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-rw-r--r--elf/dl-minimal.c380
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diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
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-/* Minimal replacements for basic facilities used in the dynamic linker.
- Copyright (C) 1995-2017 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
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <string.h>
-#include <tls.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include <ldsodefs.h>
-#include <_itoa.h>
-#include <malloc/malloc-internal.h>
-
-#include <assert.h>
-
-/* Minimal malloc allocator for used during initial link. After the
- initial link, a full malloc implementation is interposed, either
- the one in libc, or a different one supplied by the user through
- interposition. */
-
-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);
-
-
-/* Allocate an aligned memory block. */
-void * weak_function
-malloc (size_t n)
-{
- if (alloc_end == 0)
- {
- /* Consume any unused space in the last page of our data segment. */
- extern int _end attribute_hidden;
- alloc_ptr = &_end;
- alloc_end = (void *) 0 + (((alloc_ptr - (void *) 0)
- + GLRO(dl_pagesize) - 1)
- & ~(GLRO(dl_pagesize) - 1));
- }
-
- /* Make sure the allocation pointer is ideally aligned. */
- alloc_ptr = (void *) 0 + (((alloc_ptr - (void *) 0) + MALLOC_ALIGNMENT - 1)
- & ~(MALLOC_ALIGNMENT - 1));
-
- if (alloc_ptr + n >= alloc_end || n >= -(uintptr_t) alloc_ptr)
- {
- /* Insufficient space left; allocate another page plus one extra
- page to reduce number of mmap calls. */
- caddr_t page;
- size_t nup = (n + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1);
- if (__glibc_unlikely (nup == 0 && n != 0))
- return NULL;
- nup += GLRO(dl_pagesize);
- page = __mmap (0, nup, PROT_READ|PROT_WRITE,
- MAP_ANON|MAP_PRIVATE, -1, 0);
- if (page == MAP_FAILED)
- return NULL;
- 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)
-{
- /* New memory from the trivial malloc above is always already cleared.
- (We make sure that's true in the rare occasion it might not be,
- by clearing memory in free, below.) */
- size_t bytes = nmemb * size;
-
-#define HALF_SIZE_T (((size_t) 1) << (8 * sizeof (size_t) / 2))
- if (__builtin_expect ((nmemb | size) >= HALF_SIZE_T, 0)
- && size != 0 && bytes / size != nmemb)
- return NULL;
-
- return malloc (bytes);
-}
-
-/* This will rarely be called. */
-void weak_function
-free (void *ptr)
-{
- /* We can free only the last block allocated. */
- if (ptr == alloc_last_block)
- {
- /* Since this is rare, we clear the freed block here
- so that calloc can presume malloc returns cleared memory. */
- memset (alloc_last_block, '\0', alloc_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)
-{
- if (ptr == NULL)
- return malloc (n);
- assert (ptr == alloc_last_block);
- size_t old_size = alloc_ptr - alloc_last_block;
- alloc_ptr = alloc_last_block;
- void *new = malloc (n);
- return new != ptr ? memcpy (new, ptr, old_size) : new;
-}
-
-/* Avoid signal frobnication in setjmp/longjmp. Keeps things smaller. */
-
-#include <setjmp.h>
-
-int weak_function
-__sigjmp_save (sigjmp_buf env, int savemask __attribute__ ((unused)))
-{
- env[0].__mask_was_saved = 0;
- return 0;
-}
-
-/* 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. */
- buf[buflen - 1] = '\0';
- msg = _itoa (errnum, buf + buflen - 1, 10, 0);
- msg = memcpy (msg - (sizeof ("Error ") - 1), "Error ",
- sizeof ("Error ") - 1);
- break;
- }
-
- return msg;
-}
-
-void
-__libc_fatal (const char *message)
-{
- _dl_fatal_printf ("%s", message);
-}
-rtld_hidden_def (__libc_fatal)
-
-void
-__attribute__ ((noreturn))
-__chk_fail (void)
-{
- _exit (127);
-}
-rtld_hidden_def (__chk_fail)
-
-#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);
-
-}
-rtld_hidden_weak (__assert_fail)
-
-void weak_function
-__assert_perror_fail (int errnum,
- const char *file, unsigned int line,
- const char *function)
-{
- char errbuf[400];
- _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));
-
-}
-rtld_hidden_weak (__assert_perror_fail)
-#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;
- unsigned max_digit;
-
- 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;
- max_digit = 9;
- if (*nptr == '0')
- {
- if (nptr[1] == 'x' || nptr[1] == 'X')
- {
- base = 16;
- nptr += 2;
- }
- else
- {
- base = 8;
- max_digit = 7;
- }
- }
-
- while (1)
- {
- unsigned long 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 > ULONG_MAX / base
- || (result == ULONG_MAX / base && digval > ULONG_MAX % base))
- {
- 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;
-}
-
-
-#undef _itoa
-/* We always use _itoa instead of _itoa_word in ld.so since the former
- also has to be present and it is never about speed when these
- functions are used. */
-char *
-_itoa (unsigned long long int value, char *buflim, unsigned int base,
- int upper_case)
-{
- assert (! upper_case);
-
- do
- *--buflim = _itoa_lower_digits[value % base];
- while ((value /= base) != 0);
-
- return buflim;
-}
-
-/* The '_itoa_lower_digits' variable in libc.so is able to handle bases
- up to 36. We don't need this here. */
-const char _itoa_lower_digits[16] = "0123456789abcdef";
-rtld_hidden_data_def (_itoa_lower_digits)
-
-/* The following is not a complete strsep implementation. It cannot
- handle empty delimiter strings. But this isn't necessary for the
- execution of ld.so. */
-#undef strsep
-#undef __strsep
-char *
-__strsep (char **stringp, const char *delim)
-{
- char *begin;
-
- assert (delim[0] != '\0');
-
- begin = *stringp;
- if (begin != NULL)
- {
- char *end = begin;
-
- while (*end != '\0' || (end = NULL))
- {
- const char *dp = delim;
-
- do
- if (*dp == *end)
- break;
- while (*++dp != '\0');
-
- if (*dp != '\0')
- {
- *end++ = '\0';
- break;
- }
-
- ++end;
- }
-
- *stringp = end;
- }
-
- return begin;
-}
-weak_alias (__strsep, strsep)
-strong_alias (__strsep, __strsep_g)
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