1 .global vfork
2 .type vfork,@function
3 vfork:
4 	/* riscv does not have SYS_vfork, so we must use clone instead */
5 	/* note: riscv's clone = clone(flags, sp, ptidptr, tls, ctidptr) */
6 	li a7, 220
7 	li a0, 0x100 | 0x4000 | 17 /* flags = CLONE_VM | CLONE_VFORK | SIGCHLD */
8 	mv a1, sp
9 	/* the other arguments are ignoreable */
10 	ecall
11 	.hidden __syscall_ret
12 	j __syscall_ret
13