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authorCarmelo Amoroso <carmelo.amoroso@st.com>2010-11-28 21:09:47 +0100
committerCarmelo Amoroso <carmelo.amoroso@st.com>2010-11-28 21:09:47 +0100
commit57f6cce72c889f2e7b342e87a565a064320a6ee2 (patch)
tree5466406472918d3adb63398f5fb9ea1511a5e73f /libc/sysdeps/linux/microblaze/crt1.S
parent4ec89b87bc0eea8d9ca6b50564d12eeb3b1b0119 (diff)
parent5dea871ac73ef4608022c058b50adc946917f9b9 (diff)
Merge commit 'origin/master' into prelink
Conflicts: ldso/include/dl-hash.h Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Diffstat (limited to 'libc/sysdeps/linux/microblaze/crt1.S')
-rw-r--r--libc/sysdeps/linux/microblaze/crt1.S61
1 files changed, 61 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/microblaze/crt1.S b/libc/sysdeps/linux/microblaze/crt1.S
new file mode 100644
index 000000000..e9564cfba
--- /dev/null
+++ b/libc/sysdeps/linux/microblaze/crt1.S
@@ -0,0 +1,61 @@
+/*
+ * libc/sysdeps/linux/microblaze/crt1.S -- Initial program entry point for linux/microblaze
+ *
+ * Copyright (C) 2009 Meyer Sound Laboratories
+ * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
+ * Copyright (C) 2001,2002 NEC Corporation
+ * Copyright (C) 2001,2002 Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License. See the file COPYING.LIB in the main
+ * directory of this archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#include <libc-symbols.h>
+
+/* Upon entry, the stack contains the following data:
+ argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
+*/
+
+ .text
+ .globl C_SYMBOL_NAME(_start)
+ .align 4
+C_SYMBOL_NAME(_start):
+
+ /* Load SDAs */
+ la r2, r0, C_SYMBOL_NAME(_SDA2_BASE_) /* in the original source r2 was SDA, and r13 was SDA2, no idea why */
+ la r13, r0, C_SYMBOL_NAME(_SDA_BASE_)
+
+ /*
+ Preparing arguments for uClibc's startup routine.
+ The routine has 6 arguments, so 5 of them are placed
+ into registers, one on the stack
+ */
+
+ la r5, r0, C_SYMBOL_NAME(main) /* Arg 1: main() */
+ lw r6, r0, r1 /* Arg 2: argc */
+ addi r7, r1, 4 /* Arg 3: argv */
+ la r8, r0, _init /* Arg 4: init */
+ la r9, r0, _fini /* Arg 5: fini */
+ addk r10,r0,r0 /* Arg 6: rtld_fini = NULL */
+
+
+ /* Reserve space for __uClibc_main to save parameters
+ (Microblaze ABI stack calling convention)
+ and for stack_end argument to __uClibc_main */
+ add r3, r1, r0
+ addi r1, r1, -32
+
+ /* tail-call uClibc's startup routine */
+ brid C_SYMBOL_NAME(__uClibc_main)
+ swi r3, r1, 28 /* Arg 7: stack end [DELAY SLOT] */
+
+/* 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