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-rw-r--r--contrib/gcc/config/i386/cygwin.asm42
1 files changed, 39 insertions, 3 deletions
diff --git a/contrib/gcc/config/i386/cygwin.asm b/contrib/gcc/config/i386/cygwin.asm
index a27af31..c8378fa 100644
--- a/contrib/gcc/config/i386/cygwin.asm
+++ b/contrib/gcc/config/i386/cygwin.asm
@@ -1,7 +1,45 @@
-/* stuff needed for libgcc on win32. */
+/* stuff needed for libgcc on win32.
+ *
+ * Copyright (C) 1996, 1998, 2001, 2003 Free Software Foundation, Inc.
+ * Written By Steve Chamberlain
+ *
+ * This file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * In addition to the permissions in the GNU General Public License, the
+ * Free Software Foundation gives you unlimited permission to link the
+ * compiled version of this file with other programs, and to distribute
+ * those programs without any restriction coming from the use of this
+ * file. (The General Public License restrictions do apply in other
+ * respects; for example, they cover modification of the file, and
+ * distribution when not linked into another program.)
+ *
+ * This file 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * As a special exception, if you link this library with files
+ * compiled with GCC to produce an executable, this does not cause
+ * the resulting executable to be covered by the GNU General Public License.
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ */
#ifdef L_chkstk
+/* Function prologue calls _alloca to probe the stack when allocating more
+ than CHECK_STACK_LIMIT bytes in one go. Touching the stack at 4K
+ increments is necessary to ensure that the guard pages used
+ by the OS virtual memory manger are allocated in correct sequence. */
+
.global ___chkstk
.global __alloca
___chkstk:
@@ -27,6 +65,4 @@ done: subl %eax,%ecx
movl (%eax),%ecx /* recover saved temp */
movl 4(%eax),%eax /* get return address */
jmp *%eax
-
-
#endif
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