/*
* Includes
*/
#include "ndstool.h"
#include "crc.h"
#include "passme_sram.h"
/*
*
*/
#define DS_RAM 0x02000000
#define RAM_SIZE (4*1024*1024)
unsigned char *pc_ram;
/*
* Find
*/
template <typename T> unsigned long Find(FILE *f, const char *fmt, unsigned long begin, unsigned long end, T data, T mask, int thumb, int armnr)
{
for (unsigned long i=begin; i<end; i+=sizeof(T))
{
T w = *(T *)(pc_ram + i - DS_RAM);
w &= mask;
if (w == data)
{
if (armnr == 7)
header.arm7_entry_address = i + thumb; // ARM7 entry
else
header.arm9_entry_address = i + thumb; // ARM9 entry
if (f) fprintf(f, fmt, i + thumb);
printf(fmt, i + thumb);
return i;
}
}
return 0;
}
/*
* PassMe
*/
int PassMe(char *ndsfilename, char *vhdfilename, char *sramfilename)
{
fNDS = fopen(ndsfilename, "rb");
if (!fNDS) { fprintf(stderr, "Cannot open file '%s'.\n", ndsfilename); exit(1); }
FILE *fVHD = fopen(vhdfilename, "wt");
if (vhdfilename && !fVHD) { fprintf(stderr, "Cannot open file '%s'.\n", vhdfilename); exit(1); }
fread(&header, 512, 1, fNDS);
if (fVHD)
{
fprintf(fVHD, "-- PassMe generated CPLD code\n");
fprintf(fVHD, "-- Game code: \t"); for (unsigned int i=0; i<sizeof(header.gamecode); i++) fprintf(fVHD, "%c", header.gamecode[i]); fprintf(fVHD, "\n");
fprintf(fVHD, "-- ROM version: \t"); fprintf(fVHD, "%d\n", header.romversion);
fprintf(fVHD, "-- Game title: \t"); for (unsigned int i=0; i<sizeof(header.title); i++) if (header.title[i]) fprintf(fVHD, "%c", header.title[i]);
fprintf(fVHD, "\n\n");
}
pc_ram = new unsigned char[RAM_SIZE];
// load ARM7 binary
fseek(fNDS, header.arm7_rom_offset, SEEK_SET);
fread(pc_ram + header.arm7_ram_address - DS_RAM, 1, header.arm7_size, fNDS);
// load ARM9 binary
fseek(fNDS, header.arm9_rom_offset, SEEK_SET);
fread(pc_ram + header.arm9_ram_address - DS_RAM, 1, header.arm9_size, fNDS);
header.arm7_entry_address = 0x55555555;
header.arm9_entry_address = 0x55555555;
unsigned char old_header[512];
memcpy(old_header, &header, 512);
bool bError = false;
unsigned int begin9 = 0x02000000, end9 = 0x02280000;
//unsigned int begin9 = header.arm9_ram_address, end9 = header.arm9_ram_address + header.arm9_size;
if (!Find<unsigned long>(fVHD, "-- BX LR @ 0x%08X\n", begin9, end9, 0xE120001E, 0xFFF000FF, 0, 9)) // BX LR
// if (!Find<unsigned short>(fVHD, "-- BX LR @ 0x%08X\n", begin9, end9, 0x4770, 0xFFFF, 1, 9)) // BX LR
{ printf("BX LR instruction not found!\n"); bError = true; }
unsigned int begin7 = 0x02000000, end7 = 0x023FE000;
//unsigned int begin7 = header.arm7_ram_address, end7 = header.arm7_ram_address + header.arm7_size;
// if (!Find<unsigned long>(fVHD, "-- SWI 0xAF @ 0x%08X\n", begin7, end7, 0xEFAF0000, 0xFFFF0000, 0, 7)) // SWI
// if (!Find<unsigned long>(fVHD, "-- SWI 0xFF @ 0x%08X\n", begin7, end7, 0xEFFF0000, 0xFFFF0000, 0, 7)) // SWI
// if (!Find<unsigned long>(fVHD, "-- SWI 0xA4 @ 0x%08X\n", begin7, end7, 0xEFA40000, 0xFFFF0000, 0, 7)) // SWI
// if (!Find<unsigned long>(fVHD, "-- SWI 0xEA @ 0x%08X\n", begin7, end7, 0xEFEA0000, 0xFFFF0000, 0, 7)) // SWI
if (!Find<unsigned short>(fVHD, "-- SWI 0xAF @ 0x%08X\n", begin7, end7, 0xDFAF, 0xFFFF, 1, 7)) // SWI
if (!Find<unsigned short>(fVHD, "-- SWI 0xFF @ 0x%08X\n", begin7, end7, 0xDFFF, 0xFFFF, 1, 7)) // SWI
if (!Find<unsigned short>(fVHD, "-- SWI 0xA4 @ 0x%08X\n", begin7, end7, 0xDFA4, 0xFFFF, 1, 7)) // SWI
if (!Find<unsigned short>(fVHD, "-- SWI 0xEA @ 0x%08X\n", begin7, end7, 0xDFEA, 0xFFFF, 1, 7)) // SWI
{ printf("SWI instruction not found!\n"); bError = true; }
//Find<unsigned long>("%08X\n", 0x037F8000, 0x0380F000, 0xEFEA0000, 0xFFFF0000, 0); // SWI
//...
//Find<unsigned short>("%08X\n", 0x037F8000, 0x0380F000, 0xDFA4, 0xFFFF, 1); // SWI
//...
if (bError)
{
printf("Cannot patch.\n");
return -1;
}
else
{
/*
* VHD
*/
header.reserved2 |= 0x04; // set autostart bit
bool forcepatch[512];
memset(forcepatch, 0, sizeof(forcepatch));
// ldr pc, 0x027FFE24
((unsigned char *)&header)[0x4] = 0x18;
((unsigned char *)&header)[0x5] = 0xF0;
((unsigned char *)&header)[0x6] = 0x9F;
((unsigned char *)&header)[0x7] = 0xE5;
header.header_crc = CalcCrc16((unsigned char *)&header, 0x15E);
if (fVHD) fputs(
#include "passme_vhd1.h"
, fVHD
);
for (int i=0; i<512; i++)
{
if (((unsigned char *)&header)[i] != old_header[i])
{
printf("Patch:\t0x%03X\t0x%02X\n", i, ((unsigned char *)&header)[i]);
if (fVHD) fprintf(fVHD, "\t\t\twhen 16#%03X# => patched_data <= X\"%02X\";\n", i, ((unsigned char *)&header)[i]);
}
}
if (fVHD) fputs(
#include "passme_vhd2.h"
, fVHD
);
if (fVHD) fclose(fVHD);
/*
* SRAM
*/
printf("ARM9 patched entry address: \t0x%08X\n", (unsigned int)header.arm9_entry_address);
FILE *fSRAM = fopen(sramfilename, "wb");
if (sramfilename && !fSRAM) { fprintf(stderr, "Cannot open file '%s'.\n", sramfilename); exit(1); }
if (fSRAM)
{
for (int i=0; i<passme_sram_size; i++)
{
unsigned char c = passme_sram[i];
// patch with address of ARM9 loop so it can be redirected by the code in SRAM.
if ((i &~ 1) == 0x764) c = header.arm9_entry_address >> 0 & 0xFF;
if ((i &~ 1) == 0x796) c = header.arm9_entry_address >> 8 & 0xFF;
if ((i &~ 1) == 0x7C8) c = header.arm9_entry_address >> 16 & 0xFF;
if ((i &~ 1) == 0x7FA) c = header.arm9_entry_address >> 24 & 0xFF;
fputc(c, fSRAM);
}
fclose(fSRAM);
}
}
fclose(fNDS);
return 0;
}
