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#include "global.h"
s32 Overlay_Load(uintptr_t vromStart, uintptr_t vromEnd, void* vramStart, void* vramEnd, void* allocatedRamAddr) {
s32 pad[3];
uintptr_t end;
OverlayRelocationSection* ovlRelocs;
u32 relocSectionOffset;
size_t size;
size = vromEnd - vromStart;
end = (uintptr_t)allocatedRamAddr + size;
if (gOverlayLogSeverity >= 3) {
// "Start loading dynamic link function"
osSyncPrintf("\nダイナミックリンクファンクションのロードを開始します\n");
}
if (gOverlayLogSeverity >= 3) {
// "DMA transfer of TEXT, DATA, RODATA + rel (%08x-%08x)"
osSyncPrintf("TEXT,DATA,RODATA+relをＤＭＡ転送します(%08x-%08x)\n", allocatedRamAddr, end);
}
// DMA the overlay, wait until transfer completes
DmaMgr_RequestSync(allocatedRamAddr, vromStart, size);
// The overlay file is expected to contain a 32-bit offset from the end of the file to the start of the
// relocation section.
relocSectionOffset = ((s32*)end)[-1];
ovlRelocs = (OverlayRelocationSection*)(end - relocSectionOffset);
if (gOverlayLogSeverity >= 3) {
osSyncPrintf("TEXT(%08x), DATA(%08x), RODATA(%08x), BSS(%08x)\n", ovlRelocs->textSize, ovlRelocs->dataSize,
ovlRelocs->rodataSize, ovlRelocs->bssSize);
}
if (gOverlayLogSeverity >= 3) {
osSyncPrintf("リロケーションします\n"); // "Relocate"
}
// Relocate pointers in overlay code and data
Overlay_Relocate(allocatedRamAddr, ovlRelocs, vramStart);
// Clear bss if present, bss is located immediately following the relocations
if (ovlRelocs->bssSize != 0) {
if (gOverlayLogSeverity >= 3) {
// "Clear BSS area (% 08x-% 08x)"
osSyncPrintf("BSS領域をクリアします(%08x-%08x)\n", end, end + ovlRelocs->bssSize);
}
bzero((void*)end, (s32)ovlRelocs->bssSize);
}
size = (uintptr_t)&ovlRelocs->relocations[ovlRelocs->nRelocations] - (uintptr_t)ovlRelocs;
if (gOverlayLogSeverity >= 3) {
// "Clear REL area (%08x-%08x)"
osSyncPrintf("REL領域をクリアします(%08x-%08x)\n", ovlRelocs, (uintptr_t)ovlRelocs + size);
}
// Clear relocations, this space remains allocated and goes unused
bzero(ovlRelocs, size);
// Manually flush caches
size = (uintptr_t)vramEnd - (uintptr_t)vramStart;
osWritebackDCache(allocatedRamAddr, size);
osInvalICache(allocatedRamAddr, size);
if (gOverlayLogSeverity >= 3) {
// "Finish loading dynamic link function"
osSyncPrintf("ダイナミックリンクファンクションのロードを終了します\n\n");
}
return size;
}
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