arch/sh/kernel/sys_sh32.c

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