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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
* Copyright 2010 Tilera Corporation. All Rights Reserved.
* Copyright 2015 Regents of the University of California, Berkeley
*
* See asm-generic/syscall.h for descriptions of what we must do here.
*/
#ifndef _ASM_RISCV_SYSCALL_H
#define _ASM_RISCV_SYSCALL_H
#include <asm/hwprobe.h>
#include <uapi/linux/audit.h>
#include <linux/sched.h>
#include <linux/err.h>
/* The array of function pointers for syscalls. */
extern void * const sys_call_table[];
extern void * const compat_sys_call_table[];
/*
* Only the low 32 bits of orig_r0 are meaningful, so we return int.
* This importantly ignores the high bits on 64-bit, so comparisons
* sign-extend the low 32 bits.
*/
static inline int syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
return regs->a7;
}
static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
regs->a0 = regs->orig_a0;
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
unsigned long error = regs->a0;
return IS_ERR_VALUE(error) ? error : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->a0;
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
regs->a0 = (long) error ?: val;
}
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned long *args)
{
args[0] = regs->orig_a0;
args++;
memcpy(args, ®s->a1, 5 * sizeof(args[0]));
}
static inline int syscall_get_arch(struct task_struct *task)
{
#ifdef CONFIG_64BIT
return AUDIT_ARCH_RISCV64;
#else
return AUDIT_ARCH_RISCV32;
#endif
}
typedef long (*syscall_t)(const struct pt_regs *);
static inline void syscall_handler(struct pt_regs *regs, ulong syscall)
{
syscall_t fn;
#ifdef CONFIG_COMPAT
if ((regs->status & SR_UXL) == SR_UXL_32)
fn = compat_sys_call_table[syscall];
else
#endif
fn = sys_call_table[syscall];
regs->a0 = fn(regs);
}
static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
{
return false;
}
asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
asmlinkage long sys_riscv_hwprobe(struct riscv_hwprobe *, size_t, size_t,
unsigned long *, unsigned int);
#endif /* _ASM_RISCV_SYSCALL_H */
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