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target/ppc: Use gen_io_start/end around DARN

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Generating a random number counts as I/O, as it cannot be
replayed and produce the same results.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-05-10 10:00:52 -07:00
parent de39064567
commit 7e4357f612
1 changed files with 15 additions and 6 deletions
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15
target/ppc/translate.c
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@ -1847,13 +1847,22 @@ static void gen_darn(DisasContext *ctx)
{
int l = L(ctx->opcode);
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 if (l <= 2) {
} else {
/* Return 64-bit random for both CRN and RRN */
gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]);
} else {
tcg_gen_movi_i64(cpu_gpr[rD(ctx->opcode)], -1);
}
if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
gen_io_end();
gen_stop_exception(ctx);
}
}
}
#endif