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authorEric Andersen <andersen@codepoet.org>2004-12-21 08:35:58 +0000
committerEric Andersen <andersen@codepoet.org>2004-12-21 08:35:58 +0000
commit05d9958f685e3f0c51be4f1128348645451e51fb (patch)
treeb28c486ae60ad9065ba6d061b494c253fdc73ef5 /libc/sysdeps/linux/bfin/crt0.S
parentf6cc7543c5530106123f1fa7958d1c594ddff3d8 (diff)
Add support for the Analog Devices Blackfin mmuless processor
Diffstat (limited to 'libc/sysdeps/linux/bfin/crt0.S')
-rw-r--r--libc/sysdeps/linux/bfin/crt0.S68
1 files changed, 68 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/bfin/crt0.S b/libc/sysdeps/linux/bfin/crt0.S
new file mode 100644
index 000000000..4ddfd16b9
--- /dev/null
+++ b/libc/sysdeps/linux/bfin/crt0.S
@@ -0,0 +1,68 @@
+/* Copyright (C) 1991, 1992 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 Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+
+/* 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]
+*/
+
+.text
+.align 2
+.global _start;
+.type _start,STT_FUNC;
+.global ___uClibc_main;
+.type ___uClibc_main,STT_FUNC;
+
+/* 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,STT_FUNC;
+
+_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 -- which its final resting place */
+ R1 = P0;
+
+/* Skip to the end of argv and put a pointer to the environment in R2 */
+ R2 = R0;
+ R2 <<= 2;
+ R2 += 4;
+ R2 = R1+R2;
+
+/* Ok, now run uClibc's main() -- shouldn't return */
+ sp += -12;
+ jump.l ___uClibc_main;
+