1 /* Target-dependent code for Atmel AVR, for GDB.
3 Copyright (C) 1996-2021 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 /* Contributed by Theodore A. Roth, troth@openavr.org */
22 /* Portions of this file were taken from the original gdb-4.18 patch developed
23 by Denis Chertykov, denisc@overta.ru */
27 #include "frame-unwind.h"
28 #include "frame-base.h"
29 #include "trad-frame.h"
35 #include "arch-utils.h"
43 (AVR micros are pure Harvard Architecture processors.)
45 The AVR family of microcontrollers have three distinctly different memory
46 spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for
47 the most part to store program instructions. The sram is 8 bits wide and is
48 used for the stack and the heap. Some devices lack sram and some can have
49 an additional external sram added on as a peripheral.
51 The eeprom is 8 bits wide and is used to store data when the device is
52 powered down. Eeprom is not directly accessible, it can only be accessed
53 via io-registers using a special algorithm. Accessing eeprom via gdb's
54 remote serial protocol ('m' or 'M' packets) looks difficult to do and is
55 not included at this time.
57 [The eeprom could be read manually via ``x/b <eaddr + AVR_EMEM_START>'' or
58 written using ``set {unsigned char}<eaddr + AVR_EMEM_START>''. For this to
59 work, the remote target must be able to handle eeprom accesses and perform
60 the address translation.]
62 All three memory spaces have physical addresses beginning at 0x0. In
63 addition, the flash is addressed by gcc/binutils/gdb with respect to 8 bit
64 bytes instead of the 16 bit wide words used by the real device for the
67 In order for remote targets to work correctly, extra bits must be added to
68 addresses before they are send to the target or received from the target
69 via the remote serial protocol. The extra bits are the MSBs and are used to
70 decode which memory space the address is referring to. */
72 /* Constants: prefixed with AVR_ to avoid name space clashes */
74 /* Address space flags */
76 /* We are assigning the TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1 to the flash address
79 #define AVR_TYPE_ADDRESS_CLASS_FLASH TYPE_ADDRESS_CLASS_1
80 #define AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH \
81 TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1
96 AVR_NUM_REGS
= 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/,
97 AVR_NUM_REG_BYTES
= 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/,
99 /* Pseudo registers. */
100 AVR_PSEUDO_PC_REGNUM
= 35,
101 AVR_NUM_PSEUDO_REGS
= 1,
103 AVR_PC_REG_INDEX
= 35, /* index into array of registers */
105 AVR_MAX_PROLOGUE_SIZE
= 64, /* bytes */
107 /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */
110 /* Number of the last pushed register. r17 for current avr-gcc */
111 AVR_LAST_PUSHED_REGNUM
= 17,
113 AVR_ARG1_REGNUM
= 24, /* Single byte argument */
114 AVR_ARGN_REGNUM
= 25, /* Multi byte argments */
115 AVR_LAST_ARG_REGNUM
= 8, /* Last argument register */
117 AVR_RET1_REGNUM
= 24, /* Single byte return value */
118 AVR_RETN_REGNUM
= 25, /* Multi byte return value */
120 /* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8
121 bits? Do these have to match the bfd vma values? It sure would make
122 things easier in the future if they didn't need to match.
124 Note: I chose these values so as to be consistent with bfd vma
127 TRoth/2002-04-08: There is already a conflict with very large programs
128 in the mega128. The mega128 has 128K instruction bytes (64K words),
129 thus the Most Significant Bit is 0x10000 which gets masked off my
132 The problem manifests itself when trying to set a breakpoint in a
133 function which resides in the upper half of the instruction space and
134 thus requires a 17-bit address.
136 For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK
137 from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
138 but could be for some remote targets by just adding the correct offset
139 to the address and letting the remote target handle the low-level
140 details of actually accessing the eeprom. */
142 AVR_IMEM_START
= 0x00000000, /* INSN memory */
143 AVR_SMEM_START
= 0x00800000, /* SRAM memory */
145 /* No eeprom mask defined */
146 AVR_MEM_MASK
= 0x00f00000, /* mask to determine memory space */
148 AVR_EMEM_START
= 0x00810000, /* EEPROM memory */
149 AVR_MEM_MASK
= 0x00ff0000, /* mask to determine memory space */
155 NORMAL and CALL are the typical types (the -mcall-prologues gcc option
156 causes the generation of the CALL type prologues). */
159 AVR_PROLOGUE_NONE
, /* No prologue */
161 AVR_PROLOGUE_CALL
, /* -mcall-prologues */
163 AVR_PROLOGUE_INTR
, /* interrupt handler */
164 AVR_PROLOGUE_SIG
, /* signal handler */
167 /* Any function with a frame looks like this
168 ....... <-SP POINTS HERE
169 LOCALS1 <-FP POINTS HERE
178 struct avr_unwind_cache
180 /* The previous frame's inner most stack address. Used as this
181 frame ID's stack_addr. */
183 /* The frame's base, optionally used by the high-level debug info. */
187 /* Table indicating the location of each and every register. */
188 trad_frame_saved_reg
*saved_regs
;
191 struct avr_gdbarch_tdep
: gdbarch_tdep
193 /* Number of bytes stored to the stack by call instructions.
194 2 bytes for avr1-5 and avrxmega1-5, 3 bytes for avr6 and avrxmega6-7. */
198 struct type
*void_type
= nullptr;
199 /* Type for a function returning void. */
200 struct type
*func_void_type
= nullptr;
201 /* Type for a pointer to a function. Used for the type of PC. */
202 struct type
*pc_type
= nullptr;
205 /* Lookup the name of a register given it's number. */
208 avr_register_name (struct gdbarch
*gdbarch
, int regnum
)
210 static const char * const register_names
[] = {
211 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
212 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
213 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
214 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
220 if (regnum
>= (sizeof (register_names
) / sizeof (*register_names
)))
222 return register_names
[regnum
];
225 /* Return the GDB type object for the "standard" data type
226 of data in register N. */
229 avr_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
231 if (reg_nr
== AVR_PC_REGNUM
)
232 return builtin_type (gdbarch
)->builtin_uint32
;
234 avr_gdbarch_tdep
*tdep
= (avr_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
235 if (reg_nr
== AVR_PSEUDO_PC_REGNUM
)
236 return tdep
->pc_type
;
238 if (reg_nr
== AVR_SP_REGNUM
)
239 return builtin_type (gdbarch
)->builtin_data_ptr
;
241 return builtin_type (gdbarch
)->builtin_uint8
;
244 /* Instruction address checks and convertions. */
247 avr_make_iaddr (CORE_ADDR x
)
249 return ((x
) | AVR_IMEM_START
);
252 /* FIXME: TRoth: Really need to use a larger mask for instructions. Some
253 devices are already up to 128KBytes of flash space.
255 TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
258 avr_convert_iaddr_to_raw (CORE_ADDR x
)
260 return ((x
) & 0xffffffff);
263 /* SRAM address checks and convertions. */
266 avr_make_saddr (CORE_ADDR x
)
268 /* Return 0 for NULL. */
272 return ((x
) | AVR_SMEM_START
);
276 avr_convert_saddr_to_raw (CORE_ADDR x
)
278 return ((x
) & 0xffffffff);
281 /* EEPROM address checks and convertions. I don't know if these will ever
282 actually be used, but I've added them just the same. TRoth */
284 /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
285 programs in the mega128. */
287 /* static CORE_ADDR */
288 /* avr_make_eaddr (CORE_ADDR x) */
290 /* return ((x) | AVR_EMEM_START); */
294 /* avr_eaddr_p (CORE_ADDR x) */
296 /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */
299 /* static CORE_ADDR */
300 /* avr_convert_eaddr_to_raw (CORE_ADDR x) */
302 /* return ((x) & 0xffffffff); */
305 /* Convert from address to pointer and vice-versa. */
308 avr_address_to_pointer (struct gdbarch
*gdbarch
,
309 struct type
*type
, gdb_byte
*buf
, CORE_ADDR addr
)
311 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
313 /* Is it a data address in flash? */
314 if (AVR_TYPE_ADDRESS_CLASS_FLASH (type
))
316 /* A data pointer in flash is byte addressed. */
317 store_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
,
318 avr_convert_iaddr_to_raw (addr
));
320 /* Is it a code address? */
321 else if (TYPE_TARGET_TYPE (type
)->code () == TYPE_CODE_FUNC
322 || TYPE_TARGET_TYPE (type
)->code () == TYPE_CODE_METHOD
)
324 /* A code pointer is word (16 bits) addressed. We shift the address down
325 by 1 bit to convert it to a pointer. */
326 store_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
,
327 avr_convert_iaddr_to_raw (addr
>> 1));
331 /* Strip off any upper segment bits. */
332 store_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
,
333 avr_convert_saddr_to_raw (addr
));
338 avr_pointer_to_address (struct gdbarch
*gdbarch
,
339 struct type
*type
, const gdb_byte
*buf
)
341 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
343 = extract_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
);
345 /* Is it a data address in flash? */
346 if (AVR_TYPE_ADDRESS_CLASS_FLASH (type
))
348 /* A data pointer in flash is already byte addressed. */
349 return avr_make_iaddr (addr
);
351 /* Is it a code address? */
352 else if (TYPE_TARGET_TYPE (type
)->code () == TYPE_CODE_FUNC
353 || TYPE_TARGET_TYPE (type
)->code () == TYPE_CODE_METHOD
354 || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type
)))
356 /* A code pointer is word (16 bits) addressed so we shift it up
357 by 1 bit to convert it to an address. */
358 return avr_make_iaddr (addr
<< 1);
361 return avr_make_saddr (addr
);
365 avr_integer_to_address (struct gdbarch
*gdbarch
,
366 struct type
*type
, const gdb_byte
*buf
)
368 ULONGEST addr
= unpack_long (type
, buf
);
370 if (TYPE_DATA_SPACE (type
))
371 return avr_make_saddr (addr
);
373 return avr_make_iaddr (addr
);
377 avr_read_pc (readable_regcache
*regcache
)
381 regcache
->cooked_read (AVR_PC_REGNUM
, &pc
);
382 return avr_make_iaddr (pc
);
386 avr_write_pc (struct regcache
*regcache
, CORE_ADDR val
)
388 regcache_cooked_write_unsigned (regcache
, AVR_PC_REGNUM
,
389 avr_convert_iaddr_to_raw (val
));
392 static enum register_status
393 avr_pseudo_register_read (struct gdbarch
*gdbarch
, readable_regcache
*regcache
,
394 int regnum
, gdb_byte
*buf
)
397 enum register_status status
;
401 case AVR_PSEUDO_PC_REGNUM
:
402 status
= regcache
->raw_read (AVR_PC_REGNUM
, &val
);
403 if (status
!= REG_VALID
)
406 store_unsigned_integer (buf
, 4, gdbarch_byte_order (gdbarch
), val
);
409 internal_error (__FILE__
, __LINE__
, _("invalid regnum"));
414 avr_pseudo_register_write (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
415 int regnum
, const gdb_byte
*buf
)
421 case AVR_PSEUDO_PC_REGNUM
:
422 val
= extract_unsigned_integer (buf
, 4, gdbarch_byte_order (gdbarch
));
424 regcache_raw_write_unsigned (regcache
, AVR_PC_REGNUM
, val
);
427 internal_error (__FILE__
, __LINE__
, _("invalid regnum"));
431 /* Function: avr_scan_prologue
433 This function decodes an AVR function prologue to determine:
434 1) the size of the stack frame
435 2) which registers are saved on it
436 3) the offsets of saved regs
437 This information is stored in the avr_unwind_cache structure.
439 Some devices lack the sbiw instruction, so on those replace this:
445 A typical AVR function prologue with a frame pointer might look like this:
446 push rXX ; saved regs
452 sbiw r28,<LOCALS_SIZE>
453 in __tmp_reg__,__SREG__
456 out __SREG__,__tmp_reg__
459 A typical AVR function prologue without a frame pointer might look like
461 push rXX ; saved regs
464 A main function prologue looks like this:
465 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
466 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
470 A signal handler prologue looks like this:
473 in __tmp_reg__, __SREG__
476 push rXX ; save registers r18:r27, r30:r31
478 push r28 ; save frame pointer
482 sbiw r28, <LOCALS_SIZE>
486 A interrupt handler prologue looks like this:
490 in __tmp_reg__, __SREG__
493 push rXX ; save registers r18:r27, r30:r31
495 push r28 ; save frame pointer
499 sbiw r28, <LOCALS_SIZE>
505 A `-mcall-prologues' prologue looks like this (Note that the megas use a
506 jmp instead of a rjmp, thus the prologue is one word larger since jmp is a
507 32 bit insn and rjmp is a 16 bit insn):
508 ldi r26,lo8(<LOCALS_SIZE>)
509 ldi r27,hi8(<LOCALS_SIZE>)
510 ldi r30,pm_lo8(.L_foo_body)
511 ldi r31,pm_hi8(.L_foo_body)
512 rjmp __prologue_saves__+RRR
515 /* Not really part of a prologue, but still need to scan for it, is when a
516 function prologue moves values passed via registers as arguments to new
517 registers. In this case, all local variables live in registers, so there
518 may be some register saves. This is what it looks like:
522 There could be multiple movw's. If the target doesn't have a movw insn, it
523 will use two mov insns. This could be done after any of the above prologue
527 avr_scan_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc_beg
, CORE_ADDR pc_end
,
528 struct avr_unwind_cache
*info
)
530 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
534 struct bound_minimal_symbol msymbol
;
535 unsigned char prologue
[AVR_MAX_PROLOGUE_SIZE
];
539 len
= pc_end
- pc_beg
;
540 if (len
> AVR_MAX_PROLOGUE_SIZE
)
541 len
= AVR_MAX_PROLOGUE_SIZE
;
543 /* FIXME: TRoth/2003-06-11: This could be made more efficient by only
544 reading in the bytes of the prologue. The problem is that the figuring
545 out where the end of the prologue is is a bit difficult. The old code
546 tried to do that, but failed quite often. */
547 read_memory (pc_beg
, prologue
, len
);
549 /* Scanning main()'s prologue
550 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
551 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
558 static const unsigned char img
[] = {
559 0xde, 0xbf, /* out __SP_H__,r29 */
560 0xcd, 0xbf /* out __SP_L__,r28 */
563 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
564 /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
565 if ((insn
& 0xf0f0) == 0xe0c0)
567 locals
= (insn
& 0xf) | ((insn
& 0x0f00) >> 4);
568 insn
= extract_unsigned_integer (&prologue
[vpc
+ 2], 2, byte_order
);
569 /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
570 if ((insn
& 0xf0f0) == 0xe0d0)
572 locals
|= ((insn
& 0xf) | ((insn
& 0x0f00) >> 4)) << 8;
573 if (vpc
+ 4 + sizeof (img
) < len
574 && memcmp (prologue
+ vpc
+ 4, img
, sizeof (img
)) == 0)
576 info
->prologue_type
= AVR_PROLOGUE_MAIN
;
584 /* Scanning `-mcall-prologues' prologue
585 Classic prologue is 10 bytes, mega prologue is a 12 bytes long */
587 while (1) /* Using a while to avoid many goto's */
594 /* At least the fifth instruction must have been executed to
595 modify frame shape. */
599 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
600 /* ldi r26,<LOCALS_SIZE> */
601 if ((insn
& 0xf0f0) != 0xe0a0)
603 loc_size
= (insn
& 0xf) | ((insn
& 0x0f00) >> 4);
606 insn
= extract_unsigned_integer (&prologue
[vpc
+ 2], 2, byte_order
);
607 /* ldi r27,<LOCALS_SIZE> / 256 */
608 if ((insn
& 0xf0f0) != 0xe0b0)
610 loc_size
|= ((insn
& 0xf) | ((insn
& 0x0f00) >> 4)) << 8;
613 insn
= extract_unsigned_integer (&prologue
[vpc
+ 4], 2, byte_order
);
614 /* ldi r30,pm_lo8(.L_foo_body) */
615 if ((insn
& 0xf0f0) != 0xe0e0)
617 body_addr
= (insn
& 0xf) | ((insn
& 0x0f00) >> 4);
620 insn
= extract_unsigned_integer (&prologue
[vpc
+ 6], 2, byte_order
);
621 /* ldi r31,pm_hi8(.L_foo_body) */
622 if ((insn
& 0xf0f0) != 0xe0f0)
624 body_addr
|= ((insn
& 0xf) | ((insn
& 0x0f00) >> 4)) << 8;
627 msymbol
= lookup_minimal_symbol ("__prologue_saves__", NULL
, NULL
);
631 insn
= extract_unsigned_integer (&prologue
[vpc
+ 8], 2, byte_order
);
632 /* rjmp __prologue_saves__+RRR */
633 if ((insn
& 0xf000) == 0xc000)
635 /* Extract PC relative offset from RJMP */
636 i
= (insn
& 0xfff) | (insn
& 0x800 ? (-1 ^ 0xfff) : 0);
637 /* Convert offset to byte addressable mode */
639 /* Destination address */
642 if (body_addr
!= (pc_beg
+ 10)/2)
647 else if ((insn
& 0xfe0e) == 0x940c)
649 /* Extract absolute PC address from JMP */
650 i
= (((insn
& 0x1) | ((insn
& 0x1f0) >> 3) << 16)
651 | (extract_unsigned_integer (&prologue
[vpc
+ 10], 2, byte_order
)
653 /* Convert address to byte addressable mode */
656 if (body_addr
!= (pc_beg
+ 12)/2)
664 /* Resolve offset (in words) from __prologue_saves__ symbol.
665 Which is a pushes count in `-mcall-prologues' mode */
666 num_pushes
= AVR_MAX_PUSHES
- (i
- BMSYMBOL_VALUE_ADDRESS (msymbol
)) / 2;
668 if (num_pushes
> AVR_MAX_PUSHES
)
670 fprintf_unfiltered (gdb_stderr
, _("Num pushes too large: %d\n"),
679 info
->saved_regs
[AVR_FP_REGNUM
+ 1].set_addr (num_pushes
);
681 info
->saved_regs
[AVR_FP_REGNUM
].set_addr (num_pushes
- 1);
684 for (from
= AVR_LAST_PUSHED_REGNUM
+ 1 - (num_pushes
- 2);
685 from
<= AVR_LAST_PUSHED_REGNUM
; ++from
)
686 info
->saved_regs
[from
].set_addr (++i
);
688 info
->size
= loc_size
+ num_pushes
;
689 info
->prologue_type
= AVR_PROLOGUE_CALL
;
691 return pc_beg
+ pc_offset
;
694 /* Scan for the beginning of the prologue for an interrupt or signal
695 function. Note that we have to set the prologue type here since the
696 third stage of the prologue may not be present (e.g. no saved registered
697 or changing of the SP register). */
701 static const unsigned char img
[] = {
702 0x78, 0x94, /* sei */
703 0x1f, 0x92, /* push r1 */
704 0x0f, 0x92, /* push r0 */
705 0x0f, 0xb6, /* in r0,0x3f SREG */
706 0x0f, 0x92, /* push r0 */
707 0x11, 0x24 /* clr r1 */
709 if (len
>= sizeof (img
)
710 && memcmp (prologue
, img
, sizeof (img
)) == 0)
712 info
->prologue_type
= AVR_PROLOGUE_INTR
;
714 info
->saved_regs
[AVR_SREG_REGNUM
].set_addr (3);
715 info
->saved_regs
[0].set_addr (2);
716 info
->saved_regs
[1].set_addr (1);
719 else if (len
>= sizeof (img
) - 2
720 && memcmp (img
+ 2, prologue
, sizeof (img
) - 2) == 0)
722 info
->prologue_type
= AVR_PROLOGUE_SIG
;
723 vpc
+= sizeof (img
) - 2;
724 info
->saved_regs
[AVR_SREG_REGNUM
].set_addr (3);
725 info
->saved_regs
[0].set_addr (2);
726 info
->saved_regs
[1].set_addr (1);
731 /* First stage of the prologue scanning.
732 Scan pushes (saved registers) */
734 for (; vpc
< len
; vpc
+= 2)
736 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
737 if ((insn
& 0xfe0f) == 0x920f) /* push rXX */
739 /* Bits 4-9 contain a mask for registers R0-R32. */
740 int regno
= (insn
& 0x1f0) >> 4;
742 info
->saved_regs
[regno
].set_addr (info
->size
);
749 gdb_assert (vpc
< AVR_MAX_PROLOGUE_SIZE
);
751 /* Handle static small stack allocation using rcall or push. */
752 avr_gdbarch_tdep
*tdep
= (avr_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
753 while (scan_stage
== 1 && vpc
< len
)
755 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
756 if (insn
== 0xd000) /* rcall .+0 */
758 info
->size
+= tdep
->call_length
;
761 else if (insn
== 0x920f || insn
== 0x921f) /* push r0 or push r1 */
770 /* Second stage of the prologue scanning.
775 if (scan_stage
== 1 && vpc
< len
)
777 static const unsigned char img
[] = {
778 0xcd, 0xb7, /* in r28,__SP_L__ */
779 0xde, 0xb7 /* in r29,__SP_H__ */
782 if (vpc
+ sizeof (img
) < len
783 && memcmp (prologue
+ vpc
, img
, sizeof (img
)) == 0)
790 /* Third stage of the prologue scanning. (Really two stages).
792 sbiw r28,XX or subi r28,lo8(XX)
794 in __tmp_reg__,__SREG__
797 out __SREG__,__tmp_reg__
800 if (scan_stage
== 2 && vpc
< len
)
803 static const unsigned char img
[] = {
804 0x0f, 0xb6, /* in r0,0x3f */
805 0xf8, 0x94, /* cli */
806 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
807 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */
808 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
810 static const unsigned char img_sig
[] = {
811 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
812 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
814 static const unsigned char img_int
[] = {
815 0xf8, 0x94, /* cli */
816 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
817 0x78, 0x94, /* sei */
818 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
821 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
822 if ((insn
& 0xff30) == 0x9720) /* sbiw r28,XXX */
824 locals_size
= (insn
& 0xf) | ((insn
& 0xc0) >> 2);
827 else if ((insn
& 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
829 locals_size
= (insn
& 0xf) | ((insn
& 0xf00) >> 4);
831 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
833 locals_size
+= ((insn
& 0xf) | ((insn
& 0xf00) >> 4)) << 8;
838 /* Scan the last part of the prologue. May not be present for interrupt
839 or signal handler functions, which is why we set the prologue type
840 when we saw the beginning of the prologue previously. */
842 if (vpc
+ sizeof (img_sig
) < len
843 && memcmp (prologue
+ vpc
, img_sig
, sizeof (img_sig
)) == 0)
845 vpc
+= sizeof (img_sig
);
847 else if (vpc
+ sizeof (img_int
) < len
848 && memcmp (prologue
+ vpc
, img_int
, sizeof (img_int
)) == 0)
850 vpc
+= sizeof (img_int
);
852 if (vpc
+ sizeof (img
) < len
853 && memcmp (prologue
+ vpc
, img
, sizeof (img
)) == 0)
855 info
->prologue_type
= AVR_PROLOGUE_NORMAL
;
859 info
->size
+= locals_size
;
864 /* If we got this far, we could not scan the prologue, so just return the pc
865 of the frame plus an adjustment for argument move insns. */
867 for (; vpc
< len
; vpc
+= 2)
869 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
870 if ((insn
& 0xff00) == 0x0100) /* movw rXX, rYY */
872 else if ((insn
& 0xfc00) == 0x2c00) /* mov rXX, rYY */
882 avr_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
884 CORE_ADDR func_addr
, func_end
;
885 CORE_ADDR post_prologue_pc
;
887 /* See what the symbol table says */
889 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
892 post_prologue_pc
= skip_prologue_using_sal (gdbarch
, func_addr
);
893 if (post_prologue_pc
!= 0)
894 return std::max (pc
, post_prologue_pc
);
897 CORE_ADDR prologue_end
= pc
;
898 struct avr_unwind_cache info
= {0};
899 trad_frame_saved_reg saved_regs
[AVR_NUM_REGS
];
901 info
.saved_regs
= saved_regs
;
903 /* Need to run the prologue scanner to figure out if the function has a
904 prologue and possibly skip over moving arguments passed via registers
905 to other registers. */
907 prologue_end
= avr_scan_prologue (gdbarch
, func_addr
, func_end
, &info
);
909 if (info
.prologue_type
!= AVR_PROLOGUE_NONE
)
913 /* Either we didn't find the start of this function (nothing we can do),
914 or there's no line info, or the line after the prologue is after
915 the end of the function (there probably isn't a prologue). */
920 /* Not all avr devices support the BREAK insn. Those that don't should treat
921 it as a NOP. Thus, it should be ok. Since the avr is currently a remote
922 only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
924 constexpr gdb_byte avr_break_insn
[] = { 0x98, 0x95 };
926 typedef BP_MANIPULATION (avr_break_insn
) avr_breakpoint
;
928 /* Determine, for architecture GDBARCH, how a return value of TYPE
929 should be returned. If it is supposed to be returned in registers,
930 and READBUF is non-zero, read the appropriate value from REGCACHE,
931 and copy it into READBUF. If WRITEBUF is non-zero, write the value
932 from WRITEBUF into REGCACHE. */
934 static enum return_value_convention
935 avr_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
936 struct type
*valtype
, struct regcache
*regcache
,
937 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
940 /* Single byte are returned in r24.
941 Otherwise, the MSB of the return value is always in r25, calculate which
942 register holds the LSB. */
945 if ((valtype
->code () == TYPE_CODE_STRUCT
946 || valtype
->code () == TYPE_CODE_UNION
947 || valtype
->code () == TYPE_CODE_ARRAY
)
948 && TYPE_LENGTH (valtype
) > 8)
949 return RETURN_VALUE_STRUCT_CONVENTION
;
951 if (TYPE_LENGTH (valtype
) <= 2)
953 else if (TYPE_LENGTH (valtype
) <= 4)
955 else if (TYPE_LENGTH (valtype
) <= 8)
958 gdb_assert_not_reached ("unexpected type length");
960 if (writebuf
!= NULL
)
962 for (i
= 0; i
< TYPE_LENGTH (valtype
); i
++)
963 regcache
->cooked_write (lsb_reg
+ i
, writebuf
+ i
);
968 for (i
= 0; i
< TYPE_LENGTH (valtype
); i
++)
969 regcache
->cooked_read (lsb_reg
+ i
, readbuf
+ i
);
972 return RETURN_VALUE_REGISTER_CONVENTION
;
976 /* Put here the code to store, into fi->saved_regs, the addresses of
977 the saved registers of frame described by FRAME_INFO. This
978 includes special registers such as pc and fp saved in special ways
979 in the stack frame. sp is even more special: the address we return
980 for it IS the sp for the next frame. */
982 static struct avr_unwind_cache
*
983 avr_frame_unwind_cache (struct frame_info
*this_frame
,
984 void **this_prologue_cache
)
986 CORE_ADDR start_pc
, current_pc
;
989 struct avr_unwind_cache
*info
;
990 struct gdbarch
*gdbarch
;
993 if (*this_prologue_cache
)
994 return (struct avr_unwind_cache
*) *this_prologue_cache
;
996 info
= FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache
);
997 *this_prologue_cache
= info
;
998 info
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
1001 info
->prologue_type
= AVR_PROLOGUE_NONE
;
1003 start_pc
= get_frame_func (this_frame
);
1004 current_pc
= get_frame_pc (this_frame
);
1005 if ((start_pc
> 0) && (start_pc
<= current_pc
))
1006 avr_scan_prologue (get_frame_arch (this_frame
),
1007 start_pc
, current_pc
, info
);
1009 if ((info
->prologue_type
!= AVR_PROLOGUE_NONE
)
1010 && (info
->prologue_type
!= AVR_PROLOGUE_MAIN
))
1012 ULONGEST high_base
; /* High byte of FP */
1014 /* The SP was moved to the FP. This indicates that a new frame
1015 was created. Get THIS frame's FP value by unwinding it from
1017 this_base
= get_frame_register_unsigned (this_frame
, AVR_FP_REGNUM
);
1018 high_base
= get_frame_register_unsigned (this_frame
, AVR_FP_REGNUM
+ 1);
1019 this_base
+= (high_base
<< 8);
1021 /* The FP points at the last saved register. Adjust the FP back
1022 to before the first saved register giving the SP. */
1023 prev_sp
= this_base
+ info
->size
;
1027 /* Assume that the FP is this frame's SP but with that pushed
1028 stack space added back. */
1029 this_base
= get_frame_register_unsigned (this_frame
, AVR_SP_REGNUM
);
1030 prev_sp
= this_base
+ info
->size
;
1033 /* Add 1 here to adjust for the post-decrement nature of the push
1035 info
->prev_sp
= avr_make_saddr (prev_sp
+ 1);
1036 info
->base
= avr_make_saddr (this_base
);
1038 gdbarch
= get_frame_arch (this_frame
);
1040 /* Adjust all the saved registers so that they contain addresses and not
1042 for (i
= 0; i
< gdbarch_num_regs (gdbarch
) - 1; i
++)
1043 if (info
->saved_regs
[i
].is_addr ())
1044 info
->saved_regs
[i
].set_addr (info
->prev_sp
1045 - info
->saved_regs
[i
].addr ());
1047 /* Except for the main and startup code, the return PC is always saved on
1048 the stack and is at the base of the frame. */
1050 if (info
->prologue_type
!= AVR_PROLOGUE_MAIN
)
1051 info
->saved_regs
[AVR_PC_REGNUM
].set_addr (info
->prev_sp
);
1053 /* The previous frame's SP needed to be computed. Save the computed
1055 avr_gdbarch_tdep
*tdep
= (avr_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
1056 info
->saved_regs
[AVR_SP_REGNUM
].set_value (info
->prev_sp
1057 - 1 + tdep
->call_length
);
1063 avr_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1067 pc
= frame_unwind_register_unsigned (next_frame
, AVR_PC_REGNUM
);
1069 return avr_make_iaddr (pc
);
1073 avr_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1077 sp
= frame_unwind_register_unsigned (next_frame
, AVR_SP_REGNUM
);
1079 return avr_make_saddr (sp
);
1082 /* Given a GDB frame, determine the address of the calling function's
1083 frame. This will be used to create a new GDB frame struct. */
1086 avr_frame_this_id (struct frame_info
*this_frame
,
1087 void **this_prologue_cache
,
1088 struct frame_id
*this_id
)
1090 struct avr_unwind_cache
*info
1091 = avr_frame_unwind_cache (this_frame
, this_prologue_cache
);
1096 /* The FUNC is easy. */
1097 func
= get_frame_func (this_frame
);
1099 /* Hopefully the prologue analysis either correctly determined the
1100 frame's base (which is the SP from the previous frame), or set
1101 that base to "NULL". */
1102 base
= info
->prev_sp
;
1106 id
= frame_id_build (base
, func
);
1110 static struct value
*
1111 avr_frame_prev_register (struct frame_info
*this_frame
,
1112 void **this_prologue_cache
, int regnum
)
1114 struct avr_unwind_cache
*info
1115 = avr_frame_unwind_cache (this_frame
, this_prologue_cache
);
1117 if (regnum
== AVR_PC_REGNUM
|| regnum
== AVR_PSEUDO_PC_REGNUM
)
1119 if (info
->saved_regs
[AVR_PC_REGNUM
].is_addr ())
1121 /* Reading the return PC from the PC register is slightly
1122 abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes,
1123 but in reality, only two bytes (3 in upcoming mega256) are
1124 stored on the stack.
1126 Also, note that the value on the stack is an addr to a word
1127 not a byte, so we will need to multiply it by two at some
1130 And to confuse matters even more, the return address stored
1131 on the stack is in big endian byte order, even though most
1132 everything else about the avr is little endian. Ick! */
1136 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1137 avr_gdbarch_tdep
*tdep
= (avr_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
1139 read_memory (info
->saved_regs
[AVR_PC_REGNUM
].addr (),
1140 buf
, tdep
->call_length
);
1142 /* Extract the PC read from memory as a big-endian. */
1144 for (i
= 0; i
< tdep
->call_length
; i
++)
1145 pc
= (pc
<< 8) | buf
[i
];
1147 if (regnum
== AVR_PC_REGNUM
)
1150 return frame_unwind_got_constant (this_frame
, regnum
, pc
);
1153 return frame_unwind_got_optimized (this_frame
, regnum
);
1156 return trad_frame_get_prev_register (this_frame
, info
->saved_regs
, regnum
);
1159 static const struct frame_unwind avr_frame_unwind
= {
1162 default_frame_unwind_stop_reason
,
1164 avr_frame_prev_register
,
1166 default_frame_sniffer
1170 avr_frame_base_address (struct frame_info
*this_frame
, void **this_cache
)
1172 struct avr_unwind_cache
*info
1173 = avr_frame_unwind_cache (this_frame
, this_cache
);
1178 static const struct frame_base avr_frame_base
= {
1180 avr_frame_base_address
,
1181 avr_frame_base_address
,
1182 avr_frame_base_address
1185 /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy
1186 frame. The frame ID's base needs to match the TOS value saved by
1187 save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */
1189 static struct frame_id
1190 avr_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
1194 base
= get_frame_register_unsigned (this_frame
, AVR_SP_REGNUM
);
1195 return frame_id_build (avr_make_saddr (base
), get_frame_pc (this_frame
));
1198 /* When arguments must be pushed onto the stack, they go on in reverse
1199 order. The below implements a FILO (stack) to do this. */
1204 struct stack_item
*prev
;
1208 static struct stack_item
*
1209 push_stack_item (struct stack_item
*prev
, const bfd_byte
*contents
, int len
)
1211 struct stack_item
*si
;
1212 si
= XNEW (struct stack_item
);
1213 si
->data
= (gdb_byte
*) xmalloc (len
);
1216 memcpy (si
->data
, contents
, len
);
1220 static struct stack_item
*pop_stack_item (struct stack_item
*si
);
1221 static struct stack_item
*
1222 pop_stack_item (struct stack_item
*si
)
1224 struct stack_item
*dead
= si
;
1231 /* Setup the function arguments for calling a function in the inferior.
1233 On the AVR architecture, there are 18 registers (R25 to R8) which are
1234 dedicated for passing function arguments. Up to the first 18 arguments
1235 (depending on size) may go into these registers. The rest go on the stack.
1237 All arguments are aligned to start in even-numbered registers (odd-sized
1238 arguments, including char, have one free register above them). For example,
1239 an int in arg1 and a char in arg2 would be passed as such:
1244 Arguments that are larger than 2 bytes will be split between two or more
1245 registers as available, but will NOT be split between a register and the
1246 stack. Arguments that go onto the stack are pushed last arg first (this is
1247 similar to the d10v). */
1249 /* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be
1252 An exceptional case exists for struct arguments (and possibly other
1253 aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but
1254 not a multiple of WORDSIZE bytes. In this case the argument is never split
1255 between the registers and the stack, but instead is copied in its entirety
1256 onto the stack, AND also copied into as many registers as there is room
1257 for. In other words, space in registers permitting, two copies of the same
1258 argument are passed in. As far as I can tell, only the one on the stack is
1259 used, although that may be a function of the level of compiler
1260 optimization. I suspect this is a compiler bug. Arguments of these odd
1261 sizes are left-justified within the word (as opposed to arguments smaller
1262 than WORDSIZE bytes, which are right-justified).
1264 If the function is to return an aggregate type such as a struct, the caller
1265 must allocate space into which the callee will copy the return value. In
1266 this case, a pointer to the return value location is passed into the callee
1267 in register R0, which displaces one of the other arguments passed in via
1268 registers R0 to R2. */
1271 avr_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
1272 struct regcache
*regcache
, CORE_ADDR bp_addr
,
1273 int nargs
, struct value
**args
, CORE_ADDR sp
,
1274 function_call_return_method return_method
,
1275 CORE_ADDR struct_addr
)
1279 avr_gdbarch_tdep
*tdep
= (avr_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
1280 int call_length
= tdep
->call_length
;
1281 CORE_ADDR return_pc
= avr_convert_iaddr_to_raw (bp_addr
);
1282 int regnum
= AVR_ARGN_REGNUM
;
1283 struct stack_item
*si
= NULL
;
1285 if (return_method
== return_method_struct
)
1287 regcache_cooked_write_unsigned
1288 (regcache
, regnum
--, (struct_addr
>> 8) & 0xff);
1289 regcache_cooked_write_unsigned
1290 (regcache
, regnum
--, struct_addr
& 0xff);
1291 /* SP being post decremented, we need to reserve one byte so that the
1292 return address won't overwrite the result (or vice-versa). */
1293 if (sp
== struct_addr
)
1297 for (i
= 0; i
< nargs
; i
++)
1301 struct value
*arg
= args
[i
];
1302 struct type
*type
= check_typedef (value_type (arg
));
1303 const bfd_byte
*contents
= value_contents (arg
).data ();
1304 int len
= TYPE_LENGTH (type
);
1306 /* Calculate the potential last register needed.
1307 E.g. For length 2, registers regnum and regnum-1 (say 25 and 24)
1308 shall be used. So, last needed register will be regnum-1(24). */
1309 last_regnum
= regnum
- (len
+ (len
& 1)) + 1;
1311 /* If there are registers available, use them. Once we start putting
1312 stuff on the stack, all subsequent args go on stack. */
1313 if ((si
== NULL
) && (last_regnum
>= AVR_LAST_ARG_REGNUM
))
1315 /* Skip a register for odd length args. */
1319 /* Write MSB of argument into register and subsequent bytes in
1320 decreasing register numbers. */
1321 for (j
= 0; j
< len
; j
++)
1322 regcache_cooked_write_unsigned
1323 (regcache
, regnum
--, contents
[len
- j
- 1]);
1325 /* No registers available, push the args onto the stack. */
1328 /* From here on, we don't care about regnum. */
1329 si
= push_stack_item (si
, contents
, len
);
1333 /* Push args onto the stack. */
1337 /* Add 1 to sp here to account for post decr nature of pushes. */
1338 write_memory (sp
+ 1, si
->data
, si
->len
);
1339 si
= pop_stack_item (si
);
1342 /* Set the return address. For the avr, the return address is the BP_ADDR.
1343 Need to push the return address onto the stack noting that it needs to be
1344 in big-endian order on the stack. */
1345 for (i
= 1; i
<= call_length
; i
++)
1347 buf
[call_length
- i
] = return_pc
& 0xff;
1352 /* Use 'sp + 1' since pushes are post decr ops. */
1353 write_memory (sp
+ 1, buf
, call_length
);
1355 /* Finally, update the SP register. */
1356 regcache_cooked_write_unsigned (regcache
, AVR_SP_REGNUM
,
1357 avr_convert_saddr_to_raw (sp
));
1359 /* Return SP value for the dummy frame, where the return address hasn't been
1361 return sp
+ call_length
;
1364 /* Unfortunately dwarf2 register for SP is 32. */
1367 avr_dwarf_reg_to_regnum (struct gdbarch
*gdbarch
, int reg
)
1369 if (reg
>= 0 && reg
< 32)
1372 return AVR_SP_REGNUM
;
1376 /* Implementation of `address_class_type_flags' gdbarch method.
1378 This method maps DW_AT_address_class attributes to a
1379 type_instance_flag_value. */
1381 static type_instance_flags
1382 avr_address_class_type_flags (int byte_size
, int dwarf2_addr_class
)
1384 /* The value 1 of the DW_AT_address_class attribute corresponds to the
1385 __flash qualifier. Note that this attribute is only valid with
1386 pointer types and therefore the flag is set to the pointer type and
1387 not its target type. */
1388 if (dwarf2_addr_class
== 1 && byte_size
== 2)
1389 return AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH
;
1393 /* Implementation of `address_class_type_flags_to_name' gdbarch method.
1395 Convert a type_instance_flag_value to an address space qualifier. */
1398 avr_address_class_type_flags_to_name (struct gdbarch
*gdbarch
,
1399 type_instance_flags type_flags
)
1401 if (type_flags
& AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH
)
1407 /* Implementation of `address_class_name_to_type_flags' gdbarch method.
1409 Convert an address space qualifier to a type_instance_flag_value. */
1412 avr_address_class_name_to_type_flags (struct gdbarch
*gdbarch
,
1414 type_instance_flags
*type_flags_ptr
)
1416 if (strcmp (name
, "flash") == 0)
1418 *type_flags_ptr
= AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH
;
1425 /* Initialize the gdbarch structure for the AVR's. */
1427 static struct gdbarch
*
1428 avr_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1430 struct gdbarch
*gdbarch
;
1431 struct gdbarch_list
*best_arch
;
1434 /* Avr-6 call instructions save 3 bytes. */
1435 switch (info
.bfd_arch_info
->mach
)
1438 case bfd_mach_avrxmega1
:
1440 case bfd_mach_avrxmega2
:
1442 case bfd_mach_avrxmega3
:
1444 case bfd_mach_avrxmega4
:
1446 case bfd_mach_avrxmega5
:
1451 case bfd_mach_avrxmega6
:
1452 case bfd_mach_avrxmega7
:
1457 /* If there is already a candidate, use it. */
1458 for (best_arch
= gdbarch_list_lookup_by_info (arches
, &info
);
1460 best_arch
= gdbarch_list_lookup_by_info (best_arch
->next
, &info
))
1462 avr_gdbarch_tdep
*tdep
1463 = (avr_gdbarch_tdep
*) gdbarch_tdep (best_arch
->gdbarch
);
1465 if (tdep
->call_length
== call_length
)
1466 return best_arch
->gdbarch
;
1469 /* None found, create a new architecture from the information provided. */
1470 avr_gdbarch_tdep
*tdep
= new avr_gdbarch_tdep
;
1471 gdbarch
= gdbarch_alloc (&info
, tdep
);
1473 tdep
->call_length
= call_length
;
1475 /* Create a type for PC. We can't use builtin types here, as they may not
1477 tdep
->void_type
= arch_type (gdbarch
, TYPE_CODE_VOID
, TARGET_CHAR_BIT
,
1479 tdep
->func_void_type
= make_function_type (tdep
->void_type
, NULL
);
1480 tdep
->pc_type
= arch_pointer_type (gdbarch
, 4 * TARGET_CHAR_BIT
, NULL
,
1481 tdep
->func_void_type
);
1483 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1484 set_gdbarch_int_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1485 set_gdbarch_long_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1486 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
1487 set_gdbarch_ptr_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1488 set_gdbarch_addr_bit (gdbarch
, 32);
1490 set_gdbarch_wchar_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1491 set_gdbarch_wchar_signed (gdbarch
, 1);
1493 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1494 set_gdbarch_double_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1495 set_gdbarch_long_double_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1497 set_gdbarch_float_format (gdbarch
, floatformats_ieee_single
);
1498 set_gdbarch_double_format (gdbarch
, floatformats_ieee_single
);
1499 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_single
);
1501 set_gdbarch_read_pc (gdbarch
, avr_read_pc
);
1502 set_gdbarch_write_pc (gdbarch
, avr_write_pc
);
1504 set_gdbarch_num_regs (gdbarch
, AVR_NUM_REGS
);
1506 set_gdbarch_sp_regnum (gdbarch
, AVR_SP_REGNUM
);
1507 set_gdbarch_pc_regnum (gdbarch
, AVR_PC_REGNUM
);
1509 set_gdbarch_register_name (gdbarch
, avr_register_name
);
1510 set_gdbarch_register_type (gdbarch
, avr_register_type
);
1512 set_gdbarch_num_pseudo_regs (gdbarch
, AVR_NUM_PSEUDO_REGS
);
1513 set_gdbarch_pseudo_register_read (gdbarch
, avr_pseudo_register_read
);
1514 set_gdbarch_pseudo_register_write (gdbarch
, avr_pseudo_register_write
);
1516 set_gdbarch_return_value (gdbarch
, avr_return_value
);
1518 set_gdbarch_push_dummy_call (gdbarch
, avr_push_dummy_call
);
1520 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, avr_dwarf_reg_to_regnum
);
1522 set_gdbarch_address_to_pointer (gdbarch
, avr_address_to_pointer
);
1523 set_gdbarch_pointer_to_address (gdbarch
, avr_pointer_to_address
);
1524 set_gdbarch_integer_to_address (gdbarch
, avr_integer_to_address
);
1526 set_gdbarch_skip_prologue (gdbarch
, avr_skip_prologue
);
1527 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1529 set_gdbarch_breakpoint_kind_from_pc (gdbarch
, avr_breakpoint::kind_from_pc
);
1530 set_gdbarch_sw_breakpoint_from_kind (gdbarch
, avr_breakpoint::bp_from_kind
);
1532 frame_unwind_append_unwinder (gdbarch
, &avr_frame_unwind
);
1533 frame_base_set_default (gdbarch
, &avr_frame_base
);
1535 set_gdbarch_dummy_id (gdbarch
, avr_dummy_id
);
1537 set_gdbarch_unwind_pc (gdbarch
, avr_unwind_pc
);
1538 set_gdbarch_unwind_sp (gdbarch
, avr_unwind_sp
);
1540 set_gdbarch_address_class_type_flags (gdbarch
, avr_address_class_type_flags
);
1541 set_gdbarch_address_class_name_to_type_flags
1542 (gdbarch
, avr_address_class_name_to_type_flags
);
1543 set_gdbarch_address_class_type_flags_to_name
1544 (gdbarch
, avr_address_class_type_flags_to_name
);
1549 /* Send a query request to the avr remote target asking for values of the io
1550 registers. If args parameter is not NULL, then the user has requested info
1551 on a specific io register [This still needs implemented and is ignored for
1552 now]. The query string should be one of these forms:
1554 "Ravr.io_reg" -> reply is "NN" number of io registers
1556 "Ravr.io_reg:addr,len" where addr is first register and len is number of
1557 registers to be read. The reply should be "<NAME>,VV;" for each io register
1558 where, <NAME> is a string, and VV is the hex value of the register.
1560 All io registers are 8-bit. */
1563 avr_io_reg_read_command (const char *args
, int from_tty
)
1566 unsigned int nreg
= 0;
1569 /* Find out how many io registers the target has. */
1570 gdb::optional
<gdb::byte_vector
> buf
1571 = target_read_alloc (current_inferior ()->top_target (),
1572 TARGET_OBJECT_AVR
, "avr.io_reg");
1576 fprintf_unfiltered (gdb_stderr
,
1577 _("ERR: info io_registers NOT supported "
1578 "by current target\n"));
1582 const char *bufstr
= (const char *) buf
->data ();
1584 if (sscanf (bufstr
, "%x", &nreg
) != 1)
1586 fprintf_unfiltered (gdb_stderr
,
1587 _("Error fetching number of io registers\n"));
1591 reinitialize_more_filter ();
1593 printf_unfiltered (_("Target has %u io registers:\n\n"), nreg
);
1595 /* only fetch up to 8 registers at a time to keep the buffer small */
1598 for (int i
= 0; i
< nreg
; i
+= step
)
1600 /* how many registers this round? */
1603 j
= nreg
- i
; /* last block is less than 8 registers */
1605 snprintf (query
, sizeof (query
) - 1, "avr.io_reg:%x,%x", i
, j
);
1606 buf
= target_read_alloc (current_inferior ()->top_target (),
1607 TARGET_OBJECT_AVR
, query
);
1611 fprintf_unfiltered (gdb_stderr
,
1612 _("ERR: error reading avr.io_reg:%x,%x\n"),
1617 const char *p
= (const char *) buf
->data ();
1618 for (int k
= i
; k
< (i
+ j
); k
++)
1620 if (sscanf (p
, "%[^,],%x;", query
, &val
) == 2)
1622 printf_filtered ("[%02x] %-15s : %02x\n", k
, query
, val
);
1623 while ((*p
!= ';') && (*p
!= '\0'))
1625 p
++; /* skip over ';' */
1633 void _initialize_avr_tdep ();
1635 _initialize_avr_tdep ()
1637 register_gdbarch_init (bfd_arch_avr
, avr_gdbarch_init
);
1639 /* Add a new command to allow the user to query the avr remote target for
1640 the values of the io space registers in a saner way than just using
1643 /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
1644 io_registers' to signify it is not available on other platforms. */
1646 add_info ("io_registers", avr_io_reg_read_command
,
1647 _("Query remote AVR target for I/O space register values."));