Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/osvegn/asm_mini_libc

Last synced: about 1 month ago
JSON representation

Host: GitHub
URL: https://github.com/osvegn/asm_mini_libc
Owner: osvegn
Created: 2023-12-04T02:53:49.000Z (12 months ago)
Default Branch: main
Last Pushed: 2023-12-04T23:49:15.000Z (12 months ago)
Last Synced: 2023-12-05T00:36:07.413Z (12 months ago)
Language: Assembly
Size: 465 KB
Stars: 0
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md

Awesome Lists containing this project

README

        # Assembly mini libc

## Objectives

- Learn assembly language

- Create basic libc functions in assembly

## Functions to create

- [x] strlen

- [x] strchr

- [x] memset

- [x] memcpy

- [x] strcmp

- [x] memmove

- [x] strncmp

- [ ] strcasecmp

- [x] rindex

- [x] strstr

- [ ] strpbrk

- [ ] strcspn

## Documentation

### Registers

| 64-bit | 32-bit | 16-bit | 8-bit | USAGE |

|--------|--------|--------|-------|-------|

| RAX    | EAX    | AX     | AH-AL | return value 

| RBX    | EBX    | BX     | BH-BL |

| RCX    | ECX    | CX     | CH-CL | arg4

| RDX    | EDX    | DX     | DH-DL | arg3

| RSI    | ESI    | SI     | SIL   | arg2

| RDI    | EDI    | DI     | DIL   | arg1

| RBP    | EBP    | BP     | BPL   |

| RSP    | ESP    | SP     | SPL   | stack pointer

| R8     | R8D    | R8W    | R8B   | arg5

| R9     | R9D    | R9W    | R9B   | arg6

| R10    | R10D   | R10W   | R10B  |

| R11    | R11D   | R11W   | R11B  |

| R12    | R12D   | R12W   | R12B  |

| R13    | R13D   | R13W   | R13B  |

| R14    | R14D   | R14W   | R14B  |

| R15    | R15D   | R15W   | R15B  |

### Instructions

#### Data movement

- mov DEST, SRC

  move SRC to DEST

#### Condition

- cmp ELEM1, ELEM2

  compare ELEM1 to ELEM2. Use a jmp condition to compare the result.

#### Arithmetic

- inc VAR

  increment variable by 1