[ntsc-1.2] LoadFragment2 OK (#2118)

* [ntsc-1.2] LoadFragment2 OK * Add insight about bssSize
2026-06-29 11:30:56 -04:00 · 2024-09-03 17:19:13 -06:00
parent 2152d1df2d
commit 3e200769f1
8 changed files with 231 additions and 15 deletions
@@ -0,0 +1,74 @@
+#include "global.h"
+
+size_t Overlay_Load(uintptr_t vromStart, uintptr_t vromEnd, void* vramStart, void* vramEnd, void* allocatedRamAddr) {
+    s32 pad[3];
+    uintptr_t end;
+    OverlayRelocationSection* ovlRelocs;
+    u32 relocSectionOffset = 0;
+    s32 size = vromEnd - vromStart;
+
+    if (gOverlayLogSeverity >= 3) {
+        PRINTF(
+            T("\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", "\nStart loading dynamic link function\n"));
+    }
+
+    size = vromEnd - vromStart;
+    end = (uintptr_t)allocatedRamAddr + size;
+
+    if (gOverlayLogSeverity >= 3) {
+        PRINTF(T("TEXT,DATA,RODATA+relをＤＭＡ転送します(%08x-%08x)\n",
+                 "DMA transfer of TEXT, DATA, RODATA + rel (%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) {
+        PRINTF("TEXT(%08x), DATA(%08x), RODATA(%08x), BSS(%08x)\n", ovlRelocs->textSize, ovlRelocs->dataSize,
+               ovlRelocs->rodataSize, ovlRelocs->bssSize);
+    }
+
+    if (gOverlayLogSeverity >= 3) {
+        PRINTF(T("リロケーションします\n", "Relocate\n"));
+    }
+
+    // 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) {
+            PRINTF(T("BSS領域をクリアします(%08x-%08x)\n", "Clear BSS area (%08x-%08x)\n"), end,
+                   end + ovlRelocs->bssSize);
+        }
+        bzero((void*)end, ovlRelocs->bssSize);
+    }
+
+    size = (uintptr_t)(ovlRelocs->relocations + ovlRelocs->nRelocations) - (uintptr_t)ovlRelocs;
+
+    if (gOverlayLogSeverity >= 3) {
+        PRINTF(T("REL領域をクリアします(%08x-%08x)\n", "Clear REL area (%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) {
+        PRINTF(
+            T("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", "Finish loading dynamic link function\n\n"));
+    }
+
+    return size;
+}