Startup code for ELF binaries on CRIS.

diff --git a/sysdeps/cris/elf/start.S b/sysdeps/cris/elf/start.S
new file mode 100644 (file)
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+++ b/sysdeps/cris/elf/start.S
@@ -0,0 +1,123 @@
+/* Startup code compliant to the ELF CRIS ABI (to-be-written).
+   Copyright (C) 2001 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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sysdep.h>
+
+/* This is the canonical entry point, usually the first thing in the text
+   segment.  When the entry point runs, most registers' values are
+   unspecified, except for:
+
+   R10         Contains a function pointer to be registered with `atexit'.
+               This is how the dynamic linker arranges to have DT_FINI
+               functions called for shared libraries that have been loaded
+               before this code runs.
+
+   SP          The stack contains the arguments and environment:
+               [SP]                    argc
+               [SP+4]                  argv[0]
+               ...
+               [SP+4*argc]             NULL
+               [SP+4*(argc+1)]         envp[0]
+               ...
+                                       NULL
+*/
+
+       .syntax no_register_prefix
+
+       .text
+       .globl  _start
+_start:
+       /* Clear the frame pointer, to mark the outermost frame.  */
+       moveq   0,r8
+
+       /* Move the shared library termination function to the right place
+          for __libc_main.  */
+       move.d  r10,r9
+
+       /* Extract the arguments as encoded on the stack and set up the
+          arguments for `main': argc, argv.  envp will be determined
+          later in __libc_start_main.  */
+
+       /* Get the argument count.  */
+       move.d  [sp],r11
+
+       /* Store the stack pointer as end of stack.  We overwrite
+          the incoming argc.  */
+       move.d  sp,[sp]
+
+       /* The argument vector starts just after the argument count.  */
+       move.d  sp,r12
+       addq    4,r12
+
+       /* There are seven arguments to __libc_start_main:
+          r10:  main - Address of it.
+          r11:  argc
+          r12:  argv
+          r13:  init - Function to call.
+
+          [sp]: fini - Function to register with atexit.
+           [sp+4]: rtld_fini - Another function to register with atexit.
+          [sp+8]: stack_end - Top of stack (actually same as argv).
+
+          The last two are passed on stack.  */
+
+        /* Store the fini function coming from the dynamic loader.  */
+       push    r9
+
+       /* Get the addresses of our own entry points to `.fini' and
+          `.init'.  */
+
+#ifdef __PIC__
+        /* If for some reason this program is compiled as PIC, set up R0.  */
+       move.d  pc,r0
+       sub.d   .:GOTOFF,r0
+
+       move.d  _init:PLTG,r13
+       add.d   r0,r13
+       move.d  _fini:PLTG,r9
+       add.d   r0,r9
+       move.d  main:PLTG,r10
+       add.d   r0,r10
+#else
+       move.d  _init,r13
+       move.d  _fini,r9
+       move.d  main,r10
+#endif
+       push    r9
+
+       /* Call the user's main function, and exit with its value.  But
+          let the libc call main.  */
+       PLTCALL (__libc_start_main)
+
+       /* Crash if somehow `exit' does return.  We have at least 8192
+          invalid addresses to choose from.  */
+       test.d  [6502]
+
+       /* Stop the unstoppable.  */
+0:
+       ba      0b
+       nop
+
+/* Define a symbol for the first piece of initialized data.  */
+       .data
+       .globl __data_start
+__data_start:
+       .long   0
+       .weak   data_start
+       data_start = __data_start