sysdeps/unix/sysv/linux/x86_64/x32/sysdep.h

   1 /* Copyright (C) 2012-2024 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 */