Whis is this x86_64 AT&T assembly failing, i think foo: is the culprit?

Question

Here is the assembly, I am using Windows 11.

Assembling: as .\test.S -o test.out Linking: ld -o test.exe -subsys=console test.out -L "C:\TDM-GCC-64\x86_64-w64-mingw32\lib" -lmsvcrt When i run the program a garbage exit code is thrown... I think the foo function is the culprit.

Even when i remove call foo, it gives random exit code.

    ;#; This file was generated by the MZ compiler.
    .section .data
b:  .space  8
a:  .space  8
    .section .text
foo:
    push    %rbp
    mov     %rsp,       %rbp
    sub     $32,        %rsp
    add     $32,        %rsp
    pop     %rbp
    ret     

    .global _start
_start:
    push    %rbp
    mov     %rsp,       %rbp
    sub     $32,        %rsp
    lea     a(%rip),    %rax
    movq    $420,       (%rax)
    lea     b(%rip),    %rax
    movq    $42,        (%rax)
    mov     $10,        %rcx
    mov     $3,         %rdx
    call    foo
    add     $32,        %rsp
    pop     %rbp
    movq    $0,         %rax
    ret