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txd.c
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txd.c
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/* txd.c V7/3
*
* Z code disassembler for Infocom game files
*
* Requires txio.c, getopt.c, showverb.c and tx.h.
*
* Works for all V1, V2, V3, V4, V5, V6, V7 and V8 games.
*
* Usage: txd story-file-name
*
* Mark Howell 25 August 1992 howell_ma@movies.enet.dec.com
*
* History:
* Merge separate disassemblers for each type into one program
* Fix logic error in low routine scan
* Force PC past start PC in middle routine scan
* Update opcodes
* Add pre-action and action verb names to routines
* Add print mode descriptions
* Wrap long lines of text
* Cleanup for 16 bit machines
* Change JGE and JLE to JG and JL
* Add support for V1 and V2 games
* Fix bug in printing of last string
* Add symbolic names for routines and labels
* Add verb syntax
* Improve verb formatting
* Add command line options
* Fix check for low address
* Add a switch to turn off grammar
* Add support for V6 games
* Make start of code for low scan the end of dictionary data
* Generate Inform style syntax as an option
* Add dump style and width option
* Fix lint warnings
* Fix inter-routine backward jumps
* Update operand names
* Add support for V7 and V8 games
* Limit cache size to MAX_CACHE pages
* Improve translation of constants to symbols
* Distinguish between pre-actions and Inform parsing routines
* Introduce indirect operands, eg. load [sp] sp
* Fix object 0 problem
* Add support for European characters (codes up to 223)
* Add support for Inform 6 (helped by Matthew T. Russotto)
* Add support for GV2 (MTR)
* Add support for Infocom V6 games
* Fix dependencies on sizeof(int) == 2 (mostly cosmetic) NOT DONE
* Add -S dump-strings at address option
* Remove GV2A support
* Add unicode disassembly support
* Add Inform and user symbol table support
*/
#include "tx.h"
#define MAX_PCS 100
#define ROUND_CODE(address) ((address + (code_scaler - 1)) & ~(code_scaler - 1))
#define ROUND_DATA(address) ((address + (story_scaler - 1)) & ~(story_scaler - 1))
#ifndef HAS_GETOPT
#ifdef __STDC__
extern int getopt (int, char *[], const char *);
#else
extern int getopt ();
#endif
#endif
#ifdef __STDC__
static void process_story (const char *);
static void decode_program (void);
static int decode_routine (void);
static int decode_code (void);
static int decode_opcode (void);
static int decode_operands (const char *, int, int, int, int, int, int);
static int decode_parameters (int *);
static int decode_parameter (int, int);
static int decode_extra (void);
static void decode_strings (unsigned long);
static void scan_strings (unsigned long);
static int lookup_string (unsigned long);
static void lookup_verb (unsigned long);
static void setup_dictionary (void);
static int in_dictionary (unsigned long);
static void add_label (unsigned long);
static void add_routine (unsigned long);
static int lookup_label (unsigned long, int);
static int lookup_routine (unsigned long, int);
static void renumber_cref (cref_item_t *);
static void free_cref (cref_item_t *);
static int print_object_desc (unsigned int);
static void print_text (unsigned long *);
static void print_integer (unsigned int, int);
static void dump_data (unsigned long, unsigned long);
static void dump_opcode (unsigned long, int, int, int *, int);
static void dump_operand (unsigned long *, int, int, int *, int *);
static void print_variable (int);
#else
static void process_story ();
static void decode_program ();
static int decode_routine ();
static int decode_code ();
static int decode_opcode ();
static int decode_operands ();
static int decode_parameters ();
static int decode_parameter ();
static int decode_extra ();
static void decode_strings ();
static void scan_strings ();
static int lookup_string ();
static void lookup_verb ();
static void setup_dictionary ();
static int in_dictionary ();
static void add_label ();
static void add_routine ();
static int lookup_label ();
static int lookup_routine ();
static void renumber_cref ();
static void free_cref ();
static int print_object_desc ();
static void print_text ();
static void print_integer ();
static void dump_data ();
static void dump_opcode ();
static void dump_operand ();
static void print_variable ();
#endif
static unsigned long pctable[MAX_PCS];
static int pcindex = 0;
static unsigned long start_data_pc, end_data_pc;
static decode_t decode;
static opcode_t opcode;
static cref_item_t *strings_base = NULL;
static cref_item_t *routines_base = NULL;
static cref_item_t *current_routine = NULL;
static int locals_count = 0;
static unsigned long start_of_routine = 0;
static unsigned int verb_count = 0;
static unsigned int action_count = 0;
static unsigned int parse_count = 0;
static unsigned int parser_type = 0;
static unsigned int prep_type = 0;
static unsigned long verb_table_base = 0;
static unsigned long verb_data_base = 0;
static unsigned long action_table_base = 0;
static unsigned long preact_table_base = 0;
static unsigned long prep_table_base = 0;
static unsigned long prep_table_end = 0;
static const int verb_sizes[4] = { 2, 4, 7, 7 };
static unsigned long dict_start = 0;
static unsigned long dict_end = 0;
static unsigned long word_size = 0;
static unsigned long word_count = 0;
static unsigned long code_base = 0;
static unsigned int obj_count = 0;
static unsigned long obj_table_base = 0, obj_table_end = 0, obj_data_base = 0, obj_data_end = 0;
static unsigned short inform_version = 0;
static unsigned long class_numbers_base = 0, class_numbers_end = 0;
static unsigned long property_names_base = 0, property_names_end = 0;
static unsigned long attr_names_base = 0, attr_names_end = 0;
#ifndef HAS_GETOPT
/* getopt linkages */
extern int optind;
extern const char *optarg;
#endif
static int option_labels = 1;
static int option_grammar = 1;
static int option_dump = 0;
static int option_width = 79;
static int option_symbols = 0;
static unsigned long string_location = 0;
#ifdef __STDC__
int main (int argc, char *argv [])
#else
int main (argc, argv)
int argc;
char *argv [];
#endif
{
int c, errflg = 0;
/* Parse the options */
while ((c = getopt (argc, argv, "abdghnsw:S:u:")) != EOF) {
switch (c) {
case 'a':
option_inform = 6;
break;
case 'd':
option_dump = 1;
break;
case 'g':
option_grammar = 0;
break;
case 'n':
option_labels = 0;
break;
case 'w':
option_width = atoi (optarg);
break;
case 'u':
init_symbols(optarg);
/*FALLTHRU*/
case 's':
option_symbols = 1;
break;
case 'S':
#ifdef HAS_STRTOUL
string_location = strtoul(optarg, (char **)NULL, 0);
#else
string_location = atoi(optarg);
#endif
break;
case 'h':
case '?':
default:
errflg++;
}
}
/* Display usage if unknown flag or no story file */
if (errflg || optind >= argc) {
(void) fprintf (stderr, "usage: %s [options...] story-file [story-file...]\n\n", argv[0]);
(void) fprintf (stderr, "TXD version 7/3 - disassemble Infocom story files. By Mark Howell\n");
(void) fprintf (stderr, "Works with V1 to V8 Infocom games.\n\n");
(void) fprintf (stderr, "\t-a generate alternate syntax used by Inform\n");
(void) fprintf (stderr, "\t-d dump hex of opcodes and data\n");
(void) fprintf (stderr, "\t-g turn off grammar for action routines\n");
(void) fprintf (stderr, "\t-n use addresses instead of labels\n");
(void) fprintf (stderr, "\t-w n display width (0 = no wrap)\n");
(void) fprintf (stderr, "\t-s Symbolic mode (Inform 6+ only)\n");
(void) fprintf (stderr, "\t-u <file> Read user symbol table, implies -s for Inform games\n");
(void) fprintf (stderr, "\t-S n Dump high strings only, starting at address n\n");
exit (EXIT_FAILURE);
}
/* Process any story files on the command line */
for (; optind < argc; optind++)
process_story (argv[optind]);
exit (EXIT_SUCCESS);
return (0);
}/* main */
#ifdef __STDC__
static void process_story (const char *file_name)
#else
static void process_story (file_name)
const char *file_name;
#endif
{
tx_set_width (option_width);
open_story (file_name);
configure (V1, V8);
load_cache ();
setup_dictionary ();
if (option_grammar)
configure_parse_tables (&verb_count, &action_count, &parse_count, &parser_type, &prep_type,
&verb_table_base, &verb_data_base,
&action_table_base, &preact_table_base,
&prep_table_base, &prep_table_end);
if (option_symbols && (parser_type >= inform_gv1)) {
configure_object_tables (&obj_count, &obj_table_base, &obj_table_end,
&obj_data_base, &obj_data_end);
configure_inform_tables(obj_data_end, &inform_version, &class_numbers_base, &class_numbers_end,
&property_names_base, &property_names_end, &attr_names_base, &attr_names_end);
}
if (header.version != V6 && header.version != V7) {
decode.pc = code_base = dict_end;
decode.initial_pc = (unsigned long) header.start_pc - 1;
} else {
decode.pc = code_base = (unsigned long) header.routines_offset * story_scaler;
decode.initial_pc = decode.pc + (unsigned long) header.start_pc * code_scaler;
}
tx_printf ("Resident data ends at %lx, program starts at %lx, file ends at %lx\n",
(unsigned long) header.resident_size, (unsigned long) decode.initial_pc, (unsigned long) file_size);
tx_printf ("\nStarting analysis pass at address %lx\n", (unsigned long) decode.pc);
#if defined(TXD_DEBUG)
decode.first_pass = 0;
decode.low_address = decode.initial_pc;
decode.high_address = file_size;
#if 0
decode.low_address = atoi (getenv ("LOW_ADDRESS"));
decode.high_address = atoi (getenv ("HIGH_ADDRESS"));
#endif
#else
decode.first_pass = 1;
#endif
if (string_location) {
decode_strings (string_location);
exit(0);
}
decode_program ();
scan_strings (decode.pc);
#if !defined(TXD_DEBUG)
tx_printf ("\nEnd of analysis pass, low address = %lx, high address = %lx\n",
(unsigned long) decode.low_address, (unsigned long) decode.high_address);
if (start_data_pc)
tx_printf ("\n%ld bytes of data in code from %lx to %lx\n",
(unsigned long) (end_data_pc - start_data_pc),
(unsigned long) start_data_pc, (unsigned long) end_data_pc);
if ((decode.low_address - code_base) >= story_scaler) {
tx_printf ("\n%ld bytes of data before code from %lx to %lx\n",
(unsigned long) (decode.low_address - code_base),
(unsigned long) code_base, (unsigned long) decode.low_address);
if (option_dump) {
tx_printf ("\n[Start of data");
if (option_labels == 0)
tx_printf (" at %lx", (unsigned long) code_base);
tx_printf ("]\n\n");
dump_data (code_base, decode.low_address - 1);
tx_printf ("\n[End of data");
if (option_labels == 0)
tx_printf (" at %lx", (unsigned long) (decode.low_address - 1));
tx_printf ("]\n");
}
}
if (option_labels)
renumber_cref (routines_base);
decode.first_pass = 0;
decode_program ();
decode_strings (decode.pc);
#endif
close_story ();
}/* process_story */
/* decode_program - Decode Z code in two passes */
#ifdef __STDC__
static void decode_program (void)
#else
static void decode_program ()
#endif
{
unsigned long pc, low_pc, high_pc, prev_low_pc, prev_high_pc;
int i, flag, vars;
if (decode.first_pass) {
if (decode.pc < decode.initial_pc) {
/* Scan for low routines */
decode.pc = ROUND_CODE (decode.pc);
for (pc = decode.pc, flag = 0; pc < decode.initial_pc && flag == 0; pc += code_scaler) {
for (vars = (char) read_data_byte (&pc); vars < 0 || vars > 15; vars = (char) read_data_byte (&pc))
pc = ROUND_CODE (pc);
decode.pc = pc - 1;
for (i = 0, flag = 1; i < 3 && flag; i++) {
pcindex = 0;
decode.pc = ROUND_CODE (decode.pc);
if (decode_routine () != END_OF_ROUTINE || pcindex)
flag = 0;
}
decode.pc = pc - 1;
}
if (flag && (unsigned int) header.version < V5) {
pc = decode.pc;
vars = (char) read_data_byte (&pc);
low_pc = decode.pc;
for (pc = pc + (vars * 2) - 1, flag = 0; pc >= low_pc && flag == 0; pc -= story_scaler) {
decode.pc = pc;
for (i = 0, flag = 1; i < 3 && flag; i++) {
pcindex = 0;
decode.pc = ROUND_CODE (decode.pc);
if (decode_routine () != END_OF_ROUTINE || pcindex)
flag = 0;
}
decode.pc = pc;
}
}
if (flag == 0 || decode.pc > decode.initial_pc)
decode.pc = decode.initial_pc;
}
/* Fill in middle routines */
decode.low_address = decode.pc;
decode.high_address = decode.pc;
start_data_pc = 0;
end_data_pc = 0;
do {
if (option_labels) {
free_cref (routines_base);
routines_base = NULL;
}
prev_low_pc = decode.low_address;
prev_high_pc = decode.high_address;
flag = 0;
pcindex = 0;
low_pc = decode.low_address;
high_pc = decode.high_address;
pc = decode.pc = decode.low_address;
while (decode.pc <= high_pc || decode.pc <= decode.initial_pc) {
if (start_data_pc == decode.pc)
decode.pc = end_data_pc;
if (decode_routine () != END_OF_ROUTINE) {
if (start_data_pc == 0)
start_data_pc = decode.pc;
flag = 1;
end_data_pc = 0;
pcindex = 0;
pc = ROUND_CODE (pc);
do {
pc += code_scaler;
vars = (char) read_data_byte (&pc);
pc--;
} while (vars < 0 || vars > 15);
decode.pc = pc;
} else {
if (pc < decode.initial_pc && decode.pc > decode.initial_pc) {
pc = decode.pc = decode.initial_pc;
decode.low_address = low_pc;
decode.high_address = high_pc;
} else {
if (start_data_pc && end_data_pc == 0)
end_data_pc = pc;
pc = ROUND_CODE (decode.pc);
if (flag == 0) {
low_pc = decode.low_address;
high_pc = decode.high_address;
}
}
}
}
decode.low_address = low_pc;
decode.high_address = high_pc;
} while (low_pc < prev_low_pc || high_pc > prev_high_pc);
/* Scan for high routines */
pc = decode.pc;
while (decode_routine () == END_OF_ROUTINE) {
decode.high_address = pc;
pc = decode.pc;
}
} else {
tx_printf ("\n[Start of code");
if (option_labels == 0)
tx_printf (" at %lx", (unsigned long) decode.low_address);
tx_printf ("]\n");
for (decode.pc = decode.low_address;
decode.pc <= decode.high_address; )
(void) decode_routine ();
tx_printf ("\n[End of code");
if (option_labels == 0)
tx_printf (" at %lx", (unsigned long) decode.pc);
tx_printf ("]\n");
}
}/* decode_program */
/* decode_routine - Decode a routine from start address to last instruction */
#ifdef __STDC__
static int decode_routine (void)
#else
static int decode_routine ()
#endif
{
unsigned long old_pc, old_start;
cref_item_t *cref_item;
int vars, status, i, locals;
if (decode.first_pass) {
cref_item = NULL;
if (option_labels)
cref_item = current_routine;
old_start = start_of_routine;
locals = locals_count;
old_pc = decode.pc;
decode.pc = ROUND_CODE (decode.pc);
vars = read_data_byte (&decode.pc);
if (vars >= 0 && vars <= 15) {
if (option_labels)
add_routine (decode.pc - 1);
locals_count = vars;
if ((unsigned int) header.version < V5)
for (; vars; vars--)
(void) read_data_word (&decode.pc);
start_of_routine = decode.pc;
if (decode_code () == END_OF_ROUTINE)
return (END_OF_ROUTINE);
if (option_labels)
current_routine = cref_item;
start_of_routine = old_start;
locals_count = locals;
}
decode.pc = old_pc;
if ((status = decode_code ()) != END_OF_ROUTINE) {
decode.pc = old_pc;
} else {
pctable[pcindex++] = old_pc;
if (pcindex == MAX_PCS) {
(void) fprintf (stderr, "\nFatal: too many orphan code fragments\n");
exit (EXIT_FAILURE);
}
}
} else {
if (decode.pc == start_data_pc) {
if (option_dump) {
tx_printf ("\n[Start of data");
if (option_labels == 0)
tx_printf (" at %lx", (unsigned long) start_data_pc);
tx_printf ("]\n\n");
dump_data (start_data_pc, end_data_pc - 1);
tx_printf ("\n[End of data");
if (option_labels == 0)
tx_printf (" at %lx", (unsigned long) (end_data_pc - 1));
tx_printf ("]\n");
}
decode.pc = end_data_pc;
}
for (i = 0; i < pcindex && decode.pc != pctable[i]; i++)
;
if (i == pcindex) {
decode.pc = ROUND_CODE (decode.pc);
start_of_routine = decode.pc;
vars = read_data_byte (&decode.pc);
if (option_labels) {
tx_printf ("%soutine %c%04d, %d local",
(decode.pc - 1 == decode.initial_pc) ? "\nMain r" : "\nR",
(option_inform) ? 'r' : 'R',
(int) lookup_routine (decode.pc - 1, 1),
(int) vars);
} else {
tx_printf ("%soutine %lx, %d local",
(decode.pc - 1 == decode.initial_pc) ? "\nMain r" : "\nR",
(unsigned long) (decode.pc - 1),
(int) vars);
}
if (vars != 1)
tx_printf ("s");
if ((unsigned int) header.version < V5) {
tx_printf (" (");
tx_fix_margin (1);
for (; vars; vars--) {
tx_printf ("%04x", (unsigned int) read_data_word (&decode.pc));
if (vars > 1)
tx_printf (", ");
}
tx_fix_margin (0);
tx_printf (")");
}
tx_printf ("\n");
lookup_verb (start_of_routine);
tx_printf ("\n");
} else
tx_printf ("\norphan code fragment:\n\n");
status = decode_code ();
}
return (status);
}/* decode_routine */
/* decode_code - grab opcode and determine the class */
#ifdef __STDC__
static int decode_code (void)
#else
static int decode_code ()
#endif
{
int status;
int label;
decode.high_pc = decode.pc;
do {
if (decode.first_pass == 0) {
if (option_labels) {
label = lookup_label (decode.pc, 0);
if (label != 0)
tx_printf ("%c%04d: ", (option_inform) ? 'l' : 'L', (int) label);
else
tx_printf (" ");
} else
tx_printf ("%5lx: ", (unsigned long) decode.pc);
}
opcode.opcode = read_data_byte (&decode.pc);
if ((unsigned int) header.version > V4 && opcode.opcode == 0xbe) {
opcode.opcode = read_data_byte (&decode.pc);
opcode.class = EXTENDED_OPERAND;
} else if (opcode.opcode < 0x80)
opcode.class = TWO_OPERAND;
else
if (opcode.opcode < 0xb0)
opcode.class = ONE_OPERAND;
else
if (opcode.opcode < 0xc0)
opcode.class = ZERO_OPERAND;
else
opcode.class = VARIABLE_OPERAND;
status = decode_opcode ();
} while (status == END_OF_INSTRUCTION);
return (status);
}/* decode_code */
/* decode_opcode - Check and decode the opcode itself */
#define caseline(opc, text, par1, par2, par3, par4, extra, type) \
case opc: return (decode_operands (text, par1, par2, par3, par4, extra, type))
#ifdef __STDC__
static int decode_opcode (void)
#else
static int decode_opcode ()
#endif
{
int code;
code = opcode.opcode;
switch (opcode.class) {
case EXTENDED_OPERAND:
code &= 0x3f;
switch (code) {
caseline (0x00, "SAVE", LOW_ADDR, NUMBER, LOW_ADDR, NIL, STORE, PLAIN);
caseline (0x01, "RESTORE", LOW_ADDR, NUMBER, LOW_ADDR, NIL, STORE, PLAIN);
caseline (0x02, "LOG_SHIFT", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x03, "ART_SHIFT", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x04, "SET_FONT", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x05, "DRAW_PICTURE", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x06, "PICTURE_DATA", NUMBER, LOW_ADDR, NIL, NIL, BRANCH, PLAIN);
caseline (0x07, "ERASE_PICTURE", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x08, "SET_MARGINS", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x09, "SAVE_UNDO", NIL, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x0A, "RESTORE_UNDO", NIL, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x10, "MOVE_WINDOW", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x11, "WINDOW_SIZE", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x12, "WINDOW_STYLE", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x13, "GET_WIND_PROP", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x14, "SCROLL_WINDOW", NUMBER, NUMBER, NIL, NIL, NONE, PLAIN);
caseline (0x15, "POP_STACK", NUMBER, LOW_ADDR, NIL, NIL, NONE, PLAIN);
caseline (0x16, "READ_MOUSE", LOW_ADDR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x17, "MOUSE_WINDOW", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x18, "PUSH_STACK", NUMBER, LOW_ADDR, NIL, NIL, BRANCH, PLAIN);
caseline (0x19, "PUT_WIND_PROP", NUMBER, NUMBER, ANYTHING, NIL, NONE, PLAIN);
caseline (0x1A, "PRINT_FORM", LOW_ADDR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x1B, "MAKE_MENU", NUMBER, LOW_ADDR, NIL, NIL, BRANCH, PLAIN);
caseline (0x1C, "PICTURE_TABLE", LOW_ADDR, NIL, NIL, NIL, NONE, PLAIN);
default:
return (decode_operands ("ILLEGAL", NIL, NIL, NIL, NIL, NONE, ILLEGAL));
}
case TWO_OPERAND:
code &= 0x1f;
case VARIABLE_OPERAND:
code &= 0x3f;
switch (code) {
caseline (0x01, "JE", ANYTHING, ANYTHING, ANYTHING, ANYTHING, BRANCH, PLAIN);
caseline (0x02, "JL", NUMBER, NUMBER, NIL, NIL, BRANCH, PLAIN);
caseline (0x03, "JG", NUMBER, NUMBER, NIL, NIL, BRANCH, PLAIN);
caseline (0x04, "DEC_CHK", VAR, NUMBER, NIL, NIL, BRANCH, PLAIN);
caseline (0x05, "INC_CHK", VAR, NUMBER, NIL, NIL, BRANCH, PLAIN);
caseline (0x06, "JIN", OBJECT, OBJECT, NIL, NIL, BRANCH, PLAIN);
caseline (0x07, "TEST", NUMBER, NUMBER, NIL, NIL, BRANCH, PLAIN);
caseline (0x08, "OR", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x09, "AND", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x0A, "TEST_ATTR", OBJECT, ATTRNUM, NIL, NIL, BRANCH, PLAIN);
caseline (0x0B, "SET_ATTR", OBJECT, ATTRNUM, NIL, NIL, NONE, PLAIN);
caseline (0x0C, "CLEAR_ATTR", OBJECT, ATTRNUM, NIL, NIL, NONE, PLAIN);
caseline (0x0D, "STORE", VAR, ANYTHING, NIL, NIL, NONE, PLAIN);
caseline (0x0E, "INSERT_OBJ", OBJECT, OBJECT, NIL, NIL, NONE, PLAIN);
caseline (0x0F, "LOADW", LOW_ADDR, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x10, "LOADB", LOW_ADDR, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x11, "GET_PROP", OBJECT, PROPNUM, NIL, NIL, STORE, PLAIN);
caseline (0x12, "GET_PROP_ADDR", OBJECT, PROPNUM, NIL, NIL, STORE, PLAIN);
caseline (0x13, "GET_NEXT_PROP", OBJECT, PROPNUM, NIL, NIL, STORE, PLAIN);
caseline (0x14, "ADD", LOW_ADDR, LOW_ADDR, NIL, NIL, STORE, PLAIN);
caseline (0x15, "SUB", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x16, "MUL", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x17, "DIV", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x18, "MOD", NUMBER, NUMBER, NIL, NIL, STORE, PLAIN);
caseline (0x21, "STOREW", LOW_ADDR, NUMBER, ANYTHING, NIL, NONE, PLAIN);
caseline (0x22, "STOREB", LOW_ADDR, NUMBER, ANYTHING, NIL, NONE, PLAIN);
caseline (0x23, "PUT_PROP", OBJECT, NUMBER, ANYTHING, NIL, NONE, PLAIN);
caseline (0x25, "PRINT_CHAR", PCHAR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x26, "PRINT_NUM", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x27, "RANDOM", NUMBER, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x28, "PUSH", ANYTHING, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2A, "SPLIT_WINDOW", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2B, "SET_WINDOW", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x33, "OUTPUT_STREAM", PATTR, LOW_ADDR, NUMBER, NIL, NONE, PLAIN);
caseline (0x34, "INPUT_STREAM", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x35, "SOUND_EFFECT", NUMBER, NUMBER, NUMBER, ROUTINE, NONE, PLAIN);
default:
switch ((unsigned int) header.version) {
case V1:
case V2:
case V3:
switch (code) {
caseline (0x20, "CALL", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x24, "READ", LOW_ADDR, LOW_ADDR, NIL, NIL, NONE, PLAIN);
caseline (0x29, "PULL", VAR, NIL, NIL, NIL, NONE, PLAIN);
}
case V4:
switch (code) {
caseline (0x19, "CALL_2S", ROUTINE, ANYTHING, NIL, NIL, STORE, CALL);
caseline (0x20, "CALL_VS", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x24, "READ", LOW_ADDR, LOW_ADDR, NUMBER, ROUTINE, NONE, PLAIN);
caseline (0x29, "PULL", VAR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2C, "CALL_VS2", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x2D, "ERASE_WINDOW", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2E, "ERASE_LINE", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2F, "SET_CURSOR", NUMBER, NUMBER, NIL, NIL, NONE, PLAIN);
caseline (0x31, "SET_TEXT_STYLE", VATTR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x32, "BUFFER_MODE", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x36, "READ_CHAR", NUMBER, NUMBER, ROUTINE, NIL, STORE, PLAIN);
caseline (0x37, "SCAN_TABLE", ANYTHING, LOW_ADDR, NUMBER, NUMBER, BOTH, PLAIN);
}
case V5:
case V7:
case V8:
switch (code) {
caseline (0x19, "CALL_2S", ROUTINE, ANYTHING, NIL, NIL, STORE, CALL);
caseline (0x1A, "CALL_2N", ROUTINE, ANYTHING, NIL, NIL, NONE, CALL);
caseline (0x1B, "SET_COLOUR", NUMBER, NUMBER, NIL, NIL, NONE, PLAIN);
caseline (0x20, "CALL_VS", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x24, "READ", LOW_ADDR, LOW_ADDR, NUMBER, ROUTINE, STORE, PLAIN);
caseline (0x29, "PULL", VAR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2C, "CALL_VS2", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x2D, "ERASE_WINDOW", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2E, "ERASE_LINE", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2F, "SET_CURSOR", NUMBER, NUMBER, NIL, NIL, NONE, PLAIN);
caseline (0x31, "SET_TEXT_STYLE", VATTR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x32, "BUFFER_MODE", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x36, "READ_CHAR", NUMBER, NUMBER, ROUTINE, NIL, STORE, PLAIN);
caseline (0x37, "SCAN_TABLE", ANYTHING, LOW_ADDR, NUMBER, NUMBER, BOTH, PLAIN);
caseline (0x39, "CALL_VN", ROUTINE, ANYTHING, ANYTHING, ANYTHING, NONE, CALL);
caseline (0x3A, "CALL_VN2", ROUTINE, ANYTHING, ANYTHING, ANYTHING, NONE, CALL);
caseline (0x3B, "TOKENISE", LOW_ADDR, LOW_ADDR, LOW_ADDR, NUMBER, NONE, PLAIN);
caseline (0x3C, "ENCODE_TEXT", LOW_ADDR, NUMBER, NUMBER, LOW_ADDR, NONE, PLAIN);
caseline (0x3D, "COPY_TABLE", LOW_ADDR, LOW_ADDR, NUMBER, NIL, NONE, PLAIN);
caseline (0x3E, "PRINT_TABLE", LOW_ADDR, NUMBER, NUMBER, NUMBER, NONE, PLAIN);
caseline (0x3F, "CHECK_ARG_COUNT", NUMBER, NIL, NIL, NIL, BRANCH, PLAIN);
}
case V6:
switch (code) {
caseline (0x19, "CALL_2S", ROUTINE, ANYTHING, NIL, NIL, STORE, CALL);
caseline (0x1A, "CALL_2N", ROUTINE, ANYTHING, NIL, NIL, NONE, CALL);
caseline (0x1B, "SET_COLOUR", NUMBER, NUMBER, NIL, NIL, NONE, PLAIN);
caseline (0x1C, "THROW", ANYTHING, NUMBER, NIL, NIL, NONE, PLAIN);
caseline (0x20, "CALL_VS", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x24, "READ", LOW_ADDR, LOW_ADDR, NUMBER, ROUTINE, STORE, PLAIN);
caseline (0x29, "PULL", LOW_ADDR, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x2C, "CALL_VS2", ROUTINE, ANYTHING, ANYTHING, ANYTHING, STORE, CALL);
caseline (0x2D, "ERASE_WINDOW", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2E, "ERASE_LINE", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x2F, "SET_CURSOR", NUMBER, NUMBER, NUMBER, NIL, NONE, PLAIN);
caseline (0x30, "GET_CURSOR", LOW_ADDR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x31, "SET_TEXT_STYLE", VATTR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x32, "BUFFER_MODE", NUMBER, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x36, "READ_CHAR", NUMBER, NUMBER, ROUTINE, NIL, STORE, PLAIN);
caseline (0x37, "SCAN_TABLE", ANYTHING, LOW_ADDR, NUMBER, NUMBER, BOTH, PLAIN);
caseline (0x38, "NOT", NUMBER, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x39, "CALL_VN", ROUTINE, ANYTHING, ANYTHING, ANYTHING, NONE, CALL);
caseline (0x3A, "CALL_VN2", ROUTINE, ANYTHING, ANYTHING, ANYTHING, NONE, CALL);
caseline (0x3B, "TOKENISE", LOW_ADDR, LOW_ADDR, LOW_ADDR, NUMBER, NONE, PLAIN);
caseline (0x3C, "ENCODE_TEXT", LOW_ADDR, NUMBER, NUMBER, LOW_ADDR, NONE, PLAIN);
caseline (0x3D, "COPY_TABLE", LOW_ADDR, NUMBER, LOW_ADDR, NIL, NONE, PLAIN);
caseline (0x3E, "PRINT_TABLE", LOW_ADDR, NUMBER, NUMBER, NUMBER, NONE, PLAIN);
caseline (0x3F, "CHECK_ARG_COUNT", NUMBER, NIL, NIL, NIL, BRANCH, PLAIN);
}
}
return (decode_operands ("ILLEGAL", NIL, NIL, NIL, NIL, NONE, ILLEGAL));
}
case ONE_OPERAND:
code &= 0x0f;
switch (code) {
caseline (0x00, "JZ", NUMBER, NIL, NIL, NIL, BRANCH, PLAIN);
caseline (0x01, "GET_SIBLING", OBJECT, NIL, NIL, NIL, BOTH, PLAIN);
caseline (0x02, "GET_CHILD", OBJECT, NIL, NIL, NIL, BOTH, PLAIN);
caseline (0x03, "GET_PARENT", OBJECT, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x04, "GET_PROP_LEN", LOW_ADDR, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x05, "INC", VAR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x06, "DEC", VAR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x07, "PRINT_ADDR", LOW_ADDR, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x09, "REMOVE_OBJ", OBJECT, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x0A, "PRINT_OBJ", OBJECT, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x0B, "RET", ANYTHING, NIL, NIL, NIL, NONE, RETURN);
caseline (0x0C, "JUMP", LABEL, NIL, NIL, NIL, NONE, RETURN);
caseline (0x0D, "PRINT_PADDR", STATIC, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x0E, "LOAD", VAR, NIL, NIL, NIL, STORE, PLAIN);
default:
switch ((unsigned int) header.version) {
case V1:
case V2:
case V3:
switch (code) {
caseline (0x0F, "NOT", NUMBER, NIL, NIL, NIL, STORE, PLAIN);
}
case V4:
switch (code) {
caseline (0x08, "CALL_1S", ROUTINE, NIL, NIL, NIL, STORE, CALL);
caseline (0x0F, "NOT", NUMBER, NIL, NIL, NIL, STORE, PLAIN);
}
case V5:
case V6:
case V7:
case V8:
switch (code) {
caseline (0x08, "CALL_1S", ROUTINE, NIL, NIL, NIL, STORE, CALL);
caseline (0x0F, "CALL_1N", ROUTINE, NIL, NIL, NIL, NONE, CALL);
}
}
return (decode_operands ("ILLEGAL", NIL, NIL, NIL, NIL, NONE, ILLEGAL));
}
case ZERO_OPERAND:
code &= 0x0f;
switch (code) {
caseline (0x00, "RTRUE", NIL, NIL, NIL, NIL, NONE, RETURN);
caseline (0x01, "RFALSE", NIL, NIL, NIL, NIL, NONE, RETURN);
caseline (0x02, "PRINT", NIL, NIL, NIL, NIL, TEXT, PLAIN);
caseline (0x03, "PRINT_RET", NIL, NIL, NIL, NIL, TEXT, RETURN);
caseline (0x04, "NOP", NIL, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x07, "RESTART", NIL, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x08, "RET_POPPED", NIL, NIL, NIL, NIL, NONE, RETURN);
caseline (0x0A, "QUIT", NIL, NIL, NIL, NIL, NONE, RETURN);
caseline (0x0B, "NEW_LINE", NIL, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x0D, "VERIFY", NIL, NIL, NIL, NIL, BRANCH, PLAIN);
default:
switch ((unsigned int) header.version) {
case V1:
case V2:
case V3:
switch (code) {
caseline (0x05, "SAVE", NIL, NIL, NIL, NIL, BRANCH, PLAIN);
caseline (0x06, "RESTORE", NIL, NIL, NIL, NIL, BRANCH, PLAIN);
caseline (0x09, "POP", NIL, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x0C, "SHOW_STATUS", NIL, NIL, NIL, NIL, NONE, PLAIN);
}
case V4:
switch (code) {
caseline (0x09, "POP", NIL, NIL, NIL, NIL, NONE, PLAIN);
caseline (0x05, "SAVE", NIL, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x06, "RESTORE", NIL, NIL, NIL, NIL, STORE, PLAIN);
}
case V5:
case V7:
case V8:
switch (code) {
caseline (0x09, "CATCH", NIL, NIL, NIL, NIL, STORE, PLAIN);
/* From a bug in Wishbringer V23 */
caseline (0x0C, "SHOW_STATUS", NIL, NIL, NIL, NIL, NONE, PLAIN);
}
case V6:
switch (code) {
caseline (0x09, "CATCH", NIL, NIL, NIL, NIL, STORE, PLAIN);
caseline (0x0F, "PIRACY", NIL, NIL, NIL, NIL, BRANCH, PLAIN);
}
}
return (decode_operands ("ILLEGAL", NIL, NIL, NIL, NIL, NONE, ILLEGAL));
}
default:
(void) fprintf (stderr, "\nFatal: bad class (%d)\n", (int) opcode.class);
exit (EXIT_FAILURE);
}
return (BAD_OPCODE);
}/* decode_opcode */
#undef caseline
/* decode_operands - Decode operands of opcode */
#ifdef __STDC__
static int decode_operands (const char *opcode_name, int par1, int par2, int par3, int par4, int extra, int type)
#else
static int decode_operands (opcode_name, par1, par2, par3, par4, extra, type)
const char *opcode_name;
int par1;
int par2;
int par3;
int par4;
int extra;
int type;
#endif
{
size_t len;
int i, opers, status;
opcode.par[0] = par1;
opcode.par[1] = par2;
opcode.par[2] = par3;
opcode.par[3] = par4;
opcode.extra = extra;
opcode.type = type;
if (opcode.type == ILLEGAL)
return (BAD_OPCODE);
if (decode.first_pass) {
status = decode_parameters (&opers);
if (status)
return (BAD_OPCODE);
status = decode_extra ();
} else {
if (option_dump)
dump_opcode (decode.pc, opcode.opcode, opcode.class, opcode.par, opcode.extra);
if (option_inform) {
len = strlen (opcode_name);
for (i = 0; i < len; i++)
tx_printf ("%c", tolower (opcode_name[i]));
} else {
tx_printf (opcode_name);
len = strlen (opcode_name);
}
for (; len < 16; len++)
tx_printf (" ");
(void) decode_parameters (&opers);
if (opers > 0 && opcode.extra != NONE)
tx_printf (" ");
status = decode_extra ();
tx_printf ("\n");
}
if (decode.pc > decode.high_pc)
decode.high_pc = decode.pc;
return (status);
}/* decode_operands */
/* decode_parameters - Decode input parameters */