Add the lib/powerpc/handlers.c file and associated header files as a place
to implement generic exception handler functions for inclusion in tests.
Add a generic exception handler for a decrementer (0x900) interrupt which
will reset the decrementer to its maximum value.
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
---
Change Log:
V2 -> V3:
- Whitespace changes
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx>
---
lib/powerpc/asm/handlers.h | 8 ++++++++
lib/powerpc/handlers.c | 22 ++++++++++++++++++++++
lib/ppc64/asm/handlers.h | 1 +
powerpc/Makefile.common | 1 +
4 files changed, 32 insertions(+)
create mode 100644 lib/powerpc/asm/handlers.h
create mode 100644 lib/powerpc/handlers.c
create mode 100644 lib/ppc64/asm/handlers.h
diff --git a/lib/powerpc/asm/handlers.h b/lib/powerpc/asm/handlers.h
new file mode 100644
index 0000000..64ba727
--- /dev/null
+++ b/lib/powerpc/asm/handlers.h
@@ -0,0 +1,8 @@
+#ifndef _ASMPOWERPC_HANDLERS_H_
+#define _ASMPOWERPC_HANDLERS_H_
+
+#include <asm/ptrace.h>
+
+void dec_except_handler(struct pt_regs *regs, void *data);
+
+#endif /* _ASMPOWERPC_HANDLERS_H_ */
diff --git a/lib/powerpc/handlers.c b/lib/powerpc/handlers.c
new file mode 100644
index 0000000..be8226a
--- /dev/null
+++ b/lib/powerpc/handlers.c
@@ -0,0 +1,22 @@
+/*
+ * Generic exception handlers for registration and use in tests
+ *
+ * Copyright 2016 Suraj Jitindar Singh, IBM.
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.
+ */
+
+#include <libcflat.h>
+#include <asm/handlers.h>
+#include <asm/ptrace.h>
+
+/*
+ * Generic handler for decrementer exceptions (0x900)
+ * Just reset the decrementer back to its maximum value (0x7FFFFFFF)
+ */
+void dec_except_handler(struct pt_regs *regs __unused, void *data __unused)
+{
+ uint32_t dec = 0x7FFFFFFF;
+
+ asm volatile ("mtdec %0" : : "r" (dec));
+}
diff --git a/lib/ppc64/asm/handlers.h b/lib/ppc64/asm/handlers.h
new file mode 100644
index 0000000..92e6fb2
--- /dev/null
+++ b/lib/ppc64/asm/handlers.h
@@ -0,0 +1 @@
+#include "../../powerpc/asm/handlers.h"
diff --git a/powerpc/Makefile.common b/powerpc/Makefile.common
index 3f8887d..404194b 100644
--- a/powerpc/Makefile.common
+++ b/powerpc/Makefile.common
@@ -36,6 +36,7 @@ cflatobjs += lib/powerpc/hcall.o
cflatobjs += lib/powerpc/setup.o
cflatobjs += lib/powerpc/rtas.o
cflatobjs += lib/powerpc/processor.o
+cflatobjs += lib/powerpc/handlers.o
FLATLIBS = $(libcflat) $(LIBFDT_archive)
%.elf: CFLAGS += $(arch_CFLAGS)
--
2.5.5
--
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