Initial revision

sysdeps/unix/bsd/ultrix4/mips/start.S

@@ -0,0 +1,70 @@
+/* Copyright (C) 1993 Free Software Foundation, Inc.
+   Contributed by Brendan Kehoe (brendan@zen.org).
+
+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 <sysdep.h>
+
+#ifndef HAVE_GNU_LD
+#define __environ environ
+#endif
+
+.comm __environ,	4
+.comm errno,		4
+
+ENTRY(__start)
+  .set noreorder
+
+  /* The first thing on the stack is argc.  */
+  lw t0, 0(sp)
+  nop
+
+  /* Set up the global pointer.  We take up a nop spot here.  */
+  la gp, _gp
+
+  /* Then set up argv.  */
+  addiu t1, sp, 4
+
+  /* To compute where envp is, first we have to jump ahead four
+     bytes from what argv was.  This will bring us ahead, so we don't
+     need to compute the NULL at the end of argv later.  */
+  addiu v1, t1, 4
+
+  /* Now, compute the space to skip given the number of arguments
+     we've got.  We do this by multiplying argc by 4.  */
+  sll v0, t0, 2
+
+  /* Now, add (argv+4) with the space to skip...that's envp.  */
+  addu v1, v1, v0
+  move t2, v1
+
+  /* __environ = envp; */
+  sw t2, __environ
+
+  addiu sp, sp, -24
+
+  /* __libc_init (argc, argv, envp); */
+  move a0, t0
+  move a1, t1
+  move a2, t2
+  jal __libc_init
+  nop
+
+  /* errno = 0; */
+  sw zero, errno
+
+  /* exit (main (argc, argv, envp)); */
+  move a0, t0
+  move a1, t1
+  move a2, t2
+  jal main
+  nop
+
+  /* Make the value returned by main be the argument to exit.  */
+  jal exit
+  move a0, v0