From 0934f142036f12292711770d353f1c01ab718db7 Mon Sep 17 00:00:00 2001
From: "\"Jan-Benedict Glaw\"" <jbglaw@lug-owl.de>
Date: Fri, 27 Jan 2006 21:20:28 +0000
Subject: First round of VAX patches. This isn't complete right now, there are
 for sure still bugs (properly hidden, of course), a libm is completely
 missing (I've got one that implements some basic stuff, but that's really not
 ready for checking in...)

I've also got a list of other things that need touch-ups, but that's mostly
minor stuff that'll be done during the next days.
---
 libc/sysdeps/linux/vax/crt1.S | 73 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 libc/sysdeps/linux/vax/crt1.S

(limited to 'libc/sysdeps/linux/vax/crt1.S')

diff --git a/libc/sysdeps/linux/vax/crt1.S b/libc/sysdeps/linux/vax/crt1.S
new file mode 100644
index 000000000..ea9c105d6
--- /dev/null
+++ b/libc/sysdeps/linux/vax/crt1.S
@@ -0,0 +1,73 @@
+/*
+ * crt0 for VAX
+ */
+
+/*
+ * Program stack looks like:
+ * sp->	argc            argument counter (integer)
+ *	argv[0]         program name (pointer)
+ *	argv[1...N]     program args (pointers)
+ *	argv[argc-1]    end of args (integer)
+ *	NULL
+ *	env[0...N]      environment variables (pointers)
+ *	NULL
+ */
+
+#include <features.h>
+
+.text
+.align 4
+
+.global __start
+__start:
+.global _start
+_start:
+	/* Kernel uses a_interp + 2, so __start isn't exactly CALLSed,	*/
+	/* but we need to have two bytes here, so we use NOPs. This	*/
+	/* won't hurt, though R0 would be invalid to push, but at	*/
+	/* lease this looks like a real function.			*/
+	.word	0x0101
+
+	movl	$0, %fp			/* FP = 0, since this is the	*/
+					/* top-most stack frame		*/
+	movl	%sp, %r0		/* R0 = %sp			*/
+	movl	(%sp)+, %r4		/* R4 = argc			*/
+	movl	%sp, %r3		/* R3 = argv = &argv[0]		*/
+
+#if (defined L_crt1 || defined L_gcrt1) && defined __UCLIBC_CTOR_DTOR__
+	pushl	%r0	# stack_end
+	pushl	$0	# rtld_fini. This is probably needed for the case
+			# where a dynamic linker is involved. So this is
+			# an open FIXME that needs to be addressed at some
+			# time...
+	pushl	$_fini
+	pushl	$_init
+	pushl	%r3	/* Argument pointer */
+	pushl	%r4	/* And the argument count */
+	pushl	$main	/* main() */
+
+	/* We need to call __uClibc_main which should not return.
+	 * __uClibc_main (int (*main) (int, char **, char **),
+	 *                int argc,
+	 *                char **argv,
+	 *                void (*init) (void),
+	 *                void (*fini) (void),
+	 *                void (*rtld_fini) (void),
+	 *                void *stack_end);
+	 */
+	calls	$7, __uClibc_main
+#else /* FIXME: THIS IS BROKEN!!! */
+	/* start to load the arguments from the stack */
+	/* arguments are on ap stack */
+	pushl	%r2
+	pushl	%r3
+	pushl	%r4
+
+	calls	$3, __uClibc_main
+#endif
+
+	/* The above __uClibc_start_main() shouldn't ever return. If it
+	   does, we just crash.  */
+	halt
+.align 2
+
-- 
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