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