312 lines
7.7 KiB
C
312 lines
7.7 KiB
C
/* Main simulator entry points for the i960.
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Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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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, or (at your option)
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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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "libiberty.h"
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#include "bfd.h"
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#include "sim-main.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include "sim-options.h"
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#include "dis-asm.h"
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static void free_state (SIM_DESC);
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/* Since we don't build the cgen-opcode table, we use the old
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disassembler. */
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static CGEN_DISASSEMBLER i960_disassemble_insn;
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/* Records simulator descriptor so utilities like i960_dump_regs can be
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called from gdb. */
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SIM_DESC current_state;
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/* Cover function of sim_state_free to free the cpu buffers as well. */
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static void
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free_state (SIM_DESC sd)
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{
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if (STATE_MODULES (sd) != NULL)
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sim_module_uninstall (sd);
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sim_cpu_free_all (sd);
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sim_state_free (sd);
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}
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/* Create an instance of the simulator. */
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SIM_DESC
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sim_open (kind, callback, abfd, argv)
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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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char c;
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int i;
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SIM_DESC sd = sim_state_alloc (kind, callback);
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/* The cpu data is kept in a separately allocated chunk of memory. */
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if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
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{
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free_state (sd);
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return 0;
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}
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#if 0 /* FIXME: pc is in mach-specific struct */
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/* FIXME: watchpoints code shouldn't need this */
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{
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SIM_CPU *current_cpu = STATE_CPU (sd, 0);
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STATE_WATCHPOINTS (sd)->pc = &(PC);
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STATE_WATCHPOINTS (sd)->sizeof_pc = sizeof (PC);
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}
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#endif
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if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
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{
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free_state (sd);
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return 0;
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}
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#if 0 /* FIXME: 'twould be nice if we could do this */
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/* These options override any module options.
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Obviously ambiguity should be avoided, however the caller may wish to
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augment the meaning of an option. */
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if (extra_options != NULL)
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sim_add_option_table (sd, extra_options);
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#endif
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/* getopt will print the error message so we just have to exit if this fails.
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FIXME: Hmmm... in the case of gdb we need getopt to call
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print_filtered. */
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if (sim_parse_args (sd, argv) != SIM_RC_OK)
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{
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free_state (sd);
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return 0;
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}
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/* Allocate a handler for the control registers and other devices
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if no memory for that range has been allocated by the user.
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All are allocated in one chunk to keep things from being
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unnecessarily complicated. */
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if (sim_core_read_buffer (sd, NULL, read_map, &c, I960_DEVICE_ADDR, 1) == 0)
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sim_core_attach (sd, NULL,
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0 /*level*/,
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access_read_write,
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0 /*space ???*/,
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I960_DEVICE_ADDR, I960_DEVICE_LEN /*nr_bytes*/,
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0 /*modulo*/,
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&i960_devices,
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NULL /*buffer*/);
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/* Allocate core managed memory if none specified by user.
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Use address 4 here in case the user wanted address 0 unmapped. */
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if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0)
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/* ??? wilson */
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sim_do_commandf (sd, "memory region 0x%lx,0x%lx", I960_DEFAULT_MEM_START,
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I960_DEFAULT_MEM_SIZE);
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/* check for/establish the reference program image */
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if (sim_analyze_program (sd,
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(STATE_PROG_ARGV (sd) != NULL
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? *STATE_PROG_ARGV (sd)
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: NULL),
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abfd) != SIM_RC_OK)
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{
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free_state (sd);
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return 0;
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}
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/* Establish any remaining configuration options. */
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if (sim_config (sd) != SIM_RC_OK)
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{
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free_state (sd);
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return 0;
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}
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if (sim_post_argv_init (sd) != SIM_RC_OK)
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{
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free_state (sd);
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return 0;
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}
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/* Open a copy of the cpu descriptor table. */
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{
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CGEN_CPU_DESC cd = i960_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
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CGEN_ENDIAN_LITTLE);
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for (i = 0; i < MAX_NR_PROCESSORS; ++i)
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{
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SIM_CPU *cpu = STATE_CPU (sd, i);
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CPU_CPU_DESC (cpu) = cd;
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CPU_DISASSEMBLER (cpu) = i960_disassemble_insn;
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}
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}
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/* Initialize various cgen things not done by common framework.
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Must be done after i960_cgen_cpu_open. */
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cgen_init (sd);
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/* Store in a global so things like i960_dump_regs can be invoked
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from the gdb command line. */
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current_state = sd;
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return sd;
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}
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void
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sim_close (sd, quitting)
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SIM_DESC sd;
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int quitting;
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{
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i960_cgen_cpu_close (CPU_CPU_DESC (STATE_CPU (sd, 0)));
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sim_module_uninstall (sd);
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}
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SIM_RC
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sim_create_inferior (sd, abfd, argv, envp)
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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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SIM_CPU *current_cpu = STATE_CPU (sd, 0);
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SIM_ADDR addr;
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if (abfd != NULL)
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addr = bfd_get_start_address (abfd);
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else
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addr = 0;
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sim_pc_set (current_cpu, addr);
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#if 0
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STATE_ARGV (sd) = sim_copy_argv (argv);
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STATE_ENVP (sd) = sim_copy_argv (envp);
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#endif
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return SIM_RC_OK;
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}
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#if 0
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int
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sim_stop (SIM_DESC sd)
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{
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switch (STATE_ARCHITECTURE (sd)->mach)
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{
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case bfd_mach_i960_ka_sa :
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return i960base_engine_stop (sd, NULL, NULL_CIA, sim_stopped, SIM_SIGINT);
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default :
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abort ();
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}
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}
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/* This isn't part of the official interface.
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This is just a good place to put this for now. */
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void
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sim_sync_stop (SIM_DESC sd, SIM_CPU *cpu, PCADDR pc, enum sim_stop reason, int sigrc)
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{
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switch (STATE_ARCHITECTURE (sd)->mach)
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{
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case bfd_mach_i960_ka_sa :
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(void) i960base_engine_stop (sd, cpu, pc, reason, sigrc);
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break;
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default :
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abort ();
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}
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}
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void
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sim_resume (sd, step, siggnal)
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SIM_DESC sd;
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int step, siggnal;
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{
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sim_module_resume (sd);
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switch (STATE_ARCHITECTURE (sd)->mach)
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{
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case bfd_mach_i960_ka_sa :
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i960base_engine_run (sd, step, siggnal);
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break;
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default :
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abort ();
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}
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sim_module_suspend (sd);
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}
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#endif
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/* The contents of BUF are in target byte order. */
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int
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sim_fetch_register (sd, rn, buf, length)
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SIM_DESC sd;
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int rn;
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unsigned char *buf;
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int length;
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{
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SIM_CPU *cpu = STATE_CPU (sd, 0);
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return (* CPU_REG_FETCH (cpu)) (cpu, rn, buf, length);
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}
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/* The contents of BUF are in target byte order. */
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int
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sim_store_register (sd, rn, buf, length)
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SIM_DESC sd;
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int rn;
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unsigned char *buf;
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int length;
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{
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SIM_CPU *cpu = STATE_CPU (sd, 0);
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return (* CPU_REG_STORE (cpu)) (cpu, rn, buf, length);
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}
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void
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sim_do_command (sd, cmd)
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SIM_DESC sd;
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char *cmd;
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{
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if (sim_args_command (sd, cmd) != SIM_RC_OK)
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sim_io_eprintf (sd, "Unknown command `%s'\n", cmd);
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}
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/* Disassemble an instruction. */
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static void
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i960_disassemble_insn (SIM_CPU *cpu, const CGEN_INSN *insn,
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const ARGBUF *abuf, IADDR pc, char *buf)
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{
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struct disassemble_info disasm_info;
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SFILE sfile;
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SIM_DESC sd = CPU_STATE (cpu);
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int insn_length = CGEN_INSN_BITSIZE (insn) / 8;
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sfile.buffer = sfile.current = buf;
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INIT_DISASSEMBLE_INFO (disasm_info, (FILE *) &sfile,
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(fprintf_ftype) sim_disasm_sprintf);
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disasm_info.endian =
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(bfd_big_endian (STATE_PROG_BFD (sd)) ? BFD_ENDIAN_BIG
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: bfd_little_endian (STATE_PROG_BFD (sd)) ? BFD_ENDIAN_LITTLE
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: BFD_ENDIAN_UNKNOWN);
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disasm_info.read_memory_func = sim_disasm_read_memory;
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disasm_info.memory_error_func = sim_disasm_perror_memory;
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disasm_info.application_data = (PTR) cpu;
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print_insn_i960 (pc, &disasm_info);
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}
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