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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.
This commit is contained in:
Roman971 2020-04-22 19:44:46 +02:00 committed by GitHub
parent 26b8e77f99
commit 0a59863457
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 76 additions and 12 deletions

35
asm/entry.s Normal file
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@ -0,0 +1,35 @@
.include "macro.inc"
# assembler directives
.set noat # allow manual use of $at
.set noreorder # don't insert nops after branches
.set gp=64 # allow use of 64-bit general purposee registers
.section .text
glabel entrypoint # 0x80000400
lui $t0, %hi(_bootSegmentBssStart) # $t0, 0x8001
addiu $t0, %lo(_bootSegmentBssStart) # addiu $t0, $t0, 0x2370
li $t1, %lo(_bootSegmentBssSize) # li $t1, 0x4A30
.L8000040C:
addi $t1, $t1, -8
sw $zero, ($t0)
sw $zero, 4($t0)
bnez $t1, .L8000040C
addi $t0, $t0, 8
lui $t2, %hi(bootproc) # $t2, 0x8000
lui $sp, %hi(gMainThread) # $sp, 0x8001
addiu $t2, %lo(bootproc) # addiu $t2, $t2, 0x0498
jr $t2
addiu $sp, %lo(gMainThread) # addiu $sp, $sp, 0x2D60
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop

10
asm/ipl3.s Normal file
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@ -0,0 +1,10 @@
.include "macro.inc"
# assembler directives
.set noat # allow manual use of $at
.set noreorder # don't insert nops after branches
.set gp=64 # allow use of 64-bit general purposee registers
.section .text
.incbin "baserom.z64", 0x40, 0xFC0

18
asm/rom_header.s Normal file
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@ -0,0 +1,18 @@
/*
* The Legend of Zelda: Ocarina of Time ROM header
*/
.byte 0x80, 0x37, 0x12, 0x40 /* PI BSD Domain 1 register */
.word 0x0000000F /* Clockrate setting */
.word 0x80000400 /* Entrypoint function (`entrypoint`) */
.word 0x0000144C /* Revision */
.word 0x917D18F6 /* Checksum 1 */
.word 0x69BC5453 /* Checksum 2 */
.word 0x00000000 /* Unknown */
.word 0x00000000 /* Unknown */
.ascii "THE LEGEND OF ZELDA " /* Internal ROM name */
.word 0x00000000 /* Unknown */
.word 0x0000004E /* Cartridge */
.ascii "ZL" /* Cartridge ID */
.ascii "P" /* Region */
.byte 0x0F /* Version */

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@ -51,6 +51,7 @@ DECLARE_ROM_SEGMENT(map_grand_static)
DECLARE_ROM_SEGMENT(map_i_static)
DECLARE_ROM_SEGMENT(map_48x85_static)
DECLARE_SEGMENT(code)
DECLARE_ROM_SEGMENT(code)
DECLARE_BSS_SEGMENT(code)

12
spec
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@ -4,12 +4,14 @@
beginseg
name "makerom"
include "build/baserom/makerom.o"
address 0x80000000
include "build/asm/rom_header.o"
include "build/asm/ipl3.o"
include "build/asm/entry.o"
endseg
beginseg
name "boot"
address 0x80000460
include "build/src/boot/boot_main.o"
include "build/src/boot/idle.o"
include "build/src/boot/viconfig.o"
@ -107,13 +109,11 @@ beginseg
include "build/src/libultra_boot_O1/__osGetHWIntrRoutine.o"
include "build/asm/__osSetWatchLo.o"
include "build/data/rsp_boot.text.o"
address 0x80000460
endseg
beginseg
name "dmadata"
include "build/asm/dmadata.o"
address 0x80016DA0
endseg
beginseg
@ -269,6 +269,7 @@ endseg
beginseg
name "code"
address 0x8001CE60
include "build/src/code/z_en_a_keep.o"
include "build/data/z_en_a_keep.data.o"
include "build/src/code/z_en_item00.o"
@ -574,7 +575,6 @@ beginseg
include "build/src/code/z_construct.o"
include "build/data/rsp.text.o"
include "build/data/rsp.rodata.o"
address 0x8001CE60
endseg
beginseg
@ -586,9 +586,9 @@ endseg
beginseg
name "ovl_title"
address 0x80800000
include "build/src/overlays/gamestates/ovl_title/z_title.o"
include "build/src/overlays/gamestates/ovl_title/z_title_reloc.o"
address 0x80800000
endseg
beginseg

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@ -2,7 +2,7 @@
#include <global.h>
#include <vt.h>
OSThread sMainThread;
OSThread gMainThread;
u8 sMainStack[0x900];
StackEntry sMainStackInfo;
OSMesg sPiMgrCmdBuff[50];
@ -24,7 +24,7 @@ void Main_ThreadEntry(void* arg0) {
DmaMgr_Start();
osSyncPrintf("codeセグメントロード中...");
var1 = osGetTime();
DmaMgr_SendRequest1((u32)_dmadataSegmentEnd, (u32)_codeSegmentRomStart, _codeSegmentRomEnd - _codeSegmentRomStart,
DmaMgr_SendRequest1(_codeSegmentStart, (u32)_codeSegmentRomStart, _codeSegmentRomEnd - _codeSegmentRomStart,
"../idle.c", 238);
var1 -= osGetTime();
osSyncPrintf("\rcodeセグメントロード中...完了\n");
@ -78,11 +78,11 @@ void Idle_ThreadEntry(void* a0) {
osViSetMode(&gViConfigMode);
ViConfig_UpdateVi(1);
osViBlack(1);
osViSwapBuffer(0x803da80);
osCreatePiManager(0x96, &gPiMgrCmdQ, sPiMgrCmdBuff, 0x32);
osViSwapBuffer(0x803DA80); //! @bug Invalid vram address (probably intended to be 0x803DA800)
osCreatePiManager(150, &gPiMgrCmdQ, sPiMgrCmdBuff, 50);
StackCheck_Init(&sMainStackInfo, sMainStack, sMainStack + sizeof(sMainStack), 0, 0x400, "main");
osCreateThread(&sMainThread, 3, Main_ThreadEntry, a0, sMainStack + sizeof(sMainStack), 10);
osStartThread(&sMainThread);
osCreateThread(&gMainThread, 3, Main_ThreadEntry, a0, sMainStack + sizeof(sMainStack), 10);
osStartThread(&gMainThread);
osSetThreadPri(NULL, 0);
while (1) {