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3dd681d9 WD |
1 | /* |
2 | * Based on arch/arm/kernel/sys_arm.c | |
3 | * | |
4 | * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c | |
5 | * Copyright (C) 1995, 1996 Russell King. | |
6 | * Copyright (C) 2012 ARM Ltd. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #define __SYSCALL_COMPAT | |
22 | ||
23 | #include <linux/compat.h> | |
24 | #include <linux/personality.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/syscalls.h> | |
28 | #include <linux/uaccess.h> | |
29 | ||
30 | #include <asm/cacheflush.h> | |
31 | #include <asm/unistd.h> | |
32 | ||
33 | asmlinkage int compat_sys_fork(struct pt_regs *regs) | |
34 | { | |
35 | return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL); | |
36 | } | |
37 | ||
38 | asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp, | |
39 | int __user *parent_tidptr, int tls_val, | |
40 | int __user *child_tidptr, struct pt_regs *regs) | |
41 | { | |
42 | if (!newsp) | |
43 | newsp = regs->compat_sp; | |
44 | ||
45 | return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); | |
46 | } | |
47 | ||
48 | asmlinkage int compat_sys_vfork(struct pt_regs *regs) | |
49 | { | |
50 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp, | |
51 | regs, 0, NULL, NULL); | |
52 | } | |
53 | ||
54 | asmlinkage int compat_sys_execve(const char __user *filenamei, | |
55 | compat_uptr_t argv, compat_uptr_t envp, | |
56 | struct pt_regs *regs) | |
57 | { | |
58 | int error; | |
91a27b2a | 59 | struct filename *filename; |
3dd681d9 WD |
60 | |
61 | filename = getname(filenamei); | |
62 | error = PTR_ERR(filename); | |
63 | if (IS_ERR(filename)) | |
64 | goto out; | |
91a27b2a JL |
65 | error = compat_do_execve(filename->name, compat_ptr(argv), |
66 | compat_ptr(envp), regs); | |
3dd681d9 WD |
67 | putname(filename); |
68 | out: | |
69 | return error; | |
70 | } | |
71 | ||
72 | asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid, | |
73 | struct compat_timespec __user *interval) | |
74 | { | |
75 | struct timespec t; | |
76 | int ret; | |
77 | mm_segment_t old_fs = get_fs(); | |
78 | ||
79 | set_fs(KERNEL_DS); | |
80 | ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); | |
81 | set_fs(old_fs); | |
82 | if (put_compat_timespec(&t, interval)) | |
83 | return -EFAULT; | |
84 | return ret; | |
85 | } | |
86 | ||
3dd681d9 WD |
87 | static inline void |
88 | do_compat_cache_op(unsigned long start, unsigned long end, int flags) | |
89 | { | |
90 | struct mm_struct *mm = current->active_mm; | |
91 | struct vm_area_struct *vma; | |
92 | ||
93 | if (end < start || flags) | |
94 | return; | |
95 | ||
96 | down_read(&mm->mmap_sem); | |
97 | vma = find_vma(mm, start); | |
98 | if (vma && vma->vm_start < end) { | |
99 | if (start < vma->vm_start) | |
100 | start = vma->vm_start; | |
101 | if (end > vma->vm_end) | |
102 | end = vma->vm_end; | |
103 | up_read(&mm->mmap_sem); | |
104 | __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end)); | |
105 | return; | |
106 | } | |
107 | up_read(&mm->mmap_sem); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Handle all unrecognised system calls. | |
112 | */ | |
113 | long compat_arm_syscall(struct pt_regs *regs) | |
114 | { | |
115 | unsigned int no = regs->regs[7]; | |
116 | ||
117 | switch (no) { | |
118 | /* | |
119 | * Flush a region from virtual address 'r0' to virtual address 'r1' | |
120 | * _exclusive_. There is no alignment requirement on either address; | |
121 | * user space does not need to know the hardware cache layout. | |
122 | * | |
123 | * r2 contains flags. It should ALWAYS be passed as ZERO until it | |
124 | * is defined to be something else. For now we ignore it, but may | |
125 | * the fires of hell burn in your belly if you break this rule. ;) | |
126 | * | |
127 | * (at a later date, we may want to allow this call to not flush | |
128 | * various aspects of the cache. Passing '0' will guarantee that | |
129 | * everything necessary gets flushed to maintain consistency in | |
130 | * the specified region). | |
131 | */ | |
132 | case __ARM_NR_compat_cacheflush: | |
133 | do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]); | |
134 | return 0; | |
135 | ||
136 | case __ARM_NR_compat_set_tls: | |
137 | current->thread.tp_value = regs->regs[0]; | |
138 | asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0])); | |
139 | return 0; | |
140 | ||
141 | default: | |
142 | return -ENOSYS; | |
143 | } | |
144 | } |