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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package linux
import (
"fmt"
"golang.org/x/sys/unix"
)
// Protections for mmap(2).
const (
PROT_NONE = 0
PROT_READ = 1 << 0
PROT_WRITE = 1 << 1
PROT_EXEC = 1 << 2
PROT_SEM = 1 << 3
PROT_GROWSDOWN = 1 << 24
PROT_GROWSUP = 1 << 25
)
// Flags for mmap(2).
const (
MAP_SHARED = 1 << 0
MAP_PRIVATE = 1 << 1
MAP_FIXED = 1 << 4
MAP_ANONYMOUS = 1 << 5
MAP_32BIT = 1 << 6 // arch/x86/include/uapi/asm/mman.h
MAP_GROWSDOWN = 1 << 8
MAP_DENYWRITE = 1 << 11
MAP_EXECUTABLE = 1 << 12
MAP_LOCKED = 1 << 13
MAP_NORESERVE = 1 << 14
MAP_POPULATE = 1 << 15
MAP_NONBLOCK = 1 << 16
MAP_STACK = 1 << 17
MAP_HUGETLB = 1 << 18
)
// Flags for mremap(2).
const (
MREMAP_MAYMOVE = 1 << 0
MREMAP_FIXED = 1 << 1
)
// Flags for mlock2(2).
const (
MLOCK_ONFAULT = 0x01
)
// Flags for mlockall(2).
const (
MCL_CURRENT = 1
MCL_FUTURE = 2
MCL_ONFAULT = 4
)
// Advice for madvise(2).
const (
MADV_NORMAL = 0
MADV_RANDOM = 1
MADV_SEQUENTIAL = 2
MADV_WILLNEED = 3
MADV_DONTNEED = 4
MADV_REMOVE = 9
MADV_DONTFORK = 10
MADV_DOFORK = 11
MADV_MERGEABLE = 12
MADV_UNMERGEABLE = 13
MADV_HUGEPAGE = 14
MADV_NOHUGEPAGE = 15
MADV_DONTDUMP = 16
MADV_DODUMP = 17
MADV_HWPOISON = 100
MADV_SOFT_OFFLINE = 101
MADV_NOMAJFAULT = 200
MADV_DONTCHGME = 201
)
// Flags for msync(2).
const (
MS_ASYNC = 1 << 0
MS_INVALIDATE = 1 << 1
MS_SYNC = 1 << 2
)
// NumaPolicy is the NUMA memory policy for a memory range. See numa(7).
//
// +marshal
type NumaPolicy int32
// Policies for get_mempolicy(2)/set_mempolicy(2).
const (
MPOL_DEFAULT NumaPolicy = 0
MPOL_PREFERRED NumaPolicy = 1
MPOL_BIND NumaPolicy = 2
MPOL_INTERLEAVE NumaPolicy = 3
MPOL_LOCAL NumaPolicy = 4
MPOL_MAX NumaPolicy = 5
)
// Flags for get_mempolicy(2).
const (
MPOL_F_NODE = 1 << 0
MPOL_F_ADDR = 1 << 1
MPOL_F_MEMS_ALLOWED = 1 << 2
)
// Flags for set_mempolicy(2).
const (
MPOL_F_RELATIVE_NODES = 1 << 14
MPOL_F_STATIC_NODES = 1 << 15
MPOL_MODE_FLAGS = (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES)
)
// Flags for mbind(2).
const (
MPOL_MF_STRICT = 1 << 0
MPOL_MF_MOVE = 1 << 1
MPOL_MF_MOVE_ALL = 1 << 2
MPOL_MF_VALID = MPOL_MF_STRICT | MPOL_MF_MOVE | MPOL_MF_MOVE_ALL
)
// TaskSize is the address space size.
var TaskSize = func() uintptr {
pageSize := uintptr(unix.Getpagesize())
for _, s := range feasibleTaskSizes {
// mmap returns ENOMEM if addr is greater than TASK_SIZE,
// otherwise it returns EINVAL, because addr isn't aligned to
// the page size.
_, _, errno := unix.RawSyscall6(
unix.SYS_MMAP,
s-pageSize-1,
512,
uintptr(unix.PROT_NONE),
uintptr(unix.MAP_ANONYMOUS|unix.MAP_PRIVATE|unix.MAP_FIXED), 0, 0)
if errno == unix.EINVAL {
return s
}
if errno != unix.ENOMEM {
panic(fmt.Sprintf("mmap returned unexpected error: %d", errno))
}
}
panic("None of the address space sizes could be successfully mmaped")
}()
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