1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
5 * Copyright (C) 2008 by David T.L. Wong *
7 * Copyright (C) 2007,2008 Øyvind Harboe *
8 * oyvind.harboe@zylin.com *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
15 * This program is distributed in the hope that it will be useful, *
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18 * GNU General Public License for more details. *
20 * You should have received a copy of the GNU General Public License *
21 * along with this program; if not, write to the *
22 * Free Software Foundation, Inc., *
23 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
24 ***************************************************************************/
30 #include "breakpoints.h"
31 #include "algorithm.h"
34 static char* mips32_core_reg_list
[] =
36 "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
37 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
38 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
39 "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra",
40 "status", "lo", "hi", "badvaddr", "cause", "pc"
43 static const char *mips_isa_strings
[] =
48 static struct mips32_core_reg mips32_core_reg_list_arch_info
[MIPS32NUMCOREREGS
] =
91 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
92 * we also add 18 unknown registers to handle gdb requests */
94 #define MIPS32NUMFPREGS 34 + 18
96 static uint8_t mips32_gdb_dummy_fp_value
[] = {0, 0, 0, 0};
98 static struct reg mips32_gdb_dummy_fp_reg
=
100 .name
= "GDB dummy floating-point register",
101 .value
= mips32_gdb_dummy_fp_value
,
108 static int mips32_get_core_reg(struct reg
*reg
)
111 struct mips32_core_reg
*mips32_reg
= reg
->arch_info
;
112 struct target
*target
= mips32_reg
->target
;
113 struct mips32_common
*mips32_target
= target_to_mips32(target
);
115 if (target
->state
!= TARGET_HALTED
)
117 return ERROR_TARGET_NOT_HALTED
;
120 retval
= mips32_target
->read_core_reg(target
, mips32_reg
->num
);
125 static int mips32_set_core_reg(struct reg
*reg
, uint8_t *buf
)
127 struct mips32_core_reg
*mips32_reg
= reg
->arch_info
;
128 struct target
*target
= mips32_reg
->target
;
129 uint32_t value
= buf_get_u32(buf
, 0, 32);
131 if (target
->state
!= TARGET_HALTED
)
133 return ERROR_TARGET_NOT_HALTED
;
136 buf_set_u32(reg
->value
, 0, 32, value
);
143 static int mips32_read_core_reg(struct target
*target
, int num
)
146 struct mips32_core_reg
*mips_core_reg
;
148 /* get pointers to arch-specific information */
149 struct mips32_common
*mips32
= target_to_mips32(target
);
151 if ((num
< 0) || (num
>= MIPS32NUMCOREREGS
))
152 return ERROR_INVALID_ARGUMENTS
;
154 mips_core_reg
= mips32
->core_cache
->reg_list
[num
].arch_info
;
155 reg_value
= mips32
->core_regs
[num
];
156 buf_set_u32(mips32
->core_cache
->reg_list
[num
].value
, 0, 32, reg_value
);
157 mips32
->core_cache
->reg_list
[num
].valid
= 1;
158 mips32
->core_cache
->reg_list
[num
].dirty
= 0;
163 static int mips32_write_core_reg(struct target
*target
, int num
)
166 struct mips32_core_reg
*mips_core_reg
;
168 /* get pointers to arch-specific information */
169 struct mips32_common
*mips32
= target_to_mips32(target
);
171 if ((num
< 0) || (num
>= MIPS32NUMCOREREGS
))
172 return ERROR_INVALID_ARGUMENTS
;
174 reg_value
= buf_get_u32(mips32
->core_cache
->reg_list
[num
].value
, 0, 32);
175 mips_core_reg
= mips32
->core_cache
->reg_list
[num
].arch_info
;
176 mips32
->core_regs
[num
] = reg_value
;
177 LOG_DEBUG("write core reg %i value 0x%" PRIx32
"", num
, reg_value
);
178 mips32
->core_cache
->reg_list
[num
].valid
= 1;
179 mips32
->core_cache
->reg_list
[num
].dirty
= 0;
184 int mips32_get_gdb_reg_list(struct target
*target
, struct reg
**reg_list
[], int *reg_list_size
)
186 /* get pointers to arch-specific information */
187 struct mips32_common
*mips32
= target_to_mips32(target
);
190 /* include floating point registers */
191 *reg_list_size
= MIPS32NUMCOREREGS
+ MIPS32NUMFPREGS
;
192 *reg_list
= malloc(sizeof(struct reg
*) * (*reg_list_size
));
194 for (i
= 0; i
< MIPS32NUMCOREREGS
; i
++)
196 (*reg_list
)[i
] = &mips32
->core_cache
->reg_list
[i
];
199 /* add dummy floating points regs */
200 for (i
= MIPS32NUMCOREREGS
; i
< (MIPS32NUMCOREREGS
+ MIPS32NUMFPREGS
); i
++)
202 (*reg_list
)[i
] = &mips32_gdb_dummy_fp_reg
;
208 int mips32_save_context(struct target
*target
)
212 /* get pointers to arch-specific information */
213 struct mips32_common
*mips32
= target_to_mips32(target
);
214 struct mips_ejtag
*ejtag_info
= &mips32
->ejtag_info
;
216 /* read core registers */
217 mips32_pracc_read_regs(ejtag_info
, mips32
->core_regs
);
219 for (i
= 0; i
< MIPS32NUMCOREREGS
; i
++)
221 if (!mips32
->core_cache
->reg_list
[i
].valid
)
223 mips32
->read_core_reg(target
, i
);
230 int mips32_restore_context(struct target
*target
)
234 /* get pointers to arch-specific information */
235 struct mips32_common
*mips32
= target_to_mips32(target
);
236 struct mips_ejtag
*ejtag_info
= &mips32
->ejtag_info
;
238 for (i
= 0; i
< MIPS32NUMCOREREGS
; i
++)
240 if (mips32
->core_cache
->reg_list
[i
].dirty
)
242 mips32
->write_core_reg(target
, i
);
246 /* write core regs */
247 mips32_pracc_write_regs(ejtag_info
, mips32
->core_regs
);
252 int mips32_arch_state(struct target
*target
)
254 struct mips32_common
*mips32
= target_to_mips32(target
);
256 LOG_USER("target halted in %s mode due to %s, pc: 0x%8.8" PRIx32
"",
257 mips_isa_strings
[mips32
->isa_mode
],
258 debug_reason_name(target
),
259 buf_get_u32(mips32
->core_cache
->reg_list
[MIPS32_PC
].value
, 0, 32));
264 static const struct reg_arch_type mips32_reg_type
= {
265 .get
= mips32_get_core_reg
,
266 .set
= mips32_set_core_reg
,
269 struct reg_cache
*mips32_build_reg_cache(struct target
*target
)
271 /* get pointers to arch-specific information */
272 struct mips32_common
*mips32
= target_to_mips32(target
);
274 int num_regs
= MIPS32NUMCOREREGS
;
275 struct reg_cache
**cache_p
= register_get_last_cache_p(&target
->reg_cache
);
276 struct reg_cache
*cache
= malloc(sizeof(struct reg_cache
));
277 struct reg
*reg_list
= malloc(sizeof(struct reg
) * num_regs
);
278 struct mips32_core_reg
*arch_info
= malloc(sizeof(struct mips32_core_reg
) * num_regs
);
281 register_init_dummy(&mips32_gdb_dummy_fp_reg
);
283 /* Build the process context cache */
284 cache
->name
= "mips32 registers";
286 cache
->reg_list
= reg_list
;
287 cache
->num_regs
= num_regs
;
289 mips32
->core_cache
= cache
;
291 for (i
= 0; i
< num_regs
; i
++)
293 arch_info
[i
] = mips32_core_reg_list_arch_info
[i
];
294 arch_info
[i
].target
= target
;
295 arch_info
[i
].mips32_common
= mips32
;
296 reg_list
[i
].name
= mips32_core_reg_list
[i
];
297 reg_list
[i
].size
= 32;
298 reg_list
[i
].value
= calloc(1, 4);
299 reg_list
[i
].dirty
= 0;
300 reg_list
[i
].valid
= 0;
301 reg_list
[i
].type
= &mips32_reg_type
;
302 reg_list
[i
].arch_info
= &arch_info
[i
];
308 int mips32_init_arch_info(struct target
*target
, struct mips32_common
*mips32
, struct jtag_tap
*tap
)
310 target
->arch_info
= mips32
;
311 mips32
->common_magic
= MIPS32_COMMON_MAGIC
;
313 /* has breakpoint/watchpint unit been scanned */
314 mips32
->bp_scanned
= 0;
315 mips32
->data_break_list
= NULL
;
317 mips32
->ejtag_info
.tap
= tap
;
318 mips32
->read_core_reg
= mips32_read_core_reg
;
319 mips32
->write_core_reg
= mips32_write_core_reg
;
324 /* run to exit point. return error if exit point was not reached. */
325 static int mips32_run_and_wait(struct target
*target
, uint32_t entry_point
,
326 int timeout_ms
, uint32_t exit_point
, struct mips32_common
*mips32
)
330 /* This code relies on the target specific resume() and poll()->debug_entry()
331 * sequence to write register values to the processor and the read them back */
332 if ((retval
= target_resume(target
, 0, entry_point
, 0, 1)) != ERROR_OK
)
337 retval
= target_wait_state(target
, TARGET_HALTED
, timeout_ms
);
338 /* If the target fails to halt due to the breakpoint, force a halt */
339 if (retval
!= ERROR_OK
|| target
->state
!= TARGET_HALTED
)
341 if ((retval
= target_halt(target
)) != ERROR_OK
)
343 if ((retval
= target_wait_state(target
, TARGET_HALTED
, 500)) != ERROR_OK
)
347 return ERROR_TARGET_TIMEOUT
;
350 pc
= buf_get_u32(mips32
->core_cache
->reg_list
[MIPS32_PC
].value
, 0, 32);
351 if (pc
!= exit_point
)
353 LOG_DEBUG("failed algoritm halted at 0x%" PRIx32
" ", pc
);
354 return ERROR_TARGET_TIMEOUT
;
360 int mips32_run_algorithm(struct target
*target
, int num_mem_params
,
361 struct mem_param
*mem_params
, int num_reg_params
,
362 struct reg_param
*reg_params
, uint32_t entry_point
,
363 uint32_t exit_point
, int timeout_ms
, void *arch_info
)
365 struct mips32_common
*mips32
= target_to_mips32(target
);
366 struct mips32_algorithm
*mips32_algorithm_info
= arch_info
;
367 enum mips32_isa_mode isa_mode
= mips32
->isa_mode
;
369 uint32_t context
[MIPS32NUMCOREREGS
];
371 int retval
= ERROR_OK
;
373 LOG_DEBUG("Running algorithm");
375 /* NOTE: mips32_run_algorithm requires that each algorithm uses a software breakpoint
376 * at the exit point */
378 if (mips32
->common_magic
!= MIPS32_COMMON_MAGIC
)
380 LOG_ERROR("current target isn't a MIPS32 target");
381 return ERROR_TARGET_INVALID
;
384 if (target
->state
!= TARGET_HALTED
)
386 LOG_WARNING("target not halted");
387 return ERROR_TARGET_NOT_HALTED
;
390 /* refresh core register cache */
391 for (i
= 0; i
< MIPS32NUMCOREREGS
; i
++)
393 if (!mips32
->core_cache
->reg_list
[i
].valid
)
394 mips32
->read_core_reg(target
, i
);
395 context
[i
] = buf_get_u32(mips32
->core_cache
->reg_list
[i
].value
, 0, 32);
398 for (i
= 0; i
< num_mem_params
; i
++)
400 if ((retval
= target_write_buffer(target
, mem_params
[i
].address
,
401 mem_params
[i
].size
, mem_params
[i
].value
)) != ERROR_OK
)
407 for (i
= 0; i
< num_reg_params
; i
++)
409 struct reg
*reg
= register_get_by_name(mips32
->core_cache
, reg_params
[i
].reg_name
, 0);
413 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
414 return ERROR_INVALID_ARGUMENTS
;
417 if (reg
->size
!= reg_params
[i
].size
)
419 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
420 reg_params
[i
].reg_name
);
421 return ERROR_INVALID_ARGUMENTS
;
424 mips32_set_core_reg(reg
, reg_params
[i
].value
);
427 mips32
->isa_mode
= mips32_algorithm_info
->isa_mode
;
429 retval
= mips32_run_and_wait(target
, entry_point
, timeout_ms
, exit_point
, mips32
);
431 if (retval
!= ERROR_OK
)
434 for (i
= 0; i
< num_mem_params
; i
++)
436 if (mem_params
[i
].direction
!= PARAM_OUT
)
438 if ((retval
= target_read_buffer(target
, mem_params
[i
].address
, mem_params
[i
].size
,
439 mem_params
[i
].value
)) != ERROR_OK
)
446 for (i
= 0; i
< num_reg_params
; i
++)
448 if (reg_params
[i
].direction
!= PARAM_OUT
)
450 struct reg
*reg
= register_get_by_name(mips32
->core_cache
, reg_params
[i
].reg_name
, 0);
453 LOG_ERROR("BUG: register '%s' not found", reg_params
[i
].reg_name
);
454 return ERROR_INVALID_ARGUMENTS
;
457 if (reg
->size
!= reg_params
[i
].size
)
459 LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
460 reg_params
[i
].reg_name
);
461 return ERROR_INVALID_ARGUMENTS
;
464 buf_set_u32(reg_params
[i
].value
, 0, 32, buf_get_u32(reg
->value
, 0, 32));
468 /* restore everything we saved before */
469 for (i
= 0; i
< MIPS32NUMCOREREGS
; i
++)
472 regvalue
= buf_get_u32(mips32
->core_cache
->reg_list
[i
].value
, 0, 32);
473 if (regvalue
!= context
[i
])
475 LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32
,
476 mips32
->core_cache
->reg_list
[i
].name
, context
[i
]);
477 buf_set_u32(mips32
->core_cache
->reg_list
[i
].value
,
479 mips32
->core_cache
->reg_list
[i
].valid
= 1;
480 mips32
->core_cache
->reg_list
[i
].dirty
= 1;
484 mips32
->isa_mode
= isa_mode
;
489 int mips32_examine(struct target
*target
)
491 struct mips32_common
*mips32
= target_to_mips32(target
);
493 if (!target_was_examined(target
))
495 target_set_examined(target
);
497 /* we will configure later */
498 mips32
->bp_scanned
= 0;
499 mips32
->num_inst_bpoints
= 0;
500 mips32
->num_data_bpoints
= 0;
501 mips32
->num_inst_bpoints_avail
= 0;
502 mips32
->num_data_bpoints_avail
= 0;
508 int mips32_configure_break_unit(struct target
*target
)
510 /* get pointers to arch-specific information */
511 struct mips32_common
*mips32
= target_to_mips32(target
);
513 uint32_t dcr
, bpinfo
;
516 if (mips32
->bp_scanned
)
519 /* get info about breakpoint support */
520 if ((retval
= target_read_u32(target
, EJTAG_DCR
, &dcr
)) != ERROR_OK
)
523 if (dcr
& EJTAG_DCR_IB
)
525 /* get number of inst breakpoints */
526 if ((retval
= target_read_u32(target
, EJTAG_IBS
, &bpinfo
)) != ERROR_OK
)
529 mips32
->num_inst_bpoints
= (bpinfo
>> 24) & 0x0F;
530 mips32
->num_inst_bpoints_avail
= mips32
->num_inst_bpoints
;
531 mips32
->inst_break_list
= calloc(mips32
->num_inst_bpoints
, sizeof(struct mips32_comparator
));
532 for (i
= 0; i
< mips32
->num_inst_bpoints
; i
++)
534 mips32
->inst_break_list
[i
].reg_address
= EJTAG_IBA1
+ (0x100 * i
);
538 if ((retval
= target_write_u32(target
, EJTAG_IBS
, 0)) != ERROR_OK
)
542 if (dcr
& EJTAG_DCR_DB
)
544 /* get number of data breakpoints */
545 if ((retval
= target_read_u32(target
, EJTAG_DBS
, &bpinfo
)) != ERROR_OK
)
548 mips32
->num_data_bpoints
= (bpinfo
>> 24) & 0x0F;
549 mips32
->num_data_bpoints_avail
= mips32
->num_data_bpoints
;
550 mips32
->data_break_list
= calloc(mips32
->num_data_bpoints
, sizeof(struct mips32_comparator
));
551 for (i
= 0; i
< mips32
->num_data_bpoints
; i
++)
553 mips32
->data_break_list
[i
].reg_address
= EJTAG_DBA1
+ (0x100 * i
);
557 if ((retval
= target_write_u32(target
, EJTAG_DBS
, 0)) != ERROR_OK
)
561 LOG_DEBUG("DCR 0x%" PRIx32
" numinst %i numdata %i", dcr
, mips32
->num_inst_bpoints
,
562 mips32
->num_data_bpoints
);
564 mips32
->bp_scanned
= 1;
569 int mips32_enable_interrupts(struct target
*target
, int enable
)
575 /* read debug control register */
576 if ((retval
= target_read_u32(target
, EJTAG_DCR
, &dcr
)) != ERROR_OK
)
581 if (!(dcr
& EJTAG_DCR_INTE
))
583 /* enable interrupts */
584 dcr
|= EJTAG_DCR_INTE
;
590 if (dcr
& EJTAG_DCR_INTE
)
592 /* disable interrupts */
593 dcr
&= ~EJTAG_DCR_INTE
;
600 if ((retval
= target_write_u32(target
, EJTAG_DCR
, dcr
)) != ERROR_OK
)
607 int mips32_checksum_memory(struct target
*target
, uint32_t address
,
608 uint32_t count
, uint32_t* checksum
)
610 struct working_area
*crc_algorithm
;
611 struct reg_param reg_params
[2];
612 struct mips32_algorithm mips32_info
;
616 static const uint32_t mips_crc_code
[] =
618 0x248C0000, /* addiu $t4, $a0, 0 */
619 0x24AA0000, /* addiu $t2, $a1, 0 */
620 0x2404FFFF, /* addiu $a0, $zero, 0xffffffff */
621 0x10000010, /* beq $zero, $zero, ncomp */
622 0x240B0000, /* addiu $t3, $zero, 0 */
624 0x81850000, /* lb $a1, ($t4) */
625 0x218C0001, /* addi $t4, $t4, 1 */
626 0x00052E00, /* sll $a1, $a1, 24 */
627 0x3C0204C1, /* lui $v0, 0x04c1 */
628 0x00852026, /* xor $a0, $a0, $a1 */
629 0x34471DB7, /* ori $a3, $v0, 0x1db7 */
630 0x00003021, /* addu $a2, $zero, $zero */
632 0x00044040, /* sll $t0, $a0, 1 */
633 0x24C60001, /* addiu $a2, $a2, 1 */
634 0x28840000, /* slti $a0, $a0, 0 */
635 0x01074826, /* xor $t1, $t0, $a3 */
636 0x0124400B, /* movn $t0, $t1, $a0 */
637 0x28C30008, /* slti $v1, $a2, 8 */
638 0x1460FFF9, /* bne $v1, $zero, loop */
639 0x01002021, /* addu $a0, $t0, $zero */
641 0x154BFFF0, /* bne $t2, $t3, nbyte */
642 0x256B0001, /* addiu $t3, $t3, 1 */
643 0x7000003F, /* sdbbp */
646 /* make sure we have a working area */
647 if (target_alloc_working_area(target
, sizeof(mips_crc_code
), &crc_algorithm
) != ERROR_OK
)
649 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
652 /* convert flash writing code into a buffer in target endianness */
653 for (i
= 0; i
< ARRAY_SIZE(mips_crc_code
); i
++)
654 target_write_u32(target
, crc_algorithm
->address
+ i
*sizeof(uint32_t), mips_crc_code
[i
]);
656 mips32_info
.common_magic
= MIPS32_COMMON_MAGIC
;
657 mips32_info
.isa_mode
= MIPS32_ISA_MIPS32
;
659 init_reg_param(®_params
[0], "a0", 32, PARAM_IN_OUT
);
660 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
662 init_reg_param(®_params
[1], "a1", 32, PARAM_OUT
);
663 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
665 int timeout
= 20000 * (1 + (count
/ (1024 * 1024)));
667 if ((retval
= target_run_algorithm(target
, 0, NULL
, 2, reg_params
,
668 crc_algorithm
->address
, crc_algorithm
->address
+ (sizeof(mips_crc_code
)-4), timeout
,
669 &mips32_info
)) != ERROR_OK
)
671 destroy_reg_param(®_params
[0]);
672 destroy_reg_param(®_params
[1]);
673 target_free_working_area(target
, crc_algorithm
);
677 *checksum
= buf_get_u32(reg_params
[0].value
, 0, 32);
679 destroy_reg_param(®_params
[0]);
680 destroy_reg_param(®_params
[1]);
682 target_free_working_area(target
, crc_algorithm
);
687 /** Checks whether a memory region is zeroed. */
688 int mips32_blank_check_memory(struct target
*target
,
689 uint32_t address
, uint32_t count
, uint32_t* blank
)
691 struct working_area
*erase_check_algorithm
;
692 struct reg_param reg_params
[3];
693 struct mips32_algorithm mips32_info
;
697 static const uint32_t erase_check_code
[] =
700 0x80880000, /* lb $t0, ($a0) */
701 0x00C83024, /* and $a2, $a2, $t0 */
702 0x24A5FFFF, /* addiu $a1, $a1, -1 */
703 0x14A0FFFC, /* bne $a1, $zero, nbyte */
704 0x24840001, /* addiu $a0, $a0, 1 */
705 0x7000003F /* sdbbp */
708 /* make sure we have a working area */
709 if (target_alloc_working_area(target
, sizeof(erase_check_code
), &erase_check_algorithm
) != ERROR_OK
)
711 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE
;
714 /* convert flash writing code into a buffer in target endianness */
715 for (i
= 0; i
< ARRAY_SIZE(erase_check_code
); i
++)
717 target_write_u32(target
, erase_check_algorithm
->address
+ i
*sizeof(uint32_t),
718 erase_check_code
[i
]);
721 mips32_info
.common_magic
= MIPS32_COMMON_MAGIC
;
722 mips32_info
.isa_mode
= MIPS32_ISA_MIPS32
;
724 init_reg_param(®_params
[0], "a0", 32, PARAM_OUT
);
725 buf_set_u32(reg_params
[0].value
, 0, 32, address
);
727 init_reg_param(®_params
[1], "a1", 32, PARAM_OUT
);
728 buf_set_u32(reg_params
[1].value
, 0, 32, count
);
730 init_reg_param(®_params
[2], "a2", 32, PARAM_IN_OUT
);
731 buf_set_u32(reg_params
[2].value
, 0, 32, 0xff);
733 if ((retval
= target_run_algorithm(target
, 0, NULL
, 3, reg_params
,
734 erase_check_algorithm
->address
,
735 erase_check_algorithm
->address
+ (sizeof(erase_check_code
)-2),
736 10000, &mips32_info
)) != ERROR_OK
)
738 destroy_reg_param(®_params
[0]);
739 destroy_reg_param(®_params
[1]);
740 destroy_reg_param(®_params
[2]);
741 target_free_working_area(target
, erase_check_algorithm
);
745 *blank
= buf_get_u32(reg_params
[2].value
, 0, 32);
747 destroy_reg_param(®_params
[0]);
748 destroy_reg_param(®_params
[1]);
749 destroy_reg_param(®_params
[2]);
751 target_free_working_area(target
, erase_check_algorithm
);
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