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Gericom
2025-11-22 11:08:28 +01:00
commit 9cf3ffbfcf
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59
arm9/source/ModuleParamsLocator.cpp Normal file
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#include "common.h"
#include "ModuleParamsLocator.h"
module_params_ntr_t* ModuleParamsLocator::FindModuleParams(const nds_header_ntr_t* romHeader)
{
//todo: static footer
module_params_ntr_t* moduleParams = nullptr;
if (romHeader->arm9ModuleParamsAddress != 0)
{
moduleParams = (module_params_ntr_t*)(romHeader->arm9LoadAddress + romHeader->arm9ModuleParamsAddress);
if (moduleParams->magicBigEndian != MODULE_PARAMS_NTR_MAGIC_BE ||
moduleParams->magicLittleEndian != MODULE_PARAMS_NTR_MAGIC_LE)
{
// try again by subtracting arm9 rom address
moduleParams = (module_params_ntr_t*)((u8*)moduleParams - romHeader->arm9RomOffset);
if (moduleParams->magicBigEndian != MODULE_PARAMS_NTR_MAGIC_BE ||
moduleParams->magicLittleEndian != MODULE_PARAMS_NTR_MAGIC_LE)
{
LOG_DEBUG("Module params not found at header specified offset 0x%x\n", romHeader->arm9ModuleParamsAddress);
moduleParams = nullptr;
}
}
}
else
{
LOG_DEBUG("Header specifies no module params address\n");
}
if (!moduleParams)
{
// try searching for the module params as not all roms have the address in the header
// it should be within the first 0x1000 bytes of the arm9
for (u32 i = 0; i < 0x1000; i += 4)
{
u32* ptr = (u32*)(romHeader->arm9LoadAddress + i);
if (ptr[0] == MODULE_PARAMS_NTR_MAGIC_BE && ptr[1] == MODULE_PARAMS_NTR_MAGIC_LE)
{
moduleParams = (module_params_ntr_t*)((u8*)ptr + 8 - sizeof(module_params_ntr_t));
break;
}
}
}
if (!moduleParams)
{
// as a last resort, scan the entire arm9 binary
for (u32 i = 0; i < romHeader->arm9Size; i += 4)
{
u32* ptr = (u32*)(romHeader->arm9LoadAddress + i);
if (ptr[0] == MODULE_PARAMS_NTR_MAGIC_BE && ptr[1] == MODULE_PARAMS_NTR_MAGIC_LE)
{
moduleParams = (module_params_ntr_t*)((u8*)ptr + 8 - sizeof(module_params_ntr_t));
break;
}
}
}
return moduleParams;
}