xcoff.h

这个是LINUX下的GDB调度工具的源码

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

   Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   Free Software Foundation, Inc.
   Written by Ian Lance Taylor <[e-mail]>, 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"
#define _EXCEPT ".except"
#define _TYPCHK ".typchk"

/* 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

/* Specifies an exception section.  A section of this type provides 
   information to identify the reason that a trap or ececptin occured within 
   and executable object program */
#define STYP_EXCEPT 0x0100

/* Specifies a type check section.  A section of this type contains parameter 
   argument type check strings used by the AIX binder.  */
#define STYP_TYPCHK 0x4000

#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 */

/* Comment string in .info section */
#define	C_INFO		110	

/* Auxillary Symbol Entries  */

/* 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 */
#define	XMC_SV64   17		/* Read-only 64 bit supervisor call */
#define	XMC_SV3264 18		/* Read-only 32 or 64 bit supervisor call */

/* 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;
};

/*  Flags for xcoff_link_hash_entry.  */

/* Symbol is referenced by a regular object. */
#define XCOFF_REF_REGULAR      0x00000001
/* Symbol is defined by a regular object. */
#define XCOFF_DEF_REGULAR      0x00000002
/* Symbol is defined by a dynamic object. */
#define XCOFF_DEF_DYNAMIC      0x00000004
/* Symbol is used in a reloc being copied into the .loader section.  */
#define XCOFF_LDREL            0x00000008
/* Symbol is the entry point.  */
#define XCOFF_ENTRY            0x00000010
/* Symbol is called; this is, it appears in a R_BR reloc.  */
#define XCOFF_CALLED           0x00000020
/* Symbol needs the TOC entry filled in.  */
#define XCOFF_SET_TOC          0x00000040
/* Symbol is explicitly imported.  */
#define XCOFF_IMPORT           0x00000080
/* Symbol is explicitly exported.  */
#define XCOFF_EXPORT           0x00000100
/* Symbol has been processed by xcoff_build_ldsyms.  */
#define XCOFF_BUILT_LDSYM      0x00000200
/* Symbol is mentioned by a section which was not garbage collected. */
#define XCOFF_MARK             0x00000400
/* Symbol size is recorded in size_list list from hash table.  */
#define XCOFF_HAS_SIZE         0x00000800
/* Symbol is a function descriptor.  */
#define XCOFF_DESCRIPTOR       0x00001000
/* Multiple definitions have been for the symbol. */
#define XCOFF_MULTIPLY_DEFINED 0x00002000
/* Symbol is the __rtinit symbol.  */
#define XCOFF_RTINIT           0x00004000
/* Symbol is an imported 32 bit syscall.  */
#define XCOFF_SYSCALL32        0x00008000
/* Symbol is an imported 64 bit syscall.  */
#define XCOFF_SYSCALL64        0x00010000 

/* The XCOFF linker hash table.  */