245 lines
7.0 KiB
C
245 lines
7.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* IBM RS/6000 "XCOFF" file definitions for BFD.
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Copyright (C) 1990, 1991 Free Software Foundation, Inc.
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FIXME: Can someone provide a transliteration of this name into ASCII?
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Using the following chars caused a compiler warning on HIUX (so I replaced
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them with octal escapes), and isn't useful without an understanding of what
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character set it is.
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Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
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and John Gilmore of Cygnus Support. */
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/********************** FILE HEADER **********************/
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struct external_filehdr {
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char f_magic[2]; /* magic number */
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char f_nscns[2]; /* number of sections */
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char f_timdat[4]; /* time & date stamp */
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char f_symptr[4]; /* file pointer to symtab */
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char f_nsyms[4]; /* number of symtab entries */
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char f_opthdr[2]; /* sizeof(optional hdr) */
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char f_flags[2]; /* flags */
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};
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/* IBM RS/6000 */
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#define U802WRMAGIC 0730 /* writeable text segments **chh** */
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#define U802ROMAGIC 0735 /* readonly sharable text segments */
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#define U802TOCMAGIC 0737 /* readonly text segments and TOC */
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#define BADMAG(x) \
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((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
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(x).f_magic != U802TOCMAGIC)
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#define FILHDR struct external_filehdr
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#define FILHSZ 20
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/********************** AOUT "OPTIONAL HEADER" **********************/
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typedef struct
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{
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unsigned char magic[2]; /* type of file */
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unsigned char vstamp[2]; /* version stamp */
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unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
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unsigned char dsize[4]; /* initialized data " " */
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unsigned char bsize[4]; /* uninitialized data " " */
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unsigned char entry[4]; /* entry pt. */
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unsigned char text_start[4]; /* base of text used for this file */
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unsigned char data_start[4]; /* base of data used for this file */
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unsigned char o_toc[4]; /* address of TOC */
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unsigned char o_snentry[2]; /* section number of entry point */
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unsigned char o_sntext[2]; /* section number of .text section */
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unsigned char o_sndata[2]; /* section number of .data section */
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unsigned char o_sntoc[2]; /* section number of TOC */
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unsigned char o_snloader[2]; /* section number of .loader section */
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unsigned char o_snbss[2]; /* section number of .bss section */
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unsigned char o_algntext[2]; /* .text alignment */
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unsigned char o_algndata[2]; /* .data alignment */
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unsigned char o_modtype[2]; /* module type (??) */
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unsigned char o_cputype[2]; /* cpu type */
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unsigned char o_maxstack[4]; /* max stack size (??) */
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unsigned char o_maxdata[4]; /* max data size (??) */
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unsigned char o_resv2[12]; /* reserved */
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}
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AOUTHDR;
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#define AOUTSZ 72
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#define SMALL_AOUTSZ (28)
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#define AOUTHDRSZ 72
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#define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */
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#define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */
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#define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */
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/********************** SECTION HEADER **********************/
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struct external_scnhdr {
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char s_name[8]; /* section name */
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char s_paddr[4]; /* physical address, aliased s_nlib */
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char s_vaddr[4]; /* virtual address */
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char s_size[4]; /* section size */
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char s_scnptr[4]; /* file ptr to raw data for section */
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char s_relptr[4]; /* file ptr to relocation */
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char s_lnnoptr[4]; /* file ptr to line numbers */
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char s_nreloc[2]; /* number of relocation entries */
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char s_nlnno[2]; /* number of line number entries*/
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char s_flags[4]; /* flags */
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};
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/*
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* names of "special" sections
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*/
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#define _TEXT ".text"
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#define _DATA ".data"
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#define _BSS ".bss"
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#define _PAD ".pad"
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#define _LOADER ".loader"
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#define SCNHDR struct external_scnhdr
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#define SCNHSZ 40
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/* XCOFF uses a special .loader section with type STYP_LOADER. */
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#define STYP_LOADER 0x1000
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/* XCOFF uses a special .debug section with type STYP_DEBUG. */
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#define STYP_DEBUG 0x2000
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/* XCOFF handles line number or relocation overflow by creating
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another section header with STYP_OVRFLO set. */
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#define STYP_OVRFLO 0x8000
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/********************** LINE NUMBERS **********************/
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/* 1 line number entry for every "breakpointable" source line in a section.
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* Line numbers are grouped on a per function basis; first entry in a function
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* grouping will have l_lnno = 0 and in place of physical address will be the
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* symbol table index of the function name.
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*/
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struct external_lineno {
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union {
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char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
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char l_paddr[4]; /* (physical) address of line number */
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} l_addr;
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char l_lnno[2]; /* line number */
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};
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#define LINENO struct external_lineno
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#define LINESZ 6
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/********************** SYMBOLS **********************/
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#define E_SYMNMLEN 8 /* # characters in a symbol name */
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#define E_FILNMLEN 14 /* # characters in a file name */
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#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
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struct external_syment
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{
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union {
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char e_name[E_SYMNMLEN];
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struct {
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char e_zeroes[4];
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char e_offset[4];
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} e;
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} e;
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char e_value[4];
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char e_scnum[2];
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char e_type[2];
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char e_sclass[1];
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char e_numaux[1];
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};
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#define N_BTMASK (017)
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#define N_TMASK (060)
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#define N_BTSHFT (4)
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#define N_TSHIFT (2)
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union external_auxent {
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struct {
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char x_tagndx[4]; /* str, un, or enum tag indx */
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union {
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struct {
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char x_lnno[2]; /* declaration line number */
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char x_size[2]; /* str/union/array size */
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} x_lnsz;
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char x_fsize[4]; /* size of function */
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} x_misc;
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union {
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struct { /* if ISFCN, tag, or .bb */
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char x_lnnoptr[4]; /* ptr to fcn line # */
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char x_endndx[4]; /* entry ndx past block end */
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} x_fcn;
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struct { /* if ISARY, up to 4 dimen. */
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char x_dimen[E_DIMNUM][2];
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} x_ary;
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} x_fcnary;
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char x_tvndx[2]; /* tv index */
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} x_sym;
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union {
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char x_fname[E_FILNMLEN];
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struct {
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char x_zeroes[4];
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char x_offset[4];
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} x_n;
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} x_file;
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struct {
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char x_scnlen[4]; /* section length */
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char x_nreloc[2]; /* # relocation entries */
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char x_nlinno[2]; /* # line numbers */
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} x_scn;
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struct {
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char x_tvfill[4]; /* tv fill value */
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char x_tvlen[2]; /* length of .tv */
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char x_tvran[2][2]; /* tv range */
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} x_tv; /* info about .tv section (in auxent of symbol .tv)) */
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struct {
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unsigned char x_scnlen[4];
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unsigned char x_parmhash[4];
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unsigned char x_snhash[2];
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unsigned char x_smtyp[1];
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unsigned char x_smclas[1];
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unsigned char x_stab[4];
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unsigned char x_snstab[2];
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} x_csect;
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};
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#define SYMENT struct external_syment
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#define SYMESZ 18
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#define AUXENT union external_auxent
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#define AUXESZ 18
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#define DBXMASK 0x80 /* for dbx storage mask */
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#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
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/********************** RELOCATION DIRECTIVES **********************/
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struct external_reloc {
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char r_vaddr[4];
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char r_symndx[4];
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char r_size[1];
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char r_type[1];
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};
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#define RELOC struct external_reloc
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#define RELSZ 10
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#define DEFAULT_DATA_SECTION_ALIGNMENT 4
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#define DEFAULT_BSS_SECTION_ALIGNMENT 4
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#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
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/* For new sections we haven't heard of before */
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#define DEFAULT_SECTION_ALIGNMENT 4
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