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mos6522: add "info via" HMP command for debugging

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This displays detailed information about the device registers and timers to aid
debugging problems with timers and interrupts.

Currently the QAPI generators for HumanReadableText don't work correctly if
used in qapi/target-misc.json when a non-specified target is built, so for
now manually add a hmp_info_via() wrapper until direct support for per-device
HMP/QMP commands is implemented.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220305150957.5053-9-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2022-03-05 15:09:53 +00:00
parent 6c72669872
commit 409e9f7131
4 changed files with 121 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

103
hw/misc/mos6522.c
View file

@ -30,6 +30,9 @@
#include "hw/misc/mos6522.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "monitor/monitor.h"
#include "monitor/hmp.h"
#include "qapi/type-helpers.h"
#include "qemu/timer.h"
#include "qemu/cutils.h"
#include "qemu/log.h"
@ -415,6 +418,106 @@ void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
}
}
static int qmp_x_query_via_foreach(Object *obj, void *opaque)
{
GString *buf = opaque;
if (object_dynamic_cast(obj, TYPE_MOS6522)) {
MOS6522State *s = MOS6522(obj);
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
uint16_t t1counter = get_counter(s, &s->timers[0]);
uint16_t t2counter = get_counter(s, &s->timers[1]);
g_string_append_printf(buf, "%s:\n", object_get_typename(obj));
g_string_append_printf(buf, " Registers:\n");
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[0], s->b);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[1], s->a);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[2], s->dirb);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[3], s->dira);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[4], t1counter & 0xff);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[5], t1counter >> 8);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[6],
s->timers[0].latch & 0xff);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[7],
s->timers[0].latch >> 8);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[8], t2counter & 0xff);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[9], t2counter >> 8);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[10], s->sr);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[11], s->acr);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[12], s->pcr);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[13], s->ifr);
g_string_append_printf(buf, " %-*s: 0x%x\n", 4,
mos6522_reg_names[14], s->ier);
g_string_append_printf(buf, " Timers:\n");
g_string_append_printf(buf, " Using current time now(ns)=%"PRId64
"\n", now);
g_string_append_printf(buf, " T1 freq(hz)=%"PRId64
" mode=%s"
" counter=0x%x"
" latch=0x%x\n"
" load_time(ns)=%"PRId64
" next_irq_time(ns)=%"PRId64 "\n",
s->timers[0].frequency,
((s->acr & T1MODE) == T1MODE_CONT) ? "continuous"
: "one-shot",
t1counter,
s->timers[0].latch,
s->timers[0].load_time,
get_next_irq_time(s, &s->timers[0], now));
g_string_append_printf(buf, " T2 freq(hz)=%"PRId64
" mode=%s"
" counter=0x%x"
" latch=0x%x\n"
" load_time(ns)=%"PRId64
" next_irq_time(ns)=%"PRId64 "\n",
s->timers[1].frequency,
"one-shot",
t2counter,
s->timers[1].latch,
s->timers[1].load_time,
get_next_irq_time(s, &s->timers[1], now));
}
return 0;
}
static HumanReadableText *qmp_x_query_via(Error **errp)
{
g_autoptr(GString) buf = g_string_new("");
object_child_foreach_recursive(object_get_root(),
qmp_x_query_via_foreach, buf);
return human_readable_text_from_str(buf);
}
void hmp_info_via(Monitor *mon, const QDict *qdict)
{
Error *err = NULL;
g_autoptr(HumanReadableText) info = qmp_x_query_via(&err);
if (hmp_handle_error(mon, err)) {
return;
}
monitor_printf(mon, "%s", info->human_readable_text);
}
static const MemoryRegionOps mos6522_ops = {
.read = mos6522_read,
.write = mos6522_write,