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binutils-gdb/sim/common/sim-watch.c
Joel Brobecker 4a94e36819 Automatic Copyright Year update after running gdb/copyright.py 
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2022-01-01 19:13:23 +04:00

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/* Generic simulator watchpoint support.
Copyright (C) 1997-2022 Free Software Foundation, Inc.
Contributed by Cygnus Support.
This file is part of GDB, the GNU debugger.
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/>. */
/* This must come before any other includes. */
#include "defs.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libiberty.h"
#include "sim-main.h"
#include "sim-options.h"
#include "sim-signal.h"
#include "sim-assert.h"
enum {
OPTION_WATCH_DELETE = OPTION_START,
OPTION_WATCH_INFO,
OPTION_WATCH_CLOCK,
OPTION_WATCH_CYCLES,
OPTION_WATCH_PC,
OPTION_WATCH_OP,
};
/* Break an option number into its op/int-nr */
static watchpoint_type
option_to_type (SIM_DESC sd,
int option)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
watchpoint_type type = ((option - OPTION_WATCH_OP)
/ (watch->nr_interrupts + 1));
SIM_ASSERT (type >= 0 && type < nr_watchpoint_types);
return type;
}
static int
option_to_interrupt_nr (SIM_DESC sd,
int option)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
int interrupt_nr = ((option - OPTION_WATCH_OP)
% (watch->nr_interrupts + 1));
return interrupt_nr;
}
static int
type_to_option (SIM_DESC sd,
watchpoint_type type,
int interrupt_nr)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
return ((type * (watch->nr_interrupts + 1))
+ interrupt_nr
+ OPTION_WATCH_OP);
}
/* Delete one or more watchpoints. Fail if no watchpoints were found */
static SIM_RC
do_watchpoint_delete (SIM_DESC sd,
int ident,
watchpoint_type type)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
sim_watch_point **entry = &watch->points;
SIM_RC status = SIM_RC_FAIL;
while ((*entry) != NULL)
{
if ((*entry)->ident == ident
|| (*entry)->type == type)
{
sim_watch_point *dead = (*entry);
(*entry) = (*entry)->next;
sim_events_deschedule (sd, dead->event);
free (dead);
status = SIM_RC_OK;
}
else
entry = &(*entry)->next;
}
return status;
}
static const char *
watchpoint_type_to_str (SIM_DESC sd,
watchpoint_type type)
{
switch (type)
{
case pc_watchpoint:
return "pc";
case clock_watchpoint:
return "clock";
case cycles_watchpoint:
return "cycles";
case invalid_watchpoint:
case nr_watchpoint_types:
return "(invalid-type)";
}
return NULL;
}
static const char *
interrupt_nr_to_str (SIM_DESC sd,
int interrupt_nr)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
if (interrupt_nr < 0)
return "(invalid-interrupt)";
else if (interrupt_nr >= watch->nr_interrupts)
return "breakpoint";
else
return watch->interrupt_names[interrupt_nr];
}
static void
do_watchpoint_info (SIM_DESC sd)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
sim_watch_point *point;
sim_io_printf (sd, "Watchpoints:\n");
for (point = watch->points; point != NULL; point = point->next)
{
sim_io_printf (sd, "%3d: watch %s %s ",
point->ident,
watchpoint_type_to_str (sd, point->type),
interrupt_nr_to_str (sd, point->interrupt_nr));
if (point->is_periodic)
sim_io_printf (sd, "+");
if (!point->is_within)
sim_io_printf (sd, "!");
sim_io_printf (sd, "0x%lx", point->arg0);
if (point->arg1 != point->arg0)
sim_io_printf (sd, ",0x%lx", point->arg1);
sim_io_printf (sd, "\n");
}
}
static sim_event_handler handle_watchpoint;
static SIM_RC
schedule_watchpoint (SIM_DESC sd,
sim_watch_point *point)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
switch (point->type)
{
case pc_watchpoint:
point->event = sim_events_watch_pc (sd,
point->is_within,
point->arg0, point->arg1,
/* PC in arg0..arg1 */
handle_watchpoint,
point);
return SIM_RC_OK;
case clock_watchpoint:
point->event = sim_events_watch_clock (sd,
point->arg0, /* ms time */
handle_watchpoint,
point);
return SIM_RC_OK;
case cycles_watchpoint:
point->event = sim_events_schedule (sd,
point->arg0, /* time */
handle_watchpoint,
point);
return SIM_RC_OK;
default:
sim_engine_abort (sd, NULL, NULL_CIA,
"handle_watchpoint - internal error - bad switch");
return SIM_RC_FAIL;
}
return SIM_RC_OK;
}
static void
handle_watchpoint (SIM_DESC sd, void *data)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
sim_watch_point *point = (sim_watch_point *) data;
int interrupt_nr = point->interrupt_nr;
if (point->is_periodic)
/* reschedule this event before processing it */
schedule_watchpoint (sd, point);
else
do_watchpoint_delete (sd, point->ident, invalid_watchpoint);
if (point->interrupt_nr == watch->nr_interrupts)
sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGINT);
else
watch->interrupt_handler (sd, &watch->interrupt_names[interrupt_nr]);
}
static SIM_RC
do_watchpoint_create (SIM_DESC sd,
watchpoint_type type,
int opt,
char *arg)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
sim_watch_point **point;
/* create the watchpoint */
point = &watch->points;
while ((*point) != NULL)
point = &(*point)->next;
(*point) = ZALLOC (sim_watch_point);
/* fill in the details */
(*point)->ident = ++(watch->last_point_nr);
(*point)->type = option_to_type (sd, opt);
(*point)->interrupt_nr = option_to_interrupt_nr (sd, opt);
/* prefixes to arg - +== periodic, !==not or outside */
(*point)->is_within = 1;
while (1)
{
if (arg[0] == '+')
(*point)->is_periodic = 1;
else if (arg[0] == '!')
(*point)->is_within = 0;
else
break;
arg++;
}
(*point)->arg0 = strtoul (arg, &arg, 0);
if (arg[0] == ',')
(*point)->arg1 = strtoul (arg + 1, NULL, 0);
else
(*point)->arg1 = (*point)->arg0;
/* schedule it */
schedule_watchpoint (sd, (*point));
return SIM_RC_OK;
}
static SIM_RC
watchpoint_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
char *arg, int is_command)
{
if (opt >= OPTION_WATCH_OP)
return do_watchpoint_create (sd, clock_watchpoint, opt, arg);
else
switch (opt)
{
case OPTION_WATCH_DELETE:
if (isdigit ((int) arg[0]))
{
int ident = strtol (arg, NULL, 0);
if (do_watchpoint_delete (sd, ident, invalid_watchpoint)
!= SIM_RC_OK)
{
sim_io_eprintf (sd, "Watchpoint %d not found\n", ident);
return SIM_RC_FAIL;
}
return SIM_RC_OK;
}
else if (strcasecmp (arg, "all") == 0)
{
watchpoint_type type;
for (type = invalid_watchpoint + 1;
type < nr_watchpoint_types;
type++)
{
do_watchpoint_delete (sd, 0, type);
}
return SIM_RC_OK;
}
else if (strcasecmp (arg, "pc") == 0)
{
if (do_watchpoint_delete (sd, 0, pc_watchpoint)
!= SIM_RC_OK)
{
sim_io_eprintf (sd, "No PC watchpoints found\n");
return SIM_RC_FAIL;
}
return SIM_RC_OK;
}
else if (strcasecmp (arg, "clock") == 0)
{
if (do_watchpoint_delete (sd, 0, clock_watchpoint) != SIM_RC_OK)
{
sim_io_eprintf (sd, "No CLOCK watchpoints found\n");
return SIM_RC_FAIL;
}
return SIM_RC_OK;
}
else if (strcasecmp (arg, "cycles") == 0)
{
if (do_watchpoint_delete (sd, 0, cycles_watchpoint) != SIM_RC_OK)
{
sim_io_eprintf (sd, "No CYCLES watchpoints found\n");
return SIM_RC_FAIL;
}
return SIM_RC_OK;
}
sim_io_eprintf (sd, "Unknown watchpoint type `%s'\n", arg);
return SIM_RC_FAIL;
case OPTION_WATCH_INFO:
{
do_watchpoint_info (sd);
return SIM_RC_OK;
}
default:
sim_io_eprintf (sd, "Unknown watch option %d\n", opt);
return SIM_RC_FAIL;
}
}
static SIM_RC
sim_watchpoint_init (SIM_DESC sd)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
sim_watch_point *point;
/* NOTE: Do not need to de-schedule any previous watchpoints as
sim-events has already done this */
/* schedule any watchpoints enabled by command line options */
for (point = watch->points; point != NULL; point = point->next)
{
schedule_watchpoint (sd, point);
}
return SIM_RC_OK;
}
static const OPTION watchpoint_options[] =
{
{ {"watch-delete", required_argument, NULL, OPTION_WATCH_DELETE },
'\0', "IDENT|all|pc|cycles|clock", "Delete a watchpoint",
watchpoint_option_handler, NULL },
{ {"watch-info", no_argument, NULL, OPTION_WATCH_INFO },
'\0', NULL, "List scheduled watchpoints",
watchpoint_option_handler, NULL },
{ {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
};
static const char *default_interrupt_names[] = { "int", 0, };
/* This default handler is "good enough" for targets that just want to trap into
gdb when watchpoints are hit, and have only configured the STATE_WATCHPOINTS
pc field. */
static void
default_interrupt_handler (SIM_DESC sd, void *data)
{
sim_cpu *cpu = STATE_CPU (sd, 0);
address_word cia = CPU_PC_GET (cpu);
sim_engine_halt (sd, cpu, NULL, cia, sim_stopped, SIM_SIGTRAP);
}
SIM_RC
sim_watchpoint_install (SIM_DESC sd)
{
sim_watchpoints *watch = STATE_WATCHPOINTS (sd);
SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
/* the basic command set */
sim_module_add_init_fn (sd, sim_watchpoint_init);
sim_add_option_table (sd, NULL, watchpoint_options);
/* fill in some details */
if (watch->interrupt_names == NULL)
watch->interrupt_names = default_interrupt_names;
if (watch->interrupt_handler == NULL)
watch->interrupt_handler = default_interrupt_handler;
watch->nr_interrupts = 0;
while (watch->interrupt_names[watch->nr_interrupts] != NULL)
watch->nr_interrupts++;
/* generate more advansed commands */
{
OPTION *int_options = NZALLOC (OPTION, 1 + (watch->nr_interrupts + 1) * nr_watchpoint_types);
int interrupt_nr;
for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++)
{
watchpoint_type type;
for (type = 0; type < nr_watchpoint_types; type++)
{
char *name;
int nr = interrupt_nr * nr_watchpoint_types + type;
OPTION *option = &int_options[nr];
if (asprintf (&name, "watch-%s-%s",
watchpoint_type_to_str (sd, type),
interrupt_nr_to_str (sd, interrupt_nr)) < 0)
return SIM_RC_FAIL;
option->opt.name = name;
option->opt.has_arg = required_argument;
option->opt.val = type_to_option (sd, type, interrupt_nr);
option->doc = "";
option->doc_name = "";
option->handler = watchpoint_option_handler;
}
}
/* adjust first few entries so that they contain real
documentation, the first entry includes a list of actions. */
{
const char *prefix =
"Watch the simulator, take ACTION in COUNT cycles (`+' for every COUNT cycles), ACTION is";
char *doc;
int len = strlen (prefix) + 1;
for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++)
len += strlen (interrupt_nr_to_str (sd, interrupt_nr)) + 1;
doc = NZALLOC (char, len);
strcpy (doc, prefix);
for (interrupt_nr = 0; interrupt_nr <= watch->nr_interrupts; interrupt_nr++)
{
strcat (doc, " ");
strcat (doc, interrupt_nr_to_str (sd, interrupt_nr));
}
int_options[0].doc_name = "watch-cycles-ACTION";
int_options[0].arg = "[+]COUNT";
int_options[0].doc = doc;
}
int_options[1].doc_name = "watch-pc-ACTION";
int_options[1].arg = "[!]ADDRESS";
int_options[1].doc =
"Watch the PC, take ACTION when matches ADDRESS (in range ADDRESS,ADDRESS), `!' negates test";
int_options[2].doc_name = "watch-clock-ACTION";
int_options[2].arg = "[+]MILLISECONDS";
int_options[2].doc =
"Watch the clock, take ACTION after MILLISECONDS (`+' for every MILLISECONDS)";
sim_add_option_table (sd, NULL, int_options);
}
return SIM_RC_OK;
}
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