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discpu.cpp
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// discpu.cpp
#include "discpu.h"
#include "discmt.h"
// =====================================================
// class CPU
// =====================================================
CPU *curCpu = &generic; // pointer to current CPU
CPU *defCpu = &generic; // pointer to default CPU
CPU *cpu_list = NULL; // pointer to CPU list
uint8_t next_cpu_id = mCode; // next CPU ID to assign
// =====================================================
// register this disassembler in the list of disassemblers
void CPU::add_cpu()
{
// curCpu = this;
_id = next_cpu_id++;
// add new disassembler to the end of the linked list
// so they will appear in registration order
// (registration order will depend on link order of C++ constructors)
if (!cpu_list) {
// empty list
cpu_list = this;
} else {
// find last item in list
CPU *p = cpu_list;
while (p->_next) {
p = p->_next;
}
// add after last item
p->_next = this;
}
}
// =====================================================
void CPU::set_cur_cpu(CPU *cpu)
{
cpu->set_cur_cpu();
}
// =====================================================
void CPU::set_cur_cpu()
{
curCpu = this;
if (defCpu == &generic) {
set_def_cpu();
}
}
// =====================================================
void CPU::set_def_cpu(CPU *cpu)
{
cpu->set_def_cpu();
}
// =====================================================
void CPU::set_def_cpu()
{
defCpu = this;
// copy settings into generic
generic._dbopcd = _dbopcd;
generic._dwopcd = _dwopcd;
generic._dlopcd = _dlopcd;
generic._drwopcd = _drwopcd;
generic._endian = _endian;
generic._curpc = _curpc;
generic._hexchr = _hexchr;
generic._addrwid = _addrwid;
generic._usefcc = _usefcc;
}
// =====================================================
// find a disassembler in the list by name
class CPU *CPU::get_cpu(const char *s)
{
#if 0
if (strcasecmp(s, curCpu->_name)) {
return NULL;
} else {
return curCpu;
}
#else
for (class CPU *cpu = cpu_list; cpu; cpu = cpu->_next) {
if (strcasecmp(s, cpu->_name) == 0) {
return cpu;
}
}
return NULL;
#endif
}
// =====================================================
// find a disassembler in the list by id
class CPU *CPU::get_cpu(int id)
{
// if id is not for a disasssembler, use the generic disassembler
if (id < mCode) {
return &generic;
}
// find the CPU from the list
// could probably cache the last used one before searching the list
#if 0
if (id != curCpu->_id) {
return NULL;
} else {
return curCpu;
}
#else
for (class CPU *cpu = cpu_list; cpu; cpu = cpu->_next) {
if (id == cpu->_id) {
return cpu;
}
}
return NULL;
#endif
}
// =====================================================
// find a dissasembler in the list in order
// start with cpu = NULL, returns NULL at end of list
class CPU *CPU::next_cpu(class CPU *cpu)
{
#if 0
// currently only supporting curCpu
if (cpu) {
return NULL;
} else {
return curCpu;
}
#else
if (cpu) {
// return next CPU in list
return cpu->_next;
} else {
// return start of list
return cpu_list;
}
#endif
}
// =====================================================
void CPU::show_list()
{
const char *file = "";
printf("Supported CPU types:");
for (CPU *cpu = CPU::next_cpu(NULL); cpu; cpu = CPU::next_cpu(cpu)) {
if (strcmp(file, cpu->_file)) {
printf("\n");
// print new file name
// printf("%s: \"%s\"", cpu->_file, cpu->_version);
printf(" %s:", cpu->_version);
file = cpu->_file;
}
// printf(" %-8s - %s\n", cpu->_name, cpu->_version);
printf(" %s", cpu->_name);
}
printf("\n");
}
// =====================================================
int CPU::ReadByte(addr_t addr) const
{
return rom.get_data(addr++);
}
// =====================================================
int CPU::ReadWord(addr_t addr) const
{
if (_endian) {
return ReadWordBE(addr);
} else {
return ReadWordLE(addr);
}
}
// =====================================================
int CPU::ReadRWord(addr_t addr) const
{
if (_endian) {
return ReadWordLE(addr);
} else {
return ReadWordBE(addr);
}
}
// =====================================================
int CPU::ReadWordBE(addr_t addr) const
{
return (rom.get_data(addr) << 8) | rom.get_data(addr+1);
}
// =====================================================
int CPU::ReadWordLE(addr_t addr) const
{
return rom.get_data(addr) | (rom.get_data(addr+1) << 8);
}
// =====================================================
int CPU::ReadLong(addr_t addr) const
{
if (_endian) {
return ReadLongBE(addr);
} else {
return ReadLongLE(addr);
}
}
// =====================================================
int CPU::ReadRLong(addr_t addr) const
{
if (_endian) {
return ReadLongLE(addr);
} else {
return ReadLongBE(addr);
}
}
// =====================================================
int CPU::ReadLongBE(addr_t addr) const
{
return (rom.get_data(addr) << 24) | (rom.get_data(addr+1) << 16) |
(rom.get_data(addr+2) << 8) | rom.get_data(addr+3);
}
// =====================================================
int CPU::ReadLongLE(addr_t addr) const
{
return rom.get_data(addr) | (rom.get_data(addr+1) << 8) |
(rom.get_data(addr+2) << 16) | (rom.get_data(addr+3) << 24);
}
// =====================================================
char *CPU::H2Str(uint8_t b, char *s) const
{
if (_hexchr == '$') {
sprintf(s, "$%.2X", b);
} else {
if (b > 0x9F) {
sprintf(s, "0%.2XH", b);
} else {
sprintf(s, "%.2XH", b);
}
}
return s;
}
// =====================================================
char *CPU::H4Str(uint16_t w, char *s) const
{
if (_hexchr == '$') {
sprintf(s, "$%.4X", w);
} else {
if (w > 0x9FFF) {
sprintf(s, "0%.4XH", w);
} else {
sprintf(s, "%.4XH", w);
}
}
return s;
}
// =====================================================
char *CPU::H6Str(uint32_t l, char *s) const
{
if (_hexchr == '$') {
sprintf(s, "$%.6X", l);
} else {
if (l > 0x9FFFFF) {
sprintf(s, "0%.6XH", l);
} else {
sprintf(s, "%.6XH", l);
}
}
return s;
}
// =====================================================
char *CPU::H8Str(uint32_t l, char *s) const
{
if (_hexchr == '$') {
sprintf(s, "$%.8X", l);
} else {
if (l > 0x9FFFFFFF) {
sprintf(s, "0%.8XH", l);
} else {
sprintf(s, "%.8XH", l);
}
}
return s;
}
// =====================================================
char *CPU::HxStr(uint32_t l, char *s) const
{
if (l > 0x00FFFFFF) {
return H8Str(l, s);
} else if (rom._base > 0x0000FFFF) {
return H6Str(l, s);
} else {
return H4Str(l, s);
}
}
// =====================================================
bool CPU::ref_label(addr_t addr, char *s, int &lfref, addr_t &refaddr) const
{
// common code for the various RefStr functions
s[0] = 0;
if (rom._base <= addr && addr <= rom.get_end() && addr != 0) {
lfref |= REFFLAG;
make_label(addr, s);
refaddr = addr;
// note that if the label wasn't actually flagged as a label,
// make_label will leave the string empty, but refaddr will still be set
}
// check if equate defined at this address
const char *str;
if ((str = equ.get_sym(addr))) {
strcpy(s, str);
}
return !s[0];
}
// =====================================================
char *CPU::RefStr2(addr_t addr, char *s, int &lfref, addr_t &refaddr) const
{
s[0] = 0;
if (ref_label(addr, s, lfref, refaddr)) {
H2Str(addr, s);
}
return s;
}
// =====================================================
char *CPU::RefStr4(addr_t addr, char *s, int &lfref, addr_t &refaddr) const
{
if (ref_label(addr, s, lfref, refaddr)) {
H4Str(addr, s);
}
return s;
}
// =====================================================
char *CPU::RefStr6(addr_t addr, char *s, int &lfref, addr_t &refaddr) const
{
if (ref_label(addr, s, lfref, refaddr)) {
H6Str(addr, s);
}
return s;
}
// =====================================================
char *CPU::RefStr8(addr_t addr, char *s, int &lfref, addr_t &refaddr) const
{
// check for an odd_code situation (odd addresses of Thumb code)
// This is only done in RefStr8 simply because that's
// the only place where it is needed.
bool odd = is_odd_code(addr);
if (odd) {
addr--;
}
if (ref_label(addr, s, lfref, refaddr)) {
H8Str(addr, s);
}
// append a trailing "+1" for the odd_code situation
if (odd) {
strcat(s, "+1");
}
return s;
}
// =====================================================
char *CPU::RefStr(addr_t addr, char *s, int &lfref, addr_t &refaddr) const
{
switch(_addrwid) {
default:
case ADDR_16:
return RefStr4(addr, s, lfref, refaddr);
case ADDR_24:
return RefStr6(addr, s, lfref, refaddr);
case ADDR_32:
return RefStr8(addr, s, lfref, refaddr);
}
return s;
}
// =====================================================
void CPU::make_label(addr_t addr, char *s) const
{
s[0] = 0;
char c = 0;
// check if external symbol defined at this address
const char *str;
if ((str = sym.get_sym(addr))) {
strcpy(s, str);
return;
}
// get label type for this address
switch(rom.get_attr(addr) & ATTR_LMASK) {
default: // no label
case ATTR_LNONE:
return;
case ATTR_LDATA:
c = 'D';
break;
case ATTR_LCODE:
c = 'L';
break;
case ATTR_LXXXX:
c = 'X';
break;
}
// concatenate address to label type
switch (defCpu->_addrwid) {
default:
case ADDR_16:
sprintf(s, "%c%.4X", c, (unsigned) addr);
break;
case ADDR_24:
case ADDR_32:
sprintf(s, "%c%.6X", c, (unsigned) addr);
break;
}
}
// =====================================================
// returns address of previous instruction, or zero if invalid
// (invalid means either before start of ROM or not from this CPU)
addr_t CPU::find_prev_instr(addr_t addr) const
{
// have to go back at least one byte
addr--;
while (addr >= rom._base) {
// look for previous instruction start
if (!rom.test_attr(addr, ATTR_CONT)) {
// ignore if wrong CPU
if (rom.get_type(addr) != _id) {
// it's not from this CPU
return 0;
}
// found the previous instruction from this CPU!
return addr;
}
// try next byte back
addr--;
}
return 0; // was at beginning of rom area
}
// =====================================================
// returns address of previous label, or zero if none found
addr_t CPU::find_prev_label(addr_t addr) const
{
while (addr >= rom._base) {
if (rom.test_attr(addr, ATTR_LMASK)) {
return addr;
}
addr--;
}
return 0; // previous label not found
}
// =====================================================
// class DisDefault
// =====================================================
DisDefault generic;
// =====================================================
DisDefault::DisDefault()
{
_file = __FILE__;
_name = "(none)";
_version = "";
_subtype = 0;
_next = NULL;
_id = 0;
_dbopcd = "DB";
_dwopcd = "DW";
_dlopcd = "DL";
_curpc = '$';
_endian = LITTLE_END;
_hexchr = 'H';
_addrwid = ADDR_16; // should be using defCpu!
_usefcc = false;
}
// =====================================================
void DisDefault::byte_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr);
char *p = parms;
strcpy(opcode, _dbopcd);
for (int i = 0; i < len; i++) {
if (i) {
p = stpcpy(p, ",");
}
H2Str(rom.get_data(addr++),p);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::word_dis_line(addr_t addr, char *opcode, char *parms, int &lfref, addr_t &refaddr) const
{
int len = rom.get_len(addr) / 2;
bool w1 = rom.get_type(addr) == mWord1;
char *p = parms;
strcpy(opcode, _dwopcd);
int w = ReadWord(addr);
if (w1) {
w++; // mWord1 reference address is w + 1
}
addr += 2;
RefStr4(w, p, lfref, refaddr);
p += strlen(p);
if (w1) {
strcat(p, "-1");
p += 2;
}
for (int i = 0; i < len - 1; i++) {
int w = ReadWord(addr);
addr += 2;
p = stpcpy(p, ",");
H4Str(w, p);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::rword_dis_line(addr_t addr, char *opcode, char *parms, int &lfref, addr_t &refaddr) const
{
int len = rom.get_len(addr) / 2;
char *p = parms;
// use DW reverse opcode if specified
if (_drwopcd) {
strcpy(opcode, _drwopcd);
} else {
strcpy(opcode, _dwopcd);
strcat(opcode, "*");
}
int w = ReadRWord(addr);
addr += 2;
RefStr4(w, p, lfref, refaddr);
p += strlen(p);
for (int i = 0; i < len - 1; i++) {
int w = ReadRWord(addr);
addr += 2;
p = stpcpy(p, ",");
H4Str(w, p);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::long_dis_line(addr_t addr, char *opcode, char *parms, int &lfref, addr_t &refaddr) const
{
int len = rom.get_len(addr) / 4;
char *p = parms;
strcpy(opcode, _dlopcd);
uint32_t w = ReadLong(addr);
addr += 4;
RefStr8(w, p, lfref, refaddr);
p += strlen(p);
for (int i = 0; i < len - 1; i++) {
uint32_t l = ReadLong(addr);
addr += 4;
p = stpcpy(p, ",");
H8Str(l, p);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::rlong_dis_line(addr_t addr, char *opcode, char *parms, int &lfref, addr_t &refaddr) const
{
int len = rom.get_len(addr) / 4;
char *p = parms;
strcpy(opcode, _dlopcd);
strcat(opcode, "*");
uint32_t w = ReadRLong(addr);
addr += 4;
RefStr8(w, p, lfref, refaddr);
p += strlen(p);
for (int i = 0; i < len - 1; i++) {
uint32_t l = ReadRLong(addr);
addr += 4;
p = stpcpy(p, ",");
H8Str(l, p);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::decw_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr) / 2;
char *p = parms;
strcpy(opcode, _dwopcd);
for (int i = 0; i < len; i++) {
int w = ReadWord(addr);
addr += 2;
if (i) {
p = stpcpy(p, ",");
}
sprintf(p, "%d", w);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::decl_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr) / 4;
char *p = parms;
strcpy(opcode, _dlopcd);
for (int i = 0; i < len; i++) {
uint32_t l = ReadLong(addr);
addr += 4;
if (i) {
p = stpcpy(p, ",");
}
sprintf(p, "%d", l);
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::ofs_dis_line(addr_t addr, char *opcode, char *parms, int &lfref, addr_t &refaddr) const
{
// if not exactly 2 bytes, disassemble as bytes and exit
int len = rom.get_len(addr);
if (len != 2) {
byte_dis_line(addr, opcode, parms);
return;
//printf(" *** addr=%.8X len=%d label not found ***\r\n", (int) addr, len); fflush(stdout); sleep(3);
}
// get previous label
addr_t label = find_prev_label(addr);
// no label found, disassemble as word and exit
// note: this will also fail if the label is at address zero
if (!addr) {
word_dis_line(addr, opcode, parms, lfref, refaddr);
return;
//printf(" *** addr=%.8X label=%.8X label not found ***\r\n", (int) addr, (int) label); fflush(stdout); sleep(3);
}
// get word in default endian
int w = ReadWord(addr);
addr += 2;
// sign-extend word
w = (int16_t) w;
// create disassembly line "DW <label+w> - <label>"
strcpy(opcode, _dwopcd); // DW
char *p = parms;
RefStr(label + w, p, lfref, refaddr); // label+w
p += strlen(p);
*p++ = '-'; // -
*p = 0;
int nolfref; // dummy to ignore ref of label
addr_t norefaddr;
RefStr(label, p, nolfref, norefaddr); // label
//printf(" *** ! addr=%.8X '%s %s' ***\r\n", (int) addr, opcode, parms);
}
// =====================================================
void DisDefault::hex_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr);
char *p = parms;
strcpy(opcode, "HEX");
for (int i = 0; i < len; i++) {
if (i) {
p = stpcpy(p, " ");
}
sprintf(p, "%.2X", ReadByte(addr++));
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::bin_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr);
char *p = parms;
strcpy(opcode, _dbopcd);
int typ = rom.get_type(addr);
for (int i = 0; i < len; i++) {
if (i) {
p = stpcpy(p, ",");
}
int b = rom.get_data(addr++);
switch (typ) {
default:
case mBin: // binary
for (int bit = 0x80; bit; bit >>= 1) {
*p++ = b & bit ? '1' : '0';
}
*p++ = 'B';
break;
case mBinX: // big-endian X
for (int bit = 0x80; bit; bit >>= 1) {
*p++ = b & bit ? 'X' : '_';
}
break;
case mBinO: // little-endian O
for (int bit = 0x01; bit <= 0x80; bit <<= 1) {
*p++ = b & bit ? 'O' : '_';
}
break;
}
*p = 0;
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
}
}
// =====================================================
void DisDefault::asc_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr);
enum {
none,
chr,
byte
};
int last_typ = none;
char quote = '"';
char *p = parms;
strcpy(opcode, _dbopcd);
if (_usefcc) {
// for Motorola style, use opcode FCC and change quote to '/'
strcpy(opcode, "FCC");
quote = '/';
}
for (int i = 0; i < len; i++) {
int c = rom.get_data(addr + i);
int typ = byte;
if (' ' <= c && c <= '~' && c != quote && c != '\\') {
typ = chr;
}
// put comma between changes and between bytes
if ((last_typ != none && typ != last_typ) ||
(last_typ == byte && typ == byte)) {
// close the quote from the previous string
if (last_typ == chr) {
*p++ = quote;
*p = 0;
}
// put comma between elements
*p++ = ',';
*p = 0;
}
if (last_typ != chr && typ == chr) {
// open the quote for the new string
if (typ == chr) {
*p++ = quote;
*p = 0;
}
}
if (typ == chr) {
*p++ = c;
*p = 0;
} else {
// FCC must start with a delimiter character!
if (_usefcc && i == 0) {
*p++ = quote;
*p++ = quote;
*p++ = ',';
*p = 0;
}
#if 1 // display ASCII characters with high bit set as 'c'+80H
if (' '+0x80 <= c && c <= '~'+0x80 && c != '\''+0x80
&& c != '\'' && c != '\\'+0x80) {
// 'c'+
sprintf(p, "'%c'+", c & 0x7F);
c = 0x80;
p += strlen(p);
}
#endif
H2Str(c, p);
}
p += strlen(p);
// avoid buffer overflow the lazy way
if (strlen(parms) > 200) {
strcpy(p, "...");
break;
}
last_typ = typ;
}
if (last_typ == chr) {
*p++ = quote;
*p = 0;
}
}
// =====================================================
/* Index is EBCDIC 1047 code point; value is ASCII platform equivalent */
const uint8_t ebcdic_table[] = {
/*_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F*/
0x00,0x01,0x02,0x03,0x9C,0x09,0x86,0x7F,0x97,0x8D,0x8E,0x0B,0x0C,0x0D,0x0E,0x0F,
0x10,0x11,0x12,0x13,0x9D,0x0A,0x08,0x87,0x18,0x19,0x92,0x8F,0x1C,0x1D,0x1E,0x1F,
0x80,0x81,0x82,0x83,0x84,0x85,0x17,0x1B,0x88,0x89,0x8A,0x8B,0x8C,0x05,0x06,0x07,
0x90,0x91,0x16,0x93,0x94,0x95,0x96,0x04,0x98,0x99,0x9A,0x9B,0x14,0x15,0x9E,0x1A,
0x20,0xA0,0xE2,0xE4,0xE0,0xE1,0xE3,0xE5,0xE7,0xF1,0xA2,0x2E,0x3C,0x28,0x2B,0x7C,
0x26,0xE9,0xEA,0xEB,0xE8,0xED,0xEE,0xEF,0xEC,0xDF,0x21,0x24,0x2A,0x29,0x3B,0x5E,
0x2D,0x2F,0xC2,0xC4,0xC0,0xC1,0xC3,0xC5,0xC7,0xD1,0xA6,0x2C,0x25,0x5F,0x3E,0x3F,
0xF8,0xC9,0xCA,0xCB,0xC8,0xCD,0xCE,0xCF,0xCC,0x60,0x3A,0x23,0x40,0x27,0x3D,0x22,
0xD8,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0xAB,0xBB,0xF0,0xFD,0xFE,0xB1,
0xB0,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,0xAA,0xBA,0xE6,0xB8,0xC6,0xA4,
0xB5,0x7E,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0xA1,0xBF,0xD0,0x5B,0xDE,0xAE,
0xAC,0xA3,0xA5,0xB7,0xA9,0xA7,0xB6,0xBC,0xBD,0xBE,0xDD,0xA8,0xAF,0x5D,0xB4,0xD7,
0x7B,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0xAD,0xF4,0xF6,0xF2,0xF3,0xF5,
0x7D,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,0x50,0x51,0x52,0xB9,0xFB,0xFC,0xF9,0xFA,0xFF,
0x5C,0xF7,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0xB2,0xD4,0xD6,0xD2,0xD3,0xD5,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0xB3,0xDB,0xDC,0xD9,0xDA,0x9F
/*_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F*/
};
void DisDefault::ebcdic_dis_line(addr_t addr, char *opcode, char *parms) const
{
int len = rom.get_len(addr);
enum {
none,
chr,
byte
};
int last_typ = none;
char quote = '"';
char *p = parms;
strcpy(opcode, "EBCDIC");