git.sur5r.net Git - cc65/blob - src/ld65/segments.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                segments.h                                 */
   4 /*                                                                           */
   5 /*                   Segment handling for the ld65 linker                    */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998-2000 Ullrich von Bassewitz                                       */
  10 /*               Wacholderweg 14                                             */
  11 /*               D-70597 Stuttgart                                           */
  12 /* EMail:        uz@musoftware.de                                            */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #ifndef SEGMENTS_H
  37 #define SEGMENTS_H
  38
  39
  40
  41 #include <stdio.h>
  42
  43 /* common */
  44 #include "exprdefs.h"
  45
  46
  47
  48 /*****************************************************************************/
  49 /*                                   Data                                    */
  50 /*****************************************************************************/
  51
  52
  53
  54 /* Segment structure */
  55 typedef struct Segment Segment;
  56 struct Segment {
  57     Segment*            Next;           /* Hash list */
  58     Segment*            List;           /* List of all segments */
  59     struct Section*     SecRoot;        /* Section list */
  60     struct Section*     SecLast;        /* Pointer to last section */
  61     unsigned long       PC;             /* PC were this segment is located */
  62     unsigned long       Size;           /* Size of data so far */
  63     struct ObjData*     AlignObj;       /* Module that requested the alignment */
  64     unsigned char       Align;          /* Alignment needed */
  65     unsigned char       FillVal;        /* Value to use for fill bytes */
  66     unsigned char       Type;           /* Type of segment */
  67     char                Dumped;         /* Did we dump this segment? */
  68     char                Name [1];       /* Name, dynamically allocated */
  69 };
  70
  71
  72
  73 /* Section structure (a section is a part of a segment) */
  74 typedef struct Section Section;
  75 struct Section {
  76     Section*            Next;           /* List of sections in a segment */
  77     Segment*            Seg;            /* Segment that contains the section */
  78     struct Fragment*    FragRoot;       /* Fragment list */
  79     struct Fragment*    FragLast;       /* Pointer to last fragment */
  80     unsigned long       Offs;           /* Offset into the segment */
  81     unsigned long       Size;           /* Size of the section */
  82     unsigned char       Align;          /* Alignment */
  83     unsigned char       Fill;           /* Fill bytes for alignment */
  84     unsigned char       Type;           /* Type of segment */
  85 };
  86
  87
  88
  89 /* Prototype for a function that is used to write expressions to the target
  90  * file (used in SegWrite). It returns one of the following values:
  91  */
  92 #define SEG_EXPR_OK             0       /* Ok */
  93 #define SEG_EXPR_RANGE_ERROR    1       /* Range error */
  94 #define SEG_EXPR_TOO_COMPLEX    2       /* Expression too complex */
  95
  96 typedef unsigned (*SegWriteFunc) (ExprNode* E,        /* The expression to write */
  97                                   int Signed,         /* Signed expression? */
  98                                   unsigned Size,      /* Size (=range) */
  99                                   unsigned long Offs, /* File offset */
 100                                   void* Data);        /* Callers data */
 101
 102
 103
 104 /*****************************************************************************/
 105 /*                                   Code                                    */
 106 /*****************************************************************************/
 107
 108
 109
 110 Section* ReadSection (FILE* F, struct ObjData* O);
 111 /* Read a section from a file */
 112
 113 Segment* SegFind (const char* Name);
 114 /* Return the given segment or NULL if not found. */
 115
 116 int IsBSSType (Segment* S);
 117 /* Check if the given segment is a BSS style segment, that is, it does not
 118  * contain non-zero data.
 119  */
 120
 121 void SegDump (void);
 122 /* Dump the segments and it's contents */
 123
 124 unsigned SegWriteConstExpr (FILE* F, ExprNode* E, int Signed, unsigned Size);
 125 /* Write a supposedly constant expression to the target file. Do a range
 126  * check and return one of the SEG_EXPR_xxx codes.
 127  */
 128
 129 void SegWrite (FILE* Tgt, Segment* S, SegWriteFunc F, void* Data);
 130 /* Write the data from the given segment to a file. For expressions, F is
 131  * called (see description of SegWriteFunc above).
 132  */
 133
 134 void PrintSegmentMap (FILE* F);
 135 /* Print a segment map to the given file */
 136
 137 void CheckSegments (void);
 138 /* Walk through the segment list and check if there are segments that were
 139  * not written to the output file. Output an error if this is the case.
 140  */
 141
 142
 143
 144 /* End of segments.h */
 145
 146 #endif
 147
 148
 149
 150