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/*--- The trampoline code page. pub_core_trampoline.h ---*/
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.
#include "pub_core_basics.h" // VG_ macro
// PURPOSE: This module defines a few replacement functions for Linux
// vsyscalls, which we can't implement directly. It also contains
// stubs for signal returns. Note, all the code within runs on the
// simulated CPU. The vsyscall stubs are gotten to by use of the
// redirect mechanism.
// Note: generally, putting replacement functions in here is a bad
// idea, since any Dwarf frame-unwind info attached to them will not
// be seen by the unwinder in gcc's runtime support. This means
// unwinding during exception handling by gcc tends to fail if it
// encounters one of these replacement functions. A better place to
// put them is in one of the .so's preloaded into the client, since
// the client's will know about it and so gcc's unwinder
// (somehow) is able to get hold of it.
/* These two delimit our handwritten assembly code, so we can tell
tools which track memory that this area should be regarded as
readable, at least. Otherwise Memcheck complains we're jumping to
invalid addresses. */
extern Addr VG_(trampoline_stuff_start);
extern Addr VG_(trampoline_stuff_end);
#if defined(VGP_x86_linux)
extern Addr VG_(x86_linux_SUBST_FOR_sigreturn);
extern Addr VG_(x86_linux_SUBST_FOR_rt_sigreturn);
extern Char* VG_(x86_linux_REDIR_FOR_index) ( const Char*, Int );
extern UInt VG_(x86_linux_REDIR_FOR_strlen)( void* );
#if defined(VGP_amd64_linux)
extern Addr VG_(amd64_linux_SUBST_FOR_rt_sigreturn);
extern Addr VG_(amd64_linux_REDIR_FOR_vgettimeofday);
extern Addr VG_(amd64_linux_REDIR_FOR_vtime);
extern Addr VG_(amd64_linux_REDIR_FOR_vgetcpu);
extern UInt VG_(amd64_linux_REDIR_FOR_strlen)( void* );
#if defined(VGP_ppc32_linux)
extern Addr VG_(ppc32_linux_SUBST_FOR_sigreturn);
extern Addr VG_(ppc32_linux_SUBST_FOR_rt_sigreturn);
extern UInt VG_(ppc32_linux_REDIR_FOR_strlen)( void* );
extern UInt VG_(ppc32_linux_REDIR_FOR_strcmp)( void*, void* );
extern void* VG_(ppc32_linux_REDIR_FOR_strchr)( void*, Int );
#if defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
extern Addr VG_(ppc64_linux_SUBST_FOR_rt_sigreturn);
extern UInt VG_(ppc64_linux_REDIR_FOR_strlen)( void* );
extern void* VG_(ppc64_linux_REDIR_FOR_strchr)( void*, Int );
/* A label (sans dot) marking the ultra-magical return stub via which
all redirected and wrapped functions are made to "return" on
ppc64-linux. The one insn at this label is never really
translated. Instead, m_translate generates IR to restore the
thread's LR and R2 registers from a small stack in the ppc64 guest
state structure, and then branch to LR. Convoluted? Confusing?
You betcha. Could I think of anything simpler? No. */
extern Addr VG_(ppctoc_magic_redirect_return_stub);
#if defined(VGP_arm_linux)
extern Addr VG_(arm_linux_SUBST_FOR_sigreturn);
extern Addr VG_(arm_linux_SUBST_FOR_rt_sigreturn);
extern UInt VG_(arm_linux_REDIR_FOR_strlen)( void* );
//extern void* VG_(arm_linux_REDIR_FOR_index) ( void*, Int );
extern void* VG_(arm_linux_REDIR_FOR_memcpy)( void*, void*, Int );
extern void* VG_(arm_linux_REDIR_FOR_strcmp)( void*, void* );
#if defined(VGP_tilegx_linux)
extern Addr VG_(tilegx_linux_SUBST_FOR_rt_sigreturn);
extern UInt VG_(tilegx_linux_REDIR_FOR_strlen)( void* );
#if defined(VGP_arm64_linux)
extern Addr VG_(arm64_linux_SUBST_FOR_rt_sigreturn);
extern ULong VG_(arm64_linux_REDIR_FOR_strlen)( void* );
extern void* VG_(arm64_linux_REDIR_FOR_index) ( void*, Long );
extern Long VG_(arm64_linux_REDIR_FOR_strcmp)( void*, void* );
#if defined(VGP_x86_darwin)
extern Addr VG_(x86_darwin_SUBST_FOR_sigreturn);
extern SizeT VG_(x86_darwin_REDIR_FOR_strlen)( void* );
extern SizeT VG_(x86_darwin_REDIR_FOR_strcmp)( void*, void* );
extern void* VG_(x86_darwin_REDIR_FOR_strcat)( void*, void * );
extern char* VG_(x86_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
extern SizeT VG_(x86_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
SizeT size );
#if defined(VGP_amd64_darwin)
extern Addr VG_(amd64_darwin_SUBST_FOR_sigreturn);
extern SizeT VG_(amd64_darwin_REDIR_FOR_strlen)( void* );
extern SizeT VG_(amd64_darwin_REDIR_FOR_strcmp)( void*, void* );
extern void* VG_(amd64_darwin_REDIR_FOR_strcat)( void*, void * );
extern char* VG_(amd64_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
extern SizeT VG_(amd64_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
SizeT size );
extern UInt VG_(amd64_darwin_REDIR_FOR_arc4random)( void );
extern char* VG_(amd64_darwin_REDIR_FOR_strchr)( const char*, int );
# endif
#if defined(VGP_s390x_linux)
extern Addr VG_(s390x_linux_SUBST_FOR_sigreturn);
extern Addr VG_(s390x_linux_SUBST_FOR_rt_sigreturn);
// Note: Long for the 2nd parameter because according to z-series ABI,
// section "Parameter Passing" SIMPLE_ARG:
// "Values shorter than 64 bits are sign- or zero-extended
// (as appropriate) to 64 bits."
extern void* VG_(s390x_linux_REDIR_FOR_index) ( void*, Long );
#if defined(VGP_mips32_linux)
extern Addr VG_(mips32_linux_SUBST_FOR_sigreturn);
extern Addr VG_(mips32_linux_SUBST_FOR_rt_sigreturn);
extern UInt VG_(mips32_linux_REDIR_FOR_strlen)( void* );
#if defined(VGP_mips64_linux)
extern Addr VG_(mips64_linux_SUBST_FOR_rt_sigreturn);
extern UInt VG_(mips64_linux_REDIR_FOR_strlen)( void* );
/*--- end ---*/