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Disassemble the rom header and entrypoint function (#87)
The actual boot code (ipl3) is still only incbin'd. If someone else wants to disassemble it properly, go ahead. I might do it eventually, but for now it doesn't seem required for shiftability or anything interesting.
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26b8e77f99
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6 changed files with 76 additions and 12 deletions
35
asm/entry.s
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35
asm/entry.s
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@ -0,0 +1,35 @@
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.include "macro.inc"
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# assembler directives
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.set noat # allow manual use of $at
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.set noreorder # don't insert nops after branches
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.set gp=64 # allow use of 64-bit general purposee registers
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.section .text
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glabel entrypoint # 0x80000400
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lui $t0, %hi(_bootSegmentBssStart) # $t0, 0x8001
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addiu $t0, %lo(_bootSegmentBssStart) # addiu $t0, $t0, 0x2370
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li $t1, %lo(_bootSegmentBssSize) # li $t1, 0x4A30
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.L8000040C:
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addi $t1, $t1, -8
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sw $zero, ($t0)
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sw $zero, 4($t0)
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bnez $t1, .L8000040C
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addi $t0, $t0, 8
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lui $t2, %hi(bootproc) # $t2, 0x8000
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lui $sp, %hi(gMainThread) # $sp, 0x8001
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addiu $t2, %lo(bootproc) # addiu $t2, $t2, 0x0498
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jr $t2
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addiu $sp, %lo(gMainThread) # addiu $sp, $sp, 0x2D60
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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10
asm/ipl3.s
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10
asm/ipl3.s
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@ -0,0 +1,10 @@
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.include "macro.inc"
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# assembler directives
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.set noat # allow manual use of $at
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.set noreorder # don't insert nops after branches
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.set gp=64 # allow use of 64-bit general purposee registers
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.section .text
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.incbin "baserom.z64", 0x40, 0xFC0
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18
asm/rom_header.s
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18
asm/rom_header.s
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@ -0,0 +1,18 @@
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/*
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* The Legend of Zelda: Ocarina of Time ROM header
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*/
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.byte 0x80, 0x37, 0x12, 0x40 /* PI BSD Domain 1 register */
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.word 0x0000000F /* Clockrate setting */
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.word 0x80000400 /* Entrypoint function (`entrypoint`) */
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.word 0x0000144C /* Revision */
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.word 0x917D18F6 /* Checksum 1 */
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.word 0x69BC5453 /* Checksum 2 */
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.word 0x00000000 /* Unknown */
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.word 0x00000000 /* Unknown */
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.ascii "THE LEGEND OF ZELDA " /* Internal ROM name */
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.word 0x00000000 /* Unknown */
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.word 0x0000004E /* Cartridge */
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.ascii "ZL" /* Cartridge ID */
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.ascii "P" /* Region */
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.byte 0x0F /* Version */
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@ -51,6 +51,7 @@ DECLARE_ROM_SEGMENT(map_grand_static)
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DECLARE_ROM_SEGMENT(map_i_static)
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DECLARE_ROM_SEGMENT(map_48x85_static)
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DECLARE_SEGMENT(code)
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DECLARE_ROM_SEGMENT(code)
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DECLARE_BSS_SEGMENT(code)
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12
spec
12
spec
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@ -4,12 +4,14 @@
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beginseg
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name "makerom"
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include "build/baserom/makerom.o"
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address 0x80000000
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include "build/asm/rom_header.o"
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include "build/asm/ipl3.o"
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include "build/asm/entry.o"
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endseg
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beginseg
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name "boot"
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address 0x80000460
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include "build/src/boot/boot_main.o"
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include "build/src/boot/idle.o"
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include "build/src/boot/viconfig.o"
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@ -107,13 +109,11 @@ beginseg
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include "build/src/libultra_boot_O1/__osGetHWIntrRoutine.o"
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include "build/asm/__osSetWatchLo.o"
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include "build/data/rsp_boot.text.o"
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address 0x80000460
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endseg
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beginseg
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name "dmadata"
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include "build/asm/dmadata.o"
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address 0x80016DA0
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endseg
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beginseg
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@ -269,6 +269,7 @@ endseg
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beginseg
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name "code"
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address 0x8001CE60
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include "build/src/code/z_en_a_keep.o"
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include "build/data/z_en_a_keep.data.o"
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include "build/src/code/z_en_item00.o"
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@ -574,7 +575,6 @@ beginseg
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include "build/src/code/z_construct.o"
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include "build/data/rsp.text.o"
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include "build/data/rsp.rodata.o"
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address 0x8001CE60
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endseg
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beginseg
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@ -586,9 +586,9 @@ endseg
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beginseg
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name "ovl_title"
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address 0x80800000
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include "build/src/overlays/gamestates/ovl_title/z_title.o"
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include "build/src/overlays/gamestates/ovl_title/z_title_reloc.o"
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address 0x80800000
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endseg
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beginseg
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@ -2,7 +2,7 @@
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#include <global.h>
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#include <vt.h>
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OSThread sMainThread;
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OSThread gMainThread;
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u8 sMainStack[0x900];
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StackEntry sMainStackInfo;
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OSMesg sPiMgrCmdBuff[50];
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@ -24,7 +24,7 @@ void Main_ThreadEntry(void* arg0) {
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DmaMgr_Start();
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osSyncPrintf("codeセグメントロード中...");
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var1 = osGetTime();
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DmaMgr_SendRequest1((u32)_dmadataSegmentEnd, (u32)_codeSegmentRomStart, _codeSegmentRomEnd - _codeSegmentRomStart,
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DmaMgr_SendRequest1(_codeSegmentStart, (u32)_codeSegmentRomStart, _codeSegmentRomEnd - _codeSegmentRomStart,
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"../idle.c", 238);
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var1 -= osGetTime();
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osSyncPrintf("\rcodeセグメントロード中...完了\n");
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@ -78,11 +78,11 @@ void Idle_ThreadEntry(void* a0) {
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osViSetMode(&gViConfigMode);
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ViConfig_UpdateVi(1);
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osViBlack(1);
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osViSwapBuffer(0x803da80);
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osCreatePiManager(0x96, &gPiMgrCmdQ, sPiMgrCmdBuff, 0x32);
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osViSwapBuffer(0x803DA80); //! @bug Invalid vram address (probably intended to be 0x803DA800)
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osCreatePiManager(150, &gPiMgrCmdQ, sPiMgrCmdBuff, 50);
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StackCheck_Init(&sMainStackInfo, sMainStack, sMainStack + sizeof(sMainStack), 0, 0x400, "main");
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osCreateThread(&sMainThread, 3, Main_ThreadEntry, a0, sMainStack + sizeof(sMainStack), 10);
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osStartThread(&sMainThread);
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osCreateThread(&gMainThread, 3, Main_ThreadEntry, a0, sMainStack + sizeof(sMainStack), 10);
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osStartThread(&gMainThread);
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osSetThreadPri(NULL, 0);
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while (1) {
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