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

/*
 * Access to user system call parameters and results
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * See asm-generic/syscall.h for descriptions of what we must do here.
 *
 * Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
 */

#ifndef __ASM_MIPS_SYSCALL_H
#define __ASM_MIPS_SYSCALL_H

#include <linux/compiler.h>
#include <uapi/linux/audit.h>
#include <linux/elf-em.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>

#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */
#define __NR_syscall 4000
#endif

static inline long syscall_get_nr(struct task_struct *task,
				  struct pt_regs *regs)
{
	/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
	if ((config_enabled(CONFIG_32BIT) ||
	    test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
	    (regs->regs[2] == __NR_syscall))
		return regs->regs[4];
	else
		return regs->regs[2];
}

static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
	struct task_struct *task, struct pt_regs *regs, unsigned int n)
{
	unsigned long usp __maybe_unused = regs->regs[29];

	switch (n) {
	case 0: case 1: case 2: case 3:
		*arg = regs->regs[4 + n];

		return 0;

#ifdef CONFIG_32BIT
	case 4: case 5: case 6: case 7:
		return get_user(*arg, (int *)usp + n);
#endif

#ifdef CONFIG_64BIT
	case 4: case 5: case 6: case 7:
#ifdef CONFIG_MIPS32_O32
		if (test_thread_flag(TIF_32BIT_REGS))
			return get_user(*arg, (int *)usp + n);
		else
#endif
			*arg = regs->regs[4 + n];

		return 0;
#endif

	default:
		BUG();
	}

	unreachable();
}

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

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	/* Do nothing */
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	if (error) {
		regs->regs[2] = -error;
		regs->regs[7] = -1;
	} else {
		regs->regs[2] = val;
		regs->regs[7] = 0;
	}
}

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	int ret;
	/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
	if ((config_enabled(CONFIG_32BIT) ||
	    test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
	    (regs->regs[2] == __NR_syscall)) {
		i++;
		n++;
	}

	while (n--)
		ret |= mips_get_syscall_arg(args++, task, regs, i++);

	/*
	 * No way to communicate an error because this is a void function.
	 */
#if 0
	return ret;
#endif
}

extern const unsigned long sys_call_table[];
extern const unsigned long sys32_call_table[];
extern const unsigned long sysn32_call_table[];

static inline int syscall_get_arch(void)
{
	int arch = AUDIT_ARCH_MIPS;
#ifdef CONFIG_64BIT
	if (!test_thread_flag(TIF_32BIT_REGS)) {
		arch |= __AUDIT_ARCH_64BIT;
		/* N32 sets only TIF_32BIT_ADDR */
		if (test_thread_flag(TIF_32BIT_ADDR))
			arch |= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
	}
#endif
#if defined(__LITTLE_ENDIAN)
	arch |=  __AUDIT_ARCH_LE;
#endif
	return arch;
}

#endif	/* __ASM_MIPS_SYSCALL_H */
Commit	Line	Data
19e2e172	1	/*
c0ff3c53 RB	2	* Access to user system call parameters and results
c0ff3c53 RB	3	*
19e2e172 RB	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
c0ff3c53 RB	8	* See asm-generic/syscall.h for descriptions of what we must do here.
c0ff3c53 RB	9	*
19e2e172 RB	10	* Copyright (C) 2012 Ralf Baechle <ralf@linux-mips.org>
	11	*/
	12
	13	#ifndef __ASM_MIPS_SYSCALL_H
	14	#define __ASM_MIPS_SYSCALL_H
	15
f5179287	16	#include <linux/compiler.h>
579ec9e1	17	#include <uapi/linux/audit.h>
bec9b2b2	18	#include <linux/elf-em.h>
c0ff3c53 RB	19	#include <linux/kernel.h>
	20	#include <linux/sched.h>
	21	#include <linux/uaccess.h>
	22	#include <asm/ptrace.h>
4c21b8fd MC	23	#include <asm/unistd.h>
	24
	25	#ifndef __NR_syscall /* Only defined if _MIPS_SIM == _MIPS_SIM_ABI32 */
	26	#define __NR_syscall 4000
	27	#endif
c0ff3c53 RB	28
	29	static inline long syscall_get_nr(struct task_struct *task,
	30	struct pt_regs *regs)
	31	{
4c21b8fd MC	32	/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
	33	if ((config_enabled(CONFIG_32BIT) \|\|
	34	test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
	35	(regs->regs[2] == __NR_syscall))
	36	return regs->regs[4];
	37	else
	38	return regs->regs[2];
c0ff3c53 RB	39	}
	40
	41	static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
	42	struct task_struct task, struct pt_regs regs, unsigned int n)
	43	{
63238f2c	44	unsigned long usp __maybe_unused = regs->regs[29];
c0ff3c53 RB	45
	46	switch (n) {
	47	case 0: case 1: case 2: case 3:
	48	*arg = regs->regs[4 + n];
	49
	50	return 0;
	51
	52	#ifdef CONFIG_32BIT
	53	case 4: case 5: case 6: case 7:
86ca57b5	54	return get_user(arg, (int )usp + n);
c0ff3c53 RB	55	#endif
	56
	57	#ifdef CONFIG_64BIT
	58	case 4: case 5: case 6: case 7:
	59	#ifdef CONFIG_MIPS32_O32
	60	if (test_thread_flag(TIF_32BIT_REGS))
86ca57b5	61	return get_user(arg, (int )usp + n);
c0ff3c53 RB	62	else
	63	#endif
	64	*arg = regs->regs[4 + n];
	65
	66	return 0;
	67	#endif
	68
	69	default:
	70	BUG();
	71	}
f5179287 RB	72
f5179287 RB	73	unreachable();
c0ff3c53 RB	74	}
c0ff3c53 RB	75
1d7bf993 RB	76	static inline long syscall_get_return_value(struct task_struct *task,
	77	struct pt_regs *regs)
	78	{
	79	return regs->regs[2];
	80	}
	81
22feadbe MC	82	static inline void syscall_rollback(struct task_struct *task,
	83	struct pt_regs *regs)
	84	{
	85	/* Do nothing */
	86	}
	87
1d7bf993 RB	88	static inline void syscall_set_return_value(struct task_struct *task,
	89	struct pt_regs *regs,
	90	int error, long val)
	91	{
	92	if (error) {
	93	regs->regs[2] = -error;
	94	regs->regs[7] = -1;
	95	} else {
	96	regs->regs[2] = val;
	97	regs->regs[7] = 0;
	98	}
	99	}
	100
c0ff3c53 RB	101	static inline void syscall_get_arguments(struct task_struct *task,
	102	struct pt_regs *regs,
	103	unsigned int i, unsigned int n,
	104	unsigned long *args)
	105	{
c0ff3c53	106	int ret;
4c21b8fd MC	107	/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
	108	if ((config_enabled(CONFIG_32BIT) \|\|
	109	test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
	110	(regs->regs[2] == __NR_syscall)) {
	111	i++;
	112	n++;
	113	}
c0ff3c53 RB	114
c0ff3c53 RB	115	while (n--)
a8031d2c	116	ret \|= mips_get_syscall_arg(args++, task, regs, i++);
c0ff3c53 RB	117
	118	/*
	119	* No way to communicate an error because this is a void function.
	120	*/
	121	#if 0
	122	return ret;
	123	#endif
	124	}
	125
19e2e172 RB	126	extern const unsigned long sys_call_table[];
	127	extern const unsigned long sys32_call_table[];
	128	extern const unsigned long sysn32_call_table[];
	129
5e937a9a	130	static inline int syscall_get_arch(void)
bec9b2b2	131	{
ce5d1128	132	int arch = AUDIT_ARCH_MIPS;
bec9b2b2	133	#ifdef CONFIG_64BIT
40381529	134	if (!test_thread_flag(TIF_32BIT_REGS)) {
6e345746	135	arch \|= __AUDIT_ARCH_64BIT;
40381529 MC	136	/* N32 sets only TIF_32BIT_ADDR */
	137	if (test_thread_flag(TIF_32BIT_ADDR))
	138	arch \|= __AUDIT_ARCH_CONVENTION_MIPS64_N32;
	139	}
bec9b2b2 RB	140	#endif
	141	#if defined(__LITTLE_ENDIAN)
	142	arch \|= __AUDIT_ARCH_LE;
	143	#endif
	144	return arch;
	145	}
	146
19e2e172	147	#endif /* __ASM_MIPS_SYSCALL_H */