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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*/
#ifndef _ASM_ARC_SYSCALL_H
#define _ASM_ARC_SYSCALL_H 1
#include <uapi/linux/audit.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <asm/unistd.h>
#include <asm/ptrace.h> /* in_syscall() */
extern void *sys_call_table[];
static inline long
syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
if (user_mode(regs) && in_syscall(regs))
return regs->r8;
else
return -1;
}
static inline void
syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
{
/*
* Unlike syscall_get_nr(), syscall_set_nr() can be called only when
* the target task is stopped for tracing on entering syscall, so
* there is no need to have the same check syscall_get_nr() has.
*/
regs->r8 = nr;
}
static inline void
syscall_rollback(struct task_struct *task, struct pt_regs *regs)
{
regs->r0 = regs->orig_r0;
}
static inline long
syscall_get_error(struct task_struct *task, struct pt_regs *regs)
{
/* 0 if syscall succeeded, otherwise -Errorcode */
return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
}
static inline long
syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
{
return regs->r0;
}
static inline void
syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
int error, long val)
{
regs->r0 = (long) error ?: val;
}
/*
* @i: argument index [0,5]
* @n: number of arguments; n+i must be [1,6].
*/
static inline void
syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
unsigned long *args)
{
unsigned long *inside_ptregs = &(regs->r0);
unsigned int n = 6;
unsigned int i = 0;
while (n--) {
args[i++] = (*inside_ptregs);
inside_ptregs--;
}
}
static inline void
syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
unsigned long *args)
{
unsigned long *inside_ptregs = ®s->r0;
unsigned int n = 6;
unsigned int i = 0;
while (n--) {
*inside_ptregs = args[i++];
inside_ptregs--;
}
}
static inline int
syscall_get_arch(struct task_struct *task)
{
return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
: (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
}
#endif
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