Add support to GDB for the Renesas rl78 architecture.

1 files changed, 573 insertions, 0 deletions

diff --git a/sim/rl78/gdb-if.c b/sim/rl78/gdb-if.c
new file mode 100644
index 0000000..e7c1277
--- /dev/null
+++ b/sim/rl78/gdb-if.c
@@ -0,0 +1,573 @@
+/* gdb-if.c -- sim interface to GDB.
+
+Copyright (C) 2011-2012 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/>.  */
+
+#include "config.h"
+#include <stdio.h>
+#include <assert.h>
+#include <signal.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+#include "ansidecl.h"
+#include "gdb/callback.h"
+#include "gdb/remote-sim.h"
+#include "gdb/signals.h"
+#include "gdb/sim-rl78.h"
+
+#include "cpu.h"
+#include "mem.h"
+#include "load.h"
+#include "trace.h"
+
+/* Ideally, we'd wrap up all the minisim's data structures in an
+   object and pass that around.  However, neither GDB nor run needs
+   that ability.
+
+   So we just have one instance, that lives in global variables, and
+   each time we open it, we re-initialize it.  */
+
+struct sim_state
+{
+  const char *message;
+};
+
+static struct sim_state the_minisim = {
+  "This is the sole rl78 minisim instance."
+};
+
+static int open;
+
+static unsigned char hw_breakpoints[MEM_SIZE/8];
+
+static struct host_callback_struct *host_callbacks;
+
+/* Open an instance of the sim.  For this sim, only one instance
+   is permitted.  If sim_open() is called multiple times, the sim
+   will be reset.  */
+
+SIM_DESC
+sim_open (SIM_OPEN_KIND kind,
+	  struct host_callback_struct *callback,
+	  struct bfd *abfd, char **argv)
+{
+  if (open)
+    fprintf (stderr, "rl78 minisim: re-opened sim\n");
+
+  /* The 'run' interface doesn't use this function, so we don't care
+     about KIND; it's always SIM_OPEN_DEBUG.  */
+  if (kind != SIM_OPEN_DEBUG)
+    fprintf (stderr, "rl78 minisim: sim_open KIND != SIM_OPEN_DEBUG: %d\n",
+	     kind);
+
+  /* We use this for the load command.  Perhaps someday, it'll be used
+     for syscalls too.  */
+  host_callbacks = callback;
+
+  /* We don't expect any command-line arguments.  */
+
+  init_cpu ();
+  trace = 0;
+
+  sim_disasm_init (abfd);
+  open = 1;
+  return &the_minisim;
+}
+
+/* Verify the sim descriptor.  Just print a message if the descriptor
+   doesn't match.  Nothing bad will happen if the descriptor doesn't
+   match because all of the state is global.  But if it doesn't
+   match, that means there's a problem with the caller.  */
+
+static void
+check_desc (SIM_DESC sd)
+{
+  if (sd != &the_minisim)
+    fprintf (stderr, "rl78 minisim: desc != &the_minisim\n");
+}
+
+/* Close the sim.  */
+
+void
+sim_close (SIM_DESC sd, int quitting)
+{
+  check_desc (sd);
+
+  /* Not much to do.  At least free up our memory.  */
+  init_mem ();
+
+  open = 0;
+}
+
+/* Open the program to run; print a message if the program cannot
+   be opened.  */
+
+static bfd *
+open_objfile (const char *filename)
+{
+  bfd *prog = bfd_openr (filename, 0);
+
+  if (!prog)
+    {
+      fprintf (stderr, "Can't read %s\n", filename);
+      return 0;
+    }
+
+  if (!bfd_check_format (prog, bfd_object))
+    {
+      fprintf (stderr, "%s not a rl78 program\n", filename);
+      return 0;
+    }
+
+  return prog;
+}
+
+/* Load a program.  */
+
+SIM_RC
+sim_load (SIM_DESC sd, char *prog, struct bfd *abfd, int from_tty)
+{
+  check_desc (sd);
+
+  if (!abfd)
+    abfd = open_objfile (prog);
+  if (!abfd)
+    return SIM_RC_FAIL;
+
+  rl78_load (abfd, host_callbacks, "sim");
+
+  return SIM_RC_OK;
+}
+
+/* Create inferior.  */
+
+SIM_RC
+sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env)
+{
+  check_desc (sd);
+
+  if (abfd)
+    rl78_load (abfd, 0, "sim");
+
+  return SIM_RC_OK;
+}
+
+/* Read memory.  */
+
+int
+sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
+{
+  check_desc (sd);
+
+  if (mem >= MEM_SIZE)
+    return 0;
+  else if (mem + length > MEM_SIZE)
+    length = MEM_SIZE - mem;
+
+  mem_get_blk (mem, buf, length);
+  return length;
+}
+
+/* Write memory.  */
+
+int
+sim_write (SIM_DESC sd, SIM_ADDR mem, const unsigned char *buf, int length)
+{
+  check_desc (sd);
+
+  if (mem >= MEM_SIZE)
+    return 0;
+  else if (mem + length > MEM_SIZE)
+    length = MEM_SIZE - mem;
+
+  mem_put_blk (mem, buf, length);
+  return length;
+}
+
+/* Read the LENGTH bytes at BUF as an little-endian value.  */
+
+static SI
+get_le (unsigned char *buf, int length)
+{
+  SI acc = 0;
+
+  while (--length >= 0)
+    acc = (acc << 8) + buf[length];
+
+  return acc;
+}
+
+/* Store VAL as a little-endian value in the LENGTH bytes at BUF.  */
+
+static void
+put_le (unsigned char *buf, int length, SI val)
+{
+  int i;
+
+  for (i = 0; i < length; i++)
+    {
+      buf[i] = val & 0xff;
+      val >>= 8;
+    }
+}
+
+/* Verify that REGNO is in the proper range.  Return 0 if not and
+   something non-zero if so.  */
+
+static int
+check_regno (enum sim_rl78_regnum regno)
+{
+  return 0 <= regno && regno < sim_rl78_num_regs;
+}
+
+/* Return the size of the register REGNO.  */
+
+static size_t
+reg_size (enum sim_rl78_regnum regno)
+{
+  size_t size;
+
+  if (regno == sim_rl78_pc_regnum)
+    size = 4;
+  else
+    size = 1;
+
+  return size;
+}
+
+/* Return the register address associated with the register specified by
+   REGNO.  */
+
+static unsigned long
+reg_addr (enum sim_rl78_regnum regno)
+{
+  if (sim_rl78_bank0_r0_regnum <= regno
+      && regno <= sim_rl78_bank0_r7_regnum)
+    return 0xffef8 + (regno - sim_rl78_bank0_r0_regnum);
+  else if (sim_rl78_bank1_r0_regnum <= regno
+           && regno <= sim_rl78_bank1_r7_regnum)
+    return 0xffef0 + (regno - sim_rl78_bank1_r0_regnum);
+  else if (sim_rl78_bank2_r0_regnum <= regno
+           && regno <= sim_rl78_bank2_r7_regnum)
+    return 0xffee8 + (regno - sim_rl78_bank2_r0_regnum);
+  else if (sim_rl78_bank3_r0_regnum <= regno
+           && regno <= sim_rl78_bank3_r7_regnum)
+    return 0xffee0 + (regno - sim_rl78_bank3_r0_regnum);
+  else if (regno == sim_rl78_psw_regnum)
+    return 0xffffa;
+  else if (regno == sim_rl78_es_regnum)
+    return 0xffffd;
+  else if (regno == sim_rl78_cs_regnum)
+    return 0xffffc;
+  /* Note: We can't handle PC here because it's not memory mapped.  */
+  else if (regno == sim_rl78_spl_regnum)
+    return 0xffff8;
+  else if (regno == sim_rl78_sph_regnum)
+    return 0xffff9;
+  else if (regno == sim_rl78_pmc_regnum)
+    return 0xffffe;
+  else if (regno == sim_rl78_mem_regnum)
+    return 0xfffff;
+
+  return 0;
+}
+
+/* Fetch the contents of the register specified by REGNO, placing the
+   contents in BUF.  The length LENGTH must match the sim's internal
+   notion of the register's size.  */
+
+int
+sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
+{
+  size_t size;
+  SI val;
+
+  check_desc (sd);
+
+  if (!check_regno (regno))
+    return 0;
+
+  size = reg_size (regno);
+
+  if (length != size)
+    return 0;
+
+  if (regno == sim_rl78_pc_regnum)
+    val = pc;
+  else
+    val = memory[reg_addr (regno)];
+
+  put_le (buf, length, val);
+
+  return size;
+}
+
+/* Store the value stored in BUF to the register REGNO.  The length
+   LENGTH must match the sim's internal notion of the register size.  */
+
+int
+sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
+{
+  size_t size;
+  SI val;
+
+  check_desc (sd);
+
+  if (!check_regno (regno))
+    return -1;
+
+  size = reg_size (regno);
+
+  if (length != size)
+    return -1;
+
+  val = get_le (buf, length);
+
+  if (regno == sim_rl78_pc_regnum)
+    pc = val;
+  else
+    memory[reg_addr (regno)] = val;
+  return size;
+}
+
+/* Print out message associated with "info target".  */
+
+void
+sim_info (SIM_DESC sd, int verbose)
+{
+  check_desc (sd);
+
+  printf ("The rl78 minisim doesn't collect any statistics.\n");
+}
+
+static volatile int stop;
+static enum sim_stop reason;
+int siggnal;
+
+
+/* Given a signal number used by the rl78 bsp (that is, newlib),
+   return the corresponding signal numbers.  */
+
+int
+rl78_signal_to_target (int sig)
+{
+  switch (sig)
+    {
+    case 4:
+      return TARGET_SIGNAL_ILL;
+
+    case 5:
+      return TARGET_SIGNAL_TRAP;
+
+    case 10:
+      return TARGET_SIGNAL_BUS;
+
+    case 11:
+      return TARGET_SIGNAL_SEGV;
+
+    case 24:
+      return TARGET_SIGNAL_XCPU;
+      break;
+
+    case 2:
+      return TARGET_SIGNAL_INT;
+
+    case 8:
+      return TARGET_SIGNAL_FPE;
+      break;
+
+    case 6:
+      return TARGET_SIGNAL_ABRT;
+    }
+
+  return 0;
+}
+
+
+/* Take a step return code RC and set up the variables consulted by
+   sim_stop_reason appropriately.  */
+
+void
+handle_step (int rc)
+{
+  if (RL78_STEPPED (rc) || RL78_HIT_BREAK (rc))
+    {
+      reason = sim_stopped;
+      siggnal = TARGET_SIGNAL_TRAP;
+    }
+  else if (RL78_STOPPED (rc))
+    {
+      reason = sim_stopped;
+      siggnal = rl78_signal_to_target (RL78_STOP_SIG (rc));
+    }
+  else
+    {
+      assert (RL78_EXITED (rc));
+      reason = sim_exited;
+      siggnal = RL78_EXIT_STATUS (rc);
+    }
+}
+
+
+/* Resume execution after a stop.  */
+
+void
+sim_resume (SIM_DESC sd, int step, int sig_to_deliver)
+{
+  int rc;
+
+  check_desc (sd);
+
+  if (sig_to_deliver != 0)
+    {
+      fprintf (stderr,
+	       "Warning: the rl78 minisim does not implement "
+	       "signal delivery yet.\n" "Resuming with no signal.\n");
+    }
+
+      /* We don't clear 'stop' here, because then we would miss
+         interrupts that arrived on the way here.  Instead, we clear
+         the flag in sim_stop_reason, after GDB has disabled the
+         interrupt signal handler.  */
+  for (;;)
+    {
+      if (stop)
+	{
+	  stop = 0;
+	  reason = sim_stopped;
+	  siggnal = TARGET_SIGNAL_INT;
+	  break;
+	}
+
+      if (hw_breakpoints[pc >> 3]
+          && (hw_breakpoints[pc >> 3] & (1 << (pc & 0x7))))
+	{
+	  reason = sim_stopped;
+	  siggnal = TARGET_SIGNAL_TRAP;
+	  break;
+	}
+      rc = setjmp (decode_jmp_buf);
+      if (rc == 0)
+	rc = decode_opcode ();
+
+      if (!RL78_STEPPED (rc) || step)
+	{
+	  handle_step (rc);
+	  break;
+	}
+    }
+}
+
+/* Stop the sim.  */
+
+int
+sim_stop (SIM_DESC sd)
+{
+  stop = 1;
+
+  return 1;
+}
+
+/* Fetch the stop reason and signal.  */
+
+void
+sim_stop_reason (SIM_DESC sd, enum sim_stop *reason_p, int *sigrc_p)
+{
+  check_desc (sd);
+
+  *reason_p = reason;
+  *sigrc_p = siggnal;
+}
+
+/* Execute the sim-specific command associated with GDB's "sim ..."
+   command.  */
+
+void
+sim_do_command (SIM_DESC sd, char *cmd)
+{
+  char *args;
+
+  check_desc (sd);
+
+  if (cmd == NULL)
+    {
+      cmd = "";
+      args = "";
+    }
+  else
+    {
+      char *p = cmd;
+
+      /* Skip leading whitespace.  */
+      while (isspace (*p))
+	p++;
+
+      /* Find the extent of the command word.  */
+      for (p = cmd; *p; p++)
+	if (isspace (*p))
+	  break;
+
+      /* Null-terminate the command word, and record the start of any
+	 further arguments.  */
+      if (*p)
+	{
+	  *p = '\0';
+	  args = p + 1;
+	  while (isspace (*args))
+	    args++;
+	}
+      else
+	args = p;
+    }
+
+  if (strcmp (cmd, "trace") == 0)
+    {
+      if (strcmp (args, "on") == 0)
+	trace = 1;
+      else if (strcmp (args, "off") == 0)
+	trace = 0;
+      else
+	printf ("The 'sim trace' command expects 'on' or 'off' "
+		"as an argument.\n");
+    }
+  else if (strcmp (cmd, "verbose") == 0)
+    {
+      if (strcmp (args, "on") == 0)
+	verbose = 1;
+      else if (strcmp (args, "noisy") == 0)
+	verbose = 2;
+      else if (strcmp (args, "off") == 0)
+	verbose = 0;
+      else
+	printf ("The 'sim verbose' command expects 'on', 'noisy', or 'off'"
+		" as an argument.\n");
+    }
+  else
+    printf ("The 'sim' command expects either 'trace' or 'verbose'"
+	    " as a subcommand.\n");
+}
+
+/* Stub for command completion.  */
+
+char **
+sim_complete_command (SIM_DESC sd, char *text, char *word)
+{
+    return NULL;
+}