1 /* Target-dependent code for Atmel AVR, for GDB.
3 Copyright (C) 1996-2016 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 struct trad_frame_saved_reg *saved_regs;
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;
199 /* Type for a function returning void. */
200 struct type *func_void_type;
201 /* Type for a pointer to a function. Used for the type of PC. */
202 struct type *pc_type;
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;
233 if (reg_nr == AVR_PSEUDO_PC_REGNUM)
234 return gdbarch_tdep (gdbarch)->pc_type;
235 if (reg_nr == AVR_SP_REGNUM)
236 return builtin_type (gdbarch)->builtin_data_ptr;
237 return builtin_type (gdbarch)->builtin_uint8;
240 /* Instruction address checks and convertions. */
243 avr_make_iaddr (CORE_ADDR x)
245 return ((x) | AVR_IMEM_START);
248 /* FIXME: TRoth: Really need to use a larger mask for instructions. Some
249 devices are already up to 128KBytes of flash space.
251 TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
254 avr_convert_iaddr_to_raw (CORE_ADDR x)
256 return ((x) & 0xffffffff);
259 /* SRAM address checks and convertions. */
262 avr_make_saddr (CORE_ADDR x)
264 /* Return 0 for NULL. */
268 return ((x) | AVR_SMEM_START);
272 avr_convert_saddr_to_raw (CORE_ADDR x)
274 return ((x) & 0xffffffff);
277 /* EEPROM address checks and convertions. I don't know if these will ever
278 actually be used, but I've added them just the same. TRoth */
280 /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
281 programs in the mega128. */
283 /* static CORE_ADDR */
284 /* avr_make_eaddr (CORE_ADDR x) */
286 /* return ((x) | AVR_EMEM_START); */
290 /* avr_eaddr_p (CORE_ADDR x) */
292 /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */
295 /* static CORE_ADDR */
296 /* avr_convert_eaddr_to_raw (CORE_ADDR x) */
298 /* return ((x) & 0xffffffff); */
301 /* Convert from address to pointer and vice-versa. */
304 avr_address_to_pointer (struct gdbarch *gdbarch,
305 struct type *type, gdb_byte *buf, CORE_ADDR addr)
307 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
309 /* Is it a data address in flash? */
310 if (AVR_TYPE_ADDRESS_CLASS_FLASH (type))
312 /* A data pointer in flash is byte addressed. */
313 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
314 avr_convert_iaddr_to_raw (addr));
316 /* Is it a code address? */
317 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
318 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
320 /* A code pointer is word (16 bits) addressed. We shift the address down
321 by 1 bit to convert it to a pointer. */
322 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
323 avr_convert_iaddr_to_raw (addr >> 1));
327 /* Strip off any upper segment bits. */
328 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
329 avr_convert_saddr_to_raw (addr));
334 avr_pointer_to_address (struct gdbarch *gdbarch,
335 struct type *type, const gdb_byte *buf)
337 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
339 = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
341 /* Is it a data address in flash? */
342 if (AVR_TYPE_ADDRESS_CLASS_FLASH (type))
344 /* A data pointer in flash is already byte addressed. */
345 return avr_make_iaddr (addr);
347 /* Is it a code address? */
348 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
349 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD
350 || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
352 /* A code pointer is word (16 bits) addressed so we shift it up
353 by 1 bit to convert it to an address. */
354 return avr_make_iaddr (addr << 1);
357 return avr_make_saddr (addr);
361 avr_integer_to_address (struct gdbarch *gdbarch,
362 struct type *type, const gdb_byte *buf)
364 ULONGEST addr = unpack_long (type, buf);
366 return avr_make_saddr (addr);
370 avr_read_pc (struct regcache *regcache)
373 regcache_cooked_read_unsigned (regcache, AVR_PC_REGNUM, &pc);
374 return avr_make_iaddr (pc);
378 avr_write_pc (struct regcache *regcache, CORE_ADDR val)
380 regcache_cooked_write_unsigned (regcache, AVR_PC_REGNUM,
381 avr_convert_iaddr_to_raw (val));
384 static enum register_status
385 avr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
386 int regnum, gdb_byte *buf)
389 enum register_status status;
393 case AVR_PSEUDO_PC_REGNUM:
394 status = regcache_raw_read_unsigned (regcache, AVR_PC_REGNUM, &val);
395 if (status != REG_VALID)
398 store_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch), val);
401 internal_error (__FILE__, __LINE__, _("invalid regnum"));
406 avr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
407 int regnum, const gdb_byte *buf)
413 case AVR_PSEUDO_PC_REGNUM:
414 val = extract_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch));
416 regcache_raw_write_unsigned (regcache, AVR_PC_REGNUM, val);
419 internal_error (__FILE__, __LINE__, _("invalid regnum"));
423 /* Function: avr_scan_prologue
425 This function decodes an AVR function prologue to determine:
426 1) the size of the stack frame
427 2) which registers are saved on it
428 3) the offsets of saved regs
429 This information is stored in the avr_unwind_cache structure.
431 Some devices lack the sbiw instruction, so on those replace this:
437 A typical AVR function prologue with a frame pointer might look like this:
438 push rXX ; saved regs
444 sbiw r28,<LOCALS_SIZE>
445 in __tmp_reg__,__SREG__
448 out __SREG__,__tmp_reg__
451 A typical AVR function prologue without a frame pointer might look like
453 push rXX ; saved regs
456 A main function prologue looks like this:
457 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
458 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
462 A signal handler prologue looks like this:
465 in __tmp_reg__, __SREG__
468 push rXX ; save registers r18:r27, r30:r31
470 push r28 ; save frame pointer
474 sbiw r28, <LOCALS_SIZE>
478 A interrupt handler prologue looks like this:
482 in __tmp_reg__, __SREG__
485 push rXX ; save registers r18:r27, r30:r31
487 push r28 ; save frame pointer
491 sbiw r28, <LOCALS_SIZE>
497 A `-mcall-prologues' prologue looks like this (Note that the megas use a
498 jmp instead of a rjmp, thus the prologue is one word larger since jmp is a
499 32 bit insn and rjmp is a 16 bit insn):
500 ldi r26,lo8(<LOCALS_SIZE>)
501 ldi r27,hi8(<LOCALS_SIZE>)
502 ldi r30,pm_lo8(.L_foo_body)
503 ldi r31,pm_hi8(.L_foo_body)
504 rjmp __prologue_saves__+RRR
507 /* Not really part of a prologue, but still need to scan for it, is when a
508 function prologue moves values passed via registers as arguments to new
509 registers. In this case, all local variables live in registers, so there
510 may be some register saves. This is what it looks like:
514 There could be multiple movw's. If the target doesn't have a movw insn, it
515 will use two mov insns. This could be done after any of the above prologue
519 avr_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR pc_beg, CORE_ADDR pc_end,
520 struct avr_unwind_cache *info)
522 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
526 struct bound_minimal_symbol msymbol;
527 unsigned char prologue[AVR_MAX_PROLOGUE_SIZE];
531 len = pc_end - pc_beg;
532 if (len > AVR_MAX_PROLOGUE_SIZE)
533 len = AVR_MAX_PROLOGUE_SIZE;
535 /* FIXME: TRoth/2003-06-11: This could be made more efficient by only
536 reading in the bytes of the prologue. The problem is that the figuring
537 out where the end of the prologue is is a bit difficult. The old code
538 tried to do that, but failed quite often. */
539 read_memory (pc_beg, prologue, len);
541 /* Scanning main()'s prologue
542 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
543 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
550 static const unsigned char img[] = {
551 0xde, 0xbf, /* out __SP_H__,r29 */
552 0xcd, 0xbf /* out __SP_L__,r28 */
555 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
556 /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
557 if ((insn & 0xf0f0) == 0xe0c0)
559 locals = (insn & 0xf) | ((insn & 0x0f00) >> 4);
560 insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
561 /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
562 if ((insn & 0xf0f0) == 0xe0d0)
564 locals |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
565 if (vpc + 4 + sizeof (img) < len
566 && memcmp (prologue + vpc + 4, img, sizeof (img)) == 0)
568 info->prologue_type = AVR_PROLOGUE_MAIN;
576 /* Scanning `-mcall-prologues' prologue
577 Classic prologue is 10 bytes, mega prologue is a 12 bytes long */
579 while (1) /* Using a while to avoid many goto's */
586 /* At least the fifth instruction must have been executed to
587 modify frame shape. */
591 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
592 /* ldi r26,<LOCALS_SIZE> */
593 if ((insn & 0xf0f0) != 0xe0a0)
595 loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4);
598 insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
599 /* ldi r27,<LOCALS_SIZE> / 256 */
600 if ((insn & 0xf0f0) != 0xe0b0)
602 loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
605 insn = extract_unsigned_integer (&prologue[vpc + 4], 2, byte_order);
606 /* ldi r30,pm_lo8(.L_foo_body) */
607 if ((insn & 0xf0f0) != 0xe0e0)
609 body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4);
612 insn = extract_unsigned_integer (&prologue[vpc + 6], 2, byte_order);
613 /* ldi r31,pm_hi8(.L_foo_body) */
614 if ((insn & 0xf0f0) != 0xe0f0)
616 body_addr |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
619 msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL);
623 insn = extract_unsigned_integer (&prologue[vpc + 8], 2, byte_order);
624 /* rjmp __prologue_saves__+RRR */
625 if ((insn & 0xf000) == 0xc000)
627 /* Extract PC relative offset from RJMP */
628 i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0);
629 /* Convert offset to byte addressable mode */
631 /* Destination address */
634 if (body_addr != (pc_beg + 10)/2)
639 else if ((insn & 0xfe0e) == 0x940c)
641 /* Extract absolute PC address from JMP */
642 i = (((insn & 0x1) | ((insn & 0x1f0) >> 3) << 16)
643 | (extract_unsigned_integer (&prologue[vpc + 10], 2, byte_order)
645 /* Convert address to byte addressable mode */
648 if (body_addr != (pc_beg + 12)/2)
656 /* Resolve offset (in words) from __prologue_saves__ symbol.
657 Which is a pushes count in `-mcall-prologues' mode */
658 num_pushes = AVR_MAX_PUSHES - (i - BMSYMBOL_VALUE_ADDRESS (msymbol)) / 2;
660 if (num_pushes > AVR_MAX_PUSHES)
662 fprintf_unfiltered (gdb_stderr, _("Num pushes too large: %d\n"),
671 info->saved_regs[AVR_FP_REGNUM + 1].addr = num_pushes;
673 info->saved_regs[AVR_FP_REGNUM].addr = num_pushes - 1;
676 for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2);
677 from <= AVR_LAST_PUSHED_REGNUM; ++from)
678 info->saved_regs [from].addr = ++i;
680 info->size = loc_size + num_pushes;
681 info->prologue_type = AVR_PROLOGUE_CALL;
683 return pc_beg + pc_offset;
686 /* Scan for the beginning of the prologue for an interrupt or signal
687 function. Note that we have to set the prologue type here since the
688 third stage of the prologue may not be present (e.g. no saved registered
689 or changing of the SP register). */
693 static const unsigned char img[] = {
694 0x78, 0x94, /* sei */
695 0x1f, 0x92, /* push r1 */
696 0x0f, 0x92, /* push r0 */
697 0x0f, 0xb6, /* in r0,0x3f SREG */
698 0x0f, 0x92, /* push r0 */
699 0x11, 0x24 /* clr r1 */
701 if (len >= sizeof (img)
702 && memcmp (prologue, img, sizeof (img)) == 0)
704 info->prologue_type = AVR_PROLOGUE_INTR;
706 info->saved_regs[AVR_SREG_REGNUM].addr = 3;
707 info->saved_regs[0].addr = 2;
708 info->saved_regs[1].addr = 1;
711 else if (len >= sizeof (img) - 2
712 && memcmp (img + 2, prologue, sizeof (img) - 2) == 0)
714 info->prologue_type = AVR_PROLOGUE_SIG;
715 vpc += sizeof (img) - 2;
716 info->saved_regs[AVR_SREG_REGNUM].addr = 3;
717 info->saved_regs[0].addr = 2;
718 info->saved_regs[1].addr = 1;
723 /* First stage of the prologue scanning.
724 Scan pushes (saved registers) */
726 for (; vpc < len; vpc += 2)
728 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
729 if ((insn & 0xfe0f) == 0x920f) /* push rXX */
731 /* Bits 4-9 contain a mask for registers R0-R32. */
732 int regno = (insn & 0x1f0) >> 4;
734 info->saved_regs[regno].addr = info->size;
741 gdb_assert (vpc < AVR_MAX_PROLOGUE_SIZE);
743 /* Handle static small stack allocation using rcall or push. */
745 while (scan_stage == 1 && vpc < len)
747 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
748 if (insn == 0xd000) /* rcall .+0 */
750 info->size += gdbarch_tdep (gdbarch)->call_length;
753 else if (insn == 0x920f || insn == 0x921f) /* push r0 or push r1 */
762 /* Second stage of the prologue scanning.
767 if (scan_stage == 1 && vpc < len)
769 static const unsigned char img[] = {
770 0xcd, 0xb7, /* in r28,__SP_L__ */
771 0xde, 0xb7 /* in r29,__SP_H__ */
774 if (vpc + sizeof (img) < len
775 && memcmp (prologue + vpc, img, sizeof (img)) == 0)
782 /* Third stage of the prologue scanning. (Really two stages).
784 sbiw r28,XX or subi r28,lo8(XX)
786 in __tmp_reg__,__SREG__
789 out __SREG__,__tmp_reg__
792 if (scan_stage == 2 && vpc < len)
795 static const unsigned char img[] = {
796 0x0f, 0xb6, /* in r0,0x3f */
797 0xf8, 0x94, /* cli */
798 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
799 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */
800 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
802 static const unsigned char img_sig[] = {
803 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
804 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
806 static const unsigned char img_int[] = {
807 0xf8, 0x94, /* cli */
808 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
809 0x78, 0x94, /* sei */
810 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
813 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
814 if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */
816 locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
819 else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
821 locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4);
823 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
825 locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4)) << 8;
830 /* Scan the last part of the prologue. May not be present for interrupt
831 or signal handler functions, which is why we set the prologue type
832 when we saw the beginning of the prologue previously. */
834 if (vpc + sizeof (img_sig) < len
835 && memcmp (prologue + vpc, img_sig, sizeof (img_sig)) == 0)
837 vpc += sizeof (img_sig);
839 else if (vpc + sizeof (img_int) < len
840 && memcmp (prologue + vpc, img_int, sizeof (img_int)) == 0)
842 vpc += sizeof (img_int);
844 if (vpc + sizeof (img) < len
845 && memcmp (prologue + vpc, img, sizeof (img)) == 0)
847 info->prologue_type = AVR_PROLOGUE_NORMAL;
851 info->size += locals_size;
856 /* If we got this far, we could not scan the prologue, so just return the pc
857 of the frame plus an adjustment for argument move insns. */
859 for (; vpc < len; vpc += 2)
861 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
862 if ((insn & 0xff00) == 0x0100) /* movw rXX, rYY */
864 else if ((insn & 0xfc00) == 0x2c00) /* mov rXX, rYY */
874 avr_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
876 CORE_ADDR func_addr, func_end;
877 CORE_ADDR post_prologue_pc;
879 /* See what the symbol table says */
881 if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
884 post_prologue_pc = skip_prologue_using_sal (gdbarch, func_addr);
885 if (post_prologue_pc != 0)
886 return std::max (pc, post_prologue_pc);
889 CORE_ADDR prologue_end = pc;
890 struct avr_unwind_cache info = {0};
891 struct trad_frame_saved_reg saved_regs[AVR_NUM_REGS];
893 info.saved_regs = saved_regs;
895 /* Need to run the prologue scanner to figure out if the function has a
896 prologue and possibly skip over moving arguments passed via registers
897 to other registers. */
899 prologue_end = avr_scan_prologue (gdbarch, func_addr, func_end, &info);
901 if (info.prologue_type != AVR_PROLOGUE_NONE)
905 /* Either we didn't find the start of this function (nothing we can do),
906 or there's no line info, or the line after the prologue is after
907 the end of the function (there probably isn't a prologue). */
912 /* Not all avr devices support the BREAK insn. Those that don't should treat
913 it as a NOP. Thus, it should be ok. Since the avr is currently a remote
914 only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
916 static const unsigned char avr_break_insn [] = { 0x98, 0x95 };
918 GDBARCH_BREAKPOINT_MANIPULATION (avr, avr_break_insn)
920 /* Determine, for architecture GDBARCH, how a return value of TYPE
921 should be returned. If it is supposed to be returned in registers,
922 and READBUF is non-zero, read the appropriate value from REGCACHE,
923 and copy it into READBUF. If WRITEBUF is non-zero, write the value
924 from WRITEBUF into REGCACHE. */
926 static enum return_value_convention
927 avr_return_value (struct gdbarch *gdbarch, struct value *function,
928 struct type *valtype, struct regcache *regcache,
929 gdb_byte *readbuf, const gdb_byte *writebuf)
932 /* Single byte are returned in r24.
933 Otherwise, the MSB of the return value is always in r25, calculate which
934 register holds the LSB. */
937 if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
938 || TYPE_CODE (valtype) == TYPE_CODE_UNION
939 || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
940 && TYPE_LENGTH (valtype) > 8)
941 return RETURN_VALUE_STRUCT_CONVENTION;
943 if (TYPE_LENGTH (valtype) <= 2)
945 else if (TYPE_LENGTH (valtype) <= 4)
947 else if (TYPE_LENGTH (valtype) <= 8)
950 gdb_assert_not_reached ("unexpected type length");
952 if (writebuf != NULL)
954 for (i = 0; i < TYPE_LENGTH (valtype); i++)
955 regcache_cooked_write (regcache, lsb_reg + i, writebuf + i);
960 for (i = 0; i < TYPE_LENGTH (valtype); i++)
961 regcache_cooked_read (regcache, lsb_reg + i, readbuf + i);
964 return RETURN_VALUE_REGISTER_CONVENTION;
968 /* Put here the code to store, into fi->saved_regs, the addresses of
969 the saved registers of frame described by FRAME_INFO. This
970 includes special registers such as pc and fp saved in special ways
971 in the stack frame. sp is even more special: the address we return
972 for it IS the sp for the next frame. */
974 static struct avr_unwind_cache *
975 avr_frame_unwind_cache (struct frame_info *this_frame,
976 void **this_prologue_cache)
978 CORE_ADDR start_pc, current_pc;
981 struct avr_unwind_cache *info;
982 struct gdbarch *gdbarch;
983 struct gdbarch_tdep *tdep;
986 if (*this_prologue_cache)
987 return (struct avr_unwind_cache *) *this_prologue_cache;
989 info = FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache);
990 *this_prologue_cache = info;
991 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
994 info->prologue_type = AVR_PROLOGUE_NONE;
996 start_pc = get_frame_func (this_frame);
997 current_pc = get_frame_pc (this_frame);
998 if ((start_pc > 0) && (start_pc <= current_pc))
999 avr_scan_prologue (get_frame_arch (this_frame),
1000 start_pc, current_pc, info);
1002 if ((info->prologue_type != AVR_PROLOGUE_NONE)
1003 && (info->prologue_type != AVR_PROLOGUE_MAIN))
1005 ULONGEST high_base; /* High byte of FP */
1007 /* The SP was moved to the FP. This indicates that a new frame
1008 was created. Get THIS frame's FP value by unwinding it from
1010 this_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM);
1011 high_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM + 1);
1012 this_base += (high_base << 8);
1014 /* The FP points at the last saved register. Adjust the FP back
1015 to before the first saved register giving the SP. */
1016 prev_sp = this_base + info->size;
1020 /* Assume that the FP is this frame's SP but with that pushed
1021 stack space added back. */
1022 this_base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
1023 prev_sp = this_base + info->size;
1026 /* Add 1 here to adjust for the post-decrement nature of the push
1028 info->prev_sp = avr_make_saddr (prev_sp + 1);
1029 info->base = avr_make_saddr (this_base);
1031 gdbarch = get_frame_arch (this_frame);
1033 /* Adjust all the saved registers so that they contain addresses and not
1035 for (i = 0; i < gdbarch_num_regs (gdbarch) - 1; i++)
1036 if (info->saved_regs[i].addr > 0)
1037 info->saved_regs[i].addr = info->prev_sp - info->saved_regs[i].addr;
1039 /* Except for the main and startup code, the return PC is always saved on
1040 the stack and is at the base of the frame. */
1042 if (info->prologue_type != AVR_PROLOGUE_MAIN)
1043 info->saved_regs[AVR_PC_REGNUM].addr = info->prev_sp;
1045 /* The previous frame's SP needed to be computed. Save the computed
1047 tdep = gdbarch_tdep (gdbarch);
1048 trad_frame_set_value (info->saved_regs, AVR_SP_REGNUM,
1049 info->prev_sp - 1 + tdep->call_length);
1055 avr_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
1059 pc = frame_unwind_register_unsigned (next_frame, AVR_PC_REGNUM);
1061 return avr_make_iaddr (pc);
1065 avr_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
1069 sp = frame_unwind_register_unsigned (next_frame, AVR_SP_REGNUM);
1071 return avr_make_saddr (sp);
1074 /* Given a GDB frame, determine the address of the calling function's
1075 frame. This will be used to create a new GDB frame struct. */
1078 avr_frame_this_id (struct frame_info *this_frame,
1079 void **this_prologue_cache,
1080 struct frame_id *this_id)
1082 struct avr_unwind_cache *info
1083 = avr_frame_unwind_cache (this_frame, this_prologue_cache);
1088 /* The FUNC is easy. */
1089 func = get_frame_func (this_frame);
1091 /* Hopefully the prologue analysis either correctly determined the
1092 frame's base (which is the SP from the previous frame), or set
1093 that base to "NULL". */
1094 base = info->prev_sp;
1098 id = frame_id_build (base, func);
1102 static struct value *
1103 avr_frame_prev_register (struct frame_info *this_frame,
1104 void **this_prologue_cache, int regnum)
1106 struct avr_unwind_cache *info
1107 = avr_frame_unwind_cache (this_frame, this_prologue_cache);
1109 if (regnum == AVR_PC_REGNUM || regnum == AVR_PSEUDO_PC_REGNUM)
1111 if (trad_frame_addr_p (info->saved_regs, AVR_PC_REGNUM))
1113 /* Reading the return PC from the PC register is slightly
1114 abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes,
1115 but in reality, only two bytes (3 in upcoming mega256) are
1116 stored on the stack.
1118 Also, note that the value on the stack is an addr to a word
1119 not a byte, so we will need to multiply it by two at some
1122 And to confuse matters even more, the return address stored
1123 on the stack is in big endian byte order, even though most
1124 everything else about the avr is little endian. Ick! */
1128 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1129 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1131 read_memory (info->saved_regs[AVR_PC_REGNUM].addr,
1132 buf, tdep->call_length);
1134 /* Extract the PC read from memory as a big-endian. */
1136 for (i = 0; i < tdep->call_length; i++)
1137 pc = (pc << 8) | buf[i];
1139 if (regnum == AVR_PC_REGNUM)
1142 return frame_unwind_got_constant (this_frame, regnum, pc);
1145 return frame_unwind_got_optimized (this_frame, regnum);
1148 return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
1151 static const struct frame_unwind avr_frame_unwind = {
1153 default_frame_unwind_stop_reason,
1155 avr_frame_prev_register,
1157 default_frame_sniffer
1161 avr_frame_base_address (struct frame_info *this_frame, void **this_cache)
1163 struct avr_unwind_cache *info
1164 = avr_frame_unwind_cache (this_frame, this_cache);
1169 static const struct frame_base avr_frame_base = {
1171 avr_frame_base_address,
1172 avr_frame_base_address,
1173 avr_frame_base_address
1176 /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy
1177 frame. The frame ID's base needs to match the TOS value saved by
1178 save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */
1180 static struct frame_id
1181 avr_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
1185 base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
1186 return frame_id_build (avr_make_saddr (base), get_frame_pc (this_frame));
1189 /* When arguments must be pushed onto the stack, they go on in reverse
1190 order. The below implements a FILO (stack) to do this. */
1195 struct stack_item *prev;
1199 static struct stack_item *
1200 push_stack_item (struct stack_item *prev, const bfd_byte *contents, int len)
1202 struct stack_item *si;
1203 si = XNEW (struct stack_item);
1204 si->data = (gdb_byte *) xmalloc (len);
1207 memcpy (si->data, contents, len);
1211 static struct stack_item *pop_stack_item (struct stack_item *si);
1212 static struct stack_item *
1213 pop_stack_item (struct stack_item *si)
1215 struct stack_item *dead = si;
1222 /* Setup the function arguments for calling a function in the inferior.
1224 On the AVR architecture, there are 18 registers (R25 to R8) which are
1225 dedicated for passing function arguments. Up to the first 18 arguments
1226 (depending on size) may go into these registers. The rest go on the stack.
1228 All arguments are aligned to start in even-numbered registers (odd-sized
1229 arguments, including char, have one free register above them). For example,
1230 an int in arg1 and a char in arg2 would be passed as such:
1235 Arguments that are larger than 2 bytes will be split between two or more
1236 registers as available, but will NOT be split between a register and the
1237 stack. Arguments that go onto the stack are pushed last arg first (this is
1238 similar to the d10v). */
1240 /* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be
1243 An exceptional case exists for struct arguments (and possibly other
1244 aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but
1245 not a multiple of WORDSIZE bytes. In this case the argument is never split
1246 between the registers and the stack, but instead is copied in its entirety
1247 onto the stack, AND also copied into as many registers as there is room
1248 for. In other words, space in registers permitting, two copies of the same
1249 argument are passed in. As far as I can tell, only the one on the stack is
1250 used, although that may be a function of the level of compiler
1251 optimization. I suspect this is a compiler bug. Arguments of these odd
1252 sizes are left-justified within the word (as opposed to arguments smaller
1253 than WORDSIZE bytes, which are right-justified).
1255 If the function is to return an aggregate type such as a struct, the caller
1256 must allocate space into which the callee will copy the return value. In
1257 this case, a pointer to the return value location is passed into the callee
1258 in register R0, which displaces one of the other arguments passed in via
1259 registers R0 to R2. */
1262 avr_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
1263 struct regcache *regcache, CORE_ADDR bp_addr,
1264 int nargs, struct value **args, CORE_ADDR sp,
1265 int struct_return, CORE_ADDR struct_addr)
1269 int call_length = gdbarch_tdep (gdbarch)->call_length;
1270 CORE_ADDR return_pc = avr_convert_iaddr_to_raw (bp_addr);
1271 int regnum = AVR_ARGN_REGNUM;
1272 struct stack_item *si = NULL;
1276 regcache_cooked_write_unsigned
1277 (regcache, regnum--, (struct_addr >> 8) & 0xff);
1278 regcache_cooked_write_unsigned
1279 (regcache, regnum--, struct_addr & 0xff);
1280 /* SP being post decremented, we need to reserve one byte so that the
1281 return address won't overwrite the result (or vice-versa). */
1282 if (sp == struct_addr)
1286 for (i = 0; i < nargs; i++)
1290 struct value *arg = args[i];
1291 struct type *type = check_typedef (value_type (arg));
1292 const bfd_byte *contents = value_contents (arg);
1293 int len = TYPE_LENGTH (type);
1295 /* Calculate the potential last register needed.
1296 E.g. For length 2, registers regnum and regnum-1 (say 25 and 24)
1297 shall be used. So, last needed register will be regnum-1(24). */
1298 last_regnum = regnum - (len + (len & 1)) + 1;
1300 /* If there are registers available, use them. Once we start putting
1301 stuff on the stack, all subsequent args go on stack. */
1302 if ((si == NULL) && (last_regnum >= AVR_LAST_ARG_REGNUM))
1304 /* Skip a register for odd length args. */
1308 /* Write MSB of argument into register and subsequent bytes in
1309 decreasing register numbers. */
1310 for (j = 0; j < len; j++)
1311 regcache_cooked_write_unsigned
1312 (regcache, regnum--, contents[len - j - 1]);
1314 /* No registers available, push the args onto the stack. */
1317 /* From here on, we don't care about regnum. */
1318 si = push_stack_item (si, contents, len);
1322 /* Push args onto the stack. */
1326 /* Add 1 to sp here to account for post decr nature of pushes. */
1327 write_memory (sp + 1, si->data, si->len);
1328 si = pop_stack_item (si);
1331 /* Set the return address. For the avr, the return address is the BP_ADDR.
1332 Need to push the return address onto the stack noting that it needs to be
1333 in big-endian order on the stack. */
1334 for (i = 1; i <= call_length; i++)
1336 buf[call_length - i] = return_pc & 0xff;
1341 /* Use 'sp + 1' since pushes are post decr ops. */
1342 write_memory (sp + 1, buf, call_length);
1344 /* Finally, update the SP register. */
1345 regcache_cooked_write_unsigned (regcache, AVR_SP_REGNUM,
1346 avr_convert_saddr_to_raw (sp));
1348 /* Return SP value for the dummy frame, where the return address hasn't been
1350 return sp + call_length;
1353 /* Unfortunately dwarf2 register for SP is 32. */
1356 avr_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
1358 if (reg >= 0 && reg < 32)
1361 return AVR_SP_REGNUM;
1365 /* Implementation of `address_class_type_flags' gdbarch method.
1367 This method maps DW_AT_address_class attributes to a
1368 type_instance_flag_value. */
1371 avr_address_class_type_flags (int byte_size, int dwarf2_addr_class)
1373 /* The value 1 of the DW_AT_address_class attribute corresponds to the
1374 __flash qualifier. Note that this attribute is only valid with
1375 pointer types and therefore the flag is set to the pointer type and
1376 not its target type. */
1377 if (dwarf2_addr_class == 1 && byte_size == 2)
1378 return AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH;
1382 /* Implementation of `address_class_type_flags_to_name' gdbarch method.
1384 Convert a type_instance_flag_value to an address space qualifier. */
1387 avr_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
1389 if (type_flags & AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH)
1395 /* Implementation of `address_class_name_to_type_flags' gdbarch method.
1397 Convert an address space qualifier to a type_instance_flag_value. */
1400 avr_address_class_name_to_type_flags (struct gdbarch *gdbarch,
1402 int *type_flags_ptr)
1404 if (strcmp (name, "flash") == 0)
1406 *type_flags_ptr = AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH;
1413 /* Initialize the gdbarch structure for the AVR's. */
1415 static struct gdbarch *
1416 avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1418 struct gdbarch *gdbarch;
1419 struct gdbarch_tdep *tdep;
1420 struct gdbarch_list *best_arch;
1423 /* Avr-6 call instructions save 3 bytes. */
1424 switch (info.bfd_arch_info->mach)
1427 case bfd_mach_avrxmega1:
1429 case bfd_mach_avrxmega2:
1431 case bfd_mach_avrxmega3:
1433 case bfd_mach_avrxmega4:
1435 case bfd_mach_avrxmega5:
1440 case bfd_mach_avrxmega6:
1441 case bfd_mach_avrxmega7:
1446 /* If there is already a candidate, use it. */
1447 for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
1449 best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
1451 if (gdbarch_tdep (best_arch->gdbarch)->call_length == call_length)
1452 return best_arch->gdbarch;
1455 /* None found, create a new architecture from the information provided. */
1456 tdep = XNEW (struct gdbarch_tdep);
1457 gdbarch = gdbarch_alloc (&info, tdep);
1459 tdep->call_length = call_length;
1461 /* Create a type for PC. We can't use builtin types here, as they may not
1463 tdep->void_type = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void");
1464 tdep->func_void_type = make_function_type (tdep->void_type, NULL);
1465 tdep->pc_type = arch_pointer_type (gdbarch, 4 * TARGET_CHAR_BIT, NULL,
1466 tdep->func_void_type);
1468 set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1469 set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1470 set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1471 set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
1472 set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1473 set_gdbarch_addr_bit (gdbarch, 32);
1475 set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1476 set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1477 set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1479 set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
1480 set_gdbarch_double_format (gdbarch, floatformats_ieee_single);
1481 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_single);
1483 set_gdbarch_read_pc (gdbarch, avr_read_pc);
1484 set_gdbarch_write_pc (gdbarch, avr_write_pc);
1486 set_gdbarch_num_regs (gdbarch, AVR_NUM_REGS);
1488 set_gdbarch_sp_regnum (gdbarch, AVR_SP_REGNUM);
1489 set_gdbarch_pc_regnum (gdbarch, AVR_PC_REGNUM);
1491 set_gdbarch_register_name (gdbarch, avr_register_name);
1492 set_gdbarch_register_type (gdbarch, avr_register_type);
1494 set_gdbarch_num_pseudo_regs (gdbarch, AVR_NUM_PSEUDO_REGS);
1495 set_gdbarch_pseudo_register_read (gdbarch, avr_pseudo_register_read);
1496 set_gdbarch_pseudo_register_write (gdbarch, avr_pseudo_register_write);
1498 set_gdbarch_return_value (gdbarch, avr_return_value);
1499 set_gdbarch_print_insn (gdbarch, print_insn_avr);
1501 set_gdbarch_push_dummy_call (gdbarch, avr_push_dummy_call);
1503 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, avr_dwarf_reg_to_regnum);
1505 set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer);
1506 set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address);
1507 set_gdbarch_integer_to_address (gdbarch, avr_integer_to_address);
1509 set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue);
1510 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1512 SET_GDBARCH_BREAKPOINT_MANIPULATION (avr);
1514 frame_unwind_append_unwinder (gdbarch, &avr_frame_unwind);
1515 frame_base_set_default (gdbarch, &avr_frame_base);
1517 set_gdbarch_dummy_id (gdbarch, avr_dummy_id);
1519 set_gdbarch_unwind_pc (gdbarch, avr_unwind_pc);
1520 set_gdbarch_unwind_sp (gdbarch, avr_unwind_sp);
1522 set_gdbarch_address_class_type_flags (gdbarch, avr_address_class_type_flags);
1523 set_gdbarch_address_class_name_to_type_flags
1524 (gdbarch, avr_address_class_name_to_type_flags);
1525 set_gdbarch_address_class_type_flags_to_name
1526 (gdbarch, avr_address_class_type_flags_to_name);
1531 /* Send a query request to the avr remote target asking for values of the io
1532 registers. If args parameter is not NULL, then the user has requested info
1533 on a specific io register [This still needs implemented and is ignored for
1534 now]. The query string should be one of these forms:
1536 "Ravr.io_reg" -> reply is "NN" number of io registers
1538 "Ravr.io_reg:addr,len" where addr is first register and len is number of
1539 registers to be read. The reply should be "<NAME>,VV;" for each io register
1540 where, <NAME> is a string, and VV is the hex value of the register.
1542 All io registers are 8-bit. */
1545 avr_io_reg_read_command (char *args, int from_tty)
1552 unsigned int nreg = 0;
1556 /* Find out how many io registers the target has. */
1557 bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
1558 "avr.io_reg", &buf);
1559 bufstr = (const char *) buf;
1563 fprintf_unfiltered (gdb_stderr,
1564 _("ERR: info io_registers NOT supported "
1565 "by current target\n"));
1569 if (sscanf (bufstr, "%x", &nreg) != 1)
1571 fprintf_unfiltered (gdb_stderr,
1572 _("Error fetching number of io registers\n"));
1579 reinitialize_more_filter ();
1581 printf_unfiltered (_("Target has %u io registers:\n\n"), nreg);
1583 /* only fetch up to 8 registers at a time to keep the buffer small */
1586 for (i = 0; i < nreg; i += step)
1588 /* how many registers this round? */
1591 j = nreg - i; /* last block is less than 8 registers */
1593 snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j);
1594 bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
1597 p = (const char *) buf;
1598 for (k = i; k < (i + j); k++)
1600 if (sscanf (p, "%[^,],%x;", query, &val) == 2)
1602 printf_filtered ("[%02x] %-15s : %02x\n", k, query, val);
1603 while ((*p != ';') && (*p != '\0'))
1605 p++; /* skip over ';' */
1615 extern initialize_file_ftype _initialize_avr_tdep; /* -Wmissing-prototypes */
1618 _initialize_avr_tdep (void)
1620 register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init);
1622 /* Add a new command to allow the user to query the avr remote target for
1623 the values of the io space registers in a saner way than just using
1626 /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
1627 io_registers' to signify it is not available on other platforms. */
1629 add_info ("io_registers", avr_io_reg_read_command,
1630 _("query remote avr target for io space register values"));