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Further documentation for overlay relocation (#1498)

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* Further documentation for overlay relocation

* Suggested changes

* Format

* REL_ -> RELOC_
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Tharo 2023-02-27 08:14:02 +00:00 • committed by GitHub
parent 35887e25ee
commit 12f67e108a
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5 changed files with 128 additions and 64 deletions
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50
src/code/load.c
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@ -1,14 +1,14 @@
#include "global.h"
s32 Overlay_Load(uintptr_t vRomStart, uintptr_t vRomEnd, void* vRamStart, void* vRamEnd, void* allocatedVRamAddr) {
s32 Overlay_Load(uintptr_t vromStart, uintptr_t vromEnd, void* vramStart, void* vramEnd, void* allocatedRamAddr) {
s32 pad[3];
uintptr_t end;
OverlayRelocationSection* ovl;
u32 ovlOffset;
OverlayRelocationSection* ovlRelocs;
u32 relocSectionOffset;
size_t size;
size = vRomEnd - vRomStart;
end = (uintptr_t)allocatedVRamAddr + size;
size = vromEnd - vromStart;
end = (uintptr_t)allocatedRamAddr + size;
if (gOverlayLogSeverity >= 3) {
// "Start loading dynamic link function"
@ -17,44 +17,52 @@ s32 Overlay_Load(uintptr_t vRomStart, uintptr_t vRomEnd, void* vRamStart, void*
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", allocatedVRamAddr, end);
osSyncPrintf("TEXT,DATA,RODATA+relをＤＭＡ転送します(%08x-%08x)\n", allocatedRamAddr, end);
}
DmaMgr_RequestSync(allocatedVRamAddr, vRomStart, size);
// DMA the overlay, wait until transfer completes
DmaMgr_RequestSync(allocatedRamAddr, vromStart, size);
ovlOffset = ((s32*)end)[-1];
// 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);
ovl = (OverlayRelocationSection*)(end - ovlOffset);
if (gOverlayLogSeverity >= 3) {
osSyncPrintf("TEXT(%08x), DATA(%08x), RODATA(%08x), BSS(%08x)\n", ovl->textSize, ovl->dataSize, ovl->rodataSize,
ovl->bssSize);
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"
}
Overlay_Relocate(allocatedVRamAddr, ovl, vRamStart);
// Relocate pointers in overlay code and data
Overlay_Relocate(allocatedRamAddr, ovlRelocs, vramStart);
if (ovl->bssSize != 0) {
// 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 + ovl->bssSize);
osSyncPrintf("BSS領域をクリアします(%08x-%08x)\n", end, end + ovlRelocs->bssSize);
}
bzero((void*)end, ovl->bssSize);
bzero((void*)end, ovlRelocs->bssSize);
}
size = (uintptr_t)&ovl->relocations[ovl->nRelocations] - (uintptr_t)ovl;
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", ovl, (uintptr_t)ovl + size);
osSyncPrintf("REL領域をクリアします(%08x-%08x)\n", ovlRelocs, (uintptr_t)ovlRelocs + size);
}
bzero(ovl, size);
// Clear relocations, this space remains allocated and goes unused
bzero(ovlRelocs, size);
size = (uintptr_t)vRamEnd - (uintptr_t)vRamStart;
osWritebackDCache(allocatedVRamAddr, size);
osInvalICache(allocatedVRamAddr, 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"