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m68kmake.c
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m68kmake.c
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/* ======================================================================== */
/* ========================= LICENSING & COPYRIGHT ======================== */
/* ======================================================================== */
/*
* MUSASHI
* Version 4.60
*
* A portable Motorola M680x0 processor emulation engine.
* Copyright Karl Stenerud. All rights reserved.
* FPU and MMU by R. Belmont.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* ======================================================================== */
/* ============================ CODE GENERATOR ============================ */
/* ======================================================================== */
/*
* This is the code generator program which will generate the opcode table
* and the final opcode handlers.
*
* It requires an input file to function (default m68k_in.c), but you can
* specify your own like so:
*
* m68kmake <output path> <input file>
*
* where output path is the path where the output files should be placed, and
* input file is the file to use for input.
*
* If you modify the input file greatly from its released form, you may have
* to tweak the configuration section a bit since I'm using static allocation
* to keep things simple.
*
*
* TODO: - build a better code generator for the move instruction.
* - Add callm and rtm instructions
* - Fix RTE to handle other format words
* - Add address error (and bus error?) handling
*/
static const char g_version[] = "4.60";
/* ======================================================================== */
/* =============================== INCLUDES =============================== */
/* ======================================================================== */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
/* ======================================================================== */
/* ============================= CONFIGURATION ============================ */
/* ======================================================================== */
#define M68K_MAX_PATH 1024
#define M68K_MAX_DIR 1024
#define MAX_LINE_LENGTH 200 /* length of 1 line */
#define MAX_BODY_LENGTH 300 /* Number of lines in 1 function */
#define MAX_REPLACE_LENGTH 30 /* Max number of replace strings */
#define MAX_INSERT_LENGTH 5000 /* Max size of insert piece */
#define MAX_NAME_LENGTH 30 /* Max length of ophandler name */
#define MAX_SPEC_PROC_LENGTH 4 /* Max length of special processing str */
#define MAX_SPEC_EA_LENGTH 5 /* Max length of specified EA str */
#define EA_ALLOWED_LENGTH 11 /* Max length of ea allowed str */
#define MAX_OPCODE_INPUT_TABLE_LENGTH 1000 /* Max length of opcode handler tbl */
#define MAX_OPCODE_OUTPUT_TABLE_LENGTH 3000 /* Max length of opcode handler tbl */
/* Default filenames */
#define FILENAME_INPUT "m68k_in.c"
#define FILENAME_PROTOTYPE "m68kops.h"
#define FILENAME_TABLE "m68kops.c"
/* Identifier sequences recognized by this program */
#define ID_INPUT_SEPARATOR "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
#define ID_BASE "M68KMAKE"
#define ID_PROTOTYPE_HEADER ID_BASE "_PROTOTYPE_HEADER"
#define ID_PROTOTYPE_FOOTER ID_BASE "_PROTOTYPE_FOOTER"
#define ID_TABLE_HEADER ID_BASE "_TABLE_HEADER"
#define ID_TABLE_FOOTER ID_BASE "_TABLE_FOOTER"
#define ID_TABLE_BODY ID_BASE "_TABLE_BODY"
#define ID_TABLE_START ID_BASE "_TABLE_START"
#define ID_OPHANDLER_HEADER ID_BASE "_OPCODE_HANDLER_HEADER"
#define ID_OPHANDLER_FOOTER ID_BASE "_OPCODE_HANDLER_FOOTER"
#define ID_OPHANDLER_BODY ID_BASE "_OPCODE_HANDLER_BODY"
#define ID_END ID_BASE "_END"
#define ID_OPHANDLER_NAME ID_BASE "_OP"
#define ID_OPHANDLER_EA_AY_8 ID_BASE "_GET_EA_AY_8"
#define ID_OPHANDLER_EA_AY_16 ID_BASE "_GET_EA_AY_16"
#define ID_OPHANDLER_EA_AY_32 ID_BASE "_GET_EA_AY_32"
#define ID_OPHANDLER_OPER_AY_8 ID_BASE "_GET_OPER_AY_8"
#define ID_OPHANDLER_OPER_AY_16 ID_BASE "_GET_OPER_AY_16"
#define ID_OPHANDLER_OPER_AY_32 ID_BASE "_GET_OPER_AY_32"
#define ID_OPHANDLER_CC ID_BASE "_CC"
#define ID_OPHANDLER_NOT_CC ID_BASE "_NOT_CC"
#ifndef DECL_SPEC
#define DECL_SPEC
#endif /* DECL_SPEC */
/* ======================================================================== */
/* ============================== PROTOTYPES ============================== */
/* ======================================================================== */
enum {
CPU_TYPE_000=0,
CPU_TYPE_010,
CPU_TYPE_020,
CPU_TYPE_030,
CPU_TYPE_040,
NUM_CPUS
};
#define UNSPECIFIED "."
#define UNSPECIFIED_CH '.'
#define HAS_NO_EA_MODE(A) (strcmp(A, "..........") == 0)
#define HAS_EA_AI(A) ((A)[0] == 'A')
#define HAS_EA_PI(A) ((A)[1] == '+')
#define HAS_EA_PD(A) ((A)[2] == '-')
#define HAS_EA_DI(A) ((A)[3] == 'D')
#define HAS_EA_IX(A) ((A)[4] == 'X')
#define HAS_EA_AW(A) ((A)[5] == 'W')
#define HAS_EA_AL(A) ((A)[6] == 'L')
#define HAS_EA_PCDI(A) ((A)[7] == 'd')
#define HAS_EA_PCIX(A) ((A)[8] == 'x')
#define HAS_EA_I(A) ((A)[9] == 'I')
enum
{
EA_MODE_NONE, /* No special addressing mode */
EA_MODE_AI, /* Address register indirect */
EA_MODE_PI, /* Address register indirect with postincrement */
EA_MODE_PI7, /* Address register 7 indirect with postincrement */
EA_MODE_PD, /* Address register indirect with predecrement */
EA_MODE_PD7, /* Address register 7 indirect with predecrement */
EA_MODE_DI, /* Address register indirect with displacement */
EA_MODE_IX, /* Address register indirect with index */
EA_MODE_AW, /* Absolute word */
EA_MODE_AL, /* Absolute long */
EA_MODE_PCDI, /* Program counter indirect with displacement */
EA_MODE_PCIX, /* Program counter indirect with index */
EA_MODE_I /* Immediate */
};
/* Everything we need to know about an opcode */
typedef struct
{
char name[MAX_NAME_LENGTH]; /* opcode handler name */
unsigned char size; /* Size of operation */
char spec_proc[MAX_SPEC_PROC_LENGTH]; /* Special processing mode */
char spec_ea[MAX_SPEC_EA_LENGTH]; /* Specified effective addressing mode */
unsigned char bits; /* Number of significant bits (used for sorting the table) */
unsigned short op_mask; /* Mask to apply for matching an opcode to a handler */
unsigned short op_match; /* Value to match after masking */
char ea_allowed[EA_ALLOWED_LENGTH]; /* Effective addressing modes allowed */
char cpu_mode[NUM_CPUS]; /* User or supervisor mode */
char cpus[NUM_CPUS+1]; /* Allowed CPUs */
unsigned char cycles[NUM_CPUS]; /* cycles for 000, 010, 020, 030, 040 */
} opcode_struct;
/* All modifications necessary for a specific EA mode of an instruction */
typedef struct
{
char* fname_add;
char* ea_add;
unsigned int mask_add;
unsigned int match_add;
} ea_info_struct;
/* Holds the body of a function */
typedef struct
{
char body[MAX_BODY_LENGTH][MAX_LINE_LENGTH+1];
int length;
} body_struct;
/* Holds a sequence of search / replace strings */
typedef struct
{
char replace[MAX_REPLACE_LENGTH][2][MAX_LINE_LENGTH+1];
int length;
} replace_struct;
/* Function Prototypes */
void error_exit(char* fmt, ...);
void perror_exit(char* fmt, ...);
int check_strsncpy(char* dst, char* src, int maxlength);
int check_atoi(char* str, int *result);
int skip_spaces(char* str);
int num_bits(int value);
int atoh(char* buff);
int fgetline(char* buff, int nchars, FILE* file);
int get_oper_cycles(opcode_struct* op, int ea_mode, int cpu_type);
opcode_struct* find_opcode(char* name, int size, char* spec_proc, char* spec_ea);
opcode_struct* find_illegal_opcode(void);
int extract_opcode_info(char* src, char* name, int* size, char* spec_proc, char* spec_ea);
void add_replace_string(replace_struct* replace, char* search_str, char* replace_str);
void write_body(FILE* filep, body_struct* body, replace_struct* replace);
void get_base_name(char* base_name, opcode_struct* op);
void write_function_name(FILE* filep, char* base_name);
void add_opcode_output_table_entry(opcode_struct* op, char* name);
static int DECL_SPEC compare_nof_true_bits(const void* aptr, const void* bptr);
void print_opcode_output_table(FILE* filep);
void write_table_entry(FILE* filep, opcode_struct* op);
void set_opcode_struct(opcode_struct* src, opcode_struct* dst, int ea_mode);
void generate_opcode_handler(FILE* filep, body_struct* body, replace_struct* replace, opcode_struct* opinfo, int ea_mode);
void generate_opcode_ea_variants(FILE* filep, body_struct* body, replace_struct* replace, opcode_struct* op);
void generate_opcode_cc_variants(FILE* filep, body_struct* body, replace_struct* replace, opcode_struct* op_in, int offset);
void process_opcode_handlers(FILE* filep);
void populate_table(void);
void read_insert(char* insert);
/* ======================================================================== */
/* ================================= DATA ================================= */
/* ======================================================================== */
/* Name of the input file */
char g_input_filename[M68K_MAX_PATH] = FILENAME_INPUT;
/* File handles */
FILE* g_input_file = NULL;
FILE* g_prototype_file = NULL;
FILE* g_table_file = NULL;
int g_num_functions = 0; /* Number of functions processed */
int g_num_primitives = 0; /* Number of function primitives read */
int g_line_number = 1; /* Current line number */
/* Opcode handler table */
opcode_struct g_opcode_input_table[MAX_OPCODE_INPUT_TABLE_LENGTH];
opcode_struct g_opcode_output_table[MAX_OPCODE_OUTPUT_TABLE_LENGTH];
int g_opcode_output_table_length = 0;
const ea_info_struct g_ea_info_table[13] =
{/* fname ea mask match */
{"", "", 0x00, 0x00}, /* EA_MODE_NONE */
{"ai", "AY_AI", 0x38, 0x10}, /* EA_MODE_AI */
{"pi", "AY_PI", 0x38, 0x18}, /* EA_MODE_PI */
{"pi7", "A7_PI", 0x3f, 0x1f}, /* EA_MODE_PI7 */
{"pd", "AY_PD", 0x38, 0x20}, /* EA_MODE_PD */
{"pd7", "A7_PD", 0x3f, 0x27}, /* EA_MODE_PD7 */
{"di", "AY_DI", 0x38, 0x28}, /* EA_MODE_DI */
{"ix", "AY_IX", 0x38, 0x30}, /* EA_MODE_IX */
{"aw", "AW", 0x3f, 0x38}, /* EA_MODE_AW */
{"al", "AL", 0x3f, 0x39}, /* EA_MODE_AL */
{"pcdi", "PCDI", 0x3f, 0x3a}, /* EA_MODE_PCDI */
{"pcix", "PCIX", 0x3f, 0x3b}, /* EA_MODE_PCIX */
{"i", "I", 0x3f, 0x3c}, /* EA_MODE_I */
};
const char *const g_cc_table[16][2] =
{
{ "t", "T"}, /* 0000 */
{ "f", "F"}, /* 0001 */
{"hi", "HI"}, /* 0010 */
{"ls", "LS"}, /* 0011 */
{"cc", "CC"}, /* 0100 */
{"cs", "CS"}, /* 0101 */
{"ne", "NE"}, /* 0110 */
{"eq", "EQ"}, /* 0111 */
{"vc", "VC"}, /* 1000 */
{"vs", "VS"}, /* 1001 */
{"pl", "PL"}, /* 1010 */
{"mi", "MI"}, /* 1011 */
{"ge", "GE"}, /* 1100 */
{"lt", "LT"}, /* 1101 */
{"gt", "GT"}, /* 1110 */
{"le", "LE"}, /* 1111 */
};
/* size to index translator (0 -> 0, 8 and 16 -> 1, 32 -> 2) */
const int g_size_select_table[33] =
{
0, /* unsized */
0, 0, 0, 0, 0, 0, 0, 1, /* 8 */
0, 0, 0, 0, 0, 0, 0, 1, /* 16 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 /* 32 */
};
/* Extra cycles required for certain EA modes */
/* TODO: correct timings for 030, 040 */
const int g_ea_cycle_table[13][NUM_CPUS][3] =
{/* 000 010 020 030 040 */
{{ 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}, { 0, 0, 0}}, /* EA_MODE_NONE */
{{ 0, 4, 8}, { 0, 4, 8}, { 0, 4, 4}, { 0, 4, 4}, { 0, 4, 4}}, /* EA_MODE_AI */
{{ 0, 4, 8}, { 0, 4, 8}, { 0, 4, 4}, { 0, 4, 4}, { 0, 4, 4}}, /* EA_MODE_PI */
{{ 0, 4, 8}, { 0, 4, 8}, { 0, 4, 4}, { 0, 4, 4}, { 0, 4, 4}}, /* EA_MODE_PI7 */
{{ 0, 6, 10}, { 0, 6, 10}, { 0, 5, 5}, { 0, 5, 5}, { 0, 5, 5}}, /* EA_MODE_PD */
{{ 0, 6, 10}, { 0, 6, 10}, { 0, 5, 5}, { 0, 5, 5}, { 0, 5, 5}}, /* EA_MODE_PD7 */
{{ 0, 8, 12}, { 0, 8, 12}, { 0, 5, 5}, { 0, 5, 5}, { 0, 5, 5}}, /* EA_MODE_DI */
{{ 0, 10, 14}, { 0, 10, 14}, { 0, 7, 7}, { 0, 7, 7}, { 0, 7, 7}}, /* EA_MODE_IX */
{{ 0, 8, 12}, { 0, 8, 12}, { 0, 4, 4}, { 0, 4, 4}, { 0, 4, 4}}, /* EA_MODE_AW */
{{ 0, 12, 16}, { 0, 12, 16}, { 0, 4, 4}, { 0, 4, 4}, { 0, 4, 4}}, /* EA_MODE_AL */
{{ 0, 8, 12}, { 0, 8, 12}, { 0, 5, 5}, { 0, 5, 5}, { 0, 5, 5}}, /* EA_MODE_PCDI */
{{ 0, 10, 14}, { 0, 10, 14}, { 0, 7, 7}, { 0, 7, 7}, { 0, 7, 7}}, /* EA_MODE_PCIX */
{{ 0, 4, 8}, { 0, 4, 8}, { 0, 2, 4}, { 0, 2, 4}, { 0, 2, 4}}, /* EA_MODE_I */
};
/* Extra cycles for JMP instruction (000, 010) */
const int g_jmp_cycle_table[13] =
{
0, /* EA_MODE_NONE */
4, /* EA_MODE_AI */
0, /* EA_MODE_PI */
0, /* EA_MODE_PI7 */
0, /* EA_MODE_PD */
0, /* EA_MODE_PD7 */
6, /* EA_MODE_DI */
10, /* EA_MODE_IX */
6, /* EA_MODE_AW */
8, /* EA_MODE_AL */
6, /* EA_MODE_PCDI */
10, /* EA_MODE_PCIX */
0, /* EA_MODE_I */
};
/* Extra cycles for JSR instruction (000, 010) */
const int g_jsr_cycle_table[13] =
{
0, /* EA_MODE_NONE */
4, /* EA_MODE_AI */
0, /* EA_MODE_PI */
0, /* EA_MODE_PI7 */
0, /* EA_MODE_PD */
0, /* EA_MODE_PD7 */
6, /* EA_MODE_DI */
10, /* EA_MODE_IX */
6, /* EA_MODE_AW */
8, /* EA_MODE_AL */
6, /* EA_MODE_PCDI */
10, /* EA_MODE_PCIX */
0, /* EA_MODE_I */
};
/* Extra cycles for LEA instruction (000, 010) */
const int g_lea_cycle_table[13] =
{
0, /* EA_MODE_NONE */
4, /* EA_MODE_AI */
0, /* EA_MODE_PI */
0, /* EA_MODE_PI7 */
0, /* EA_MODE_PD */
0, /* EA_MODE_PD7 */
8, /* EA_MODE_DI */
12, /* EA_MODE_IX */
8, /* EA_MODE_AW */
12, /* EA_MODE_AL */
8, /* EA_MODE_PCDI */
12, /* EA_MODE_PCIX */
0, /* EA_MODE_I */
};
/* Extra cycles for PEA instruction (000, 010) */
const int g_pea_cycle_table[13] =
{
0, /* EA_MODE_NONE */
6, /* EA_MODE_AI */
0, /* EA_MODE_PI */
0, /* EA_MODE_PI7 */
0, /* EA_MODE_PD */
0, /* EA_MODE_PD7 */
10, /* EA_MODE_DI */
14, /* EA_MODE_IX */
10, /* EA_MODE_AW */
14, /* EA_MODE_AL */
10, /* EA_MODE_PCDI */
14, /* EA_MODE_PCIX */
0, /* EA_MODE_I */
};
/* Extra cycles for MOVEM instruction (000, 010) */
const int g_movem_cycle_table[13] =
{
0, /* EA_MODE_NONE */
0, /* EA_MODE_AI */
0, /* EA_MODE_PI */
0, /* EA_MODE_PI7 */
0, /* EA_MODE_PD */
0, /* EA_MODE_PD7 */
4, /* EA_MODE_DI */
6, /* EA_MODE_IX */
4, /* EA_MODE_AW */
8, /* EA_MODE_AL */
0, /* EA_MODE_PCDI */
0, /* EA_MODE_PCIX */
0, /* EA_MODE_I */
};
/* Extra cycles for MOVES instruction (010) */
const int g_moves_cycle_table[13][3] =
{
{ 0, 0, 0}, /* EA_MODE_NONE */
{ 0, 4, 6}, /* EA_MODE_AI */
{ 0, 4, 6}, /* EA_MODE_PI */
{ 0, 4, 6}, /* EA_MODE_PI7 */
{ 0, 6, 12}, /* EA_MODE_PD */
{ 0, 6, 12}, /* EA_MODE_PD7 */
{ 0, 12, 16}, /* EA_MODE_DI */
{ 0, 16, 20}, /* EA_MODE_IX */
{ 0, 12, 16}, /* EA_MODE_AW */
{ 0, 16, 20}, /* EA_MODE_AL */
{ 0, 0, 0}, /* EA_MODE_PCDI */
{ 0, 0, 0}, /* EA_MODE_PCIX */
{ 0, 0, 0}, /* EA_MODE_I */
};
/* Extra cycles for CLR instruction (010) */
const int g_clr_cycle_table[13][3] =
{
{ 0, 0, 0}, /* EA_MODE_NONE */
{ 0, 4, 6}, /* EA_MODE_AI */
{ 0, 4, 6}, /* EA_MODE_PI */
{ 0, 4, 6}, /* EA_MODE_PI7 */
{ 0, 6, 8}, /* EA_MODE_PD */
{ 0, 6, 8}, /* EA_MODE_PD7 */
{ 0, 8, 10}, /* EA_MODE_DI */
{ 0, 10, 14}, /* EA_MODE_IX */
{ 0, 8, 10}, /* EA_MODE_AW */
{ 0, 10, 14}, /* EA_MODE_AL */
{ 0, 0, 0}, /* EA_MODE_PCDI */
{ 0, 0, 0}, /* EA_MODE_PCIX */
{ 0, 0, 0}, /* EA_MODE_I */
};
/* ======================================================================== */
/* =========================== UTILITY FUNCTIONS ========================== */
/* ======================================================================== */
/* Print an error message and exit with status error */
void error_exit(char* fmt, ...)
{
va_list args;
fprintf(stderr, "In %s, near or on line %d:\n\t", g_input_filename, g_line_number);
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, "\n");
if(g_prototype_file) fclose(g_prototype_file);
if(g_table_file) fclose(g_table_file);
if(g_input_file) fclose(g_input_file);
exit(EXIT_FAILURE);
}
/* Print an error message, call perror(), and exit with status error */
void perror_exit(char* fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
perror("");
if(g_prototype_file) fclose(g_prototype_file);
if(g_table_file) fclose(g_table_file);
if(g_input_file) fclose(g_input_file);
exit(EXIT_FAILURE);
}
/* copy until 0 or space and exit with error if we read too far */
int check_strsncpy(char* dst, char* src, int maxlength)
{
char* p = dst;
while(*src && *src != ' ')
{
*p++ = *src++;
if(p - dst > maxlength)
error_exit("Field too long");
}
*p = 0;
return p - dst;
}
/* copy until 0 or specified character and exit with error if we read too far */
int check_strcncpy(char* dst, char* src, char delim, int maxlength)
{
char* p = dst;
while(*src && *src != delim)
{
*p++ = *src++;
if(p - dst > maxlength)
error_exit("Field too long");
}
*p = 0;
return p - dst;
}
/* convert ascii to integer and exit with error if we find invalid data */
int check_atoi(char* str, int *result)
{
int accum = 0;
char* p = str;
while(*p >= '0' && *p <= '9')
{
accum *= 10;
accum += *p++ - '0';
}
if(*p != ' ' && *p != 0)
error_exit("Malformed integer value (%c)", *p);
*result = accum;
return p - str;
}
/* Skip past spaces in a string */
int skip_spaces(char* str)
{
char* p = str;
while(*p == ' ')
p++;
return p - str;
}
/* Count the number of set bits in a value */
int num_bits(int value)
{
value = ((value & 0xaaaa) >> 1) + (value & 0x5555);
value = ((value & 0xcccc) >> 2) + (value & 0x3333);
value = ((value & 0xf0f0) >> 4) + (value & 0x0f0f);
value = ((value & 0xff00) >> 8) + (value & 0x00ff);
return value;
}
/* Convert a hex value written in ASCII */
int atoh(char* buff)
{
int accum = 0;
for(;;buff++)
{
if(*buff >= '0' && *buff <= '9')
{
accum <<= 4;
accum += *buff - '0';
}
else if(*buff >= 'a' && *buff <= 'f')
{
accum <<= 4;
accum += *buff - 'a' + 10;
}
else break;
}
return accum;
}
/* Get a line of text from a file, discarding any end-of-line characters */
int fgetline(char* buff, int nchars, FILE* file)
{
int length;
if(fgets(buff, nchars, file) == NULL)
return -1;
if(buff[0] == '\r')
memmove(buff, buff + 1, nchars - 1);
length = strlen(buff);
while(length && (buff[length-1] == '\r' || buff[length-1] == '\n'))
length--;
buff[length] = 0;
g_line_number++;
return length;
}
/* ======================================================================== */
/* =========================== HELPER FUNCTIONS =========================== */
/* ======================================================================== */
/* Calculate the number of cycles an opcode requires */
int get_oper_cycles(opcode_struct* op, int ea_mode, int cpu_type)
{
int size = g_size_select_table[op->size];
if(op->cpus[cpu_type] == '.')
return 0;
if(cpu_type < CPU_TYPE_020)
{
if(cpu_type == CPU_TYPE_010)
{
if(strcmp(op->name, "moves") == 0)
return op->cycles[cpu_type] + g_moves_cycle_table[ea_mode][size];
if(strcmp(op->name, "clr") == 0)
return op->cycles[cpu_type] + g_clr_cycle_table[ea_mode][size];
}
/* ASG: added these cases -- immediate modes take 2 extra cycles here */
if(cpu_type == CPU_TYPE_000 && ea_mode == EA_MODE_I &&
((strcmp(op->name, "add") == 0 && strcmp(op->spec_proc, "er") == 0) ||
strcmp(op->name, "adda") == 0 ||
(strcmp(op->name, "and") == 0 && strcmp(op->spec_proc, "er") == 0) ||
(strcmp(op->name, "or") == 0 && strcmp(op->spec_proc, "er") == 0) ||
(strcmp(op->name, "sub") == 0 && strcmp(op->spec_proc, "er") == 0) ||
strcmp(op->name, "suba") == 0))
return op->cycles[cpu_type] + g_ea_cycle_table[ea_mode][cpu_type][size] + 2;
if(strcmp(op->name, "jmp") == 0)
return op->cycles[cpu_type] + g_jmp_cycle_table[ea_mode];
if(strcmp(op->name, "jsr") == 0)
return op->cycles[cpu_type] + g_jsr_cycle_table[ea_mode];
if(strcmp(op->name, "lea") == 0)
return op->cycles[cpu_type] + g_lea_cycle_table[ea_mode];
if(strcmp(op->name, "pea") == 0)
return op->cycles[cpu_type] + g_pea_cycle_table[ea_mode];
if(strcmp(op->name, "movem") == 0)
return op->cycles[cpu_type] + g_movem_cycle_table[ea_mode];
}
return op->cycles[cpu_type] + g_ea_cycle_table[ea_mode][cpu_type][size];
}
/* Find an opcode in the opcode handler list */
opcode_struct* find_opcode(char* name, int size, char* spec_proc, char* spec_ea)
{
opcode_struct* op;
for(op = g_opcode_input_table;op < &g_opcode_input_table[MAX_OPCODE_INPUT_TABLE_LENGTH];op++)
{
if( strcmp(name, op->name) == 0 &&
(size == op->size) &&
strcmp(spec_proc, op->spec_proc) == 0 &&
strcmp(spec_ea, op->spec_ea) == 0)
return op;
}
return NULL;
}
/* Specifically find the illegal opcode in the list */
opcode_struct* find_illegal_opcode(void)
{
opcode_struct* op;
for(op = g_opcode_input_table;op < &g_opcode_input_table[MAX_OPCODE_INPUT_TABLE_LENGTH];op++)
{
if(strcmp(op->name, "illegal") == 0)
return op;
}
return NULL;
}
/* Parse an opcode handler name */
int extract_opcode_info(char* src, char* name, int* size, char* spec_proc, char* spec_ea)
{
char* ptr = strstr(src, ID_OPHANDLER_NAME);
if(ptr == NULL)
return 0;
ptr += strlen(ID_OPHANDLER_NAME) + 1;
ptr += check_strcncpy(name, ptr, ',', MAX_NAME_LENGTH);
if(*ptr != ',') return 0;
ptr++;
ptr += skip_spaces(ptr);
*size = atoi(ptr);
ptr = strstr(ptr, ",");
if(ptr == NULL) return 0;
ptr++;
ptr += skip_spaces(ptr);
ptr += check_strcncpy(spec_proc, ptr, ',', MAX_SPEC_PROC_LENGTH);
if(*ptr != ',') return 0;
ptr++;
ptr += skip_spaces(ptr);
ptr += check_strcncpy(spec_ea, ptr, ')', MAX_SPEC_EA_LENGTH);
if(*ptr != ')') return 0;
ptr++;
ptr += skip_spaces(ptr);
return 1;
}
/* Add a search/replace pair to a replace structure */
void add_replace_string(replace_struct* replace, char* search_str, char* replace_str)
{
if(replace->length >= MAX_REPLACE_LENGTH)
error_exit("overflow in replace structure");
strcpy(replace->replace[replace->length][0], search_str);
strcpy(replace->replace[replace->length++][1], replace_str);
}
/* Write a function body while replacing any selected strings */
void write_body(FILE* filep, body_struct* body, replace_struct* replace)
{
int i;
int j;
char* ptr;
char output[MAX_LINE_LENGTH+1];
char temp_buff[MAX_LINE_LENGTH+1];
int found;
for(i=0;i<body->length;i++)
{
strcpy(output, body->body[i]);
/* Check for the base directive header */
if(strstr(output, ID_BASE) != NULL)
{
/* Search for any text we need to replace */
found = 0;
for(j=0;j<replace->length;j++)
{
ptr = strstr(output, replace->replace[j][0]);
if(ptr)
{
/* We found something to replace */
found = 1;
strcpy(temp_buff, ptr+strlen(replace->replace[j][0]));
strcpy(ptr, replace->replace[j][1]);
strcat(ptr, temp_buff);
}
}
/* Found a directive with no matching replace string */
if(!found)
error_exit("Unknown " ID_BASE " directive [%s]", output);
}
fprintf(filep, "%s\n", output);
}
fprintf(filep, "\n\n");
}
/* Generate a base function name from an opcode struct */
void get_base_name(char* base_name, opcode_struct* op)
{
sprintf(base_name, "m68k_op_%s", op->name);
if(op->size > 0)
sprintf(base_name+strlen(base_name), "_%d", op->size);
if(strcmp(op->spec_proc, UNSPECIFIED) != 0)
sprintf(base_name+strlen(base_name), "_%s", op->spec_proc);
if(strcmp(op->spec_ea, UNSPECIFIED) != 0)
sprintf(base_name+strlen(base_name), "_%s", op->spec_ea);
}
/* Write the name of an opcode handler function */
void write_function_name(FILE* filep, char* base_name)
{
fprintf(filep, "static void %s(void)\n", base_name);
}
void add_opcode_output_table_entry(opcode_struct* op, char* name)
{
opcode_struct* ptr;
if(g_opcode_output_table_length > MAX_OPCODE_OUTPUT_TABLE_LENGTH)
error_exit("Opcode output table overflow");
ptr = g_opcode_output_table + g_opcode_output_table_length++;
*ptr = *op;
strcpy(ptr->name, name);
ptr->bits = num_bits(ptr->op_mask);
}
/*
* Comparison function for qsort()
* For entries with an equal number of set bits in
* the mask compare the match values
*/
static int DECL_SPEC compare_nof_true_bits(const void* aptr, const void* bptr)
{
const opcode_struct *a = aptr, *b = bptr;
if(a->bits != b->bits)
return a->bits - b->bits;
if(a->op_mask != b->op_mask)
return a->op_mask - b->op_mask;
return a->op_match - b->op_match;
}
void print_opcode_output_table(FILE* filep)
{
int i;
qsort((void *)g_opcode_output_table, g_opcode_output_table_length, sizeof(g_opcode_output_table[0]), compare_nof_true_bits);
for(i=0;i<g_opcode_output_table_length;i++)
write_table_entry(filep, g_opcode_output_table+i);
}
/* Write an entry in the opcode handler table */
void write_table_entry(FILE* filep, opcode_struct* op)
{
int i;
fprintf(filep, "\t{%-28s, 0x%04x, 0x%04x, {",
op->name, op->op_mask, op->op_match);
for(i=0;i<NUM_CPUS;i++)
{
fprintf(filep, "%3d", op->cycles[i]);
if(i < NUM_CPUS-1)
fprintf(filep, ", ");
}
fprintf(filep, "}},\n");
}
/* Fill out an opcode struct with a specific addressing mode of the source opcode struct */
void set_opcode_struct(opcode_struct* src, opcode_struct* dst, int ea_mode)
{
int i;
*dst = *src;
for(i=0;i<NUM_CPUS;i++)
dst->cycles[i] = get_oper_cycles(dst, ea_mode, i);
if(strcmp(dst->spec_ea, UNSPECIFIED) == 0 && ea_mode != EA_MODE_NONE)
sprintf(dst->spec_ea, "%s", g_ea_info_table[ea_mode].fname_add);
dst->op_mask |= g_ea_info_table[ea_mode].mask_add;
dst->op_match |= g_ea_info_table[ea_mode].match_add;
}
/* Generate a final opcode handler from the provided data */
void generate_opcode_handler(FILE* filep, body_struct* body, replace_struct* replace, opcode_struct* opinfo, int ea_mode)
{
char str[MAX_LINE_LENGTH+1];
opcode_struct* op = malloc(sizeof(opcode_struct));
/* Set the opcode structure and write the tables, prototypes, etc */
set_opcode_struct(opinfo, op, ea_mode);
get_base_name(str, op);
add_opcode_output_table_entry(op, str);
write_function_name(filep, str);
/* Add any replace strings needed */
if(ea_mode != EA_MODE_NONE)
{
sprintf(str, "EA_%s_8()", g_ea_info_table[ea_mode].ea_add);
add_replace_string(replace, ID_OPHANDLER_EA_AY_8, str);
sprintf(str, "EA_%s_16()", g_ea_info_table[ea_mode].ea_add);
add_replace_string(replace, ID_OPHANDLER_EA_AY_16, str);
sprintf(str, "EA_%s_32()", g_ea_info_table[ea_mode].ea_add);
add_replace_string(replace, ID_OPHANDLER_EA_AY_32, str);
sprintf(str, "OPER_%s_8()", g_ea_info_table[ea_mode].ea_add);
add_replace_string(replace, ID_OPHANDLER_OPER_AY_8, str);
sprintf(str, "OPER_%s_16()", g_ea_info_table[ea_mode].ea_add);
add_replace_string(replace, ID_OPHANDLER_OPER_AY_16, str);
sprintf(str, "OPER_%s_32()", g_ea_info_table[ea_mode].ea_add);
add_replace_string(replace, ID_OPHANDLER_OPER_AY_32, str);
}
/* Now write the function body with the selected replace strings */
write_body(filep, body, replace);
g_num_functions++;
free(op);
}
/* Generate opcode variants based on available addressing modes */
void generate_opcode_ea_variants(FILE* filep, body_struct* body, replace_struct* replace, opcode_struct* op)
{
int old_length = replace->length;
/* No ea modes available for this opcode */
if(HAS_NO_EA_MODE(op->ea_allowed))
{
generate_opcode_handler(filep, body, replace, op, EA_MODE_NONE);
return;
}
/* Check for and create specific opcodes for each available addressing mode */
if(HAS_EA_AI(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_AI);
replace->length = old_length;
if(HAS_EA_PI(op->ea_allowed))
{
generate_opcode_handler(filep, body, replace, op, EA_MODE_PI);
replace->length = old_length;
if(op->size == 8)
generate_opcode_handler(filep, body, replace, op, EA_MODE_PI7);
}
replace->length = old_length;
if(HAS_EA_PD(op->ea_allowed))
{
generate_opcode_handler(filep, body, replace, op, EA_MODE_PD);
replace->length = old_length;
if(op->size == 8)
generate_opcode_handler(filep, body, replace, op, EA_MODE_PD7);
}
replace->length = old_length;
if(HAS_EA_DI(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_DI);
replace->length = old_length;
if(HAS_EA_IX(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_IX);
replace->length = old_length;
if(HAS_EA_AW(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_AW);
replace->length = old_length;
if(HAS_EA_AL(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_AL);
replace->length = old_length;
if(HAS_EA_PCDI(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_PCDI);
replace->length = old_length;
if(HAS_EA_PCIX(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_PCIX);
replace->length = old_length;
if(HAS_EA_I(op->ea_allowed))
generate_opcode_handler(filep, body, replace, op, EA_MODE_I);
replace->length = old_length;
}
/* Generate variants of condition code opcodes */
void generate_opcode_cc_variants(FILE* filep, body_struct* body, replace_struct* replace, opcode_struct* op_in, int offset)
{
char repl[20];
char replnot[20];
int i;
int old_length = replace->length;
opcode_struct* op = malloc(sizeof(opcode_struct));
*op = *op_in;
op->op_mask |= 0x0f00;
/* Do all condition codes except t and f */
for(i=2;i<16;i++)
{
/* Add replace strings for this condition code */
sprintf(repl, "COND_%s()", g_cc_table[i][1]);
sprintf(replnot, "COND_NOT_%s()", g_cc_table[i][1]);
add_replace_string(replace, ID_OPHANDLER_CC, repl);
add_replace_string(replace, ID_OPHANDLER_NOT_CC, replnot);
/* Set the new opcode info */
strcpy(op->name+offset, g_cc_table[i][0]);
op->op_match = (op->op_match & 0xf0ff) | (i<<8);
/* Generate all opcode variants for this modified opcode */
generate_opcode_ea_variants(filep, body, replace, op);
/* Remove the above replace strings */
replace->length = old_length;
}
free(op);
}
/* Process the opcode handlers section of the input file */
void process_opcode_handlers(FILE* filep)
{
FILE* input_file = g_input_file;
char func_name[MAX_LINE_LENGTH+1];
char oper_name[MAX_LINE_LENGTH+1];
int oper_size;
char oper_spec_proc[MAX_LINE_LENGTH+1];
char oper_spec_ea[MAX_LINE_LENGTH+1];
opcode_struct* opinfo;
replace_struct* replace = malloc(sizeof(replace_struct));
body_struct* body = malloc(sizeof(body_struct));