| // Copyright (c) 2017 Baidu, Inc. All Rights Reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in |
| // the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Baidu, Inc., nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| use sgx_types::*; |
| |
| pub type exception_handle = * const c_void; |
| |
| /// |
| /// rsgx_register_exception_handler register an exception handler. |
| /// |
| /// rsgx_register_exception_handler allows developers to register an exception handler, and specify whether to prepend |
| /// (when is_first_handler is equal to 1) or append the handler to the handler chain. |
| /// |
| /// # Description |
| /// |
| /// The Intel(R) SGX SDK supports the registration of custom exception handler functions. You can write your own code to |
| /// handle a limited set of hardware exceptions. For example, a CPUID instruction inside an enclave will effectively result |
| /// in a #UD fault (Invalid Opcode Exception). ISV enclave code can have an exception handler to prevent the enclave from |
| /// being trapped into an exception condition. |
| /// |
| /// Calling rsgx_register_exception_handler allows you to register an exception handler, and specify whether to prepend |
| /// (when is_first_handler is nonzero) or append the handler to the handler chain. |
| /// |
| /// After calling rsgx_register_exception_handler to prepend an exception handler, a subsequent call to this function may |
| /// add another exception handler at the beginning of the handler chain. Therefore the order in which exception handlers |
| /// are called does not only depend on the value of the is_first_handler parameter, but more importantly depends on the order |
| /// in which exception handlers are registered. |
| /// |
| /// # Parameters |
| /// |
| /// **is_first_handler** |
| /// |
| /// Specify the order in which the handler should be called. If the parameter is nonzero, the handler is the first handler |
| /// to be called. If the parameter is zero, the handler is the last handler to be called. |
| /// |
| /// **exception_handler** |
| /// |
| /// The exception handler to be called |
| /// |
| /// # Requirements |
| /// |
| /// Library: libsgx_trts.a |
| /// |
| /// # Return value |
| /// |
| /// **Some(exception_handle)** |
| /// |
| /// Indicates the exception handler is registered successfully. The return value is an open handle to the custom exception handler. |
| /// |
| /// **None** |
| /// |
| /// The exception handler was not registered. |
| /// |
| pub fn rsgx_register_exception_handler(is_first_handler: u32, exception_handler: sgx_exception_handler_t) -> Option<exception_handle> { |
| |
| let handle = unsafe { |
| sgx_register_exception_handler(is_first_handler, exception_handler) |
| }; |
| |
| if handle.is_null() { None } else { Some(handle) } |
| } |
| |
| /// |
| /// rsgx_unregister_exception_handler is used to unregister a custom exception handler. |
| /// |
| /// # Description |
| /// |
| /// The Intel(R) SGX SDK supports the registration of custom exception handler functions. An enclave developer |
| /// can write their own code to handle a limited set of hardware exceptions. |
| /// |
| /// Calling rsgx_unregister_exception_handler allows developers to unregister an exception handler that was registered earlier. |
| /// |
| /// # Parameters |
| /// |
| /// **handle** |
| /// |
| /// A handle to the custom exception handler previously registered using the rsgx_register_exception_handler function. |
| /// |
| /// # Requirements |
| /// |
| /// Library: libsgx_trts.a |
| /// |
| /// # Return value |
| /// |
| /// **true** |
| /// |
| /// The custom exception handler is unregistered successfully. |
| /// |
| /// **false** |
| /// |
| /// The exception handler was not unregistered (not a valid pointer, handler not found). |
| /// |
| pub fn rsgx_unregister_exception_handler(handle: exception_handle) -> bool { |
| |
| let ret = unsafe { sgx_unregister_exception_handler(handle) }; |
| if ret == 0 { false } else { true } |
| } |