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Decompile __osContDataCrc

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This commit is contained in:
Ryan Dwyer
2021-03-17 19:56:22 +10:00
parent 79a824e0f3
commit 6dbcff916f
7 changed files with 103 additions and 124 deletions
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ld/libfiles.inc
+1 -1
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@@ -212,7 +212,7 @@
build/ROMID/lib/ultra/os/yieldthread.o (section); \
build/ROMID/lib/ultra/io/si.o (section); \
build/ROMID/lib/ultra/os/probetlb.o (section); \
build/ROMID/lib/lib_51d50.o (section);
build/ROMID/lib/ultra/io/crc.o (section);
#if VERSION >= VERSION_PAL_FINAL
#define LIBFILES(section) \
src/include/lib/lib_51d50.h
-10
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@@ -1,10 +0,0 @@
#ifndef _IN_LIB_LIB_51D50_H
#define _IN_LIB_LIB_51D50_H
#include <ultra64.h>
#include "data.h"
#include "types.h"
u32 __osContAddressCrc(void);
u32 func00051e20(void);
#endif
src/lib/lib_4f5e0.c
-1
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@@ -3,7 +3,6 @@
#include "bss.h"
#include "lib/lib_16110.h"
#include "lib/lib_4f5e0.h"
#include "lib/lib_51d50.h"
#include "data.h"
#include "types.h"
src/lib/lib_51d50.c
-110
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@@ -1,110 +0,0 @@
#include <ultra64.h>
#include "constants.h"
#include "bss.h"
#include "data.h"
#include "types.h"
u8 __osContAddressCrc(u16 inaddr)
{
u32 crc;
u32 mask;
u32 addr = inaddr;
crc = 0;
for (mask = 0x400; mask != 0; mask >>= 1) {
crc *= 2;
if (addr & mask) {
if (crc & 0x20) {
crc ^= 20;
} else {
crc++;
}
} else {
if (crc & 0x20) {
crc ^= 21;
}
}
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
return crc & 0x1f;
}
GLOBAL_ASM(
glabel func00051e20
/* 51e20: 00802825 */ or $a1,$a0,$zero
/* 51e24: 00001825 */ or $v1,$zero,$zero
/* 51e28: 24020020 */ addiu $v0,$zero,0x20
.L00051e2c:
/* 51e2c: 24040080 */ addiu $a0,$zero,0x80
/* 51e30: 90a60000 */ lbu $a2,0x0($a1)
.L00051e34:
/* 51e34: 00037040 */ sll $t6,$v1,0x1
/* 51e38: 00c47824 */ and $t7,$a2,$a0
/* 51e3c: 11e00008 */ beqz $t7,.L00051e60
/* 51e40: 01c01825 */ or $v1,$t6,$zero
/* 51e44: 31d80100 */ andi $t8,$t6,0x100
/* 51e48: 13000003 */ beqz $t8,.L00051e58
/* 51e4c: 00000000 */ nop
/* 51e50: 10000007 */ b .L00051e70
/* 51e54: 39c30084 */ xori $v1,$t6,0x84
.L00051e58:
/* 51e58: 10000005 */ b .L00051e70
/* 51e5c: 24630001 */ addiu $v1,$v1,0x1
.L00051e60:
/* 51e60: 30680100 */ andi $t0,$v1,0x100
/* 51e64: 11000002 */ beqz $t0,.L00051e70
/* 51e68: 38690085 */ xori $t1,$v1,0x85
/* 51e6c: 01201825 */ or $v1,$t1,$zero
.L00051e70:
/* 51e70: 00045042 */ srl $t2,$a0,0x1
/* 51e74: 1540ffef */ bnez $t2,.L00051e34
/* 51e78: 01402025 */ or $a0,$t2,$zero
/* 51e7c: 2442ffff */ addiu $v0,$v0,-1
/* 51e80: 1440ffea */ bnez $v0,.L00051e2c
/* 51e84: 24a50001 */ addiu $a1,$a1,0x1
/* 51e88: 00035840 */ sll $t3,$v1,0x1
.L00051e8c:
/* 51e8c: 316c0100 */ andi $t4,$t3,0x100
/* 51e90: 11800002 */ beqz $t4,.L00051e9c
/* 51e94: 01601825 */ or $v1,$t3,$zero
/* 51e98: 39630085 */ xori $v1,$t3,0x85
.L00051e9c:
/* 51e9c: 24420001 */ addiu $v0,$v0,0x1
/* 51ea0: 2c410008 */ sltiu $at,$v0,0x8
/* 51ea4: 5420fff9 */ bnezl $at,.L00051e8c
/* 51ea8: 00035840 */ sll $t3,$v1,0x1
/* 51eac: 03e00008 */ jr $ra
/* 51eb0: 306200ff */ andi $v0,$v1,0xff
);
src/lib/ultra/io/contramread.c
+1 -1
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@@ -110,7 +110,7 @@ glabel __osContRamRead
/* 4b9dc: 00099903 */ sra $s3,$t1,0x4
/* 4b9e0: 56600014 */ bnezl $s3,.L0004ba34
/* 4b9e4: 24130001 */ addiu $s3,$zero,0x1
/* 4b9e8: 0c014788 */ jal func00051e20
/* 4b9e8: 0c014788 */ jal __osContDataCrc
/* 4b9ec: 02402025 */ or $a0,$s2,$zero
/* 4b9f0: 920b0026 */ lbu $t3,0x26($s0)
/* 4b9f4: 02402025 */ or $a0,$s2,$zero
src/lib/ultra/io/contramwrite.c
+1 -1
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@@ -108,7 +108,7 @@ glabel __osContRamWrite
/* 4b788: 24040001 */ addiu $a0,$zero,0x1
/* 4b78c: 0c012a34 */ jal __osSiRawStartDma
/* 4b790: 02602825 */ or $a1,$s3,$zero
/* 4b794: 0c014788 */ jal func00051e20
/* 4b794: 0c014788 */ jal __osContDataCrc
/* 4b798: 8fa40074 */ lw $a0,0x74($sp)
/* 4b79c: 305200ff */ andi $s2,$v0,0xff
/* 4b7a0: 02a02025 */ or $a0,$s5,$zero
src/lib/ultra/io/crc.c
+100
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@@ -0,0 +1,100 @@
#include <ultra64.h>
#include "constants.h"
#include "bss.h"
#include "data.h"
#include "types.h"
u8 __osContAddressCrc(u16 inaddr)
{
u32 crc;
u32 mask;
u32 addr = inaddr;
crc = 0;
for (mask = 0x400; mask != 0; mask >>= 1) {
crc *= 2;
if (addr & mask) {
if (crc & 0x20) {
crc ^= 20;
} else {
crc++;
}
} else {
if (crc & 0x20) {
crc ^= 21;
}
}
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
crc <<= 1;
if (crc & 0x20) {
crc ^= 21;
}
return crc & 0x1f;
}
u8 __osContDataCrc(u8 *data)
{
u32 i;
u32 mask;
u32 crc = 0;
for (i = 32; i != 0; i--) {
for (mask = 0x80; mask != 0; mask >>= 1) {
crc *= 2;
if (*data & mask) {
if (crc & 0x100) {
crc ^= 132;
} else {
crc++;
}
} else {
if (crc & 0x100) {
crc ^= 133;
}
}
}
data++;
}
do {
crc <<= 1;
if (crc & 0x100) {
crc ^= 133;
}
i++;
} while (i < 8);
return crc;
}