[compiler-rt] r266295 - [sanitizer] [SystemZ] Implement internal_mmap.

[Kostya Serebryany via llvm-commits]

I'd prefer if you could move this and similar pieces of code into
separate SystemZ-specific
file(s).
The sanitizer run-time is already a hairy ball of #ifdefs, let's try not to
make it worse.

On Thu, Apr 14, 2016 at 5:51 AM, Marcin Koscielnicki via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Author: koriakin
> Date: Thu Apr 14 07:51:45 2016
> New Revision: 266295
>
> URL: http://llvm.org/viewvc/llvm-project?rev=266295&view=rev
> Log:
> [sanitizer] [SystemZ] Implement internal_mmap.
>
> mmap on s390 is quite a special snowflake: since it has too many
> parameters to pass them in registers, it passes a pointer to a struct
> with all the parameters instead.
>
> Differential Revision: http://reviews.llvm.org/D18889
>
> Modified:
>     compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc
>
> Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc
> URL:
> http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc?rev=266295&r1=266294&r2=266295&view=diff
>
> ==============================================================================
> --- compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc (original)
> +++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc Thu Apr 14
> 07:51:45 2016
> @@ -112,7 +112,32 @@ namespace __sanitizer {
>  // --------------- sanitizer_libc.h
>  uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
>                     OFF_T offset) {
> -#if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
> +#ifdef __s390__
> +  struct s390_mmap_params {
> +    unsigned long addr;
> +    unsigned long length;
> +    unsigned long prot;
> +    unsigned long flags;
> +    unsigned long fd;
> +    unsigned long offset;
> +  } params = {
> +    (unsigned long)addr,
> +    (unsigned long)length,
> +    (unsigned long)prot,
> +    (unsigned long)flags,
> +    (unsigned long)fd,
> +# ifdef __s390x__
> +    (unsigned long)offset,
> +# else
> +    (unsigned long)(offset / 4096),
> +# endif
> +  };
> +# ifdef __s390x__
> +  return internal_syscall(SYSCALL(mmap), &params);
> +# else
> +  return internal_syscall(SYSCALL(mmap2), &params);
> +# endif
> +#elif SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
>    return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags,
> fd,
>                            offset);
>  #else
>
>
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