diff options
Diffstat (limited to 'arch/um/kernel/syscall.c')
| -rw-r--r-- | arch/um/kernel/syscall.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c new file mode 100644 index 00000000000..abf14aaf905 --- /dev/null +++ b/arch/um/kernel/syscall.c @@ -0,0 +1,166 @@ +/* + * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#include "linux/sched.h" +#include "linux/file.h" +#include "linux/smp_lock.h" +#include "linux/mm.h" +#include "linux/utsname.h" +#include "linux/msg.h" +#include "linux/shm.h" +#include "linux/sys.h" +#include "linux/syscalls.h" +#include "linux/unistd.h" +#include "linux/slab.h" +#include "linux/utime.h" +#include "asm/mman.h" +#include "asm/uaccess.h" +#include "kern_util.h" +#include "user_util.h" +#include "sysdep/syscalls.h" +#include "mode_kern.h" +#include "choose-mode.h" + +/* Unlocked, I don't care if this is a bit off */ +int nsyscalls = 0; + +long sys_fork(void) +{ + long ret; + + current->thread.forking = 1; + ret = do_fork(SIGCHLD, UPT_SP(¤t->thread.regs.regs), + ¤t->thread.regs, 0, NULL, NULL); + current->thread.forking = 0; + return(ret); +} + +long sys_vfork(void) +{ + long ret; + + current->thread.forking = 1; + ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, + UPT_SP(¤t->thread.regs.regs), + ¤t->thread.regs, 0, NULL, NULL); + current->thread.forking = 0; + return(ret); +} + +/* common code for old and new mmaps */ +long sys_mmap2(unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long pgoff) +{ + long error = -EBADF; + struct file * 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, pgoff); + up_write(¤t->mm->mmap_sem); + + if (file) + fput(file); + out: + return error; +} + +long old_mmap(unsigned long addr, unsigned long len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long offset) +{ + long err = -EINVAL; + if (offset & ~PAGE_MASK) + goto out; + + err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); + out: + return err; +} +/* + * sys_pipe() is the normal C calling standard for creating + * a pipe. It's not the way unix traditionally does this, though. + */ +long sys_pipe(unsigned long __user * fildes) +{ + int fd[2]; + long error; + + error = do_pipe(fd); + if (!error) { + if (copy_to_user(fildes, fd, sizeof(fd))) + error = -EFAULT; + } + return error; +} + + +long sys_uname(struct old_utsname __user * name) +{ + long err; + if (!name) + return -EFAULT; + down_read(&uts_sem); + err = copy_to_user(name, utsname(), sizeof (*name)); + up_read(&uts_sem); + return err?-EFAULT:0; +} + +long sys_olduname(struct oldold_utsname __user * name) +{ + long error; + + if (!name) + return -EFAULT; + if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) + return -EFAULT; + + down_read(&uts_sem); + + error = __copy_to_user(&name->sysname, &utsname()->sysname, + __OLD_UTS_LEN); + error |= __put_user(0, name->sysname + __OLD_UTS_LEN); + error |= __copy_to_user(&name->nodename, &utsname()->nodename, + __OLD_UTS_LEN); + error |= __put_user(0, name->nodename + __OLD_UTS_LEN); + error |= __copy_to_user(&name->release, &utsname()->release, + __OLD_UTS_LEN); + error |= __put_user(0, name->release + __OLD_UTS_LEN); + error |= __copy_to_user(&name->version, &utsname()->version, + __OLD_UTS_LEN); + error |= __put_user(0, name->version + __OLD_UTS_LEN); + error |= __copy_to_user(&name->machine, &utsname()->machine, + __OLD_UTS_LEN); + error |= __put_user(0, name->machine + __OLD_UTS_LEN); + + up_read(&uts_sem); + + error = error ? -EFAULT : 0; + + return error; +} + +DEFINE_SPINLOCK(syscall_lock); + +static int syscall_index = 0; + +int next_syscall_index(int limit) +{ + int ret; + + spin_lock(&syscall_lock); + ret = syscall_index; + if(++syscall_index == limit) + syscall_index = 0; + spin_unlock(&syscall_lock); + return(ret); +} |