Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #include <linux/errno.h> |
| 2 | #include <linux/sched.h> |
| 3 | #include <linux/syscalls.h> |
| 4 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 5 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/sem.h> |
| 8 | #include <linux/msg.h> |
| 9 | #include <linux/shm.h> |
| 10 | #include <linux/stat.h> |
| 11 | #include <linux/mman.h> |
| 12 | #include <linux/file.h> |
| 13 | #include <linux/utsname.h> |
| 14 | #include <linux/personality.h> |
| 15 | |
| 16 | #include <asm/uaccess.h> |
| 17 | #include <asm/ia32.h> |
| 18 | |
| 19 | /* |
| 20 | * sys_pipe() is the normal C calling standard for creating |
| 21 | * a pipe. It's not the way Unix traditionally does this, though. |
| 22 | */ |
| 23 | asmlinkage long sys_pipe(int __user *fildes) |
| 24 | { |
| 25 | int fd[2]; |
| 26 | int error; |
| 27 | |
| 28 | error = do_pipe(fd); |
| 29 | if (!error) { |
| 30 | if (copy_to_user(fildes, fd, 2*sizeof(int))) |
| 31 | error = -EFAULT; |
| 32 | } |
| 33 | return error; |
| 34 | } |
| 35 | |
| 36 | asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, |
| 37 | unsigned long fd, unsigned long off) |
| 38 | { |
| 39 | long error; |
| 40 | struct file * file; |
| 41 | |
| 42 | error = -EINVAL; |
| 43 | if (off & ~PAGE_MASK) |
| 44 | goto out; |
| 45 | |
| 46 | error = -EBADF; |
| 47 | file = NULL; |
| 48 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
| 49 | if (!(flags & MAP_ANONYMOUS)) { |
| 50 | file = fget(fd); |
| 51 | if (!file) |
| 52 | goto out; |
| 53 | } |
| 54 | down_write(¤t->mm->mmap_sem); |
| 55 | error = do_mmap_pgoff(file, addr, len, prot, flags, off >> PAGE_SHIFT); |
| 56 | up_write(¤t->mm->mmap_sem); |
| 57 | |
| 58 | if (file) |
| 59 | fput(file); |
| 60 | out: |
| 61 | return error; |
| 62 | } |
| 63 | |
| 64 | static void find_start_end(unsigned long flags, unsigned long *begin, |
| 65 | unsigned long *end) |
| 66 | { |
Suresh Siddha | 8492980 | 2005-06-21 17:14:32 -0700 | [diff] [blame] | 67 | if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | /* This is usually used needed to map code in small |
| 69 | model, so it needs to be in the first 31bit. Limit |
| 70 | it to that. This means we need to move the |
| 71 | unmapped base down for this case. This can give |
| 72 | conflicts with the heap, but we assume that glibc |
| 73 | malloc knows how to fall back to mmap. Give it 1GB |
| 74 | of playground for now. -AK */ |
| 75 | *begin = 0x40000000; |
| 76 | *end = 0x80000000; |
Suresh Siddha | 8492980 | 2005-06-21 17:14:32 -0700 | [diff] [blame] | 77 | } else { |
| 78 | *begin = TASK_UNMAPPED_BASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | *end = TASK_SIZE; |
Suresh Siddha | 8492980 | 2005-06-21 17:14:32 -0700 | [diff] [blame] | 80 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | unsigned long |
| 84 | arch_get_unmapped_area(struct file *filp, unsigned long addr, |
| 85 | unsigned long len, unsigned long pgoff, unsigned long flags) |
| 86 | { |
| 87 | struct mm_struct *mm = current->mm; |
| 88 | struct vm_area_struct *vma; |
| 89 | unsigned long start_addr; |
| 90 | unsigned long begin, end; |
| 91 | |
Benjamin Herrenschmidt | 11300a6 | 2007-05-06 14:50:11 -0700 | [diff] [blame] | 92 | if (flags & MAP_FIXED) |
| 93 | return addr; |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | find_start_end(flags, &begin, &end); |
| 96 | |
| 97 | if (len > end) |
| 98 | return -ENOMEM; |
| 99 | |
| 100 | if (addr) { |
| 101 | addr = PAGE_ALIGN(addr); |
| 102 | vma = find_vma(mm, addr); |
| 103 | if (end - len >= addr && |
| 104 | (!vma || addr + len <= vma->vm_start)) |
| 105 | return addr; |
| 106 | } |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 107 | if (((flags & MAP_32BIT) || test_thread_flag(TIF_IA32)) |
| 108 | && len <= mm->cached_hole_size) { |
| 109 | mm->cached_hole_size = 0; |
| 110 | mm->free_area_cache = begin; |
| 111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | addr = mm->free_area_cache; |
| 113 | if (addr < begin) |
| 114 | addr = begin; |
| 115 | start_addr = addr; |
| 116 | |
| 117 | full_search: |
| 118 | for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { |
| 119 | /* At this point: (!vma || addr < vma->vm_end). */ |
| 120 | if (end - len < addr) { |
| 121 | /* |
| 122 | * Start a new search - just in case we missed |
| 123 | * some holes. |
| 124 | */ |
| 125 | if (start_addr != begin) { |
| 126 | start_addr = addr = begin; |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 127 | mm->cached_hole_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | goto full_search; |
| 129 | } |
| 130 | return -ENOMEM; |
| 131 | } |
| 132 | if (!vma || addr + len <= vma->vm_start) { |
| 133 | /* |
| 134 | * Remember the place where we stopped the search: |
| 135 | */ |
| 136 | mm->free_area_cache = addr + len; |
| 137 | return addr; |
| 138 | } |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 139 | if (addr + mm->cached_hole_size < vma->vm_start) |
| 140 | mm->cached_hole_size = vma->vm_start - addr; |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | addr = vma->vm_end; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | asmlinkage long sys_uname(struct new_utsname __user * name) |
| 147 | { |
| 148 | int err; |
| 149 | down_read(&uts_sem); |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 150 | err = copy_to_user(name, utsname(), sizeof (*name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | up_read(&uts_sem); |
| 152 | if (personality(current->personality) == PER_LINUX32) |
| 153 | err |= copy_to_user(&name->machine, "i686", 5); |
| 154 | return err ? -EFAULT : 0; |
| 155 | } |