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Decompile dmaCheckPiracy

This commit is contained in:
Ryan Dwyer 2021-02-13 09:10:08 +10:00
parent 8f4fb21475
commit ce5c069fe1
3 changed files with 35 additions and 54 deletions
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1
src/include/constants.h
View File

@ -1135,6 +1135,7 @@
#define LIGHTOP_TURNON 6
#define LIGHTOP_TURNOFF 7
#define LOADSTATE_NONE 0
#define LOADSTATE_TILES 2
#define LOADSTATE_SETUP 4
#define LOADSTATE_PADS 5

2
src/include/lib/lib_0d0a0.h
View File

@ -7,7 +7,7 @@ void func0000d0a0(void);
void func0000d0f8(void *memaddr, void *romaddr, u32 len, bool arg3);
u32 xorDeadbeef(u32 value);
u32 xorDeadbabe(u32 value);
void func0000d29c(void *memaddr, u32 len);
void dmaCheckPiracy(void *memaddr, u32 len);
void func0000d350(void);
void func0000d410(void *memaddr, void *romaddr, u32 len);
void func0000d44c(void *memaddr, void *romaddr, u32 len);

86
src/lib/lib_0d0a0.c
View File

@ -160,57 +160,37 @@ u32 xorDeadbabe(u32 value)
return value ^ 0xdeadbabe;
}
GLOBAL_ASM(
glabel func0000d29c
/* d29c: 3c0e8006 */ lui $t6,%hi(g_LoadState)
/* d2a0: 91ced9a0 */ lbu $t6,%lo(g_LoadState)($t6)
/* d2a4: 27bdffd0 */ addiu $sp,$sp,-48
/* d2a8: afbf0014 */ sw $ra,0x14($sp)
/* d2ac: 11c00024 */ beqz $t6,.L0000d340
/* d2b0: 00803025 */ or $a2,$a0,$zero
/* d2b4: 2ca10081 */ sltiu $at,$a1,0x81
/* d2b8: 14200021 */ bnez $at,.L0000d340
/* d2bc: 3c04dd9d */ lui $a0,0xdd9d
/* d2c0: 348476cf */ ori $a0,$a0,0x76cf
/* d2c4: 0c00349f */ jal xorDeadbeef
/* d2c8: afa60030 */ sw $a2,0x30($sp)
/* d2cc: 8fa60030 */ lw $a2,0x30($sp)
/* d2d0: 00002025 */ or $a0,$zero,$zero
/* d2d4: 00c01825 */ or $v1,$a2,$zero
.L0000d2d8:
/* d2d8: 8c6f0000 */ lw $t7,0x0($v1)
/* d2dc: 24840001 */ addiu $a0,$a0,0x1
/* d2e0: 28810008 */ slti $at,$a0,0x8
/* d2e4: 01e2c026 */ xor $t8,$t7,$v0
/* d2e8: 24630004 */ addiu $v1,$v1,0x4
/* d2ec: 1420fffa */ bnez $at,.L0000d2d8
/* d2f0: ac78fffc */ sw $t8,-0x4($v1)
/* d2f4: 3c046ead */ lui $a0,0x6ead
/* d2f8: 3484b9fe */ ori $a0,$a0,0xb9fe
/* d2fc: 0c0034a3 */ jal xorDeadbabe
/* d300: afa60030 */ sw $a2,0x30($sp)
/* d304: 00402025 */ or $a0,$v0,$zero
/* d308: 0c013994 */ jal osPiReadIo
/* d30c: 27a50024 */ addiu $a1,$sp,0x24
/* d310: 8fa30030 */ lw $v1,0x30($sp)
/* d314: 00002025 */ or $a0,$zero,$zero
/* d318: 24020008 */ addiu $v0,$zero,0x8
.L0000d31c:
/* d31c: 8c790000 */ lw $t9,0x0($v1)
/* d320: 8fa80024 */ lw $t0,0x24($sp)
/* d324: 24840001 */ addiu $a0,$a0,0x1
/* d328: 24630004 */ addiu $v1,$v1,0x4
/* d32c: 03284826 */ xor $t1,$t9,$t0
/* d330: 1482fffa */ bne $a0,$v0,.L0000d31c
/* d334: ac69fffc */ sw $t1,-0x4($v1)
/* d338: 3c018006 */ lui $at,%hi(g_LoadState)
/* d33c: a020d9a0 */ sb $zero,%lo(g_LoadState)($at)
.L0000d340:
/* d340: 8fbf0014 */ lw $ra,0x14($sp)
/* d344: 27bd0030 */ addiu $sp,$sp,0x30
/* d348: 03e00008 */ jr $ra
/* d34c: 00000000 */ nop
);
/**
* This is executed after a DMA transfer. It xors the first 8 words with
* 0x0330c820, then reads a value from the boot loader (0x340 in ROM) which
* should be the same value, and xors the memory again with that value.
*/
void dmaCheckPiracy(void *memaddr, u32 len)
{
if (g_LoadState != LOADSTATE_NONE && len > 128) {
#if PIRACYCHECKS
u32 value = xorDeadbeef(0x0330c820 ^ 0xdeadbeef);
u32 *ptr = (u32 *)memaddr;
u32 data;
u32 devaddr;
s32 i;
for (i = 0; i < 8; i++) {
ptr[i] ^= value;
}
devaddr = xorDeadbabe(0xb0000340 ^ 0xdeadbabe);
osPiReadIo(devaddr, &data);
for (i = 0; i < 8; i++) {
ptr[i] ^= data;
}
#endif
g_LoadState = LOADSTATE_NONE;
}
}
GLOBAL_ASM(
glabel func0000d350
@ -272,14 +252,14 @@ void func0000d410(void *memaddr, void *romaddr, u32 len)
{
func0000d0f8(memaddr, romaddr, len, false);
func0000d350();
func0000d29c(memaddr, len);
dmaCheckPiracy(memaddr, len);
}
void func0000d44c(void *memaddr, void *romaddr, u32 len)
{
func0000d0f8(memaddr, romaddr, len, true);
func0000d350();
func0000d29c(memaddr, len);
dmaCheckPiracy(memaddr, len);
}
GLOBAL_ASM(