syscall.h

/*
 * SPDX-License-Identifier: GPL-2.0
 *
 * Copyright (C) 2015 Dmitriy Cherkasov <dmitriy@mperpetuo.com>
 * Copyright (C) 2021 Philippe Gerum  <rpm@xenomai.org>
 */
 
#ifndef _COBALT_ARM64_SYSCALL_H
#define _COBALT_ARM64_SYSCALL_H
 
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm-generic/xenomai/syscall.h>
 
/*
 * Cobalt and Linux syscall numbers can be fetched from syscallno,
 * masking out the __COBALT_SYSCALL_BIT marker.
 */
#define __xn_reg_sys(__regs)    ((unsigned long)(__regs)->syscallno)
#define __xn_syscall_p(regs)    ((__xn_reg_sys(regs) & __COBALT_SYSCALL_BIT) != 0)
 
#ifdef CONFIG_XENO_ARCH_SYS3264
#define __xn_syscall(__regs)    __COBALT_SYSNR32emu(__xn_reg_sys(__regs)        \
                                    & ~__COBALT_SYSCALL_BIT)
#else
#define __xn_syscall(__regs)    ((unsigned long)(__xn_reg_sys(__regs) & ~__COBALT_SYSCALL_BIT))
#endif
 
#define __xn_reg_rval(__regs)   ((__regs)->regs[0])
#define __xn_reg_pc(__regs)     ((__regs)->pc)
#define __xn_reg_sp(__regs)     ((__regs)->sp)
 
/*
 * Root syscall number with predicate (valid only if
 * !__xn_syscall_p(__regs)).
 */
#define __xn_rootcall_p(__regs, __code)                 \
        ({                                              \
                *(__code) = __xn_reg_sys(__regs);       \
                *(__code) < NR_syscalls;                \
        })
 
static inline void __xn_error_return(struct pt_regs *regs, int v)
{
        __xn_reg_rval(regs) = v;
}
 
static inline void __xn_status_return(struct pt_regs *regs, long v)
{
        __xn_reg_rval(regs) = v;
}
 
static inline int __xn_interrupted_p(struct pt_regs *regs)
{
        return __xn_reg_rval(regs) == -EINTR;
}
 
#endif /* !_COBALT_ARM64_SYSCALL_H */