blob: fbb2e285f946252ff8ad39fe8ff0ef202677288b [file] [log] [blame]
/*--- Client-space code for the core. vg_preloaded.c ---*/
This file is part of Valgrind, a dynamic binary instrumentation
Copyright (C) 2000-2013 Julian Seward
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 2 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
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., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
/* ---------------------------------------------------------------------
These functions are not called directly - they're the targets of code
redirection or load notifications (see pub_core_redir.h for info).
They're named weirdly so that the intercept code can find them when the
shared object is initially loaded.
Note that this filename has the "vg_" prefix because it can appear
in stack traces, and the "vg_" makes it a little clearer that it
originates from Valgrind.
------------------------------------------------------------------ */
#include "pub_core_basics.h"
#include "pub_core_clreq.h"
#include "pub_core_debuginfo.h" // Needed for pub_core_redir.h
#include "pub_core_redir.h" // For VG_NOTIFY_ON_LOAD
#if defined(VGO_linux)
/* ---------------------------------------------------------------------
Hook for running __libc_freeres once the program exits.
------------------------------------------------------------------ */
void VG_NOTIFY_ON_LOAD(freeres)( void );
void VG_NOTIFY_ON_LOAD(freeres)( void )
# if !defined(__UCLIBC__) \
&& !defined(VGPV_arm_linux_android) \
&& !defined(VGPV_x86_linux_android) \
&& !defined(VGPV_mips32_linux_android) \
&& !defined(VGPV_arm64_linux_android)
extern void __libc_freeres(void);
# endif
0, 0, 0, 0, 0);
*(volatile int *)0 = 'x';
/* ---------------------------------------------------------------------
Wrapper for indirect functions which need to be redirected.
------------------------------------------------------------------ */
void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void);
void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void)
OrigFn fn;
Addr result = 0;
Addr fnentry;
/* Call the original indirect function and get it's result */
CALL_FN_W_v(result, fn);
#if defined(VGP_ppc64be_linux)
/* ppc64be uses function descriptors, so get the actual function entry
address for the client request, but return the function descriptor
from this function.
result points to the function descriptor, which starts with the
function entry. */
fnentry = *(Addr*)result;
fnentry = result;
/* Ask the valgrind core running on the real CPU (as opposed to this
code which runs on the emulated CPU) to update the redirection that
led to this function. This client request eventually gives control to
the function VG_(redir_add_ifunc_target) in m_redir.c */
fn.nraddr, fnentry, 0, 0, 0);
return (void*)result;
#elif defined(VGO_darwin)
#include "config.h" /* VERSION */
/* ---------------------------------------------------------------------
Darwin crash log hints
------------------------------------------------------------------ */
/* This string will be inserted into crash logs, so crashes while
running under Valgrind can be distinguished from other crashes. */
__private_extern__ const char *__crashreporter_info__ = "Instrumented by Valgrind " VERSION;
/* ---------------------------------------------------------------------
Darwin environment cleanup
------------------------------------------------------------------ */
/* Scrubbing DYLD_INSERT_LIBRARIES from envp during exec is insufficient,
as there are other ways to launch a process with environment that
valgrind can't catch easily (i.e. launchd).
Instead, scrub DYLD_INSERT_LIBRARIES from the parent process once
dyld is done loading
#include <string.h>
#include <crt_externs.h>
// GrP fixme copied from m_libcproc
static void env_unsetenv ( HChar **env, const HChar *varname )
HChar **from;
HChar **to = NULL;
Int len = strlen(varname);
for (from = to = env; from && *from; from++) {
if (!(strncmp(varname, *from, len) == 0 && (*from)[len] == '=')) {
*to = *from;
*(to++) = *(from++);
/* fix the 4th "char* apple" pointer (aka. executable path pointer) */
*(to++) = *(from++);
*to = NULL;
static void vg_cleanup_env(void) __attribute__((constructor));
static void vg_cleanup_env(void)
HChar **envp = (HChar**)*_NSGetEnviron();
env_unsetenv(envp, "VALGRIND_LAUNCHER");
env_unsetenv(envp, "DYLD_SHARED_REGION");
// GrP fixme should be more like mash_colon_env()
env_unsetenv(envp, "DYLD_INSERT_LIBRARIES");
/* ---------------------------------------------------------------------
Darwin arc4random (rdar://6166275)
------------------------------------------------------------------ */
#include <fcntl.h>
#include <unistd.h>
int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void);
int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void)
static int rnd = -1;
int result;
if (rnd < 0) rnd = open("/dev/random", O_RDONLY);
read(rnd, &result, sizeof(result));
return result;
void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void);
void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void)
// do nothing
void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen);
void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen)
// do nothing
// GrP fixme ought to check [dat..dat+datlen) is defined
// but don't care if it's initialized
# error Unknown OS
/*--- end ---*/