Fix double-free when creating more than one block in JIT debug info reader
[deliverable/binutils-gdb.git] / gdb / testsuite / gdb.base / jithost.c
... / ...
CommitLineData
1/* Copyright (C) 2009-2019 Free Software Foundation, Inc.
2
3 This file is part of GDB.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <string.h>
21#include <unistd.h>
22
23#include <sys/mman.h>
24
25#include JIT_READER_H /* Please see jit-reader.exp for an explanation. */
26#include "jithost.h"
27#include "jit-protocol.h"
28
29void __attribute__((noinline)) __jit_debug_register_code () { }
30
31struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 };
32struct jit_code_entry only_entry;
33
34typedef void (jit_function_stack_mangle_t) (void);
35typedef long (jit_function_add_t) (long a, long b);
36
37/* The code of the jit_function_00 function that is copied into an
38 mmapped buffer in the inferior at run time.
39
40 The second instruction mangles the stack pointer, meaning that when
41 stopped at the third instruction, GDB needs assistance from the JIT
42 unwinder in order to be able to unwind successfully. */
43static const unsigned char jit_function_stack_mangle_code[] = {
44 0xcc, /* int3 */
45 0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */
46 0x48, 0x83, 0xf4, 0xff, /* xor $0xffffffffffffffff, %rsp */
47 0xc3 /* ret */
48};
49
50/* And another "JIT-ed" function, with the prototype `jit_function_add_t`. */
51static const unsigned char jit_function_add_code[] = {
52 0x48, 0x01, 0xfe, /* add %rdi,%rsi */
53 0x48, 0x89, 0xf0, /* mov %rsi,%rax */
54 0xc3, /* retq */
55};
56
57int
58main (int argc, char **argv)
59{
60 struct jithost_abi *symfile = malloc (sizeof (struct jithost_abi));
61 char *code = mmap (NULL, getpagesize (), PROT_WRITE | PROT_EXEC,
62 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
63 char *code_end = code;
64
65 /* "JIT" function_stack_mangle. */
66 memcpy (code_end, jit_function_stack_mangle_code,
67 sizeof (jit_function_stack_mangle_code));
68 jit_function_stack_mangle_t *function_stack_mangle
69 = (jit_function_stack_mangle_t *) code_end;
70 symfile->function_stack_mangle.begin = code_end;
71 code_end += sizeof (jit_function_stack_mangle_code);
72 symfile->function_stack_mangle.end = code_end;
73
74 /* "JIT" function_add. */
75 memcpy (code_end, jit_function_add_code, sizeof (jit_function_add_code));
76 jit_function_add_t *function_add = (jit_function_add_t *) code_end;
77 symfile->function_add.begin = code_end;
78 code_end += sizeof (jit_function_add_code);
79 symfile->function_add.end = code_end;
80
81 /* Bounds of the whole object. */
82 symfile->object.begin = code;
83 symfile->object.end = code_end;
84
85 only_entry.symfile_addr = symfile;
86 only_entry.symfile_size = sizeof (struct jithost_abi);
87
88 __jit_debug_descriptor.first_entry = &only_entry;
89 __jit_debug_descriptor.relevant_entry = &only_entry;
90 __jit_debug_descriptor.action_flag = JIT_REGISTER;
91 __jit_debug_descriptor.version = 1;
92 __jit_debug_register_code ();
93
94 function_stack_mangle ();
95 function_add (5, 6);
96
97 return 0;
98}
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