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TOMOYO Linux Cross Reference
Linux/arch/powerpc/boot/rs6000.h

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  1 /* IBM RS/6000 "XCOFF" file definitions for BFD.
  2    Copyright (C) 1990, 1991 Free Software Foundation, Inc.
  3    FIXME: Can someone provide a transliteration of this name into ASCII?
  4    Using the following chars caused a compiler warning on HIUX (so I replaced
  5    them with octal escapes), and isn't useful without an understanding of what
  6    character set it is.
  7    Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
  8    and John Gilmore of Cygnus Support.  */
  9 
 10 /********************** FILE HEADER **********************/
 11 
 12 struct external_filehdr {
 13         char f_magic[2];        /* magic number                 */
 14         char f_nscns[2];        /* number of sections           */
 15         char f_timdat[4];       /* time & date stamp            */
 16         char f_symptr[4];       /* file pointer to symtab       */
 17         char f_nsyms[4];        /* number of symtab entries     */
 18         char f_opthdr[2];       /* sizeof(optional hdr)         */
 19         char f_flags[2];        /* flags                        */
 20 };
 21 
 22         /* IBM RS/6000 */
 23 #define U802WRMAGIC     0730    /* writeable text segments **chh**      */
 24 #define U802ROMAGIC     0735    /* readonly sharable text segments      */
 25 #define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
 26 
 27 #define BADMAG(x)       \
 28         ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
 29          (x).f_magic != U802TOCMAGIC)
 30 
 31 #define FILHDR  struct external_filehdr
 32 #define FILHSZ  20
 33 
 34 
 35 /********************** AOUT "OPTIONAL HEADER" **********************/
 36 
 37 
 38 typedef struct
 39 {
 40   unsigned char magic[2];       /* type of file                 */
 41   unsigned char vstamp[2];      /* version stamp                */
 42   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry */
 43   unsigned char dsize[4];       /* initialized data "  "        */
 44   unsigned char bsize[4];       /* uninitialized data "   "     */
 45   unsigned char entry[4];       /* entry pt.                    */
 46   unsigned char text_start[4];  /* base of text used for this file */
 47   unsigned char data_start[4];  /* base of data used for this file */
 48   unsigned char o_toc[4];       /* address of TOC */
 49   unsigned char o_snentry[2];   /* section number of entry point */
 50   unsigned char o_sntext[2];    /* section number of .text section */
 51   unsigned char o_sndata[2];    /* section number of .data section */
 52   unsigned char o_sntoc[2];     /* section number of TOC */
 53   unsigned char o_snloader[2];  /* section number of .loader section */
 54   unsigned char o_snbss[2];     /* section number of .bss section */
 55   unsigned char o_algntext[2];  /* .text alignment */
 56   unsigned char o_algndata[2];  /* .data alignment */
 57   unsigned char o_modtype[2];   /* module type (??) */
 58   unsigned char o_cputype[2];   /* cpu type */
 59   unsigned char o_maxstack[4];  /* max stack size (??) */
 60   unsigned char o_maxdata[4];   /* max data size (??) */
 61   unsigned char o_resv2[12];    /* reserved */
 62 }
 63 AOUTHDR;
 64 
 65 #define AOUTSZ 72
 66 #define SMALL_AOUTSZ (28)
 67 #define AOUTHDRSZ 72
 68 
 69 #define RS6K_AOUTHDR_OMAGIC     0x0107  /* old: text & data writeable */
 70 #define RS6K_AOUTHDR_NMAGIC     0x0108  /* new: text r/o, data r/w */
 71 #define RS6K_AOUTHDR_ZMAGIC     0x010B  /* paged: text r/o, both page-aligned */
 72 
 73 
 74 /********************** SECTION HEADER **********************/
 75 
 76 
 77 struct external_scnhdr {
 78         char            s_name[8];      /* section name                 */
 79         char            s_paddr[4];     /* physical address, aliased s_nlib */
 80         char            s_vaddr[4];     /* virtual address              */
 81         char            s_size[4];      /* section size                 */
 82         char            s_scnptr[4];    /* file ptr to raw data for section */
 83         char            s_relptr[4];    /* file ptr to relocation       */
 84         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 85         char            s_nreloc[2];    /* number of relocation entries */
 86         char            s_nlnno[2];     /* number of line number entries*/
 87         char            s_flags[4];     /* flags                        */
 88 };
 89 
 90 /*
 91  * names of "special" sections
 92  */
 93 #define _TEXT   ".text"
 94 #define _DATA   ".data"
 95 #define _BSS    ".bss"
 96 #define _PAD    ".pad"
 97 #define _LOADER ".loader"
 98 
 99 #define SCNHDR  struct external_scnhdr
100 #define SCNHSZ  40
101 
102 /* XCOFF uses a special .loader section with type STYP_LOADER.  */
103 #define STYP_LOADER 0x1000
104 
105 /* XCOFF uses a special .debug section with type STYP_DEBUG.  */
106 #define STYP_DEBUG 0x2000
107 
108 /* XCOFF handles line number or relocation overflow by creating
109    another section header with STYP_OVRFLO set.  */
110 #define STYP_OVRFLO 0x8000
111 
112 /********************** LINE NUMBERS **********************/
113 
114 /* 1 line number entry for every "breakpointable" source line in a section.
115  * Line numbers are grouped on a per function basis; first entry in a function
116  * grouping will have l_lnno = 0 and in place of physical address will be the
117  * symbol table index of the function name.
118  */
119 struct external_lineno {
120         union {
121                 char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
122                 char l_paddr[4];        /* (physical) address of line number    */
123         } l_addr;
124         char l_lnno[2]; /* line number          */
125 };
126 
127 
128 #define LINENO  struct external_lineno
129 #define LINESZ  6
130 
131 
132 /********************** SYMBOLS **********************/
133 
134 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
135 #define E_FILNMLEN      14      /* # characters in a file name          */
136 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
137 
138 struct external_syment
139 {
140   union {
141     char e_name[E_SYMNMLEN];
142     struct {
143       char e_zeroes[4];
144       char e_offset[4];
145     } e;
146   } e;
147   char e_value[4];
148   char e_scnum[2];
149   char e_type[2];
150   char e_sclass[1];
151   char e_numaux[1];
152 };
153 
154 
155 
156 #define N_BTMASK        (017)
157 #define N_TMASK         (060)
158 #define N_BTSHFT        (4)
159 #define N_TSHIFT        (2)
160 
161 
162 union external_auxent {
163         struct {
164                 char x_tagndx[4];       /* str, un, or enum tag indx */
165                 union {
166                         struct {
167                             char  x_lnno[2]; /* declaration line number */
168                             char  x_size[2]; /* str/union/array size */
169                         } x_lnsz;
170                         char x_fsize[4];        /* size of function */
171                 } x_misc;
172                 union {
173                         struct {                /* if ISFCN, tag, or .bb */
174                             char x_lnnoptr[4];  /* ptr to fcn line # */
175                             char x_endndx[4];   /* entry ndx past block end */
176                         } x_fcn;
177                         struct {                /* if ISARY, up to 4 dimen. */
178                             char x_dimen[E_DIMNUM][2];
179                         } x_ary;
180                 } x_fcnary;
181                 char x_tvndx[2];                /* tv index */
182         } x_sym;
183 
184         union {
185                 char x_fname[E_FILNMLEN];
186                 struct {
187                         char x_zeroes[4];
188                         char x_offset[4];
189                 } x_n;
190         } x_file;
191 
192         struct {
193                 char x_scnlen[4];                       /* section length */
194                 char x_nreloc[2];       /* # relocation entries */
195                 char x_nlinno[2];       /* # line numbers */
196         } x_scn;
197 
198         struct {
199                 char x_tvfill[4];       /* tv fill value */
200                 char x_tvlen[2];        /* length of .tv */
201                 char x_tvran[2][2];     /* tv range */
202         } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
203 
204         struct {
205                 unsigned char x_scnlen[4];
206                 unsigned char x_parmhash[4];
207                 unsigned char x_snhash[2];
208                 unsigned char x_smtyp[1];
209                 unsigned char x_smclas[1];
210                 unsigned char x_stab[4];
211                 unsigned char x_snstab[2];
212         } x_csect;
213 
214 };
215 
216 #define SYMENT  struct external_syment
217 #define SYMESZ  18
218 #define AUXENT  union external_auxent
219 #define AUXESZ  18
220 #define DBXMASK 0x80            /* for dbx storage mask */
221 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
222 
223 
224 
225 /********************** RELOCATION DIRECTIVES **********************/
226 
227 
228 struct external_reloc {
229   char r_vaddr[4];
230   char r_symndx[4];
231   char r_size[1];
232   char r_type[1];
233 };
234 
235 
236 #define RELOC struct external_reloc
237 #define RELSZ 10
238 
239 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
240 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
241 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
242 /* For new sections we haven't heard of before */
243 #define DEFAULT_SECTION_ALIGNMENT 4
244 

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