Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / xtensa / include / asm / traps.h

diff --git a/kernel/arch/xtensa/include/asm/traps.h b/kernel/arch/xtensa/include/asm/traps.h
new file mode 100644 (file)
index 0000000..677bfcf
--- /dev/null
+++ b/kernel/arch/xtensa/include/asm/traps.h
@@ -0,0 +1,59 @@
+/*
+ * arch/xtensa/include/asm/traps.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012 Tensilica Inc.
+ */
+#ifndef _XTENSA_TRAPS_H
+#define _XTENSA_TRAPS_H
+
+#include <asm/ptrace.h>
+
+/*
+ * handler must be either of the following:
+ *  void (*)(struct pt_regs *regs);
+ *  void (*)(struct pt_regs *regs, unsigned long exccause);
+ */
+extern void * __init trap_set_handler(int cause, void *handler);
+extern void do_unhandled(struct pt_regs *regs, unsigned long exccause);
+void secondary_trap_init(void);
+
+static inline void spill_registers(void)
+{
+#if XCHAL_NUM_AREGS > 16
+       __asm__ __volatile__ (
+               "       call12  1f\n"
+               "       _j      2f\n"
+               "       retw\n"
+               "       .align  4\n"
+               "1:\n"
+               "       _entry  a1, 48\n"
+               "       addi    a12, a0, 3\n"
+#if XCHAL_NUM_AREGS > 32
+               "       .rept   (" __stringify(XCHAL_NUM_AREGS) " - 32) / 12\n"
+               "       _entry  a1, 48\n"
+               "       mov     a12, a0\n"
+               "       .endr\n"
+#endif
+               "       _entry  a1, 48\n"
+#if XCHAL_NUM_AREGS % 12 == 0
+               "       mov     a8, a8\n"
+#elif XCHAL_NUM_AREGS % 12 == 4
+               "       mov     a12, a12\n"
+#elif XCHAL_NUM_AREGS % 12 == 8
+               "       mov     a4, a4\n"
+#endif
+               "       retw\n"
+               "2:\n"
+               : : : "a12", "a13", "memory");
+#else
+       __asm__ __volatile__ (
+               "       mov     a12, a12\n"
+               : : : "memory");
+#endif
+}
+
+#endif /* _XTENSA_TRAPS_H */