gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/platform/systrap/sysmsg/syshandler_arm64.S (about)

     1  // Copyright 2020 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  #include "sysmsg_offsets.h"
    16  
    17  .globl __export_syshandler;
    18  .type __export_syshandler, @function;
    19  .align 4, 0x00;
    20  // syshandler is not implemented for ARM64 yet.
    21  __export_syshandler:
    22    // BRK will generate an Debug Exception which cannot be masked.
    23    // See: https://developer.arm.com/documentation/102120/0100/Debug-exceptions
    24    // The immediate unsigned operand needs to be <= 0xffff.
    25    // See: https://developer.arm.com/documentation/dui0802/b/A64-General-Instructions/BRK
    26    BRK #0xdead
    27  
    28  .size __export_syshandler, . - __export_syshandler