LXR linux/arch/sh/kernel/sys

   1#include <linux/errno.h>
   2#include <linux/sched.h>
   3#include <linux/mm.h>
   4#include <linux/smp.h>
   5#include <linux/sem.h>
   6#include <linux/msg.h>
   7#include <linux/shm.h>
   8#include <linux/stat.h>
   9#include <linux/syscalls.h>
  10#include <linux/mman.h>
  11#include <linux/file.h>
  12#include <linux/module.h>
  13#include <linux/fs.h>
  14#include <linux/ipc.h>
  15#include <asm/cacheflush.h>
  16#include <asm/uaccess.h>
  17#include <asm/unistd.h>
  18#include <asm/syscalls.h>
  19
  20/*
  21 * sys_pipe() is the normal C calling standard for creating
  22 * a pipe. It's not the way Unix traditionally does this, though.
  23 */
  24asmlinkage int sys_sh_pipe(unsigned long r4, unsigned long r5,
  25        unsigned long r6, unsigned long r7,
  26        struct pt_regs __regs)
  27{
  28        struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
  29        int fd[2];
  30        int error;
  31
  32        error = do_pipe_flags(fd, 0);
  33        if (!error) {
  34                regs->regs[1] = fd[1];
  35                return fd[0];
  36        }
  37        return error;
  38}
  39
  40asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char __user *buf,
  41                             size_t count, long dummy, loff_t pos)
  42{
  43        return sys_pread64(fd, buf, count, pos);
  44}
  45
  46asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char __user *buf,
  47                              size_t count, long dummy, loff_t pos)
  48{
  49        return sys_pwrite64(fd, buf, count, pos);
  50}
  51
  52asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
  53                                u32 len0, u32 len1, int advice)
  54{
  55#ifdef  __LITTLE_ENDIAN__
  56        return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
  57                                (u64)len1 << 32 | len0, advice);
  58#else
  59        return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
  60                                (u64)len0 << 32 | len1, advice);
  61#endif
  62}
  63
  64#if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
  65#define SYSCALL_ARG3    "trapa #0x23"
  66#else
  67#define SYSCALL_ARG3    "trapa #0x13"
  68#endif
  69
  70/*
  71 * Do a system call from kernel instead of calling sys_execve so we
  72 * end up with proper pt_regs.
  73 */
  74int kernel_execve(const char *filename,
  75                  const char *const argv[],
  76                  const char *const envp[])
  77{
  78        register long __sc0 __asm__ ("r3") = __NR_execve;
  79        register long __sc4 __asm__ ("r4") = (long) filename;
  80        register long __sc5 __asm__ ("r5") = (long) argv;
  81        register long __sc6 __asm__ ("r6") = (long) envp;
  82        __asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0)
  83                        : "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6)
  84                        : "memory");
  85        return __sc0;
  86}
  87