update crt0 to crt1 based heavily on glibc start.S and to sync up with __uClibc_main changes

1 files changed, 91 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/sh/crt1.S b/libc/sysdeps/linux/sh/crt1.S
new file mode 100644
index 000000000..fc0ce355d
--- /dev/null
+++ b/libc/sysdeps/linux/sh/crt1.S
@@ -0,0 +1,91 @@
+/* Startup code for SH & ELF.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Copyright (C) 2001 Hewlett-Packard Australia
+   Copyright (C) 2002 Stefan Allius
+
+ This program 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.
+
+ This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+
+/* This is the canonical entry point, usually the first thing in the text
+   segment.
+
+	At this entry point, most registers' values are unspecified, except:
+
+   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
+	.type main,%function
+_start:
+	/* Clear the frame pointer since this is the outermost frame. */
+	mov #0, r14
+
+	/* Pop argc off the stack and save a pointer to argv */
+	mov.l @r15+,r5
+	mov r15, r6
+
+	/* Push the fini func onto the stack */
+	mov.l r4,@-r15
+	mov.l L_fini,r0
+	mov.l r0,@-r15
+
+	/* Set up the main/init funcs that go in registers */
+	mov.l L_main,r4
+	mov.l L_init,r7
+
+	/* __uClibc_main (main, argc, argv, init, fini) */
+
+	/* Let the libc call main and exit with its return code.  */
+	mov.l L_uClibc_main,r1
+	jsr @r1
+	nop
+	/* We should not get here. */
+	mov.l L_abort,r1
+	jmp @r1
+	nop
+
+	.size _start,.-_start
+	.align	2
+
+L_main:
+	.long   main
+L_init:
+	.long   _init
+L_fini:
+	.long   _fini
+L_uClibc_main:
+	.long   __uClibc_main
+L_abort:
+	.long   abort
+
+/* 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