diff options
Diffstat (limited to 'arch/x86_64/kernel/sys_x86_64.c')
| -rw-r--r-- | arch/x86_64/kernel/sys_x86_64.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/sys_x86_64.c b/arch/x86_64/kernel/sys_x86_64.c new file mode 100644 index 0000000..477d8be --- /dev/null +++ b/arch/x86_64/kernel/sys_x86_64.c @@ -0,0 +1,173 @@ +/* + * linux/arch/x86_64/kernel/sys_x86_64.c + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/syscalls.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/sem.h> +#include <linux/msg.h> +#include <linux/shm.h> +#include <linux/stat.h> +#include <linux/mman.h> +#include <linux/file.h> +#include <linux/utsname.h> +#include <linux/personality.h> + +#include <asm/uaccess.h> +#include <asm/ia32.h> + +/* + * sys_pipe() is the normal C calling standard for creating + * a pipe. It's not the way Unix traditionally does this, though. + */ +asmlinkage long sys_pipe(int __user *fildes) +{ + int fd[2]; + int error; + + error = do_pipe(fd); + if (!error) { + if (copy_to_user(fildes, fd, 2*sizeof(int))) + error = -EFAULT; + } + return error; +} + +asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long off) +{ + long error; + struct file * file; + + error = -EINVAL; + if (off & ~PAGE_MASK) + goto out; + + error = -EBADF; + file = NULL; + flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); + if (!(flags & MAP_ANONYMOUS)) { + file = fget(fd); + if (!file) + goto out; + } + down_write(¤t->mm->mmap_sem); + error = do_mmap_pgoff(file, addr, len, prot, flags, off >> PAGE_SHIFT); + up_write(¤t->mm->mmap_sem); + + if (file) + fput(file); +out: + return error; +} + +static void find_start_end(unsigned long flags, unsigned long *begin, + unsigned long *end) +{ +#ifdef CONFIG_IA32_EMULATION + if (test_thread_flag(TIF_IA32)) { + *begin = TASK_UNMAPPED_32; + *end = IA32_PAGE_OFFSET; + } else +#endif + if (flags & MAP_32BIT) { + /* This is usually used needed to map code in small + model, so it needs to be in the first 31bit. Limit + it to that. This means we need to move the + unmapped base down for this case. This can give + conflicts with the heap, but we assume that glibc + malloc knows how to fall back to mmap. Give it 1GB + of playground for now. -AK */ + *begin = 0x40000000; + *end = 0x80000000; + } else { + *begin = TASK_UNMAPPED_64; + *end = TASK_SIZE; + } +} + +unsigned long +arch_get_unmapped_area(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + unsigned long start_addr; + unsigned long begin, end; + + find_start_end(flags, &begin, &end); + + if (len > end) + return -ENOMEM; + + if (addr) { + addr = PAGE_ALIGN(addr); + vma = find_vma(mm, addr); + if (end - len >= addr && + (!vma || addr + len <= vma->vm_start)) + return addr; + } + addr = mm->free_area_cache; + if (addr < begin) + addr = begin; + start_addr = addr; + +full_search: + for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { + /* At this point: (!vma || addr < vma->vm_end). */ + if (end - len < addr) { + /* + * Start a new search - just in case we missed + * some holes. + */ + if (start_addr != begin) { + start_addr = addr = begin; + goto full_search; + } + return -ENOMEM; + } + if (!vma || addr + len <= vma->vm_start) { + /* + * Remember the place where we stopped the search: + */ + mm->free_area_cache = addr + len; + return addr; + } + addr = vma->vm_end; + } +} + +asmlinkage long sys_uname(struct new_utsname __user * name) +{ + int err; + down_read(&uts_sem); + err = copy_to_user(name, &system_utsname, sizeof (*name)); + up_read(&uts_sem); + if (personality(current->personality) == PER_LINUX32) + err |= copy_to_user(&name->machine, "i686", 5); + return err ? -EFAULT : 0; +} + +asmlinkage long wrap_sys_shmat(int shmid, char __user *shmaddr, int shmflg) +{ + unsigned long raddr; + return do_shmat(shmid,shmaddr,shmflg,&raddr) ?: (long)raddr; +} + +asmlinkage long sys_time64(long __user * tloc) +{ + struct timeval now; + int i; + + do_gettimeofday(&now); + i = now.tv_sec; + if (tloc) { + if (put_user(i,tloc)) + i = -EFAULT; + } + return i; +} |