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1181 |
sfurman |
/* Target-dependent code for Atmel AVR, for GDB.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* Contributed by Theodore A. Roth, troth@verinet.com */
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/* Portions of this file were taken from the original gdb-4.18 patch developed
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by Denis Chertykov, denisc@overta.ru */
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#include "defs.h"
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#include "gdbcmd.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "symfile.h"
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#include "arch-utils.h"
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#include "regcache.h"
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#include "gdb_string.h"
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/* AVR Background:
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(AVR micros are pure Harvard Architecture processors.)
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The AVR family of microcontrollers have three distinctly different memory
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spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for
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the most part to store program instructions. The sram is 8 bits wide and is
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used for the stack and the heap. Some devices lack sram and some can have
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an additional external sram added on as a peripheral.
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The eeprom is 8 bits wide and is used to store data when the device is
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powered down. Eeprom is not directly accessible, it can only be accessed
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via io-registers using a special algorithm. Accessing eeprom via gdb's
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remote serial protocol ('m' or 'M' packets) looks difficult to do and is
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not included at this time.
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[The eeprom could be read manually via ``x/b <eaddr + AVR_EMEM_START>'' or
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written using ``set {unsigned char}<eaddr + AVR_EMEM_START>''. For this to
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work, the remote target must be able to handle eeprom accesses and perform
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the address translation.]
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All three memory spaces have physical addresses beginning at 0x0. In
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addition, the flash is addressed by gcc/binutils/gdb with respect to 8 bit
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bytes instead of the 16 bit wide words used by the real device for the
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Program Counter.
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In order for remote targets to work correctly, extra bits must be added to
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addresses before they are send to the target or received from the target
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via the remote serial protocol. The extra bits are the MSBs and are used to
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decode which memory space the address is referring to. */
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#undef XMALLOC
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#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
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#undef EXTRACT_INSN
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#define EXTRACT_INSN(addr) extract_unsigned_integer(addr,2)
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/* Constants: prefixed with AVR_ to avoid name space clashes */
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enum
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{
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AVR_REG_W = 24,
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AVR_REG_X = 26,
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AVR_REG_Y = 28,
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AVR_FP_REGNUM = 28,
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AVR_REG_Z = 30,
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AVR_SREG_REGNUM = 32,
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AVR_SP_REGNUM = 33,
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AVR_PC_REGNUM = 34,
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AVR_NUM_REGS = 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/,
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AVR_NUM_REG_BYTES = 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/,
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AVR_PC_REG_INDEX = 35, /* index into array of registers */
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AVR_MAX_PROLOGUE_SIZE = 56, /* bytes */
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/* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */
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AVR_MAX_PUSHES = 18,
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/* Number of the last pushed register. r17 for current avr-gcc */
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AVR_LAST_PUSHED_REGNUM = 17,
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/* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8
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bits? Do these have to match the bfd vma values?. It sure would make
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things easier in the future if they didn't need to match.
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Note: I chose these values so as to be consistent with bfd vma
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addresses.
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TRoth/2002-04-08: There is already a conflict with very large programs
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in the mega128. The mega128 has 128K instruction bytes (64K words),
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thus the Most Significant Bit is 0x10000 which gets masked off my
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AVR_MEM_MASK.
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The problem manifests itself when trying to set a breakpoint in a
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function which resides in the upper half of the instruction space and
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thus requires a 17-bit address.
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For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK
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from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet,
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but could be for some remote targets by just adding the correct offset
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to the address and letting the remote target handle the low-level
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details of actually accessing the eeprom. */
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AVR_IMEM_START = 0x00000000, /* INSN memory */
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AVR_SMEM_START = 0x00800000, /* SRAM memory */
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#if 1
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/* No eeprom mask defined */
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AVR_MEM_MASK = 0x00f00000, /* mask to determine memory space */
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#else
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AVR_EMEM_START = 0x00810000, /* EEPROM memory */
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AVR_MEM_MASK = 0x00ff0000, /* mask to determine memory space */
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#endif
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};
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/* Any function with a frame looks like this
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....... <-SP POINTS HERE
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LOCALS1 <-FP POINTS HERE
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LOCALS0
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SAVED FP
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SAVED R3
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SAVED R2
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RET PC
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FIRST ARG
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SECOND ARG */
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struct frame_extra_info
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{
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CORE_ADDR return_pc;
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CORE_ADDR args_pointer;
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int locals_size;
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int framereg;
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int framesize;
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int is_main;
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};
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struct gdbarch_tdep
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{
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/* FIXME: TRoth: is there anything to put here? */
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int foo;
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};
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/* Lookup the name of a register given it's number. */
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static const char *
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avr_register_name (int regnum)
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{
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static char *register_names[] = {
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
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"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
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"SREG", "SP", "PC"
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};
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if (regnum < 0)
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return NULL;
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if (regnum >= (sizeof (register_names) / sizeof (*register_names)))
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return NULL;
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return register_names[regnum];
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}
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/* Index within `registers' of the first byte of the space for
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register REGNUM. */
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static int
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avr_register_byte (int regnum)
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{
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if (regnum < AVR_PC_REGNUM)
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return regnum;
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else
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return AVR_PC_REG_INDEX;
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}
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/* Number of bytes of storage in the actual machine representation for
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register REGNUM. */
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static int
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avr_register_raw_size (int regnum)
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{
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switch (regnum)
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{
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case AVR_PC_REGNUM:
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return 4;
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case AVR_SP_REGNUM:
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case AVR_FP_REGNUM:
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return 2;
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default:
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return 1;
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}
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}
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/* Number of bytes of storage in the program's representation
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for register N. */
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static int
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avr_register_virtual_size (int regnum)
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{
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return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum));
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}
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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static struct type *
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avr_register_virtual_type (int regnum)
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{
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switch (regnum)
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{
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case AVR_PC_REGNUM:
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return builtin_type_unsigned_long;
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case AVR_SP_REGNUM:
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return builtin_type_unsigned_short;
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default:
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return builtin_type_unsigned_char;
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}
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}
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/* Instruction address checks and convertions. */
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static CORE_ADDR
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avr_make_iaddr (CORE_ADDR x)
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{
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return ((x) | AVR_IMEM_START);
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}
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static int
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avr_iaddr_p (CORE_ADDR x)
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{
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return (((x) & AVR_MEM_MASK) == AVR_IMEM_START);
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}
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/* FIXME: TRoth: Really need to use a larger mask for instructions. Some
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devices are already up to 128KBytes of flash space.
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TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */
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static CORE_ADDR
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avr_convert_iaddr_to_raw (CORE_ADDR x)
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{
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return ((x) & 0xffffffff);
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}
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/* SRAM address checks and convertions. */
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static CORE_ADDR
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avr_make_saddr (CORE_ADDR x)
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{
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return ((x) | AVR_SMEM_START);
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}
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static int
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avr_saddr_p (CORE_ADDR x)
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{
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return (((x) & AVR_MEM_MASK) == AVR_SMEM_START);
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}
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static CORE_ADDR
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avr_convert_saddr_to_raw (CORE_ADDR x)
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{
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return ((x) & 0xffffffff);
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}
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/* EEPROM address checks and convertions. I don't know if these will ever
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actually be used, but I've added them just the same. TRoth */
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283 |
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/* TRoth/2002-04-08: Commented out for now to allow fix for problem with large
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programs in the mega128. */
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/* static CORE_ADDR */
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/* avr_make_eaddr (CORE_ADDR x) */
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/* { */
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/* return ((x) | AVR_EMEM_START); */
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/* } */
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/* static int */
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/* avr_eaddr_p (CORE_ADDR x) */
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/* { */
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/* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */
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/* } */
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/* static CORE_ADDR */
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/* avr_convert_eaddr_to_raw (CORE_ADDR x) */
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/* { */
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/* return ((x) & 0xffffffff); */
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/* } */
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/* Convert from address to pointer and vice-versa. */
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static void
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avr_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr)
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{
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309 |
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/* Is it a code address? */
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if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
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|| TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
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{
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store_unsigned_integer (buf, TYPE_LENGTH (type),
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avr_convert_iaddr_to_raw (addr));
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}
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else
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{
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318 |
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/* Strip off any upper segment bits. */
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store_unsigned_integer (buf, TYPE_LENGTH (type),
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avr_convert_saddr_to_raw (addr));
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}
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}
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static CORE_ADDR
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avr_pointer_to_address (struct type *type, void *buf)
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{
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CORE_ADDR addr = extract_address (buf, TYPE_LENGTH (type));
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328 |
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329 |
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if (TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
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{
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fprintf_unfiltered (gdb_stderr, "CODE_SPACE ---->> ptr->addr: 0x%lx\n",
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addr);
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fprintf_unfiltered (gdb_stderr,
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"+++ If you see this, please send me an email <troth@verinet.com>\n");
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}
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/* Is it a code address? */
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338 |
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if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC
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|| TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD
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|| TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type)))
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return avr_make_iaddr (addr);
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else
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return avr_make_saddr (addr);
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}
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345 |
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static CORE_ADDR
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avr_read_pc (ptid_t ptid)
|
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{
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349 |
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ptid_t save_ptid;
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350 |
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CORE_ADDR pc;
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351 |
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CORE_ADDR retval;
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352 |
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save_ptid = inferior_ptid;
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inferior_ptid = ptid;
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pc = (int) read_register (AVR_PC_REGNUM);
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inferior_ptid = save_ptid;
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retval = avr_make_iaddr (pc);
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return retval;
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}
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360 |
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361 |
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static void
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362 |
|
|
avr_write_pc (CORE_ADDR val, ptid_t ptid)
|
363 |
|
|
{
|
364 |
|
|
ptid_t save_ptid;
|
365 |
|
|
|
366 |
|
|
save_ptid = inferior_ptid;
|
367 |
|
|
inferior_ptid = ptid;
|
368 |
|
|
write_register (AVR_PC_REGNUM, avr_convert_iaddr_to_raw (val));
|
369 |
|
|
inferior_ptid = save_ptid;
|
370 |
|
|
}
|
371 |
|
|
|
372 |
|
|
static CORE_ADDR
|
373 |
|
|
avr_read_sp (void)
|
374 |
|
|
{
|
375 |
|
|
return (avr_make_saddr (read_register (AVR_SP_REGNUM)));
|
376 |
|
|
}
|
377 |
|
|
|
378 |
|
|
static void
|
379 |
|
|
avr_write_sp (CORE_ADDR val)
|
380 |
|
|
{
|
381 |
|
|
write_register (AVR_SP_REGNUM, avr_convert_saddr_to_raw (val));
|
382 |
|
|
}
|
383 |
|
|
|
384 |
|
|
static CORE_ADDR
|
385 |
|
|
avr_read_fp (void)
|
386 |
|
|
{
|
387 |
|
|
return (avr_make_saddr (read_register (AVR_FP_REGNUM)));
|
388 |
|
|
}
|
389 |
|
|
|
390 |
|
|
/* Translate a GDB virtual ADDR/LEN into a format the remote target
|
391 |
|
|
understands. Returns number of bytes that can be transfered
|
392 |
|
|
starting at TARG_ADDR. Return ZERO if no bytes can be transfered
|
393 |
|
|
(segmentation fault).
|
394 |
|
|
|
395 |
|
|
TRoth/2002-04-08: Could this be used to check for dereferencing an invalid
|
396 |
|
|
pointer? */
|
397 |
|
|
|
398 |
|
|
static void
|
399 |
|
|
avr_remote_translate_xfer_address (CORE_ADDR memaddr, int nr_bytes,
|
400 |
|
|
CORE_ADDR *targ_addr, int *targ_len)
|
401 |
|
|
{
|
402 |
|
|
long out_addr;
|
403 |
|
|
long out_len;
|
404 |
|
|
|
405 |
|
|
/* FIXME: TRoth: Do nothing for now. Will need to examine memaddr at this
|
406 |
|
|
point and see if the high bit are set with the masks that we want. */
|
407 |
|
|
|
408 |
|
|
*targ_addr = memaddr;
|
409 |
|
|
*targ_len = nr_bytes;
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
/* Function pointers obtained from the target are half of what gdb expects so
|
413 |
|
|
multiply by 2. */
|
414 |
|
|
|
415 |
|
|
static CORE_ADDR
|
416 |
|
|
avr_convert_from_func_ptr_addr (CORE_ADDR addr)
|
417 |
|
|
{
|
418 |
|
|
return addr * 2;
|
419 |
|
|
}
|
420 |
|
|
|
421 |
|
|
/* avr_scan_prologue is also used as the frame_init_saved_regs().
|
422 |
|
|
|
423 |
|
|
Put here the code to store, into fi->saved_regs, the addresses of
|
424 |
|
|
the saved registers of frame described by FRAME_INFO. This
|
425 |
|
|
includes special registers such as pc and fp saved in special ways
|
426 |
|
|
in the stack frame. sp is even more special: the address we return
|
427 |
|
|
for it IS the sp for the next frame. */
|
428 |
|
|
|
429 |
|
|
/* Function: avr_scan_prologue (helper function for avr_init_extra_frame_info)
|
430 |
|
|
This function decodes a AVR function prologue to determine:
|
431 |
|
|
1) the size of the stack frame
|
432 |
|
|
2) which registers are saved on it
|
433 |
|
|
3) the offsets of saved regs
|
434 |
|
|
This information is stored in the "extra_info" field of the frame_info.
|
435 |
|
|
|
436 |
|
|
A typical AVR function prologue might look like this:
|
437 |
|
|
push rXX
|
438 |
|
|
push r28
|
439 |
|
|
push r29
|
440 |
|
|
in r28,__SP_L__
|
441 |
|
|
in r29,__SP_H__
|
442 |
|
|
sbiw r28,<LOCALS_SIZE>
|
443 |
|
|
in __tmp_reg__,__SREG__
|
444 |
|
|
cli
|
445 |
|
|
out __SP_L__,r28
|
446 |
|
|
out __SREG__,__tmp_reg__
|
447 |
|
|
out __SP_H__,r29
|
448 |
|
|
|
449 |
|
|
A `-mcall-prologues' prologue look like this:
|
450 |
|
|
ldi r26,<LOCALS_SIZE>
|
451 |
|
|
ldi r27,<LOCALS_SIZE>/265
|
452 |
|
|
ldi r30,pm_lo8(.L_foo_body)
|
453 |
|
|
ldi r31,pm_hi8(.L_foo_body)
|
454 |
|
|
rjmp __prologue_saves__+RRR
|
455 |
|
|
.L_foo_body: */
|
456 |
|
|
|
457 |
|
|
static void
|
458 |
|
|
avr_scan_prologue (struct frame_info *fi)
|
459 |
|
|
{
|
460 |
|
|
CORE_ADDR prologue_start;
|
461 |
|
|
CORE_ADDR prologue_end;
|
462 |
|
|
int i;
|
463 |
|
|
unsigned short insn;
|
464 |
|
|
int regno;
|
465 |
|
|
int scan_stage = 0;
|
466 |
|
|
char *name;
|
467 |
|
|
struct minimal_symbol *msymbol;
|
468 |
|
|
int prologue_len;
|
469 |
|
|
unsigned char prologue[AVR_MAX_PROLOGUE_SIZE];
|
470 |
|
|
int vpc = 0;
|
471 |
|
|
|
472 |
|
|
fi->extra_info->framereg = AVR_SP_REGNUM;
|
473 |
|
|
|
474 |
|
|
if (find_pc_partial_function
|
475 |
|
|
(fi->pc, &name, &prologue_start, &prologue_end))
|
476 |
|
|
{
|
477 |
|
|
struct symtab_and_line sal = find_pc_line (prologue_start, 0);
|
478 |
|
|
|
479 |
|
|
if (sal.line == 0) /* no line info, use current PC */
|
480 |
|
|
prologue_end = fi->pc;
|
481 |
|
|
else if (sal.end < prologue_end) /* next line begins after fn end */
|
482 |
|
|
prologue_end = sal.end; /* (probably means no prologue) */
|
483 |
|
|
}
|
484 |
|
|
else
|
485 |
|
|
/* We're in the boondocks: allow for */
|
486 |
|
|
/* 19 pushes, an add, and "mv fp,sp" */
|
487 |
|
|
prologue_end = prologue_start + AVR_MAX_PROLOGUE_SIZE;
|
488 |
|
|
|
489 |
|
|
prologue_end = min (prologue_end, fi->pc);
|
490 |
|
|
|
491 |
|
|
/* Search the prologue looking for instructions that set up the
|
492 |
|
|
frame pointer, adjust the stack pointer, and save registers. */
|
493 |
|
|
|
494 |
|
|
fi->extra_info->framesize = 0;
|
495 |
|
|
prologue_len = prologue_end - prologue_start;
|
496 |
|
|
read_memory (prologue_start, prologue, prologue_len);
|
497 |
|
|
|
498 |
|
|
/* Scanning main()'s prologue
|
499 |
|
|
ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>)
|
500 |
|
|
ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>)
|
501 |
|
|
out __SP_H__,r29
|
502 |
|
|
out __SP_L__,r28 */
|
503 |
|
|
|
504 |
|
|
if (name && strcmp ("main", name) == 0 && prologue_len == 8)
|
505 |
|
|
{
|
506 |
|
|
CORE_ADDR locals;
|
507 |
|
|
unsigned char img[] = {
|
508 |
|
|
0xde, 0xbf, /* out __SP_H__,r29 */
|
509 |
|
|
0xcd, 0xbf /* out __SP_L__,r28 */
|
510 |
|
|
};
|
511 |
|
|
|
512 |
|
|
fi->extra_info->framereg = AVR_FP_REGNUM;
|
513 |
|
|
insn = EXTRACT_INSN (&prologue[vpc]);
|
514 |
|
|
/* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */
|
515 |
|
|
if ((insn & 0xf0f0) == 0xe0c0)
|
516 |
|
|
{
|
517 |
|
|
locals = (insn & 0xf) | ((insn & 0x0f00) >> 4);
|
518 |
|
|
insn = EXTRACT_INSN (&prologue[vpc + 2]);
|
519 |
|
|
/* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */
|
520 |
|
|
if ((insn & 0xf0f0) == 0xe0d0)
|
521 |
|
|
{
|
522 |
|
|
locals |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
|
523 |
|
|
if (memcmp (prologue + vpc + 4, img, sizeof (img)) == 0)
|
524 |
|
|
{
|
525 |
|
|
fi->frame = locals;
|
526 |
|
|
|
527 |
|
|
fi->extra_info->is_main = 1;
|
528 |
|
|
return;
|
529 |
|
|
}
|
530 |
|
|
}
|
531 |
|
|
}
|
532 |
|
|
}
|
533 |
|
|
|
534 |
|
|
/* Scanning `-mcall-prologues' prologue
|
535 |
|
|
FIXME: mega prologue have a 12 bytes long */
|
536 |
|
|
|
537 |
|
|
while (prologue_len <= 12) /* I'm use while to avoit many goto's */
|
538 |
|
|
{
|
539 |
|
|
int loc_size;
|
540 |
|
|
int body_addr;
|
541 |
|
|
unsigned num_pushes;
|
542 |
|
|
|
543 |
|
|
insn = EXTRACT_INSN (&prologue[vpc]);
|
544 |
|
|
/* ldi r26,<LOCALS_SIZE> */
|
545 |
|
|
if ((insn & 0xf0f0) != 0xe0a0)
|
546 |
|
|
break;
|
547 |
|
|
loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4);
|
548 |
|
|
|
549 |
|
|
insn = EXTRACT_INSN (&prologue[vpc + 2]);
|
550 |
|
|
/* ldi r27,<LOCALS_SIZE> / 256 */
|
551 |
|
|
if ((insn & 0xf0f0) != 0xe0b0)
|
552 |
|
|
break;
|
553 |
|
|
loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
|
554 |
|
|
|
555 |
|
|
insn = EXTRACT_INSN (&prologue[vpc + 4]);
|
556 |
|
|
/* ldi r30,pm_lo8(.L_foo_body) */
|
557 |
|
|
if ((insn & 0xf0f0) != 0xe0e0)
|
558 |
|
|
break;
|
559 |
|
|
body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4);
|
560 |
|
|
|
561 |
|
|
insn = EXTRACT_INSN (&prologue[vpc + 6]);
|
562 |
|
|
/* ldi r31,pm_hi8(.L_foo_body) */
|
563 |
|
|
if ((insn & 0xf0f0) != 0xe0f0)
|
564 |
|
|
break;
|
565 |
|
|
body_addr |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8;
|
566 |
|
|
|
567 |
|
|
if (body_addr != (prologue_start + 10) / 2)
|
568 |
|
|
break;
|
569 |
|
|
|
570 |
|
|
msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL);
|
571 |
|
|
if (!msymbol)
|
572 |
|
|
break;
|
573 |
|
|
|
574 |
|
|
/* FIXME: prologue for mega have a JMP instead of RJMP */
|
575 |
|
|
insn = EXTRACT_INSN (&prologue[vpc + 8]);
|
576 |
|
|
/* rjmp __prologue_saves__+RRR */
|
577 |
|
|
if ((insn & 0xf000) != 0xc000)
|
578 |
|
|
break;
|
579 |
|
|
|
580 |
|
|
/* Extract PC relative offset from RJMP */
|
581 |
|
|
i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0);
|
582 |
|
|
/* Convert offset to byte addressable mode */
|
583 |
|
|
i *= 2;
|
584 |
|
|
/* Destination address */
|
585 |
|
|
i += vpc + prologue_start + 10;
|
586 |
|
|
/* Resovle offset (in words) from __prologue_saves__ symbol.
|
587 |
|
|
Which is a pushes count in `-mcall-prologues' mode */
|
588 |
|
|
num_pushes = AVR_MAX_PUSHES - (i - SYMBOL_VALUE_ADDRESS (msymbol)) / 2;
|
589 |
|
|
|
590 |
|
|
if (num_pushes > AVR_MAX_PUSHES)
|
591 |
|
|
num_pushes = 0;
|
592 |
|
|
|
593 |
|
|
if (num_pushes)
|
594 |
|
|
{
|
595 |
|
|
int from;
|
596 |
|
|
fi->saved_regs[AVR_FP_REGNUM + 1] = num_pushes;
|
597 |
|
|
if (num_pushes >= 2)
|
598 |
|
|
fi->saved_regs[AVR_FP_REGNUM] = num_pushes - 1;
|
599 |
|
|
i = 0;
|
600 |
|
|
for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2);
|
601 |
|
|
from <= AVR_LAST_PUSHED_REGNUM; ++from)
|
602 |
|
|
fi->saved_regs[from] = ++i;
|
603 |
|
|
}
|
604 |
|
|
fi->extra_info->locals_size = loc_size;
|
605 |
|
|
fi->extra_info->framesize = loc_size + num_pushes;
|
606 |
|
|
fi->extra_info->framereg = AVR_FP_REGNUM;
|
607 |
|
|
return;
|
608 |
|
|
}
|
609 |
|
|
|
610 |
|
|
/* Scan interrupt or signal function */
|
611 |
|
|
|
612 |
|
|
if (prologue_len >= 12)
|
613 |
|
|
{
|
614 |
|
|
unsigned char img[] = {
|
615 |
|
|
0x78, 0x94, /* sei */
|
616 |
|
|
0x1f, 0x92, /* push r1 */
|
617 |
|
|
0x0f, 0x92, /* push r0 */
|
618 |
|
|
0x0f, 0xb6, /* in r0,0x3f SREG */
|
619 |
|
|
0x0f, 0x92, /* push r0 */
|
620 |
|
|
0x11, 0x24 /* clr r1 */
|
621 |
|
|
};
|
622 |
|
|
if (memcmp (prologue, img, sizeof (img)) == 0)
|
623 |
|
|
{
|
624 |
|
|
vpc += sizeof (img);
|
625 |
|
|
fi->saved_regs[0] = 2;
|
626 |
|
|
fi->saved_regs[1] = 1;
|
627 |
|
|
fi->extra_info->framesize += 3;
|
628 |
|
|
}
|
629 |
|
|
else if (memcmp (img + 1, prologue, sizeof (img) - 1) == 0)
|
630 |
|
|
{
|
631 |
|
|
vpc += sizeof (img) - 1;
|
632 |
|
|
fi->saved_regs[0] = 2;
|
633 |
|
|
fi->saved_regs[1] = 1;
|
634 |
|
|
fi->extra_info->framesize += 3;
|
635 |
|
|
}
|
636 |
|
|
}
|
637 |
|
|
|
638 |
|
|
/* First stage of the prologue scanning.
|
639 |
|
|
Scan pushes */
|
640 |
|
|
|
641 |
|
|
for (; vpc <= prologue_len; vpc += 2)
|
642 |
|
|
{
|
643 |
|
|
insn = EXTRACT_INSN (&prologue[vpc]);
|
644 |
|
|
if ((insn & 0xfe0f) == 0x920f) /* push rXX */
|
645 |
|
|
{
|
646 |
|
|
/* Bits 4-9 contain a mask for registers R0-R32. */
|
647 |
|
|
regno = (insn & 0x1f0) >> 4;
|
648 |
|
|
++fi->extra_info->framesize;
|
649 |
|
|
fi->saved_regs[regno] = fi->extra_info->framesize;
|
650 |
|
|
scan_stage = 1;
|
651 |
|
|
}
|
652 |
|
|
else
|
653 |
|
|
break;
|
654 |
|
|
}
|
655 |
|
|
|
656 |
|
|
/* Second stage of the prologue scanning.
|
657 |
|
|
Scan:
|
658 |
|
|
in r28,__SP_L__
|
659 |
|
|
in r29,__SP_H__ */
|
660 |
|
|
|
661 |
|
|
if (scan_stage == 1 && vpc + 4 <= prologue_len)
|
662 |
|
|
{
|
663 |
|
|
unsigned char img[] = {
|
664 |
|
|
0xcd, 0xb7, /* in r28,__SP_L__ */
|
665 |
|
|
0xde, 0xb7 /* in r29,__SP_H__ */
|
666 |
|
|
};
|
667 |
|
|
unsigned short insn1;
|
668 |
|
|
|
669 |
|
|
if (memcmp (prologue + vpc, img, sizeof (img)) == 0)
|
670 |
|
|
{
|
671 |
|
|
vpc += 4;
|
672 |
|
|
fi->extra_info->framereg = AVR_FP_REGNUM;
|
673 |
|
|
scan_stage = 2;
|
674 |
|
|
}
|
675 |
|
|
}
|
676 |
|
|
|
677 |
|
|
/* Third stage of the prologue scanning. (Really two stages)
|
678 |
|
|
Scan for:
|
679 |
|
|
sbiw r28,XX or subi r28,lo8(XX)
|
680 |
|
|
sbci r29,hi8(XX)
|
681 |
|
|
in __tmp_reg__,__SREG__
|
682 |
|
|
cli
|
683 |
|
|
out __SP_L__,r28
|
684 |
|
|
out __SREG__,__tmp_reg__
|
685 |
|
|
out __SP_H__,r29 */
|
686 |
|
|
|
687 |
|
|
if (scan_stage == 2 && vpc + 12 <= prologue_len)
|
688 |
|
|
{
|
689 |
|
|
int locals_size = 0;
|
690 |
|
|
unsigned char img[] = {
|
691 |
|
|
0x0f, 0xb6, /* in r0,0x3f */
|
692 |
|
|
0xf8, 0x94, /* cli */
|
693 |
|
|
0xcd, 0xbf, /* out 0x3d,r28 ; SPL */
|
694 |
|
|
0x0f, 0xbe, /* out 0x3f,r0 ; SREG */
|
695 |
|
|
0xde, 0xbf /* out 0x3e,r29 ; SPH */
|
696 |
|
|
};
|
697 |
|
|
unsigned char img_sig[] = {
|
698 |
|
|
0xcd, 0xbf, /* out 0x3d,r28 ; SPL */
|
699 |
|
|
0xde, 0xbf /* out 0x3e,r29 ; SPH */
|
700 |
|
|
};
|
701 |
|
|
unsigned char img_int[] = {
|
702 |
|
|
0xf8, 0x94, /* cli */
|
703 |
|
|
0xcd, 0xbf, /* out 0x3d,r28 ; SPL */
|
704 |
|
|
0x78, 0x94, /* sei */
|
705 |
|
|
0xde, 0xbf /* out 0x3e,r29 ; SPH */
|
706 |
|
|
};
|
707 |
|
|
|
708 |
|
|
insn = EXTRACT_INSN (&prologue[vpc]);
|
709 |
|
|
vpc += 2;
|
710 |
|
|
if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */
|
711 |
|
|
locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2);
|
712 |
|
|
else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */
|
713 |
|
|
{
|
714 |
|
|
locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4);
|
715 |
|
|
insn = EXTRACT_INSN (&prologue[vpc]);
|
716 |
|
|
vpc += 2;
|
717 |
|
|
locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4) << 8);
|
718 |
|
|
}
|
719 |
|
|
else
|
720 |
|
|
return;
|
721 |
|
|
fi->extra_info->locals_size = locals_size;
|
722 |
|
|
fi->extra_info->framesize += locals_size;
|
723 |
|
|
}
|
724 |
|
|
}
|
725 |
|
|
|
726 |
|
|
/* This function actually figures out the frame address for a given pc and
|
727 |
|
|
sp. This is tricky because we sometimes don't use an explicit
|
728 |
|
|
frame pointer, and the previous stack pointer isn't necessarily recorded
|
729 |
|
|
on the stack. The only reliable way to get this info is to
|
730 |
|
|
examine the prologue. */
|
731 |
|
|
|
732 |
|
|
static void
|
733 |
|
|
avr_init_extra_frame_info (int fromleaf, struct frame_info *fi)
|
734 |
|
|
{
|
735 |
|
|
int reg;
|
736 |
|
|
|
737 |
|
|
if (fi->next)
|
738 |
|
|
fi->pc = FRAME_SAVED_PC (fi->next);
|
739 |
|
|
|
740 |
|
|
fi->extra_info = (struct frame_extra_info *)
|
741 |
|
|
frame_obstack_alloc (sizeof (struct frame_extra_info));
|
742 |
|
|
frame_saved_regs_zalloc (fi);
|
743 |
|
|
|
744 |
|
|
fi->extra_info->return_pc = 0;
|
745 |
|
|
fi->extra_info->args_pointer = 0;
|
746 |
|
|
fi->extra_info->locals_size = 0;
|
747 |
|
|
fi->extra_info->framereg = 0;
|
748 |
|
|
fi->extra_info->framesize = 0;
|
749 |
|
|
fi->extra_info->is_main = 0;
|
750 |
|
|
|
751 |
|
|
avr_scan_prologue (fi);
|
752 |
|
|
|
753 |
|
|
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
|
754 |
|
|
{
|
755 |
|
|
/* We need to setup fi->frame here because run_stack_dummy gets it wrong
|
756 |
|
|
by assuming it's always FP. */
|
757 |
|
|
fi->frame = generic_read_register_dummy (fi->pc, fi->frame,
|
758 |
|
|
AVR_PC_REGNUM);
|
759 |
|
|
}
|
760 |
|
|
else if (!fi->next) /* this is the innermost frame? */
|
761 |
|
|
fi->frame = read_register (fi->extra_info->framereg);
|
762 |
|
|
else if (fi->extra_info->is_main != 1) /* not the innermost frame, not `main' */
|
763 |
|
|
/* If we have an next frame, the callee saved it. */
|
764 |
|
|
{
|
765 |
|
|
struct frame_info *next_fi = fi->next;
|
766 |
|
|
if (fi->extra_info->framereg == AVR_SP_REGNUM)
|
767 |
|
|
fi->frame =
|
768 |
|
|
next_fi->frame + 2 /* ret addr */ + next_fi->extra_info->framesize;
|
769 |
|
|
/* FIXME: I don't analyse va_args functions */
|
770 |
|
|
else
|
771 |
|
|
{
|
772 |
|
|
CORE_ADDR fp = 0;
|
773 |
|
|
CORE_ADDR fp1 = 0;
|
774 |
|
|
unsigned int fp_low, fp_high;
|
775 |
|
|
|
776 |
|
|
/* Scan all frames */
|
777 |
|
|
for (; next_fi; next_fi = next_fi->next)
|
778 |
|
|
{
|
779 |
|
|
/* look for saved AVR_FP_REGNUM */
|
780 |
|
|
if (next_fi->saved_regs[AVR_FP_REGNUM] && !fp)
|
781 |
|
|
fp = next_fi->saved_regs[AVR_FP_REGNUM];
|
782 |
|
|
/* look for saved AVR_FP_REGNUM + 1 */
|
783 |
|
|
if (next_fi->saved_regs[AVR_FP_REGNUM + 1] && !fp1)
|
784 |
|
|
fp1 = next_fi->saved_regs[AVR_FP_REGNUM + 1];
|
785 |
|
|
}
|
786 |
|
|
fp_low = (fp ? read_memory_unsigned_integer (avr_make_saddr (fp), 1)
|
787 |
|
|
: read_register (AVR_FP_REGNUM)) & 0xff;
|
788 |
|
|
fp_high =
|
789 |
|
|
(fp1 ? read_memory_unsigned_integer (avr_make_saddr (fp1), 1) :
|
790 |
|
|
read_register (AVR_FP_REGNUM + 1)) & 0xff;
|
791 |
|
|
fi->frame = fp_low | (fp_high << 8);
|
792 |
|
|
}
|
793 |
|
|
}
|
794 |
|
|
|
795 |
|
|
/* TRoth: Do we want to do this if we are in main? I don't think we should
|
796 |
|
|
since return_pc makes no sense when we are in main. */
|
797 |
|
|
|
798 |
|
|
if ((fi->pc) && (fi->extra_info->is_main == 0)) /* We are not in CALL_DUMMY */
|
799 |
|
|
{
|
800 |
|
|
CORE_ADDR addr;
|
801 |
|
|
int i;
|
802 |
|
|
|
803 |
|
|
addr = fi->frame + fi->extra_info->framesize + 1;
|
804 |
|
|
|
805 |
|
|
/* Return address in stack in different endianness */
|
806 |
|
|
|
807 |
|
|
fi->extra_info->return_pc =
|
808 |
|
|
read_memory_unsigned_integer (avr_make_saddr (addr), 1) << 8;
|
809 |
|
|
fi->extra_info->return_pc |=
|
810 |
|
|
read_memory_unsigned_integer (avr_make_saddr (addr + 1), 1);
|
811 |
|
|
|
812 |
|
|
/* This return address in words,
|
813 |
|
|
must be converted to the bytes address */
|
814 |
|
|
fi->extra_info->return_pc *= 2;
|
815 |
|
|
|
816 |
|
|
/* Resolve a pushed registers addresses */
|
817 |
|
|
for (i = 0; i < NUM_REGS; i++)
|
818 |
|
|
{
|
819 |
|
|
if (fi->saved_regs[i])
|
820 |
|
|
fi->saved_regs[i] = addr - fi->saved_regs[i];
|
821 |
|
|
}
|
822 |
|
|
}
|
823 |
|
|
}
|
824 |
|
|
|
825 |
|
|
/* Restore the machine to the state it had before the current frame was
|
826 |
|
|
created. Usually used either by the "RETURN" command, or by
|
827 |
|
|
call_function_by_hand after the dummy_frame is finished. */
|
828 |
|
|
|
829 |
|
|
static void
|
830 |
|
|
avr_pop_frame (void)
|
831 |
|
|
{
|
832 |
|
|
unsigned regnum;
|
833 |
|
|
CORE_ADDR saddr;
|
834 |
|
|
struct frame_info *frame = get_current_frame ();
|
835 |
|
|
|
836 |
|
|
if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
|
837 |
|
|
{
|
838 |
|
|
generic_pop_dummy_frame ();
|
839 |
|
|
}
|
840 |
|
|
else
|
841 |
|
|
{
|
842 |
|
|
/* TRoth: Why only loop over 8 registers? */
|
843 |
|
|
|
844 |
|
|
for (regnum = 0; regnum < 8; regnum++)
|
845 |
|
|
{
|
846 |
|
|
/* Don't forget AVR_SP_REGNUM in a frame_saved_regs struct is the
|
847 |
|
|
actual value we want, not the address of the value we want. */
|
848 |
|
|
if (frame->saved_regs[regnum] && regnum != AVR_SP_REGNUM)
|
849 |
|
|
{
|
850 |
|
|
saddr = avr_make_saddr (frame->saved_regs[regnum]);
|
851 |
|
|
write_register (regnum,
|
852 |
|
|
read_memory_unsigned_integer (saddr, 1));
|
853 |
|
|
}
|
854 |
|
|
else if (frame->saved_regs[regnum] && regnum == AVR_SP_REGNUM)
|
855 |
|
|
write_register (regnum, frame->frame + 2);
|
856 |
|
|
}
|
857 |
|
|
|
858 |
|
|
/* Don't forget the update the PC too! */
|
859 |
|
|
write_pc (frame->extra_info->return_pc);
|
860 |
|
|
}
|
861 |
|
|
flush_cached_frames ();
|
862 |
|
|
}
|
863 |
|
|
|
864 |
|
|
/* Return the saved PC from this frame. */
|
865 |
|
|
|
866 |
|
|
static CORE_ADDR
|
867 |
|
|
avr_frame_saved_pc (struct frame_info *frame)
|
868 |
|
|
{
|
869 |
|
|
if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
|
870 |
|
|
return generic_read_register_dummy (frame->pc, frame->frame,
|
871 |
|
|
AVR_PC_REGNUM);
|
872 |
|
|
else
|
873 |
|
|
return frame->extra_info->return_pc;
|
874 |
|
|
}
|
875 |
|
|
|
876 |
|
|
static CORE_ADDR
|
877 |
|
|
avr_saved_pc_after_call (struct frame_info *frame)
|
878 |
|
|
{
|
879 |
|
|
unsigned char m1, m2;
|
880 |
|
|
unsigned int sp = read_register (AVR_SP_REGNUM);
|
881 |
|
|
m1 = read_memory_unsigned_integer (avr_make_saddr (sp + 1), 1);
|
882 |
|
|
m2 = read_memory_unsigned_integer (avr_make_saddr (sp + 2), 1);
|
883 |
|
|
return (m2 | (m1 << 8)) * 2;
|
884 |
|
|
}
|
885 |
|
|
|
886 |
|
|
/* Figure out where in REGBUF the called function has left its return value.
|
887 |
|
|
Copy that into VALBUF. */
|
888 |
|
|
|
889 |
|
|
static void
|
890 |
|
|
avr_extract_return_value (struct type *type, char *regbuf, char *valbuf)
|
891 |
|
|
{
|
892 |
|
|
int wordsize, len;
|
893 |
|
|
|
894 |
|
|
wordsize = 2;
|
895 |
|
|
|
896 |
|
|
len = TYPE_LENGTH (type);
|
897 |
|
|
|
898 |
|
|
switch (len)
|
899 |
|
|
{
|
900 |
|
|
case 1: /* (char) */
|
901 |
|
|
case 2: /* (short), (int) */
|
902 |
|
|
memcpy (valbuf, regbuf + REGISTER_BYTE (24), 2);
|
903 |
|
|
break;
|
904 |
|
|
case 4: /* (long), (float) */
|
905 |
|
|
memcpy (valbuf, regbuf + REGISTER_BYTE (22), 4);
|
906 |
|
|
break;
|
907 |
|
|
case 8: /* (double) (doesn't seem to happen, which is good,
|
908 |
|
|
because this almost certainly isn't right. */
|
909 |
|
|
error ("I don't know how a double is returned.");
|
910 |
|
|
break;
|
911 |
|
|
}
|
912 |
|
|
}
|
913 |
|
|
|
914 |
|
|
/* Returns the return address for a dummy. */
|
915 |
|
|
|
916 |
|
|
static CORE_ADDR
|
917 |
|
|
avr_call_dummy_address (void)
|
918 |
|
|
{
|
919 |
|
|
return entry_point_address ();
|
920 |
|
|
}
|
921 |
|
|
|
922 |
|
|
/* Place the appropriate value in the appropriate registers.
|
923 |
|
|
Primarily used by the RETURN command. */
|
924 |
|
|
|
925 |
|
|
static void
|
926 |
|
|
avr_store_return_value (struct type *type, char *valbuf)
|
927 |
|
|
{
|
928 |
|
|
int wordsize, len, regval;
|
929 |
|
|
|
930 |
|
|
wordsize = 2;
|
931 |
|
|
|
932 |
|
|
len = TYPE_LENGTH (type);
|
933 |
|
|
switch (len)
|
934 |
|
|
{
|
935 |
|
|
case 1: /* char */
|
936 |
|
|
case 2: /* short, int */
|
937 |
|
|
regval = extract_address (valbuf, len);
|
938 |
|
|
write_register (0, regval);
|
939 |
|
|
break;
|
940 |
|
|
case 4: /* long, float */
|
941 |
|
|
regval = extract_address (valbuf, len);
|
942 |
|
|
write_register (0, regval >> 16);
|
943 |
|
|
write_register (1, regval & 0xffff);
|
944 |
|
|
break;
|
945 |
|
|
case 8: /* presumeably double, but doesn't seem to happen */
|
946 |
|
|
error ("I don't know how to return a double.");
|
947 |
|
|
break;
|
948 |
|
|
}
|
949 |
|
|
}
|
950 |
|
|
|
951 |
|
|
/* Setup the return address for a dummy frame, as called by
|
952 |
|
|
call_function_by_hand. Only necessary when you are using an empty
|
953 |
|
|
CALL_DUMMY. */
|
954 |
|
|
|
955 |
|
|
static CORE_ADDR
|
956 |
|
|
avr_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
|
957 |
|
|
{
|
958 |
|
|
unsigned char buf[2];
|
959 |
|
|
int wordsize = 2;
|
960 |
|
|
#if 0
|
961 |
|
|
struct minimal_symbol *msymbol;
|
962 |
|
|
CORE_ADDR mon_brk;
|
963 |
|
|
#endif
|
964 |
|
|
|
965 |
|
|
buf[0] = 0;
|
966 |
|
|
buf[1] = 0;
|
967 |
|
|
sp -= wordsize;
|
968 |
|
|
write_memory (sp + 1, buf, 2);
|
969 |
|
|
|
970 |
|
|
#if 0
|
971 |
|
|
/* FIXME: TRoth/2002-02-18: This should probably be removed since it's a
|
972 |
|
|
left-over from Denis' original patch which used avr-mon for the target
|
973 |
|
|
instead of the generic remote target. */
|
974 |
|
|
if ((strcmp (target_shortname, "avr-mon") == 0)
|
975 |
|
|
&& (msymbol = lookup_minimal_symbol ("gdb_break", NULL, NULL)))
|
976 |
|
|
{
|
977 |
|
|
mon_brk = SYMBOL_VALUE_ADDRESS (msymbol);
|
978 |
|
|
store_unsigned_integer (buf, wordsize, mon_brk / 2);
|
979 |
|
|
sp -= wordsize;
|
980 |
|
|
write_memory (sp + 1, buf + 1, 1);
|
981 |
|
|
write_memory (sp + 2, buf, 1);
|
982 |
|
|
}
|
983 |
|
|
#endif
|
984 |
|
|
return sp;
|
985 |
|
|
}
|
986 |
|
|
|
987 |
|
|
static CORE_ADDR
|
988 |
|
|
avr_skip_prologue (CORE_ADDR pc)
|
989 |
|
|
{
|
990 |
|
|
CORE_ADDR func_addr, func_end;
|
991 |
|
|
struct symtab_and_line sal;
|
992 |
|
|
|
993 |
|
|
/* See what the symbol table says */
|
994 |
|
|
|
995 |
|
|
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
|
996 |
|
|
{
|
997 |
|
|
sal = find_pc_line (func_addr, 0);
|
998 |
|
|
|
999 |
|
|
/* troth/2002-08-05: For some very simple functions, gcc doesn't
|
1000 |
|
|
generate a prologue and the sal.end ends up being the 2-byte ``ret''
|
1001 |
|
|
instruction at the end of the function, but func_end ends up being
|
1002 |
|
|
the address of the first instruction of the _next_ function. By
|
1003 |
|
|
adjusting func_end by 2 bytes, we can catch these functions and not
|
1004 |
|
|
return sal.end if it is the ``ret'' instruction. */
|
1005 |
|
|
|
1006 |
|
|
if (sal.line != 0 && sal.end < (func_end-2))
|
1007 |
|
|
return sal.end;
|
1008 |
|
|
}
|
1009 |
|
|
|
1010 |
|
|
/* Either we didn't find the start of this function (nothing we can do),
|
1011 |
|
|
or there's no line info, or the line after the prologue is after
|
1012 |
|
|
the end of the function (there probably isn't a prologue). */
|
1013 |
|
|
|
1014 |
|
|
return pc;
|
1015 |
|
|
}
|
1016 |
|
|
|
1017 |
|
|
static CORE_ADDR
|
1018 |
|
|
avr_frame_address (struct frame_info *fi)
|
1019 |
|
|
{
|
1020 |
|
|
return avr_make_saddr (fi->frame);
|
1021 |
|
|
}
|
1022 |
|
|
|
1023 |
|
|
/* Given a GDB frame, determine the address of the calling function's frame.
|
1024 |
|
|
This will be used to create a new GDB frame struct, and then
|
1025 |
|
|
INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
|
1026 |
|
|
|
1027 |
|
|
For us, the frame address is its stack pointer value, so we look up
|
1028 |
|
|
the function prologue to determine the caller's sp value, and return it. */
|
1029 |
|
|
|
1030 |
|
|
static CORE_ADDR
|
1031 |
|
|
avr_frame_chain (struct frame_info *frame)
|
1032 |
|
|
{
|
1033 |
|
|
if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
|
1034 |
|
|
{
|
1035 |
|
|
/* initialize the return_pc now */
|
1036 |
|
|
frame->extra_info->return_pc = generic_read_register_dummy (frame->pc,
|
1037 |
|
|
frame->
|
1038 |
|
|
frame,
|
1039 |
|
|
AVR_PC_REGNUM);
|
1040 |
|
|
return frame->frame;
|
1041 |
|
|
}
|
1042 |
|
|
return (frame->extra_info->is_main ? 0
|
1043 |
|
|
: frame->frame + frame->extra_info->framesize + 2 /* ret addr */ );
|
1044 |
|
|
}
|
1045 |
|
|
|
1046 |
|
|
/* Store the address of the place in which to copy the structure the
|
1047 |
|
|
subroutine will return. This is called from call_function.
|
1048 |
|
|
|
1049 |
|
|
We store structs through a pointer passed in the first Argument
|
1050 |
|
|
register. */
|
1051 |
|
|
|
1052 |
|
|
static void
|
1053 |
|
|
avr_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
|
1054 |
|
|
{
|
1055 |
|
|
write_register (0, addr);
|
1056 |
|
|
}
|
1057 |
|
|
|
1058 |
|
|
/* Extract from an array REGBUF containing the (raw) register state
|
1059 |
|
|
the address in which a function should return its structure value,
|
1060 |
|
|
as a CORE_ADDR (or an expression that can be used as one). */
|
1061 |
|
|
|
1062 |
|
|
static CORE_ADDR
|
1063 |
|
|
avr_extract_struct_value_address (char *regbuf)
|
1064 |
|
|
{
|
1065 |
|
|
return (extract_address ((regbuf) + REGISTER_BYTE (0),
|
1066 |
|
|
REGISTER_RAW_SIZE (0)) | AVR_SMEM_START);
|
1067 |
|
|
}
|
1068 |
|
|
|
1069 |
|
|
/* Setup the function arguments for calling a function in the inferior.
|
1070 |
|
|
|
1071 |
|
|
On the AVR architecture, there are 18 registers (R25 to R8) which are
|
1072 |
|
|
dedicated for passing function arguments. Up to the first 18 arguments
|
1073 |
|
|
(depending on size) may go into these registers. The rest go on the stack.
|
1074 |
|
|
|
1075 |
|
|
Arguments that are larger than WORDSIZE bytes will be split between two or
|
1076 |
|
|
more registers as available, but will NOT be split between a register and
|
1077 |
|
|
the stack.
|
1078 |
|
|
|
1079 |
|
|
An exceptional case exists for struct arguments (and possibly other
|
1080 |
|
|
aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but
|
1081 |
|
|
not a multiple of WORDSIZE bytes. In this case the argument is never split
|
1082 |
|
|
between the registers and the stack, but instead is copied in its entirety
|
1083 |
|
|
onto the stack, AND also copied into as many registers as there is room
|
1084 |
|
|
for. In other words, space in registers permitting, two copies of the same
|
1085 |
|
|
argument are passed in. As far as I can tell, only the one on the stack is
|
1086 |
|
|
used, although that may be a function of the level of compiler
|
1087 |
|
|
optimization. I suspect this is a compiler bug. Arguments of these odd
|
1088 |
|
|
sizes are left-justified within the word (as opposed to arguments smaller
|
1089 |
|
|
than WORDSIZE bytes, which are right-justified).
|
1090 |
|
|
|
1091 |
|
|
If the function is to return an aggregate type such as a struct, the caller
|
1092 |
|
|
must allocate space into which the callee will copy the return value. In
|
1093 |
|
|
this case, a pointer to the return value location is passed into the callee
|
1094 |
|
|
in register R0, which displaces one of the other arguments passed in via
|
1095 |
|
|
registers R0 to R2. */
|
1096 |
|
|
|
1097 |
|
|
static CORE_ADDR
|
1098 |
|
|
avr_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
|
1099 |
|
|
int struct_return, CORE_ADDR struct_addr)
|
1100 |
|
|
{
|
1101 |
|
|
int stack_alloc, stack_offset;
|
1102 |
|
|
int wordsize;
|
1103 |
|
|
int argreg;
|
1104 |
|
|
int argnum;
|
1105 |
|
|
struct type *type;
|
1106 |
|
|
CORE_ADDR regval;
|
1107 |
|
|
char *val;
|
1108 |
|
|
char valbuf[4];
|
1109 |
|
|
int len;
|
1110 |
|
|
|
1111 |
|
|
wordsize = 1;
|
1112 |
|
|
#if 0
|
1113 |
|
|
/* Now make sure there's space on the stack */
|
1114 |
|
|
for (argnum = 0, stack_alloc = 0; argnum < nargs; argnum++)
|
1115 |
|
|
stack_alloc += TYPE_LENGTH (VALUE_TYPE (args[argnum]));
|
1116 |
|
|
sp -= stack_alloc; /* make room on stack for args */
|
1117 |
|
|
/* we may over-allocate a little here, but that won't hurt anything */
|
1118 |
|
|
#endif
|
1119 |
|
|
argreg = 25;
|
1120 |
|
|
if (struct_return) /* "struct return" pointer takes up one argreg */
|
1121 |
|
|
{
|
1122 |
|
|
write_register (--argreg, struct_addr);
|
1123 |
|
|
}
|
1124 |
|
|
|
1125 |
|
|
/* Now load as many as possible of the first arguments into registers, and
|
1126 |
|
|
push the rest onto the stack. There are 3N bytes in three registers
|
1127 |
|
|
available. Loop thru args from first to last. */
|
1128 |
|
|
|
1129 |
|
|
for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
|
1130 |
|
|
{
|
1131 |
|
|
type = VALUE_TYPE (args[argnum]);
|
1132 |
|
|
len = TYPE_LENGTH (type);
|
1133 |
|
|
val = (char *) VALUE_CONTENTS (args[argnum]);
|
1134 |
|
|
|
1135 |
|
|
/* NOTE WELL!!!!! This is not an "else if" clause!!! That's because
|
1136 |
|
|
some *&^%$ things get passed on the stack AND in the registers! */
|
1137 |
|
|
while (len > 0)
|
1138 |
|
|
{ /* there's room in registers */
|
1139 |
|
|
len -= wordsize;
|
1140 |
|
|
regval = extract_address (val + len, wordsize);
|
1141 |
|
|
write_register (argreg--, regval);
|
1142 |
|
|
}
|
1143 |
|
|
}
|
1144 |
|
|
return sp;
|
1145 |
|
|
}
|
1146 |
|
|
|
1147 |
|
|
/* Initialize the gdbarch structure for the AVR's. */
|
1148 |
|
|
|
1149 |
|
|
static struct gdbarch *
|
1150 |
|
|
avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
|
1151 |
|
|
{
|
1152 |
|
|
/* FIXME: TRoth/2002-02-18: I have no idea if avr_call_dummy_words[] should
|
1153 |
|
|
be bigger or not. Initial testing seems to show that `call my_func()`
|
1154 |
|
|
works and backtrace from a breakpoint within the call looks correct.
|
1155 |
|
|
Admittedly, I haven't tested with more than a very simple program. */
|
1156 |
|
|
static LONGEST avr_call_dummy_words[] = { 0 };
|
1157 |
|
|
|
1158 |
|
|
struct gdbarch *gdbarch;
|
1159 |
|
|
struct gdbarch_tdep *tdep;
|
1160 |
|
|
|
1161 |
|
|
/* Find a candidate among the list of pre-declared architectures. */
|
1162 |
|
|
arches = gdbarch_list_lookup_by_info (arches, &info);
|
1163 |
|
|
if (arches != NULL)
|
1164 |
|
|
return arches->gdbarch;
|
1165 |
|
|
|
1166 |
|
|
/* None found, create a new architecture from the information provided. */
|
1167 |
|
|
tdep = XMALLOC (struct gdbarch_tdep);
|
1168 |
|
|
gdbarch = gdbarch_alloc (&info, tdep);
|
1169 |
|
|
|
1170 |
|
|
/* If we ever need to differentiate the device types, do it here. */
|
1171 |
|
|
switch (info.bfd_arch_info->mach)
|
1172 |
|
|
{
|
1173 |
|
|
case bfd_mach_avr1:
|
1174 |
|
|
case bfd_mach_avr2:
|
1175 |
|
|
case bfd_mach_avr3:
|
1176 |
|
|
case bfd_mach_avr4:
|
1177 |
|
|
case bfd_mach_avr5:
|
1178 |
|
|
break;
|
1179 |
|
|
}
|
1180 |
|
|
|
1181 |
|
|
set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
|
1182 |
|
|
set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT);
|
1183 |
|
|
set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
|
1184 |
|
|
set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
|
1185 |
|
|
set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT);
|
1186 |
|
|
set_gdbarch_addr_bit (gdbarch, 32);
|
1187 |
|
|
set_gdbarch_bfd_vma_bit (gdbarch, 32); /* FIXME: TRoth/2002-02-18: Is this needed? */
|
1188 |
|
|
|
1189 |
|
|
set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
|
1190 |
|
|
set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
|
1191 |
|
|
set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT);
|
1192 |
|
|
|
1193 |
|
|
set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_little);
|
1194 |
|
|
set_gdbarch_double_format (gdbarch, &floatformat_ieee_single_little);
|
1195 |
|
|
set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_single_little);
|
1196 |
|
|
|
1197 |
|
|
set_gdbarch_read_pc (gdbarch, avr_read_pc);
|
1198 |
|
|
set_gdbarch_write_pc (gdbarch, avr_write_pc);
|
1199 |
|
|
set_gdbarch_read_fp (gdbarch, avr_read_fp);
|
1200 |
|
|
set_gdbarch_read_sp (gdbarch, avr_read_sp);
|
1201 |
|
|
set_gdbarch_write_sp (gdbarch, avr_write_sp);
|
1202 |
|
|
|
1203 |
|
|
set_gdbarch_num_regs (gdbarch, AVR_NUM_REGS);
|
1204 |
|
|
|
1205 |
|
|
set_gdbarch_sp_regnum (gdbarch, AVR_SP_REGNUM);
|
1206 |
|
|
set_gdbarch_fp_regnum (gdbarch, AVR_FP_REGNUM);
|
1207 |
|
|
set_gdbarch_pc_regnum (gdbarch, AVR_PC_REGNUM);
|
1208 |
|
|
|
1209 |
|
|
set_gdbarch_register_name (gdbarch, avr_register_name);
|
1210 |
|
|
set_gdbarch_register_size (gdbarch, 1);
|
1211 |
|
|
set_gdbarch_register_bytes (gdbarch, AVR_NUM_REG_BYTES);
|
1212 |
|
|
set_gdbarch_register_byte (gdbarch, avr_register_byte);
|
1213 |
|
|
set_gdbarch_register_raw_size (gdbarch, avr_register_raw_size);
|
1214 |
|
|
set_gdbarch_max_register_raw_size (gdbarch, 4);
|
1215 |
|
|
set_gdbarch_register_virtual_size (gdbarch, avr_register_virtual_size);
|
1216 |
|
|
set_gdbarch_max_register_virtual_size (gdbarch, 4);
|
1217 |
|
|
set_gdbarch_register_virtual_type (gdbarch, avr_register_virtual_type);
|
1218 |
|
|
|
1219 |
|
|
set_gdbarch_get_saved_register (gdbarch, generic_unwind_get_saved_register);
|
1220 |
|
|
|
1221 |
|
|
set_gdbarch_print_insn (gdbarch, print_insn_avr);
|
1222 |
|
|
|
1223 |
|
|
set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
|
1224 |
|
|
set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
|
1225 |
|
|
set_gdbarch_call_dummy_address (gdbarch, avr_call_dummy_address);
|
1226 |
|
|
set_gdbarch_call_dummy_start_offset (gdbarch, 0);
|
1227 |
|
|
set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
|
1228 |
|
|
set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
|
1229 |
|
|
set_gdbarch_call_dummy_length (gdbarch, 0);
|
1230 |
|
|
set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy);
|
1231 |
|
|
set_gdbarch_call_dummy_p (gdbarch, 1);
|
1232 |
|
|
set_gdbarch_call_dummy_words (gdbarch, avr_call_dummy_words);
|
1233 |
|
|
set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
|
1234 |
|
|
set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
|
1235 |
|
|
|
1236 |
|
|
/* set_gdbarch_believe_pcc_promotion (gdbarch, 1); // TRoth: should this be set? */
|
1237 |
|
|
|
1238 |
|
|
set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer);
|
1239 |
|
|
set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address);
|
1240 |
|
|
set_gdbarch_deprecated_extract_return_value (gdbarch, avr_extract_return_value);
|
1241 |
|
|
set_gdbarch_push_arguments (gdbarch, avr_push_arguments);
|
1242 |
|
|
set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
|
1243 |
|
|
set_gdbarch_push_return_address (gdbarch, avr_push_return_address);
|
1244 |
|
|
set_gdbarch_pop_frame (gdbarch, avr_pop_frame);
|
1245 |
|
|
|
1246 |
|
|
set_gdbarch_deprecated_store_return_value (gdbarch, avr_store_return_value);
|
1247 |
|
|
|
1248 |
|
|
set_gdbarch_use_struct_convention (gdbarch, generic_use_struct_convention);
|
1249 |
|
|
set_gdbarch_store_struct_return (gdbarch, avr_store_struct_return);
|
1250 |
|
|
set_gdbarch_deprecated_extract_struct_value_address
|
1251 |
|
|
(gdbarch, avr_extract_struct_value_address);
|
1252 |
|
|
|
1253 |
|
|
set_gdbarch_frame_init_saved_regs (gdbarch, avr_scan_prologue);
|
1254 |
|
|
set_gdbarch_init_extra_frame_info (gdbarch, avr_init_extra_frame_info);
|
1255 |
|
|
set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue);
|
1256 |
|
|
/* set_gdbarch_prologue_frameless_p (gdbarch, avr_prologue_frameless_p); */
|
1257 |
|
|
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
|
1258 |
|
|
|
1259 |
|
|
set_gdbarch_decr_pc_after_break (gdbarch, 0);
|
1260 |
|
|
|
1261 |
|
|
set_gdbarch_function_start_offset (gdbarch, 0);
|
1262 |
|
|
set_gdbarch_remote_translate_xfer_address (gdbarch,
|
1263 |
|
|
avr_remote_translate_xfer_address);
|
1264 |
|
|
set_gdbarch_frame_args_skip (gdbarch, 0);
|
1265 |
|
|
set_gdbarch_frameless_function_invocation (gdbarch, frameless_look_for_prologue); /* ??? */
|
1266 |
|
|
set_gdbarch_frame_chain (gdbarch, avr_frame_chain);
|
1267 |
|
|
set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid);
|
1268 |
|
|
set_gdbarch_frame_saved_pc (gdbarch, avr_frame_saved_pc);
|
1269 |
|
|
set_gdbarch_frame_args_address (gdbarch, avr_frame_address);
|
1270 |
|
|
set_gdbarch_frame_locals_address (gdbarch, avr_frame_address);
|
1271 |
|
|
set_gdbarch_saved_pc_after_call (gdbarch, avr_saved_pc_after_call);
|
1272 |
|
|
set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
|
1273 |
|
|
|
1274 |
|
|
set_gdbarch_convert_from_func_ptr_addr (gdbarch,
|
1275 |
|
|
avr_convert_from_func_ptr_addr);
|
1276 |
|
|
|
1277 |
|
|
return gdbarch;
|
1278 |
|
|
}
|
1279 |
|
|
|
1280 |
|
|
/* Send a query request to the avr remote target asking for values of the io
|
1281 |
|
|
registers. If args parameter is not NULL, then the user has requested info
|
1282 |
|
|
on a specific io register [This still needs implemented and is ignored for
|
1283 |
|
|
now]. The query string should be one of these forms:
|
1284 |
|
|
|
1285 |
|
|
"Ravr.io_reg" -> reply is "NN" number of io registers
|
1286 |
|
|
|
1287 |
|
|
"Ravr.io_reg:addr,len" where addr is first register and len is number of
|
1288 |
|
|
registers to be read. The reply should be "<NAME>,VV;" for each io register
|
1289 |
|
|
where, <NAME> is a string, and VV is the hex value of the register.
|
1290 |
|
|
|
1291 |
|
|
All io registers are 8-bit. */
|
1292 |
|
|
|
1293 |
|
|
static void
|
1294 |
|
|
avr_io_reg_read_command (char *args, int from_tty)
|
1295 |
|
|
{
|
1296 |
|
|
int bufsiz = 0;
|
1297 |
|
|
char buf[400];
|
1298 |
|
|
char query[400];
|
1299 |
|
|
char *p;
|
1300 |
|
|
unsigned int nreg = 0;
|
1301 |
|
|
unsigned int val;
|
1302 |
|
|
int i, j, k, step;
|
1303 |
|
|
|
1304 |
|
|
/* fprintf_unfiltered (gdb_stderr, "DEBUG: avr_io_reg_read_command (\"%s\", %d)\n", */
|
1305 |
|
|
/* args, from_tty); */
|
1306 |
|
|
|
1307 |
|
|
if (!current_target.to_query)
|
1308 |
|
|
{
|
1309 |
|
|
fprintf_unfiltered (gdb_stderr,
|
1310 |
|
|
"ERR: info io_registers NOT supported by current target\n");
|
1311 |
|
|
return;
|
1312 |
|
|
}
|
1313 |
|
|
|
1314 |
|
|
/* Just get the maximum buffer size. */
|
1315 |
|
|
target_query ((int) 'R', 0, 0, &bufsiz);
|
1316 |
|
|
if (bufsiz > sizeof (buf))
|
1317 |
|
|
bufsiz = sizeof (buf);
|
1318 |
|
|
|
1319 |
|
|
/* Find out how many io registers the target has. */
|
1320 |
|
|
strcpy (query, "avr.io_reg");
|
1321 |
|
|
target_query ((int) 'R', query, buf, &bufsiz);
|
1322 |
|
|
|
1323 |
|
|
if (strncmp (buf, "", bufsiz) == 0)
|
1324 |
|
|
{
|
1325 |
|
|
fprintf_unfiltered (gdb_stderr,
|
1326 |
|
|
"info io_registers NOT supported by target\n");
|
1327 |
|
|
return;
|
1328 |
|
|
}
|
1329 |
|
|
|
1330 |
|
|
if (sscanf (buf, "%x", &nreg) != 1)
|
1331 |
|
|
{
|
1332 |
|
|
fprintf_unfiltered (gdb_stderr,
|
1333 |
|
|
"Error fetching number of io registers\n");
|
1334 |
|
|
return;
|
1335 |
|
|
}
|
1336 |
|
|
|
1337 |
|
|
reinitialize_more_filter ();
|
1338 |
|
|
|
1339 |
|
|
printf_unfiltered ("Target has %u io registers:\n\n", nreg);
|
1340 |
|
|
|
1341 |
|
|
/* only fetch up to 8 registers at a time to keep the buffer small */
|
1342 |
|
|
step = 8;
|
1343 |
|
|
|
1344 |
|
|
for (i = 0; i < nreg; i += step)
|
1345 |
|
|
{
|
1346 |
|
|
j = step - (nreg % step); /* how many registers this round? */
|
1347 |
|
|
|
1348 |
|
|
snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j);
|
1349 |
|
|
target_query ((int) 'R', query, buf, &bufsiz);
|
1350 |
|
|
|
1351 |
|
|
p = buf;
|
1352 |
|
|
for (k = i; k < (i + j); k++)
|
1353 |
|
|
{
|
1354 |
|
|
if (sscanf (p, "%[^,],%x;", query, &val) == 2)
|
1355 |
|
|
{
|
1356 |
|
|
printf_filtered ("[%02x] %-15s : %02x\n", k, query, val);
|
1357 |
|
|
while ((*p != ';') && (*p != '\0'))
|
1358 |
|
|
p++;
|
1359 |
|
|
p++; /* skip over ';' */
|
1360 |
|
|
if (*p == '\0')
|
1361 |
|
|
break;
|
1362 |
|
|
}
|
1363 |
|
|
}
|
1364 |
|
|
}
|
1365 |
|
|
}
|
1366 |
|
|
|
1367 |
|
|
void
|
1368 |
|
|
_initialize_avr_tdep (void)
|
1369 |
|
|
{
|
1370 |
|
|
register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init);
|
1371 |
|
|
|
1372 |
|
|
/* Add a new command to allow the user to query the avr remote target for
|
1373 |
|
|
the values of the io space registers in a saner way than just using
|
1374 |
|
|
`x/NNNb ADDR`. */
|
1375 |
|
|
|
1376 |
|
|
/* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr
|
1377 |
|
|
io_registers' to signify it is not available on other platforms. */
|
1378 |
|
|
|
1379 |
|
|
add_cmd ("io_registers", class_info, avr_io_reg_read_command,
|
1380 |
|
|
"query remote avr target for io space register values", &infolist);
|
1381 |
|
|
}
|