1 /*****************************************************************************/
5 /* Object file handling for the ld65 linker */
9 /* (C) 1998 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
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. */
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: */
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 */
32 /*****************************************************************************/
41 #include "../common/xmalloc.h"
53 /*****************************************************************************/
55 /*****************************************************************************/
59 static const char* GetModule (const char* Name)
60 /* Get a module name from the file name */
62 /* Make a module name from the file name */
63 const char* Module = Name + strlen (Name);
64 while (Module > Name) {
66 if (*Module == '/' || *Module == '\\') {
72 Error ("Cannot make module name from `%s'", Name);
79 static void ObjReadHeader (FILE* Obj, ObjHeader* H, const char* Name)
80 /* Read the header of the object file checking the signature */
82 H->Version = Read16 (Obj);
83 if (H->Version != OBJ_VERSION) {
84 Error ("Object file `%s' has wrong version", Name);
86 H->Flags = Read16 (Obj);
87 H->OptionOffs = Read32 (Obj);
88 H->OptionSize = Read32 (Obj);
89 H->FileOffs = Read32 (Obj);
90 H->FileSize = Read32 (Obj);
91 H->SegOffs = Read32 (Obj);
92 H->SegSize = Read32 (Obj);
93 H->ImportOffs = Read32 (Obj);
94 H->ImportSize = Read32 (Obj);
95 H->ExportOffs = Read32 (Obj);
96 H->ExportSize = Read32 (Obj);
97 H->DbgSymOffs = Read32 (Obj);
98 H->DbgSymSize = Read32 (Obj);
103 void ObjReadFiles (FILE* F, ObjData* O)
104 /* Read the files list from a file at the current position */
108 O->FileCount = Read8 (F);
109 O->Files = xmalloc (O->FileCount * sizeof (char*));
110 for (I = 0; I < O->FileCount; ++I) {
111 /* Skip MTime and size */
114 /* Read the filename */
115 O->Files [I] = ReadMallocedStr (F);
121 void ObjReadImports (FILE* F, ObjData* O)
122 /* Read the imports from a file at the current position */
126 O->ImportCount = Read16 (F);
127 O->Imports = xmalloc (O->ImportCount * sizeof (Import*));
128 for (I = 0; I < O->ImportCount; ++I) {
129 O->Imports [I] = ReadImport (F, O);
130 InsertImport (O->Imports [I]);
136 void ObjReadExports (FILE* F, ObjData* O)
137 /* Read the exports from a file at the current position */
141 O->ExportCount = Read16 (F);
142 O->Exports = xmalloc (O->ExportCount * sizeof (Export*));
143 for (I = 0; I < O->ExportCount; ++I) {
144 O->Exports [I] = ReadExport (F, O);
145 InsertExport (O->Exports [I]);
151 void ObjReadDbgSyms (FILE* F, ObjData* O)
152 /* Read the debug symbols from a file at the current position */
156 O->DbgSymCount = Read16 (F);
157 O->DbgSyms = xmalloc (O->DbgSymCount * sizeof (DbgSym*));
158 for (I = 0; I < O->DbgSymCount; ++I) {
159 O->DbgSyms [I] = ReadDbgSym (F, O);
165 void ObjReadSections (FILE* F, ObjData* O)
166 /* Read the section data from a file at the current position */
170 O->SectionCount = Read8 (F);
171 O->Sections = xmalloc (O->SectionCount * sizeof (Section*));
172 for (I = 0; I < O->SectionCount; ++I) {
173 O->Sections [I] = ReadSection (F, O);
179 void ObjAdd (FILE* Obj, const char* Name)
180 /* Add an object file to the module list */
182 /* Create a new structure for the object file data */
183 ObjData* O = NewObjData ();
185 /* The magic was already read and checked, so set it in the header */
186 O->Header.Magic = OBJ_MAGIC;
188 /* Read and check the header */
189 ObjReadHeader (Obj, &O->Header, Name);
191 /* Initialize the object module data structure */
192 O->Name = xstrdup (GetModule (Name));
193 O->Flags = OBJ_HAVEDATA;
195 /* Read the files list from the object file */
196 fseek (Obj, O->Header.FileOffs, SEEK_SET);
197 ObjReadFiles (Obj, O);
199 /* Read the imports list from the object file */
200 fseek (Obj, O->Header.ImportOffs, SEEK_SET);
201 ObjReadImports (Obj, O);
203 /* Read the object file exports and insert them into the exports list */
204 fseek (Obj, O->Header.ExportOffs, SEEK_SET);
205 ObjReadExports (Obj, O);
207 /* Read the object debug symbols from the object file */
208 fseek (Obj, O->Header.DbgSymOffs, SEEK_SET);
209 ObjReadDbgSyms (Obj, O);
211 /* Read the segment list from the object file. This must be last, since
212 * the expressions stored in the code may reference segments or imported
215 fseek (Obj, O->Header.SegOffs, SEEK_SET);
216 ObjReadSections (Obj, O);
218 /* Mark this object file as needed */
219 O->Flags |= OBJ_REF | OBJ_HAVEDATA;
221 /* Done, close the file (we read it only, so no error check) */