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bios_patcher.cxx
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/* -*- mode:C++; -*-
*
* bios_patcher.cxx
*
* author(s) : Shuichi TAKANO
* since 2016/09/10(Sat) 14:02:37
*/
#include <vector>
#include <stdint.h>
#include <fstream>
#include <stdio.h>
#include <algorithm>
#include <assert.h>
#include <set>
////////////////////////////////////////////////////////////////////////
bool getOption(char **argv, const char *f1, const char *f2, bool &flag)
{
const char *s = argv[0];
assert(f1 || f2);
if ((f1 && strcmp(s, f1) == 0) ||
(f2 && strcmp(s, f2) == 0))
{
flag = true;
return true;
}
return false;
}
template <class T, class Func>
bool getOption(int &argc, char **&argv,
const char *f1, const char *f2, Func func, T &ret)
{
const char *s = argv[0];
assert(f1 || f2);
size_t l1 = f1 ? strlen(f1) : 0;
size_t l2 = f2 ? strlen(f2) : 0;
size_t l = 0;
if (l1 && strncmp(s, f1, l1) == 0)
l = l1;
else if (l2 && strcmp(s, f2) == 0)
l = l2;
if (l)
{
if (s[l] == 0)
{
--argc;
++argv;
if (argc)
ret = func(argv[0]);
else
return false;
}
else
ret = func(s + l);
return true;
}
return false;
}
const char *getConstStr(const char *str)
{
return str;
}
template <class T>
struct StringBackInserter
{
T &strs_;
StringBackInserter(T &strs) : strs_(strs) {}
void operator=(const char *n) const
{
strs_.push_back(n);
}
};
template <class T>
const StringBackInserter<T> stringBackInserter(T &strs)
{
return StringBackInserter<T>(strs);
}
///////////////////////////////////////////////////////////////////////////////
const char *output_ = nullptr;
const char *rom_ = nullptr;
const char *bios_ = nullptr;
const char *biosPatch_ = nullptr;
const char *mapper_ = nullptr;
std::vector<std::string> addPages_;
std::vector<std::string> romPatches_;
std::vector<std::string> startKeys_;
bool reversePSGToneOrder_ = false;
bool analyzeCommandLine(int argc, char **argv)
{
--argc;
++argv;
while (argc > 0)
{
if (
!getOption(argc, argv, "-o", "--output", getConstStr, output_) &&
!getOption(argc, argv, "-r", "--rom", getConstStr, rom_) &&
!getOption(argc, argv, "-b", "--biosrom", getConstStr, bios_) &&
!getOption(argc, argv, "-p", "--biospatch", getConstStr, biosPatch_) &&
!getOption(argc, argv, "-m", "--mapper", getConstStr, mapper_) &&
!getOption(argv, "-t", "--rev_tone_order", reversePSGToneOrder_) &&
!getOption(argc, argv, nullptr, "--pagepair", getConstStr, stringBackInserter(addPages_)) &&
!getOption(argc, argv, nullptr, "--patch", getConstStr, stringBackInserter(romPatches_)) &&
!getOption(argc, argv, nullptr, "--stkey", getConstStr, stringBackInserter(startKeys_)) &&
true)
{
if (argc == 0)
return false;
const char *s = argv[0];
if (s[0] == '-' || s[0] == '/')
return false;
/* 普通 */
// if (!input_)
// input_ = s;
// else if (!output_)
// output_ = s;
// else
return false;
}
--argc;
++argv;
}
return true;
}
void printUsage(const char *cmd)
{
printf("%s\n", cmd);
printf("options :\n");
printf(" -o --output : output filename.sms\n");
printf(" -r --rom : input MSX rom filename\n");
printf(" -b --biosrom : MSX bios rom\n");
printf(" -p --biospatch : bios patch bin\n");
printf(" -m --mapper : mapper type\n");
printf(" -t --rev_tone_order : reverse PSG tone set order\n");
printf(" --pagepair [xxyy] : add mapper page pair (2hex)\n");
printf(" --patch [addr:vv] : add rom patch\n");
printf(" --stkey [name] : add start button key\n");
}
//////////////////////////////////////////////////////////////////////
void load(std::vector<uint8_t> &dst, const char *filename)
{
FILE *fp = fopen(filename, "rb");
if (!fp)
{
printf("load error %s\n", filename);
exit(-1);
}
uint8_t buf[1000];
while (1)
{
auto r = fread(buf, 1, sizeof(buf), fp);
if (r == 0)
break;
dst.insert(dst.end(), buf, buf + r);
}
printf("%zd bytes loaded. %s.\n",
dst.size(), filename);
fclose(fp);
}
void save(const std::vector<uint8_t> &src, const char *filename)
{
FILE *fp = fopen(filename, "wb");
if (!fp)
{
printf("save error %s\n", filename);
exit(-1);
}
fwrite(src.data(), 1, src.size(), fp);
fclose(fp);
printf("%s saved.\n", filename);
}
template <class T1, class T2>
void replaceArea(T1 &dst, const T2 &src,
int startOfs, int endOfs)
{
memcpy(dst.data() + startOfs,
src.data() + startOfs, endOfs - startOfs);
}
template <class T>
void replacePattern2(T &data, int p0, int p1, int r0, int r1)
{
int size = (int)data.size() - 1;
// int size = 0x8000 - 1; // biosだけ。手抜き
for (int i = 0; i < size; ++i)
{
if (data[i + 0] == p0 &&
data[i + 1] == p1)
{
data[i + 0] = r0;
data[i + 1] = r1;
}
}
}
template <class T>
void replacePattern3(T &data,
int p0, int p1, int p2,
int r0, int r1, int r2)
{
int size = (int)data.size() - 2;
// int size = 0x8000 - 2; // biosだけ。手抜き
for (int i = 0; i < size; ++i)
{
if (data[i + 0] == p0 &&
data[i + 1] == p1 &&
data[i + 2] == p2)
{
data[i + 0] = r0;
data[i + 1] = r1;
data[i + 2] = r2;
}
}
}
template <class T>
void writeBytes(T &data, int ofs, size_t size, const uint8_t *buf)
{
std::copy(buf, buf + size, data.begin() + ofs);
}
int maskToCount(int m)
{
if (m < 0)
return -1;
return m;
}
int rotL(int v)
{
if (v < 0)
return -1;
return ((v << 1) & 255) | ((v >> 7) & 1);
}
int add(int v, int i)
{
if (v < 0)
return -1;
return (v + i) & 255;
}
struct MEGAROMAnalyzer
{
struct PagePair
{
int pages_[2] = {-1, -1};
bool isValid() const
{
return pages_[0] >= 0 || pages_[1] >= 0;
}
friend bool operator<(const PagePair &a, const PagePair &b)
{
if (a.pages_[0] != b.pages_[0])
return a.pages_[0] < b.pages_[0];
return a.pages_[1] < b.pages_[1];
}
};
struct BankInfo
{
std::set<int> certainly_;
std::set<int> perhaps_;
};
enum MapperType
{
MAPPER_ASCII8KB,
MAPPER_ASCII16KB,
MAPPER_KONAMI8KB,
MAPPER_KONAMI8KB_SCC,
};
int getBankSize(MapperType mapper)
{
switch (mapper)
{
default:
case MAPPER_ASCII8KB:
return 8 * 1024;
case MAPPER_ASCII16KB:
return 16 * 1024;
case MAPPER_KONAMI8KB:
return 8 * 1024;
case MAPPER_KONAMI8KB_SCC:
return 8 * 1024;
}
return 0;
}
struct Record
{
struct Entry
{
int ofs_ = 0;
int bank_ = 0;
int page_ = -1; // 確実なページ番号
int pageOfs_ = 0; // オフセットが分かるとき
int pageOfsCount_ = -1; // オフセットからのページ数が分かるとき
void dump(int page, int bankSize)
{
printf("%08x:p%02x:+%04x: bank%d, ",
page * bankSize + ofs_,
page, ofs_,
bank_);
if (page_ >= 0)
printf("page %02x", page_);
else
{
printf("page i + %02x", pageOfs_);
if (pageOfsCount_ >= 0)
printf(" ~ %d", pageOfsCount_);
}
printf("\n");
}
};
std::vector<Entry> entries_;
int page_ = 0;
int ofs_ = 0;
void check(MapperType mapper, int ofs, const uint8_t *rom,
std::set<std::pair<int, int>> &fileOffsets)
{
int bankSize = 8192;
int bankAddr[4] = {};
int bankReg[4] = {};
int bankCount = 4;
switch (mapper)
{
default:
case MAPPER_ASCII8KB:
bankSize = 8 * 1024;
bankCount = 4;
bankAddr[0] = 0x4000;
bankAddr[1] = 0x6000;
bankAddr[2] = 0x8000;
bankAddr[3] = 0xa000;
bankReg[0] = 0x6000;
bankReg[1] = 0x6800;
bankReg[2] = 0x7000;
bankReg[3] = 0x7800;
break;
case MAPPER_ASCII16KB:
bankSize = 16 * 1024;
bankCount = 2;
bankAddr[0] = 0x4000;
bankAddr[1] = 0x8000;
bankReg[0] = 0x6000;
bankReg[1] = 0x7000;
break;
case MAPPER_KONAMI8KB:
bankSize = 8 * 1024;
bankCount = 4;
bankAddr[0] = 0x4000;
bankAddr[1] = 0x6000;
bankAddr[2] = 0x8000;
bankAddr[3] = 0xa000;
bankReg[0] = -1;
bankReg[1] = 0x6000;
bankReg[2] = 0x8000;
bankReg[3] = 0xa000;
break;
case MAPPER_KONAMI8KB_SCC:
bankSize = 8 * 1024;
bankCount = 4;
bankAddr[0] = 0x4000;
bankAddr[1] = 0x6000;
bankAddr[2] = 0x8000;
bankAddr[3] = 0xa000;
bankReg[0] = 0x5000;
bankReg[1] = 0x7000;
bankReg[2] = 0x9000;
bankReg[3] = 0xb000;
break;
}
page_ = ofs / bankSize;
int pageOfs = page_ * bankSize;
ofs -= pageOfs;
ofs_ = ofs;
rom += pageOfs;
int regA = -1;
int displaceA = 0;
int maskA = -1;
int jpCount = 0;
int jpAddr = -1;
while (ofs < bankSize && jpCount < 2)
{
auto c = rom[ofs];
switch (c)
{
case 0xc6: // add #imm
if (bankSize - ofs < 2)
return;
{
int imm = rom[ofs + 1];
regA = add(regA, imm);
displaceA = add(displaceA, imm);
// mask は維持
}
ofs += 2;
break;
case 0xe6: // and #imm
if (bankSize - ofs < 2)
return;
maskA = rom[ofs + 1];
if (regA > 0)
regA = regA & maskA;
displaceA = 0;
ofs += 2;
break;
case 0x07: // rlca
regA = rotL(regA);
maskA = rotL(maskA);
displaceA = 0;
++ofs;
break;
case 0x3c: // inc a
regA = add(regA, 1);
displaceA = add(displaceA, 1);
// mask は維持
++ofs;
break;
case 0x3e: // ld a, #imm
if (bankSize - ofs < 2)
return;
regA = rom[ofs + 1];
maskA = -1;
displaceA = 0;
ofs += 2;
break;
case 0xaf: // xor a
regA = 0;
maskA = -1;
displaceA = 0;
++ofs;
break;
case 0x32: // ld (imm), a
if (bankSize - ofs < 2)
return;
{
int addr = rom[ofs + 1] | (rom[ofs + 2] << 8);
for (int i = 0; i < bankCount; ++i)
{
if (addr == bankReg[i])
{
if (mapper == MAPPER_KONAMI8KB_SCC &&
i == 2 && regA == 63)
break; // SCC enable
int fileOfs = page_ * bankSize + ofs;
if (fileOffsets.count({fileOfs, jpAddr}))
return;
Entry e;
e.ofs_ = ofs;
e.bank_ = i;
e.page_ = regA;
e.pageOfs_ = displaceA;
e.pageOfsCount_ = maskToCount(maskA);
entries_.push_back(e);
e.dump(page_, bankSize);
fileOffsets.insert({fileOfs, jpAddr});
break;
}
}
}
ofs += 3;
break;
case 0x18: // jr d
if (bankSize - ofs < 1)
return;
{
int8_t d = rom[ofs + 1];
jpAddr = ofs;
ofs = ofs + 2 + d;
if (ofs < 0 || ofs >= bankSize)
return;
++jpCount;
}
break;
case 0xc3: // jp d
case 0xcd: // call d
if (bankSize - ofs < 2)
return;
{
jpAddr = ofs;
ofs = (rom[ofs + 1] + (rom[ofs + 2] << 8)) - 0x4000; // ん？w
if (ofs < 0 || ofs >= bankSize)
return;
++jpCount;
}
break;
case 0x77: // ld (hl),a
case 0x23: // inc hl
case 0x2c: // inc l
case 0xfb: // ei
case 0xf3: // di
case 0xe5: // push hl
ofs += 1;
break;
case 0x21: // ld hl, #imm
ofs += 3;
break;
default:
return;
// ++ofs;
};
}
}
void makePagePairSimple(std::set<PagePair> &pagePairs,
const BankInfo bankInfos_[4],
int nPages)
{
auto complete = [](PagePair pp[2], int b0, int b1, int b2, int b3) {
if (pp[0].isValid())
{
if (pp[0].pages_[0] < 0)
pp[0].pages_[0] = b0;
if (pp[0].pages_[1] < 0)
pp[0].pages_[1] = b1;
}
if (pp[1].isValid())
{
if (pp[1].pages_[0] < 0)
pp[1].pages_[0] = b2;
if (pp[1].pages_[1] < 0)
pp[1].pages_[1] = b3;
}
};
if (entries_.empty())
return;
auto &be = entries_.front();
// 先頭と後続はおなじ特性と仮定
if (be.page_ >= 0)
{
PagePair pp[2];
for (auto &e : entries_)
{
if (e.page_ >= 0)
pp[e.bank_ >> 1].pages_[e.bank_ & 1] = e.page_;
else
printf("unexpected pattern (page>0)\n");
}
complete(pp, 0, 1, 2, 3);
for (auto &p : pp)
if (p.isValid())
pagePairs.insert(p);
}
else if (be.pageOfsCount_ > 0)
{
for (int i = 0; i < be.pageOfsCount_; ++i)
{
PagePair pp[2];
for (auto &e : entries_)
{
pp[e.bank_ >> 1].pages_[e.bank_ & 1] = e.pageOfs_ + i;
}
complete(pp, 0, 1, 2, 3);
for (auto &p : pp)
if (p.isValid())
pagePairs.insert(p);
}
}
else
{
for (int i = 0; i < nPages; ++i)
{
PagePair pp[2];
for (auto &e : entries_)
{
int p = e.pageOfs_ + i;
if (bankInfos_[e.bank_].perhaps_.count(p))
pp[e.bank_ >> 1].pages_[e.bank_ & 1] = p;
}
complete(pp, 0, 1, 2, 3);
for (auto &p : pp)
if (p.isValid())
pagePairs.insert(p);
}
}
}
};
std::vector<Record> records_;
BankInfo bankInfos_[4];
int bankSize_ = 0;
int nPages_ = 0;
std::set<PagePair> pagePairs_;
public:
void addPagePair(int a, int b)
{
PagePair tmppp;
tmppp.pages_[0] = a;
tmppp.pages_[1] = b;
pagePairs_.insert(tmppp);
}
static MapperType getMapperType(const char *str)
{
if (strcmp(str, "ascii8k") == 0)
return MAPPER_ASCII8KB;
else if (strcmp(str, "ascii16k") == 0)
return MAPPER_ASCII16KB;
else if (strcmp(str, "konami8k") == 0)
return MAPPER_KONAMI8KB;
else if (strcmp(str, "scc") == 0)
return MAPPER_KONAMI8KB_SCC;
else
{
printf("invalid mapper type '%s'\n", str);
exit(-1);
}
return MAPPER_ASCII8KB;
}
void analyze(const std::vector<uint8_t> &rom)
{
std::set<std::pair<int, int>> fileOffsets; // { addr, jpOrigin }
auto mapper = getMapperType(mapper_);
printf("mapper type = %d\n", mapper);
bankSize_ = getBankSize(mapper);
nPages_ = ((int)rom.size() + bankSize_ - 1) / bankSize_;
for (int ofs = 0; ofs < (int)rom.size(); ++ofs)
{
if ((ofs & 65535) == 0)
printf("analyzing addr %08x...\n", ofs);
Record r;
r.check(mapper, ofs, rom.data(), fileOffsets);
if (!r.entries_.empty())
{
records_.push_back(r);
printf("---\n");
}
}
printf("%zd records.\n", records_.size());
std::set<int> usedPage;
bankInfos_[0].certainly_.insert(0);
usedPage.insert(0);
for (auto &r : records_)
{
for (auto &e : r.entries_)
{
if (e.page_ >= 0)
{
usedPage.insert(e.page_);
bankInfos_[e.bank_].certainly_.insert(e.page_);
}
else if (e.pageOfsCount_ >= 0)
{
for (int i = 0; i < e.pageOfsCount_; ++i)
{
int p = i + e.pageOfs_;
usedPage.insert(p);
bankInfos_[e.bank_].certainly_.insert(p);
}
}
}
}
for (auto &r : records_)
{
for (auto &e : r.entries_)
{
if (e.page_ < 0 && e.pageOfsCount_ < 0)
{
for (int i = e.pageOfs_; i < nPages_; ++i)
{
if (usedPage.count(i) == 0)
{
bankInfos_[e.bank_].perhaps_.insert(i);
}
}
}
}
}
//
for (int i = 0; i < 4; ++i)
{
printf("Bank %d:\n", i);
auto &bi = bankInfos_[i];
printf(" cert : ");
for (auto p : bi.certainly_)
printf("%d ", p);
printf("\n");
printf(" perh : ");
for (auto p : bi.perhaps_)
printf("%d ", p);
printf("\n");
}
}
void dumpPagePairs()
{
for (auto &pp : pagePairs_)
printf("(%d, %d)\n", pp.pages_[0], pp.pages_[1]);
printf("%zd pages.\n", pagePairs_.size());
}
// シンプルな戦略で作成
void makePagePairSimple()
{
addPagePair(0, 0);
for (auto &r : records_)
{
r.makePagePairSimple(pagePairs_, bankInfos_, nPages_);
}
dumpPagePairs();
}
void makeROM(std::vector<uint8_t> &bios,
std::vector<uint8_t> &rom)
{
// 0x37fe 1 pageset(bank2) ofs
// 0x37ff 1 pageset(bank2) count
// 0x3800 64 bank1 table
// 0x3900 128 bank2a table
// 0x3a00 128 bank2b table
// 0x3b00 128 pageset(bank2) table
// pagesetは bank2b bank2a の順
memset(&bios[0x3800], 0, 0x3c00 - 0x3800);
for (auto &str : addPages_)
{
int p0, p1;
sscanf(str.c_str(), "%02x%02x", &p0, &p1);
printf("add page pair (%d, %d)\n", p0, p1);
addPagePair(p0, p1);
}
int pageSet2Begin = INT_MAX;
int nPageSet2 = 0;
int i = 2;
std::vector<uint8_t> processedMask(256, 0);
for (auto &pp : pagePairs_)
{
if (pp.pages_[0] == 0)
bios[0x3800 + pp.pages_[1]] = i;
else
{
if (!(processedMask[pp.pages_[0]] & 1))
{
processedMask[pp.pages_[0]] |= 1;
bios[0x3900 + pp.pages_[0] * 2 + 0] = i;
bios[0x3900 + pp.pages_[0] * 2 + 1] = pp.pages_[1];
}
if (!(processedMask[pp.pages_[1]] & 2))
{
processedMask[pp.pages_[1]] |= 2;
bios[0x3a00 + pp.pages_[1] * 2 + 0] = i;
bios[0x3a00 + pp.pages_[1] * 2 + 1] = pp.pages_[0];
}
bios[0x3b00 + nPageSet2 * 2 + 0] = pp.pages_[1];
bios[0x3b00 + nPageSet2 * 2 + 1] = pp.pages_[0];
pageSet2Begin = std::min(i, pageSet2Begin);
++nPageSet2;
}
++i;
}
bios[0x37fe] = pageSet2Begin;
bios[0x37ff] = nPageSet2;
printf("Bank1 table:\n");
for (int i = 0; i < 64; ++i)
printf("%02x ", bios[0x3800 + i]);
printf("\n");
printf("Bank1a table:\n");
for (int i = 0; i < 64; ++i)
{
int a = bios[0x3900 + i * 2 + 0];
int b = bios[0x3900 + i * 2 + 1];
if (a == 0 && b == 0)
printf("x ");
else
printf("%02x:%02x ", a, b);
}
printf("\n");
printf("Bank1b table:\n");
for (int i = 0; i < 64; ++i)
{
int a = bios[0x3a00 + i * 2 + 0];
int b = bios[0x3a00 + i * 2 + 1];
if (a == 0 && b == 0)
printf("x ");
else
printf("%02x:%02x ", a, b);
}
printf("\n");
printf("Pageset2 ofs: %d, pageset2 count: %d\n",
pageSet2Begin, nPageSet2);
for (int i = 0; i < nPageSet2; ++i)
printf("%04x ",
bios[0x3b00 + i * 2 + 0] | (bios[0x3b00 + i * 2 + 1] << 8));
printf("\n");
////////////////
static constexpr int change_bank1 = 0x3c00;
static constexpr int change_bank2 = 0x3c0c;
static constexpr int change_bank3 = 0x3c34;
static constexpr int cur_bank_addr = 0xf65c;
printf("patch bank change\n");
for (auto &r : records_)
{
int n = (int)r.entries_.size();
for (int i = 0; i < n; ++i)
{
bool last = i == n - 1; // 連続したサブバンク切り替えでのページ探索を1回にしたい
auto &e = r.entries_[i];
auto ofs = r.page_ * bankSize_ + e.ofs_;
switch (e.bank_)
{
case 1:
rom[ofs + 0] = 0xcd;
rom[ofs + 1] = change_bank1 & 255;
rom[ofs + 2] = (change_bank1 >> 8) & 255;
break;
case 2:
if (last)
{
rom[ofs + 0] = 0xcd;
rom[ofs + 1] = change_bank2 & 255;
rom[ofs + 2] = (change_bank2 >> 8) & 255;
}
else
{
rom[ofs + 1] = (cur_bank_addr + 2) & 255;
rom[ofs + 2] = (cur_bank_addr >> 8) & 255;
}
break;
case 3:
if (last)
{
rom[ofs + 0] = 0xcd;
rom[ofs + 1] = change_bank3 & 255;
rom[ofs + 2] = (change_bank3 >> 8) & 255;
}
else
{
rom[ofs + 1] = (cur_bank_addr + 3) & 255;
rom[ofs + 2] = (cur_bank_addr >> 8) & 255;
}
break;
}
}
}
////////////////
printf("make new ROM\n");
std::vector<uint8_t> newRom(16384 * pagePairs_.size());
i = 0;
for (auto &pp : pagePairs_)
{
if (pp.pages_[0] >= 0)
memcpy(&newRom[i * 16384],
&rom[pp.pages_[0] * bankSize_],
bankSize_);
if (pp.pages_[0] >= 0)
memcpy(&newRom[i * 16384 + bankSize_],
&rom[pp.pages_[1] * bankSize_],
bankSize_);
++i;
}
swap(newRom, rom);
printf("new rom size = %zd\n", rom.size());
}
void makeROM_16KBMapper(std::vector<uint8_t> &rom)
{
// todo...
static constexpr int change_bank0 = 0x3c4a;
static constexpr int change_bank1 = 0x3c52;
printf("patch bank change\n");
for (auto &r : records_)
{
int n = (int)r.entries_.size();
for (int i = 0; i < n; ++i)
{
auto &e = r.entries_[i];
auto ofs = r.page_ * bankSize_ + e.ofs_;
switch (e.bank_)
{
case 0:
rom[ofs + 0] = 0xcd;
rom[ofs + 1] = change_bank0 & 255;
rom[ofs + 2] = (change_bank0 >> 8) & 255;
break;
case 1:
rom[ofs + 0] = 0xcd;
rom[ofs + 1] = change_bank1 & 255;
rom[ofs + 2] = (change_bank1 >> 8) & 255;
break;
default:
printf(" invalid bank %d.\n", e.bank_);
break;
}
}
}
}
};
int getKeyAddr(const std::string &str)
{
const char *keys[] =
{
"0",
"1",
"2",
"3",
"4",