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Pavel Dovgalyuk fda8458bd3 gdbstub: add reverse step support in replay mode 
GDB remote protocol supports two reverse debugging commands:
reverse step and reverse continue.
This patch adds support of the first one to the gdbstub.
Reverse step is intended to step one instruction in the backwards
direction. This is not possible in regular execution.
But replayed execution is deterministic, therefore we can load one of
the prior snapshots and proceed to the desired step. It is equivalent
to stepping one instruction back.
There should be at least one snapshot preceding the debugged part of
the replay log.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

--

v4 changes:
 - inverted condition in cpu_handle_guest_debug (suggested by Alex Bennée)
Message-Id: <160174522341.12451.1498758422543765253.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-06 08:34:49 +02:00
..
arch_type.c stubs: Add arch_type 2020-03-06 17:15:38 +01:00
bdrv-next-monitor-owned.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
blk-commit-all.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
blockdev-close-all-bdrv-states.c all: Clean up includes 2016-02-16 14:29:28 +00:00
change-state-handler.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
cmos.c stubs/cmos: Use correct include 2020-09-01 09:10:58 +02:00
cpu-get-clock.c cpu-timers, icount: new modules 2020-10-05 16:41:22 +02:00
cpu-synchronize-state.c cpus: prepare new CpusAccel cpu accelerator interface 2020-10-05 16:41:22 +02:00
cpus-get-virtual-clock.c cpus: prepare new CpusAccel cpu accelerator interface 2020-10-05 16:41:22 +02:00
dump.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
error-printf.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
fdset.c monitor: simplify functions for getting a dup'd fdset entry 2020-09-16 10:33:48 +01:00
fw_cfg.c hw/nvram/fw_cfg: Add fw_cfg_arch_key_name() 2019-05-23 14:10:31 +02:00
gdbstub.c Clean up includes some more 2016-03-22 22:20:16 +01:00
get-vm-name.c stubs: Clean up includes 2016-02-04 17:01:04 +00:00
icount.c icount: rename functions to be consistent with the module name 2020-10-05 16:41:22 +02:00
io_uring.c stubs: add stubs for io_uring interface 2020-01-30 20:59:41 +00:00
iothread-lock.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
iothread.c aio: introduce qemu_get_current_aio_context 2016-10-28 21:50:18 +08:00
is-daemonized.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
isa-bus.c stubs: add isa_create_simple 2020-07-06 17:01:11 +02:00
linux-aio.c linux-aio: properly bubble up errors from initialization 2018-06-27 13:06:34 +01:00
machine-init-done.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
meson.build cpus: prepare new CpusAccel cpu accelerator interface 2020-10-05 16:41:22 +02:00
migr-blocker.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
monitor-core.c qmp: Fail gracefully if chardev is already in use 2020-03-06 17:21:28 +01:00
monitor.c hmp: Fail gracefully if chardev is already in use 2020-03-06 17:21:28 +01:00
pci-bus.c stubs: add pci_create_simple 2020-07-06 17:01:11 +02:00
pci-host-piix.c hw/pci-host/piix: Move i440FX declarations to hw/pci-host/i440fx.h 2019-11-05 23:33:12 +01:00
qemu-timer-notify-cb.c cpu-timers, icount: new modules 2020-10-05 16:41:22 +02:00
qmp_memory_device.c qom/object: Move Object typedef to 'qemu/typedefs.h' 2020-06-10 12:09:36 -04:00
qtest.c cpu-timers, icount: new modules 2020-10-05 16:41:22 +02:00
ram-block.c exec: Change RAMBlockIterFunc definition 2019-03-06 10:49:17 +00:00
ramfb.c Revert "hw/display/ramfb: initialize fw-config space with xres/ yres" 2020-05-18 15:42:34 +02:00
replay-user.c replay: add BH oneshot event for block layer 2019-10-14 17:12:48 +02:00
replay.c gdbstub: add reverse step support in replay mode 2020-10-06 08:34:49 +02:00
runstate-check.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
semihost.c semihosting: add qemu_semihosting_console_inc for SYS_READC 2020-01-09 11:41:29 +00:00
set-fd-handler.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
sysbus.c stubs: Clean up includes 2016-02-04 17:01:04 +00:00
target-get-monitor-def.c Clean up includes some more 2016-03-22 22:20:16 +01:00
target-monitor-defs.c Clean up includes some more 2016-03-22 22:20:16 +01:00
tpm.c Revert "tpm: Clean up error reporting in tpm_init_tpmdev()" 2020-07-24 12:44:13 -04:00
trace-control.c trace: remove global 'uint16 dstate[]' array 2016-10-12 09:35:54 +02:00
uuid.c qapi: Restrict query-uuid command to machine code 2020-09-29 15:41:35 +02:00
vm-stop.c sysemu: Split sysemu/runstate.h off sysemu/sysemu.h 2019-08-16 13:37:36 +02:00
vmgenid.c qapi: Restrict query-vm-generation-id command to machine code 2020-09-29 15:41:35 +02:00
vmstate.c migration: Change SaveStateEntry.instance_id into uint32_t 2020-01-20 09:10:23 +01:00
win32-kbd-hook.c ui/win32-kbd-hook: handle AltGr in a hook procedure 2020-05-19 09:06:44 +02:00
xen-hw-stub.c hw/xen: Split x86-specific declaration from generic hardware ones 2020-09-30 19:11:36 +02:00