1  /* Copyright (C) 2012-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #ifndef _LINUX_X32_SYSDEP_H
      19  #define _LINUX_X32_SYSDEP_H 1
      20  
      21  /* There is some commonality.  */
      22  #include <sysdeps/unix/sysv/linux/x86_64/sysdep.h>
      23  #include <sysdeps/x86_64/x32/sysdep.h>
      24  
      25  /* How to pass the off{64}_t argument on p{readv,writev}{64}.  */
      26  #undef LO_HI_LONG
      27  #define LO_HI_LONG(val) (val)
      28  
      29  #ifdef __ASSEMBLER__
      30  /* Zero-extend 32-bit unsigned long int arguments to 64 bits.  */
      31  # undef ZERO_EXTEND_1
      32  # define ZERO_EXTEND_1 movl %edi, %edi;
      33  # undef ZERO_EXTEND_2
      34  # define ZERO_EXTEND_2 movl %esi, %esi;
      35  # undef ZERO_EXTEND_3
      36  # define ZERO_EXTEND_3 movl %edx, %edx;
      37  # if SYSCALL_ULONG_ARG_1 == 4 || SYSCALL_ULONG_ARG_2 == 4
      38  #  undef DOARGS_4
      39  #  define DOARGS_4 movl %ecx, %r10d;
      40  # else
      41  #  undef ZERO_EXTEND_4
      42  #  define ZERO_EXTEND_4 movl %r10d, %r10d;
      43  # endif
      44  # undef ZERO_EXTEND_5
      45  # define ZERO_EXTEND_5 movl %r8d, %r8d;
      46  # undef ZERO_EXTEND_6
      47  # define ZERO_EXTEND_6 movl %r9d, %r9d;
      48  #else /* !__ASSEMBLER__ */
      49  # undef ARGIFY
      50  /* Enforce zero-extension for pointers and array system call arguments.
      51     For integer types, extend to int64_t (the full register) using a
      52     regular cast, resulting in zero or sign extension based on the
      53     signedness of the original type.  */
      54  # define ARGIFY(X) \
      55   ({									\
      56      _Pragma ("GCC diagnostic push");					\
      57      _Pragma ("GCC diagnostic ignored \"-Wpointer-to-int-cast\"");	\
      58      (__builtin_classify_type (X) == 5					\
      59       ? (uintptr_t) (X) : (int64_t) (X));				\
      60      _Pragma ("GCC diagnostic pop");					\
      61    })
      62  #endif	/* __ASSEMBLER__ */
      63  
      64  #endif /* linux/x86_64/x32/sysdep.h */