1#__clone(func, stack, flags, arg, ptid, tls, ctid)
 2#         a0,    a1,   a2,    a3,  a4,  a5,   a6
 3# sys_clone(flags, stack, ptid, ctid, tls)
 4#            a0,    a1,   a2,    a3,  a4
 5
 6.global __clone
 7.hidden __clone
 8.type __clone,@function
 9__clone:
10	bstrins.d $a1, $zero, 3, 0   #stack to 16 align
11	# Save function pointer and argument pointer on new thread stack
12	addi.d  $a1, $a1, -16
13	st.d    $a0, $a1, 0     # save function pointer
14	st.d    $a3, $a1, 8     # save argument pointer
15	or      $a0, $a2, $zero
16	or      $a2, $a4, $zero
17	or      $a3, $a6, $zero
18	or      $a4, $a5, $zero
19	ori     $a7, $zero, 220
20	syscall 0               # call clone
21
22	beqz    $a0, 1f         # whether child process
23	jirl    $zero, $ra, 0   # parent process return
241:
25	move    $fp, $zero
26	ld.d    $t8, $sp, 0     # function pointer
27	ld.d    $a0, $sp, 8     # argument pointer
28	jirl    $ra, $t8, 0     # call the user's function
29	ori     $a7, $zero, 93
30	syscall 0               # child process exit