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}

  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/linkage.h"
  9#include "linux/personality.h"
 10#include "linux/utsname.h"
 11#include "asm/prctl.h" /* XXX This should get the constants from libc */
 12#include "asm/uaccess.h"
 13#include "os.h"
 
 14
 15long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
 
 16{
 17	unsigned long *ptr = addr, tmp;
 18	long ret;
 19	int pid = task->mm->context.id.u.pid;
 20
 21	/*
 22	 * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
 23	 * be safe), we need to call arch_prctl on the host because
 24	 * setting %fs may result in something else happening (like a
 25	 * GDT or thread.fs being set instead).  So, we let the host
 26	 * fiddle the registers and thread struct and restore the
 27	 * registers afterwards.
 28	 *
 29	 * So, the saved registers are stored to the process (this
 30	 * needed because a stub may have been the last thing to run),
 31	 * arch_prctl is run on the host, then the registers are read
 32	 * back.
 33	 */
 34	switch (code) {
 35	case ARCH_SET_FS:
 36	case ARCH_SET_GS:
 37		ret = restore_registers(pid, &current->thread.regs.regs);
 38		if (ret)
 39			return ret;
 40		break;
 41	case ARCH_GET_FS:
 42	case ARCH_GET_GS:
 43		/*
 44		 * With these two, we read to a local pointer and
 45		 * put_user it to the userspace pointer that we were
 46		 * given.  If addr isn't valid (because it hasn't been
 47		 * faulted in or is just bogus), we want put_user to
 48		 * fault it in (or return -EFAULT) instead of having
 49		 * the host return -EFAULT.
 50		 */
 51		ptr = &tmp;
 52	}
 53
 54	ret = os_arch_prctl(pid, code, ptr);
 55	if (ret)
 56		return ret;
 57
 58	switch (code) {
 59	case ARCH_SET_FS:
 60		current->thread.arch.fs = (unsigned long) ptr;
 61		ret = save_registers(pid, &current->thread.regs.regs);
 
 62		break;
 63	case ARCH_SET_GS:
 64		ret = save_registers(pid, &current->thread.regs.regs);
 
 
 65		break;
 66	case ARCH_GET_FS:
 67		ret = put_user(tmp, addr);
 68		break;
 69	case ARCH_GET_GS:
 70		ret = put_user(tmp, addr);
 71		break;
 72	}
 73
 74	return ret;
 75}
 76
 77long sys_arch_prctl(int code, unsigned long addr)
 78{
 79	return arch_prctl(current, code, (unsigned long __user *) addr);
 80}
 81
 82long sys_clone(unsigned long clone_flags, unsigned long newsp,
 83	       void __user *parent_tid, void __user *child_tid)
 84{
 85	long ret;
 86
 87	if (!newsp)
 88		newsp = UPT_SP(&current->thread.regs.regs);
 89	current->thread.forking = 1;
 90	ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
 91		      child_tid);
 92	current->thread.forking = 0;
 93	return ret;
 94}
 95
 96void arch_switch_to(struct task_struct *to)
 
 
 97{
 98	if ((to->thread.arch.fs == 0) || (to->mm == NULL))
 99		return;
100
101	arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
102}