alt_exit.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_irq.h"
#include "sys/alt_sim.h"
#include "os/alt_hooks.h"
#include "os/alt_syscall.h"

#include "alt_types.h"
#include "sys/alt_log_printf.h"
/*
 * _exit() is called by exit() in order to terminate the current process. 
 * Typically this is called when main() completes. It should never return. 
 * Since there is nowhere to go once this process completes, this 
 * implementation simply blocks forever.
 *
 * Note that interrupts are not disabled so that execution outside of this
 * thread is allowed to continue. 
 *
 * ALT_EXIT is mapped onto the _exit() system call in alt_syscall.h
 */

void ALT_EXIT (int exit_code)
{
  /* ALT_LOG - please see HAL/inc/alt_log_printf.h for details */
  ALT_LOG_PRINT_BOOT("[alt_exit.c] Entering _exit() function.\r\n");
  ALT_LOG_PRINT_BOOT("[alt_exit.c] Exit code from main was %d.\r\n",exit_code);
  /* Stop all other threads */

  ALT_LOG_PRINT_BOOT("[alt_exit.c] Calling ALT_OS_STOP().\r\n");
  ALT_OS_STOP();

  /* Provide notification to the simulator that we've stopped */

  ALT_LOG_PRINT_BOOT("[alt_exit.c] Calling ALT_SIM_HALT().\r\n");
  ALT_SIM_HALT(exit_code);

  /* spin forever, since there's no where to go back to */

  ALT_LOG_PRINT_BOOT("[alt_exit.c] Spinning forever.\r\n");
  while (1);
}