| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1991-2015 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 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <sysdeps/generic/sysdep.h> |
| 19 | |
| 20 | #include <sys/syscall.h> |
| 21 | #define HAVE_SYSCALLS |
| 22 | |
| 23 | /* Note that using a `PASTE' macro loses. */ |
| 24 | #define SYSCALL__(name, args) PSEUDO (__##name, name, args) |
| 25 | #define SYSCALL(name, args) PSEUDO (name, name, args) |
| 26 | |
| 27 | /* Cancellation macros. */ |
| 28 | #define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,n,...) n |
| 29 | #define __SYSCALL_NARGS(...) \ |
| 30 | __SYSCALL_NARGS_X (__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0,) |
| 31 | |
| 32 | #define SYSCALL_CANCEL(name, ...) \ |
| 33 | ({ \ |
| 34 | long int sc_ret; \ |
| 35 | if (SINGLE_THREAD_P) \ |
| 36 | sc_ret = INLINE_SYSCALL (name, __SYSCALL_NARGS(__VA_ARGS__), \ |
| 37 | __VA_ARGS__); \ |
| 38 | else \ |
| 39 | { \ |
| 40 | int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \ |
| 41 | sc_ret = INLINE_SYSCALL (name, __SYSCALL_NARGS (__VA_ARGS__), \ |
| 42 | __VA_ARGS__); \ |
| 43 | LIBC_CANCEL_RESET (sc_cancel_oldtype); \ |
| 44 | } \ |
| 45 | sc_ret; \ |
| 46 | }) |
| 47 | |
| 48 | /* Machine-dependent sysdep.h files are expected to define the macro |
| 49 | PSEUDO (function_name, syscall_name) to emit assembly code to define the |
| 50 | C-callable function FUNCTION_NAME to do system call SYSCALL_NAME. |
| 51 | r0 and r1 are the system call outputs. MOVE(x, y) should be defined as |
| 52 | an instruction such that "MOVE(r1, r0)" works. ret should be defined |
| 53 | as the return instruction. */ |
| 54 | |
| 55 | #ifndef SYS_ify |
| 56 | #define SYS_ify(syscall_name) SYS_##syscall_name |
| 57 | #endif |
| 58 | |
| 59 | /* Terminate a system call named SYM. This is used on some platforms |
| 60 | to generate correct debugging information. */ |
| 61 | #ifndef PSEUDO_END |
| 62 | #define PSEUDO_END(sym) |
| 63 | #endif |
| 64 | #ifndef PSEUDO_END_NOERRNO |
| 65 | #define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym) |
| 66 | #endif |
| 67 | #ifndef PSEUDO_END_ERRVAL |
| 68 | #define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym) |
| 69 | #endif |
| 70 | |
| 71 | /* Wrappers around system calls should normally inline the system call code. |
| 72 | But sometimes it is not possible or implemented and we use this code. */ |
| 73 | #ifndef INLINE_SYSCALL |
| 74 | #define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args) |
| 75 | #endif |