1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
|
{
Copyright (C) 1995 Charles Sandmann (sandmann@clio.rice.edu)
This software may be freely distributed with above copyright, no warranty.
Based on code by DJ Delorie, it's really his, enhanced, bugs fixed.
DXEGEN converts COFF object files to .DXE files that can be loaded and
relocated runtime. See (1.0.6+) manual for more details.
Pascal translation, improvements, enhancements
(C) 2001 by Marco van de Voort (Free Pascal member).
}
Uses strings,dxetype,coff,dos;
{$inline on}
Const
DirSep = System.DirectorySeparator;
Tempname= 'dxe__tmp.o';
{ This next function is needed for cross-compiling when the machine
isn't little-endian like the i386 }
Type csize_t = cardinal;
Procedure dosswap(vdata:pointer;Const pattern:String);
{ interpretive way of changing structures to bigendian.
Pattern contains the structures. l (32-bit) and s (16-bit) will be swapped,
a char between 1 and 9 skips that much bytes)
Excellent candidate to be converted to something generic that inlines and
isn't interpretive. Until generics, this is the only reusable way.
}
{$ifdef FPC_BIG_ENDIAN}
Var data : pbyte;
c : byte;
i,j : longint;
{$endif FPC_BIG_ENDIAN}
Begin
{$ifdef FPC_BIG_ENDIAN}
I := 1;
j := length(pattern);
data := pbyte(vdata);
while I< = j Do
Begin
Case Pattern[i] Of
'1'..'9' : inc(data,ord(pattern[i])-ord('0'));
's' :
Begin
c := data[1];
data[1] := data[0];
data[0] := c;
inc(data,2);
End;
'l' :
Begin
c := data[3];
data[3] := data[0];
data[0] := c;
c := data[1];
data[1] := data[2];
data[2] := c;
inc(data,4);
// bswap (Data) ?
End
Else
inc(data);
End;
inc(i);
End;
{$endif FPC_BIG_ENDIAN}
End;
Var blaat : pointer;
Procedure exit_cleanup;
Var f: file;
Begin
assign(f,tempname);
{$I-}
erase(f);
{$I+}
exitproc := blaat;
End;
Var
Errors : Longint;
Bss_start : Cardinal; {type "unsigned" ?}
fh : FILHDR;
Input_f,
Output_F : file;
Sc : SCNHDR;
Data,
Strngs : PChar; {strings is not reserved, but not wise to use in C translations}
Sym : ^SYMENT;
Relocs : pRELOC;
Strsz : Longint;
I : csize_t;
Dh : dxe_header;
Command,
Param,
Libdir : ansistring;
Name : pchar;
Tmp : array[0..8] Of char;
Written : Word;
Function fixrelocs(i:longint): preloc; {$ifdef HASINLINE}inline;{$endif}
Begin
fixrelocs := preloc(longint(relocs)+i*SIZEOF(reloc));
End;
Begin
Errors := 0;
Bss_start := 0;
If paramcount<3 Then
Begin
Writeln('Usage: dxegen output.dxe symbol input.o [input2.o ... -lgcc -lc]');
Halt(1);
End;
Assign (input_f,paramstr(3));
Filemode := 0;
{$I-}
Reset(input_f,1);
{$I+}
If IOResult<>0 Then
Begin
Writeln('File: ',ParamStr(3),' couldn''t be opened');
halt(1);
End;
{Read the COFF .O fileheader}
Blockread(input_f,fh,FILHSZ);
dosswap(@fh,'sslllss');
If (fh.f_nscns <>1) And (paramcount>3) Then
Begin
Close(input_f);
{$ifdef DXE_LD}
command := DXE_LD;
{$else}
command := 'ld';
{$endif}
param := '-X -S -r -o '+tempname+' -L';
libdir := getenv('DXE_LD_LIBRARY_PATH');
If libdir<>'' Then
param := param+libdir
Else
Begin
libdir := getenv('DJDIR'); {FPCDIR ?}
If libdir='' Then
Begin
Writeln('Error: neither DXE_LD_LIBRARY_PATH nor DJDIR are set in environment');
Halt(1);
End;
param := param+libdir+dirsep+'lib';
End;
For i:= 3 To ParamCount Do
param := param+' '+paramstr(i);
param := param+' -T dxe.ld ';
Writeln('Executing: "',Command,' ',param,'"');
Exec(Command,Param);
Errors := DosExitCode;
If Errors<>0 Then
Begin
Writeln('Dos returned errorcode: ',Errors);
Halt(Errors);
End;
Assign(input_f,tempname);
FileMode := 0;
{$I-}
Reset(Input_f,1);
{$I+}
If IOresult<>0 Then
Begin
Close(input_f);
Writeln('couldn''t open file: '+tempname);
halt(1);
End
Else
Begin
blaat := exitproc;
exitproc := @exit_cleanup;
End;
blockread(input_f,fh,FILHSZ);
dosswap(@fh, 'sslllss');
If (fh.f_nscns <>1) Then
Begin
Close(input_f);
Writeln('Error: input file has more than one section; use -M for map');
halt(1);
End;
End;
seek(input_f,FilePos(Input_f)+fh.f_opthdr);
BlockRead(input_f,sc,SCNHSZ);
dosswap(@sc, '8llllllssl');
dh.magic := DXE_MAGIC;
dh.symbol_offset := cardinal (-1);
dh.element_size := sc.s_size;
dh.nrelocs := sc.s_nreloc;
Getmem(Data,sc.s_size);
Seek(input_f,sc.s_scnptr);
BlockRead(input_f,data^, sc.s_size);
Getmem(sym,sizeof(SYMENT)*fh.f_nsyms);
Seek(input_f,fh.f_symptr);
Blockread(input_f,sym^,fh.f_nsyms*SYMESZ);
Blockread(input_f,strsz,4);
Dosswap(@strsz,'l');
Getmem(Strngs,strsz);
Blockread(input_f,strngs[4],strsz-4);
plongint(strsz)[0] := 0; // {?}
I := 0;
while I < fh.f_nsyms do
Begin
If (sym[i].e.e.e_zeroes<>0) Then
Begin
dosswap(@sym[i], '8lscc');
move(sym[i].e.e_name,tmp,8);
tmp[8] := #0;
name := @tmp;
End
Else
Begin
dosswap(@sym[i], 'lllscc');
name := strngs + sym[i].e.e.e_offset;
End;
If (sym[i].e_scnum = 0) Then
Begin
Writeln('Error: object contains unresolved external symbols (', name,')');
inc(errors);
End;
If (strlcomp(name, argv[2], strlen(argv[2])) = 0) Then
Begin
If (dh.symbol_offset <> cardinal (-1)) Then
Begin
Writeln('Error: multiple symbols that start with ',paramstr(2),' (',name,
')!');
Inc(errors);
End;
dh.symbol_offset := sym[i].e_value;
End
Else If (strcomp(name, '.bss') = 0) And (bss_start=0) Then
Begin
bss_start := sym[i].e_value;
Fillchar(data[bss_start], sc.s_size - bss_start,#0);
End;
Inc (I, Succ (sym[i].e_numaux)); (* Original C for loop iteration *)
(* plus increment for found value. *)
End;
If (dh.symbol_offset = cardinal (-1)) Then
Begin
Writeln('Error: symbol ',argv[2],' not found!');
Inc(Errors);
End;
Getmem(Relocs,sizeof(RELOC)*sc.s_nreloc);
seek(input_f, sc.s_relptr);
Blockread (input_f,relocs^,sc.s_nreloc*RELSZ);;
Close(input_f);
If errors>0 Then
Begin
Writeln(' Errors: ',Errors);
Halt(Errors);
End;
Assign(Output_F,argv[1]);
{$I-}
Rewrite(output_f,1);
{$I+}
If Ioresult<>0 Then
Begin
Writeln('can''t write file ',argv[1]);
Halt(1);
End;
If sc.s_nreloc<>0 Then
For I:=0 To sc.s_nreloc-1 Do
Begin
If (fixrelocs(i)^.r_type And 255)=$14 Then
Dec(dh.nrelocs); { Don't do these, they are relative }
End;
Dosswap(@dh,'llll');
Dosswap(@dh, 'llll');
BlockWrite(output_f,dh,sizeof(dh));
Blockwrite(output_f,data^,sc.s_size,I);
If sc.s_nreloc<>0 Then
For I:=0 To sc.s_nreloc-1 Do
Begin
If (fixrelocs(i)^.r_type And 255)<>$14 Then
blockwrite(output_f,fixrelocs(i)^.r_vaddr , 4,written);
End;
Close(output_f);
End.
|