sim/m32c/load.c

/* load.c --- loading object files into the M32C simulator.

Copyright (C) 2005-2023 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.

This file is part of the GNU simulators.

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

#include "bfd.h"

#include "cpu.h"
#include "mem.h"
#include "load.h"

int (*decode_opcode) (void) = 0;
int default_machine = 0;

void
m32c_set_mach (unsigned long mach)
{
  switch (mach)
    {
    case bfd_mach_m16c:
      m32c_set_cpu (CPU_M16C);
      if (verbose)
	fprintf (stderr, "[cpu: r8c/m16c]\n");
      break;
    case bfd_mach_m32c:
      m32c_set_cpu (CPU_M32C);
      if (verbose)
	fprintf (stderr, "[cpu: m32cm/m32c]\n");
      break;
    default:
      fprintf (stderr, "unknown m32c machine type 0x%lx\n", mach);
      decode_opcode = 0;
      break;
    }
}

void
m32c_load (bfd * prog)
{
  asection *s;
  unsigned long mach = bfd_get_mach (prog);
  unsigned long highest_addr_loaded = 0;

  if (mach == 0 && default_machine != 0)
    mach = default_machine;

  m32c_set_mach (mach);

  for (s = prog->sections; s; s = s->next)
    {
#if 0
      /* This was a good idea until we started storing the RAM data in
         ROM, at which point everything was all messed up.  The code
         remains as a reminder.  */
      if ((s->flags & SEC_ALLOC) && !(s->flags & SEC_READONLY))
	{
	  if (strcmp (bfd_section_name (s), ".stack"))
	    {
	      int secend =
		bfd_section_size (s) + bfd_section_lma (s);
	      if (heaptop < secend && bfd_section_lma (s) < 0x10000)
		{
		  heaptop = heapbottom = secend;
		}
	    }
	}
#endif
      if (s->flags & SEC_LOAD)
	{
	  char *buf;
	  bfd_size_type size;
	  bfd_vma base;

	  size = bfd_section_size (s);
	  if (size <= 0)
	    continue;

	  base = bfd_section_lma (s);
	  if (verbose)
	    fprintf (stderr, "[load a=%08" PRIx64 " s=%08x %s]\n",
		     (uint64_t) base, (int) size, bfd_section_name (s));
	  buf = (char *) malloc (size);
	  bfd_get_section_contents (prog, s, buf, 0, size);
	  mem_put_blk (base, buf, size);
	  free (buf);
	  if (highest_addr_loaded < base + size - 1 && size >= 4)
	    highest_addr_loaded = base + size - 1;
	}
    }

  if (strcmp (bfd_get_target (prog), "srec") == 0)
    {
      heaptop = heapbottom = 0;
      switch (mach)
	{
	case bfd_mach_m16c:
	  if (highest_addr_loaded > 0x10000)
	    regs.r_pc = mem_get_si (0x000ffffc) & membus_mask;
	  else
	    regs.r_pc = mem_get_si (0x000fffc) & membus_mask;
	  break;
	case bfd_mach_m32c:
	  regs.r_pc = mem_get_si (0x00fffffc) & membus_mask;
	  break;
	}
    }
  else
    regs.r_pc = prog->start_address;
  if (verbose)
    fprintf (stderr, "[start pc=%08x]\n", (unsigned int) regs.r_pc);
}