include/ldt.h

   1 /*
   2  * LDT copy
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #ifndef _WINE_LDT_H
   8 #define _WINE_LDT_H
   9
  10 enum seg_type
  11 {
  12     SEGMENT_DATA  = 0,
  13     SEGMENT_STACK = 1,
  14     SEGMENT_CODE  = 2
  15 };
  16
  17   /* This structure represents a real LDT entry.        */
  18   /* It is used by get_ldt_entry() and set_ldt_entry(). */
  19 typedef struct
  20 {
  21     unsigned long base;            /* base address */
  22     unsigned long limit;           /* segment limit (in pages or bytes) */
  23     int           seg_32bit;       /* is segment 32-bit? */
  24     int           read_only;       /* is segment read-only? */
  25     int           limit_in_pages;  /* is the limit in pages or bytes? */
  26     enum seg_type type;            /* segment type */
  27 } ldt_entry;
  28
  29 extern void LDT_BytesToEntry( const unsigned long *buffer, ldt_entry *content);
  30 extern void LDT_EntryToBytes( unsigned long *buffer, const ldt_entry *content);
  31 extern int LDT_GetEntry( int entry, ldt_entry *content );
  32 extern int LDT_SetEntry( int entry, const ldt_entry *content );
  33 extern void LDT_Print( int start, int length );
  34
  35
  36   /* This structure is used to build the local copy of the LDT. */
  37 typedef struct
  38 {
  39     unsigned long base;    /* base address or 0 if entry is free   */
  40     unsigned long limit;   /* limit in bytes or 0 if entry is free */
  41 } ldt_copy_entry;
  42
  43 #define LDT_SIZE  8192
  44
  45 extern ldt_copy_entry ldt_copy[LDT_SIZE];
  46
  47 #define __AHSHIFT  3  /* don't change! */
  48 #define __AHINCR   (1 << __AHSHIFT)
  49
  50 #define SELECTOR_TO_ENTRY(sel)  (((int)(sel) & 0xffff) >> __AHSHIFT)
  51 #define ENTRY_TO_SELECTOR(i)    ((i) ? (((int)(i) << __AHSHIFT) | 7) : 0)
  52 #define IS_LDT_ENTRY_FREE(i)    (!(ldt_flags_copy[(i)] & LDT_FLAGS_ALLOCATED))
  53 #define IS_SELECTOR_FREE(sel)   (IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)))
  54 #define GET_SEL_BASE(sel)       (ldt_copy[SELECTOR_TO_ENTRY(sel)].base)
  55 #define GET_SEL_LIMIT(sel)      (ldt_copy[SELECTOR_TO_ENTRY(sel)].limit)
  56
  57 #define PTR_SEG_OFF_TO_LIN(seg,off) \
  58            ((void*)(GET_SEL_BASE(seg) + (unsigned int)(off)))
  59
  60 #ifndef WINELIB
  61   /* Convert a segmented ptr (16:16) to a linear (32) pointer */
  62 #define PTR_SEG_TO_LIN(ptr) PTR_SEG_OFF_TO_LIN(SELECTOROF(ptr),OFFSETOF(ptr))
  63 #define PTR_SEG_OFF_TO_SEGPTR(seg,off) ((SEGPTR)MAKELONG(off,seg))
  64 #else
  65 #define PTR_SEG_TO_LIN(ptr)     ((void*)(ptr))
  66 #define PTR_SEG_OFF_TO_SEGPTR(seg,off) ((SEGPTR)PTR_SEG_OFF_TO_LIN(seg,off))
  67 #endif
  68
  69 extern unsigned char ldt_flags_copy[LDT_SIZE];
  70
  71 #define LDT_FLAGS_TYPE      0x03  /* Mask for segment type */
  72 #define LDT_FLAGS_READONLY  0x04  /* Segment is read-only (data) */
  73 #define LDT_FLAGS_EXECONLY  0x04  /* Segment is execute-only (code) */
  74 #define LDT_FLAGS_32BIT     0x08  /* Segment is 32-bit (code or stack) */
  75 #define LDT_FLAGS_BIG       0x10  /* Segment is big (limit is in pages) */
  76 #define LDT_FLAGS_ALLOCATED 0x80  /* Segment is allocated (no longer free) */
  77
  78 #define GET_SEL_FLAGS(sel)   (ldt_flags_copy[SELECTOR_TO_ENTRY(sel)])
  79
  80 #endif  /* _WINE_LDT_H */