1.global vfork 2.type vfork,@function 3vfork: 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