Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
ba180fd4 | 2 | * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Copyright 2003 PathScale, Inc. |
4 | * | |
5 | * Licensed under the GPL | |
6 | */ | |
7 | ||
8 | #include "linux/linkage.h" | |
f7fe8781 | 9 | #include "linux/personality.h" |
ba180fd4 | 10 | #include "linux/utsname.h" |
1da177e4 | 11 | #include "asm/prctl.h" /* XXX This should get the constants from libc */ |
ba180fd4 | 12 | #include "asm/uaccess.h" |
f355559c | 13 | #include "os.h" |
1da177e4 | 14 | |
80f95078 PBG |
15 | asmlinkage long sys_uname64(struct new_utsname __user * name) |
16 | { | |
17 | int err; | |
ba180fd4 | 18 | |
80f95078 | 19 | down_read(&uts_sem); |
e9ff3990 | 20 | err = copy_to_user(name, utsname(), sizeof (*name)); |
80f95078 | 21 | up_read(&uts_sem); |
ba180fd4 | 22 | |
80f95078 PBG |
23 | if (personality(current->personality) == PER_LINUX32) |
24 | err |= copy_to_user(&name->machine, "i686", 5); | |
ba180fd4 | 25 | |
80f95078 PBG |
26 | return err ? -EFAULT : 0; |
27 | } | |
28 | ||
77bf4400 | 29 | long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr) |
1da177e4 | 30 | { |
ba180fd4 | 31 | unsigned long *ptr = addr, tmp; |
f355559c | 32 | long ret; |
6c738ffa | 33 | int pid = task->mm->context.id.u.pid; |
1da177e4 | 34 | |
f355559c JD |
35 | /* |
36 | * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to | |
37 | * be safe), we need to call arch_prctl on the host because | |
38 | * setting %fs may result in something else happening (like a | |
6e6d74cf JD |
39 | * GDT or thread.fs being set instead). So, we let the host |
40 | * fiddle the registers and thread struct and restore the | |
41 | * registers afterwards. | |
f355559c JD |
42 | * |
43 | * So, the saved registers are stored to the process (this | |
44 | * needed because a stub may have been the last thing to run), | |
45 | * arch_prctl is run on the host, then the registers are read | |
46 | * back. | |
47 | */ | |
ba180fd4 | 48 | switch (code) { |
1da177e4 | 49 | case ARCH_SET_FS: |
f767b02f | 50 | case ARCH_SET_GS: |
3e6f2ac4 JD |
51 | ret = restore_registers(pid, ¤t->thread.regs.regs); |
52 | if (ret) | |
53 | return ret; | |
ba180fd4 JD |
54 | break; |
55 | case ARCH_GET_FS: | |
56 | case ARCH_GET_GS: | |
57 | /* | |
58 | * With these two, we read to a local pointer and | |
59 | * put_user it to the userspace pointer that we were | |
60 | * given. If addr isn't valid (because it hasn't been | |
61 | * faulted in or is just bogus), we want put_user to | |
62 | * fault it in (or return -EFAULT) instead of having | |
63 | * the host return -EFAULT. | |
64 | */ | |
65 | ptr = &tmp; | |
66 | } | |
f355559c | 67 | |
ba180fd4 JD |
68 | ret = os_arch_prctl(pid, code, ptr); |
69 | if (ret) | |
70 | return ret; | |
f355559c | 71 | |
ba180fd4 | 72 | switch (code) { |
f355559c | 73 | case ARCH_SET_FS: |
44f5c4ce | 74 | current->thread.arch.fs = (unsigned long) ptr; |
3e6f2ac4 | 75 | ret = save_registers(pid, ¤t->thread.regs.regs); |
44f5c4ce | 76 | break; |
f355559c | 77 | case ARCH_SET_GS: |
3e6f2ac4 | 78 | ret = save_registers(pid, ¤t->thread.regs.regs); |
f767b02f | 79 | break; |
1da177e4 | 80 | case ARCH_GET_FS: |
f355559c | 81 | ret = put_user(tmp, addr); |
ba180fd4 | 82 | break; |
1da177e4 | 83 | case ARCH_GET_GS: |
f355559c | 84 | ret = put_user(tmp, addr); |
ba180fd4 | 85 | break; |
1da177e4 LT |
86 | } |
87 | ||
f355559c | 88 | return ret; |
1da177e4 | 89 | } |
1da177e4 LT |
90 | |
91 | long sys_arch_prctl(int code, unsigned long addr) | |
92 | { | |
77bf4400 | 93 | return arch_prctl(current, code, (unsigned long __user *) addr); |
1da177e4 LT |
94 | } |
95 | ||
96 | long sys_clone(unsigned long clone_flags, unsigned long newsp, | |
97 | void __user *parent_tid, void __user *child_tid) | |
98 | { | |
99 | long ret; | |
100 | ||
e0877f07 JD |
101 | if (!newsp) |
102 | newsp = UPT_SP(¤t->thread.regs.regs); | |
1da177e4 | 103 | current->thread.forking = 1; |
e0877f07 JD |
104 | ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid, |
105 | child_tid); | |
1da177e4 | 106 | current->thread.forking = 0; |
f355559c JD |
107 | return ret; |
108 | } | |
109 | ||
291248fd | 110 | void arch_switch_to(struct task_struct *to) |
f355559c | 111 | { |
ba180fd4 JD |
112 | if ((to->thread.arch.fs == 0) || (to->mm == NULL)) |
113 | return; | |
f355559c | 114 | |
ba180fd4 | 115 | arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs); |
1da177e4 | 116 | } |