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| #include <iostream> | |
| __attribute__ ((naked)) void asm_main() { | |
| __asm__ volatile (R"( | |
| // x19: Pointer to file | |
| // x20: xpos | |
| // x21: depth | |
| // x22: aim | |
| part1: |
wheremyfoodat
/ aoc2021_day1.cc
Last active
December 3, 2021 20:29
Day 1 of AOC 2021 in aarch64 assembly
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| #include <iostream> | |
| __attribute__ ((naked)) void asm_main() { | |
| __asm__ volatile (R"( | |
| // x19: Pointer to file | |
| // x20: Previous read number (or triplet for part 2) | |
| // x21: number of increments | |
| part1: | |
| stp x19, x30, [sp, -16]! // save return address and x19, lower stack |
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| void __noreturn sub_4003240() | |
| { | |
| int v0; // r2 | |
| int v1; // r0 | |
| int i; // r0 | |
| int v3; // r1 | |
| int v4; // r2 | |
| int v5; // r0 | |
| int v6; // r0 | |
| int v7; // r0 |
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| ; this is the caller function | |
| BIOSCODE:BFC06EC4 # =============== S U B R O U T I N E ======================================= | |
| BIOSCODE:BFC06EC4 | |
| BIOSCODE:BFC06EC4 | |
| BIOSCODE:BFC06EC4 sub_BFC06EC4: # CODE XREF: start+418↑j | |
| BIOSCODE:BFC06EC4 | |
| BIOSCODE:BFC06EC4 var_s0 = 0 | |
| BIOSCODE:BFC06EC4 | |
| BIOSCODE:BFC06EC4 addiu $sp, -0x18 | |
| BIOSCODE:BFC06EC8 sw $ra, 0x14+var_s0($sp) ; back up $ra in stack |
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| ; This is the code in Tetris which infinitely resets if you return 0 from the joypad register | |
| Evil: ; CODE XREF: sub_20C+E9↓j | |
| ROM:02C4 call pollJOYP ; stores inverted joypad state into 0xFF80 (upper nibble = dpad, low nibble = buttons) | |
| ROM:02C7 call sub_2F8 | |
| ROM:02CA call sub_7FF0 | |
| ROM:02CD ld a, [$FF80] ; read the joypad state that pollJOYP previously cached | |
| ROM:02CF and $F ; only keep the buttons, dump the dpad | |
| ROM:02D1 cp $F ; see if all buttons are pressed | |
| ROM:02D3 jp z, reset ; if yes reset lmfao |
wheremyfoodat
/ Game Boy Boot ROM Disassembly
Created
August 21, 2020 17:47
— forked from drhelius/Game Boy Boot ROM Disassembly
Game Boy Boot ROM Disassembly
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| LD SP,$fffe ; $0000 Setup Stack | |
| XOR A ; $0003 Zero the memory from $8000-$9FFF (VRAM) | |
| LD HL,$9fff ; $0004 | |
| Addr_0007: | |
| LD (HL-),A ; $0007 | |
| BIT 7,H ; $0008 | |
| JR NZ, Addr_0007 ; $000a | |
| LD HL,$ff26 ; $000c Setup Audio |
wheremyfoodat
/ Game Boy Boot ROM Disassembly
Created
August 21, 2020 17:47
— forked from drhelius/Game Boy Boot ROM Disassembly
Game Boy Boot ROM Disassembly
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| LD SP,$fffe ; $0000 Setup Stack | |
| XOR A ; $0003 Zero the memory from $8000-$9FFF (VRAM) | |
| LD HL,$9fff ; $0004 | |
| Addr_0007: | |
| LD (HL-),A ; $0007 | |
| BIT 7,H ; $0008 | |
| JR NZ, Addr_0007 ; $000a | |
| LD HL,$ff26 ; $000c Setup Audio |
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