diff options
Diffstat (limited to 'share/man/man5/link.5')
| -rw-r--r-- | share/man/man5/link.5 | 31 |
1 files changed, 13 insertions, 18 deletions
diff --git a/share/man/man5/link.5 b/share/man/man5/link.5 index 00c1c4dbd81..0b42e0fb1e4 100644 --- a/share/man/man5/link.5 +++ b/share/man/man5/link.5 @@ -1,4 +1,4 @@ -.\" $OpenBSD: link.5,v 1.13 2003/01/19 21:02:15 deraadt Exp $ +.\" $OpenBSD: link.5,v 1.14 2003/10/30 21:31:28 jmc Exp $ .\" $NetBSD: link.5,v 1.5 1996/01/09 00:14:32 pk Exp $ .\" .\" Copyright (c) 1993 Paul Kranenburg @@ -56,8 +56,8 @@ the link-editing process and indirection tables to facilitate .Em Position Independent Code (PIC for short) to improve sharing of code pages among different processes. The collection of data structures described here will be referred to as the -.Em Run-time Relocation Section (RRS) -and is embedded in the standard text and data segments of the dynamically +.Em Run-time Relocation Section +(RRS) and is embedded in the standard text and data segments of the dynamically linked program or shared object image as the existing .Xr a.out 5 format offers no room for it elsewhere. @@ -75,12 +75,12 @@ PIC code differs from conventional code in that it accesses data variables through an indirection table, the Global Offset Table, by convention accessible by the reserved name .Dv _GLOBAL_OFFSET_TABLE_ . -The exact mechanism used for this is machine dependent, usually a machine +The exact mechanism used for this is machine dependent; usually a machine register is reserved for the purpose. The rational behind this construct is to generate code that is independent of the actual load address. Only the values contained in the Global Offset Table may need updating at -run-time depending on the load addresses of the various shared objects +run-time, depending on the load addresses of the various shared objects in the address space. .Pp Likewise, procedure calls to globally defined functions are redirected through @@ -94,7 +94,7 @@ process address space. It also collects all symbols that may be needed by the run-time link editor and stores these along with the image's text and data bits. Another reserved symbol, -.Dv _DYNAMIC +.Dv _DYNAMIC , is used to indicate the presence of the run-time linker structures. Whenever .Dv _DYNAMIC @@ -178,7 +178,6 @@ struct section_dispatch_table { long sdt_plt_sz; }; .Ed -.Pp .Bl -tag -width sdt_loaded .It Fa sdt_loaded A pointer to the first link map loaded (see below). @@ -248,13 +247,12 @@ structure. struct sod { long sod_name; u_int sod_library : 1, - sod_unused : 31; + sod_reserved : 31; short sod_major; short sod_minor; long sod_next; }; .Ed -.Pp .Bl -tag -width sod_library .It Fa sod_name The offset in the text segment of a string describing this link object. @@ -270,7 +268,7 @@ see also .Xr ldconfig 8 .Pc for a shared object matching -.Em lib\&<sod_name>\&.so.n.m . +.Em lib<sod_name>.so.n.m . If not set, .Fa sod_name should point at a full path name for the desired shared object. @@ -355,7 +353,7 @@ See The size of the data represented by this symbol. .El .Pp -A hash table is included within the text segment of shared object to +A hash table is included within the text segment of shared objects to facilitate quick lookup of symbols during run-time link-editing. The .Fa sdt_hash @@ -370,7 +368,6 @@ struct rrs_hash { int rh_next; /* next hash entry */ }; .Ed -.Pp .Bl -tag -width rh_symbolnum .It Fa rh_symbolnum The index of the symbol in the shared object's symbol table (as given by the @@ -400,7 +397,6 @@ struct rt_symbol { struct so_map *rt_smp; }; .Ed -.Pp .Bl -tag -width rt_scraddr .It Fa rt_sp The symbol description. @@ -443,7 +439,6 @@ struct so_debug { struct rt_symbol *dd_cc; }; .Ed -.Pp .Bl -tag -width dd_in_debugger .It Fa dd_version Version number of this interface. @@ -478,11 +473,12 @@ See for more information. .Bd -literal -offset indent struct ld_entry { - void *(*dlopen)(char *, int); + void *(*dlopen)(const char *, int); int (*dlclose)(void *); - void *(*dlsym)(void *, char *); + void *(*dlsym)(void *, const char *); int (*dlctl)(void *, int, void *); void (*dlexit)(void); + void (*dlrsrvd[3])(void); }; .Ed .Pp @@ -502,7 +498,7 @@ struct crt_ldso { caddr_t crt_bp; char *crt_prog; char *crt_ldso; - char *crt_ldentry; + struct ld_entry *crt_ldentry; }; #define CRT_VERSION_SUN 1 #define CRT_VERSION_BSD2 2 @@ -602,7 +598,6 @@ This field is only available with interface version number .Dv LD_HINTS_VERSION_2 and higher. .El -.Pp .Bd -literal -offset indent /* * Hash table element in hints file. |