subsystems/mvdm/dos/asmxtras.inc

   1 /*
   2  * PROJECT:     ReactOS Virtual DOS Machine
   3  * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
   4  * PURPOSE:     Extended ASM macros for GAS and MASM/ML64
   5  * COPYRIGHT:   Copyright 2015-2018 Hermes Belusca-Maito
   6  *
   7  * NOTE: This file is an extension to our well-known asm.inc that defines
   8  *       a set of macros allowing us to assemble specially-crafted ASM files
   9  *       with both GAS and MASM/ML.
  10  *
  11  *       The additions introduced here are:
  12  *       - a 'long' define for MASM/ML that aliases to DWORD, and a 'dword'
  13  *         and 'DWORD' defines for GAS that alias to long.
  14  *       - an OFF(...) macro that is used for initializing global symbols with
  15  *         the offset value of another symbol.
  16  *       - a set of macros for defining and using structures.
  17  */
  18
  19 #ifndef __ASMXTRAS_INC__
  20 #define __ASMXTRAS_INC__
  21
  22 /* 'long' / 'dword'|'DWORD' macros for MASM/ML and GAS */
  23 #ifdef _USE_ML
  24     #define long dword
  25 #else
  26     #define dword long
  27     #define DWORD long
  28 #endif
  29
  30 /* OFFset macro */
  31 #ifdef _USE_ML
  32     #define OFF(x) offset x
  33 #else
  34     #define OFF(x) x
  35 #endif
  36
  37 /*
  38  * Set of macros for defining and using structures:
  39  * - STRUCT(name, ...) defines a structure of name 'name'.
  40  * - FIELD_DECL(field, type, value) adds a new structure member 'field'
  41  *   of type 'type', with the default value 'value'.
  42  * - ENDS(name) terminates the definition of the structure 'name'.
  43  * - A symbol 'name' of type 'struct' is declared with VAR_STRUCT(name, struct).
  44  * - Referencing a member 'field' of a symbol 'name' is done with FIELD(name, field).
  45  */
  46 #ifdef _USE_ML
  47
  48 #define STRUCT(name, ...) \
  49     name STRUCT __VA_ARGS__
  50
  51 #define FIELD_DECL(field, type, value) \
  52     field   type   value
  53
  54 #define ENDS(name) \
  55     name ENDS
  56
  57 #define VAR_STRUCT(name, struct) \
  58     name struct <>
  59
  60 #define FIELD(name, field) \
  61     name##.##field
  62
  63 #else
  64
  65 #define STRUCT(name, ...) \
  66     MACRO(name, VarName)
  67
  68 #define FIELD_DECL(field, type, value) \
  69     VarName\()_\()field:   .type   value
  70
  71 #define ENDS(...) ENDM
  72
  73 #define VAR_STRUCT(name, struct) \
  74     name: struct name
  75
  76 #define FIELD(name, field) \
  77     name##_##field
  78
  79 #endif
  80
  81 #endif /* __ASMXTRAS_INC__ */