[PATCH] configure: Check for "struct esr_context" used on ARM64

[André Hentschel]

Am 09.04.20 um 23:42 schrieb Martin Storsjo:
> If not found, use the old codepath from before
> 85c01202ac70af0c83f894d7a8986adf66983459.
> 
> Signed-off-by: Martin Storsjo <martin at martin.st>
> ---
>  configure.ac              |  3 +++
>  dlls/ntdll/signal_arm64.c | 27 ++++++++++++++++++++++++++-
>  2 files changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/configure.ac b/configure.ac
> index f30e8b92b0..199139697e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -2448,6 +2448,9 @@ AC_CHECK_MEMBERS([scsireq_t.cmd, sg_io_hdr_t.interface_id],,,
>  dnl Check for siginfo_t members
>  AC_CHECK_MEMBERS([siginfo_t.si_fd],,,[#include <signal.h>])
>  
> +dnl Check for esr_context members
> +AC_CHECK_MEMBERS([struct esr_context.esr],,,[#include <signal.h>])
> +
>  dnl Check for struct mtget members
>  AC_CHECK_MEMBERS([struct mtget.mt_blksiz, struct mtget.mt_gstat, struct mtget.mt_blkno],,,
>  [#include <sys/types.h>
> diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
> index 5fffd45f7b..f6157ba04f 100644
> --- a/dlls/ntdll/signal_arm64.c
> +++ b/dlls/ntdll/signal_arm64.c
> @@ -101,12 +101,14 @@ static struct fpsimd_context *get_fpsimd_context( ucontext_t *sigcontext )
>      return (struct fpsimd_context *)get_extended_sigcontext( sigcontext, FPSIMD_MAGIC );
>  }
>  
> +#ifdef HAVE_STRUCT_ESR_CONTEXT_ESR
>  static DWORD64 get_fault_esr( ucontext_t *sigcontext )
>  {
>      struct esr_context *esr = (struct esr_context *)get_extended_sigcontext( sigcontext, ESR_MAGIC );
>      if (esr) return esr->esr;
>      return 0;
>  }
> +#endif
>  
>  #endif /* linux */
>  
> @@ -1027,6 +1029,28 @@ static void setup_raise_exception( ucontext_t *sigcontext, struct stack_layout *
>      REGn_sig(18, sigcontext) = (ULONG_PTR)NtCurrentTeb();
>  }
>  
> +static inline DWORD is_write_fault( DWORD *pc, ucontext_t *sigcontext )
> +{
> +#ifdef HAVE_STRUCT_ESR_CONTEXT_ESR
> +    return (get_fault_esr( sigcontext ) & 0x40) != 0 ?
> +        EXCEPTION_WRITE_FAULT : EXCEPTION_READ_FAULT;
> +#else
> +    DWORD inst = *pc;
> +    if ((inst & 0xbfff0000) == 0x0c000000   /* C3.3.1 */ ||
> +        (inst & 0xbfe00000) == 0x0c800000   /* C3.3.2 */ ||
> +        (inst & 0xbfdf0000) == 0x0d000000   /* C3.3.3 */ ||
> +        (inst & 0xbfc00000) == 0x0d800000   /* C3.3.4 */ ||
> +        (inst & 0x3f400000) == 0x08000000   /* C3.3.6 */ ||
> +        (inst & 0x3bc00000) == 0x38000000   /* C3.3.8-12 */ ||
> +        (inst & 0x3fe00000) == 0x3c800000   /* C3.3.8-12 128bit */ ||
> +        (inst & 0x3bc00000) == 0x39000000   /* C3.3.13 */ ||
> +        (inst & 0x3fc00000) == 0x3d800000   /* C3.3.13 128bit */ ||
> +        (inst & 0x3a400000) == 0x28000000)  /* C3.3.7,14-16 */
> +        return EXCEPTION_WRITE_FAULT;
> +    return EXCEPTION_READ_FAULT;
> +#endif
> +}
> +
>  /**********************************************************************
>   *		segv_handler
>   *
> @@ -1036,6 +1060,7 @@ static void segv_handler( int signal, siginfo_t *info, void *ucontext )
>  {
>      struct stack_layout *stack;
>      ucontext_t *context = ucontext;
> +    DWORD *orig_pc = (DWORD *)PC_sig(context);
>  
>      /* check for page fault inside the thread stack */
>      if (signal == SIGSEGV)
> @@ -1061,7 +1086,7 @@ static void segv_handler( int signal, siginfo_t *info, void *ucontext )
>          break;
>      case SIGSEGV:  /* Segmentation fault */
>          stack->rec.NumberParameters = 2;
> -        stack->rec.ExceptionInformation[0] = (get_fault_esr( context ) & 0x40) != 0;
> +        stack->rec.ExceptionInformation[0] = is_write_fault( orig_pc, context );
>          stack->rec.ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
>          if (!(stack->rec.ExceptionCode = virtual_handle_fault( (void *)stack->rec.ExceptionInformation[1],
>                                                           stack->rec.ExceptionInformation[0], FALSE )))
> 

Signed-off-by: André Hentschel <nerv at dawncrow.de>