mon/src/mon.cpp

/*
 *  mon.cpp - cxmon main program
 *
 *  cxmon (C) 1997-2004 Christian Bauer, Marc Hellwig
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <ctype.h>
#include <string>
#include <map>

#if defined(HAVE_READLINE_H)
extern "C" {
#include <readline.h>
}
#elif defined(HAVE_READLINE_READLINE_H)
extern "C" {
#include <readline/readline.h>
}
#endif

#if defined(HAVE_HISTORY_H)
extern "C" {
#include <history.h>
}
#elif defined(HAVE_READLINE_HISTORY_H)
extern "C" {
#include <readline/history.h>
}
#endif

#include "mon.h"
#include "mon_cmd.h"
#include "mon_lowmem.h"

#ifndef VERSION
#define VERSION "3"
#endif


// Buffer we're operating on
bool mon_use_real_mem = false;
uint32 mon_mem_size;
static uint8 *mem;


// Streams for input, output and error messages
FILE *monin, *monout, *monerr;

// Input line
static char *input;
static char *in_ptr;
char *mon_args_ptr;

// Current address, value of '.' in expressions
uintptr mon_dot_address;

// Current value of ':' in expression
static uint32 colon_value;


// Scanner variables
enum Token mon_token;  // Last token read
uintptr mon_number;    // Contains the number if mon_token==T_NUMBER
char *mon_string;      // Contains the string if mon_token==T_STRING
char *mon_name;        // Contains the variable name if mon_token==T_NAME


// List of installed commands
struct CmdSpec {
        const char *name;  // Name of command
        void (*func)();    // Function that executes this command
};

static CmdSpec *cmds;   // Array of CmdSpecs
static int num_cmds;    // Number of installed commands
static char *cmd_help;  // Help text for commands


// List of variables
typedef std::map<std::string, uintptr> var_map;
static var_map vars;


// Prototypes
static void init_abort();
static void exit_abort();

static void read_line(char *prompt);            // Scanner
static char get_char();
static void put_back(char c);
static enum Token get_hex_number(uintptr &i);
static enum Token get_dec_number(uintptr &i);
static enum Token get_char_number(uintptr &i);
static enum Token get_string(char *&str);
static enum Token get_hex_or_name(uintptr &i, char *&name);

static bool eor_expr(uintptr *number);  // Parser
static bool and_expr(uintptr *number);
static bool shift_expr(uintptr *number);
static bool add_expr(uintptr *number);
static bool mul_expr(uintptr *number);
static bool factor(uintptr *number);


/*
 *  Add command to mon
 */

void mon_add_command(const char *name, void (*func)(), const char *help_text)
{
        num_cmds++;
        if (cmds)
                cmds = (CmdSpec *)realloc(cmds, num_cmds * sizeof(CmdSpec));
        else
                cmds = (CmdSpec *)malloc(sizeof(CmdSpec));
        cmds[num_cmds - 1].name = name;
        cmds[num_cmds - 1].func = func;
        if (help_text) {
                if (cmd_help) {
                        cmd_help = (char *)realloc(cmd_help, strlen(cmd_help) + strlen(help_text) + 1);
                        strcat(cmd_help, help_text);
                } else
                        cmd_help = strdup(help_text);
        }
}


/*
 *  Print error message
 */

void mon_error(const char *s)
{
        fprintf(monerr, "*** %s\n", s);
}


/*
 *  CTRL-C pressed?
 */

static bool was_aborted;
static struct sigaction my_sa;

#ifdef __BEOS__
static void handle_abort(int sig, void *arg, vregs *r)
#else
static void handle_abort(int sig)
#endif
{
        was_aborted = true;
}

static void init_abort()
{
        was_aborted = false;
        sigemptyset(&my_sa.sa_mask);
#ifdef __BEOS__
        my_sa.sa_handler = (__signal_func_ptr)handle_abort;
        my_sa.sa_userdata = 0;
#else
        my_sa.sa_handler = handle_abort;
#endif
        my_sa.sa_flags = 0;
        sigaction(SIGINT, &my_sa, NULL);
}

static void exit_abort()
{
        my_sa.sa_handler = SIG_DFL;
        sigaction(SIGINT, &my_sa, NULL);
}

bool mon_aborted()
{
        bool ret = was_aborted;
        was_aborted = false;
        return ret;
}


/*
 *  Access to buffer
 */

uint32 (*mon_read_byte)(uintptr adr);

uint32 mon_read_byte_buffer(uintptr adr)
{
        return mem[adr % mon_mem_size];
}

uint32 mon_read_byte_real(uintptr adr)
{
        return *(uint8 *)adr;
}

void (*mon_write_byte)(uintptr adr, uint32 b);

void mon_write_byte_buffer(uintptr adr, uint32 b)
{
        mem[adr % mon_mem_size] = b;
}

void mon_write_byte_real(uintptr adr, uint32 b)
{
        *(uint8 *)adr = b;
}

uint32 mon_read_half(uintptr adr)
{
        return (mon_read_byte(adr) << 8) | mon_read_byte(adr+1);
}

void mon_write_half(uintptr adr, uint32 w)
{
        mon_write_byte(adr, w >> 8);
        mon_write_byte(adr+1, w);
}

uint32 mon_read_word(uintptr adr)
{
        return (mon_read_byte(adr) << 24) | (mon_read_byte(adr+1) << 16) | (mon_read_byte(adr+2) << 8) | mon_read_byte(adr+3);
}

void mon_write_word(uintptr adr, uint32 l)
{
        mon_write_byte(adr, l >> 24);
        mon_write_byte(adr+1, l >> 16);
        mon_write_byte(adr+2, l >> 8);
        mon_write_byte(adr+3, l);
}


/*
 *  Read a line from the keyboard
 */

static void read_line(char *prompt)
{
#ifdef HAVE_LIBREADLINE
        if (input)
                free(input);
        input = readline(prompt);

        if (input) {
                if (*input)
                        add_history(input);
        } else {
                // EOF, quit cxmon
                input = (char *)malloc(2);
                input[0] = 'x';
                input[1] = 0;
                fprintf(monout, "x\n");
        }

        in_ptr = input;
#else
        static const unsigned INPUT_LENGTH = 256;
        if (!input)
                input = (char *)malloc(INPUT_LENGTH);
        fprintf(monout, prompt);
        fflush(monout);
        fgets(in_ptr = input, INPUT_LENGTH, monin);
        char *s = strchr(input, '\n');
        if (s != NULL)
                *s = 0;
#endif
}


/*
 *  Read a character from the input line
 */

static char get_char()
{
        return *in_ptr++;
}


/*
 *  Stuff back a character into the input line
 */

static void put_back(char c)
{
        *(--in_ptr) = c;
}


/*
 *  Scanner: Get a token from the input line
 */

enum Token mon_get_token()
{
        char c = get_char();

        // Skip spaces
        while (isspace(c))
                c = get_char();

        switch (c) {
                case 0:
                        return mon_token = T_END;
                case '(':
                        return mon_token = T_LPAREN;
                case ')':
                        return mon_token = T_RPAREN;
                case '.':
                        return mon_token = T_DOT;
                case ':':
                        return mon_token = T_COLON;
                case ',':
                        return mon_token = T_COMMA;
                case '+':
                        return mon_token = T_PLUS;
                case '-':
                        return mon_token = T_MINUS;
                case '*':
                        return mon_token = T_MUL;
                case '/':
                        return mon_token = T_DIV;
                case '%':
                        return mon_token = T_MOD;
                case '&':
                        return mon_token = T_AND;
                case '|':
                        return mon_token = T_OR;
                case '^':
                        return mon_token = T_EOR;
                case '<':
                        if (get_char() == '<')
                                return mon_token = T_SHIFTL;
                        else {
                                mon_error("Unrecognized token");
                                return mon_token = T_NULL;
                        }
                case '>':
                        if (get_char() == '>')
                                return mon_token = T_SHIFTR;
                        else {
                                mon_error("Unrecognized token");
                                return mon_token = T_NULL;
                        }
                case '~':
                        return mon_token = T_NOT;
                case '=':
                        return mon_token = T_ASSIGN;

                case '$':
                        if ((mon_token = get_hex_number(mon_number)) == T_NULL)
                                mon_error("'$' must be followed by hexadecimal number");
                        return mon_token;
                case '_':
                        if ((mon_token = get_dec_number(mon_number)) == T_NULL)
                                mon_error("'_' must be followed by decimal number");
                        return mon_token;
                case '\'':
                        return mon_token = get_char_number(mon_number);
                case '"':
                        return mon_token = get_string(mon_string);

                default:
                        if (isalnum(c)) {
                                put_back(c);
                                return mon_token = get_hex_or_name(mon_number, mon_name);
                        }
                        mon_error("Unrecognized token");
                        return mon_token = T_NULL;
        }
}

static enum Token get_hex_number(uintptr &i)
{
        char c = get_char();

        i = 0;
        if (!isxdigit(c))
                return T_NULL;

        do {
                c = tolower(c);
                if (c < 'a')
                        i = (i << 4) + (c - '0');
                else
                        i = (i << 4) + (c - 'a' + 10);
                c = get_char();
        } while (isxdigit(c));

        if (isalnum(c))
                return T_NULL;
        else {
                put_back(c);
                return T_NUMBER;
        }
}

static enum Token get_dec_number(uintptr &i)
{
        char c = get_char();

        i = 0;
        if (!isdigit(c))
                return T_NULL;

        do {
                i = (i * 10) + (c - '0');
                c = get_char();
        } while (isdigit(c));

        if (isalnum(c))
                return T_NULL;
        else {
                put_back(c);
                return T_NUMBER;
        }
}

static enum Token get_char_number(uintptr &i)
{
        char c;

        i = 0;
        while ((c = get_char()) != 0) {
                if (c == '\'')
                        return T_NUMBER;
                i = (i << 8) + (uint8)c;
        }

        mon_error("Unterminated character constant");
        return T_NULL;
}

static enum Token get_string(char *&str)
{
        // Remember start of string
        char *old_in_ptr = in_ptr;

        // Determine string length
        char c;
        unsigned n = 0;
        while ((c = get_char()) != 0) {
                n++;
                if (c == '"')
                        break;
        }
        if (c == 0) {
                mon_error("Unterminated string");
                return T_NULL;
        }

        // Allocate new buffer (n: size needed including terminating 0)
        str = (char *)realloc(str, n);

        // Copy string to buffer
        char *p = str;
        in_ptr = old_in_ptr;
        while (--n)
                *p++ = get_char();
        *p++ = 0;
        get_char();  // skip closing '"'
        return T_STRING;
}

static enum Token get_hex_or_name(uintptr &i, char *&name)
{
        // Remember start of token
        char *old_in_ptr = in_ptr;

        // Try hex number first
        if (get_hex_number(i) == T_NUMBER)
                return T_NUMBER;

        // Not a hex number, must be a variable name; determine its length
        in_ptr = old_in_ptr;
        char c = get_char();
        unsigned n = 1;
        do {
                n++;
                c = get_char();
        } while (isalnum(c));

        // Allocate new buffer (n: size needed including terminating 0)
        name = (char *)realloc(name, n);

        // Copy name to buffer
        in_ptr = old_in_ptr;
        char *p = name;
        while (--n)
                *p++ = get_char();
        *p = 0;
        return T_NAME;
}


/*
 *  expression = eor_expr {OR eor_expr}
 *  true: OK, false: Error
 */

bool mon_expression(uintptr *number)
{
        uintptr accu, expr;

        if (!eor_expr(&accu))
                return false;

        for (;;)
                switch (mon_token) {
                        case T_OR:
                                mon_get_token();
                                if (!eor_expr(&expr))
                                        return false;
                                accu |= expr;
                                break;

                        default:
                                *number = accu;
                                return true;
                }
}


/*
 *  eor_expr = and_expr {EOR and_expr}
 *  true: OK, false: Error
 */

static bool eor_expr(uintptr *number)
{
        uintptr accu, expr;

        if (!and_expr(&accu))
                return false;

        for (;;)
                switch (mon_token) {
                        case T_EOR:
                                mon_get_token();
                                if (!and_expr(&expr))
                                        return false;
                                accu ^= expr;
                                break;

                        default:
                                *number = accu;
                                return true;
                }
}


/*
 *  and_expr = shift_expr {AND shift_expr}
 *  true: OK, false: Error
 */

static bool and_expr(uintptr *number)
{
        uintptr accu, expr;

        if (!shift_expr(&accu))
                return false;

        for (;;)
                switch (mon_token) {
                        case T_AND:
                                mon_get_token();
                                if (!shift_expr(&expr))
                                        return false;
                                accu &= expr;
                                break;

                        default:
                                *number = accu;
                                return true;
                }
}


/*
 *  shift_expr = add_expr {(SHIFTL | SHIFTR) add_expr}
 *  true: OK, false: Error
 */

static bool shift_expr(uintptr *number)
{
        uintptr accu, expr;

        if (!add_expr(&accu))
                return false;

        for (;;)
                switch (mon_token) {
                        case T_SHIFTL:
                                mon_get_token();
                                if (!add_expr(&expr))
                                        return false;
                                accu <<= expr;
                                break;

                        case T_SHIFTR:
                                mon_get_token();
                                if (!add_expr(&expr))
                                        return false;
                                accu >>= expr;
                                break;

                        default:
                                *number = accu;
                                return true;
                }
}


/*
 *  add_expr = mul_expr {(PLUS | MINUS) mul_expr}
 *  true: OK, false: Error
 */

static bool add_expr(uintptr *number)
{
        uintptr accu, expr;

        if (!mul_expr(&accu))
                return false;

        for (;;)
                switch (mon_token) {
                        case T_PLUS:
                                mon_get_token();
                                if (!mul_expr(&expr))
                                        return false;
                                accu += expr;
                                break;

                        case T_MINUS:
                                mon_get_token();
                                if (!mul_expr(&expr))
                                        return false;
                                accu -= expr;
                                break;

                        default:
                                *number = accu;
                                return true;
                }
}


/*
 *  mul_expr = factor {(MUL | DIV | MOD) factor}
 *  true: OK, false: Error
 */

static bool mul_expr(uintptr *number)
{
        uintptr accu, fact;

        if (!factor(&accu))
                return false;

        for (;;)
                switch (mon_token) {
                        case T_MUL:
                                mon_get_token();
                                if (!factor(&fact))
                                        return false;
                                accu *= fact;
                                break;

                        case T_DIV:
                                mon_get_token();
                                if (!factor(&fact))
                                        return false;
                                if (fact == 0) {
                                        mon_error("Division by 0");
                                        return false;
                                }
                                accu /= fact;
                                break;

                        case T_MOD:
                                mon_get_token();
                                if (!factor(&fact))
                                        return false;
                                if (fact == 0) {
                                        mon_error("Division by 0");
                                        return false;
                                }
                                accu %= fact;
                                break;

                        default:
                                *number = accu;
                                return true;
                }
}


/*
 *  factor = NUMBER | NAME | DOT | COLON | (PLUS | MINUS | NOT) factor | LPAREN expression RPAREN
 *  true: OK, false: Error
 */

static bool factor(uintptr *number)
{
        switch (mon_token) {
                case T_NUMBER:
                        *number = mon_number;
                        mon_get_token();
                        return true;

                case T_NAME:{
                        var_map::const_iterator v = vars.find(mon_name);
                        if (v == vars.end())
                                return false;
                        else {
                                *number = v->second;
                                mon_get_token();
                                return true;
                        }
                }

                case T_DOT:
                        *number = mon_dot_address;
                        mon_get_token();
                        return true;

                case T_COLON:
                        *number = colon_value;
                        mon_get_token();
                        return true;

                case T_PLUS:
                        mon_get_token();
                        return factor(number);

                case T_MINUS:
                        mon_get_token();
                        if (factor(number)) {
                                *number = -*number;
                                return true;
                        } else
                                return false;

                case T_NOT:
                        mon_get_token();
                        if (factor(number)) {
                                *number = ~*number;
                                return true;
                        } else
                                return false;

                case T_LPAREN:
                        mon_get_token();
                        if (mon_expression(number))
                                if (mon_token == T_RPAREN) {
                                        mon_get_token();
                                        return true;
                                } else {
                                        mon_error("Missing ')'");
                                        return false;
                                }
                        else {
                                mon_error("Error in expression");
                                return false;
                        }

                case T_END:
                        mon_error("Required argument missing");
                        return false;

                default:
                        mon_error("'(' or number expected");
                        return false;
        }
}


/*
 *  Set/clear/show variables
 *  set [var[=value]]
 */

static void set_var()
{
        if (mon_token == T_END) {

                // Show all variables
                if (vars.empty())
                        fprintf(monout, "No variables defined\n");
                else {
                        var_map::const_iterator v = vars.begin(), end = vars.end();
                        for (v=vars.begin(); v!=end; ++v)
                                fprintf(monout, "%s = %08lx\n", v->first.c_str(), v->second);
                }

        } else if (mon_token == T_NAME) {
                std::string var_name = mon_name;
                mon_get_token();
                if (mon_token == T_ASSIGN) {

                        // Set variable
                        uintptr value;
                        mon_get_token();
                        if (!mon_expression(&value))
                                return;
                        if (mon_token != T_END) {
                                mon_error("Too many arguments");
                                return;
                        }
                        vars[var_name] = value;

                } else if (mon_token == T_END) {

                        // Clear variable
                        vars.erase(var_name);

                } else
                        mon_error("'=' expected");
        } else
                mon_error("Variable name expected");
}


/*
 *  Clear all variables
 *  cv
 */

static void clear_vars()
{
        vars.clear();
}


/*
 *  Display help
 *  h
 */

static void help_or_hunt()
{
        if (mon_token != T_END) {
                hunt();
                return;
        }
        fprintf(monout, "x                        Quit mon\n"
                                        "h                        This help text\n");
        fprintf(monout, cmd_help);
}


/*
 *  Display command list
 *  ??
 */

static void mon_cmd_list()
{
        for (int i=0; i<num_cmds; i++)
                fprintf(monout, "%s ", cmds[i].name);
        fprintf(monout, "\n");
}


/*
 *  Reallocate buffer
 *  @ [size]
 */

static void reallocate()
{
        uintptr size;

        if (mon_use_real_mem) {
                fprintf(monerr, "Cannot reallocate buffer in real mode\n");
                return;
        }

        if (mon_token == T_END) {
                fprintf(monerr, "Buffer size: %08x bytes\n", mon_mem_size);
                return;
        }

        if (!mon_expression(&size))
                return;
        if (mon_token != T_END) {
                mon_error("Too many arguments");
                return;
        }

        if ((mem = (uint8 *)realloc(mem, size)) != NULL)
                fprintf(monerr, "Buffer size: %08x bytes\n", mon_mem_size = size);
        else
                fprintf(monerr, "Unable to reallocate buffer\n");
}


/*
 *  Apply expression to memory
 *  y[b|h|w] start end expression
 */

static void apply(int size)
{
        uintptr adr, end_adr, value;
        char c;

        if (!mon_expression(&adr))
                return;
        if (!mon_expression(&end_adr))
                return;
        if (!mon_expression(&value))
                return;
        if (mon_token != T_END) {
                mon_error("Too many arguments");
                return;
        }

        uint32 (*read_func)(uintptr adr);
        void (*write_func)(uintptr adr, uint32 val);
        switch (size) {
                case 1:
                        read_func = mon_read_byte;
                        write_func = mon_write_byte;
                        break;
                case 2:
                        read_func = mon_read_half;
                        write_func = mon_write_half;
                        break;
                case 4:
                        read_func = mon_read_word;
                        write_func = mon_write_word;
                        break;
                default:
                        abort();
                        break;
        }

        while (adr<=end_adr) {
                colon_value = read_func(adr);
                mon_dot_address = adr;

                in_ptr = input;
                while ((c = get_char()) == ' ') ;
                while ((c = get_char()) != ' ') ;
                while ((c = get_char()) == ' ') ;
                put_back(c);
                mon_get_token();
                mon_expression(&value); // Skip start address
                mon_expression(&value); // Skip end address
                mon_expression(&value);

                write_func(adr, value);
                adr += size;
        }

        mon_dot_address = adr;
}

static void apply_byte()
{
        apply(1);
}

static void apply_half()
{
        apply(2);
}

static void apply_word()
{
        apply(4);
}


/*
 *  Execute command via system() (for ls, rm, etc.)
 */

static void mon_exec()
{
        system(input);
}


/*
 *  Change current directory
 */

void mon_change_dir()
{
        in_ptr = input;
        char c = get_char();
        while (isspace(c))
                c = get_char();
        while (isgraph(c))
                c = get_char();
        while (isspace(c))
                c = get_char();
        put_back(c);
        if (chdir(in_ptr) != 0)
                mon_error("Cannot change directory");
}


/*
 *  Initialize mon
 */

void mon_init()
{
        cmds = NULL;
        num_cmds = 0;
        cmd_help = NULL;

        mon_add_command("??", mon_cmd_list,                             "??                       Show list of commands\n");
        mon_add_command("ver", version,                                 "ver                      Show version\n");
        mon_add_command("?", print_expr,                                "? expression             Calculate expression\n");
        mon_add_command("@", reallocate,                                "@ [size]                 Reallocate buffer\n");
        mon_add_command("i", ascii_dump,                                "i [start [end]]          ASCII memory dump\n");
        mon_add_command("m", memory_dump,                               "m [start [end]]          Hex/ASCII memory dump\n");
        mon_add_command("b", binary_dump,                               "b [start [end]]          Binary memory dump\n");
        mon_add_command("d", disassemble_ppc,                   "d [start [end]]          Disassemble PowerPC code\n");
        mon_add_command("d65", disassemble_6502,                "d65 [start [end]]        Disassemble 6502 code\n");
        mon_add_command("d68", disassemble_680x0,               "d68 [start [end]]        Disassemble 680x0 code\n");
        mon_add_command("d80", disassemble_z80,                 "d80 [start [end]]        Disassemble Z80 code\n");
        mon_add_command("d86", disassemble_80x86_32,    "d86 [start [end]]        Disassemble 80x86 (32-bit) code\n");
        mon_add_command("d8086", disassemble_80x86_16,  "d8086 [start [end]]      Disassemble 80x86 (16-bit) code\n");
        mon_add_command("d8664", disassemble_x86_64,    "d8664 [start [end]]      Disassemble x86-64 code\n");
        mon_add_command("dm", disassemble_mips,                 "dm [start [end]]         Disassemble MIPS code\n");
        mon_add_command("dmel", disassemble_mipsel,             "dmel [start [end]]       Disassemble MIPS (little-endian) code\n");
        mon_add_command(":", modify,                                    ": start string           Modify memory\n");
        mon_add_command("f", fill,                                              "f start end string       Fill memory\n");
        mon_add_command("y", apply_byte,                                "y[b|h|w] start end expr  Apply expression to memory\n");
        mon_add_command("yb", apply_byte, NULL);
        mon_add_command("yh", apply_half, NULL);
        mon_add_command("yw", apply_word, NULL);
        mon_add_command("t", transfer,                                  "t start end dest         Transfer memory\n");
        mon_add_command("c", compare,                                   "c start end dest         Compare memory\n");
        mon_add_command("h", help_or_hunt,                              "h start end string       Search for byte string\n");
        mon_add_command("\\", shell_command,                    "\\ \"command\"              Execute shell command\n");
        mon_add_command("ls", mon_exec,                                 "ls [args]                List directory contents\n");
        mon_add_command("rm", mon_exec,                                 "rm [args]                Remove file(s)\n");
        mon_add_command("cp", mon_exec,                                 "cp [args]                Copy file(s)\n");
        mon_add_command("mv", mon_exec,                                 "mv [args]                Move file(s)\n");
        mon_add_command("cd", mon_change_dir,                   "cd directory             Change current directory\n");
        mon_add_command("o", redir_output,                              "o [\"file\"]               Redirect output\n");
        mon_add_command("[", load_data,                                 "[ start \"file\"           Load data from file\n");
        mon_add_command("]", save_data,                                 "] start size \"file\"      Save data to file\n");
        mon_add_command("set", set_var,                                 "set [var[=value]]        Set/clear/show variables\n");
        mon_add_command("cv", clear_vars,                               "cv                       Clear all variables\n");

        mon_read_byte = NULL;
        mon_write_byte = NULL;

        input = NULL;
        mon_string = NULL;
        mon_name = NULL;
}


/*
 *  Deinitialize mon
 */

void mon_exit()
{
        if (cmds) {
                free(cmds);
                cmds = NULL;
        }
        num_cmds = 0;
        cmd_help = NULL;

        if (input) {
                free(input);
                input = NULL;
        }
        if (mon_string) {
                free(mon_string);
                mon_string = NULL;
        }
        if (mon_name) {
                free(mon_name);
                mon_name = NULL;
        }
}


/*
 *  Main function, read-execute loop
 */

void mon(int argc, char **argv)
{
        bool done = false, interactive = true;

        // Setup input/output streams
        monin = stdin;
        monout = stdout;
        monerr = stdout;

        // Make argc/argv point to the actual arguments
        const char *prg_name = argv[0];
        if (argc)
                argc--; argv++;

        // Parse arguments
        mon_macos_mode = false;
        mon_use_real_mem = false;
        while (argc > 0) {
                if (strcmp(argv[0], "-h") == 0 || strcmp(argv[0], "--help") == 0) {
                        printf("Usage: %s [-m] [-r] [command...]\n", prg_name);
                        exit(0);
                } else if (strcmp(argv[0], "-m") == 0)
                        mon_macos_mode = true;
                else if (strcmp(argv[0], "-r") == 0)
                        mon_use_real_mem = true;
                else
                        break;
                argc--; argv++;
        }
        interactive = (argc == 0);

        // Set up memory access functions if not supplied by the user
        if (mon_read_byte == NULL) {
                if (mon_use_real_mem)
                        mon_read_byte = mon_read_byte_real;
                else
                        mon_read_byte = mon_read_byte_buffer;
        }
        if (mon_write_byte == NULL) {
                if (mon_use_real_mem)
                        mon_write_byte = mon_write_byte_real;
                else
                        mon_write_byte = mon_write_byte_buffer;
        }

        // Allocate buffer
        if (!mon_use_real_mem) {
                mon_mem_size = 0x100000;
                mem = (uint8 *)malloc(mon_mem_size);

                // Print banner
                if (interactive)
                        fprintf(monerr, "\n *** cxmon V" VERSION " by Christian Bauer and Marc Hellwig ***\n"
                                                        " ***               Press 'h' for help               ***\n\n");
        }

        // Clear variables
        vars.clear();

        // In MacOS mode, pull in the lowmem globals as variables
        if (mon_macos_mode) {
                const lowmem_info *l = lowmem;
                while (l->name) {
                        vars[l->name] = l->addr;
                        l++;
                }
        }

        init_abort();

        // Read and parse command line
        char *cmd = NULL;
        while (!done) {
                if (interactive) {
                        char prompt[16];
                        sprintf(prompt, "[%0*lx]-> ", int(2 * sizeof(mon_dot_address)), mon_dot_address);
                        read_line(prompt);
                        if (!input) {
                                done = true;
                                continue;
                        }
                } else {
                        if (argc == 0) {
                                done = true;
                                break;
                        } else {
                                unsigned n = strlen(argv[0]) + 1;
                                input = (char *)realloc(input, n);
                                strcpy(in_ptr = input, argv[0]);
                                argc--;
                                argv++;
                        }
                }

                // Skip leading spaces
                char c = get_char();
                while (isspace(c))
                        c = get_char();
                put_back(c);
                if (!c)
                        continue;  // blank line

                // Read command word
                char *p = in_ptr;
                while (isgraph(c))
                        c = get_char();
                put_back(c);
                unsigned n = in_ptr - p;
                cmd = (char *)realloc(cmd, n + 1);
                memcpy(cmd, p, n);
                cmd[n] = 0;

                // Execute command
                if (strcmp(cmd, "x") == 0) {    // Exit
                        done = true;
                        continue;
                }
                for (int i=0; i<num_cmds; i++) {
                        if (strcmp(cmd, cmds[i].name) == 0) {
                                mon_get_token();
                                cmds[i].func();
                                goto cmd_done;
                        }
                }
                mon_error("Unknown command");
cmd_done: ;
        }

        if (cmd)
                free(cmd);

        exit_abort();

        // Free buffer
        if (!mon_use_real_mem)
                free(mem);

        // Close output file if redirected
        if (monout != monerr)
                fclose(monout);
}
Revision:	1.27
Committed:	2007-06-07T09:51:56Z (17 years, 5 months ago) by gbeauche
Branch:	MAIN
Changes since 1.26:	+2 -0 lines
Log Message:	Add MIPS disassembler invoked as "dm" and "dmel" (little-endian) for now.