1 2 /*--------------------------------------------------------------------*/ 3 /*--- Client-space code for the core. vg_preloaded.c ---*/ 4 /*--------------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2000-2010 Julian Seward 11 jseward (at) acm.org 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26 02111-1307, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 */ 30 31 32 /* --------------------------------------------------------------------- 33 ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU. 34 35 These functions are not called directly - they're the targets of code 36 redirection or load notifications (see pub_core_redir.h for info). 37 They're named weirdly so that the intercept code can find them when the 38 shared object is initially loaded. 39 40 Note that this filename has the "vg_" prefix because it can appear 41 in stack traces, and the "vg_" makes it a little clearer that it 42 originates from Valgrind. 43 ------------------------------------------------------------------ */ 44 45 #include "pub_core_basics.h" 46 #include "pub_core_clreq.h" 47 #include "pub_core_debuginfo.h" // Needed for pub_core_redir.h 48 #include "pub_core_redir.h" // For VG_NOTIFY_ON_LOAD 49 50 #if defined(VGO_linux) || defined(VGO_aix5) 51 52 /* --------------------------------------------------------------------- 53 Hook for running __libc_freeres once the program exits. 54 ------------------------------------------------------------------ */ 55 56 void VG_NOTIFY_ON_LOAD(freeres)( void ); 57 void VG_NOTIFY_ON_LOAD(freeres)( void ) 58 { 59 int res; 60 #if !defined(__UCLIBC__) && !defined(VGO_aix5) && !defined(ANDROID) 61 extern void __libc_freeres(void); 62 __libc_freeres(); 63 #endif 64 VALGRIND_DO_CLIENT_REQUEST(res, 0 /* default */, 65 VG_USERREQ__LIBC_FREERES_DONE, 66 0, 0, 0, 0, 0); 67 /*NOTREACHED*/ 68 *(volatile int *)0 = 'x'; 69 } 70 71 /* --------------------------------------------------------------------- 72 Wrapper for indirect functions which need to be redirected. 73 ------------------------------------------------------------------ */ 74 75 void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void); 76 void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void) 77 { 78 OrigFn fn; 79 Addr result = 0; 80 int res; 81 82 /* Call the original indirect function and get it's result */ 83 VALGRIND_GET_ORIG_FN(fn); 84 CALL_FN_W_v(result, fn); 85 86 /* Ask the valgrind core running on the real CPU (as opposed to this 87 code which runs on the emulated CPU) to update the redirection that 88 led to this function. This client request eventually gives control to 89 the function VG_(redir_add_ifunc_target) in m_redir.c */ 90 VALGRIND_DO_CLIENT_REQUEST(res, 0, 91 VG_USERREQ__ADD_IFUNC_TARGET, 92 fn.nraddr, result, 0, 0, 0); 93 return (void*)result; 94 } 95 96 #elif defined(VGO_darwin) 97 98 #include "config.h" /* VERSION */ 99 100 /* --------------------------------------------------------------------- 101 Darwin crash log hints 102 ------------------------------------------------------------------ */ 103 104 /* This string will be inserted into crash logs, so crashes while 105 running under Valgrind can be distinguished from other crashes. */ 106 __private_extern__ char *__crashreporter_info__ = "Instrumented by Valgrind " VERSION; 107 108 /* --------------------------------------------------------------------- 109 Darwin environment cleanup 110 ------------------------------------------------------------------ */ 111 112 /* Scrubbing DYLD_INSERT_LIBRARIES from envp during exec is insufficient, 113 as there are other ways to launch a process with environment that 114 valgrind can't catch easily (i.e. launchd). 115 Instead, scrub DYLD_INSERT_LIBRARIES from the parent process once 116 dyld is done loading vg_preload.so. 117 */ 118 #include <string.h> 119 #include <crt_externs.h> 120 121 // GrP fixme copied from m_libcproc 122 static void env_unsetenv ( Char **env, const Char *varname ) 123 { 124 Char **from; 125 Char **to = NULL; 126 Int len = strlen(varname); 127 128 for (from = to = env; from && *from; from++) { 129 if (!(strncmp(varname, *from, len) == 0 && (*from)[len] == '=')) { 130 *to = *from; 131 to++; 132 } 133 } 134 *(to++) = *(from++); 135 /* fix the 4th "char* apple" pointer (aka. executable path pointer) */ 136 *(to++) = *(from++); 137 *to = NULL; 138 } 139 140 static void vg_cleanup_env(void) __attribute__((constructor)); 141 static void vg_cleanup_env(void) 142 { 143 Char **envp = (Char**)*_NSGetEnviron(); 144 env_unsetenv(envp, "VALGRIND_LAUNCHER"); 145 env_unsetenv(envp, "DYLD_SHARED_REGION"); 146 // GrP fixme should be more like mash_colon_env() 147 env_unsetenv(envp, "DYLD_INSERT_LIBRARIES"); 148 } 149 150 /* --------------------------------------------------------------------- 151 Darwin arc4random (rdar://6166275) 152 ------------------------------------------------------------------ */ 153 154 #include <fcntl.h> 155 #include <unistd.h> 156 157 int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void); 158 int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void) 159 { 160 static int rnd = -1; 161 int result; 162 163 if (rnd < 0) rnd = open("/dev/random", O_RDONLY); 164 165 read(rnd, &result, sizeof(result)); 166 return result; 167 } 168 169 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void); 170 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void) 171 { 172 // do nothing 173 } 174 175 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen); 176 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen) 177 { 178 // do nothing 179 // GrP fixme ought to check [dat..dat+datlen) is defined 180 // but don't care if it's initialized 181 } 182 183 #else 184 185 # error Unknown OS 186 #endif 187 188 /*--------------------------------------------------------------------*/ 189 /*--- end ---*/ 190 /*--------------------------------------------------------------------*/ 191
