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69 lines
2.4 KiB
69 lines
2.4 KiB
/* BEGIN_LEGAL
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Copyright (c) 2021 Intel Corporation
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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END_LEGAL */
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/// @file xed-min.c
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/// @brief a minimal toy example of using the decoder.
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#include "xed/xed-interface.h"
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#include <stdio.h>
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int main(int argc, char** argv);
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int main(int argc, char** argv) {
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xed_machine_mode_enum_t mmode;
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xed_address_width_enum_t stack_addr_width;
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xed_bool_t long_mode = 0;
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// create the decoded instruction, and fill in the machine mode (dstate)
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// make up a simple 2Byte instruction to decode
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unsigned int bytes = 0;
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unsigned char itext[15] = { 0xf, 0x85, 0x99, 0x00, 0x00, 0x00 };
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// initialize the XED tables -- one time.
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xed_tables_init();
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// The state of the machine -- required for decoding
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if (long_mode) {
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mmode=XED_MACHINE_MODE_LONG_64;
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stack_addr_width = XED_ADDRESS_WIDTH_64b;
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}
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else {
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mmode=XED_MACHINE_MODE_LEGACY_32;
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stack_addr_width = XED_ADDRESS_WIDTH_32b;
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}
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// This is a test of error handling. I vary the instuction length from
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// 0 bytes to 15 bytes. Normally, you should send in 15 bytes of itext
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// unless you are near the end of a page and don't want to take a page
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// fault or tlb miss. Note, you have to reinitialize the xedd each time
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// you try to decode in to it.
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// Try different instruction lengths to see when XED recognizes an
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// instruction as valid.
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for(bytes = 0;bytes<=15;bytes++) {
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xed_error_enum_t xed_error;
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xed_decoded_inst_t xedd;
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xed_decoded_inst_zero(&xedd);
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xed_decoded_inst_set_mode(&xedd, mmode, stack_addr_width);
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xed_error = xed_decode(&xedd,
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XED_STATIC_CAST(const xed_uint8_t*,itext),
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bytes);
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printf("%d %s\n",(int)bytes, xed_error_enum_t2str(xed_error));
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}
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return 0;
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(void) argc; (void) argv; //pacify compiler
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}
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