196 lines
6.5 KiB
C
196 lines
6.5 KiB
C
/*
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* RRS section definitions.
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* Nomenclature and, more importantly, the layout of the various
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* data structures defined in this header file are borrowed from
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* Sun Microsystems' original <link.h>, so we can provide compatibility
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* with the SunOS 4.x shared library scheme.
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*
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* $Id: link_aout.h,v 1.1 1993/10/17 00:51:31 pk Exp $
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* (derived from: @(#)link.h 1.6 88/08/19 SMI
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* Copyright (c) 1987 by Sun Microsystems, Inc.)
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*/
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#ifndef _LINK_H_
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#define _LINK_H_
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/*
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* A `link_object' structure descibes a shared object that is needed
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* to complete the link edit process of the object containing it.
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* A list of such objects (chained through `lo_next') is pointed at
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* by `ld_need' in the link_dynamic_2 structure.
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*/
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struct link_object {
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long lo_name; /* name (relative to load address) */
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u_int lo_library : 1, /* searched for by library rules */
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lo_unused : 31;
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short lo_major; /* major version number */
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short lo_minor; /* minor version number */
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long lo_next; /* next one (often relative) */
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};
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/*
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* `link_maps' are used by the run-time link editor (ld.so) to keep
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* track of all shared objects loaded into a process' address space.
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* These structures are only used at run-time and do not occur within
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* the text or data segment of an executable or shared library.
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*/
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struct link_map {
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caddr_t lm_addr; /* address at which object mapped */
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char *lm_name; /* full name of loaded object */
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struct link_map *lm_next; /* next object in map */
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struct link_object *lm_lop; /* link object that got us here */
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caddr_t lm_lob; /* base address for said link object */
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u_int lm_rwt : 1; /* text is read/write */
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struct link_dynamic *lm_ld; /* dynamic structure */
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caddr_t lm_lpd; /* loader private data */
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};
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/*
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* Symbol description with size. This is simply an `nlist' with
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* one field (nz_size) added.
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* Used to convey size information on items in the data segment
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* of shared objects. An array of these live in the shared object's
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* text segment and is address by the `ld_symbols' field.
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*/
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struct nzlist {
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struct nlist nlist;
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u_long nz_size;
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#define nz_un nlist.n_un
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#define nz_strx nlist.n_un.n_strx
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#define nz_name nlist.n_un.n_name
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#define nz_type nlist.n_type
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#define nz_value nlist.n_value
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#define nz_desc nlist.n_desc
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#define nz_other nlist.n_other
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};
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/*
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* The `link_dynamic_2' structure contains offsets to various data
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* structures needed to do run-time relocation.
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*/
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struct link_dynamic_2 {
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struct link_map *ld_loaded; /* list of loaded objects */
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long ld_need; /* list of needed objects */
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long ld_rules; /* search rules for library objects */
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long ld_got; /* global offset table */
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long ld_plt; /* procedure linkage table */
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long ld_rel; /* relocation table */
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long ld_hash; /* symbol hash table */
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long ld_symbols; /* symbol table itself */
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long (*ld_stab_hash)(); /* "pointer" to symbol hash function */
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long ld_buckets; /* number of hash buckets */
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long ld_strings; /* symbol strings */
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long ld_str_sz; /* size of symbol strings */
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long ld_text_sz; /* size of text area */
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long ld_plt_sz; /* size of procedure linkage table */
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};
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/*
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* RRS symbol hash table, addressed by `ld_hash' in link_dynamic_2
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* Used to quickly lookup symbols of the shared object by hashing
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* on the symbol's name. `rh_symbolnum' is the index of the symbol
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* in the shared object's symbol list (`ld_symbols'), `rh_next' is
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* the next symbol in the hash bucket (in case of collisions).
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*/
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struct rrs_hash {
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int rh_symbolnum; /* symbol number */
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int rh_next; /* next hash entry */
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};
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/*
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* `rt_symbols' is used to keep track of run-time allocated commons
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* and data items copied from shared objects.
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*/
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struct rt_symbol {
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struct nzlist *rt_sp; /* the symbol */
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struct rt_symbol *rt_next; /* next in linear list */
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struct rt_symbol *rt_link; /* next in bucket */
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caddr_t rt_srcaddr; /* address of "master" copy */
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};
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/*
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* Debugger interface structure.
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*/
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struct ld_debug {
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int ldd_version; /* version # of interface */
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int ldd_in_debugger; /* a debugger is running us */
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int ldd_sym_loaded; /* we loaded some symbols */
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char *ldd_bp_addr; /* place for ld-generated bpt */
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int ldd_bp_inst; /* instruction which was there */
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struct rt_symbol *ldd_cp; /* commons we built */
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};
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/*
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* Entry points into ld.so - user interface to the run-time linker.
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* (see also libdl.a)
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*/
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struct ld_entry {
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int (*dlopen)();
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int (*dlclose)();
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int (*dlsym)();
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};
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/*
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* This is the structure pointed at by the __DYNAMIC symbol if an
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* executable requires the attention of the run-time link editor.
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* __DYNAMIC is given the value zero if no run-time linking needs to
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* be done (it is always present in shared objects).
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* The union `ld_un' provides for different versions of the dynamic
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* linking mechanism (switched on by `ld_version'). The last version
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* used by Sun is 3. We leave some room here and go to version number
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* 8 for NetBSD, the main difference lying in the support for the
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* `nz_list' type of symbols.
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*/
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struct link_dynamic {
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int ld_version; /* version # of this structure */
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struct ld_debug *ldd;
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union {
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struct link_dynamic_2 *ld_2;
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} ld_un;
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struct ld_entry *ld_entry;
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};
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#define LD_VERSION_SUN (3)
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#define LD_VERSION_BSD (8)
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#define LD_VERSION_NZLIST_P(v) ((v) >= 8)
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#define LD_GOT(x) ((x)->ld_un.ld_2->ld_got)
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#define LD_PLT(x) ((x)->ld_un.ld_2->ld_plt)
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#define LD_REL(x) ((x)->ld_un.ld_2->ld_rel)
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#define LD_SYMBOL(x) ((x)->ld_un.ld_2->ld_symbols)
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#define LD_HASH(x) ((x)->ld_un.ld_2->ld_hash)
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#define LD_STRINGS(x) ((x)->ld_un.ld_2->ld_strings)
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#define LD_NEED(x) ((x)->ld_un.ld_2->ld_need)
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#define LD_BUCKETS(x) ((x)->ld_un.ld_2->ld_buckets)
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#define LD_GOTSZ(x) ((x)->ld_un.ld_2->ld_plt - (x)->ld_un.ld_2->ld_got)
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#define LD_RELSZ(x) ((x)->ld_un.ld_2->ld_hash - (x)->ld_un.ld_2->ld_rel)
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#define LD_HASHSZ(x) ((x)->ld_un.ld_2->ld_symbols - (x)->ld_un.ld_2->ld_hash)
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#define LD_STABSZ(x) ((x)->ld_un.ld_2->ld_strings - (x)->ld_un.ld_2->ld_symbols)
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#define LD_PLTSZ(x) ((x)->ld_un.ld_2->ld_plt_sz)
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#define LD_STRSZ(x) ((x)->ld_un.ld_2->ld_str_sz)
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#define LD_TEXTSZ(x) ((x)->ld_un.ld_2->ld_text_sz)
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/*
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* Interface to ld.so (see link(5))
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*/
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struct crt_ldso {
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int crt_ba; /* Base address of ld.so */
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int crt_dzfd; /* "/dev/zero" file decriptor (SunOS) */
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int crt_ldfd; /* ld.so file descriptor */
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struct link_dynamic *crt_dp;/* Main's __DYNAMIC */
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char **crt_ep; /* environment strings */
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caddr_t crt_bp; /* Breakpoint if run from debugger */
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};
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/*
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* Version passed from crt0 to ld.so (1st argument to _rtld()).
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*/
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#define CRT_VERSION_SUN 1
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#define CRT_VERSION_BSD 2
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#endif /* _LINK_H_ */
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