created some basic string helper functions
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.gitignore
vendored
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.gitignore
vendored
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.asm-lsp.toml
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build
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16
src/main.asm
16
src/main.asm
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SYS_EXIT equ 60
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SYS_IOCTL equ 16
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STDOUT equ 1
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TIOCGWINSZ equ 0x5413
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section .bss
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str_buf: resb 4
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section .data
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section .text
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global _start
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extern print_str
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extern unsigned_int_to_ascii
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_start:
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40
src/str.asm
40
src/str.asm
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SYS_WRITE equ 1
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STDOUT equ 1
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ASCII_ZERO equ 48
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section .text
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global print_str
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print_str: ; takes pointer to string in rdi and retuns in rax
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push rsi
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push rdx
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@ -22,3 +25,40 @@ print_str: ; takes pointer to string in rdi and retuns in rax
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pop rsi
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ret
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global unsigned_int_to_ascii
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unsigned_int_to_ascii: ; takes pointer to array in rdi and value stored in rsi DOES NOT BOUNDS CHECK
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mov r11, 0
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mov rcx, 10
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mov rax, rsi
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.count_loop:
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inc r11
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cmp rax, 10
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jl .loop_count_exit
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xor rdx, rdx
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div rcx
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push rdx
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jmp .count_loop
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.loop_count_exit:
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push rax
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mov rcx, 0
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.store_loop: ; basicly for loop
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cmp rcx, r11
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jnl .loop_store_exit
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pop rax
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add rax, ASCII_ZERO
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mov byte [rdi + rcx], al
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inc rcx
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jmp .store_loop
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.loop_store_exit:
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mov rax, r11
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ret
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