[kvm-unit-tests PATCH v3 1/2] riscv: Add RV_INSN_LEN to processor.h

From: Jesse Taube <jesse@rivosinc.com>
To: kvm@vger.kernel.org, kvm-riscv@lists.infradead.org,
	linux-kselftest@vger.kernel.org
Cc: "Atish Patra" <atishp@atishpatra.org>,
	"Anup Patel" <anup@brainfault.org>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Clément Léger" <cleger@rivosinc.com>,
	"Himanshu Chauhan" <hchauhan@ventanamicro.com>,
	"Charlie Jenkins" <charlie@rivosinc.com>,
	"Jesse Taube" <jesse@rivosinc.com>,
	"Andrew Jones" <andrew.jones@linux.dev>
Subject: [kvm-unit-tests PATCH v3 1/2] riscv: Add RV_INSN_LEN to processor.h
Date: Thu,  5 Jun 2025 09:18:05 -0700	[thread overview]
Message-ID: <20250605161806.1206850-1-jesse@rivosinc.com> (raw)

When handeling traps and faults it is offten necessary to know the size
of the instruction at epc. Add RV_INSN_LEN to calculate the
instruction size.

Signed-off-by: Jesse Taube <jesse@rivosinc.com>
---
 lib/riscv/asm/processor.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/riscv/asm/processor.h b/lib/riscv/asm/processor.h
index 40104272..631ce226 100644
--- a/lib/riscv/asm/processor.h
+++ b/lib/riscv/asm/processor.h
@@ -7,6 +7,8 @@
 #define EXCEPTION_CAUSE_MAX	24
 #define INTERRUPT_CAUSE_MAX	16
 
+#define RV_INSN_LEN(insn)		((((insn) & 0x3) < 0x3) ? 2 : 4)
+
 typedef void (*exception_fn)(struct pt_regs *);
 
 struct thread_info {
-- 
2.43.0


-- 
kvm-riscv mailing list
kvm-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kvm-riscv
