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1856 lines
37 KiB
C
1856 lines
37 KiB
C
/* Simulator for Atmel's AVR core.
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Copyright (C) 2009 Free Software Foundation, Inc.
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Written by Tristan Gingold, AdaCore.
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This file is part of GDB, the GNU debugger.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "config.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "bfd.h"
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#include "gdb/callback.h"
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#include "gdb/signals.h"
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#include "libiberty.h"
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#include "gdb/remote-sim.h"
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#include "dis-asm.h"
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#include "sim-utils.h"
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/* As AVR is a 8/16 bits processor, define handy types. */
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typedef unsigned short int word;
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typedef signed short int sword;
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typedef unsigned char byte;
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typedef signed char sbyte;
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/* Debug flag to display instructions and registers. */
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static int tracing = 0;
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static int lock_step = 0;
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static int verbose;
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/* The only real register. */
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static unsigned int pc;
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/* We update a cycle counter. */
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static unsigned int cycles = 0;
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/* If true, the pc needs more than 2 bytes. */
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static int avr_pc22;
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static struct bfd *cur_bfd;
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static enum sim_stop cpu_exception;
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static int cpu_signal;
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static SIM_OPEN_KIND sim_kind;
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static char *myname;
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static host_callback *callback;
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/* Max size of I space (which is always flash on avr). */
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#define MAX_AVR_FLASH (128 * 1024)
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#define PC_MASK (MAX_AVR_FLASH - 1)
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/* Mac size of D space. */
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#define MAX_AVR_SRAM (64 * 1024)
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#define SRAM_MASK (MAX_AVR_SRAM - 1)
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/* D space offset in ELF file. */
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#define SRAM_VADDR 0x800000
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/* Simulator specific ports. */
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#define STDIO_PORT 0x52
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#define EXIT_PORT 0x4F
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#define ABORT_PORT 0x49
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/* GDB defined register numbers. */
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#define AVR_SREG_REGNUM 32
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#define AVR_SP_REGNUM 33
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#define AVR_PC_REGNUM 34
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/* Memory mapped registers. */
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#define SREG 0x5F
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#define REG_SP 0x5D
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#define EIND 0x5C
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#define RAMPZ 0x5B
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#define REGX 0x1a
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#define REGY 0x1c
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#define REGZ 0x1e
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#define REGZ_LO 0x1e
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#define REGZ_HI 0x1f
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/* Sreg (status) bits. */
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#define SREG_I 0x80
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#define SREG_T 0x40
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#define SREG_H 0x20
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#define SREG_S 0x10
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#define SREG_V 0x08
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#define SREG_N 0x04
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#define SREG_Z 0x02
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#define SREG_C 0x01
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/* In order to speed up emulation we use a simple approach:
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a code is associated with each instruction. The pre-decoding occurs
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usually once when the instruction is first seen.
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This works well because I&D spaces are separated.
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Missing opcodes: sleep, spm, wdr (as they are mmcu dependent).
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*/
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enum avr_opcode
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{
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/* Opcode not yet decoded. */
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OP_unknown,
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OP_bad,
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OP_nop,
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OP_rjmp,
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OP_rcall,
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OP_ret,
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OP_reti,
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OP_break,
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OP_brbs,
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OP_brbc,
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OP_bset,
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OP_bclr,
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OP_bld,
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OP_bst,
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OP_sbrc,
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OP_sbrs,
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OP_eor,
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OP_and,
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OP_andi,
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OP_or,
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OP_ori,
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OP_com,
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OP_swap,
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OP_neg,
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OP_out,
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OP_in,
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OP_cbi,
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OP_sbi,
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OP_sbic,
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OP_sbis,
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OP_ldi,
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OP_cpse,
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OP_cp,
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OP_cpi,
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OP_cpc,
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OP_sub,
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OP_sbc,
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OP_sbiw,
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OP_adiw,
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OP_add,
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OP_adc,
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OP_subi,
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OP_sbci,
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OP_inc,
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OP_dec,
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OP_lsr,
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OP_ror,
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OP_asr,
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OP_mul,
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OP_muls,
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OP_mulsu,
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OP_fmul,
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OP_fmuls,
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OP_fmulsu,
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OP_mov,
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OP_movw,
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OP_push,
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OP_pop,
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OP_st_X,
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OP_st_dec_X,
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OP_st_X_inc,
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OP_st_Y_inc,
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OP_st_dec_Y,
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OP_st_Z_inc,
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OP_st_dec_Z,
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OP_std_Y,
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OP_std_Z,
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OP_ldd_Y,
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OP_ldd_Z,
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OP_ld_Z_inc,
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OP_ld_dec_Z,
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OP_ld_Y_inc,
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OP_ld_dec_Y,
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OP_ld_X,
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OP_ld_X_inc,
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OP_ld_dec_X,
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OP_lpm,
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OP_lpm_Z,
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OP_lpm_inc_Z,
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OP_elpm,
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OP_elpm_Z,
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OP_elpm_inc_Z,
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OP_ijmp,
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OP_icall,
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OP_eijmp,
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OP_eicall,
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/* 2 words opcodes. */
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#define OP_2words OP_jmp
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OP_jmp,
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OP_call,
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OP_sts,
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OP_lds
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};
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struct avr_insn_cell
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{
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/* The insn (16 bits). */
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word op;
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/* Pre-decoding code. */
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enum avr_opcode code : 8;
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/* One byte of additional information. */
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byte r;
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};
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/* I&D memories. */
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static struct avr_insn_cell flash[MAX_AVR_FLASH];
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static byte sram[MAX_AVR_SRAM];
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void
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sim_size (int s)
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{
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}
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/* Sign extend a value. */
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static int sign_ext (word val, int nb_bits)
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{
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if (val & (1 << (nb_bits - 1)))
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return val | (-1 << nb_bits);
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return val;
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}
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/* Insn field extractors. */
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/* Extract xxxx_xxxRx_xxxx_RRRR. */
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static inline byte get_r (word op)
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{
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return (op & 0xf) | ((op >> 5) & 0x10);
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}
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/* Extract xxxx_xxxxx_xxxx_RRRR. */
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static inline byte get_r16 (word op)
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{
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return 16 + (op & 0xf);
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}
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/* Extract xxxx_xxxxx_xxxx_xRRR. */
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static inline byte get_r16_23 (word op)
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{
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return 16 + (op & 0x7);
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}
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/* Extract xxxx_xxxD_DDDD_xxxx. */
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static inline byte get_d (word op)
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{
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return (op >> 4) & 0x1f;
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}
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/* Extract xxxx_xxxx_DDDD_xxxx. */
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static inline byte get_d16 (word op)
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{
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return 16 + ((op >> 4) & 0x0f);
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}
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/* Extract xxxx_xxxx_xDDD_xxxx. */
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static inline byte get_d16_23 (word op)
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{
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return 16 + ((op >> 4) & 0x07);
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}
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/* Extract xxxx_xAAx_xxxx_AAAA. */
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static inline byte get_A (word op)
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{
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return (op & 0x0f) | ((op & 0x600) >> 5);
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}
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/* Extract xxxx_xxxx_AAAA_Axxx. */
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static inline byte get_biA (word op)
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{
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return (op >> 3) & 0x1f;
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}
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/* Extract xxxx_KKKK_xxxx_KKKK. */
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static inline byte get_K (word op)
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{
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return (op & 0xf) | ((op & 0xf00) >> 4);
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}
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/* Extract xxxx_xxKK_KKKK_Kxxx. */
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static inline int get_k (word op)
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{
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return sign_ext ((op & 0x3f8) >> 3, 7);
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}
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/* Extract xxxx_xxxx_xxDD_xxxx. */
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static inline byte get_d24 (word op)
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{
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return 24 + ((op >> 3) & 6);
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}
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/* Extract xxxx_xxxx_KKxx_KKKK. */
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static inline byte get_k6 (word op)
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{
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return (op & 0xf) | ((op >> 2) & 0x30);
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}
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/* Extract xxQx_QQxx_xxxx_xQQQ. */
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static inline byte get_q (word op)
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{
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return (op & 7) | ((op >> 7) & 0x18)| ((op >> 8) & 0x20);
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}
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/* Extract xxxx_xxxx_xxxx_xBBB. */
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static inline byte get_b (word op)
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{
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return (op & 7);
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}
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/* AVR is little endian. */
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static inline word
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read_word (unsigned int addr)
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{
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return sram[addr] | (sram[addr + 1] << 8);
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}
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static inline void
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write_word (unsigned int addr, word w)
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{
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sram[addr] = w;
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sram[addr + 1] = w >> 8;
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}
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static inline word
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read_word_post_inc (unsigned int addr)
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{
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word v = read_word (addr);
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write_word (addr, v + 1);
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return v;
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}
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static inline word
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read_word_pre_dec (unsigned int addr)
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{
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word v = read_word (addr) - 1;
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write_word (addr, v);
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return v;
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}
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static void
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update_flags_logic (byte res)
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{
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sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z);
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if (res == 0)
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sram[SREG] |= SREG_Z;
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if (res & 0x80)
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sram[SREG] |= SREG_N | SREG_S;
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}
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static void
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update_flags_add (byte r, byte a, byte b)
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{
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byte carry;
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sram[SREG] &= ~(SREG_H | SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
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if (r & 0x80)
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sram[SREG] |= SREG_N;
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carry = (a & b) | (a & ~r) | (b & ~r);
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if (carry & 0x08)
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sram[SREG] |= SREG_H;
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if (carry & 0x80)
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sram[SREG] |= SREG_C;
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if (((a & b & ~r) | (~a & ~b & r)) & 0x80)
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sram[SREG] |= SREG_V;
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if (!(sram[SREG] & SREG_N) ^ !(sram[SREG] & SREG_V))
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sram[SREG] |= SREG_S;
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if (r == 0)
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sram[SREG] |= SREG_Z;
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}
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static void update_flags_sub (byte r, byte a, byte b)
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{
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byte carry;
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sram[SREG] &= ~(SREG_H | SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
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if (r & 0x80)
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sram[SREG] |= SREG_N;
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carry = (~a & b) | (b & r) | (r & ~a);
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if (carry & 0x08)
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sram[SREG] |= SREG_H;
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if (carry & 0x80)
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sram[SREG] |= SREG_C;
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if (((a & ~b & ~r) | (~a & b & r)) & 0x80)
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sram[SREG] |= SREG_V;
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if (!(sram[SREG] & SREG_N) ^ !(sram[SREG] & SREG_V))
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sram[SREG] |= SREG_S;
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/* Note: Z is not set. */
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}
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static enum avr_opcode
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decode (unsigned int pc)
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{
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word op1 = flash[pc].op;
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switch ((op1 >> 12) & 0x0f)
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{
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case 0x0:
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switch ((op1 >> 10) & 0x3)
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{
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case 0x0:
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switch ((op1 >> 8) & 0x3)
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{
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case 0x0:
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if (op1 == 0)
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return OP_nop;
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break;
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case 0x1:
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return OP_movw;
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case 0x2:
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return OP_muls;
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case 0x3:
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if (op1 & 0x80)
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{
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if (op1 & 0x08)
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return OP_fmulsu;
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else
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return OP_fmuls;
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}
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else
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{
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if (op1 & 0x08)
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return OP_fmul;
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else
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return OP_mulsu;
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}
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}
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break;
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case 0x1:
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return OP_cpc;
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case 0x2:
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flash[pc].r = SREG_C;
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return OP_sbc;
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case 0x3:
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flash[pc].r = 0;
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return OP_add;
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}
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break;
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case 0x1:
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switch ((op1 >> 10) & 0x3)
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{
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case 0x0:
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return OP_cpse;
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case 0x1:
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return OP_cp;
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case 0x2:
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flash[pc].r = 0;
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return OP_sub;
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case 0x3:
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flash[pc].r = SREG_C;
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return OP_adc;
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}
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break;
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case 0x2:
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switch ((op1 >> 10) & 0x3)
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{
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case 0x0:
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return OP_and;
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case 0x1:
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return OP_eor;
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case 0x2:
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return OP_or;
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case 0x3:
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return OP_mov;
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}
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break;
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case 0x3:
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return OP_cpi;
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case 0x4:
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return OP_sbci;
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case 0x5:
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return OP_subi;
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case 0x6:
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return OP_ori;
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case 0x7:
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return OP_andi;
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case 0x8:
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case 0xa:
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if (op1 & 0x0200)
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{
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if (op1 & 0x0008)
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{
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flash[pc].r = get_q (op1);
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return OP_std_Y;
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}
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else
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{
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flash[pc].r = get_q (op1);
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return OP_std_Z;
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}
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}
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else
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{
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if (op1 & 0x0008)
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{
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flash[pc].r = get_q (op1);
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return OP_ldd_Y;
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}
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else
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{
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flash[pc].r = get_q (op1);
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return OP_ldd_Z;
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}
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}
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break;
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case 0x9: /* 9xxx */
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switch ((op1 >> 8) & 0xf)
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{
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case 0x0:
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case 0x1:
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switch ((op1 >> 0) & 0xf)
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{
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case 0x0:
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return OP_lds;
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case 0x1:
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return OP_ld_Z_inc;
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case 0x2:
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return OP_ld_dec_Z;
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case 0x4:
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return OP_lpm_Z;
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case 0x5:
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return OP_lpm_inc_Z;
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case 0x6:
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return OP_elpm_Z;
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case 0x7:
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return OP_elpm_inc_Z;
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case 0x9:
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return OP_ld_Y_inc;
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case 0xa:
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return OP_ld_dec_Y;
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case 0xc:
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return OP_ld_X;
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case 0xd:
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return OP_ld_X_inc;
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case 0xe:
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return OP_ld_dec_X;
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case 0xf:
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return OP_pop;
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}
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break;
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case 0x2:
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case 0x3:
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switch ((op1 >> 0) & 0xf)
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{
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case 0x0:
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return OP_sts;
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case 0x1:
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|
return OP_st_Z_inc;
|
|
case 0x2:
|
|
return OP_st_dec_Z;
|
|
case 0x9:
|
|
return OP_st_Y_inc;
|
|
case 0xa:
|
|
return OP_st_dec_Y;
|
|
case 0xc:
|
|
return OP_st_X;
|
|
case 0xd:
|
|
return OP_st_X_inc;
|
|
case 0xe:
|
|
return OP_st_dec_X;
|
|
case 0xf:
|
|
return OP_push;
|
|
}
|
|
break;
|
|
case 0x4:
|
|
case 0x5:
|
|
switch (op1 & 0xf)
|
|
{
|
|
case 0x0:
|
|
return OP_com;
|
|
case 0x1:
|
|
return OP_neg;
|
|
case 0x2:
|
|
return OP_swap;
|
|
case 0x3:
|
|
return OP_inc;
|
|
case 0x5:
|
|
flash[pc].r = 0x80;
|
|
return OP_asr;
|
|
case 0x6:
|
|
flash[pc].r = 0;
|
|
return OP_lsr;
|
|
case 0x7:
|
|
return OP_ror;
|
|
case 0x8: /* 9[45]x8 */
|
|
switch ((op1 >> 4) & 0x1f)
|
|
{
|
|
case 0x00:
|
|
case 0x01:
|
|
case 0x02:
|
|
case 0x03:
|
|
case 0x04:
|
|
case 0x05:
|
|
case 0x06:
|
|
case 0x07:
|
|
return OP_bset;
|
|
case 0x08:
|
|
case 0x09:
|
|
case 0x0a:
|
|
case 0x0b:
|
|
case 0x0c:
|
|
case 0x0d:
|
|
case 0x0e:
|
|
case 0x0f:
|
|
return OP_bclr;
|
|
case 0x10:
|
|
return OP_ret;
|
|
case 0x11:
|
|
return OP_reti;
|
|
case 0x19:
|
|
return OP_break;
|
|
case 0x1c:
|
|
return OP_lpm;
|
|
case 0x1d:
|
|
return OP_elpm;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case 0x9: /* 9[45]x9 */
|
|
switch ((op1 >> 4) & 0x1f)
|
|
{
|
|
case 0x00:
|
|
return OP_ijmp;
|
|
case 0x01:
|
|
return OP_eijmp;
|
|
case 0x10:
|
|
return OP_icall;
|
|
case 0x11:
|
|
return OP_eicall;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case 0xa:
|
|
return OP_dec;
|
|
case 0xc:
|
|
case 0xd:
|
|
flash[pc].r = ((op1 & 0x1f0) >> 3) | (op1 & 1);
|
|
return OP_jmp;
|
|
case 0xe:
|
|
case 0xf:
|
|
flash[pc].r = ((op1 & 0x1f0) >> 3) | (op1 & 1);
|
|
return OP_call;
|
|
}
|
|
break;
|
|
case 0x6:
|
|
return OP_adiw;
|
|
case 0x7:
|
|
return OP_sbiw;
|
|
case 0x8:
|
|
return OP_cbi;
|
|
case 0x9:
|
|
return OP_sbic;
|
|
case 0xa:
|
|
return OP_sbi;
|
|
case 0xb:
|
|
return OP_sbis;
|
|
case 0xc:
|
|
case 0xd:
|
|
case 0xe:
|
|
case 0xf:
|
|
return OP_mul;
|
|
}
|
|
break;
|
|
case 0xb:
|
|
flash[pc].r = get_A (op1);
|
|
if (((op1 >> 11) & 1) == 0)
|
|
return OP_in;
|
|
else
|
|
return OP_out;
|
|
case 0xc:
|
|
return OP_rjmp;
|
|
case 0xd:
|
|
return OP_rcall;
|
|
case 0xe:
|
|
return OP_ldi;
|
|
case 0xf:
|
|
switch ((op1 >> 9) & 7)
|
|
{
|
|
case 0:
|
|
case 1:
|
|
flash[pc].r = 1 << (op1 & 7);
|
|
return OP_brbs;
|
|
case 2:
|
|
case 3:
|
|
flash[pc].r = 1 << (op1 & 7);
|
|
return OP_brbc;
|
|
case 4:
|
|
if ((op1 & 8) == 0)
|
|
{
|
|
flash[pc].r = 1 << (op1 & 7);
|
|
return OP_bld;
|
|
}
|
|
break;
|
|
case 5:
|
|
if ((op1 & 8) == 0)
|
|
{
|
|
flash[pc].r = 1 << (op1 & 7);
|
|
return OP_bst;
|
|
}
|
|
break;
|
|
case 6:
|
|
if ((op1 & 8) == 0)
|
|
{
|
|
flash[pc].r = 1 << (op1 & 7);
|
|
return OP_sbrc;
|
|
}
|
|
break;
|
|
case 7:
|
|
if ((op1 & 8) == 0)
|
|
{
|
|
flash[pc].r = 1 << (op1 & 7);
|
|
return OP_sbrs;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
sim_cb_eprintf (callback,
|
|
"Unhandled instruction at pc=0x%x, op=%04x\n", pc * 2, op1);
|
|
return OP_bad;
|
|
}
|
|
|
|
/* Disassemble an instruction. */
|
|
|
|
static int
|
|
disasm_read_memory (bfd_vma memaddr, bfd_byte *myaddr, unsigned int length,
|
|
struct disassemble_info *info)
|
|
{
|
|
int res;
|
|
|
|
res = sim_read (NULL, memaddr, myaddr, length);
|
|
if (res != length)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/* Memory error support for an opcodes disassembler. */
|
|
|
|
static void
|
|
disasm_perror_memory (int status, bfd_vma memaddr,
|
|
struct disassemble_info *info)
|
|
{
|
|
if (status != -1)
|
|
/* Can't happen. */
|
|
info->fprintf_func (info->stream, "Unknown error %d.", status);
|
|
else
|
|
/* Actually, address between memaddr and memaddr + len was
|
|
out of bounds. */
|
|
info->fprintf_func (info->stream,
|
|
"Address 0x%x is out of bounds.",
|
|
(int) memaddr);
|
|
}
|
|
|
|
static void
|
|
disassemble_insn (SIM_DESC sd, SIM_ADDR pc)
|
|
{
|
|
struct disassemble_info disasm_info;
|
|
int len;
|
|
int i;
|
|
|
|
INIT_DISASSEMBLE_INFO (disasm_info, callback, sim_cb_eprintf);
|
|
|
|
disasm_info.arch = bfd_get_arch (cur_bfd);
|
|
disasm_info.mach = bfd_get_mach (cur_bfd);
|
|
disasm_info.endian = BFD_ENDIAN_LITTLE;
|
|
disasm_info.read_memory_func = disasm_read_memory;
|
|
disasm_info.memory_error_func = disasm_perror_memory;
|
|
|
|
len = print_insn_avr (pc << 1, &disasm_info);
|
|
len = len / 2;
|
|
for (i = 0; i < len; i++)
|
|
sim_cb_eprintf (callback, " %04x", flash[pc + i].op);
|
|
}
|
|
|
|
static void
|
|
do_call (unsigned int npc)
|
|
{
|
|
unsigned int sp = read_word (REG_SP);
|
|
|
|
/* Big endian! */
|
|
sram[sp--] = pc;
|
|
sram[sp--] = pc >> 8;
|
|
if (avr_pc22)
|
|
{
|
|
sram[sp--] = pc >> 16;
|
|
cycles++;
|
|
}
|
|
write_word (REG_SP, sp);
|
|
pc = npc & PC_MASK;
|
|
cycles += 3;
|
|
}
|
|
|
|
static int
|
|
get_insn_length (unsigned int p)
|
|
{
|
|
if (flash[p].code == OP_unknown)
|
|
flash[p].code = decode(p);
|
|
if (flash[p].code >= OP_2words)
|
|
return 2;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int
|
|
get_z (void)
|
|
{
|
|
return (sram[RAMPZ] << 16) | (sram[REGZ_HI] << 8) | sram[REGZ_LO];
|
|
}
|
|
|
|
static unsigned char
|
|
get_lpm (unsigned int addr)
|
|
{
|
|
word w;
|
|
|
|
w = flash[(addr >> 1) & PC_MASK].op;
|
|
if (addr & 1)
|
|
w >>= 8;
|
|
return w;
|
|
}
|
|
|
|
static void
|
|
gen_mul (unsigned int res)
|
|
{
|
|
write_word (0, res);
|
|
sram[SREG] &= ~(SREG_Z | SREG_C);
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
if (res & 0x8000)
|
|
sram[SREG] |= SREG_C;
|
|
cycles++;
|
|
}
|
|
|
|
void
|
|
sim_resume (SIM_DESC sd, int step, int signal)
|
|
{
|
|
unsigned int ipc;
|
|
|
|
if (step)
|
|
{
|
|
cpu_exception = sim_stopped;
|
|
cpu_signal = TARGET_SIGNAL_TRAP;
|
|
}
|
|
else
|
|
cpu_exception = sim_running;
|
|
|
|
do
|
|
{
|
|
int code;
|
|
word op;
|
|
byte res;
|
|
byte r, d, vd;
|
|
|
|
again:
|
|
code = flash[pc].code;
|
|
op = flash[pc].op;
|
|
|
|
|
|
if ((tracing || lock_step) && code != OP_unknown)
|
|
{
|
|
if (verbose > 0) {
|
|
int flags;
|
|
int i;
|
|
|
|
sim_cb_eprintf (callback, "R00-07:");
|
|
for (i = 0; i < 8; i++)
|
|
sim_cb_eprintf (callback, " %02x", sram[i]);
|
|
sim_cb_eprintf (callback, " -");
|
|
for (i = 8; i < 16; i++)
|
|
sim_cb_eprintf (callback, " %02x", sram[i]);
|
|
sim_cb_eprintf (callback, " SP: %02x %02x",
|
|
sram[REG_SP + 1], sram[REG_SP]);
|
|
sim_cb_eprintf (callback, "\n");
|
|
sim_cb_eprintf (callback, "R16-31:");
|
|
for (i = 16; i < 24; i++)
|
|
sim_cb_eprintf (callback, " %02x", sram[i]);
|
|
sim_cb_eprintf (callback, " -");
|
|
for (i = 24; i < 32; i++)
|
|
sim_cb_eprintf (callback, " %02x", sram[i]);
|
|
sim_cb_eprintf (callback, " ");
|
|
flags = sram[SREG];
|
|
for (i = 0; i < 8; i++)
|
|
sim_cb_eprintf (callback, "%c",
|
|
flags & (0x80 >> i) ? "ITHSVNZC"[i] : '-');
|
|
sim_cb_eprintf (callback, "\n");
|
|
}
|
|
|
|
if (lock_step && !tracing)
|
|
sim_cb_eprintf (callback, "%06x: %04x\n", 2 * pc, flash[pc].op);
|
|
else
|
|
{
|
|
sim_cb_eprintf (callback, "pc=0x%06x insn=0x%04x code=%d r=%d\n",
|
|
2 * pc, flash[pc].op, code, flash[pc].r);
|
|
disassemble_insn (sd, pc);
|
|
sim_cb_eprintf (callback, "\n");
|
|
}
|
|
}
|
|
|
|
ipc = pc;
|
|
pc = (pc + 1) & PC_MASK;
|
|
cycles++;
|
|
|
|
switch (code)
|
|
{
|
|
case OP_unknown:
|
|
flash[ipc].code = decode(ipc);
|
|
pc = ipc;
|
|
cycles--;
|
|
goto again;
|
|
break;
|
|
|
|
case OP_nop:
|
|
break;
|
|
|
|
case OP_jmp:
|
|
/* 2 words instruction, but we don't care about the pc. */
|
|
pc = ((flash[ipc].r << 16) | flash[ipc + 1].op) & PC_MASK;
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_eijmp:
|
|
pc = ((sram[EIND] << 16) | read_word (REGZ)) & PC_MASK;
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_ijmp:
|
|
pc = read_word (REGZ) & PC_MASK;
|
|
cycles += 1;
|
|
break;
|
|
|
|
case OP_call:
|
|
/* 2 words instruction. */
|
|
pc++;
|
|
do_call ((flash[ipc].r << 16) | flash[ipc + 1].op);
|
|
break;
|
|
|
|
case OP_eicall:
|
|
do_call ((sram[EIND] << 16) | read_word (REGZ));
|
|
break;
|
|
|
|
case OP_icall:
|
|
do_call (read_word (REGZ));
|
|
break;
|
|
|
|
case OP_rcall:
|
|
do_call (pc + sign_ext (op & 0xfff, 12));
|
|
break;
|
|
|
|
case OP_reti:
|
|
sram[SREG] |= SREG_I;
|
|
/* Fall through */
|
|
case OP_ret:
|
|
{
|
|
unsigned int sp = read_word (REG_SP);
|
|
if (avr_pc22)
|
|
{
|
|
pc = sram[++sp] << 16;
|
|
cycles++;
|
|
}
|
|
else
|
|
pc = 0;
|
|
pc |= sram[++sp] << 8;
|
|
pc |= sram[++sp];
|
|
write_word (REG_SP, sp);
|
|
}
|
|
cycles += 3;
|
|
break;
|
|
|
|
case OP_break:
|
|
/* Stop on this address. */
|
|
cpu_exception = sim_stopped;
|
|
cpu_signal = TARGET_SIGNAL_TRAP;
|
|
pc = ipc;
|
|
break;
|
|
|
|
case OP_bld:
|
|
d = get_d (op);
|
|
r = flash[ipc].r;
|
|
if (sram[SREG] & SREG_T)
|
|
sram[d] |= r;
|
|
else
|
|
sram[d] &= ~r;
|
|
break;
|
|
|
|
case OP_bst:
|
|
if (sram[get_d (op)] & flash[ipc].r)
|
|
sram[SREG] |= SREG_T;
|
|
else
|
|
sram[SREG] &= ~SREG_T;
|
|
break;
|
|
|
|
case OP_sbrc:
|
|
case OP_sbrs:
|
|
if (((sram[get_d (op)] & flash[ipc].r) == 0) ^ ((op & 0x0200) != 0))
|
|
{
|
|
int l = get_insn_length(pc);
|
|
pc += l;
|
|
cycles += l;
|
|
}
|
|
break;
|
|
|
|
case OP_push:
|
|
{
|
|
unsigned int sp = read_word (REG_SP);
|
|
sram[sp--] = sram[get_d (op)];
|
|
write_word (REG_SP, sp);
|
|
}
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_pop:
|
|
{
|
|
unsigned int sp = read_word (REG_SP);
|
|
sram[get_d (op)] = sram[++sp];
|
|
write_word (REG_SP, sp);
|
|
}
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_bclr:
|
|
sram[SREG] &= ~(1 << ((op >> 4) & 0x7));
|
|
break;
|
|
|
|
case OP_bset:
|
|
sram[SREG] |= 1 << ((op >> 4) & 0x7);
|
|
break;
|
|
|
|
case OP_rjmp:
|
|
pc = (pc + sign_ext (op & 0xfff, 12)) & PC_MASK;
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_eor:
|
|
d = get_d (op);
|
|
res = sram[d] ^ sram[get_r (op)];
|
|
sram[d] = res;
|
|
update_flags_logic (res);
|
|
break;
|
|
|
|
case OP_and:
|
|
d = get_d (op);
|
|
res = sram[d] & sram[get_r (op)];
|
|
sram[d] = res;
|
|
update_flags_logic (res);
|
|
break;
|
|
|
|
case OP_andi:
|
|
d = get_d16 (op);
|
|
res = sram[d] & get_K (op);
|
|
sram[d] = res;
|
|
update_flags_logic (res);
|
|
break;
|
|
|
|
case OP_or:
|
|
d = get_d (op);
|
|
res = sram[d] | sram[get_r (op)];
|
|
sram[d] = res;
|
|
update_flags_logic (res);
|
|
break;
|
|
|
|
case OP_ori:
|
|
d = get_d16 (op);
|
|
res = sram[d] | get_K (op);
|
|
sram[d] = res;
|
|
update_flags_logic (res);
|
|
break;
|
|
|
|
case OP_com:
|
|
d = get_d (op);
|
|
res = ~sram[d];
|
|
sram[d] = res;
|
|
update_flags_logic (res);
|
|
sram[SREG] |= SREG_C;
|
|
break;
|
|
|
|
case OP_swap:
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
sram[d] = (vd >> 4) | (vd << 4);
|
|
break;
|
|
|
|
case OP_neg:
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
res = -vd;
|
|
sram[d] = res;
|
|
sram[SREG] &= ~(SREG_H | SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
else
|
|
sram[SREG] |= SREG_C;
|
|
if (res == 0x80)
|
|
sram[SREG] |= SREG_V | SREG_N;
|
|
else if (res & 0x80)
|
|
sram[SREG] |= SREG_N | SREG_S;
|
|
if ((res | vd) & 0x08)
|
|
sram[SREG] |= SREG_H;
|
|
break;
|
|
|
|
case OP_inc:
|
|
d = get_d (op);
|
|
res = sram[d] + 1;
|
|
sram[d] = res;
|
|
sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z);
|
|
if (res == 0x80)
|
|
sram[SREG] |= SREG_V | SREG_N;
|
|
else if (res & 0x80)
|
|
sram[SREG] |= SREG_N | SREG_S;
|
|
else if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_dec:
|
|
d = get_d (op);
|
|
res = sram[d] - 1;
|
|
sram[d] = res;
|
|
sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z);
|
|
if (res == 0x7f)
|
|
sram[SREG] |= SREG_V | SREG_S;
|
|
else if (res & 0x80)
|
|
sram[SREG] |= SREG_N | SREG_S;
|
|
else if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_lsr:
|
|
case OP_asr:
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
res = (vd >> 1) | (vd & flash[ipc].r);
|
|
sram[d] = res;
|
|
sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
|
|
if (vd & 1)
|
|
sram[SREG] |= SREG_C | SREG_S;
|
|
if (res & 0x80)
|
|
sram[SREG] |= SREG_N;
|
|
if (!(sram[SREG] & SREG_N) ^ !(sram[SREG] & SREG_C))
|
|
sram[SREG] |= SREG_V;
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_ror:
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
res = vd >> 1 | (sram[SREG] << 7);
|
|
sram[d] = res;
|
|
sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
|
|
if (vd & 1)
|
|
sram[SREG] |= SREG_C | SREG_S;
|
|
if (res & 0x80)
|
|
sram[SREG] |= SREG_N;
|
|
if (!(sram[SREG] & SREG_N) ^ !(sram[SREG] & SREG_C))
|
|
sram[SREG] |= SREG_V;
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_mul:
|
|
gen_mul ((word)sram[get_r (op)] * (word)sram[get_d (op)]);
|
|
break;
|
|
|
|
case OP_muls:
|
|
gen_mul((sword)(sbyte)sram[get_r16 (op)]
|
|
* (sword)(sbyte)sram[get_d16 (op)]);
|
|
break;
|
|
|
|
case OP_mulsu:
|
|
gen_mul ((sword)(word)sram[get_r16_23 (op)]
|
|
* (sword)(sbyte)sram[get_d16_23 (op)]);
|
|
break;
|
|
|
|
case OP_fmul:
|
|
gen_mul(((word)sram[get_r16_23 (op)]
|
|
* (word)sram[get_d16_23 (op)]) << 1);
|
|
break;
|
|
|
|
case OP_fmuls:
|
|
gen_mul(((sword)(sbyte)sram[get_r16_23 (op)]
|
|
* (sword)(sbyte)sram[get_d16_23 (op)]) << 1);
|
|
break;
|
|
|
|
case OP_fmulsu:
|
|
gen_mul(((sword)(word)sram[get_r16_23 (op)]
|
|
* (sword)(sbyte)sram[get_d16_23 (op)]) << 1);
|
|
break;
|
|
|
|
case OP_adc:
|
|
case OP_add:
|
|
r = sram[get_r (op)];
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
res = r + vd + (sram[SREG] & flash[ipc].r);
|
|
sram[d] = res;
|
|
update_flags_add (res, vd, r);
|
|
break;
|
|
|
|
case OP_sub:
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
r = sram[get_r (op)];
|
|
res = vd - r;
|
|
sram[d] = res;
|
|
update_flags_sub (res, vd, r);
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_sbc:
|
|
{
|
|
byte old = sram[SREG];
|
|
d = get_d (op);
|
|
vd = sram[d];
|
|
r = sram[get_r (op)];
|
|
res = vd - r - (old & SREG_C);
|
|
sram[d] = res;
|
|
update_flags_sub (res, vd, r);
|
|
if (res == 0 && (old & SREG_Z))
|
|
sram[SREG] |= SREG_Z;
|
|
}
|
|
break;
|
|
|
|
case OP_subi:
|
|
d = get_d16 (op);
|
|
vd = sram[d];
|
|
r = get_K (op);
|
|
res = vd - r;
|
|
sram[d] = res;
|
|
update_flags_sub (res, vd, r);
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_sbci:
|
|
{
|
|
byte old = sram[SREG];
|
|
|
|
d = get_d16 (op);
|
|
vd = sram[d];
|
|
r = get_K (op);
|
|
res = vd - r - (old & SREG_C);
|
|
sram[d] = res;
|
|
update_flags_sub (res, vd, r);
|
|
if (res == 0 && (old & SREG_Z))
|
|
sram[SREG] |= SREG_Z;
|
|
}
|
|
break;
|
|
|
|
case OP_mov:
|
|
sram[get_d (op)] = sram[get_r (op)];
|
|
break;
|
|
|
|
case OP_movw:
|
|
d = (op & 0xf0) >> 3;
|
|
r = (op & 0x0f) << 1;
|
|
sram[d] = sram[r];
|
|
sram[d + 1] = sram[r + 1];
|
|
break;
|
|
|
|
case OP_out:
|
|
d = get_A (op) + 0x20;
|
|
res = sram[get_d (op)];
|
|
sram[d] = res;
|
|
if (d == STDIO_PORT)
|
|
putchar (res);
|
|
else if (d == EXIT_PORT)
|
|
{
|
|
cpu_exception = sim_exited;
|
|
cpu_signal = 0;
|
|
return;
|
|
}
|
|
else if (d == ABORT_PORT)
|
|
{
|
|
cpu_exception = sim_exited;
|
|
cpu_signal = 1;
|
|
return;
|
|
}
|
|
break;
|
|
|
|
case OP_in:
|
|
d = get_A (op) + 0x20;
|
|
sram[get_d (op)] = sram[d];
|
|
break;
|
|
|
|
case OP_cbi:
|
|
d = get_biA (op) + 0x20;
|
|
sram[d] &= ~(1 << get_b(op));
|
|
break;
|
|
|
|
case OP_sbi:
|
|
d = get_biA (op) + 0x20;
|
|
sram[d] |= 1 << get_b(op);
|
|
break;
|
|
|
|
case OP_sbic:
|
|
if (!(sram[get_biA (op) + 0x20] & 1 << get_b(op)))
|
|
{
|
|
int l = get_insn_length(pc);
|
|
pc += l;
|
|
cycles += l;
|
|
}
|
|
break;
|
|
|
|
case OP_sbis:
|
|
if (sram[get_biA (op) + 0x20] & 1 << get_b(op))
|
|
{
|
|
int l = get_insn_length(pc);
|
|
pc += l;
|
|
cycles += l;
|
|
}
|
|
break;
|
|
|
|
case OP_ldi:
|
|
res = get_K (op);
|
|
d = get_d16 (op);
|
|
sram[d] = res;
|
|
break;
|
|
|
|
case OP_lds:
|
|
sram[get_d (op)] = sram[flash[pc].op];
|
|
pc++;
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_sts:
|
|
sram[flash[pc].op] = sram[get_d (op)];
|
|
pc++;
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_cpse:
|
|
if (sram[get_r (op)] == sram[get_d (op)])
|
|
{
|
|
int l = get_insn_length(pc);
|
|
pc += l;
|
|
cycles += l;
|
|
}
|
|
break;
|
|
|
|
case OP_cp:
|
|
r = sram[get_r (op)];
|
|
d = sram[get_d (op)];
|
|
res = d - r;
|
|
update_flags_sub (res, d, r);
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_cpi:
|
|
r = get_K (op);
|
|
d = sram[get_d16 (op)];
|
|
res = d - r;
|
|
update_flags_sub (res, d, r);
|
|
if (res == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
break;
|
|
|
|
case OP_cpc:
|
|
{
|
|
byte old = sram[SREG];
|
|
d = sram[get_d (op)];
|
|
r = sram[get_r (op)];
|
|
res = d - r - (old & SREG_C);
|
|
update_flags_sub (res, d, r);
|
|
if (res == 0 && (old & SREG_Z))
|
|
sram[SREG] |= SREG_Z;
|
|
}
|
|
break;
|
|
|
|
case OP_brbc:
|
|
if (!(sram[SREG] & flash[ipc].r))
|
|
{
|
|
pc = (pc + get_k (op)) & PC_MASK;
|
|
cycles++;
|
|
}
|
|
break;
|
|
|
|
case OP_brbs:
|
|
if (sram[SREG] & flash[ipc].r)
|
|
{
|
|
pc = (pc + get_k (op)) & PC_MASK;
|
|
cycles++;
|
|
}
|
|
break;
|
|
|
|
case OP_lpm:
|
|
sram[0] = get_lpm (read_word (REGZ));
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_lpm_Z:
|
|
sram[get_d (op)] = get_lpm (read_word (REGZ));
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_lpm_inc_Z:
|
|
sram[get_d (op)] = get_lpm (read_word_post_inc (REGZ));
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_elpm:
|
|
sram[0] = get_lpm (get_z ());
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_elpm_Z:
|
|
sram[get_d (op)] = get_lpm (get_z ());
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_elpm_inc_Z:
|
|
{
|
|
unsigned int z = get_z ();
|
|
|
|
sram[get_d (op)] = get_lpm (z);
|
|
z++;
|
|
sram[REGZ_LO] = z;
|
|
sram[REGZ_HI] = z >> 8;
|
|
sram[RAMPZ] = z >> 16;
|
|
}
|
|
cycles += 2;
|
|
break;
|
|
|
|
case OP_ld_Z_inc:
|
|
sram[get_d (op)] = sram[read_word_post_inc (REGZ) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ld_dec_Z:
|
|
sram[get_d (op)] = sram[read_word_pre_dec (REGZ) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ld_X_inc:
|
|
sram[get_d (op)] = sram[read_word_post_inc (REGX) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ld_dec_X:
|
|
sram[get_d (op)] = sram[read_word_pre_dec (REGX) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ld_Y_inc:
|
|
sram[get_d (op)] = sram[read_word_post_inc (REGY) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ld_dec_Y:
|
|
sram[get_d (op)] = sram[read_word_pre_dec (REGY) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_X:
|
|
sram[read_word (REGX) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_X_inc:
|
|
sram[read_word_post_inc (REGX) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_dec_X:
|
|
sram[read_word_pre_dec (REGX) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_Z_inc:
|
|
sram[read_word_post_inc (REGZ) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_dec_Z:
|
|
sram[read_word_pre_dec (REGZ) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_Y_inc:
|
|
sram[read_word_post_inc (REGY) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_st_dec_Y:
|
|
sram[read_word_pre_dec (REGY) & SRAM_MASK] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_std_Y:
|
|
sram[read_word (REGY) + flash[ipc].r] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_std_Z:
|
|
sram[read_word (REGZ) + flash[ipc].r] = sram[get_d (op)];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ldd_Z:
|
|
sram[get_d (op)] = sram[read_word (REGZ) + flash[ipc].r];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ldd_Y:
|
|
sram[get_d (op)] = sram[read_word (REGY) + flash[ipc].r];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_ld_X:
|
|
sram[get_d (op)] = sram[read_word (REGX) & SRAM_MASK];
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_sbiw:
|
|
{
|
|
word wk = get_k6 (op);
|
|
word wres;
|
|
word wr;
|
|
|
|
d = get_d24 (op);
|
|
wr = read_word (d);
|
|
wres = wr - wk;
|
|
|
|
sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
|
|
if (wres == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
if (wres & 0x8000)
|
|
sram[SREG] |= SREG_N;
|
|
if (wres & ~wr & 0x8000)
|
|
sram[SREG] |= SREG_C;
|
|
if (~wres & wr & 0x8000)
|
|
sram[SREG] |= SREG_V;
|
|
if (((~wres & wr) ^ wres) & 0x8000)
|
|
sram[SREG] |= SREG_S;
|
|
write_word (d, wres);
|
|
}
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_adiw:
|
|
{
|
|
word wk = get_k6 (op);
|
|
word wres;
|
|
word wr;
|
|
|
|
d = get_d24 (op);
|
|
wr = read_word (d);
|
|
wres = wr + wk;
|
|
|
|
sram[SREG] &= ~(SREG_S | SREG_V | SREG_N | SREG_Z | SREG_C);
|
|
if (wres == 0)
|
|
sram[SREG] |= SREG_Z;
|
|
if (wres & 0x8000)
|
|
sram[SREG] |= SREG_N;
|
|
if (~wres & wr & 0x8000)
|
|
sram[SREG] |= SREG_C;
|
|
if (wres & ~wr & 0x8000)
|
|
sram[SREG] |= SREG_V;
|
|
if (((wres & ~wr) ^ wres) & 0x8000)
|
|
sram[SREG] |= SREG_S;
|
|
write_word (d, wres);
|
|
}
|
|
cycles++;
|
|
break;
|
|
|
|
case OP_bad:
|
|
sim_cb_eprintf (callback, "Bad instruction at pc=0x%x\n", ipc * 2);
|
|
return;
|
|
|
|
default:
|
|
sim_cb_eprintf (callback,
|
|
"Unhandled instruction at pc=0x%x, code=%d\n",
|
|
2 * ipc, code);
|
|
return;
|
|
}
|
|
}
|
|
while (cpu_exception == sim_running);
|
|
}
|
|
|
|
|
|
int
|
|
sim_trace (SIM_DESC sd)
|
|
{
|
|
tracing = 1;
|
|
|
|
sim_resume (sd, 0, 0);
|
|
|
|
tracing = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
sim_write (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size)
|
|
{
|
|
int osize = size;
|
|
|
|
if (addr >= 0 && addr < SRAM_VADDR)
|
|
{
|
|
while (size > 0 && addr < (MAX_AVR_FLASH << 1))
|
|
{
|
|
word val = flash[addr >> 1].op;
|
|
|
|
if (addr & 1)
|
|
val = (val & 0xff) | (buffer[0] << 8);
|
|
else
|
|
val = (val & 0xff00) | buffer[0];
|
|
|
|
flash[addr >> 1].op = val;
|
|
flash[addr >> 1].code = OP_unknown;
|
|
addr++;
|
|
buffer++;
|
|
size--;
|
|
}
|
|
return osize - size;
|
|
}
|
|
else if (addr >= SRAM_VADDR && addr < SRAM_VADDR + MAX_AVR_SRAM)
|
|
{
|
|
addr -= SRAM_VADDR;
|
|
if (addr + size > MAX_AVR_SRAM)
|
|
size = MAX_AVR_SRAM - addr;
|
|
memcpy (sram + addr, buffer, size);
|
|
return size;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
sim_read (SIM_DESC sd, SIM_ADDR addr, unsigned char *buffer, int size)
|
|
{
|
|
int osize = size;
|
|
|
|
if (addr >= 0 && addr < SRAM_VADDR)
|
|
{
|
|
while (size > 0 && addr < (MAX_AVR_FLASH << 1))
|
|
{
|
|
word val = flash[addr >> 1].op;
|
|
|
|
if (addr & 1)
|
|
val >>= 8;
|
|
|
|
*buffer++ = val;
|
|
addr++;
|
|
size--;
|
|
}
|
|
return osize - size;
|
|
}
|
|
else if (addr >= SRAM_VADDR && addr < SRAM_VADDR + MAX_AVR_SRAM)
|
|
{
|
|
addr -= SRAM_VADDR;
|
|
if (addr + size > MAX_AVR_SRAM)
|
|
size = MAX_AVR_SRAM - addr;
|
|
memcpy (buffer, sram + addr, size);
|
|
return size;
|
|
}
|
|
else
|
|
{
|
|
/* Avoid errors. */
|
|
memset (buffer, 0, size);
|
|
return size;
|
|
}
|
|
}
|
|
|
|
int
|
|
sim_store_register (SIM_DESC sd, int rn, unsigned char *memory, int length)
|
|
{
|
|
if (rn < 32 && length == 1)
|
|
{
|
|
sram[rn] = *memory;
|
|
return 1;
|
|
}
|
|
if (rn == AVR_SREG_REGNUM && length == 1)
|
|
{
|
|
sram[SREG] = *memory;
|
|
return 1;
|
|
}
|
|
if (rn == AVR_SP_REGNUM && length == 2)
|
|
{
|
|
sram[REG_SP] = memory[0];
|
|
sram[REG_SP + 1] = memory[1];
|
|
return 2;
|
|
}
|
|
if (rn == AVR_PC_REGNUM && length == 4)
|
|
{
|
|
pc = (memory[0] >> 1) | (memory[1] << 7)
|
|
| (memory[2] << 15) | (memory[3] << 23);
|
|
pc &= PC_MASK;
|
|
return 4;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
sim_fetch_register (SIM_DESC sd, int rn, unsigned char *memory, int length)
|
|
{
|
|
if (rn < 32 && length == 1)
|
|
{
|
|
*memory = sram[rn];
|
|
return 1;
|
|
}
|
|
if (rn == AVR_SREG_REGNUM && length == 1)
|
|
{
|
|
*memory = sram[SREG];
|
|
return 1;
|
|
}
|
|
if (rn == AVR_SP_REGNUM && length == 2)
|
|
{
|
|
memory[0] = sram[REG_SP];
|
|
memory[1] = sram[REG_SP + 1];
|
|
return 2;
|
|
}
|
|
if (rn == AVR_PC_REGNUM && length == 4)
|
|
{
|
|
memory[0] = pc << 1;
|
|
memory[1] = pc >> 7;
|
|
memory[2] = pc >> 15;
|
|
memory[3] = pc >> 23;
|
|
return 4;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
sim_stop_reason (SIM_DESC sd, enum sim_stop * reason, int *sigrc)
|
|
{
|
|
*reason = cpu_exception;
|
|
*sigrc = cpu_signal;
|
|
}
|
|
|
|
int
|
|
sim_stop (SIM_DESC sd)
|
|
{
|
|
cpu_exception = sim_stopped;
|
|
cpu_signal = TARGET_SIGNAL_INT;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
sim_info (SIM_DESC sd, int verbose)
|
|
{
|
|
callback->printf_filtered
|
|
(callback, "\n\n# cycles %10u\n", cycles);
|
|
}
|
|
|
|
SIM_DESC
|
|
sim_open (SIM_OPEN_KIND kind, host_callback *cb, struct bfd *abfd, char **argv)
|
|
{
|
|
myname = argv[0];
|
|
callback = cb;
|
|
|
|
cur_bfd = abfd;
|
|
|
|
/* Fudge our descriptor for now. */
|
|
return (SIM_DESC) 1;
|
|
}
|
|
|
|
void
|
|
sim_close (SIM_DESC sd, int quitting)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
SIM_RC
|
|
sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
|
|
{
|
|
bfd *prog_bfd;
|
|
|
|
/* Clear all the memory. */
|
|
memset (sram, 0, sizeof (sram));
|
|
memset (flash, 0, sizeof (flash));
|
|
|
|
prog_bfd = sim_load_file (sd, myname, callback, prog, abfd,
|
|
sim_kind == SIM_OPEN_DEBUG,
|
|
0, sim_write);
|
|
if (prog_bfd == NULL)
|
|
return SIM_RC_FAIL;
|
|
|
|
avr_pc22 = (bfd_get_mach (prog_bfd) >= bfd_mach_avr6);
|
|
|
|
if (abfd != NULL)
|
|
cur_bfd = abfd;
|
|
|
|
return SIM_RC_OK;
|
|
}
|
|
|
|
SIM_RC
|
|
sim_create_inferior (SIM_DESC sd, struct bfd *prog_bfd, char **argv, char **env)
|
|
{
|
|
/* Set the initial register set. */
|
|
pc = 0;
|
|
|
|
return SIM_RC_OK;
|
|
}
|
|
|
|
void
|
|
sim_kill (SIM_DESC sd)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
void
|
|
sim_do_command (SIM_DESC sd, char *cmd)
|
|
{
|
|
/* Nothing there yet; it's all an error. */
|
|
|
|
if (cmd == NULL)
|
|
return;
|
|
|
|
if (strcmp (cmd, "verbose") == 0)
|
|
verbose = 2;
|
|
else if (strcmp (cmd, "trace") == 0)
|
|
tracing = 1;
|
|
else
|
|
sim_cb_eprintf (callback,
|
|
"Error: \"%s\" is not a valid avr simulator command.\n",
|
|
cmd);
|
|
}
|
|
|
|
void
|
|
sim_set_callbacks (host_callback *ptr)
|
|
{
|
|
callback = ptr;
|
|
}
|