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e33a23fbe8
This patch adds two new macros for internal and inline syscall to use
within GLIBC: INTERNAL_SYSCALL_CALL and INLINE_SYSCALL_CALL. They are
similar to the old INTERNAL_SYSCALL and INLINE_SYSCALL with the difference
the new macros accept a variable argument call and do not require to pass
the expected argument size.
The advantage is it is possible to use variable argument macros like
SYSCALL_LL{64} without the need to also handle the argument size. So
for an ABI where SYSCALL_LL might split the argument in high and low
parts, instead of:
INTERNAL_SYSCALL_DECL (err);
#if ...
INTERNAL_SYSCALL (syscall, err, 2, SYSCALL_LL (len));
#else
INTERNAL_SYSCALL (syscall, err, 1, SYSCALL_LL (len));
#endif
It will be just:
INTERNAL_SYSCALL_CALL (syscall, err, SYSCALL_LL (len));
The INLINE_SYSCALL_CALL follows the same semanthic regarding the argument
and is similar to INLINE_SYSCALL regarding setting errno.
Checked with a build for x86_64, i386, aach64, armhf, powerpc64le, powerpc32,
and mips32. No code generation changed.
* sysdeps/unix/sysdep.h (__INTERNAL_SYSCALL0): New macro.
(__INTERNAL_SYSCALL1): Likewise.
(__INTERNAL_SYSCALL2): Likewise.
(__INTERNAL_SYSCALL3): Likewise.
(__INTERNAL_SYSCALL4): Likewise.
(__INTERNAL_SYSCALL5): Likewise.
(__INTERNAL_SYSCALL6): Likewise.
(__INTERNAL_SYSCALL7): Likewise.
(__INTERNAL_SYSCALL_NARGS_X): Likewise.
(__INTERNAL_SYSCALL_NARGS): Likewise.
(__INTERNAL_SYSCALL_DISP): Likewise.
(INTERNAL_SYSCALL_CALL): Likewise.
(__SYSCALL0): Rename to __INLINE_SYSCALL0.
(__SYSCALL1): Rename to __INLINE_SYSCALL1.
(__SYSCALL2): Rename to __INLINE_SYSCALL2.
(__SYSCALL3): Rename to __INLINE_SYSCALL3.
(__SYSCALL4): Rename to __INLINE_SYSCALL4.
(__SYSCALL5): Rename to __INLINE_SYSCALL5.
(__SYSCALL6): Rename to __INLINE_SYSCALL6.
(__SYSCALL7): Rename to __INLINE_SYSCALL7.
(__SYSCALL_NARGS_X): Rename to __INLINE_SYSCALL_NARGS_X.
(__SYSCALL_NARGS): Rename to __INLINE_SYSCALL_NARGS.
(__SYSCALL_DISP): Rename to __INLINE_SYSCALL_DISP.
(__SYSCALL_CALL): Rename to INLINE_SYSCALL_CALL.
(SYSCALL_CANCEL): Replace __SYSCALL_CALL with INLINE_SYSCALL_CALL.
133 lines
5.3 KiB
C
133 lines
5.3 KiB
C
/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/generic/sysdep.h>
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#include <sys/syscall.h>
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#define HAVE_SYSCALLS
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/* Note that using a `PASTE' macro loses. */
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#define SYSCALL__(name, args) PSEUDO (__##name, name, args)
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#define SYSCALL(name, args) PSEUDO (name, name, args)
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#define __SYSCALL_CONCAT_X(a,b) a##b
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#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b)
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#define __INTERNAL_SYSCALL0(name, err) \
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INTERNAL_SYSCALL (name, err, 0)
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#define __INTERNAL_SYSCALL1(name, err, a1) \
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INTERNAL_SYSCALL (name, err, 1, a1)
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#define __INTERNAL_SYSCALL2(name, err, a1, a2) \
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INTERNAL_SYSCALL (name, err, 2, a1, a2)
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#define __INTERNAL_SYSCALL3(name, err, a1, a2, a3) \
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INTERNAL_SYSCALL (name, err, 3, a1, a2, a3)
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#define __INTERNAL_SYSCALL4(name, err, a1, a2, a3, a4) \
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INTERNAL_SYSCALL (name, err, 4, a1, a2, a3, a4)
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#define __INTERNAL_SYSCALL5(name, err, a1, a2, a3, a4, a5) \
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INTERNAL_SYSCALL (name, err, 5, a1, a2, a3, a4, a5)
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#define __INTERNAL_SYSCALL6(name, err, a1, a2, a3, a4, a5, a6) \
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INTERNAL_SYSCALL (name, err, 6, a1, a2, a3, a4, a5, a6)
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#define __INTERNAL_SYSCALL7(name, err, a1, a2, a3, a4, a5, a6, a7) \
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INTERNAL_SYSCALL (name, err, 7, a1, a2, a3, a4, a5, a6, a7)
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#define __INTERNAL_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,o,...) o
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#define __INTERNAL_SYSCALL_NARGS(...) \
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__INTERNAL_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
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#define __INTERNAL_SYSCALL_DISP(b,...) \
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__SYSCALL_CONCAT (b,__INTERNAL_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
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/* Issue a syscall defined by syscall number plus any other argument required.
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It is similar to INTERNAL_SYSCALL macro, but without the need to pass the
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expected argument number as second parameter. */
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#define INTERNAL_SYSCALL_CALL(...) \
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__INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL, __VA_ARGS__)
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#define __INLINE_SYSCALL0(name) \
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INLINE_SYSCALL (name, 0)
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#define __INLINE_SYSCALL1(name, a1) \
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INLINE_SYSCALL (name, 1, a1)
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#define __INLINE_SYSCALL2(name, a1, a2) \
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INLINE_SYSCALL (name, 2, a1, a2)
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#define __INLINE_SYSCALL3(name, a1, a2, a3) \
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INLINE_SYSCALL (name, 3, a1, a2, a3)
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#define __INLINE_SYSCALL4(name, a1, a2, a3, a4) \
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INLINE_SYSCALL (name, 4, a1, a2, a3, a4)
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#define __INLINE_SYSCALL5(name, a1, a2, a3, a4, a5) \
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INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5)
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#define __INLINE_SYSCALL6(name, a1, a2, a3, a4, a5, a6) \
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INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6)
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#define __INLINE_SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \
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INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7)
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#define __INLINE_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
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#define __INLINE_SYSCALL_NARGS(...) \
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__INLINE_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
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#define __INLINE_SYSCALL_DISP(b,...) \
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__SYSCALL_CONCAT (b,__INLINE_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
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/* Issue a syscall defined by syscall number plus any other argument
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required. Any error will be handled using arch defined macros and errno
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will be set accordingly.
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It is similar to INLINE_SYSCALL macro, but without the need to pass the
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expected argument number as second parameter. */
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#define INLINE_SYSCALL_CALL(...) \
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__INLINE_SYSCALL_DISP (__INLINE_SYSCALL, __VA_ARGS__)
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#define SYSCALL_CANCEL(...) \
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({ \
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long int sc_ret; \
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if (SINGLE_THREAD_P) \
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sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
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else \
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{ \
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int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \
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sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
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LIBC_CANCEL_RESET (sc_cancel_oldtype); \
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} \
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sc_ret; \
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})
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/* Machine-dependent sysdep.h files are expected to define the macro
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PSEUDO (function_name, syscall_name) to emit assembly code to define the
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C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
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r0 and r1 are the system call outputs. MOVE(x, y) should be defined as
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an instruction such that "MOVE(r1, r0)" works. ret should be defined
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as the return instruction. */
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#ifndef SYS_ify
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#define SYS_ify(syscall_name) SYS_##syscall_name
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#endif
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/* Terminate a system call named SYM. This is used on some platforms
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to generate correct debugging information. */
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#ifndef PSEUDO_END
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#define PSEUDO_END(sym)
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#endif
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#ifndef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
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#endif
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#ifndef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym)
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#endif
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/* Wrappers around system calls should normally inline the system call code.
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But sometimes it is not possible or implemented and we use this code. */
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#ifndef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)
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#endif
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