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unsigned int subspace_location; /* file ptr to subsp dict */
unsigned int subspace_total; /* # of subspaces */
unsigned int loader_fixup_location; /* reserved */
unsigned int loader_fixup_total; /* reserved */
unsigned int space_strings_location; /* file ptr to sp. strings */
unsigned int space_strings_size; /* sizeof sp. strings */
unsigned int init_array_location; /* reserved */
unsigned int init_array_total; /* reserved */
unsigned int compiler_location; /* file ptr to comp recs */
unsigned int compiler_total; /* # of compiler recs */
unsigned int symbol_location; /* file ptr to sym table */
unsigned int symbol_total; /* # of symbols */
unsigned int fixup_request_location; /* file ptr to fixups */
unsigned int fixup_request_total; /* # of fixups */
unsigned int symbol_strings_location; /* file ptr to sym strings */
unsigned int symbol_strings_size; /* sizeof sym strings */
unsigned int unloadable_sp_location; /* file ptr to debug info */
unsigned int unloadable_sp_size; /* size of debug info */
unsigned int checksum; /* header checksum */
\};
the timestamp is a two-word structure as shown below. if unused, both
fields are zero.
struct sys_clock \{
unsigned int secs;
unsigned int nanosecs;
\};
auxiliary headers
the auxiliary headers are contained in a single contiguous area in the
file, and are located by a pointer in the file header. auxiliary
headers are used for two purposes: users can attach version and
copyright strings to an object file, and an auxiliary header contains
the information needed to load an executable program. in an
executable program, the hp-ux auxiliary header must precede all other
auxiliary headers. the following declarations are found in
<aouthdr.h>.
struct aux_id \{
unsigned int mandatory : 1; /* reserved */
unsigned int copy : 1; /* reserved */
unsigned int append : 1; /* reserved */
unsigned int ignore : 1; /* reserved */
unsigned int reserved : 12; /* reserved */
unsigned int type : 16; /* aux hdr type */
unsigned int length; /* sizeof rest of aux hdr */
\};
/* values for the aux_id.type field */
#define hpux_aux_id 4
#define version_aux_id 6
#define copyright_aux_id 9
#define shlib_version_aux_id 10
struct som_exec_auxhdr \{ /* hp-ux auxiliary header */
struct aux_id som_auxhdr; /* aux header id */
long exec_tsize; /* text size */
long exec_tmem; /* start address of text */
long exec_tfile; /* file ptr to text */
long exec_dsize; /* data size */
long exec_dmem; /* start address of data */
long exec_dfile; /* file ptr to data */
long exec_bsize; /* bss size */
long exec_entry; /* address of entry point */
long exec_flags; /* loader flags */
long exec_bfill; /* bss initialization value */
\};
/* values for exec_flags */
#define trap_nil_ptrs 01
struct user_string_aux_hdr \{ /* version string auxiliary header */
struct aux_id header_id; /* aux header id */
unsigned int string_length; /* strlen(user_string) */
char user_string[1]; /* user-defined string */
\};
struct copyright_aux_hdr \{ /* copyright string auxiliary header */
struct aux_id header_id; /* aux header id */
unsigned int string_length; /* strlen(user_string) */
char copyright[1]; /* user-defined string */
\};
struct shlib_version_aux_hdr \{
struct aux_id header_id; /* aux header id */
short version; /* version number */
\};
space dictionary
the space dictionary consists of a sequence of space records as
defined in <spacehdr.h>.
struct space_dictionary_record \{"
union name_pt name; /* index to space name */
unsigned int is_loadable: 1; /* space is loadable */
unsigned int is_defined: 1; /* space is defined within file */
unsigned int is_private: 1; /* space is not sharable */
unsigned int reserved: 13; /* reserved */
unsigned int sort_key: 8; /* sort key for space */
unsigned int reserved2: 8; /* reserved */
int space_number; /* space index */
int subspace_index; /* index to first subspace */
unsigned int subspace_quantity; /* # of subspaces in space */
int loader_fix_index; /* reserved */
unsigned int loader_fix_quantity; /* reserved */
int init_pointer_index; /* reserved */
unsigned int init_pointer_quantity; /* reserved */
\};
the strings for the space names are contained in the space strings
table, which is located by a pointer in the file header. each entry
in the space strings table is preceded by a 4-byte integer that
defines the length of the string, and is terminated by one to five
null characters to pad the string out to a word boundary. indices to
this table are relative to the start of the table, and point to the
first byte of the string (not the preceding length word). the union
defined below is used for all such string pointers; the character
pointer is defined for programs that read the string table into memory
and wish to relocate in-memory copies of space records.
union name_pt \{
char *n_name;
unsigned int n_strx;
\};
subspace dictionary
the subspace dictionary consists of a sequence of subspace records as
defined in <scnhdr.h>. strings for subspace names are contained in
the space strings table.
struct subspace_dictionary_record \{
int space_index;
unsigned int access_control_bits: 7; /* reserved */
unsigned int memory_resident: 1; /* reserved */
unsigned int dup_common: 1; /* cobol-style common */
unsigned int is_common: 1; /* subspace is a common block */
unsigned int is_loadable: 1; /* subspace is loadable */
unsigned int quadrant: 2; /* reserved */
unsigned int initially_frozen: 1; /* reserved */
unsigned int is_first: 1; /* reserved */
unsigned int code_only: 1; /* subspace contains only code */
unsigned int sort_key: 8; /* subspace sort key */
unsigned int replicate_init: 1; /* reserved */
unsigned int continuation: 1; /* reserved */
unsigned int reserved: 6; /* reserved */
int file_loc_init_value; /* file location or init value */
unsigned int initialization_length; /* length of initialization */
unsigned int subspace_start; /* starting offset */
unsigned int subspace_length; /* total subspace length */
unsigned int reserved2: 16; /* reserved */
unsigned int alignment: 16; /* alignment required */
union name_pt name; /* index of subspace name */
int fixup_request_index; /* index to first fixup */
unsigned int fixup_request_quantity; /* # of fixup requests */
\};
symbol table
the symbol table consists of a sequence of entries described by the
structure shown below, from <syms.h>. strings for symbol and
qualifier names are contained in the symbol strings table, whose
structure is identical with the space strings table.
struct symbol_dictionary_record \{
unsigned int hidden: 1; /* reserved */
unsigned int symbol_type: 7; /* symbol type */
unsigned int symbol_scope: 4; /* symbol value */
unsigned int check_level: 3; /* type checking level */
unsigned int must_qualify: 1; /* qualifier required */
unsigned int initially_frozen: 1; /* reserved */
unsigned int memory_resident: 1; /* reserved */
unsigned int is_common: 1; /* common block */
unsigned int dup_common: 1; /* cobol-style common */
unsigned int xleast: 2; /* reserved */
unsigned int arg_reloc: 10; /* parameter relocation bits */
union name_pt name; /* index to symbol name */
union name_pt qualifier_name; /* index to qual name */
unsigned int symbol_info; /* subspace index */
unsigned int symbol_value; /* symbol value */
\};
/* values for symbol_type */
#define st_null 0 /* unused symbol entry */
#define st_absolute 1 /* non-relocatable symbol */
#define st_data 2 /* data symbol */
#define st_code 3 /* generic code symbol */
#define st_pri_prog 4 /* program entry point */
#define st_sec_prog 5 /* secondary prog entry point*/
#define st_entry 6 /* procedure entry point */
#define st_storage 7 /* storage request */
#define st_stub 8 /* reserved */
#define st_module 9 /* pascal module name */
#define st_sym_ext 10 /* symbol extension record */
#define st_arg_ext 11 /* argument extension record */
#define st_millicode 12 /* millicode entry point */
#define st_plabel 13 /* reserved */
#define st_oct_dis 14 /* reserved */
#define st_milli_ext 15 /* reserved */
/* values for symbol_scope */
#define ss_unsat 0 /* unsatisfied reference */
#define ss_external 1 /* reserved */
#define ss_local 2 /* local symbol */
#define ss_universal 3 /* global symbol */
the meaning of the symbol value depends on the symbol type. for the
code symbols (generic code, program entry points, procedure and
millicode entry points), the low-order two bits of the symbol value
encode the execution privilege level, which is not used on hp-ux, but
is generally set to 3. the symbol value with those bits masked out is
the address of the symbol (which is always a multiple of 4). for data
symbols, the symbol value is simply the address of the symbol. for
storage requests, the symbol value is the number of bytes requested;
the linker allocates space for the largest request for each symbol in
the $bss$ subspaces, unless a local or universal symbol is found for
that symbol (in which case the storage request is treated like an
unsatisfied reference).
if a relocatable file is compiled with parameter type checking,
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