Add big-endian railroad crossing sample and big-endian versions of libraries

1 files changed, 30 insertions, 0 deletions

diff --git a/c/rvcontroller-libraries/rvcontroller-init-be.S b/c/rvcontroller-libraries/rvcontroller-init-be.S
new file mode 100644
index 0000000..86389c7
--- /dev/null
+++ b/c/rvcontroller-libraries/rvcontroller-init-be.S
@@ -0,0 +1,30 @@
+#Assembly stub for C programs targeting RVController - Big-endian Flavor
+#A product of Advanced Mesecons Devices, a Cheapie Systems company
+#This is free and unencumbered software released into the public domain.
+#See http://unlicense.org/ for more information
+
+#This file should always be linked first.
+#RVController has a default reset vector of 0,
+#therefore _start should end up as the first thing in the file.
+
+.section .text.startup
+_start:
+
+# Switch to big-endian mode (little-endian is default after reset)
+li t0,0x20 # MBE
+csrrs x0,0x310,t0 # 0x310 = mstatush
+
+# Set up stack pointer
+li sp,0x10000
+
+# Call main function
+call main
+
+# Exit program
+li a7,10
+ecall
+
+# Shouldn't ever get here, will crash if it does
+ret
+
+.globl _start