[PATCH v3 01/27] arm64: Add a facility to turn an ESR syndrome into a sysreg encoding

[Marc Zyngier]

It is often useful to compare an ESR syndrome reporting the trapping
of a system register with a value matching that system register.

Since encoding both the sysreg and the ESR version seem to be a bit
overkill, let's add a set of macros that convert an ESR value into
the corresponding sysreg encoding.

We handle both AArch32 and AArch64, taking advantage of identical
encodings between system registers and CP15 accessors.

Tested-by: Alexander Graf <agraf at suse.de>
Acked-by: David Daney <david.daney at cavium.com>
Acked-by: Mark Rutland <mark.rutland at arm.com>
Acked-by: Catalin Marinas <catalin.marinas at arm.com>
Reviewed-by: Eric Auger <eric.auger at redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
 arch/arm64/include/asm/esr.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
index 85997c0e5443..e7d8e281ff62 100644
--- a/arch/arm64/include/asm/esr.h
+++ b/arch/arm64/include/asm/esr.h
@@ -19,6 +19,7 @@
 #define __ASM_ESR_H
 
 #include <asm/memory.h>
+#include <asm/sysreg.h>
 
 #define ESR_ELx_EC_UNKNOWN	(0x00)
 #define ESR_ELx_EC_WFx		(0x01)
@@ -181,6 +182,29 @@
 #define ESR_ELx_SYS64_ISS_SYS_CNTFRQ	(ESR_ELx_SYS64_ISS_SYS_VAL(3, 3, 0, 14, 0) | \
 					 ESR_ELx_SYS64_ISS_DIR_READ)
 
+#define esr_sys64_to_sysreg(e)					\
+	sys_reg((((e) & ESR_ELx_SYS64_ISS_OP0_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_OP0_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_OP1_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_OP1_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_CRN_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_CRN_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_CRM_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_CRM_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_OP2_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_OP2_SHIFT))
+
+#define esr_cp15_to_sysreg(e)					\
+	sys_reg(3,						\
+		(((e) & ESR_ELx_SYS64_ISS_OP1_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_OP1_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_CRN_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_CRN_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_CRM_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_CRM_SHIFT),			\
+		(((e) & ESR_ELx_SYS64_ISS_OP2_MASK) >>		\
+		 ESR_ELx_SYS64_ISS_OP2_SHIFT))
+
 #ifndef __ASSEMBLY__
 #include <asm/types.h>
 
-- 
2.11.0