Initial creation of sourceware repository
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Stan Shebs
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289
gdb/gdbserver/low-sim.c
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289
gdb/gdbserver/low-sim.c
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/* Low level interface to simulators, for the remote server for GDB.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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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 "bfd.h"
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#include "server.h"
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#include "callback.h" /* GDB simulator callback interface */
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#include "remote-sim.h" /* GDB simulator interface */
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extern int remote_debug;
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extern host_callback default_callback; /* in sim/common/callback.c */
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char registers[REGISTER_BYTES] __attribute__ ((aligned));
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int target_byte_order; /* used by simulator */
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/* We record the result of sim_open so we can pass it
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back to the other sim_foo routines. */
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static SIM_DESC gdbsim_desc = 0;
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/* This version of "load" should be usable for any simulator that
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does not support loading itself. */
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static void
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generic_load (loadfile_bfd)
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bfd *loadfile_bfd;
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{
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asection *s;
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for (s = loadfile_bfd->sections; s; s = s->next)
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{
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if (s->flags & SEC_LOAD)
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{
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bfd_size_type size;
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size = bfd_get_section_size_before_reloc (s);
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if (size > 0)
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{
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char *buffer;
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bfd_vma lma; /* use load address, not virtual address */
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buffer = xmalloc (size);
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lma = s->lma;
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/* Is this really necessary? I guess it gives the user something
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to look at during a long download. */
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printf ("Loading section %s, size 0x%lx lma 0x%lx\n",
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bfd_get_section_name (loadfile_bfd, s),
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(unsigned long) size,
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(unsigned long) lma); /* chops high 32 bits. FIXME!! */
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bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size);
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write_inferior_memory (lma, buffer, size);
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free (buffer);
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}
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}
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}
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printf ("Start address 0x%lx\n",
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(unsigned long)loadfile_bfd->start_address);
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/* We were doing this in remote-mips.c, I suspect it is right
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for other targets too. */
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/* write_pc (loadfile_bfd->start_address); */ /* FIXME!! */
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}
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int
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create_inferior (program, argv)
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char *program;
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char **argv;
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{
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bfd *abfd;
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int pid = 0;
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#ifdef TARGET_BYTE_ORDER_SELECTABLE
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char **new_argv;
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int nargs;
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#endif
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abfd = bfd_openr (program, 0);
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if (!abfd)
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{
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fprintf (stderr, "gdbserver: can't open %s: %s\n",
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program, bfd_errmsg (bfd_get_error ()));
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exit (1);
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}
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if (!bfd_check_format (abfd, bfd_object))
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{
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fprintf (stderr, "gdbserver: unknown load format for %s: %s\n",
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program, bfd_errmsg (bfd_get_error ()));
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exit (1);
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}
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#ifdef TARGET_BYTE_ORDER_SELECTABLE
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/* Add "-E big" or "-E little" to the argument list depending on the
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endianness of the program to be loaded. */
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for (nargs = 0; argv[nargs] != NULL; nargs++) /* count the args */
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;
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new_argv = alloca (sizeof (char *) * (nargs + 3)); /* allocate new args */
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for (nargs = 0; argv[nargs] != NULL; nargs++) /* copy old to new */
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new_argv[nargs] = argv[nargs];
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new_argv[nargs] = "-E";
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new_argv[nargs + 1] = bfd_big_endian (abfd) ? "big" : "little";
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new_argv[nargs + 2] = NULL;
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argv = new_argv;
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#endif
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/* Create an instance of the simulator. */
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default_callback.init (&default_callback);
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gdbsim_desc = sim_open (SIM_OPEN_STANDALONE, &default_callback, abfd, argv);
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if (gdbsim_desc == 0)
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exit (1);
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/* Load the program into the simulator. */
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if (abfd)
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if (sim_load (gdbsim_desc, program, NULL, 0) == SIM_RC_FAIL)
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generic_load (abfd);
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/* Create an inferior process in the simulator. This initializes SP. */
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sim_create_inferior (gdbsim_desc, abfd, argv, /* env */ NULL);
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sim_resume (gdbsim_desc, 1, 0); /* execute one instr */
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return pid;
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}
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/* Kill the inferior process. Make us have no inferior. */
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void
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kill_inferior ()
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{
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sim_close (gdbsim_desc, 0);
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default_callback.shutdown (&default_callback);
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}
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/* Fetch one register. */
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static void
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fetch_register (regno)
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int regno;
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{
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sim_fetch_register (gdbsim_desc, regno, ®isters[REGISTER_BYTE (regno)],
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REGISTER_RAW_SIZE (regno));
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}
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/* Fetch all registers, or just one, from the child process. */
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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if (regno == -1 || regno == 0)
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for (regno = 0; regno < NUM_REGS/*-NUM_FREGS*/; regno++)
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fetch_register (regno);
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else
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fetch_register (regno);
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}
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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void
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store_inferior_registers (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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store_inferior_registers (regno);
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}
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else
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sim_store_register (gdbsim_desc, regno, ®isters[REGISTER_BYTE (regno)],
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REGISTER_RAW_SIZE (regno));
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}
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/* Return nonzero if the given thread is still alive. */
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int
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mythread_alive (pid)
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int pid;
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{
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return 1;
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}
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/* Wait for process, returns status */
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unsigned char
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mywait (status)
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char *status;
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{
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int sigrc;
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enum sim_stop reason;
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sim_stop_reason (gdbsim_desc, &reason, &sigrc);
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switch (reason)
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{
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case sim_exited:
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if (remote_debug)
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printf ("\nChild exited with retcode = %x \n", sigrc);
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*status = 'W';
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return sigrc;
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#if 0
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case sim_stopped:
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if (remote_debug)
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printf ("\nChild terminated with signal = %x \n", sigrc);
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*status = 'X';
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return sigrc;
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#endif
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default: /* should this be sim_signalled or sim_stopped? FIXME!! */
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if (remote_debug)
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printf ("\nChild received signal = %x \n", sigrc);
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fetch_inferior_registers (0);
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*status = 'T';
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return (unsigned char) sigrc;
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}
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}
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/* Resume execution of the inferior process.
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If STEP is nonzero, single-step it.
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If SIGNAL is nonzero, give it that signal. */
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void
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myresume (step, signo)
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int step;
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int signo;
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{
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/* Should be using target_signal_to_host() or signal numbers in target.h
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to convert GDB signal number to target signal number. */
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sim_resume (gdbsim_desc, step, signo);
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}
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/* Copy LEN bytes from inferior's memory starting at MEMADDR
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to debugger memory starting at MYADDR. */
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void
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read_inferior_memory (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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{
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sim_read (gdbsim_desc, memaddr, myaddr, len);
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}
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/* Copy LEN bytes of data from debugger memory at MYADDR
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to inferior's memory at MEMADDR.
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On failure (cannot write the inferior)
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returns the value of errno. */
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int
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write_inferior_memory (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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{
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sim_write (gdbsim_desc, memaddr, myaddr, len); /* should check for error. FIXME!! */
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return 0;
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}
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#if 0
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void
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initialize ()
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{
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inferior_pid = 0;
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}
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int
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have_inferior_p ()
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{
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return inferior_pid != 0;
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}
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#endif
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