/* Minimal replacements for basic facilities used in the dynamic linker. Copyright (C) 1995,96,97,98,2000,2001 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <limits.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/mman.h> #include <ldsodefs.h> #include <machine/weakalias.h> #include <assert.h> /* Minimal `malloc' allocator for use while loading shared libraries. No block is ever freed. */ static void *alloc_ptr, *alloc_end, *alloc_last_block; /* Declarations of global functions. */ extern void weak_function free (void *ptr); extern void * weak_function realloc (void *ptr, size_t n); extern unsigned long int weak_function __strtoul_internal (const char *nptr, char **endptr, int base, int group); extern unsigned long int weak_function strtoul (const char *nptr, char **endptr, int base); void * weak_function malloc (size_t n) { #ifdef MAP_ANON #define _dl_zerofd (-1) #else extern int _dl_zerofd; if (_dl_zerofd == -1) _dl_zerofd = _dl_sysdep_open_zero_fill (); #define MAP_ANON 0 #endif if (alloc_end == 0) { /* Consume any unused space in the last page of our data segment. */ extern int _end; alloc_ptr = &_end; alloc_end = (void *) 0 + (((alloc_ptr - (void *) 0) + _dl_pagesize - 1) & ~(_dl_pagesize - 1)); } /* Make sure the allocation pointer is ideally aligned. */ alloc_ptr = (void *) 0 + (((alloc_ptr - (void *) 0) + sizeof (double) - 1) & ~(sizeof (double) - 1)); if (alloc_ptr + n >= alloc_end) { /* Insufficient space left; allocate another page. */ caddr_t page; size_t nup = (n + _dl_pagesize - 1) & ~(_dl_pagesize - 1); page = __mmap (0, nup, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, _dl_zerofd, 0); assert (page != MAP_FAILED); if (page != alloc_end) alloc_ptr = page; alloc_end = page + nup; } alloc_last_block = (void *) alloc_ptr; alloc_ptr += n; return alloc_last_block; } /* We use this function occasionally since the real implementation may be optimized when it can assume the memory it returns already is set to NUL. */ void * weak_function calloc (size_t nmemb, size_t size) { size_t total = nmemb * size; void *result = malloc (total); return memset (result, '\0', total); } /* This will rarely be called. */ void weak_function free (void *ptr) { /* We can free only the last block allocated. */ if (ptr == alloc_last_block) alloc_ptr = alloc_last_block; } /* This is only called with the most recent block returned by malloc. */ void * weak_function realloc (void *ptr, size_t n) { void *new; if (ptr == NULL) return malloc (n); assert (ptr == alloc_last_block); alloc_ptr = alloc_last_block; new = malloc (n); assert (new == ptr); return new; } /* Define our own version of the internal function used by strerror. We only provide the messages for some common errors. This avoids pulling in the whole error list. */ char * weak_function __strerror_r (int errnum, char *buf, size_t buflen) { char *msg; switch (errnum) { case ENOMEM: msg = (char *) "Cannot allocate memory"; break; case EINVAL: msg = (char *) "Invalid argument"; break; case ENOENT: msg = (char *) "No such file or directory"; break; case EPERM: msg = (char *) "Operation not permitted"; break; case EIO: msg = (char *) "Input/output error"; break; case EACCES: msg = (char *) "Permission denied"; break; default: /* No need to check buffer size, all calls in the dynamic linker provide enough space. */ msg = (char *) "Error"; break; } return msg; } #ifndef NDEBUG /* Define (weakly) our own assert failure function which doesn't use stdio. If we are linked into the user program (-ldl), the normal __assert_fail defn can override this one. */ void weak_function __assert_fail (const char *assertion, const char *file, unsigned int line, const char *function) { _dl_fatal_printf ("\ Inconsistency detected by ld.so: %s: %u: %s%sAssertion `%s' failed!\n", file, line, function ?: "", function ? ": " : "", assertion); } void weak_function __assert_perror_fail (int errnum, const char *file, unsigned int line, const char *function) { char errbuf[64]; _dl_fatal_printf ("\ Inconsistency detected by ld.so: %s: %u: %s%sUnexpected error: %s\n", file, line, function ?: "", function ? ": " : "", __strerror_r (errnum, errbuf, sizeof (errbuf))); } #endif unsigned long int weak_function __strtoul_internal (const char *nptr, char **endptr, int base, int group) { unsigned long int result = 0; long int sign = 1; while (*nptr == ' ' || *nptr == '\t') ++nptr; if (*nptr == '-') { sign = -1; ++nptr; } else if (*nptr == '+') ++nptr; if (*nptr < '0' || *nptr > '9') { if (endptr != NULL) *endptr = (char *) nptr; return 0UL; } assert (base == 0); base = 10; if (*nptr == '0') { if (nptr[1] == 'x' || nptr[1] == 'X') { base = 16; nptr += 2; } else base = 8; } while (*nptr >= '0' && *nptr <= '9') { unsigned long int digval = *nptr - '0'; if (result > LONG_MAX / 10 || (result == ULONG_MAX / 10 && digval > ULONG_MAX % 10)) { errno = ERANGE; if (endptr != NULL) *endptr = (char *) nptr; return ULONG_MAX; } result *= base; result += digval; ++nptr; } if (endptr != NULL) *endptr = (char *) nptr; return result * sign; }