1
2/*--------------------------------------------------------------------*/
3/*--- The trampoline code page.              pub_core_trampoline.h ---*/
4/*--------------------------------------------------------------------*/
5
6/*
7   This file is part of Valgrind, a dynamic binary instrumentation
8   framework.
9
10   Copyright (C) 2000-2011 Julian Seward
11      jseward@acm.org
12
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.
17
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.
22
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
26   02111-1307, USA.
27
28   The GNU General Public License is contained in the file COPYING.
29*/
30
31#ifndef __PUB_CORE_TRAMPOLINE_H
32#define __PUB_CORE_TRAMPOLINE_H
33
34//--------------------------------------------------------------------
35// PURPOSE: This module defines a few replacement functions for Linux
36// vsyscalls, which we can't implement directly.  It also contains
37// stubs for signal returns.  Note, all the code within runs on the
38// simulated CPU.  The vsyscall stubs are gotten to by use of the
39// redirect mechanism.
40//
41// Note: generally, putting replacement functions in here is a bad
42// idea, since any Dwarf frame-unwind info attached to them will not
43// be seen by the unwinder in gcc's runtime support.  This means
44// unwinding during exception handling by gcc tends to fail if it
45// encounters one of these replacement functions.  A better place to
46// put them is in one of the .so's preloaded into the client, since
47// the client's ld.so will know about it and so gcc's unwinder
48// (somehow) is able to get hold of it.
49//--------------------------------------------------------------------
50
51/* These two delimit our handwritten assembly code, so we can tell
52   tools which track memory that this area should be regarded as
53   readable, at least.  Otherwise Memcheck complains we're jumping to
54   invalid addresses. */
55
56extern Addr VG_(trampoline_stuff_start);
57extern Addr VG_(trampoline_stuff_end);
58
59#if defined(VGP_x86_linux)
60extern Addr VG_(x86_linux_SUBST_FOR_sigreturn);
61extern Addr VG_(x86_linux_SUBST_FOR_rt_sigreturn);
62extern Char* VG_(x86_linux_REDIR_FOR_index) ( const Char*, Int );
63extern UInt VG_(x86_linux_REDIR_FOR_strlen)( void* );
64#endif
65
66#if defined(VGP_amd64_linux)
67extern Addr VG_(amd64_linux_SUBST_FOR_rt_sigreturn);
68extern Addr VG_(amd64_linux_REDIR_FOR_vgettimeofday);
69extern Addr VG_(amd64_linux_REDIR_FOR_vtime);
70extern UInt VG_(amd64_linux_REDIR_FOR_strlen)( void* );
71#endif
72
73#if defined(VGP_ppc32_linux)
74extern Addr  VG_(ppc32_linux_SUBST_FOR_sigreturn);
75extern Addr  VG_(ppc32_linux_SUBST_FOR_rt_sigreturn);
76extern UInt  VG_(ppc32_linux_REDIR_FOR_strlen)( void* );
77extern UInt  VG_(ppc32_linux_REDIR_FOR_strcmp)( void*, void* );
78extern void* VG_(ppc32_linux_REDIR_FOR_strchr)( void*, Int );
79#endif
80
81#if defined(VGP_ppc64_linux)
82extern Addr  VG_(ppc64_linux_SUBST_FOR_rt_sigreturn);
83extern UInt  VG_(ppc64_linux_REDIR_FOR_strlen)( void* );
84extern void* VG_(ppc64_linux_REDIR_FOR_strchr)( void*, Int );
85/* A label (sans dot) marking the ultra-magical return stub via which
86   all redirected and wrapped functions are made to "return" on
87   ppc64-linux.  The one insn at this label is never really
88   translated.  Instead, m_translate generates IR to restore the
89   thread's LR and R2 registers from a small stack in the ppc64 guest
90   state structure, and then branch to LR.  Convoluted?  Confusing?
91   You betcha.  Could I think of anything simpler?  No. */
92extern Addr VG_(ppctoc_magic_redirect_return_stub);
93#endif
94
95#if defined(VGP_arm_linux)
96extern UInt  VG_(arm_linux_REDIR_FOR_strlen)( void* );
97//extern void* VG_(arm_linux_REDIR_FOR_index) ( void*, Int );
98extern void* VG_(arm_linux_REDIR_FOR_memcpy)( void*, void*, Int );
99#endif
100
101#if defined(VGP_x86_darwin)
102extern Addr  VG_(x86_darwin_SUBST_FOR_sigreturn);
103extern SizeT VG_(x86_darwin_REDIR_FOR_strlen)( void* );
104extern SizeT VG_(x86_darwin_REDIR_FOR_strcmp)( void*, void* );
105extern void* VG_(x86_darwin_REDIR_FOR_strcat)( void*, void * );
106extern char* VG_(x86_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
107extern SizeT VG_(x86_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
108                                                SizeT size );
109#endif
110
111#if defined(VGP_amd64_darwin)
112extern Addr  VG_(amd64_darwin_SUBST_FOR_sigreturn);
113extern SizeT VG_(amd64_darwin_REDIR_FOR_strlen)( void* );
114extern SizeT VG_(amd64_darwin_REDIR_FOR_strcmp)( void*, void* );
115extern void* VG_(amd64_darwin_REDIR_FOR_strcat)( void*, void * );
116extern char* VG_(amd64_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
117extern SizeT VG_(amd64_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
118                                                  SizeT size );
119extern UInt VG_(amd64_darwin_REDIR_FOR_arc4random)( void );
120#endif
121
122#if defined(VGP_s390x_linux)
123extern Addr VG_(s390x_linux_SUBST_FOR_sigreturn);
124extern Addr VG_(s390x_linux_SUBST_FOR_rt_sigreturn);
125#endif
126
127#endif   // __PUB_CORE_TRAMPOLINE_H
128
129/*--------------------------------------------------------------------*/
130/*--- end                                                          ---*/
131/*--------------------------------------------------------------------*/
132