3e38efa06e
is to allow the simulator initialisation code to make use of the host callback facilities. Had discussed this with sac, and it should be a harmless change since none of the other simulators really make use of the call, and it does not return a result.
469 lines
12 KiB
C
469 lines
12 KiB
C
/* Generic remote debugging interface for simulators.
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Copyright 1993, 1994 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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Steve Chamberlain (sac@cygnus.com).
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "wait.h"
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#include "value.h"
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#include "gdb_string.h"
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#include <ctype.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <errno.h>
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#include "terminal.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "remote-sim.h"
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#include "remote-utils.h"
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#include "callback.h"
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/* Naming convention:
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sim_* are the interface to the simulator (see remote-sim.h).
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sim_callback_* are the stuff which the simulator can see inside GDB.
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gdbsim_* are stuff which is internal to gdb. */
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/* Forward data declarations */
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extern struct target_ops gdbsim_ops;
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static int program_loaded = 0;
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static void
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dump_mem (buf, len)
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char *buf;
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int len;
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{
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if (len <= 8)
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{
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if (len == 8 || len == 4)
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{
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long l[2];
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memcpy (l, buf, len);
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printf_filtered ("\t0x%x", l[0]);
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printf_filtered (len == 8 ? " 0x%x\n" : "\n", l[1]);
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}
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else
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{
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int i;
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printf_filtered ("\t");
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for (i = 0; i < len; i++)
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printf_filtered ("0x%x ", buf[i]);
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printf_filtered ("\n");
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}
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}
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}
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static void
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gdbsim_fetch_register (regno)
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int regno;
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{
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if (regno == -1)
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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gdbsim_fetch_register (regno);
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}
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else
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{
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char buf[MAX_REGISTER_RAW_SIZE];
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sim_fetch_register (regno, buf);
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supply_register (regno, buf);
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if (sr_get_debug ())
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{
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printf_filtered ("gdbsim_fetch_register: %d", regno);
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/* FIXME: We could print something more intelligible. */
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dump_mem (buf, REGISTER_RAW_SIZE (regno));
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}
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}
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}
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static void
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gdbsim_store_register (regno)
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int regno;
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{
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if (regno == -1)
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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gdbsim_store_register (regno);
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}
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else
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{
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/* FIXME: Until read_register() returns LONGEST, we have this. */
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char tmp[MAX_REGISTER_RAW_SIZE];
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read_register_gen (regno, tmp);
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sim_store_register (regno, tmp);
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if (sr_get_debug ())
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{
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printf_filtered ("gdbsim_store_register: %d", regno);
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/* FIXME: We could print something more intelligible. */
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dump_mem (tmp, REGISTER_RAW_SIZE (regno));
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}
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}
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}
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/* Kill the running program. This may involve closing any open files
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and releasing other resources acquired by the simulated program. */
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static void
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gdbsim_kill ()
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_kill\n");
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sim_kill (); /* close fd's, remove mappings */
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inferior_pid = 0;
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}
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/* Load an executable file into the target process. This is expected to
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not only bring new code into the target process, but also to update
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GDB's symbol tables to match. */
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static void
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gdbsim_load (prog, fromtty)
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char *prog;
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int fromtty;
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_load: prog \"%s\"\n", prog);
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inferior_pid = 0;
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/* This must be done before calling gr_load_image. */
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program_loaded = 1;
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if (sim_load (prog, fromtty) != 0)
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generic_load (prog, fromtty);
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}
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/* Start an inferior process and set inferior_pid to its pid.
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EXEC_FILE is the file to run.
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ALLARGS is a string containing the arguments to the program.
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ENV is the environment vector to pass. Errors reported with error().
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On VxWorks and various standalone systems, we ignore exec_file. */
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/* This is called not only when we first attach, but also when the
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user types "run" after having attached. */
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static void
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gdbsim_create_inferior (exec_file, args, env)
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char *exec_file;
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char *args;
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char **env;
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{
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int len;
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char *arg_buf,**argv;
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CORE_ADDR entry_pt;
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if (! program_loaded)
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error ("No program loaded.");
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if (sr_get_debug ())
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printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n",
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exec_file, args);
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if (exec_file == 0 || exec_bfd == 0)
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error ("No exec file specified.");
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entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd);
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gdbsim_kill (NULL, NULL);
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remove_breakpoints ();
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init_wait_for_inferior ();
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len = 5 + strlen (exec_file) + 1 + strlen (args) + 1 + /*slop*/ 10;
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arg_buf = (char *) alloca (len);
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arg_buf[0] = '\0';
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strcat (arg_buf, exec_file);
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strcat (arg_buf, " ");
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strcat (arg_buf, args);
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argv = buildargv (arg_buf);
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make_cleanup (freeargv, (char *) argv);
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sim_create_inferior (entry_pt, argv, env);
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inferior_pid = 42;
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insert_breakpoints (); /* Needed to get correct instruction in cache */
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proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0);
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}
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/* The open routine takes the rest of the parameters from the command,
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and (if successful) pushes a new target onto the stack.
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Targets should supply this routine, if only to provide an error message. */
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/* Called when selecting the simulator. EG: (gdb) target sim name. */
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static void
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gdbsim_open (args, from_tty)
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char *args;
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int from_tty;
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_open: args \"%s\"\n", args ? args : "(null)");
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sim_set_callbacks (&default_callback);
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default_callback.init (&default_callback);
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sim_open (args);
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push_target (&gdbsim_ops);
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target_fetch_registers (-1);
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printf_filtered ("Connected to the simulator.\n");
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}
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/* Does whatever cleanup is required for a target that we are no longer
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going to be calling. Argument says whether we are quitting gdb and
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should not get hung in case of errors, or whether we want a clean
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termination even if it takes a while. This routine is automatically
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always called just before a routine is popped off the target stack.
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Closing file descriptors and freeing memory are typical things it should
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do. */
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/* Close out all files and local state before this target loses control. */
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static void
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gdbsim_close (quitting)
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int quitting;
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_close: quitting %d\n", quitting);
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program_loaded = 0;
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sim_close (quitting);
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}
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/* Takes a program previously attached to and detaches it.
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The program may resume execution (some targets do, some don't) and will
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no longer stop on signals, etc. We better not have left any breakpoints
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in the program or it'll die when it hits one. ARGS is arguments
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typed by the user (e.g. a signal to send the process). FROM_TTY
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says whether to be verbose or not. */
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/* Terminate the open connection to the remote debugger.
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Use this when you want to detach and do something else with your gdb. */
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static void
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gdbsim_detach (args,from_tty)
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char *args;
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int from_tty;
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_detach: args \"%s\"\n", args);
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pop_target (); /* calls gdbsim_close to do the real work */
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if (from_tty)
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printf_filtered ("Ending simulator %s debugging\n", target_shortname);
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}
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/* Resume execution of the target process. STEP says whether to single-step
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or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given
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to the target, or zero for no signal. */
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static void
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gdbsim_resume (pid, step, siggnal)
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int pid, step;
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enum target_signal siggnal;
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal);
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sim_resume (step, target_signal_to_host (siggnal));
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}
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/* Wait for inferior process to do something. Return pid of child,
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or -1 in case of error; store status through argument pointer STATUS,
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just as `wait' would. */
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static int
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gdbsim_wait (pid, status)
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int pid;
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struct target_waitstatus *status;
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{
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int sigrc;
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enum sim_stop reason;
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if (sr_get_debug ())
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printf_filtered ("gdbsim_wait\n");
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sim_stop_reason (&reason, &sigrc);
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switch (reason)
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{
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case sim_exited:
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status->kind = TARGET_WAITKIND_EXITED;
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status->value.integer = sigrc;
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break;
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case sim_stopped:
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status->kind = TARGET_WAITKIND_STOPPED;
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/* The signal in sigrc is a host signal. That probably
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should be fixed. */
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status->value.sig = target_signal_from_host (sigrc);
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break;
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case sim_signalled:
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status->kind = TARGET_WAITKIND_SIGNALLED;
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/* The signal in sigrc is a host signal. That probably
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should be fixed. */
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status->value.sig = target_signal_from_host (sigrc);
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break;
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}
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return inferior_pid;
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}
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/* Get ready to modify the registers array. On machines which store
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individual registers, this doesn't need to do anything. On machines
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which store all the registers in one fell swoop, this makes sure
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that registers contains all the registers from the program being
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debugged. */
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static void
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gdbsim_prepare_to_store ()
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{
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/* Do nothing, since we can store individual regs */
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}
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static int
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gdbsim_xfer_inferior_memory (memaddr, myaddr, len, write, target)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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int write;
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struct target_ops *target; /* ignored */
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{
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if (! program_loaded)
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error ("No program loaded.");
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if (sr_get_debug ())
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{
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printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x%x, memaddr 0x%x, len %d, write %d\n",
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myaddr, memaddr, len, write);
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if (sr_get_debug () && write)
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dump_mem(myaddr, len);
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}
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if (write)
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{
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len = sim_write (memaddr, myaddr, len);
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}
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else
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{
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len = sim_read (memaddr, myaddr, len);
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if (sr_get_debug () && len > 0)
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dump_mem(myaddr, len);
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}
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return len;
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}
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static void
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gdbsim_files_info (target)
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struct target_ops *target;
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{
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char *file = "nothing";
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if (exec_bfd)
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file = bfd_get_filename (exec_bfd);
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if (sr_get_debug ())
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printf_filtered ("gdbsim_files_info: file \"%s\"\n", file);
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if (exec_bfd)
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{
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printf_filtered ("\tAttached to %s running program %s\n",
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target_shortname, file);
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sim_info (0);
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}
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}
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/* Clear the simulator's notion of what the break points are. */
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static void
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gdbsim_mourn_inferior ()
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{
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if (sr_get_debug ())
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printf_filtered ("gdbsim_mourn_inferior:\n");
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remove_breakpoints ();
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generic_mourn_inferior ();
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}
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/* Put a command string, in args, out to MONITOR. Output from MONITOR
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is placed on the users terminal until the prompt is seen. FIXME: We
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read the characters ourseleves here cause of a nasty echo. */
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static void
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simulator_command (args, from_tty)
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char *args;
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int from_tty;
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{
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sim_do_command (args);
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}
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/* Define the target subroutine names */
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struct target_ops gdbsim_ops = {
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"sim", /* to_shortname */
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"simulator", /* to_longname */
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"Use the compiled-in simulator.", /* to_doc */
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gdbsim_open, /* to_open */
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gdbsim_close, /* to_close */
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NULL, /* to_attach */
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gdbsim_detach, /* to_detach */
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gdbsim_resume, /* to_resume */
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gdbsim_wait, /* to_wait */
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gdbsim_fetch_register, /* to_fetch_registers */
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gdbsim_store_register, /* to_store_registers */
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gdbsim_prepare_to_store, /* to_prepare_to_store */
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gdbsim_xfer_inferior_memory, /* to_xfer_memory */
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gdbsim_files_info, /* to_files_info */
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memory_insert_breakpoint, /* to_insert_breakpoint */
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memory_remove_breakpoint, /* to_remove_breakpoint */
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NULL, /* to_terminal_init */
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NULL, /* to_terminal_inferior */
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NULL, /* to_terminal_ours_for_output */
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NULL, /* to_terminal_ours */
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NULL, /* to_terminal_info */
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gdbsim_kill, /* to_kill */
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gdbsim_load, /* to_load */
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NULL, /* to_lookup_symbol */
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gdbsim_create_inferior, /* to_create_inferior */
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gdbsim_mourn_inferior, /* to_mourn_inferior */
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0, /* to_can_run */
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0, /* to_notice_signals */
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0, /* to_thread_alive */
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0, /* to_stop */
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process_stratum, /* to_stratum */
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NULL, /* to_next */
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1, /* to_has_all_memory */
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1, /* to_has_memory */
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1, /* to_has_stack */
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1, /* to_has_registers */
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1, /* to_has_execution */
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NULL, /* sections */
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NULL, /* sections_end */
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OPS_MAGIC, /* to_magic */
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};
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void
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_initialize_remote_sim ()
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{
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add_target (&gdbsim_ops);
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add_com ("sim <command>", class_obscure, simulator_command,
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"Send a command to the simulator.");
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}
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