1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// justsyms_1.cc -- test --just-symbols for gold
// Copyright (C) 2008-2016 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
// The Linux kernel builds an object file using a linker script, and
// then links against that object file using the -R option. This is a
// test for that usage.
#include <cassert>
#include <csignal>
#include <cstddef>
#include <cstdlib>
#include <stdint.h>
extern char justsyms_string[];
// We expect to get a SIGSEGV.
static void
handle_sigsegv(int)
{
exit(0);
}
int
main(int, char**)
{
// The linker script should arrange for this symbol to be exactly at
// address 0x10000.
assert(reinterpret_cast<uintptr_t>(justsyms_string) == 0x100);
// However, since the file was linked with --just-symbols, we should
// not be able to actually access the symbol.
signal(SIGSEGV, handle_sigsegv);
char c = justsyms_string[0];
exit(c == '\0' ? 1 : c);
}
|
GitWeb
