aboutsummaryrefslogtreecommitdiff
path: root/include/coff/rs6000.h
blob: afddc765725aa02747023f47522f2610fb4efee4 (plain)
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
/* IBM RS/6000 "XCOFF" file definitions for BFD.
   Copyright 1990, 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
   FIXME: Can someone provide a transliteration of this name into ASCII?
   Using the following chars caused a compiler warning on HIUX (so I replaced
   them with octal escapes), and isn't useful without an understanding of what
   character set it is.
   Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
   and John Gilmore of Cygnus Support.  */

#define DO_NOT_DEFINE_AOUTHDR
#define DO_NOT_DEFINE_AUXENT
#define L_LNNO_SIZE 2
#include "coff/external.h"

        /* IBM RS/6000 */
#define U802WRMAGIC     0730    /* writeable text segments **chh**      */
#define U802ROMAGIC     0735    /* readonly sharable text segments      */
#define U802TOCMAGIC    0737    /* readonly text segments and TOC       */

#define BADMAG(x)	\
	((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
	 (x).f_magic != U802TOCMAGIC)

/********************** AOUT "OPTIONAL HEADER" **********************/

typedef struct 
{
  unsigned char	magic[2];	/* type of file			*/
  unsigned char	vstamp[2];	/* version stamp		*/
  unsigned char	tsize[4];	/* text size in bytes, padded to FW bdry */
  unsigned char	dsize[4];	/* initialized data "  "	*/
  unsigned char	bsize[4];	/* uninitialized data "   "	*/
  unsigned char	entry[4];	/* entry pt.			*/
  unsigned char	text_start[4];	/* base of text used for this file */
  unsigned char	data_start[4];	/* base of data used for this file */
  unsigned char	o_toc[4];	/* address of TOC */
  unsigned char	o_snentry[2];	/* section number of entry point */
  unsigned char	o_sntext[2];	/* section number of .text section */
  unsigned char	o_sndata[2];	/* section number of .data section */
  unsigned char	o_sntoc[2];	/* section number of TOC */
  unsigned char	o_snloader[2];	/* section number of .loader section */
  unsigned char	o_snbss[2];	/* section number of .bss section */
  unsigned char	o_algntext[2];	/* .text alignment */
  unsigned char	o_algndata[2];	/* .data alignment */
  unsigned char	o_modtype[2];	/* module type (??) */
  unsigned char o_cputype[2];	/* cpu type */
  unsigned char	o_maxstack[4];	/* max stack size (??) */
  unsigned char o_maxdata[4];	/* max data size (??) */
  unsigned char	o_resv2[12];	/* reserved */
}
AOUTHDR;

#define AOUTSZ 72
#define SMALL_AOUTSZ (28)
#define AOUTHDRSZ 72

#define	RS6K_AOUTHDR_OMAGIC	0x0107	/* old: text & data writeable */
#define	RS6K_AOUTHDR_NMAGIC	0x0108	/* new: text r/o, data r/w */
#define	RS6K_AOUTHDR_ZMAGIC	0x010B	/* paged: text r/o, both page-aligned */

/* More names of "special" sections.  */
#define _PAD	".pad"
#define _LOADER	".loader"

/* XCOFF uses a special .loader section with type STYP_LOADER.  */
#define STYP_LOADER 0x1000

/* XCOFF uses a special .debug section with type STYP_DEBUG.  */
#define STYP_DEBUG 0x2000

/* XCOFF handles line number or relocation overflow by creating
   another section header with STYP_OVRFLO set.  */
#define STYP_OVRFLO 0x8000

union external_auxent
{
  struct
  {
    char x_tagndx[4];	/* str, un, or enum tag indx */

    union
    {
      struct
      {
	char  x_lnno[2]; /* declaration line number */
	char  x_size[2]; /* str/union/array size */
      } x_lnsz;

      char x_fsize[4];	/* size of function */

    } x_misc;

    union
    {
      struct 		/* if ISFCN, tag, or .bb */
      {
	char x_lnnoptr[4];	/* ptr to fcn line # */
	char x_endndx[4];	/* entry ndx past block end */
      } x_fcn;

      struct 		/* if ISARY, up to 4 dimen. */
      {
	char x_dimen[E_DIMNUM][2];
      } x_ary;

    } x_fcnary;

    char x_tvndx[2];		/* tv index */

  } x_sym;

  union
  {
    char x_fname[E_FILNMLEN];

    struct
    {
      char x_zeroes[4];
      char x_offset[4];
    } x_n;

  } x_file;

  struct
  {
    char x_scnlen[4];			/* section length */
    char x_nreloc[2];	/* # relocation entries */
    char x_nlinno[2];	/* # line numbers */
  } x_scn;

  struct
  {
    char x_tvfill[4];	/* tv fill value */
    char x_tvlen[2];	/* length of .tv */
    char x_tvran[2][2];	/* tv range */
  } x_tv;		/* info about .tv section (in auxent of symbol .tv)) */

  struct
  {
    unsigned char x_scnlen[4];
    unsigned char x_parmhash[4];
    unsigned char x_snhash[2];
    unsigned char x_smtyp[1];
    unsigned char x_smclas[1];
    unsigned char x_stab[4];
    unsigned char x_snstab[2];
  } x_csect;
};

#define	AUXENT	union external_auxent
#define	AUXESZ	18

#define DBXMASK 0x80		/* for dbx storage mask */
#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)

/********************** RELOCATION DIRECTIVES **********************/

struct external_reloc
{
  char r_vaddr[4];
  char r_symndx[4];
  char r_size[1];
  char r_type[1];
};

#define RELOC struct external_reloc
#define RELSZ 10

#define DEFAULT_DATA_SECTION_ALIGNMENT 4
#define DEFAULT_BSS_SECTION_ALIGNMENT 4
#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
/* For new sections we havn't heard of before */
#define DEFAULT_SECTION_ALIGNMENT 4