| |
| /*--------------------------------------------------------------------*/ |
| /*--- Intercepts for various libc functions we want to capture ---*/ |
| /*--- (mostly for threading purposes). vg_intercept.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, an extensible x86 protected-mode |
| emulator for monitoring program execution on x86-Unixes. |
| |
| Copyright (C) 2000-2004 Julian Seward |
| jseward@acm.org |
| |
| 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 |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 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. |
| */ |
| |
| |
| /* --------------------------------------------------------------------- |
| ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU. It is |
| intended for various reasons as drop-in replacements for libc |
| functions. These functions are not called directly - they're the |
| targets of code redirection. They're named the same as the library |
| functions they replace so that messages printing their names are |
| sensible, but the we don't really require the dynamic linker to find |
| them. |
| ------------------------------------------------------------------ */ |
| |
| #include "valgrind.h" |
| #include "vg_include.h" |
| #include <unistd.h> |
| #include <signal.h> |
| |
| static void init(void) __attribute__((constructor)); |
| static int init_done; |
| |
| int raise(int sig) |
| { |
| if (!init_done) |
| init(); |
| |
| return kill(getpid(), sig); |
| } |
| int __libc_raise(int) __attribute__((alias("raise"), visibility("protected"))); |
| int __GI_raise(int) __attribute__((alias("raise"), visibility("protected"))); |
| |
| /* Don't alias, so there's no chance that "gsignal" will appear in a |
| message instead of "raise" */ |
| int gsignal(int sig) |
| { |
| return raise(sig); |
| } |
| |
| /* --------------------------------------------------------------------- |
| Hook for running __libc_freeres once the program exits. |
| ------------------------------------------------------------------ */ |
| |
| static void VGINJ_(__libc_freeres_wrapper)( void ) |
| { |
| int res; |
| #ifndef __UCLIBC__ |
| extern void __libc_freeres(void); |
| __libc_freeres(); |
| #endif |
| VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| VG_USERREQ__LIBC_FREERES_DONE, 0, 0, 0, 0); |
| /*NOTREACHED*/ |
| *(int *)0 = 'x'; |
| } |
| |
| static const struct { |
| const char *fromlib, *fromsym; |
| const void *toaddr; |
| } redirects[] = { |
| #define _S(x) #x |
| #define S(x) _S(x) |
| #define E(l, pfx, s) { "soname:" l, pfx #s, (void *)s } |
| #define R(l, s) \ |
| E(l, "", s), \ |
| E(l, "__", s), \ |
| E(l, "__libc_", s), \ |
| E(l, "__GI_", s) |
| |
| R("libc.so.6", raise), |
| R("libc.so.6", gsignal), |
| #undef R |
| }; |
| |
| static void init(void) |
| { |
| int i; |
| int res; |
| |
| if (init_done) |
| return; |
| init_done = 1; |
| |
| VALGRIND_MAGIC_SEQUENCE(res, -1, VG_USERREQ__REGISTER_LIBC_FREERES, |
| (Addr)VGINJ_(__libc_freeres_wrapper), 0, 0, 0); |
| |
| for(i = 0; i < sizeof(redirects)/sizeof(*redirects); i++) { |
| VALGRIND_MAGIC_SEQUENCE(res, -1, VG_USERREQ__REGISTER_REDIRECT_ADDR, |
| redirects[i].fromlib, redirects[i].fromsym, |
| redirects[i].toaddr, 0); |
| } |
| } |
| |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end vg_intercept.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |