Add kern_mincore() helper for micore() syscall.

Suggested by:	kib@
Reviewed by:	kib@
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D10143
This commit is contained in:
Dmitry Chagin 2017-03-30 19:42:49 +00:00
parent cb83812c70
commit 46dc8e9d6a
2 changed files with 10 additions and 8 deletions

View File

@ -152,6 +152,7 @@ int kern_lseek(struct thread *td, int fd, off_t offset, int whence);
int kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg,
struct timeval *tptr, enum uio_seg tptrseg);
int kern_madvise(struct thread *td, uintptr_t addr, size_t len, int behav);
int kern_mincore(struct thread *td, uintptr_t addr, size_t len, char *vec);
int kern_mkdirat(struct thread *td, int fd, char *path,
enum uio_seg segflg, int mode);
int kern_mkfifoat(struct thread *td, int fd, char *path,

View File

@ -710,12 +710,18 @@ struct mincore_args {
int
sys_mincore(struct thread *td, struct mincore_args *uap)
{
return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec));
}
int
kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec)
{
vm_offset_t addr, first_addr;
vm_offset_t end, cend;
pmap_t pmap;
vm_map_t map;
char *vec;
int error = 0;
int vecindex, lastvecindex;
vm_map_entry_t current;
@ -732,17 +738,12 @@ sys_mincore(struct thread *td, struct mincore_args *uap)
* Make sure that the addresses presented are valid for user
* mode.
*/
first_addr = addr = trunc_page((vm_offset_t) uap->addr);
end = addr + (vm_size_t)round_page(uap->len);
first_addr = addr = trunc_page(addr0);
end = addr + (vm_size_t)round_page(len);
map = &td->td_proc->p_vmspace->vm_map;
if (end > vm_map_max(map) || end < addr)
return (ENOMEM);
/*
* Address of byte vector
*/
vec = uap->vec;
pmap = vmspace_pmap(td->td_proc->p_vmspace);
vm_map_lock_read(map);