Wed Nov 22 12:37:39 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>cvs/libc-951123

	* sysdeps/unix/sysv/linux/i386/sysdep.S (_errno): Define as alias
	for errno.

	* stdio-common/vfprintf.c [USE_IN_LIBIO] (vfprintf): Define as
	alias for _IO_vfprintf.

	* sysdeps/unix/sysv/linux/sockaddrcom.h: File removed.

	* sysdeps/unix/sysv/linux/i386/init-first.c (init): Use
	__fpu_control instead of ___fpu_control.
	* sysdeps/unix/sysv/linux/i386/ieee_fpu.c
	(___fpu_control): Renamed to __fpu_control.
	* sysdeps/unix/sysv/linux/i386/fpu_control.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/fpu_control.c: Likewise.

	* elf/dl-minimal.c: New file.
	* elf/Makefile (rtld-routines): Add dl-minimal.
	* elf/rtld.c (__dgettext, __assert_fail, __assert_perror_fail):
	Functions moved to dl-minimal.c.
	* sysdeps/mach/hurd/dl-sysdep.c (malloc, free, realloc,
	sigjmp_save, longjmp): Likewise.

	* sysdeps/unix/sysv/linux/i386/brk.S (__curbrk): Always initialize
	to &_end, regardless of PIC.

	* stdio-common/vfscanf.c (__vfscanf): Fix arg name in defn.

1 files changed, 153 insertions, 0 deletions

diff --git a/elf/dl-minimal.c b/elf/dl-minimal.c
new file mode 100644
index 0000000000..332f21e0b0
--- /dev/null
+++ b/elf/dl-minimal.c
@@ -0,0 +1,153 @@
+/* Minimal replacements for basic facilities used in the dynamic linker.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include <link.h>
+#include "../stdio-common/_itoa.h"
+
+/* Minimal `malloc' allocator for use while loading shared libraries.
+   Only small blocks are allocated, and none are ever freed.  */
+
+static void *alloc_ptr, *alloc_end, *alloc_last_block;
+
+void *
+malloc (size_t n)
+{
+  extern int _dl_zerofd;
+  static size_t pagesize;
+
+  if (pagesize == 0)
+    pagesize = __getpagesize ();
+
+  if (_dl_zerofd == -1)
+    _dl_zerofd = _dl_sysdep_open_zero_fill ();
+
+  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) + pagesize - 1)
+				& ~(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;
+      assert (n <= pagesize);
+      page = mmap (0, pagesize, PROT_READ|PROT_WRITE, MAP_ANON, _dl_zerofd, 0);
+      assert (page != (caddr_t) -1);
+      if (page != alloc_end)
+	alloc_ptr = page;
+      alloc_end = page + pagesize;
+    }
+
+  alloc_last_block = (void *) alloc_ptr;
+  alloc_ptr += n;
+  return alloc_last_block;
+}
+weak_symbol (malloc)
+
+/* This will rarely be called.  */
+void
+free (void *ptr)
+{
+  /* We can free only the last block allocated.  */
+  if (ptr == alloc_last_block)
+    alloc_ptr = alloc_last_block;
+}
+weak_symbol (free)
+
+/* This is never called.  */
+void *
+realloc (void *ptr, size_t n)
+{ ptr += n; abort (); }
+weak_symbol (realloc)
+
+/* Avoid signal frobnication in setjmp/longjmp.  Keeps things smaller.  */
+
+#include <setjmp.h>
+
+int __sigjmp_save (sigjmp_buf env, int savemask)
+{ env[0].__mask_was_saved = savemask; return 0; }
+weak_symbol (__sigjmp_save)
+
+void
+longjmp (jmp_buf env, int val) { __longjmp (env[0].__jmpbuf, val); }
+weak_symbol (longjmp)
+
+
+/* Define our own stub for the localization function used by strerror.
+   English-only in the dynamic linker keeps it smaller.  */
+
+char *
+__dgettext (const char *domainname, const char *msgid)
+{
+  assert (domainname == _libc_intl_domainname);
+  return (char *) msgid;
+}
+weak_symbol (__dgettext)
+weak_alias (__dgettext, dgettext)
+
+#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
+__assert_fail (const char *assertion,
+	       const char *file, unsigned int line, const char *function)
+{
+  char buf[64];
+  buf[sizeof buf - 1] = '\0';
+  _dl_sysdep_fatal ("BUG IN DYNAMIC LINKER ld.so: ",
+		    file, ": ", _itoa (line, buf + sizeof buf - 1, 10, 0),
+		    ": ", function ?: "", function ? ": " : "",
+		    "Assertion `", assertion, "' failed!\n",
+		    NULL);
+
+}
+weak_symbol (__assert_fail)
+
+void
+__assert_perror_fail (int errnum,
+		      const char *file, unsigned int line,
+		      const char *function)
+{
+  char buf[64];
+  buf[sizeof buf - 1] = '\0';
+  _dl_sysdep_fatal ("BUG IN DYNAMIC LINKER ld.so: ",
+		    file, ": ", _itoa (line, buf + sizeof buf - 1, 10, 0),
+		    ": ", function ?: "", function ? ": " : "",
+		    "Unexpected error: ", strerror (errnum), "\n", NULL);
+
+}
+weak_symbol (__assert_perror_fail)
+
+#endif