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/* Main simulator entry points specific to Lattice Mico32.
Contributed by Jon Beniston <jon@beniston.com>
Copyright (C) 2009-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "sim-main.h"
#include "sim-options.h"
#include "libiberty.h"
#include "bfd.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
/* Cover function of sim_state_free to free the cpu buffers as well. */
static void
free_state (SIM_DESC sd)
{
if (STATE_MODULES (sd) != NULL)
sim_module_uninstall (sd);
sim_cpu_free_all (sd);
sim_state_free (sd);
}
/* Find memory range used by program. */
static unsigned long
find_base (bfd *prog_bfd)
{
int found;
unsigned long base = ~(0UL);
asection *s;
found = 0;
for (s = prog_bfd->sections; s; s = s->next)
{
if ((strcmp (bfd_section_name (s), ".boot") == 0)
|| (strcmp (bfd_section_name (s), ".text") == 0)
|| (strcmp (bfd_section_name (s), ".data") == 0)
|| (strcmp (bfd_section_name (s), ".bss") == 0))
{
if (!found)
{
base = bfd_section_vma (s);
found = 1;
}
else
base = bfd_section_vma (s) < base ? bfd_section_vma (s) : base;
}
}
return base & ~(0xffffUL);
}
static unsigned long
find_limit (SIM_DESC sd)
{
bfd_vma addr;
addr = trace_sym_value (sd, "_fstack");
if (addr == -1)
return 0;
return (addr + 65536) & ~(0xffffUL);
}
/* Create an instance of the simulator. */
SIM_DESC
sim_open (kind, callback, abfd, argv)
SIM_OPEN_KIND kind;
host_callback *callback;
struct bfd *abfd;
char * const *argv;
{
SIM_DESC sd = sim_state_alloc (kind, callback);
char c;
int i;
unsigned long base, limit;
/* The cpu data is kept in a separately allocated chunk of memory. */
if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* The parser will print an error message for us, so we silently return. */
if (sim_parse_args (sd, argv) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
#if 0
/* Allocate a handler for I/O devices
if no memory for that range has been allocated by the user.
All are allocated in one chunk to keep things from being
unnecessarily complicated. */
if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
sim_core_attach (sd, NULL, 0 /*level */ ,
access_read_write, 0 /*space ??? */ ,
LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
0 /*modulo */ ,
&lm32_devices, NULL /*buffer */ );
#endif
/* check for/establish the reference program image. */
if (sim_analyze_program (sd,
(STATE_PROG_ARGV (sd) != NULL
? *STATE_PROG_ARGV (sd)
: NULL), abfd) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* Check to see if memory exists at programs start address. */
if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
== 0)
{
if (STATE_PROG_BFD (sd) != NULL)
{
/* It doesn't, so we should try to allocate enough memory to hold program. */
base = find_base (STATE_PROG_BFD (sd));
limit = find_limit (sd);
if (limit == 0)
{
sim_io_eprintf (sd,
"Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
free_state (sd);
return 0;
}
/*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
}
}
/* Establish any remaining configuration options. */
if (sim_config (sd) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
if (sim_post_argv_init (sd) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* Open a copy of the cpu descriptor table. */
{
CGEN_CPU_DESC cd =
lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
CGEN_ENDIAN_BIG);
for (i = 0; i < MAX_NR_PROCESSORS; ++i)
{
SIM_CPU *cpu = STATE_CPU (sd, i);
CPU_CPU_DESC (cpu) = cd;
CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
}
lm32_cgen_init_dis (cd);
}
/* Initialize various cgen things not done by common framework.
Must be done after lm32_cgen_cpu_open. */
cgen_init (sd);
return sd;
}
SIM_RC
sim_create_inferior (sd, abfd, argv, envp)
SIM_DESC sd;
struct bfd *abfd;
char * const *argv;
char * const *envp;
{
SIM_CPU *current_cpu = STATE_CPU (sd, 0);
SIM_ADDR addr;
if (abfd != NULL)
addr = bfd_get_start_address (abfd);
else
addr = 0;
sim_pc_set (current_cpu, addr);
/* Standalone mode (i.e. `run`) will take care of the argv for us in
sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim'
with `gdb`), we need to handle it because the user can change the
argv on the fly via gdb's 'run'. */
if (STATE_PROG_ARGV (sd) != argv)
{
freeargv (STATE_PROG_ARGV (sd));
STATE_PROG_ARGV (sd) = dupargv (argv);
}
return SIM_RC_OK;
}
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