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61a153e5 RP |
1 | /* Another try at encapsulating bsd object files in coff. |
2 | Copyright (C) 1988, 1989, Free Software Foundation, Inc. | |
3 | Written by Pace Willisson 12/9/88 | |
4 | ||
5 | This file is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 1, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This file is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this file; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
18 | ||
19 | /* | |
20 | * This time, we will only use the coff headers to tell the kernel | |
21 | * how to exec the file. Therefore, the only fields that need to | |
22 | * be filled in are the scnptr and vaddr for the text and data | |
23 | * sections, and the vaddr for the bss. As far as coff is concerned, | |
24 | * there is no symbol table, relocation, or line numbers. | |
25 | * | |
26 | * A normal bsd header (struct exec) is placed after the coff headers, | |
27 | * and before the real text. I defined a the new fields 'a_machtype' | |
28 | * and a_flags. If a_machtype is M_386, and a_flags & A_ENCAP is | |
29 | * true, then the bsd header is preceeded by a coff header. Macros | |
30 | * like N_TXTOFF and N_TXTADDR use this field to find the bsd header. | |
31 | * | |
32 | * The only problem is to track down the bsd exec header. The | |
33 | * macros HEADER_OFFSET, etc do this. Look at nm.c, dis.c, etc | |
34 | * for examples. | |
35 | */ | |
36 | #ifndef A_OUT_ENCAP_H_SEEN | |
37 | #define A_OUT_ENCAP_H_SEEN | |
38 | ||
39 | #include "a.out.gnu.h" | |
40 | ||
41 | /* Figure out what our target machine is */ | |
42 | #include "target.h" | |
43 | ||
44 | #define N_FLAGS_COFF_ENCAPSULATE 0x20 /* coff header precedes bsd header */ | |
45 | ||
46 | /* Describe the COFF header used for encapsulation. */ | |
47 | ||
48 | struct coffheader | |
49 | { | |
50 | /* filehdr */ | |
51 | unsigned short f_magic; | |
52 | unsigned short f_nscns; | |
53 | long f_timdat; | |
54 | long f_symptr; | |
55 | long f_nsyms; | |
56 | unsigned short f_opthdr; | |
57 | unsigned short f_flags; | |
58 | /* aouthdr */ | |
59 | short magic; | |
60 | short vstamp; | |
61 | long tsize; | |
62 | long dsize; | |
63 | long bsize; | |
64 | long entry; | |
65 | long text_start; | |
66 | long data_start; | |
67 | struct coffscn | |
68 | { | |
69 | char s_name[8]; | |
70 | long s_paddr; | |
71 | long s_vaddr; | |
72 | long s_size; | |
73 | long s_scnptr; | |
74 | long s_relptr; | |
75 | long s_lnnoptr; | |
76 | unsigned short s_nreloc; | |
77 | unsigned short s_nlnno; | |
78 | long s_flags; | |
79 | } scns[3]; /* text, data, bss */ | |
80 | }; | |
81 | \f | |
82 | /* Describe some of the parameters of the encapsulation, | |
83 | including how to find the encapsulated BSD header. */ | |
84 | ||
85 | #if TARGET == TARGET_I386 | |
86 | #define COFF_MAGIC 0514 /* I386MAGIC */ | |
87 | #endif | |
88 | #if TARGET == TARGET_M68K | |
89 | #define COFF_MAGIC 0520 /* MC68MAGIC */ | |
90 | #endif | |
91 | #if TARGET == TARGET_SPARC | |
92 | #define COFF_MAGIC UNKNOWN!!! /* Used by TTI */ | |
93 | #endif | |
94 | #if TARGET == TARGET_AM29K | |
95 | #define COFF_MAGIC 0x17A /* Used by asm29k cross-tools */ | |
96 | #endif | |
97 | ||
98 | #ifdef COFF_MAGIC | |
99 | short __header_offset_temp; | |
100 | ||
101 | /* FIXME, this is dumb. The same tools can't handle a.outs for different | |
102 | architectures, just because COFF_MAGIC is different; so you need a | |
103 | separate GNU nm for every architecture!!? Also note that for | |
104 | expediency, this macros accepts COFF_MAGIC in either byte order. | |
105 | The right thing to do is to call read_aout_header to handle all this. */ | |
106 | ||
107 | #define HEADER_OFFSET(f) \ | |
108 | (__header_offset_temp = 0, \ | |
109 | fread ((char *)&__header_offset_temp, sizeof (short), 1, (f)), \ | |
110 | fseek ((f), -sizeof (short), 1), \ | |
111 | (__header_offset_temp==COFF_MAGIC || __header_offset_temp == \ | |
112 | ((COFF_MAGIC >> 8)|((COFF_MAGIC&0xFF)<<8)) \ | |
113 | ? sizeof(struct coffheader) : 0)) | |
114 | ||
115 | #define HEADER_OFFSET_FD(fd) \ | |
116 | (__header_offset_temp = 0, \ | |
117 | read (fd, (char *)&__header_offset_temp, sizeof (short)), \ | |
118 | lseek ((fd), -sizeof (short), 1), \ | |
119 | (__header_offset_temp==COFF_MAGIC || __header_offset_temp == \ | |
120 | ((COFF_MAGIC >> 8)|((COFF_MAGIC&0xFF)<<8)) \ | |
121 | ? sizeof(struct coffheader) : 0)) | |
122 | ||
123 | ||
124 | #else | |
125 | #define HEADER_OFFSET(f) 0 | |
126 | #define HEADER_OFFSET_FD(fd) 0 | |
127 | #endif | |
128 | ||
129 | #define HEADER_SEEK(f) (fseek ((f), HEADER_OFFSET((f)), 1)) | |
130 | #define HEADER_SEEK_FD(fd) (lseek ((fd), HEADER_OFFSET_FD((fd)), 1)) | |
131 | ||
132 | \f | |
133 | /* Describe the characteristics of the BSD header | |
134 | that appears inside the encapsulation. */ | |
135 | ||
136 | #undef _N_HDROFF | |
137 | #undef N_TXTADDR | |
138 | #undef N_DATADDR | |
139 | ||
140 | /* Encapsulated coff files that are linked ZMAGIC have a text segment | |
141 | offset just past the header (and a matching TXTADDR), excluding | |
142 | the headers from the text segment proper but keeping the physical | |
143 | layout and the virtual memory layout page-aligned. | |
144 | ||
145 | Non-encapsulated a.out files that are linked ZMAGIC have a text | |
146 | segment that starts at 0 and an N_TXTADR similarly offset to 0. | |
147 | They too are page-aligned with each other, but they include the | |
148 | a.out header as part of the text. | |
149 | ||
150 | The _N_HDROFF gets sizeof struct exec added to it, so we have | |
151 | to compensate here. See <a.out.gnu.h>. */ | |
152 | ||
153 | #define _N_HDROFF(x) ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \ | |
154 | sizeof (struct coffheader) : -sizeof (struct exec)) | |
155 | ||
156 | /* Address of text segment in memory after it is loaded. */ | |
157 | #define N_TXTADDR(x) \ | |
158 | (TEXT_START_ADDR + \ | |
159 | ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \ | |
160 | sizeof (struct coffheader) + sizeof (struct exec) : 0)) | |
161 | ||
162 | /* I have no idea what this is doing here. -- gnu@toad.com 20Mar90 | |
163 | Perhaps it is to give a size that is acceptable to any machine? */ | |
164 | #undef SEGMENT_SIZE | |
165 | #define SEGMENT_SIZE 0x400000 | |
166 | ||
167 | #define N_DATADDR(x) \ | |
168 | ((N_FLAGS(x) & N_FLAGS_COFF_ENCAPSULATE) ? \ | |
169 | (SEGMENT_SIZE + ((N_TXTADDR(x)+(x).a_text-1) & ~(SEGMENT_SIZE-1))) : \ | |
170 | (N_TXTADDR(x)+(x).a_text)) | |
171 | ||
172 | #endif /* A_OUT_ENCAP_H_SEEN */ |