system76-edk2/MdeModulePkg/Library/PeiDebugLibDebugPpi/DebugLib.c

/** @file
  PEI debug lib instance base on gEdkiiDebugPpiGuid to save PEIM size.

  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <PiPei.h>
#include <Ppi/Debug.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/PcdLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/DebugPrintErrorLevelLib.h>
#include <Library/BaseLib.h>

/**
  Prints a debug message to the debug output device if the specified
  error level is enabled.

  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
  GetDebugPrintErrorLevel (), then print the message specified by Format and
  the associated variable argument list to the debug output device.

  If Format is NULL, then ASSERT().

  @param  ErrorLevel    The error level of the debug message.
  @param  Format        Format string for the debug message to print.
  @param  ...           Variable argument list whose contents are accessed
                        based on the format string specified by Format.

**/
VOID
EFIAPI
DebugPrint (
  IN  UINTN        ErrorLevel,
  IN  CONST CHAR8  *Format,
  ...
  )
{
  VA_LIST  Marker;

  VA_START (Marker, Format);
  DebugVPrint (ErrorLevel, Format, Marker);
  VA_END (Marker);
}

/**
  Prints a debug message to the debug output device if the specified
  error level is enabled.
  This function use BASE_LIST which would provide a more compatible
  service than VA_LIST.

  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
  GetDebugPrintErrorLevel (), then print the message specified by Format and
  the associated variable argument list to the debug output device.

  If Format is NULL, then ASSERT().

  @param  ErrorLevel      The error level of the debug message.
  @param  Format          Format string for the debug message to print.
  @param  BaseListMarker  BASE_LIST marker for the variable argument list.

**/
VOID
EFIAPI
DebugBPrint (
  IN  UINTN        ErrorLevel,
  IN  CONST CHAR8  *Format,
  IN  BASE_LIST    BaseListMarker
  )
{
  EFI_STATUS       Status;
  EDKII_DEBUG_PPI  *DebugPpi;

  //
  // If Format is NULL, then ASSERT().
  //
  ASSERT (Format != NULL);

  //
  // Check driver Debug Level value and global debug level
  //
  if ((ErrorLevel & GetDebugPrintErrorLevel ()) == 0) {
    return;
  }

  Status = PeiServicesLocatePpi (
             &gEdkiiDebugPpiGuid,
             0,
             NULL,
             (VOID **)&DebugPpi
             );
  if (EFI_ERROR (Status)) {
    return;
  }

  DebugPpi->DebugBPrint (
              ErrorLevel,
              Format,
              BaseListMarker
              );
}

/**
  Worker function that convert a VA_LIST to a BASE_LIST based on a
  Null-terminated format string.

  @param  Format          Null-terminated format string.
  @param  VaListMarker    VA_LIST style variable argument list consumed
                          by processing Format.
  @param  BaseListMarker  BASE_LIST style variable argument list consumed
                          by processing Format.
  @param  Size            The size, in bytes, of the BaseListMarker buffer.

  @return TRUE   The VA_LIST has been converted to BASE_LIST.
  @return FALSE  The VA_LIST has not been converted to BASE_LIST.

**/
BOOLEAN
VaListToBaseList (
  IN  CONST CHAR8  *Format,
  IN  VA_LIST      VaListMarker,
  OUT BASE_LIST    BaseListMarker,
  IN  UINTN        Size
  )
{
  BASE_LIST  BaseListStart;
  BOOLEAN    Long;

  ASSERT (Format != NULL);

  ASSERT (BaseListMarker != NULL);

  BaseListStart = BaseListMarker;

  for ( ; *Format != '\0'; Format++) {
    //
    // Only format with prefix % is processed.
    //
    if (*Format != '%') {
      continue;
    }

    Long = FALSE;

    //
    // Parse Flags and Width
    //
    for (Format++; TRUE; Format++) {
      if ((*Format == '.') || (*Format == '-') || (*Format == '+') || (*Format == ' ')) {
        //
        // These characters in format field are omitted.
        //
        continue;
      }

      if ((*Format >= '0') && (*Format <= '9')) {
        //
        // These characters in format field are omitted.
        //
        continue;
      }

      if ((*Format == 'L') || (*Format == 'l')) {
        //
        // 'L" or "l" in format field means the number being printed is a UINT64
        //
        Long = TRUE;
        continue;
      }

      if (*Format == '*') {
        //
        // '*' in format field means the precision of the field is specified by
        // a UINTN argument in the argument list.
        //
        BASE_ARG (BaseListMarker, UINTN) = VA_ARG (VaListMarker, UINTN);
        continue;
      }

      if (*Format == '\0') {
        //
        // Make no output if Format string terminates unexpectedly when
        // looking up for flag, width, precision and type.
        //
        Format--;
      }

      //
      // When valid argument type detected or format string terminates unexpectedly,
      // the inner loop is done.
      //
      break;
    }

    //
    // Pack variable arguments into the storage area following EFI_DEBUG_INFO.
    //
    if ((*Format == 'p') && (sizeof (VOID *) > 4)) {
      Long = TRUE;
    }

    if ((*Format == 'p') || (*Format == 'X') || (*Format == 'x') || (*Format == 'd') || (*Format == 'u')) {
      if (Long) {
        BASE_ARG (BaseListMarker, INT64) = VA_ARG (VaListMarker, INT64);
      } else {
        BASE_ARG (BaseListMarker, int) = VA_ARG (VaListMarker, int);
      }
    } else if ((*Format == 's') || (*Format == 'S') || (*Format == 'a') || (*Format == 'g') || (*Format == 't')) {
      BASE_ARG (BaseListMarker, VOID *) = VA_ARG (VaListMarker, VOID *);
    } else if (*Format == 'c') {
      BASE_ARG (BaseListMarker, UINTN) = VA_ARG (VaListMarker, UINTN);
    } else if (*Format == 'r') {
      BASE_ARG (BaseListMarker, RETURN_STATUS) = VA_ARG (VaListMarker, RETURN_STATUS);
    }

    //
    // If the converted BASE_LIST is larger than the size of BaseListMarker, then return FALSE
    //
    if (((UINTN)BaseListMarker - (UINTN)BaseListStart) > Size) {
      return FALSE;
    }
  }

  return TRUE;
}

/**
  Prints a debug message to the debug output device if the specified
  error level is enabled.

  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
  GetDebugPrintErrorLevel (), then print the message specified by Format and
  the associated variable argument list to the debug output device.

  If Format is NULL, then ASSERT().

  @param  ErrorLevel    The error level of the debug message.
  @param  Format        Format string for the debug message to print.
  @param  VaListMarker  VA_LIST marker for the variable argument list.

**/
VOID
EFIAPI
DebugVPrint (
  IN  UINTN        ErrorLevel,
  IN  CONST CHAR8  *Format,
  IN  VA_LIST      VaListMarker
  )
{
  UINT64   BaseListMarker[256 / sizeof (UINT64)];
  BOOLEAN  Converted;

  //
  // Convert the VaList to BaseList
  //
  Converted = VaListToBaseList (
                Format,
                VaListMarker,
                (BASE_LIST)BaseListMarker,
                sizeof (BaseListMarker) - 8
                );

  if (!Converted) {
    return;
  }

  DebugBPrint (ErrorLevel, Format, (BASE_LIST)BaseListMarker);
}

/**
  Prints an assert message containing a filename, line number, and description.
  This may be followed by a breakpoint or a dead loop.

  Print a message of the form "ASSERT <FileName>(<LineNumber>): <Description>\n"
  to the debug output device.  If DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED bit of
  PcdDebugProperyMask is set then CpuBreakpoint() is called. Otherwise, if
  DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED bit of PcdDebugProperyMask is set then
  CpuDeadLoop() is called.  If neither of these bits are set, then this function
  returns immediately after the message is printed to the debug output device.
  DebugAssert() must actively prevent recursion.  If DebugAssert() is called while
  processing another DebugAssert(), then DebugAssert() must return immediately.

  If FileName is NULL, then a <FileName> string of "(NULL) Filename" is printed.
  If Description is NULL, then a <Description> string of "(NULL) Description" is printed.

  @param  FileName     The pointer to the name of the source file that generated the assert condition.
  @param  LineNumber   The line number in the source file that generated the assert condition
  @param  Description  The pointer to the description of the assert condition.

**/
VOID
EFIAPI
DebugAssert (
  IN CONST CHAR8  *FileName,
  IN UINTN        LineNumber,
  IN CONST CHAR8  *Description
  )
{
  EFI_STATUS       Status;
  EDKII_DEBUG_PPI  *DebugPpi;

  Status = PeiServicesLocatePpi (
             &gEdkiiDebugPpiGuid,
             0,
             NULL,
             (VOID **)&DebugPpi
             );
  if (EFI_ERROR (Status)) {
    //
    // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings
    //
    if ((PcdGet8 (PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {
      CpuBreakpoint ();
    } else if ((PcdGet8 (PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {
      CpuDeadLoop ();
    }
  } else {
    DebugPpi->DebugAssert (
                FileName,
                LineNumber,
                Description
                );
  }
}

/**
  Fills a target buffer with PcdDebugClearMemoryValue, and returns the target buffer.

  This function fills Length bytes of Buffer with the value specified by
  PcdDebugClearMemoryValue, and returns Buffer.

  If Buffer is NULL, then ASSERT().
  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().

  @param   Buffer  The pointer to the target buffer to be filled with PcdDebugClearMemoryValue.
  @param   Length  The number of bytes in Buffer to fill with zeros PcdDebugClearMemoryValue.

  @return  Buffer  The pointer to the target buffer filled with PcdDebugClearMemoryValue.

**/
VOID *
EFIAPI
DebugClearMemory (
  OUT VOID  *Buffer,
  IN UINTN  Length
  )
{
  ASSERT (Buffer != NULL);

  return SetMem (Buffer, Length, PcdGet8 (PcdDebugClearMemoryValue));
}

/**
  Returns TRUE if ASSERT() macros are enabled.

  This function returns TRUE if the DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of
  PcdDebugProperyMask is set.  Otherwise, FALSE is returned.

  @retval  TRUE    The DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of PcdDebugProperyMask is set.
  @retval  FALSE   The DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of PcdDebugProperyMask is clear.

**/
BOOLEAN
EFIAPI
DebugAssertEnabled (
  VOID
  )
{
  return (BOOLEAN)((PcdGet8 (PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED) != 0);
}

/**
  Returns TRUE if DEBUG() macros are enabled.

  This function returns TRUE if the DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of
  PcdDebugProperyMask is set.  Otherwise, FALSE is returned.

  @retval  TRUE    The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is set.
  @retval  FALSE   The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is clear.

**/
BOOLEAN
EFIAPI
DebugPrintEnabled (
  VOID
  )
{
  return (BOOLEAN)((PcdGet8 (PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_PRINT_ENABLED) != 0);
}

/**
  Returns TRUE if DEBUG_CODE() macros are enabled.

  This function returns TRUE if the DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of
  PcdDebugProperyMask is set.  Otherwise, FALSE is returned.

  @retval  TRUE    The DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of PcdDebugProperyMask is set.
  @retval  FALSE   The DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of PcdDebugProperyMask is clear.

**/
BOOLEAN
EFIAPI
DebugCodeEnabled (
  VOID
  )
{
  return (BOOLEAN)((PcdGet8 (PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_CODE_ENABLED) != 0);
}

/**
  Returns TRUE if DEBUG_CLEAR_MEMORY() macro is enabled.

  This function returns TRUE if the DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of
  PcdDebugProperyMask is set.  Otherwise, FALSE is returned.

  @retval  TRUE    The DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of PcdDebugProperyMask is set.
  @retval  FALSE   The DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of PcdDebugProperyMask is clear.

**/
BOOLEAN
EFIAPI
DebugClearMemoryEnabled (
  VOID
  )
{
  return (BOOLEAN)((PcdGet8 (PcdDebugPropertyMask) & DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED) != 0);
}

/**
  Returns TRUE if any one of the bit is set both in ErrorLevel and PcdFixedDebugPrintErrorLevel.

  This function compares the bit mask of ErrorLevel and PcdFixedDebugPrintErrorLevel.

  @retval  TRUE    Current ErrorLevel is supported.
  @retval  FALSE   Current ErrorLevel is not supported.

**/
BOOLEAN
EFIAPI
DebugPrintLevelEnabled (
  IN  CONST UINTN  ErrorLevel
  )
{
  return (BOOLEAN)((ErrorLevel & PcdGet32 (PcdFixedDebugPrintErrorLevel)) != 0);
}