Re: [Qemu-devel] [PATCH v4 07/33] target-arm: add non-secure Translation Block flag

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Mon, Jun 30, 2014 at 06:09:07PM -0500, greg.bellows@linaro.org wrote:
> From: Sergey Fedorov <s.fedorov@samsung.com>
> 
> This patch is based on idea found in patch at
> git://github.com/jowinter/qemu-trustzone.git
> f3d955c6c0ed8c46bc0eb10b634201032a651dd2 by
> Johannes Winter <johannes.winter@iaik.tugraz.at>.
> 
> This flag prevents QEMU from executing TCG code generated for other CPU
> security state. It also allows to generate different TCG code depending on
> CPU secure state.
> 
> Signed-off-by: Sergey Fedorov <s.fedorov@samsung.com>
> Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
> Signed-off-by: Greg Bellows <greg.bellows@linaro.org>

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>


> ---
>  target-arm/cpu.h           | 10 ++++++++++
>  target-arm/translate-a64.c |  1 +
>  target-arm/translate.c     |  3 +++
>  target-arm/translate.h     |  1 +
>  4 files changed, 15 insertions(+)
> 
> diff --git a/target-arm/cpu.h b/target-arm/cpu.h
> index 1faf1e2..44e0943 100644
> --- a/target-arm/cpu.h
> +++ b/target-arm/cpu.h
> @@ -1291,6 +1291,8 @@ static inline int cpu_mmu_index (CPUARMState *env)
>  #define ARM_TBFLAG_BSWAP_CODE_MASK  (1 << ARM_TBFLAG_BSWAP_CODE_SHIFT)
>  #define ARM_TBFLAG_CPACR_FPEN_SHIFT 17
>  #define ARM_TBFLAG_CPACR_FPEN_MASK  (1 << ARM_TBFLAG_CPACR_FPEN_SHIFT)
> +#define ARM_TBFLAG_NS_SHIFT         18
> +#define ARM_TBFLAG_NS_MASK          (1 << ARM_TBFLAG_NS_SHIFT)
>  
>  /* Bit usage when in AArch64 state */
>  #define ARM_TBFLAG_AA64_EL_SHIFT    0
> @@ -1321,6 +1323,8 @@ static inline int cpu_mmu_index (CPUARMState *env)
>      (((F) & ARM_TBFLAG_AA64_EL_MASK) >> ARM_TBFLAG_AA64_EL_SHIFT)
>  #define ARM_TBFLAG_AA64_FPEN(F) \
>      (((F) & ARM_TBFLAG_AA64_FPEN_MASK) >> ARM_TBFLAG_AA64_FPEN_SHIFT)
> +#define ARM_TBFLAG_NS(F) \
> +    (((F) & ARM_TBFLAG_NS_MASK) >> ARM_TBFLAG_NS_SHIFT)
>  
>  static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
>                                          target_ulong *cs_base, int *flags)
> @@ -1334,6 +1338,9 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
>          if (fpen == 3 || (fpen == 1 && arm_current_pl(env) != 0)) {
>              *flags |= ARM_TBFLAG_AA64_FPEN_MASK;
>          }
> +        if (!arm_is_secure(env)) {
> +            *flags |= ARM_TBFLAG_NS_MASK;
> +        }
>      } else {
>          int privmode;
>          *pc = env->regs[15];
> @@ -1350,6 +1357,9 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
>          if (privmode) {
>              *flags |= ARM_TBFLAG_PRIV_MASK;
>          }
> +        if (!arm_is_secure(env)) {
> +            *flags |= ARM_TBFLAG_NS_MASK;
> +        }
>          if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30)
>              || arm_el_is_aa64(env, 1)) {
>              *flags |= ARM_TBFLAG_VFPEN_MASK;
> diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
> index 446d2cd..ad30903 100644
> --- a/target-arm/translate-a64.c
> +++ b/target-arm/translate-a64.c
> @@ -10879,6 +10879,7 @@ void gen_intermediate_code_internal_a64(ARMCPU *cpu,
>      dc->condexec_cond = 0;
>  #if !defined(CONFIG_USER_ONLY)
>      dc->user = (ARM_TBFLAG_AA64_EL(tb->flags) == 0);
> +    dc->ns = ARM_TBFLAG_NS(tb->flags);
>  #endif
>      dc->cpacr_fpen = ARM_TBFLAG_AA64_FPEN(tb->flags);
>      dc->vec_len = 0;
> diff --git a/target-arm/translate.c b/target-arm/translate.c
> index cf4e767..bf17952 100644
> --- a/target-arm/translate.c
> +++ b/target-arm/translate.c
> @@ -53,8 +53,10 @@ static uint32_t gen_opc_condexec_bits[OPC_BUF_SIZE];
>  
>  #if defined(CONFIG_USER_ONLY)
>  #define IS_USER(s) 1
> +#define IS_NS(s) 1
>  #else
>  #define IS_USER(s) (s->user)
> +#define IS_NS(s) (s->ns)
>  #endif
>  
>  TCGv_ptr cpu_env;
> @@ -10904,6 +10906,7 @@ static inline void gen_intermediate_code_internal(ARMCPU *cpu,
>      dc->condexec_cond = ARM_TBFLAG_CONDEXEC(tb->flags) >> 4;
>  #if !defined(CONFIG_USER_ONLY)
>      dc->user = (ARM_TBFLAG_PRIV(tb->flags) == 0);
> +    dc->ns = ARM_TBFLAG_NS(tb->flags);
>  #endif
>      dc->cpacr_fpen = ARM_TBFLAG_CPACR_FPEN(tb->flags);
>      dc->vfp_enabled = ARM_TBFLAG_VFPEN(tb->flags);
> diff --git a/target-arm/translate.h b/target-arm/translate.h
> index 31a0104..6e8620a 100644
> --- a/target-arm/translate.h
> +++ b/target-arm/translate.h
> @@ -19,6 +19,7 @@ typedef struct DisasContext {
>      int bswap_code;
>  #if !defined(CONFIG_USER_ONLY)
>      int user;
> +    int ns;
>  #endif
>      bool cpacr_fpen; /* FP enabled via CPACR.FPEN */
>      bool vfp_enabled; /* FP enabled via FPSCR.EN */
> -- 
> 1.8.3.2
>