[mirror_ubuntu-jammy-kernel.git] / arch / riscv / include / asm / syscall.h

/* 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 <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[];

/*
 * 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, &regs->a1, 5 * sizeof(args[0]));
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 const unsigned long *args)
{
	regs->orig_a0 = args[0];
	args++;
	memcpy(&regs->a1, args, 5 * sizeof(regs->a1));
}

static inline int syscall_get_arch(struct task_struct *task)
{
#ifdef CONFIG_64BIT
	return AUDIT_ARCH_RISCV64;
#else
	return AUDIT_ARCH_RISCV32;
#endif
}

asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
#endif	/* _ASM_RISCV_SYSCALL_H */
Commit	Line	Data
50acfb2b	1	/* SPDX-License-Identifier: GPL-2.0-only */
e2c0cdfb PD	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	*
e2c0cdfb PD	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
efe75c49	13	#include <uapi/linux/audit.h>
e2c0cdfb PD	14	#include <linux/sched.h>
	15	#include <linux/err.h>
	16
	17	/* The array of function pointers for syscalls. */
e6a30224	18	extern void * const sys_call_table[];
e2c0cdfb PD	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	*/
	25	static inline int syscall_get_nr(struct task_struct *task,
	26	struct pt_regs *regs)
	27	{
	28	return regs->a7;
	29	}
	30
e2c0cdfb PD	31	static inline void syscall_rollback(struct task_struct *task,
	32	struct pt_regs *regs)
	33	{
	34	regs->a0 = regs->orig_a0;
	35	}
	36
	37	static 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
	45	static inline long syscall_get_return_value(struct task_struct *task,
	46	struct pt_regs *regs)
	47	{
	48	return regs->a0;
	49	}
	50
	51	static 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
	58	static inline void syscall_get_arguments(struct task_struct *task,
	59	struct pt_regs *regs,
e2c0cdfb PD	60	unsigned long *args)
e2c0cdfb PD	61	{
b35f549d SRRH	62	args[0] = regs->orig_a0;
	63	args++;
	64	memcpy(args, &regs->a1, 5 * sizeof(args[0]));
e2c0cdfb PD	65	}
	66
	67	static inline void syscall_set_arguments(struct task_struct *task,
	68	struct pt_regs *regs,
e2c0cdfb PD	69	const unsigned long *args)
e2c0cdfb PD	70	{
32d92586 SRV	71	regs->orig_a0 = args[0];
	72	args++;
	73	memcpy(&regs->a1, args, 5 * sizeof(regs->a1));
e2c0cdfb PD	74	}
e2c0cdfb PD	75
16add411	76	static inline int syscall_get_arch(struct task_struct *task)
efe75c49 DA	77	{
	78	#ifdef CONFIG_64BIT
	79	return AUDIT_ARCH_RISCV64;
	80	#else
	81	return AUDIT_ARCH_RISCV32;
	82	#endif
	83	}
	84
bb4a23c9	85	asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
e2c0cdfb	86	#endif /* _ASM_RISCV_SYSCALL_H */