/*
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* Copyright (C) 2001,2002,2003,2004 Philippe Gerum <rpm@xenomai.org>.
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*
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* ARM port
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* Copyright (C) 2005 Stelian Pop
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*
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* Xenomai is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* Xenomai is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Xenomai; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef _COBALT_ARM_DOVETAIL_SYSCALL_H
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#define _COBALT_ARM_DOVETAIL_SYSCALL_H
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#include <linux/errno.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/ptrace.h>
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#include <asm-generic/xenomai/syscall.h>
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/*
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* Cobalt syscall numbers can be fetched from ARM_ORIG_r0 with ARM_r7
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* containing the Xenomai syscall marker, Linux syscalls directly from
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* ARM_r7. Since we have to work with Dovetail whilst remaining binary
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* compatible with applications built for the I-pipe, we retain the
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* old syscall signature based on receiving XENO_ARM_SYSCALL in
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* ARM_r7, possibly ORed with __COBALT_SYSCALL_BIT by Dovetail
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* (IPIPE_COMPAT mode).
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*
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* FIXME: We also have __COBALT_SYSCALL_BIT (equal to
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* __OOB_SYSCALL_BIT) present in the actual syscall number in r0,
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* which is pretty much useless. Oh, well... When support for the
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* I-pipe is dropped, we may switch back to the regular convention
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* Dovetail abides by, with the actual syscall number into r7 ORed
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* with __OOB_SYSCALL_BIT, freeing r0 for passing a call argument.
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*/
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#define __xn_reg_sys(__regs) ((__regs)->ARM_ORIG_r0)
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#define __xn_syscall_p(__regs) (((__regs)->ARM_r7 & ~__COBALT_SYSCALL_BIT) == XENO_ARM_SYSCALL)
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#define __xn_syscall(__regs) (__xn_reg_sys(__regs) & ~__COBALT_SYSCALL_BIT)
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/*
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* Root syscall number with predicate (valid only if
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* !__xn_syscall_p(__regs)).
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*/
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#define __xn_rootcall_p(__regs, __code) \
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({ \
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*(__code) = (__regs)->ARM_r7; \
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*(__code) < NR_syscalls || *(__code) >= __ARM_NR_BASE; \
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})
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#define __xn_reg_rval(__regs) ((__regs)->ARM_r0)
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#define __xn_reg_pc(__regs) ((__regs)->ARM_ip)
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#define __xn_reg_sp(__regs) ((__regs)->ARM_sp)
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static inline void __xn_error_return(struct pt_regs *regs, int v)
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{
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__xn_reg_rval(regs) = v;
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}
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static inline void __xn_status_return(struct pt_regs *regs, long v)
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{
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__xn_reg_rval(regs) = v;
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}
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static inline int __xn_interrupted_p(struct pt_regs *regs)
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{
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return __xn_reg_rval(regs) == -EINTR;
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}
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static inline
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int xnarch_local_syscall(unsigned long a1, unsigned long a2,
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unsigned long a3, unsigned long a4,
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unsigned long a5)
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{
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/* We need none of these with Dovetail. */
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return -ENOSYS;
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}
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#define pipeline_get_syscall_args pipeline_get_syscall_args
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static inline void pipeline_get_syscall_args(struct task_struct *task,
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struct pt_regs *regs,
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unsigned long *args)
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{
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args[0] = regs->ARM_r1;
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args[1] = regs->ARM_r2;
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args[2] = regs->ARM_r3;
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args[3] = regs->ARM_r4;
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args[4] = regs->ARM_r5;
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}
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#endif /* !_COBALT_ARM_DOVETAIL_SYSCALL_H */
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