1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * Copyright (C) 2008 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
8 * Copyright (C) 2008 by Oyvind Harboe *
9 * oyvind.harboe@zylin.com *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
33 #include "breakpoints.h"
34 #include "arm_disassembler.h"
35 #include <helper/binarybuffer.h>
36 #include "algorithm.h"
40 /* offsets into armv4_5 core register cache */
43 ARMV4_5_SPSR_FIQ
= 32,
44 ARMV4_5_SPSR_IRQ
= 33,
45 ARMV4_5_SPSR_SVC
= 34,
46 ARMV4_5_SPSR_ABT
= 35,
47 ARMV4_5_SPSR_UND
= 36,
51 static const uint8_t arm_usr_indices
[17] = {
52 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, ARMV4_5_CPSR
,
55 static const uint8_t arm_fiq_indices
[8] = {
56 16, 17, 18, 19, 20, 21, 22, ARMV4_5_SPSR_FIQ
,
59 static const uint8_t arm_irq_indices
[3] = {
60 23, 24, ARMV4_5_SPSR_IRQ
,
63 static const uint8_t arm_svc_indices
[3] = {
64 25, 26, ARMV4_5_SPSR_SVC
,
67 static const uint8_t arm_abt_indices
[3] = {
68 27, 28, ARMV4_5_SPSR_ABT
,
71 static const uint8_t arm_und_indices
[3] = {
72 29, 30, ARMV4_5_SPSR_UND
,
75 static const uint8_t arm_mon_indices
[3] = {
82 /* For user and system modes, these list indices for all registers.
83 * otherwise they're just indices for the shadow registers and SPSR.
85 unsigned short n_indices
;
86 const uint8_t *indices
;
88 /* Seven modes are standard from ARM7 on. "System" and "User" share
89 * the same registers; other modes shadow from 3 to 8 registers.
94 .n_indices
= ARRAY_SIZE(arm_usr_indices
),
95 .indices
= arm_usr_indices
,
100 .n_indices
= ARRAY_SIZE(arm_fiq_indices
),
101 .indices
= arm_fiq_indices
,
104 .name
= "Supervisor",
106 .n_indices
= ARRAY_SIZE(arm_svc_indices
),
107 .indices
= arm_svc_indices
,
112 .n_indices
= ARRAY_SIZE(arm_abt_indices
),
113 .indices
= arm_abt_indices
,
118 .n_indices
= ARRAY_SIZE(arm_irq_indices
),
119 .indices
= arm_irq_indices
,
122 .name
= "Undefined instruction",
124 .n_indices
= ARRAY_SIZE(arm_und_indices
),
125 .indices
= arm_und_indices
,
130 .n_indices
= ARRAY_SIZE(arm_usr_indices
),
131 .indices
= arm_usr_indices
,
133 /* TrustZone "Security Extensions" add a secure monitor mode.
134 * This is distinct from a "debug monitor" which can support
135 * non-halting debug, in conjunction with some debuggers.
138 .name
= "Secure Monitor",
140 .n_indices
= ARRAY_SIZE(arm_mon_indices
),
141 .indices
= arm_mon_indices
,
145 /** Map PSR mode bits to the name of an ARM processor operating mode. */
146 const char *arm_mode_name(unsigned psr_mode
)
148 for (unsigned i
= 0; i
< ARRAY_SIZE(arm_mode_data
); i
++) {
149 if (arm_mode_data
[i
].psr
== psr_mode
)
150 return arm_mode_data
[i
].name
;
152 LOG_ERROR("unrecognized psr mode: %#02x", psr_mode
);
153 return "UNRECOGNIZED";
156 /** Return true iff the parameter denotes a valid ARM processor mode. */
157 bool is_arm_mode(unsigned psr_mode
)
159 for (unsigned i
= 0; i
< ARRAY_SIZE(arm_mode_data
); i
++) {
160 if (arm_mode_data
[i
].psr
== psr_mode
)
166 /** Map PSR mode bits to linear number indexing armv4_5_core_reg_map */
167 int arm_mode_to_number(enum arm_mode mode
)
171 /* map MODE_ANY to user mode */
189 LOG_ERROR("invalid mode value encountered %d", mode
);
194 /** Map linear number indexing armv4_5_core_reg_map to PSR mode bits. */
195 enum arm_mode
armv4_5_number_to_mode(int number
)
215 LOG_ERROR("mode index out of bounds %d", number
);
220 const char *arm_state_strings
[] =
222 "ARM", "Thumb", "Jazelle", "ThumbEE",
225 /* Templates for ARM core registers.
227 * NOTE: offsets in this table are coupled to the arm_mode_data
228 * table above, the armv4_5_core_reg_map array below, and also to
229 * the ARMV4_5_CPSR symbol (which should vanish after ARM11 updates).
231 static const struct {
232 /* The name is used for e.g. the "regs" command. */
235 /* The {cookie, mode} tuple uniquely identifies one register.
236 * In a given mode, cookies 0..15 map to registers R0..R15,
237 * with R13..R15 usually called SP, LR, PC.
239 * MODE_ANY is used as *input* to the mapping, and indicates
240 * various special cases (sigh) and errors.
242 * Cookie 16 is (currently) confusing, since it indicates
243 * CPSR -or- SPSR depending on whether 'mode' is MODE_ANY.
244 * (Exception modes have both CPSR and SPSR registers ...)
248 } arm_core_regs
[] = {
249 /* IMPORTANT: we guarantee that the first eight cached registers
250 * correspond to r0..r7, and the fifteenth to PC, so that callers
251 * don't need to map them.
253 { .name
= "r0", .cookie
= 0, .mode
= ARM_MODE_ANY
, },
254 { .name
= "r1", .cookie
= 1, .mode
= ARM_MODE_ANY
, },
255 { .name
= "r2", .cookie
= 2, .mode
= ARM_MODE_ANY
, },
256 { .name
= "r3", .cookie
= 3, .mode
= ARM_MODE_ANY
, },
257 { .name
= "r4", .cookie
= 4, .mode
= ARM_MODE_ANY
, },
258 { .name
= "r5", .cookie
= 5, .mode
= ARM_MODE_ANY
, },
259 { .name
= "r6", .cookie
= 6, .mode
= ARM_MODE_ANY
, },
260 { .name
= "r7", .cookie
= 7, .mode
= ARM_MODE_ANY
, },
262 /* NOTE: regs 8..12 might be shadowed by FIQ ... flagging
263 * them as MODE_ANY creates special cases. (ANY means
264 * "not mapped" elsewhere; here it's "everything but FIQ".)
266 { .name
= "r8", .cookie
= 8, .mode
= ARM_MODE_ANY
, },
267 { .name
= "r9", .cookie
= 9, .mode
= ARM_MODE_ANY
, },
268 { .name
= "r10", .cookie
= 10, .mode
= ARM_MODE_ANY
, },
269 { .name
= "r11", .cookie
= 11, .mode
= ARM_MODE_ANY
, },
270 { .name
= "r12", .cookie
= 12, .mode
= ARM_MODE_ANY
, },
272 /* NOTE all MODE_USR registers are equivalent to MODE_SYS ones */
273 { .name
= "sp_usr", .cookie
= 13, .mode
= ARM_MODE_USR
, },
274 { .name
= "lr_usr", .cookie
= 14, .mode
= ARM_MODE_USR
, },
276 /* guaranteed to be at index 15 */
277 { .name
= "pc", .cookie
= 15, .mode
= ARM_MODE_ANY
, },
279 { .name
= "r8_fiq", .cookie
= 8, .mode
= ARM_MODE_FIQ
, },
280 { .name
= "r9_fiq", .cookie
= 9, .mode
= ARM_MODE_FIQ
, },
281 { .name
= "r10_fiq", .cookie
= 10, .mode
= ARM_MODE_FIQ
, },
282 { .name
= "r11_fiq", .cookie
= 11, .mode
= ARM_MODE_FIQ
, },
283 { .name
= "r12_fiq", .cookie
= 12, .mode
= ARM_MODE_FIQ
, },
285 { .name
= "sp_fiq", .cookie
= 13, .mode
= ARM_MODE_FIQ
, },
286 { .name
= "lr_fiq", .cookie
= 14, .mode
= ARM_MODE_FIQ
, },
288 { .name
= "sp_irq", .cookie
= 13, .mode
= ARM_MODE_IRQ
, },
289 { .name
= "lr_irq", .cookie
= 14, .mode
= ARM_MODE_IRQ
, },
291 { .name
= "sp_svc", .cookie
= 13, .mode
= ARM_MODE_SVC
, },
292 { .name
= "lr_svc", .cookie
= 14, .mode
= ARM_MODE_SVC
, },
294 { .name
= "sp_abt", .cookie
= 13, .mode
= ARM_MODE_ABT
, },
295 { .name
= "lr_abt", .cookie
= 14, .mode
= ARM_MODE_ABT
, },
297 { .name
= "sp_und", .cookie
= 13, .mode
= ARM_MODE_UND
, },
298 { .name
= "lr_und", .cookie
= 14, .mode
= ARM_MODE_UND
, },
300 { .name
= "cpsr", .cookie
= 16, .mode
= ARM_MODE_ANY
, },
301 { .name
= "spsr_fiq", .cookie
= 16, .mode
= ARM_MODE_FIQ
, },
302 { .name
= "spsr_irq", .cookie
= 16, .mode
= ARM_MODE_IRQ
, },
303 { .name
= "spsr_svc", .cookie
= 16, .mode
= ARM_MODE_SVC
, },
304 { .name
= "spsr_abt", .cookie
= 16, .mode
= ARM_MODE_ABT
, },
305 { .name
= "spsr_und", .cookie
= 16, .mode
= ARM_MODE_UND
, },
307 { .name
= "sp_mon", .cookie
= 13, .mode
= ARM_MODE_MON
, },
308 { .name
= "lr_mon", .cookie
= 14, .mode
= ARM_MODE_MON
, },
309 { .name
= "spsr_mon", .cookie
= 16, .mode
= ARM_MODE_MON
, },
312 /* map core mode (USR, FIQ, ...) and register number to
313 * indices into the register cache
315 const int armv4_5_core_reg_map
[8][17] =
318 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
320 { /* FIQ (8 shadows of USR, vs normal 3) */
321 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, 15, 32
324 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, 24, 15, 33
327 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26, 15, 34
330 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27, 28, 15, 35
333 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 29, 30, 15, 36
335 { /* SYS (same registers as USR) */
336 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31
339 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 37, 38, 15, 39,
344 * Configures host-side ARM records to reflect the specified CPSR.
345 * Later, code can use arm_reg_current() to map register numbers
346 * according to how they are exposed by this mode.
348 void arm_set_cpsr(struct arm
*arm
, uint32_t cpsr
)
350 enum arm_mode mode
= cpsr
& 0x1f;
353 /* NOTE: this may be called very early, before the register
354 * cache is set up. We can't defend against many errors, in
355 * particular against CPSRs that aren't valid *here* ...
358 buf_set_u32(arm
->cpsr
->value
, 0, 32, cpsr
);
359 arm
->cpsr
->valid
= 1;
360 arm
->cpsr
->dirty
= 0;
363 arm
->core_mode
= mode
;
365 /* mode_to_number() warned; set up a somewhat-sane mapping */
366 num
= arm_mode_to_number(mode
);
372 arm
->map
= &armv4_5_core_reg_map
[num
][0];
373 arm
->spsr
= (mode
== ARM_MODE_USR
|| mode
== ARM_MODE_SYS
)
375 : arm
->core_cache
->reg_list
+ arm
->map
[16];
377 /* Older ARMs won't have the J bit */
378 enum arm_state state
;
380 if (cpsr
& (1 << 5)) { /* T */
381 if (cpsr
& (1 << 24)) { /* J */
382 LOG_WARNING("ThumbEE -- incomplete support");
383 state
= ARM_STATE_THUMB_EE
;
385 state
= ARM_STATE_THUMB
;
387 if (cpsr
& (1 << 24)) { /* J */
388 LOG_ERROR("Jazelle state handling is BROKEN!");
389 state
= ARM_STATE_JAZELLE
;
391 state
= ARM_STATE_ARM
;
393 arm
->core_state
= state
;
395 LOG_DEBUG("set CPSR %#8.8x: %s mode, %s state", (unsigned) cpsr
,
397 arm_state_strings
[arm
->core_state
]);
401 * Returns handle to the register currently mapped to a given number.
402 * Someone must have called arm_set_cpsr() before.
404 * \param arm This core's state and registers are used.
405 * \param regnum From 0..15 corresponding to R0..R14 and PC.
406 * Note that R0..R7 don't require mapping; you may access those
407 * as the first eight entries in the register cache. Likewise
408 * R15 (PC) doesn't need mapping; you may also access it directly.
409 * However, R8..R14, and SPSR (arm->spsr) *must* be mapped.
410 * CPSR (arm->cpsr) is also not mapped.
412 struct reg
*arm_reg_current(struct arm
*arm
, unsigned regnum
)
419 r
= arm
->core_cache
->reg_list
+ arm
->map
[regnum
];
421 /* e.g. invalid CPSR said "secure monitor" mode on a core
422 * that doesn't support it...
425 LOG_ERROR("Invalid CPSR mode");
426 r
= arm
->core_cache
->reg_list
+ regnum
;
432 static const uint8_t arm_gdb_dummy_fp_value
[12];
435 * Dummy FPA registers are required to support GDB on ARM.
436 * Register packets require eight obsolete FPA register values.
437 * Modern ARM cores use Vector Floating Point (VFP), if they
438 * have any floating point support. VFP is not FPA-compatible.
440 struct reg arm_gdb_dummy_fp_reg
=
442 .name
= "GDB dummy FPA register",
443 .value
= (uint8_t *) arm_gdb_dummy_fp_value
,
448 static const uint8_t arm_gdb_dummy_fps_value
[4];
451 * Dummy FPA status registers are required to support GDB on ARM.
452 * Register packets require an obsolete FPA status register.
454 struct reg arm_gdb_dummy_fps_reg
=
456 .name
= "GDB dummy FPA status register",
457 .value
= (uint8_t *) arm_gdb_dummy_fps_value
,
462 static void arm_gdb_dummy_init(void) __attribute__ ((constructor
));
464 static void arm_gdb_dummy_init(void)
466 register_init_dummy(&arm_gdb_dummy_fp_reg
);
467 register_init_dummy(&arm_gdb_dummy_fps_reg
);
470 static int armv4_5_get_core_reg(struct reg
*reg
)
473 struct arm_reg
*armv4_5
= reg
->arch_info
;
474 struct target
*target
= armv4_5
->target
;
476 if (target
->state
!= TARGET_HALTED
)
478 LOG_ERROR("Target not halted");
479 return ERROR_TARGET_NOT_HALTED
;
482 retval
= armv4_5
->armv4_5_common
->read_core_reg(target
, reg
, armv4_5
->num
, armv4_5
->mode
);
483 if (retval
== ERROR_OK
) {
491 static int armv4_5_set_core_reg(struct reg
*reg
, uint8_t *buf
)
493 struct arm_reg
*armv4_5
= reg
->arch_info
;
494 struct target
*target
= armv4_5
->target
;
495 struct arm
*armv4_5_target
= target_to_arm(target
);
496 uint32_t value
= buf_get_u32(buf
, 0, 32);
498 if (target
->state
!= TARGET_HALTED
)
500 LOG_ERROR("Target not halted");
501 return ERROR_TARGET_NOT_HALTED
;
504 /* Except for CPSR, the "reg" command exposes a writeback model
505 * for the register cache.
507 if (reg
== armv4_5_target
->cpsr
) {
508 arm_set_cpsr(armv4_5_target
, value
);
510 /* Older cores need help to be in ARM mode during halt
511 * mode debug, so we clear the J and T bits if we flush.
512 * For newer cores (v6/v7a/v7r) we don't need that, but
513 * it won't hurt since CPSR is always flushed anyway.
515 if (armv4_5_target
->core_mode
!=
516 (enum arm_mode
)(value
& 0x1f)) {
517 LOG_DEBUG("changing ARM core mode to '%s'",
518 arm_mode_name(value
& 0x1f));
519 value
&= ~((1 << 24) | (1 << 5));
520 armv4_5_target
->write_core_reg(target
, reg
,
521 16, ARM_MODE_ANY
, value
);
524 buf_set_u32(reg
->value
, 0, 32, value
);
532 static const struct reg_arch_type arm_reg_type
= {
533 .get
= armv4_5_get_core_reg
,
534 .set
= armv4_5_set_core_reg
,
537 struct reg_cache
*arm_build_reg_cache(struct target
*target
, struct arm
*arm
)
539 int num_regs
= ARRAY_SIZE(arm_core_regs
);
540 struct reg_cache
*cache
= malloc(sizeof(struct reg_cache
));
541 struct reg
*reg_list
= calloc(num_regs
, sizeof(struct reg
));
542 struct arm_reg
*arch_info
= calloc(num_regs
, sizeof(struct arm_reg
));
545 if (!cache
|| !reg_list
|| !arch_info
) {
552 cache
->name
= "ARM registers";
554 cache
->reg_list
= reg_list
;
557 for (i
= 0; i
< num_regs
; i
++)
559 /* Skip registers this core doesn't expose */
560 if (arm_core_regs
[i
].mode
== ARM_MODE_MON
561 && arm
->core_type
!= ARM_MODE_MON
)
564 /* REVISIT handle Cortex-M, which only shadows R13/SP */
566 arch_info
[i
].num
= arm_core_regs
[i
].cookie
;
567 arch_info
[i
].mode
= arm_core_regs
[i
].mode
;
568 arch_info
[i
].target
= target
;
569 arch_info
[i
].armv4_5_common
= arm
;
571 reg_list
[i
].name
= (char *) arm_core_regs
[i
].name
;
572 reg_list
[i
].size
= 32;
573 reg_list
[i
].value
= &arch_info
[i
].value
;
574 reg_list
[i
].type
= &arm_reg_type
;
575 reg_list
[i
].arch_info
= &arch_info
[i
];
580 arm
->pc
= reg_list
+ 15;
581 arm
->cpsr
= reg_list
+ ARMV4_5_CPSR
;
582 arm
->core_cache
= cache
;
586 int arm_arch_state(struct target
*target
)
588 struct arm
*armv4_5
= target_to_arm(target
);
590 if (armv4_5
->common_magic
!= ARM_COMMON_MAGIC
)
592 LOG_ERROR("BUG: called for a non-ARM target");
596 LOG_USER("target halted in %s state due to %s, current mode: %s\n"
597 "cpsr: 0x%8.8" PRIx32
" pc: 0x%8.8" PRIx32
"%s",
598 arm_state_strings
[armv4_5
->core_state
],
599 debug_reason_name(target
),
600 arm_mode_name(armv4_5
->core_mode
),
601 buf_get_u32(armv4_5
->cpsr
->value
, 0, 32),
602 buf_get_u32(armv4_5
->pc
->value
, 0, 32),
603 armv4_5
->is_semihosting
? ", semihosting" : "");
608 #define ARMV4_5_CORE_REG_MODENUM(cache, mode, num) \
609 cache->reg_list[armv4_5_core_reg_map[mode][num]]
611 COMMAND_HANDLER(handle_armv4_5_reg_command
)
613 struct target
*target
= get_current_target(CMD_CTX
);
614 struct arm
*armv4_5
= target_to_arm(target
);
618 if (!is_arm(armv4_5
))
620 command_print(CMD_CTX
, "current target isn't an ARM");
624 if (target
->state
!= TARGET_HALTED
)
626 command_print(CMD_CTX
, "error: target must be halted for register accesses");
630 if (armv4_5
->core_type
!= ARM_MODE_ANY
)
632 command_print(CMD_CTX
, "Microcontroller Profile not supported - use standard reg cmd");
636 if (!is_arm_mode(armv4_5
->core_mode
))
639 if (!armv4_5
->full_context
) {
640 command_print(CMD_CTX
, "error: target doesn't support %s",
645 num_regs
= armv4_5
->core_cache
->num_regs
;
646 regs
= armv4_5
->core_cache
->reg_list
;
648 for (unsigned mode
= 0; mode
< ARRAY_SIZE(arm_mode_data
); mode
++) {
653 /* label this bank of registers (or shadows) */
654 switch (arm_mode_data
[mode
].psr
) {
658 name
= "System and User";
662 if (armv4_5
->core_type
!= ARM_MODE_MON
)
666 name
= arm_mode_data
[mode
].name
;
670 command_print(CMD_CTX
, "%s%s mode %sregisters",
673 /* display N rows of up to 4 registers each */
674 for (unsigned i
= 0; i
< arm_mode_data
[mode
].n_indices
;) {
678 for (unsigned j
= 0; j
< 4; j
++, i
++) {
680 struct reg
*reg
= regs
;
682 if (i
>= arm_mode_data
[mode
].n_indices
)
685 reg
+= arm_mode_data
[mode
].indices
[i
];
687 /* REVISIT be smarter about faults... */
689 armv4_5
->full_context(target
);
691 value
= buf_get_u32(reg
->value
, 0, 32);
692 output_len
+= snprintf(output
+ output_len
,
693 sizeof(output
) - output_len
,
694 "%8s: %8.8" PRIx32
" ",
697 command_print(CMD_CTX
, "%s", output
);
704 COMMAND_HANDLER(handle_armv4_5_core_state_command
)
706 struct target
*target
= get_current_target(CMD_CTX
);
707 struct arm
*armv4_5
= target_to_arm(target
);
709 if (!is_arm(armv4_5
))
711 command_print(CMD_CTX
, "current target isn't an ARM");
715 if (armv4_5
->core_type
== ARM_MODE_THREAD
)
717 /* armv7m not supported */
718 command_print(CMD_CTX
, "Unsupported Command");
724 if (strcmp(CMD_ARGV
[0], "arm") == 0)
726 armv4_5
->core_state
= ARM_STATE_ARM
;
728 if (strcmp(CMD_ARGV
[0], "thumb") == 0)
730 armv4_5
->core_state
= ARM_STATE_THUMB
;
734 command_print(CMD_CTX
, "core state: %s", arm_state_strings
[armv4_5
->core_state
]);
739 COMMAND_HANDLER(handle_arm_disassemble_command
)
741 int retval
= ERROR_OK
;
742 struct target
*target
= get_current_target(CMD_CTX
);
743 struct arm
*arm
= target
? target_to_arm(target
) : NULL
;
749 command_print(CMD_CTX
, "current target isn't an ARM");
753 if (arm
->core_type
== ARM_MODE_THREAD
)
755 /* armv7m is always thumb mode */
761 if (strcmp(CMD_ARGV
[2], "thumb") != 0)
766 COMMAND_PARSE_NUMBER(int, CMD_ARGV
[1], count
);
769 COMMAND_PARSE_NUMBER(u32
, CMD_ARGV
[0], address
);
770 if (address
& 0x01) {
772 command_print(CMD_CTX
, "Disassemble as Thumb");
780 command_print(CMD_CTX
,
781 "usage: arm disassemble <address> [<count> ['thumb']]");
786 while (count
-- > 0) {
787 struct arm_instruction cur_instruction
;
790 /* Always use Thumb2 disassembly for best handling
791 * of 32-bit BL/BLX, and to work with newer cores
792 * (some ARMv6, all ARMv7) that use Thumb2.
794 retval
= thumb2_opcode(target
, address
,
796 if (retval
!= ERROR_OK
)
801 retval
= target_read_u32(target
, address
, &opcode
);
802 if (retval
!= ERROR_OK
)
804 retval
= arm_evaluate_opcode(opcode
, address
,
805 &cur_instruction
) != ERROR_OK
;
806 if (retval
!= ERROR_OK
)
809 command_print(CMD_CTX
, "%s", cur_instruction
.text
);
810 address
+= cur_instruction
.instruction_size
;
816 static int jim_mcrmrc(Jim_Interp
*interp
, int argc
, Jim_Obj
*const *argv
)
818 struct command_context
*context
;
819 struct target
*target
;
823 context
= Jim_GetAssocData(interp
, "context");
824 if (context
== NULL
) {
825 LOG_ERROR("%s: no command context", __func__
);
828 target
= get_current_target(context
);
829 if (target
== NULL
) {
830 LOG_ERROR("%s: no current target", __func__
);
833 if (!target_was_examined(target
)) {
834 LOG_ERROR("%s: not yet examined", target_name(target
));
837 arm
= target_to_arm(target
);
839 LOG_ERROR("%s: not an ARM", target_name(target
));
843 if (arm
->core_type
== ARM_MODE_THREAD
)
845 /* armv7m not supported */
846 LOG_ERROR("Unsupported Command");
850 if ((argc
< 6) || (argc
> 7)) {
851 /* FIXME use the command name to verify # params... */
852 LOG_ERROR("%s: wrong number of arguments", __func__
);
864 /* NOTE: parameter sequence matches ARM instruction set usage:
865 * MCR pNUM, op1, rX, CRn, CRm, op2 ; write CP from rX
866 * MRC pNUM, op1, rX, CRn, CRm, op2 ; read CP into rX
867 * The "rX" is necessarily omitted; it uses Tcl mechanisms.
869 retval
= Jim_GetLong(interp
, argv
[1], &l
);
870 if (retval
!= JIM_OK
)
873 LOG_ERROR("%s: %s %d out of range", __func__
,
874 "coprocessor", (int) l
);
879 retval
= Jim_GetLong(interp
, argv
[2], &l
);
880 if (retval
!= JIM_OK
)
883 LOG_ERROR("%s: %s %d out of range", __func__
,
889 retval
= Jim_GetLong(interp
, argv
[3], &l
);
890 if (retval
!= JIM_OK
)
893 LOG_ERROR("%s: %s %d out of range", __func__
,
899 retval
= Jim_GetLong(interp
, argv
[4], &l
);
900 if (retval
!= JIM_OK
)
903 LOG_ERROR("%s: %s %d out of range", __func__
,
909 retval
= Jim_GetLong(interp
, argv
[5], &l
);
910 if (retval
!= JIM_OK
)
913 LOG_ERROR("%s: %s %d out of range", __func__
,
921 /* FIXME don't assume "mrc" vs "mcr" from the number of params;
922 * that could easily be a typo! Check both...
924 * FIXME change the call syntax here ... simplest to just pass
925 * the MRC() or MCR() instruction to be executed. That will also
926 * let us support the "mrc2" and "mcr2" opcodes (toggling one bit)
927 * if that's ever needed.
930 retval
= Jim_GetLong(interp
, argv
[6], &l
);
931 if (retval
!= JIM_OK
) {
936 /* NOTE: parameters reordered! */
937 // ARMV4_5_MCR(cpnum, op1, 0, CRn, CRm, op2)
938 retval
= arm
->mcr(target
, cpnum
, op1
, op2
, CRn
, CRm
, value
);
939 if (retval
!= ERROR_OK
)
942 /* NOTE: parameters reordered! */
943 // ARMV4_5_MRC(cpnum, op1, 0, CRn, CRm, op2)
944 retval
= arm
->mrc(target
, cpnum
, op1
, op2
, CRn
, CRm
, &value
);
945 if (retval
!= ERROR_OK
)
948 Jim_SetResult(interp
, Jim_NewIntObj(interp
, value
));
954 COMMAND_HANDLER(handle_arm_semihosting_command
)
956 struct target
*target
= get_current_target(CMD_CTX
);
957 struct arm
*arm
= target
? target_to_arm(target
) : NULL
;
960 command_print(CMD_CTX
, "current target isn't an ARM");
964 if (!arm
->setup_semihosting
)
966 command_print(CMD_CTX
, "semihosting not supported for current target");
973 COMMAND_PARSE_ENABLE(CMD_ARGV
[0], semihosting
);
975 if (!target_was_examined(target
))
977 LOG_ERROR("Target not examined yet");
981 if (arm
->setup_semihosting(target
, semihosting
) != ERROR_OK
) {
982 LOG_ERROR("Failed to Configure semihosting");
986 /* FIXME never let that "catch" be dropped! */
987 arm
->is_semihosting
= semihosting
;
990 command_print(CMD_CTX
, "semihosting is %s",
992 ? "enabled" : "disabled");
997 static const struct command_registration arm_exec_command_handlers
[] = {
1000 .handler
= handle_armv4_5_reg_command
,
1001 .mode
= COMMAND_EXEC
,
1002 .help
= "display ARM core registers",
1005 .name
= "core_state",
1006 .handler
= handle_armv4_5_core_state_command
,
1007 .mode
= COMMAND_EXEC
,
1008 .usage
= "['arm'|'thumb']",
1009 .help
= "display/change ARM core state",
1012 .name
= "disassemble",
1013 .handler
= handle_arm_disassemble_command
,
1014 .mode
= COMMAND_EXEC
,
1015 .usage
= "address [count ['thumb']]",
1016 .help
= "disassemble instructions ",
1020 .mode
= COMMAND_EXEC
,
1021 .jim_handler
= &jim_mcrmrc
,
1022 .help
= "write coprocessor register",
1023 .usage
= "cpnum op1 CRn op2 CRm value",
1027 .jim_handler
= &jim_mcrmrc
,
1028 .help
= "read coprocessor register",
1029 .usage
= "cpnum op1 CRn op2 CRm",
1033 .handler
= handle_arm_semihosting_command
,
1034 .mode
= COMMAND_EXEC
,
1035 .usage
= "['enable'|'disable']",
1036 .help
= "activate support for semihosting operations",
1039 COMMAND_REGISTRATION_DONE
1041 const struct command_registration arm_command_handlers
[] = {
1044 .mode
= COMMAND_ANY
,
1045 .help
= "ARM command group",
1046 .chain
= arm_exec_command_handlers
,
1048 COMMAND_REGISTRATION_DONE
1051 int arm_get_gdb_reg_list(struct target
*target
,
1052 struct reg
**reg_list
[], int *reg_list_size
)
1054 struct arm
*armv4_5
= target_to_arm(target
);
1057 if (!is_arm_mode(armv4_5
->core_mode
))
1060 *reg_list_size
= 26;
1061 *reg_list
= malloc(sizeof(struct reg
*) * (*reg_list_size
));
1063 for (i
= 0; i
< 16; i
++)
1064 (*reg_list
)[i
] = arm_reg_current(armv4_5
, i
);
1066 for (i
= 16; i
< 24; i
++)
1067 (*reg_list
)[i
] = &arm_gdb_dummy_fp_reg
;
1069 (*reg_list
)[24] = &arm_gdb_dummy_fps_reg
;
1070 (*reg_list
)[25] = armv4_5
->cpsr
;
1075 /* wait for execution to complete and check exit point */
1076 static int armv4_5_run_algorithm_completion(struct target
*target
, uint32_t exit_point
, int timeout_ms
, void *arch_info
)
1079 struct arm
*armv4_5
= target_to_arm(target
);
1081 if ((retval
= target_wait_state(target
, TARGET_HALTED
, timeout_ms
)) != ERROR_OK
)
1085 if (target
->state
!= TARGET_HALTED
)
1087 if ((retval
= target_halt(target
)) != ERROR_OK
)
1089 if ((retval
= target_wait_state(target
, TARGET_HALTED
, 500)) != ERROR_OK
)
1093 return ERROR_TARGET_TIMEOUT
;
1096 /* fast exit: ARMv5+ code can use BKPT */
1097 if (exit_point
&& buf_get_u32(armv4_5
->pc
->value
, 0, 32) != exit_point
)
1099 LOG_WARNING("target reentered debug state, but not at the desired exit point: 0x%4.4" PRIx32
"",
1100 buf_get_u32(armv4_5
->pc
->value
, 0, 32));
1101 return ERROR_TARGET_TIMEOUT
;
1107 int armv4_5_run_algorithm_inner(struct target
*target
,
1108 int num_mem_params
, struct mem_param
*mem_params
,
1109 int num_reg_params
, struct reg_param
*reg_params
,
1110 uint32_t entry_point
, uint32_t exit_point
,
1111 int timeout_ms
, void *arch_info
,
1112 int (*run_it
)(struct target
*target
, uint32_t exit_point
,
1113 int timeout_ms
, void *arch_info
))
1115 struct arm
*armv4_5
= target_to_arm(target
);
1116 struct arm_algorithm
*arm_algorithm_info
= arch_info
;
1117 enum arm_state core_state
= armv4_5
->core_state
;
1118 uint32_t context
[17];
1120 int exit_breakpoint_size
= 0;
1122 int retval
= ERROR_OK
;
1124 LOG_DEBUG("Running algorithm");
1126 if (arm_algorithm_info
->common_magic
!= ARM_COMMON_MAGIC
)
1128 LOG_ERROR("current target isn't an ARMV4/5 target");
1129 return ERROR_TARGET_INVALID
;
1132 if (target
->state
!= TARGET_HALTED
)
1134 LOG_WARNING("target not halted");
1135 return ERROR_TARGET_NOT_HALTED
;
1138 if (!is_arm_mode(armv4_5
->core_mode
))
1141 /* armv5 and later can terminate with BKPT instruction; less overhead */
1142 if (!exit_point
&& armv4_5
->is_armv4
)
1144 LOG_ERROR("ARMv4 target needs HW breakpoint location");
1148 /* save r0..pc, cpsr-or-spsr, and then cpsr-for-sure;
1149 * they'll be restored later.
1151 for (i
= 0; i
<= 16; i
++)
1155 r
= &ARMV4_5_CORE_REG_MODE(armv4_5
->core_cache
,
1156 arm_algorithm_info
->core_mode
, i
);
1158 armv4_5
->read_core_reg(target
, r
, i
,
1159 arm_algorithm_info
->core_mode
);
1160 context
[i
] = buf_get_u32(r
->value
, 0, 32);
1162 cpsr
= buf_get_u32(armv4_5
->cpsr
->value
, 0, 32);
1164 for (i
= 0; i
< num_mem_params
; i
++)
1166 if ((retval
= target_write_buffer(target
, mem_params
[i
].address
, mem_params
[i
].size
, mem_params
[i
].value
)) != ERROR_OK
)
1172 for (i
= 0; i
< num_reg_params
; i
++)
1174 struct reg
*reg
= register_get_by_name(armv4_5
->core_cache
, reg_params
[i
].reg_name
, 0);
1177 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
1178 return ERROR_INVALID_ARGUMENTS
;
1181 if (reg
->size
!= reg_params
[i
].size
)
1183 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params
[i
].reg_name
);
1184 return ERROR_INVALID_ARGUMENTS
;
1187 if ((retval
= armv4_5_set_core_reg(reg
, reg_params
[i
].value
)) != ERROR_OK
)
1193 armv4_5
->core_state
= arm_algorithm_info
->core_state
;
1194 if (armv4_5
->core_state
== ARM_STATE_ARM
)
1195 exit_breakpoint_size
= 4;
1196 else if (armv4_5
->core_state
== ARM_STATE_THUMB
)
1197 exit_breakpoint_size
= 2;
1200 LOG_ERROR("BUG: can't execute algorithms when not in ARM or Thumb state");
1201 return ERROR_INVALID_ARGUMENTS
;
1204 if (arm_algorithm_info
->core_mode
!= ARM_MODE_ANY
)
1206 LOG_DEBUG("setting core_mode: 0x%2.2x",
1207 arm_algorithm_info
->core_mode
);
1208 buf_set_u32(armv4_5
->cpsr
->value
, 0, 5,
1209 arm_algorithm_info
->core_mode
);
1210 armv4_5
->cpsr
->dirty
= 1;
1211 armv4_5
->cpsr
->valid
= 1;
1214 /* terminate using a hardware or (ARMv5+) software breakpoint */
1215 if (exit_point
&& (retval
= breakpoint_add(target
, exit_point
,
1216 exit_breakpoint_size
, BKPT_HARD
)) != ERROR_OK
)
1218 LOG_ERROR("can't add HW breakpoint to terminate algorithm");
1219 return ERROR_TARGET_FAILURE
;
1222 if ((retval
= target_resume(target
, 0, entry_point
, 1, 1)) != ERROR_OK
)
1227 retval
= run_it(target
, exit_point
, timeout_ms
, arch_info
);
1230 breakpoint_remove(target
, exit_point
);
1232 if (retval
!= ERROR_OK
)
1235 for (i
= 0; i
< num_mem_params
; i
++)
1237 if (mem_params
[i
].direction
!= PARAM_OUT
)
1238 if ((retvaltemp
= target_read_buffer(target
, mem_params
[i
].address
, mem_params
[i
].size
, mem_params
[i
].value
)) != ERROR_OK
)
1240 retval
= retvaltemp
;
1244 for (i
= 0; i
< num_reg_params
; i
++)
1246 if (reg_params
[i
].direction
!= PARAM_OUT
)
1249 struct reg
*reg
= register_get_by_name(armv4_5
->core_cache
, reg_params
[i
].reg_name
, 0);
1252 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
1253 retval
= ERROR_INVALID_ARGUMENTS
;
1257 if (reg
->size
!= reg_params
[i
].size
)
1259 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size", reg_params
[i
].reg_name
);
1260 retval
= ERROR_INVALID_ARGUMENTS
;
1264 buf_set_u32(reg_params
[i
].value
, 0, 32, buf_get_u32(reg
->value
, 0, 32));
1268 /* restore everything we saved before (17 or 18 registers) */
1269 for (i
= 0; i
<= 16; i
++)
1272 regvalue
= buf_get_u32(ARMV4_5_CORE_REG_MODE(armv4_5
->core_cache
, arm_algorithm_info
->core_mode
, i
).value
, 0, 32);
1273 if (regvalue
!= context
[i
])
1275 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32
"", ARMV4_5_CORE_REG_MODE(armv4_5
->core_cache
, arm_algorithm_info
->core_mode
, i
).name
, context
[i
]);
1276 buf_set_u32(ARMV4_5_CORE_REG_MODE(armv4_5
->core_cache
, arm_algorithm_info
->core_mode
, i
).value
, 0, 32, context
[i
]);
1277 ARMV4_5_CORE_REG_MODE(armv4_5
->core_cache
, arm_algorithm_info
->core_mode
, i
).valid
= 1;
1278 ARMV4_5_CORE_REG_MODE(armv4_5
->core_cache
, arm_algorithm_info
->core_mode
, i
).dirty
= 1;
1282 arm_set_cpsr(armv4_5
, cpsr
);
1283 armv4_5
->cpsr
->dirty
= 1;
1285 armv4_5
->core_state
= core_state
;
1290 int armv4_5_run_algorithm(struct target
*target
, int num_mem_params
, struct mem_param
*mem_params
, int num_reg_params
, struct reg_param
*reg_params
, uint32_t entry_point
, uint32_t exit_point
, int timeout_ms
, void *arch_info
)
1292 return armv4_5_run_algorithm_inner(target
, num_mem_params
, mem_params
, num_reg_params
, reg_params
, entry_point
, exit_point
, timeout_ms
, arch_info
, armv4_5_run_algorithm_completion
);
1296 * Runs ARM code in the target to calculate a CRC32 checksum.
1298 * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
1300 int arm_checksum_memory(struct target
*target
,
1301 uint32_t address
, uint32_t count
, uint32_t *checksum
)
1303 struct working_area
*crc_algorithm
;
1304 struct arm_algorithm armv4_5_info
;
1305 struct reg_param reg_params
[2];
1309 static const uint32_t arm_crc_code
[] = {
1310 0xE1A02000, /* mov r2, r0 */
1311 0xE3E00000, /* mov r0, #0xffffffff */
1312 0xE1A03001, /* mov r3, r1 */
1313 0xE3A04000, /* mov r4, #0 */
1314 0xEA00000B, /* b ncomp */
1316 0xE7D21004, /* ldrb r1, [r2, r4] */
1317 0xE59F7030, /* ldr r7, CRC32XOR */
1318 0xE0200C01, /* eor r0, r0, r1, asl 24 */
1319 0xE3A05000, /* mov r5, #0 */
1321 0xE3500000, /* cmp r0, #0 */
1322 0xE1A06080, /* mov r6, r0, asl #1 */
1323 0xE2855001, /* add r5, r5, #1 */
1324 0xE1A00006, /* mov r0, r6 */
1325 0xB0260007, /* eorlt r0, r6, r7 */
1326 0xE3550008, /* cmp r5, #8 */
1327 0x1AFFFFF8, /* bne loop */
1328 0xE2844001, /* add r4, r4, #1 */
1330 0xE1540003, /* cmp r4, r3 */
1331 0x1AFFFFF1, /* bne nbyte */
1333 0xEAFFFFFE, /* b end */
1335 0x04C11DB7 /* .word 0x04C11DB7 */
1338 retval
= target_alloc_working_area(target
,
1339 sizeof(arm_crc_code
), &crc_algorithm
);
1340 if (retval
!= ERROR_OK
)
1343 /* convert code into a buffer in target endianness */
1344 for (i
= 0; i
< ARRAY_SIZE(arm_crc_code
); i
++) {
1345 retval
= target_write_u32(target
,
1346 crc_algorithm
->address
+ i
* sizeof(uint32_t),
1348 if (retval
!= ERROR_OK
)
1352 armv4_5_info
.common_magic
= ARM_COMMON_MAGIC
;
1353 armv4_5_info
.core_mode
= ARM_MODE_SVC
;
1354 armv4_5_info
.core_state
= ARM_STATE_ARM
;
1356 init_reg_param(®_params
[0], "r0", 32, PARAM_IN_OUT
);
1357 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
1359 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
1360 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
1362 /* 20 second timeout/megabyte */
1363 int timeout
= 20000 * (1 + (count
/ (1024 * 1024)));
1365 retval
= target_run_algorithm(target
, 0, NULL
, 2, reg_params
,
1366 crc_algorithm
->address
,
1367 crc_algorithm
->address
+ sizeof(arm_crc_code
) - 8,
1368 timeout
, &armv4_5_info
);
1369 if (retval
!= ERROR_OK
) {
1370 LOG_ERROR("error executing ARM crc algorithm");
1371 destroy_reg_param(®_params
[0]);
1372 destroy_reg_param(®_params
[1]);
1373 target_free_working_area(target
, crc_algorithm
);
1377 *checksum
= buf_get_u32(reg_params
[0].value
, 0, 32);
1379 destroy_reg_param(®_params
[0]);
1380 destroy_reg_param(®_params
[1]);
1382 target_free_working_area(target
, crc_algorithm
);
1388 * Runs ARM code in the target to check whether a memory block holds
1389 * all ones. NOR flash which has been erased, and thus may be written,
1392 * \todo On ARMv5+, rely on BKPT termination for reduced overhead.
1394 int arm_blank_check_memory(struct target
*target
,
1395 uint32_t address
, uint32_t count
, uint32_t *blank
)
1397 struct working_area
*check_algorithm
;
1398 struct reg_param reg_params
[3];
1399 struct arm_algorithm armv4_5_info
;
1403 static const uint32_t check_code
[] = {
1405 0xe4d03001, /* ldrb r3, [r0], #1 */
1406 0xe0022003, /* and r2, r2, r3 */
1407 0xe2511001, /* subs r1, r1, #1 */
1408 0x1afffffb, /* bne loop */
1410 0xeafffffe /* b end */
1413 /* make sure we have a working area */
1414 retval
= target_alloc_working_area(target
,
1415 sizeof(check_code
), &check_algorithm
);
1416 if (retval
!= ERROR_OK
)
1419 /* convert code into a buffer in target endianness */
1420 for (i
= 0; i
< ARRAY_SIZE(check_code
); i
++) {
1421 retval
= target_write_u32(target
,
1422 check_algorithm
->address
1423 + i
* sizeof(uint32_t),
1425 if (retval
!= ERROR_OK
)
1429 armv4_5_info
.common_magic
= ARM_COMMON_MAGIC
;
1430 armv4_5_info
.core_mode
= ARM_MODE_SVC
;
1431 armv4_5_info
.core_state
= ARM_STATE_ARM
;
1433 init_reg_param(®_params
[0], "r0", 32, PARAM_OUT
);
1434 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
1436 init_reg_param(®_params
[1], "r1", 32, PARAM_OUT
);
1437 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
1439 init_reg_param(®_params
[2], "r2", 32, PARAM_IN_OUT
);
1440 buf_set_u32(reg_params
[2].value
, 0, 32, 0xff);
1442 retval
= target_run_algorithm(target
, 0, NULL
, 3, reg_params
,
1443 check_algorithm
->address
,
1444 check_algorithm
->address
+ sizeof(check_code
) - 4,
1445 10000, &armv4_5_info
);
1446 if (retval
!= ERROR_OK
) {
1447 destroy_reg_param(®_params
[0]);
1448 destroy_reg_param(®_params
[1]);
1449 destroy_reg_param(®_params
[2]);
1450 target_free_working_area(target
, check_algorithm
);
1454 *blank
= buf_get_u32(reg_params
[2].value
, 0, 32);
1456 destroy_reg_param(®_params
[0]);
1457 destroy_reg_param(®_params
[1]);
1458 destroy_reg_param(®_params
[2]);
1460 target_free_working_area(target
, check_algorithm
);
1465 static int arm_full_context(struct target
*target
)
1467 struct arm
*armv4_5
= target_to_arm(target
);
1468 unsigned num_regs
= armv4_5
->core_cache
->num_regs
;
1469 struct reg
*reg
= armv4_5
->core_cache
->reg_list
;
1470 int retval
= ERROR_OK
;
1472 for (; num_regs
&& retval
== ERROR_OK
; num_regs
--, reg
++) {
1475 retval
= armv4_5_get_core_reg(reg
);
1480 static int arm_default_mrc(struct target
*target
, int cpnum
,
1481 uint32_t op1
, uint32_t op2
,
1482 uint32_t CRn
, uint32_t CRm
,
1485 LOG_ERROR("%s doesn't implement MRC", target_type_name(target
));
1489 static int arm_default_mcr(struct target
*target
, int cpnum
,
1490 uint32_t op1
, uint32_t op2
,
1491 uint32_t CRn
, uint32_t CRm
,
1494 LOG_ERROR("%s doesn't implement MCR", target_type_name(target
));
1498 int arm_init_arch_info(struct target
*target
, struct arm
*armv4_5
)
1500 target
->arch_info
= armv4_5
;
1501 armv4_5
->target
= target
;
1503 armv4_5
->common_magic
= ARM_COMMON_MAGIC
;
1505 /* core_type may be overridden by subtype logic */
1506 if (armv4_5
->core_type
!= ARM_MODE_THREAD
) {
1507 armv4_5
->core_type
= ARM_MODE_ANY
;
1508 arm_set_cpsr(armv4_5
, ARM_MODE_USR
);
1511 /* default full_context() has no core-specific optimizations */
1512 if (!armv4_5
->full_context
&& armv4_5
->read_core_reg
)
1513 armv4_5
->full_context
= arm_full_context
;
1516 armv4_5
->mrc
= arm_default_mrc
;
1518 armv4_5
->mcr
= arm_default_mcr
;