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; Copyright (c) 2023 Marvin Borner
global main
extern printf
extern array
extern size
bits 64
;;; main
main:
push rbp
mov ecx, size
loop:
push rcx
call thread
pop rcx
dec ecx
jnz loop
end:
call thread_wait_all
pop rbp
mov rax, 0x3c
mov rdi, 0
syscall ; exit
; this works sometimes (if numbers are good)
; uses busy loop
coolsleep:
mov rax, 0x4242424
mov rcx, rsi
mul rcx
.loop:
dec rax
jnz .loop
ret
; this works on most normal CPUs (if numbers are good)
; uses nanosleep syscall
boringsleep:
mov rax, 0x424242
mov rcx, rsi
mul rcx
push qword rax ; ns
push qword 0 ; s
mov rax, 0x23
mov rdi, rsp
xor rsi, rsi
syscall
add rsp, 16
ret
print:
push rsi
call boringsleep ; or coolsleep
pop rsi
mov rdi, format
xor rax, rax
call printf
ret
thread:
lea rax, print
mov esi, [array + (ecx - 1) * 4]
call thread_run
ret
;;; utils
thread_run:
push rax
mov rax, 0x39
syscall ; fork
cmp rax, 0
mov r10, rax
pop rax
je child
mov rax, r10
ret
thread_wait_all:
sub rsp, 4
mov rdi, -1
mov rax, 0x3d
mov rsi, rsp
xor rdx, rdx
xor r10, r10
syscall ; wait4
add rsp, 4
cmp rax, -10 ; idk why
jne thread_wait_all
ret
child:
call rax
mov rax, 0x3c
mov rdi, 0
syscall ; exit
;;; data
section .data
format: db "%d", 10, 0
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