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 #include "wintypes.h"
  11
  12 enum seg_type
  13 {
  14     SEGMENT_DATA  = 0,
  15     SEGMENT_STACK = 1,
  16     SEGMENT_CODE  = 2
  17 };
  18
  19   /* This structure represents a real LDT entry.        */
  20   /* It is used by get_ldt_entry() and set_ldt_entry(). */
  21 typedef struct
  22 {
  23     unsigned long base;            /* base address */
  24     unsigned long limit;           /* segment limit (in pages or bytes) */
  25     int           seg_32bit;       /* is segment 32-bit? */
  26     int           read_only;       /* is segment read-only? */
  27     int           limit_in_pages;  /* is the limit in pages or bytes? */
  28     enum seg_type type;            /* segment type */
  29 } ldt_entry;
  30
  31 extern void LDT_BytesToEntry( const unsigned long *buffer, ldt_entry *content);
  32 extern void LDT_EntryToBytes( unsigned long *buffer, const ldt_entry *content);
  33 extern int LDT_GetEntry( int entry, ldt_entry *content );
  34 extern int LDT_SetEntry( int entry, const ldt_entry *content );
  35 extern void LDT_Print( int start, int length );
  36
  37
  38   /* This structure is used to build the local copy of the LDT. */
  39 typedef struct
  40 {
  41     unsigned long base;    /* base address or 0 if entry is free   */
  42     unsigned long limit;   /* limit in bytes or 0 if entry is free */
  43 } ldt_copy_entry;
  44
  45 #define LDT_SIZE  8192
  46
  47 extern ldt_copy_entry ldt_copy[LDT_SIZE];
  48
  49 #define __AHSHIFT  3  /* don't change! */
  50 #define __AHINCR   (1 << __AHSHIFT)
  51
  52 #define SELECTOR_TO_ENTRY(sel)  (((int)(sel) & 0xffff) >> __AHSHIFT)
  53 #define ENTRY_TO_SELECTOR(i)    ((i) ? (((int)(i) << __AHSHIFT) | 7) : 0)
  54 #define IS_LDT_ENTRY_FREE(i)    (!(ldt_flags_copy[(i)] & LDT_FLAGS_ALLOCATED))
  55 #define IS_SELECTOR_FREE(sel)   (IS_LDT_ENTRY_FREE(SELECTOR_TO_ENTRY(sel)))
  56 #define GET_SEL_BASE(sel)       (ldt_copy[SELECTOR_TO_ENTRY(sel)].base)
  57 #define GET_SEL_LIMIT(sel)      (ldt_copy[SELECTOR_TO_ENTRY(sel)].limit)
  58
  59 /* Convert a segmented ptr (16:16) to a linear (32) pointer */
  60
  61 #define PTR_SEG_OFF_TO_LIN(seg,off) \
  62    ((void*)(GET_SEL_BASE(seg) + (unsigned int)(off)))
  63 #define PTR_SEG_TO_LIN(ptr) \
  64    PTR_SEG_OFF_TO_LIN(SELECTOROF(ptr),OFFSETOF(ptr))
  65 #define PTR_SEG_OFF_TO_SEGPTR(seg,off) \
  66    ((SEGPTR)MAKELONG(off,seg))
  67 #define PTR_SEG_OFF_TO_HUGEPTR(seg,off) \
  68    PTR_SEG_OFF_TO_SEGPTR( (seg) + (HIWORD(off) << __AHSHIFT), LOWORD(off) )
  69
  70 extern unsigned char ldt_flags_copy[LDT_SIZE];
  71
  72 #define LDT_FLAGS_TYPE      0x03  /* Mask for segment type */
  73 #define LDT_FLAGS_READONLY  0x04  /* Segment is read-only (data) */
  74 #define LDT_FLAGS_EXECONLY  0x04  /* Segment is execute-only (code) */
  75 #define LDT_FLAGS_32BIT     0x08  /* Segment is 32-bit (code or stack) */
  76 #define LDT_FLAGS_BIG       0x10  /* Segment is big (limit is in pages) */
  77 #define LDT_FLAGS_ALLOCATED 0x80  /* Segment is allocated (no longer free) */
  78
  79 #define GET_SEL_FLAGS(sel)   (ldt_flags_copy[SELECTOR_TO_ENTRY(sel)])
  80
  81 #define FIRST_LDT_ENTRY_TO_ALLOC  17
  82
  83 /* Determine if sel is a system selector (i.e. not managed by Wine) */
  84 #define IS_SELECTOR_SYSTEM(sel) \
  85    (!((sel) & 4) || (SELECTOR_TO_ENTRY(sel) < FIRST_LDT_ENTRY_TO_ALLOC))
  86 #define IS_SELECTOR_32BIT(sel) \
  87    (IS_SELECTOR_SYSTEM(sel) || (GET_SEL_FLAGS(sel) & LDT_FLAGS_32BIT))
  88
  89 #endif  /* __WINE_LDT_H */