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"
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 */
116 AVR_RET1_REGNUM = 24, /* Single byte return value */
117 AVR_RETN_REGNUM = 25, /* Multi byte return value */
119 /* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8
120 bits? Do these have to match the bfd vma values? It sure would make
121 things easier in the future if they didn't need to match.
123 Note: I chose these values so as to be consistent with bfd vma
126 TRoth/2002-04-08: There is already a conflict with very large programs
127 in the mega128. The mega128 has 128K instruction bytes (64K words),
128 thus the Most Significant Bit is 0x10000 which gets masked off my
131 The problem manifests itself when trying to set a breakpoint in a
132 function which resides in the upper half of the instruction space and
133 thus requires a 17-bit address.
135 For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK
136 from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
137 but could be for some remote targets by just adding the correct offset
138 to the address and letting the remote target handle the low-level
139 details of actually accessing the eeprom. */
141 AVR_IMEM_START = 0x00000000, /* INSN memory */
142 AVR_SMEM_START = 0x00800000, /* SRAM memory */
144 /* No eeprom mask defined */
145 AVR_MEM_MASK = 0x00f00000, /* mask to determine memory space */
147 AVR_EMEM_START = 0x00810000, /* EEPROM memory */
148 AVR_MEM_MASK = 0x00ff0000, /* mask to determine memory space */
154 NORMAL and CALL are the typical types (the -mcall-prologues gcc option
155 causes the generation of the CALL type prologues). */
158 AVR_PROLOGUE_NONE, /* No prologue */
160 AVR_PROLOGUE_CALL, /* -mcall-prologues */
162 AVR_PROLOGUE_INTR, /* interrupt handler */
163 AVR_PROLOGUE_SIG, /* signal handler */
166 /* Any function with a frame looks like this
167 ....... <-SP POINTS HERE
168 LOCALS1 <-FP POINTS HERE
177 struct avr_unwind_cache
179 /* The previous frame's inner most stack address. Used as this
180 frame ID's stack_addr. */
182 /* The frame's base, optionally used by the high-level debug info. */
186 /* Table indicating the location of each and every register. */
187 struct trad_frame_saved_reg *saved_regs;
192 /* Number of bytes stored to the stack by call instructions.
193 2 bytes for avr1-5 and avrxmega1-5, 3 bytes for avr6 and avrxmega6-7. */
197 struct type *void_type;
198 /* Type for a function returning void. */
199 struct type *func_void_type;
200 /* Type for a pointer to a function. Used for the type of PC. */
201 struct type *pc_type;
204 /* Lookup the name of a register given it's number. */
207 avr_register_name (struct gdbarch *gdbarch, int regnum)
209 static const char * const register_names[] = {
210 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
211 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
212 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
213 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
219 if (regnum >= (sizeof (register_names) / sizeof (*register_names)))
221 return register_names[regnum];
224 /* Return the GDB type object for the "standard" data type
225 of data in register N. */
228 avr_register_type (struct gdbarch *gdbarch, int reg_nr)
230 if (reg_nr == AVR_PC_REGNUM)
231 return builtin_type (gdbarch)->builtin_uint32;
232 if (reg_nr == AVR_PSEUDO_PC_REGNUM)
233 return gdbarch_tdep (gdbarch)->pc_type;
234 if (reg_nr == AVR_SP_REGNUM)
235 return builtin_type (gdbarch)->builtin_data_ptr;
236 return builtin_type (gdbarch)->builtin_uint8;
239 /* Instruction address checks and convertions. */
242 avr_make_iaddr (CORE_ADDR x)
244 return ((x) | AVR_IMEM_START);
247 /* FIXME: TRoth: Really need to use a larger mask for instructions. Some
248 devices are already up to 128KBytes of flash space.
250 TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
253 avr_convert_iaddr_to_raw (CORE_ADDR x)
255 return ((x) & 0xffffffff);
258 /* SRAM address checks and convertions. */
261 avr_make_saddr (CORE_ADDR x)
263 /* Return 0 for NULL. */
267 return ((x) | AVR_SMEM_START);
271 avr_convert_saddr_to_raw (CORE_ADDR x)
273 return ((x) & 0xffffffff);
276 /* EEPROM address checks and convertions. I don't know if these will ever
277 actually be used, but I've added them just the same. TRoth */
279 /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
280 programs in the mega128. */
282 /* static CORE_ADDR */
283 /* avr_make_eaddr (CORE_ADDR x) */
285 /* return ((x) | AVR_EMEM_START); */
289 /* avr_eaddr_p (CORE_ADDR x) */
291 /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */
294 /* static CORE_ADDR */
295 /* avr_convert_eaddr_to_raw (CORE_ADDR x) */
297 /* return ((x) & 0xffffffff); */
300 /* Convert from address to pointer and vice-versa. */
303 avr_address_to_pointer (struct gdbarch *gdbarch,
304 struct type *type, gdb_byte *buf, CORE_ADDR addr)
306 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
308 /* Is it a data address in flash? */
309 if (AVR_TYPE_ADDRESS_CLASS_FLASH (type))
311 /* A data address in flash is always byte addressed. */
312 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
313 avr_convert_iaddr_to_raw (addr));
315 /* Is it a code address? */
316 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
317 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
319 /* A code address, either a function pointer or the program counter, is
320 word (16 bits) addressed. */
321 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
322 avr_convert_iaddr_to_raw (addr >> 1));
326 /* Strip off any upper segment bits. */
327 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
328 avr_convert_saddr_to_raw (addr));
333 avr_pointer_to_address (struct gdbarch *gdbarch,
334 struct type *type, const gdb_byte *buf)
336 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
338 = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
340 /* Is it a data address in flash? */
341 if (AVR_TYPE_ADDRESS_CLASS_FLASH (type))
342 return avr_make_iaddr (addr);
343 /* Is it a code address? */
344 else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
345 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD
346 || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
347 return avr_make_iaddr (addr << 1);
349 return avr_make_saddr (addr);
353 avr_integer_to_address (struct gdbarch *gdbarch,
354 struct type *type, const gdb_byte *buf)
356 ULONGEST addr = unpack_long (type, buf);
358 return avr_make_saddr (addr);
362 avr_read_pc (struct regcache *regcache)
365 regcache_cooked_read_unsigned (regcache, AVR_PC_REGNUM, &pc);
366 return avr_make_iaddr (pc);
370 avr_write_pc (struct regcache *regcache, CORE_ADDR val)
372 regcache_cooked_write_unsigned (regcache, AVR_PC_REGNUM,
373 avr_convert_iaddr_to_raw (val));
376 static enum register_status
377 avr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
378 int regnum, gdb_byte *buf)
381 enum register_status status;
385 case AVR_PSEUDO_PC_REGNUM:
386 status = regcache_raw_read_unsigned (regcache, AVR_PC_REGNUM, &val);
387 if (status != REG_VALID)
390 store_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch), val);
393 internal_error (__FILE__, __LINE__, _("invalid regnum"));
398 avr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
399 int regnum, const gdb_byte *buf)
405 case AVR_PSEUDO_PC_REGNUM:
406 val = extract_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch));
408 regcache_raw_write_unsigned (regcache, AVR_PC_REGNUM, val);
411 internal_error (__FILE__, __LINE__, _("invalid regnum"));
415 /* Function: avr_scan_prologue
417 This function decodes an AVR function prologue to determine:
418 1) the size of the stack frame
419 2) which registers are saved on it
420 3) the offsets of saved regs
421 This information is stored in the avr_unwind_cache structure.
423 Some devices lack the sbiw instruction, so on those replace this:
429 A typical AVR function prologue with a frame pointer might look like this:
430 push rXX ; saved regs
436 sbiw r28,<LOCALS_SIZE>
437 in __tmp_reg__,__SREG__
440 out __SREG__,__tmp_reg__
443 A typical AVR function prologue without a frame pointer might look like
445 push rXX ; saved regs
448 A main function prologue looks like this:
449 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
450 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
454 A signal handler prologue looks like this:
457 in __tmp_reg__, __SREG__
460 push rXX ; save registers r18:r27, r30:r31
462 push r28 ; save frame pointer
466 sbiw r28, <LOCALS_SIZE>
470 A interrupt handler prologue looks like this:
474 in __tmp_reg__, __SREG__
477 push rXX ; save registers r18:r27, r30:r31
479 push r28 ; save frame pointer
483 sbiw r28, <LOCALS_SIZE>
489 A `-mcall-prologues' prologue looks like this (Note that the megas use a
490 jmp instead of a rjmp, thus the prologue is one word larger since jmp is a
491 32 bit insn and rjmp is a 16 bit insn):
492 ldi r26,lo8(<LOCALS_SIZE>)
493 ldi r27,hi8(<LOCALS_SIZE>)
494 ldi r30,pm_lo8(.L_foo_body)
495 ldi r31,pm_hi8(.L_foo_body)
496 rjmp __prologue_saves__+RRR
499 /* Not really part of a prologue, but still need to scan for it, is when a
500 function prologue moves values passed via registers as arguments to new
501 registers. In this case, all local variables live in registers, so there
502 may be some register saves. This is what it looks like:
506 There could be multiple movw's. If the target doesn't have a movw insn, it
507 will use two mov insns. This could be done after any of the above prologue
511 avr_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR pc_beg, CORE_ADDR pc_end,
512 struct avr_unwind_cache *info)
514 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
518 struct bound_minimal_symbol msymbol;
519 unsigned char prologue[AVR_MAX_PROLOGUE_SIZE];
523 len = pc_end - pc_beg;
524 if (len > AVR_MAX_PROLOGUE_SIZE)
525 len = AVR_MAX_PROLOGUE_SIZE;
527 /* FIXME: TRoth/2003-06-11: This could be made more efficient by only
528 reading in the bytes of the prologue. The problem is that the figuring
529 out where the end of the prologue is is a bit difficult. The old code
530 tried to do that, but failed quite often. */
531 read_memory (pc_beg, prologue, len);
533 /* Scanning main()'s prologue
534 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
535 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
542 static const unsigned char img[] = {
543 0xde, 0xbf, /* out __SP_H__,r29 */
544 0xcd, 0xbf /* out __SP_L__,r28 */
547 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
548 /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
549 if ((insn & 0xf0f0) == 0xe0c0)
551 locals = (insn & 0xf) | ((insn & 0x0f00) >> 4);
552 insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
553 /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
554 if ((insn & 0xf0f0) == 0xe0d0)
556 locals |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
557 if (vpc + 4 + sizeof (img) < len
558 && memcmp (prologue + vpc + 4, img, sizeof (img)) == 0)
560 info->prologue_type = AVR_PROLOGUE_MAIN;
568 /* Scanning `-mcall-prologues' prologue
569 Classic prologue is 10 bytes, mega prologue is a 12 bytes long */
571 while (1) /* Using a while to avoid many goto's */
578 /* At least the fifth instruction must have been executed to
579 modify frame shape. */
583 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
584 /* ldi r26,<LOCALS_SIZE> */
585 if ((insn & 0xf0f0) != 0xe0a0)
587 loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4);
590 insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
591 /* ldi r27,<LOCALS_SIZE> / 256 */
592 if ((insn & 0xf0f0) != 0xe0b0)
594 loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
597 insn = extract_unsigned_integer (&prologue[vpc + 4], 2, byte_order);
598 /* ldi r30,pm_lo8(.L_foo_body) */
599 if ((insn & 0xf0f0) != 0xe0e0)
601 body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4);
604 insn = extract_unsigned_integer (&prologue[vpc + 6], 2, byte_order);
605 /* ldi r31,pm_hi8(.L_foo_body) */
606 if ((insn & 0xf0f0) != 0xe0f0)
608 body_addr |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
611 msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL);
615 insn = extract_unsigned_integer (&prologue[vpc + 8], 2, byte_order);
616 /* rjmp __prologue_saves__+RRR */
617 if ((insn & 0xf000) == 0xc000)
619 /* Extract PC relative offset from RJMP */
620 i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0);
621 /* Convert offset to byte addressable mode */
623 /* Destination address */
626 if (body_addr != (pc_beg + 10)/2)
631 else if ((insn & 0xfe0e) == 0x940c)
633 /* Extract absolute PC address from JMP */
634 i = (((insn & 0x1) | ((insn & 0x1f0) >> 3) << 16)
635 | (extract_unsigned_integer (&prologue[vpc + 10], 2, byte_order)
637 /* Convert address to byte addressable mode */
640 if (body_addr != (pc_beg + 12)/2)
648 /* Resolve offset (in words) from __prologue_saves__ symbol.
649 Which is a pushes count in `-mcall-prologues' mode */
650 num_pushes = AVR_MAX_PUSHES - (i - BMSYMBOL_VALUE_ADDRESS (msymbol)) / 2;
652 if (num_pushes > AVR_MAX_PUSHES)
654 fprintf_unfiltered (gdb_stderr, _("Num pushes too large: %d\n"),
663 info->saved_regs[AVR_FP_REGNUM + 1].addr = num_pushes;
665 info->saved_regs[AVR_FP_REGNUM].addr = num_pushes - 1;
668 for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2);
669 from <= AVR_LAST_PUSHED_REGNUM; ++from)
670 info->saved_regs [from].addr = ++i;
672 info->size = loc_size + num_pushes;
673 info->prologue_type = AVR_PROLOGUE_CALL;
675 return pc_beg + pc_offset;
678 /* Scan for the beginning of the prologue for an interrupt or signal
679 function. Note that we have to set the prologue type here since the
680 third stage of the prologue may not be present (e.g. no saved registered
681 or changing of the SP register). */
685 static const unsigned char img[] = {
686 0x78, 0x94, /* sei */
687 0x1f, 0x92, /* push r1 */
688 0x0f, 0x92, /* push r0 */
689 0x0f, 0xb6, /* in r0,0x3f SREG */
690 0x0f, 0x92, /* push r0 */
691 0x11, 0x24 /* clr r1 */
693 if (len >= sizeof (img)
694 && memcmp (prologue, img, sizeof (img)) == 0)
696 info->prologue_type = AVR_PROLOGUE_INTR;
698 info->saved_regs[AVR_SREG_REGNUM].addr = 3;
699 info->saved_regs[0].addr = 2;
700 info->saved_regs[1].addr = 1;
703 else if (len >= sizeof (img) - 2
704 && memcmp (img + 2, prologue, sizeof (img) - 2) == 0)
706 info->prologue_type = AVR_PROLOGUE_SIG;
707 vpc += sizeof (img) - 2;
708 info->saved_regs[AVR_SREG_REGNUM].addr = 3;
709 info->saved_regs[0].addr = 2;
710 info->saved_regs[1].addr = 1;
715 /* First stage of the prologue scanning.
716 Scan pushes (saved registers) */
718 for (; vpc < len; vpc += 2)
720 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
721 if ((insn & 0xfe0f) == 0x920f) /* push rXX */
723 /* Bits 4-9 contain a mask for registers R0-R32. */
724 int regno = (insn & 0x1f0) >> 4;
726 info->saved_regs[regno].addr = info->size;
733 gdb_assert (vpc < AVR_MAX_PROLOGUE_SIZE);
735 /* Handle static small stack allocation using rcall or push. */
737 while (scan_stage == 1 && vpc < len)
739 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
740 if (insn == 0xd000) /* rcall .+0 */
742 info->size += gdbarch_tdep (gdbarch)->call_length;
745 else if (insn == 0x920f || insn == 0x921f) /* push r0 or push r1 */
754 /* Second stage of the prologue scanning.
759 if (scan_stage == 1 && vpc < len)
761 static const unsigned char img[] = {
762 0xcd, 0xb7, /* in r28,__SP_L__ */
763 0xde, 0xb7 /* in r29,__SP_H__ */
766 if (vpc + sizeof (img) < len
767 && memcmp (prologue + vpc, img, sizeof (img)) == 0)
774 /* Third stage of the prologue scanning. (Really two stages).
776 sbiw r28,XX or subi r28,lo8(XX)
778 in __tmp_reg__,__SREG__
781 out __SREG__,__tmp_reg__
784 if (scan_stage == 2 && vpc < len)
787 static const unsigned char img[] = {
788 0x0f, 0xb6, /* in r0,0x3f */
789 0xf8, 0x94, /* cli */
790 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
791 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */
792 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
794 static const unsigned char img_sig[] = {
795 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
796 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
798 static const unsigned char img_int[] = {
799 0xf8, 0x94, /* cli */
800 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
801 0x78, 0x94, /* sei */
802 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
805 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
806 if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */
808 locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
811 else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
813 locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4);
815 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
817 locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4)) << 8;
822 /* Scan the last part of the prologue. May not be present for interrupt
823 or signal handler functions, which is why we set the prologue type
824 when we saw the beginning of the prologue previously. */
826 if (vpc + sizeof (img_sig) < len
827 && memcmp (prologue + vpc, img_sig, sizeof (img_sig)) == 0)
829 vpc += sizeof (img_sig);
831 else if (vpc + sizeof (img_int) < len
832 && memcmp (prologue + vpc, img_int, sizeof (img_int)) == 0)
834 vpc += sizeof (img_int);
836 if (vpc + sizeof (img) < len
837 && memcmp (prologue + vpc, img, sizeof (img)) == 0)
839 info->prologue_type = AVR_PROLOGUE_NORMAL;
843 info->size += locals_size;
848 /* If we got this far, we could not scan the prologue, so just return the pc
849 of the frame plus an adjustment for argument move insns. */
851 for (; vpc < len; vpc += 2)
853 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
854 if ((insn & 0xff00) == 0x0100) /* movw rXX, rYY */
856 else if ((insn & 0xfc00) == 0x2c00) /* mov rXX, rYY */
866 avr_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
868 CORE_ADDR func_addr, func_end;
869 CORE_ADDR post_prologue_pc;
871 /* See what the symbol table says */
873 if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
876 post_prologue_pc = skip_prologue_using_sal (gdbarch, func_addr);
877 if (post_prologue_pc != 0)
878 return max (pc, post_prologue_pc);
881 CORE_ADDR prologue_end = pc;
882 struct avr_unwind_cache info = {0};
883 struct trad_frame_saved_reg saved_regs[AVR_NUM_REGS];
885 info.saved_regs = saved_regs;
887 /* Need to run the prologue scanner to figure out if the function has a
888 prologue and possibly skip over moving arguments passed via registers
889 to other registers. */
891 prologue_end = avr_scan_prologue (gdbarch, func_addr, func_end, &info);
893 if (info.prologue_type != AVR_PROLOGUE_NONE)
897 /* Either we didn't find the start of this function (nothing we can do),
898 or there's no line info, or the line after the prologue is after
899 the end of the function (there probably isn't a prologue). */
904 /* Not all avr devices support the BREAK insn. Those that don't should treat
905 it as a NOP. Thus, it should be ok. Since the avr is currently a remote
906 only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
908 static const unsigned char *
909 avr_breakpoint_from_pc (struct gdbarch *gdbarch,
910 CORE_ADDR *pcptr, int *lenptr)
912 static const unsigned char avr_break_insn [] = { 0x98, 0x95 };
913 *lenptr = sizeof (avr_break_insn);
914 return avr_break_insn;
917 /* Determine, for architecture GDBARCH, how a return value of TYPE
918 should be returned. If it is supposed to be returned in registers,
919 and READBUF is non-zero, read the appropriate value from REGCACHE,
920 and copy it into READBUF. If WRITEBUF is non-zero, write the value
921 from WRITEBUF into REGCACHE. */
923 static enum return_value_convention
924 avr_return_value (struct gdbarch *gdbarch, struct value *function,
925 struct type *valtype, struct regcache *regcache,
926 gdb_byte *readbuf, const gdb_byte *writebuf)
929 /* Single byte are returned in r24.
930 Otherwise, the MSB of the return value is always in r25, calculate which
931 register holds the LSB. */
934 if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
935 || TYPE_CODE (valtype) == TYPE_CODE_UNION
936 || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
937 && TYPE_LENGTH (valtype) > 8)
938 return RETURN_VALUE_STRUCT_CONVENTION;
940 if (TYPE_LENGTH (valtype) <= 2)
942 else if (TYPE_LENGTH (valtype) <= 4)
944 else if (TYPE_LENGTH (valtype) <= 8)
947 gdb_assert_not_reached ("unexpected type length");
949 if (writebuf != NULL)
951 for (i = 0; i < TYPE_LENGTH (valtype); i++)
952 regcache_cooked_write (regcache, lsb_reg + i, writebuf + i);
957 for (i = 0; i < TYPE_LENGTH (valtype); i++)
958 regcache_cooked_read (regcache, lsb_reg + i, readbuf + i);
961 return RETURN_VALUE_REGISTER_CONVENTION;
965 /* Put here the code to store, into fi->saved_regs, the addresses of
966 the saved registers of frame described by FRAME_INFO. This
967 includes special registers such as pc and fp saved in special ways
968 in the stack frame. sp is even more special: the address we return
969 for it IS the sp for the next frame. */
971 static struct avr_unwind_cache *
972 avr_frame_unwind_cache (struct frame_info *this_frame,
973 void **this_prologue_cache)
975 CORE_ADDR start_pc, current_pc;
978 struct avr_unwind_cache *info;
979 struct gdbarch *gdbarch;
980 struct gdbarch_tdep *tdep;
983 if (*this_prologue_cache)
984 return *this_prologue_cache;
986 info = FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache);
987 *this_prologue_cache = info;
988 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
991 info->prologue_type = AVR_PROLOGUE_NONE;
993 start_pc = get_frame_func (this_frame);
994 current_pc = get_frame_pc (this_frame);
995 if ((start_pc > 0) && (start_pc <= current_pc))
996 avr_scan_prologue (get_frame_arch (this_frame),
997 start_pc, current_pc, info);
999 if ((info->prologue_type != AVR_PROLOGUE_NONE)
1000 && (info->prologue_type != AVR_PROLOGUE_MAIN))
1002 ULONGEST high_base; /* High byte of FP */
1004 /* The SP was moved to the FP. This indicates that a new frame
1005 was created. Get THIS frame's FP value by unwinding it from
1007 this_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM);
1008 high_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM + 1);
1009 this_base += (high_base << 8);
1011 /* The FP points at the last saved register. Adjust the FP back
1012 to before the first saved register giving the SP. */
1013 prev_sp = this_base + info->size;
1017 /* Assume that the FP is this frame's SP but with that pushed
1018 stack space added back. */
1019 this_base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
1020 prev_sp = this_base + info->size;
1023 /* Add 1 here to adjust for the post-decrement nature of the push
1025 info->prev_sp = avr_make_saddr (prev_sp + 1);
1026 info->base = avr_make_saddr (this_base);
1028 gdbarch = get_frame_arch (this_frame);
1030 /* Adjust all the saved registers so that they contain addresses and not
1032 for (i = 0; i < gdbarch_num_regs (gdbarch) - 1; i++)
1033 if (info->saved_regs[i].addr > 0)
1034 info->saved_regs[i].addr = info->prev_sp - info->saved_regs[i].addr;
1036 /* Except for the main and startup code, the return PC is always saved on
1037 the stack and is at the base of the frame. */
1039 if (info->prologue_type != AVR_PROLOGUE_MAIN)
1040 info->saved_regs[AVR_PC_REGNUM].addr = info->prev_sp;
1042 /* The previous frame's SP needed to be computed. Save the computed
1044 tdep = gdbarch_tdep (gdbarch);
1045 trad_frame_set_value (info->saved_regs, AVR_SP_REGNUM,
1046 info->prev_sp - 1 + tdep->call_length);
1052 avr_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
1056 pc = frame_unwind_register_unsigned (next_frame, AVR_PC_REGNUM);
1058 return avr_make_iaddr (pc);
1062 avr_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
1066 sp = frame_unwind_register_unsigned (next_frame, AVR_SP_REGNUM);
1068 return avr_make_saddr (sp);
1071 /* Given a GDB frame, determine the address of the calling function's
1072 frame. This will be used to create a new GDB frame struct. */
1075 avr_frame_this_id (struct frame_info *this_frame,
1076 void **this_prologue_cache,
1077 struct frame_id *this_id)
1079 struct avr_unwind_cache *info
1080 = avr_frame_unwind_cache (this_frame, this_prologue_cache);
1085 /* The FUNC is easy. */
1086 func = get_frame_func (this_frame);
1088 /* Hopefully the prologue analysis either correctly determined the
1089 frame's base (which is the SP from the previous frame), or set
1090 that base to "NULL". */
1091 base = info->prev_sp;
1095 id = frame_id_build (base, func);
1099 static struct value *
1100 avr_frame_prev_register (struct frame_info *this_frame,
1101 void **this_prologue_cache, int regnum)
1103 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1104 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1105 struct avr_unwind_cache *info
1106 = avr_frame_unwind_cache (this_frame, this_prologue_cache);
1108 if (regnum == AVR_PC_REGNUM || regnum == AVR_PSEUDO_PC_REGNUM)
1110 if (trad_frame_addr_p (info->saved_regs, AVR_PC_REGNUM))
1112 /* Reading the return PC from the PC register is slightly
1113 abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes,
1114 but in reality, only two bytes (3 in upcoming mega256) are
1115 stored on the stack.
1117 Also, note that the value on the stack is an addr to a word
1118 not a byte, so we will need to multiply it by two at some
1121 And to confuse matters even more, the return address stored
1122 on the stack is in big endian byte order, even though most
1123 everything else about the avr is little endian. Ick! */
1127 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1128 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1130 read_memory (info->saved_regs[AVR_PC_REGNUM].addr,
1131 buf, tdep->call_length);
1133 /* Extract the PC read from memory as a big-endian. */
1135 for (i = 0; i < tdep->call_length; i++)
1136 pc = (pc << 8) | buf[i];
1138 if (regnum == AVR_PC_REGNUM)
1141 return frame_unwind_got_constant (this_frame, regnum, pc);
1144 return frame_unwind_got_optimized (this_frame, regnum);
1147 return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
1150 static const struct frame_unwind avr_frame_unwind = {
1152 default_frame_unwind_stop_reason,
1154 avr_frame_prev_register,
1156 default_frame_sniffer
1160 avr_frame_base_address (struct frame_info *this_frame, void **this_cache)
1162 struct avr_unwind_cache *info
1163 = avr_frame_unwind_cache (this_frame, this_cache);
1168 static const struct frame_base avr_frame_base = {
1170 avr_frame_base_address,
1171 avr_frame_base_address,
1172 avr_frame_base_address
1175 /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy
1176 frame. The frame ID's base needs to match the TOS value saved by
1177 save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */
1179 static struct frame_id
1180 avr_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
1184 base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
1185 return frame_id_build (avr_make_saddr (base), get_frame_pc (this_frame));
1188 /* When arguments must be pushed onto the stack, they go on in reverse
1189 order. The below implements a FILO (stack) to do this. */
1194 struct stack_item *prev;
1198 static struct stack_item *
1199 push_stack_item (struct stack_item *prev, const bfd_byte *contents, int len)
1201 struct stack_item *si;
1202 si = xmalloc (sizeof (struct stack_item));
1203 si->data = xmalloc (len);
1206 memcpy (si->data, contents, len);
1210 static struct stack_item *pop_stack_item (struct stack_item *si);
1211 static struct stack_item *
1212 pop_stack_item (struct stack_item *si)
1214 struct stack_item *dead = si;
1221 /* Setup the function arguments for calling a function in the inferior.
1223 On the AVR architecture, there are 18 registers (R25 to R8) which are
1224 dedicated for passing function arguments. Up to the first 18 arguments
1225 (depending on size) may go into these registers. The rest go on the stack.
1227 All arguments are aligned to start in even-numbered registers (odd-sized
1228 arguments, including char, have one free register above them). For example,
1229 an int in arg1 and a char in arg2 would be passed as such:
1234 Arguments that are larger than 2 bytes will be split between two or more
1235 registers as available, but will NOT be split between a register and the
1236 stack. Arguments that go onto the stack are pushed last arg first (this is
1237 similar to the d10v). */
1239 /* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be
1242 An exceptional case exists for struct arguments (and possibly other
1243 aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but
1244 not a multiple of WORDSIZE bytes. In this case the argument is never split
1245 between the registers and the stack, but instead is copied in its entirety
1246 onto the stack, AND also copied into as many registers as there is room
1247 for. In other words, space in registers permitting, two copies of the same
1248 argument are passed in. As far as I can tell, only the one on the stack is
1249 used, although that may be a function of the level of compiler
1250 optimization. I suspect this is a compiler bug. Arguments of these odd
1251 sizes are left-justified within the word (as opposed to arguments smaller
1252 than WORDSIZE bytes, which are right-justified).
1254 If the function is to return an aggregate type such as a struct, the caller
1255 must allocate space into which the callee will copy the return value. In
1256 this case, a pointer to the return value location is passed into the callee
1257 in register R0, which displaces one of the other arguments passed in via
1258 registers R0 to R2. */
1261 avr_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
1262 struct regcache *regcache, CORE_ADDR bp_addr,
1263 int nargs, struct value **args, CORE_ADDR sp,
1264 int struct_return, CORE_ADDR struct_addr)
1266 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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 last_regnum = regnum - (len + (len & 1));
1298 /* If there are registers available, use them. Once we start putting
1299 stuff on the stack, all subsequent args go on stack. */
1300 if ((si == NULL) && (last_regnum >= 8))
1304 /* Skip a register for odd length args. */
1308 val = extract_unsigned_integer (contents, len, byte_order);
1309 for (j = 0; j < len; j++)
1310 regcache_cooked_write_unsigned
1311 (regcache, regnum--, val >> (8 * (len - j - 1)));
1313 /* No registers available, push the args onto the stack. */
1316 /* From here on, we don't care about regnum. */
1317 si = push_stack_item (si, contents, len);
1321 /* Push args onto the stack. */
1325 /* Add 1 to sp here to account for post decr nature of pushes. */
1326 write_memory (sp + 1, si->data, si->len);
1327 si = pop_stack_item (si);
1330 /* Set the return address. For the avr, the return address is the BP_ADDR.
1331 Need to push the return address onto the stack noting that it needs to be
1332 in big-endian order on the stack. */
1333 for (i = 1; i <= call_length; i++)
1335 buf[call_length - i] = return_pc & 0xff;
1340 /* Use 'sp + 1' since pushes are post decr ops. */
1341 write_memory (sp + 1, buf, call_length);
1343 /* Finally, update the SP register. */
1344 regcache_cooked_write_unsigned (regcache, AVR_SP_REGNUM,
1345 avr_convert_saddr_to_raw (sp));
1347 /* Return SP value for the dummy frame, where the return address hasn't been
1349 return sp + call_length;
1352 /* Unfortunately dwarf2 register for SP is 32. */
1355 avr_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
1357 if (reg >= 0 && reg < 32)
1360 return AVR_SP_REGNUM;
1362 warning (_("Unmapped DWARF Register #%d encountered."), reg);
1367 /* Implementation of `address_class_type_flags' gdbarch method.
1369 This method maps DW_AT_address_class attributes to a
1370 type_instance_flag_value. */
1373 avr_address_class_type_flags (int byte_size, int dwarf2_addr_class)
1375 /* The value 1 of the DW_AT_address_class attribute corresponds to the
1376 __flash qualifier. Note that this attribute is only valid with
1377 pointer types and therefore the flag is set to the pointer type and
1378 not its target type. */
1379 if (dwarf2_addr_class == 1 && byte_size == 2)
1380 return AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH;
1384 /* Implementation of `address_class_type_flags_to_name' gdbarch method.
1386 Convert a type_instance_flag_value to an address space qualifier. */
1389 avr_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
1391 if (type_flags & AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH)
1397 /* Implementation of `address_class_name_to_type_flags' gdbarch method.
1399 Convert an address space qualifier to a type_instance_flag_value. */
1402 avr_address_class_name_to_type_flags (struct gdbarch *gdbarch,
1404 int *type_flags_ptr)
1406 if (strcmp (name, "flash") == 0)
1408 *type_flags_ptr = AVR_TYPE_INSTANCE_FLAG_ADDRESS_CLASS_FLASH;
1415 /* Initialize the gdbarch structure for the AVR's. */
1417 static struct gdbarch *
1418 avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1420 struct gdbarch *gdbarch;
1421 struct gdbarch_tdep *tdep;
1422 struct gdbarch_list *best_arch;
1425 /* Avr-6 call instructions save 3 bytes. */
1426 switch (info.bfd_arch_info->mach)
1429 case bfd_mach_avrxmega1:
1431 case bfd_mach_avrxmega2:
1433 case bfd_mach_avrxmega3:
1435 case bfd_mach_avrxmega4:
1437 case bfd_mach_avrxmega5:
1442 case bfd_mach_avrxmega6:
1443 case bfd_mach_avrxmega7:
1448 /* If there is already a candidate, use it. */
1449 for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
1451 best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
1453 if (gdbarch_tdep (best_arch->gdbarch)->call_length == call_length)
1454 return best_arch->gdbarch;
1457 /* None found, create a new architecture from the information provided. */
1458 tdep = XNEW (struct gdbarch_tdep);
1459 gdbarch = gdbarch_alloc (&info, tdep);
1461 tdep->call_length = call_length;
1463 /* Create a type for PC. We can't use builtin types here, as they may not
1465 tdep->void_type = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void");
1466 tdep->func_void_type = make_function_type (tdep->void_type, NULL);
1467 tdep->pc_type = arch_type (gdbarch, TYPE_CODE_PTR, 4, NULL);
1468 TYPE_TARGET_TYPE (tdep->pc_type) = tdep->func_void_type;
1469 TYPE_UNSIGNED (tdep->pc_type) = 1;
1471 set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1472 set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1473 set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1474 set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
1475 set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1476 set_gdbarch_addr_bit (gdbarch, 32);
1478 set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1479 set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1480 set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1482 set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
1483 set_gdbarch_double_format (gdbarch, floatformats_ieee_single);
1484 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_single);
1486 set_gdbarch_read_pc (gdbarch, avr_read_pc);
1487 set_gdbarch_write_pc (gdbarch, avr_write_pc);
1489 set_gdbarch_num_regs (gdbarch, AVR_NUM_REGS);
1491 set_gdbarch_sp_regnum (gdbarch, AVR_SP_REGNUM);
1492 set_gdbarch_pc_regnum (gdbarch, AVR_PC_REGNUM);
1494 set_gdbarch_register_name (gdbarch, avr_register_name);
1495 set_gdbarch_register_type (gdbarch, avr_register_type);
1497 set_gdbarch_num_pseudo_regs (gdbarch, AVR_NUM_PSEUDO_REGS);
1498 set_gdbarch_pseudo_register_read (gdbarch, avr_pseudo_register_read);
1499 set_gdbarch_pseudo_register_write (gdbarch, avr_pseudo_register_write);
1501 set_gdbarch_return_value (gdbarch, avr_return_value);
1502 set_gdbarch_print_insn (gdbarch, print_insn_avr);
1504 set_gdbarch_push_dummy_call (gdbarch, avr_push_dummy_call);
1506 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, avr_dwarf_reg_to_regnum);
1508 set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer);
1509 set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address);
1510 set_gdbarch_integer_to_address (gdbarch, avr_integer_to_address);
1512 set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue);
1513 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1515 set_gdbarch_breakpoint_from_pc (gdbarch, avr_breakpoint_from_pc);
1517 frame_unwind_append_unwinder (gdbarch, &avr_frame_unwind);
1518 frame_base_set_default (gdbarch, &avr_frame_base);
1520 set_gdbarch_dummy_id (gdbarch, avr_dummy_id);
1522 set_gdbarch_unwind_pc (gdbarch, avr_unwind_pc);
1523 set_gdbarch_unwind_sp (gdbarch, avr_unwind_sp);
1525 set_gdbarch_address_class_type_flags (gdbarch, avr_address_class_type_flags);
1526 set_gdbarch_address_class_name_to_type_flags
1527 (gdbarch, avr_address_class_name_to_type_flags);
1528 set_gdbarch_address_class_type_flags_to_name
1529 (gdbarch, avr_address_class_type_flags_to_name);
1534 /* Send a query request to the avr remote target asking for values of the io
1535 registers. If args parameter is not NULL, then the user has requested info
1536 on a specific io register [This still needs implemented and is ignored for
1537 now]. The query string should be one of these forms:
1539 "Ravr.io_reg" -> reply is "NN" number of io registers
1541 "Ravr.io_reg:addr,len" where addr is first register and len is number of
1542 registers to be read. The reply should be "<NAME>,VV;" for each io register
1543 where, <NAME> is a string, and VV is the hex value of the register.
1545 All io registers are 8-bit. */
1548 avr_io_reg_read_command (char *args, int from_tty)
1555 unsigned int nreg = 0;
1559 /* Find out how many io registers the target has. */
1560 bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
1561 "avr.io_reg", &buf);
1562 bufstr = (const char *) buf;
1566 fprintf_unfiltered (gdb_stderr,
1567 _("ERR: info io_registers NOT supported "
1568 "by current target\n"));
1572 if (sscanf (bufstr, "%x", &nreg) != 1)
1574 fprintf_unfiltered (gdb_stderr,
1575 _("Error fetching number of io registers\n"));
1582 reinitialize_more_filter ();
1584 printf_unfiltered (_("Target has %u io registers:\n\n"), nreg);
1586 /* only fetch up to 8 registers at a time to keep the buffer small */
1589 for (i = 0; i < nreg; i += step)
1591 /* how many registers this round? */
1594 j = nreg - i; /* last block is less than 8 registers */
1596 snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j);
1597 bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
1600 p = (const char *) buf;
1601 for (k = i; k < (i + j); k++)
1603 if (sscanf (p, "%[^,],%x;", query, &val) == 2)
1605 printf_filtered ("[%02x] %-15s : %02x\n", k, query, val);
1606 while ((*p != ';') && (*p != '\0'))
1608 p++; /* skip over ';' */
1618 extern initialize_file_ftype _initialize_avr_tdep; /* -Wmissing-prototypes */
1621 _initialize_avr_tdep (void)
1623 register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init);
1625 /* Add a new command to allow the user to query the avr remote target for
1626 the values of the io space registers in a saner way than just using
1629 /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
1630 io_registers' to signify it is not available on other platforms. */
1632 add_cmd ("io_registers", class_info, avr_io_reg_read_command,
1633 _("query remote avr target for io space register values"),