github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/rseq/uapi.h (about)

     1  // Copyright 2019 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #ifndef GVISOR_TEST_SYSCALLS_LINUX_RSEQ_UAPI_H_
    16  #define GVISOR_TEST_SYSCALLS_LINUX_RSEQ_UAPI_H_
    17  
    18  #include <stdint.h>
    19  
    20  // User-kernel ABI for restartable sequences.
    21  
    22  // Syscall numbers.
    23  #if defined(__x86_64__)
    24  constexpr int kRseqSyscall = 334;
    25  #elif defined(__aarch64__)
    26  constexpr int kRseqSyscall = 293;
    27  #else
    28  #error "Unknown architecture"
    29  #endif  // __x86_64__
    30  
    31  struct rseq_cs {
    32    uint32_t version;
    33    uint32_t flags;
    34    uint64_t start_ip;
    35    uint64_t post_commit_offset;
    36    uint64_t abort_ip;
    37  } __attribute__((aligned(4 * sizeof(uint64_t))));
    38  
    39  // N.B. alignment is enforced by the kernel.
    40  struct rseq {
    41    uint32_t cpu_id_start;
    42    uint32_t cpu_id;
    43    struct rseq_cs* rseq_cs;
    44    uint32_t flags;
    45  } __attribute__((aligned(4 * sizeof(uint64_t))));
    46  
    47  constexpr int kRseqFlagUnregister = 1 << 0;
    48  
    49  constexpr int kRseqCPUIDUninitialized = -1;
    50  
    51  #endif  // GVISOR_TEST_SYSCALLS_LINUX_RSEQ_UAPI_H_