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decompile malloc

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This commit is contained in:
sceptillion
2017-12-18 00:47:25 -08:00
parent 4265e36174
commit d1437d30f7
7 changed files with 242 additions and 459 deletions
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asm/malloc.s
-423
View File
@@ -1,423 +0,0 @@
.include "asm/macros.inc"
.include "constants/constants.inc"
.syntax unified
.text
thumb_func_start PutMemBlockHeader
PutMemBlockHeader: @ 800292C
push {r4,lr}
movs r4, 0
strh r4, [r0]
ldr r4, _08002944 @ =0x0000a3a3
strh r4, [r0, 0x2]
str r3, [r0, 0x4]
str r1, [r0, 0x8]
str r2, [r0, 0xC]
pop {r4}
pop {r0}
bx r0
.align 2, 0
_08002944: .4byte 0x0000a3a3
thumb_func_end PutMemBlockHeader
thumb_func_start PutFirstMemBlockHeader
PutFirstMemBlockHeader: @ 8002948
push {lr}
adds r2, r0, 0
adds r3, r1, 0
subs r3, 0x10
adds r1, r2, 0
bl PutMemBlockHeader
pop {r0}
bx r0
thumb_func_end PutFirstMemBlockHeader
thumb_func_start sub_800295C
sub_800295C: @ 800295C
push {r4-r7,lr}
adds r5, r1, 0
ldr r2, _08002998 @ =gUnknown_2020004
str r0, [r2]
ldr r1, _0800299C @ =gUnknown_2020008
str r0, [r1]
movs r0, 0x3
ands r0, r5
cmp r0, 0
beq _08002976
lsrs r0, r5, 2
adds r0, 0x1
lsls r5, r0, 2
_08002976:
adds r6, r1, 0
ldr r7, _080029A0 @ =gUnknown_202000C
_0800297A:
ldr r4, [r6]
ldrh r0, [r4]
cmp r0, 0
bne _080029DC
ldr r3, [r4, 0x4]
cmp r3, r5
bcc _080029DC
subs r0, r3, r5
cmp r0, 0x1F
bhi _080029A4
movs r0, 0x1
strh r0, [r4]
adds r0, r4, 0
adds r0, 0x10
b _080029F8
.align 2, 0
_08002998: .4byte gUnknown_2020004
_0800299C: .4byte gUnknown_2020008
_080029A0: .4byte gUnknown_202000C
_080029A4:
subs r3, 0x10
subs r3, r5
adds r0, r5, 0
adds r0, 0x10
adds r0, r4, r0
str r0, [r7]
movs r1, 0x1
strh r1, [r4]
str r5, [r4, 0x4]
ldr r2, [r4, 0xC]
adds r1, r4, 0
bl PutMemBlockHeader
ldr r0, [r6]
ldr r1, [r7]
str r1, [r0, 0xC]
ldr r0, _080029D8 @ =gUnknown_2020004
ldr r2, [r1, 0xC]
ldr r0, [r0]
cmp r2, r0
beq _080029D0
str r1, [r2, 0x8]
_080029D0:
ldr r0, [r6]
adds r0, 0x10
b _080029F8
.align 2, 0
_080029D8: .4byte gUnknown_2020004
_080029DC:
ldr r0, [r1]
ldr r3, [r0, 0xC]
ldr r0, [r2]
cmp r3, r0
beq _080029EA
str r3, [r1]
b _0800297A
_080029EA:
ldr r0, _08002A00 @ =gUnknown_81E9F68
movs r1, 0xAE
ldr r2, _08002A04 @ =gUnknown_81E9FA0
movs r3, 0x1
bl AGBAssert
movs r0, 0
_080029F8:
pop {r4-r7}
pop {r1}
bx r1
.align 2, 0
_08002A00: .4byte gUnknown_81E9F68
_08002A04: .4byte gUnknown_81E9FA0
thumb_func_end sub_800295C
thumb_func_start sub_8002A08
sub_8002A08: @ 8002A08
push {r4-r7,lr}
cmp r1, 0
bne _08002A24
ldr r0, _08002A1C @ =gUnknown_81E9F68
ldr r2, _08002A20 @ =gUnknown_81E9FA4
movs r1, 0xC3
movs r3, 0x1
bl AGBAssert
b _08002ACA
.align 2, 0
_08002A1C: .4byte gUnknown_81E9F68
_08002A20: .4byte gUnknown_81E9FA4
_08002A24:
adds r6, r0, 0
adds r4, r1, 0
subs r4, 0x10
ldrh r0, [r4, 0x2]
ldr r7, _08002AD0 @ =0x0000a3a3
cmp r0, r7
beq _08002A3E
ldr r0, _08002AD4 @ =gUnknown_81E9F68
ldr r2, _08002AD8 @ =gUnknown_81E9FB0
movs r1, 0xCC
movs r3, 0x1
bl AGBAssert
_08002A3E:
ldrh r0, [r4]
cmp r0, 0x1
beq _08002A50
ldr r0, _08002AD4 @ =gUnknown_81E9F68
ldr r2, _08002ADC @ =gUnknown_81E9FD8
movs r1, 0xCD
movs r3, 0x1
bl AGBAssert
_08002A50:
movs r0, 0
strh r0, [r4]
ldr r0, [r4, 0xC]
cmp r0, r6
beq _08002A8C
ldrh r5, [r0]
cmp r5, 0
bne _08002A8C
ldrh r0, [r0, 0x2]
cmp r0, r7
beq _08002A72
ldr r0, _08002AD4 @ =gUnknown_81E9F68
ldr r2, _08002AE0 @ =gUnknown_81E9FEC
movs r1, 0xD3
movs r3, 0x1
bl AGBAssert
_08002A72:
ldr r0, [r4, 0x4]
adds r0, 0x10
ldr r2, [r4, 0xC]
ldr r1, [r2, 0x4]
adds r0, r1
str r0, [r4, 0x4]
strh r5, [r2, 0x2]
ldr r0, [r4, 0xC]
ldr r0, [r0, 0xC]
str r0, [r4, 0xC]
cmp r0, r6
beq _08002A8C
str r4, [r0, 0x8]
_08002A8C:
cmp r4, r6
beq _08002ACA
ldr r0, [r4, 0x8]
ldrh r5, [r0]
cmp r5, 0
bne _08002ACA
ldrh r1, [r0, 0x2]
ldr r0, _08002AD0 @ =0x0000a3a3
cmp r1, r0
beq _08002AAC
ldr r0, _08002AD4 @ =gUnknown_81E9F68
ldr r2, _08002AE4 @ =gUnknown_81EA018
movs r1, 0xE4
movs r3, 0x1
bl AGBAssert
_08002AAC:
ldr r1, [r4, 0x8]
ldr r0, [r4, 0xC]
str r0, [r1, 0xC]
ldr r1, [r4, 0xC]
cmp r1, r6
beq _08002ABC
ldr r0, [r4, 0x8]
str r0, [r1, 0x8]
_08002ABC:
strh r5, [r4, 0x2]
ldr r0, [r4, 0x8]
ldr r1, [r0, 0x4]
adds r1, 0x10
ldr r2, [r4, 0x4]
adds r1, r2
str r1, [r0, 0x4]
_08002ACA:
pop {r4-r7}
pop {r0}
bx r0
.align 2, 0
_08002AD0: .4byte 0x0000a3a3
_08002AD4: .4byte gUnknown_81E9F68
_08002AD8: .4byte gUnknown_81E9FB0
_08002ADC: .4byte gUnknown_81E9FD8
_08002AE0: .4byte gUnknown_81E9FEC
_08002AE4: .4byte gUnknown_81EA018
thumb_func_end sub_8002A08
thumb_func_start AllocZeroedInternal
AllocZeroedInternal: @ 8002AE8
push {r4,r5,lr}
sub sp, 0x4
adds r4, r1, 0
bl sub_800295C
adds r5, r0, 0
cmp r5, 0
beq _08002B1C
movs r0, 0x3
ands r0, r4
cmp r0, 0
beq _08002B06
lsrs r0, r4, 2
adds r0, 0x1
lsls r4, r0, 2
_08002B06:
movs r0, 0
str r0, [sp]
lsls r2, r4, 9
lsrs r2, 11
movs r0, 0xA0
lsls r0, 19
orrs r2, r0
mov r0, sp
adds r1, r5, 0
bl CpuSet
_08002B1C:
adds r0, r5, 0
add sp, 0x4
pop {r4,r5}
pop {r1}
bx r1
thumb_func_end AllocZeroedInternal
thumb_func_start CheckMemBlockInternal
CheckMemBlockInternal: @ 8002B28
push {r4,r5,lr}
adds r5, r0, 0
adds r3, r1, 0
subs r3, 0x10
ldrh r2, [r3, 0x2]
ldr r0, _08002B74 @ =0x0000a3a3
cmp r2, r0
bne _08002B6E
ldr r0, [r3, 0xC]
ldrh r1, [r0, 0x2]
adds r4, r0, 0
cmp r1, r2
bne _08002B6E
cmp r4, r5
beq _08002B4C
ldr r0, [r4, 0x8]
cmp r0, r3
bne _08002B6E
_08002B4C:
ldr r2, [r3, 0x8]
ldrh r1, [r2, 0x2]
ldr r0, _08002B74 @ =0x0000a3a3
cmp r1, r0
bne _08002B6E
cmp r2, r5
beq _08002B60
ldr r0, [r2, 0xC]
cmp r0, r3
bne _08002B6E
_08002B60:
cmp r4, r5
beq _08002B78
ldr r0, [r3, 0x4]
adds r0, 0x10
adds r0, r3, r0
cmp r4, r0
beq _08002B78
_08002B6E:
movs r0, 0
b _08002B7A
.align 2, 0
_08002B74: .4byte 0x0000a3a3
_08002B78:
movs r0, 0x1
_08002B7A:
pop {r4,r5}
pop {r1}
bx r1
thumb_func_end CheckMemBlockInternal
thumb_func_start InitHeap
InitHeap: @ 8002B80
push {lr}
ldr r2, _08002B94 @ =gUnknown_3000A38
str r0, [r2]
ldr r2, _08002B98 @ =gUnknown_3000A3C
str r1, [r2]
bl PutFirstMemBlockHeader
pop {r0}
bx r0
.align 2, 0
_08002B94: .4byte gUnknown_3000A38
_08002B98: .4byte gUnknown_3000A3C
thumb_func_end InitHeap
thumb_func_start Alloc
Alloc: @ 8002B9C
push {lr}
adds r1, r0, 0
ldr r0, _08002BAC @ =gUnknown_3000A38
ldr r0, [r0]
bl sub_800295C
pop {r1}
bx r1
.align 2, 0
_08002BAC: .4byte gUnknown_3000A38
thumb_func_end Alloc
thumb_func_start AllocZeroed
AllocZeroed: @ 8002BB0
push {lr}
adds r1, r0, 0
ldr r0, _08002BC0 @ =gUnknown_3000A38
ldr r0, [r0]
bl AllocZeroedInternal
pop {r1}
bx r1
.align 2, 0
_08002BC0: .4byte gUnknown_3000A38
thumb_func_end AllocZeroed
thumb_func_start Free
Free: @ 8002BC4
push {lr}
adds r1, r0, 0
ldr r0, _08002BD4 @ =gUnknown_3000A38
ldr r0, [r0]
bl sub_8002A08
pop {r0}
bx r0
.align 2, 0
_08002BD4: .4byte gUnknown_3000A38
thumb_func_end Free
thumb_func_start CheckMemBlock
CheckMemBlock: @ 8002BD8
push {lr}
adds r1, r0, 0
ldr r0, _08002BE8 @ =gUnknown_3000A38
ldr r0, [r0]
bl CheckMemBlockInternal
pop {r1}
bx r1
.align 2, 0
_08002BE8: .4byte gUnknown_3000A38
thumb_func_end CheckMemBlock
thumb_func_start CheckHeap
CheckHeap: @ 8002BEC
push {r4,r5,lr}
ldr r0, _08002C10 @ =gUnknown_3000A38
ldr r4, [r0]
adds r5, r0, 0
_08002BF4:
ldr r0, [r5]
adds r1, r4, 0
adds r1, 0x10
bl CheckMemBlockInternal
cmp r0, 0
beq _08002C14
ldr r4, [r4, 0xC]
ldr r0, [r5]
cmp r4, r0
bne _08002BF4
movs r0, 0x1
b _08002C16
.align 2, 0
_08002C10: .4byte gUnknown_3000A38
_08002C14:
movs r0, 0
_08002C16:
pop {r4,r5}
pop {r1}
bx r1
thumb_func_end CheckHeap
.align 2, 0 @ Don't pad with nop.
data/data.s
-21
View File
@@ -1,26 +1,5 @@
.section .rodata
gUnknown_81E9F68:: @ 81E9F68
.incbin "baserom.gba", 0x1E9F68, 0x38
gUnknown_81E9FA0:: @ 81E9FA0
.incbin "baserom.gba", 0x1E9FA0, 0x4
gUnknown_81E9FA4:: @ 81E9FA4
.incbin "baserom.gba", 0x1E9FA4, 0xC
gUnknown_81E9FB0:: @ 81E9FB0
.incbin "baserom.gba", 0x1E9FB0, 0x28
gUnknown_81E9FD8:: @ 81E9FD8
.incbin "baserom.gba", 0x1E9FD8, 0x14
gUnknown_81E9FEC:: @ 81E9FEC
.incbin "baserom.gba", 0x1E9FEC, 0x2C
gUnknown_81EA018:: @ 81EA018
.incbin "baserom.gba", 0x1EA018, 0x2C
gUnknown_81EA044:: @ 81EA044
.incbin "baserom.gba", 0x1EA044, 0x100
include/gba/isagbprint.h
+14
View File
@@ -33,4 +33,18 @@ void AGBAssert(const char *pFile, int nLine, const char *pExpression, int nStopP
#define AGB_WARNING(exp) (exp) ? ((void*)0) : AGBAssert(__FILE__, __LINE__, #exp, 0);
#endif
// for matching purposes
#ifdef NDEBUG
#define AGB_ASSERT_EX(exp, file, line)
#else
#define AGB_ASSERT_EX(exp, file, line) (exp) ? ((void*)0) : AGBAssert(file, line, #exp, 1);
#endif
#ifdef NDEBUG
#define AGB_WARNING_EX(exp, file, line)
#else
#define AGB_WARNING_EX(exp, file, line) (exp) ? ((void*)0) : AGBAssert(file, line, #exp, 0);
#endif
#endif // GUARD_GBA_ISAGBPRINT_H
ld_script.txt
+2 -1
View File
@@ -86,7 +86,7 @@ SECTIONS {
src/gpu_regs.o(.text);
src/dma3_manager.o(.text);
src/bg.o(.text);
asm/malloc.o(.text);
src/malloc.o(.text);
asm/text_printer.o(.text);
asm/window.o(.text);
asm/blit.o(.text);
@@ -393,6 +393,7 @@ SECTIONS {
{
src/main.o(.rodata);
src/bg.o(.rodata);
src/malloc.o(.rodata);
data/data.o(.rodata);
src/m4a_tables.o(.rodata);
data/sound_data.o(.rodata);
src/malloc.c
+224
View File
@@ -0,0 +1,224 @@
#include "global.h"
static void *sHeapStart;
static u32 sHeapSize;
static EWRAM_DATA struct MemBlock *head = NULL;
static EWRAM_DATA struct MemBlock *pos = NULL;
static EWRAM_DATA struct MemBlock *splitBlock = NULL;
#define MALLOC_SYSTEM_ID 0xA3A3
struct MemBlock {
// Whether this block is currently allocated.
bool16 flag;
// Magic number used for error checking. Should equal MALLOC_SYSTEM_ID.
u16 magic_number;
// Size of the block (not including this header struct).
u32 size;
// Previous block pointer. Equals sHeapStart if this is the first block.
struct MemBlock *prev;
// Next block pointer. Equals sHeapStart if this is the last block.
struct MemBlock *next;
// Data in the memory block. (Arrays of length 0 are a GNU extension.)
u8 data[0];
};
void PutMemBlockHeader(void *block, struct MemBlock *prev, struct MemBlock *next, u32 size)
{
struct MemBlock *header = (struct MemBlock *)block;
header->flag = FALSE;
header->magic_number = MALLOC_SYSTEM_ID;
header->size = size;
header->prev = prev;
header->next = next;
}
void PutFirstMemBlockHeader(void *block, u32 size)
{
PutMemBlockHeader(block, (struct MemBlock *)block, (struct MemBlock *)block, size - sizeof(struct MemBlock));
}
void *AllocInternal(void *heapStart, u32 size)
{
u32 foundBlockSize;
head = (struct MemBlock *)heapStart;
pos = head;
// Alignment
if (size & 3)
size = 4 * ((size / 4) + 1);
for (;;) {
// Loop through the blocks looking for unused block that's big enough.
if (!pos->flag) {
foundBlockSize = pos->size;
if (foundBlockSize >= size) {
if (foundBlockSize - size < 2 * sizeof(struct MemBlock)) {
// The block isn't much bigger than the requested size,
// so just use it.
pos->flag = TRUE;
return pos->data;
} else {
// The block is significantly bigger than the requested
// size, so split the rest into a separate block.
int splitBlockSize = foundBlockSize;
splitBlockSize -= sizeof(struct MemBlock);
splitBlockSize -= size;
splitBlock = (struct MemBlock *)(pos->data + size);
pos->flag = TRUE;
pos->size = size;
PutMemBlockHeader(splitBlock, pos, pos->next, splitBlockSize);
pos->next = splitBlock;
if (splitBlock->next != head)
splitBlock->next->prev = splitBlock;
return pos->data;
}
}
}
if (pos->next == head)
{
AGB_ASSERT_EX(0, "C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c", 174);
return NULL;
}
pos = pos->next;
}
}
void FreeInternal(void *heapStart, void *p)
{
AGB_ASSERT_EX(p != NULL, "C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c", 195);
if (p) {
struct MemBlock *head = (struct MemBlock *)heapStart;
struct MemBlock *pos = (struct MemBlock *)((u8 *)p - sizeof(struct MemBlock));
AGB_ASSERT_EX(pos->magic_number == MALLOC_SYSTEM_ID, "C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c", 204);
AGB_ASSERT_EX(pos->flag == TRUE, "C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c", 205);
pos->flag = FALSE;
// If the freed block isn't the last one, merge with the next block
// if it's not in use.
if (pos->next != head) {
if (!pos->next->flag) {
AGB_ASSERT_EX(pos->next->magic_number == MALLOC_SYSTEM_ID, "C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c", 211);
pos->size += sizeof(struct MemBlock) + pos->next->size;
pos->next->magic_number = 0;
pos->next = pos->next->next;
if (pos->next != head)
pos->next->prev = pos;
}
}
// If the freed block isn't the first one, merge with the previous block
// if it's not in use.
if (pos != head) {
if (!pos->prev->flag) {
AGB_ASSERT_EX(pos->prev->magic_number == MALLOC_SYSTEM_ID, "C:/WORK/POKeFRLG/src/pm_lgfr_ose/source/gflib/malloc.c", 228);
pos->prev->next = pos->next;
if (pos->next != head)
pos->next->prev = pos->prev;
pos->magic_number = 0;
pos->prev->size += sizeof(struct MemBlock) + pos->size;
}
}
}
}
void *AllocZeroedInternal(void *heapStart, u32 size)
{
void *mem = AllocInternal(heapStart, size);
if (mem != NULL) {
if (size & 3)
size = 4 * ((size / 4) + 1);
CpuFill32(0, mem, size);
}
return mem;
}
bool32 CheckMemBlockInternal(void *heapStart, void *pointer)
{
struct MemBlock *head = (struct MemBlock *)heapStart;
struct MemBlock *block = (struct MemBlock *)((u8 *)pointer - sizeof(struct MemBlock));
if (block->magic_number != MALLOC_SYSTEM_ID)
return FALSE;
if (block->next->magic_number != MALLOC_SYSTEM_ID)
return FALSE;
if (block->next != head && block->next->prev != block)
return FALSE;
if (block->prev->magic_number != MALLOC_SYSTEM_ID)
return FALSE;
if (block->prev != head && block->prev->next != block)
return FALSE;
if (block->next != head && block->next != (struct MemBlock *)(block->data + block->size))
return FALSE;
return TRUE;
}
void InitHeap(void *heapStart, u32 heapSize)
{
sHeapStart = heapStart;
sHeapSize = heapSize;
PutFirstMemBlockHeader(heapStart, heapSize);
}
void *Alloc(u32 size)
{
AllocInternal(sHeapStart, size);
}
void *AllocZeroed(u32 size)
{
AllocZeroedInternal(sHeapStart, size);
}
void Free(void *pointer)
{
FreeInternal(sHeapStart, pointer);
}
bool32 CheckMemBlock(void *pointer)
{
return CheckMemBlockInternal(sHeapStart, pointer);
}
bool32 CheckHeap()
{
struct MemBlock *pos = (struct MemBlock *)sHeapStart;
do {
if (!CheckMemBlockInternal(sHeapStart, pos->data))
return FALSE;
pos = pos->next;
} while (pos != (struct MemBlock *)sHeapStart);
return TRUE;
}
sym_bss.txt
+1 -6
View File
@@ -7,14 +7,9 @@
.space 0x4
.include "src/bg.o"
.include "src/malloc.o"
.align 2
gUnknown_3000A38: @ 3000A38
.space 0x4
gUnknown_3000A3C: @ 3000A3C
.space 0x4
gUnknown_3000A40: @ 3000A40
.space 0xA2
sym_ewram.txt
+1 -8
View File
@@ -28,14 +28,7 @@ gUnknown_201FF00: @ 201FF00
gTrainerId: @ 2020000
.space 0x4
gUnknown_2020004: @ 2020004
.space 0x4
gUnknown_2020008: @ 2020008
.space 0x4
gUnknown_202000C: @ 202000C
.space 0x4
.include "src/malloc.o"
gUnknown_2020010: @ 2020010
.space 0x24