mirror of https://gitee.com/openkylin/linux.git
140 lines
3.0 KiB
C
140 lines
3.0 KiB
C
/*
|
|
* 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)
|
|
{
|
|
return current_thread_info()->syscall;
|
|
}
|
|
|
|
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 ((IS_ENABLED(CONFIG_32BIT) ||
|
|
test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
|
|
(regs->regs[2] == __NR_syscall))
|
|
i++;
|
|
|
|
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 */
|