WUMSLoader/wumsloader/src/utils/dynamic.c

#include <coreinit/debug.h>
#include <coreinit/dynload.h>

#define IMPORT(name) void *addr_##name
#define IMPORT_BEGIN(lib)
#define IMPORT_END()

#include "imports.h"

#undef IMPORT
#undef IMPORT_BEGIN
#undef IMPORT_END

#define IMPORT(name)                                                                                         \
    do {                                                                                                     \
        if (OSDynLoad_FindExport(handle, 0, #name, &addr_##name) < 0) OSFatal("Function " #name " is NULL"); \
    } while (0)
#define IMPORT_BEGIN(lib)                                                                                        \
    do {                                                                                                         \
        if (OSDynLoad_IsModuleLoaded(#lib ".rpl", &handle) != OS_DYNLOAD_OK) OSFatal(#lib ".rpl is not loaded"); \
    } while (0)
#define IMPORT_END()

#define EXPORT_VAR(type, var) type var __attribute__((section(".data")));

EXPORT_VAR(uint32_t *, MEMAllocFromDefaultHeap);
EXPORT_VAR(uint32_t *, MEMAllocFromDefaultHeapEx);
EXPORT_VAR(uint32_t *, MEMFreeToDefaultHeap);

void InitFunctionPointers(void) {
    OSDynLoad_Module handle;
    addr_OSDynLoad_Acquire        = (void *) 0x0102A3B4; // 0x0200dfb4 - 0xFE3C00
    addr_OSDynLoad_FindExport     = (void *) 0x0102B828; // 0200f428 - 0xFE3C00
    addr_OSDynLoad_IsModuleLoaded = (void *) 0x0102A59C; // 0200e19c - 0xFE3C00

    OSDynLoad_Acquire("coreinit.rpl", &handle);

    uint32_t **value = 0;
    OSDynLoad_FindExport(handle, 1, "MEMAllocFromDefaultHeap", (void **) &value);
    MEMAllocFromDefaultHeap = *value;
    OSDynLoad_FindExport(handle, 1, "MEMAllocFromDefaultHeapEx", (void **) &value);
    MEMAllocFromDefaultHeapEx = *value;
    OSDynLoad_FindExport(handle, 1, "MEMFreeToDefaultHeap", (void **) &value);
    MEMFreeToDefaultHeap = *value;
#include "imports.h"
    // override failed __rplwrap_exit find export
    OSDynLoad_FindExport(handle, 0, "exit", (void **) &addr___rplwrap_exit);
}