282 lines
7.1 KiB
C
282 lines
7.1 KiB
C
/* Main simulator entry points specific to Lattice Mico32.
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Contributed by Jon Beniston <jon@beniston.com>
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Copyright (C) 2009-2015 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "sim-main.h"
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#include "sim-options.h"
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#include "libiberty.h"
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#include "bfd.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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static void free_state (SIM_DESC);
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static void print_lm32_misc_cpu (SIM_CPU * cpu, int verbose);
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static DECLARE_OPTION_HANDLER (lm32_option_handler);
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enum
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{
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OPTION_ENDIAN = OPTION_START,
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};
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/* GDB passes -E, even though it's fixed, so we have to handle it here. common code only handles it if SIM_HAVE_BIENDIAN is defined, which it isn't for lm32. */
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static const OPTION lm32_options[] = {
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{{"endian", required_argument, NULL, OPTION_ENDIAN},
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'E', "big", "Set endianness",
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lm32_option_handler},
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{{NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL}
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};
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/* Records simulator descriptor so utilities like lm32_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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/* Find memory range used by program. */
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static unsigned long
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find_base (bfd *prog_bfd)
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{
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int found;
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unsigned long base = ~(0UL);
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asection *s;
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found = 0;
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for (s = prog_bfd->sections; s; s = s->next)
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{
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if ((strcmp (bfd_get_section_name (prog_bfd, s), ".boot") == 0)
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|| (strcmp (bfd_get_section_name (prog_bfd, s), ".text") == 0)
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|| (strcmp (bfd_get_section_name (prog_bfd, s), ".data") == 0)
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|| (strcmp (bfd_get_section_name (prog_bfd, s), ".bss") == 0))
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{
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if (!found)
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{
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base = bfd_get_section_vma (prog_bfd, s);
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found = 1;
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}
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else
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base =
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bfd_get_section_vma (prog_bfd,
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s) < base ? bfd_get_section_vma (prog_bfd,
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s) : base;
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}
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}
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return base & ~(0xffffUL);
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}
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static unsigned long
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find_limit (bfd *prog_bfd)
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{
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struct bfd_symbol **asymbols;
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long symsize;
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long symbol_count;
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long s;
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symsize = bfd_get_symtab_upper_bound (prog_bfd);
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if (symsize < 0)
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return 0;
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asymbols = (asymbol **) xmalloc (symsize);
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symbol_count = bfd_canonicalize_symtab (prog_bfd, asymbols);
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if (symbol_count < 0)
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return 0;
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for (s = 0; s < symbol_count; s++)
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{
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if (!strcmp (asymbols[s]->name, "_fstack"))
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return (asymbols[s]->value + 65536) & ~(0xffffUL);
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}
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return 0;
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}
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/* Handle lm32 specific options. */
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static SIM_RC
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lm32_option_handler (sd, cpu, opt, arg, is_command)
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SIM_DESC sd;
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sim_cpu *cpu;
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int opt;
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char *arg;
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int is_command;
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{
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return SIM_RC_OK;
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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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SIM_DESC sd = sim_state_alloc (kind, callback);
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char c;
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int i;
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unsigned long base, limit;
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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 (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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sim_add_option_table (sd, NULL, lm32_options);
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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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#if 0
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/* Allocate a handler for I/O 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, LM32_DEVICE_ADDR, 1) == 0)
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sim_core_attach (sd, NULL, 0 /*level */ ,
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access_read_write, 0 /*space ??? */ ,
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LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
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0 /*modulo */ ,
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&lm32_devices, NULL /*buffer */ );
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#endif
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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), 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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/* Check to see if memory exists at programs start address. */
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if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
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== 0)
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{
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if (STATE_PROG_BFD (sd) != NULL)
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{
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/* It doesn't, so we should try to allocate enough memory to hold program. */
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base = find_base (STATE_PROG_BFD (sd));
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limit = find_limit (STATE_PROG_BFD (sd));
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if (limit == 0)
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{
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sim_io_eprintf (sd,
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"Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
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free_state (sd);
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return 0;
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}
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/*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
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sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
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}
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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 =
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lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
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CGEN_ENDIAN_BIG);
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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) = sim_cgen_disassemble_insn;
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}
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lm32_cgen_init_dis (cd);
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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 lm32_cgen_cpu_open. */
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cgen_init (sd);
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/* Store in a global so things like lm32_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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lm32_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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