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 /*****************************************************************************/
55 /*****************************************************************************/
57 /*****************************************************************************/
61 static const char* GetModule (const char* Name)
62 /* Get a module name from the file name */
64 /* Make a module name from the file name */
65 const char* Module = Name + strlen (Name);
66 while (Module > Name) {
68 if (*Module == '/' || *Module == '\\') {
74 Error ("Cannot make module name from `%s'", Name);
81 static void ObjReadHeader (FILE* Obj, ObjHeader* H, const char* Name)
82 /* Read the header of the object file checking the signature */
84 H->Version = Read16 (Obj);
85 if (H->Version != OBJ_VERSION) {
86 Error ("Object file `%s' has wrong version", Name);
88 H->Flags = Read16 (Obj);
89 H->OptionOffs = Read32 (Obj);
90 H->OptionSize = Read32 (Obj);
91 H->FileOffs = Read32 (Obj);
92 H->FileSize = Read32 (Obj);
93 H->SegOffs = Read32 (Obj);
94 H->SegSize = Read32 (Obj);
95 H->ImportOffs = Read32 (Obj);
96 H->ImportSize = Read32 (Obj);
97 H->ExportOffs = Read32 (Obj);
98 H->ExportSize = Read32 (Obj);
99 H->DbgSymOffs = Read32 (Obj);
100 H->DbgSymSize = Read32 (Obj);
105 void ObjReadFiles (FILE* F, ObjData* O)
106 /* Read the files list from a file at the current position */
110 O->FileCount = ReadVar (F);
111 O->Files = xmalloc (O->FileCount * sizeof (char*));
112 for (I = 0; I < O->FileCount; ++I) {
113 /* Skip MTime and size */
116 /* Read the filename */
117 O->Files [I] = ReadStr (F);
123 void ObjReadImports (FILE* F, ObjData* O)
124 /* Read the imports from a file at the current position */
128 O->ImportCount = ReadVar (F);
129 O->Imports = xmalloc (O->ImportCount * sizeof (Import*));
130 for (I = 0; I < O->ImportCount; ++I) {
131 O->Imports [I] = ReadImport (F, O);
132 InsertImport (O->Imports [I]);
138 void ObjReadExports (FILE* F, ObjData* O)
139 /* Read the exports from a file at the current position */
143 O->ExportCount = ReadVar (F);
144 O->Exports = xmalloc (O->ExportCount * sizeof (Export*));
145 for (I = 0; I < O->ExportCount; ++I) {
146 O->Exports [I] = ReadExport (F, O);
147 InsertExport (O->Exports [I]);
153 void ObjReadDbgSyms (FILE* F, ObjData* O)
154 /* Read the debug symbols from a file at the current position */
158 O->DbgSymCount = ReadVar (F);
159 O->DbgSyms = xmalloc (O->DbgSymCount * sizeof (DbgSym*));
160 for (I = 0; I < O->DbgSymCount; ++I) {
161 O->DbgSyms [I] = ReadDbgSym (F, O);
167 void ObjReadSections (FILE* F, ObjData* O)
168 /* Read the section data from a file at the current position */
172 O->SectionCount = ReadVar (F);
173 O->Sections = xmalloc (O->SectionCount * sizeof (Section*));
174 for (I = 0; I < O->SectionCount; ++I) {
175 O->Sections [I] = ReadSection (F, O);
181 void ObjAdd (FILE* Obj, const char* Name)
182 /* Add an object file to the module list */
184 /* Create a new structure for the object file data */
185 ObjData* O = NewObjData ();
187 /* The magic was already read and checked, so set it in the header */
188 O->Header.Magic = OBJ_MAGIC;
190 /* Read and check the header */
191 ObjReadHeader (Obj, &O->Header, Name);
193 /* Initialize the object module data structure */
194 O->Name = xstrdup (GetModule (Name));
195 O->Flags = OBJ_HAVEDATA;
197 /* Read the files list from the object file */
198 fseek (Obj, O->Header.FileOffs, SEEK_SET);
199 ObjReadFiles (Obj, O);
201 /* Read the imports list from the object file */
202 fseek (Obj, O->Header.ImportOffs, SEEK_SET);
203 ObjReadImports (Obj, O);
205 /* Read the object file exports and insert them into the exports list */
206 fseek (Obj, O->Header.ExportOffs, SEEK_SET);
207 ObjReadExports (Obj, O);
209 /* Read the object debug symbols from the object file */
210 fseek (Obj, O->Header.DbgSymOffs, SEEK_SET);
211 ObjReadDbgSyms (Obj, O);
213 /* Read the segment list from the object file. This must be last, since
214 * the expressions stored in the code may reference segments or imported
217 fseek (Obj, O->Header.SegOffs, SEEK_SET);
218 ObjReadSections (Obj, O);
220 /* Mark this object file as needed */
221 O->Flags |= OBJ_REF | OBJ_HAVEDATA;
223 /* Done, close the file (we read it only, so no error check) */