Addendum to commit de892d5b.
The boot options get stripped of their optional command switch '/'
(and replaced by whitspace separation) by the NT loader. Also, forbid
the presence of space between the optional '=' character following
(NO)LOADSYMBOLS.
In addition, fix the default initialization of LoadSymbols in KdbSymInit():
we cannot rely on MmNumberOfPhysicalPages in BootPhase 0 since at this point,
the Memory Manager hasn't been initialized and this variable is not yet set.
(We are called by KdInitSystem(0) -> KdDebuggerInitialize0 at kernel init.)
It gets initialized later on between BootPhase 0 and 1.
Also display a nice KDBG signon showing the status of symbols loading.
CORE-17470
+ KdpDebugLogInit: Add resources cleanup in failure code paths.
Fix, in an NT-compatible manner, how (and when) the KD/KDBG BootPhase >=2
initialization steps are performed.
These are necessary for any functionality KDBG needs, that would depend
on the NT I/O Manager and the storage and filesystem stacks to be running.
This includes, creating the debug log file, and for KDBG, loading its
KDBinit initialization file.
As a result, file debug logging is fixed.
The old ReactOS-specific (NT-incompatible) callback we did in the middle
of IoInitSystem() is removed, in favor of a runtime mechanism that should
work on Windows as well.
The idea for this new mechanism is loosely inspired by the TDL4 rootkit,
see http://blog.w4kfu.com/public/tdl4_article/draft_tdl4article.html
but contrary to it, a specific hook is used instead, as well as the
technique of driver reinitialization:
https://web.archive.org/web/20211021050515/https://driverentry.com.br/en/blog/?p=261
Its rationale is as follows:
We want to be able to perform I/O-related initialization (starting a
logger thread for file log debugging, loading KDBinit file for KDBG,
etc.). A good place for this would be as early as possible, once the
I/O Manager has started the storage and the boot filesystem drivers.
Here is an overview of the initialization steps of the NT Kernel and
Executive:
----
KiSystemStartup(KeLoaderBlock)
if (Cpu == 0) KdInitSystem(0, KeLoaderBlock);
KiSwitchToBootStack() -> KiSystemStartupBootStack()
-> KiInitializeKernel() -> ExpInitializeExecutive(Cpu, KeLoaderBlock)
(NOTE: Any unexpected debugger break will call KdInitSystem(0, NULL); )
KdInitSystem(0, LoaderBlock) -> KdDebuggerInitialize0(LoaderBlock);
ExpInitializeExecutive(Cpu == 0): ExpInitializationPhase = 0;
HalInitSystem(0, KeLoaderBlock); <-- Sets HalInitPnpDriver callback.
...
PsInitSystem(LoaderBlock)
PsCreateSystemThread(Phase1Initialization)
Phase1Initialization(Discard): ExpInitializationPhase = 1;
HalInitSystem(1, KeLoaderBlock);
...
Early initialization of Ob, Ex, Ke.
KdInitSystem(1, KeLoaderBlock);
...
KdDebuggerInitialize1(LoaderBlock);
...
IoInitSystem(LoaderBlock);
...
----
As we can see, KdDebuggerInitialize1() is the last KD initialization
routine the kernel calls, and is called *before* the I/O Manager starts.
Thus, direct Nt/ZwCreateFile ... calls done there would fail. Also,
we want to do the I/O initialization as soon as possible. There does
not seem to be any exported way to be notified about the I/O manager
initialization steps... that is, unless we somehow become a driver and
insert ourselves in the flow!
Since we are not a regular driver, we need to invoke IoCreateDriver()
to create one. However, remember that we are currently running *before*
IoInitSystem(), the I/O subsystem is not initialized yet. Due to this,
calling IoCreateDriver(), much like any other IO functions, would lead
to a crash, because it calls
ObCreateObject(..., IoDriverObjectType, ...), and IoDriverObjectType
is non-initialized yet (it's NULL).
The chosen solution is to hook a "known" exported callback: namely, the
HalInitPnpDriver() callback (it initializes the "HAL Root Bus Driver").
It is set very early on by the HAL via the HalInitSystem(0, ...) call,
and is called early on by IoInitSystem() before any driver is loaded,
but after the I/O Manager has been minimally set up so that new drivers
can be created.
When the hook: KdpInitDriver() is called, we create our driver with
IoCreateDriver(), specifying its entrypoint KdpDriverEntry(), then
restore and call the original HalInitPnpDriver() callback.
Another possible unexplored alternative, could be to insert ourselves
in the KeLoaderBlock->LoadOrderListHead boot modules list, or in the
KeLoaderBlock->BootDriverListHead boot-driver list. (Note that while
we may be able to do this, because boot-drivers are resident in memory,
much like we are, we cannot insert ourselves in the system-driver list
however, since those drivers are expected to come from PE image files.)
Once the KdpDriverEntry() driver entrypoint is called, we register
KdpDriverReinit() for re-initialization with the I/O Manager, in order
to provide more initialization points. KdpDriverReinit() calls the KD
providers at BootPhase >= 2, and schedules further reinitializations
(at most 3 more) if any of the providers request so.
CORE-10749
The dmesg command is now available even if screen output is disabled.
Co-authored-by: Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>
- KdbSymInit() in kdb_symbols.c only initializes symbols implementation
support.
- The rest of KdbInitialize gets moved into kdb_cli.c and initializes
the KDBG debugger itself.
- Move KdbDebugPrint to kdb_cli.c as well.
- Don't read anything and return immediately if the buffer size is zero.
- Allow the controlling keys (up/down arrows, backspace) even if the
buffer is full! (especially backspace if too much has been written).
- Return the number of characters stored, not counting the NULL terminator.
- Line-wrapping is enabled with 'ESC[?7h' (the '?' was forgotten).
Notice that the following reference also shows it wrong:
https://www.cse.psu.edu/~kxc104/class/cse472/09s/hw/hw7/vt100ansi.htm
- Terminal type is actually queried with 'ESC Z' (VT52-compatible), or
with 'ESC[c' (VT100-compatible). The antediluvian CTRL-E ('\x05')
control code gives instead a user-configurable (usually empty) string,
so it's not reliable.
Also, we don't really care about the returned result, we just need to
know that one has been sent.
Cross-checked with online documentation:
* "Digital VT100 User Guide" (EK-VT100-UG-001) (1st edition, August 1978,
reviewed November 1978).
* https://www.real-world-systems.com/docs/ANSIcode.html
* https://geoffg.net/Downloads/Terminal/TerminalEscapeCodes.pdf
* https://invisible-island.net/xterm/ctlseqs/ctlseqs.html
* https://en.wikipedia.org/wiki/Enquiry_character
- Retrieve the size of the *controlling terminal* with escape sequences
only when it's a serial one: serial output is enabled *and* KDSERIAL
is set (i.e. user input through serial). See code for the actual logic
(the corresponding truth table is left as an exercise for the reader).
- Fix also a "Buffer" vs. "InBuffer" mismatch, that caused the whole
code to fail.
- For fallback terminal size values, use meaningful ones when SCREEN
is instead the controlling "terminal" (based on full-size BOOTVID
values).
- When echoing read characters during line-cooking, do direct output by
using KdpDprintf() instead of going through the heavy KdbpPrint() function.
This fixes some input artifacts like: 1. extra slowdowns due to
querying terminal size at each keypress, and 2. getting obnoxious
"--- Press q to abort ..." prompts in the middle of typing a long
comamnd because you are at the very bottom of the screen.
KD64: Raise to HIGH_LEVEL when entering trap
KDBG: lower to DISPATCH_LEVEL when applying IRQL hack & use a worker thread to load symbols
KD&KDBG: Actually unload symbols when required
Our legacy KD module is slowly being phased out for the more recent KD64
Kernel Debugger that supports WinDbg, but at the same time we must retain
support for GCC debugging and the KDBG interface.
For the time being few #ifdef _WINKD_ have been introduced in KD64 so that
some of its code/data does not completely get shared yet with the legacy KD,
until the latter becomes phased out.
KD Modifications:
=================
- Remove the implementation of NtQueryDebugFilterState() /
NtSetDebugFilterState() that now comes entirely from KD64.
- Remove KD variables that are now shared with KD64.
- Share common code with KD64: KdpMoveMemory(), KdpZeroMemory(),
KdpCopyMemoryChunks(), KdpPrint(), KdpPrompt().
- KDBG: Remove the duplicated KdpCopyMemoryChunks() function.
- In KdpServiceDispatcher() and KdpEnterDebuggerException(), call the
KdpPrint() worker function that correctly probes and captures its arguments.
- Temporarily stub out KdEnterDebugger() and KdExitDebugger() that is used
by the shared code, until KD is removed and only the KD64 version of these
functions remain.
- Re-implement the KD/KDBG KdpPrompt() function using a custom KdpPromptString()
helper compatible with KD64, that is called by the KD64 implementation of
KdpPrompt(). This KdpPromptString() helper now issues the prompt on all
the KD loggers: e.g. if you use both at the same time COM-port and SCREEN
debugging, the prompt will appear on both. Before that the prompt was always
being displayed on COM port even if e.g. a SCREEN-only debug session was used...
- ppc_irq.c: Fix the prototype of KdpServiceDispatcher().
KD64 Fixes:
===========
- Initialize the MaximumLength member of the counted STRING variables
before using them elsewhere.
- Get rid of alloca() within SEH block in KdpPrint() (addendum to 7b95fcf9).
- Add the ROS-specific handy dump commands in KdSystemDebugControl().
- KD64: Update the list of supported Debug Filter Masks (KdComponentTable)
with the more up-to-date one from KDBG, that includes some components
that have been added in Vista+, but some of which we also use in ReactOS.
- NtQueryDebugFilterState(), NtSetDebugFilterState() and KdpPrint():
Add the Vista+ behaviour or falling back to the DEFAULT component ID
settings for unknown Components (compiled in only wheen NTDDI_VERSION >= NTDDI_VISTA).
+ Remove redundant comments and update these functions with SAL2 annotations.
- KDBG: Add extra documentation for the debug filter components list.
- CONFIG: Load all the supported Debug Filter Masks settings from the
registry.
CORE-16448, PR #2003. Supersedes PR #1997.
This commit supersedes commit 6c5c7809 (r54503).
The original code was checking for the NMI or Double-Fault TSS by
comparing the current stack-traced EIP address with their corresponding
trap handler address ranges. That method was actually buggy because
nothing was ensuring that the trap handlers were in the "expected" order
in the kernel binary (and in memory).
Instead, we now can handle completely generic nested TSSes, instead of
just the NMI or the Double-Fault ones.
The way we proceed is by performing the full stack backtrace of the
current TSS, then once finished we check whether this TSS is nested
(has a parent). If so we change the (cached) current TSS to the latter,
restarting the backtrace at the parent TSS' latest EIP.
Examples of stack backtraces:
=============================
- General Protection fault:
<snip>
*** Fatal System Error: 0x0000007f
(0x0000000D,0x00000000,0x00000000,0x00000000)
Entered debugger on embedded INT3 at 0x0008:0x80953528.
kdb:> bt
Eip:
<ntoskrnl.exe:153529 (sdk/lib/rtl/i386/debug_asm.S:57 (RtlpBreakWithStatusInstruction))>
Frames:
<ntoskrnl.exe:899b0 (ntoskrnl/ke/bug.c:1136 (KeBugCheckWithTf))>
<ntoskrnl.exe:134826 (ntoskrnl/ke/i386/exp.c:1161 (KeRaiseUserException))>
<ntoskrnl.exe:19ae67 (ntoskrnl/ke/i386/traphdlr.c:1282 (KiTrap0DHandler))>
<ntoskrnl.exe:19a840 (:0 (KiTrap0D))>
<ntoskrnl.exe:1925e6 (ntoskrnl/include/internal/i386/intrin_i.h:45 (KiInitMachineDependent))>
<ntoskrnl.exe:187688 (ntoskrnl/ke/krnlinit.c:305 (KeInitSystem))>
<ntoskrnl.exe:17fb2f (ntoskrnl/ex/init.c:1621 (Phase1InitializationDiscard))>
<ntoskrnl.exe:3247f (ntoskrnl/ex/init.c:2019 (Phase1Initialization))>
<ntoskrnl.exe:11c079 (ntoskrnl/ps/thread.c:156 (PspSystemThreadStartup))>
<ntoskrnl.exe:135c8a (ntoskrnl/ke/i386/thrdini.c:78 (KiThreadStartup))>
<ntoskrnl.exe:11c040 (ntoskrnl/ps/thread.c:141 (PspSystemThreadStartup))>
<5d8950ec>
Couldn't access memory at 0x83E58959!
</snip>
- Double-fault (manually triggered by removing the GP handler):
Note how the backtrace explicitly specifies the crossed TSS boundaries,
and the trace in the parent TSS is indeed consistent with the previous
example. Note also that log2lines (used here to completely resolve the
trace) failed to see KiTrap08Handler(), which has been instead mistaken
for KiTrap09().
<snip>
*** Fatal System Error: 0x0000007f
(0x00000008,0x8009C000,0x00000000,0x00000000)
Entered debugger on embedded INT3 at 0x0008:0x80953528.
kdb:> bt
[Active TSS 0x0050 @ 0x80A10CA0]
Eip:
<ntoskrnl.exe:153529 (sdk/lib/rtl/i386/debug_asm.S:57 (RtlpBreakWithStatusInstruction))>
Frames:
<ntoskrnl.exe:899b0 (ntoskrnl/ke/bug.c:1136 (KeBugCheckWithTf))>
<ntoskrnl.exe:19a1d8 (ntoskrnl/ke/i386/traphdlr.c:917 (KiTrap09))> // <-- Here, log2lines fails to see it's actually KiTrap08Handler.
<ntoskrnl.exe:19a145 (:0 (KiTrap08))>
[Parent TSS 0x0028 @ 0x8009C000]
<ntoskrnl.exe:1925e6 (ntoskrnl/include/internal/i386/intrin_i.h:45 (KiInitMachineDependent))>
<ntoskrnl.exe:187688 (ntoskrnl/ke/krnlinit.c:305 (KeInitSystem))>
<ntoskrnl.exe:17fb2f (ntoskrnl/ex/init.c:1621 (Phase1InitializationDiscard))>
<ntoskrnl.exe:3247f (ntoskrnl/ex/init.c:2019 (Phase1Initialization))>
<ntoskrnl.exe:11c079 (ntoskrnl/ps/thread.c:156 (PspSystemThreadStartup))>
<ntoskrnl.exe:135c8a (ntoskrnl/ke/i386/thrdini.c:78 (KiThreadStartup))>
<ntoskrnl.exe:11c040 (ntoskrnl/ps/thread.c:141 (PspSystemThreadStartup))>
<5d8950ec>
Couldn't access memory at 0x83E58959!
</snip>
We allow specifying manually the TSS selector number or its descriptor address,
and dump more information from the associated KTSS structure.
Also add the KdbpRetrieveTss() helper to retrieve the PKTSS from its
corresponding selector number. It will also be useful for future improvements.
- Always include kd64.h
- Change KdpPrompt() prototype to be compatible between KDBG and _WINDK_
- Rename KdComponentTable to KdpComponentTable to prevent a conflict
- Add some functions stubs and global variables
This allows avoiding one of the previous implementation limits:
leaked IRP not queued to a thread are now totally visible since
we look directly in the memory pool.
For now, it allows searching for pool allocations in
both paged and non paged pool.
It is based on Andreas Schuster work to identify POOL_HEADER
structures.
This is far from perfect, and totally doesn't match the
WinDBG way of doing it. Instead of browsing pool to find
matching 'IRP' tags, we just browse all the processes
to find the queued IRP. This requires the IRPs to be queued,
obviously, and will make us miss the leaked IRPs, for instance.
Proper way to do it would be to implement !poolfind and then
rely on its implementation to find our IRPs.
Perhaps later ;-)
