SimpleAssembler aka SASM in Ubuntu and Windows

build-exec.cmd

C:/apps/simple-asm/GAS/64/as.exe pclinwin.s -o program.o --64

C:/apps/simple-asm/MinGW64/bin/gcc.exe program.o -g -o program.exe -m64

pclinwin.s

## SASM mode: GAS x64

.file   "pclinwin.s"

### gcc -no-pie -z noexecstack windows.s (Ubuntu)
### arkenidar@PC-HP-3:~/Dropbox/gh-repos/_drafts/asm$ gcc -no-pie -z noexecstack windows.s && ./a.out
# gcc -no-pie asm--program-01--GAS-X64-Assembly--SASM.s && ./a.* # example compilation (Ubuntu)

### -z noexecstack
# missing .note.GNU-stack section implies executable stack
###.section .note.GNU-stack,"",@progbits # added after above warning message (for Ubuntu, not Windows)
# un-comment in Linux , comment in Windows (... the line above)

# gcc -no-pie -z noexecstack pclinwin.s && ./a.out # in Ubuntu GNU+Linux

.data

count: .quad 0

# asciz means zero-terminated ASCII character-string
format_string: .asciz "Hello, world! [[%lld]]\n"
# no new-line (\n) for puts()
string01: .asciz "01: puts test"
string02: .asciz "02: puts test"
string_empty: .asciz ""

input_int_1: .quad 0
input_int_2: .quad 0
input_format_int_sum: .asciz "%lld%lld"
output_int_sum: .quad 0
output_format_int_sum: .asciz "output of integer sum: %lld \n \n"

.extern printf
.extern puts
.extern scanf

.text

.global main # program entry-point (beginning)
main:
    movq %rsp, %rbp #for correct debugging
    mov %rsp, %rbp # for correct debugging
     sub $32, %rsp # only in SOME CASES (in Windows, not Ubuntu)
    and $-16, %rsp # for correct debugging

    # write your code here
    
    # scanf : read 1 and 2
    mov $input_format_int_sum, %rcx
    mov $input_int_1, %rdx
    mov $input_int_2, %r8
    call scanf
    
    # add : sum 1 and 2
    movq input_int_1, %r13
    addq input_int_2, %r13
    mov %r13, output_int_sum
    
    # printf : write sum
    mov $output_format_int_sum, %rcx
    mov output_int_sum, %rdx
    call printf
    
    # begin
    
    movq $1, count # can be e.g. $3 (at least 1 as "do-while" construct)
    
    loop_begin:
    
    ## https://en.wikipedia.org/wiki/X86_calling_conventions
    # %rdi,%rsi,%rdx,%rcx,... (Ubuntu) or %rcx,%rdx,%r8,%r9,... (Windows)
    
    # OS: windows (comment/un-comment)
    #*
    
    mov $format_string, %rcx
    mov count, %rdx
    call printf
    
    mov $string01, %rcx
    call puts

    mov $string02, %rcx
    call puts
    
    mov $string_empty, %rcx
    call puts
    
    #*/
    
    # OS: debian/ubuntu (comment/un-comment)
    /*
    
    mov $format_string, %rdi
    mov count, %rsi
    call printf
    
    mov $string01, %rdi
    call puts

    mov $string02, %rdi
    call puts
    
    mov $string_empty, %rdi
    call puts
    
    #*/

    # back-up
    /*
    
    mov $format_string, %rcx
    mov count, %rdx
    call printf
    
    mov $string01, %rcx
    call puts

    mov $string02, %rcx
    call puts
    
    mov $string_empty, %rcx
    call puts
    
    #*/
        
    # loop check
    
    decq count
    cmpq $0,count
    jne loop_begin
    
    # end
    
    mov %rbp, %rsp # for correct debugging
    
    mov $0, %rax # main returns 0
    ret