2c4ae3b0a4
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build arm64
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// +build arm64
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package hostarch
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import (
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"encoding/binary"
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"golang.org/x/sys/unix"
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)
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const (
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// PageSize is the system page size.
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// arm64 support 4K/16K/64K page size,
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// which can be get by unix.Getpagesize().
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// Currently, only 4K page size is supported.
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PageSize = 1 << PageShift
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// HugePageSize is the system huge page size.
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HugePageSize = 1 << HugePageShift
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// CacheLineSize is the size of the cache line.
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CacheLineSize = 1 << CacheLineShift
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// PageShift is the binary log of the system page size.
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PageShift = 12
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// HugePageShift is the binary log of the system huge page size.
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// Should be calculated by "PageShift + (PageShift - 3)"
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// when multiple page size support is ready.
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HugePageShift = 21
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// CacheLineShift is the binary log of the cache line size.
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CacheLineShift = 6
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)
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// ByteOrder is the native byte order (little endian).
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var ByteOrder = binary.LittleEndian
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// Arm64: Exception Syndrome Register EL1.
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const (
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_ESR_ELx_EC_SHIFT = 26
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_ESR_ELx_EC_MASK = 0x3F << _ESR_ELx_EC_SHIFT
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_ESR_ELx_EC_IABT_LOW = 0x20
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_ESR_ELx_EC_DABT_LOW = 0x24
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_ESR_ELx_WNR = 1 << 6
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_ESR_ELx_CM = 1 << 8
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)
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// ESRAccessType returns the memory access type for the given ESR (Exception
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// Syndrome Register) code. If code does not represent an invalid memory
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// access from a lower exception level, ESRAccessType returns NoAccess.
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//
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//go:nosplit
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func ESRAccessType(code uint64) AccessType {
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switch (code & _ESR_ELx_EC_MASK) >> _ESR_ELx_EC_SHIFT {
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case _ESR_ELx_EC_IABT_LOW:
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return Execute
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case _ESR_ELx_EC_DABT_LOW:
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// For faults on cache maintenance and address translation
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// instructions, _ESR_ELx_WNR is always set.
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if code&(_ESR_ELx_WNR|_ESR_ELx_CM) == _ESR_ELx_WNR {
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return Write
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}
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return Read
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default:
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return NoAccess
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}
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}
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// UntaggedUserAddr clears the tag from the address pointer. Top-Byte-Ignore (TBI0)
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// is enabled in Linux, so bits[63:56] of user space addresses are ignored.
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func UntaggedUserAddr(addr Addr) Addr {
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return Addr(int64(addr<<8) >> 8)
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}
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func init() {
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// Make sure the page size is 4K on arm64 platform.
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if size := unix.Getpagesize(); size != PageSize {
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panic("Only 4K page size is supported on arm64!")
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}
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}
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