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Initial work on homebrew return to loader

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This commit is contained in:
Gericom
2026-01-04 15:39:47 +01:00
parent f1e5f0cddc
commit 5c8e98a03f
13 changed files with 387 additions and 5 deletions
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39
arm9/source/main.cpp
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@@ -27,6 +27,8 @@
#include "errorDisplay/ErrorDisplay.h"
#include "LoaderInfo.h"
#include "jumpToArm9EntryPoint.h"
#include "patches/homebrew/BootstubPatchCode.h"
#include "HomebrewBootstub.h"
#define HANDSHAKE_PART0 0xA
#define HANDSHAKE_PART1 0xB
@@ -231,6 +233,37 @@ static void handleBootCommand()
bootArm9();
}
static void handleApplyHomebrewPatches(u32 dldiRequiredSpace)
{
// Insert bootstub
PatchHeap patchHeap;
PatchCodeCollection patchCodeCollection;
void* patchSpace = (void*)&HOMEBREW_BOOTSTUB[1];
auto romHeader = (const nds_header_ntr_t*)TWL_SHARED_MEMORY->ntrSharedMem.romHeader;
if (!romHeader->IsTwlRom())
{
patchSpace = (u8*)patchSpace - 0x2F00000 + 0x2300000;
}
patchHeap.AddFreeSpace(patchSpace, 32 * 1024 - sizeof(homebrew_bootstub_t));
void* dldi = patchHeap.Alloc(dldiRequiredSpace);
char* launcherPath = (char*)patchHeap.Alloc(256);
auto bootstubPatchCode = patchCodeCollection.AddUniquePatchCode<BootstubPatchCode>(
patchHeap, dldi, launcherPath, &sLoaderInfo,
sLoaderPlatform->CreateSdReadPatchCode(patchCodeCollection, patchHeap));
HOMEBREW_BOOTSTUB->bootSig = HOMEBREW_BOOTSTUB_BOOTSIG;
HOMEBREW_BOOTSTUB->arm9Reboot = (void*)bootstubPatchCode->GetArm9RebootFunction();
HOMEBREW_BOOTSTUB->arm7Reboot = (void*)bootstubPatchCode->GetArm7RebootFunction();
HOMEBREW_BOOTSTUB->bootSize = 32 * 1024 - sizeof(homebrew_bootstub_t);
patchCodeCollection.CopyAllToTarget();
ipc_sendWordDirect((u32)dldi);
ipc_sendWordDirect((u32)launcherPath);
}
static void handleArm7Command(u32 command)
{
switch (command)
@@ -295,6 +328,12 @@ static void handleArm7Command(u32 command)
handleBootCommand();
break;
}
case IPC_COMMAND_ARM9_APPLY_HOMEBREW_PATCHES:
{
u32 dldiRequiredSpace = receiveFromArm7();
handleApplyHomebrewPatches(dldiRequiredSpace);
break;
}
}
}