Xenomai  3.0.8
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_ARM_ASM_SYSCALL_H
23 #define _COBALT_ARM_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 #ifndef __ARM_NR_ipipe
32 /* Legacy pipelines do not define this. */
33 #define __ARM_NR_ipipe (__NR_SYSCALL_BASE + XENO_ARM_SYSCALL)
34 #endif
35 
36 #define __xn_reg_sys(__regs) ((__regs)->ARM_ORIG_r0)
37 /* In OABI_COMPAT mode, handle both OABI and EABI userspace syscalls */
38 #ifdef CONFIG_OABI_COMPAT
39 #define __xn_syscall_p(__regs) (((__regs)->ARM_r7 == __NR_OABI_SYSCALL_BASE + XENO_ARM_SYSCALL) || \
40  ((__regs)->ARM_r7 == __ARM_NR_ipipe))
41 #define __xn_abi_decode(__regs) ((__regs)->ARM_r7 - __NR_OABI_SYSCALL_BASE)
42 #else /* !CONFIG_OABI_COMPAT */
43 #define __xn_syscall_p(__regs) ((__regs)->ARM_r7 == __ARM_NR_ipipe)
44 #define __xn_abi_decode(__regs) ((__regs)->ARM_r7)
45 #endif /* !CONFIG_OABI_COMPAT */
46 #define __xn_syscall(__regs) (__xn_reg_sys(__regs) & ~__COBALT_SYSCALL_BIT)
47 
48 /*
49  * Returns the syscall number depending on the handling core. Cobalt
50  * syscall numbers can be fetched from ARM_ORIG_r0 with ARM_r7
51  * containing the Xenomai syscall marker, Linux syscalls directly from
52  * ARM_r7 (may require the OABI tweak).
53  */
54 static inline long __xn_get_syscall_nr(struct pt_regs *regs)
55 {
56  return __xn_syscall_p(regs) ? __xn_reg_sys(regs) : __xn_abi_decode(regs);
57 }
58 
59 #define __xn_reg_rval(__regs) ((__regs)->ARM_r0)
60 #define __xn_reg_arg1(__regs) ((__regs)->ARM_r1)
61 #define __xn_reg_arg2(__regs) ((__regs)->ARM_r2)
62 #define __xn_reg_arg3(__regs) ((__regs)->ARM_r3)
63 #define __xn_reg_arg4(__regs) ((__regs)->ARM_r4)
64 #define __xn_reg_arg5(__regs) ((__regs)->ARM_r5)
65 #define __xn_reg_pc(__regs) ((__regs)->ARM_ip)
66 #define __xn_reg_sp(__regs) ((__regs)->ARM_sp)
67 
68 static inline void __xn_error_return(struct pt_regs *regs, int v)
69 {
70  __xn_reg_rval(regs) = v;
71 }
72 
73 static inline void __xn_status_return(struct pt_regs *regs, long v)
74 {
75  __xn_reg_rval(regs) = v;
76 }
77 
78 static inline int __xn_interrupted_p(struct pt_regs *regs)
79 {
80  return __xn_reg_rval(regs) == -EINTR;
81 }
82 
83 int xnarch_local_syscall(unsigned long a1, unsigned long a2,
84  unsigned long a3, unsigned long a4,
85  unsigned long a5);
86 
87 #endif /* !_COBALT_ARM_ASM_SYSCALL_H */