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authorEric Andersen <andersen@codepoet.org>2001-10-11 08:29:22 +0000
committerEric Andersen <andersen@codepoet.org>2001-10-11 08:29:22 +0000
commit5c12c8eecd5f2e06c200651e90befe85efcf166f (patch)
treedbaed54145d28357e3b145ad8631529ffd0c2344 /libc/sysdeps/linux/v850/crt0.S
parenta924265e43cf2fcad97fc9489da482a27b0faf93 (diff)
Patch from Miles Bader <miles@lsi.nec.co.jp> to support the v850.
He sent this patch to me a month ago, but I forgot to apply it...
Diffstat (limited to 'libc/sysdeps/linux/v850/crt0.S')
-rw-r--r--libc/sysdeps/linux/v850/crt0.S51
1 files changed, 51 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/v850/crt0.S b/libc/sysdeps/linux/v850/crt0.S
new file mode 100644
index 000000000..7bfa9e004
--- /dev/null
+++ b/libc/sysdeps/linux/v850/crt0.S
@@ -0,0 +1,51 @@
+/*
+ * libc/sysdeps/linux/v850/crt0.S -- Initial program entry point for linux/v850
+ *
+ * Copyright (C) 2001 NEC Corporation
+ * Copyright (C) 2001 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 <clinkage.h>
+
+/* Upon entry, the stack contains the following data:
+ argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
+*/
+
+ .text
+C_ENTRY(start):
+ ld.w 0[sp], r6 // Arg 0: argc
+
+ addi 4, sp, r7 // Arg 1: argv
+
+ mov r7, r8 // Arg 2: envp
+ mov r6, r10 // skip argc elements to get envp start
+1: add 4, r8
+ add -1, r10
+ bp 1b
+
+ // Zero bss area, since we can't rely upon any loader to do so
+ mov hilo(C_SYMBOL_NAME(edata)), ep
+ mov hilo(C_SYMBOL_NAME(end)), r10
+2: sst.w r0, 0[ep]
+ add 4, ep
+ cmp ep, r10
+ bne 2b
+
+ // Load CTBP register
+ mov hilo(C_SYMBOL_NAME(_ctbp)), r19
+ ldsr r19, ctbp
+
+ // Load GP
+ mov hilo(C_SYMBOL_NAME(_gp)), gp
+
+ // call uclibc's startup routine
+ jarl C_SYMBOL_NAME(__uClibc_main), lp
+
+ // should never get here....
+ jr C_SYMBOL_NAME(abort)