Xenomai  3.1
syscall.h
1 /*
2  * Copyright (C) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.org>.
3  *
4  * ARM port
5  * Copyright (C) 2005 Stelian Pop
6  *
7  * Xenomai is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published
9  * by the Free Software Foundation; either version 2 of the License,
10  * or (at your option) any later version.
11  *
12  * Xenomai is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with Xenomai; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20  * 02111-1307, USA.
21  */
22 #ifndef _COBALT_ARM64_ASM_SYSCALL_H
23 #define _COBALT_ARM64_ASM_SYSCALL_H
24 
25 #include <linux/errno.h>
26 #include <linux/uaccess.h>
27 #include <asm/unistd.h>
28 #include <asm/ptrace.h>
29 #include <asm-generic/xenomai/syscall.h>
30 
31 /*
32  * Cobalt and Linux syscall numbers can be fetched from syscallno,
33  * masking out the __COBALT_SYSCALL_BIT marker.
34  */
35 #define __xn_reg_sys(__regs) ((unsigned long)(__regs)->syscallno)
36 #define __xn_syscall_p(regs) ((__xn_reg_sys(regs) & __COBALT_SYSCALL_BIT) != 0)
37 #define __xn_syscall(__regs) ((unsigned long)(__xn_reg_sys(__regs) & ~__COBALT_SYSCALL_BIT))
38 
39 #define __xn_reg_rval(__regs) ((__regs)->regs[0])
40 #define __xn_reg_arg1(__regs) ((__regs)->regs[0])
41 #define __xn_reg_arg2(__regs) ((__regs)->regs[1])
42 #define __xn_reg_arg3(__regs) ((__regs)->regs[2])
43 #define __xn_reg_arg4(__regs) ((__regs)->regs[3])
44 #define __xn_reg_arg5(__regs) ((__regs)->regs[4])
45 #define __xn_reg_pc(__regs) ((__regs)->pc)
46 #define __xn_reg_sp(__regs) ((__regs)->sp)
47 
48 /*
49  * Root syscall number with predicate (valid only if
50  * !__xn_syscall_p(__regs)).
51  */
52 #define __xn_rootcall_p(__regs, __code) \
53  ({ \
54  *(__code) = __xn_syscall(__regs); \
55  *(__code) < NR_syscalls; \
56  })
57 
58 static inline void __xn_error_return(struct pt_regs *regs, int v)
59 {
60  __xn_reg_rval(regs) = v;
61 }
62 
63 static inline void __xn_status_return(struct pt_regs *regs, long v)
64 {
65  __xn_reg_rval(regs) = v;
66 }
67 
68 static inline int __xn_interrupted_p(struct pt_regs *regs)
69 {
70  return __xn_reg_rval(regs) == -EINTR;
71 }
72 
73 int xnarch_local_syscall(unsigned long a1, unsigned long a2,
74  unsigned long a3, unsigned long a4,
75  unsigned long a5);
76 
77 #endif /* !_COBALT_ARM64_ASM_SYSCALL_H */