Generating a random number counts as I/O, as it cannot be
replayed and produce the same results.
Acked-by: David Gibson <da...@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lviv...@redhat.com>
Suggested-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
target/ppc/translate.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index b5217f632f..4a5de28036 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -1847,13 +1847,22 @@ static void gen_darn(DisasContext *ctx)
{
int l = L(ctx->opcode);
- if (l == 0) {
- gen_helper_darn32(cpu_gpr[rD(ctx->opcode)]);
- } else if (l <= 2) {
- /* Return 64-bit random for both CRN and RRN */
- gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]);
- } else {
+ if (l > 2) {
tcg_gen_movi_i64(cpu_gpr[rD(ctx->opcode)], -1);
+ } else {
+ if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
+ gen_io_start();
+ }
+ if (l == 0) {
+ gen_helper_darn32(cpu_gpr[rD(ctx->opcode)]);
+ } else {
+ /* Return 64-bit random for both CRN and RRN */
+ gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]);
+ }
+ if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
+ gen_io_end();
+ gen_stop_exception(ctx);
+ }
}
}
#endif
--
2.17.1
