Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 380 insertions, 0 deletions

diff --git a/REORG.TODO/elf/dl-minimal.c b/REORG.TODO/elf/dl-minimal.c
new file mode 100644
index 0000000000..1a35baff2e
--- /dev/null
+++ b/REORG.TODO/elf/dl-minimal.c
@@ -0,0 +1,380 @@
+/* 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)