libsanitizer/sanitizer_common/sanitizer_linux_x86_64.S

   1 // This file is dual licensed under the MIT and the University of Illinois Open
   2 // Source Licenses. See LICENSE.TXT for details.
   3
   4 // Avoid being marked as needing an executable stack:
   5 #if defined(__linux__) && defined(__ELF__)
   6 .section .note.GNU-stack,"",%progbits
   7 #endif
   8
   9 // Further contents are x86_64-only:
  10 #if defined(__linux__) && defined(__x86_64__)
  11
  12 #include "../builtins/assembly.h"
  13
  14 // If the "naked" function attribute were supported for x86 we could
  15 // do this via inline asm.
  16 .text
  17 .balign 4
  18 DEFINE_COMPILERRT_FUNCTION(internal_sigreturn)
  19         mov           $0xf,             %eax    // 0xf == SYS_rt_sigreturn
  20         mov           %rcx,             %r10
  21         syscall
  22         ret                                     // Won't normally reach here.
  23 END_COMPILERRT_FUNCTION(internal_sigreturn)
  24
  25 #endif // defined(__linux__) && defined(__x86_64__)