Create learn asm repo

Repository for learning assembly language

info

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+
+https://asmtutor.com/
+
+https://www.chromium.org/chromium-os/developer-library/reference/linux-constants/syscalls/#x86-32-bit

lesson1/l1.asm

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+; Lesson 1
+; nasm -f elf l1.asm
+; ld -m elf_i386 l1.o -o l1
+
+SECTION .data
+msg     db      'Hello, World!', 0Ah
+
+SECTION .text
+global  _start
+
+_start:
+mov     edx, 13
+mov     ecx, msg
+mov     ebx, 1
+mov     eax, 4
+int     80h

lesson2/l2.asm

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+
+SECTION .data
+msg     db      'cat!', 0Ah
+
+SECTION .text
+global  _start
+
+_start:
+mov     edx, 5
+mov     ecx, msg
+mov     ebx, 1
+mov     eax, 4
+int     80h
+
+mov     ebx, 0
+mov     eax, 1
+int     80h

lesson3/l3.asm

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+
+SECTION .data
+msg     db      'Le Chat!', 0Ah
+
+SECTION .text
+global  _start
+
+_start:
+mov     ebx, msg
+mov     eax, ebx
+
+nextchar:
+cmp     byte [eax], 0
+jz      finished
+inc     eax
+jmp     nextchar
+
+finished:
+sub     eax, ebx
+mov     edx, eax
+mov     ecx, msg
+mov     ebx, 1
+mov     eax, 4
+int     80h
+
+mov     ebx, 0
+mov     eax, 1
+int     80h

lesson3/l3i.asm

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+
+SECTION .data
+msg     db      'Le Chat!', 0Ah
+
+SECTION .text
+global  _start
+
+_start:
+mov     ecx, msg
+mov     edx, ecx
+
+nextchar:
+cmp     byte [edx], 0
+jz      finished
+inc     edx
+jmp     nextchar
+
+finished:
+sub     edx, ecx
+mov     ebx, 1
+mov     eax, 4
+int     80h
+
+mov     ebx, 0
+mov     eax, 1
+int     80h

lesson4/l4.asm

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+
+SECTION .data
+msg     db      'A cat!', 0Ah
+
+SECTION .text
+global  _start
+
+_start:
+mov     edx, msg
+call    strlen
+
+mov     ecx, msg
+mov     ebx, 1
+mov     eax, 4
+int     80h
+
+mov     ebx, 0
+mov     eax, 1
+int     80h
+
+strlen:
+push    ebx
+mov     ebx, edx
+
+nextchar:
+cmp     byte [edx], 0
+jz      finished
+inc     edx
+jmp     nextchar
+
+finished:
+sub     edx, ebx
+pop     ebx
+ret

lesson5/l5.asm

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+
+%include '../lib/fl.asm'
+
+SECTION .data
+msg1    db  'Cats and', 0Ah
+msg2    db  'Dogs', 0Ah
+
+SECTION .text
+global  _start
+
+_start:
+mov     eax, msg1
+call    sprint
+
+mov     eax, msg2
+call    sprint
+
+call    quit

lib/fl.asm

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+
+slen:
+push    ebx
+mov     ebx, eax
+
+nextchar:
+cmp     byte [eax], 0
+jz      finished
+inc     eax
+jmp     nextchar
+
+finished:
+sub     eax, ebx
+pop     ebx
+ret
+
+
+
+sprint:
+push    edx
+push    ecx
+push    ebx
+push    eax
+call    slen
+
+mov     edx, eax
+pop     eax
+
+mov     ecx, eax
+mov     ebx, 1
+mov     eax, 4
+int     80h
+
+pop     ebx
+pop     ecx
+pop     edx
+ret
+
+
+
+quit:
+mov     ebx, 0
+mov     eax, 1
+int     80h
+ret