arch/um/kernel/tt/syscall_kern.c

   1 /*
   2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/types.h"
   7 #include "linux/utime.h"
   8 #include "linux/sys.h"
   9 #include "linux/ptrace.h"
  10 #include "asm/unistd.h"
  11 #include "asm/ptrace.h"
  12 #include "asm/uaccess.h"
  13 #include "asm/stat.h"
  14 #include "sysdep/syscalls.h"
  15 #include "sysdep/sigcontext.h"
  16 #include "kern_util.h"
  17 #include "syscall.h"
  18
  19 void syscall_handler_tt(int sig, struct pt_regs *regs)
  20 {
  21         void *sc;
  22         long result;
  23         int syscall;
  24 #ifdef CONFIG_SYSCALL_DEBUG
  25         int index;
  26 #endif
  27         sc = UPT_SC(&regs->regs);
  28         SC_START_SYSCALL(sc);
  29
  30         syscall = UPT_SYSCALL_NR(&regs->regs);
  31
  32 #ifdef CONFIG_SYSCALL_DEBUG
  33         index = record_syscall_start(syscall);
  34 #endif
  35
  36         syscall_trace(&regs->regs, 0);
  37
  38         current->thread.nsyscalls++;
  39         nsyscalls++;
  40
  41         if((syscall >= NR_syscalls) || (syscall < 0))
  42                 result = -ENOSYS;
  43         else result = EXECUTE_SYSCALL(syscall, regs);
  44
  45         /* regs->sc may have changed while the system call ran (there may
  46          * have been an interrupt or segfault), so it needs to be refreshed.
  47          */
  48         UPT_SC(&regs->regs) = sc;
  49
  50         SC_SET_SYSCALL_RETURN(sc, result);
  51
  52         syscall_trace(&regs->regs, 1);
  53 #ifdef CONFIG_SYSCALL_DEBUG
  54         record_syscall_end(index, result);
  55 #endif
  56 }