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

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
   4 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   5 * Copyright 2015 Regents of the University of California, Berkeley
   6 *
   7 * See asm-generic/syscall.h for descriptions of what we must do here.
   8 */
   9
  10#ifndef _ASM_RISCV_SYSCALL_H
  11#define _ASM_RISCV_SYSCALL_H
  12
  13#include <uapi/linux/audit.h>
  14#include <linux/sched.h>
  15#include <linux/err.h>
  16
  17/* The array of function pointers for syscalls. */
  18extern void *sys_call_table[];
  19
  20/*
  21 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
  22 * This importantly ignores the high bits on 64-bit, so comparisons
  23 * sign-extend the low 32 bits.
  24 */
  25static inline int syscall_get_nr(struct task_struct *task,
  26                                 struct pt_regs *regs)
  27{
  28        return regs->a7;
  29}
  30
  31static inline void syscall_rollback(struct task_struct *task,
  32                                    struct pt_regs *regs)
  33{
  34        regs->a0 = regs->orig_a0;
  35}
  36
  37static inline long syscall_get_error(struct task_struct *task,
  38                                     struct pt_regs *regs)
  39{
  40        unsigned long error = regs->a0;
  41
  42        return IS_ERR_VALUE(error) ? error : 0;
  43}
  44
  45static inline long syscall_get_return_value(struct task_struct *task,
  46                                            struct pt_regs *regs)
  47{
  48        return regs->a0;
  49}
  50
  51static inline void syscall_set_return_value(struct task_struct *task,
  52                                            struct pt_regs *regs,
  53                                            int error, long val)
  54{
  55        regs->a0 = (long) error ?: val;
  56}
  57
  58static inline void syscall_get_arguments(struct task_struct *task,
  59                                         struct pt_regs *regs,
  60                                         unsigned long *args)
  61{
  62        args[0] = regs->orig_a0;
  63        args++;
  64        memcpy(args, &regs->a1, 5 * sizeof(args[0]));
  65}
  66
  67static inline void syscall_set_arguments(struct task_struct *task,
  68                                         struct pt_regs *regs,
  69                                         const unsigned long *args)
  70{
  71        regs->orig_a0 = args[0];
  72        args++;
  73        memcpy(&regs->a1, args, 5 * sizeof(regs->a1));
  74}
  75
  76static inline int syscall_get_arch(struct task_struct *task)
  77{
  78#ifdef CONFIG_64BIT
  79        return AUDIT_ARCH_RISCV64;
  80#else
  81        return AUDIT_ARCH_RISCV32;
  82#endif
  83}
  84
  85#endif  /* _ASM_RISCV_SYSCALL_H */
  86