/*--------------------------------------------------------------------*/
/*--- Ptrcheck: a pointer-use checker. pc_intercepts.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Ptrcheck, a Valgrind tool for checking pointer
use in programs.
Copyright (C) 2003-2013 Nicholas Nethercote
njn@valgrind.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.
*/
/* Nothing actually in here. However it appears this file is needed
to make malloc intercepting work. (jrs, 2 july 08 -- not sure about
that).
*/
#include "pub_tool_basics.h"
#include "pub_tool_hashtable.h"
#include "pub_tool_redir.h"
#include "pub_tool_tooliface.h"
#include "pub_tool_clreq.h"
/* The following intercepts are copied verbatim from
memcheck/mc_replace_strmem.c. If you copy more in, please keep
them in the same order as in mc_replace_strmem.c. */
#define STRRCHR(soname, fnname) \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname)( const char* s, int c ); \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname)( const char* s, int c ) \
{ \
HChar ch = (HChar)c; \
const HChar* p = s; \
const HChar* last = NULL; \
while (True) { \
if (*p == ch) last = p; \
if (*p == 0) return (HChar *)last; \
p++; \
} \
}
// Apparently rindex() is the same thing as strrchr()
STRRCHR(VG_Z_LIBC_SONAME, strrchr)
STRRCHR(VG_Z_LIBC_SONAME, rindex)
#if defined(VGO_linux)
STRRCHR(VG_Z_LIBC_SONAME, __GI_strrchr)
STRRCHR(VG_Z_LD_LINUX_SO_2, rindex)
#elif defined(VGO_darwin)
STRRCHR(VG_Z_DYLD, strrchr)
STRRCHR(VG_Z_DYLD, rindex)
#endif
#define STRCHR(soname, fnname) \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) ( const char* s, int c ); \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) ( const char* s, int c ) \
{ \
HChar ch = (HChar)c ; \
const HChar* p = s; \
while (True) { \
if (*p == ch) return (HChar *)p; \
if (*p == 0) return NULL; \
p++; \
} \
}
// Apparently index() is the same thing as strchr()
STRCHR(VG_Z_LIBC_SONAME, strchr)
STRCHR(VG_Z_LIBC_SONAME, index)
#if defined(VGO_linux)
STRCHR(VG_Z_LIBC_SONAME, __GI_strchr)
STRCHR(VG_Z_LD_LINUX_SO_2, strchr)
STRCHR(VG_Z_LD_LINUX_SO_2, index)
STRCHR(VG_Z_LD_LINUX_X86_64_SO_2, strchr)
STRCHR(VG_Z_LD_LINUX_X86_64_SO_2, index)
#elif defined(VGO_darwin)
STRCHR(VG_Z_DYLD, strchr)
STRCHR(VG_Z_DYLD, index)
#endif
#define STRNLEN(soname, fnname) \
SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname) ( const char* str, SizeT n ); \
SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname) ( const char* str, SizeT n ) \
{ \
SizeT i = 0; \
while (i < n && str[i] != 0) i++; \
return i; \
}
STRNLEN(VG_Z_LIBC_SONAME, strnlen)
// Note that this replacement often doesn't get used because gcc inlines
// calls to strlen() with its own built-in version. This can be very
// confusing if you aren't expecting it. Other small functions in this file
// may also be inline by gcc.
#define STRLEN(soname, fnname) \
SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname)( const char* str ); \
SizeT VG_REPLACE_FUNCTION_ZU(soname,fnname)( const char* str ) \
{ \
SizeT i = 0; \
while (str[i] != 0) i++; \
return i; \
}
STRLEN(VG_Z_LIBC_SONAME, strlen)
#if defined(VGO_linux)
STRLEN(VG_Z_LIBC_SONAME, __GI_strlen)
STRLEN(VG_Z_LD_LINUX_SO_2, strlen)
STRLEN(VG_Z_LD_LINUX_X86_64_SO_2, strlen)
STRLEN(VG_Z_LD_SO_1, strlen)
#endif
#define STRCPY(soname, fnname) \
char* VG_REPLACE_FUNCTION_ZU(soname, fnname) ( char* dst, const char* src ); \
char* VG_REPLACE_FUNCTION_ZU(soname, fnname) ( char* dst, const char* src ) \
{ \
HChar* dst_orig = dst; \
\
while (*src) *dst++ = *src++; \
*dst = 0; \
\
return dst_orig; \
}
STRCPY(VG_Z_LIBC_SONAME, strcpy)
#if defined(VGO_linux)
STRCPY(VG_Z_LIBC_SONAME, __GI_strcpy)
#elif defined(VGO_darwin)
STRCPY(VG_Z_DYLD, strcpy)
#endif
#define STRNCMP(soname, fnname) \
int VG_REPLACE_FUNCTION_ZU(soname,fnname) \
( const char* s1, const char* s2, SizeT nmax ); \
int VG_REPLACE_FUNCTION_ZU(soname,fnname) \
( const char* s1, const char* s2, SizeT nmax ) \
{ \
SizeT n = 0; \
while (True) { \
if (n >= nmax) return 0; \
if (*s1 == 0 && *s2 == 0) return 0; \
if (*s1 == 0) return -1; \
if (*s2 == 0) return 1; \
\
if (*(const unsigned char*)s1 < *(const unsigned char*)s2) return -1; \
if (*(const unsigned char*)s1 > *(const unsigned char*)s2) return 1; \
\
s1++; s2++; n++; \
} \
}
STRNCMP(VG_Z_LIBC_SONAME, strncmp)
#if defined(VGO_linux)
STRNCMP(VG_Z_LIBC_SONAME, __GI_strncmp)
#elif defined(VGO_darwin)
STRNCMP(VG_Z_DYLD, strncmp)
#endif
#define STRCMP(soname, fnname) \
int VG_REPLACE_FUNCTION_ZU(soname,fnname) \
( const char* s1, const char* s2 ); \
int VG_REPLACE_FUNCTION_ZU(soname,fnname) \
( const char* s1, const char* s2 ) \
{ \
register UChar c1; \
register UChar c2; \
while (True) { \
c1 = *(const UChar *)s1; \
c2 = *(const UChar *)s2; \
if (c1 != c2) break; \
if (c1 == 0) break; \
s1++; s2++; \
} \
if ((UChar)c1 < (UChar)c2) return -1; \
if ((UChar)c1 > (UChar)c2) return 1; \
return 0; \
}
STRCMP(VG_Z_LIBC_SONAME, strcmp)
#if defined(VGO_linux)
STRCMP(VG_Z_LIBC_SONAME, __GI_strcmp)
STRCMP(VG_Z_LD_LINUX_X86_64_SO_2, strcmp)
STRCMP(VG_Z_LD64_SO_1, strcmp)
#endif
#define MEMCHR(soname, fnname) \
void* VG_REPLACE_FUNCTION_ZU(soname,fnname) (const void *s, int c, SizeT n); \
void* VG_REPLACE_FUNCTION_ZU(soname,fnname) (const void *s, int c, SizeT n) \
{ \
SizeT i; \
UChar c0 = (UChar)c; \
const UChar* p = (const UChar*)s; \
for (i = 0; i < n; i++) \
if (p[i] == c0) return (void*)(&p[i]); \
return NULL; \
}
MEMCHR(VG_Z_LIBC_SONAME, memchr)
#if defined(VGO_darwin)
MEMCHR(VG_Z_DYLD, memchr)
#endif
#define MEMCPY(soname, fnname) \
void* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
( void *dst, const void *src, SizeT len ); \
void* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
( void *dst, const void *src, SizeT len ) \
{ \
const Addr WS = sizeof(UWord); /* 8 or 4 */ \
const Addr WM = WS - 1; /* 7 or 3 */ \
\
if (len > 0) { \
if (dst < src) { \
\
/* Copying backwards. */ \
SizeT n = len; \
Addr d = (Addr)dst; \
Addr s = (Addr)src; \
\
if (((s^d) & WM) == 0) { \
/* s and d have same UWord alignment. */ \
/* Pull up to a UWord boundary. */ \
while ((s & WM) != 0 && n >= 1) \
{ *(UChar*)d = *(UChar*)s; s += 1; d += 1; n -= 1; } \
/* Copy UWords. */ \
while (n >= WS) \
{ *(UWord*)d = *(UWord*)s; s += WS; d += WS; n -= WS; } \
if (n == 0) \
return dst; \
} \
if (((s|d) & 1) == 0) { \
/* Both are 16-aligned; copy what we can thusly. */ \
while (n >= 2) \
{ *(UShort*)d = *(UShort*)s; s += 2; d += 2; n -= 2; } \
} \
/* Copy leftovers, or everything if misaligned. */ \
while (n >= 1) \
{ *(UChar*)d = *(UChar*)s; s += 1; d += 1; n -= 1; } \
\
} else if (dst > src) { \
\
SizeT n = len; \
Addr d = ((Addr)dst) + n; \
Addr s = ((Addr)src) + n; \
\
/* Copying forwards. */ \
if (((s^d) & WM) == 0) { \
/* s and d have same UWord alignment. */ \
/* Back down to a UWord boundary. */ \
while ((s & WM) != 0 && n >= 1) \
{ s -= 1; d -= 1; *(UChar*)d = *(UChar*)s; n -= 1; } \
/* Copy UWords. */ \
while (n >= WS) \
{ s -= WS; d -= WS; *(UWord*)d = *(UWord*)s; n -= WS; } \
if (n == 0) \
return dst; \
} \
if (((s|d) & 1) == 0) { \
/* Both are 16-aligned; copy what we can thusly. */ \
while (n >= 2) \
{ s -= 2; d -= 2; *(UShort*)d = *(UShort*)s; n -= 2; } \
} \
/* Copy leftovers, or everything if misaligned. */ \
while (n >= 1) \
{ s -= 1; d -= 1; *(UChar*)d = *(UChar*)s; n -= 1; } \
\
} \
} \
\
return dst; \
}
MEMCPY(VG_Z_LIBC_SONAME, memcpy)
#if defined(VGO_linux)
MEMCPY(VG_Z_LD_SO_1, memcpy) /* ld.so.1 */
MEMCPY(VG_Z_LD64_SO_1, memcpy) /* ld64.so.1 */
#endif
/* Copy SRC to DEST, returning the address of the terminating '\0' in
DEST. (minor variant of strcpy) */
#define STPCPY(soname, fnname) \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) ( char* dst, const char* src ); \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) ( char* dst, const char* src ) \
{ \
while (*src) *dst++ = *src++; \
*dst = 0; \
\
return dst; \
}
STPCPY(VG_Z_LIBC_SONAME, stpcpy)
#if defined(VGO_linux)
STPCPY(VG_Z_LD_LINUX_SO_2, stpcpy)
STPCPY(VG_Z_LD_LINUX_X86_64_SO_2, stpcpy)
#endif
/* Find the first occurrence of C in S. */
#define GLIBC232_RAWMEMCHR(soname, fnname) \
void* VG_REPLACE_FUNCTION_ZU(soname,fnname) (const void* s, int c_in); \
void* VG_REPLACE_FUNCTION_ZU(soname,fnname) (const void* s, int c_in) \
{ \
UChar c = (UChar)c_in; \
const UChar* char_ptr = s; \
while (1) { \
if (*char_ptr == c) return (void *)char_ptr; \
char_ptr++; \
} \
}
GLIBC232_RAWMEMCHR(VG_Z_LIBC_SONAME, rawmemchr)
#if defined (VGO_linux)
GLIBC232_RAWMEMCHR(VG_Z_LIBC_SONAME, __GI___rawmemchr)
#endif
#define STRSTR(soname, fnname) \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
(const char* haystack, const char* needle); \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
(const char* haystack, const char* needle) \
{ \
const HChar* h = haystack; \
const HChar* n = needle; \
\
/* find the length of n, not including terminating zero */ \
UWord nlen = 0; \
while (n[nlen]) nlen++; \
\
/* if n is the empty string, match immediately. */ \
if (nlen == 0) return (HChar *)h; \
\
/* assert(nlen >= 1); */ \
HChar n0 = n[0]; \
\
while (1) { \
const HChar hh = *h; \
if (hh == 0) return NULL; \
if (hh != n0) { h++; continue; } \
\
UWord i; \
for (i = 0; i < nlen; i++) { \
if (n[i] != h[i]) \
break; \
} \
/* assert(i >= 0 && i <= nlen); */ \
if (i == nlen) \
return (HChar *)h; \
\
h++; \
} \
}
#if defined(VGO_linux)
STRSTR(VG_Z_LIBC_SONAME, strstr)
#endif
#define STRPBRK(soname, fnname) \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
(const char* sV, const char* acceptV); \
char* VG_REPLACE_FUNCTION_ZU(soname,fnname) \
(const char* sV, const char* acceptV) \
{ \
const HChar* s = sV; \
const HChar* accept = acceptV; \
\
/* find the length of 'accept', not including terminating zero */ \
UWord nacc = 0; \
while (accept[nacc]) nacc++; \
\
/* if n is the empty string, fail immediately. */ \
if (nacc == 0) return NULL; \
\
/* assert(nacc >= 1); */ \
while (1) { \
UWord i; \
HChar sc = *s; \
if (sc == 0) \
break; \
for (i = 0; i < nacc; i++) { \
if (sc == accept[i]) \
return (HChar *)s; \
} \
s++; \
} \
\
return NULL; \
}
#if defined(VGO_linux)
STRPBRK(VG_Z_LIBC_SONAME, strpbrk)
#endif
/*--------------------------------------------------------------------*/
/*--- end pc_intercepts.c ---*/
/*--------------------------------------------------------------------*/