arch/h8300/kernel/sys_h8300.c

   1 /*
   2  * linux/arch/h8300/kernel/sys_h8300.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the H8/300
   6  * platform.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/sched.h>
  11 #include <linux/mm.h>
  12 #include <linux/smp.h>
  13 #include <linux/sem.h>
  14 #include <linux/msg.h>
  15 #include <linux/shm.h>
  16 #include <linux/stat.h>
  17 #include <linux/syscalls.h>
  18 #include <linux/mman.h>
  19 #include <linux/file.h>
  20 #include <linux/fs.h>
  21 #include <linux/ipc.h>
  22
  23 #include <asm/setup.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/cachectl.h>
  26 #include <asm/traps.h>
  27 #include <asm/unistd.h>
  28
  29 /* sys_cacheflush -- no support.  */
  30 asmlinkage int
  31 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
  32 {
  33         return -EINVAL;
  34 }
  35
  36 asmlinkage int sys_getpagesize(void)
  37 {
  38         return PAGE_SIZE;
  39 }
  40
  41 #if defined(CONFIG_SYSCALL_PRINT)
  42 asmlinkage void syscall_print(void *dummy,...)
  43 {
  44         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
  45         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
  46                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
  47 }
  48 #endif
  49
  50 /*
  51  * Do a system call from kernel instead of calling sys_execve so we
  52  * end up with proper pt_regs.
  53  */
  54 int kernel_execve(const char *filename,
  55                   const char *const argv[],
  56                   const char *const envp[])
  57 {
  58         register long res __asm__("er0");
  59         register const char *const *_c __asm__("er3") = envp;
  60         register const char *const *_b __asm__("er2") = argv;
  61         register const char * _a __asm__("er1") = filename;
  62         __asm__ __volatile__ ("mov.l %1,er0\n\t"
  63                         "trapa  #0\n\t"
  64                         : "=r" (res)
  65                         : "g" (__NR_execve),
  66                           "g" (_a),
  67                           "g" (_b),
  68                           "g" (_c)
  69                         : "cc", "memory");
  70         return res;
  71 }
  72
  73