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Decompile osGetMemSize

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Ryan Dwyer 2022-10-16 18:50:22 +10:00
parent 5ca3b87ad4
commit 8c7d35da4a
2 changed files with 31 additions and 78 deletions
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1
Makefile
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@ -360,6 +360,7 @@ ifeq ($(COMPILER), ido)
src/lib/ultra/os/atomic.c \
src/lib/ultra/os/createmesgqueue.c \
src/lib/ultra/os/destroythread.c \
src/lib/ultra/os/getmemsize.c \
src/lib/ultra/os/gettime.c \
src/lib/ultra/os/initialize2.c \
src/lib/ultra/os/jammesg.c \

108
src/lib/ultra/os/getmemsize.c
View File

@ -2,81 +2,33 @@
#include <rcp.h>
#include <R4300.h>
#if MATCHING
GLOBAL_ASM(
glabel osGetMemSize
/* 4f530: 27bdfff0 */ addiu $sp,$sp,-16
/* 4f534: 3c0e0040 */ lui $t6,0x40
/* 4f538: afae0008 */ sw $t6,0x8($sp)
.NB0004f53c:
/* 4f53c: 8faf0008 */ lw $t7,0x8($sp)
/* 4f540: 3c01a000 */ lui $at,0xa000
/* 4f544: 3c19a000 */ lui $t9,0xa000
/* 4f548: 01e1c021 */ addu $t8,$t7,$at
/* 4f54c: afb8000c */ sw $t8,0xc($sp)
/* 4f550: 032fc821 */ addu $t9,$t9,$t7
/* 4f554: 8f390000 */ lw $t9,0x0($t9)
/* 4f558: 3c08a010 */ lui $t0,0xa010
/* 4f55c: 010f4021 */ addu $t0,$t0,$t7
/* 4f560: afb90004 */ sw $t9,0x4($sp)
/* 4f564: 8d08fffc */ lw $t0,-0x4($t0)
/* 4f568: 3c09a000 */ lui $t1,0xa000
/* 4f56c: 012f4821 */ addu $t1,$t1,$t7
/* 4f570: afa80000 */ sw $t0,0x0($sp)
/* 4f574: 8d290000 */ lw $t1,0x0($t1)
/* 4f578: 2401ffff */ addiu $at,$zero,-1
/* 4f57c: 3c0c0010 */ lui $t4,0x10
/* 4f580: 01215026 */ xor $t2,$t1,$at
/* 4f584: 3c01a000 */ lui $at,0xa000
/* 4f588: 002f0821 */ addu $at,$at,$t7
/* 4f58c: ac2a0000 */ sw $t2,0x0($at)
/* 4f590: 8fab000c */ lw $t3,0xc($sp)
/* 4f594: 2401ffff */ addiu $at,$zero,-1
/* 4f598: 018b6021 */ addu $t4,$t4,$t3
/* 4f59c: 8d8cfffc */ lw $t4,-0x4($t4)
/* 4f5a0: 01816826 */ xor $t5,$t4,$at
/* 4f5a4: 3c010010 */ lui $at,0x10
/* 4f5a8: 002b0821 */ addu $at,$at,$t3
/* 4f5ac: ac2dfffc */ sw $t5,-0x4($at)
/* 4f5b0: 8fae000c */ lw $t6,0xc($sp)
/* 4f5b4: 8fb90004 */ lw $t9,0x4($sp)
/* 4f5b8: 2401ffff */ addiu $at,$zero,-1
/* 4f5bc: 8dd80000 */ lw $t8,0x0($t6)
/* 4f5c0: 03214026 */ xor $t0,$t9,$at
/* 4f5c4: 17080009 */ bne $t8,$t0,.NB0004f5ec
/* 4f5c8: 00000000 */ sll $zero,$zero,0x0
/* 4f5cc: 3c090010 */ lui $t1,0x10
/* 4f5d0: 8faa0000 */ lw $t2,0x0($sp)
/* 4f5d4: 012e4821 */ addu $t1,$t1,$t6
/* 4f5d8: 8d29fffc */ lw $t1,-0x4($t1)
/* 4f5dc: 2401ffff */ addiu $at,$zero,-1
/* 4f5e0: 01417826 */ xor $t7,$t2,$at
/* 4f5e4: 112f0003 */ beq $t1,$t7,.NB0004f5f4
/* 4f5e8: 00000000 */ sll $zero,$zero,0x0
.NB0004f5ec:
/* 4f5ec: 10000013 */ beqz $zero,.NB0004f63c
/* 4f5f0: 8fa20008 */ lw $v0,0x8($sp)
.NB0004f5f4:
/* 4f5f4: 8fac0004 */ lw $t4,0x4($sp)
/* 4f5f8: 8fad000c */ lw $t5,0xc($sp)
/* 4f5fc: 3c010010 */ lui $at,0x10
/* 4f600: adac0000 */ sw $t4,0x0($t5)
/* 4f604: 8fb9000c */ lw $t9,0xc($sp)
/* 4f608: 8fab0000 */ lw $t3,0x0($sp)
/* 4f60c: 00390821 */ addu $at,$at,$t9
/* 4f610: ac2bfffc */ sw $t3,-0x4($at)
/* 4f614: 8fb80008 */ lw $t8,0x8($sp)
/* 4f618: 3c010010 */ lui $at,0x10
/* 4f61c: 03014021 */ addu $t0,$t8,$at
/* 4f620: afa80008 */ sw $t0,0x8($sp)
/* 4f624: 8fae0008 */ lw $t6,0x8($sp)
/* 4f628: 3c010080 */ lui $at,0x80
/* 4f62c: 01c1082b */ sltu $at,$t6,$at
/* 4f630: 1420ffc2 */ bnez $at,.NB0004f53c
/* 4f634: 00000000 */ sll $zero,$zero,0x0
/* 4f638: 8fa20008 */ lw $v0,0x8($sp)
.NB0004f63c:
/* 4f63c: 03e00008 */ jr $ra
/* 4f640: 27bd0010 */ addiu $sp,$sp,0x10
);
#endif
#define STEP 0x100000
u32 osGetMemSize(void)
{
u32* ptr;
u32 size = 0x400000;
u32 data0;
u32 data1;
while (size < 0x800000) {
ptr = (u32*) (0xA0000000 + size);
data0 = *ptr;
data1 = ptr[STEP / 4 - 1];
*ptr ^= ~0;
ptr[STEP / 4 - 1] ^= ~0;
if (*ptr != (data0 ^ ~0) || ptr[STEP / 4 - 1] != (data1 ^ ~0)) {
return size;
}
*ptr = data0;
ptr[STEP / 4 - 1] = data1;
size += STEP;
}
return size;
}