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syscall.c

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include "linux/kernel.h"
#include "linux/ptrace.h"
#include "kern_util.h"
#include "sysdep/ptrace.h"
#include "sysdep/syscalls.h"

void handle_syscall(struct uml_pt_regs *r)
{
      struct pt_regs *regs = container_of(r, struct pt_regs, regs);
      long result;
      int syscall;

      syscall_trace(r, 0);

      current->thread.nsyscalls++;
      nsyscalls++;

      /*
       * This should go in the declaration of syscall, but when I do that,
       * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
       * children at all, sometimes hanging when bash doesn't see the first
       * ls exit.
       * The assembly looks functionally the same to me.  This is
       *     gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
       * in case it's a compiler bug.
       */
      syscall = UPT_SYSCALL_NR(r);
      if ((syscall >= NR_syscalls) || (syscall < 0))
            result = -ENOSYS;
      else result = EXECUTE_SYSCALL(syscall, regs);

      REGS_SET_SYSCALL_RETURN(r->gp, result);

      syscall_trace(r, 1);
}

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