From fb3f3730e405e2451dffc03c572037c2e0bd44c0 Mon Sep 17 00:00:00 2001 From: Mayuresh Chitale Date: Sun, 16 Oct 2022 18:17:24 +0530 Subject: [PATCH] target/riscv: generate virtual instruction exception This patch adds a mechanism to generate a virtual instruction instruction exception instead of an illegal instruction exception during instruction decode when virt is enabled. Signed-off-by: Mayuresh Chitale Reviewed-by: Weiwei Li Reviewed-by: Alistair Francis Message-Id: <20221016124726.102129-4-mchitale@ventanamicro.com> Signed-off-by: Alistair Francis --- target/riscv/translate.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/target/riscv/translate.c b/target/riscv/translate.c index db123da5ec..8b0bd38bb2 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -76,6 +76,7 @@ typedef struct DisasContext { to reset this known value. */ int frm; RISCVMXL ol; + bool virt_inst_excp; bool virt_enabled; const RISCVCPUConfig *cfg_ptr; bool hlsx; @@ -243,7 +244,11 @@ static void gen_exception_illegal(DisasContext *ctx) { tcg_gen_st_i32(tcg_constant_i32(ctx->opcode), cpu_env, offsetof(CPURISCVState, bins)); - generate_exception(ctx, RISCV_EXCP_ILLEGAL_INST); + if (ctx->virt_inst_excp) { + generate_exception(ctx, RISCV_EXCP_VIRT_INSTRUCTION_FAULT); + } else { + generate_exception(ctx, RISCV_EXCP_ILLEGAL_INST); + } } static void gen_exception_inst_addr_mis(DisasContext *ctx) @@ -1062,6 +1067,7 @@ static void decode_opc(CPURISCVState *env, DisasContext *ctx, uint16_t opcode) { has_XVentanaCondOps_p, decode_XVentanaCodeOps }, }; + ctx->virt_inst_excp = false; /* Check for compressed insn */ if (insn_len(opcode) == 2) { if (!has_ext(ctx, RVC)) {