Re: [Qemu-devel] [PATCH] Fix processing of the MMU faults caused by the helper functions

["Pavel Dovgaluk" <Pavel.Dovgaluk@ispras.ru>]

Hello!

  Will anyone comment this patch?

Pavel Dovgaluk

> -----Original Message-----
> From: qemu-devel-bounces+pavel.dovgaluk=ispras.ru@nongnu.org [mailto:qemu-devel-
> bounces+pavel.dovgaluk=ispras.ru@nongnu.org] On Behalf Of Pavel Dovgaluk
> Sent: Monday, November 18, 2013 2:58 PM
> To: 'qemu-devel'
> Subject: [Qemu-devel] [PATCH] Fix processing of the MMU faults caused by the helper functions
> 
> MMU helper functions are called from generated code and other helper
> functions. In both cases they try to get function's return address for
> using it while restoring virtual CPU state.
> 
> When MMU helper is called from some other helper function
> (like helper_maskmov_xmm) through cpu_st* function, the return address
> will point to that helper. That is why CPU state cannot be restored in
> the case of MMU fault.
> 
> This patch introduces several inline helpers to load return address
> at the right place.
> 
> Signed-off-by: Pavel Dovgaluk <pavel.dovgaluk@gmail.com>
> ---
>  include/exec/exec-all.h         |   27 +++++++++++++++++++++++++++
>  include/exec/softmmu_header.h   |   32 ++++++++++++++++++++++++++++----
>  include/exec/softmmu_template.h |   18 ++++++++++++++++++
>  3 files changed, 73 insertions(+), 4 deletions(-)
> 
> diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
> index ea90b64..010c9ba 100644
> --- a/include/exec/exec-all.h
> +++ b/include/exec/exec-all.h
> @@ -338,6 +338,33 @@ uint16_t helper_ldw_cmmu(CPUArchState *env, target_ulong addr, int
> mmu_idx);
>  uint32_t helper_ldl_cmmu(CPUArchState *env, target_ulong addr, int mmu_idx);
>  uint64_t helper_ldq_cmmu(CPUArchState *env, target_ulong addr, int mmu_idx);
> 
> +uint8_t helper_call_ldb_cmmu(CPUArchState *env, target_ulong addr,
> +                             int mmu_idx, uintptr_t retaddr);
> +uint16_t helper_call_ldw_cmmu(CPUArchState *env, target_ulong addr,
> +                              int mmu_idx, uintptr_t retaddr);
> +uint32_t helper_call_ldl_cmmu(CPUArchState *env, target_ulong addr,
> +                              int mmu_idx, uintptr_t retaddr);
> +uint64_t helper_call_ldq_cmmu(CPUArchState *env, target_ulong addr,
> +                              int mmu_idx, uintptr_t retaddr);
> +
> +uint8_t helper_call_ldb_mmu(CPUArchState *env, target_ulong addr,
> +                            int mmu_idx, uintptr_t retaddr);
> +uint16_t helper_call_ldw_mmu(CPUArchState *env, target_ulong addr,
> +                             int mmu_idx, uintptr_t retaddr);
> +uint32_t helper_call_ldl_mmu(CPUArchState *env, target_ulong addr,
> +                             int mmu_idx, uintptr_t retaddr);
> +uint64_t helper_call_ldq_mmu(CPUArchState *env, target_ulong addr,
> +                             int mmu_idx, uintptr_t retaddr);
> +
> +void helper_call_stb_mmu(CPUArchState *env, target_ulong addr,
> +                         uint8_t val, int mmu_idx, uintptr_t retaddr);
> +void helper_call_stw_mmu(CPUArchState *env, target_ulong addr,
> +                         uint16_t val, int mmu_idx, uintptr_t retaddr);
> +void helper_call_stl_mmu(CPUArchState *env, target_ulong addr,
> +                         uint32_t val, int mmu_idx, uintptr_t retaddr);
> +void helper_call_stq_mmu(CPUArchState *env, target_ulong addr,
> +                         uint64_t val, int mmu_idx, uintptr_t retaddr);
> +
>  #define ACCESS_TYPE (NB_MMU_MODES + 1)
>  #define MEMSUFFIX _code
> 
> diff --git a/include/exec/softmmu_header.h b/include/exec/softmmu_header.h
> index d8d9c81..954b79e 100644
> --- a/include/exec/softmmu_header.h
> +++ b/include/exec/softmmu_header.h
> @@ -78,6 +78,17 @@
>  #define ADDR_READ addr_read
>  #endif
> 
> +/* inline helper ld function */
> +
> +static inline DATA_TYPE
> +glue(glue(helper_inline_ld, SUFFIX), MEMSUFFIX)(CPUArchState *env,
> +                                                target_ulong addr,
> +                                                int mmu_idx)
> +{
> +    return glue(glue(helper_call_ld, SUFFIX), MMUSUFFIX)(env, addr, mmu_idx,
> +                                                         GETRA());
> +}
> +
>  /* generic load/store macros */
> 
>  static inline RES_TYPE
> @@ -93,7 +104,8 @@ glue(glue(cpu_ld, USUFFIX), MEMSUFFIX)(CPUArchState *env, target_ulong ptr)
>      mmu_idx = CPU_MMU_INDEX;
>      if (unlikely(env->tlb_table[mmu_idx][page_index].ADDR_READ !=
>                   (addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))))) {
> -        res = glue(glue(helper_ld, SUFFIX), MMUSUFFIX)(env, addr, mmu_idx);
> +        res = glue(glue(helper_inline_ld, SUFFIX),
> +                   MEMSUFFIX)(env, addr, mmu_idx);
>      } else {
>          uintptr_t hostaddr = addr + env->tlb_table[mmu_idx][page_index].addend;
>          res = glue(glue(ld, USUFFIX), _raw)(hostaddr);
> @@ -114,8 +126,8 @@ glue(glue(cpu_lds, SUFFIX), MEMSUFFIX)(CPUArchState *env, target_ulong
> ptr)
>      mmu_idx = CPU_MMU_INDEX;
>      if (unlikely(env->tlb_table[mmu_idx][page_index].ADDR_READ !=
>                   (addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))))) {
> -        res = (DATA_STYPE)glue(glue(helper_ld, SUFFIX),
> -                               MMUSUFFIX)(env, addr, mmu_idx);
> +        res = (DATA_STYPE)glue(glue(helper_inline_ld, SUFFIX),
> +                               MEMSUFFIX)(env, addr, mmu_idx);
>      } else {
>          uintptr_t hostaddr = addr + env->tlb_table[mmu_idx][page_index].addend;
>          res = glue(glue(lds, SUFFIX), _raw)(hostaddr);
> @@ -126,6 +138,18 @@ glue(glue(cpu_lds, SUFFIX), MEMSUFFIX)(CPUArchState *env, target_ulong
> ptr)
> 
>  #if ACCESS_TYPE != (NB_MMU_MODES + 1)
> 
> +/* inline helper st function */
> +
> +static inline void
> +glue(glue(helper_inline_st, SUFFIX), MEMSUFFIX)(CPUArchState *env,
> +                                                target_ulong addr,
> +                                                DATA_TYPE val,
> +                                                int mmu_idx)
> +{
> +    glue(glue(helper_call_st, SUFFIX), MMUSUFFIX)(env, addr, val,
> +                                                  mmu_idx, GETRA());
> +}
> +
>  /* generic store macro */
> 
>  static inline void
> @@ -141,7 +165,7 @@ glue(glue(cpu_st, SUFFIX), MEMSUFFIX)(CPUArchState *env, target_ulong ptr,
>      mmu_idx = CPU_MMU_INDEX;
>      if (unlikely(env->tlb_table[mmu_idx][page_index].addr_write !=
>                   (addr & (TARGET_PAGE_MASK | (DATA_SIZE - 1))))) {
> -        glue(glue(helper_st, SUFFIX), MMUSUFFIX)(env, addr, v, mmu_idx);
> +        glue(glue(helper_inline_st, SUFFIX), MEMSUFFIX)(env, addr, v, mmu_idx);
>      } else {
>          uintptr_t hostaddr = addr + env->tlb_table[mmu_idx][page_index].addend;
>          glue(glue(st, SUFFIX), _raw)(hostaddr, v);
> diff --git a/include/exec/softmmu_template.h b/include/exec/softmmu_template.h
> index c6a5440..5ea6611 100644
> --- a/include/exec/softmmu_template.h
> +++ b/include/exec/softmmu_template.h
> @@ -298,6 +298,15 @@ glue(glue(helper_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong
> addr,
>      return helper_te_ld_name (env, addr, mmu_idx, GETRA());
>  }
> 
> +DATA_TYPE
> +glue(glue(helper_call_ld, SUFFIX), MMUSUFFIX)(CPUArchState *env,
> +                                              target_ulong addr,
> +                                              int mmu_idx,
> +                                              uintptr_t retaddr)
> +{
> +    return helper_te_ld_name(env, addr, mmu_idx, retaddr);
> +}
> +
>  #ifndef SOFTMMU_CODE_ACCESS
> 
>  /* Provide signed versions of the load routines as well.  We can of course
> @@ -491,6 +500,15 @@ glue(glue(helper_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong
> addr,
>      helper_te_st_name(env, addr, val, mmu_idx, GETRA());
>  }
> 
> +void
> +glue(glue(helper_call_st, SUFFIX), MMUSUFFIX)(CPUArchState *env,
> +                                              target_ulong addr,
> +                                              DATA_TYPE val, int mmu_idx,
> +                                              uintptr_t retaddr)
> +{
> +    helper_te_st_name(env, addr, val, mmu_idx, retaddr);
> +}
> +
>  #endif /* !defined(SOFTMMU_CODE_ACCESS) */
> 
>  #undef READ_ACCESS_TYPE
> 
>