Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / powerpc / lib / extable.c

diff --git a/qemu/roms/u-boot/arch/powerpc/lib/extable.c b/qemu/roms/u-boot/arch/powerpc/lib/extable.c
new file mode 100644 (file)
index 0000000..ed047da
--- /dev/null
+++ b/qemu/roms/u-boot/arch/powerpc/lib/extable.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 1999  Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+#include <common.h>
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct exception_table_entry
+{
+       unsigned long insn, fixup;
+};
+
+extern const struct exception_table_entry __start___ex_table[];
+extern const struct exception_table_entry __stop___ex_table[];
+
+static inline unsigned long
+search_one_table(const struct exception_table_entry *first,
+                const struct exception_table_entry *last,
+                unsigned long value)
+{
+       long diff;
+       while (first <= last) {
+               diff = first->insn - value;
+               if (diff == 0)
+                       return first->fixup;
+               first++;
+       }
+
+       return 0;
+}
+
+unsigned long
+search_exception_table(unsigned long addr)
+{
+       unsigned long ret;
+
+       /* There is only the kernel to search.  */
+       ret = search_one_table(__start___ex_table, __stop___ex_table-1, addr);
+       /* if the serial port does not hang in exception, printf can be used */
+#if !defined(CONFIG_SYS_SERIAL_HANG_IN_EXCEPTION)
+       debug("Bus Fault @ 0x%08lx, fixup 0x%08lx\n", addr, ret);
+#endif
+       if (ret) return ret;
+
+       return 0;
+}