first (broken) pass at updating to new crt style

1 files changed, 74 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/bfin/crt1.S b/libc/sysdeps/linux/bfin/crt1.S
new file mode 100644
index 000000000..7b6a99de0
--- /dev/null
+++ b/libc/sysdeps/linux/bfin/crt1.S
@@ -0,0 +1,74 @@
+/* Initial C runtime code for Blackfin
+ *
+ * Copyright (C) 2004-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* When we enter this piece of code, the user stack looks like this:
+*      argc            argument counter (integer)
+*      argv[0]         program name (pointer)
+*      argv[1...N]     program args (pointers)
+*      NULL
+*      env[0...N]      environment variables (pointers)
+*      NULL
+
+*   When we are done here, we want
+*	R0=argc
+*	R1=*argv[0]
+*	R2=*envp[0]
+*/
+
+#include <features.h>
+
+.text
+.align 2
+.global __start;
+.type	__start,STT_FUNC;
+.global ___uClibc_main;
+.type	___uClibc_main,STT_FUNC;
+
+#if defined(__UCLIBC_CTOR_DTOR__)
+.type   __init,%function
+.type   __fini,%function
+#else
+.weak   __init
+.weak   __fini
+#endif
+
+/*
+	When we enter, our stack looks like:
+	[ SP ]
+	[argc][argv]...
+
+	Call ___uClibc_main(argc, argv, __init, __fini)
+	                     R0    R1     R2    stack
+
+	Before we call main, we want:
+	[ SP ]
+	[fini][argc][argv]
+*/
+
+__start:
+
+/*	clear the frame pointer */
+	FP = 0;
+
+/*	Load register R0 (argc) from the stack to its final resting place */
+	P0 = SP;
+	R0 = [P0++];
+
+/*	Copy argv pointer into R1 */
+	R1 = P0;
+
+/*	Load __init into R2 */
+	R2 = __init;
+
+/*	Load __fini onto the stack */
+	P0 = __fini;
+	[SP--] = P0;
+
+/*	Ok, now run uClibc's main() -- shouldn't return */
+	sp += -8;
+	jump.l	___uClibc_main;
+.size __start,.-__start