[mirror_ubuntu-bionic-kernel.git] / arch / s390 / include / asm / syscall.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Access to user system call parameters and results
 *
 *  Copyright IBM Corp. 2008
 *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H	1

#include <uapi/linux/audit.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <asm/ptrace.h>

/*
 * The syscall table always contains 32 bit pointers since we know that the
 * address of the function to be called is (way) below 4GB.  So the "int"
 * type here is what we want [need] for both 32 bit and 64 bit systems.
 */
extern const unsigned int sys_call_table[];
extern const unsigned int sys_call_table_emu[];

static inline long syscall_get_nr(struct task_struct *task,
				  struct pt_regs *regs)
{
	return test_pt_regs_flag(regs, PIF_SYSCALL) ?
		(regs->int_code & 0xffff) : -1;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	regs->gprs[2] = regs->orig_gpr2;
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->gprs[2];
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->gprs[2] = error ? error : val;
}

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	unsigned long mask = -1UL;

	/*
	 * No arguments for this syscall, there's nothing to do.
	 */
	if (!n)
		return;

	BUG_ON(i + n > 6);
#ifdef CONFIG_COMPAT
	if (test_tsk_thread_flag(task, TIF_31BIT))
		mask = 0xffffffff;
#endif
	while (n-- > 0)
		if (i + n > 0)
			args[n] = regs->gprs[2 + i + n] & mask;
	if (i == 0)
		args[0] = regs->orig_gpr2 & mask;
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 const unsigned long *args)
{
	BUG_ON(i + n > 6);
	while (n-- > 0)
		if (i + n > 0)
			regs->gprs[2 + i + n] = args[n];
	if (i == 0)
		regs->orig_gpr2 = args[0];
}

static inline int syscall_get_arch(void)
{
#ifdef CONFIG_COMPAT
	if (test_tsk_thread_flag(current, TIF_31BIT))
		return AUDIT_ARCH_S390;
#endif
	return AUDIT_ARCH_S390X;
}
#endif	/* _ASM_SYSCALL_H */
Commit	Line	Data
0b73214f	1	/* SPDX-License-Identifier: GPL-2.0 */
753c4dd6 MS	2	/*
	3	* Access to user system call parameters and results
	4	*
	5	* Copyright IBM Corp. 2008
	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
753c4dd6 MS	7	*/
	8
	9	#ifndef _ASM_SYSCALL_H
	10	#define _ASM_SYSCALL_H 1
	11
579ec9e1	12	#include <uapi/linux/audit.h>
9bf1226b	13	#include <linux/sched.h>
20b40a79	14	#include <linux/err.h>
753c4dd6 MS	15	#include <asm/ptrace.h>
753c4dd6 MS	16
e7b8e675 MF	17	/*
	18	* The syscall table always contains 32 bit pointers since we know that the
	19	* address of the function to be called is (way) below 4GB. So the "int"
	20	* type here is what we want [need] for both 32 bit and 64 bit systems.
	21	*/
	22	extern const unsigned int sys_call_table[];
61649881	23	extern const unsigned int sys_call_table_emu[];
e7b8e675	24
753c4dd6 MS	25	static inline long syscall_get_nr(struct task_struct *task,
	26	struct pt_regs *regs)
	27	{
d3a73acb	28	return test_pt_regs_flag(regs, PIF_SYSCALL) ?
aa33c8cb	29	(regs->int_code & 0xffff) : -1;
753c4dd6 MS	30	}
	31
	32	static inline void syscall_rollback(struct task_struct *task,
	33	struct pt_regs *regs)
	34	{
	35	regs->gprs[2] = regs->orig_gpr2;
	36	}
	37
	38	static inline long syscall_get_error(struct task_struct *task,
	39	struct pt_regs *regs)
	40	{
20b40a79	41	return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
753c4dd6 MS	42	}
	43
	44	static inline long syscall_get_return_value(struct task_struct *task,
	45	struct pt_regs *regs)
	46	{
	47	return regs->gprs[2];
	48	}
	49
	50	static inline void syscall_set_return_value(struct task_struct *task,
	51	struct pt_regs *regs,
	52	int error, long val)
	53	{
dc295880	54	regs->gprs[2] = error ? error : val;
753c4dd6 MS	55	}
	56
	57	static inline void syscall_get_arguments(struct task_struct *task,
	58	struct pt_regs *regs,
	59	unsigned int i, unsigned int n,
	60	unsigned long *args)
	61	{
59da2139 MS	62	unsigned long mask = -1UL;
59da2139 MS	63
c46fc042 JO	64	/*
	65	* No arguments for this syscall, there's nothing to do.
	66	*/
	67	if (!n)
	68	return;
	69
753c4dd6 MS	70	BUG_ON(i + n > 6);
753c4dd6 MS	71	#ifdef CONFIG_COMPAT
59da2139 MS	72	if (test_tsk_thread_flag(task, TIF_31BIT))
59da2139 MS	73	mask = 0xffffffff;
753c4dd6	74	#endif
59da2139 MS	75	while (n-- > 0)
	76	if (i + n > 0)
	77	args[n] = regs->gprs[2 + i + n] & mask;
	78	if (i == 0)
	79	args[0] = regs->orig_gpr2 & mask;
753c4dd6 MS	80	}
	81
	82	static inline void syscall_set_arguments(struct task_struct *task,
	83	struct pt_regs *regs,
	84	unsigned int i, unsigned int n,
	85	const unsigned long *args)
	86	{
	87	BUG_ON(i + n > 6);
59da2139 MS	88	while (n-- > 0)
	89	if (i + n > 0)
	90	regs->gprs[2 + i + n] = args[n];
	91	if (i == 0)
	92	regs->orig_gpr2 = args[0];
753c4dd6 MS	93	}
753c4dd6 MS	94
5e937a9a	95	static inline int syscall_get_arch(void)
c63cb468 HC	96	{
c63cb468 HC	97	#ifdef CONFIG_COMPAT
5e937a9a	98	if (test_tsk_thread_flag(current, TIF_31BIT))
c63cb468 HC	99	return AUDIT_ARCH_S390;
c63cb468 HC	100	#endif
1a327ffd	101	return AUDIT_ARCH_S390X;
c63cb468	102	}
753c4dd6	103	#endif /* _ASM_SYSCALL_H */