| 1 | /* Copyright (C) 2012-2026 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 */ |