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
16 long 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
43 SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
44 {
45 return arch_prctl(current, option, (unsigned long __user *) arg2);
46 }
47
48 void 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
56 SYSCALL_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
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