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binutils-gdb/sim/common/sim-watch.c
Mike Frysinger 6df01ab8ab sim: switch config.h usage to defs.h 
The defs.h header will take care of including the various config.h
headers.  For now, it's just config.h, but we'll add more when we
integrate gnulib in.

This header should be used instead of config.h, and should be the
first include in every .c file.  We won't rely on the old behavior
where we expected files to include the port's sim-main.h which then
includes the common sim-basics.h which then includes config.h.  We
have a ton of code that includes things before sim-main.h, and it
sometimes needs to be that way.  Creating a dedicated header avoids
the ordering mess and implicit inclusion that shows up otherwise.
2021-05-16 22:38:41 -04:00

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/* Generic simulator watchpoint support.
Copyright (C) 1997-2021 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 "sim-main.h"
#include "sim-options.h"
#include "libiberty.h"
#include "sim-assert.h"
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.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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