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-rw-r--r--include/link.h233
1 files changed, 144 insertions, 89 deletions
diff --git a/include/link.h b/include/link.h
index 78aefcfb16d6..3a5b6aabac67 100644
--- a/include/link.h
+++ b/include/link.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
/*