alt_execve.c

nios中自定义指令集实现三角函数的软件部分。

/******************************************************************************
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* License Agreement                                                           *
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* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
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/******************************************************************************
*                                                                             *
* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT IT DIRECTLY.           *
*                                                                             *
* Overriding HAL Functions                                                    *
*                                                                             *
* To provide your own implementation of a HAL function, include the file in   *
* your Nios II IDE application project. When building the executable, the     *
* Nios II IDE finds your function first, and uses it in place of the HAL      *
* version.                                                                    *
*                                                                             *
******************************************************************************/

#include "sys/alt_errno.h"
#include "sys/alt_warning.h"
#include "os/alt_syscall.h"

/*
 * execve() is used by newlib to launch new processes. This is unsupported in
 * the HAL environment. However a "do-nothing" implementation is still 
 * provied for newlib compatability.
 *
 * ALT_EXECVE is mapped onto the execve() system call in alt_syscall.h
 */
 
int ALT_EXECVE (char *name, char ** argv, char** env)
{
  /* Generate a link time warning, should this function ever be called. */

  ALT_STUB_WARNING(execve);

  /* Indicate an error */

  ALT_ERRNO = ENOSYS;
  return -1;
}