Subject: [kvm-unit-tests PATCH v5 22/29] powerpc: Fix emulator illegal instruction test for powernv

From: Nicholas Piggin <[email-masked]>
Date: Sat, 16 Dec 2023 23:42:49 +1000

Illegal instructions cause 0xe40 (HEAI) interrupts rather
than program interrupts.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 powerpc/emulator.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/powerpc/emulator.c b/powerpc/emulator.c
index 39dd5964..035a903c 100644
--- a/powerpc/emulator.c
+++ b/powerpc/emulator.c
@@ -31,6 +31,20 @@ static void program_check_handler(struct pt_regs *regs, void *opaque)
 	regs->nip += 4;
 }
 
+static void heai_handler(struct pt_regs *regs, void *opaque)
+{
+	int *data = opaque;
+
+	if (verbose) {
+		printf("Detected invalid instruction %#018lx: %08x\n",
+		       regs->nip, *(uint32_t*)regs->nip);
+	}
+
+	*data = 8; /* Illegal instruction */
+
+	regs->nip += 4;
+}
+
 static void alignment_handler(struct pt_regs *regs, void *opaque)
 {
 	int *data = opaque;
@@ -362,7 +376,10 @@ int main(int argc, char **argv)
 {
 	int i;
 
-	handle_exception(0x700, program_check_handler, (void *)&is_invalid);
+	if (machine_is_powernv())
+		handle_exception(0xe40, heai_handler, (void *)&is_invalid);
+	else
+		handle_exception(0x700, program_check_handler, (void *)&is_invalid);
 	handle_exception(0x600, alignment_handler, (void *)&alignment);
 
 	for (i = 1; i < argc; i++) {
-- 
2.42.0