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-rw-r--r--arch/um/sys-x86_64/syscalls.c66
1 files changed, 32 insertions, 34 deletions
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c
index bbcab773b23d..58ae06562b4a 100644
--- a/arch/um/sys-x86_64/syscalls.c
+++ b/arch/um/sys-x86_64/syscalls.c
@@ -1,36 +1,34 @@
1/* 1/*
2 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
2 * Copyright 2003 PathScale, Inc. 3 * Copyright 2003 PathScale, Inc.
3 * 4 *
4 * Licensed under the GPL 5 * Licensed under the GPL
5 */ 6 */
6 7
7#include "linux/linkage.h" 8#include "linux/linkage.h"
8#include "linux/slab.h"
9#include "linux/shm.h"
10#include "linux/utsname.h"
11#include "linux/personality.h" 9#include "linux/personality.h"
12#include "asm/uaccess.h" 10#include "linux/utsname.h"
13#define __FRAME_OFFSETS
14#include "asm/ptrace.h"
15#include "asm/unistd.h"
16#include "asm/prctl.h" /* XXX This should get the constants from libc */ 11#include "asm/prctl.h" /* XXX This should get the constants from libc */
17#include "kern.h" 12#include "asm/uaccess.h"
18#include "os.h" 13#include "os.h"
19 14
20asmlinkage long sys_uname64(struct new_utsname __user * name) 15asmlinkage long sys_uname64(struct new_utsname __user * name)
21{ 16{
22 int err; 17 int err;
18
23 down_read(&uts_sem); 19 down_read(&uts_sem);
24 err = copy_to_user(name, utsname(), sizeof (*name)); 20 err = copy_to_user(name, utsname(), sizeof (*name));
25 up_read(&uts_sem); 21 up_read(&uts_sem);
22
26 if (personality(current->personality) == PER_LINUX32) 23 if (personality(current->personality) == PER_LINUX32)
27 err |= copy_to_user(&name->machine, "i686", 5); 24 err |= copy_to_user(&name->machine, "i686", 5);
25
28 return err ? -EFAULT : 0; 26 return err ? -EFAULT : 0;
29} 27}
30 28
31long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr) 29long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
32{ 30{
33 unsigned long *ptr = addr, tmp; 31 unsigned long *ptr = addr, tmp;
34 long ret; 32 long ret;
35 int pid = task->mm->context.skas.id.u.pid; 33 int pid = task->mm->context.skas.id.u.pid;
36 34
@@ -47,42 +45,42 @@ long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
47 * arch_prctl is run on the host, then the registers are read 45 * arch_prctl is run on the host, then the registers are read
48 * back. 46 * back.
49 */ 47 */
50 switch(code){ 48 switch (code) {
51 case ARCH_SET_FS: 49 case ARCH_SET_FS:
52 case ARCH_SET_GS: 50 case ARCH_SET_GS:
53 restore_registers(pid, &current->thread.regs.regs); 51 restore_registers(pid, &current->thread.regs.regs);
54 break; 52 break;
55 case ARCH_GET_FS: 53 case ARCH_GET_FS:
56 case ARCH_GET_GS: 54 case ARCH_GET_GS:
57 /* 55 /*
58 * With these two, we read to a local pointer and 56 * With these two, we read to a local pointer and
59 * put_user it to the userspace pointer that we were 57 * put_user it to the userspace pointer that we were
60 * given. If addr isn't valid (because it hasn't been 58 * given. If addr isn't valid (because it hasn't been
61 * faulted in or is just bogus), we want put_user to 59 * faulted in or is just bogus), we want put_user to
62 * fault it in (or return -EFAULT) instead of having 60 * fault it in (or return -EFAULT) instead of having
63 * the host return -EFAULT. 61 * the host return -EFAULT.
64 */ 62 */
65 ptr = &tmp; 63 ptr = &tmp;
66 } 64 }
67 65
68 ret = os_arch_prctl(pid, code, ptr); 66 ret = os_arch_prctl(pid, code, ptr);
69 if(ret) 67 if (ret)
70 return ret; 68 return ret;
71 69
72 switch(code){ 70 switch (code) {
73 case ARCH_SET_FS: 71 case ARCH_SET_FS:
74 current->thread.arch.fs = (unsigned long) ptr; 72 current->thread.arch.fs = (unsigned long) ptr;
75 save_registers(pid, &current->thread.regs.regs); 73 save_registers(pid, &current->thread.regs.regs);
76 break; 74 break;
77 case ARCH_SET_GS: 75 case ARCH_SET_GS:
78 save_registers(pid, &current->thread.regs.regs); 76 save_registers(pid, &current->thread.regs.regs);
79 break; 77 break;
80 case ARCH_GET_FS: 78 case ARCH_GET_FS:
81 ret = put_user(tmp, addr); 79 ret = put_user(tmp, addr);
82 break; 80 break;
83 case ARCH_GET_GS: 81 case ARCH_GET_GS:
84 ret = put_user(tmp, addr); 82 ret = put_user(tmp, addr);
85 break; 83 break;
86 } 84 }
87 85
88 return ret; 86 return ret;
@@ -109,8 +107,8 @@ long sys_clone(unsigned long clone_flags, unsigned long newsp,
109 107
110void arch_switch_to(struct task_struct *from, struct task_struct *to) 108void arch_switch_to(struct task_struct *from, struct task_struct *to)
111{ 109{
112 if((to->thread.arch.fs == 0) || (to->mm == NULL)) 110 if ((to->thread.arch.fs == 0) || (to->mm == NULL))
113 return; 111 return;
114 112
115 arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs); 113 arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
116} 114}