |
319 | = aarch64_get_debug_reg_state (pid_of (current_thread)); | |
4ff0d3d8 | 320 | |
c5e92cca | 321 | if (show_debug_regs) |
176eb98c MS |
322 | fprintf (stderr, "remove_point on entry (addr=0x%08lx, len=%d)\n", |
323 | (unsigned long) addr, len); | |
324 | ||
802e8e6d PA |
325 | /* Determine the type from the raw breakpoint type. */ |
326 | targ_type = raw_bkpt_type_to_target_hw_bp_type (type); | |
176eb98c MS |
327 | |
328 | /* Set up state pointers. */ | |
329 | if (targ_type != hw_execute) | |
330 | ret = | |
c67ca4de YQ |
331 | aarch64_handle_watchpoint (targ_type, addr, len, 0 /* is_insert */, |
332 | state); | |
176eb98c | 333 | else |
8d689ee5 YQ |
334 | { |
335 | if (len == 3) | |
336 | { | |
337 | /* LEN is 3 means the breakpoint is set on a 32-bit thumb | |
338 | instruction. Set it to 2 to correctly encode length bit | |
339 | mask in hardware/watchpoint control register. */ | |
340 | len = 2; | |
341 | } | |
342 | ret = aarch64_handle_breakpoint (targ_type, addr, len, | |
343 | 0 /* is_insert */, state); | |
344 | } | |
176eb98c | 345 | |
60a191ed | 346 | if (show_debug_regs) |
88e2cf7e YQ |
347 | aarch64_show_debug_reg_state (state, "remove_point", addr, len, |
348 | targ_type); | |
176eb98c MS |
349 | |
350 | return ret; | |
351 | } | |
352 | ||
421530db | 353 | /* Implementation of linux_target_ops method "stopped_data_address". */ |
176eb98c MS |
354 | |
355 | static CORE_ADDR | |
356 | aarch64_stopped_data_address (void) | |
357 | { | |
358 | siginfo_t siginfo; | |
359 | int pid, i; | |
360 | struct aarch64_debug_reg_state *state; | |
361 | ||
0bfdf32f | 362 | pid = lwpid_of (current_thread); |
176eb98c MS |
363 | |
364 | /* Get the siginfo. */ | |
365 | if (ptrace (PTRACE_GETSIGINFO, pid, NULL, &siginfo) != 0) | |
366 | return (CORE_ADDR) 0; | |
367 | ||
368 | /* Need to be a hardware breakpoint/watchpoint trap. */ | |
369 | if (siginfo.si_signo != SIGTRAP | |
370 | || (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */) | |
371 | return (CORE_ADDR) 0; | |
372 | ||
373 | /* Check if the address matches any watched address. */ | |
88e2cf7e | 374 | state = aarch64_get_debug_reg_state (pid_of (current_thread)); |
176eb98c MS |
375 | for (i = aarch64_num_wp_regs - 1; i >= 0; --i) |
376 | { | |
377 | const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]); | |
378 | const CORE_ADDR addr_trap = (CORE_ADDR) siginfo.si_addr; | |
379 | const CORE_ADDR addr_watch = state->dr_addr_wp[i]; | |
380 | if (state->dr_ref_count_wp[i] | |
381 | && DR_CONTROL_ENABLED (state->dr_ctrl_wp[i]) | |
382 | && addr_trap >= addr_watch | |
383 | && addr_trap < addr_watch + len) | |
384 | return addr_trap; | |
385 | } | |
386 | ||
387 | return (CORE_ADDR) 0; | |
388 | } | |
389 | ||
421530db | 390 | /* Implementation of linux_target_ops method "stopped_by_watchpoint". */ |
176eb98c MS |
391 | |
392 | static int | |
393 | aarch64_stopped_by_watchpoint (void) | |
394 | { | |
395 | if (aarch64_stopped_data_address () != 0) | |
396 | return 1; | |
397 | else | |
398 | return 0; | |
399 | } | |
400 | ||
401 | /* Fetch the thread-local storage pointer for libthread_db. */ | |
402 | ||
403 | ps_err_e | |
754653a7 | 404 | ps_get_thread_area (struct ps_prochandle *ph, |
176eb98c MS |
405 | lwpid_t lwpid, int idx, void **base) |
406 | { | |
a0cc84cd YQ |
407 | return aarch64_ps_get_thread_area (ph, lwpid, idx, base, |
408 | is_64bit_tdesc ()); | |
176eb98c MS |
409 | } |
410 | ||
ade90bde YQ |
411 | /* Implementation of linux_target_ops method "siginfo_fixup". */ |
412 | ||
413 | static int | |
8adce034 | 414 | aarch64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) |
ade90bde YQ |
415 | { |
416 | /* Is the inferior 32-bit? If so, then fixup the siginfo object. */ | |
417 | if (!is_64bit_tdesc ()) | |
418 | { | |
419 | if (direction == 0) | |
420 | aarch64_compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, | |
421 | native); | |
422 | else | |
423 | aarch64_siginfo_from_compat_siginfo (native, | |
424 | (struct compat_siginfo *) inf); | |
425 | ||
426 | return 1; | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
421530db | 432 | /* Implementation of linux_target_ops method "linux_new_process". */ |
176eb98c MS |
433 | |
434 | static struct arch_process_info * | |
435 | aarch64_linux_new_process (void) | |
436 | { | |
8d749320 | 437 | struct arch_process_info *info = XCNEW (struct arch_process_info); |
176eb98c MS |
438 | |
439 | aarch64_init_debug_reg_state (&info->debug_reg_state); | |
440 | ||
441 | return info; | |
442 | } | |
443 | ||
421530db PL |
444 | /* Implementation of linux_target_ops method "linux_new_fork". */ |
445 | ||
3a8a0396 DB |
446 | static void |
447 | aarch64_linux_new_fork (struct process_info *parent, | |
448 | struct process_info *child) | |
449 | { | |
450 | /* These are allocated by linux_add_process. */ | |
61a7418c DB |
451 | gdb_assert (parent->priv != NULL |
452 | && parent->priv->arch_private != NULL); | |
453 | gdb_assert (child->priv != NULL | |
454 | && child->priv->arch_private != NULL); | |
3a8a0396 DB |
455 | |
456 | /* Linux kernel before 2.6.33 commit | |
457 | 72f674d203cd230426437cdcf7dd6f681dad8b0d | |
458 | will inherit hardware debug registers from parent | |
459 | on fork/vfork/clone. Newer Linux kernels create such tasks with | |
460 | zeroed debug registers. | |
461 | ||
462 | GDB core assumes the child inherits the watchpoints/hw | |
463 | breakpoints of the parent, and will remove them all from the | |
464 | forked off process. Copy the debug registers mirrors into the | |
465 | new process so that all breakpoints and watchpoints can be | |
466 | removed together. The debug registers mirror will become zeroed | |
467 | in the end before detaching the forked off process, thus making | |
468 | this compatible with older Linux kernels too. */ | |
469 | ||
61a7418c | 470 | *child->priv->arch_private = *parent->priv->arch_private; |
3a8a0396 DB |
471 | } |
472 | ||
3b53ae99 YQ |
473 | /* Return the right target description according to the ELF file of |
474 | current thread. */ | |
475 | ||
476 | static const struct target_desc * | |
477 | aarch64_linux_read_description (void) | |
478 | { | |
479 | unsigned int machine; | |
480 | int is_elf64; | |
481 | int tid; | |
482 | ||
483 | tid = lwpid_of (current_thread); | |
484 | ||
485 | is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine); | |
486 | ||
487 | if (is_elf64) | |
488 | return tdesc_aarch64; | |
489 | else | |
490 | return tdesc_arm_with_neon; | |
491 | } | |
492 | ||
421530db PL |
493 | /* Implementation of linux_target_ops method "arch_setup". */ |
494 | ||
176eb98c MS |
495 | static void |
496 | aarch64_arch_setup (void) | |
497 | { | |
3b53ae99 | 498 | current_process ()->tdesc = aarch64_linux_read_description (); |
176eb98c | 499 | |
af1b22f3 | 500 | aarch64_linux_get_debug_reg_capacity (lwpid_of (current_thread)); |
176eb98c MS |
501 | } |
502 | ||
3aee8918 | 503 | static struct regset_info aarch64_regsets[] = |
176eb98c MS |
504 | { |
505 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, | |
506 | sizeof (struct user_pt_regs), GENERAL_REGS, | |
507 | aarch64_fill_gregset, aarch64_store_gregset }, | |
508 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, | |
509 | sizeof (struct user_fpsimd_state), FP_REGS, | |
510 | aarch64_fill_fpregset, aarch64_store_fpregset | |
511 | }, | |
50bc912a | 512 | NULL_REGSET |
176eb98c MS |
513 | }; |
514 | ||
3aee8918 PA |
515 | static struct regsets_info aarch64_regsets_info = |
516 | { | |
517 | aarch64_regsets, /* regsets */ | |
518 | 0, /* num_regsets */ | |
519 | NULL, /* disabled_regsets */ | |
520 | }; | |
521 | ||
3b53ae99 | 522 | static struct regs_info regs_info_aarch64 = |
3aee8918 PA |
523 | { |
524 | NULL, /* regset_bitmap */ | |
c2d65f38 | 525 | NULL, /* usrregs */ |
3aee8918 PA |
526 | &aarch64_regsets_info, |
527 | }; | |
528 | ||
421530db PL |
529 | /* Implementation of linux_target_ops method "regs_info". */ |
530 | ||
3aee8918 PA |
531 | static const struct regs_info * |
532 | aarch64_regs_info (void) | |
533 | { | |
3b53ae99 YQ |
534 | if (is_64bit_tdesc ()) |
535 | return ®s_info_aarch64; | |
536 | else | |
537 | return ®s_info_aarch32; | |
3aee8918 PA |
538 | } |
539 | ||
7671bf47 PL |
540 | /* Implementation of linux_target_ops method "supports_tracepoints". */ |
541 | ||
542 | static int | |
543 | aarch64_supports_tracepoints (void) | |
544 | { | |
524b57e6 YQ |
545 | if (current_thread == NULL) |
546 | return 1; | |
547 | else | |
548 | { | |
549 | /* We don't support tracepoints on aarch32 now. */ | |
550 | return is_64bit_tdesc (); | |
551 | } | |
7671bf47 PL |
552 | } |
553 | ||
bb903df0 PL |
554 | /* Implementation of linux_target_ops method "get_thread_area". */ |
555 | ||
556 | static int | |
557 | aarch64_get_thread_area (int lwpid, CORE_ADDR *addrp) | |
558 | { | |
559 | struct iovec iovec; | |
560 | uint64_t reg; | |
561 | ||
562 | iovec.iov_base = ® | |
563 | iovec.iov_len = sizeof (reg); | |
564 | ||
565 | if (ptrace (PTRACE_GETREGSET, lwpid, NT_ARM_TLS, &iovec) != 0) | |
566 | return -1; | |
567 | ||
568 | *addrp = reg; | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
061fc021 YQ |
573 | /* Implementation of linux_target_ops method "get_syscall_trapinfo". */ |
574 | ||
575 | static void | |
576 | aarch64_get_syscall_trapinfo (struct regcache *regcache, int *sysno) | |
577 | { | |
578 | int use_64bit = register_size (regcache->tdesc, 0) == 8; | |
579 | ||
580 | if (use_64bit) | |
581 | { | |
582 | long l_sysno; | |
583 | ||
584 | collect_register_by_name (regcache, "x8", &l_sysno); | |
585 | *sysno = (int) l_sysno; | |
586 | } | |
587 | else | |
588 | collect_register_by_name (regcache, "r7", sysno); | |
589 | } | |
590 | ||
afbe19f8 PL |
591 | /* List of condition codes that we need. */ |
592 | ||
593 | enum aarch64_condition_codes | |
594 | { | |
595 | EQ = 0x0, | |
596 | NE = 0x1, | |
597 | LO = 0x3, | |
598 | GE = 0xa, | |
599 | LT = 0xb, | |
600 | GT = 0xc, | |
601 | LE = 0xd, | |
bb903df0 PL |
602 | }; |
603 | ||
6c1c9a8b YQ |
604 | enum aarch64_operand_type |
605 | { | |
606 | OPERAND_IMMEDIATE, | |
607 | OPERAND_REGISTER, | |
608 | }; | |
609 | ||
bb903df0 PL |
610 | /* Representation of an operand. At this time, it only supports register |
611 | and immediate types. */ | |
612 | ||
613 | struct aarch64_operand | |
614 | { | |
615 | /* Type of the operand. */ | |
6c1c9a8b YQ |
616 | enum aarch64_operand_type type; |
617 | ||
bb903df0 PL |
618 | /* Value of the operand according to the type. */ |
619 | union | |
620 | { | |
621 | uint32_t imm; | |
622 | struct aarch64_register reg; | |
623 | }; | |
624 | }; | |
625 | ||
626 | /* List of registers that we are currently using, we can add more here as | |
627 | we need to use them. */ | |
628 | ||
629 | /* General purpose scratch registers (64 bit). */ | |
630 | static const struct aarch64_register x0 = { 0, 1 }; | |
631 | static const struct aarch64_register x1 = { 1, 1 }; | |
632 | static const struct aarch64_register x2 = { 2, 1 }; | |
633 | static const struct aarch64_register x3 = { 3, 1 }; | |
634 | static const struct aarch64_register x4 = { 4, 1 }; | |
635 | ||
636 | /* General purpose scratch registers (32 bit). */ | |
afbe19f8 | 637 | static const struct aarch64_register w0 = { 0, 0 }; |
bb903df0 PL |
638 | static const struct aarch64_register w2 = { 2, 0 }; |
639 | ||
640 | /* Intra-procedure scratch registers. */ | |
641 | static const struct aarch64_register ip0 = { 16, 1 }; | |
642 | ||
643 | /* Special purpose registers. */ | |
afbe19f8 PL |
644 | static const struct aarch64_register fp = { 29, 1 }; |
645 | static const struct aarch64_register lr = { 30, 1 }; | |
bb903df0 PL |
646 | static const struct aarch64_register sp = { 31, 1 }; |
647 | static const struct aarch64_register xzr = { 31, 1 }; | |
648 | ||
649 | /* Dynamically allocate a new register. If we know the register | |
650 | statically, we should make it a global as above instead of using this | |
651 | helper function. */ | |
652 | ||
653 | static struct aarch64_register | |
654 | aarch64_register (unsigned num, int is64) | |
655 | { | |
656 | return (struct aarch64_register) { num, is64 }; | |
657 | } | |
658 | ||
659 | /* Helper function to create a register operand, for instructions with | |
660 | different types of operands. | |
661 | ||
662 | For example: | |
663 | p += emit_mov (p, x0, register_operand (x1)); */ | |
664 | ||
665 | static struct aarch64_operand | |
666 | register_operand (struct aarch64_register reg) | |
667 | { | |
668 | struct aarch64_operand operand; | |
669 | ||
670 | operand.type = OPERAND_REGISTER; | |
671 | operand.reg = reg; | |
672 | ||
673 | return operand; | |
674 | } | |
675 | ||
676 | /* Helper function to create an immediate operand, for instructions with | |
677 | different types of operands. | |
678 | ||
679 | For example: | |
680 | p += emit_mov (p, x0, immediate_operand (12)); */ | |
681 | ||
682 | static struct aarch64_operand | |
683 | immediate_operand (uint32_t imm) | |
684 | { | |
685 | struct aarch64_operand operand; | |
686 | ||
687 | operand.type = OPERAND_IMMEDIATE; | |
688 | operand.imm = imm; | |
689 | ||
690 | return operand; | |
691 | } | |
692 | ||
bb903df0 PL |
693 | /* Helper function to create an offset memory operand. |
694 | ||
695 | For example: | |
696 | p += emit_ldr (p, x0, sp, offset_memory_operand (16)); */ | |
697 | ||
698 | static struct aarch64_memory_operand | |
699 | offset_memory_operand (int32_t offset) | |
700 | { | |
701 | return (struct aarch64_memory_operand) { MEMORY_OPERAND_OFFSET, offset }; | |
702 | } | |
703 | ||
704 | /* Helper function to create a pre-index memory operand. | |
705 | ||
706 | For example: | |
707 | p += emit_ldr (p, x0, sp, preindex_memory_operand (16)); */ | |
708 | ||
709 | static struct aarch64_memory_operand | |
710 | preindex_memory_operand (int32_t index) | |
711 | { | |
712 | return (struct aarch64_memory_operand) { MEMORY_OPERAND_PREINDEX, index }; | |
713 | } | |
714 | ||
afbe19f8 PL |
715 | /* Helper function to create a post-index memory operand. |
716 | ||
717 | For example: | |
718 | p += emit_ldr (p, x0, sp, postindex_memory_operand (16)); */ | |
719 | ||
720 | static struct aarch64_memory_operand | |
721 | postindex_memory_operand (int32_t index) | |
722 | { | |
723 | return (struct aarch64_memory_operand) { MEMORY_OPERAND_POSTINDEX, index }; | |
724 | } | |
725 | ||
bb903df0 PL |
726 | /* System control registers. These special registers can be written and |
727 | read with the MRS and MSR instructions. | |
728 | ||
729 | - NZCV: Condition flags. GDB refers to this register under the CPSR | |
730 | name. | |
731 | - FPSR: Floating-point status register. | |
732 | - FPCR: Floating-point control registers. | |
733 | - TPIDR_EL0: Software thread ID register. */ | |
734 | ||
735 | enum aarch64_system_control_registers | |
736 | { | |
737 | /* op0 op1 crn crm op2 */ | |
738 | NZCV = (0x1 << 14) | (0x3 << 11) | (0x4 << 7) | (0x2 << 3) | 0x0, | |
739 | FPSR = (0x1 << 14) | (0x3 << 11) | (0x4 << 7) | (0x4 << 3) | 0x1, | |
740 | FPCR = (0x1 << 14) | (0x3 << 11) | (0x4 << 7) | (0x4 << 3) | 0x0, | |
741 | TPIDR_EL0 = (0x1 << 14) | (0x3 << 11) | (0xd << 7) | (0x0 << 3) | 0x2 | |
742 | }; | |
743 | ||
bb903df0 PL |
744 | /* Write a BLR instruction into *BUF. |
745 | ||
746 | BLR rn | |
747 | ||
748 | RN is the register to branch to. */ | |
749 | ||
750 | static int | |
751 | emit_blr (uint32_t *buf, struct aarch64_register rn) | |
752 | { | |
e1c587c3 | 753 | return aarch64_emit_insn (buf, BLR | ENCODE (rn.num, 5, 5)); |
bb903df0 PL |
754 | } |
755 | ||
afbe19f8 | 756 | /* Write a RET instruction into *BUF. |
bb903df0 | 757 | |
afbe19f8 | 758 | RET xn |
bb903df0 | 759 | |
afbe19f8 | 760 | RN is the register to branch to. */ |
bb903df0 PL |
761 | |
762 | static int | |
afbe19f8 PL |
763 | emit_ret (uint32_t *buf, struct aarch64_register rn) |
764 | { | |
e1c587c3 | 765 | return aarch64_emit_insn (buf, RET | ENCODE (rn.num, 5, 5)); |
afbe19f8 PL |
766 | } |
767 | ||
768 | static int | |
769 | emit_load_store_pair (uint32_t *buf, enum aarch64_opcodes opcode, | |
770 | struct aarch64_register rt, | |
771 | struct aarch64_register rt2, | |
772 | struct aarch64_register rn, | |
773 | struct aarch64_memory_operand operand) | |
bb903df0 PL |
774 | { |
775 | uint32_t opc; | |
776 | uint32_t pre_index; | |
777 | uint32_t write_back; | |
778 | ||
779 | if (rt.is64) | |
780 | opc = ENCODE (2, 2, 30); | |
781 | else | |
782 | opc = ENCODE (0, 2, 30); | |
783 | ||
784 | switch (operand.type) | |
785 | { | |
786 | case MEMORY_OPERAND_OFFSET: | |
787 | { | |
788 | pre_index = ENCODE (1, 1, 24); | |
789 | write_back = ENCODE (0, 1, 23); | |
790 | break; | |
791 | } | |
afbe19f8 PL |
792 | case MEMORY_OPERAND_POSTINDEX: |
793 | { | |
794 | pre_index = ENCODE (0, 1, 24); | |
795 | write_back = ENCODE (1, 1, 23); | |
796 | break; | |
797 | } | |
bb903df0 PL |
798 | case MEMORY_OPERAND_PREINDEX: |
799 | { | |
800 | pre_index = ENCODE (1, 1, 24); | |
801 | write_back = ENCODE (1, 1, 23); | |
802 | break; | |
803 | } | |
804 | default: | |
805 | return 0; | |
806 | } | |
807 | ||
e1c587c3 YQ |
808 | return aarch64_emit_insn (buf, opcode | opc | pre_index | write_back |
809 | | ENCODE (operand.index >> 3, 7, 15) | |
810 | | ENCODE (rt2.num, 5, 10) | |
811 | | ENCODE (rn.num, 5, 5) | ENCODE (rt.num, 5, 0)); | |
bb903df0 PL |
812 | } |
813 | ||
afbe19f8 PL |
814 | /* Write a STP instruction into *BUF. |
815 | ||
816 | STP rt, rt2, [rn, #offset] | |
817 | STP rt, rt2, [rn, #index]! | |
818 | STP rt, rt2, [rn], #index | |
819 | ||
820 | RT and RT2 are the registers to store. | |
821 | RN is the base address register. | |
822 | OFFSET is the immediate to add to the base address. It is limited to a | |
823 | -512 .. 504 range (7 bits << 3). */ | |
824 | ||
825 | static int | |
826 | emit_stp (uint32_t *buf, struct aarch64_register rt, | |
827 | struct aarch64_register rt2, struct aarch64_register rn, | |
828 | struct aarch64_memory_operand operand) | |
829 | { | |
830 | return emit_load_store_pair (buf, STP, rt, rt2, rn, operand); | |
831 | } | |
832 | ||
833 | /* Write a LDP instruction into *BUF. | |
834 | ||
835 | LDP rt, rt2, [rn, #offset] | |
836 | LDP rt, rt2, [rn, #index]! | |
837 | LDP rt, rt2, [rn], #index | |
838 | ||
839 | RT and RT2 are the registers to store. | |
840 | RN is the base address register. | |
841 | OFFSET is the immediate to add to the base address. It is limited to a | |
842 | -512 .. 504 range (7 bits << 3). */ | |
843 | ||
844 | static int | |
845 | emit_ldp (uint32_t *buf, struct aarch64_register rt, | |
846 | struct aarch64_register rt2, struct aarch64_register rn, | |
847 | struct aarch64_memory_operand operand) | |
848 | { | |
849 | return emit_load_store_pair (buf, LDP, rt, rt2, rn, operand); | |
850 | } | |
851 | ||
bb903df0 PL |
852 | /* Write a LDP (SIMD&VFP) instruction using Q registers into *BUF. |
853 | ||
854 | LDP qt, qt2, [rn, #offset] | |
855 | ||
856 | RT and RT2 are the Q registers to store. | |
857 | RN is the base address register. | |
858 | OFFSET is the immediate to add to the base address. It is limited to | |
859 | -1024 .. 1008 range (7 bits << 4). */ | |
860 | ||
861 | static int | |
862 | emit_ldp_q_offset (uint32_t *buf, unsigned rt, unsigned rt2, | |
863 | struct aarch64_register rn, int32_t offset) | |
864 | { | |
865 | uint32_t opc = ENCODE (2, 2, 30); | |
866 | uint32_t pre_index = ENCODE (1, 1, 24); | |
867 | ||
e1c587c3 YQ |
868 | return aarch64_emit_insn (buf, LDP_SIMD_VFP | opc | pre_index |
869 | | ENCODE (offset >> 4, 7, 15) | |
870 | | ENCODE (rt2, 5, 10) | |
871 | | ENCODE (rn.num, 5, 5) | ENCODE (rt, 5, 0)); | |
bb903df0 PL |
872 | } |
873 | ||
874 | /* Write a STP (SIMD&VFP) instruction using Q registers into *BUF. | |
875 | ||
876 | STP qt, qt2, [rn, #offset] | |
877 | ||
878 | RT and RT2 are the Q registers to store. | |
879 | RN is the base address register. | |
880 | OFFSET is the immediate to add to the base address. It is limited to | |
881 | -1024 .. 1008 range (7 bits << 4). */ | |
882 | ||
883 | static int | |
884 | emit_stp_q_offset (uint32_t *buf, unsigned rt, unsigned rt2, | |
885 | struct aarch64_register rn, int32_t offset) | |
886 | { | |
887 | uint32_t opc = ENCODE (2, 2, 30); | |
888 | uint32_t pre_index = ENCODE (1, 1, 24); | |
889 | ||
e1c587c3 | 890 | return aarch64_emit_insn (buf, STP_SIMD_VFP | opc | pre_index |
b6542f81 YQ |
891 | | ENCODE (offset >> 4, 7, 15) |
892 | | ENCODE (rt2, 5, 10) | |
893 | | ENCODE (rn.num, 5, 5) | ENCODE (rt, 5, 0)); | |
bb903df0 PL |
894 | } |
895 | ||
afbe19f8 PL |
896 | /* Write a LDRH instruction into *BUF. |
897 | ||
898 | LDRH wt, [xn, #offset] | |
899 | LDRH wt, [xn, #index]! | |
900 | LDRH wt, [xn], #index | |
901 | ||
902 | RT is the register to store. | |
903 | RN is the base address register. | |
904 | OFFSET is the immediate to add to the base address. It is limited to | |
905 | 0 .. 32760 range (12 bits << 3). */ | |
906 | ||
907 | static int | |
908 | emit_ldrh (uint32_t *buf, struct aarch64_register rt, | |
909 | struct aarch64_register rn, | |
910 | struct aarch64_memory_operand operand) | |
911 | { | |
1c2e1515 | 912 | return aarch64_emit_load_store (buf, 1, LDR, rt, rn, operand); |
afbe19f8 PL |
913 | } |
914 | ||
915 | /* Write a LDRB instruction into *BUF. | |
916 | ||
917 | LDRB wt, [xn, #offset] | |
918 | LDRB wt, [xn, #index]! | |
919 | LDRB wt, [xn], #index | |
920 | ||
921 | RT is the register to store. | |
922 | RN is the base address register. | |
923 | OFFSET is the immediate to add to the base address. It is limited to | |
924 | 0 .. 32760 range (12 bits << 3). */ | |
925 | ||
926 | static int | |
927 | emit_ldrb (uint32_t *buf, struct aarch64_register rt, | |
928 | struct aarch64_register rn, | |
929 | struct aarch64_memory_operand operand) | |
930 | { | |
1c2e1515 | 931 | return aarch64_emit_load_store (buf, 0, LDR, rt, rn, operand); |
afbe19f8 PL |
932 | } |
933 | ||
bb903df0 | 934 | |
bb903df0 PL |
935 | |
936 | /* Write a STR instruction into *BUF. | |
937 | ||
938 | STR rt, [rn, #offset] | |
939 | STR rt, [rn, #index]! | |
afbe19f8 | 940 | STR rt, [rn], #index |
bb903df0 PL |
941 | |
942 | RT is the register to store. | |
943 | RN is the base address register. | |
944 | OFFSET is the immediate to add to the base address. It is limited to | |
945 | 0 .. 32760 range (12 bits << 3). */ | |
946 | ||
947 | static int | |
948 | emit_str (uint32_t *buf, struct aarch64_register rt, | |
949 | struct aarch64_register rn, | |
950 | struct aarch64_memory_operand operand) | |
951 | { | |
1c2e1515 | 952 | return aarch64_emit_load_store (buf, rt.is64 ? 3 : 2, STR, rt, rn, operand); |
bb903df0 PL |
953 | } |
954 | ||
955 | /* Helper function emitting an exclusive load or store instruction. */ | |
956 | ||
957 | static int | |
958 | emit_load_store_exclusive (uint32_t *buf, uint32_t size, | |
959 | enum aarch64_opcodes opcode, | |
960 | struct aarch64_register rs, | |
961 | struct aarch64_register rt, | |
962 | struct aarch64_register rt2, | |
963 | struct aarch64_register rn) | |
964 | { | |
e1c587c3 YQ |
965 | return aarch64_emit_insn (buf, opcode | ENCODE (size, 2, 30) |
966 | | ENCODE (rs.num, 5, 16) | ENCODE (rt2.num, 5, 10) | |
967 | | ENCODE (rn.num, 5, 5) | ENCODE (rt.num, 5, 0)); | |
bb903df0 PL |
968 | } |
969 | ||
970 | /* Write a LAXR instruction into *BUF. | |
971 | ||
972 | LDAXR rt, [xn] | |
973 | ||
974 | RT is the destination register. | |
975 | RN is the base address register. */ | |
976 | ||
977 | static int | |
978 | emit_ldaxr (uint32_t *buf, struct aarch64_register rt, | |
979 | struct aarch64_register rn) | |
980 | { | |
981 | return emit_load_store_exclusive (buf, rt.is64 ? 3 : 2, LDAXR, xzr, rt, | |
982 | xzr, rn); | |
983 | } | |
984 | ||
985 | /* Write a STXR instruction into *BUF. | |
986 | ||
987 | STXR ws, rt, [xn] | |
988 | ||
989 | RS is the result register, it indicates if the store succeeded or not. | |
990 | RT is the destination register. | |
991 | RN is the base address register. */ | |
992 | ||
993 | static int | |
994 | emit_stxr (uint32_t *buf, struct aarch64_register rs, | |
995 | struct aarch64_register rt, struct aarch64_register rn) | |
996 | { | |
997 | return emit_load_store_exclusive (buf, rt.is64 ? 3 : 2, STXR, rs, rt, | |
998 | xzr, rn); | |
999 | } | |
1000 | ||
1001 | /* Write a STLR instruction into *BUF. | |
1002 | ||
1003 | STLR rt, [xn] | |
1004 | ||
1005 | RT is the register to store. | |
1006 | RN is the base address register. */ | |
1007 | ||
1008 | static int | |
1009 | emit_stlr (uint32_t *buf, struct aarch64_register rt, | |
1010 | struct aarch64_register rn) | |
1011 | { | |
1012 | return emit_load_store_exclusive (buf, rt.is64 ? 3 : 2, STLR, xzr, rt, | |
1013 | xzr, rn); | |
1014 | } | |
1015 | ||
1016 | /* Helper function for data processing instructions with register sources. */ | |
1017 | ||
1018 | static int | |
231c0592 | 1019 | emit_data_processing_reg (uint32_t *buf, uint32_t opcode, |
bb903df0 PL |
1020 | struct aarch64_register rd, |
1021 | struct aarch64_register rn, | |
1022 | struct aarch64_register rm) | |
1023 | { | |
1024 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1025 | ||
e1c587c3 YQ |
1026 | return aarch64_emit_insn (buf, opcode | size | ENCODE (rm.num, 5, 16) |
1027 | | ENCODE (rn.num, 5, 5) | ENCODE (rd.num, 5, 0)); | |
bb903df0 PL |
1028 | } |
1029 | ||
1030 | /* Helper function for data processing instructions taking either a register | |
1031 | or an immediate. */ | |
1032 | ||
1033 | static int | |
1034 | emit_data_processing (uint32_t *buf, enum aarch64_opcodes opcode, | |
1035 | struct aarch64_register rd, | |
1036 | struct aarch64_register rn, | |
1037 | struct aarch64_operand operand) | |
1038 | { | |
1039 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1040 | /* The opcode is different for register and immediate source operands. */ | |
1041 | uint32_t operand_opcode; | |
1042 | ||
1043 | if (operand.type == OPERAND_IMMEDIATE) | |
1044 | { | |
1045 | /* xxx1 000x xxxx xxxx xxxx xxxx xxxx xxxx */ | |
1046 | operand_opcode = ENCODE (8, 4, 25); | |
1047 | ||
e1c587c3 YQ |
1048 | return aarch64_emit_insn (buf, opcode | operand_opcode | size |
1049 | | ENCODE (operand.imm, 12, 10) | |
1050 | | ENCODE (rn.num, 5, 5) | |
1051 | | ENCODE (rd.num, 5, 0)); | |
bb903df0 PL |
1052 | } |
1053 | else | |
1054 | { | |
1055 | /* xxx0 101x xxxx xxxx xxxx xxxx xxxx xxxx */ | |
1056 | operand_opcode = ENCODE (5, 4, 25); | |
1057 | ||
1058 | return emit_data_processing_reg (buf, opcode | operand_opcode, rd, | |
1059 | rn, operand.reg); | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | /* Write an ADD instruction into *BUF. | |
1064 | ||
1065 | ADD rd, rn, #imm | |
1066 | ADD rd, rn, rm | |
1067 | ||
1068 | This function handles both an immediate and register add. | |
1069 | ||
1070 | RD is the destination register. | |
1071 | RN is the input register. | |
1072 | OPERAND is the source operand, either of type OPERAND_IMMEDIATE or | |
1073 | OPERAND_REGISTER. */ | |
1074 | ||
1075 | static int | |
1076 | emit_add (uint32_t *buf, struct aarch64_register rd, | |
1077 | struct aarch64_register rn, struct aarch64_operand operand) | |
1078 | { | |
1079 | return emit_data_processing (buf, ADD, rd, rn, operand); | |
1080 | } | |
1081 | ||
1082 | /* Write a SUB instruction into *BUF. | |
1083 | ||
1084 | SUB rd, rn, #imm | |
1085 | SUB rd, rn, rm | |
1086 | ||
1087 | This function handles both an immediate and register sub. | |
1088 | ||
1089 | RD is the destination register. | |
1090 | RN is the input register. | |
1091 | IMM is the immediate to substract to RN. */ | |
1092 | ||
1093 | static int | |
1094 | emit_sub (uint32_t *buf, struct aarch64_register rd, | |
1095 | struct aarch64_register rn, struct aarch64_operand operand) | |
1096 | { | |
1097 | return emit_data_processing (buf, SUB, rd, rn, operand); | |
1098 | } | |
1099 | ||
1100 | /* Write a MOV instruction into *BUF. | |
1101 | ||
1102 | MOV rd, #imm | |
1103 | MOV rd, rm | |
1104 | ||
1105 | This function handles both a wide immediate move and a register move, | |
1106 | with the condition that the source register is not xzr. xzr and the | |
1107 | stack pointer share the same encoding and this function only supports | |
1108 | the stack pointer. | |
1109 | ||
1110 | RD is the destination register. | |
1111 | OPERAND is the source operand, either of type OPERAND_IMMEDIATE or | |
1112 | OPERAND_REGISTER. */ | |
1113 | ||
1114 | static int | |
1115 | emit_mov (uint32_t *buf, struct aarch64_register rd, | |
1116 | struct aarch64_operand operand) | |
1117 | { | |
1118 | if (operand.type == OPERAND_IMMEDIATE) | |
1119 | { | |
1120 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1121 | /* Do not shift the immediate. */ | |
1122 | uint32_t shift = ENCODE (0, 2, 21); | |
1123 | ||
e1c587c3 YQ |
1124 | return aarch64_emit_insn (buf, MOV | size | shift |
1125 | | ENCODE (operand.imm, 16, 5) | |
1126 | | ENCODE (rd.num, 5, 0)); | |
bb903df0 PL |
1127 | } |
1128 | else | |
1129 | return emit_add (buf, rd, operand.reg, immediate_operand (0)); | |
1130 | } | |
1131 | ||
1132 | /* Write a MOVK instruction into *BUF. | |
1133 | ||
1134 | MOVK rd, #imm, lsl #shift | |
1135 | ||
1136 | RD is the destination register. | |
1137 | IMM is the immediate. | |
1138 | SHIFT is the logical shift left to apply to IMM. */ | |
1139 | ||
1140 | static int | |
7781c06f YQ |
1141 | emit_movk (uint32_t *buf, struct aarch64_register rd, uint32_t imm, |
1142 | unsigned shift) | |
bb903df0 PL |
1143 | { |
1144 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1145 | ||
e1c587c3 YQ |
1146 | return aarch64_emit_insn (buf, MOVK | size | ENCODE (shift, 2, 21) | |
1147 | ENCODE (imm, 16, 5) | ENCODE (rd.num, 5, 0)); | |
bb903df0 PL |
1148 | } |
1149 | ||
1150 | /* Write instructions into *BUF in order to move ADDR into a register. | |
1151 | ADDR can be a 64-bit value. | |
1152 | ||
1153 | This function will emit a series of MOV and MOVK instructions, such as: | |
1154 | ||
1155 | MOV xd, #(addr) | |
1156 | MOVK xd, #(addr >> 16), lsl #16 | |
1157 | MOVK xd, #(addr >> 32), lsl #32 | |
1158 | MOVK xd, #(addr >> 48), lsl #48 */ | |
1159 | ||
1160 | static int | |
1161 | emit_mov_addr (uint32_t *buf, struct aarch64_register rd, CORE_ADDR addr) | |
1162 | { | |
1163 | uint32_t *p = buf; | |
1164 | ||
1165 | /* The MOV (wide immediate) instruction clears to top bits of the | |
1166 | register. */ | |
1167 | p += emit_mov (p, rd, immediate_operand (addr & 0xffff)); | |
1168 | ||
1169 | if ((addr >> 16) != 0) | |
1170 | p += emit_movk (p, rd, (addr >> 16) & 0xffff, 1); | |
1171 | else | |
1172 | return p - buf; | |
1173 | ||
1174 | if ((addr >> 32) != 0) | |
1175 | p += emit_movk (p, rd, (addr >> 32) & 0xffff, 2); | |
1176 | else | |
1177 | return p - buf; | |
1178 | ||
1179 | if ((addr >> 48) != 0) | |
1180 | p += emit_movk (p, rd, (addr >> 48) & 0xffff, 3); | |
1181 | ||
1182 | return p - buf; | |
1183 | } | |
1184 | ||
afbe19f8 PL |
1185 | /* Write a SUBS instruction into *BUF. |
1186 | ||
1187 | SUBS rd, rn, rm | |
1188 | ||
1189 | This instruction update the condition flags. | |
1190 | ||
1191 | RD is the destination register. | |
1192 | RN and RM are the source registers. */ | |
1193 | ||
1194 | static int | |
1195 | emit_subs (uint32_t *buf, struct aarch64_register rd, | |
1196 | struct aarch64_register rn, struct aarch64_operand operand) | |
1197 | { | |
1198 | return emit_data_processing (buf, SUBS, rd, rn, operand); | |
1199 | } | |
1200 | ||
1201 | /* Write a CMP instruction into *BUF. | |
1202 | ||
1203 | CMP rn, rm | |
1204 | ||
1205 | This instruction is an alias of SUBS xzr, rn, rm. | |
1206 | ||
1207 | RN and RM are the registers to compare. */ | |
1208 | ||
1209 | static int | |
1210 | emit_cmp (uint32_t *buf, struct aarch64_register rn, | |
1211 | struct aarch64_operand operand) | |
1212 | { | |
1213 | return emit_subs (buf, xzr, rn, operand); | |
1214 | } | |
1215 | ||
1216 | /* Write a AND instruction into *BUF. | |
1217 | ||
1218 | AND rd, rn, rm | |
1219 | ||
1220 | RD is the destination register. | |
1221 | RN and RM are the source registers. */ | |
1222 | ||
1223 | static int | |
1224 | emit_and (uint32_t *buf, struct aarch64_register rd, | |
1225 | struct aarch64_register rn, struct aarch64_register rm) | |
1226 | { | |
1227 | return emit_data_processing_reg (buf, AND, rd, rn, rm); | |
1228 | } | |
1229 | ||
1230 | /* Write a ORR instruction into *BUF. | |
1231 | ||
1232 | ORR rd, rn, rm | |
1233 | ||
1234 | RD is the destination register. | |
1235 | RN and RM are the source registers. */ | |
1236 | ||
1237 | static int | |
1238 | emit_orr (uint32_t *buf, struct aarch64_register rd, | |
1239 | struct aarch64_register rn, struct aarch64_register rm) | |
1240 | { | |
1241 | return emit_data_processing_reg (buf, ORR, rd, rn, rm); | |
1242 | } | |
1243 | ||
1244 | /* Write a ORN instruction into *BUF. | |
1245 | ||
1246 | ORN rd, rn, rm | |
1247 | ||
1248 | RD is the destination register. | |
1249 | RN and RM are the source registers. */ | |
1250 | ||
1251 | static int | |
1252 | emit_orn (uint32_t *buf, struct aarch64_register rd, | |
1253 | struct aarch64_register rn, struct aarch64_register rm) | |
1254 | { | |
1255 | return emit_data_processing_reg (buf, ORN, rd, rn, rm); | |
1256 | } | |
1257 | ||
1258 | /* Write a EOR instruction into *BUF. | |
1259 | ||
1260 | EOR rd, rn, rm | |
1261 | ||
1262 | RD is the destination register. | |
1263 | RN and RM are the source registers. */ | |
1264 | ||
1265 | static int | |
1266 | emit_eor (uint32_t *buf, struct aarch64_register rd, | |
1267 | struct aarch64_register rn, struct aarch64_register rm) | |
1268 | { | |
1269 | return emit_data_processing_reg (buf, EOR, rd, rn, rm); | |
1270 | } | |
1271 | ||
1272 | /* Write a MVN instruction into *BUF. | |
1273 | ||
1274 | MVN rd, rm | |
1275 | ||
1276 | This is an alias for ORN rd, xzr, rm. | |
1277 | ||
1278 | RD is the destination register. | |
1279 | RM is the source register. */ | |
1280 | ||
1281 | static int | |
1282 | emit_mvn (uint32_t *buf, struct aarch64_register rd, | |
1283 | struct aarch64_register rm) | |
1284 | { | |
1285 | return emit_orn (buf, rd, xzr, rm); | |
1286 | } | |
1287 | ||
1288 | /* Write a LSLV instruction into *BUF. | |
1289 | ||
1290 | LSLV rd, rn, rm | |
1291 | ||
1292 | RD is the destination register. | |
1293 | RN and RM are the source registers. */ | |
1294 | ||
1295 | static int | |
1296 | emit_lslv (uint32_t *buf, struct aarch64_register rd, | |
1297 | struct aarch64_register rn, struct aarch64_register rm) | |
1298 | { | |
1299 | return emit_data_processing_reg (buf, LSLV, rd, rn, rm); | |
1300 | } | |
1301 | ||
1302 | /* Write a LSRV instruction into *BUF. | |
1303 | ||
1304 | LSRV rd, rn, rm | |
1305 | ||
1306 | RD is the destination register. | |
1307 | RN and RM are the source registers. */ | |
1308 | ||
1309 | static int | |
1310 | emit_lsrv (uint32_t *buf, struct aarch64_register rd, | |
1311 | struct aarch64_register rn, struct aarch64_register rm) | |
1312 | { | |
1313 | return emit_data_processing_reg (buf, LSRV, rd, rn, rm); | |
1314 | } | |
1315 | ||
1316 | /* Write a ASRV instruction into *BUF. | |
1317 | ||
1318 | ASRV rd, rn, rm | |
1319 | ||
1320 | RD is the destination register. | |
1321 | RN and RM are the source registers. */ | |
1322 | ||
1323 | static int | |
1324 | emit_asrv (uint32_t *buf, struct aarch64_register rd, | |
1325 | struct aarch64_register rn, struct aarch64_register rm) | |
1326 | { | |
1327 | return emit_data_processing_reg (buf, ASRV, rd, rn, rm); | |
1328 | } | |
1329 | ||
1330 | /* Write a MUL instruction into *BUF. | |
1331 | ||
1332 | MUL rd, rn, rm | |
1333 | ||
1334 | RD is the destination register. | |
1335 | RN and RM are the source registers. */ | |
1336 | ||
1337 | static int | |
1338 | emit_mul (uint32_t *buf, struct aarch64_register rd, | |
1339 | struct aarch64_register rn, struct aarch64_register rm) | |
1340 | { | |
1341 | return emit_data_processing_reg (buf, MUL, rd, rn, rm); | |
1342 | } | |
1343 | ||
bb903df0 PL |
1344 | /* Write a MRS instruction into *BUF. The register size is 64-bit. |
1345 | ||
1346 | MRS xt, system_reg | |
1347 | ||
1348 | RT is the destination register. | |
1349 | SYSTEM_REG is special purpose register to read. */ | |
1350 | ||
1351 | static int | |
1352 | emit_mrs (uint32_t *buf, struct aarch64_register rt, | |
1353 | enum aarch64_system_control_registers system_reg) | |
1354 | { | |
e1c587c3 YQ |
1355 | return aarch64_emit_insn (buf, MRS | ENCODE (system_reg, 15, 5) |
1356 | | ENCODE (rt.num, 5, 0)); | |
bb903df0 PL |
1357 | } |
1358 | ||
1359 | /* Write a MSR instruction into *BUF. The register size is 64-bit. | |
1360 | ||
1361 | MSR system_reg, xt | |
1362 | ||
1363 | SYSTEM_REG is special purpose register to write. | |
1364 | RT is the input register. */ | |
1365 | ||
1366 | static int | |
1367 | emit_msr (uint32_t *buf, enum aarch64_system_control_registers system_reg, | |
1368 | struct aarch64_register rt) | |
1369 | { | |
e1c587c3 YQ |
1370 | return aarch64_emit_insn (buf, MSR | ENCODE (system_reg, 15, 5) |
1371 | | ENCODE (rt.num, 5, 0)); | |
bb903df0 PL |
1372 | } |
1373 | ||
1374 | /* Write a SEVL instruction into *BUF. | |
1375 | ||
1376 | This is a hint instruction telling the hardware to trigger an event. */ | |
1377 | ||
1378 | static int | |
1379 | emit_sevl (uint32_t *buf) | |
1380 | { | |
e1c587c3 | 1381 | return aarch64_emit_insn (buf, SEVL); |
bb903df0 PL |
1382 | } |
1383 | ||
1384 | /* Write a WFE instruction into *BUF. | |
1385 | ||
1386 | This is a hint instruction telling the hardware to wait for an event. */ | |
1387 | ||
1388 | static int | |
1389 | emit_wfe (uint32_t *buf) | |
1390 | { | |
e1c587c3 | 1391 | return aarch64_emit_insn (buf, WFE); |
bb903df0 PL |
1392 | } |
1393 | ||
afbe19f8 PL |
1394 | /* Write a SBFM instruction into *BUF. |
1395 | ||
1396 | SBFM rd, rn, #immr, #imms | |
1397 | ||
1398 | This instruction moves the bits from #immr to #imms into the | |
1399 | destination, sign extending the result. | |
1400 | ||
1401 | RD is the destination register. | |
1402 | RN is the source register. | |
1403 | IMMR is the bit number to start at (least significant bit). | |
1404 | IMMS is the bit number to stop at (most significant bit). */ | |
1405 | ||
1406 | static int | |
1407 | emit_sbfm (uint32_t *buf, struct aarch64_register rd, | |
1408 | struct aarch64_register rn, uint32_t immr, uint32_t imms) | |
1409 | { | |
1410 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1411 | uint32_t n = ENCODE (rd.is64, 1, 22); | |
1412 | ||
e1c587c3 YQ |
1413 | return aarch64_emit_insn (buf, SBFM | size | n | ENCODE (immr, 6, 16) |
1414 | | ENCODE (imms, 6, 10) | ENCODE (rn.num, 5, 5) | |
1415 | | ENCODE (rd.num, 5, 0)); | |
afbe19f8 PL |
1416 | } |
1417 | ||
1418 | /* Write a SBFX instruction into *BUF. | |
1419 | ||
1420 | SBFX rd, rn, #lsb, #width | |
1421 | ||
1422 | This instruction moves #width bits from #lsb into the destination, sign | |
1423 | extending the result. This is an alias for: | |
1424 | ||
1425 | SBFM rd, rn, #lsb, #(lsb + width - 1) | |
1426 | ||
1427 | RD is the destination register. | |
1428 | RN is the source register. | |
1429 | LSB is the bit number to start at (least significant bit). | |
1430 | WIDTH is the number of bits to move. */ | |
1431 | ||
1432 | static int | |
1433 | emit_sbfx (uint32_t *buf, struct aarch64_register rd, | |
1434 | struct aarch64_register rn, uint32_t lsb, uint32_t width) | |
1435 | { | |
1436 | return emit_sbfm (buf, rd, rn, lsb, lsb + width - 1); | |
1437 | } | |
1438 | ||
1439 | /* Write a UBFM instruction into *BUF. | |
1440 | ||
1441 | UBFM rd, rn, #immr, #imms | |
1442 | ||
1443 | This instruction moves the bits from #immr to #imms into the | |
1444 | destination, extending the result with zeros. | |
1445 | ||
1446 | RD is the destination register. | |
1447 | RN is the source register. | |
1448 | IMMR is the bit number to start at (least significant bit). | |
1449 | IMMS is the bit number to stop at (most significant bit). */ | |
1450 | ||
1451 | static int | |
1452 | emit_ubfm (uint32_t *buf, struct aarch64_register rd, | |
1453 | struct aarch64_register rn, uint32_t immr, uint32_t imms) | |
1454 | { | |
1455 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1456 | uint32_t n = ENCODE (rd.is64, 1, 22); | |
1457 | ||
e1c587c3 YQ |
1458 | return aarch64_emit_insn (buf, UBFM | size | n | ENCODE (immr, 6, 16) |
1459 | | ENCODE (imms, 6, 10) | ENCODE (rn.num, 5, 5) | |
1460 | | ENCODE (rd.num, 5, 0)); | |
afbe19f8 PL |
1461 | } |
1462 | ||
1463 | /* Write a UBFX instruction into *BUF. | |
1464 | ||
1465 | UBFX rd, rn, #lsb, #width | |
1466 | ||
1467 | This instruction moves #width bits from #lsb into the destination, | |
1468 | extending the result with zeros. This is an alias for: | |
1469 | ||
1470 | UBFM rd, rn, #lsb, #(lsb + width - 1) | |
1471 | ||
1472 | RD is the destination register. | |
1473 | RN is the source register. | |
1474 | LSB is the bit number to start at (least significant bit). | |
1475 | WIDTH is the number of bits to move. */ | |
1476 | ||
1477 | static int | |
1478 | emit_ubfx (uint32_t *buf, struct aarch64_register rd, | |
1479 | struct aarch64_register rn, uint32_t lsb, uint32_t width) | |
1480 | { | |
1481 | return emit_ubfm (buf, rd, rn, lsb, lsb + width - 1); | |
1482 | } | |
1483 | ||
1484 | /* Write a CSINC instruction into *BUF. | |
1485 | ||
1486 | CSINC rd, rn, rm, cond | |
1487 | ||
1488 | This instruction conditionally increments rn or rm and places the result | |
1489 | in rd. rn is chosen is the condition is true. | |
1490 | ||
1491 | RD is the destination register. | |
1492 | RN and RM are the source registers. | |
1493 | COND is the encoded condition. */ | |
1494 | ||
1495 | static int | |
1496 | emit_csinc (uint32_t *buf, struct aarch64_register rd, | |
1497 | struct aarch64_register rn, struct aarch64_register rm, | |
1498 | unsigned cond) | |
1499 | { | |
1500 | uint32_t size = ENCODE (rd.is64, 1, 31); | |
1501 | ||
e1c587c3 YQ |
1502 | return aarch64_emit_insn (buf, CSINC | size | ENCODE (rm.num, 5, 16) |
1503 | | ENCODE (cond, 4, 12) | ENCODE (rn.num, 5, 5) | |
1504 | | ENCODE (rd.num, 5, 0)); | |
afbe19f8 PL |
1505 | } |
1506 | ||
1507 | /* Write a CSET instruction into *BUF. | |
1508 | ||
1509 | CSET rd, cond | |
1510 | ||
1511 | This instruction conditionally write 1 or 0 in the destination register. | |
1512 | 1 is written if the condition is true. This is an alias for: | |
1513 | ||
1514 | CSINC rd, xzr, xzr, !cond | |
1515 | ||
1516 | Note that the condition needs to be inverted. | |
1517 | ||
1518 | RD is the destination register. | |
1519 | RN and RM are the source registers. | |
1520 | COND is the encoded condition. */ | |
1521 | ||
1522 | static int | |
1523 | emit_cset (uint32_t *buf, struct aarch64_register rd, unsigned cond) | |
1524 | { | |
1525 | /* The least significant bit of the condition needs toggling in order to | |
1526 | invert it. */ | |
1527 | return emit_csinc (buf, rd, xzr, xzr, cond ^ 0x1); | |
1528 | } | |
1529 | ||
bb903df0 PL |
1530 | /* Write LEN instructions from BUF into the inferior memory at *TO. |
1531 | ||
1532 | Note instructions are always little endian on AArch64, unlike data. */ | |
1533 | ||
1534 | static void | |
1535 | append_insns (CORE_ADDR *to, size_t len, const uint32_t *buf) | |
1536 | { | |
1537 | size_t byte_len = len * sizeof (uint32_t); | |
1538 | #if (__BYTE_ORDER == __BIG_ENDIAN) | |
1539 | uint32_t *le_buf = xmalloc (byte_len); | |
1540 | size_t i; | |
1541 | ||
1542 | for (i = 0; i < len; i++) | |
1543 | le_buf[i] = htole32 (buf[i]); | |
1544 | ||
1545 | write_inferior_memory (*to, (const unsigned char *) le_buf, byte_len); | |
1546 | ||
1547 | xfree (le_buf); | |
1548 | #else | |
1549 | write_inferior_memory (*to, (const unsigned char *) buf, byte_len); | |
1550 | #endif | |
1551 | ||
1552 | *to += byte_len; | |
1553 | } | |
1554 | ||
0badd99f YQ |
1555 | /* Sub-class of struct aarch64_insn_data, store information of |
1556 | instruction relocation for fast tracepoint. Visitor can | |
1557 | relocate an instruction from BASE.INSN_ADDR to NEW_ADDR and save | |
1558 | the relocated instructions in buffer pointed by INSN_PTR. */ | |
bb903df0 | 1559 | |
0badd99f YQ |
1560 | struct aarch64_insn_relocation_data |
1561 | { | |
1562 | struct aarch64_insn_data base; | |
1563 | ||
1564 | /* The new address the instruction is relocated to. */ | |
1565 | CORE_ADDR new_addr; | |
1566 | /* Pointer to the buffer of relocated instruction(s). */ | |
1567 | uint32_t *insn_ptr; | |
1568 | }; | |
1569 | ||
1570 | /* Implementation of aarch64_insn_visitor method "b". */ | |
1571 | ||
1572 | static void | |
1573 | aarch64_ftrace_insn_reloc_b (const int is_bl, const int32_t offset, | |
1574 | struct aarch64_insn_data *data) | |
1575 | { | |
1576 | struct aarch64_insn_relocation_data *insn_reloc | |
1577 | = (struct aarch64_insn_relocation_data *) data; | |
2ac09a5b | 1578 | int64_t new_offset |
0badd99f YQ |
1579 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
1580 | ||
1581 | if (can_encode_int32 (new_offset, 28)) | |
1582 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, is_bl, new_offset); | |
1583 | } | |
1584 | ||
1585 | /* Implementation of aarch64_insn_visitor method "b_cond". */ | |
1586 | ||
1587 | static void | |
1588 | aarch64_ftrace_insn_reloc_b_cond (const unsigned cond, const int32_t offset, | |
1589 | struct aarch64_insn_data *data) | |
1590 | { | |
1591 | struct aarch64_insn_relocation_data *insn_reloc | |
1592 | = (struct aarch64_insn_relocation_data *) data; | |
2ac09a5b | 1593 | int64_t new_offset |
0badd99f YQ |
1594 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
1595 | ||
1596 | if (can_encode_int32 (new_offset, 21)) | |
1597 | { | |
1598 | insn_reloc->insn_ptr += emit_bcond (insn_reloc->insn_ptr, cond, | |
1599 | new_offset); | |
bb903df0 | 1600 | } |
0badd99f | 1601 | else if (can_encode_int32 (new_offset, 28)) |
bb903df0 | 1602 | { |
0badd99f YQ |
1603 | /* The offset is out of range for a conditional branch |
1604 | instruction but not for a unconditional branch. We can use | |
1605 | the following instructions instead: | |
bb903df0 | 1606 | |
0badd99f YQ |
1607 | B.COND TAKEN ; If cond is true, then jump to TAKEN. |
1608 | B NOT_TAKEN ; Else jump over TAKEN and continue. | |
1609 | TAKEN: | |
1610 | B #(offset - 8) | |
1611 | NOT_TAKEN: | |
1612 | ||
1613 | */ | |
1614 | ||
1615 | insn_reloc->insn_ptr += emit_bcond (insn_reloc->insn_ptr, cond, 8); | |
1616 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, 8); | |
1617 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, new_offset - 8); | |
bb903df0 | 1618 | } |
0badd99f | 1619 | } |
bb903df0 | 1620 | |
0badd99f YQ |
1621 | /* Implementation of aarch64_insn_visitor method "cb". */ |
1622 | ||
1623 | static void | |
1624 | aarch64_ftrace_insn_reloc_cb (const int32_t offset, const int is_cbnz, | |
1625 | const unsigned rn, int is64, | |
1626 | struct aarch64_insn_data *data) | |
1627 | { | |
1628 | struct aarch64_insn_relocation_data *insn_reloc | |
1629 | = (struct aarch64_insn_relocation_data *) data; | |
2ac09a5b | 1630 | int64_t new_offset |
0badd99f YQ |
1631 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
1632 | ||
1633 | if (can_encode_int32 (new_offset, 21)) | |
1634 | { | |
1635 | insn_reloc->insn_ptr += emit_cb (insn_reloc->insn_ptr, is_cbnz, | |
1636 | aarch64_register (rn, is64), new_offset); | |
bb903df0 | 1637 | } |
0badd99f | 1638 | else if (can_encode_int32 (new_offset, 28)) |
bb903df0 | 1639 | { |
0badd99f YQ |
1640 | /* The offset is out of range for a compare and branch |
1641 | instruction but not for a unconditional branch. We can use | |
1642 | the following instructions instead: | |
1643 | ||
1644 | CBZ xn, TAKEN ; xn == 0, then jump to TAKEN. | |
1645 | B NOT_TAKEN ; Else jump over TAKEN and continue. | |
1646 | TAKEN: | |
1647 | B #(offset - 8) | |
1648 | NOT_TAKEN: | |
1649 | ||
1650 | */ | |
1651 | insn_reloc->insn_ptr += emit_cb (insn_reloc->insn_ptr, is_cbnz, | |
1652 | aarch64_register (rn, is64), 8); | |
1653 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, 8); | |
1654 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, new_offset - 8); | |
1655 | } | |
1656 | } | |
bb903df0 | 1657 | |
0badd99f | 1658 | /* Implementation of aarch64_insn_visitor method "tb". */ |
bb903df0 | 1659 | |
0badd99f YQ |
1660 | static void |
1661 | aarch64_ftrace_insn_reloc_tb (const int32_t offset, int is_tbnz, | |
1662 | const unsigned rt, unsigned bit, | |
1663 | struct aarch64_insn_data *data) | |
1664 | { | |
1665 | struct aarch64_insn_relocation_data *insn_reloc | |
1666 | = (struct aarch64_insn_relocation_data *) data; | |
2ac09a5b | 1667 | int64_t new_offset |
0badd99f YQ |
1668 | = insn_reloc->base.insn_addr - insn_reloc->new_addr + offset; |
1669 | ||
1670 | if (can_encode_int32 (new_offset, 16)) | |
1671 | { | |
1672 | insn_reloc->insn_ptr += emit_tb (insn_reloc->insn_ptr, is_tbnz, bit, | |
1673 | aarch64_register (rt, 1), new_offset); | |
bb903df0 | 1674 | } |
0badd99f | 1675 | else if (can_encode_int32 (new_offset, 28)) |
bb903df0 | 1676 | { |
0badd99f YQ |
1677 | /* The offset is out of range for a test bit and branch |
1678 | instruction but not for a unconditional branch. We can use | |
1679 | the following instructions instead: | |
1680 | ||
1681 | TBZ xn, #bit, TAKEN ; xn[bit] == 0, then jump to TAKEN. | |
1682 | B NOT_TAKEN ; Else jump over TAKEN and continue. | |
1683 | TAKEN: | |
1684 | B #(offset - 8) | |
1685 | NOT_TAKEN: | |
1686 | ||
1687 | */ | |
1688 | insn_reloc->insn_ptr += emit_tb (insn_reloc->insn_ptr, is_tbnz, bit, | |
1689 | aarch64_register (rt, 1), 8); | |
1690 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, 8); | |
1691 | insn_reloc->insn_ptr += emit_b (insn_reloc->insn_ptr, 0, | |
1692 | new_offset - 8); | |
1693 | } | |
1694 | } | |
bb903df0 | 1695 | |
0badd99f | 1696 | /* Implementation of aarch64_insn_visitor method "adr". */ |
bb903df0 | 1697 | |
0badd99f YQ |
1698 | static void |
1699 | aarch64_ftrace_insn_reloc_adr (const int32_t offset, const unsigned rd, | |
1700 | const int is_adrp, | |
1701 | struct aarch64_insn_data *data) | |
1702 | { | |
1703 | struct aarch64_insn_relocation_data *insn_reloc | |
1704 | = (struct aarch64_insn_relocation_data *) data; | |
1705 | /* We know exactly the address the ADR{P,} instruction will compute. | |
1706 | We can just write it to the destination register. */ | |
1707 | CORE_ADDR address = data->insn_addr + offset; | |
bb903df0 | 1708 | |
0badd99f YQ |
1709 | if (is_adrp) |
1710 | { | |
1711 | /* Clear the lower 12 bits of the offset to get the 4K page. */ | |
1712 | insn_reloc->insn_ptr += emit_mov_addr (insn_reloc->insn_ptr, | |
1713 | aarch64_register (rd, 1), | |
1714 | address & ~0xfff); | |
1715 | } | |
1716 | else | |
1717 | insn_reloc->insn_ptr += emit_mov_addr (insn_reloc->insn_ptr, | |
1718 | aarch64_register (rd, 1), address); | |
1719 | } | |
bb903df0 | 1720 | |
0badd99f | 1721 | /* Implementation of aarch64_insn_visitor method "ldr_literal". */ |
bb903df0 | 1722 | |
0badd99f YQ |
1723 | static void |
1724 | aarch64_ftrace_insn_reloc_ldr_literal (const int32_t offset, const int is_sw, | |
1725 | const unsigned rt, const int is64, | |
1726 | struct aarch64_insn_data *data) | |
1727 | { | |
1728 | struct aarch64_insn_relocation_data *insn_reloc | |
1729 | = (struct aarch64_insn_relocation_data *) data; | |
1730 | CORE_ADDR address = data->insn_addr + offset; | |
1731 | ||
1732 | insn_reloc->insn_ptr += emit_mov_addr (insn_reloc->insn_ptr, | |
1733 | aarch64_register (rt, 1), address); | |
1734 | ||
1735 | /* We know exactly what address to load from, and what register we | |
1736 | can use: | |
1737 | ||
1738 | MOV xd, #(oldloc + offset) | |
1739 | MOVK xd, #((oldloc + offset) >> 16), lsl #16 | |
1740 | ... | |
1741 | ||
1742 | LDR xd, [xd] ; or LDRSW xd, [xd] | |
1743 | ||
1744 | */ | |
1745 | ||
1746 | if (is_sw) | |
1747 | insn_reloc->insn_ptr += emit_ldrsw (insn_reloc->insn_ptr, | |
1748 | aarch64_register (rt, 1), | |
1749 | aarch64_register (rt, 1), | |
1750 | offset_memory_operand (0)); | |
bb903df0 | 1751 | else |
0badd99f YQ |
1752 | insn_reloc->insn_ptr += emit_ldr (insn_reloc->insn_ptr, |
1753 | aarch64_register (rt, is64), | |
1754 | aarch64_register (rt, 1), | |
1755 | offset_memory_operand (0)); | |
1756 | } | |
1757 | ||
1758 | /* Implementation of aarch64_insn_visitor method "others". */ | |
1759 | ||
1760 | static void | |
1761 | aarch64_ftrace_insn_reloc_others (const uint32_t insn, | |
1762 | struct aarch64_insn_data *data) | |
1763 | { | |
1764 | struct aarch64_insn_relocation_data *insn_reloc | |
1765 | = (struct aarch64_insn_relocation_data *) data; | |
bb903df0 | 1766 | |
0badd99f YQ |
1767 | /* The instruction is not PC relative. Just re-emit it at the new |
1768 | location. */ | |
e1c587c3 | 1769 | insn_reloc->insn_ptr += aarch64_emit_insn (insn_reloc->insn_ptr, insn); |
0badd99f YQ |
1770 | } |
1771 | ||
1772 | static const struct aarch64_insn_visitor visitor = | |
1773 | { | |
1774 | aarch64_ftrace_insn_reloc_b, | |
1775 | aarch64_ftrace_insn_reloc_b_cond, | |
1776 | aarch64_ftrace_insn_reloc_cb, | |
1777 | aarch64_ftrace_insn_reloc_tb, | |
1778 | aarch64_ftrace_insn_reloc_adr, | |
1779 | aarch64_ftrace_insn_reloc_ldr_literal, | |
1780 | aarch64_ftrace_insn_reloc_others, | |
1781 | }; | |
1782 | ||
bb903df0 PL |
1783 | /* Implementation of linux_target_ops method |
1784 | "install_fast_tracepoint_jump_pad". */ | |
1785 | ||
1786 | static int | |
1787 | aarch64_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, | |
1788 | CORE_ADDR tpaddr, | |
1789 | CORE_ADDR collector, | |
1790 | CORE_ADDR lockaddr, | |
1791 | ULONGEST orig_size, | |
1792 | CORE_ADDR *jump_entry, | |
1793 | CORE_ADDR *trampoline, | |
1794 | ULONGEST *trampoline_size, | |
1795 | unsigned char *jjump_pad_insn, | |
1796 | ULONGEST *jjump_pad_insn_size, | |
1797 | CORE_ADDR *adjusted_insn_addr, | |
1798 | CORE_ADDR *adjusted_insn_addr_end, | |
1799 | char *err) | |
1800 | { | |
1801 | uint32_t buf[256]; | |
1802 | uint32_t *p = buf; | |
2ac09a5b | 1803 | int64_t offset; |
bb903df0 | 1804 | int i; |
70b439f0 | 1805 | uint32_t insn; |
bb903df0 | 1806 | CORE_ADDR buildaddr = *jump_entry; |
0badd99f | 1807 | struct aarch64_insn_relocation_data insn_data; |
bb903df0 PL |
1808 | |
1809 | /* We need to save the current state on the stack both to restore it | |
1810 | later and to collect register values when the tracepoint is hit. | |
1811 | ||
1812 | The saved registers are pushed in a layout that needs to be in sync | |
1813 | with aarch64_ft_collect_regmap (see linux-aarch64-ipa.c). Later on | |
1814 | the supply_fast_tracepoint_registers function will fill in the | |
1815 | register cache from a pointer to saved registers on the stack we build | |
1816 | here. | |
1817 | ||
1818 | For simplicity, we set the size of each cell on the stack to 16 bytes. | |
1819 | This way one cell can hold any register type, from system registers | |
1820 | to the 128 bit SIMD&FP registers. Furthermore, the stack pointer | |
1821 | has to be 16 bytes aligned anyway. | |
1822 | ||
1823 | Note that the CPSR register does not exist on AArch64. Instead we | |
1824 | can access system bits describing the process state with the | |
1825 | MRS/MSR instructions, namely the condition flags. We save them as | |
1826 | if they are part of a CPSR register because that's how GDB | |
1827 | interprets these system bits. At the moment, only the condition | |
1828 | flags are saved in CPSR (NZCV). | |
1829 | ||
1830 | Stack layout, each cell is 16 bytes (descending): | |
1831 | ||
1832 | High *-------- SIMD&FP registers from 31 down to 0. --------* | |
1833 | | q31 | | |
1834 | . . | |
1835 | . . 32 cells | |
1836 | . . | |
1837 | | q0 | | |
1838 | *---- General purpose registers from 30 down to 0. ----* | |
1839 | | x30 | | |
1840 | . . | |
1841 | . . 31 cells | |
1842 | . . | |
1843 | | x0 | | |
1844 | *------------- Special purpose registers. -------------* | |
1845 | | SP | | |
1846 | | PC | | |
1847 | | CPSR (NZCV) | 5 cells | |
1848 | | FPSR | | |
1849 | | FPCR | <- SP + 16 | |
1850 | *------------- collecting_t object --------------------* | |
1851 | | TPIDR_EL0 | struct tracepoint * | | |
1852 | Low *------------------------------------------------------* | |
1853 | ||
1854 | After this stack is set up, we issue a call to the collector, passing | |
1855 | it the saved registers at (SP + 16). */ | |
1856 | ||
1857 | /* Push SIMD&FP registers on the stack: | |
1858 | ||
1859 | SUB sp, sp, #(32 * 16) | |
1860 | ||
1861 | STP q30, q31, [sp, #(30 * 16)] | |
1862 | ... | |
1863 | STP q0, q1, [sp] | |
1864 | ||
1865 | */ | |
1866 | p += emit_sub (p, sp, sp, immediate_operand (32 * 16)); | |
1867 | for (i = 30; i >= 0; i -= 2) | |
1868 | p += emit_stp_q_offset (p, i, i + 1, sp, i * 16); | |
1869 | ||
1870 | /* Push general puspose registers on the stack. Note that we do not need | |
1871 | to push x31 as it represents the xzr register and not the stack | |
1872 | pointer in a STR instruction. | |
1873 | ||
1874 | SUB sp, sp, #(31 * 16) | |
1875 | ||
1876 | STR x30, [sp, #(30 * 16)] | |
1877 | ... | |
1878 | STR x0, [sp] | |
1879 | ||
1880 | */ | |
1881 | p += emit_sub (p, sp, sp, immediate_operand (31 * 16)); | |
1882 | for (i = 30; i >= 0; i -= 1) | |
1883 | p += emit_str (p, aarch64_register (i, 1), sp, | |
1884 | offset_memory_operand (i * 16)); | |
1885 | ||
1886 | /* Make space for 5 more cells. | |
1887 | ||
1888 | SUB sp, sp, #(5 * 16) | |
1889 | ||
1890 | */ | |
1891 | p += emit_sub (p, sp, sp, immediate_operand (5 * 16)); | |
1892 | ||
1893 | ||
1894 | /* Save SP: | |
1895 | ||
1896 | ADD x4, sp, #((32 + 31 + 5) * 16) | |
1897 | STR x4, [sp, #(4 * 16)] | |
1898 | ||
1899 | */ | |
1900 | p += emit_add (p, x4, sp, immediate_operand ((32 + 31 + 5) * 16)); | |
1901 | p += emit_str (p, x4, sp, offset_memory_operand (4 * 16)); | |
1902 | ||
1903 | /* Save PC (tracepoint address): | |
1904 | ||
1905 | MOV x3, #(tpaddr) | |
1906 | ... | |
1907 | ||
1908 | STR x3, [sp, #(3 * 16)] | |
1909 | ||
1910 | */ | |
1911 | ||
1912 | p += emit_mov_addr (p, x3, tpaddr); | |
1913 | p += emit_str (p, x3, sp, offset_memory_operand (3 * 16)); | |
1914 | ||
1915 | /* Save CPSR (NZCV), FPSR and FPCR: | |
1916 | ||
1917 | MRS x2, nzcv | |
1918 | MRS x1, fpsr | |
1919 | MRS x0, fpcr | |
1920 | ||
1921 | STR x2, [sp, #(2 * 16)] | |
1922 | STR x1, [sp, #(1 * 16)] | |
1923 | STR x0, [sp, #(0 * 16)] | |
1924 | ||
1925 | */ | |
1926 | p += emit_mrs (p, x2, NZCV); | |
1927 | p += emit_mrs (p, x1, FPSR); | |
1928 | p += emit_mrs (p, x0, FPCR); | |
1929 | p += emit_str (p, x2, sp, offset_memory_operand (2 * 16)); | |
1930 | p += emit_str (p, x1, sp, offset_memory_operand (1 * 16)); | |
1931 | p += emit_str (p, x0, sp, offset_memory_operand (0 * 16)); | |
1932 | ||
1933 | /* Push the collecting_t object. It consist of the address of the | |
1934 | tracepoint and an ID for the current thread. We get the latter by | |
1935 | reading the tpidr_el0 system register. It corresponds to the | |
1936 | NT_ARM_TLS register accessible with ptrace. | |
1937 | ||
1938 | MOV x0, #(tpoint) | |
1939 | ... | |
1940 | ||
1941 | MRS x1, tpidr_el0 | |
1942 | ||
1943 | STP x0, x1, [sp, #-16]! | |
1944 | ||
1945 | */ | |
1946 | ||
1947 | p += emit_mov_addr (p, x0, tpoint); | |
1948 | p += emit_mrs (p, x1, TPIDR_EL0); | |
1949 | p += emit_stp (p, x0, x1, sp, preindex_memory_operand (-16)); | |
1950 | ||
1951 | /* Spin-lock: | |
1952 | ||
1953 | The shared memory for the lock is at lockaddr. It will hold zero | |
1954 | if no-one is holding the lock, otherwise it contains the address of | |
1955 | the collecting_t object on the stack of the thread which acquired it. | |
1956 | ||
1957 | At this stage, the stack pointer points to this thread's collecting_t | |
1958 | object. | |
1959 | ||
1960 | We use the following registers: | |
1961 | - x0: Address of the lock. | |
1962 | - x1: Pointer to collecting_t object. | |
1963 | - x2: Scratch register. | |
1964 | ||
1965 | MOV x0, #(lockaddr) | |
1966 | ... | |
1967 | MOV x1, sp | |
1968 | ||
1969 | ; Trigger an event local to this core. So the following WFE | |
1970 | ; instruction is ignored. | |
1971 | SEVL | |
1972 | again: | |
1973 | ; Wait for an event. The event is triggered by either the SEVL | |
1974 | ; or STLR instructions (store release). | |
1975 | WFE | |
1976 | ||
1977 | ; Atomically read at lockaddr. This marks the memory location as | |
1978 | ; exclusive. This instruction also has memory constraints which | |
1979 | ; make sure all previous data reads and writes are done before | |
1980 | ; executing it. | |
1981 | LDAXR x2, [x0] | |
1982 | ||
1983 | ; Try again if another thread holds the lock. | |
1984 | CBNZ x2, again | |
1985 | ||
1986 | ; We can lock it! Write the address of the collecting_t object. | |
1987 | ; This instruction will fail if the memory location is not marked | |
1988 | ; as exclusive anymore. If it succeeds, it will remove the | |
1989 | ; exclusive mark on the memory location. This way, if another | |
1990 | ; thread executes this instruction before us, we will fail and try | |
1991 | ; all over again. | |
1992 | STXR w2, x1, [x0] | |
1993 | CBNZ w2, again | |
1994 | ||
1995 | */ | |
1996 | ||
1997 | p += emit_mov_addr (p, x0, lockaddr); | |
1998 | p += emit_mov (p, x1, register_operand (sp)); | |
1999 | ||
2000 | p += emit_sevl (p); | |
2001 | p += emit_wfe (p); | |
2002 | p += emit_ldaxr (p, x2, x0); | |
2003 | p += emit_cb (p, 1, w2, -2 * 4); | |
2004 | p += emit_stxr (p, w2, x1, x0); | |
2005 | p += emit_cb (p, 1, x2, -4 * 4); | |
2006 | ||
2007 | /* Call collector (struct tracepoint *, unsigned char *): | |
2008 | ||
2009 | MOV x0, #(tpoint) | |
2010 | ... | |
2011 | ||
2012 | ; Saved registers start after the collecting_t object. | |
2013 | ADD x1, sp, #16 | |
2014 | ||
2015 | ; We use an intra-procedure-call scratch register. | |
2016 | MOV ip0, #(collector) | |
2017 | ... | |
2018 | ||
2019 | ; And call back to C! | |
2020 | BLR ip0 | |
2021 | ||
2022 | */ | |
2023 | ||
2024 | p += emit_mov_addr (p, x0, tpoint); | |
2025 | p += emit_add (p, x1, sp, immediate_operand (16)); | |
2026 | ||
2027 | p += emit_mov_addr (p, ip0, collector); | |
2028 | p += emit_blr (p, ip0); | |
2029 | ||
2030 | /* Release the lock. | |
2031 | ||
2032 | MOV x0, #(lockaddr) | |
2033 | ... | |
2034 | ||
2035 | ; This instruction is a normal store with memory ordering | |
2036 | ; constraints. Thanks to this we do not have to put a data | |
2037 | ; barrier instruction to make sure all data read and writes are done | |
2038 | ; before this instruction is executed. Furthermore, this instrucion | |
2039 | ; will trigger an event, letting other threads know they can grab | |
2040 | ; the lock. | |
2041 | STLR xzr, [x0] | |
2042 | ||
2043 | */ | |
2044 | p += emit_mov_addr (p, x0, lockaddr); | |
2045 | p += emit_stlr (p, xzr, x0); | |
2046 | ||
2047 | /* Free collecting_t object: | |
2048 | ||
2049 | ADD sp, sp, #16 | |
2050 | ||
2051 | */ | |
2052 | p += emit_add (p, sp, sp, immediate_operand (16)); | |
2053 | ||
2054 | /* Restore CPSR (NZCV), FPSR and FPCR. And free all special purpose | |
2055 | registers from the stack. | |
2056 | ||
2057 | LDR x2, [sp, #(2 * 16)] | |
2058 | LDR x1, [sp, #(1 * 16)] | |
2059 | LDR x0, [sp, #(0 * 16)] | |
2060 | ||
2061 | MSR NZCV, x2 | |
2062 | MSR FPSR, x1 | |
2063 | MSR FPCR, x0 | |
2064 | ||
2065 | ADD sp, sp #(5 * 16) | |
2066 | ||
2067 | */ | |
2068 | p += emit_ldr (p, x2, sp, offset_memory_operand (2 * 16)); | |
2069 | p += emit_ldr (p, x1, sp, offset_memory_operand (1 * 16)); | |
2070 | p += emit_ldr (p, x0, sp, offset_memory_operand (0 * 16)); | |
2071 | p += emit_msr (p, NZCV, x2); | |
2072 | p += emit_msr (p, FPSR, x1); | |
2073 | p += emit_msr (p, FPCR, x0); | |
2074 | ||
2075 | p += emit_add (p, sp, sp, immediate_operand (5 * 16)); | |
2076 | ||
2077 | /* Pop general purpose registers: | |
2078 | ||
2079 | LDR x0, [sp] | |
2080 | ... | |
2081 | LDR x30, [sp, #(30 * 16)] | |
2082 | ||
2083 | ADD sp, sp, #(31 * 16) | |
2084 | ||
2085 | */ | |
2086 | for (i = 0; i <= 30; i += 1) | |
2087 | p += emit_ldr (p, aarch64_register (i, 1), sp, | |
2088 | offset_memory_operand (i * 16)); | |
2089 | p += emit_add (p, sp, sp, immediate_operand (31 * 16)); | |
2090 | ||
2091 | /* Pop SIMD&FP registers: | |
2092 | ||
2093 | LDP q0, q1, [sp] | |
2094 | ... | |
2095 | LDP q30, q31, [sp, #(30 * 16)] | |
2096 | ||
2097 | ADD sp, sp, #(32 * 16) | |
2098 | ||
2099 | */ | |
2100 | for (i = 0; i <= 30; i += 2) | |
2101 | p += emit_ldp_q_offset (p, i, i + 1, sp, i * 16); | |
2102 | p += emit_add (p, sp, sp, immediate_operand (32 * 16)); | |
2103 | ||
2104 | /* Write the code into the inferior memory. */ | |
2105 | append_insns (&buildaddr, p - buf, buf); | |
2106 | ||
2107 | /* Now emit the relocated instruction. */ | |
2108 | *adjusted_insn_addr = buildaddr; | |
70b439f0 | 2109 | target_read_uint32 (tpaddr, &insn); |
0badd99f YQ |
2110 | |
2111 | insn_data.base.insn_addr = tpaddr; | |
2112 | insn_data.new_addr = buildaddr; | |
2113 | insn_data.insn_ptr = buf; | |
2114 | ||
2115 | aarch64_relocate_instruction (insn, &visitor, | |
2116 | (struct aarch64_insn_data *) &insn_data); | |
2117 | ||
bb903df0 | 2118 | /* We may not have been able to relocate the instruction. */ |
0badd99f | 2119 | if (insn_data.insn_ptr == buf) |
bb903df0 PL |
2120 | { |
2121 | sprintf (err, | |
2122 | "E.Could not relocate instruction from %s to %s.", | |
2123 | core_addr_to_string_nz (tpaddr), | |
2124 | core_addr_to_string_nz (buildaddr)); | |
2125 | return 1; | |
2126 | } | |
dfaffe9d | 2127 | else |
0badd99f | 2128 | append_insns (&buildaddr, insn_data.insn_ptr - buf, buf); |
dfaffe9d | 2129 | *adjusted_insn_addr_end = buildaddr; |
bb903df0 PL |
2130 | |
2131 | /* Go back to the start of the buffer. */ | |
2132 | p = buf; | |
2133 | ||
2134 | /* Emit a branch back from the jump pad. */ | |
2135 | offset = (tpaddr + orig_size - buildaddr); | |
2136 | if (!can_encode_int32 (offset, 28)) | |
2137 | { | |
2138 | sprintf (err, | |
2139 | "E.Jump back from jump pad too far from tracepoint " | |
2ac09a5b | 2140 | "(offset 0x%" PRIx64 " cannot be encoded in 28 bits).", |
bb903df0 PL |
2141 | offset); |
2142 | return 1; | |
2143 | } | |
2144 | ||
2145 | p += emit_b (p, 0, offset); | |
2146 | append_insns (&buildaddr, p - buf, buf); | |
2147 | ||
2148 | /* Give the caller a branch instruction into the jump pad. */ | |
2149 | offset = (*jump_entry - tpaddr); | |
2150 | if (!can_encode_int32 (offset, 28)) | |
2151 | { | |
2152 | sprintf (err, | |
2153 | "E.Jump pad too far from tracepoint " | |
2ac09a5b | 2154 | "(offset 0x%" PRIx64 " cannot be encoded in 28 bits).", |
bb903df0 PL |
2155 | offset); |
2156 | return 1; | |
2157 | } | |
2158 | ||
2159 | emit_b ((uint32_t *) jjump_pad_insn, 0, offset); | |
2160 | *jjump_pad_insn_size = 4; | |
2161 | ||
2162 | /* Return the end address of our pad. */ | |
2163 | *jump_entry = buildaddr; | |
2164 | ||
2165 | return 0; | |
2166 | } | |
2167 | ||
afbe19f8 PL |
2168 | /* Helper function writing LEN instructions from START into |
2169 | current_insn_ptr. */ | |
2170 | ||
2171 | static void | |
2172 | emit_ops_insns (const uint32_t *start, int len) | |
2173 | { | |
2174 | CORE_ADDR buildaddr = current_insn_ptr; | |
2175 | ||
2176 | if (debug_threads) | |
2177 | debug_printf ("Adding %d instrucions at %s\n", | |
2178 | len, paddress (buildaddr)); | |
2179 | ||
2180 | append_insns (&buildaddr, len, start); | |
2181 | current_insn_ptr = buildaddr; | |
2182 | } | |
2183 | ||
2184 | /* Pop a register from the stack. */ | |
2185 | ||
2186 | static int | |
2187 | emit_pop (uint32_t *buf, struct aarch64_register rt) | |
2188 | { | |
2189 | return emit_ldr (buf, rt, sp, postindex_memory_operand (1 * 16)); | |
2190 | } | |
2191 | ||
2192 | /* Push a register on the stack. */ | |
2193 | ||
2194 | static int | |
2195 | emit_push (uint32_t *buf, struct aarch64_register rt) | |
2196 | { | |
2197 | return emit_str (buf, rt, sp, preindex_memory_operand (-1 * 16)); | |
2198 | } | |
2199 | ||
2200 | /* Implementation of emit_ops method "emit_prologue". */ | |
2201 | ||
2202 | static void | |
2203 | aarch64_emit_prologue (void) | |
2204 | { | |
2205 | uint32_t buf[16]; | |
2206 | uint32_t *p = buf; | |
2207 | ||
2208 | /* This function emit a prologue for the following function prototype: | |
2209 | ||
2210 | enum eval_result_type f (unsigned char *regs, | |
2211 | ULONGEST *value); | |
2212 | ||
2213 | The first argument is a buffer of raw registers. The second | |
2214 | argument is the result of | |
2215 | evaluating the expression, which will be set to whatever is on top of | |
2216 | the stack at the end. | |
2217 | ||
2218 | The stack set up by the prologue is as such: | |
2219 | ||
2220 | High *------------------------------------------------------* | |
2221 | | LR | | |
2222 | | FP | <- FP | |
2223 | | x1 (ULONGEST *value) | | |
2224 | | x0 (unsigned char *regs) | | |
2225 | Low *------------------------------------------------------* | |
2226 | ||
2227 | As we are implementing a stack machine, each opcode can expand the | |
2228 | stack so we never know how far we are from the data saved by this | |
2229 | prologue. In order to be able refer to value and regs later, we save | |
2230 | the current stack pointer in the frame pointer. This way, it is not | |
2231 | clobbered when calling C functions. | |
2232 | ||
2233 | Finally, throughtout every operation, we are using register x0 as the | |
2234 | top of the stack, and x1 as a scratch register. */ | |
2235 | ||
2236 | p += emit_stp (p, x0, x1, sp, preindex_memory_operand (-2 * 16)); | |
2237 | p += emit_str (p, lr, sp, offset_memory_operand (3 * 8)); | |
2238 | p += emit_str (p, fp, sp, offset_memory_operand (2 * 8)); | |
2239 | ||
2240 | p += emit_add (p, fp, sp, immediate_operand (2 * 8)); | |
2241 | ||
2242 | ||
2243 | emit_ops_insns (buf, p - buf); | |
2244 | } | |
2245 | ||
2246 | /* Implementation of emit_ops method "emit_epilogue". */ | |
2247 | ||
2248 | static void | |
2249 | aarch64_emit_epilogue (void) | |
2250 | { | |
2251 | uint32_t buf[16]; | |
2252 | uint32_t *p = buf; | |
2253 | ||
2254 | /* Store the result of the expression (x0) in *value. */ | |
2255 | p += emit_sub (p, x1, fp, immediate_operand (1 * 8)); | |
2256 | p += emit_ldr (p, x1, x1, offset_memory_operand (0)); | |
2257 | p += emit_str (p, x0, x1, offset_memory_operand (0)); | |
2258 | ||
2259 | /* Restore the previous state. */ | |
2260 | p += emit_add (p, sp, fp, immediate_operand (2 * 8)); | |
2261 | p += emit_ldp (p, fp, lr, fp, offset_memory_operand (0)); | |
2262 | ||
2263 | /* Return expr_eval_no_error. */ | |
2264 | p += emit_mov (p, x0, immediate_operand (expr_eval_no_error)); | |
2265 | p += emit_ret (p, lr); | |
2266 | ||
2267 | emit_ops_insns (buf, p - buf); | |
2268 | } | |
2269 | ||
2270 | /* Implementation of emit_ops method "emit_add". */ | |
2271 | ||
2272 | static void | |
2273 | aarch64_emit_add (void) | |
2274 | { | |
2275 | uint32_t buf[16]; | |
2276 | uint32_t *p = buf; | |
2277 | ||
2278 | p += emit_pop (p, x1); | |
45e3745e | 2279 | p += emit_add (p, x0, x1, register_operand (x0)); |
afbe19f8 PL |
2280 | |
2281 | emit_ops_insns (buf, p - buf); | |
2282 | } | |
2283 | ||
2284 | /* Implementation of emit_ops method "emit_sub". */ | |
2285 | ||
2286 | static void | |
2287 | aarch64_emit_sub (void) | |
2288 | { | |
2289 | uint32_t buf[16]; | |
2290 | uint32_t *p = buf; | |
2291 | ||
2292 | p += emit_pop (p, x1); | |
45e3745e | 2293 | p += emit_sub (p, x0, x1, register_operand (x0)); |
afbe19f8 PL |
2294 | |
2295 | emit_ops_insns (buf, p - buf); | |
2296 | } | |
2297 | ||
2298 | /* Implementation of emit_ops method "emit_mul". */ | |
2299 | ||
2300 | static void | |
2301 | aarch64_emit_mul (void) | |
2302 | { | |
2303 | uint32_t buf[16]; | |
2304 | uint32_t *p = buf; | |
2305 | ||
2306 | p += emit_pop (p, x1); | |
2307 | p += emit_mul (p, x0, x1, x0); | |
2308 | ||
2309 | emit_ops_insns (buf, p - buf); | |
2310 | } | |
2311 | ||
2312 | /* Implementation of emit_ops method "emit_lsh". */ | |
2313 | ||
2314 | static void | |
2315 | aarch64_emit_lsh (void) | |
2316 | { | |
2317 | uint32_t buf[16]; | |
2318 | uint32_t *p = buf; | |
2319 | ||
2320 | p += emit_pop (p, x1); | |
2321 | p += emit_lslv (p, x0, x1, x0); | |
2322 | ||
2323 | emit_ops_insns (buf, p - buf); | |
2324 | } | |
2325 | ||
2326 | /* Implementation of emit_ops method "emit_rsh_signed". */ | |
2327 | ||
2328 | static void | |
2329 | aarch64_emit_rsh_signed (void) | |
2330 | { | |
2331 | uint32_t buf[16]; | |
2332 | uint32_t *p = buf; | |
2333 | ||
2334 | p += emit_pop (p, x1); | |
2335 | p += emit_asrv (p, x0, x1, x0); | |
2336 | ||
2337 | emit_ops_insns (buf, p - buf); | |
2338 | } | |
2339 | ||
2340 | /* Implementation of emit_ops method "emit_rsh_unsigned". */ | |
2341 | ||
2342 | static void | |
2343 | aarch64_emit_rsh_unsigned (void) | |
2344 | { | |
2345 | uint32_t buf[16]; | |
2346 | uint32_t *p = buf; | |
2347 | ||
2348 | p += emit_pop (p, x1); | |
2349 | p += emit_lsrv (p, x0, x1, x0); | |
2350 | ||
2351 | emit_ops_insns (buf, p - buf); | |
2352 | } | |
2353 | ||
2354 | /* Implementation of emit_ops method "emit_ext". */ | |
2355 | ||
2356 | static void | |
2357 | aarch64_emit_ext (int arg) | |
2358 | { | |
2359 | uint32_t buf[16]; | |
2360 | uint32_t *p = buf; | |
2361 | ||
2362 | p += emit_sbfx (p, x0, x0, 0, arg); | |
2363 | ||
2364 | emit_ops_insns (buf, p - buf); | |
2365 | } | |
2366 | ||
2367 | /* Implementation of emit_ops method "emit_log_not". */ | |
2368 | ||
2369 | static void | |
2370 | aarch64_emit_log_not (void) | |
2371 | { | |
2372 | uint32_t buf[16]; | |
2373 | uint32_t *p = buf; | |
2374 | ||
2375 | /* If the top of the stack is 0, replace it with 1. Else replace it with | |
2376 | 0. */ | |
2377 | ||
2378 | p += emit_cmp (p, x0, immediate_operand (0)); | |
2379 | p += emit_cset (p, x0, EQ); | |
2380 | ||
2381 | emit_ops_insns (buf, p - buf); | |
2382 | } | |
2383 | ||
2384 | /* Implementation of emit_ops method "emit_bit_and". */ | |
2385 | ||
2386 | static void | |
2387 | aarch64_emit_bit_and (void) | |
2388 | { | |
2389 | uint32_t buf[16]; | |
2390 | uint32_t *p = buf; | |
2391 | ||
2392 | p += emit_pop (p, x1); | |
2393 | p += emit_and (p, x0, x0, x1); | |
2394 | ||
2395 | emit_ops_insns (buf, p - buf); | |
2396 | } | |
2397 | ||
2398 | /* Implementation of emit_ops method "emit_bit_or". */ | |
2399 | ||
2400 | static void | |
2401 | aarch64_emit_bit_or (void) | |
2402 | { | |
2403 | uint32_t buf[16]; | |
2404 | uint32_t *p = buf; | |
2405 | ||
2406 | p += emit_pop (p, x1); | |
2407 | p += emit_orr (p, x0, x0, x1); | |
2408 | ||
2409 | emit_ops_insns (buf, p - buf); | |
2410 | } | |
2411 | ||
2412 | /* Implementation of emit_ops method "emit_bit_xor". */ | |
2413 | ||
2414 | static void | |
2415 | aarch64_emit_bit_xor (void) | |
2416 | { | |
2417 | uint32_t buf[16]; | |
2418 | uint32_t *p = buf; | |
2419 | ||
2420 | p += emit_pop (p, x1); | |
2421 | p += emit_eor (p, x0, x0, x1); | |
2422 | ||
2423 | emit_ops_insns (buf, p - buf); | |
2424 | } | |
2425 | ||
2426 | /* Implementation of emit_ops method "emit_bit_not". */ | |
2427 | ||
2428 | static void | |
2429 | aarch64_emit_bit_not (void) | |
2430 | { | |
2431 | uint32_t buf[16]; | |
2432 | uint32_t *p = buf; | |
2433 | ||
2434 | p += emit_mvn (p, x0, x0); | |
2435 | ||
2436 | emit_ops_insns (buf, p - buf); | |
2437 | } | |
2438 | ||
2439 | /* Implementation of emit_ops method "emit_equal". */ | |
2440 | ||
2441 | static void | |
2442 | aarch64_emit_equal (void) | |
2443 | { | |
2444 | uint32_t buf[16]; | |
2445 | uint32_t *p = buf; | |
2446 | ||
2447 | p += emit_pop (p, x1); | |
2448 | p += emit_cmp (p, x0, register_operand (x1)); | |
2449 | p += emit_cset (p, x0, EQ); | |
2450 | ||
2451 | emit_ops_insns (buf, p - buf); | |
2452 | } | |
2453 | ||
2454 | /* Implementation of emit_ops method "emit_less_signed". */ | |
2455 | ||
2456 | static void | |
2457 | aarch64_emit_less_signed (void) | |
2458 | { | |
2459 | uint32_t buf[16]; | |
2460 | uint32_t *p = buf; | |
2461 | ||
2462 | p += emit_pop (p, x1); | |
2463 | p += emit_cmp (p, x1, register_operand (x0)); | |
2464 | p += emit_cset (p, x0, LT); | |
2465 | ||
2466 | emit_ops_insns (buf, p - buf); | |
2467 | } | |
2468 | ||
2469 | /* Implementation of emit_ops method "emit_less_unsigned". */ | |
2470 | ||
2471 | static void | |
2472 | aarch64_emit_less_unsigned (void) | |
2473 | { | |
2474 | uint32_t buf[16]; | |
2475 | uint32_t *p = buf; | |
2476 | ||
2477 | p += emit_pop (p, x1); | |
2478 | p += emit_cmp (p, x1, register_operand (x0)); | |
2479 | p += emit_cset (p, x0, LO); | |
2480 | ||
2481 | emit_ops_insns (buf, p - buf); | |
2482 | } | |
2483 | ||
2484 | /* Implementation of emit_ops method "emit_ref". */ | |
2485 | ||
2486 | static void | |
2487 | aarch64_emit_ref (int size) | |
2488 | { | |
2489 | uint32_t buf[16]; | |
2490 | uint32_t *p = buf; | |
2491 | ||
2492 | switch (size) | |
2493 | { | |
2494 | case 1: | |
2495 | p += emit_ldrb (p, w0, x0, offset_memory_operand (0)); | |
2496 | break; | |
2497 | case 2: | |
2498 | p += emit_ldrh (p, w0, x0, offset_memory_operand (0)); | |
2499 | break; | |
2500 | case 4: | |
2501 | p += emit_ldr (p, w0, x0, offset_memory_operand (0)); | |
2502 | break; | |
2503 | case 8: | |
2504 | p += emit_ldr (p, x0, x0, offset_memory_operand (0)); | |
2505 | break; | |
2506 | default: | |
2507 | /* Unknown size, bail on compilation. */ | |
2508 | emit_error = 1; | |
2509 | break; | |
2510 | } | |
2511 | ||
2512 | emit_ops_insns (buf, p - buf); | |
2513 | } | |
2514 | ||
2515 | /* Implementation of emit_ops method "emit_if_goto". */ | |
2516 | ||
2517 | static void | |
2518 | aarch64_emit_if_goto (int *offset_p, int *size_p) | |
2519 | { | |
2520 | uint32_t buf[16]; | |
2521 | uint32_t *p = buf; | |
2522 | ||
2523 | /* The Z flag is set or cleared here. */ | |
2524 | p += emit_cmp (p, x0, immediate_operand (0)); | |
2525 | /* This instruction must not change the Z flag. */ | |
2526 | p += emit_pop (p, x0); | |
2527 | /* Branch over the next instruction if x0 == 0. */ | |
2528 | p += emit_bcond (p, EQ, 8); | |
2529 | ||
2530 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2531 | if (offset_p) | |
2532 | *offset_p = (p - buf) * 4; | |
2533 | if (size_p) | |
2534 | *size_p = 4; | |
2535 | p += emit_nop (p); | |
2536 | ||
2537 | emit_ops_insns (buf, p - buf); | |
2538 | } | |
2539 | ||
2540 | /* Implementation of emit_ops method "emit_goto". */ | |
2541 | ||
2542 | static void | |
2543 | aarch64_emit_goto (int *offset_p, int *size_p) | |
2544 | { | |
2545 | uint32_t buf[16]; | |
2546 | uint32_t *p = buf; | |
2547 | ||
2548 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2549 | if (offset_p) | |
2550 | *offset_p = 0; | |
2551 | if (size_p) | |
2552 | *size_p = 4; | |
2553 | p += emit_nop (p); | |
2554 | ||
2555 | emit_ops_insns (buf, p - buf); | |
2556 | } | |
2557 | ||
2558 | /* Implementation of emit_ops method "write_goto_address". */ | |
2559 | ||
2560 | void | |
2561 | aarch64_write_goto_address (CORE_ADDR from, CORE_ADDR to, int size) | |
2562 | { | |
2563 | uint32_t insn; | |
2564 | ||
2565 | emit_b (&insn, 0, to - from); | |
2566 | append_insns (&from, 1, &insn); | |
2567 | } | |
2568 | ||
2569 | /* Implementation of emit_ops method "emit_const". */ | |
2570 | ||
2571 | static void | |
2572 | aarch64_emit_const (LONGEST num) | |
2573 | { | |
2574 | uint32_t buf[16]; | |
2575 | uint32_t *p = buf; | |
2576 | ||
2577 | p += emit_mov_addr (p, x0, num); | |
2578 | ||
2579 | emit_ops_insns (buf, p - buf); | |
2580 | } | |
2581 | ||
2582 | /* Implementation of emit_ops method "emit_call". */ | |
2583 | ||
2584 | static void | |
2585 | aarch64_emit_call (CORE_ADDR fn) | |
2586 | { | |
2587 | uint32_t buf[16]; | |
2588 | uint32_t *p = buf; | |
2589 | ||
2590 | p += emit_mov_addr (p, ip0, fn); | |
2591 | p += emit_blr (p, ip0); | |
2592 | ||
2593 | emit_ops_insns (buf, p - buf); | |
2594 | } | |
2595 | ||
2596 | /* Implementation of emit_ops method "emit_reg". */ | |
2597 | ||
2598 | static void | |
2599 | aarch64_emit_reg (int reg) | |
2600 | { | |
2601 | uint32_t buf[16]; | |
2602 | uint32_t *p = buf; | |
2603 | ||
2604 | /* Set x0 to unsigned char *regs. */ | |
2605 | p += emit_sub (p, x0, fp, immediate_operand (2 * 8)); | |
2606 | p += emit_ldr (p, x0, x0, offset_memory_operand (0)); | |
2607 | p += emit_mov (p, x1, immediate_operand (reg)); | |
2608 | ||
2609 | emit_ops_insns (buf, p - buf); | |
2610 | ||
2611 | aarch64_emit_call (get_raw_reg_func_addr ()); | |
2612 | } | |
2613 | ||
2614 | /* Implementation of emit_ops method "emit_pop". */ | |
2615 | ||
2616 | static void | |
2617 | aarch64_emit_pop (void) | |
2618 | { | |
2619 | uint32_t buf[16]; | |
2620 | uint32_t *p = buf; | |
2621 | ||
2622 | p += emit_pop (p, x0); | |
2623 | ||
2624 | emit_ops_insns (buf, p - buf); | |
2625 | } | |
2626 | ||
2627 | /* Implementation of emit_ops method "emit_stack_flush". */ | |
2628 | ||
2629 | static void | |
2630 | aarch64_emit_stack_flush (void) | |
2631 | { | |
2632 | uint32_t buf[16]; | |
2633 | uint32_t *p = buf; | |
2634 | ||
2635 | p += emit_push (p, x0); | |
2636 | ||
2637 | emit_ops_insns (buf, p - buf); | |
2638 | } | |
2639 | ||
2640 | /* Implementation of emit_ops method "emit_zero_ext". */ | |
2641 | ||
2642 | static void | |
2643 | aarch64_emit_zero_ext (int arg) | |
2644 | { | |
2645 | uint32_t buf[16]; | |
2646 | uint32_t *p = buf; | |
2647 | ||
2648 | p += emit_ubfx (p, x0, x0, 0, arg); | |
2649 | ||
2650 | emit_ops_insns (buf, p - buf); | |
2651 | } | |
2652 | ||
2653 | /* Implementation of emit_ops method "emit_swap". */ | |
2654 | ||
2655 | static void | |
2656 | aarch64_emit_swap (void) | |
2657 | { | |
2658 | uint32_t buf[16]; | |
2659 | uint32_t *p = buf; | |
2660 | ||
2661 | p += emit_ldr (p, x1, sp, offset_memory_operand (0 * 16)); | |
2662 | p += emit_str (p, x0, sp, offset_memory_operand (0 * 16)); | |
2663 | p += emit_mov (p, x0, register_operand (x1)); | |
2664 | ||
2665 | emit_ops_insns (buf, p - buf); | |
2666 | } | |
2667 | ||
2668 | /* Implementation of emit_ops method "emit_stack_adjust". */ | |
2669 | ||
2670 | static void | |
2671 | aarch64_emit_stack_adjust (int n) | |
2672 | { | |
2673 | /* This is not needed with our design. */ | |
2674 | uint32_t buf[16]; | |
2675 | uint32_t *p = buf; | |
2676 | ||
2677 | p += emit_add (p, sp, sp, immediate_operand (n * 16)); | |
2678 | ||
2679 | emit_ops_insns (buf, p - buf); | |
2680 | } | |
2681 | ||
2682 | /* Implementation of emit_ops method "emit_int_call_1". */ | |
2683 | ||
2684 | static void | |
2685 | aarch64_emit_int_call_1 (CORE_ADDR fn, int arg1) | |
2686 | { | |
2687 | uint32_t buf[16]; | |
2688 | uint32_t *p = buf; | |
2689 | ||
2690 | p += emit_mov (p, x0, immediate_operand (arg1)); | |
2691 | ||
2692 | emit_ops_insns (buf, p - buf); | |
2693 | ||
2694 | aarch64_emit_call (fn); | |
2695 | } | |
2696 | ||
2697 | /* Implementation of emit_ops method "emit_void_call_2". */ | |
2698 | ||
2699 | static void | |
2700 | aarch64_emit_void_call_2 (CORE_ADDR fn, int arg1) | |
2701 | { | |
2702 | uint32_t buf[16]; | |
2703 | uint32_t *p = buf; | |
2704 | ||
2705 | /* Push x0 on the stack. */ | |
2706 | aarch64_emit_stack_flush (); | |
2707 | ||
2708 | /* Setup arguments for the function call: | |
2709 | ||
2710 | x0: arg1 | |
2711 | x1: top of the stack | |
2712 | ||
2713 | MOV x1, x0 | |
2714 | MOV x0, #arg1 */ | |
2715 | ||
2716 | p += emit_mov (p, x1, register_operand (x0)); | |
2717 | p += emit_mov (p, x0, immediate_operand (arg1)); | |
2718 | ||
2719 | emit_ops_insns (buf, p - buf); | |
2720 | ||
2721 | aarch64_emit_call (fn); | |
2722 | ||
2723 | /* Restore x0. */ | |
2724 | aarch64_emit_pop (); | |
2725 | } | |
2726 | ||
2727 | /* Implementation of emit_ops method "emit_eq_goto". */ | |
2728 | ||
2729 | static void | |
2730 | aarch64_emit_eq_goto (int *offset_p, int *size_p) | |
2731 | { | |
2732 | uint32_t buf[16]; | |
2733 | uint32_t *p = buf; | |
2734 | ||
2735 | p += emit_pop (p, x1); | |
2736 | p += emit_cmp (p, x1, register_operand (x0)); | |
2737 | /* Branch over the next instruction if x0 != x1. */ | |
2738 | p += emit_bcond (p, NE, 8); | |
2739 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2740 | if (offset_p) | |
2741 | *offset_p = (p - buf) * 4; | |
2742 | if (size_p) | |
2743 | *size_p = 4; | |
2744 | p += emit_nop (p); | |
2745 | ||
2746 | emit_ops_insns (buf, p - buf); | |
2747 | } | |
2748 | ||
2749 | /* Implementation of emit_ops method "emit_ne_goto". */ | |
2750 | ||
2751 | static void | |
2752 | aarch64_emit_ne_goto (int *offset_p, int *size_p) | |
2753 | { | |
2754 | uint32_t buf[16]; | |
2755 | uint32_t *p = buf; | |
2756 | ||
2757 | p += emit_pop (p, x1); | |
2758 | p += emit_cmp (p, x1, register_operand (x0)); | |
2759 | /* Branch over the next instruction if x0 == x1. */ | |
2760 | p += emit_bcond (p, EQ, 8); | |
2761 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2762 | if (offset_p) | |
2763 | *offset_p = (p - buf) * 4; | |
2764 | if (size_p) | |
2765 | *size_p = 4; | |
2766 | p += emit_nop (p); | |
2767 | ||
2768 | emit_ops_insns (buf, p - buf); | |
2769 | } | |
2770 | ||
2771 | /* Implementation of emit_ops method "emit_lt_goto". */ | |
2772 | ||
2773 | static void | |
2774 | aarch64_emit_lt_goto (int *offset_p, int *size_p) | |
2775 | { | |
2776 | uint32_t buf[16]; | |
2777 | uint32_t *p = buf; | |
2778 | ||
2779 | p += emit_pop (p, x1); | |
2780 | p += emit_cmp (p, x1, register_operand (x0)); | |
2781 | /* Branch over the next instruction if x0 >= x1. */ | |
2782 | p += emit_bcond (p, GE, 8); | |
2783 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2784 | if (offset_p) | |
2785 | *offset_p = (p - buf) * 4; | |
2786 | if (size_p) | |
2787 | *size_p = 4; | |
2788 | p += emit_nop (p); | |
2789 | ||
2790 | emit_ops_insns (buf, p - buf); | |
2791 | } | |
2792 | ||
2793 | /* Implementation of emit_ops method "emit_le_goto". */ | |
2794 | ||
2795 | static void | |
2796 | aarch64_emit_le_goto (int *offset_p, int *size_p) | |
2797 | { | |
2798 | uint32_t buf[16]; | |
2799 | uint32_t *p = buf; | |
2800 | ||
2801 | p += emit_pop (p, x1); | |
2802 | p += emit_cmp (p, x1, register_operand (x0)); | |
2803 | /* Branch over the next instruction if x0 > x1. */ | |
2804 | p += emit_bcond (p, GT, 8); | |
2805 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2806 | if (offset_p) | |
2807 | *offset_p = (p - buf) * 4; | |
2808 | if (size_p) | |
2809 | *size_p = 4; | |
2810 | p += emit_nop (p); | |
2811 | ||
2812 | emit_ops_insns (buf, p - buf); | |
2813 | } | |
2814 | ||
2815 | /* Implementation of emit_ops method "emit_gt_goto". */ | |
2816 | ||
2817 | static void | |
2818 | aarch64_emit_gt_goto (int *offset_p, int *size_p) | |
2819 | { | |
2820 | uint32_t buf[16]; | |
2821 | uint32_t *p = buf; | |
2822 | ||
2823 | p += emit_pop (p, x1); | |
2824 | p += emit_cmp (p, x1, register_operand (x0)); | |
2825 | /* Branch over the next instruction if x0 <= x1. */ | |
2826 | p += emit_bcond (p, LE, 8); | |
2827 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2828 | if (offset_p) | |
2829 | *offset_p = (p - buf) * 4; | |
2830 | if (size_p) | |
2831 | *size_p = 4; | |
2832 | p += emit_nop (p); | |
2833 | ||
2834 | emit_ops_insns (buf, p - buf); | |
2835 | } | |
2836 | ||
2837 | /* Implementation of emit_ops method "emit_ge_got". */ | |
2838 | ||
2839 | static void | |
2840 | aarch64_emit_ge_got (int *offset_p, int *size_p) | |
2841 | { | |
2842 | uint32_t buf[16]; | |
2843 | uint32_t *p = buf; | |
2844 | ||
2845 | p += emit_pop (p, x1); | |
2846 | p += emit_cmp (p, x1, register_operand (x0)); | |
2847 | /* Branch over the next instruction if x0 <= x1. */ | |
2848 | p += emit_bcond (p, LT, 8); | |
2849 | /* The NOP instruction will be patched with an unconditional branch. */ | |
2850 | if (offset_p) | |
2851 | *offset_p = (p - buf) * 4; | |
2852 | if (size_p) | |
2853 | *size_p = 4; | |
2854 | p += emit_nop (p); | |
2855 | ||
2856 | emit_ops_insns (buf, p - buf); | |
2857 | } | |
2858 | ||
2859 | static struct emit_ops aarch64_emit_ops_impl = | |
2860 | { | |
2861 | aarch64_emit_prologue, | |
2862 | aarch64_emit_epilogue, | |
2863 | aarch64_emit_add, | |
2864 | aarch64_emit_sub, | |
2865 | aarch64_emit_mul, | |
2866 | aarch64_emit_lsh, | |
2867 | aarch64_emit_rsh_signed, | |
2868 | aarch64_emit_rsh_unsigned, | |
2869 | aarch64_emit_ext, | |
2870 | aarch64_emit_log_not, | |
2871 | aarch64_emit_bit_and, | |
2872 | aarch64_emit_bit_or, | |
2873 | aarch64_emit_bit_xor, | |
2874 | aarch64_emit_bit_not, | |
2875 | aarch64_emit_equal, | |
2876 | aarch64_emit_less_signed, | |
2877 | aarch64_emit_less_unsigned, | |
2878 | aarch64_emit_ref, | |
2879 | aarch64_emit_if_goto, | |
2880 | aarch64_emit_goto, | |
2881 | aarch64_write_goto_address, | |
2882 | aarch64_emit_const, | |
2883 | aarch64_emit_call, | |
2884 | aarch64_emit_reg, | |
2885 | aarch64_emit_pop, | |
2886 | aarch64_emit_stack_flush, | |
2887 | aarch64_emit_zero_ext, | |
2888 | aarch64_emit_swap, | |
2889 | aarch64_emit_stack_adjust, | |
2890 | aarch64_emit_int_call_1, | |
2891 | aarch64_emit_void_call_2, | |
2892 | aarch64_emit_eq_goto, | |
2893 | aarch64_emit_ne_goto, | |
2894 | aarch64_emit_lt_goto, | |
2895 | aarch64_emit_le_goto, | |
2896 | aarch64_emit_gt_goto, | |
2897 | aarch64_emit_ge_got, | |
2898 | }; | |
2899 | ||
2900 | /* Implementation of linux_target_ops method "emit_ops". */ | |
2901 | ||
2902 | static struct emit_ops * | |
2903 | aarch64_emit_ops (void) | |
2904 | { | |
2905 | return &aarch64_emit_ops_impl; | |
2906 | } | |
2907 | ||
bb903df0 PL |
2908 | /* Implementation of linux_target_ops method |
2909 | "get_min_fast_tracepoint_insn_len". */ | |
2910 | ||
2911 | static int | |
2912 | aarch64_get_min_fast_tracepoint_insn_len (void) | |
2913 | { | |
2914 | return 4; | |
2915 | } | |
2916 | ||
d1d0aea1 PL |
2917 | /* Implementation of linux_target_ops method "supports_range_stepping". */ |
2918 | ||
2919 | static int | |
2920 | aarch64_supports_range_stepping (void) | |
2921 | { | |
2922 | return 1; | |
2923 | } | |
2924 | ||
dd373349 AT |
2925 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
2926 | ||
2927 | static const gdb_byte * | |
2928 | aarch64_sw_breakpoint_from_kind (int kind, int *size) | |
2929 | { | |
17b1509a YQ |
2930 | if (is_64bit_tdesc ()) |
2931 | { | |
2932 | *size = aarch64_breakpoint_len; | |
2933 | return aarch64_breakpoint; | |
2934 | } | |
2935 | else | |
2936 | return arm_sw_breakpoint_from_kind (kind, size); | |
2937 | } | |
2938 | ||
2939 | /* Implementation of linux_target_ops method "breakpoint_kind_from_pc". */ | |
2940 | ||
2941 | static int | |
2942 | aarch64_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
2943 | { | |
2944 | if (is_64bit_tdesc ()) | |
2945 | return aarch64_breakpoint_len; | |
2946 | else | |
2947 | return arm_breakpoint_kind_from_pc (pcptr); | |
2948 | } | |
2949 | ||
2950 | /* Implementation of the linux_target_ops method | |
2951 | "breakpoint_kind_from_current_state". */ | |
2952 | ||
2953 | static int | |
2954 | aarch64_breakpoint_kind_from_current_state (CORE_ADDR *pcptr) | |
2955 | { | |
2956 | if (is_64bit_tdesc ()) | |
2957 | return aarch64_breakpoint_len; | |
2958 | else | |
2959 | return arm_breakpoint_kind_from_current_state (pcptr); | |
dd373349 AT |
2960 | } |
2961 | ||
7d00775e AT |
2962 | /* Support for hardware single step. */ |
2963 | ||
2964 | static int | |
2965 | aarch64_supports_hardware_single_step (void) | |
2966 | { | |
2967 | return 1; | |
2968 | } | |
2969 | ||
176eb98c MS |
2970 | struct linux_target_ops the_low_target = |
2971 | { | |
2972 | aarch64_arch_setup, | |
3aee8918 | 2973 | aarch64_regs_info, |
176eb98c MS |
2974 | aarch64_cannot_fetch_register, |
2975 | aarch64_cannot_store_register, | |
421530db | 2976 | NULL, /* fetch_register */ |
176eb98c MS |
2977 | aarch64_get_pc, |
2978 | aarch64_set_pc, | |
17b1509a | 2979 | aarch64_breakpoint_kind_from_pc, |
dd373349 | 2980 | aarch64_sw_breakpoint_from_kind, |
fa5308bd | 2981 | NULL, /* get_next_pcs */ |
421530db | 2982 | 0, /* decr_pc_after_break */ |
176eb98c | 2983 | aarch64_breakpoint_at, |
802e8e6d | 2984 | aarch64_supports_z_point_type, |
176eb98c MS |
2985 | aarch64_insert_point, |
2986 | aarch64_remove_point, | |
2987 | aarch64_stopped_by_watchpoint, | |
2988 | aarch64_stopped_data_address, | |
421530db PL |
2989 | NULL, /* collect_ptrace_register */ |
2990 | NULL, /* supply_ptrace_register */ | |
ade90bde | 2991 | aarch64_linux_siginfo_fixup, |
176eb98c MS |
2992 | aarch64_linux_new_process, |
2993 | aarch64_linux_new_thread, | |
3a8a0396 | 2994 | aarch64_linux_new_fork, |
176eb98c | 2995 | aarch64_linux_prepare_to_resume, |
421530db | 2996 | NULL, /* process_qsupported */ |
7671bf47 | 2997 | aarch64_supports_tracepoints, |
bb903df0 PL |
2998 | aarch64_get_thread_area, |
2999 | aarch64_install_fast_tracepoint_jump_pad, | |
afbe19f8 | 3000 | aarch64_emit_ops, |
bb903df0 | 3001 | aarch64_get_min_fast_tracepoint_insn_len, |
d1d0aea1 | 3002 | aarch64_supports_range_stepping, |
17b1509a | 3003 | aarch64_breakpoint_kind_from_current_state, |
7d00775e | 3004 | aarch64_supports_hardware_single_step, |
061fc021 | 3005 | aarch64_get_syscall_trapinfo, |
176eb98c | 3006 | }; |
3aee8918 PA |
3007 | |
3008 | void | |
3009 | initialize_low_arch (void) | |
3010 | { | |
3011 | init_registers_aarch64 (); | |
3012 | ||
3b53ae99 YQ |
3013 | initialize_low_arch_aarch32 (); |
3014 | ||
3aee8918 PA |
3015 | initialize_regsets_info (&aarch64_regsets_info); |
3016 | } |