1/*
2 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Copyright 2003 PathScale, Inc.
4 *
5 * Licensed under the GPL
6 */
7
8#include <linux/sched.h>
9#include <linux/sched/mm.h>
10#include <linux/syscalls.h>
11#include <linux/uaccess.h>
12#include <asm/prctl.h> /* XXX This should get the constants from libc */
13#include <registers.h>
14#include <os.h>
15
16long arch_prctl(struct task_struct *task, int option,
17		unsigned long __user *arg2)
18{
19	long ret = -EINVAL;
20
21	switch (option) {
22	case ARCH_SET_FS:
23		current->thread.regs.regs.gp[FS_BASE / sizeof(unsigned long)] =
24			(unsigned long) arg2;
25		ret = 0;
26		break;
27	case ARCH_SET_GS:
28		current->thread.regs.regs.gp[GS_BASE / sizeof(unsigned long)] =
29			(unsigned long) arg2;
30		ret = 0;
31		break;
32	case ARCH_GET_FS:
33		ret = put_user(current->thread.regs.regs.gp[FS_BASE / sizeof(unsigned long)], arg2);
34		break;
35	case ARCH_GET_GS:
36		ret = put_user(current->thread.regs.regs.gp[GS_BASE / sizeof(unsigned long)], arg2);
37		break;
38	}
39
40	return ret;
41}
42
43SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
44{
45	return arch_prctl(current, option, (unsigned long __user *) arg2);
46}
47
48void arch_switch_to(struct task_struct *to)
49{
50	/*
51	 * Nothing needs to be done on x86_64.
52	 * The FS_BASE/GS_BASE registers are saved in the ptrace register set.
53	 */
54}
55
56SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
57		unsigned long, prot, unsigned long, flags,
58		unsigned long, fd, unsigned long, off)
59{
60	if (off & ~PAGE_MASK)
61		return -EINVAL;
62
63	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
64}
65