471 lines
11 KiB
C
471 lines
11 KiB
C
/* Generic remote debugging interface for simulators.
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Copyright 1993 Free Software Foundation, Inc.
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Contributed by Cygnus Support. Hacked from Steve Chamberlain's Z8000 work
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by Doug Evans. (dje@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., 675 Mass Ave, Cambridge, MA 02139, 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 <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 "simif.h"
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/* Naming conventions:
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sim_xxx are internal objects that describe top level interfaces to the
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simulator.
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simif_xxx are external counterparts to the sim_xxx objects that must be
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provided by the simulator (simif for SIMulator InterFace, duh...).
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A complete list of them is:
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--- Fetch one register and store the raw value in BUF.
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int simif_fetch_register (int regno, char *buf);
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--- Store VAL in one register.
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int simif_store_register (int regno, char *val);
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--- Complete terminate the simulator. This includes freeing all memory,
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closing all open files, and releasing all mmap'd memory.
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int simif_kill (void);
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--- Load program PROG into the simulator.
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int simif_load (bfd *abfd, char *prog);
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--- Set the arguments and environment for the program loaded into the
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simulator. ARGV and ENV are NULL terminated lists of pointers.
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int simif_set_args (char **argv, char **env);
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--- Initialize the simulator. This function is called when the simulator
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is selected from the command line. ARGS is passed from the command line
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and can be used to select whatever run time options the simulator provides.
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ARGS is the raw character string and must be parsed by the simulator.
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int simif_open (char *args);
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--- Start running the program, or resume it after a breakpoint.
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FIXME: What are A and B?
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int simif_resume (int a, int b);
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--- Fetch the reason why the program stopped running (breakpoint, signal,
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etc.)
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WAITTYPE simif_stop_signal (void);
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--- Write some data into the program's memory.
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Result is 0 for success, nonzero for failure.
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int simif_write (CORE_ADDR memaddr, char *myaddr, int len);
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--- Read some data from the program's memory.
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Result is 0 for success, nonzero for failure.
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int simif_read (CORE_ADDR memaddr, char *myaddr, int len);
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*/
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/* Forward data declarations */
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extern struct target_ops sim_ops;
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int sim_verbose = 0; /* available to the simulator to use */
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static int program_loaded = 0;
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static void dump_mem ();
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static void
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sim_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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if (sim_verbose)
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printf_filtered ("sim_fetch_register: %d\n", regno);
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/* FIXME: Where did the 16 come from and what does it need to be? */
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for (regno = 0; regno < 16; regno++)
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sim_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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simif_fetch_register (regno, buf);
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supply_register (regno, buf);
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if (sim_verbose)
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{
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printf_filtered ("sim_fetch_register: %d", regno);
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dump_mem (buf, sizeof (REGISTER_TYPE));
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}
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}
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}
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static void
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sim_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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if (sim_verbose)
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printf_filtered ("sim_store_register: %d\n", regno);
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/* FIXME: 16? */
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for (regno = 0; regno < 16; regno++)
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sim_store_register (regno);
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}
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else
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{
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char value[sizeof (REGISTER_TYPE)];
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read_register_gen (regno, value);
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SWAP_TARGET_AND_HOST (value, sizeof (REGISTER_TYPE));
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simif_store_register (regno, value);
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if (sim_verbose)
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{
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printf_filtered ("sim_store_register: %d", regno);
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dump_mem (value, sizeof (REGISTER_TYPE));
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}
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}
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}
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static void
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sim_kill (arg,from_tty)
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char *arg;
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int from_tty;
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{
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if (sim_verbose)
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printf_filtered ("sim_kill: arg \"%s\"\n", arg);
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simif_kill (); /* close fd's, remove mappings */
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inferior_pid = 0;
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}
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/* Load program PROG into the sim. */
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static void
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sim_load (prog, fromtty)
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char *prog;
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int fromtty;
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{
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bfd *abfd;
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if (sim_verbose)
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printf_filtered ("sim_load: prog \"%s\"\n", prog);
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inferior_pid = 0;
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program_loaded = 0;
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abfd = bfd_openr (prog, (char *) 0);
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if (!abfd)
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error ("Unable to open file %s.", prog);
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if (bfd_check_format (abfd, bfd_object) ==0)
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error ("File is not an object file.");
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if (simif_load (abfd, prog) != 0)
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return;
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program_loaded = 1;
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simif_set_pc (abfd->start_address);
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}
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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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sim_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,entry_pt;
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char *arg_buf,**argv;
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if (! program_loaded)
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error ("No program loaded.");
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if (sim_verbose)
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printf_filtered ("sim_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 = (int) bfd_get_start_address (exec_bfd);
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sim_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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simif_set_args (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, -1, 0);
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}
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/* Called when selecting the simulator. EG: (gdb) target sim name. */
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static void
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sim_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 (sim_verbose)
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printf_filtered ("sim_open: args \"%s\"\n", args);
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if (simif_open (args) != 0)
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{
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error ("Unable to initialize simulator (insufficient memory?).");
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return;
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}
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push_target (&sim_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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/* Close out all files and local state before this target loses control. */
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static void
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sim_close (quitting)
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int quitting;
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{
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if (sim_verbose)
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printf_filtered ("sim_close: quitting %d\n", quitting);
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program_loaded = 0;
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/* FIXME: Need to call simif_close() to close all files and
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delete all mappings. */
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}
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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
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with your gdb. */
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static void
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sim_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 (sim_verbose)
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printf_filtered ("sim_detach: args \"%s\"\n", args);
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pop_target (); /* calls sim_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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/* Tell the remote machine to resume. */
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/* FIXME: What are A and B? */
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static void
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sim_resume (a,b)
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{
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if (sim_verbose)
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printf_filtered ("sim_resume: %d/%d\n", a, b);
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simif_resume (a, b);
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}
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/* Wait until the remote machine stops, then return,
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storing status in STATUS just as `wait' would. */
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static int
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sim_wait (status)
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WAITTYPE *status;
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{
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if (sim_verbose)
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printf_filtered ("sim_wait: ");
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#if 1
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*status = simif_stop_signal ();
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#else
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WSETSTOP (*status, simif_stop_signal ());
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#endif
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if (sim_verbose)
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printf_filtered ("status %d\n", *status);
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return 0;
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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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sim_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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sim_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 (sim_verbose)
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{
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printf_filtered ("sim_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 (sim_verbose && write)
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dump_mem(myaddr, len);
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}
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if (! program_loaded)
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error ("No program loaded.");
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if (write)
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{
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len = simif_write (memaddr, myaddr, len);
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}
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else
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{
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len = simif_read (memaddr, myaddr, len);
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if (sim_verbose && 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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sim_files_info ()
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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 (sim_verbose)
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printf_filtered ("sim_files_info: file \"%s\"\n", file);
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if (exec_bfd)
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printf_filtered ("\tAttached to %s running program %s\n",
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target_shortname, file);
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}
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/* Clear the sims notion of what the break points are */
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static void
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sim_mourn ()
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{
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if (sim_verbose)
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printf_filtered ("sim_mourn:\n");
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remove_breakpoints ();
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generic_mourn_inferior ();
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}
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/* Define the target subroutine names */
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struct target_ops sim_ops =
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{
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"sim", "Simulator",
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"Use the Simulator",
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sim_open, sim_close,
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0, sim_detach, sim_resume, sim_wait, /* attach */
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sim_fetch_register, sim_store_register,
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sim_prepare_to_store,
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sim_xfer_inferior_memory,
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sim_files_info,
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0, 0, /* Breakpoints */
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0, 0, 0, 0, 0, /* Terminal handling */
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sim_kill, /* FIXME, kill */
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sim_load,
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0, /* lookup_symbol */
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sim_create_inferior, /* create_inferior */
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sim_mourn, /* mourn_inferior FIXME */
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0, /* can_run */
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0, /* notice_signals */
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process_stratum, 0, /* next */
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1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
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0, 0, /* Section pointers */
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OPS_MAGIC, /* Always the last thing */
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};
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static void
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sim_snoop ()
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{
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sim_verbose = ! sim_verbose;
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if (sim_verbose)
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printf_filtered ("Snoop enabled\n");
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else
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printf_filtered ("Snoop disabled\n");
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}
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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 (&sim_ops);
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add_com ("snoop", class_obscure, sim_snoop,
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"Show what commands are going to the simulator");
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}
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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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