sim-hw.c

这个是LINUX下的GDB调度工具的源码

/* Simulator hardware option handling.
   Copyright (C) 1998 Free Software Foundation, Inc.
   Contributed by Cygnus Support and Andrew Cagney.

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 2, 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, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "sim-main.h"
#include "sim-assert.h"
#include "sim-options.h"

#include "sim-hw.h"

#include "hw-tree.h"
#include "hw-device.h"
#include "hw-main.h"
#include "hw-base.h"


#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <ctype.h>
#include <errno.h>


struct sim_hw {
  struct hw *tree;
  int trace_p;
  int info_p;
  /* if called from a processor */
  sim_cpu *cpu;
  sim_cia cia;
};


struct hw *
sim_hw_parse (struct sim_state *sd,
	      const char *fmt,
	      ...)
{
  struct hw *current;
  va_list ap;
  va_start (ap, fmt);
  current = hw_tree_vparse (STATE_HW (sd)->tree, fmt, ap);
  va_end (ap);
  return current;
}

struct printer {
  struct sim_state *file;
  void (*print) (struct sim_state *, const char *, va_list ap);
};

static void
do_print (void *file, const char *fmt, ...)
{
  struct printer *p = file;
  va_list ap;
  va_start (ap, fmt);
  p->print (p->file, fmt, ap);
  va_end (ap);
}

void
sim_hw_print (struct sim_state *sd,
	      void (*print) (struct sim_state *, const char *, va_list ap))
{
  struct printer p;
  p.file = sd;
  p.print = print;
  hw_tree_print (STATE_HW (sd)->tree, do_print, &p);
}




/* command line options. */

enum {
  OPTION_HW_INFO = OPTION_START,
  OPTION_HW_TRACE,
  OPTION_HW_DEVICE,
  OPTION_HW_LIST,
  OPTION_HW_FILE,
};

static DECLARE_OPTION_HANDLER (hw_option_handler);

static const OPTION hw_options[] =
{
  { {"hw-info", no_argument, NULL, OPTION_HW_INFO },
      '\0', NULL, "List configurable hw regions",
      hw_option_handler },
  { {"info-hw", no_argument, NULL, OPTION_HW_INFO },
      '\0', NULL, NULL,
      hw_option_handler },

  { {"hw-trace", optional_argument, NULL, OPTION_HW_TRACE },
      '\0', "on|off", "Trace all hardware devices",
      hw_option_handler },
  { {"trace-hw", optional_argument, NULL, OPTION_HW_TRACE },
      '\0', NULL, NULL,
      hw_option_handler },

  { {"hw-device", required_argument, NULL, OPTION_HW_DEVICE },
      '\0', "DEVICE", "Add the specified device",
      hw_option_handler },

  { {"hw-list", no_argument, NULL, OPTION_HW_LIST },
      '\0', NULL, "List the device tree",
      hw_option_handler },

  { {"hw-file", required_argument, NULL, OPTION_HW_FILE },
      '\0', "FILE", "Add the devices listed in the file",
      hw_option_handler },

  { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }
};



/* Copied from ../ppc/psim.c:psim_merge_device_file() */

static SIM_RC
merge_device_file (struct sim_state *sd,
		   const char *file_name)
{
  FILE *description;
  struct hw *current = STATE_HW (sd)->tree;
  int line_nr;
  char device_path[1000];
  
  /* try opening the file */
  description = fopen (file_name, "r");
  if (description == NULL)
    {
      perror (file_name);
      return SIM_RC_FAIL;
    }
  
  line_nr = 0;
  while (fgets (device_path, sizeof(device_path), description))
    {
      char *device;
      /* check that a complete line was read */
      if (strchr (device_path, '\n') == NULL)
	{
	  fclose (description);
	  sim_io_eprintf (sd, "%s:%d: line to long", file_name, line_nr);
	  return SIM_RC_FAIL;
	}
      *strchr (device_path, '\n') = '\0';
      line_nr++;
      /* skip comments ("#" or ";") and blank lines lines */
      for (device = device_path;
	   *device != '\0' && isspace (*device);
	   device++);
      if (device[0] == '#'
	  || device[0] == ';'
	  || device[0] == '\0')
	continue;
      /* merge any appended lines */
      while (device_path[strlen (device_path) - 1] == '\\')
	{
	  int curlen = strlen (device_path) - 1;
	  /* zap the `\' at the end of the line */
	  device_path[curlen] = '\0';
	  /* append the next line */
	  if (!fgets (device_path + curlen,
		      sizeof (device_path) - curlen,
		      description))
	    {
	      fclose (description);
	      sim_io_eprintf (sd, "%s:%d: unexpected eof", file_name, line_nr);
	      return SIM_RC_FAIL;
	    }
	  if (strchr(device_path, '\n') == NULL)
	    {
	      fclose(description);
	      sim_io_eprintf (sd, "%s:%d: line to long", file_name, line_nr);
	      return SIM_RC_FAIL;
	    }
	  *strchr(device_path, '\n') = '\0';
	  line_nr++;
	}
      /* parse this line */
      current = hw_tree_parse (current, "%s", device);
    }
  fclose (description);
  return SIM_RC_OK;
}


static SIM_RC
hw_option_handler (struct sim_state *sd, sim_cpu *cpu, int opt,
		   char *arg, int is_command)
{
  switch (opt)
    {

    case OPTION_HW_INFO:
      {
	/* delay info until after the tree is finished */
	STATE_HW (sd)->info_p = 1;
	return SIM_RC_OK;
	break;
      }

    case OPTION_HW_TRACE:
      {
	if (arg == NULL)
	  {
	    STATE_HW (sd)->trace_p = 1;
	  }
	else if (strcmp (arg, "yes") == 0
		 || strcmp (arg, "on") == 0)
	  {
	    STATE_HW (sd)->trace_p = 1;
	  }
	else if (strcmp (arg, "no") == 0
		 || strcmp (arg, "off") == 0)
	  {
	    STATE_HW (sd)->trace_p = 0;
	  }
	else
	  {
	    sim_io_eprintf (sd, "Option --hw-trace ignored\n");
	    /* set tracing on all devices */
	    return SIM_RC_FAIL;
	  }
	/* FIXME: Not very nice - see also hw-base.c */
	if (STATE_HW (sd)->trace_p)
	  hw_tree_parse (STATE_HW (sd)->tree, "/global-trace? true");
	return SIM_RC_OK;
	break;
      }

    case OPTION_HW_DEVICE:
      {
	hw_tree_parse (STATE_HW (sd)->tree, arg);
	return SIM_RC_OK;
      }

    case OPTION_HW_LIST:
      {
	sim_hw_print (sd, sim_io_vprintf);
	return SIM_RC_OK;
      }
  
    case OPTION_HW_FILE:
      {
	return merge_device_file (sd, arg);
      }

    default:
      sim_io_eprintf (sd, "Unknown hw option %d\n", opt);
      return SIM_RC_FAIL;

    }

  return SIM_RC_FAIL;
}


/* "hw" module install handler.

   This is called via sim_module_install to install the "hw" subsystem
   into the simulator.  */

static MODULE_INIT_FN sim_hw_init;
static MODULE_UNINSTALL_FN sim_hw_uninstall;

SIM_RC
sim_hw_install (struct sim_state *sd)
{
  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  sim_add_option_table (sd, NULL, hw_options);
  sim_module_add_uninstall_fn (sd, sim_hw_uninstall);
  sim_module_add_init_fn (sd, sim_hw_init);
  STATE_HW (sd) = ZALLOC (struct sim_hw);
  STATE_HW (sd)->tree = hw_tree_create (sd, "core");
  return SIM_RC_OK;
}


static SIM_RC
sim_hw_init (struct sim_state *sd)
{
  /* FIXME: anything needed? */
  hw_tree_finish (STATE_HW (sd)->tree);
  if (STATE_HW (sd)->info_p)
    sim_hw_print (sd, sim_io_vprintf);
  return SIM_RC_OK;
}

/* Uninstall the "hw" subsystem from the simulator.  */

static void
sim_hw_uninstall (struct sim_state *sd)
{
  /* hw_tree_delete (STATE_HW (sd)->tree); */
  zfree (STATE_HW (sd));
  STATE_HW (sd) = NULL;
}



/* Data transfers to/from the hardware device tree.  There are several
   cases. */


/* CPU: The simulation is running and the current CPU/CIA
   initiates a data transfer. */

void 
sim_cpu_hw_io_read_buffer (sim_cpu *cpu,
			   sim_cia cia,
			   struct hw *hw,
			   void *dest,
			   int space,
			   unsigned_word addr,
			   unsigned nr_bytes)
{
  SIM_DESC sd = CPU_STATE (cpu);
  STATE_HW (sd)->cpu = cpu;
  STATE_HW (sd)->cia = cia;
  if (hw_io_read_buffer (hw, dest, space, addr, nr_bytes) != nr_bytes)
    sim_engine_abort (sd, cpu, cia, "broken CPU read");
}

void 
sim_cpu_hw_io_write_buffer (sim_cpu *cpu,
			    sim_cia cia,
			    struct hw *hw,
			    const void *source,
			    int space,
			    unsigned_word addr,
			    unsigned nr_bytes)
{
  SIM_DESC sd = CPU_STATE (cpu);
  STATE_HW (sd)->cpu = cpu;
  STATE_HW (sd)->cia = cia;
  if (hw_io_write_buffer (hw, source, space, addr, nr_bytes) != nr_bytes)
    sim_engine_abort (sd, cpu, cia, "broken CPU write");
}




/* SYSTEM: A data transfer is being initiated by the system. */

unsigned 
sim_hw_io_read_buffer (struct sim_state *sd,
		       struct hw *hw,
		       void *dest,
		       int space,
		       unsigned_word addr,
		       unsigned nr_bytes)
{
  STATE_HW (sd)->cpu = NULL;
  return hw_io_read_buffer (hw, dest, space, addr, nr_bytes);
}

unsigned
sim_hw_io_write_buffer (struct sim_state *sd,
			struct hw *hw,
			const void *source,
			int space,
			unsigned_word addr,
			unsigned nr_bytes)
{
  STATE_HW (sd)->cpu = NULL;
  return hw_io_write_buffer (hw, source, space, addr, nr_bytes);
}



/* Abort the simulation specifying HW as the reason */

void
hw_vabort (struct hw *me,
	   const char *fmt,
	   va_list ap)
{
  const char *name;
  char *msg;
  /* find an identity */
  if (me != NULL && hw_path (me) != NULL && hw_path (me) [0] != '\0')
    name = hw_path (me);
  else if (me != NULL && hw_name (me) != NULL && hw_name (me)[0] != '\0')
    name = hw_name (me);
  else if (me != NULL && hw_family (me) != NULL && hw_family (me)[0] != '\0')
    name = hw_family (me);
  else
    name = "device";
  /* construct an updated format string */
  msg = alloca (strlen (name) + strlen (": ") + strlen (fmt) + 1);
  strcpy (msg, name);
  strcat (msg, ": ");
  strcat (msg, fmt);
  /* report the problem */
  sim_engine_vabort (hw_system (me),
		     STATE_HW (hw_system (me))->cpu,
		     STATE_HW (hw_system (me))->cia,
		     msg, ap);
}

void
hw_abort (struct hw *me,
	  const char *fmt,
	  ...)
{
  va_list ap;
  /* report the problem */
  va_start (ap, fmt);
  hw_vabort (me, fmt, ap);
  va_end (ap);
}

void
sim_hw_abort (struct sim_state *sd,
	      struct hw *me,
	      const char *fmt,
	      ...)
{
  va_list ap;
  va_start (ap, fmt);
  if (me == NULL)
    sim_engine_vabort (sd, NULL, NULL_CIA, fmt, ap);
  else
    hw_vabort (me, fmt, ap);
  va_end (ap);
}


/* MISC routines to tie HW into the rest of the system */

void
hw_halt (struct hw *me,
	 int reason,
	 int status)
{
  struct sim_state *sd = hw_system (me);
  struct sim_hw *sim = STATE_HW (sd);
  sim_engine_halt (sd, sim->cpu, NULL, sim->cia, reason, status);
}

struct _sim_cpu *
hw_system_cpu (struct hw *me)
{
  return STATE_HW (hw_system (me))->cpu;
}

void
hw_trace (struct hw *me,
	  const char *fmt,
	  ...)
{
  if (hw_trace_p (me)) /* to be sure, to be sure */
    {
      va_list ap;
      va_start (ap, fmt);
      sim_io_eprintf (hw_system (me), "%s: ", hw_path (me));
      sim_io_evprintf (hw_system (me), fmt, ap);
      sim_io_eprintf (hw_system (me), "\n");
      va_end (ap);
    }
}


/* Based on gdb-4.17/sim/ppc/main.c:sim_io_read_stdin() */

int
do_hw_poll_read (struct hw *me,
		 do_hw_poll_read_method *read,
		 int sim_io_fd,
		 void *buf,
		 unsigned sizeof_buf)
{
  int status = read (hw_system (me), sim_io_fd, buf, sizeof_buf);
  if (status > 0)
    return status;
  else if (status == 0 && sizeof_buf == 0)
    return 0;
  else if (status == 0)
    return HW_IO_EOF;
  else /* status < 0 */
    {
#ifdef EAGAIN
      if (STATE_CALLBACK (hw_system (me))->last_errno == EAGAIN)
	return HW_IO_NOT_READY;
      else
	return HW_IO_EOF;
#else
      return HW_IO_EOF;
#endif
    }
}