diff mbox

[kvm-unit-tests,V2,2/4] lib/powerpc: Add generic decrementer exception handler

Message ID 1470794377-14427-2-git-send-email-sjitindarsingh@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Suraj Jitindar Singh Aug. 10, 2016, 1:59 a.m. UTC
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@gmail.com>
---
 lib/powerpc/asm/handlers.h |  8 ++++++++
 lib/powerpc/handlers.c     | 25 +++++++++++++++++++++++++
 lib/ppc64/asm/handlers.h   |  1 +
 powerpc/Makefile.common    |  1 +
 4 files changed, 35 insertions(+)
 create mode 100644 lib/powerpc/asm/handlers.h
 create mode 100644 lib/powerpc/handlers.c
 create mode 100644 lib/ppc64/asm/handlers.h

Comments

Thomas Huth Aug. 10, 2016, 10:38 a.m. UTC | #1
On 10.08.2016 03:59, Suraj Jitindar Singh wrote:
> 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@gmail.com>
> ---
>  lib/powerpc/asm/handlers.h |  8 ++++++++
>  lib/powerpc/handlers.c     | 25 +++++++++++++++++++++++++
>  lib/ppc64/asm/handlers.h   |  1 +
>  powerpc/Makefile.common    |  1 +
>  4 files changed, 35 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..6a621f1
> --- /dev/null
> +++ b/lib/powerpc/handlers.c
> @@ -0,0 +1,25 @@
> +/*
> + * 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)
> +					:
> +		     );

I think most "asm volatile" statements are written in a more condensed
way in kvm-unit-tests, so it might be more consistent to do that here,
too instead:

	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)

Apart from the above cosmetic nit, the patch looks fine to me.

Reviewed-by: Thomas Huth <thuth@redhat.com>

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Suraj Jitindar Singh Aug. 12, 2016, 6:17 a.m. UTC | #2
On Wed, 2016-08-10 at 12:38 +0200, Thomas Huth wrote:
> On 10.08.2016 03:59, Suraj Jitindar Singh wrote:
> > 
> > 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@gmail.com>
> > ---
> >  lib/powerpc/asm/handlers.h |  8 ++++++++
> >  lib/powerpc/handlers.c     | 25 +++++++++++++++++++++++++
> >  lib/ppc64/asm/handlers.h   |  1 +
> >  powerpc/Makefile.common    |  1 +
> >  4 files changed, 35 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..6a621f1
> > --- /dev/null
> > +++ b/lib/powerpc/handlers.c
> > @@ -0,0 +1,25 @@
> > +/*
> > + * 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)
> > +					:
> > +		     );
> I think most "asm volatile" statements are written in a more
> condensed
> way in kvm-unit-tests, so it might be more consistent to do that
> here,
> too instead:
> 
> 	asm volatile("mtdec %0"	: : "r" (dec));
> 
Will make whitespace changes to make this look more like existing code.
> > 
> > +}
> > 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)
> Apart from the above cosmetic nit, the patch looks fine to me.
> 
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> 
Thanks for looking at this
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

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..6a621f1
--- /dev/null
+++ b/lib/powerpc/handlers.c
@@ -0,0 +1,25 @@ 
+/*
+ * 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)