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https://github.com/titi-rex/libasm
42 project libasm
https://github.com/titi-rex/libasm
42projects assembly
Last synced: 24 days ago
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42 project libasm
- Host: GitHub
- URL: https://github.com/titi-rex/libasm
- Owner: titi-rex
- Created: 2024-08-16T14:57:32.000Z (6 months ago)
- Default Branch: main
- Last Pushed: 2024-09-17T13:25:03.000Z (5 months ago)
- Last Synced: 2024-11-21T00:59:55.746Z (3 months ago)
- Topics: 42projects, assembly
- Language: Assembly
- Homepage:
- Size: 95.7 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Libasm
An introduction project to assembly
The goals is to rewrite somes functions in pure 64 bits ASM
# Requirements
- use Intel syntax
- 64 bits assembly
- use nasm as compiler
- no inline asm (do `.s` files)
- forbidden to use `-no-pie` compilation flag
- library must be called libasm.a
- a test main should be present
- check for error after syscall and set errno properly (use of `___error` or `errno_location`)
# Mandatory
Each functions should behave the same as their libc counterpart (see man 3 and man 2 for read/write)
Call to malloc authorized for strdup
```c
size_t ft_strlen(const char *s);
char * ft_strcpy(char *restrict dst, const char *restrict src);
int ft_strcmp(const char *s1, const char *s2);
char * ft_strdup(const char *s);
ssize_t ft_write(int fd, const void* buf, size_t count);
ssize_t ft_read(int fd, void* buf, size_t count);
```
# Bonus
Struct used for ft_list_* :
```c
typedef struct s_list
{
void *data;
struct s_list *next;
} t_list;
```
Theses functions should behave the same as the one from piscine (day04 and day12)
```c
int ft_atoi_base(char *str, char *base);
t_list *ft_create_elem(void *data);
void ft_list_push_front(t_list **begin_list, void *data);
int ft_list_size(t_list *begin_list);
void ft_list_sort(t_list **begin_list, int (*cmp)());
void ft_list_remove_if(t_list **begin_list, void *data_ref, int (*cmp)(), void (*free_fct)(void *));
```
## Tests
Insteed of a simple test main, tests are done using [LeadWasp](https://github.com/titi-rex/leadwasp_libasm_tester) which is not included in this repo
## References
- [Hello world in 64-bits ASM](https://p403n1x87.github.io/getting-started-with-x86-64-assembly-on-linux.html)
- [Good concrete introduction in 32-bits ASM + notions about stack](https://beta.hackndo.com/assembly-basics/)
- [Good asm introduction in 32-bits ASM (x86_32)](https://web.archive.org/web/20120822144129/http://www.cin.ufpe.br/%7Eif817/arquivos/asmtut/index.html)
- [Excellent short introduction on 64-bits ASM (x86_64)](https://aaronbloomfield.github.io/pdr/book/x86-64bit-asm-chapter.pdf)
- [Excellent explanation of the 'Calling Convention'](https://aaronbloomfield.github.io/pdr/book/x86-64bit-ccc-chapter.pdf)
- [Some history about registers names](https://www.crockford.com/x64.html)