sim/common/sim-trace.c

/* Simulator tracing/debugging support.
   Copyright (C) 1997-2021 Free Software Foundation, Inc.
   Contributed by Cygnus Support.

This file is part of GDB, the GNU debugger.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This must come before any other includes.  */
#include "defs.h"

#include "sim-main.h"
#include "sim-io.h"
#include "sim-options.h"
#include "sim-fpu.h"
#include "sim/callback.h"

#include "bfd.h"
#include "libiberty.h"

#include "dis-asm.h"

#include "sim-assert.h"

#include <string.h>
#include <stdlib.h>

#ifndef SIZE_PHASE
#define SIZE_PHASE 8
#endif

#ifndef SIZE_LOCATION
#define SIZE_LOCATION 20
#endif

#ifndef SIZE_PC
#define SIZE_PC 6
#endif

#ifndef SIZE_LINE_NUMBER
#define SIZE_LINE_NUMBER 4
#endif

static MODULE_INIT_FN trace_init;
static MODULE_UNINSTALL_FN trace_uninstall;

static DECLARE_OPTION_HANDLER (trace_option_handler);

enum {
  OPTION_TRACE_INSN	= OPTION_START,
  OPTION_TRACE_DISASM,
  OPTION_TRACE_DECODE,
  OPTION_TRACE_EXTRACT,
  OPTION_TRACE_LINENUM,
  OPTION_TRACE_MEMORY,
  OPTION_TRACE_MODEL,
  OPTION_TRACE_ALU,
  OPTION_TRACE_CORE,
  OPTION_TRACE_EVENTS,
  OPTION_TRACE_FPU,
  OPTION_TRACE_BRANCH,
  OPTION_TRACE_SEMANTICS,
  OPTION_TRACE_RANGE,
  OPTION_TRACE_FUNCTION,
  OPTION_TRACE_DEBUG,
  OPTION_TRACE_FILE,
  OPTION_TRACE_VPU,
  OPTION_TRACE_SYSCALL,
  OPTION_TRACE_REGISTER
};

static const OPTION trace_options[] =
{
  /* This table is organized to group related instructions together.  */
  { {"trace", optional_argument, NULL, 't'},
      't', "on|off", "Trace useful things",
      trace_option_handler, NULL },
  { {"trace-insn", optional_argument, NULL, OPTION_TRACE_INSN},
      '\0', "on|off", "Perform instruction tracing",
      trace_option_handler, NULL },
  { {"trace-disasm", optional_argument, NULL, OPTION_TRACE_DISASM},
      '\0', "on|off", "Disassemble instructions (slower, but more accurate)",
      trace_option_handler, NULL },
  { {"trace-decode", optional_argument, NULL, OPTION_TRACE_DECODE},
      '\0', "on|off", "Trace instruction decoding",
      trace_option_handler, NULL },
  { {"trace-extract", optional_argument, NULL, OPTION_TRACE_EXTRACT},
      '\0', "on|off", "Trace instruction extraction",
      trace_option_handler, NULL },
  { {"trace-linenum", optional_argument, NULL, OPTION_TRACE_LINENUM},
      '\0', "on|off", "Perform line number tracing (implies --trace-insn)",
      trace_option_handler, NULL },
  { {"trace-memory", optional_argument, NULL, OPTION_TRACE_MEMORY},
      '\0', "on|off", "Trace memory operations",
      trace_option_handler, NULL },
  { {"trace-alu", optional_argument, NULL, OPTION_TRACE_ALU},
      '\0', "on|off", "Trace ALU (Arithmetic Logic Unit) operations",
      trace_option_handler, NULL },
  { {"trace-fpu", optional_argument, NULL, OPTION_TRACE_FPU},
      '\0', "on|off", "Trace FPU (Floating Point Unit) operations",
      trace_option_handler, NULL },
  { {"trace-vpu", optional_argument, NULL, OPTION_TRACE_VPU},
      '\0', "on|off", "Trace VPU (Vector Processing Unit) operations",
      trace_option_handler, NULL },
  { {"trace-branch", optional_argument, NULL, OPTION_TRACE_BRANCH},
      '\0', "on|off", "Trace branching",
      trace_option_handler, NULL },
  { {"trace-semantics", optional_argument, NULL, OPTION_TRACE_SEMANTICS},
      '\0', "on|off", "Perform ALU, FPU, VPU, MEMORY, and BRANCH tracing",
      trace_option_handler, NULL },
  { {"trace-model", optional_argument, NULL, OPTION_TRACE_MODEL},
      '\0', "on|off", "Include model performance data",
      trace_option_handler, NULL },
  { {"trace-core", optional_argument, NULL, OPTION_TRACE_CORE},
      '\0', "on|off", "Trace core operations",
      trace_option_handler, NULL },
  { {"trace-events", optional_argument, NULL, OPTION_TRACE_EVENTS},
      '\0', "on|off", "Trace events",
      trace_option_handler, NULL },
  { {"trace-syscall", optional_argument, NULL, OPTION_TRACE_SYSCALL},
      '\0', "on|off", "Trace system calls",
      trace_option_handler, NULL },
  { {"trace-register", optional_argument, NULL, OPTION_TRACE_REGISTER},
      '\0', "on|off", "Trace cpu register accesses",
      trace_option_handler, NULL },
#ifdef SIM_HAVE_ADDR_RANGE
  { {"trace-range", required_argument, NULL, OPTION_TRACE_RANGE},
      '\0', "START,END", "Specify range of addresses for instruction tracing",
      trace_option_handler, NULL },
#if 0 /*wip*/
  { {"trace-function", required_argument, NULL, OPTION_TRACE_FUNCTION},
      '\0', "FUNCTION", "Specify function to trace",
      trace_option_handler, NULL },
#endif
#endif
  { {"trace-debug", optional_argument, NULL, OPTION_TRACE_DEBUG},
      '\0', "on|off", "Add information useful for debugging the simulator to the tracing output",
      trace_option_handler, NULL },
  { {"trace-file", required_argument, NULL, OPTION_TRACE_FILE},
      '\0', "FILE NAME", "Specify tracing output file",
      trace_option_handler, NULL },
  { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
};

/* Set/reset the trace options indicated in MASK.  */

static SIM_RC
set_trace_option_mask (SIM_DESC sd, const char *name, int mask, const char *arg)
{
  int trace_nr;
  int cpu_nr;
  int trace_val = 1;

  if (arg != NULL)
    {
      if (strcmp (arg, "yes") == 0
	  || strcmp (arg, "on") == 0
	  || strcmp (arg, "1") == 0)
	trace_val = 1;
      else if (strcmp (arg, "no") == 0
	       || strcmp (arg, "off") == 0
	       || strcmp (arg, "0") == 0)
	trace_val = 0;
      else
	{
	  sim_io_eprintf (sd, "Argument `%s' for `--trace%s' invalid, one of `on', `off', `yes', `no' expected\n", arg, name);
	  return SIM_RC_FAIL;
	}
    }

  /* Update applicable trace bits.  */
  for (trace_nr = 0; trace_nr < MAX_TRACE_VALUES; ++trace_nr)
    {
      if ((mask & (1 << trace_nr)) == 0)
	continue;

      /* Set non-cpu specific values.  */
      STATE_TRACE_FLAGS (sd)[trace_nr] = trace_val;

      /* Set cpu values.  */
      for (cpu_nr = 0; cpu_nr < MAX_NR_PROCESSORS; cpu_nr++)
	{
	  CPU_TRACE_FLAGS (STATE_CPU (sd, cpu_nr))[trace_nr] = trace_val;
	}
    }

  /* Re-compute the cpu trace summary.  */
  if (trace_val)
    {
      for (cpu_nr = 0; cpu_nr < MAX_NR_PROCESSORS; cpu_nr++)
	CPU_TRACE_DATA (STATE_CPU (sd, cpu_nr))->trace_any_p = 1;
    }
  else
    {
      for (cpu_nr = 0; cpu_nr < MAX_NR_PROCESSORS; cpu_nr++)
	{
	  CPU_TRACE_DATA (STATE_CPU (sd, cpu_nr))->trace_any_p = 0;
	  for (trace_nr = 0; trace_nr < MAX_TRACE_VALUES; ++trace_nr)
	    {
	      if (CPU_TRACE_FLAGS (STATE_CPU (sd, cpu_nr))[trace_nr])
		{
		  CPU_TRACE_DATA (STATE_CPU (sd, cpu_nr))->trace_any_p = 1;
		  break;
		}
	    }
	}
    }

  return SIM_RC_OK;
}

/* Set one trace option based on its IDX value.  */

static SIM_RC
set_trace_option (SIM_DESC sd, const char *name, int idx, const char *arg)
{
  return set_trace_option_mask (sd, name, 1 << idx, arg);
}


static SIM_RC
trace_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
		      char *arg, int is_command)
{
  int n;

  switch (opt)
    {
    case 't' :
      if (!WITH_TRACE_ANY_P)
	sim_io_eprintf (sd, "Tracing not compiled in, `-t' ignored\n");
      else
	return set_trace_option_mask (sd, "trace", TRACE_USEFUL_MASK, arg);
      break;

    case OPTION_TRACE_INSN :
      if (WITH_TRACE_INSN_P)
	return set_trace_option (sd, "-insn", TRACE_INSN_IDX, arg);
      else
	sim_io_eprintf (sd, "Instruction tracing not compiled in, `--trace-insn' ignored\n");
      break;

    case OPTION_TRACE_DISASM :
      if (WITH_TRACE_DISASM_P)
	return set_trace_option (sd, "-disasm", TRACE_DISASM_IDX, arg);
      else
	sim_io_eprintf (sd, "Instruction tracing not compiled in, `--trace-disasm' ignored\n");
      break;

    case OPTION_TRACE_DECODE :
      if (WITH_TRACE_DECODE_P)
	return set_trace_option (sd, "-decode", TRACE_DECODE_IDX, arg);
      else
	sim_io_eprintf (sd, "Decode tracing not compiled in, `--trace-decode' ignored\n");
      break;

    case OPTION_TRACE_EXTRACT :
      if (WITH_TRACE_EXTRACT_P)
	return set_trace_option (sd, "-extract", TRACE_EXTRACT_IDX, arg);
      else
	sim_io_eprintf (sd, "Extract tracing not compiled in, `--trace-extract' ignored\n");
      break;

    case OPTION_TRACE_LINENUM :
      if (WITH_TRACE_LINENUM_P && WITH_TRACE_INSN_P)
	{
	  if (set_trace_option (sd, "-linenum", TRACE_LINENUM_IDX, arg) != SIM_RC_OK
	      || set_trace_option (sd, "-linenum", TRACE_INSN_IDX, arg) != SIM_RC_OK)
	    return SIM_RC_FAIL;
	}
      else
	sim_io_eprintf (sd, "Line number or instruction tracing not compiled in, `--trace-linenum' ignored\n");
      break;

    case OPTION_TRACE_MEMORY :
      if (WITH_TRACE_MEMORY_P)
	return set_trace_option (sd, "-memory", TRACE_MEMORY_IDX, arg);
      else
	sim_io_eprintf (sd, "Memory tracing not compiled in, `--trace-memory' ignored\n");
      break;

    case OPTION_TRACE_MODEL :
      if (WITH_TRACE_MODEL_P)
	return set_trace_option (sd, "-model", TRACE_MODEL_IDX, arg);
      else
	sim_io_eprintf (sd, "Model tracing not compiled in, `--trace-model' ignored\n");
      break;

    case OPTION_TRACE_ALU :
      if (WITH_TRACE_ALU_P)
	return set_trace_option (sd, "-alu", TRACE_ALU_IDX, arg);
      else
	sim_io_eprintf (sd, "ALU tracing not compiled in, `--trace-alu' ignored\n");
      break;

    case OPTION_TRACE_CORE :
      if (WITH_TRACE_CORE_P)
	return set_trace_option (sd, "-core", TRACE_CORE_IDX, arg);
      else
	sim_io_eprintf (sd, "CORE tracing not compiled in, `--trace-core' ignored\n");
      break;

    case OPTION_TRACE_EVENTS :
      if (WITH_TRACE_EVENTS_P)
	return set_trace_option (sd, "-events", TRACE_EVENTS_IDX, arg);
      else
	sim_io_eprintf (sd, "EVENTS tracing not compiled in, `--trace-events' ignored\n");
      break;

    case OPTION_TRACE_FPU :
      if (WITH_TRACE_FPU_P)
	return set_trace_option (sd, "-fpu", TRACE_FPU_IDX, arg);
      else
	sim_io_eprintf (sd, "FPU tracing not compiled in, `--trace-fpu' ignored\n");
      break;

    case OPTION_TRACE_VPU :
      if (WITH_TRACE_VPU_P)
	return set_trace_option (sd, "-vpu", TRACE_VPU_IDX, arg);
      else
	sim_io_eprintf (sd, "VPU tracing not compiled in, `--trace-vpu' ignored\n");
      break;

    case OPTION_TRACE_BRANCH :
      if (WITH_TRACE_BRANCH_P)
	return set_trace_option (sd, "-branch", TRACE_BRANCH_IDX, arg);
      else
	sim_io_eprintf (sd, "Branch tracing not compiled in, `--trace-branch' ignored\n");
      break;

    case OPTION_TRACE_SYSCALL :
      if (WITH_TRACE_SYSCALL_P)
	return set_trace_option (sd, "-syscall", TRACE_SYSCALL_IDX, arg);
      else
	sim_io_eprintf (sd, "System call tracing not compiled in, `--trace-syscall' ignored\n");
      break;

    case OPTION_TRACE_REGISTER :
      if (WITH_TRACE_REGISTER_P)
	return set_trace_option (sd, "-register", TRACE_REGISTER_IDX, arg);
      else
	sim_io_eprintf (sd, "Register tracing not compiled in, `--trace-register' ignored\n");
      break;

    case OPTION_TRACE_SEMANTICS :
      if (WITH_TRACE_ALU_P
	  && WITH_TRACE_FPU_P
	  && WITH_TRACE_MEMORY_P
	  && WITH_TRACE_BRANCH_P)
	{
	  if (set_trace_option (sd, "-semantics", TRACE_ALU_IDX, arg) != SIM_RC_OK
	      || set_trace_option (sd, "-semantics", TRACE_FPU_IDX, arg) != SIM_RC_OK
	      || set_trace_option (sd, "-semantics", TRACE_VPU_IDX, arg) != SIM_RC_OK
	      || set_trace_option (sd, "-semantics", TRACE_MEMORY_IDX, arg) != SIM_RC_OK
	      || set_trace_option (sd, "-semantics", TRACE_BRANCH_IDX, arg) != SIM_RC_OK)
	    return SIM_RC_FAIL;
	}
      else
	sim_io_eprintf (sd, "Alu, fpu, memory, and/or branch tracing not compiled in, `--trace-semantics' ignored\n");
      break;

#ifdef SIM_HAVE_ADDR_RANGE
    case OPTION_TRACE_RANGE :
      if (WITH_TRACE_ANY_P)
	{
	  int cpu_nr;
	  char *chp = arg;
	  unsigned long start,end;
	  start = strtoul (chp, &chp, 0);
	  if (*chp != ',')
	    {
	      sim_io_eprintf (sd, "--trace-range missing END argument\n");
	      return SIM_RC_FAIL;
	    }
	  end = strtoul (chp + 1, NULL, 0);
	  /* FIXME: Argument validation.  */
	  if (cpu != NULL)
	    sim_addr_range_add (TRACE_RANGE (CPU_PROFILE_DATA (cpu)),
				start, end);
	  else
	    for (cpu_nr = 0; cpu_nr < MAX_NR_PROCESSORS; ++cpu_nr)
	      sim_addr_range_add (TRACE_RANGE (CPU_TRACE_DATA (STATE_CPU (sd, cpu_nr))),
				  start, end);
	}
      else
	sim_io_eprintf (sd, "Tracing not compiled in, `--trace-range' ignored\n");
      break;

    case OPTION_TRACE_FUNCTION :
      if (WITH_TRACE_ANY_P)
	{
	  /*wip: need to compute function range given name*/
	}
      else
	sim_io_eprintf (sd, "Tracing not compiled in, `--trace-function' ignored\n");
      break;
#endif /* SIM_HAVE_ADDR_RANGE */

    case OPTION_TRACE_DEBUG :
      if (WITH_TRACE_DEBUG_P)
	return set_trace_option (sd, "-debug", TRACE_DEBUG_IDX, arg);
      else
	sim_io_eprintf (sd, "Tracing debug support not compiled in, `--trace-debug' ignored\n");
      break;

    case OPTION_TRACE_FILE :
      if (!WITH_TRACE_ANY_P)
	sim_io_eprintf (sd, "Tracing not compiled in, `--trace-file' ignored\n");
      else
	{
	  FILE *f = fopen (arg, "w");

	  if (f == NULL)
	    {
	      sim_io_eprintf (sd, "Unable to open trace output file `%s'\n", arg);
	      return SIM_RC_FAIL;
	    }
	  for (n = 0; n < MAX_NR_PROCESSORS; ++n)
	    TRACE_FILE (CPU_TRACE_DATA (STATE_CPU (sd, n))) = f;
	  TRACE_FILE (STATE_TRACE_DATA (sd)) = f;
	}
      break;
    }

  return SIM_RC_OK;
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
SIM_RC sim_install_trace (SIM_DESC sd);

/* Install tracing support.  */
SIM_RC
sim_install_trace (SIM_DESC sd)
{
  int i;

  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  sim_add_option_table (sd, NULL, trace_options);
  memset (STATE_TRACE_DATA (sd), 0, sizeof (* STATE_TRACE_DATA (sd)));
  for (i = 0; i < MAX_NR_PROCESSORS; ++i)
    memset (CPU_TRACE_DATA (STATE_CPU (sd, i)), 0,
	    sizeof (* CPU_TRACE_DATA (STATE_CPU (sd, i))));
  sim_module_add_init_fn (sd, trace_init);
  sim_module_add_uninstall_fn (sd, trace_uninstall);
  return SIM_RC_OK;
}

static SIM_RC
trace_init (SIM_DESC sd)
{
#ifdef SIM_HAVE_ADDR_RANGE
  /* Check if a range has been specified without specifying what to
     collect.  */
  {
    int i;

    for (i = 0; i < MAX_NR_PROCESSORS; ++i)
      {
	sim_cpu *cpu = STATE_CPU (sd, i);

	if (ADDR_RANGE_RANGES (TRACE_RANGE (CPU_TRACE_DATA (cpu)))
	    && ! TRACE_INSN_P (cpu))
	  {
	    sim_io_eprintf_cpu (cpu, "Tracing address range specified without --trace-insn.\n");
	    sim_io_eprintf_cpu (cpu, "Address range ignored.\n");
	    sim_addr_range_delete (TRACE_RANGE (CPU_TRACE_DATA (cpu)),
				   0, ~ (address_word) 0);
	  }
      }
  }
#endif

  return SIM_RC_OK;
}

static void
trace_uninstall (SIM_DESC sd)
{
  int i,j;
  FILE *sfile = TRACE_FILE (STATE_TRACE_DATA (sd));

  if (sfile != NULL)
    fclose (sfile);

  for (i = 0; i < MAX_NR_PROCESSORS; ++i)
    {
      FILE *cfile = TRACE_FILE (CPU_TRACE_DATA (STATE_CPU (sd, i)));
      if (cfile != NULL && cfile != sfile)
	{
	  /* If output from different cpus is going to the same file,
	     avoid closing the file twice.  */
	  for (j = 0; j < i; ++j)
	    if (TRACE_FILE (CPU_TRACE_DATA (STATE_CPU (sd, j))) == cfile)
	      break;
	  if (i == j)
	    fclose (cfile);
	}
    }

  if (STATE_PROG_SYMS (sd))
    free (STATE_PROG_SYMS (sd));
}

/* compute the nr of trace data units consumed by data */
static int
save_data_size (TRACE_DATA *data,
		long size)
{
  return ((size + sizeof (TRACE_INPUT_DATA (data) [0]) - 1)
	  / sizeof (TRACE_INPUT_DATA (data) [0]));
}


/* Archive DATA into the trace buffer */
void
save_data (SIM_DESC sd,
	   TRACE_DATA *data,
	   data_fmt fmt,
	   long size,
	   const void *buf)
{
  int i = TRACE_INPUT_IDX (data);
  if (i == sizeof (TRACE_INPUT_FMT (data)))
    sim_io_error (sd, "trace buffer overflow");
  TRACE_INPUT_FMT (data) [i] = fmt;
  TRACE_INPUT_SIZE (data) [i] = size;
  memcpy (&TRACE_INPUT_DATA (data) [i], buf, size);
  i += save_data_size (data, size);
  TRACE_INPUT_IDX (data) = i;
}

static void
print_data (SIM_DESC sd,
	    sim_cpu *cpu,
	    data_fmt fmt,
	    long size,
	    void *data)
{
  switch (fmt)
    {
    case trace_fmt_instruction_incomplete:
      trace_printf (sd, cpu, " (instruction incomplete)");
      break;
    case trace_fmt_word:
    case trace_fmt_addr:
      {
	switch (size)
	  {
	  case sizeof (unsigned32):
	    trace_printf (sd, cpu, " 0x%08lx", (long) * (unsigned32*) data);
	    break;
	  case sizeof (unsigned64):
	    trace_printf (sd, cpu, " 0x%08lx%08lx",
			  (long) ((* (unsigned64*) data) >> 32),
			  (long) * (unsigned64*) data);
	    break;
	  default:
	    abort ();
	  }
	break;
      }
    case trace_fmt_bool:
      {
	SIM_ASSERT (size == sizeof (int));
	trace_printf (sd, cpu, " %-8s",
		      (* (int*) data) ? "true" : "false");
	break;
      }
    case trace_fmt_fp:
      {
	sim_fpu fp;
	switch (size)
	  {
	    /* FIXME: Assumes sizeof float == 4; sizeof double == 8 */
	  case 4:
	    sim_fpu_32to (&fp, *(unsigned32*)data);
	    break;
	  case 8:
	    sim_fpu_64to (&fp, *(unsigned64*)data);
	    break;
	  default:
	    abort ();
	  }
	trace_printf (sd, cpu, " %8g", sim_fpu_2d (&fp));
	switch (size)
	  {
	  case 4:
	    trace_printf (sd, cpu, " (0x%08lx)",
			  (long) *(unsigned32*)data);
	    break;
	  case 8:
	    trace_printf (sd, cpu, " (0x%08lx%08lx)",
			  (long) (*(unsigned64*)data >> 32),
			  (long) (*(unsigned64*)data));
	    break;
	  default:
	    abort ();
	  }
	break;
      }
    case trace_fmt_fpu:
      /* FIXME: At present sim_fpu data is stored as a double */
      trace_printf (sd, cpu, " %8g", * (double*) data);
      break;
    case trace_fmt_string:
      trace_printf (sd, cpu, " %-8s", (char*) data);
      break;
    default:
      abort ();
    }
}

static const char *
trace_idx_to_str (int trace_idx)
{
  static char num[8];
  switch (trace_idx)
    {
    case TRACE_ALU_IDX:      return "alu:     ";
    case TRACE_INSN_IDX:     return "insn:    ";
    case TRACE_DISASM_IDX:   return "disasm:  ";
    case TRACE_DECODE_IDX:   return "decode:  ";
    case TRACE_EXTRACT_IDX:  return "extract: ";
    case TRACE_MEMORY_IDX:   return "memory:  ";
    case TRACE_CORE_IDX:     return "core:    ";
    case TRACE_EVENTS_IDX:   return "events:  ";
    case TRACE_FPU_IDX:      return "fpu:     ";
    case TRACE_BRANCH_IDX:   return "branch:  ";
    case TRACE_SYSCALL_IDX:  return "syscall: ";
    case TRACE_REGISTER_IDX: return "reg:     ";
    case TRACE_VPU_IDX:      return "vpu:     ";
    default:
      sprintf (num, "?%d?", trace_idx);
      return num;
    }
}

static void
trace_results (SIM_DESC sd,
	       sim_cpu *cpu,
	       int trace_idx,
	       int last_input)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int nr_out;
  int i;

  /* cross check trace_idx against TRACE_IDX (data)? */

  /* prefix */
  trace_printf (sd, cpu, "%s %s",
		trace_idx_to_str (TRACE_IDX (data)),
		TRACE_PREFIX (data));
  TRACE_IDX (data) = 0;

  for (i = 0, nr_out = 0;
       i < TRACE_INPUT_IDX (data);
       i += save_data_size (data, TRACE_INPUT_SIZE (data) [i]), nr_out++)
    {
      if (i == last_input)
	{
	  int pad = (strlen (" 0x") + sizeof (unsigned_word) * 2);
	  int padding = pad * (3 - nr_out);
	  if (padding < 0)
	    padding = 0;
	  padding += strlen (" ::");
	  trace_printf (sd, cpu, "%*s", padding, " ::");
	}
      print_data (sd, cpu,
		  TRACE_INPUT_FMT (data) [i],
		  TRACE_INPUT_SIZE (data) [i],
		  &TRACE_INPUT_DATA (data) [i]);
    }
  trace_printf (sd, cpu, "\n");
}

int
trace_load_symbols (SIM_DESC sd)
{
  bfd *abfd;
  asymbol **asymbols;
  long symsize;
  long symbol_count;

  /* Already loaded, so nothing to do.  */
  if (STATE_PROG_SYMS (sd))
    return 1;

  abfd = STATE_PROG_BFD (sd);
  if (abfd == NULL)
    return 0;

  symsize = bfd_get_symtab_upper_bound (abfd);
  if (symsize < 0)
    return 0;

  asymbols = xmalloc (symsize);
  symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
  if (symbol_count < 0)
    {
      free (asymbols);
      return 0;
    }

  STATE_PROG_SYMS (sd) = asymbols;
  STATE_PROG_SYMS_COUNT (sd) = symbol_count;
  return 1;
}

bfd_vma
trace_sym_value (SIM_DESC sd, const char *name)
{
  asymbol **asymbols;
  long i;

  if (!trace_load_symbols (sd))
    return -1;

  asymbols = STATE_PROG_SYMS (sd);

  for (i = 0; i < STATE_PROG_SYMS_COUNT (sd); ++i)
    if (strcmp (asymbols[i]->name, name) == 0)
      return bfd_asymbol_value (asymbols[i]);

  return -1;
}

void
trace_prefix (SIM_DESC sd,
	      sim_cpu *cpu,
	      sim_cia cia,
	      address_word pc,
	      int line_p,
	      const char *filename,
	      int linenum,
	      const char *fmt,
	      ...)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  va_list ap;
  char *prefix = TRACE_PREFIX (data);
  char *chp;
 /* FIXME: The TRACE_PREFIX_WIDTH should be determined at build time using
    known information about the disassembled instructions. */
#ifndef TRACE_PREFIX_WIDTH
#define TRACE_PREFIX_WIDTH 48
#endif
  int width = TRACE_PREFIX_WIDTH;

  /* if the previous trace data wasn't flushed, flush it now with a
     note indicating that the trace was incomplete. */
  if (TRACE_IDX (data) != 0)
    {
      int last_input = TRACE_INPUT_IDX (data);
      save_data (sd, data, trace_fmt_instruction_incomplete, 1, "");
      trace_results (sd, cpu, TRACE_IDX (data), last_input);
    }
  TRACE_IDX (data) = 0;
  TRACE_INPUT_IDX (data) = 0;

  /* Create the text prefix for this new instruction: */
  if (!line_p)
    {
      if (filename)
	{
	  sprintf (prefix, "%s:%-*d 0x%.*lx ",
		   filename,
		   SIZE_LINE_NUMBER, linenum,
		   SIZE_PC, (long) pc);
	}
      else
	{
	  sprintf (prefix, "0x%.*lx ",
		   SIZE_PC, (long) pc);
	  /* Shrink the width by the amount that we didn't print.  */
	  width -= SIZE_LINE_NUMBER + SIZE_PC + 8;
	}
      chp = strchr (prefix, '\0');
      va_start (ap, fmt);
      vsprintf (chp, fmt, ap);
      va_end (ap);
    }
  else
    {
      char buf[256];
      buf[0] = 0;
      if (STATE_TEXT_SECTION (sd)
	  && pc >= STATE_TEXT_START (sd)
	  && pc < STATE_TEXT_END (sd))
	{
	  const char *pc_filename = (const char *)0;
	  const char *pc_function = (const char *)0;
	  unsigned int pc_linenum = 0;
	  bfd *abfd;
	  asymbol **asymbols;

	  if (!trace_load_symbols (sd))
	    sim_engine_abort (sd, cpu, cia, "could not load symbols");

	  abfd = STATE_PROG_BFD (sd);
	  asymbols = STATE_PROG_SYMS (sd);

	  if (bfd_find_nearest_line (abfd, STATE_TEXT_SECTION (sd), asymbols,
				     pc - STATE_TEXT_START (sd),
				     &pc_filename, &pc_function, &pc_linenum))
	    {
	      char *p = buf;
	      if (pc_linenum)
		{
		  sprintf (p, "#%-*d ", SIZE_LINE_NUMBER, pc_linenum);
		  p += strlen (p);
		}
	      else
		{
		  sprintf (p, "%-*s ", SIZE_LINE_NUMBER+1, "---");
		  p += SIZE_LINE_NUMBER+2;
		}

	      if (pc_function)
		{
		  sprintf (p, "%s ", pc_function);
		  p += strlen (p);
		}
	      else if (pc_filename)
		{
		  char *q = (char *) strrchr (pc_filename, '/');
		  sprintf (p, "%s ", (q) ? q+1 : pc_filename);
		  p += strlen (p);
		}

	      if (*p == ' ')
		*p = '\0';
	    }
	}

      sprintf (prefix, "0x%.*x %-*.*s ",
	       SIZE_PC, (unsigned) pc,
	       SIZE_LOCATION, SIZE_LOCATION, buf);
      chp = strchr (prefix, '\0');
      va_start (ap, fmt);
      vsprintf (chp, fmt, ap);
      va_end (ap);
    }

  /* Pad it out to TRACE_PREFIX_WIDTH.  */
  chp = strchr (prefix, '\0');
  if (chp - prefix < width)
    {
      memset (chp, ' ', width - (chp - prefix));
      chp = &prefix [width];
      *chp = '\0';
    }
  strcpy (chp, " -");

  /* check that we've not over flowed the prefix buffer */
  if (strlen (prefix) >= sizeof (TRACE_PREFIX (data)))
    abort ();
}

void
trace_generic (SIM_DESC sd,
	       sim_cpu *cpu,
	       int trace_idx,
	       const char *fmt,
	       ...)
{
  va_list ap;
  trace_printf (sd, cpu, "%s %s",
		trace_idx_to_str (trace_idx),
		TRACE_PREFIX (CPU_TRACE_DATA (cpu)));
  va_start (ap, fmt);
  trace_vprintf (sd, cpu, fmt, ap);
  va_end (ap);
  trace_printf (sd, cpu, "\n");
}

static int
dis_read (bfd_vma memaddr, bfd_byte *myaddr, unsigned int length,
	  struct disassemble_info *dinfo)
{
  SIM_CPU *cpu = dinfo->application_data;
  sim_core_read_buffer (CPU_STATE (cpu), cpu, NULL_CIA, myaddr, memaddr, length);
  return 0;
}

static int ATTRIBUTE_PRINTF (2, 3)
dis_printf (SIM_CPU *cpu, const char *fmt, ...)
{
  SIM_DESC sd = CPU_STATE (cpu);
  va_list ap;
  va_start (ap, fmt);
  trace_vprintf (sd, cpu, fmt, ap);
  va_end (ap);
  return 0;
}

void
trace_disasm (SIM_DESC sd, sim_cpu *cpu, address_word addr)
{
  struct bfd *bfd = STATE_PROG_BFD (sd);
  TRACE_DATA *trace_data = CPU_TRACE_DATA (cpu);
  disassemble_info *info = &trace_data->dis_info;

  /* See if we need to set up the disassembly func.  */
  if (trace_data->dis_bfd != bfd)
    {
      trace_data->dis_bfd = bfd;
      trace_data->disassembler
	= disassembler (bfd_get_arch (trace_data->dis_bfd),
			bfd_big_endian (trace_data->dis_bfd),
			bfd_get_mach (trace_data->dis_bfd),
			trace_data->dis_bfd);
      INIT_DISASSEMBLE_INFO (*info, cpu, dis_printf);
      info->read_memory_func = dis_read;
      info->arch = bfd_get_arch (bfd);
      info->mach = bfd_get_mach (bfd);
      disassemble_init_for_target (info);
    }

  info->application_data = cpu;

  trace_printf (sd, cpu, "%s %s",
		trace_idx_to_str (TRACE_DISASM_IDX),
		TRACE_PREFIX (trace_data));
  trace_data->disassembler (addr, info);
  trace_printf (sd, cpu, "\n");
}

void
trace_input0 (SIM_DESC sd,
	      sim_cpu *cpu,
	      int trace_idx)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
}

void
trace_input_word1 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   unsigned_word d0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &d0);
}

void
trace_input_word2 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   unsigned_word d0,
		   unsigned_word d1)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &d0);
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &d1);
}

void
trace_input_word3 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   unsigned_word d0,
		   unsigned_word d1,
		   unsigned_word d2)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &d0);
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &d1);
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &d2);
}

void
trace_input_word4 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   unsigned_word d0,
		   unsigned_word d1,
		   unsigned_word d2,
		   unsigned_word d3)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_word, sizeof (d0), &d0);
  save_data (sd, data, trace_fmt_word, sizeof (d1), &d1);
  save_data (sd, data, trace_fmt_word, sizeof (d2), &d2);
  save_data (sd, data, trace_fmt_word, sizeof (d3), &d3);
}

void
trace_input_bool1 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   int d0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_bool, sizeof (d0), &d0);
}

void
trace_input_addr1 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   address_word d0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_addr, sizeof (d0), &d0);
}

void
trace_input_fp1 (SIM_DESC sd,
		 sim_cpu *cpu,
		 int trace_idx,
		 fp_word f0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f0);
}

void
trace_input_fp2 (SIM_DESC sd,
		 sim_cpu *cpu,
		 int trace_idx,
		 fp_word f0,
		 fp_word f1)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f0);
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f1);
}

void
trace_input_fp3 (SIM_DESC sd,
		 sim_cpu *cpu,
		 int trace_idx,
		 fp_word f0,
		 fp_word f1,
		 fp_word f2)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f0);
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f1);
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f2);
}

void
trace_input_fpu1 (SIM_DESC sd,
		  sim_cpu *cpu,
		  int trace_idx,
		  sim_fpu *f0)
{
  double d;
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  d = sim_fpu_2d (f0);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);
}

void
trace_input_fpu2 (SIM_DESC sd,
		  sim_cpu *cpu,
		  int trace_idx,
		  sim_fpu *f0,
		  sim_fpu *f1)
{
  double d;
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  d = sim_fpu_2d (f0);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);
  d = sim_fpu_2d (f1);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);
}

void
trace_input_fpu3 (SIM_DESC sd,
		  sim_cpu *cpu,
		  int trace_idx,
		  sim_fpu *f0,
		  sim_fpu *f1,
		  sim_fpu *f2)
{
  double d;
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  TRACE_IDX (data) = trace_idx;
  d = sim_fpu_2d (f0);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);
  d = sim_fpu_2d (f1);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);
  d = sim_fpu_2d (f2);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);
}

void
trace_result_word1 (SIM_DESC sd,
		    sim_cpu *cpu,
		    int trace_idx,
		    unsigned_word r0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &r0);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result0 (SIM_DESC sd,
	       sim_cpu *cpu,
	       int trace_idx)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_word2 (SIM_DESC sd,
		    sim_cpu *cpu,
		    int trace_idx,
		    unsigned_word r0,
		    unsigned_word r1)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_word, sizeof (r0), &r0);
  save_data (sd, data, trace_fmt_word, sizeof (r1), &r1);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_word4 (SIM_DESC sd,
		    sim_cpu *cpu,
		    int trace_idx,
		    unsigned_word r0,
		    unsigned_word r1,
		    unsigned_word r2,
		    unsigned_word r3)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_word, sizeof (r0), &r0);
  save_data (sd, data, trace_fmt_word, sizeof (r1), &r1);
  save_data (sd, data, trace_fmt_word, sizeof (r2), &r2);
  save_data (sd, data, trace_fmt_word, sizeof (r3), &r3);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_bool1 (SIM_DESC sd,
		    sim_cpu *cpu,
		    int trace_idx,
		    int r0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_bool, sizeof (r0), &r0);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_addr1 (SIM_DESC sd,
		    sim_cpu *cpu,
		    int trace_idx,
		    address_word r0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_addr, sizeof (r0), &r0);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_fp1 (SIM_DESC sd,
		  sim_cpu *cpu,
		  int trace_idx,
		  fp_word f0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_fp, sizeof (fp_word), &f0);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_fp2 (SIM_DESC sd,
		  sim_cpu *cpu,
		  int trace_idx,
		  fp_word f0,
		  fp_word f1)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_fp, sizeof (f0), &f0);
  save_data (sd, data, trace_fmt_fp, sizeof (f1), &f1);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_fpu1 (SIM_DESC sd,
		   sim_cpu *cpu,
		   int trace_idx,
		   sim_fpu *f0)
{
  double d;
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  d = sim_fpu_2d (f0);
  save_data (sd, data, trace_fmt_fp, sizeof (double), &d);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_string1 (SIM_DESC sd,
		      sim_cpu *cpu,
		      int trace_idx,
		      char *s0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_string, strlen (s0) + 1, s0);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_result_word1_string1 (SIM_DESC sd,
			    sim_cpu *cpu,
			    int trace_idx,
			    unsigned_word r0,
			    char *s0)
{
  TRACE_DATA *data = CPU_TRACE_DATA (cpu);
  int last_input;

  /* Append any results to the end of the inputs */
  last_input = TRACE_INPUT_IDX (data);
  save_data (sd, data, trace_fmt_word, sizeof (unsigned_word), &r0);
  save_data (sd, data, trace_fmt_string, strlen (s0) + 1, s0);

  trace_results (sd, cpu, trace_idx, last_input);
}

void
trace_vprintf (SIM_DESC sd, sim_cpu *cpu, const char *fmt, va_list ap)
{
  if (cpu != NULL)
    {
      if (TRACE_FILE (CPU_TRACE_DATA (cpu)) != NULL)
	vfprintf (TRACE_FILE (CPU_TRACE_DATA (cpu)), fmt, ap);
      else
	sim_io_evprintf (sd, fmt, ap);
    }
  else
    {
      if (TRACE_FILE (STATE_TRACE_DATA (sd)) != NULL)
	vfprintf (TRACE_FILE (STATE_TRACE_DATA (sd)), fmt, ap);
      else
	sim_io_evprintf (sd, fmt, ap);
    }
}

void
trace_printf (SIM_DESC sd, sim_cpu *cpu, const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);

  trace_vprintf (sd, cpu, fmt, ap);

  va_end (ap);
}

void
sim_debug_printf (sim_cpu *cpu, const char *fmt, ...)
{
  va_list ap;

  va_start (ap, fmt);

  if (CPU_DEBUG_FILE (cpu) == NULL)
    (* STATE_CALLBACK (CPU_STATE (cpu))->evprintf_filtered)
      (STATE_CALLBACK (CPU_STATE (cpu)), fmt, ap);
  else
    vfprintf (CPU_DEBUG_FILE (cpu), fmt, ap);

  va_end (ap);
}