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/* Miscellaneous support functions for dynamic linker
Copyright (C) 1997-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <_itoa.h>
#include <fcntl.h>
#include <ldsodefs.h>
#include <link.h>
#include <not-cancel.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
/* Read the whole contents of FILE into new mmap'd space with given
protections. *SIZEP gets the size of the file. On error MAP_FAILED
is returned. */
void *
_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
{
void *result = MAP_FAILED;
struct __stat64_t64 st;
int fd = __open64_nocancel (file, O_RDONLY | O_CLOEXEC);
if (fd >= 0)
{
if (__fstat64_time64 (fd, &st) >= 0)
{
*sizep = st.st_size;
/* No need to map the file if it is empty. */
if (*sizep != 0)
/* Map a copy of the file contents. */
result = __mmap (NULL, *sizep, prot,
#ifdef MAP_COPY
MAP_COPY
#else
MAP_PRIVATE
#endif
#ifdef MAP_FILE
| MAP_FILE
#endif
, fd, 0);
}
__close_nocancel (fd);
}
return result;
}
/* Test whether given NAME matches any of the names of the given object. */
int
_dl_name_match_p (const char *name, const struct link_map *map)
{
if (strcmp (name, map->l_name) == 0)
return 1;
struct libname_list *runp = map->l_libname;
while (runp != NULL)
if (strcmp (name, runp->name) == 0)
return 1;
else
/* Synchronize with the release MO store in add_name_to_object.
See CONCURRENCY NOTES in add_name_to_object in dl-load.c. */
runp = atomic_load_acquire (&runp->next);
return 0;
}
unsigned long int
_dl_higher_prime_number (unsigned long int n)
{
/* These are primes that are near, but slightly smaller than, a
power of two. */
static const uint32_t primes[] = {
UINT32_C (7),
UINT32_C (13),
UINT32_C (31),
UINT32_C (61),
UINT32_C (127),
UINT32_C (251),
UINT32_C (509),
UINT32_C (1021),
UINT32_C (2039),
UINT32_C (4093),
UINT32_C (8191),
UINT32_C (16381),
UINT32_C (32749),
UINT32_C (65521),
UINT32_C (131071),
UINT32_C (262139),
UINT32_C (524287),
UINT32_C (1048573),
UINT32_C (2097143),
UINT32_C (4194301),
UINT32_C (8388593),
UINT32_C (16777213),
UINT32_C (33554393),
UINT32_C (67108859),
UINT32_C (134217689),
UINT32_C (268435399),
UINT32_C (536870909),
UINT32_C (1073741789),
UINT32_C (2147483647),
/* 4294967291L */
UINT32_C (2147483647) + UINT32_C (2147483644)
};
const uint32_t *low = &primes[0];
const uint32_t *high = &primes[sizeof (primes) / sizeof (primes[0])];
while (low != high)
{
const uint32_t *mid = low + (high - low) / 2;
if (n > *mid)
low = mid + 1;
else
high = mid;
}
#if 0
/* If we've run out of primes, abort. */
if (n > *low)
{
fprintf (stderr, "Cannot find prime bigger than %lu\n", n);
abort ();
}
#endif
return *low;
}
/* A stripped down strtoul-like implementation for very early use. It
does not set errno if the result is outside bounds because it may get
called before errno may have been set up. */
uint64_t
_dl_strtoul (const char *nptr, char **endptr)
{
uint64_t result = 0;
bool positive = true;
unsigned max_digit;
while (*nptr == ' ' || *nptr == '\t')
++nptr;
if (*nptr == '-')
{
positive = false;
++nptr;
}
else if (*nptr == '+')
++nptr;
if (*nptr < '0' || *nptr > '9')
{
if (endptr != NULL)
*endptr = (char *) nptr;
return 0UL;
}
uint64_t cutoff = (UINT64_MAX * 2UL + 1UL) / 10;
uint64_t cutlim = (UINT64_MAX * 2UL + 1UL) % 10;
int base = 10;
max_digit = 9;
if (*nptr == '0')
{
if (nptr[1] == 'x' || nptr[1] == 'X')
{
base = 16;
nptr += 2;
cutoff = (UINT64_MAX * 2UL + 1UL) / 16;
cutlim = (UINT64_MAX * 2UL + 1UL) % 16;
}
else
{
base = 8;
max_digit = 7;
cutoff = (UINT64_MAX * 2UL + 1UL) / 8;
cutlim = (UINT64_MAX * 2UL + 1UL) % 8;
}
}
while (1)
{
int digval;
if (*nptr >= '0' && *nptr <= '0' + max_digit)
digval = *nptr - '0';
else if (base == 16)
{
if (*nptr >= 'a' && *nptr <= 'f')
digval = *nptr - 'a' + 10;
else if (*nptr >= 'A' && *nptr <= 'F')
digval = *nptr - 'A' + 10;
else
break;
}
else
break;
if (result > cutoff || (result == cutoff && digval > cutlim))
{
if (endptr != NULL)
*endptr = (char *) nptr;
return UINT64_MAX;
}
result *= base;
result += digval;
++nptr;
}
if (endptr != NULL)
*endptr = (char *) nptr;
/* Avoid 64-bit multiplication. */
if (!positive)
result = -result;
return result;
}
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