LXR linux/arch/nios2/include/asm/syscall.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright Altera Corporation (C) <2014>. All rights reserved
   4 */
   5
   6#ifndef __ASM_NIOS2_SYSCALL_H__
   7#define __ASM_NIOS2_SYSCALL_H__
   8
   9#include <uapi/linux/audit.h>
  10#include <linux/err.h>
  11#include <linux/sched.h>
  12
  13static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
  14{
  15        return regs->r2;
  16}
  17
  18static inline void syscall_rollback(struct task_struct *task,
  19                                struct pt_regs *regs)
  20{
  21        regs->r2 = regs->orig_r2;
  22        regs->r7 = regs->orig_r7;
  23}
  24
  25static inline long syscall_get_error(struct task_struct *task,
  26                                struct pt_regs *regs)
  27{
  28        return regs->r7 ? regs->r2 : 0;
  29}
  30
  31static inline long syscall_get_return_value(struct task_struct *task,
  32        struct pt_regs *regs)
  33{
  34        return regs->r2;
  35}
  36
  37static inline void syscall_set_return_value(struct task_struct *task,
  38        struct pt_regs *regs, int error, long val)
  39{
  40        if (error) {
  41                /* error < 0, but nios2 uses > 0 return value */
  42                regs->r2 = -error;
  43                regs->r7 = 1;
  44        } else {
  45                regs->r2 = val;
  46                regs->r7 = 0;
  47        }
  48}
  49
  50static inline void syscall_get_arguments(struct task_struct *task,
  51        struct pt_regs *regs, unsigned long *args)
  52{
  53        *args++ = regs->r4;
  54        *args++ = regs->r5;
  55        *args++ = regs->r6;
  56        *args++ = regs->r7;
  57        *args++ = regs->r8;
  58        *args   = regs->r9;
  59}
  60
  61static inline void syscall_set_arguments(struct task_struct *task,
  62        struct pt_regs *regs, const unsigned long *args)
  63{
  64        regs->r4 = *args++;
  65        regs->r5 = *args++;
  66        regs->r6 = *args++;
  67        regs->r7 = *args++;
  68        regs->r8 = *args++;
  69        regs->r9 = *args;
  70}
  71
  72static inline int syscall_get_arch(struct task_struct *task)
  73{
  74        return AUDIT_ARCH_NIOS2;
  75}
  76
  77#endif
  78