[ros-diffs] [ion] 26004: - Implement simple breakpoints (KdWriteBreakPointApi, KdpWriteBreakpoint, KdpAddBreakpoint). - Stepping out with WinDBG now works, but not adding breakpoints (that's KdWriteBreakpointExApi, coming up soon). - This was supposed to be 26000 but oh well, back porting features to a locked branch seems to have won out :)

Author: ion
Date: Mon Mar  5 20:09:44 2007
New Revision: 26004

URL: http://svn.reactos.org/svn/reactos?rev=26004&view=rev
Log:
- Implement simple breakpoints (KdWriteBreakPointApi, KdpWriteBreakpoint, KdpAddBreakpoint).
- Stepping out with WinDBG now works, but not adding breakpoints (that's KdWriteBreakpointExApi, coming up soon).
- This was supposed to be 26000 but oh well, back porting features to a locked branch seems to have won out :)

Modified:
    trunk/reactos/ntoskrnl/include/internal/kd64.h
    trunk/reactos/ntoskrnl/kd64/kdapi.c
    trunk/reactos/ntoskrnl/kd64/kdbreak.c

Modified: trunk/reactos/ntoskrnl/include/internal/kd64.h
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/k...
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/kd64.h (original)
+++ trunk/reactos/ntoskrnl/include/internal/kd64.h Mon Mar  5 20:09:44 2007
@@ -226,6 +226,12 @@
 KdpDeleteBreakpointRange(
     IN PVOID Base,
     IN PVOID Limit
+);
+
+ULONG
+NTAPI
+KdpAddBreakpoint(
+    IN PVOID Address
 );

//

Modified: trunk/reactos/ntoskrnl/kd64/kdapi.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kd64/kdapi.c?rev=2...
==============================================================================
--- trunk/reactos/ntoskrnl/kd64/kdapi.c (original)
+++ trunk/reactos/ntoskrnl/kd64/kdapi.c Mon Mar  5 20:09:44 2007
@@ -16,6 +16,37 @@

VOID
 NTAPI
+KdpWriteBreakpoint(IN PDBGKD_MANIPULATE_STATE64 State,
+                   IN PSTRING Data,
+                   IN PCONTEXT Context)
+{
+    PDBGKD_WRITE_BREAKPOINT64 Breakpoint = &State->u.WriteBreakPoint;
+    STRING Header;
+    NTSTATUS Status;
+
+    /* Build header */
+    Header.Length = sizeof(DBGKD_MANIPULATE_STATE64);
+    Header.Buffer = (PCHAR)State;
+    ASSERT(Data->Length == 0);
+
+    /* Create the breakpoint */
+    Breakpoint->BreakPointHandle =
+        KdpAddBreakpoint((PVOID)(LONG_PTR)Breakpoint->BreakPointAddress);
+    if (!Breakpoint->BreakPointHandle)
+    {
+        /* We failed */
+        Status = STATUS_UNSUCCESSFUL;
+    }
+
+    /* Send the packet */
+    KdSendPacket(PACKET_TYPE_KD_STATE_MANIPULATE,
+                 &Header,
+                 NULL,
+                 &KdpContext);
+}
+
+VOID
+NTAPI
 DumpTraceData(IN PSTRING TraceData)
 {
     /* Update the buffer */
@@ -545,9 +576,8 @@

case DbgKdWriteBreakPointApi:

-                /* FIXME: TODO */
-                Ke386SetCr2(DbgKdWriteBreakPointApi);
-                while (TRUE);
+                /* Write the breakpoint */
+                KdpWriteBreakpoint(&ManipulateState, &Data, Context);
                 break;

case DbgKdRestoreBreakPointApi:

Modified: trunk/reactos/ntoskrnl/kd64/kdbreak.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kd64/kdbreak.c?rev...
==============================================================================
--- trunk/reactos/ntoskrnl/kd64/kdbreak.c (original)
+++ trunk/reactos/ntoskrnl/kd64/kdbreak.c Mon Mar  5 20:09:44 2007
@@ -13,6 +13,54 @@
 #include <debug.h>

/* FUNCTIONS *****************************************************************/
+
+ULONG
+NTAPI
+KdpAddBreakpoint(IN PVOID Address)
+{
+    UCHAR Content;
+    ULONG i;
+
+    /* Loop current breakpoints */
+    for (i = 0; i < 20; i++)
+    {
+        /* Check if the breakpoint is valid */
+        if ((KdpBreakpointTable[i].Flags & KdpBreakpointActive) &&
+            (KdpBreakpointTable[i].Address == Address))
+        {
+            /* Check if it's pending */
+            if ((KdpBreakpointTable[i].Flags & KdpBreakpointPending))
+            {
+                /* It's not pending anymore now */
+                KdpBreakpointTable[i].Flags &= ~KdpBreakpointPending;
+                return i + 1;
+            }
+            else
+            {
+                /* Fail */
+                return 0;
+            }
+        }
+    }
+
+    /* Find a free entry */
+    for (i = 0; i < 20; i++) if (!(KdpBreakpointTable[i].Flags)) break;
+
+    /* Fail if no free entry was found */
+    if (i == 20) return 0;
+
+    /* Save the old instruction */
+    RtlCopyMemory(&Content, Address, sizeof(UCHAR));
+
+    /* Write the entry */
+    KdpBreakpointTable[i].Address = Address;
+    KdpBreakpointTable[i].Content = Content;
+    KdpBreakpointTable[i].Flags = KdpBreakpointActive;
+
+    /* Write the INT3 and return the handle */
+    RtlCopyMemory(Address, &KdpBreakpointInstruction, sizeof(UCHAR));
+    return i + 1;
+}

BOOLEAN
 NTAPI