2 * linux/arch/x86_64/kernel/sys_x86_64.c
5 #include <linux/errno.h>
6 #include <linux/sched.h>
7 #include <linux/syscalls.h>
10 #include <linux/smp_lock.h>
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>
20 #include <asm/uaccess.h>
24 * sys_pipe() is the normal C calling standard for creating
25 * a pipe. It's not the way Unix traditionally does this, though.
27 asmlinkage long sys_pipe(int __user *fildes)
34 if (copy_to_user(fildes, fd, 2*sizeof(int)))
40 asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags,
41 unsigned long fd, unsigned long off)
52 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
53 if (!(flags & MAP_ANONYMOUS)) {
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);
68 static void find_start_end(unsigned long flags, unsigned long *begin,
71 if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) {
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 */
82 *begin = TASK_UNMAPPED_BASE;
88 arch_get_unmapped_area(struct file *filp, unsigned long addr,
89 unsigned long len, unsigned long pgoff, unsigned long flags)
91 struct mm_struct *mm = current->mm;
92 struct vm_area_struct *vma;
93 unsigned long start_addr;
94 unsigned long begin, end;
96 find_start_end(flags, &begin, &end);
102 addr = PAGE_ALIGN(addr);
103 vma = find_vma(mm, addr);
104 if (end - len >= addr &&
105 (!vma || addr + len <= vma->vm_start))
108 addr = mm->free_area_cache;
114 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
115 /* At this point: (!vma || addr < vma->vm_end). */
116 if (end - len < addr) {
118 * Start a new search - just in case we missed
121 if (start_addr != begin) {
122 start_addr = addr = begin;
127 if (!vma || addr + len <= vma->vm_start) {
129 * Remember the place where we stopped the search:
131 mm->free_area_cache = addr + len;
138 asmlinkage long sys_uname(struct new_utsname __user * name)
142 err = copy_to_user(name, &system_utsname, sizeof (*name));
144 if (personality(current->personality) == PER_LINUX32)
145 err |= copy_to_user(&name->machine, "i686", 5);
146 return err ? -EFAULT : 0;
149 asmlinkage long sys_time64(long __user * tloc)
154 do_gettimeofday(&now);
157 if (put_user(i,tloc))