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[KDGDB] Adapt to amd64

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Jérôme Gardou 2021-04-14 13:36:17 +02:00 committed by Jérôme Gardou
parent 97858f3c87
commit 0eea78648c
4 changed files with 284 additions and 14 deletions
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4
drivers/base/kdgdb/CMakeLists.txt
View file

@ -10,9 +10,11 @@ list(APPEND SOURCE
utils.c
kdgdb.h)
# TODO: AMD64, ARM...
# TODO: ARM...
if(ARCH STREQUAL "i386")
list(APPEND SOURCE i386_sup.c)
elseif(ARCH STREQUAL "amd64")
list(APPEND SOURCE amd64_sup.c)
endif()
add_library(kdcom MODULE

263
drivers/base/kdgdb/amd64_sup.c Normal file
View file

@ -0,0 +1,263 @@
/*
* PROJECT: ReactOS KD dll - GDB stub
* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
* PURPOSE: Base functions for the kernel debugger
* COPYRIGHT: Copyright 2021 Jérôme Gardou
*/
#include "kdgdb.h"
enum reg_name
{
RAX, RBX, RCX, RDX, RSI, RDI, RBP, RSP,
R8, R9, R10, R11, R12, R13, R14, R15,
RIP,
EFLAGS,
CS, SS, DS, ES, FS, GS,
ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7,
FCTRL, FSTAT, FTAG, FISEG, FIOFF, FOSEG, FOOFF, FOP
};
static const unsigned char reg_size[] =
{
8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8, 8,
8,
4,
4, 4, 4, 4, 4, 4,
10, 10, 10, 10, 10, 10, 10, 10,
8, 8, 8, 8, 8, 8, 8, 8
};
static
void*
ctx_to_reg(CONTEXT* ctx, enum reg_name name)
{
switch (name)
{
case RAX: return &ctx->Rax;
case RBX: return &ctx->Rbx;
case RCX: return &ctx->Rcx;
case RDX: return &ctx->Rdx;
case RSP: return &ctx->Rsp;
case RBP: return &ctx->Rbp;
case RSI: return &ctx->Rsi;
case RDI: return &ctx->Rdi;
case RIP: return &ctx->Rip;
case R8: return &ctx->R8;
case R9: return &ctx->R9;
case R10: return &ctx->R10;
case R11: return &ctx->R11;
case R12: return &ctx->R12;
case R13: return &ctx->R13;
case R14: return &ctx->R14;
case R15: return &ctx->R15;
case EFLAGS: return &ctx->EFlags;
case CS: return &ctx->SegCs;
case DS: return &ctx->SegSs;
case ES: return &ctx->SegEs;
case FS: return &ctx->SegFs;
case GS: return &ctx->SegGs;
case SS: return &ctx->SegSs;
}
#undef return_reg
return 0;
}
static
void*
thread_to_reg(PETHREAD Thread, enum reg_name reg_name)
{
static const void* NullValue = NULL;
#if 0
if (Thread->Tcb.TrapFrame)
{
PKTRAP_FRAME TrapFrame = Thread->Tcb.TrapFrame;
switch (reg_name)
{
case RAX: return &TrapFrame->Rax;
case RBX: return &TrapFrame->Rbx;
case RCX: return &TrapFrame->Rcx;
case RDX: return &TrapFrame->Rdx;
case RSP: return &TrapFrame->Rsp;
case RBP: return &TrapFrame->Rbp;
case RSI: return &TrapFrame->Rsi;
case RDI: return &TrapFrame->Rdi;
case RIP: return &TrapFrame->Rip;
case R8: return &TrapFrame->R8;
case R9: return &TrapFrame->R9;
case R10: return &TrapFrame->R10;
case R11: return &TrapFrame->R11;
case EFLAGS: return &TrapFrame->EFlags;
case CS: return &TrapFrame->SegCs;
case DS: return &TrapFrame->SegSs;
case ES: return &TrapFrame->SegEs;
case FS: return &TrapFrame->SegFs;
case GS: return &TrapFrame->SegGs;
case SS: return &TrapFrame->SegSs;
default:
KDDBGPRINT("Unhandled regname: %d.\n", reg_name);
}
}
else
#endif
if (!Thread->Tcb.InitialStack)
{
/* Terminated thread ? */
switch (reg_name)
{
case RSP:
case RBP:
case RIP:
KDDBGPRINT("Returning NULL for register %d.\n", reg_name);
return &NullValue;
default:
return NULL;
}
}
else
{
switch(reg_name)
{
case RSP: return &Thread->Tcb.KernelStack;
case RIP:
{
PULONG_PTR Rsp = Thread->Tcb.KernelStack;
return &Rsp[3];
}
case RBP:
{
PULONG_PTR Rsp = Thread->Tcb.KernelStack;
return &Rsp[4];
}
default:
return NULL;
}
}
return NULL;
}
KDSTATUS
gdb_send_registers(void)
{
CHAR RegisterStr[17];
UCHAR* RegisterPtr;
unsigned short i;
unsigned short size;
start_gdb_packet();
KDDBGPRINT("Sending registers of thread %" PRIxPTR ".\n", gdb_dbg_tid);
KDDBGPRINT("Current thread_id: %p.\n", PsGetThreadId((PETHREAD)(ULONG_PTR)CurrentStateChange.Thread));
if (((gdb_dbg_pid == 0) && (gdb_dbg_tid == 0)) ||
gdb_tid_to_handle(gdb_dbg_tid) == PsGetThreadId((PETHREAD)(ULONG_PTR)CurrentStateChange.Thread))
{
for (i = 0; i < 24; i++)
{
RegisterPtr = ctx_to_reg(&CurrentContext, i);
size = reg_size[i] * 2;
RegisterStr[size] = 0;
while (size)
{
size--;
RegisterStr[size] = hex_chars[RegisterPtr[size/2] & 0xF];
size--;
RegisterStr[size] = hex_chars[RegisterPtr[size/2] >> 4];
}
send_gdb_partial_packet(RegisterStr);
}
}
else
{
PETHREAD DbgThread;
DbgThread = find_thread(gdb_dbg_pid, gdb_dbg_tid);
if (DbgThread == NULL)
{
/* Thread is dead */
send_gdb_partial_packet("E03");
return finish_gdb_packet();
}
for (i = 0; i < 24; i++)
{
RegisterPtr = thread_to_reg(DbgThread, i);
size = reg_size[i] * 2;
RegisterStr[size] = 0;
while (size)
{
if (RegisterPtr)
{
size--;
RegisterStr[size] = hex_chars[RegisterPtr[size/2] & 0xF];
size--;
RegisterStr[size] = hex_chars[RegisterPtr[size/2] >> 4];
}
else
{
size--;
RegisterStr[size] = 'x';
size--;
RegisterStr[size] = 'x';
}
}
send_gdb_partial_packet(RegisterStr);
}
}
return finish_gdb_packet();
}
KDSTATUS
gdb_send_register(void)
{
enum reg_name reg_name;
void *ptr;
/* Get the GDB register name (gdb_input = "pXX") */
reg_name = (hex_value(gdb_input[1]) << 4) | hex_value(gdb_input[2]);
if (((gdb_dbg_pid == 0) && (gdb_dbg_tid == 0)) ||
gdb_tid_to_handle(gdb_dbg_tid) == PsGetThreadId((PETHREAD)(ULONG_PTR)CurrentStateChange.Thread))
{
/* We can get it from the context of the current exception */
ptr = ctx_to_reg(&CurrentContext, reg_name);
}
else
{
PETHREAD DbgThread;
DbgThread = find_thread(gdb_dbg_pid, gdb_dbg_tid);
if (DbgThread == NULL)
{
/* Thread is dead */
return send_gdb_packet("E03");
}
ptr = thread_to_reg(DbgThread, reg_name);
}
if (!ptr)
{
unsigned char size = reg_size[reg_name];
start_gdb_packet();
while (size--)
send_gdb_partial_packet("xx");
return finish_gdb_packet();
}
else
{
KDDBGPRINT("KDDBG : Sending registers as memory.\n");
return send_gdb_memory(ptr, reg_size[reg_name]);
}
}

18
drivers/base/kdgdb/gdb_input.c
View file

@ -301,12 +301,6 @@ handle_gdb_query(void)
return gdb_send_debug_io(&String, FALSE);
}
if (strncmp(gdb_input, "qOffsets", 8) == 0)
{
/* We load ntoskrnl at 0x80800000 while compiling it at 0x00800000 base address */
return send_gdb_packet("TextSeg=80000000");
}
if (strcmp(gdb_input, "qTStatus") == 0)
{
/* No tracepoint support */
@ -323,7 +317,7 @@ handle_gdb_query(void)
{
static LIST_ENTRY* CurrentEntry = NULL;
char str_helper[256];
char name_helper[64];
char name_helper[64];
ULONG_PTR Offset = hex_to_address(&gdb_input[22]);
ULONG_PTR ToSend = hex_to_address(strstr(&gdb_input[22], ",") + 1);
ULONG Sent = 0;
@ -381,7 +375,7 @@ handle_gdb_query(void)
/* GDB doesn't load the file if you don't prefix it with a drive letter... */
mem_length = _snprintf(str_helper, 256, "<library name=\"C:\\%s\"><segment address=\"0x%p\"/></library>", &name_helper, DllBase);
/* DLL name must be too long. */
if (mem_length < 0)
{
@ -639,7 +633,7 @@ handle_gdb_write_mem(
/* Nothing to do */
return LOOP_IF_SUCCESS(send_gdb_packet("OK"));
}
State->u.WriteMemory.TransferCount = BufferLength;
MessageData->Length = BufferLength;
MessageData->Buffer = (CHAR*)OutBuffer;
@ -794,7 +788,7 @@ RestoreBreakPointSendHandler(
KDDBGPRINT("Wrong API number (%lu) after DbgKdRestoreBreakPointApi request.\n", State->ApiNumber);
}
/* We ignore failure here. If DbgKdRestoreBreakPointApi fails,
/* We ignore failure here. If DbgKdRestoreBreakPointApi fails,
* this means that the breakpoint was already invalid for KD. So clean it up on our side. */
for (i = 0; i < (sizeof(BreakPointHandles) / sizeof(BreakPointHandles[0])); i++)
{
@ -879,7 +873,7 @@ handle_gdb_c(
Status = send_gdb_packet("OK");
if (Status != KdPacketReceived)
return Status;
if (CurrentStateChange.NewState == DbgKdExceptionStateChange)
{
@ -967,7 +961,7 @@ handle_gdb_v(
if (strncmp(gdb_input, "vCont;s", 7) == 0)
{
return handle_gdb_s(State, MessageData, MessageLength, KdContext);
}
}

13
drivers/base/kdgdb/kdgdb.h
View file

@ -19,7 +19,7 @@
#include <pstypes.h>
// #define KDDEBUG /* uncomment to enable debugging this dll */
#define KDDEBUG /* uncomment to enable debugging this dll */
/* To undefine once https://sourceware.org/bugzilla/show_bug.cgi?id=17397 is resolved */
#define MONOPROCESS 1
@ -132,6 +132,17 @@ extern KDSTATUS gdb_send_registers(void);
# define KD_BREAKPOINT_SIZE sizeof(UCHAR)
# define KD_BREAKPOINT_VALUE 0xCC
/* Single step mode */
# define KdpSetSingleStep(Context) \
((Context)->EFlags |= EFLAGS_TF)
#elif defined(_M_AMD64)
# define KdpGetContextPc(Context) \
((Context)->Rip)
# define KdpSetContextPc(Context, ProgramCounter) \
((Context)->Rip = (ProgramCounter))
# define KD_BREAKPOINT_TYPE UCHAR
# define KD_BREAKPOINT_SIZE sizeof(UCHAR)
# define KD_BREAKPOINT_VALUE 0xCC
/* Single step mode */
# define KdpSetSingleStep(Context) \
((Context)->EFlags |= EFLAGS_TF)
#else