diff options
Diffstat (limited to 'newlib/libc/sys/linux/dl/dl-minimal.c')
| -rw-r--r-- | newlib/libc/sys/linux/dl/dl-minimal.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/dl/dl-minimal.c b/newlib/libc/sys/linux/dl/dl-minimal.c new file mode 100644 index 000000000..807bfad63 --- /dev/null +++ b/newlib/libc/sys/linux/dl/dl-minimal.c @@ -0,0 +1,250 @@ +/* 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; +} |