1 /* Copyright (C) 2012-2022 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 */ 65