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1da177e4 LT |
1 | |
2 | /* | |
3 | * PARISC specific syscalls | |
4 | * | |
5 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
6 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
7 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> | |
8 | * | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <asm/uaccess.h> | |
26 | #include <linux/file.h> | |
27 | #include <linux/fs.h> | |
28 | #include <linux/linkage.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/mman.h> | |
31 | #include <linux/shm.h> | |
32 | #include <linux/smp_lock.h> | |
33 | #include <linux/syscalls.h> | |
34 | ||
35 | int sys_pipe(int __user *fildes) | |
36 | { | |
37 | int fd[2]; | |
38 | int error; | |
39 | ||
40 | error = do_pipe(fd); | |
41 | if (!error) { | |
42 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
43 | error = -EFAULT; | |
44 | } | |
45 | return error; | |
46 | } | |
47 | ||
48 | static unsigned long get_unshared_area(unsigned long addr, unsigned long len) | |
49 | { | |
50 | struct vm_area_struct *vma; | |
51 | ||
52 | addr = PAGE_ALIGN(addr); | |
53 | ||
54 | for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { | |
55 | /* At this point: (!vma || addr < vma->vm_end). */ | |
56 | if (TASK_SIZE - len < addr) | |
57 | return -ENOMEM; | |
58 | if (!vma || addr + len <= vma->vm_start) | |
59 | return addr; | |
60 | addr = vma->vm_end; | |
61 | } | |
62 | } | |
63 | ||
64 | #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1)) | |
65 | ||
66 | /* | |
67 | * We need to know the offset to use. Old scheme was to look for | |
68 | * existing mapping and use the same offset. New scheme is to use the | |
69 | * address of the kernel data structure as the seed for the offset. | |
70 | * We'll see how that works... | |
71 | * | |
72 | * The mapping is cacheline aligned, so there's no information in the bottom | |
73 | * few bits of the address. We're looking for 10 bits (4MB / 4k), so let's | |
74 | * drop the bottom 8 bits and use bits 8-17. | |
75 | */ | |
76 | static int get_offset(struct address_space *mapping) | |
77 | { | |
78 | int offset = (unsigned long) mapping << (PAGE_SHIFT - 8); | |
79 | return offset & 0x3FF000; | |
80 | } | |
81 | ||
82 | static unsigned long get_shared_area(struct address_space *mapping, | |
83 | unsigned long addr, unsigned long len, unsigned long pgoff) | |
84 | { | |
85 | struct vm_area_struct *vma; | |
86 | int offset = mapping ? get_offset(mapping) : 0; | |
87 | ||
88 | addr = DCACHE_ALIGN(addr - offset) + offset; | |
89 | ||
90 | for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { | |
91 | /* At this point: (!vma || addr < vma->vm_end). */ | |
92 | if (TASK_SIZE - len < addr) | |
93 | return -ENOMEM; | |
94 | if (!vma || addr + len <= vma->vm_start) | |
95 | return addr; | |
96 | addr = DCACHE_ALIGN(vma->vm_end - offset) + offset; | |
97 | if (addr < vma->vm_end) /* handle wraparound */ | |
98 | return -ENOMEM; | |
99 | } | |
100 | } | |
101 | ||
102 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
103 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
104 | { | |
105 | if (len > TASK_SIZE) | |
106 | return -ENOMEM; | |
107 | if (!addr) | |
108 | addr = TASK_UNMAPPED_BASE; | |
109 | ||
110 | if (filp) { | |
111 | addr = get_shared_area(filp->f_mapping, addr, len, pgoff); | |
112 | } else if(flags & MAP_SHARED) { | |
113 | addr = get_shared_area(NULL, addr, len, pgoff); | |
114 | } else { | |
115 | addr = get_unshared_area(addr, len); | |
116 | } | |
117 | return addr; | |
118 | } | |
119 | ||
120 | static unsigned long do_mmap2(unsigned long addr, unsigned long len, | |
121 | unsigned long prot, unsigned long flags, unsigned long fd, | |
122 | unsigned long pgoff) | |
123 | { | |
124 | struct file * file = NULL; | |
125 | unsigned long error = -EBADF; | |
126 | if (!(flags & MAP_ANONYMOUS)) { | |
127 | file = fget(fd); | |
128 | if (!file) | |
129 | goto out; | |
130 | } | |
131 | ||
132 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
133 | ||
134 | down_write(¤t->mm->mmap_sem); | |
135 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); | |
136 | up_write(¤t->mm->mmap_sem); | |
137 | ||
138 | if (file != NULL) | |
139 | fput(file); | |
140 | out: | |
141 | return error; | |
142 | } | |
143 | ||
144 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, | |
145 | unsigned long prot, unsigned long flags, unsigned long fd, | |
146 | unsigned long pgoff) | |
147 | { | |
148 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
149 | we have. */ | |
150 | return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12)); | |
151 | } | |
152 | ||
153 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
154 | unsigned long prot, unsigned long flags, unsigned long fd, | |
155 | unsigned long offset) | |
156 | { | |
157 | if (!(offset & ~PAGE_MASK)) { | |
158 | return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); | |
159 | } else { | |
160 | return -EINVAL; | |
161 | } | |
162 | } | |
163 | ||
164 | long sys_shmat_wrapper(int shmid, char __user *shmaddr, int shmflag) | |
165 | { | |
166 | unsigned long raddr; | |
167 | int r; | |
168 | ||
169 | r = do_shmat(shmid, shmaddr, shmflag, &raddr); | |
170 | if (r < 0) | |
171 | return r; | |
172 | return raddr; | |
173 | } | |
174 | ||
175 | /* Fucking broken ABI */ | |
176 | ||
177 | #ifdef CONFIG_64BIT | |
178 | asmlinkage long parisc_truncate64(const char __user * path, | |
179 | unsigned int high, unsigned int low) | |
180 | { | |
181 | return sys_truncate(path, (long)high << 32 | low); | |
182 | } | |
183 | ||
184 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
185 | unsigned int high, unsigned int low) | |
186 | { | |
187 | return sys_ftruncate(fd, (long)high << 32 | low); | |
188 | } | |
189 | ||
190 | /* stubs for the benefit of the syscall_table since truncate64 and truncate | |
191 | * are identical on LP64 */ | |
192 | asmlinkage long sys_truncate64(const char __user * path, unsigned long length) | |
193 | { | |
194 | return sys_truncate(path, length); | |
195 | } | |
196 | asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) | |
197 | { | |
198 | return sys_ftruncate(fd, length); | |
199 | } | |
200 | asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) | |
201 | { | |
202 | return sys_fcntl(fd, cmd, arg); | |
203 | } | |
204 | #else | |
205 | ||
206 | asmlinkage long parisc_truncate64(const char __user * path, | |
207 | unsigned int high, unsigned int low) | |
208 | { | |
209 | return sys_truncate64(path, (loff_t)high << 32 | low); | |
210 | } | |
211 | ||
212 | asmlinkage long parisc_ftruncate64(unsigned int fd, | |
213 | unsigned int high, unsigned int low) | |
214 | { | |
215 | return sys_ftruncate64(fd, (loff_t)high << 32 | low); | |
216 | } | |
217 | #endif | |
218 | ||
219 | asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, | |
220 | unsigned int high, unsigned int low) | |
221 | { | |
222 | return sys_pread64(fd, buf, count, (loff_t)high << 32 | low); | |
223 | } | |
224 | ||
225 | asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, | |
226 | size_t count, unsigned int high, unsigned int low) | |
227 | { | |
228 | return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); | |
229 | } | |
230 | ||
231 | asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, | |
232 | size_t count) | |
233 | { | |
234 | return sys_readahead(fd, (loff_t)high << 32 | low, count); | |
235 | } | |
236 | ||
237 | asmlinkage long parisc_fadvise64_64(int fd, | |
238 | unsigned int high_off, unsigned int low_off, | |
239 | unsigned int high_len, unsigned int low_len, int advice) | |
240 | { | |
241 | return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, | |
242 | (loff_t)high_len << 32 | low_len, advice); | |
243 | } | |
244 | ||
245 | asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag) | |
246 | { | |
247 | return -ENOMEM; | |
248 | } | |
249 | ||
250 | asmlinkage int sys_free_hugepages(unsigned long addr) | |
251 | { | |
252 | return -EINVAL; | |
253 | } |