1 /* Target-dependent code for Atmel AVR, for GDB.
3 Copyright (C) 1996-2014 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"
42 (AVR micros are pure Harvard Architecture processors.)
44 The AVR family of microcontrollers have three distinctly different memory
45 spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for
46 the most part to store program instructions. The sram is 8 bits wide and is
47 used for the stack and the heap. Some devices lack sram and some can have
48 an additional external sram added on as a peripheral.
50 The eeprom is 8 bits wide and is used to store data when the device is
51 powered down. Eeprom is not directly accessible, it can only be accessed
52 via io-registers using a special algorithm. Accessing eeprom via gdb's
53 remote serial protocol ('m' or 'M' packets) looks difficult to do and is
54 not included at this time.
56 [The eeprom could be read manually via ``x/b <eaddr + AVR_EMEM_START>'' or
57 written using ``set {unsigned char}<eaddr + AVR_EMEM_START>''. For this to
58 work, the remote target must be able to handle eeprom accesses and perform
59 the address translation.]
61 All three memory spaces have physical addresses beginning at 0x0. In
62 addition, the flash is addressed by gcc/binutils/gdb with respect to 8 bit
63 bytes instead of the 16 bit wide words used by the real device for the
66 In order for remote targets to work correctly, extra bits must be added to
67 addresses before they are send to the target or received from the target
68 via the remote serial protocol. The extra bits are the MSBs and are used to
69 decode which memory space the address is referring to. */
71 /* Constants: prefixed with AVR_ to avoid name space clashes */
85 AVR_NUM_REGS
= 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/,
86 AVR_NUM_REG_BYTES
= 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/,
88 /* Pseudo registers. */
89 AVR_PSEUDO_PC_REGNUM
= 35,
90 AVR_NUM_PSEUDO_REGS
= 1,
92 AVR_PC_REG_INDEX
= 35, /* index into array of registers */
94 AVR_MAX_PROLOGUE_SIZE
= 64, /* bytes */
96 /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */
99 /* Number of the last pushed register. r17 for current avr-gcc */
100 AVR_LAST_PUSHED_REGNUM
= 17,
102 AVR_ARG1_REGNUM
= 24, /* Single byte argument */
103 AVR_ARGN_REGNUM
= 25, /* Multi byte argments */
105 AVR_RET1_REGNUM
= 24, /* Single byte return value */
106 AVR_RETN_REGNUM
= 25, /* Multi byte return value */
108 /* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8
109 bits? Do these have to match the bfd vma values? It sure would make
110 things easier in the future if they didn't need to match.
112 Note: I chose these values so as to be consistent with bfd vma
115 TRoth/2002-04-08: There is already a conflict with very large programs
116 in the mega128. The mega128 has 128K instruction bytes (64K words),
117 thus the Most Significant Bit is 0x10000 which gets masked off my
120 The problem manifests itself when trying to set a breakpoint in a
121 function which resides in the upper half of the instruction space and
122 thus requires a 17-bit address.
124 For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK
125 from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
126 but could be for some remote targets by just adding the correct offset
127 to the address and letting the remote target handle the low-level
128 details of actually accessing the eeprom. */
130 AVR_IMEM_START
= 0x00000000, /* INSN memory */
131 AVR_SMEM_START
= 0x00800000, /* SRAM memory */
133 /* No eeprom mask defined */
134 AVR_MEM_MASK
= 0x00f00000, /* mask to determine memory space */
136 AVR_EMEM_START
= 0x00810000, /* EEPROM memory */
137 AVR_MEM_MASK
= 0x00ff0000, /* mask to determine memory space */
143 NORMAL and CALL are the typical types (the -mcall-prologues gcc option
144 causes the generation of the CALL type prologues). */
147 AVR_PROLOGUE_NONE
, /* No prologue */
149 AVR_PROLOGUE_CALL
, /* -mcall-prologues */
151 AVR_PROLOGUE_INTR
, /* interrupt handler */
152 AVR_PROLOGUE_SIG
, /* signal handler */
155 /* Any function with a frame looks like this
156 ....... <-SP POINTS HERE
157 LOCALS1 <-FP POINTS HERE
166 struct avr_unwind_cache
168 /* The previous frame's inner most stack address. Used as this
169 frame ID's stack_addr. */
171 /* The frame's base, optionally used by the high-level debug info. */
175 /* Table indicating the location of each and every register. */
176 struct trad_frame_saved_reg
*saved_regs
;
181 /* Number of bytes stored to the stack by call instructions.
182 2 bytes for avr1-5, 3 bytes for avr6. */
186 struct type
*void_type
;
187 /* Type for a function returning void. */
188 struct type
*func_void_type
;
189 /* Type for a pointer to a function. Used for the type of PC. */
190 struct type
*pc_type
;
193 /* Lookup the name of a register given it's number. */
196 avr_register_name (struct gdbarch
*gdbarch
, int regnum
)
198 static const char * const register_names
[] = {
199 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
200 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
201 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
202 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
208 if (regnum
>= (sizeof (register_names
) / sizeof (*register_names
)))
210 return register_names
[regnum
];
213 /* Return the GDB type object for the "standard" data type
214 of data in register N. */
217 avr_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
219 if (reg_nr
== AVR_PC_REGNUM
)
220 return builtin_type (gdbarch
)->builtin_uint32
;
221 if (reg_nr
== AVR_PSEUDO_PC_REGNUM
)
222 return gdbarch_tdep (gdbarch
)->pc_type
;
223 if (reg_nr
== AVR_SP_REGNUM
)
224 return builtin_type (gdbarch
)->builtin_data_ptr
;
225 return builtin_type (gdbarch
)->builtin_uint8
;
228 /* Instruction address checks and convertions. */
231 avr_make_iaddr (CORE_ADDR x
)
233 return ((x
) | AVR_IMEM_START
);
236 /* FIXME: TRoth: Really need to use a larger mask for instructions. Some
237 devices are already up to 128KBytes of flash space.
239 TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
242 avr_convert_iaddr_to_raw (CORE_ADDR x
)
244 return ((x
) & 0xffffffff);
247 /* SRAM address checks and convertions. */
250 avr_make_saddr (CORE_ADDR x
)
252 /* Return 0 for NULL. */
256 return ((x
) | AVR_SMEM_START
);
260 avr_convert_saddr_to_raw (CORE_ADDR x
)
262 return ((x
) & 0xffffffff);
265 /* EEPROM address checks and convertions. I don't know if these will ever
266 actually be used, but I've added them just the same. TRoth */
268 /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
269 programs in the mega128. */
271 /* static CORE_ADDR */
272 /* avr_make_eaddr (CORE_ADDR x) */
274 /* return ((x) | AVR_EMEM_START); */
278 /* avr_eaddr_p (CORE_ADDR x) */
280 /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */
283 /* static CORE_ADDR */
284 /* avr_convert_eaddr_to_raw (CORE_ADDR x) */
286 /* return ((x) & 0xffffffff); */
289 /* Convert from address to pointer and vice-versa. */
292 avr_address_to_pointer (struct gdbarch
*gdbarch
,
293 struct type
*type
, gdb_byte
*buf
, CORE_ADDR addr
)
295 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
297 /* Is it a code address? */
298 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_FUNC
299 || TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_METHOD
)
301 store_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
,
302 avr_convert_iaddr_to_raw (addr
>> 1));
306 /* Strip off any upper segment bits. */
307 store_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
,
308 avr_convert_saddr_to_raw (addr
));
313 avr_pointer_to_address (struct gdbarch
*gdbarch
,
314 struct type
*type
, const gdb_byte
*buf
)
316 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
318 = extract_unsigned_integer (buf
, TYPE_LENGTH (type
), byte_order
);
320 /* Is it a code address? */
321 if (TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_FUNC
322 || TYPE_CODE (TYPE_TARGET_TYPE (type
)) == TYPE_CODE_METHOD
323 || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type
)))
324 return avr_make_iaddr (addr
<< 1);
326 return avr_make_saddr (addr
);
330 avr_integer_to_address (struct gdbarch
*gdbarch
,
331 struct type
*type
, const gdb_byte
*buf
)
333 ULONGEST addr
= unpack_long (type
, buf
);
335 return avr_make_saddr (addr
);
339 avr_read_pc (struct regcache
*regcache
)
342 regcache_cooked_read_unsigned (regcache
, AVR_PC_REGNUM
, &pc
);
343 return avr_make_iaddr (pc
);
347 avr_write_pc (struct regcache
*regcache
, CORE_ADDR val
)
349 regcache_cooked_write_unsigned (regcache
, AVR_PC_REGNUM
,
350 avr_convert_iaddr_to_raw (val
));
353 static enum register_status
354 avr_pseudo_register_read (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
355 int regnum
, gdb_byte
*buf
)
358 enum register_status status
;
362 case AVR_PSEUDO_PC_REGNUM
:
363 status
= regcache_raw_read_unsigned (regcache
, AVR_PC_REGNUM
, &val
);
364 if (status
!= REG_VALID
)
367 store_unsigned_integer (buf
, 4, gdbarch_byte_order (gdbarch
), val
);
370 internal_error (__FILE__
, __LINE__
, _("invalid regnum"));
375 avr_pseudo_register_write (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
376 int regnum
, const gdb_byte
*buf
)
382 case AVR_PSEUDO_PC_REGNUM
:
383 val
= extract_unsigned_integer (buf
, 4, gdbarch_byte_order (gdbarch
));
385 regcache_raw_write_unsigned (regcache
, AVR_PC_REGNUM
, val
);
388 internal_error (__FILE__
, __LINE__
, _("invalid regnum"));
392 /* Function: avr_scan_prologue
394 This function decodes an AVR function prologue to determine:
395 1) the size of the stack frame
396 2) which registers are saved on it
397 3) the offsets of saved regs
398 This information is stored in the avr_unwind_cache structure.
400 Some devices lack the sbiw instruction, so on those replace this:
406 A typical AVR function prologue with a frame pointer might look like this:
407 push rXX ; saved regs
413 sbiw r28,<LOCALS_SIZE>
414 in __tmp_reg__,__SREG__
417 out __SREG__,__tmp_reg__
420 A typical AVR function prologue without a frame pointer might look like
422 push rXX ; saved regs
425 A main function prologue looks like this:
426 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
427 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
431 A signal handler prologue looks like this:
434 in __tmp_reg__, __SREG__
437 push rXX ; save registers r18:r27, r30:r31
439 push r28 ; save frame pointer
443 sbiw r28, <LOCALS_SIZE>
447 A interrupt handler prologue looks like this:
451 in __tmp_reg__, __SREG__
454 push rXX ; save registers r18:r27, r30:r31
456 push r28 ; save frame pointer
460 sbiw r28, <LOCALS_SIZE>
466 A `-mcall-prologues' prologue looks like this (Note that the megas use a
467 jmp instead of a rjmp, thus the prologue is one word larger since jmp is a
468 32 bit insn and rjmp is a 16 bit insn):
469 ldi r26,lo8(<LOCALS_SIZE>)
470 ldi r27,hi8(<LOCALS_SIZE>)
471 ldi r30,pm_lo8(.L_foo_body)
472 ldi r31,pm_hi8(.L_foo_body)
473 rjmp __prologue_saves__+RRR
476 /* Not really part of a prologue, but still need to scan for it, is when a
477 function prologue moves values passed via registers as arguments to new
478 registers. In this case, all local variables live in registers, so there
479 may be some register saves. This is what it looks like:
483 There could be multiple movw's. If the target doesn't have a movw insn, it
484 will use two mov insns. This could be done after any of the above prologue
488 avr_scan_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc_beg
, CORE_ADDR pc_end
,
489 struct avr_unwind_cache
*info
)
491 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
495 struct bound_minimal_symbol msymbol
;
496 unsigned char prologue
[AVR_MAX_PROLOGUE_SIZE
];
500 len
= pc_end
- pc_beg
;
501 if (len
> AVR_MAX_PROLOGUE_SIZE
)
502 len
= AVR_MAX_PROLOGUE_SIZE
;
504 /* FIXME: TRoth/2003-06-11: This could be made more efficient by only
505 reading in the bytes of the prologue. The problem is that the figuring
506 out where the end of the prologue is is a bit difficult. The old code
507 tried to do that, but failed quite often. */
508 read_memory (pc_beg
, prologue
, len
);
510 /* Scanning main()'s prologue
511 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
512 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
519 static const unsigned char img
[] = {
520 0xde, 0xbf, /* out __SP_H__,r29 */
521 0xcd, 0xbf /* out __SP_L__,r28 */
524 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
525 /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
526 if ((insn
& 0xf0f0) == 0xe0c0)
528 locals
= (insn
& 0xf) | ((insn
& 0x0f00) >> 4);
529 insn
= extract_unsigned_integer (&prologue
[vpc
+ 2], 2, byte_order
);
530 /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
531 if ((insn
& 0xf0f0) == 0xe0d0)
533 locals
|= ((insn
& 0xf) | ((insn
& 0x0f00) >> 4)) << 8;
534 if (vpc
+ 4 + sizeof (img
) < len
535 && memcmp (prologue
+ vpc
+ 4, img
, sizeof (img
)) == 0)
537 info
->prologue_type
= AVR_PROLOGUE_MAIN
;
545 /* Scanning `-mcall-prologues' prologue
546 Classic prologue is 10 bytes, mega prologue is a 12 bytes long */
548 while (1) /* Using a while to avoid many goto's */
555 /* At least the fifth instruction must have been executed to
556 modify frame shape. */
560 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
561 /* ldi r26,<LOCALS_SIZE> */
562 if ((insn
& 0xf0f0) != 0xe0a0)
564 loc_size
= (insn
& 0xf) | ((insn
& 0x0f00) >> 4);
567 insn
= extract_unsigned_integer (&prologue
[vpc
+ 2], 2, byte_order
);
568 /* ldi r27,<LOCALS_SIZE> / 256 */
569 if ((insn
& 0xf0f0) != 0xe0b0)
571 loc_size
|= ((insn
& 0xf) | ((insn
& 0x0f00) >> 4)) << 8;
574 insn
= extract_unsigned_integer (&prologue
[vpc
+ 4], 2, byte_order
);
575 /* ldi r30,pm_lo8(.L_foo_body) */
576 if ((insn
& 0xf0f0) != 0xe0e0)
578 body_addr
= (insn
& 0xf) | ((insn
& 0x0f00) >> 4);
581 insn
= extract_unsigned_integer (&prologue
[vpc
+ 6], 2, byte_order
);
582 /* ldi r31,pm_hi8(.L_foo_body) */
583 if ((insn
& 0xf0f0) != 0xe0f0)
585 body_addr
|= ((insn
& 0xf) | ((insn
& 0x0f00) >> 4)) << 8;
588 msymbol
= lookup_minimal_symbol ("__prologue_saves__", NULL
, NULL
);
592 insn
= extract_unsigned_integer (&prologue
[vpc
+ 8], 2, byte_order
);
593 /* rjmp __prologue_saves__+RRR */
594 if ((insn
& 0xf000) == 0xc000)
596 /* Extract PC relative offset from RJMP */
597 i
= (insn
& 0xfff) | (insn
& 0x800 ? (-1 ^ 0xfff) : 0);
598 /* Convert offset to byte addressable mode */
600 /* Destination address */
603 if (body_addr
!= (pc_beg
+ 10)/2)
608 else if ((insn
& 0xfe0e) == 0x940c)
610 /* Extract absolute PC address from JMP */
611 i
= (((insn
& 0x1) | ((insn
& 0x1f0) >> 3) << 16)
612 | (extract_unsigned_integer (&prologue
[vpc
+ 10], 2, byte_order
)
614 /* Convert address to byte addressable mode */
617 if (body_addr
!= (pc_beg
+ 12)/2)
625 /* Resolve offset (in words) from __prologue_saves__ symbol.
626 Which is a pushes count in `-mcall-prologues' mode */
627 num_pushes
= (AVR_MAX_PUSHES
628 - (i
- MSYMBOL_VALUE_ADDRESS (msymbol
.minsym
)) / 2);
630 if (num_pushes
> AVR_MAX_PUSHES
)
632 fprintf_unfiltered (gdb_stderr
, _("Num pushes too large: %d\n"),
641 info
->saved_regs
[AVR_FP_REGNUM
+ 1].addr
= num_pushes
;
643 info
->saved_regs
[AVR_FP_REGNUM
].addr
= num_pushes
- 1;
646 for (from
= AVR_LAST_PUSHED_REGNUM
+ 1 - (num_pushes
- 2);
647 from
<= AVR_LAST_PUSHED_REGNUM
; ++from
)
648 info
->saved_regs
[from
].addr
= ++i
;
650 info
->size
= loc_size
+ num_pushes
;
651 info
->prologue_type
= AVR_PROLOGUE_CALL
;
653 return pc_beg
+ pc_offset
;
656 /* Scan for the beginning of the prologue for an interrupt or signal
657 function. Note that we have to set the prologue type here since the
658 third stage of the prologue may not be present (e.g. no saved registered
659 or changing of the SP register). */
663 static const unsigned char img
[] = {
664 0x78, 0x94, /* sei */
665 0x1f, 0x92, /* push r1 */
666 0x0f, 0x92, /* push r0 */
667 0x0f, 0xb6, /* in r0,0x3f SREG */
668 0x0f, 0x92, /* push r0 */
669 0x11, 0x24 /* clr r1 */
671 if (len
>= sizeof (img
)
672 && memcmp (prologue
, img
, sizeof (img
)) == 0)
674 info
->prologue_type
= AVR_PROLOGUE_INTR
;
676 info
->saved_regs
[AVR_SREG_REGNUM
].addr
= 3;
677 info
->saved_regs
[0].addr
= 2;
678 info
->saved_regs
[1].addr
= 1;
681 else if (len
>= sizeof (img
) - 2
682 && memcmp (img
+ 2, prologue
, sizeof (img
) - 2) == 0)
684 info
->prologue_type
= AVR_PROLOGUE_SIG
;
685 vpc
+= sizeof (img
) - 2;
686 info
->saved_regs
[AVR_SREG_REGNUM
].addr
= 3;
687 info
->saved_regs
[0].addr
= 2;
688 info
->saved_regs
[1].addr
= 1;
693 /* First stage of the prologue scanning.
694 Scan pushes (saved registers) */
696 for (; vpc
< len
; vpc
+= 2)
698 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
699 if ((insn
& 0xfe0f) == 0x920f) /* push rXX */
701 /* Bits 4-9 contain a mask for registers R0-R32. */
702 int regno
= (insn
& 0x1f0) >> 4;
704 info
->saved_regs
[regno
].addr
= info
->size
;
711 gdb_assert (vpc
< AVR_MAX_PROLOGUE_SIZE
);
713 /* Handle static small stack allocation using rcall or push. */
715 while (scan_stage
== 1 && vpc
< len
)
717 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
718 if (insn
== 0xd000) /* rcall .+0 */
720 info
->size
+= gdbarch_tdep (gdbarch
)->call_length
;
723 else if (insn
== 0x920f) /* push r0 */
732 /* Second stage of the prologue scanning.
737 if (scan_stage
== 1 && vpc
< len
)
739 static const unsigned char img
[] = {
740 0xcd, 0xb7, /* in r28,__SP_L__ */
741 0xde, 0xb7 /* in r29,__SP_H__ */
744 if (vpc
+ sizeof (img
) < len
745 && memcmp (prologue
+ vpc
, img
, sizeof (img
)) == 0)
752 /* Third stage of the prologue scanning. (Really two stages).
754 sbiw r28,XX or subi r28,lo8(XX)
756 in __tmp_reg__,__SREG__
759 out __SREG__,__tmp_reg__
762 if (scan_stage
== 2 && vpc
< len
)
765 static const unsigned char img
[] = {
766 0x0f, 0xb6, /* in r0,0x3f */
767 0xf8, 0x94, /* cli */
768 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
769 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */
770 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
772 static const unsigned char img_sig
[] = {
773 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
774 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
776 static const unsigned char img_int
[] = {
777 0xf8, 0x94, /* cli */
778 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
779 0x78, 0x94, /* sei */
780 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
783 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
784 if ((insn
& 0xff30) == 0x9720) /* sbiw r28,XXX */
786 locals_size
= (insn
& 0xf) | ((insn
& 0xc0) >> 2);
789 else if ((insn
& 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
791 locals_size
= (insn
& 0xf) | ((insn
& 0xf00) >> 4);
793 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
795 locals_size
+= ((insn
& 0xf) | ((insn
& 0xf00) >> 4)) << 8;
800 /* Scan the last part of the prologue. May not be present for interrupt
801 or signal handler functions, which is why we set the prologue type
802 when we saw the beginning of the prologue previously. */
804 if (vpc
+ sizeof (img_sig
) < len
805 && memcmp (prologue
+ vpc
, img_sig
, sizeof (img_sig
)) == 0)
807 vpc
+= sizeof (img_sig
);
809 else if (vpc
+ sizeof (img_int
) < len
810 && memcmp (prologue
+ vpc
, img_int
, sizeof (img_int
)) == 0)
812 vpc
+= sizeof (img_int
);
814 if (vpc
+ sizeof (img
) < len
815 && memcmp (prologue
+ vpc
, img
, sizeof (img
)) == 0)
817 info
->prologue_type
= AVR_PROLOGUE_NORMAL
;
821 info
->size
+= locals_size
;
826 /* If we got this far, we could not scan the prologue, so just return the pc
827 of the frame plus an adjustment for argument move insns. */
829 for (; vpc
< len
; vpc
+= 2)
831 insn
= extract_unsigned_integer (&prologue
[vpc
], 2, byte_order
);
832 if ((insn
& 0xff00) == 0x0100) /* movw rXX, rYY */
834 else if ((insn
& 0xfc00) == 0x2c00) /* mov rXX, rYY */
844 avr_skip_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
846 CORE_ADDR func_addr
, func_end
;
847 CORE_ADDR post_prologue_pc
;
849 /* See what the symbol table says */
851 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
854 post_prologue_pc
= skip_prologue_using_sal (gdbarch
, func_addr
);
855 if (post_prologue_pc
!= 0)
856 return max (pc
, post_prologue_pc
);
859 CORE_ADDR prologue_end
= pc
;
860 struct avr_unwind_cache info
= {0};
861 struct trad_frame_saved_reg saved_regs
[AVR_NUM_REGS
];
863 info
.saved_regs
= saved_regs
;
865 /* Need to run the prologue scanner to figure out if the function has a
866 prologue and possibly skip over moving arguments passed via registers
867 to other registers. */
869 prologue_end
= avr_scan_prologue (gdbarch
, func_addr
, func_end
, &info
);
871 if (info
.prologue_type
!= AVR_PROLOGUE_NONE
)
875 /* Either we didn't find the start of this function (nothing we can do),
876 or there's no line info, or the line after the prologue is after
877 the end of the function (there probably isn't a prologue). */
882 /* Not all avr devices support the BREAK insn. Those that don't should treat
883 it as a NOP. Thus, it should be ok. Since the avr is currently a remote
884 only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
886 static const unsigned char *
887 avr_breakpoint_from_pc (struct gdbarch
*gdbarch
,
888 CORE_ADDR
*pcptr
, int *lenptr
)
890 static const unsigned char avr_break_insn
[] = { 0x98, 0x95 };
891 *lenptr
= sizeof (avr_break_insn
);
892 return avr_break_insn
;
895 /* Determine, for architecture GDBARCH, how a return value of TYPE
896 should be returned. If it is supposed to be returned in registers,
897 and READBUF is non-zero, read the appropriate value from REGCACHE,
898 and copy it into READBUF. If WRITEBUF is non-zero, write the value
899 from WRITEBUF into REGCACHE. */
901 static enum return_value_convention
902 avr_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
903 struct type
*valtype
, struct regcache
*regcache
,
904 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
907 /* Single byte are returned in r24.
908 Otherwise, the MSB of the return value is always in r25, calculate which
909 register holds the LSB. */
912 if ((TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
913 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
914 || TYPE_CODE (valtype
) == TYPE_CODE_ARRAY
)
915 && TYPE_LENGTH (valtype
) > 8)
916 return RETURN_VALUE_STRUCT_CONVENTION
;
918 if (TYPE_LENGTH (valtype
) <= 2)
920 else if (TYPE_LENGTH (valtype
) <= 4)
922 else if (TYPE_LENGTH (valtype
) <= 8)
925 gdb_assert_not_reached ("unexpected type length");
927 if (writebuf
!= NULL
)
929 for (i
= 0; i
< TYPE_LENGTH (valtype
); i
++)
930 regcache_cooked_write (regcache
, lsb_reg
+ i
, writebuf
+ i
);
935 for (i
= 0; i
< TYPE_LENGTH (valtype
); i
++)
936 regcache_cooked_read (regcache
, lsb_reg
+ i
, readbuf
+ i
);
939 return RETURN_VALUE_REGISTER_CONVENTION
;
943 /* Put here the code to store, into fi->saved_regs, the addresses of
944 the saved registers of frame described by FRAME_INFO. This
945 includes special registers such as pc and fp saved in special ways
946 in the stack frame. sp is even more special: the address we return
947 for it IS the sp for the next frame. */
949 static struct avr_unwind_cache
*
950 avr_frame_unwind_cache (struct frame_info
*this_frame
,
951 void **this_prologue_cache
)
953 CORE_ADDR start_pc
, current_pc
;
956 struct avr_unwind_cache
*info
;
957 struct gdbarch
*gdbarch
;
958 struct gdbarch_tdep
*tdep
;
961 if (*this_prologue_cache
)
962 return *this_prologue_cache
;
964 info
= FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache
);
965 *this_prologue_cache
= info
;
966 info
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
969 info
->prologue_type
= AVR_PROLOGUE_NONE
;
971 start_pc
= get_frame_func (this_frame
);
972 current_pc
= get_frame_pc (this_frame
);
973 if ((start_pc
> 0) && (start_pc
<= current_pc
))
974 avr_scan_prologue (get_frame_arch (this_frame
),
975 start_pc
, current_pc
, info
);
977 if ((info
->prologue_type
!= AVR_PROLOGUE_NONE
)
978 && (info
->prologue_type
!= AVR_PROLOGUE_MAIN
))
980 ULONGEST high_base
; /* High byte of FP */
982 /* The SP was moved to the FP. This indicates that a new frame
983 was created. Get THIS frame's FP value by unwinding it from
985 this_base
= get_frame_register_unsigned (this_frame
, AVR_FP_REGNUM
);
986 high_base
= get_frame_register_unsigned (this_frame
, AVR_FP_REGNUM
+ 1);
987 this_base
+= (high_base
<< 8);
989 /* The FP points at the last saved register. Adjust the FP back
990 to before the first saved register giving the SP. */
991 prev_sp
= this_base
+ info
->size
;
995 /* Assume that the FP is this frame's SP but with that pushed
996 stack space added back. */
997 this_base
= get_frame_register_unsigned (this_frame
, AVR_SP_REGNUM
);
998 prev_sp
= this_base
+ info
->size
;
1001 /* Add 1 here to adjust for the post-decrement nature of the push
1003 info
->prev_sp
= avr_make_saddr (prev_sp
+ 1);
1004 info
->base
= avr_make_saddr (this_base
);
1006 gdbarch
= get_frame_arch (this_frame
);
1008 /* Adjust all the saved registers so that they contain addresses and not
1010 for (i
= 0; i
< gdbarch_num_regs (gdbarch
) - 1; i
++)
1011 if (info
->saved_regs
[i
].addr
> 0)
1012 info
->saved_regs
[i
].addr
= info
->prev_sp
- info
->saved_regs
[i
].addr
;
1014 /* Except for the main and startup code, the return PC is always saved on
1015 the stack and is at the base of the frame. */
1017 if (info
->prologue_type
!= AVR_PROLOGUE_MAIN
)
1018 info
->saved_regs
[AVR_PC_REGNUM
].addr
= info
->prev_sp
;
1020 /* The previous frame's SP needed to be computed. Save the computed
1022 tdep
= gdbarch_tdep (gdbarch
);
1023 trad_frame_set_value (info
->saved_regs
, AVR_SP_REGNUM
,
1024 info
->prev_sp
- 1 + tdep
->call_length
);
1030 avr_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1034 pc
= frame_unwind_register_unsigned (next_frame
, AVR_PC_REGNUM
);
1036 return avr_make_iaddr (pc
);
1040 avr_unwind_sp (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1044 sp
= frame_unwind_register_unsigned (next_frame
, AVR_SP_REGNUM
);
1046 return avr_make_saddr (sp
);
1049 /* Given a GDB frame, determine the address of the calling function's
1050 frame. This will be used to create a new GDB frame struct. */
1053 avr_frame_this_id (struct frame_info
*this_frame
,
1054 void **this_prologue_cache
,
1055 struct frame_id
*this_id
)
1057 struct avr_unwind_cache
*info
1058 = avr_frame_unwind_cache (this_frame
, this_prologue_cache
);
1063 /* The FUNC is easy. */
1064 func
= get_frame_func (this_frame
);
1066 /* Hopefully the prologue analysis either correctly determined the
1067 frame's base (which is the SP from the previous frame), or set
1068 that base to "NULL". */
1069 base
= info
->prev_sp
;
1073 id
= frame_id_build (base
, func
);
1077 static struct value
*
1078 avr_frame_prev_register (struct frame_info
*this_frame
,
1079 void **this_prologue_cache
, int regnum
)
1081 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1082 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
1083 struct avr_unwind_cache
*info
1084 = avr_frame_unwind_cache (this_frame
, this_prologue_cache
);
1086 if (regnum
== AVR_PC_REGNUM
|| regnum
== AVR_PSEUDO_PC_REGNUM
)
1088 if (trad_frame_addr_p (info
->saved_regs
, AVR_PC_REGNUM
))
1090 /* Reading the return PC from the PC register is slightly
1091 abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes,
1092 but in reality, only two bytes (3 in upcoming mega256) are
1093 stored on the stack.
1095 Also, note that the value on the stack is an addr to a word
1096 not a byte, so we will need to multiply it by two at some
1099 And to confuse matters even more, the return address stored
1100 on the stack is in big endian byte order, even though most
1101 everything else about the avr is little endian. Ick! */
1105 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1106 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1108 read_memory (info
->saved_regs
[AVR_PC_REGNUM
].addr
,
1109 buf
, tdep
->call_length
);
1111 /* Extract the PC read from memory as a big-endian. */
1113 for (i
= 0; i
< tdep
->call_length
; i
++)
1114 pc
= (pc
<< 8) | buf
[i
];
1116 if (regnum
== AVR_PC_REGNUM
)
1119 return frame_unwind_got_constant (this_frame
, regnum
, pc
);
1122 return frame_unwind_got_optimized (this_frame
, regnum
);
1125 return trad_frame_get_prev_register (this_frame
, info
->saved_regs
, regnum
);
1128 static const struct frame_unwind avr_frame_unwind
= {
1130 default_frame_unwind_stop_reason
,
1132 avr_frame_prev_register
,
1134 default_frame_sniffer
1138 avr_frame_base_address (struct frame_info
*this_frame
, void **this_cache
)
1140 struct avr_unwind_cache
*info
1141 = avr_frame_unwind_cache (this_frame
, this_cache
);
1146 static const struct frame_base avr_frame_base
= {
1148 avr_frame_base_address
,
1149 avr_frame_base_address
,
1150 avr_frame_base_address
1153 /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy
1154 frame. The frame ID's base needs to match the TOS value saved by
1155 save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */
1157 static struct frame_id
1158 avr_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*this_frame
)
1162 base
= get_frame_register_unsigned (this_frame
, AVR_SP_REGNUM
);
1163 return frame_id_build (avr_make_saddr (base
), get_frame_pc (this_frame
));
1166 /* When arguments must be pushed onto the stack, they go on in reverse
1167 order. The below implements a FILO (stack) to do this. */
1172 struct stack_item
*prev
;
1176 static struct stack_item
*
1177 push_stack_item (struct stack_item
*prev
, const bfd_byte
*contents
, int len
)
1179 struct stack_item
*si
;
1180 si
= xmalloc (sizeof (struct stack_item
));
1181 si
->data
= xmalloc (len
);
1184 memcpy (si
->data
, contents
, len
);
1188 static struct stack_item
*pop_stack_item (struct stack_item
*si
);
1189 static struct stack_item
*
1190 pop_stack_item (struct stack_item
*si
)
1192 struct stack_item
*dead
= si
;
1199 /* Setup the function arguments for calling a function in the inferior.
1201 On the AVR architecture, there are 18 registers (R25 to R8) which are
1202 dedicated for passing function arguments. Up to the first 18 arguments
1203 (depending on size) may go into these registers. The rest go on the stack.
1205 All arguments are aligned to start in even-numbered registers (odd-sized
1206 arguments, including char, have one free register above them). For example,
1207 an int in arg1 and a char in arg2 would be passed as such:
1212 Arguments that are larger than 2 bytes will be split between two or more
1213 registers as available, but will NOT be split between a register and the
1214 stack. Arguments that go onto the stack are pushed last arg first (this is
1215 similar to the d10v). */
1217 /* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be
1220 An exceptional case exists for struct arguments (and possibly other
1221 aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but
1222 not a multiple of WORDSIZE bytes. In this case the argument is never split
1223 between the registers and the stack, but instead is copied in its entirety
1224 onto the stack, AND also copied into as many registers as there is room
1225 for. In other words, space in registers permitting, two copies of the same
1226 argument are passed in. As far as I can tell, only the one on the stack is
1227 used, although that may be a function of the level of compiler
1228 optimization. I suspect this is a compiler bug. Arguments of these odd
1229 sizes are left-justified within the word (as opposed to arguments smaller
1230 than WORDSIZE bytes, which are right-justified).
1232 If the function is to return an aggregate type such as a struct, the caller
1233 must allocate space into which the callee will copy the return value. In
1234 this case, a pointer to the return value location is passed into the callee
1235 in register R0, which displaces one of the other arguments passed in via
1236 registers R0 to R2. */
1239 avr_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
1240 struct regcache
*regcache
, CORE_ADDR bp_addr
,
1241 int nargs
, struct value
**args
, CORE_ADDR sp
,
1242 int struct_return
, CORE_ADDR struct_addr
)
1244 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
1247 int call_length
= gdbarch_tdep (gdbarch
)->call_length
;
1248 CORE_ADDR return_pc
= avr_convert_iaddr_to_raw (bp_addr
);
1249 int regnum
= AVR_ARGN_REGNUM
;
1250 struct stack_item
*si
= NULL
;
1254 regcache_cooked_write_unsigned
1255 (regcache
, regnum
--, (struct_addr
>> 8) & 0xff);
1256 regcache_cooked_write_unsigned
1257 (regcache
, regnum
--, struct_addr
& 0xff);
1258 /* SP being post decremented, we need to reserve one byte so that the
1259 return address won't overwrite the result (or vice-versa). */
1260 if (sp
== struct_addr
)
1264 for (i
= 0; i
< nargs
; i
++)
1268 struct value
*arg
= args
[i
];
1269 struct type
*type
= check_typedef (value_type (arg
));
1270 const bfd_byte
*contents
= value_contents (arg
);
1271 int len
= TYPE_LENGTH (type
);
1273 /* Calculate the potential last register needed. */
1274 last_regnum
= regnum
- (len
+ (len
& 1));
1276 /* If there are registers available, use them. Once we start putting
1277 stuff on the stack, all subsequent args go on stack. */
1278 if ((si
== NULL
) && (last_regnum
>= 8))
1282 /* Skip a register for odd length args. */
1286 val
= extract_unsigned_integer (contents
, len
, byte_order
);
1287 for (j
= 0; j
< len
; j
++)
1288 regcache_cooked_write_unsigned
1289 (regcache
, regnum
--, val
>> (8 * (len
- j
- 1)));
1291 /* No registers available, push the args onto the stack. */
1294 /* From here on, we don't care about regnum. */
1295 si
= push_stack_item (si
, contents
, len
);
1299 /* Push args onto the stack. */
1303 /* Add 1 to sp here to account for post decr nature of pushes. */
1304 write_memory (sp
+ 1, si
->data
, si
->len
);
1305 si
= pop_stack_item (si
);
1308 /* Set the return address. For the avr, the return address is the BP_ADDR.
1309 Need to push the return address onto the stack noting that it needs to be
1310 in big-endian order on the stack. */
1311 for (i
= 1; i
<= call_length
; i
++)
1313 buf
[call_length
- i
] = return_pc
& 0xff;
1318 /* Use 'sp + 1' since pushes are post decr ops. */
1319 write_memory (sp
+ 1, buf
, call_length
);
1321 /* Finally, update the SP register. */
1322 regcache_cooked_write_unsigned (regcache
, AVR_SP_REGNUM
,
1323 avr_convert_saddr_to_raw (sp
));
1325 /* Return SP value for the dummy frame, where the return address hasn't been
1327 return sp
+ call_length
;
1330 /* Unfortunately dwarf2 register for SP is 32. */
1333 avr_dwarf_reg_to_regnum (struct gdbarch
*gdbarch
, int reg
)
1335 if (reg
>= 0 && reg
< 32)
1338 return AVR_SP_REGNUM
;
1340 warning (_("Unmapped DWARF Register #%d encountered."), reg
);
1345 /* Initialize the gdbarch structure for the AVR's. */
1347 static struct gdbarch
*
1348 avr_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
1350 struct gdbarch
*gdbarch
;
1351 struct gdbarch_tdep
*tdep
;
1352 struct gdbarch_list
*best_arch
;
1355 /* Avr-6 call instructions save 3 bytes. */
1356 switch (info
.bfd_arch_info
->mach
)
1371 /* If there is already a candidate, use it. */
1372 for (best_arch
= gdbarch_list_lookup_by_info (arches
, &info
);
1374 best_arch
= gdbarch_list_lookup_by_info (best_arch
->next
, &info
))
1376 if (gdbarch_tdep (best_arch
->gdbarch
)->call_length
== call_length
)
1377 return best_arch
->gdbarch
;
1380 /* None found, create a new architecture from the information provided. */
1381 tdep
= XNEW (struct gdbarch_tdep
);
1382 gdbarch
= gdbarch_alloc (&info
, tdep
);
1384 tdep
->call_length
= call_length
;
1386 /* Create a type for PC. We can't use builtin types here, as they may not
1388 tdep
->void_type
= arch_type (gdbarch
, TYPE_CODE_VOID
, 1, "void");
1389 tdep
->func_void_type
= make_function_type (tdep
->void_type
, NULL
);
1390 tdep
->pc_type
= arch_type (gdbarch
, TYPE_CODE_PTR
, 4, NULL
);
1391 TYPE_TARGET_TYPE (tdep
->pc_type
) = tdep
->func_void_type
;
1392 TYPE_UNSIGNED (tdep
->pc_type
) = 1;
1394 set_gdbarch_short_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1395 set_gdbarch_int_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1396 set_gdbarch_long_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1397 set_gdbarch_long_long_bit (gdbarch
, 8 * TARGET_CHAR_BIT
);
1398 set_gdbarch_ptr_bit (gdbarch
, 2 * TARGET_CHAR_BIT
);
1399 set_gdbarch_addr_bit (gdbarch
, 32);
1401 set_gdbarch_float_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1402 set_gdbarch_double_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1403 set_gdbarch_long_double_bit (gdbarch
, 4 * TARGET_CHAR_BIT
);
1405 set_gdbarch_float_format (gdbarch
, floatformats_ieee_single
);
1406 set_gdbarch_double_format (gdbarch
, floatformats_ieee_single
);
1407 set_gdbarch_long_double_format (gdbarch
, floatformats_ieee_single
);
1409 set_gdbarch_read_pc (gdbarch
, avr_read_pc
);
1410 set_gdbarch_write_pc (gdbarch
, avr_write_pc
);
1412 set_gdbarch_num_regs (gdbarch
, AVR_NUM_REGS
);
1414 set_gdbarch_sp_regnum (gdbarch
, AVR_SP_REGNUM
);
1415 set_gdbarch_pc_regnum (gdbarch
, AVR_PC_REGNUM
);
1417 set_gdbarch_register_name (gdbarch
, avr_register_name
);
1418 set_gdbarch_register_type (gdbarch
, avr_register_type
);
1420 set_gdbarch_num_pseudo_regs (gdbarch
, AVR_NUM_PSEUDO_REGS
);
1421 set_gdbarch_pseudo_register_read (gdbarch
, avr_pseudo_register_read
);
1422 set_gdbarch_pseudo_register_write (gdbarch
, avr_pseudo_register_write
);
1424 set_gdbarch_return_value (gdbarch
, avr_return_value
);
1425 set_gdbarch_print_insn (gdbarch
, print_insn_avr
);
1427 set_gdbarch_push_dummy_call (gdbarch
, avr_push_dummy_call
);
1429 set_gdbarch_dwarf2_reg_to_regnum (gdbarch
, avr_dwarf_reg_to_regnum
);
1431 set_gdbarch_address_to_pointer (gdbarch
, avr_address_to_pointer
);
1432 set_gdbarch_pointer_to_address (gdbarch
, avr_pointer_to_address
);
1433 set_gdbarch_integer_to_address (gdbarch
, avr_integer_to_address
);
1435 set_gdbarch_skip_prologue (gdbarch
, avr_skip_prologue
);
1436 set_gdbarch_inner_than (gdbarch
, core_addr_lessthan
);
1438 set_gdbarch_breakpoint_from_pc (gdbarch
, avr_breakpoint_from_pc
);
1440 frame_unwind_append_unwinder (gdbarch
, &avr_frame_unwind
);
1441 frame_base_set_default (gdbarch
, &avr_frame_base
);
1443 set_gdbarch_dummy_id (gdbarch
, avr_dummy_id
);
1445 set_gdbarch_unwind_pc (gdbarch
, avr_unwind_pc
);
1446 set_gdbarch_unwind_sp (gdbarch
, avr_unwind_sp
);
1451 /* Send a query request to the avr remote target asking for values of the io
1452 registers. If args parameter is not NULL, then the user has requested info
1453 on a specific io register [This still needs implemented and is ignored for
1454 now]. The query string should be one of these forms:
1456 "Ravr.io_reg" -> reply is "NN" number of io registers
1458 "Ravr.io_reg:addr,len" where addr is first register and len is number of
1459 registers to be read. The reply should be "<NAME>,VV;" for each io register
1460 where, <NAME> is a string, and VV is the hex value of the register.
1462 All io registers are 8-bit. */
1465 avr_io_reg_read_command (char *args
, int from_tty
)
1472 unsigned int nreg
= 0;
1476 /* Find out how many io registers the target has. */
1477 bufsiz
= target_read_alloc (¤t_target
, TARGET_OBJECT_AVR
,
1478 "avr.io_reg", &buf
);
1479 bufstr
= (const char *) buf
;
1483 fprintf_unfiltered (gdb_stderr
,
1484 _("ERR: info io_registers NOT supported "
1485 "by current target\n"));
1489 if (sscanf (bufstr
, "%x", &nreg
) != 1)
1491 fprintf_unfiltered (gdb_stderr
,
1492 _("Error fetching number of io registers\n"));
1499 reinitialize_more_filter ();
1501 printf_unfiltered (_("Target has %u io registers:\n\n"), nreg
);
1503 /* only fetch up to 8 registers at a time to keep the buffer small */
1506 for (i
= 0; i
< nreg
; i
+= step
)
1508 /* how many registers this round? */
1511 j
= nreg
- i
; /* last block is less than 8 registers */
1513 snprintf (query
, sizeof (query
) - 1, "avr.io_reg:%x,%x", i
, j
);
1514 bufsiz
= target_read_alloc (¤t_target
, TARGET_OBJECT_AVR
,
1517 p
= (const char *) buf
;
1518 for (k
= i
; k
< (i
+ j
); k
++)
1520 if (sscanf (p
, "%[^,],%x;", query
, &val
) == 2)
1522 printf_filtered ("[%02x] %-15s : %02x\n", k
, query
, val
);
1523 while ((*p
!= ';') && (*p
!= '\0'))
1525 p
++; /* skip over ';' */
1535 extern initialize_file_ftype _initialize_avr_tdep
; /* -Wmissing-prototypes */
1538 _initialize_avr_tdep (void)
1540 register_gdbarch_init (bfd_arch_avr
, avr_gdbarch_init
);
1542 /* Add a new command to allow the user to query the avr remote target for
1543 the values of the io space registers in a saner way than just using
1546 /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
1547 io_registers' to signify it is not available on other platforms. */
1549 add_cmd ("io_registers", class_info
, avr_io_reg_read_command
,
1550 _("query remote avr target for io space register values"),