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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* Copyright (C) 2009-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include JIT_READER_H /* Please see jit-reader.exp for an explanation. */
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#include "jithost.h"
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#include "jit-protocol.h"
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void __attribute__((noinline)) __jit_debug_register_code () { }
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struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
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struct jit_code_entry only_entry;
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typedef void (jit_function_t) ();
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/* The code of the jit_function_00 function that is copied into an
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mmapped buffer in the inferior at run time.
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The second instruction mangles the stack pointer, meaning that when
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stopped at the third instruction, GDB needs assistance from the JIT
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unwinder in order to be able to unwind successfully. */
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const unsigned char jit_function_00_code[] = {
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0xcc, /* int3 */
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0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */
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0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */
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0xc3 /* ret */
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};
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int
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main (int argc, char **argv)
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{
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struct jithost_abi *symfile;
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char *code = mmap (NULL, getpagesize (), PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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jit_function_t *function = (jit_function_t *) code;
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memcpy (code, jit_function_00_code, sizeof (jit_function_00_code));
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symfile = malloc (sizeof (struct jithost_abi));
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symfile->begin = code;
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symfile->end = code + sizeof (jit_function_00_code);
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only_entry.symfile_addr = symfile;
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only_entry.symfile_size = sizeof (struct jithost_abi);
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__jit_debug_descriptor.first_entry = &only_entry;
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__jit_debug_descriptor.relevant_entry = &only_entry;
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__jit_debug_descriptor.action_flag = JIT_REGISTER;
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__jit_debug_descriptor.version = 1;
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__jit_debug_register_code ();
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function ();
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return 0;
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}
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