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[/] [or1k/] [branches/] [oc/] [gdb-5.0/] [sim/] [fr30/] [fr30.c] - Blame information for rev 1771

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1 106 markom 
/* fr30 simulator support code
2 
   Copyright (C) 1998, 1999 Free Software Foundation, Inc.
3 
   Contributed by Cygnus Solutions.
4 
 
5 
This file is part of the GNU simulators.
6 
 
7 
This program is free software; you can redistribute it and/or modify
8 
it under the terms of the GNU General Public License as published by
9 
the Free Software Foundation; either version 2, or (at your option)
10 
any later version.
11 
 
12 
This program is distributed in the hope that it will be useful,
13 
but WITHOUT ANY WARRANTY; without even the implied warranty of
14 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 
GNU General Public License for more details.
16 
 
17 
You should have received a copy of the GNU General Public License along
18 
with this program; if not, write to the Free Software Foundation, Inc.,
19 
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
20 
 
21 
#define WANT_CPU
22 
#define WANT_CPU_FR30BF
23 
 
24 
#include "sim-main.h"
25 
#include "cgen-mem.h"
26 
#include "cgen-ops.h"
27 
 
28 
/* Convert gdb dedicated register number to actual dr reg number.  */
29 
 
30 
static int
31 
decode_gdb_dr_regnum (int gdb_regnum)
32 
{
33 
  switch (gdb_regnum)
34 
    {
35 
    case TBR_REGNUM : return H_DR_TBR;
36 
    case RP_REGNUM : return H_DR_RP;
37 
    case SSP_REGNUM : return H_DR_SSP;
38 
    case USP_REGNUM : return H_DR_USP;
39 
    case MDH_REGNUM : return H_DR_MDH;
40 
    case MDL_REGNUM : return H_DR_MDL;
41 
    }
42 
  abort ();
43 
}
44 
 
45 
/* The contents of BUF are in target byte order.  */
46 
 
47 
int
48 
fr30bf_fetch_register (SIM_CPU *current_cpu, int rn, unsigned char *buf, int len)
49 
{
50 
  if (rn < 16)
51 
    SETTWI (buf, fr30bf_h_gr_get (current_cpu, rn));
52 
  else
53 
    switch (rn)
54 
      {
55 
      case PC_REGNUM :
56 
        SETTWI (buf, fr30bf_h_pc_get (current_cpu));
57 
        break;
58 
      case PS_REGNUM :
59 
        SETTWI (buf, fr30bf_h_ps_get (current_cpu));
60 
        break;
61 
      case TBR_REGNUM :
62 
      case RP_REGNUM :
63 
      case SSP_REGNUM :
64 
      case USP_REGNUM :
65 
      case MDH_REGNUM :
66 
      case MDL_REGNUM :
67 
        SETTWI (buf, fr30bf_h_dr_get (current_cpu,
68 
                                      decode_gdb_dr_regnum (rn)));
69 
        break;
70 
      default :
71 
        return 0;
72 
      }
73 
 
74 
  return -1; /*FIXME*/
75 
}
76 
 
77 
/* The contents of BUF are in target byte order.  */
78 
 
79 
int
80 
fr30bf_store_register (SIM_CPU *current_cpu, int rn, unsigned char *buf, int len)
81 
{
82 
  if (rn < 16)
83 
    fr30bf_h_gr_set (current_cpu, rn, GETTWI (buf));
84 
  else
85 
    switch (rn)
86 
      {
87 
      case PC_REGNUM :
88 
        fr30bf_h_pc_set (current_cpu, GETTWI (buf));
89 
        break;
90 
      case PS_REGNUM :
91 
        fr30bf_h_ps_set (current_cpu, GETTWI (buf));
92 
        break;
93 
      case TBR_REGNUM :
94 
      case RP_REGNUM :
95 
      case SSP_REGNUM :
96 
      case USP_REGNUM :
97 
      case MDH_REGNUM :
98 
      case MDL_REGNUM :
99 
        fr30bf_h_dr_set (current_cpu,
100 
                         decode_gdb_dr_regnum (rn),
101 
                         GETTWI (buf));
102 
        break;
103 
      default :
104 
        return 0;
105 
      }
106 
 
107 
  return -1; /*FIXME*/
108 
}
109 
 
110 
/* Cover fns to access the ccr bits.  */
111 
 
112 
BI
113 
fr30bf_h_sbit_get_handler (SIM_CPU *current_cpu)
114 
{
115 
  return CPU (h_sbit);
116 
}
117 
 
118 
void
119 
fr30bf_h_sbit_set_handler (SIM_CPU *current_cpu, BI newval)
120 
{
121 
  int old_sbit = CPU (h_sbit);
122 
  int new_sbit = (newval != 0);
123 
 
124 
  CPU (h_sbit) = new_sbit;
125 
 
126 
  /* When switching stack modes, update the registers.  */
127 
  if (old_sbit != new_sbit)
128 
    {
129 
      if (old_sbit)
130 
        {
131 
          /* Switching user -> system.  */
132 
          CPU (h_dr[H_DR_USP]) = CPU (h_gr[H_GR_SP]);
133 
          CPU (h_gr[H_GR_SP]) = CPU (h_dr[H_DR_SSP]);
134 
        }
135 
      else
136 
        {
137 
          /* Switching system -> user.  */
138 
          CPU (h_dr[H_DR_SSP]) = CPU (h_gr[H_GR_SP]);
139 
          CPU (h_gr[H_GR_SP]) = CPU (h_dr[H_DR_USP]);
140 
        }
141 
    }
142 
 
143 
  /* TODO: r15 interlock */
144 
}
145 
 
146 
/* Cover fns to access the ccr bits.  */
147 
 
148 
UQI
149 
fr30bf_h_ccr_get_handler (SIM_CPU *current_cpu)
150 
{
151 
  int ccr = (  (GET_H_CBIT () << 0)
152 
             | (GET_H_VBIT () << 1)
153 
             | (GET_H_ZBIT () << 2)
154 
             | (GET_H_NBIT () << 3)
155 
             | (GET_H_IBIT () << 4)
156 
             | (GET_H_SBIT () << 5));
157 
 
158 
  return ccr;
159 
}
160 
 
161 
void
162 
fr30bf_h_ccr_set_handler (SIM_CPU *current_cpu, UQI newval)
163 
{
164 
  int ccr = newval & 0x3f;
165 
 
166 
  SET_H_CBIT ((ccr & 1) != 0);
167 
  SET_H_VBIT ((ccr & 2) != 0);
168 
  SET_H_ZBIT ((ccr & 4) != 0);
169 
  SET_H_NBIT ((ccr & 8) != 0);
170 
  SET_H_IBIT ((ccr & 0x10) != 0);
171 
  SET_H_SBIT ((ccr & 0x20) != 0);
172 
}
173 
 
174 
/* Cover fns to access the scr bits.  */
175 
 
176 
UQI
177 
fr30bf_h_scr_get_handler (SIM_CPU *current_cpu)
178 
{
179 
  int scr = (  (GET_H_TBIT () << 0)
180 
             | (GET_H_D0BIT () << 1)
181 
             | (GET_H_D1BIT () << 2));
182 
  return scr;
183 
}
184 
 
185 
void
186 
fr30bf_h_scr_set_handler (SIM_CPU *current_cpu, UQI newval)
187 
{
188 
  int scr = newval & 7;
189 
 
190 
  SET_H_TBIT  ((scr & 1) != 0);
191 
  SET_H_D0BIT ((scr & 2) != 0);
192 
  SET_H_D1BIT ((scr & 4) != 0);
193 
}
194 
 
195 
/* Cover fns to access the ilm bits.  */
196 
 
197 
UQI
198 
fr30bf_h_ilm_get_handler (SIM_CPU *current_cpu)
199 
{
200 
  return CPU (h_ilm);
201 
}
202 
 
203 
void
204 
fr30bf_h_ilm_set_handler (SIM_CPU *current_cpu, UQI newval)
205 
{
206 
  int ilm = newval & 0x1f;
207 
  int current_ilm = CPU (h_ilm);
208 
 
209 
  /* We can only set new ilm values < 16 if the current ilm is < 16.  Otherwise
210 
     we add 16 to the value we are given.  */
211 
  if (current_ilm >= 16 && ilm < 16)
212 
    ilm += 16;
213 
 
214 
  CPU (h_ilm) = ilm;
215 
}
216 
 
217 
/* Cover fns to access the ps register.  */
218 
 
219 
USI
220 
fr30bf_h_ps_get_handler (SIM_CPU *current_cpu)
221 
{
222 
  int ccr = GET_H_CCR ();
223 
  int scr = GET_H_SCR ();
224 
  int ilm = GET_H_ILM ();
225 
 
226 
  return ccr | (scr << 8) | (ilm << 16);
227 
}
228 
 
229 
void
230 
fr30bf_h_ps_set_handler (SIM_CPU *current_cpu, USI newval)
231 
{
232 
  int ccr = newval & 0xff;
233 
  int scr = (newval >> 8) & 7;
234 
  int ilm = (newval >> 16) & 0x1f;
235 
 
236 
  SET_H_CCR (ccr);
237 
  SET_H_SCR (scr);
238 
  SET_H_ILM (ilm);
239 
}
240 
 
241 
/* Cover fns to access the dedicated registers.  */
242 
 
243 
SI
244 
fr30bf_h_dr_get_handler (SIM_CPU *current_cpu, UINT dr)
245 
{
246 
  switch (dr)
247 
    {
248 
    case H_DR_SSP :
249 
      if (! GET_H_SBIT ())
250 
        return GET_H_GR (H_GR_SP);
251 
      else
252 
        return CPU (h_dr[H_DR_SSP]);
253 
    case H_DR_USP :
254 
      if (GET_H_SBIT ())
255 
        return GET_H_GR (H_GR_SP);
256 
      else
257 
        return CPU (h_dr[H_DR_USP]);
258 
    case H_DR_TBR :
259 
    case H_DR_RP :
260 
    case H_DR_MDH :
261 
    case H_DR_MDL :
262 
      return CPU (h_dr[dr]);
263 
    }
264 
  return 0;
265 
}
266 
 
267 
void
268 
fr30bf_h_dr_set_handler (SIM_CPU *current_cpu, UINT dr, SI newval)
269 
{
270 
  switch (dr)
271 
    {
272 
    case H_DR_SSP :
273 
      if (! GET_H_SBIT ())
274 
        SET_H_GR (H_GR_SP, newval);
275 
      else
276 
        CPU (h_dr[H_DR_SSP]) = newval;
277 
      break;
278 
    case H_DR_USP :
279 
      if (GET_H_SBIT ())
280 
        SET_H_GR (H_GR_SP, newval);
281 
      else
282 
        CPU (h_dr[H_DR_USP]) = newval;
283 
      break;
284 
    case H_DR_TBR :
285 
    case H_DR_RP :
286 
    case H_DR_MDH :
287 
    case H_DR_MDL :
288 
      CPU (h_dr[dr]) = newval;
289 
      break;
290 
    }
291 
}
292 
 
293 
#if WITH_PROFILE_MODEL_P
294 
 
295 
/* FIXME: Some of these should be inline or macros.  Later.  */
296 
 
297 
/* Initialize cycle counting for an insn.
298 
   FIRST_P is non-zero if this is the first insn in a set of parallel
299 
   insns.  */
300 
 
301 
void
302 
fr30bf_model_insn_before (SIM_CPU *cpu, int first_p)
303 
{
304 
  MODEL_FR30_1_DATA *d = CPU_MODEL_DATA (cpu);
305 
  d->load_regs_pending = 0;
306 
}
307 
 
308 
/* Record the cycles computed for an insn.
309 
   LAST_P is non-zero if this is the last insn in a set of parallel insns,
310 
   and we update the total cycle count.
311 
   CYCLES is the cycle count of the insn.  */
312 
 
313 
void
314 
fr30bf_model_insn_after (SIM_CPU *cpu, int last_p, int cycles)
315 
{
316 
  PROFILE_DATA *p = CPU_PROFILE_DATA (cpu);
317 
  MODEL_FR30_1_DATA *d = CPU_MODEL_DATA (cpu);
318 
 
319 
  PROFILE_MODEL_TOTAL_CYCLES (p) += cycles;
320 
  PROFILE_MODEL_CUR_INSN_CYCLES (p) = cycles;
321 
  d->load_regs = d->load_regs_pending;
322 
}
323 
 
324 
static INLINE int
325 
check_load_stall (SIM_CPU *cpu, int regno)
326 
{
327 
  const MODEL_FR30_1_DATA *d = CPU_MODEL_DATA (cpu);
328 
  UINT load_regs = d->load_regs;
329 
 
330 
  if (regno != -1
331 
      && (load_regs & (1 << regno)) != 0)
332 
    {
333 
      PROFILE_DATA *p = CPU_PROFILE_DATA (cpu);
334 
      ++ PROFILE_MODEL_LOAD_STALL_CYCLES (p);
335 
      if (TRACE_INSN_P (cpu))
336 
        cgen_trace_printf (cpu, " ; Load stall.");
337 
      return 1;
338 
    }
339 
  else
340 
    return 0;
341 
}
342 
 
343 
int
344 
fr30bf_model_fr30_1_u_exec (SIM_CPU *cpu, const IDESC *idesc,
345 
                            int unit_num, int referenced,
346 
                            INT in_Ri, INT in_Rj, INT out_Ri)
347 
{
348 
  int cycles = idesc->timing->units[unit_num].done;
349 
  cycles += check_load_stall (cpu, in_Ri);
350 
  cycles += check_load_stall (cpu, in_Rj);
351 
  return cycles;
352 
}
353 
 
354 
int
355 
fr30bf_model_fr30_1_u_cti (SIM_CPU *cpu, const IDESC *idesc,
356 
                           int unit_num, int referenced,
357 
                           INT in_Ri)
358 
{
359 
  PROFILE_DATA *p = CPU_PROFILE_DATA (cpu);
360 
  /* (1 << 1): The pc is the 2nd element in inputs, outputs.
361 
     ??? can be cleaned up */
362 
  int taken_p = (referenced & (1 << 1)) != 0;
363 
  int cycles = idesc->timing->units[unit_num].done;
364 
  int delay_slot_p = CGEN_ATTR_VALUE (NULL, idesc->attrs, CGEN_INSN_DELAY_SLOT);
365 
 
366 
  cycles += check_load_stall (cpu, in_Ri);
367 
  if (taken_p)
368 
    {
369 
      /* ??? Handling cti's without delay slots this way will run afoul of
370 
         accurate system simulation.  Later.  */
371 
      if (! delay_slot_p)
372 
        {
373 
          ++cycles;
374 
          ++PROFILE_MODEL_CTI_STALL_CYCLES (p);
375 
        }
376 
      ++PROFILE_MODEL_TAKEN_COUNT (p);
377 
    }
378 
  else
379 
    ++PROFILE_MODEL_UNTAKEN_COUNT (p);
380 
 
381 
  return cycles;
382 
}
383 
 
384 
int
385 
fr30bf_model_fr30_1_u_load (SIM_CPU *cpu, const IDESC *idesc,
386 
                            int unit_num, int referenced,
387 
                            INT in_Rj, INT out_Ri)
388 
{
389 
  MODEL_FR30_1_DATA *d = CPU_MODEL_DATA (cpu);
390 
  int cycles = idesc->timing->units[unit_num].done;
391 
  d->load_regs_pending |= 1 << out_Ri;
392 
  cycles += check_load_stall (cpu, in_Rj);
393 
  return cycles;
394 
}
395 
 
396 
int
397 
fr30bf_model_fr30_1_u_store (SIM_CPU *cpu, const IDESC *idesc,
398 
                             int unit_num, int referenced,
399 
                             INT in_Ri, INT in_Rj)
400 
{
401 
  int cycles = idesc->timing->units[unit_num].done;
402 
  cycles += check_load_stall (cpu, in_Ri);
403 
  cycles += check_load_stall (cpu, in_Rj);
404 
  return cycles;
405 
}
406 
 
407 
int
408 
fr30bf_model_fr30_1_u_ldm (SIM_CPU *cpu, const IDESC *idesc,
409 
                           int unit_num, int referenced,
410 
                           INT reglist)
411 
{
412 
  return idesc->timing->units[unit_num].done;
413 
}
414 
 
415 
int
416 
fr30bf_model_fr30_1_u_stm (SIM_CPU *cpu, const IDESC *idesc,
417 
                           int unit_num, int referenced,
418 
                           INT reglist)
419 
{
420 
  return idesc->timing->units[unit_num].done;
421 
}
422 
 
423 
#endif /* WITH_PROFILE_MODEL_P */

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