454 lines
10 KiB
C
454 lines
10 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1996,1998, Andrew Cagney <cagney@highland.com.au>
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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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*/
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#include <signal.h> /* FIXME - should be machine dependant version */
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#include <stdarg.h>
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#include <ctype.h>
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#include "psim.h"
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#include "options.h"
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#undef printf_filtered /* blow away the mapping */
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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#include "defs.h"
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#include "bfd.h"
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#include "callback.h"
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#include "remote-sim.h"
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/* Define the rate at which the simulator should poll the host
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for a quit. */
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#ifndef POLL_QUIT_INTERVAL
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#define POLL_QUIT_INTERVAL 0x20
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#endif
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static int poll_quit_count = POLL_QUIT_INTERVAL;
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/* Structures used by the simulator, for gdb just have static structures */
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static psim *simulator;
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static device *root_device;
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static host_callback *callbacks;
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/* We use GDB's reg_names array to map GDB register numbers onto
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names, which we can then look up in the register table.
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We used to just use the REGISTER_NAMES macro, from GDB's
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target-dependent header files. That was kind of nice, because it
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meant that libsim.a had only a compile-time dependency on GDB;
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using reg_names directly means that there are now link-time and
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run-time dependencies too.
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However, the GDB PPC back-end now modifies the reg_names array when
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the user runs the `set processor' command, which affects the
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meanings of the register numbers. So the sim needs to see the
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register names GDB is actually using.
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Perhaps the host_callback structure could contain a pointer to the
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register name table; that would be cleaner. */
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SIM_DESC
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sim_open (SIM_OPEN_KIND kind,
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host_callback *callback,
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struct _bfd *abfd,
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char **argv)
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{
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callbacks = callback;
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/* Note: The simulation is not created by sim_open() because
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complete information is not yet available */
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/* trace the call */
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TRACE(trace_gdb, ("sim_open called\n"));
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if (root_device != NULL)
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sim_io_printf_filtered("Warning - re-open of simulator leaks memory\n");
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root_device = psim_tree();
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simulator = NULL;
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psim_options(root_device, argv + 1);
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if (ppc_trace[trace_opts])
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print_options ();
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/* fudge our descriptor for now */
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return (SIM_DESC) 1;
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}
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void
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sim_close (SIM_DESC sd, int quitting)
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{
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TRACE(trace_gdb, ("sim_close(quitting=%d) called\n", quitting));
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if (ppc_trace[trace_print_info] && simulator != NULL)
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psim_print_info (simulator, ppc_trace[trace_print_info]);
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}
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SIM_RC
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sim_load (SIM_DESC sd, char *prog, bfd *abfd, int from_tty)
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{
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TRACE(trace_gdb, ("sim_load(prog=%s, from_tty=%d) called\n",
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prog, from_tty));
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ASSERT(prog != NULL);
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/* create the simulator */
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TRACE(trace_gdb, ("sim_load() - first time, create the simulator\n"));
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simulator = psim_create(prog, root_device);
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/* bring in all the data section */
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psim_init(simulator);
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/* get the start address */
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if (abfd == NULL)
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{
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abfd = bfd_openr (prog, 0);
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if (abfd == NULL)
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error ("psim: can't open \"%s\": %s\n",
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prog, bfd_errmsg (bfd_get_error ()));
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if (!bfd_check_format (abfd, bfd_object))
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{
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const char *errmsg = bfd_errmsg (bfd_get_error ());
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bfd_close (abfd);
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error ("psim: \"%s\" is not an object file: %s\n",
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prog, errmsg);
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}
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bfd_close (abfd);
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}
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return SIM_RC_OK;
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}
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int
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sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
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{
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int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
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buf, mem, length);
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TRACE(trace_gdb, ("sim_read(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
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(long)mem, (long)buf, length, result));
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return result;
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}
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int
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sim_write (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length)
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{
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int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
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buf, mem, length,
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1/*violate_ro*/);
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TRACE(trace_gdb, ("sim_write(mem=0x%lx, buf=0x%lx, length=%d) = %d\n",
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(long)mem, (long)buf, length, result));
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return result;
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}
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int
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sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
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{
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char *regname;
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if (simulator == NULL) {
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return 0;
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}
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/* GDB will sometimes ask for the contents of a register named "";
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we ignore such requests, and leave garbage in *BUF. In
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REG_NAMES, the empty string means "the register with this
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number is not present in the currently selected architecture
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variant." That's following the kludge we're using for the MIPS
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processors. But there are loops that just walk through the
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entire list of names and try to get everything. */
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regname = REGISTER_NAME (regno);
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if (! regname || regname[0] == '\0')
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return -1;
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TRACE(trace_gdb, ("sim_fetch_register(regno=%d(%s), buf=0x%lx)\n",
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regno, regname, (long)buf));
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psim_read_register(simulator, MAX_NR_PROCESSORS,
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buf, regname, raw_transfer);
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return -1;
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}
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int
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sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length)
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{
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char *regname;
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if (simulator == NULL)
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return 0;
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/* See comments in sim_fetch_register, above. */
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regname = REGISTER_NAME (regno);
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if (! regname || regname[0] == '\0')
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return -1;
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TRACE(trace_gdb, ("sim_store_register(regno=%d(%s), buf=0x%lx)\n",
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regno, regname, (long)buf));
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psim_write_register(simulator, MAX_NR_PROCESSORS,
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buf, regname, raw_transfer);
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return -1;
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}
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void
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sim_info (SIM_DESC sd, int verbose)
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{
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TRACE(trace_gdb, ("sim_info(verbose=%d) called\n", verbose));
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psim_print_info (simulator, verbose);
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}
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SIM_RC
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sim_create_inferior (SIM_DESC sd,
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struct _bfd *abfd,
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char **argv,
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char **envp)
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{
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unsigned_word entry_point;
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TRACE(trace_gdb, ("sim_create_inferior(start_address=0x%x, ...)\n",
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entry_point));
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if (simulator == NULL)
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error ("No program loaded");
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if (abfd != NULL)
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entry_point = bfd_get_start_address (abfd);
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else
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entry_point = 0xfff00000; /* ??? */
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psim_init(simulator);
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psim_stack(simulator, argv, envp);
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psim_write_register(simulator, -1 /* all start at same PC */,
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&entry_point, "pc", cooked_transfer);
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return SIM_RC_OK;
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}
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void
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sim_stop_reason (SIM_DESC sd, enum sim_stop *reason, int *sigrc)
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{
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psim_status status = psim_get_status(simulator);
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switch (status.reason) {
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case was_continuing:
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*reason = sim_stopped;
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if (status.signal == 0)
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*sigrc = SIGTRAP;
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else
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*sigrc = status.signal;
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break;
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case was_trap:
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*reason = sim_stopped;
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*sigrc = SIGTRAP;
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break;
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case was_exited:
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*reason = sim_exited;
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*sigrc = status.signal;
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break;
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case was_signalled:
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*reason = sim_signalled;
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*sigrc = status.signal;
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break;
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}
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TRACE(trace_gdb, ("sim_stop_reason(reason=0x%lx(%ld), sigrc=0x%lx(%ld))\n",
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(long)reason, (long)*reason, (long)sigrc, (long)*sigrc));
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}
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/* Run (or resume) the program. */
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int
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sim_stop (SIM_DESC sd)
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{
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psim_stop (simulator);
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return 1;
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}
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void
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sim_resume (SIM_DESC sd, int step, int siggnal)
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{
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TRACE(trace_gdb, ("sim_resume(step=%d, siggnal=%d)\n",
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step, siggnal));
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if (step)
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{
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psim_step (simulator);
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}
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else
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{
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psim_run (simulator);
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}
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}
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void
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sim_do_command (SIM_DESC sd, char *cmd)
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{
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TRACE(trace_gdb, ("sim_do_commands(cmd=%s) called\n",
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cmd ? cmd : "(null)"));
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if (cmd != NULL) {
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char **argv = buildargv(cmd);
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psim_command(root_device, argv);
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freeargv(argv);
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}
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}
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/* Polling, if required */
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void
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sim_io_poll_quit (void)
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{
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if (callbacks->poll_quit != NULL && poll_quit_count-- < 0)
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{
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poll_quit_count = POLL_QUIT_INTERVAL;
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if (callbacks->poll_quit (callbacks))
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psim_stop (simulator);
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}
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}
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/* Map simulator IO operations onto the corresponding GDB I/O
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functions.
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NB: Only a limited subset of operations are mapped across. More
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advanced operations (such as dup or write) must either be mapped to
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one of the below calls or handled internally */
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int
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sim_io_read_stdin(char *buf,
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int sizeof_buf)
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{
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switch (CURRENT_STDIO) {
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case DO_USE_STDIO:
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return callbacks->read_stdin(callbacks, buf, sizeof_buf);
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break;
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case DONT_USE_STDIO:
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return callbacks->read(callbacks, 0, buf, sizeof_buf);
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break;
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default:
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error("sim_io_read_stdin: unaccounted switch\n");
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break;
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}
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return 0;
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}
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int
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sim_io_write_stdout(const char *buf,
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int sizeof_buf)
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{
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switch (CURRENT_STDIO) {
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case DO_USE_STDIO:
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return callbacks->write_stdout(callbacks, buf, sizeof_buf);
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break;
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case DONT_USE_STDIO:
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return callbacks->write(callbacks, 1, buf, sizeof_buf);
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break;
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default:
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error("sim_io_write_stdout: unaccounted switch\n");
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break;
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}
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return 0;
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}
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int
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sim_io_write_stderr(const char *buf,
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int sizeof_buf)
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{
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switch (CURRENT_STDIO) {
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case DO_USE_STDIO:
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/* NB: I think there should be an explicit write_stderr callback */
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return callbacks->write(callbacks, 3, buf, sizeof_buf);
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break;
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case DONT_USE_STDIO:
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return callbacks->write(callbacks, 3, buf, sizeof_buf);
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break;
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default:
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error("sim_io_write_stderr: unaccounted switch\n");
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break;
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}
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return 0;
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}
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void
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sim_io_printf_filtered(const char *fmt,
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...)
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{
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char message[1024];
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va_list ap;
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/* format the message */
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va_start(ap, fmt);
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vsprintf(message, fmt, ap);
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va_end(ap);
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/* sanity check */
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if (strlen(message) >= sizeof(message))
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error("sim_io_printf_filtered: buffer overflow\n");
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callbacks->printf_filtered(callbacks, "%s", message);
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}
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void
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sim_io_flush_stdoutput(void)
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{
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switch (CURRENT_STDIO) {
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case DO_USE_STDIO:
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callbacks->flush_stdout (callbacks);
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break;
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case DONT_USE_STDIO:
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break;
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default:
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error("sim_io_read_stdin: unaccounted switch\n");
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break;
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}
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}
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/****/
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void *
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zalloc(long size)
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{
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void *memory = (void*)xmalloc(size);
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if (memory == NULL)
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error("xmalloc failed\n");
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memset(memory, 0, size);
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return memory;
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}
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void zfree(void *data)
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{
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free(data);
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}
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