Difference between revisions of "C51 Malloc"
Jump to navigation
Jump to search
(Created page with "<font face='Courier New'> 00044414: 27bdfff8 addiu r29,r29,0xfff8 00044418: 00002821 addu r5,r0,r0 0004441c: 000432c2 srl r6,r4,0x0b 00044420: 308407ff andi r4,r4,0x07ff...") |
|||
| Line 1: | Line 1: | ||
<font face='Courier New'> | <font face='Courier New'> | ||
| + | |||
| + | Judges the size of something? loops in a really odd fashion until 0x8004e9d4 + r4 != 0 | ||
| + | grabs something from very close to the beginning of scus, which seems to point to the stack? | ||
00044414: 27bdfff8 addiu r29,r29,0xfff8 | 00044414: 27bdfff8 addiu r29,r29,0xfff8 | ||
| − | 00044418: 00002821 addu r5,r0,r0 | + | 00044418: 00002821 addu r5,r0,r0 #r5 = 0 |
| − | 0004441c: 000432c2 srl r6,r4,0x0b | + | 0004441c: 000432c2 srl r6,r4,0x0b #r6 = input >> 0xb (0x800 to 0x1) |
| − | 00044420: 308407ff andi r4,r4,0x07ff | + | 00044420: 308407ff andi r4,r4,0x07ff # |
| − | 00044424: 10800002 beq r4,r0,0x00044430 | + | 00044424: 10800002 beq r4,r0,0x00044430 #branch if input && 0x07ff is 0 |
| − | 00044428: 34070001 ori r7,r0,0x0001 | + | 00044428: 34070001 ori r7,r0,0x0001 #r7 = 1 |
| − | 0004442c: 24c60001 addiu r6,r6,0x0001 | + | 0004442c: 24c60001 addiu r6,r6,0x0001 #r6 = Ceil(input>>0xb) |
| − | 00044430: 00002021 addu r4,r0,r0 | + | 00044430: 00002021 addu r4,r0,r0 #r4 = 0 |
00044434: 3c018005 lui r1,0x8005 | 00044434: 3c018005 lui r1,0x8005 | ||
00044438: 00240821 addu r1,r1,r4 | 00044438: 00240821 addu r1,r1,r4 | ||
| − | 0004443c: 9023e9d4 lbu r3,-0x162c(r1) | + | 0004443c: 9023e9d4 lbu r3,-0x162c(r1) #loads byte from 0x8004e9d4 + r4 |
00044440: 00000000 nop | 00044440: 00000000 nop | ||
| − | 00044444: 1460000a bne r3,r0,0x00044470 | + | 00044444: 1460000a bne r3,r0,0x00044470 #branch if not 0 |
| − | 00044448: 0067102b sltu r2,r3,r7 | + | 00044448: 0067102b sltu r2,r3,r7 #true if r3 > 1 |
0004444c: 14a00002 bne r5,r0,0x00044458 | 0004444c: 14a00002 bne r5,r0,0x00044458 | ||
00044450: 00000000 nop | 00044450: 00000000 nop | ||
| − | 00044454: 00804021 addu r8,r4,r0 | + | 00044454: 00804021 addu r8,r4,r0 #r8 = r4 |
| − | 00044458: 24a50001 addiu r5,r5,0x0001 | + | 00044458: 24a50001 addiu r5,r5,0x0001 #r5 + 1 |
| − | 0004445c: 00a6102b sltu r2,r5,r6 | + | 0004445c: 00a6102b sltu r2,r5,r6 #set true if r5 < Ceil(input>>0xb) |
| − | 00044460: 1040000c beq r2,r0,0x00044494 | + | 00044460: 1040000c beq r2,r0,0x00044494 #branch until true |
00044464: 00000000 nop | 00044464: 00000000 nop | ||
00044468: 08011120 j 0x00044480 | 00044468: 08011120 j 0x00044480 | ||
| − | 0004446c: 24840001 addiu r4,r4,0x0001 | + | 0004446c: 24840001 addiu r4,r4,0x0001 #r4 + 1 |
| − | 00044470: 14400002 bne r2,r0,0x0004447c | + | 00044470: 14400002 bne r2,r0,0x0004447c #branch if r2 != 0 |
| − | 00044474: 00002821 addu r5,r0,r0 | + | 00044474: 00002821 addu r5,r0,r0 #r5 = 0 |
| − | 00044478: 24670001 addiu r7,r3,0x0001 | + | 00044478: 24670001 addiu r7,r3,0x0001 #r7 = byte + 1 |
| − | 0004447c: 24840001 addiu r4,r4,0x0001 | + | 0004447c: 24840001 addiu r4,r4,0x0001 #r4 + 1 |
| − | 00044480: 2c820040 sltiu r2,r4,0x0040 | + | 00044480: 2c820040 sltiu r2,r4,0x0040 #set true if r4 < 0x40 |
| − | 00044484: 1440ffeb bne r2,r0,0x00044434 | + | 00044484: 1440ffeb bne r2,r0,0x00044434 #loop if untrue |
| − | 00044488: 00a6102b sltu r2,r5,r6 | + | 00044488: 00a6102b sltu r2,r5,r6 #set true if r5 < Ceil(input>>0xb) |
| − | 0004448c: 14400010 bne r2,r0,0x000444d0 | + | 0004448c: 14400010 bne r2,r0,0x000444d0 #branch if so |
| − | 00044490: 00001021 addu r2,r0,r0 | + | 00044490: 00001021 addu r2,r0,r0 #r2 = 0 |
| − | 00044494: 10a0000a beq r5,r0,0x000444c0 | + | 00044494: 10a0000a beq r5,r0,0x000444c0 #branch if r5 = 0 |
| − | 00044498: 00002021 addu r4,r0,r0 | + | 00044498: 00002021 addu r4,r0,r0 #r4 = 0 |
0004449c: 3c038005 lui r3,0x8005 | 0004449c: 3c038005 lui r3,0x8005 | ||
| − | 000444a0: 2463e9d4 addiu r3,r3, | + | 000444a0: 2463e9d4 addiu r3,r3,-0x162c #r3 = 0x8004e9d4 |
| − | 000444a4: 01041021 addu r2,r8,r4 | + | 000444a4: 01041021 addu r2,r8,r4 #r2 = r8 + r4 |
| − | 000444a8: 00431021 addu r2,r2,r3 | + | 000444a8: 00431021 addu r2,r2,r3 #r2 = 0x8004e9d4 + r8 + r4 |
| − | 000444ac: a0470000 sb r7,0x0000(r2) | + | 000444ac: a0470000 sb r7,0x0000(r2) #save r7 |
| − | 000444b0: 24840001 addiu r4,r4,0x0001 | + | 000444b0: 24840001 addiu r4,r4,0x0001 #r4 + 1 |
| − | 000444b4: 0085102b sltu r2,r4,r5 | + | 000444b4: 0085102b sltu r2,r4,r5 #set true if r5 counter < r4 counter |
| − | 000444b8: 1440fffa bne r2,r0,0x000444a4 | + | 000444b8: 1440fffa bne r2,r0,0x000444a4 #loop above until r4 => r5 (?) |
000444bc: 00000000 nop | 000444bc: 00000000 nop | ||
000444c0: 3c038001 lui r3,0x8001 | 000444c0: 3c038001 lui r3,0x8001 | ||
| − | 000444c4: 8c630010 lw r3,0x0010(r3) | + | 000444c4: 8c630010 lw r3,0x0010(r3) #loads either a very large number, or a stack pointer. (0x801df000?) |
| − | 000444c8: 000812c0 sll r2,r8,0x0b | + | 000444c8: 000812c0 sll r2,r8,0x0b #r2 = r8 << 0xb |
| − | 000444cc: 00431021 addu r2,r2,r3 | + | 000444cc: 00431021 addu r2,r2,r3 #r2 + 801df000? |
000444d0: 27bd0008 addiu r29,r29,0x0008 | 000444d0: 27bd0008 addiu r29,r29,0x0008 | ||
000444d4: 03e00008 jr r31 | 000444d4: 03e00008 jr r31 | ||
000444d8: 00000000 nop | 000444d8: 00000000 nop | ||
</font> | </font> | ||
Revision as of 08:11, 14 January 2022
Judges the size of something? loops in a really odd fashion until 0x8004e9d4 + r4 != 0 grabs something from very close to the beginning of scus, which seems to point to the stack? 00044414: 27bdfff8 addiu r29,r29,0xfff8 00044418: 00002821 addu r5,r0,r0 #r5 = 0 0004441c: 000432c2 srl r6,r4,0x0b #r6 = input >> 0xb (0x800 to 0x1) 00044420: 308407ff andi r4,r4,0x07ff # 00044424: 10800002 beq r4,r0,0x00044430 #branch if input && 0x07ff is 0 00044428: 34070001 ori r7,r0,0x0001 #r7 = 1 0004442c: 24c60001 addiu r6,r6,0x0001 #r6 = Ceil(input>>0xb) 00044430: 00002021 addu r4,r0,r0 #r4 = 0 00044434: 3c018005 lui r1,0x8005 00044438: 00240821 addu r1,r1,r4 0004443c: 9023e9d4 lbu r3,-0x162c(r1) #loads byte from 0x8004e9d4 + r4 00044440: 00000000 nop 00044444: 1460000a bne r3,r0,0x00044470 #branch if not 0 00044448: 0067102b sltu r2,r3,r7 #true if r3 > 1 0004444c: 14a00002 bne r5,r0,0x00044458 00044450: 00000000 nop 00044454: 00804021 addu r8,r4,r0 #r8 = r4 00044458: 24a50001 addiu r5,r5,0x0001 #r5 + 1 0004445c: 00a6102b sltu r2,r5,r6 #set true if r5 < Ceil(input>>0xb) 00044460: 1040000c beq r2,r0,0x00044494 #branch until true 00044464: 00000000 nop 00044468: 08011120 j 0x00044480 0004446c: 24840001 addiu r4,r4,0x0001 #r4 + 1 00044470: 14400002 bne r2,r0,0x0004447c #branch if r2 != 0 00044474: 00002821 addu r5,r0,r0 #r5 = 0 00044478: 24670001 addiu r7,r3,0x0001 #r7 = byte + 1 0004447c: 24840001 addiu r4,r4,0x0001 #r4 + 1 00044480: 2c820040 sltiu r2,r4,0x0040 #set true if r4 < 0x40 00044484: 1440ffeb bne r2,r0,0x00044434 #loop if untrue 00044488: 00a6102b sltu r2,r5,r6 #set true if r5 < Ceil(input>>0xb) 0004448c: 14400010 bne r2,r0,0x000444d0 #branch if so 00044490: 00001021 addu r2,r0,r0 #r2 = 0 00044494: 10a0000a beq r5,r0,0x000444c0 #branch if r5 = 0 00044498: 00002021 addu r4,r0,r0 #r4 = 0 0004449c: 3c038005 lui r3,0x8005 000444a0: 2463e9d4 addiu r3,r3,-0x162c #r3 = 0x8004e9d4 000444a4: 01041021 addu r2,r8,r4 #r2 = r8 + r4 000444a8: 00431021 addu r2,r2,r3 #r2 = 0x8004e9d4 + r8 + r4 000444ac: a0470000 sb r7,0x0000(r2) #save r7 000444b0: 24840001 addiu r4,r4,0x0001 #r4 + 1 000444b4: 0085102b sltu r2,r4,r5 #set true if r5 counter < r4 counter 000444b8: 1440fffa bne r2,r0,0x000444a4 #loop above until r4 => r5 (?) 000444bc: 00000000 nop 000444c0: 3c038001 lui r3,0x8001 000444c4: 8c630010 lw r3,0x0010(r3) #loads either a very large number, or a stack pointer. (0x801df000?) 000444c8: 000812c0 sll r2,r8,0x0b #r2 = r8 << 0xb 000444cc: 00431021 addu r2,r2,r3 #r2 + 801df000? 000444d0: 27bd0008 addiu r29,r29,0x0008 000444d4: 03e00008 jr r31 000444d8: 00000000 nop
