Re: [Qemu-devel] [PATCH v1 11/30] RISC-V: Split out mstatus_fs from tb_flags

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

On 05/22/2018 09:14 PM, Michael Clark wrote:
> From: Richard Henderson <richard.henderson@linaro.org>
> 
> Cc: Sagar Karandikar <sagark@eecs.berkeley.edu>
> Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
> Cc: Palmer Dabbelt <palmer@sifive.com>
> Cc: Alistair Francis <Alistair.Francis@wdc.com>
> Cc: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Michael Clark <mjc@sifive.com>
> Reviewed-by: Michael Clark <mjc@sifive.com>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> ---
>  target/riscv/cpu.h       |  6 +++---
>  target/riscv/translate.c | 10 +++++-----
>  2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
> index 3a3d91447736..242a8fcbe180 100644
> --- a/target/riscv/cpu.h
> +++ b/target/riscv/cpu.h
> @@ -276,8 +276,8 @@ void QEMU_NORETURN do_raise_exception_err(CPURISCVState *env,
>  target_ulong cpu_riscv_get_fflags(CPURISCVState *env);
>  void cpu_riscv_set_fflags(CPURISCVState *env, target_ulong);
>  
> -#define TB_FLAGS_MMU_MASK  3
> -#define TB_FLAGS_FP_ENABLE MSTATUS_FS
> +#define TB_FLAGS_MMU_MASK   3
> +#define TB_FLAGS_MSTATUS_FS MSTATUS_FS
>  
>  static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
>                                          target_ulong *cs_base, uint32_t *flags)
> @@ -285,7 +285,7 @@ static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
>      *pc = env->pc;
>      *cs_base = 0;
>  #ifdef CONFIG_USER_ONLY
> -    *flags = TB_FLAGS_FP_ENABLE;
> +    *flags = TB_FLAGS_MSTATUS_FS;
>  #else
>      *flags = cpu_mmu_index(env, 0) | (env->mstatus & MSTATUS_FS);
>  #endif
> diff --git a/target/riscv/translate.c b/target/riscv/translate.c
> index ee2bbc55b051..466b9551cbd9 100644
> --- a/target/riscv/translate.c
> +++ b/target/riscv/translate.c
> @@ -44,7 +44,7 @@ typedef struct DisasContext {
>      /* pc_succ_insn points to the instruction following base.pc_next */
>      target_ulong pc_succ_insn;
>      uint32_t opcode;
> -    uint32_t flags;
> +    uint32_t mstatus_fs;
>      uint32_t mem_idx;
>      /* Remember the rounding mode encoded in the previous fp instruction,
>         which we have already installed into env->fp_status.  Or -1 for
> @@ -656,7 +656,7 @@ static void gen_fp_load(DisasContext *ctx, uint32_t opc, int rd,
>  {
>      TCGv t0;
>  
> -    if (!(ctx->flags & TB_FLAGS_FP_ENABLE)) {
> +    if (ctx->mstatus_fs == 0) {
>          gen_exception_illegal(ctx);
>          return;
>      }
> @@ -686,7 +686,7 @@ static void gen_fp_store(DisasContext *ctx, uint32_t opc, int rs1,
>  {
>      TCGv t0;
>  
> -    if (!(ctx->flags & TB_FLAGS_FP_ENABLE)) {
> +    if (ctx->mstatus_fs == 0) {
>          gen_exception_illegal(ctx);
>          return;
>      }
> @@ -945,7 +945,7 @@ static void gen_fp_arith(DisasContext *ctx, uint32_t opc, int rd,
>  {
>      TCGv t0 = NULL;
>  
> -    if (!(ctx->flags & TB_FLAGS_FP_ENABLE)) {
> +    if (ctx->mstatus_fs == 0) {
>          goto do_illegal;
>      }
>  
> @@ -1810,8 +1810,8 @@ static void riscv_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
>      DisasContext *ctx = container_of(dcbase, DisasContext, base);
>  
>      ctx->pc_succ_insn = ctx->base.pc_first;
> -    ctx->flags = ctx->base.tb->flags;
>      ctx->mem_idx = ctx->base.tb->flags & TB_FLAGS_MMU_MASK;
> +    ctx->mstatus_fs = ctx->base.tb->flags & TB_FLAGS_MSTATUS_FS;
>      ctx->frm = -1;  /* unknown rounding mode */
>  }
>  
>