zenithsiz/ftmemsim-valgrind
1
0
Fork 0
mirror of https://github.com/Zenithsiz/ftmemsim-valgrind.git synced 2026-02-04 02:18:37 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
ftmemsim-valgrind/coregrind/vg_mylibc.c
Nicholas Nethercote 4e147a4eaf Added VG_(getcwd_alloc)(), which is much easier to use than VG_(getcwd)(). 
(getcwd() is really a pretty stupid syscall)


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1867
2003-09-30 13:51:23 +00:00

1700 lines
43 KiB
C
Raw Blame History

/*--------------------------------------------------------------------*/
/*--- Reimplementation of some C library stuff, to avoid depending ---*/
/*--- on libc.so. ---*/
/*--- vg_mylibc.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, an extensible x86 protected-mode
emulator for monitoring program execution on x86-Unixes.
Copyright (C) 2000-2003 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.
*/
#include "vg_include.h"
/* ---------------------------------------------------------------------
Really Actually DO system calls.
------------------------------------------------------------------ */
/* Ripped off from /usr/include/asm/unistd.h. */
static
UInt vg_do_syscall0 ( UInt syscallno )
{
UInt __res;
__asm__ volatile ("int $0x80"
: "=a" (__res)
: "0" (syscallno) );
return __res;
}
static
UInt vg_do_syscall1 ( UInt syscallno, UInt arg1 )
{
UInt __res;
__asm__ volatile ("int $0x80"
: "=a" (__res)
: "0" (syscallno),
"b" (arg1) );
return __res;
}
static
UInt vg_do_syscall2 ( UInt syscallno,
UInt arg1, UInt arg2 )
{
UInt __res;
__asm__ volatile ("int $0x80"
: "=a" (__res)
: "0" (syscallno),
"b" (arg1),
"c" (arg2) );
return __res;
}
static
UInt vg_do_syscall3 ( UInt syscallno,
UInt arg1, UInt arg2, UInt arg3 )
{
UInt __res;
__asm__ volatile ("int $0x80"
: "=a" (__res)
: "0" (syscallno),
"b" (arg1),
"c" (arg2),
"d" (arg3) );
return __res;
}
static
UInt vg_do_syscall4 ( UInt syscallno,
UInt arg1, UInt arg2, UInt arg3, UInt arg4 )
{
UInt __res;
__asm__ volatile ("int $0x80"
: "=a" (__res)
: "0" (syscallno),
"b" (arg1),
"c" (arg2),
"d" (arg3),
"S" (arg4) );
return __res;
}
#if 0
static
UInt vg_do_syscall5 ( UInt syscallno,
UInt arg1, UInt arg2, UInt arg3, UInt arg4,
UInt arg5 )
{
UInt __res;
__asm__ volatile ("int $0x80"
: "=a" (__res)
: "0" (syscallno),
"b" (arg1),
"c" (arg2),
"d" (arg3),
"S" (arg4),
"D" (arg5) );
return __res;
}
#endif
/* ---------------------------------------------------------------------
Wrappers around system calls, and other stuff, to do with signals.
------------------------------------------------------------------ */
/* sigemptyset, sigfullset, sigaddset and sigdelset return 0 on
success and -1 on error.
*/
Int VG_(ksigfillset)( vki_ksigset_t* set )
{
Int i;
if (set == NULL)
return -1;
for (i = 0; i < VKI_KNSIG_WORDS; i++)
set->ws[i] = 0xFFFFFFFF;
return 0;
}
Int VG_(ksigemptyset)( vki_ksigset_t* set )
{
Int i;
if (set == NULL)
return -1;
for (i = 0; i < VKI_KNSIG_WORDS; i++)
set->ws[i] = 0x0;
return 0;
}
Bool VG_(kisemptysigset)( vki_ksigset_t* set )
{
Int i;
vg_assert(set != NULL);
for (i = 0; i < VKI_KNSIG_WORDS; i++)
if (set->ws[i] != 0x0) return False;
return True;
}
Bool VG_(kisfullsigset)( vki_ksigset_t* set )
{
Int i;
vg_assert(set != NULL);
for (i = 0; i < VKI_KNSIG_WORDS; i++)
if (set->ws[i] != (UInt)(~0x0)) return False;
return True;
}
Int VG_(ksigaddset)( vki_ksigset_t* set, Int signum )
{
if (set == NULL)
return -1;
if (signum < 1 || signum > VKI_KNSIG)
return -1;
signum--;
set->ws[signum / VKI_KNSIG_BPW] |= (1 << (signum % VKI_KNSIG_BPW));
return 0;
}
Int VG_(ksigdelset)( vki_ksigset_t* set, Int signum )
{
if (set == NULL)
return -1;
if (signum < 1 || signum > VKI_KNSIG)
return -1;
signum--;
set->ws[signum / VKI_KNSIG_BPW] &= ~(1 << (signum % VKI_KNSIG_BPW));
return 0;
}
Int VG_(ksigismember) ( vki_ksigset_t* set, Int signum )
{
if (set == NULL)
return 0;
if (signum < 1 || signum > VKI_KNSIG)
return 0;
signum--;
if (1 & ((set->ws[signum / VKI_KNSIG_BPW]) >> (signum % VKI_KNSIG_BPW)))
return 1;
else
return 0;
}
/* Add all signals in src to dst. */
void VG_(ksigaddset_from_set)( vki_ksigset_t* dst, vki_ksigset_t* src )
{
Int i;
vg_assert(dst != NULL && src != NULL);
for (i = 0; i < VKI_KNSIG_WORDS; i++)
dst->ws[i] |= src->ws[i];
}
/* Remove all signals in src from dst. */
void VG_(ksigdelset_from_set)( vki_ksigset_t* dst, vki_ksigset_t* src )
{
Int i;
vg_assert(dst != NULL && src != NULL);
for (i = 0; i < VKI_KNSIG_WORDS; i++)
dst->ws[i] &= ~(src->ws[i]);
}
/* The functions sigaction, sigprocmask, sigpending and sigsuspend
return 0 on success and -1 on error.
*/
Int VG_(ksigprocmask)( Int how,
const vki_ksigset_t* set,
vki_ksigset_t* oldset)
{
Int res
= vg_do_syscall4(__NR_rt_sigprocmask,
how, (UInt)set, (UInt)oldset,
VKI_KNSIG_WORDS * VKI_BYTES_PER_WORD);
return VG_(is_kerror)(res) ? -1 : 0;
}
Int VG_(ksigaction) ( Int signum,
const vki_ksigaction* act,
vki_ksigaction* oldact)
{
Int res
= vg_do_syscall4(__NR_rt_sigaction,
signum, (UInt)act, (UInt)oldact,
VKI_KNSIG_WORDS * VKI_BYTES_PER_WORD);
/* VG_(printf)("res = %d\n",res); */
return VG_(is_kerror)(res) ? -1 : 0;
}
Int VG_(ksigaltstack)( const vki_kstack_t* ss, vki_kstack_t* oss )
{
Int res
= vg_do_syscall2(__NR_sigaltstack, (UInt)ss, (UInt)oss);
return VG_(is_kerror)(res) ? -1 : 0;
}
Int VG_(ksignal)(Int signum, void (*sighandler)(Int))
{
Int res;
vki_ksigaction sa;
sa.ksa_handler = sighandler;
sa.ksa_flags = VKI_SA_ONSTACK | VKI_SA_RESTART;
sa.ksa_restorer = NULL;
res = VG_(ksigemptyset)( &sa.ksa_mask );
vg_assert(res == 0);
res = vg_do_syscall4(__NR_rt_sigaction,
signum, (UInt)(&sa), (UInt)NULL,
VKI_KNSIG_WORDS * VKI_BYTES_PER_WORD);
return VG_(is_kerror)(res) ? -1 : 0;
}
Int VG_(kkill)( Int pid, Int signo )
{
Int res = vg_do_syscall2(__NR_kill, pid, signo);
return VG_(is_kerror)(res) ? -1 : 0;
}
Int VG_(ksigpending) ( vki_ksigset_t* set )
{
Int res = vg_do_syscall1(__NR_sigpending, (UInt)set);
return VG_(is_kerror)(res) ? -1 : 0;
}
/* ---------------------------------------------------------------------
mmap/munmap, exit, fcntl
------------------------------------------------------------------ */
/* Returns -1 on failure. */
void* VG_(mmap)( void* start, UInt length,
UInt prot, UInt flags, UInt fd, UInt offset)
{
Int res;
UInt args[6];
args[0] = (UInt)start;
args[1] = length;
args[2] = prot;
args[3] = flags;
args[4] = fd;
args[5] = offset;
res = vg_do_syscall1(__NR_mmap, (UInt)(&(args[0])) );
return VG_(is_kerror)(res) ? ((void*)(-1)) : (void*)res;
}
/* Returns -1 on failure. */
Int VG_(munmap)( void* start, Int length )
{
Int res = vg_do_syscall2(__NR_munmap, (UInt)start, (UInt)length );
return VG_(is_kerror)(res) ? -1 : 0;
}
void VG_(exit)( Int status )
{
(void)vg_do_syscall1(__NR_exit, (UInt)status );
/* Why are we still alive here? */
/*NOTREACHED*/
vg_assert(2+2 == 5);
}
/* Returns -1 on error. */
Int VG_(fcntl) ( Int fd, Int cmd, Int arg )
{
Int res = vg_do_syscall3(__NR_fcntl, fd, cmd, arg);
return VG_(is_kerror)(res) ? -1 : res;
}
/* Returns -1 on error. */
Int VG_(select)( Int n,
vki_fd_set* readfds,
vki_fd_set* writefds,
vki_fd_set* exceptfds,
struct vki_timeval * timeout )
{
Int res;
UInt args[5];
args[0] = n;
args[1] = (UInt)readfds;
args[2] = (UInt)writefds;
args[3] = (UInt)exceptfds;
args[4] = (UInt)timeout;
res = vg_do_syscall1(__NR_select, (UInt)(&(args[0])) );
return VG_(is_kerror)(res) ? -1 : res;
}
/* Returns -1 on error, 0 if ok, 1 if interrupted. */
Int VG_(nanosleep)( const struct vki_timespec *req,
struct vki_timespec *rem )
{
Int res;
res = vg_do_syscall2(__NR_nanosleep, (UInt)req, (UInt)rem);
if (res == -VKI_EINVAL) return -1;
if (res == -VKI_EINTR) return 1;
return 0;
}
void* VG_(brk) ( void* end_data_segment )
{
Int res;
res = vg_do_syscall1(__NR_brk, (UInt)end_data_segment);
return (void*)( VG_(is_kerror)(res) ? -1 : res );
}
/* ---------------------------------------------------------------------
printf implementation. The key function, vg_vprintf(), emits chars
into a caller-supplied function. Distantly derived from:
vprintf replacement for Checker.
Copyright 1993, 1994, 1995 Tristan Gingold
Written September 1993 Tristan Gingold
Tristan Gingold, 8 rue Parmentier, F-91120 PALAISEAU, FRANCE
(Checker itself was GPL'd.)
------------------------------------------------------------------ */
/* Some flags. */
#define VG_MSG_SIGNED 1 /* The value is signed. */
#define VG_MSG_ZJUSTIFY 2 /* Must justify with '0'. */
#define VG_MSG_LJUSTIFY 4 /* Must justify on the left. */
#define VG_MSG_PAREN 8 /* Parenthesize if present (for %y) */
/* Copy a string into the buffer. */
static UInt
myvprintf_str ( void(*send)(Char), Int flags, Int width, Char* str,
Bool capitalise )
{
# define MAYBE_TOUPPER(ch) (capitalise ? VG_(toupper)(ch) : (ch))
UInt ret = 0;
Int i, extra;
Int len = VG_(strlen)(str);
if (width == 0) {
ret += len;
for (i = 0; i < len; i++)
send(MAYBE_TOUPPER(str[i]));
return ret;
}
if (len > width) {
ret += width;
for (i = 0; i < width; i++)
send(MAYBE_TOUPPER(str[i]));
return ret;
}
extra = width - len;
if (flags & VG_MSG_LJUSTIFY) {
ret += extra;
for (i = 0; i < extra; i++)
send(' ');
}
ret += len;
for (i = 0; i < len; i++)
send(MAYBE_TOUPPER(str[i]));
if (!(flags & VG_MSG_LJUSTIFY)) {
ret += extra;
for (i = 0; i < extra; i++)
send(' ');
}
# undef MAYBE_TOUPPER
return ret;
}
/* Write P into the buffer according to these args:
* If SIGN is true, p is a signed.
* BASE is the base.
* If WITH_ZERO is true, '0' must be added.
* WIDTH is the width of the field.
*/
static UInt
myvprintf_int64 ( void(*send)(Char), Int flags, Int base, Int width, ULong p)
{
Char buf[40];
Int ind = 0;
Int i;
Bool neg = False;
Char *digits = "0123456789ABCDEF";
UInt ret = 0;
if (base < 2 || base > 16)
return ret;
if ((flags & VG_MSG_SIGNED) && (Long)p < 0) {
p = - (Long)p;
neg = True;
}
if (p == 0)
buf[ind++] = '0';
else {
while (p > 0) {
buf[ind++] = digits[p % base];
p /= base;
}
}
if (neg)
buf[ind++] = '-';
if (width > 0 && !(flags & VG_MSG_LJUSTIFY)) {
for(; ind < width; ind++) {
vg_assert(ind < 39);
buf[ind] = (flags & VG_MSG_ZJUSTIFY) ? '0': ' ';
}
}
/* Reverse copy to buffer. */
ret += ind;
for (i = ind -1; i >= 0; i--)
send(buf[i]);
if (width > 0 && (flags & VG_MSG_LJUSTIFY)) {
for(; ind < width; ind++) {
ret++;
send((flags & VG_MSG_ZJUSTIFY) ? '0': ' ');
}
}
return ret;
}
/* A simple vprintf(). */
UInt
VG_(vprintf) ( void(*send)(Char), const Char *format, va_list vargs )
{
UInt ret = 0;
int i;
int flags;
int width;
Bool is_long;
/* We assume that vargs has already been initialised by the
caller, using va_start, and that the caller will similarly
clean up with va_end.
*/
for (i = 0; format[i] != 0; i++) {
if (format[i] != '%') {
send(format[i]);
ret++;
continue;
}
i++;
/* A '%' has been found. Ignore a trailing %. */
if (format[i] == 0)
break;
if (format[i] == '%') {
/* `%%' is replaced by `%'. */
send('%');
ret++;
continue;
}
flags = 0;
is_long = False;
width = 0; /* length of the field. */
if (format[i] == '(') {
flags |= VG_MSG_PAREN;
i++;
}
/* If '-' follows '%', justify on the left. */
if (format[i] == '-') {
flags |= VG_MSG_LJUSTIFY;
i++;
}
/* If '0' follows '%', pads will be inserted. */
if (format[i] == '0') {
flags |= VG_MSG_ZJUSTIFY;
i++;
}
/* Compute the field length. */
while (format[i] >= '0' && format[i] <= '9') {
width *= 10;
width += format[i++] - '0';
}
while (format[i] == 'l') {
i++;
is_long = True;
}
switch (format[i]) {
case 'd': /* %d */
flags |= VG_MSG_SIGNED;
if (is_long)
ret += myvprintf_int64(send, flags, 10, width,
(ULong)(va_arg (vargs, Long)));
else
ret += myvprintf_int64(send, flags, 10, width,
(ULong)(va_arg (vargs, Int)));
break;
case 'u': /* %u */
if (is_long)
ret += myvprintf_int64(send, flags, 10, width,
(ULong)(va_arg (vargs, ULong)));
else
ret += myvprintf_int64(send, flags, 10, width,
(ULong)(va_arg (vargs, UInt)));
break;
case 'p': /* %p */
ret += 2;
send('0');
send('x');
ret += myvprintf_int64(send, flags, 16, width,
(ULong)((UInt)va_arg (vargs, void *)));
break;
case 'x': /* %x */
if (is_long)
ret += myvprintf_int64(send, flags, 16, width,
(ULong)(va_arg (vargs, ULong)));
else
ret += myvprintf_int64(send, flags, 16, width,
(ULong)(va_arg (vargs, UInt)));
break;
case 'c': /* %c */
ret++;
send(va_arg (vargs, int));
break;
case 's': case 'S': { /* %s */
char *str = va_arg (vargs, char *);
if (str == (char*) 0) str = "(null)";
ret += myvprintf_str(send, flags, width, str, format[i]=='S');
break;
}
case 'y': { /* %y - print symbol */
Char buf[100];
Char *cp = buf;
Addr a = va_arg(vargs, Addr);
if (flags & VG_MSG_PAREN)
*cp++ = '(';
if (VG_(get_fnname_w_offset)(a, cp, sizeof(buf)-4)) {
if (flags & VG_MSG_PAREN) {
cp += VG_(strlen)(cp);
*cp++ = ')';
*cp = '\0';
}
ret += myvprintf_str(send, flags, width, buf, 0);
}
break;
}
default:
break;
}
}
return ret;
}
/* A general replacement for printf(). Note that only low-level
debugging info should be sent via here. The official route is to
to use vg_message(). This interface is deprecated.
*/
static char myprintf_buf[100];
static int n_myprintf_buf;
static void add_to_myprintf_buf ( Char c )
{
if (n_myprintf_buf >= 100-10 /*paranoia*/ ) {
if (VG_(clo_logfile_fd) >= 0) {
VG_(send_bytes_to_logging_sink)(
myprintf_buf, VG_(strlen)(myprintf_buf) );
}
n_myprintf_buf = 0;
myprintf_buf[n_myprintf_buf] = 0;
}
myprintf_buf[n_myprintf_buf++] = c;
myprintf_buf[n_myprintf_buf] = 0;
}
UInt VG_(printf) ( const char *format, ... )
{
UInt ret;
va_list vargs;
va_start(vargs,format);
n_myprintf_buf = 0;
myprintf_buf[n_myprintf_buf] = 0;
ret = VG_(vprintf) ( add_to_myprintf_buf, format, vargs );
if (n_myprintf_buf > 0 && VG_(clo_logfile_fd) >= 0) {
VG_(send_bytes_to_logging_sink)( myprintf_buf, n_myprintf_buf );
}
va_end(vargs);
return ret;
}
/* A general replacement for sprintf(). */
UInt VG_(sprintf) ( Char* buf, Char *format, ... )
{
Int ret;
va_list vargs;
Char *ptr = buf;
static void add_to_vg_sprintf_buf ( Char c )
{
*ptr++ = c;
}
va_start(vargs,format);
ret = VG_(vprintf) ( add_to_vg_sprintf_buf, format, vargs );
add_to_vg_sprintf_buf(0);
va_end(vargs);
vg_assert(VG_(strlen)(buf) == ret);
return ret;
}
/* ---------------------------------------------------------------------
Misc str* functions.
------------------------------------------------------------------ */
Bool VG_(isspace) ( Char c )
{
return (c == ' ' || c == '\n' || c == '\t' || c == 0);
}
Bool VG_(isdigit) ( Char c )
{
return (c >= '0' && c <= '9');
}
Int VG_(strlen) ( const Char* str )
{
Int i = 0;
while (str[i] != 0) i++;
return i;
}
Long VG_(atoll) ( Char* str )
{
Bool neg = False;
Long n = 0;
if (*str == '-') { str++; neg = True; };
while (*str >= '0' && *str <= '9') {
n = 10*n + (Long)(*str - '0');
str++;
}
if (neg) n = -n;
return n;
}
Long VG_(atoll16) ( Char* str )
{
Bool neg = False;
Long n = 0;
if (*str == '-') { str++; neg = True; };
while (True) {
if (*str >= '0' && *str <= '9') {
n = 16*n + (Long)(*str - '0');
}
else
if (*str >= 'A' && *str <= 'F') {
n = 16*n + (Long)((*str - 'A') + 10);
}
else
if (*str >= 'a' && *str <= 'f') {
n = 16*n + (Long)((*str - 'a') + 10);
}
else {
break;
}
str++;
}
if (neg) n = -n;
return n;
}
Long VG_(atoll36) ( UInt base, Char* str )
{
Bool neg = False;
Long n = 0;
vg_assert(base >= 2 && base <= 36);
if (*str == '-') { str++; neg = True; };
while (True) {
if (*str >= '0'
&& *str <= (Char)('9' - (10 - base))) {
n = base*n + (Long)(*str - '0');
}
else
if (base > 10 && *str >= 'A'
&& *str <= (Char)('Z' - (36 - base))) {
n = base*n + (Long)((*str - 'A') + 10);
}
else
if (base > 10 && *str >= 'a'
&& *str <= (Char)('z' - (36 - base))) {
n = base*n + (Long)((*str - 'a') + 10);
}
else {
break;
}
str++;
}
if (neg) n = -n;
return n;
}
Char* VG_(strcat) ( Char* dest, const Char* src )
{
Char* dest_orig = dest;
while (*dest) dest++;
while (*src) *dest++ = *src++;
*dest = 0;
return dest_orig;
}
Char* VG_(strncat) ( Char* dest, const Char* src, Int n )
{
Char* dest_orig = dest;
while (*dest) dest++;
while (*src && n > 0) { *dest++ = *src++; n--; }
*dest = 0;
return dest_orig;
}
Char* VG_(strpbrk) ( const Char* s, const Char* accept )
{
const Char* a;
while (*s) {
a = accept;
while (*a)
if (*a++ == *s)
return (Char *) s;
s++;
}
return NULL;
}
Char* VG_(strcpy) ( Char* dest, const Char* src )
{
Char* dest_orig = dest;
while (*src) *dest++ = *src++;
*dest = 0;
return dest_orig;
}
/* Copy bytes, not overrunning the end of dest and always ensuring
zero termination. */
void VG_(strncpy_safely) ( Char* dest, const Char* src, Int ndest )
{
Int i;
vg_assert(ndest > 0);
i = 0;
dest[i] = 0;
while (True) {
if (src[i] == 0) return;
if (i >= ndest-1) return;
dest[i] = src[i];
i++;
dest[i] = 0;
}
}
Char* VG_(strncpy) ( Char* dest, const Char* src, Int ndest )
{
Int i = 0;
while (True) {
if (i >= ndest) return dest; /* reached limit */
dest[i] = src[i];
if (src[i++] == 0) {
/* reached NUL; pad rest with zeroes as required */
while (i < ndest) dest[i++] = 0;
return dest;
}
}
}
Int VG_(strcmp) ( const Char* s1, const Char* s2 )
{
while (True) {
if (*s1 == 0 && *s2 == 0) return 0;
if (*s1 == 0) return -1;
if (*s2 == 0) return 1;
if (*(UChar*)s1 < *(UChar*)s2) return -1;
if (*(UChar*)s1 > *(UChar*)s2) return 1;
s1++; s2++;
}
}
Int VG_(strcmp_ws) ( const Char* s1, const Char* s2 )
{
while (True) {
if (VG_(isspace)(*s1) && VG_(isspace)(*s2)) return 0;
if (VG_(isspace)(*s1)) return -1;
if (VG_(isspace)(*s2)) return 1;
if (*(UChar*)s1 < *(UChar*)s2) return -1;
if (*(UChar*)s1 > *(UChar*)s2) return 1;
s1++; s2++;
}
}
Int VG_(strncmp) ( const Char* s1, const Char* s2, Int nmax )
{
Int 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 (*(UChar*)s1 < *(UChar*)s2) return -1;
if (*(UChar*)s1 > *(UChar*)s2) return 1;
s1++; s2++; n++;
}
}
Int VG_(strncmp_ws) ( const Char* s1, const Char* s2, Int nmax )
{
Int n = 0;
while (True) {
if (n >= nmax) return 0;
if (VG_(isspace)(*s1) && VG_(isspace)(*s2)) return 0;
if (VG_(isspace)(*s1)) return -1;
if (VG_(isspace)(*s2)) return 1;
if (*(UChar*)s1 < *(UChar*)s2) return -1;
if (*(UChar*)s1 > *(UChar*)s2) return 1;
s1++; s2++; n++;
}
}
Char* VG_(strstr) ( const Char* haystack, Char* needle )
{
Int n;
if (haystack == NULL)
return NULL;
n = VG_(strlen)(needle);
while (True) {
if (haystack[0] == 0)
return NULL;
if (VG_(strncmp)(haystack, needle, n) == 0)
return (Char*)haystack;
haystack++;
}
}
Char* VG_(strchr) ( const Char* s, Char c )
{
while (True) {
if (*s == c) return (Char*)s;
if (*s == 0) return NULL;
s++;
}
}
void* VG_(memcpy) ( void *dest, const void *src, Int sz )
{
const Char *s = (const Char *)src;
Char *d = (Char *)dest;
vg_assert(sz >= 0);
while (sz--)
*d++ = *s++;
return dest;
}
void* VG_(memset) ( void *dest, Int c, Int sz )
{
Char *d = (Char *)dest;
vg_assert(sz >= 0);
while (sz--)
*d++ = c;
return dest;
}
Int VG_(memcmp) ( const void* s1, const void* s2, Int n )
{
Int res;
UChar a0;
UChar b0;
vg_assert(n >= 0);
while (n != 0) {
a0 = ((UChar *) s1)[0];
b0 = ((UChar *) s2)[0];
s1 += 1;
s2 += 1;
res = a0 - b0;
if (res != 0)
return res;
n -= 1;
}
return 0;
}
Char VG_(toupper) ( Char c )
{
if (c >= 'a' && c <= 'z')
return c + ('A' - 'a');
else
return c;
}
/* Inline just for the wrapper VG_(strdup) below */
__inline__ Char* VG_(arena_strdup) ( ArenaId aid, const Char* s )
{
Int i;
Int len = VG_(strlen)(s) + 1;
Char* res = VG_(arena_malloc) (aid, len);
for (i = 0; i < len; i++)
res[i] = s[i];
return res;
}
/* Wrapper to avoid exposing skins to ArenaId's */
Char* VG_(strdup) ( const Char* s )
{
return VG_(arena_strdup) ( VG_AR_SKIN, s );
}
/* ---------------------------------------------------------------------
A simple string matching routine, purloined from Hugs98.
`*' matches any sequence of zero or more characters
`?' matches any single character exactly
`\c' matches the character c only (ignoring special chars)
c matches the character c only
------------------------------------------------------------------ */
/* Keep track of recursion depth. */
static Int recDepth;
static Bool string_match_wrk ( Char* pat, Char* str )
{
vg_assert(recDepth >= 0 && recDepth < 500);
recDepth++;
for (;;) {
switch (*pat) {
case '\0' : return (*str=='\0');
case '*' : do {
if (string_match_wrk(pat+1,str)) {
recDepth--;
return True;
}
} while (*str++);
recDepth--;
return False;
case '?' : if (*str++=='\0') {
recDepth--;
return False;
}
pat++;
break;
case '\\' : if (*++pat == '\0') {
recDepth--;
return False; /* spurious trailing \ in pattern */
}
/* falls through to ... */
default : if (*pat++ != *str++) {
recDepth--;
return False;
}
break;
}
}
}
Bool VG_(string_match) ( Char* pat, Char* str )
{
Bool b;
recDepth = 0;
b = string_match_wrk ( pat, str );
/*
VG_(printf)("%s %s %s\n",
b?"TRUE ":"FALSE", pat, str);
*/
return b;
}
/* ---------------------------------------------------------------------
Assertery.
------------------------------------------------------------------ */
__attribute__ ((noreturn))
static void report_and_quit ( const Char* report )
{
VG_(pp_sched_status)();
VG_(printf)("\n");
VG_(printf)("Note: see also the FAQ.txt in the source distribution.\n");
VG_(printf)("It contains workarounds to several common problems.\n");
VG_(printf)("\n");
VG_(printf)("If that doesn't help, please report this bug to: %s\n\n",
report);
VG_(printf)("In the bug report, send all the above text, the valgrind\n");
VG_(printf)("version, and what Linux distro you are using. Thanks.\n\n");
VG_(shutdown_logging)();
VG_(exit)(1);
}
__attribute__ ((noreturn))
static void assert_fail ( const Char* expr, const Char* name, const Char* report,
const Char* file, Int line, const Char* fn )
{
static Bool entered = False;
if (entered)
VG_(exit)(2);
entered = True;
VG_(printf)("\n%s: %s:%d (%s): Assertion `%s' failed.\n",
name, file, line, fn, expr );
report_and_quit(report);
}
void VG_(skin_assert_fail) ( const Char* expr, const Char* file, Int line, const Char* fn )
{
assert_fail(expr, VG_(details).name, VG_(details).bug_reports_to,
file, line, fn);
}
void VG_(core_assert_fail) ( const Char* expr, const Char* file, Int line, const Char* fn )
{
assert_fail(expr, "valgrind", VG_EMAIL_ADDR, file, line, fn);
}
__attribute__ ((noreturn))
static void panic ( Char* name, Char* report, Char* str )
{
VG_(printf)("\n%s: the `impossible' happened:\n %s\n", name, str);
VG_(printf)("Basic block ctr is approximately %llu\n", VG_(bbs_done) );
report_and_quit(report);
}
void VG_(core_panic) ( Char* str )
{
panic("valgrind", VG_EMAIL_ADDR, str);
}
void VG_(skin_panic) ( Char* str )
{
panic(VG_(details).name, VG_(details).bug_reports_to, str);
}
/* ---------------------------------------------------------------------
Primitive support for reading files.
------------------------------------------------------------------ */
/* Returns -1 on failure. */
Int VG_(open) ( const Char* pathname, Int flags, Int mode )
{
Int fd;
/* (old comment, not sure if it still applies NJN 2002-sep-09) */
/* This gets a segmentation fault if pathname isn't a valid file.
I don't know why. It seems like the call to open is getting
intercepted and messed with by glibc ... */
/* fd = open( pathname, O_RDONLY ); */
/* ... so we go direct to the horse's mouth, which seems to work
ok: */
fd = vg_do_syscall3(__NR_open, (UInt)pathname, flags, mode);
/* VG_(printf)("result = %d\n", fd); */
if (VG_(is_kerror)(fd)) fd = -1;
return fd;
}
void VG_(close) ( Int fd )
{
vg_do_syscall1(__NR_close, fd);
}
Int VG_(read) ( Int fd, void* buf, Int count)
{
Int res;
/* res = read( fd, buf, count ); */
res = vg_do_syscall3(__NR_read, fd, (UInt)buf, count);
if (VG_(is_kerror)(res)) res = -1;
return res;
}
Int VG_(write) ( Int fd, void* buf, Int count)
{
Int res;
/* res = write( fd, buf, count ); */
res = vg_do_syscall3(__NR_write, fd, (UInt)buf, count);
if (VG_(is_kerror)(res)) res = -1;
return res;
}
Int VG_(stat) ( Char* file_name, struct vki_stat* buf )
{
Int res;
res = vg_do_syscall2(__NR_stat, (UInt)file_name, (UInt)buf);
return VG_(is_kerror)(res) ? (-1) : 0;
}
Int VG_(rename) ( Char* old_name, Char* new_name )
{
Int res;
res = vg_do_syscall2(__NR_rename, (UInt)old_name, (UInt)new_name);
return VG_(is_kerror)(res) ? (-1) : 0;
}
Int VG_(unlink) ( Char* file_name )
{
Int res;
res = vg_do_syscall1(__NR_unlink, (UInt)file_name);
return VG_(is_kerror)(res) ? (-1) : 0;
}
/* Nb: we do not allow the Linux extension which malloc()s memory for the
buffer if buf==NULL, because we don't want Linux calling malloc() */
Char* VG_(getcwd) ( Char* buf, Int size )
{
Int res;
vg_assert(buf != NULL);
res = vg_do_syscall2(__NR_getcwd, (UInt)buf, (UInt)size);
return VG_(is_kerror)(res) ? ((Char*)NULL) : (Char*)res;
}
/* Alternative version that does allocate the memory. Easier to use. */
Bool VG_(getcwd_alloc) ( Char** out )
{
UInt size = 4;
*out = NULL;
while (True) {
*out = VG_(malloc)(size);
if (NULL == VG_(getcwd)(*out, size)) {
VG_(free)(*out);
if (size > 65535)
return False;
size *= 2;
} else {
return True;
}
}
}
/* ---------------------------------------------------------------------
Misc functions looking for a proper home.
------------------------------------------------------------------ */
/* We do getenv without libc's help by snooping around in
VG_(client_envp) as determined at startup time. */
Char* VG_(getenv) ( Char* varname )
{
Int i, n;
n = VG_(strlen)(varname);
for (i = 0; VG_(client_envp)[i] != NULL; i++) {
Char* s = VG_(client_envp)[i];
if (VG_(strncmp)(varname, s, n) == 0 && s[n] == '=') {
return & s[n+1];
}
}
return NULL;
}
/* You'd be amazed how many places need to know the current pid. */
Int VG_(getpid) ( void )
{
Int res;
/* res = getpid(); */
res = vg_do_syscall0(__NR_getpid);
return res;
}
Int VG_(getppid) ( void )
{
Int res;
res = vg_do_syscall0(__NR_getppid);
return res;
}
/* Return -1 if error, else 0. NOTE does not indicate return code of
child! */
Int VG_(system) ( Char* cmd )
{
Int pid, res;
void* environ[1] = { NULL };
if (cmd == NULL)
return 1;
pid = vg_do_syscall0(__NR_fork);
if (VG_(is_kerror)(pid))
return -1;
if (pid == 0) {
/* child */
Char* argv[4];
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = cmd;
argv[3] = 0;
(void)vg_do_syscall3(__NR_execve,
(UInt)"/bin/sh", (UInt)argv, (UInt)&environ);
/* If we're still alive here, execve failed. */
return -1;
} else {
/* parent */
res = vg_do_syscall3(__NR_waitpid, pid, (UInt)NULL, 0);
if (VG_(is_kerror)(res)) {
return -1;
} else {
return 0;
}
}
}
/* ---------------------------------------------------------------------
Support for a millisecond-granularity counter using RDTSC.
------------------------------------------------------------------ */
static __inline__ ULong do_rdtsc_insn ( void )
{
ULong x;
__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
return x;
}
/* 0 = pre-calibration, 1 = calibration, 2 = running */
static Int rdtsc_calibration_state = 0;
static ULong rdtsc_ticks_per_millisecond = 0; /* invalid value */
static struct vki_timeval rdtsc_cal_start_timeval;
static struct vki_timeval rdtsc_cal_end_timeval;
static ULong rdtsc_cal_start_raw;
static ULong rdtsc_cal_end_raw;
UInt VG_(read_millisecond_timer) ( void )
{
ULong rdtsc_now;
vg_assert(rdtsc_calibration_state == 2);
rdtsc_now = do_rdtsc_insn();
vg_assert(rdtsc_now > rdtsc_cal_end_raw);
rdtsc_now -= rdtsc_cal_end_raw;
rdtsc_now /= rdtsc_ticks_per_millisecond;
return (UInt)rdtsc_now;
}
void VG_(start_rdtsc_calibration) ( void )
{
Int res;
vg_assert(rdtsc_calibration_state == 0);
rdtsc_calibration_state = 1;
rdtsc_cal_start_raw = do_rdtsc_insn();
res = vg_do_syscall2(__NR_gettimeofday, (UInt)&rdtsc_cal_start_timeval,
(UInt)NULL);
vg_assert(!VG_(is_kerror)(res));
}
void VG_(end_rdtsc_calibration) ( void )
{
Int res, loops;
ULong cpu_clock_MHZ;
ULong cal_clock_ticks;
ULong cal_wallclock_microseconds;
ULong wallclock_start_microseconds;
ULong wallclock_end_microseconds;
struct vki_timespec req;
struct vki_timespec rem;
vg_assert(rdtsc_calibration_state == 1);
rdtsc_calibration_state = 2;
/* Try and delay for 20 milliseconds, so that we can at least have
some minimum level of accuracy. */
req.tv_sec = 0;
req.tv_nsec = 20 * 1000 * 1000;
loops = 0;
while (True) {
res = VG_(nanosleep)(&req, &rem);
vg_assert(res == 0 /*ok*/ || res == 1 /*interrupted*/);
if (res == 0)
break;
if (rem.tv_sec == 0 && rem.tv_nsec == 0)
break;
req = rem;
loops++;
if (loops > 100)
VG_(core_panic)("calibration nanosleep loop failed?!");
}
/* Now read both timers, and do the Math. */
rdtsc_cal_end_raw = do_rdtsc_insn();
res = vg_do_syscall2(__NR_gettimeofday, (UInt)&rdtsc_cal_end_timeval,
(UInt)NULL);
vg_assert(rdtsc_cal_end_raw > rdtsc_cal_start_raw);
cal_clock_ticks = rdtsc_cal_end_raw - rdtsc_cal_start_raw;
wallclock_start_microseconds
= (1000000ULL * (ULong)(rdtsc_cal_start_timeval.tv_sec))
+ (ULong)(rdtsc_cal_start_timeval.tv_usec);
wallclock_end_microseconds
= (1000000ULL * (ULong)(rdtsc_cal_end_timeval.tv_sec))
+ (ULong)(rdtsc_cal_end_timeval.tv_usec);
vg_assert(wallclock_end_microseconds > wallclock_start_microseconds);
cal_wallclock_microseconds
= wallclock_end_microseconds - wallclock_start_microseconds;
/* Since we just nanoslept for 20 ms ... */
vg_assert(cal_wallclock_microseconds >= 20000);
/* Now we know (roughly) that cal_clock_ticks on RDTSC take
cal_wallclock_microseconds elapsed time. Calculate the RDTSC
ticks-per-millisecond value. */
if (0)
VG_(printf)("%lld ticks in %lld microseconds\n",
cal_clock_ticks, cal_wallclock_microseconds );
rdtsc_ticks_per_millisecond
= cal_clock_ticks / (cal_wallclock_microseconds / 1000ULL);
cpu_clock_MHZ
= (1000ULL * rdtsc_ticks_per_millisecond) / 1000000ULL;
if (VG_(clo_verbosity) >= 1)
VG_(message)(Vg_UserMsg, "Estimated CPU clock rate is %d MHz",
(UInt)cpu_clock_MHZ);
if (cpu_clock_MHZ < 50 || cpu_clock_MHZ > 10000)
VG_(core_panic)("end_rdtsc_calibration: "
"estimated CPU MHz outside range 50 .. 10000");
/* Paranoia about division by zero later. */
vg_assert(rdtsc_ticks_per_millisecond != 0);
if (0)
VG_(printf)("ticks per millisecond %llu\n",
rdtsc_ticks_per_millisecond);
}
/* ---------------------------------------------------------------------
Primitive support for bagging memory via mmap.
------------------------------------------------------------------ */
void* VG_(get_memory_from_mmap) ( Int nBytes, Char* who )
{
static UInt tot_alloc = 0;
void* p;
p = VG_(mmap)( 0, nBytes,
VKI_PROT_READ|VKI_PROT_WRITE|VKI_PROT_EXEC,
VKI_MAP_PRIVATE|VKI_MAP_ANONYMOUS, -1, 0 );
if (p != ((void*)(-1))) {
tot_alloc += (UInt)nBytes;
if (0)
VG_(printf)(
"get_memory_from_mmap: %d tot, %d req = %p .. %p, caller %s\n",
tot_alloc, nBytes, p, ((char*)p) + nBytes - 1, who );
return p;
}
VG_(printf)("\n");
VG_(printf)("VG_(get_memory_from_mmap): %s's request for %d bytes failed.\n",
who, nBytes);
VG_(printf)("VG_(get_memory_from_mmap): %d bytes already allocated.\n",
tot_alloc);
VG_(printf)("\n");
VG_(printf)("This may mean that you have run out of swap space,\n");
VG_(printf)("since running programs on valgrind increases their memory\n");
VG_(printf)("usage at least 3 times. You might want to use 'top'\n");
VG_(printf)("to determine whether you really have run out of swap.\n");
VG_(printf)("If so, you may be able to work around it by adding a\n");
VG_(printf)("temporary swap file -- this is easier than finding a\n");
VG_(printf)("new swap partition. Go ask your sysadmin(s) [politely!]\n");
VG_(printf)("\n");
VG_(printf)("VG_(get_memory_from_mmap): out of memory! Fatal! Bye!\n");
VG_(printf)("\n");
VG_(exit)(1);
}
/* ---------------------------------------------------------------------
Generally useful...
------------------------------------------------------------------ */
Int VG_(log2) ( Int x )
{
Int i;
/* Any more than 32 and we overflow anyway... */
for (i = 0; i < 32; i++) {
if (1 << i == x) return i;
}
return -1;
}
/* ---------------------------------------------------------------------
Gruesome hackery for connecting to a logging server over the network.
This is all very Linux-kernel specific.
------------------------------------------------------------------ */
/* Various needed constants from the kernel iface (2.4),
/usr/src/linux-2.4.9-31 */
/* kernel, ./include/linux/net.h */
#define SYS_SOCKET 1 /* sys_socket(2) */
#define SYS_CONNECT 3 /* sys_connect(2) */
#define SYS_SEND 9 /* sys_send(2) */
typedef UInt __u32;
/* Internet address. */
struct vki_in_addr {
__u32 s_addr;
};
/* kernel, include/linux/socket.h */
typedef unsigned short vki_sa_family_t;
#define AF_INET 2 /* Internet IP Protocol */
#define MSG_NOSIGNAL 0x4000 /* Do not generate SIGPIPE */
/* kernel, ./include/asm-i386/socket.h */
#define SOCK_STREAM 1 /* stream (connection) socket */
/* kernel, /usr/src/linux-2.4.9-31/linux/include/in.h */
/* Structure describing an Internet (IP) socket address. */
#define __SOCK_SIZE__ 16 /* sizeof(struct sockaddr) */
struct vki_sockaddr_in {
vki_sa_family_t sin_family; /* Address family */
unsigned short int sin_port; /* Port number */
struct vki_in_addr sin_addr; /* Internet address */
/* Pad to size of `struct sockaddr'. */
unsigned char __pad[__SOCK_SIZE__ - sizeof(short int) -
sizeof(unsigned short int) -
sizeof(struct vki_in_addr)];
};
static
Int parse_inet_addr_and_port ( UChar* str, UInt* ip_addr, UShort* port );
static
Int my_socket ( Int domain, Int type, Int protocol );
static
Int my_connect ( Int sockfd, struct vki_sockaddr_in* serv_addr,
Int addrlen );
static
UInt my_htonl ( UInt x )
{
return
(((x >> 24) & 0xFF) << 0) | (((x >> 16) & 0xFF) << 8)
| (((x >> 8) & 0xFF) << 16) | (((x >> 0) & 0xFF) << 24);
}
static
UShort my_htons ( UShort x )
{
return
(((x >> 8) & 0xFF) << 0) | (((x >> 0) & 0xFF) << 8);
}
/* The main function.
Supplied string contains either an ip address "192.168.0.1" or
an ip address and port pair, "192.168.0.1:1500". Parse these,
and return:
-1 if there is a parse error
-2 if no parse error, but specified host:port cannot be opened
the relevant file (socket) descriptor, otherwise.
is used.
*/
Int VG_(connect_via_socket)( UChar* str )
{
Int sd, res;
struct vki_sockaddr_in servAddr;
UInt ip = 0;
UShort port = VG_CLO_DEFAULT_LOGPORT;
Bool ok = parse_inet_addr_and_port(str, &ip, &port);
if (!ok)
return -1;
if (0)
VG_(printf)("ip = %d.%d.%d.%d, port %d\n",
(ip >> 24) & 0xFF, (ip >> 16) & 0xFF,
(ip >> 8) & 0xFF, ip & 0xFF,
(UInt)port );
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = my_htonl(ip);
servAddr.sin_port = my_htons(port);
/* create socket */
sd = my_socket(AF_INET, SOCK_STREAM, 0 /* IPPROTO_IP ? */);
if (sd < 0) {
/* this shouldn't happen ... nevertheless */
return -2;
}
/* connect to server */
res = my_connect(sd, (struct vki_sockaddr_in *) &servAddr,
sizeof(servAddr));
if (res < 0) {
/* connection failed */
return -2;
}
return sd;
}
/* Let d = one or more digits. Accept either:
d.d.d.d or d.d.d.d:d
*/
Int parse_inet_addr_and_port ( UChar* str, UInt* ip_addr, UShort* port )
{
# define GET_CH ((*str) ? (*str++) : 0)
UInt ipa, i, j, c, any;
ipa = 0;
for (i = 0; i < 4; i++) {
j = 0;
any = 0;
while (1) {
c = GET_CH;
if (c < '0' || c > '9') break;
j = 10 * j + (int)(c - '0');
any = 1;
}
if (any == 0 || j > 255) goto syntaxerr;
ipa = (ipa << 8) + j;
if (i <= 2 && c != '.') goto syntaxerr;
}
if (c == 0 || c == ':')
*ip_addr = ipa;
if (c == 0) goto ok;
if (c != ':') goto syntaxerr;
j = 0;
any = 0;
while (1) {
c = GET_CH;
if (c < '0' || c > '9') break;
j = j * 10 + (int)(c - '0');
any = 1;
if (j > 65535) goto syntaxerr;
}
if (any == 0 || c != 0) goto syntaxerr;
if (j < 1024) goto syntaxerr;
*port = (UShort)j;
ok:
return 1;
syntaxerr:
return 0;
# undef GET_CH
}
static
Int my_socket ( Int domain, Int type, Int protocol )
{
Int res;
UInt args[3];
args[0] = domain;
args[1] = type;
args[2] = protocol;
res = vg_do_syscall2(__NR_socketcall, SYS_SOCKET, (UInt)&args);
if (VG_(is_kerror)(res))
res = -1;
return res;
}
static
Int my_connect ( Int sockfd, struct vki_sockaddr_in* serv_addr,
Int addrlen )
{
Int res;
UInt args[3];
args[0] = sockfd;
args[1] = (UInt)serv_addr;
args[2] = addrlen;
res = vg_do_syscall2(__NR_socketcall, SYS_CONNECT, (UInt)&args);
if (VG_(is_kerror)(res))
res = -1;
return res;
}
Int VG_(write_socket)( Int sd, void *msg, Int count )
{
/* This is actually send(). */
/* Requests not to send SIGPIPE on errors on stream oriented
sockets when the other end breaks the connection. The EPIPE
error is still returned. */
Int flags = MSG_NOSIGNAL;
Int res;
UInt args[4];
args[0] = sd;
args[1] = (UInt)msg;
args[2] = count;
args[3] = flags;
res = vg_do_syscall2(__NR_socketcall, SYS_SEND, (UInt)&args);
if (VG_(is_kerror)(res))
res = -1;
return res;
}
/*--------------------------------------------------------------------*/
/*--- end vg_mylibc.c ---*/
/*--------------------------------------------------------------------*/
Reference in New Issue View Git Blame Copy Permalink