2 /*--------------------------------------------------------------------*/
3 /*--- Client-space code for the core. vg_preloaded.c ---*/
4 /*--------------------------------------------------------------------*/
7 This file is part of Valgrind, a dynamic binary instrumentation
10 Copyright (C) 2000-2010 Julian Seward
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.
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.
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
28 The GNU General Public License is contained in the file COPYING.
32 /* ---------------------------------------------------------------------
33 ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU.
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.
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 ------------------------------------------------------------------ */
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
50 #if defined(VGO_linux) || defined(VGO_aix5) || defined(VGO_l4re)
52 /* ---------------------------------------------------------------------
53 Hook for running __libc_freeres once the program exits.
54 ------------------------------------------------------------------ */
56 void VG_NOTIFY_ON_LOAD(freeres)( void );
57 void VG_NOTIFY_ON_LOAD(freeres)( void )
59 #if !defined(__UCLIBC__) && !defined(VGO_aix5)
60 extern void __libc_freeres(void);
63 VALGRIND_DO_CLIENT_REQUEST_EXPR(0 /* default */,
64 VG_USERREQ__LIBC_FREERES_DONE,
67 *(volatile int *)0 = 'x';
70 /* ---------------------------------------------------------------------
71 Wrapper for indirect functions which need to be redirected.
72 ------------------------------------------------------------------ */
74 void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void);
75 void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void)
80 /* Call the original indirect function and get it's result */
81 VALGRIND_GET_ORIG_FN(fn);
82 CALL_FN_W_v(result, fn);
84 /* Ask the valgrind core running on the real CPU (as opposed to this
85 code which runs on the emulated CPU) to update the redirection that
86 led to this function. This client request eventually gives control to
87 the function VG_(redir_add_ifunc_target) in m_redir.c */
88 VALGRIND_DO_CLIENT_REQUEST_EXPR(0, VG_USERREQ__ADD_IFUNC_TARGET,
89 fn.nraddr, result, 0, 0, 0);
93 #elif defined(VGO_darwin)
95 #include "config.h" /* VERSION */
97 /* ---------------------------------------------------------------------
98 Darwin crash log hints
99 ------------------------------------------------------------------ */
101 /* This string will be inserted into crash logs, so crashes while
102 running under Valgrind can be distinguished from other crashes. */
103 __private_extern__ char *__crashreporter_info__ = "Instrumented by Valgrind " VERSION;
105 /* ---------------------------------------------------------------------
106 Darwin environment cleanup
107 ------------------------------------------------------------------ */
109 /* Scrubbing DYLD_INSERT_LIBRARIES from envp during exec is insufficient,
110 as there are other ways to launch a process with environment that
111 valgrind can't catch easily (i.e. launchd).
112 Instead, scrub DYLD_INSERT_LIBRARIES from the parent process once
113 dyld is done loading vg_preload.so.
116 #include <crt_externs.h>
118 // GrP fixme copied from m_libcproc
119 static void env_unsetenv ( Char **env, const Char *varname )
123 Int len = strlen(varname);
125 for (from = to = env; from && *from; from++) {
126 if (!(strncmp(varname, *from, len) == 0 && (*from)[len] == '=')) {
132 /* fix the 4th "char* apple" pointer (aka. executable path pointer) */
137 static void vg_cleanup_env(void) __attribute__((constructor));
138 static void vg_cleanup_env(void)
140 Char **envp = (Char**)*_NSGetEnviron();
141 env_unsetenv(envp, "VALGRIND_LAUNCHER");
142 env_unsetenv(envp, "DYLD_SHARED_REGION");
143 // GrP fixme should be more like mash_colon_env()
144 env_unsetenv(envp, "DYLD_INSERT_LIBRARIES");
147 /* ---------------------------------------------------------------------
148 Darwin arc4random (rdar://6166275)
149 ------------------------------------------------------------------ */
154 int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void);
155 int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void)
160 if (rnd < 0) rnd = open("/dev/random", O_RDONLY);
162 read(rnd, &result, sizeof(result));
166 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void);
167 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void)
172 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen);
173 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen)
176 // GrP fixme ought to check [dat..dat+datlen) is defined
177 // but don't care if it's initialized
185 /*--------------------------------------------------------------------*/
187 /*--------------------------------------------------------------------*/