diff options
Diffstat (limited to 'sys/sys/link_elf.h')
| -rw-r--r-- | sys/sys/link_elf.h | 233 |
1 files changed, 144 insertions, 89 deletions
diff --git a/sys/sys/link_elf.h b/sys/sys/link_elf.h index 78aefcfb16d6..3a5b6aabac67 100644 --- a/sys/sys/link_elf.h +++ b/sys/sys/link_elf.h @@ -1,49 +1,77 @@ /* + * Copyright (c) 1993 Paul Kranenburg + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Paul Kranenburg. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software withough specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $Id$ + */ + +/* * RRS section definitions. - * Nomenclature and, more importantly, the layout of the various - * data structures defined in this header file are borrowed from - * Sun Microsystems' original <link.h>, so we can provide compatibility - * with the SunOS 4.x shared library scheme. * - * $Id: link.h,v 1.2 1993/10/22 21:04:19 pk Exp $ - * (derived from: @(#)link.h 1.6 88/08/19 SMI - * Copyright (c) 1987 by Sun Microsystems, Inc.) + * The layout of some data structures defined in this header file is + * such that we can provide compatibility with the SunOS 4.x shared + * library scheme. */ #ifndef _LINK_H_ #define _LINK_H_ /* - * A `link_object' structure descibes a shared object that is needed + * A `Shared Object Descriptor' descibes a shared object that is needed * to complete the link edit process of the object containing it. - * A list of such objects (chained through `lo_next') is pointed at - * by `ld_need' in the link_dynamic_2 structure. + * A list of such objects (chained through `sod_next') is pointed at + * by `sdt_sods' in the section_dispatch_table structure. */ -struct link_object { - long lo_name; /* name (relative to load address) */ - u_int lo_library : 1, /* searched for by library rules */ - lo_unused : 31; - short lo_major; /* major version number */ - short lo_minor; /* minor version number */ - long lo_next; /* next one (often relative) */ +struct sod { /* Shared Object Descriptor */ + long sod_name; /* name (relative to load address) */ + u_int sod_library : 1, /* Searched for by library rules */ + sod_reserved : 31; + short sod_major; /* major version number */ + short sod_minor; /* minor version number */ + long sod_next; /* next sod */ }; /* - * `link_maps' are used by the run-time link editor (ld.so) to keep - * track of all shared objects loaded into a process' address space. + * `Shared Object Map's are used by the run-time link editor (ld.so) to + * keep track of all shared objects loaded into a process' address space. * These structures are only used at run-time and do not occur within * the text or data segment of an executable or shared library. */ -struct link_map { - caddr_t lm_addr; /* address at which object mapped */ - char *lm_name; /* full name of loaded object */ - struct link_map *lm_next; /* next object in map */ - struct link_object *lm_lop; /* link object that got us here */ - caddr_t lm_lob; /* base address for said link object */ - u_int lm_rwt : 1; /* text is read/write */ - struct link_dynamic *lm_ld; /* dynamic structure */ - caddr_t lm_lpd; /* loader private data */ +struct so_map { /* Shared Object Map */ + caddr_t som_addr; /* Address at which object mapped */ + char *som_path; /* Path to mmap'ed file */ + struct so_map *som_next; /* Next map in chain */ + struct sod *som_sod; /* Sod responsible for this map */ + caddr_t som_sodbase; /* Base address of this sod */ + u_int som_write : 1; /* Text is currently writable */ + struct _dynamic *som_dynamic; /* _dynamic structure */ + caddr_t som_spd; /* Private data */ }; /* @@ -51,7 +79,7 @@ struct link_map { * one field (nz_size) added. * Used to convey size information on items in the data segment * of shared objects. An array of these live in the shared object's - * text segment and is address by the `ld_symbols' field. + * text segment and is addressed by the `sdt_nzlist' field. */ struct nzlist { struct nlist nlist; @@ -65,37 +93,45 @@ struct nzlist { #define nz_other nlist.n_other }; +#define N_AUX(p) ((p)->n_other & 0xf) +#define N_RESERVED(p) (((unsigned int)(p)->n_other >> 4) & 0xf) +#define N_OTHER(r, v) (((unsigned int)(r) << 4) | ((v) & 0xf)) + +#define AUX_OBJECT 1 +#define AUX_FUNC 2 + + /* - * The `link_dynamic_2' structure contains offsets to various data + * The `section_dispatch_table' structure contains offsets to various data * structures needed to do run-time relocation. */ -struct link_dynamic_2 { - struct link_map *ld_loaded; /* list of loaded objects */ - long ld_need; /* list of needed objects */ - long ld_rules; /* search rules for library objects */ - long ld_got; /* global offset table */ - long ld_plt; /* procedure linkage table */ - long ld_rel; /* relocation table */ - long ld_hash; /* symbol hash table */ - long ld_symbols; /* symbol table itself */ - long (*ld_stab_hash)(); /* "pointer" to symbol hash function */ - long ld_buckets; /* number of hash buckets */ - long ld_strings; /* symbol strings */ - long ld_str_sz; /* size of symbol strings */ - long ld_text_sz; /* size of text area */ - long ld_plt_sz; /* size of procedure linkage table */ +struct section_dispatch_table { + struct so_map *sdt_loaded; /* List of loaded objects */ + long sdt_sods; /* List of shared objects descriptors */ + long sdt_filler1; /* Unused (was: search rules) */ + long sdt_got; /* Global offset table */ + long sdt_plt; /* Procedure linkage table */ + long sdt_rel; /* Relocation table */ + long sdt_hash; /* Symbol hash table */ + long sdt_nzlist; /* Symbol table itself */ + long sdt_filler2; /* Unused (was: stab_hash) */ + long sdt_buckets; /* Number of hash buckets */ + long sdt_strings; /* Symbol strings */ + long sdt_str_sz; /* Size of symbol strings */ + long sdt_text_sz; /* Size of text area */ + long sdt_plt_sz; /* Size of procedure linkage table */ }; /* - * RRS symbol hash table, addressed by `ld_hash' in link_dynamic_2 + * RRS symbol hash table, addressed by `sdt_hash' in section_dispatch_table. * Used to quickly lookup symbols of the shared object by hashing * on the symbol's name. `rh_symbolnum' is the index of the symbol - * in the shared object's symbol list (`ld_symbols'), `rh_next' is + * in the shared object's symbol list (`sdt_nzlist'), `rh_next' is * the next symbol in the hash bucket (in case of collisions). */ struct rrs_hash { - int rh_symbolnum; /* symbol number */ - int rh_next; /* next hash entry */ + int rh_symbolnum; /* Symbol number */ + int rh_next; /* Next hash entry */ }; /* @@ -103,86 +139,103 @@ struct rrs_hash { * and data items copied from shared objects. */ struct rt_symbol { - struct nzlist *rt_sp; /* the symbol */ - struct rt_symbol *rt_next; /* next in linear list */ - struct rt_symbol *rt_link; /* next in bucket */ - caddr_t rt_srcaddr; /* address of "master" copy */ + struct nzlist *rt_sp; /* The symbol */ + struct rt_symbol *rt_next; /* Next in linear list */ + struct rt_symbol *rt_link; /* Next in bucket */ + caddr_t rt_srcaddr; /* Address of "master" copy */ + struct so_map *rt_smp; /* Originating map */ }; /* * Debugger interface structure. */ -struct ld_debug { - int ldd_version; /* version # of interface */ - int ldd_in_debugger; /* a debugger is running us */ - int ldd_sym_loaded; /* we loaded some symbols */ - char *ldd_bp_addr; /* place for ld-generated bpt */ - int ldd_bp_inst; /* instruction which was there */ - struct rt_symbol *ldd_cp; /* commons we built */ +struct so_debug { + int dd_version; /* Version # of interface */ + int dd_in_debugger; /* Set when run by debugger */ + int dd_sym_loaded; /* Run-time linking brought more + symbols into scope */ + char *dd_bpt_addr; /* Address of rtld-generated bpt */ + int dd_bpt_shadow; /* Original contents of bpt */ + struct rt_symbol *dd_cc; /* Allocated commons/copied data */ }; /* * Entry points into ld.so - user interface to the run-time linker. - * (see also libdl.a) */ struct ld_entry { - int (*dlopen)(); - int (*dlclose)(); - int (*dlsym)(); + void *(*dlopen) __P((char *, int)); + int (*dlclose) __P((void *)); + void *(*dlsym) __P((void *, char *)); + int (*dlctl) __P((void *, int, void *)); }; /* + * dlctl() commands + */ +#define DL_GETERRNO 1 + +/* + * dl*() prototypes. + */ +extern void *dlopen __P((char *, int)); +extern int dlclose __P((void *)); +extern void *dlsym __P((void *, char *)); +extern int dlctl __P((void *, int, void *)); + + +/* * This is the structure pointed at by the __DYNAMIC symbol if an * executable requires the attention of the run-time link editor. * __DYNAMIC is given the value zero if no run-time linking needs to * be done (it is always present in shared objects). - * The union `ld_un' provides for different versions of the dynamic - * linking mechanism (switched on by `ld_version'). The last version + * The union `d_un' provides for different versions of the dynamic + * linking mechanism (switched on by `d_version'). The last version * used by Sun is 3. We leave some room here and go to version number * 8 for NetBSD, the main difference lying in the support for the * `nz_list' type of symbols. */ -struct link_dynamic { - int ld_version; /* version # of this structure */ - struct ld_debug *ldd; +struct _dynamic { + int d_version; /* version # of this interface */ + struct so_debug *d_debug; union { - struct link_dynamic_2 *ld_2; - } ld_un; - struct ld_entry *ld_entry; + struct section_dispatch_table *d_sdt; + } d_un; + struct ld_entry *d_entry; }; #define LD_VERSION_SUN (3) #define LD_VERSION_BSD (8) #define LD_VERSION_NZLIST_P(v) ((v) >= 8) -#define LD_GOT(x) ((x)->ld_un.ld_2->ld_got) -#define LD_PLT(x) ((x)->ld_un.ld_2->ld_plt) -#define LD_REL(x) ((x)->ld_un.ld_2->ld_rel) -#define LD_SYMBOL(x) ((x)->ld_un.ld_2->ld_symbols) -#define LD_HASH(x) ((x)->ld_un.ld_2->ld_hash) -#define LD_STRINGS(x) ((x)->ld_un.ld_2->ld_strings) -#define LD_NEED(x) ((x)->ld_un.ld_2->ld_need) -#define LD_BUCKETS(x) ((x)->ld_un.ld_2->ld_buckets) +#define LD_GOT(x) ((x)->d_un.d_sdt->sdt_got) +#define LD_PLT(x) ((x)->d_un.d_sdt->sdt_plt) +#define LD_REL(x) ((x)->d_un.d_sdt->sdt_rel) +#define LD_SYMBOL(x) ((x)->d_un.d_sdt->sdt_nzlist) +#define LD_HASH(x) ((x)->d_un.d_sdt->sdt_hash) +#define LD_STRINGS(x) ((x)->d_un.d_sdt->sdt_strings) +#define LD_NEED(x) ((x)->d_un.d_sdt->sdt_sods) +#define LD_BUCKETS(x) ((x)->d_un.d_sdt->sdt_buckets) -#define LD_GOTSZ(x) ((x)->ld_un.ld_2->ld_plt - (x)->ld_un.ld_2->ld_got) -#define LD_RELSZ(x) ((x)->ld_un.ld_2->ld_hash - (x)->ld_un.ld_2->ld_rel) -#define LD_HASHSZ(x) ((x)->ld_un.ld_2->ld_symbols - (x)->ld_un.ld_2->ld_hash) -#define LD_STABSZ(x) ((x)->ld_un.ld_2->ld_strings - (x)->ld_un.ld_2->ld_symbols) -#define LD_PLTSZ(x) ((x)->ld_un.ld_2->ld_plt_sz) -#define LD_STRSZ(x) ((x)->ld_un.ld_2->ld_str_sz) -#define LD_TEXTSZ(x) ((x)->ld_un.ld_2->ld_text_sz) +#define LD_GOTSZ(x) ((x)->d_un.d_sdt->sdt_plt - (x)->d_un.d_sdt->sdt_got) +#define LD_RELSZ(x) ((x)->d_un.d_sdt->sdt_hash - (x)->d_un.d_sdt->sdt_rel) +#define LD_HASHSZ(x) ((x)->d_un.d_sdt->sdt_nzlist - (x)->d_un.d_sdt->sdt_hash) +#define LD_STABSZ(x) ((x)->d_un.d_sdt->sdt_strings - (x)->d_un.d_sdt->sdt_nzlist) +#define LD_PLTSZ(x) ((x)->d_un.d_sdt->sdt_plt_sz) +#define LD_STRSZ(x) ((x)->d_un.d_sdt->sdt_str_sz) +#define LD_TEXTSZ(x) ((x)->d_un.d_sdt->sdt_text_sz) /* - * Interface to ld.so (see link(5)) + * Interface to ld.so */ struct crt_ldso { int crt_ba; /* Base address of ld.so */ int crt_dzfd; /* "/dev/zero" file decriptor (SunOS) */ int crt_ldfd; /* ld.so file descriptor */ - struct link_dynamic *crt_dp;/* Main's __DYNAMIC */ + struct _dynamic *crt_dp; /* Main's __DYNAMIC */ char **crt_ep; /* environment strings */ caddr_t crt_bp; /* Breakpoint if run from debugger */ + char *crt_prog; /* Program name */ }; /* @@ -190,6 +243,8 @@ struct crt_ldso { */ #define CRT_VERSION_SUN 1 #define CRT_VERSION_BSD 2 +#define CRT_VERSION_BSD_2 2 +#define CRT_VERSION_BSD_3 3 /* |