C++ (Cpp) local_do_mprotect_NO_NOTIFYの例

コード例 #1

ファイル: aspacemgr-common.c プロジェクト: svn2github/valgrind-3

VgStack* VG_(am_alloc_VgStack)( /*OUT*/Addr* initial_sp )
{
   Int      szB;
   SysRes   sres;
   VgStack* stack;
   UInt*    p;
   Int      i;

   /* Allocate the stack. */
   szB = VG_STACK_GUARD_SZB 
         + VG_STACK_ACTIVE_SZB + VG_STACK_GUARD_SZB;

#if !defined(VGPV_ppc64_linux_bgq)
   sres = VG_(am_mmap_anon_float_valgrind)( szB );
   if (sr_isError(sres))
      return NULL;

   stack = (VgStack*)(AddrH)sr_Res(sres);

   aspacem_assert(VG_IS_PAGE_ALIGNED(szB));
   aspacem_assert(VG_IS_PAGE_ALIGNED(stack));

   /* Protect the guard areas. */
   sres = local_do_mprotect_NO_NOTIFY( 
             (Addr) &stack[0], 
             VG_STACK_GUARD_SZB, VKI_PROT_NONE 
          );
   if (sr_isError(sres)) goto protect_failed;
   VG_(am_notify_mprotect)( 
      (Addr) &stack->bytes[0], 
      VG_STACK_GUARD_SZB, VKI_PROT_NONE 
   );

   sres = local_do_mprotect_NO_NOTIFY( 
             (Addr) &stack->bytes[VG_STACK_GUARD_SZB + VG_STACK_ACTIVE_SZB], 
             VG_STACK_GUARD_SZB, VKI_PROT_NONE 
          );
   if (sr_isError(sres)) goto protect_failed;
   VG_(am_notify_mprotect)( 
      (Addr) &stack->bytes[VG_STACK_GUARD_SZB + VG_STACK_ACTIVE_SZB],
      VG_STACK_GUARD_SZB, VKI_PROT_NONE 
   );
#else
   { sres = VG_(am_mmap_anon_float_valgrind)( szB );
     if (sr_isError(sres))
        return NULL;
     stack = (VgStack*)sr_Res(sres);
   }
#endif

   /* Looks good.  Fill the active area with junk so we can later
      tell how much got used. */

   p = (UInt*)&stack->bytes[VG_STACK_GUARD_SZB];
   for (i = 0; i < VG_STACK_ACTIVE_SZB/sizeof(UInt); i++)
      p[i] = 0xDEADBEEF;

   *initial_sp = (Addr)&stack->bytes[VG_STACK_GUARD_SZB + VG_STACK_ACTIVE_SZB];
   *initial_sp -= 8;
   *initial_sp &= ~((Addr)0x1F); /* 32-align it */

   VG_(debugLog)( 1,"aspacem","allocated thread stack at 0x%llx size %d\n",
                  (ULong)(Addr)stack, szB);
   ML_(am_do_sanity_check)();
   return stack;

  protect_failed:
   /* The stack was allocated, but we can't protect it.  Unmap it and
      return NULL (failure). */
   (void)ML_(am_do_munmap_NO_NOTIFY)( (Addr)stack, szB );
   ML_(am_do_sanity_check)();
   return NULL;
}

コード例 #2

ファイル: aspacemgr-common.c プロジェクト: qtekfun/htcDesire820Kernel

VgStack* VG_(am_alloc_VgStack)( Addr* initial_sp )
{
   Int      szB;
   SysRes   sres;
   VgStack* stack;
   UInt*    p;
   Int      i;

   
   szB = VG_STACK_GUARD_SZB 
         + VG_STACK_ACTIVE_SZB + VG_STACK_GUARD_SZB;

   sres = VG_(am_mmap_anon_float_valgrind)( szB );
   if (sr_isError(sres))
      return NULL;

   stack = (VgStack*)(AddrH)sr_Res(sres);

   aspacem_assert(VG_IS_PAGE_ALIGNED(szB));
   aspacem_assert(VG_IS_PAGE_ALIGNED(stack));

   
   sres = local_do_mprotect_NO_NOTIFY( 
             (Addr) &stack[0], 
             VG_STACK_GUARD_SZB, VKI_PROT_NONE 
          );
   if (sr_isError(sres)) goto protect_failed;
   VG_(am_notify_mprotect)( 
      (Addr) &stack->bytes[0], 
      VG_STACK_GUARD_SZB, VKI_PROT_NONE 
   );

   sres = local_do_mprotect_NO_NOTIFY( 
             (Addr) &stack->bytes[VG_STACK_GUARD_SZB + VG_STACK_ACTIVE_SZB], 
             VG_STACK_GUARD_SZB, VKI_PROT_NONE 
          );
   if (sr_isError(sres)) goto protect_failed;
   VG_(am_notify_mprotect)( 
      (Addr) &stack->bytes[VG_STACK_GUARD_SZB + VG_STACK_ACTIVE_SZB],
      VG_STACK_GUARD_SZB, VKI_PROT_NONE 
   );


   p = (UInt*)&stack->bytes[VG_STACK_GUARD_SZB];
   for (i = 0; i < VG_STACK_ACTIVE_SZB/sizeof(UInt); i++)
      p[i] = 0xDEADBEEF;

   *initial_sp = (Addr)&stack->bytes[VG_STACK_GUARD_SZB + VG_STACK_ACTIVE_SZB];
   *initial_sp -= 8;
   *initial_sp &= ~((Addr)0x1F); 

   VG_(debugLog)( 1,"aspacem","allocated thread stack at 0x%llx size %d\n",
                  (ULong)(Addr)stack, szB);
   ML_(am_do_sanity_check)();
   return stack;

  protect_failed:
   (void)ML_(am_do_munmap_NO_NOTIFY)( (Addr)stack, szB );
   ML_(am_do_sanity_check)();
   return NULL;
}