add new architecture support for or1k

Information about Openrisc:
http://opencores.org/or1k/Main_Page
Integrated from:
https://github.com/openrisc/uClibc-or1k

1 files changed, 144 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/or1k/crt1.S b/libc/sysdeps/linux/or1k/crt1.S
new file mode 100644
index 000000000..c1926bef2
--- /dev/null
+++ b/libc/sysdeps/linux/or1k/crt1.S
@@ -0,0 +1,144 @@
+/* Copyright (C) 1995, 1996, 1997, 1998, 2001, 2002, 2005
+   Free Software Foundation, Inc.
+
+   Copyright (C) 2010 Embecosm Limited
+
+   Contributor  Jeremy Bennett <jeremy.bennett@embecosm.com>
+   Contributor  Joern Rennecke <joern.rennecke@embecosm.com>
+   With other contributions from the OpenCores community.
+
+   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.
+
+   In addition to the permissions in the GNU Lesser 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 GNU Lesser 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.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* Stick in a dummy reference to main(), so that if an application
+ * is linking when the main() function is in a static library (.a)
+ * we can be sure that main() actually gets linked in */
+.type main,%function
+
+/* This is the canonical entry point, usually the first thing in the text
+   segment.
+
+   sp		The stack contains the arguments and environment:
+		0(sp)			argc
+		4(sp)			argv[0]
+		...
+		(4*argc)(sp)		NULL
+		(4*(argc+1))(sp)	envp[0]
+		...
+					NULL
+*/
+
+#include <features.h>
+
+.text
+	.globl	_start
+	.type	_start,%function
+
+.global _start
+_start:
+
+#ifdef __PIC__
+	/* Obtain a pointer to .got in r16 */
+	l.jal	.LPC0
+#ifndef __OR1K_NODELAY__
+	l.nop
+#endif
+.LPC0:
+	l.movhi	r16, gotpchi(_GLOBAL_OFFSET_TABLE_+(.-.LPC0))
+	l.ori	r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+(.-.LPC0))
+	l.add	r16, r16, r9
+#endif
+
+	/* Push stack limit onto the stack */
+	/* Provides highest stack address to user code (as stack grows
+	 * downwards
+	 * This is the seventh argument to __uClibc_main and thus needs to
+	 * be passed on the stack
+	 */
+	l.sw  -4(r1),r1
+
+	/* Take values for argc and argv off the stack.
+	 * These will be passed as arguments two and three to __uClibc_main
+	 * and thus go in registers r4 and r5, respectively
+	 */
+	l.lwz  r4,0(r1)
+	l.addi r5,r1,4
+
+#ifdef __PIC__
+	l.lwz	r3,got(main)(r16)
+#else
+	l.movhi r3,hi(main)
+	l.ori   r3,r3,lo(main)
+#endif
+
+	/* Put the constructor and destructor initialization as args four and
+	   five into r6 and r7 */
+#ifdef __PIC__
+	l.lwz	r6, got(_init)(r16)
+	l.lwz	r7, got(_fini)(r16)
+#else
+	l.movhi	r6,hi(_init)
+	l.ori	r6,r6,lo(_init)
+	l.movhi	r7,hi(_fini)
+	l.ori	r7,r7,lo(_fini)
+#endif
+
+	/* rtld_fini = NULL */
+	l.movhi	r8, 0
+
+	/* Adjust stack to account for a total of 7 args (i.e. the last one is
+	   on the stack. */
+	l.addi  r1,r1,-4
+
+	/* Clear the frame pointer and link register since this is the
+	 * outermost frame.
+	 */
+	l.add r2,r0,r0
+	l.add r9,r0,r0
+
+	/* Let the libc call main and exit with its return code.  */
+#ifdef __PIC__
+	l.j	plt(__uClibc_main)
+#else
+	l.j	__uClibc_main
+#endif
+	 l.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