newlib-cygwin/include/coff/xcoff.h

/* Internal format of XCOFF object file data structures for BFD.

   Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   Written by Ian Lance Taylor <ian@cygnus.com>, Cygnus Support.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef _INTERNAL_XCOFF_H
#define _INTERNAL_XCOFF_H

/*
 * LINKER
 */

/*
 * names of "special" sections
 */
#define _TEXT	".text"
#define _DATA	".data"
#define _BSS	".bss"
#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

#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 */


/* XCOFF relocation types.  
   The relocations are described in the function  
   xcoff[64]_ppc_relocate_section in coff64-rs6000.c and coff-rs6000.c  */

#define R_POS   (0x00)
#define R_NEG   (0x01)
#define R_REL   (0x02)
#define R_TOC   (0x03)
#define R_RTB   (0x04)
#define R_GL    (0x05)
#define R_TCL   (0x06)
#define R_BA    (0x08)
#define R_BR    (0x0a)
#define R_RL    (0x0c)
#define R_RLA   (0x0d)
#define R_REF   (0x0f)
#define R_TRL   (0x12)
#define R_TRLA  (0x13)
#define R_RRTBI (0x14)
#define R_RRTBA (0x15)
#define R_CAI   (0x16)
#define R_CREL  (0x17)
#define R_RBA   (0x18)
#define R_RBAC  (0x19)
#define R_RBR   (0x1a)
#define R_RBRC  (0x1b)


/* 
 * Storage class #defines, from /usr/include/storclass.h 
 * That are not already defined in internal.h
 */
#define	C_INFO		110	/* Comment string in .info section */


/* 
 * AUXILLARY SYMBOL ENTRIES
 *
 * auxemt
 */

/* x_smtyp values:  */

#define	SMTYP_ALIGN(x)	((x) >> 3)	/* log2 of alignment */
#define	SMTYP_SMTYP(x)	((x) & 0x7)	/* symbol type */
/* Symbol type values:  */
#define	XTY_ER	0		/* External reference */
#define	XTY_SD	1		/* Csect definition */
#define	XTY_LD	2		/* Label definition */
#define XTY_CM	3		/* .BSS */
#define	XTY_EM	4		/* Error message */
#define	XTY_US	5		/* "Reserved for internal use" */

/* x_smclas values:  */

#define	XMC_PR	0		/* Read-only program code */
#define	XMC_RO	1		/* Read-only constant */
#define	XMC_DB	2		/* Read-only debug dictionary table */
#define	XMC_TC	3		/* Read-write general TOC entry */
#define	XMC_UA	4		/* Read-write unclassified */
#define	XMC_RW	5		/* Read-write data */
#define	XMC_GL	6		/* Read-only global linkage */
#define	XMC_XO	7		/* Read-only extended operation */
#define	XMC_SV	8		/* Read-only supervisor call */
#define	XMC_BS	9		/* Read-write BSS */
#define	XMC_DS	10		/* Read-write descriptor csect */
#define	XMC_UC	11		/* Read-write unnamed Fortran common */
#define	XMC_TI	12		/* Read-only traceback index csect */
#define	XMC_TB	13		/* Read-only traceback table csect */
/* 		14	??? */
#define	XMC_TC0	15		/* Read-write TOC anchor */
#define XMC_TD	16		/* Read-write data in TOC */

/* The ldhdr structure.  This appears at the start of the .loader
   section.  */

struct internal_ldhdr
{
  /* 
   * The version number: 
   * 1 : 32 bit
   * 2 : 64 bit
   */
  unsigned long l_version;
  /* The number of symbol table entries.  */
  bfd_size_type l_nsyms;
  /* The number of relocation table entries.  */
  bfd_size_type l_nreloc;
  /* The length of the import file string table.  */
  bfd_size_type l_istlen;
  /* The number of import files.  */
  bfd_size_type l_nimpid;
  /* The offset from the start of the .loader section to the first
     entry in the import file table.  */
  bfd_size_type l_impoff;
  /* The length of the string table.  */
  bfd_size_type l_stlen;
  /* The offset from the start of the .loader section to the first
     entry in the string table.  */
  bfd_size_type l_stoff;
  /* The offset to start of the symbol table, only in XCOFF64 */
  bfd_vma l_symoff;
  /* The offset to the start of the relocation table, only in XCOFF64 */
  bfd_vma l_rldoff;
};

/* The ldsym structure.  This is used to represent a symbol in the
   .loader section.  */

struct internal_ldsym
{
  union
    {
      /* The symbol name if <= SYMNMLEN characters.  */
      char _l_name[SYMNMLEN];
      struct
	{
	  /* Zero if the symbol name is more than SYMNMLEN characters.  */
	  long _l_zeroes;
	  /* The offset in the string table if the symbol name is more
             than SYMNMLEN characters.  */
	  long _l_offset;
	} _l_l;
    } _l;
  /* The symbol value.  */
  bfd_vma l_value;
  /* The symbol section number.  */
  short l_scnum;
  /* The symbol type and flags.  */
  char l_smtype;
  /* The symbol storage class.  */
  char l_smclas;
  /* The import file ID.  */
  bfd_size_type l_ifile;
  /* Offset to the parameter type check string.  */
  bfd_size_type l_parm;
};

/* These flags are for the l_smtype field (the lower three bits are an
   XTY_* value).  */

/* Imported symbol.  */
#define L_IMPORT (0x40)
/* Entry point.  */
#define L_ENTRY (0x20)
/* Exported symbol.  */
#define L_EXPORT (0x10)

/* The ldrel structure.  This is used to represent a reloc in the
   .loader section.  */

struct internal_ldrel
{
  /* The reloc address.  */
  bfd_vma l_vaddr;
  /* The symbol table index in the .loader section symbol table.  */
  bfd_size_type l_symndx;
  /* The relocation type and size.  */
  short l_rtype;
  /* The section number this relocation applies to.  */
  short l_rsecnm;
};

/* An entry in the XCOFF linker hash table.  */
struct xcoff_link_hash_entry
{
  struct bfd_link_hash_entry root;

  /* Symbol index in output file.  Set to -1 initially.  Set to -2 if
     there is a reloc against this symbol.  */
  long indx;

  /* If we have created a TOC entry for this symbol, this is the .tc
     section which holds it.  */
  asection *toc_section;

  union
    {
      /* If we have created a TOC entry (the XCOFF_SET_TOC flag is
	 set), this is the offset in toc_section.  */
      bfd_vma toc_offset;
      /* If the TOC entry comes from an input file, this is set to the
         symbol index of the C_HIDEXT XMC_TC or XMC_TD symbol.  */
      long toc_indx;
    } u;

  /* If this symbol is a function entry point which is called, this
     field holds a pointer to the function descriptor.  If this symbol
     is a function descriptor, this field holds a pointer to the
     function entry point.  */
  struct xcoff_link_hash_entry *descriptor;

  /* The .loader symbol table entry, if there is one.  */
  struct internal_ldsym *ldsym;

  /* If XCOFF_BUILT_LDSYM is set, this is the .loader symbol table
     index.  If XCOFF_BUILD_LDSYM is clear, and XCOFF_IMPORT is set,
     this is the l_ifile value.  */
  long ldindx;

  /* Some linker flags.  */
  unsigned long flags;

  /* The storage mapping class.  */
  unsigned char smclas;
};

/*
 * #define for xcoff_link_hash_entry.flags
 *
 * XCOFF_REF_REGULAR
 * Symbol is referenced by a regular object. 
 *
 * XCOFF_DEF_REGULAR
 * Symbol is defined by a regular object. 
 *
 * XCOFF_DEF_DYNAMIC
 * Symbol is defined by a dynamic object. 
 *
 * XCOFF_LDREL
 * Symbol is used in a reloc being copied into the .loader section.
 *
 * XCOFF_ENTRY
 * Symbol is the entry point.
 *
 * XCOFF_CALLED
 * Symbol is called; this is, it appears in a R_BR reloc. 
 *
 * XCOFF_SET_TOC
 * Symbol needs the TOC entry filled in.
 *
 * XCOFF_IMPORT
 * Symbol is explicitly imported.
 *
 * XCOFF_EXPORT
 * Symbol is explicitly exported.
 *
 * XCOFF_BUILT_LDSYM
 * Symbol has been processed by xcoff_build_ldsyms.
 *
 * XCOFF_MARK
 * Symbol is mentioned by a section which was not garbage collected. 
 *
 * XCOFF_HAS_SIZE
 * Symbol size is recorded in size_list list from hash table. 
 *
 * XCOFF_DESCRIPTOR
 * Symbol is a function descriptor. 
 *
 * XCOFF_MULTIPLY_DEFINED
 * Multiple definitions have been for the symbol. 
 *
 * XCOFF_RTINIT 
 * Symbol is the __rtinit symbol 
 *
 */

#define XCOFF_REF_REGULAR      0x00000001
#define XCOFF_DEF_REGULAR      0x00000002
#define XCOFF_DEF_DYNAMIC      0x00000004
#define XCOFF_LDREL            0x00000008
#define XCOFF_ENTRY            0x00000010
#define XCOFF_CALLED           0x00000020
#define XCOFF_SET_TOC          0x00000040
#define XCOFF_IMPORT           0x00000080
#define XCOFF_EXPORT           0x00000100
#define XCOFF_BUILT_LDSYM      0x00000200
#define XCOFF_MARK             0x00000400
#define XCOFF_HAS_SIZE         0x00000800
#define XCOFF_DESCRIPTOR       0x00001000
#define XCOFF_MULTIPLY_DEFINED 0x00002000
#define XCOFF_RTINIT           0x00004000


/* The XCOFF linker hash table.  */

#define XCOFF_NUMBER_OF_SPECIAL_SECTIONS 6
#define XCOFF_SPECIAL_SECTION_TEXT       0
#define XCOFF_SPECIAL_SECTION_ETEXT      1 
#define XCOFF_SPECIAL_SECTION_DATA       2
#define XCOFF_SPECIAL_SECTION_EDATA      3
#define XCOFF_SPECIAL_SECTION_END        4
#define XCOFF_SPECIAL_SECTION_END2       5

struct xcoff_link_hash_table
{
  struct bfd_link_hash_table root;

  /* The .debug string hash table.  We need to compute this while
     reading the input files, so that we know how large the .debug
     section will be before we assign section positions.  */
  struct bfd_strtab_hash *debug_strtab;

  /* The .debug section we will use for the final output.  */
  asection *debug_section;

  /* The .loader section we will use for the final output.  */
  asection *loader_section;

  /* A count of non TOC relative relocs which will need to be
     allocated in the .loader section.  */
  size_t ldrel_count;

  /* The .loader section header.  */
  struct internal_ldhdr ldhdr;

  /* The .gl section we use to hold global linkage code.  */
  asection *linkage_section;

  /* The .tc section we use to hold toc entries we build for global
     linkage code.  */
  asection *toc_section;

  /* The .ds section we use to hold function descriptors which we
     create for exported symbols.  */
  asection *descriptor_section;

  /* The list of import files.  */
  struct xcoff_import_file *imports;

  /* Required alignment of sections within the output file.  */
  unsigned long file_align;

  /* Whether the .text section must be read-only.  */
  boolean textro;

  /* Whether garbage collection was done.  */
  boolean gc;

  /* A linked list of symbols for which we have size information.  */
  struct xcoff_link_size_list
    {
      struct xcoff_link_size_list *next;
      struct xcoff_link_hash_entry *h;
      bfd_size_type size;
    } *size_list;

  /* Magic sections: _text, _etext, _data, _edata, _end, end. */
  asection *special_sections[XCOFF_NUMBER_OF_SPECIAL_SECTIONS];
};


/* This structure is used to pass information through
   xcoff_link_hash_traverse.  */

struct xcoff_loader_info
{
  /* Set if a problem occurred.  */
  boolean failed;
  /* Output BFD.  */
  bfd *output_bfd;
  /* Link information structure.  */
  struct bfd_link_info *info;
  /* Whether all defined symbols should be exported.  */
  boolean export_defineds;
  /* Number of ldsym structures.  */
  size_t ldsym_count;
  /* Size of string table.  */
  size_t string_size;
  /* String table.  */
  bfd_byte *strings;
  /* Allocated size of string table.  */
  size_t string_alc;
};

/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
   from smaller values.  Start with zero, widen, *then* decrement.  */
#define MINUS_ONE       (((bfd_vma)0) - 1)


/* 
 * __rtinit 
 * from /usr/include/rtinit.h
 */
struct __rtinit {
  int		(*rtl) PARAMS ((void));	/* Pointer to runtime linker.
					   XXX: Is the parameter really void?  */
  int		init_offset;		/* Offset to array of init functions
					   (0 if none). */
  int		fini_offset;		/* Offset to array of fini functions
					   (0 if none). */
  int		__rtinit_descriptor_size; /* Size of __RTINIT_DESCRIPTOR.
					     This value should be used instead
					     of sizeof(__RTINIT_DESCRIPTOR). */
};

#define RTINIT_DESCRIPTOR_SIZE (12)

struct __rtinit_descriptor {
  int	f;		/* Init/fini function. */
  int			name_offset;	/* Offset (within __rtinit symbol)
					   to name of function. */
  unsigned char	flags;		/* Flags */
};



/* 
 * ARCHIVE
 */

#define XCOFFARMAG    "<aiaff>\012"
#define XCOFFARMAGBIG "<bigaf>\012"
#define SXCOFFARMAG   8

/* This terminates an XCOFF archive member name.  */

#define XCOFFARFMAG "`\012"
#define SXCOFFARFMAG 2

/* XCOFF archives start with this (printable) structure.  */

struct xcoff_ar_file_hdr
{
  /* Magic string.  */
  char magic[SXCOFFARMAG];

  /* Offset of the member table (decimal ASCII string).  */
  char memoff[12];

  /* Offset of the global symbol table (decimal ASCII string).  */
  char symoff[12];

  /* Offset of the first member in the archive (decimal ASCII string).  */
  char firstmemoff[12];

  /* Offset of the last member in the archive (decimal ASCII string).  */
  char lastmemoff[12];

  /* Offset of the first member on the free list (decimal ASCII
     string).  */
  char freeoff[12];
};

#define SIZEOF_AR_FILE_HDR (5 * 12 + SXCOFFARMAG)

/* This is the equivalent data structure for the big archive format.  */

struct xcoff_ar_file_hdr_big
{
  /* Magic string.  */
  char magic[SXCOFFARMAG];

  /* Offset of the member table (decimal ASCII string).  */
  char memoff[20];

  /* Offset of the global symbol table for 32-bit objects (decimal ASCII
     string).  */
  char symoff[20];

  /* Offset of the global symbol table for 64-bit objects (decimal ASCII
     string).  */
  char symoff64[20];

  /* Offset of the first member in the archive (decimal ASCII string).  */
  char firstmemoff[20];

  /* Offset of the last member in the archive (decimal ASCII string).  */
  char lastmemoff[20];

  /* Offset of the first member on the free list (decimal ASCII
     string).  */
  char freeoff[20];
};

#define SIZEOF_AR_FILE_HDR_BIG (6 * 20 + SXCOFFARMAG)


/* Each XCOFF archive member starts with this (printable) structure.  */

struct xcoff_ar_hdr
{
  /* File size not including the header (decimal ASCII string).  */
  char size[12];

  /* File offset of next archive member (decimal ASCII string).  */
  char nextoff[12];

  /* File offset of previous archive member (decimal ASCII string).  */
  char prevoff[12];

  /* File mtime (decimal ASCII string).  */
  char date[12];

  /* File UID (decimal ASCII string).  */
  char uid[12];

  /* File GID (decimal ASCII string).  */
  char gid[12];

  /* File mode (octal ASCII string).  */
  char mode[12];

  /* Length of file name (decimal ASCII string).  */
  char namlen[4];

  /* This structure is followed by the file name.  The length of the
     name is given in the namlen field.  If the length of the name is
     odd, the name is followed by a null byte.  The name and optional
     null byte are followed by XCOFFARFMAG, which is not included in
     namlen.  The contents of the archive member follow; the number of
     bytes is given in the size field.  */
};

#define SIZEOF_AR_HDR (7 * 12 + 4)

/* The equivalent for the big archive format.  */

struct xcoff_ar_hdr_big
{
  /* File size not including the header (decimal ASCII string).  */
  char size[20];

  /* File offset of next archive member (decimal ASCII string).  */
  char nextoff[20];

  /* File offset of previous archive member (decimal ASCII string).  */
  char prevoff[20];

  /* File mtime (decimal ASCII string).  */
  char date[12];

  /* File UID (decimal ASCII string).  */
  char uid[12];

  /* File GID (decimal ASCII string).  */
  char gid[12];

  /* File mode (octal ASCII string).  */
  char mode[12];

  /* Length of file name (decimal ASCII string).  */
  char namlen[4];

  /* This structure is followed by the file name.  The length of the
     name is given in the namlen field.  If the length of the name is
     odd, the name is followed by a null byte.  The name and optional
     null byte are followed by XCOFFARFMAG, which is not included in
     namlen.  The contents of the archive member follow; the number of
     bytes is given in the size field.  */
};

#define SIZEOF_AR_HDR_BIG (3 * 20 + 4 * 12 + 4)

/* We often have to distinguish between the old and big file format.
   Make it a bit cleaner.  We can use `xcoff_ardata' here because the
   `hdr' member has the same size and position in both formats.  */
#define xcoff_big_format_p(abfd) \
  (xcoff_ardata (abfd)->magic[1] == 'b')

/* We store a copy of the xcoff_ar_file_hdr in the tdata field of the
   artdata structure.  Similar for the big archive.  */
#define xcoff_ardata(abfd) \
  ((struct xcoff_ar_file_hdr *) bfd_ardata (abfd)->tdata)
#define xcoff_ardata_big(abfd) \
  ((struct xcoff_ar_file_hdr_big *) bfd_ardata (abfd)->tdata)

/* We store a copy of the xcoff_ar_hdr in the arelt_data field of an
   archive element.  Similar for the big archive.  */
#define arch_eltdata(bfd) ((struct areltdata *) ((bfd)->arelt_data))
#define arch_xhdr(bfd) \
  ((struct xcoff_ar_hdr *) arch_eltdata (bfd)->arch_header)
#define arch_xhdr_big(bfd) \
  ((struct xcoff_ar_hdr_big *) arch_eltdata (bfd)->arch_header)

#endif /* _INTERNAL_XCOFF_H */