1 /* Target-dependent code for Atmel AVR, for GDB.
3 Copyright (C) 1996-2013 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"
37 #include "gdb_string.h"
39 #include "linux-tdep.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 */
86 AVR_NUM_REGS = 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/,
87 AVR_NUM_REG_BYTES = 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/,
89 /* Pseudo registers. */
90 AVR_PSEUDO_PC_REGNUM = 35,
91 AVR_NUM_PSEUDO_REGS = 1,
93 AVR_PC_REG_INDEX = 35, /* index into array of registers */
95 AVR_MAX_PROLOGUE_SIZE = 64, /* bytes */
97 /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */
100 /* Number of the last pushed register. r17 for current avr-gcc */
101 AVR_LAST_PUSHED_REGNUM = 17,
103 AVR_ARG1_REGNUM = 24, /* Single byte argument */
104 AVR_ARGN_REGNUM = 25, /* Multi byte argments */
106 AVR_RET1_REGNUM = 24, /* Single byte return value */
107 AVR_RETN_REGNUM = 25, /* Multi byte return value */
109 /* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8
110 bits? Do these have to match the bfd vma values? It sure would make
111 things easier in the future if they didn't need to match.
113 Note: I chose these values so as to be consistent with bfd vma
116 TRoth/2002-04-08: There is already a conflict with very large programs
117 in the mega128. The mega128 has 128K instruction bytes (64K words),
118 thus the Most Significant Bit is 0x10000 which gets masked off my
121 The problem manifests itself when trying to set a breakpoint in a
122 function which resides in the upper half of the instruction space and
123 thus requires a 17-bit address.
125 For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK
126 from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
127 but could be for some remote targets by just adding the correct offset
128 to the address and letting the remote target handle the low-level
129 details of actually accessing the eeprom. */
131 AVR_IMEM_START = 0x00000000, /* INSN memory */
132 AVR_SMEM_START = 0x00800000, /* SRAM memory */
134 /* No eeprom mask defined */
135 AVR_MEM_MASK = 0x00f00000, /* mask to determine memory space */
137 AVR_EMEM_START = 0x00810000, /* EEPROM memory */
138 AVR_MEM_MASK = 0x00ff0000, /* mask to determine memory space */
144 NORMAL and CALL are the typical types (the -mcall-prologues gcc option
145 causes the generation of the CALL type prologues). */
148 AVR_PROLOGUE_NONE, /* No prologue */
150 AVR_PROLOGUE_CALL, /* -mcall-prologues */
152 AVR_PROLOGUE_INTR, /* interrupt handler */
153 AVR_PROLOGUE_SIG, /* signal handler */
156 /* Any function with a frame looks like this
157 ....... <-SP POINTS HERE
158 LOCALS1 <-FP POINTS HERE
167 struct avr_unwind_cache
169 /* The previous frame's inner most stack address. Used as this
170 frame ID's stack_addr. */
172 /* The frame's base, optionally used by the high-level debug info. */
176 /* Table indicating the location of each and every register. */
177 struct trad_frame_saved_reg *saved_regs;
182 /* Number of bytes stored to the stack by call instructions.
183 2 bytes for avr1-5, 3 bytes for avr6. */
187 struct type *void_type;
188 /* Type for a function returning void. */
189 struct type *func_void_type;
190 /* Type for a pointer to a function. Used for the type of PC. */
191 struct type *pc_type;
194 /* This enum represents the signals' numbers on the AVR
195 architecture. It just contains the signal definitions which are
196 different from the generic implementation.
198 It is derived from the file <arch/avr32/include/uapi/asm/signal.h>,
199 from the Linux kernel tree. */
203 AVR_LINUX_SIGRTMIN = 32,
204 AVR_LINUX_SIGRTMAX = 63,
207 /* Lookup the name of a register given it's number. */
210 avr_register_name (struct gdbarch *gdbarch, int regnum)
212 static const char * const register_names[] = {
213 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
214 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
215 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
216 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
222 if (regnum >= (sizeof (register_names) / sizeof (*register_names)))
224 return register_names[regnum];
227 /* Return the GDB type object for the "standard" data type
228 of data in register N. */
231 avr_register_type (struct gdbarch *gdbarch, int reg_nr)
233 if (reg_nr == AVR_PC_REGNUM)
234 return builtin_type (gdbarch)->builtin_uint32;
235 if (reg_nr == AVR_PSEUDO_PC_REGNUM)
236 return gdbarch_tdep (gdbarch)->pc_type;
237 if (reg_nr == AVR_SP_REGNUM)
238 return builtin_type (gdbarch)->builtin_data_ptr;
239 return builtin_type (gdbarch)->builtin_uint8;
242 /* Instruction address checks and convertions. */
245 avr_make_iaddr (CORE_ADDR x)
247 return ((x) | AVR_IMEM_START);
250 /* FIXME: TRoth: Really need to use a larger mask for instructions. Some
251 devices are already up to 128KBytes of flash space.
253 TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
256 avr_convert_iaddr_to_raw (CORE_ADDR x)
258 return ((x) & 0xffffffff);
261 /* SRAM address checks and convertions. */
264 avr_make_saddr (CORE_ADDR x)
266 /* Return 0 for NULL. */
270 return ((x) | AVR_SMEM_START);
274 avr_convert_saddr_to_raw (CORE_ADDR x)
276 return ((x) & 0xffffffff);
279 /* EEPROM address checks and convertions. I don't know if these will ever
280 actually be used, but I've added them just the same. TRoth */
282 /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
283 programs in the mega128. */
285 /* static CORE_ADDR */
286 /* avr_make_eaddr (CORE_ADDR x) */
288 /* return ((x) | AVR_EMEM_START); */
292 /* avr_eaddr_p (CORE_ADDR x) */
294 /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */
297 /* static CORE_ADDR */
298 /* avr_convert_eaddr_to_raw (CORE_ADDR x) */
300 /* return ((x) & 0xffffffff); */
303 /* Convert from address to pointer and vice-versa. */
306 avr_address_to_pointer (struct gdbarch *gdbarch,
307 struct type *type, gdb_byte *buf, CORE_ADDR addr)
309 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
311 /* Is it a code address? */
312 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
313 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
315 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
316 avr_convert_iaddr_to_raw (addr >> 1));
320 /* Strip off any upper segment bits. */
321 store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order,
322 avr_convert_saddr_to_raw (addr));
327 avr_pointer_to_address (struct gdbarch *gdbarch,
328 struct type *type, const gdb_byte *buf)
330 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
332 = extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
334 /* Is it a code address? */
335 if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
336 || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD
337 || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
338 return avr_make_iaddr (addr << 1);
340 return avr_make_saddr (addr);
344 avr_integer_to_address (struct gdbarch *gdbarch,
345 struct type *type, const gdb_byte *buf)
347 ULONGEST addr = unpack_long (type, buf);
349 return avr_make_saddr (addr);
353 avr_read_pc (struct regcache *regcache)
356 regcache_cooked_read_unsigned (regcache, AVR_PC_REGNUM, &pc);
357 return avr_make_iaddr (pc);
361 avr_write_pc (struct regcache *regcache, CORE_ADDR val)
363 regcache_cooked_write_unsigned (regcache, AVR_PC_REGNUM,
364 avr_convert_iaddr_to_raw (val));
367 static enum register_status
368 avr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
369 int regnum, gdb_byte *buf)
372 enum register_status status;
376 case AVR_PSEUDO_PC_REGNUM:
377 status = regcache_raw_read_unsigned (regcache, AVR_PC_REGNUM, &val);
378 if (status != REG_VALID)
381 store_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch), val);
384 internal_error (__FILE__, __LINE__, _("invalid regnum"));
389 avr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
390 int regnum, const gdb_byte *buf)
396 case AVR_PSEUDO_PC_REGNUM:
397 val = extract_unsigned_integer (buf, 4, gdbarch_byte_order (gdbarch));
399 regcache_raw_write_unsigned (regcache, AVR_PC_REGNUM, val);
402 internal_error (__FILE__, __LINE__, _("invalid regnum"));
406 /* Function: avr_scan_prologue
408 This function decodes an AVR function prologue to determine:
409 1) the size of the stack frame
410 2) which registers are saved on it
411 3) the offsets of saved regs
412 This information is stored in the avr_unwind_cache structure.
414 Some devices lack the sbiw instruction, so on those replace this:
420 A typical AVR function prologue with a frame pointer might look like this:
421 push rXX ; saved regs
427 sbiw r28,<LOCALS_SIZE>
428 in __tmp_reg__,__SREG__
431 out __SREG__,__tmp_reg__
434 A typical AVR function prologue without a frame pointer might look like
436 push rXX ; saved regs
439 A main function prologue looks like this:
440 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
441 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
445 A signal handler prologue looks like this:
448 in __tmp_reg__, __SREG__
451 push rXX ; save registers r18:r27, r30:r31
453 push r28 ; save frame pointer
457 sbiw r28, <LOCALS_SIZE>
461 A interrupt 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>
480 A `-mcall-prologues' prologue looks like this (Note that the megas use a
481 jmp instead of a rjmp, thus the prologue is one word larger since jmp is a
482 32 bit insn and rjmp is a 16 bit insn):
483 ldi r26,lo8(<LOCALS_SIZE>)
484 ldi r27,hi8(<LOCALS_SIZE>)
485 ldi r30,pm_lo8(.L_foo_body)
486 ldi r31,pm_hi8(.L_foo_body)
487 rjmp __prologue_saves__+RRR
490 /* Not really part of a prologue, but still need to scan for it, is when a
491 function prologue moves values passed via registers as arguments to new
492 registers. In this case, all local variables live in registers, so there
493 may be some register saves. This is what it looks like:
497 There could be multiple movw's. If the target doesn't have a movw insn, it
498 will use two mov insns. This could be done after any of the above prologue
502 avr_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR pc_beg, CORE_ADDR pc_end,
503 struct avr_unwind_cache *info)
505 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
509 struct minimal_symbol *msymbol;
510 unsigned char prologue[AVR_MAX_PROLOGUE_SIZE];
514 len = pc_end - pc_beg;
515 if (len > AVR_MAX_PROLOGUE_SIZE)
516 len = AVR_MAX_PROLOGUE_SIZE;
518 /* FIXME: TRoth/2003-06-11: This could be made more efficient by only
519 reading in the bytes of the prologue. The problem is that the figuring
520 out where the end of the prologue is is a bit difficult. The old code
521 tried to do that, but failed quite often. */
522 read_memory (pc_beg, prologue, len);
524 /* Scanning main()'s prologue
525 ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
526 ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
533 static const unsigned char img[] = {
534 0xde, 0xbf, /* out __SP_H__,r29 */
535 0xcd, 0xbf /* out __SP_L__,r28 */
538 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
539 /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
540 if ((insn & 0xf0f0) == 0xe0c0)
542 locals = (insn & 0xf) | ((insn & 0x0f00) >> 4);
543 insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
544 /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
545 if ((insn & 0xf0f0) == 0xe0d0)
547 locals |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
548 if (vpc + 4 + sizeof (img) < len
549 && memcmp (prologue + vpc + 4, img, sizeof (img)) == 0)
551 info->prologue_type = AVR_PROLOGUE_MAIN;
559 /* Scanning `-mcall-prologues' prologue
560 Classic prologue is 10 bytes, mega prologue is a 12 bytes long */
562 while (1) /* Using a while to avoid many goto's */
569 /* At least the fifth instruction must have been executed to
570 modify frame shape. */
574 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
575 /* ldi r26,<LOCALS_SIZE> */
576 if ((insn & 0xf0f0) != 0xe0a0)
578 loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4);
581 insn = extract_unsigned_integer (&prologue[vpc + 2], 2, byte_order);
582 /* ldi r27,<LOCALS_SIZE> / 256 */
583 if ((insn & 0xf0f0) != 0xe0b0)
585 loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
588 insn = extract_unsigned_integer (&prologue[vpc + 4], 2, byte_order);
589 /* ldi r30,pm_lo8(.L_foo_body) */
590 if ((insn & 0xf0f0) != 0xe0e0)
592 body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4);
595 insn = extract_unsigned_integer (&prologue[vpc + 6], 2, byte_order);
596 /* ldi r31,pm_hi8(.L_foo_body) */
597 if ((insn & 0xf0f0) != 0xe0f0)
599 body_addr |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
602 msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL);
606 insn = extract_unsigned_integer (&prologue[vpc + 8], 2, byte_order);
607 /* rjmp __prologue_saves__+RRR */
608 if ((insn & 0xf000) == 0xc000)
610 /* Extract PC relative offset from RJMP */
611 i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0);
612 /* Convert offset to byte addressable mode */
614 /* Destination address */
617 if (body_addr != (pc_beg + 10)/2)
622 else if ((insn & 0xfe0e) == 0x940c)
624 /* Extract absolute PC address from JMP */
625 i = (((insn & 0x1) | ((insn & 0x1f0) >> 3) << 16)
626 | (extract_unsigned_integer (&prologue[vpc + 10], 2, byte_order)
628 /* Convert address to byte addressable mode */
631 if (body_addr != (pc_beg + 12)/2)
639 /* Resolve offset (in words) from __prologue_saves__ symbol.
640 Which is a pushes count in `-mcall-prologues' mode */
641 num_pushes = AVR_MAX_PUSHES - (i - SYMBOL_VALUE_ADDRESS (msymbol)) / 2;
643 if (num_pushes > AVR_MAX_PUSHES)
645 fprintf_unfiltered (gdb_stderr, _("Num pushes too large: %d\n"),
654 info->saved_regs[AVR_FP_REGNUM + 1].addr = num_pushes;
656 info->saved_regs[AVR_FP_REGNUM].addr = num_pushes - 1;
659 for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2);
660 from <= AVR_LAST_PUSHED_REGNUM; ++from)
661 info->saved_regs [from].addr = ++i;
663 info->size = loc_size + num_pushes;
664 info->prologue_type = AVR_PROLOGUE_CALL;
666 return pc_beg + pc_offset;
669 /* Scan for the beginning of the prologue for an interrupt or signal
670 function. Note that we have to set the prologue type here since the
671 third stage of the prologue may not be present (e.g. no saved registered
672 or changing of the SP register). */
676 static const unsigned char img[] = {
677 0x78, 0x94, /* sei */
678 0x1f, 0x92, /* push r1 */
679 0x0f, 0x92, /* push r0 */
680 0x0f, 0xb6, /* in r0,0x3f SREG */
681 0x0f, 0x92, /* push r0 */
682 0x11, 0x24 /* clr r1 */
684 if (len >= sizeof (img)
685 && memcmp (prologue, img, sizeof (img)) == 0)
687 info->prologue_type = AVR_PROLOGUE_INTR;
689 info->saved_regs[AVR_SREG_REGNUM].addr = 3;
690 info->saved_regs[0].addr = 2;
691 info->saved_regs[1].addr = 1;
694 else if (len >= sizeof (img) - 2
695 && memcmp (img + 2, prologue, sizeof (img) - 2) == 0)
697 info->prologue_type = AVR_PROLOGUE_SIG;
698 vpc += sizeof (img) - 2;
699 info->saved_regs[AVR_SREG_REGNUM].addr = 3;
700 info->saved_regs[0].addr = 2;
701 info->saved_regs[1].addr = 1;
706 /* First stage of the prologue scanning.
707 Scan pushes (saved registers) */
709 for (; vpc < len; vpc += 2)
711 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
712 if ((insn & 0xfe0f) == 0x920f) /* push rXX */
714 /* Bits 4-9 contain a mask for registers R0-R32. */
715 int regno = (insn & 0x1f0) >> 4;
717 info->saved_regs[regno].addr = info->size;
724 gdb_assert (vpc < AVR_MAX_PROLOGUE_SIZE);
726 /* Handle static small stack allocation using rcall or push. */
728 while (scan_stage == 1 && vpc < len)
730 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
731 if (insn == 0xd000) /* rcall .+0 */
733 info->size += gdbarch_tdep (gdbarch)->call_length;
736 else if (insn == 0x920f) /* push r0 */
745 /* Second stage of the prologue scanning.
750 if (scan_stage == 1 && vpc < len)
752 static const unsigned char img[] = {
753 0xcd, 0xb7, /* in r28,__SP_L__ */
754 0xde, 0xb7 /* in r29,__SP_H__ */
757 if (vpc + sizeof (img) < len
758 && memcmp (prologue + vpc, img, sizeof (img)) == 0)
765 /* Third stage of the prologue scanning. (Really two stages).
767 sbiw r28,XX or subi r28,lo8(XX)
769 in __tmp_reg__,__SREG__
772 out __SREG__,__tmp_reg__
775 if (scan_stage == 2 && vpc < len)
778 static const unsigned char img[] = {
779 0x0f, 0xb6, /* in r0,0x3f */
780 0xf8, 0x94, /* cli */
781 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
782 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */
783 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
785 static const unsigned char img_sig[] = {
786 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
787 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
789 static const unsigned char img_int[] = {
790 0xf8, 0x94, /* cli */
791 0xde, 0xbf, /* out 0x3e,r29 ; SPH */
792 0x78, 0x94, /* sei */
793 0xcd, 0xbf /* out 0x3d,r28 ; SPL */
796 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
797 if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */
799 locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
802 else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
804 locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4);
806 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
808 locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4)) << 8;
813 /* Scan the last part of the prologue. May not be present for interrupt
814 or signal handler functions, which is why we set the prologue type
815 when we saw the beginning of the prologue previously. */
817 if (vpc + sizeof (img_sig) < len
818 && memcmp (prologue + vpc, img_sig, sizeof (img_sig)) == 0)
820 vpc += sizeof (img_sig);
822 else if (vpc + sizeof (img_int) < len
823 && memcmp (prologue + vpc, img_int, sizeof (img_int)) == 0)
825 vpc += sizeof (img_int);
827 if (vpc + sizeof (img) < len
828 && memcmp (prologue + vpc, img, sizeof (img)) == 0)
830 info->prologue_type = AVR_PROLOGUE_NORMAL;
834 info->size += locals_size;
839 /* If we got this far, we could not scan the prologue, so just return the pc
840 of the frame plus an adjustment for argument move insns. */
842 for (; vpc < len; vpc += 2)
844 insn = extract_unsigned_integer (&prologue[vpc], 2, byte_order);
845 if ((insn & 0xff00) == 0x0100) /* movw rXX, rYY */
847 else if ((insn & 0xfc00) == 0x2c00) /* mov rXX, rYY */
857 avr_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
859 CORE_ADDR func_addr, func_end;
860 CORE_ADDR post_prologue_pc;
862 /* See what the symbol table says */
864 if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
867 post_prologue_pc = skip_prologue_using_sal (gdbarch, func_addr);
868 if (post_prologue_pc != 0)
869 return max (pc, post_prologue_pc);
872 CORE_ADDR prologue_end = pc;
873 struct avr_unwind_cache info = {0};
874 struct trad_frame_saved_reg saved_regs[AVR_NUM_REGS];
876 info.saved_regs = saved_regs;
878 /* Need to run the prologue scanner to figure out if the function has a
879 prologue and possibly skip over moving arguments passed via registers
880 to other registers. */
882 prologue_end = avr_scan_prologue (gdbarch, func_addr, func_end, &info);
884 if (info.prologue_type != AVR_PROLOGUE_NONE)
888 /* Either we didn't find the start of this function (nothing we can do),
889 or there's no line info, or the line after the prologue is after
890 the end of the function (there probably isn't a prologue). */
895 /* Not all avr devices support the BREAK insn. Those that don't should treat
896 it as a NOP. Thus, it should be ok. Since the avr is currently a remote
897 only target, this shouldn't be a problem (I hope). TRoth/2003-05-14 */
899 static const unsigned char *
900 avr_breakpoint_from_pc (struct gdbarch *gdbarch,
901 CORE_ADDR *pcptr, int *lenptr)
903 static const unsigned char avr_break_insn [] = { 0x98, 0x95 };
904 *lenptr = sizeof (avr_break_insn);
905 return avr_break_insn;
908 /* Determine, for architecture GDBARCH, how a return value of TYPE
909 should be returned. If it is supposed to be returned in registers,
910 and READBUF is non-zero, read the appropriate value from REGCACHE,
911 and copy it into READBUF. If WRITEBUF is non-zero, write the value
912 from WRITEBUF into REGCACHE. */
914 static enum return_value_convention
915 avr_return_value (struct gdbarch *gdbarch, struct value *function,
916 struct type *valtype, struct regcache *regcache,
917 gdb_byte *readbuf, const gdb_byte *writebuf)
920 /* Single byte are returned in r24.
921 Otherwise, the MSB of the return value is always in r25, calculate which
922 register holds the LSB. */
925 if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT
926 || TYPE_CODE (valtype) == TYPE_CODE_UNION
927 || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
928 && TYPE_LENGTH (valtype) > 8)
929 return RETURN_VALUE_STRUCT_CONVENTION;
931 if (TYPE_LENGTH (valtype) <= 2)
933 else if (TYPE_LENGTH (valtype) <= 4)
935 else if (TYPE_LENGTH (valtype) <= 8)
938 gdb_assert_not_reached ("unexpected type length");
940 if (writebuf != NULL)
942 for (i = 0; i < TYPE_LENGTH (valtype); i++)
943 regcache_cooked_write (regcache, lsb_reg + i, writebuf + i);
948 for (i = 0; i < TYPE_LENGTH (valtype); i++)
949 regcache_cooked_read (regcache, lsb_reg + i, readbuf + i);
952 return RETURN_VALUE_REGISTER_CONVENTION;
956 /* Put here the code to store, into fi->saved_regs, the addresses of
957 the saved registers of frame described by FRAME_INFO. This
958 includes special registers such as pc and fp saved in special ways
959 in the stack frame. sp is even more special: the address we return
960 for it IS the sp for the next frame. */
962 static struct avr_unwind_cache *
963 avr_frame_unwind_cache (struct frame_info *this_frame,
964 void **this_prologue_cache)
966 CORE_ADDR start_pc, current_pc;
969 struct avr_unwind_cache *info;
970 struct gdbarch *gdbarch;
971 struct gdbarch_tdep *tdep;
974 if (*this_prologue_cache)
975 return *this_prologue_cache;
977 info = FRAME_OBSTACK_ZALLOC (struct avr_unwind_cache);
978 *this_prologue_cache = info;
979 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
982 info->prologue_type = AVR_PROLOGUE_NONE;
984 start_pc = get_frame_func (this_frame);
985 current_pc = get_frame_pc (this_frame);
986 if ((start_pc > 0) && (start_pc <= current_pc))
987 avr_scan_prologue (get_frame_arch (this_frame),
988 start_pc, current_pc, info);
990 if ((info->prologue_type != AVR_PROLOGUE_NONE)
991 && (info->prologue_type != AVR_PROLOGUE_MAIN))
993 ULONGEST high_base; /* High byte of FP */
995 /* The SP was moved to the FP. This indicates that a new frame
996 was created. Get THIS frame's FP value by unwinding it from
998 this_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM);
999 high_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM + 1);
1000 this_base += (high_base << 8);
1002 /* The FP points at the last saved register. Adjust the FP back
1003 to before the first saved register giving the SP. */
1004 prev_sp = this_base + info->size;
1008 /* Assume that the FP is this frame's SP but with that pushed
1009 stack space added back. */
1010 this_base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
1011 prev_sp = this_base + info->size;
1014 /* Add 1 here to adjust for the post-decrement nature of the push
1016 info->prev_sp = avr_make_saddr (prev_sp + 1);
1017 info->base = avr_make_saddr (this_base);
1019 gdbarch = get_frame_arch (this_frame);
1021 /* Adjust all the saved registers so that they contain addresses and not
1023 for (i = 0; i < gdbarch_num_regs (gdbarch) - 1; i++)
1024 if (info->saved_regs[i].addr > 0)
1025 info->saved_regs[i].addr = info->prev_sp - info->saved_regs[i].addr;
1027 /* Except for the main and startup code, the return PC is always saved on
1028 the stack and is at the base of the frame. */
1030 if (info->prologue_type != AVR_PROLOGUE_MAIN)
1031 info->saved_regs[AVR_PC_REGNUM].addr = info->prev_sp;
1033 /* The previous frame's SP needed to be computed. Save the computed
1035 tdep = gdbarch_tdep (gdbarch);
1036 trad_frame_set_value (info->saved_regs, AVR_SP_REGNUM,
1037 info->prev_sp - 1 + tdep->call_length);
1043 avr_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
1047 pc = frame_unwind_register_unsigned (next_frame, AVR_PC_REGNUM);
1049 return avr_make_iaddr (pc);
1053 avr_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
1057 sp = frame_unwind_register_unsigned (next_frame, AVR_SP_REGNUM);
1059 return avr_make_saddr (sp);
1062 /* Given a GDB frame, determine the address of the calling function's
1063 frame. This will be used to create a new GDB frame struct. */
1066 avr_frame_this_id (struct frame_info *this_frame,
1067 void **this_prologue_cache,
1068 struct frame_id *this_id)
1070 struct avr_unwind_cache *info
1071 = avr_frame_unwind_cache (this_frame, this_prologue_cache);
1076 /* The FUNC is easy. */
1077 func = get_frame_func (this_frame);
1079 /* Hopefully the prologue analysis either correctly determined the
1080 frame's base (which is the SP from the previous frame), or set
1081 that base to "NULL". */
1082 base = info->prev_sp;
1086 id = frame_id_build (base, func);
1090 static struct value *
1091 avr_frame_prev_register (struct frame_info *this_frame,
1092 void **this_prologue_cache, int regnum)
1094 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1095 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1096 struct avr_unwind_cache *info
1097 = avr_frame_unwind_cache (this_frame, this_prologue_cache);
1099 if (regnum == AVR_PC_REGNUM || regnum == AVR_PSEUDO_PC_REGNUM)
1101 if (trad_frame_addr_p (info->saved_regs, AVR_PC_REGNUM))
1103 /* Reading the return PC from the PC register is slightly
1104 abnormal. register_size(AVR_PC_REGNUM) says it is 4 bytes,
1105 but in reality, only two bytes (3 in upcoming mega256) are
1106 stored on the stack.
1108 Also, note that the value on the stack is an addr to a word
1109 not a byte, so we will need to multiply it by two at some
1112 And to confuse matters even more, the return address stored
1113 on the stack is in big endian byte order, even though most
1114 everything else about the avr is little endian. Ick! */
1118 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1119 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1121 read_memory (info->saved_regs[AVR_PC_REGNUM].addr,
1122 buf, tdep->call_length);
1124 /* Extract the PC read from memory as a big-endian. */
1126 for (i = 0; i < tdep->call_length; i++)
1127 pc = (pc << 8) | buf[i];
1129 if (regnum == AVR_PC_REGNUM)
1132 return frame_unwind_got_constant (this_frame, regnum, pc);
1135 return frame_unwind_got_optimized (this_frame, regnum);
1138 return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
1141 static const struct frame_unwind avr_frame_unwind = {
1143 default_frame_unwind_stop_reason,
1145 avr_frame_prev_register,
1147 default_frame_sniffer
1151 avr_frame_base_address (struct frame_info *this_frame, void **this_cache)
1153 struct avr_unwind_cache *info
1154 = avr_frame_unwind_cache (this_frame, this_cache);
1159 static const struct frame_base avr_frame_base = {
1161 avr_frame_base_address,
1162 avr_frame_base_address,
1163 avr_frame_base_address
1166 /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy
1167 frame. The frame ID's base needs to match the TOS value saved by
1168 save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */
1170 static struct frame_id
1171 avr_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
1175 base = get_frame_register_unsigned (this_frame, AVR_SP_REGNUM);
1176 return frame_id_build (avr_make_saddr (base), get_frame_pc (this_frame));
1179 /* When arguments must be pushed onto the stack, they go on in reverse
1180 order. The below implements a FILO (stack) to do this. */
1185 struct stack_item *prev;
1189 static struct stack_item *
1190 push_stack_item (struct stack_item *prev, const bfd_byte *contents, int len)
1192 struct stack_item *si;
1193 si = xmalloc (sizeof (struct stack_item));
1194 si->data = xmalloc (len);
1197 memcpy (si->data, contents, len);
1201 static struct stack_item *pop_stack_item (struct stack_item *si);
1202 static struct stack_item *
1203 pop_stack_item (struct stack_item *si)
1205 struct stack_item *dead = si;
1212 /* Setup the function arguments for calling a function in the inferior.
1214 On the AVR architecture, there are 18 registers (R25 to R8) which are
1215 dedicated for passing function arguments. Up to the first 18 arguments
1216 (depending on size) may go into these registers. The rest go on the stack.
1218 All arguments are aligned to start in even-numbered registers (odd-sized
1219 arguments, including char, have one free register above them). For example,
1220 an int in arg1 and a char in arg2 would be passed as such:
1225 Arguments that are larger than 2 bytes will be split between two or more
1226 registers as available, but will NOT be split between a register and the
1227 stack. Arguments that go onto the stack are pushed last arg first (this is
1228 similar to the d10v). */
1230 /* NOTE: TRoth/2003-06-17: The rest of this comment is old looks to be
1233 An exceptional case exists for struct arguments (and possibly other
1234 aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but
1235 not a multiple of WORDSIZE bytes. In this case the argument is never split
1236 between the registers and the stack, but instead is copied in its entirety
1237 onto the stack, AND also copied into as many registers as there is room
1238 for. In other words, space in registers permitting, two copies of the same
1239 argument are passed in. As far as I can tell, only the one on the stack is
1240 used, although that may be a function of the level of compiler
1241 optimization. I suspect this is a compiler bug. Arguments of these odd
1242 sizes are left-justified within the word (as opposed to arguments smaller
1243 than WORDSIZE bytes, which are right-justified).
1245 If the function is to return an aggregate type such as a struct, the caller
1246 must allocate space into which the callee will copy the return value. In
1247 this case, a pointer to the return value location is passed into the callee
1248 in register R0, which displaces one of the other arguments passed in via
1249 registers R0 to R2. */
1252 avr_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
1253 struct regcache *regcache, CORE_ADDR bp_addr,
1254 int nargs, struct value **args, CORE_ADDR sp,
1255 int struct_return, CORE_ADDR struct_addr)
1257 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1260 int call_length = gdbarch_tdep (gdbarch)->call_length;
1261 CORE_ADDR return_pc = avr_convert_iaddr_to_raw (bp_addr);
1262 int regnum = AVR_ARGN_REGNUM;
1263 struct stack_item *si = NULL;
1267 regcache_cooked_write_unsigned
1268 (regcache, regnum--, (struct_addr >> 8) & 0xff);
1269 regcache_cooked_write_unsigned
1270 (regcache, regnum--, struct_addr & 0xff);
1271 /* SP being post decremented, we need to reserve one byte so that the
1272 return address won't overwrite the result (or vice-versa). */
1273 if (sp == struct_addr)
1277 for (i = 0; i < nargs; i++)
1281 struct value *arg = args[i];
1282 struct type *type = check_typedef (value_type (arg));
1283 const bfd_byte *contents = value_contents (arg);
1284 int len = TYPE_LENGTH (type);
1286 /* Calculate the potential last register needed. */
1287 last_regnum = regnum - (len + (len & 1));
1289 /* If there are registers available, use them. Once we start putting
1290 stuff on the stack, all subsequent args go on stack. */
1291 if ((si == NULL) && (last_regnum >= 8))
1295 /* Skip a register for odd length args. */
1299 val = extract_unsigned_integer (contents, len, byte_order);
1300 for (j = 0; j < len; j++)
1301 regcache_cooked_write_unsigned
1302 (regcache, regnum--, val >> (8 * (len - j - 1)));
1304 /* No registers available, push the args onto the stack. */
1307 /* From here on, we don't care about regnum. */
1308 si = push_stack_item (si, contents, len);
1312 /* Push args onto the stack. */
1316 /* Add 1 to sp here to account for post decr nature of pushes. */
1317 write_memory (sp + 1, si->data, si->len);
1318 si = pop_stack_item (si);
1321 /* Set the return address. For the avr, the return address is the BP_ADDR.
1322 Need to push the return address onto the stack noting that it needs to be
1323 in big-endian order on the stack. */
1324 for (i = 1; i <= call_length; i++)
1326 buf[call_length - i] = return_pc & 0xff;
1331 /* Use 'sp + 1' since pushes are post decr ops. */
1332 write_memory (sp + 1, buf, call_length);
1334 /* Finally, update the SP register. */
1335 regcache_cooked_write_unsigned (regcache, AVR_SP_REGNUM,
1336 avr_convert_saddr_to_raw (sp));
1338 /* Return SP value for the dummy frame, where the return address hasn't been
1340 return sp + call_length;
1343 /* Unfortunately dwarf2 register for SP is 32. */
1346 avr_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
1348 if (reg >= 0 && reg < 32)
1351 return AVR_SP_REGNUM;
1353 warning (_("Unmapped DWARF Register #%d encountered."), reg);
1358 /* Implementation of `gdbarch_gdb_signal_from_target', as defined in
1361 static enum gdb_signal
1362 avr_linux_gdb_signal_from_target (struct gdbarch *gdbarch, int signal)
1364 if (signal >= AVR_LINUX_SIGRTMIN && signal <= AVR_LINUX_SIGRTMAX)
1366 int offset = signal - AVR_LINUX_SIGRTMIN;
1369 return GDB_SIGNAL_REALTIME_32;
1371 return (enum gdb_signal) (offset - 1
1372 + (int) GDB_SIGNAL_REALTIME_33);
1374 else if (signal > AVR_LINUX_SIGRTMAX)
1375 return GDB_SIGNAL_UNKNOWN;
1377 return linux_gdb_signal_from_target (gdbarch, signal);
1380 /* Implementation of `gdbarch_gdb_signal_to_target', as defined in
1384 avr_linux_gdb_signal_to_target (struct gdbarch *gdbarch,
1385 enum gdb_signal signal)
1389 /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>,
1390 therefore we have to handle it here. */
1391 case GDB_SIGNAL_REALTIME_32:
1392 return AVR_LINUX_SIGRTMIN;
1394 /* GDB_SIGNAL_REALTIME_64 is not valid on AVR. */
1395 case GDB_SIGNAL_REALTIME_64:
1399 /* GDB_SIGNAL_REALTIME_33 to _63 are continuous.
1400 AVR does not have _64. */
1401 if (signal >= GDB_SIGNAL_REALTIME_33
1402 && signal <= GDB_SIGNAL_REALTIME_63)
1404 int offset = signal - GDB_SIGNAL_REALTIME_33;
1406 return AVR_LINUX_SIGRTMIN + 1 + offset;
1409 return linux_gdb_signal_to_target (gdbarch, signal);
1412 /* Initialize the gdbarch structure for the AVR's. */
1414 static struct gdbarch *
1415 avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1417 struct gdbarch *gdbarch;
1418 struct gdbarch_tdep *tdep;
1419 struct gdbarch_list *best_arch;
1422 /* Avr-6 call instructions save 3 bytes. */
1423 switch (info.bfd_arch_info->mach)
1438 /* If there is already a candidate, use it. */
1439 for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
1441 best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
1443 if (gdbarch_tdep (best_arch->gdbarch)->call_length == call_length)
1444 return best_arch->gdbarch;
1447 /* None found, create a new architecture from the information provided. */
1448 tdep = XMALLOC (struct gdbarch_tdep);
1449 gdbarch = gdbarch_alloc (&info, tdep);
1451 tdep->call_length = call_length;
1453 /* Create a type for PC. We can't use builtin types here, as they may not
1455 tdep->void_type = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void");
1456 tdep->func_void_type = make_function_type (tdep->void_type, NULL);
1457 tdep->pc_type = arch_type (gdbarch, TYPE_CODE_PTR, 4, NULL);
1458 TYPE_TARGET_TYPE (tdep->pc_type) = tdep->func_void_type;
1459 TYPE_UNSIGNED (tdep->pc_type) = 1;
1461 set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1462 set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1463 set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1464 set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
1465 set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
1466 set_gdbarch_addr_bit (gdbarch, 32);
1468 set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1469 set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1470 set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
1472 set_gdbarch_float_format (gdbarch, floatformats_ieee_single);
1473 set_gdbarch_double_format (gdbarch, floatformats_ieee_single);
1474 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_single);
1476 set_gdbarch_read_pc (gdbarch, avr_read_pc);
1477 set_gdbarch_write_pc (gdbarch, avr_write_pc);
1479 set_gdbarch_num_regs (gdbarch, AVR_NUM_REGS);
1481 set_gdbarch_sp_regnum (gdbarch, AVR_SP_REGNUM);
1482 set_gdbarch_pc_regnum (gdbarch, AVR_PC_REGNUM);
1484 set_gdbarch_register_name (gdbarch, avr_register_name);
1485 set_gdbarch_register_type (gdbarch, avr_register_type);
1487 set_gdbarch_num_pseudo_regs (gdbarch, AVR_NUM_PSEUDO_REGS);
1488 set_gdbarch_pseudo_register_read (gdbarch, avr_pseudo_register_read);
1489 set_gdbarch_pseudo_register_write (gdbarch, avr_pseudo_register_write);
1491 set_gdbarch_return_value (gdbarch, avr_return_value);
1492 set_gdbarch_print_insn (gdbarch, print_insn_avr);
1494 set_gdbarch_push_dummy_call (gdbarch, avr_push_dummy_call);
1496 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, avr_dwarf_reg_to_regnum);
1498 set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer);
1499 set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address);
1500 set_gdbarch_integer_to_address (gdbarch, avr_integer_to_address);
1502 set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue);
1503 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1505 set_gdbarch_breakpoint_from_pc (gdbarch, avr_breakpoint_from_pc);
1507 frame_unwind_append_unwinder (gdbarch, &avr_frame_unwind);
1508 frame_base_set_default (gdbarch, &avr_frame_base);
1510 set_gdbarch_dummy_id (gdbarch, avr_dummy_id);
1512 set_gdbarch_unwind_pc (gdbarch, avr_unwind_pc);
1513 set_gdbarch_unwind_sp (gdbarch, avr_unwind_sp);
1515 set_gdbarch_gdb_signal_from_target (gdbarch,
1516 avr_linux_gdb_signal_from_target);
1517 set_gdbarch_gdb_signal_to_target (gdbarch,
1518 avr_linux_gdb_signal_to_target);
1523 /* Send a query request to the avr remote target asking for values of the io
1524 registers. If args parameter is not NULL, then the user has requested info
1525 on a specific io register [This still needs implemented and is ignored for
1526 now]. The query string should be one of these forms:
1528 "Ravr.io_reg" -> reply is "NN" number of io registers
1530 "Ravr.io_reg:addr,len" where addr is first register and len is number of
1531 registers to be read. The reply should be "<NAME>,VV;" for each io register
1532 where, <NAME> is a string, and VV is the hex value of the register.
1534 All io registers are 8-bit. */
1537 avr_io_reg_read_command (char *args, int from_tty)
1544 unsigned int nreg = 0;
1548 /* Find out how many io registers the target has. */
1549 bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
1550 "avr.io_reg", &buf);
1551 bufstr = (const char *) buf;
1555 fprintf_unfiltered (gdb_stderr,
1556 _("ERR: info io_registers NOT supported "
1557 "by current target\n"));
1561 if (sscanf (bufstr, "%x", &nreg) != 1)
1563 fprintf_unfiltered (gdb_stderr,
1564 _("Error fetching number of io registers\n"));
1571 reinitialize_more_filter ();
1573 printf_unfiltered (_("Target has %u io registers:\n\n"), nreg);
1575 /* only fetch up to 8 registers at a time to keep the buffer small */
1578 for (i = 0; i < nreg; i += step)
1580 /* how many registers this round? */
1583 j = nreg - i; /* last block is less than 8 registers */
1585 snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j);
1586 bufsiz = target_read_alloc (¤t_target, TARGET_OBJECT_AVR,
1589 p = (const char *) buf;
1590 for (k = i; k < (i + j); k++)
1592 if (sscanf (p, "%[^,],%x;", query, &val) == 2)
1594 printf_filtered ("[%02x] %-15s : %02x\n", k, query, val);
1595 while ((*p != ';') && (*p != '\0'))
1597 p++; /* skip over ';' */
1607 extern initialize_file_ftype _initialize_avr_tdep; /* -Wmissing-prototypes */
1610 _initialize_avr_tdep (void)
1612 register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init);
1614 /* Add a new command to allow the user to query the avr remote target for
1615 the values of the io space registers in a saner way than just using
1618 /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
1619 io_registers' to signify it is not available on other platforms. */
1621 add_cmd ("io_registers", class_info, avr_io_reg_read_command,
1622 _("query remote avr target for io space register values"),