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/*
* arch/arm64/vfork.S
*
* vfork - a system call which must not use the stack.
*/
#include <asm/unistd.h>
.type vfork,#function
.globl vfork
.balign 8
vfork:
/* Prepare for the system call */
/* 1. Push the function pointer and argument location
on to the child process stack */
/* 2. Gather the Flags */
/* New sp is already in x1. */
mov x0, #0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
mov x1, sp
mov w8,__NR_clone
svc 0
cmp x0, #0x0
b.ge 2f
neg x0, x0
ldr x8, 1f
str x0, [x8]
mov x0, #-1
2:
ret
1:
.dword errno
.size vfork,.-vfork
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