EdbCmdStep.c

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#include "Edb.h"
 
BOOLEAN
IsEBCCALL (
  IN UINTN  Address
  )
{
  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
  )
{
  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
  )
{
  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
  )
{
  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
  )
{
  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;
}