1 // justsyms_1.cc -- test --just-symbols for gold 2 3 // Copyright (C) 2008-2016 Free Software Foundation, Inc. 4 // Written by Ian Lance Taylor <iant (at) google.com>. 5 6 // This file is part of gold. 7 8 // This program is free software; you can redistribute it and/or modify 9 // it under the terms of the GNU General Public License as published by 10 // the Free Software Foundation; either version 3 of the License, or 11 // (at your option) any later version. 12 13 // This program is distributed in the hope that it will be useful, 14 // but WITHOUT ANY WARRANTY; without even the implied warranty of 15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 // GNU General Public License for more details. 17 18 // You should have received a copy of the GNU General Public License 19 // along with this program; if not, write to the Free Software 20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 // MA 02110-1301, USA. 22 23 // The Linux kernel builds an object file using a linker script, and 24 // then links against that object file using the -R option. This is a 25 // test for that usage. 26 27 #include <cassert> 28 #include <csignal> 29 #include <cstddef> 30 #include <cstdlib> 31 #include <stdint.h> 32 33 extern char justsyms_string[]; 34 35 // We expect to get a SIGSEGV. 36 static void 37 handle_sigsegv(int) 38 { 39 exit(0); 40 } 41 42 int 43 main(int, char**) 44 { 45 // The linker script should arrange for this symbol to be exactly at 46 // address 0x10000. 47 assert(reinterpret_cast<uintptr_t>(justsyms_string) == 0x100); 48 49 // However, since the file was linked with --just-symbols, we should 50 // not be able to actually access the symbol. 51 signal(SIGSEGV, handle_sigsegv); 52 char c = justsyms_string[0]; 53 exit(c == '\0' ? 1 : c); 54 } 55
