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Diffstat (limited to 'sysdeps/unix/syscall-template.S')
| -rw-r--r-- | sysdeps/unix/syscall-template.S | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/sysdeps/unix/syscall-template.S b/sysdeps/unix/syscall-template.S deleted file mode 100644 index 4993ff562d..0000000000 --- a/sysdeps/unix/syscall-template.S +++ /dev/null @@ -1,90 +0,0 @@ -/* Assembly code template for system call stubs. - Copyright (C) 2009-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -/* The real guts of this work are in the macros defined in the - machine- and kernel-specific sysdep.h header file. When we - are defining a cancellable system call, the sysdep-cancel.h - versions of those macros are what we really use. - - Each system call's object is built by a rule in sysd-syscalls - generated by make-syscalls.sh that #include's this file after - defining a few macros: - SYSCALL_NAME syscall name - SYSCALL_NARGS number of arguments this call takes - SYSCALL_SYMBOL primary symbol name - SYSCALL_CANCELLABLE 1 if the call is a cancelation point - SYSCALL_NOERRNO 1 to define a no-errno version (see below) - SYSCALL_ERRVAL 1 to define an error-value version (see below) - - We used to simply pipe the correct three lines below through cpp into - the assembler. The main reason to have this file instead is so that - stub objects can be assembled with -g and get source line information - that leads a user back to a source file and these fine comments. The - average user otherwise has a hard time knowing which "syscall-like" - functions in libc are plain stubs and which have nontrivial C wrappers. - Some versions of the "plain" stub generation macros are more than a few - instructions long and the untrained eye might not distinguish them from - some compiled code that inexplicably lacks source line information. */ - -#if SYSCALL_CANCELLABLE -# include <sysdep-cancel.h> -#else -# include <sysdep.h> -#endif - -/* This indirection is needed so that SYMBOL gets macro-expanded. */ -#define syscall_hidden_def(SYMBOL) hidden_def (SYMBOL) - -#define T_PSEUDO(SYMBOL, NAME, N) PSEUDO (SYMBOL, NAME, N) -#define T_PSEUDO_NOERRNO(SYMBOL, NAME, N) PSEUDO_NOERRNO (SYMBOL, NAME, N) -#define T_PSEUDO_ERRVAL(SYMBOL, NAME, N) PSEUDO_ERRVAL (SYMBOL, NAME, N) -#define T_PSEUDO_END(SYMBOL) PSEUDO_END (SYMBOL) -#define T_PSEUDO_END_NOERRNO(SYMBOL) PSEUDO_END_NOERRNO (SYMBOL) -#define T_PSEUDO_END_ERRVAL(SYMBOL) PSEUDO_END_ERRVAL (SYMBOL) - -#if SYSCALL_NOERRNO - -/* This kind of system call stub never returns an error. - We return the return value register to the caller unexamined. */ - -T_PSEUDO_NOERRNO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) - ret_NOERRNO -T_PSEUDO_END_NOERRNO (SYSCALL_SYMBOL) - -#elif SYSCALL_ERRVAL - -/* This kind of system call stub returns the errno code as its return - value, or zero for success. We may massage the kernel's return value - to meet that ABI, but we never set errno here. */ - -T_PSEUDO_ERRVAL (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) - ret_ERRVAL -T_PSEUDO_END_ERRVAL (SYSCALL_SYMBOL) - -#else - -/* This is a "normal" system call stub: if there is an error, - it returns -1 and sets errno. */ - -T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS) - ret -T_PSEUDO_END (SYSCALL_SYMBOL) - -#endif - -syscall_hidden_def (SYSCALL_SYMBOL) |