MdeModulePkg/EbcDxe: add EBC Debugger

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Pete Batard <pete@akeo.ie>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbCmdStep.c

@@ -0,0 +1,198 @@
+/*++
+
+Copyright (c) 2007, Intel Corporation
+All rights reserved. This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+Module Name:
+
+  EdbCmdStep.c
+
+Abstract:
+
+
+--*/
+
+#include "Edb.h"
+
+BOOLEAN
+IsEBCCALL (
+  IN UINTN            Address
+  )
+/*++
+
+Routine Description:
+
+  Check whether current IP is EBC CALL instruction (NOTE: CALLEX is exclusive)
+
+Arguments:
+
+  Address   - EBC IP address.
+
+Returns:
+
+  TRUE  - Current IP is EBC CALL instruction
+  FALSE - Current IP is not EBC CALL instruction
+
+--*/
+{
+  if (GET_OPCODE(Address) != OPCODE_CALL) {
+    return FALSE;
+  }
+
+  if (GET_OPERANDS (Address) & OPERAND_M_NATIVE_CALL) {
+    return FALSE;
+  } else {
+    return TRUE;
+  }
+}
+
+BOOLEAN
+IsEBCRET (
+  IN UINTN            Address
+  )
+/*++
+
+Routine Description:
+
+  Check whether current IP is EBC RET instruction
+
+Arguments:
+
+  Address   - EBC IP address.
+
+Returns:
+
+  TRUE  - Current IP is EBC RET instruction
+  FALSE - Current IP is not EBC RET instruction
+
+--*/
+{
+  if (GET_OPCODE(Address) != OPCODE_RET) {
+    return FALSE;
+  }
+
+  if (GET_OPERANDS (Address) != 0) {
+    return FALSE;
+  } else {
+    return TRUE;
+  }
+}
+
+EFI_DEBUG_STATUS
+DebuggerStepInto (
+  IN     CHAR16                    *CommandArg,
+  IN     EFI_DEBUGGER_PRIVATE_DATA *DebuggerPrivate,
+  IN     EFI_EXCEPTION_TYPE        ExceptionType,
+  IN OUT EFI_SYSTEM_CONTEXT        SystemContext
+  )
+/*++
+
+Routine Description:
+
+  DebuggerCommand - StepInto
+
+Arguments:
+
+  CommandArg      - The argument for this command
+  DebuggerPrivate - EBC Debugger private data structure
+  InterruptType   - Interrupt type.
+  SystemContext   - EBC system context.
+
+Returns:
+
+  EFI_DEBUG_CONTINUE - formal return value
+
+--*/
+{
+  SystemContext.SystemContextEbc->Flags |= VMFLAGS_STEP;
+
+  return EFI_DEBUG_BREAK;
+}
+
+EFI_DEBUG_STATUS
+DebuggerStepOver (
+  IN     CHAR16                    *CommandArg,
+  IN     EFI_DEBUGGER_PRIVATE_DATA *DebuggerPrivate,
+  IN     EFI_EXCEPTION_TYPE        ExceptionType,
+  IN OUT EFI_SYSTEM_CONTEXT        SystemContext
+  )
+/*++
+
+Routine Description:
+
+  DebuggerCommand - StepOver
+
+Arguments:
+
+  CommandArg      - The argument for this command
+  DebuggerPrivate - EBC Debugger private data structure
+  InterruptType   - Interrupt type.
+  SystemContext   - EBC system context.
+
+Returns:
+
+  EFI_DEBUG_CONTINUE - formal return value
+
+--*/
+{
+  if (IsEBCCALL((UINTN)SystemContext.SystemContextEbc->Ip)) {
+    //
+    // Check CALL (NOTE: CALLEX is exclusive)
+    //
+    DebuggerPrivate->FeatureFlags |= EFI_DEBUG_FLAG_EBC_STEPOVER;
+  } else {
+    //
+    // Other instruction including CALLEX
+    //
+    SystemContext.SystemContextEbc->Flags |= VMFLAGS_STEP;
+  }
+
+  return EFI_DEBUG_BREAK;
+}
+
+EFI_DEBUG_STATUS
+DebuggerStepOut (
+  IN     CHAR16                    *CommandArg,
+  IN     EFI_DEBUGGER_PRIVATE_DATA *DebuggerPrivate,
+  IN     EFI_EXCEPTION_TYPE        ExceptionType,
+  IN OUT EFI_SYSTEM_CONTEXT        SystemContext
+  )
+/*++
+
+Routine Description:
+
+  DebuggerCommand - StepOut
+
+Arguments:
+
+  CommandArg      - The argument for this command
+  DebuggerPrivate - EBC Debugger private data structure
+  InterruptType   - Interrupt type.
+  SystemContext   - EBC system context.
+
+Returns:
+
+  EFI_DEBUG_CONTINUE - formal return value
+
+--*/
+{
+  if (IsEBCRET((UINTN)SystemContext.SystemContextEbc->Ip)) {
+    //
+    // Check RET
+    //
+    SystemContext.SystemContextEbc->Flags |= VMFLAGS_STEP;
+  } else {
+    //
+    // Other instruction
+    //
+    DebuggerPrivate->FeatureFlags |= EFI_DEBUG_FLAG_EBC_STEPOUT;
+  }
+
+  return EFI_DEBUG_BREAK;
+}