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[/] [openrisc/] [trunk/] [or1ksim/] [testsuite/] [test-code-or1k/] [upcalls/] [upcall-misaligned.c] - Blame information for rev 114

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1 93 jeremybenn 
/* upcall-misaligned.c. Test of Or1ksim misaligned handling of upcalls
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3 
   Copyright (C) 2010 Embecosm Limited
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5 
   Contributors various OpenCores participants
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   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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8 
   This file is part of OpenRISC 1000 Architectural Simulator.
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10 
   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 3 of the License, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   You should have received a copy of the GNU General Public License along
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   with this program.  If not, see <http:  www.gnu.org/licenses/>.  */
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/* ----------------------------------------------------------------------------
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   This code is commented throughout for use with Doxygen.
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   --------------------------------------------------------------------------*/
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#include "support.h"
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#include "spr-defs.h"
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#include "board.h"
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31 
 
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/*!Alignment exception handler defined here. */
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unsigned long excpt_align;
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/*!Flag set if we get a misaligned access */
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static int  misaligned_p;
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/* --------------------------------------------------------------------------*/
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/*!Write a memory mapped byte register
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   Report the result, noting if we get a misalignment exception.
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   @param[in] addr   Memory mapped address
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   @param[in] value  Value to set                                            */
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/* --------------------------------------------------------------------------*/
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static void
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setreg8 (unsigned long int  addr,
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         unsigned char      value)
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{
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  *((volatile unsigned char *) addr) = value;
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  if (misaligned_p)
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    {
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      printf ("Writing byte at 0x%08lx: misalignment exception.\n", addr);
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      misaligned_p = 0;
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    }
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  else
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    {
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      printf ("Wrote byte at 0x%08lx = 0x%02x.\n", addr, value);
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    }
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}       /* setreg8 () */
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/* --------------------------------------------------------------------------*/
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/*!Write a memory mapped half word register
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   Report the result, noting if we get a misalignment exception.
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   @param[in] addr   Memory mapped address
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   @param[in] value  Value to set                                            */
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/* --------------------------------------------------------------------------*/
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static void
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setreg16 (unsigned long int   addr,
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          unsigned short int  value)
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{
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  *((volatile unsigned short int *) addr) = value;
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  if (misaligned_p)
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    {
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      printf ("Writing half word at 0x%08lx: misalignment exception.\n", addr);
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      misaligned_p = 0;
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    }
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  else
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    {
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      printf ("Wrote half word at 0x%08lx = 0x%04x.\n", addr, value);
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    }
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}       /* setreg16 () */
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/* --------------------------------------------------------------------------*/
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/*!Write a memory mapped full word register
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   Report the result, noting if we get a misalignment exception.
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   @param[in] addr   Memory mapped address
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   @param[in] value  Value to set                                            */
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/* --------------------------------------------------------------------------*/
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static void
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setreg32 (unsigned long int  addr,
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          unsigned long int  value)
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{
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  *((volatile unsigned long int *) addr) = value;
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  if (misaligned_p)
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    {
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      printf ("Writing full word at 0x%08lx: misalignment exception.\n", addr);
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      misaligned_p = 0;
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    }
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  else
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    {
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      printf ("Wrote full word at 0x%08lx = 0x%08lx.\n", addr, value);
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    }
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}       /* setreg32 () */
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/* --------------------------------------------------------------------------*/
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/*!Read a memory mapped byte register
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   Report the result, noting if we get a misalignment exception.
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   @param[in] addr   Memory mapped address
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   @return  Value read                                                       */
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/* --------------------------------------------------------------------------*/
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unsigned char
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getreg8 (unsigned long int  addr)
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{
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  unsigned char  res = *((volatile unsigned char *) addr);
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  if (misaligned_p)
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    {
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      printf ("Reading byte at 0x%08lx: misalignment exception.\n", addr);
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      misaligned_p = 0;
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    }
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  else
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    {
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      printf ("Read byte at 0x%08lx = 0x%02x.\n", addr, res);
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    }
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  return  res;
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}       /* getreg8 () */
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144 
 
145 
/* --------------------------------------------------------------------------*/
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/*!Read a memory mapped half word register
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148 
   Report the result, noting if we get a misalignment exception.
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   @param[in] addr   Memory mapped address
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   @return  Value read                                                       */
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/* --------------------------------------------------------------------------*/
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unsigned short int
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getreg16 (unsigned long int  addr)
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{
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  unsigned short int  res = *((volatile unsigned short int *) addr);
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  if (misaligned_p)
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    {
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      printf ("Reading half word at 0x%08lx: misalignment exception.\n", addr);
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      misaligned_p = 0;
163 
    }
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  else
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    {
166 
      printf ("Read half word at 0x%08lx = 0x%04x.\n", addr, res);
167 
    }
168 
 
169 
  return  res;
170 
 
171 
}       /* getreg16 () */
172 
 
173 
 
174 
/* --------------------------------------------------------------------------*/
175 
/*!Read a memory mapped full word register
176 
 
177 
   Report the result, noting if we get a misalignment exception.
178 
 
179 
   @param[in] addr   Memory mapped address
180 
 
181 
   @return  Value read                                                       */
182 
/* --------------------------------------------------------------------------*/
183 
unsigned long int
184 
getreg32 (unsigned long int  addr)
185 
{
186 
  unsigned long int  res = *((volatile unsigned long int *) addr);
187 
 
188 
  if (misaligned_p)
189 
    {
190 
      printf ("Reading full word at 0x%08lx: misalignment exception.\n", addr);
191 
      misaligned_p = 0;
192 
    }
193 
  else
194 
    {
195 
      printf ("Read full word at 0x%08lx = 0x%08lx.\n", addr, res);
196 
    }
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198 
  return  res;
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200 
}       /* getreg32 () */
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203 
/* --------------------------------------------------------------------------*/
204 
/*!Exception handler for misalignment.
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   Set the flag to indicated we have hit an exception.
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   We can't just return, since that will give us the instruction that caused
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   the problem in the first place. What we do instead is patch the EPCR SPR.
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   This is fine, so long as we didn't trap in a delay slot. The crude response
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   to that then we just exit.                                                */
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/* --------------------------------------------------------------------------*/
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void align_handler (void)
215 
{
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  misaligned_p = 1;
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  unsigned long int  iaddr = mfspr (SPR_EPCR_BASE);
219 
  unsigned long int  instr = *(unsigned long int *) iaddr;
220 
  unsigned char      opc   = instr >> 26;
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222 
  switch (opc)
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    {
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    case 0x00:                  /* l.j    */
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    case 0x01:                  /* l.jal  */
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    case 0x03:                  /* l.bnf  */
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    case 0x04:                  /* l.bf   */
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    case 0x11:                  /* l.jr   */
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    case 0x12:                  /* l.jalr */
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231 
      printf ("Misalignment exception unable to recover from delay slot.\n");
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      exit (1);
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      break;
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235 
    default:
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      mtspr (SPR_EPCR_BASE, iaddr + 4);         /* Step past */
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      break;
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    }
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}       /* align_handler () */
240 
 
241 
 
242 
/* --------------------------------------------------------------------------*/
243 
/*!Main program to read and write memory mapped registers
244 
 
245 
   Some of these are misaligned and should cause the appropriate exception.
246 
 
247 
   @return  The return code from the program (always zero).                  */
248 
/* --------------------------------------------------------------------------*/
249 
int
250 
main ()
251 
{
252 
  /* Set the exception handler, and note that no exceptions have yet
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     happened. */
254 
  printf ("Setting alignment exception handler.\n");
255 
  excpt_align  = (unsigned long)align_handler;
256 
  misaligned_p = 0;
257 
 
258 
  /* Write some registers */
259 
  printf ("Writing registers.\n");
260 
 
261 
  setreg8 (GENERIC_BASE, 0xde);
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263 
  setreg16 (GENERIC_BASE +  2, 0xdead);         /* Aligned */
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  setreg16 (GENERIC_BASE +  5, 0xbeef);         /* Unaligned */
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  setreg32 (GENERIC_BASE +  8, 0xdeadbeef);     /* Aligned */
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  setreg32 (GENERIC_BASE + 13, 0xcafebabe);     /* Unaligned */
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  setreg32 (GENERIC_BASE + 18, 0xbaadf00d);     /* Unaligned */
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  setreg32 (GENERIC_BASE + 23, 0xfee1babe);     /* Unaligned */
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  setreg32 (GENERIC_BASE + 28, 0xbaadbabe);     /* Aligned */
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272 
  /* Write some registers */
273 
  printf ("Reading registers.\n");
274 
 
275 
  (void)getreg8 (GENERIC_BASE);
276 
 
277 
  (void)getreg16 (GENERIC_BASE +  2);           /* Aligned */
278 
  (void)getreg16 (GENERIC_BASE +  5);           /* Unaligned */
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280 
  (void)getreg32 (GENERIC_BASE +  8);           /* Aligned */
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  (void)getreg32 (GENERIC_BASE + 13);           /* Unaligned */
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  (void)getreg32 (GENERIC_BASE + 18);           /* Unaligned */
283 
  (void)getreg32 (GENERIC_BASE + 23);           /* Unaligned */
284 
  (void)getreg32 (GENERIC_BASE + 28);           /* Aligned */
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286 
  /* We don't actually ever return */
287 
  report (0xdeaddead);
288 
  return 0;
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290 
}       /* main () */

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