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decompile rng

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This commit is contained in:
YamaArashi 2017-02-02 16:30:08 -08:00
parent 39299306e0
commit 8f9ed6e585
11 changed files with 69 additions and 84 deletions
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6
asm/contest.s
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@ -850,7 +850,7 @@ sub_80D7DE8: @ 80D7DE8
adds r0, r5
ldr r1, =sub_80D80C8
str r1, [r0]
ldr r1, =gUnknown_03005D80
ldr r1, =gRngValue
ldr r0, =gUnknown_030060B8
ldr r0, [r0]
str r0, [r1]
@ -2191,7 +2191,7 @@ sub_80D8A88: @ 80D8A88
strb r0, [r1, 0x10]
ldr r0, [r2]
ldr r1, [r0]
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r0, [r0]
str r0, [r1, 0x18]
ldr r0, =gUnknown_02039F2A
@ -5369,7 +5369,7 @@ _080DA65C:
bl sub_80DF750
_080DA668:
ldr r1, =gUnknown_030060B8
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r0, [r0]
str r0, [r1]
ldr r4, =gStringVar4

4
asm/contest_link_80FC4F4.s
View File

@ -416,7 +416,7 @@ _080FC830:
lsls r0, 24
cmp r0, 0
beq _080FC880
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
movs r1, 0x4
bl sub_80FC4F4
cmp r0, 0x1
@ -429,7 +429,7 @@ _080FC858:
lsls r0, 24
cmp r0, 0
beq _080FC880
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r4, =gUnknown_020223C4
adds r1, r4, 0
movs r2, 0x4

65
asm/rng.s
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@ -1,65 +0,0 @@
.include "asm/macros.inc"
.include "constants/constants.inc"
.syntax unified
.text
thumb_func_start Random
@ u16 GenerateRandomNumber()
Random: @ 806F5CC
ldr r2, =gUnknown_03005D80
ldr r1, [r2]
ldr r0, =0x41c64e6d
muls r0, r1
ldr r1, =0x00006073
adds r0, r1
str r0, [r2]
ldr r2, =gUnknown_020249C0
ldr r1, [r2]
adds r1, 0x1
str r1, [r2]
lsrs r0, 16
bx lr
.pool
thumb_func_end Random
thumb_func_start SeedRng
@ void SeedRng(u16 seed)
SeedRng: @ 806F5F8
lsls r0, 16
lsrs r0, 16
ldr r1, =gUnknown_03005D80
str r0, [r1]
ldr r1, =gUnknown_020249BC
movs r0, 0
strb r0, [r1]
bx lr
.pool
thumb_func_end SeedRng
thumb_func_start SeedRng2
SeedRng2: @ 806F610
lsls r0, 16
lsrs r0, 16
ldr r1, =gUnknown_03005D84
str r0, [r1]
bx lr
.pool
thumb_func_end SeedRng2
thumb_func_start Random2
Random2: @ 806F620
ldr r2, =gUnknown_03005D84
ldr r1, [r2]
ldr r0, =0x41c64e6d
muls r0, r1
ldr r1, =0x00006073
adds r0, r1
str r0, [r2]
lsrs r0, 16
bx lr
.pool
thumb_func_end Random2
.align 2, 0 @ Don't pad with nop.

4
asm/rom_8034C54.s
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@ -13834,7 +13834,7 @@ _0803C628:
ldrb r0, [r0]
cmp r0, 0
bne _0803C690
ldr r1, =gUnknown_03005D80
ldr r1, =gRngValue
ldr r0, =gUnknown_0203BD30
ldr r0, [r0]
str r0, [r1]
@ -71061,7 +71061,7 @@ sub_805C158: @ 805C158
cmp r0, 0
bne _0805C194
ldr r1, =gUnknown_0203BD30
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r0, [r0]
str r0, [r1]
bl sub_805D19C

4
asm/rom_8184DA4.s
View File

@ -96,7 +96,7 @@ sub_8184E58: @ 8184E58
cmp r0, 0x1
bne _08184EA0
ldr r1, =gUnknown_0203BD2C
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r0, [r0]
str r0, [r1]
ldr r4, =gUnknown_0203C7AE
@ -111,7 +111,7 @@ sub_8184E58: @ 8184E58
_08184EA0:
cmp r0, 0x2
bne _08184EAC
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r1, =gUnknown_0203BD2C
ldr r1, [r1]
str r1, [r0]

4
asm/rom_81BAD84.s
View File

@ -60550,7 +60550,7 @@ _081DA284:
lsls r0, 24
cmp r0, 0
beq _081DA2D4
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
movs r1, 0x4
bl sub_80FC4F4
cmp r0, 0x1
@ -60563,7 +60563,7 @@ _081DA2AC:
lsls r0, 24
cmp r0, 0
beq _081DA2D4
ldr r0, =gUnknown_03005D80
ldr r0, =gRngValue
ldr r4, =gUnknown_020223C4
adds r1, r4, 0
movs r2, 0x4

18
include/rng.h Normal file
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@ -0,0 +1,18 @@
#ifndef GUARD_RNG_H
#define GUARD_RNG_H
extern u32 gRngValue;
extern u32 gRng2Value;
//Returns a 16-bit pseudorandom number
u16 Random(void);
u16 Random2(void);
//Returns a 32-bit pseudorandom number
#define Random32() (Random() | (Random() << 16))
//Sets the initial seed value of the pseudorandom number generator
void SeedRng(u16 seed);
void SeedRng2(u16 seed);
#endif // GUARD_RNG_H

2
ld_script.txt
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@ -60,7 +60,7 @@ SECTIONS {
asm/pokemon_2.o(.text);
asm/pokemon_3.o(.text);
asm/trig.o(.text);
asm/rng.o(.text);
src/rng.o(.text);
asm/util.o(.text);
asm/blend_palette.o(.text);
asm/daycare.o(.text);

35
src/rng.c Normal file
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@ -0,0 +1,35 @@
#include "global.h"
#include "rng.h"
// The number 1103515245 comes from the example implementation of rand and srand
// in the ISO C standard.
extern u32 gRngValue;
extern u32 gRng2Value;
EWRAM_DATA u8 sUnknown = 0;
EWRAM_DATA u32 sRandCount = 0;
u16 Random()
{
gRngValue = 1103515245 * gRngValue + 24691;
sRandCount++;
return gRngValue >> 16;
}
void SeedRng(u16 seed)
{
gRngValue = seed;
sUnknown = 0;
}
void SeedRng2(u16 seed)
{
gRng2Value = seed;
}
u16 Random2(void)
{
gRng2Value = 1103515245 * gRng2Value + 24691;
return gRng2Value >> 16;
}

4
sym_common.txt
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@ -267,10 +267,10 @@ gUnknown_03005D78: @ 3005D78
gUnknown_03005D7C: @ 3005D7C
.space 0x4
gUnknown_03005D80: @ 3005D80
gRngValue: @ 3005D80
.space 0x4
gUnknown_03005D84: @ 3005D84
gRng2Value: @ 3005D84
.space 0x4
gUnknown_03005D88: @ 3005D88

7
sym_ewram.txt
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@ -699,12 +699,9 @@ gUnknown_0202499C: @ 202499C
gUnknown_020249B4: @ 20249B4
.space 0x8
gUnknown_020249BC: @ 20249BC
.space 0x4
gUnknown_020249C0: @ 20249C0
.space 0x4
.include "src/rng.o"
.align 2
gUnknown_020249C4: @ 20249C4
.space 0x64