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[NTOS:KDBG] Add back 'cregs' command

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This command was removed in commit baa47fa5e0
because there was no way to get the CRx registers from a CONTEXT structure.
Previous code was also displaying current GDTR/LDTR and IDT.

Rewrite the code to use KdSystemDebugControl(SysDbgReadControlSpace, ...)
to get CRx, GDTR/LDTR and IDT values just before entering debugger.
This commit is contained in:
Hervé Poussineau 2024-10-12 07:46:41 +02:00
parent 2f23e70ad5
commit 70bf3bb8fa
1 changed files with 79 additions and 0 deletions
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79
ntoskrnl/kdbg/kdb_cli.c
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@ -353,6 +353,7 @@ static const struct
#endif // _M_IX86
{ "x", "x [address] [L count]", "Display count dwords, starting at address.", KdbpCmdDisassembleX },
{ "regs", "regs", "Display general purpose registers.", KdbpCmdRegs },
{ "cregs", "cregs", "Display control, descriptor table and task segment registers.", KdbpCmdRegs },
{ "sregs", "sregs", "Display status registers.", KdbpCmdRegs },
{ "dregs", "dregs", "Display debug registers.", KdbpCmdRegs },
{ "bt", "bt [*frameaddr|thread id]", "Prints current backtrace or from given frame address.", KdbpCmdBackTrace },
@ -984,6 +985,84 @@ KdbpCmdRegs(
}
KdbpPrint("\n");
}
else if (Argv[0][0] == 'c') /* cregs */
{
ULONG Cr0, Cr2, Cr3, Cr4;
KDESCRIPTOR Gdtr = {0, 0, 0}, Idtr = {0, 0, 0};
USHORT Ldtr, Tr;
static const PCHAR Cr0Bits[32] = { " PE", " MP", " EM", " TS", " ET", " NE", NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
" WP", NULL, " AM", NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, " NW", " CD", " PG" };
static const PCHAR Cr4Bits[32] = { " VME", " PVI", " TSD", " DE", " PSE", " PAE", " MCE", " PGE",
" PCE", " OSFXSR", " OSXMMEXCPT", NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
SYSDBG_CONTROL_SPACE Input;
KSPECIAL_REGISTERS SpecialRegisters;
NTSTATUS Status = STATUS_NOT_IMPLEMENTED;
/* Retrieve the control registers */
RtlZeroMemory(&Input, sizeof(Input));
Input.Buffer = &SpecialRegisters;
Input.Request = sizeof(SpecialRegisters);
#ifdef _M_IX86
Input.Address = sizeof(CONTEXT);
#else
Input.Address = AMD64_DEBUG_CONTROL_SPACE_KSPECIAL;
#endif
Status = KdSystemDebugControl(SysDbgReadControlSpace,
&Input, sizeof(Input),
NULL, 0,
NULL, KernelMode);
if (!NT_SUCCESS(Status))
{
KdbpPrint("Failed to get registers: status 0x%08x\n", Status);
return TRUE;
}
Cr0 = SpecialRegisters.Cr0;
Cr2 = SpecialRegisters.Cr2;
Cr3 = SpecialRegisters.Cr3;
Cr4 = SpecialRegisters.Cr4;
/* Retrieve the descriptor table and task segment registers */
Gdtr = SpecialRegisters.Gdtr;
Ldtr = SpecialRegisters.Ldtr;
Idtr = SpecialRegisters.Idtr;
Tr = SpecialRegisters.Tr;
/* Display the control registers */
KdbpPrint("CR0 0x%08x ", Cr0);
for (i = 0; i < 32; i++)
{
if (!Cr0Bits[i])
continue;
if ((Cr0 & (1 << i)) != 0)
KdbpPrint(Cr0Bits[i]);
}
KdbpPrint("\n");
KdbpPrint("CR2 0x%08x\n", Cr2);
KdbpPrint("CR3 0x%08x Pagedir-Base 0x%08x %s%s\n", Cr3, (Cr3 & 0xfffff000),
(Cr3 & (1 << 3)) ? " PWT" : "", (Cr3 & (1 << 4)) ? " PCD" : "" );
KdbpPrint("CR4 0x%08x ", Cr4);
for (i = 0; i < 32; i++)
{
if (!Cr4Bits[i])
continue;
if ((Cr4 & (1 << i)) != 0)
KdbpPrint(Cr4Bits[i]);
}
KdbpPrint("\n");
/* Display the descriptor table and task segment registers */
KdbpPrint("GDTR Base 0x%08x Size 0x%04x\n", Gdtr.Base, Gdtr.Limit);
KdbpPrint("LDTR 0x%04x\n", Ldtr);
KdbpPrint("IDTR Base 0x%08x Size 0x%04x\n", Idtr.Base, Idtr.Limit);
KdbpPrint("TR 0x%04x\n", Tr);
}
else if (Argv[0][0] == 's') /* sregs */
{
KdbpPrint("CS 0x%04x Index 0x%04x %cDT RPL%d\n",