Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/kernel/sys_x86_64.c | |
3 | */ | |
4 | ||
5 | #include <linux/errno.h> | |
6 | #include <linux/sched.h> | |
7 | #include <linux/syscalls.h> | |
8 | #include <linux/mm.h> | |
4e950f6f | 9 | #include <linux/fs.h> |
1da177e4 | 10 | #include <linux/smp.h> |
1da177e4 LT |
11 | #include <linux/sem.h> |
12 | #include <linux/msg.h> | |
13 | #include <linux/shm.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/mman.h> | |
16 | #include <linux/file.h> | |
17 | #include <linux/utsname.h> | |
18 | #include <linux/personality.h> | |
19 | ||
20 | #include <asm/uaccess.h> | |
21 | #include <asm/ia32.h> | |
22 | ||
23 | /* | |
24 | * sys_pipe() is the normal C calling standard for creating | |
25 | * a pipe. It's not the way Unix traditionally does this, though. | |
26 | */ | |
27 | asmlinkage long sys_pipe(int __user *fildes) | |
28 | { | |
29 | int fd[2]; | |
30 | int error; | |
31 | ||
32 | error = do_pipe(fd); | |
33 | if (!error) { | |
34 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
35 | error = -EFAULT; | |
36 | } | |
37 | return error; | |
38 | } | |
39 | ||
40 | asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, | |
41 | unsigned long fd, unsigned long off) | |
42 | { | |
43 | long error; | |
44 | struct file * file; | |
45 | ||
46 | error = -EINVAL; | |
47 | if (off & ~PAGE_MASK) | |
48 | goto out; | |
49 | ||
50 | error = -EBADF; | |
51 | file = NULL; | |
52 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
53 | if (!(flags & MAP_ANONYMOUS)) { | |
54 | file = fget(fd); | |
55 | if (!file) | |
56 | goto out; | |
57 | } | |
58 | down_write(¤t->mm->mmap_sem); | |
59 | error = do_mmap_pgoff(file, addr, len, prot, flags, off >> PAGE_SHIFT); | |
60 | up_write(¤t->mm->mmap_sem); | |
61 | ||
62 | if (file) | |
63 | fput(file); | |
64 | out: | |
65 | return error; | |
66 | } | |
67 | ||
68 | static void find_start_end(unsigned long flags, unsigned long *begin, | |
69 | unsigned long *end) | |
70 | { | |
84929801 | 71 | if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) { |
1da177e4 LT |
72 | /* This is usually used needed to map code in small |
73 | model, so it needs to be in the first 31bit. Limit | |
74 | it to that. This means we need to move the | |
75 | unmapped base down for this case. This can give | |
76 | conflicts with the heap, but we assume that glibc | |
77 | malloc knows how to fall back to mmap. Give it 1GB | |
78 | of playground for now. -AK */ | |
79 | *begin = 0x40000000; | |
80 | *end = 0x80000000; | |
84929801 SS |
81 | } else { |
82 | *begin = TASK_UNMAPPED_BASE; | |
1da177e4 | 83 | *end = TASK_SIZE; |
84929801 | 84 | } |
1da177e4 LT |
85 | } |
86 | ||
87 | unsigned long | |
88 | arch_get_unmapped_area(struct file *filp, unsigned long addr, | |
89 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
90 | { | |
91 | struct mm_struct *mm = current->mm; | |
92 | struct vm_area_struct *vma; | |
93 | unsigned long start_addr; | |
94 | unsigned long begin, end; | |
95 | ||
11300a64 BH |
96 | if (flags & MAP_FIXED) |
97 | return addr; | |
98 | ||
1da177e4 LT |
99 | find_start_end(flags, &begin, &end); |
100 | ||
101 | if (len > end) | |
102 | return -ENOMEM; | |
103 | ||
104 | if (addr) { | |
105 | addr = PAGE_ALIGN(addr); | |
106 | vma = find_vma(mm, addr); | |
107 | if (end - len >= addr && | |
108 | (!vma || addr + len <= vma->vm_start)) | |
109 | return addr; | |
110 | } | |
1363c3cd WW |
111 | if (((flags & MAP_32BIT) || test_thread_flag(TIF_IA32)) |
112 | && len <= mm->cached_hole_size) { | |
113 | mm->cached_hole_size = 0; | |
114 | mm->free_area_cache = begin; | |
115 | } | |
1da177e4 LT |
116 | addr = mm->free_area_cache; |
117 | if (addr < begin) | |
118 | addr = begin; | |
119 | start_addr = addr; | |
120 | ||
121 | full_search: | |
122 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { | |
123 | /* At this point: (!vma || addr < vma->vm_end). */ | |
124 | if (end - len < addr) { | |
125 | /* | |
126 | * Start a new search - just in case we missed | |
127 | * some holes. | |
128 | */ | |
129 | if (start_addr != begin) { | |
130 | start_addr = addr = begin; | |
1363c3cd | 131 | mm->cached_hole_size = 0; |
1da177e4 LT |
132 | goto full_search; |
133 | } | |
134 | return -ENOMEM; | |
135 | } | |
136 | if (!vma || addr + len <= vma->vm_start) { | |
137 | /* | |
138 | * Remember the place where we stopped the search: | |
139 | */ | |
140 | mm->free_area_cache = addr + len; | |
141 | return addr; | |
142 | } | |
1363c3cd WW |
143 | if (addr + mm->cached_hole_size < vma->vm_start) |
144 | mm->cached_hole_size = vma->vm_start - addr; | |
145 | ||
1da177e4 LT |
146 | addr = vma->vm_end; |
147 | } | |
148 | } | |
149 | ||
150 | asmlinkage long sys_uname(struct new_utsname __user * name) | |
151 | { | |
152 | int err; | |
153 | down_read(&uts_sem); | |
e9ff3990 | 154 | err = copy_to_user(name, utsname(), sizeof (*name)); |
1da177e4 LT |
155 | up_read(&uts_sem); |
156 | if (personality(current->personality) == PER_LINUX32) | |
157 | err |= copy_to_user(&name->machine, "i686", 5); | |
158 | return err ? -EFAULT : 0; | |
159 | } |