MdePkg/Library/UefiDebugLibStdErr/DebugLib.c

   1 /** @file
   2   UEFI Debug Lib that sends messages to the Standard Error Device in the EFI System Table.
   3
   4   Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16 #include <Uefi.h>
  17
  18 #include <Library/DebugLib.h>
  19 #include <Library/UefiBootServicesTableLib.h>
  20 #include <Library/PrintLib.h>
  21 #include <Library/PcdLib.h>
  22 #include <Library/BaseLib.h>
  23 #include <Library/BaseMemoryLib.h>
  24 #include <Library/DebugPrintErrorLevelLib.h>
  25
  26 //
  27 // Define the maximum debug and assert message length that this library supports
  28 //
  29 #define MAX_DEBUG_MESSAGE_LENGTH  0x100
  30
  31
  32 /**
  33   Prints a debug message to the debug output device if the specified error level is enabled.
  34
  35   If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
  36   GetDebugPrintErrorLevel (), then print the message specified by Format and the
  37   associated variable argument list to the debug output device.
  38
  39   If Format is NULL, then ASSERT().
  40
  41   @param  ErrorLevel  The error level of the debug message.
  42   @param  Format      The format string for the debug message to print.
  43   @param  ...         The variable argument list whose contents are accessed
  44                       based on the format string specified by Format.
  45
  46 **/
  47 VOID
  48 EFIAPI
  49 DebugPrint (
  50   IN  UINTN        ErrorLevel,
  51   IN  CONST CHAR8  *Format,
  52   ...
  53   )
  54 {
  55   CHAR16   Buffer[MAX_DEBUG_MESSAGE_LENGTH];
  56   VA_LIST  Marker;
  57
  58   //
  59   // If Format is NULL, then ASSERT().
  60   //
  61   ASSERT (Format != NULL);
  62
  63   //
  64   // Check driver debug mask value and global mask
  65   //
  66   if ((ErrorLevel & GetDebugPrintErrorLevel ()) == 0) {
  67     return;
  68   }
  69
  70   //
  71   // Convert the DEBUG() message to a Unicode String
  72   //
  73   VA_START (Marker, Format);
  74   UnicodeVSPrintAsciiFormat (Buffer, MAX_DEBUG_MESSAGE_LENGTH, Format, Marker);
  75   VA_END (Marker);
  76
  77   //
  78   // Send the print string to the Standard Error device
  79   //
  80   if ((gST != NULL) && (gST->StdErr != NULL)) {
  81     gST->StdErr->OutputString (gST->StdErr, Buffer);
  82   }
  83 }
  84
  85
  86 /**
  87   Prints an assert message containing a filename, line number, and description.
  88   This may be followed by a breakpoint or a dead loop.
  89
  90   Print a message of the form "ASSERT <FileName>(<LineNumber>): <Description>\n"
  91   to the debug output device.  If DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED bit of
  92   PcdDebugProperyMask is set then CpuBreakpoint() is called. Otherwise, if
  93   DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED bit of PcdDebugProperyMask is set then
  94   CpuDeadLoop() is called.  If neither of these bits are set, then this function
  95   returns immediately after the message is printed to the debug output device.
  96   DebugAssert() must actively prevent recursion.  If DebugAssert() is called while
  97   processing another DebugAssert(), then DebugAssert() must return immediately.
  98
  99   If FileName is NULL, then a <FileName> string of "(NULL) Filename" is printed.
 100   If Description is NULL, then a <Description> string of "(NULL) Description" is printed.
 101
 102   @param  FileName     The pointer to the name of the source file that generated
 103                        the assert condition.
 104   @param  LineNumber   The line number in the source file that generated the
 105                        assert condition
 106   @param  Description  The pointer to the description of the assert condition.
 107
 108 **/
 109 VOID
 110 EFIAPI
 111 DebugAssert (
 112   IN CONST CHAR8  *FileName,
 113   IN UINTN        LineNumber,
 114   IN CONST CHAR8  *Description
 115   )
 116 {
 117   CHAR16  Buffer[MAX_DEBUG_MESSAGE_LENGTH];
 118
 119   //
 120   // Generate the ASSERT() message in Unicode format
 121   //
 122   UnicodeSPrintAsciiFormat (
 123     Buffer,
 124     MAX_DEBUG_MESSAGE_LENGTH,
 125     "ASSERT %a(%d): %a\n",
 126     FileName,
 127     LineNumber,
 128     Description
 129     );
 130
 131   //
 132   // Send the print string to the Standard Error device
 133   //
 134   if ((gST != NULL) && (gST->StdErr != NULL)) {
 135     gST->StdErr->OutputString (gST->StdErr, Buffer);
 136   }
 137
 138   //
 139   // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings
 140   //
 141   if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {
 142     CpuBreakpoint ();
 143   } else if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {
 144     CpuDeadLoop ();
 145   }
 146 }
 147
 148
 149 /**
 150   Fills a target buffer with PcdDebugClearMemoryValue, and returns the target buffer.
 151
 152   This function fills Length bytes of Buffer with the value specified by
 153   PcdDebugClearMemoryValue, and returns Buffer.
 154
 155   If Buffer is NULL, then ASSERT().
 156   If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
 157
 158   @param   Buffer  The pointer to the target buffer to be filled with PcdDebugClearMemoryValue.
 159   @param   Length  The number of bytes in Buffer to fill with zeros PcdDebugClearMemoryValue.
 160
 161   @return  Buffer  The pointer to the target buffer filled with PcdDebugClearMemoryValue.
 162
 163 **/
 164 VOID *
 165 EFIAPI
 166 DebugClearMemory (
 167   OUT VOID  *Buffer,
 168   IN UINTN  Length
 169   )
 170 {
 171   //
 172   // If Buffer is NULL, then ASSERT().
 173   //
 174   ASSERT (Buffer != NULL);
 175
 176   //
 177   // SetMem() checks for the the ASSERT() condition on Length and returns Buffer
 178   //
 179   return SetMem (Buffer, Length, PcdGet8(PcdDebugClearMemoryValue));
 180 }
 181
 182
 183 /**
 184   Returns TRUE if ASSERT() macros are enabled.
 185
 186   This function returns TRUE if the DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of
 187   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 188
 189   @retval  TRUE    The DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of PcdDebugProperyMask is set.
 190   @retval  FALSE   The DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED bit of PcdDebugProperyMask is clear.
 191
 192 **/
 193 BOOLEAN
 194 EFIAPI
 195 DebugAssertEnabled (
 196   VOID
 197   )
 198 {
 199   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_ASSERT_ENABLED) != 0);
 200 }
 201
 202
 203 /**
 204   Returns TRUE if DEBUG() macros are enabled.
 205
 206   This function returns TRUE if the DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of
 207   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 208
 209   @retval  TRUE    The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is set.
 210   @retval  FALSE   The DEBUG_PROPERTY_DEBUG_PRINT_ENABLED bit of PcdDebugProperyMask is clear.
 211
 212 **/
 213 BOOLEAN
 214 EFIAPI
 215 DebugPrintEnabled (
 216   VOID
 217   )
 218 {
 219   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_PRINT_ENABLED) != 0);
 220 }
 221
 222
 223 /**
 224   Returns TRUE if DEBUG_CODE() macros are enabled.
 225
 226   This function returns TRUE if the DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of
 227   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 228
 229   @retval  TRUE    The DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of PcdDebugProperyMask is set.
 230   @retval  FALSE   The DEBUG_PROPERTY_DEBUG_CODE_ENABLED bit of PcdDebugProperyMask is clear.
 231
 232 **/
 233 BOOLEAN
 234 EFIAPI
 235 DebugCodeEnabled (
 236   VOID
 237   )
 238 {
 239   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_DEBUG_CODE_ENABLED) != 0);
 240 }
 241
 242
 243 /**
 244   Returns TRUE if DEBUG_CLEAR_MEMORY() macro is enabled.
 245
 246   This function returns TRUE if the DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of
 247   PcdDebugProperyMask is set.  Otherwise FALSE is returned.
 248
 249   @retval  TRUE    The DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of PcdDebugProperyMask is set.
 250   @retval  FALSE   The DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED bit of PcdDebugProperyMask is clear.
 251
 252 **/
 253 BOOLEAN
 254 EFIAPI
 255 DebugClearMemoryEnabled (
 256   VOID
 257   )
 258 {
 259   return (BOOLEAN) ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_CLEAR_MEMORY_ENABLED) != 0);
 260 }