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) 2000-2013 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#include "pub_core_basics.h"   // VG_ macro
35
36//--------------------------------------------------------------------
37// PURPOSE: This module defines a few replacement functions for Linux
38// vsyscalls, which we can't implement directly.  It also contains
39// stubs for signal returns.  Note, all the code within runs on the
40// simulated CPU.  The vsyscall stubs are gotten to by use of the
41// redirect mechanism.
42//
43// Note: generally, putting replacement functions in here is a bad
44// idea, since any Dwarf frame-unwind info attached to them will not
45// be seen by the unwinder in gcc's runtime support.  This means
46// unwinding during exception handling by gcc tends to fail if it
47// encounters one of these replacement functions.  A better place to
48// put them is in one of the .so's preloaded into the client, since
49// the client's ld.so will know about it and so gcc's unwinder
50// (somehow) is able to get hold of it.
51//--------------------------------------------------------------------
52
53/* These two delimit our handwritten assembly code, so we can tell
54   tools which track memory that this area should be regarded as
55   readable, at least.  Otherwise Memcheck complains we're jumping to
56   invalid addresses. */
57
58extern Addr VG_(trampoline_stuff_start);
59extern Addr VG_(trampoline_stuff_end);
60
61#if defined(VGP_x86_linux)
62extern Addr VG_(x86_linux_SUBST_FOR_sigreturn);
63extern Addr VG_(x86_linux_SUBST_FOR_rt_sigreturn);
64extern Char* VG_(x86_linux_REDIR_FOR_index) ( const Char*, Int );
65extern UInt VG_(x86_linux_REDIR_FOR_strlen)( void* );
66#endif
67
68#if defined(VGP_amd64_linux)
69extern Addr VG_(amd64_linux_SUBST_FOR_rt_sigreturn);
70extern Addr VG_(amd64_linux_REDIR_FOR_vgettimeofday);
71extern Addr VG_(amd64_linux_REDIR_FOR_vtime);
72extern Addr VG_(amd64_linux_REDIR_FOR_vgetcpu);
73extern UInt VG_(amd64_linux_REDIR_FOR_strlen)( void* );
74#endif
75
76#if defined(VGP_ppc32_linux)
77extern Addr  VG_(ppc32_linux_SUBST_FOR_sigreturn);
78extern Addr  VG_(ppc32_linux_SUBST_FOR_rt_sigreturn);
79extern UInt  VG_(ppc32_linux_REDIR_FOR_strlen)( void* );
80extern UInt  VG_(ppc32_linux_REDIR_FOR_strcmp)( void*, void* );
81extern void* VG_(ppc32_linux_REDIR_FOR_strchr)( void*, Int );
82#endif
83
84#if defined(VGP_ppc64_linux)
85extern Addr  VG_(ppc64_linux_SUBST_FOR_rt_sigreturn);
86extern UInt  VG_(ppc64_linux_REDIR_FOR_strlen)( void* );
87extern void* VG_(ppc64_linux_REDIR_FOR_strchr)( void*, Int );
88/* A label (sans dot) marking the ultra-magical return stub via which
89   all redirected and wrapped functions are made to "return" on
90   ppc64-linux.  The one insn at this label is never really
91   translated.  Instead, m_translate generates IR to restore the
92   thread's LR and R2 registers from a small stack in the ppc64 guest
93   state structure, and then branch to LR.  Convoluted?  Confusing?
94   You betcha.  Could I think of anything simpler?  No. */
95extern Addr VG_(ppctoc_magic_redirect_return_stub);
96#endif
97
98#if defined(VGP_arm_linux)
99extern Addr  VG_(arm_linux_SUBST_FOR_sigreturn);
100extern Addr  VG_(arm_linux_SUBST_FOR_rt_sigreturn);
101extern UInt  VG_(arm_linux_REDIR_FOR_strlen)( void* );
102//extern void* VG_(arm_linux_REDIR_FOR_index) ( void*, Int );
103extern void* VG_(arm_linux_REDIR_FOR_memcpy)( void*, void*, Int );
104#endif
105
106#if defined(VGP_arm64_linux)
107extern Addr  VG_(arm64_linux_SUBST_FOR_rt_sigreturn);
108extern ULong VG_(arm64_linux_REDIR_FOR_strlen)( void* );
109extern void* VG_(arm64_linux_REDIR_FOR_index) ( void*, Long );
110extern Long  VG_(arm64_linux_REDIR_FOR_strcmp)( void*, void* );
111#endif
112
113#if defined(VGP_x86_darwin)
114extern Addr  VG_(x86_darwin_SUBST_FOR_sigreturn);
115extern SizeT VG_(x86_darwin_REDIR_FOR_strlen)( void* );
116extern SizeT VG_(x86_darwin_REDIR_FOR_strcmp)( void*, void* );
117extern void* VG_(x86_darwin_REDIR_FOR_strcat)( void*, void * );
118extern char* VG_(x86_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
119extern SizeT VG_(x86_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
120                                                SizeT size );
121#endif
122
123#if defined(VGP_amd64_darwin)
124extern Addr  VG_(amd64_darwin_SUBST_FOR_sigreturn);
125extern SizeT VG_(amd64_darwin_REDIR_FOR_strlen)( void* );
126extern SizeT VG_(amd64_darwin_REDIR_FOR_strcmp)( void*, void* );
127extern void* VG_(amd64_darwin_REDIR_FOR_strcat)( void*, void * );
128extern char* VG_(amd64_darwin_REDIR_FOR_strcpy)( char *s1, char *s2 );
129extern SizeT VG_(amd64_darwin_REDIR_FOR_strlcat)( char *s1, const char *s2,
130                                                  SizeT size );
131extern UInt VG_(amd64_darwin_REDIR_FOR_arc4random)( void );
132#endif
133
134#if defined(VGP_s390x_linux)
135extern Addr VG_(s390x_linux_SUBST_FOR_sigreturn);
136extern Addr VG_(s390x_linux_SUBST_FOR_rt_sigreturn);
137#endif
138
139#if defined(VGP_mips32_linux)
140extern Addr  VG_(mips32_linux_SUBST_FOR_sigreturn);
141extern Addr  VG_(mips32_linux_SUBST_FOR_rt_sigreturn);
142extern UInt  VG_(mips32_linux_REDIR_FOR_strlen)( void* );
143#endif
144
145#if defined(VGP_mips64_linux)
146extern Addr  VG_(mips64_linux_SUBST_FOR_rt_sigreturn);
147extern UInt  VG_(mips64_linux_REDIR_FOR_strlen)( void* );
148#endif
149
150#endif   // __PUB_CORE_TRAMPOLINE_H
151
152/*--------------------------------------------------------------------*/
153/*--- end                                                          ---*/
154/*--------------------------------------------------------------------*/
155