Move m68k from ports to libc

1 files changed, 120 insertions, 0 deletions

diff --git a/sysdeps/m68k/start.S b/sysdeps/m68k/start.S
new file mode 100644
index 0000000000..fd33ecdea8
--- /dev/null
+++ b/sysdeps/m68k/start.S
@@ -0,0 +1,120 @@
+/* Startup code compliant to the ELF m68k ABI.
+   Copyright (C) 1996-2014 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 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This is the canonical entry point, usually the first thing in the text
+   segment.  The SVR4/m68k ABI says that when the entry point runs,
+   most registers' values are unspecified, except for:
+
+   %a1		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:
+		0(%sp)			argc
+		4(%sp)			argv[0]
+		...
+		(4*argc)(%sp)		NULL
+		(4*(argc+1))(%sp)	envp[0]
+		...
+					NULL
+*/
+
+#include <sysdep.h>
+
+	.text
+	.globl _start
+	.type _start,@function
+_start:
+	/* Clear the frame pointer.  The ABI suggests this be done, to mark
+	   the outermost frame obviously.  */
+	sub.l %fp, %fp
+
+	/* 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.  */
+	move.l (%sp)+, %d0	/* Pop the argument count.  */
+	move.l %sp, %a0		/* The argument vector starts just at the
+				   current stack top.  */
+
+	/* Provide the highest stack address to the user code (for stacks
+	   which grow downward).  */
+	pea (%sp)
+
+	pea (%a1)		/* Push address of the shared library
+				   termination function.  */
+
+#ifdef SHARED
+	/* Load PIC register.  */
+	LOAD_GOT (%a5)
+
+	/* Push the address of our own entry points to `.fini' and
+	   `.init'.  */
+	move.l __libc_csu_fini@GOT(%a5), -(%sp)
+	move.l __libc_csu_init@GOT(%a5), -(%sp)
+
+	pea (%a0)		/* Push second argument: argv.  */
+	move.l %d0, -(%sp)	/* Push first argument: argc.  */
+
+	move.l main@GOT(%a5), -(%sp)
+
+	/* Call the user's main function, and exit with its value.  But
+	   let the libc call main.  */
+	jbsr __libc_start_main@PLTPC
+#else
+	/* Push the address of our own entry points to `.fini' and
+	   `.init'.  */
+	pea __libc_csu_fini
+	pea __libc_csu_init
+
+	pea (%a0)		/* Push second argument: argv.  */
+	move.l %d0, -(%sp)	/* Push first argument: argc.  */
+
+	pea main
+
+	/* Call the user's main function, and exit with its value.  But
+	   let the libc call main.  */
+	jbsr __libc_start_main
+#endif
+
+	illegal			/* Crash if somehow `exit' does return.  */
+
+/* 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