powerpc/64s: Add new exception vector macros

Create arch/powerpc/include/asm/head-64.h with macros that specify
an exception vector (name, type, location), which will be used to
label and lay out exceptions into the object file.

Naming is moved out of exception-64s.h, which is used to specify the
implementation of exception handlers.

objdump of generated code in exception vectors is unchanged except for
names. Alignment directives scattered around are annoying, but done
this way so that disassembly can verify identical instruction
generation before and after patch. These get cleaned up in future
patch.

We change the way KVMTEST works, explicitly passing EXC_HV or EXC_STD
rather than overloading the trap number. This removes the need to have
SOFTEN values for the overloaded trap numbers, eg. 0x502.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 163 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/head-64.h b/arch/powerpc/include/asm/head-64.h
new file mode 100644
index 000000000000..358c25c80c62
--- /dev/null
+++ b/arch/powerpc/include/asm/head-64.h
@@ -0,0 +1,163 @@
+#ifndef _ASM_POWERPC_HEAD_64_H
+#define _ASM_POWERPC_HEAD_64_H
+
+#include <asm/cache.h>
+
+#define EXC_REAL_BEGIN(name, start, end)			\
+	. = start ;							\
+	.global exc_real_##start##_##name ;				\
+exc_real_##start##_##name:
+
+#define EXC_REAL_END(name, start, end)
+
+#define EXC_VIRT_BEGIN(name, start, end)			\
+	. = start ;							\
+	.global exc_virt_##start##_##name ;				\
+exc_virt_##start##_##name:
+
+#define EXC_VIRT_END(name, start, end)
+
+#define EXC_COMMON_BEGIN(name)					\
+	.global name;							\
+name:
+
+#define TRAMP_REAL_BEGIN(name)					\
+	.global name ;							\
+name:
+
+#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
+#define TRAMP_KVM_BEGIN(name)						\
+	TRAMP_REAL_BEGIN(name)
+#else
+#define TRAMP_KVM_BEGIN(name)
+#endif
+
+#define EXC_REAL_NONE(start, end)
+
+#define EXC_VIRT_NONE(start, end)
+
+
+#define EXC_REAL(name, start, end)				\
+	EXC_REAL_BEGIN(name, start, end);			\
+	STD_EXCEPTION_PSERIES(start, name##_common);			\
+	EXC_REAL_END(name, start, end);
+
+#define EXC_VIRT(name, start, end, realvec)			\
+	EXC_VIRT_BEGIN(name, start, end);			\
+	STD_RELON_EXCEPTION_PSERIES(start, realvec, name##_common);	\
+	EXC_VIRT_END(name, start, end);
+
+#define EXC_REAL_MASKABLE(name, start, end)			\
+	EXC_REAL_BEGIN(name, start, end);			\
+	MASKABLE_EXCEPTION_PSERIES(start, start, name##_common);	\
+	EXC_REAL_END(name, start, end);
+
+#define EXC_VIRT_MASKABLE(name, start, end, realvec)		\
+	EXC_VIRT_BEGIN(name, start, end);			\
+	MASKABLE_RELON_EXCEPTION_PSERIES(start, realvec, name##_common); \
+	EXC_VIRT_END(name, start, end);
+
+#define EXC_REAL_HV(name, start, end)			\
+	EXC_REAL_BEGIN(name, start, end);			\
+	STD_EXCEPTION_HV(start, start, name##_common);			\
+	EXC_REAL_END(name, start, end);
+
+#define EXC_VIRT_HV(name, start, end, realvec)		\
+	EXC_VIRT_BEGIN(name, start, end);			\
+	STD_RELON_EXCEPTION_HV(start, realvec, name##_common);		\
+	EXC_VIRT_END(name, start, end);
+
+#define __EXC_REAL_OOL(name, start, end)			\
+	EXC_REAL_BEGIN(name, start, end);			\
+	__OOL_EXCEPTION(start, label, tramp_real_##name);		\
+	EXC_REAL_END(name, start, end);
+
+#define __TRAMP_REAL_REAL_OOL(name, vec)				\
+	TRAMP_REAL_BEGIN(tramp_real_##name);				\
+	STD_EXCEPTION_PSERIES_OOL(vec, name##_common);			\
+
+#define __EXC_REAL_OOL_MASKABLE(name, start, end)		\
+	__EXC_REAL_OOL(name, start, end);
+
+#define __TRAMP_REAL_REAL_OOL_MASKABLE(name, vec)			\
+	TRAMP_REAL_BEGIN(tramp_real_##name);				\
+	MASKABLE_EXCEPTION_PSERIES_OOL(vec, name##_common);		\
+
+#define __EXC_REAL_OOL_HV_DIRECT(name, start, end, handler)	\
+	EXC_REAL_BEGIN(name, start, end);			\
+	__OOL_EXCEPTION(start, label, handler);				\
+	EXC_REAL_END(name, start, end);
+
+#define __EXC_REAL_OOL_HV(name, start, end)			\
+	__EXC_REAL_OOL(name, start, end);
+
+#define __TRAMP_REAL_REAL_OOL_HV(name, vec)				\
+	TRAMP_REAL_BEGIN(tramp_real_##name);				\
+	STD_EXCEPTION_HV_OOL(vec, name##_common);			\
+
+#define __EXC_REAL_OOL_MASKABLE_HV(name, start, end)		\
+	__EXC_REAL_OOL(name, start, end);
+
+#define __TRAMP_REAL_REAL_OOL_MASKABLE_HV(name, vec)			\
+	TRAMP_REAL_BEGIN(tramp_real_##name);				\
+	MASKABLE_EXCEPTION_HV_OOL(vec, name##_common);			\
+
+#define __EXC_VIRT_OOL(name, start, end)			\
+	EXC_VIRT_BEGIN(name, start, end);			\
+	__OOL_EXCEPTION(start, label, tramp_virt_##name);		\
+	EXC_VIRT_END(name, start, end);
+
+#define __TRAMP_REAL_VIRT_OOL(name, realvec)				\
+	TRAMP_REAL_BEGIN(tramp_virt_##name);				\
+	STD_RELON_EXCEPTION_PSERIES_OOL(realvec, name##_common);	\
+
+#define __EXC_VIRT_OOL_MASKABLE(name, start, end)		\
+	__EXC_VIRT_OOL(name, start, end);
+
+#define __TRAMP_REAL_VIRT_OOL_MASKABLE(name, realvec)		\
+	TRAMP_REAL_BEGIN(tramp_virt_##name);				\
+	MASKABLE_RELON_EXCEPTION_PSERIES_OOL(realvec, name##_common);	\
+
+#define __EXC_VIRT_OOL_HV(name, start, end)			\
+	__EXC_VIRT_OOL(name, start, end);
+
+#define __TRAMP_REAL_VIRT_OOL_HV(name, realvec)			\
+	TRAMP_REAL_BEGIN(tramp_virt_##name);				\
+	STD_RELON_EXCEPTION_HV_OOL(realvec, name##_common);		\
+
+#define __EXC_VIRT_OOL_MASKABLE_HV(name, start, end)		\
+	__EXC_VIRT_OOL(name, start, end);
+
+#define __TRAMP_REAL_VIRT_OOL_MASKABLE_HV(name, realvec)		\
+	TRAMP_REAL_BEGIN(tramp_virt_##name);				\
+	MASKABLE_RELON_EXCEPTION_HV_OOL(realvec, name##_common);	\
+
+#define TRAMP_KVM(area, n)						\
+	TRAMP_KVM_BEGIN(do_kvm_##n);					\
+	KVM_HANDLER(area, EXC_STD, n);					\
+
+#define TRAMP_KVM_SKIP(area, n)						\
+	TRAMP_KVM_BEGIN(do_kvm_##n);					\
+	KVM_HANDLER_SKIP(area, EXC_STD, n);				\
+
+#define TRAMP_KVM_HV(area, n)						\
+	TRAMP_KVM_BEGIN(do_kvm_H##n);					\
+	KVM_HANDLER(area, EXC_HV, n + 0x2);				\
+
+#define TRAMP_KVM_HV_SKIP(area, n)					\
+	TRAMP_KVM_BEGIN(do_kvm_H##n);					\
+	KVM_HANDLER_SKIP(area, EXC_HV, n + 0x2);			\
+
+#define EXC_COMMON(name, realvec, hdlr)				\
+	EXC_COMMON_BEGIN(name);					\
+	STD_EXCEPTION_COMMON(realvec, name, hdlr);			\
+
+#define EXC_COMMON_ASYNC(name, realvec, hdlr)			\
+	EXC_COMMON_BEGIN(name);					\
+	STD_EXCEPTION_COMMON_ASYNC(realvec, name, hdlr);		\
+
+#define EXC_COMMON_HV(name, realvec, hdlr)				\
+	EXC_COMMON_BEGIN(name);					\
+	STD_EXCEPTION_COMMON(realvec + 0x2, name, hdlr);		\
+
+#endif	/* _ASM_POWERPC_HEAD_64_H */