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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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129 lines
4.9 KiB
Plaintext
129 lines
4.9 KiB
Plaintext
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/*--------------------------------------------------------------------*/
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/*--- Intercepts for various libc functions we want to capture ---*/
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/*--- (mostly for threading purposes). vg_intercept.c ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, an extensible x86 protected-mode
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emulator for monitoring program execution on x86-Unixes.
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Copyright (C) 2000-2004 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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/* ---------------------------------------------------------------------
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ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU. It is
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intended for various reasons as drop-in replacements for libc
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functions. These functions are not called directly - they're the
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targets of code redirection. They're named weirdly so that the
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intercept code can find them when the shared object is initially
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loaded.
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------------------------------------------------------------------ */
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/*
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The gory details: Symbols in this file are mangled by a preprocessor
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to produce a special symbol name. All symbols that need this handling
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should be passed to a special VG_INTERCEPT macro. This macro takes
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two arguments: a library name and a function name. These specify the
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function and the library that contains it that we need to intercept.
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For example:
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int VG_INTERCEPT(soname:libc.so.6, raise)(int sig) { ... }
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This example says that the "raise" function in the shared object
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libc.so.6 should be intercepted and redirected to the following piece
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of code.
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Internally, what's happening here is that this intercept gets turned
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into a special magic symbol name, with the ':' and '.' parts replaced
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by escapes, and a special prefix stuck on front. When we slurp in
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an object file, we scan the symbol table for the magic prefixes,
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demangle any symbols found and set up the intercepts that way.
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This is the safest way to do this, because we're not relying on
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intercepts being set up by code that may be called after other code
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that need the intercepts has had a chance to run.
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*/
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#include "valgrind.h"
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#include "core.h"
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#include <unistd.h>
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#include <signal.h>
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int VG_INTERCEPT(soname:libc.so.6, raise)(int sig)
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{
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return kill(getpid(), sig);
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}
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int VG_INTERCEPT(soname:libc.so.6, __libc_raise)(int)
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__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, raise)),
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visibility("protected")));
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int VG_INTERCEPT(soname:libc.so.6, __GI_raise)(int)
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__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, raise)),
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visibility("protected")));
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int VG_INTERCEPT(soname:libc.so.6, __raise)(int)
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__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, raise)),
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visibility("protected")));
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/* Don't alias, so there's no chance that "gsignal" will appear in a
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message instead of "raise" */
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int VG_INTERCEPT(soname:libc.so.6, gsignal)(int sig)
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{
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return VG_INTERCEPT(soname:libc.so.6, raise)(sig);
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}
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int VG_INTERCEPT(soname:libc.so.6, __libc_gsignal)(int)
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__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, gsignal)),
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visibility("protected")));
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int VG_INTERCEPT(soname:libc.so.6, __GI_gsignal)(int)
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__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, gsignal)),
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visibility("protected")));
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int VG_INTERCEPT(soname:libc.so.6, __gsignal)(int)
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__attribute__((alias(VG_INTERCEPT_ALIAS(soname:libc.so.6, gsignal)),
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visibility("protected")));
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/* ---------------------------------------------------------------------
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Hook for running __libc_freeres once the program exits.
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------------------------------------------------------------------ */
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void VG_WRAPPER(freeres)( void )
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{
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int res;
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#ifndef __UCLIBC__
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extern void __libc_freeres(void);
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__libc_freeres();
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#endif
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VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */,
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VG_USERREQ__LIBC_FREERES_DONE, 0, 0, 0, 0);
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/*NOTREACHED*/
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*(int *)0 = 'x';
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}
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/*--------------------------------------------------------------------*/
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/*--- end vg_intercept.c ---*/
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/*--------------------------------------------------------------------*/
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