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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/syscalls.h>
33 #include <linux/utsname.h>
34 #include <linux/personality.h>
35 
get_unshared_area(unsigned long addr,unsigned long len)36 static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
37 {
38 	struct vm_area_struct *vma;
39 
40 	addr = PAGE_ALIGN(addr);
41 
42 	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
43 		/* At this point:  (!vma || addr < vma->vm_end). */
44 		if (TASK_SIZE - len < addr)
45 			return -ENOMEM;
46 		if (!vma || addr + len <= vma->vm_start)
47 			return addr;
48 		addr = vma->vm_end;
49 	}
50 }
51 
52 #define DCACHE_ALIGN(addr) (((addr) + (SHMLBA - 1)) &~ (SHMLBA - 1))
53 
54 /*
55  * We need to know the offset to use.  Old scheme was to look for
56  * existing mapping and use the same offset.  New scheme is to use the
57  * address of the kernel data structure as the seed for the offset.
58  * We'll see how that works...
59  *
60  * The mapping is cacheline aligned, so there's no information in the bottom
61  * few bits of the address.  We're looking for 10 bits (4MB / 4k), so let's
62  * drop the bottom 8 bits and use bits 8-17.
63  */
get_offset(struct address_space * mapping)64 static int get_offset(struct address_space *mapping)
65 {
66 	int offset = (unsigned long) mapping << (PAGE_SHIFT - 8);
67 	return offset & 0x3FF000;
68 }
69 
get_shared_area(struct address_space * mapping,unsigned long addr,unsigned long len,unsigned long pgoff)70 static unsigned long get_shared_area(struct address_space *mapping,
71 		unsigned long addr, unsigned long len, unsigned long pgoff)
72 {
73 	struct vm_area_struct *vma;
74 	int offset = mapping ? get_offset(mapping) : 0;
75 
76 	offset = (offset + (pgoff << PAGE_SHIFT)) & 0x3FF000;
77 
78 	addr = DCACHE_ALIGN(addr - offset) + offset;
79 
80 	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
81 		/* At this point:  (!vma || addr < vma->vm_end). */
82 		if (TASK_SIZE - len < addr)
83 			return -ENOMEM;
84 		if (!vma || addr + len <= vma->vm_start)
85 			return addr;
86 		addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
87 		if (addr < vma->vm_end) /* handle wraparound */
88 			return -ENOMEM;
89 	}
90 }
91 
arch_get_unmapped_area(struct file * filp,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)92 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
93 		unsigned long len, unsigned long pgoff, unsigned long flags)
94 {
95 	if (len > TASK_SIZE)
96 		return -ENOMEM;
97 	/* Might want to check for cache aliasing issues for MAP_FIXED case
98 	 * like ARM or MIPS ??? --BenH.
99 	 */
100 	if (flags & MAP_FIXED)
101 		return addr;
102 	if (!addr)
103 		addr = TASK_UNMAPPED_BASE;
104 
105 	if (filp) {
106 		addr = get_shared_area(filp->f_mapping, addr, len, pgoff);
107 	} else if(flags & MAP_SHARED) {
108 		addr = get_shared_area(NULL, addr, len, pgoff);
109 	} else {
110 		addr = get_unshared_area(addr, len);
111 	}
112 	return addr;
113 }
114 
sys_mmap2(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long pgoff)115 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
116 	unsigned long prot, unsigned long flags, unsigned long fd,
117 	unsigned long pgoff)
118 {
119 	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
120 	   we have. */
121 	return sys_mmap_pgoff(addr, len, prot, flags, fd,
122 			      pgoff >> (PAGE_SHIFT - 12));
123 }
124 
sys_mmap(unsigned long addr,unsigned long len,unsigned long prot,unsigned long flags,unsigned long fd,unsigned long offset)125 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
126 		unsigned long prot, unsigned long flags, unsigned long fd,
127 		unsigned long offset)
128 {
129 	if (!(offset & ~PAGE_MASK)) {
130 		return sys_mmap_pgoff(addr, len, prot, flags, fd,
131 					offset >> PAGE_SHIFT);
132 	} else {
133 		return -EINVAL;
134 	}
135 }
136 
137 /* Fucking broken ABI */
138 
139 #ifdef CONFIG_64BIT
parisc_truncate64(const char __user * path,unsigned int high,unsigned int low)140 asmlinkage long parisc_truncate64(const char __user * path,
141 					unsigned int high, unsigned int low)
142 {
143 	return sys_truncate(path, (long)high << 32 | low);
144 }
145 
parisc_ftruncate64(unsigned int fd,unsigned int high,unsigned int low)146 asmlinkage long parisc_ftruncate64(unsigned int fd,
147 					unsigned int high, unsigned int low)
148 {
149 	return sys_ftruncate(fd, (long)high << 32 | low);
150 }
151 
152 /* stubs for the benefit of the syscall_table since truncate64 and truncate
153  * are identical on LP64 */
sys_truncate64(const char __user * path,unsigned long length)154 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
155 {
156 	return sys_truncate(path, length);
157 }
sys_ftruncate64(unsigned int fd,unsigned long length)158 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
159 {
160 	return sys_ftruncate(fd, length);
161 }
sys_fcntl64(unsigned int fd,unsigned int cmd,unsigned long arg)162 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
163 {
164 	return sys_fcntl(fd, cmd, arg);
165 }
166 #else
167 
parisc_truncate64(const char __user * path,unsigned int high,unsigned int low)168 asmlinkage long parisc_truncate64(const char __user * path,
169 					unsigned int high, unsigned int low)
170 {
171 	return sys_truncate64(path, (loff_t)high << 32 | low);
172 }
173 
parisc_ftruncate64(unsigned int fd,unsigned int high,unsigned int low)174 asmlinkage long parisc_ftruncate64(unsigned int fd,
175 					unsigned int high, unsigned int low)
176 {
177 	return sys_ftruncate64(fd, (loff_t)high << 32 | low);
178 }
179 #endif
180 
parisc_pread64(unsigned int fd,char __user * buf,size_t count,unsigned int high,unsigned int low)181 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
182 					unsigned int high, unsigned int low)
183 {
184 	return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
185 }
186 
parisc_pwrite64(unsigned int fd,const char __user * buf,size_t count,unsigned int high,unsigned int low)187 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
188 			size_t count, unsigned int high, unsigned int low)
189 {
190 	return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
191 }
192 
parisc_readahead(int fd,unsigned int high,unsigned int low,size_t count)193 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
194 		                    size_t count)
195 {
196 	return sys_readahead(fd, (loff_t)high << 32 | low, count);
197 }
198 
parisc_fadvise64_64(int fd,unsigned int high_off,unsigned int low_off,unsigned int high_len,unsigned int low_len,int advice)199 asmlinkage long parisc_fadvise64_64(int fd,
200 			unsigned int high_off, unsigned int low_off,
201 			unsigned int high_len, unsigned int low_len, int advice)
202 {
203 	return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
204 			(loff_t)high_len << 32 | low_len, advice);
205 }
206 
parisc_sync_file_range(int fd,u32 hi_off,u32 lo_off,u32 hi_nbytes,u32 lo_nbytes,unsigned int flags)207 asmlinkage long parisc_sync_file_range(int fd,
208 			u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
209 			unsigned int flags)
210 {
211 	return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
212 			(loff_t)hi_nbytes << 32 | lo_nbytes, flags);
213 }
214 
sys_alloc_hugepages(int key,unsigned long addr,unsigned long len,int prot,int flag)215 asmlinkage unsigned long sys_alloc_hugepages(int key, unsigned long addr, unsigned long len, int prot, int flag)
216 {
217 	return -ENOMEM;
218 }
219 
sys_free_hugepages(unsigned long addr)220 asmlinkage int sys_free_hugepages(unsigned long addr)
221 {
222 	return -EINVAL;
223 }
224 
parisc_personality(unsigned long personality)225 long parisc_personality(unsigned long personality)
226 {
227 	long err;
228 
229 	if (personality(current->personality) == PER_LINUX32
230 	    && personality == PER_LINUX)
231 		personality = PER_LINUX32;
232 
233 	err = sys_personality(personality);
234 	if (err == PER_LINUX32)
235 		err = PER_LINUX;
236 
237 	return err;
238 }
239