Re: [Qemu-devel] [PATCH 3/5] cpu-exec: Rename cpu_resume_from_signal() to cpu_loop_exit_noexc()

[Sergey Fedorov <serge.fdrv@gmail.com>]

On 16/05/16 19:09, Peter Maydell wrote:
> The function cpu_resume_from_signal() is now always called with a
> NULL puc argument, and is rather misnamed since it is never called
> from a signal handler. It is essentially forcing an exit to the
> top level cpu loop but without raising any exception, so rename
> it to cpu_loop_exit_noexc() and drop the useless unused argument.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org>

> ---
>  cpu-exec-common.c        | 6 ++----
>  exec.c                   | 2 +-
>  hw/i386/kvmvapic.c       | 2 +-
>  include/exec/exec-all.h  | 2 +-
>  target-i386/bpt_helper.c | 2 +-
>  target-lm32/helper.c     | 2 +-
>  target-s390x/helper.c    | 2 +-
>  target-xtensa/helper.c   | 2 +-
>  translate-all.c          | 4 ++--
>  user-exec.c              | 2 +-
>  10 files changed, 12 insertions(+), 14 deletions(-)
>
> diff --git a/cpu-exec-common.c b/cpu-exec-common.c
> index 62f5d6b..fac3aa7 100644
> --- a/cpu-exec-common.c
> +++ b/cpu-exec-common.c
> @@ -25,10 +25,8 @@
>  bool exit_request;
>  CPUState *tcg_current_cpu;
>  
> -/* exit the current TB from a signal handler. The host registers are
> -   restored in a state compatible with the CPU emulator
> - */
> -void cpu_resume_from_signal(CPUState *cpu, void *puc)
> +/* exit the current TB, but without causing any exception to be raised */
> +void cpu_loop_exit_noexc(CPUState *cpu)
>  {
>      /* XXX: restore cpu registers saved in host registers */
>  
> diff --git a/exec.c b/exec.c
> index ee45472..c5c97ac 100644
> --- a/exec.c
> +++ b/exec.c
> @@ -2121,7 +2121,7 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
>                  } else {
>                      cpu_get_tb_cpu_state(env, &pc, &cs_base, &cpu_flags);
>                      tb_gen_code(cpu, pc, cs_base, cpu_flags, 1);
> -                    cpu_resume_from_signal(cpu, NULL);
> +                    cpu_loop_exit_noexc(cpu);
>                  }
>              }
>          } else {
> diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c
> index f14445d..ee2f3fa 100644
> --- a/hw/i386/kvmvapic.c
> +++ b/hw/i386/kvmvapic.c
> @@ -447,7 +447,7 @@ static void patch_instruction(VAPICROMState *s, X86CPU *cpu, target_ulong ip)
>  
>      if (!kvm_enabled()) {
>          tb_gen_code(cs, current_pc, current_cs_base, current_flags, 1);
> -        cpu_resume_from_signal(cs, NULL);
> +        cpu_loop_exit_noexc(cs);
>      }
>  }
>  
> diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
> index 85528f9..1359f14 100644
> --- a/include/exec/exec-all.h
> +++ b/include/exec/exec-all.h
> @@ -73,7 +73,7 @@ void restore_state_to_opc(CPUArchState *env, struct TranslationBlock *tb,
>  void cpu_gen_init(void);
>  bool cpu_restore_state(CPUState *cpu, uintptr_t searched_pc);
>  
> -void QEMU_NORETURN cpu_resume_from_signal(CPUState *cpu, void *puc);
> +void QEMU_NORETURN cpu_loop_exit_noexc(CPUState *cpu);
>  void QEMU_NORETURN cpu_io_recompile(CPUState *cpu, uintptr_t retaddr);
>  TranslationBlock *tb_gen_code(CPUState *cpu,
>                                target_ulong pc, target_ulong cs_base,
> diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c
> index f47df19..458170e 100644
> --- a/target-i386/bpt_helper.c
> +++ b/target-i386/bpt_helper.c
> @@ -217,7 +217,7 @@ void breakpoint_handler(CPUState *cs)
>              if (check_hw_breakpoints(env, false)) {
>                  raise_exception(env, EXCP01_DB);
>              } else {
> -                cpu_resume_from_signal(cs, NULL);
> +                cpu_loop_exit_noexc(cs);
>              }
>          }
>      } else {
> diff --git a/target-lm32/helper.c b/target-lm32/helper.c
> index 655248f..accfa7c 100644
> --- a/target-lm32/helper.c
> +++ b/target-lm32/helper.c
> @@ -140,7 +140,7 @@ void lm32_debug_excp_handler(CPUState *cs)
>              if (check_watchpoints(env)) {
>                  raise_exception(env, EXCP_WATCHPOINT);
>              } else {
> -                cpu_resume_from_signal(cs, NULL);
> +                cpu_loop_exit_noexc(cs);
>              }
>          }
>      } else {
> diff --git a/target-s390x/helper.c b/target-s390x/helper.c
> index 92abe7e..f1e0a43 100644
> --- a/target-s390x/helper.c
> +++ b/target-s390x/helper.c
> @@ -686,7 +686,7 @@ void s390x_cpu_debug_excp_handler(CPUState *cs)
>             will be triggered, it will call load_psw which will recompute
>             the watchpoints.  */
>          cpu_watchpoint_remove_all(cs, BP_CPU);
> -        cpu_resume_from_signal(cs, NULL);
> +        cpu_loop_exit_noexc(cs);
>      }
>  }
>  #endif /* CONFIG_USER_ONLY */
> diff --git a/target-xtensa/helper.c b/target-xtensa/helper.c
> index 839f4a7..768b32c 100644
> --- a/target-xtensa/helper.c
> +++ b/target-xtensa/helper.c
> @@ -108,7 +108,7 @@ void xtensa_breakpoint_handler(CPUState *cs)
>              if (cause) {
>                  debug_exception_env(env, cause);
>              }
> -            cpu_resume_from_signal(cs, NULL);
> +            cpu_loop_exit_noexc(cs);
>          }
>      }
>  }
> diff --git a/translate-all.c b/translate-all.c
> index 52a571e..3a0d10f 100644
> --- a/translate-all.c
> +++ b/translate-all.c
> @@ -1394,7 +1394,7 @@ void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,
>             modifying the memory. It will ensure that it cannot modify
>             itself */
>          tb_gen_code(cpu, current_pc, current_cs_base, current_flags, 1);
> -        cpu_resume_from_signal(cpu, NULL);
> +        cpu_loop_exit_noexc(cpu);
>      }
>  #endif
>  }
> @@ -1654,7 +1654,7 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr)
>         repeating the fault, which is horribly inefficient.
>         Better would be to execute just this insn uncached, or generate a
>         second new TB.  */
> -    cpu_resume_from_signal(cpu, NULL);
> +    cpu_loop_exit_noexc(cpu);
>  }
>  
>  void tb_flush_jmp_cache(CPUState *cpu, target_ulong addr)
> diff --git a/user-exec.c b/user-exec.c
> index 1d02e24..40b5e7c 100644
> --- a/user-exec.c
> +++ b/user-exec.c
> @@ -73,7 +73,7 @@ static void cpu_exit_tb_from_sighandler(CPUState *cpu, void *puc)
>      sigprocmask(SIG_SETMASK, &uc->sc_mask, NULL);
>  #endif
>  
> -    cpu_resume_from_signal(cpu, NULL);
> +    cpu_loop_exit_noexc(cpu);
>  }
>  
>  /* 'pc' is the host PC at which the exception was raised. 'address' is