From ed5abf46b3c414ef58e647145f19b3966700b206 Mon Sep 17 00:00:00 2001 From: Alistair Francis Date: Mon, 20 Jan 2020 21:36:57 -0800 Subject: [PATCH] target/riscv: Correctly implement TSR trap As reported in: https://bugs.launchpad.net/qemu/+bug/1851939 we weren't correctly handling illegal instructions based on the value of MSTATUS_TSR and the current privledge level. This patch fixes the issue raised in the bug by raising an illegal instruction if TSR is set and we are in S-Mode. Signed-off-by: Alistair Francis Reviewed-by: Jonathan Behrens --- target/riscv/op_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index 8736f689c26..c6412f680c7 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -85,7 +85,7 @@ target_ulong helper_sret(CPURISCVState *env, target_ulong cpu_pc_deb) } if (env->priv_ver >= PRIV_VERSION_1_10_0 && - get_field(env->mstatus, MSTATUS_TSR)) { + get_field(env->mstatus, MSTATUS_TSR) && !(env->priv >= PRV_M)) { riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC()); } -- 2.39.5