mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Jamie Liu
e0c2c50fd0
Userspace can mutate them, and this is consistent with Linux. PiperOrigin-RevId: 610902711
119 lines
3.4 KiB
C++
119 lines
3.4 KiB
C++
// 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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#ifndef GVISOR_TEST_SYSCALLS_LINUX_RSEQ_SYSCALLS_H_
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#define GVISOR_TEST_SYSCALLS_LINUX_RSEQ_SYSCALLS_H_
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#include "test/syscalls/linux/rseq/types.h"
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// Syscall numbers.
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#if defined(__x86_64__)
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constexpr int kExitGroup = 231;
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constexpr int kFutex = 202;
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constexpr int kGetpid = 39;
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constexpr int kMembarrier = 324;
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constexpr int kMmap = 9;
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#elif defined(__aarch64__)
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constexpr int kExitGroup = 94;
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constexpr int kFutex = 98;
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constexpr int kGetpid = 172;
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constexpr int kMembarrier = 283;
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constexpr int kMmap = 222;
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#else
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#error "Unknown architecture"
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#endif
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namespace gvisor {
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namespace testing {
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// Standalone system call interfaces.
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// Note that these are all "raw" system call interfaces which encode
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// errors by setting the return value to a small negative number.
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// Use sys_errno() to check system call return values for errors.
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// Maximum Linux error number.
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constexpr int kMaxErrno = 4095;
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// Errno values.
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#define EPERM 1
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#define EINTR 4
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#define EAGAIN 11
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#define EFAULT 14
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#define EBUSY 16
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#define EINVAL 22
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// Get the error number from a raw system call return value.
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// Returns a positive error number or 0 if there was no error.
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static inline int sys_errno(uintptr_t rval) {
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if (rval >= static_cast<uintptr_t>(-kMaxErrno)) {
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return -static_cast<int>(rval);
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}
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return 0;
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}
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extern "C" uintptr_t raw_syscall(int number, ...);
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extern "C" int clone(int (*fn)(void*), uintptr_t stack, int flags, void* arg,
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uint32_t* child_tid);
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// clone flags:
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#define CLONE_VM 0x00000100
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#define CLONE_FS 0x00000200
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#define CLONE_FILES 0x00000400
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#define CLONE_SIGHAND 0x00000800
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#define CLONE_THREAD 0x00010000
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#define CLONE_CHILD_CLEARTID 0x00200000
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#define CLONE_CHILD_SETTID 0x01000000
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static inline void sys_exit_group(int status) {
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raw_syscall(kExitGroup, status);
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}
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static inline uintptr_t sys_futex(uint32_t* uaddr, int futex_op, uint32_t val,
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const struct timespec* timeout) {
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return raw_syscall(kFutex, uaddr, futex_op, val, timeout);
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}
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// futex ops:
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#define FUTEX_WAIT 0
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static inline int sys_getpid() {
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return static_cast<int>(raw_syscall(kGetpid));
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}
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static inline uintptr_t sys_membarrier(int cmd, unsigned int flags) {
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return raw_syscall(kMembarrier, cmd, flags);
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}
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// membarrier commands:
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#define MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ (1 << 7)
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#define MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ (1 << 8)
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static inline uintptr_t sys_mmap(void* addr, size_t length, int prot, int flags,
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int fd, int64_t offset) {
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return raw_syscall(kMmap, addr, length, prot, flags, fd, offset);
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}
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// mmap options:
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#define PROT_READ 0x1
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#define PROT_WRITE 0x2
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#define MAP_PRIVATE 0x02
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#define MAP_ANONYMOUS 0x20
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#define MAP_STACK 0x020000
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} // namespace testing
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} // namespace gvisor
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#endif // GVISOR_TEST_SYSCALLS_LINUX_RSEQ_SYSCALLS_H_
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