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/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  */
  24 asmlinkage 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
  40 asmlinkage 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
  46 asmlinkage 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
  52 asmlinkage 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  */
  74 int 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 }