Annotation of src/include/link_aout.h, Revision 1.1
1.1 ! art 1: /* $OpenBSD$ */
! 2:
! 3: /*
! 4: * Copyright (c) 1993 Paul Kranenburg
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. All advertising materials mentioning features or use of this software
! 16: * must display the following acknowledgement:
! 17: * This product includes software developed by Paul Kranenburg.
! 18: * 4. The name of the author may not be used to endorse or promote products
! 19: * derived from this software without specific prior written permission
! 20: *
! 21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 31: */
! 32:
! 33: /*
! 34: * RRS section definitions.
! 35: *
! 36: * The layout of some data structures defined in this header file is
! 37: * such that we can provide compatibility with the SunOS 4.x shared
! 38: * library scheme.
! 39: */
! 40:
! 41: /*
! 42: * Symbol description with size. This is simply an `nlist' with
! 43: * one field (nz_size) added.
! 44: * Used to convey size information on items in the data segment
! 45: * of shared objects. An array of these live in the shared object's
! 46: * text segment and is addressed by the `sdt_nzlist' field.
! 47: */
! 48: struct nzlist {
! 49: struct nlist nlist;
! 50: u_long nz_size;
! 51: #define nz_un nlist.n_un
! 52: #define nz_strx nlist.n_un.n_strx
! 53: #define nz_name nlist.n_un.n_name
! 54: #define nz_type nlist.n_type
! 55: #define nz_value nlist.n_value
! 56: #define nz_desc nlist.n_desc
! 57: #define nz_other nlist.n_other
! 58: };
! 59:
! 60: #define N_AUX(p) ((p)->n_other & 0xf)
! 61: #define N_BIND(p) (((unsigned int)(p)->n_other >> 4) & 0xf)
! 62: #define N_OTHER(r, v) (((unsigned int)(r) << 4) | ((v) & 0xf))
! 63:
! 64: #define AUX_OBJECT 1
! 65: #define AUX_FUNC 2
! 66: /*#define BIND_LOCAL 0 not used */
! 67: /*#define BIND_GLOBAL 1 not used */
! 68: #define BIND_WEAK 2
! 69:
! 70: /*
! 71: * The `section_dispatch_table' structure contains offsets to various data
! 72: * structures needed to do run-time relocation.
! 73: */
! 74: struct section_dispatch_table {
! 75: struct so_map *sdt_loaded; /* List of loaded objects */
! 76: long sdt_sods; /* List of shared objects descriptors */
! 77: long sdt_paths; /* Library search paths */
! 78: long sdt_got; /* Global offset table */
! 79: long sdt_plt; /* Procedure linkage table */
! 80: long sdt_rel; /* Relocation table */
! 81: long sdt_hash; /* Symbol hash table */
! 82: long sdt_nzlist; /* Symbol table itself */
! 83: long sdt_filler2; /* Unused (was: stab_hash) */
! 84: long sdt_buckets; /* Number of hash buckets */
! 85: long sdt_strings; /* Symbol strings */
! 86: long sdt_str_sz; /* Size of symbol strings */
! 87: long sdt_text_sz; /* Size of text area */
! 88: long sdt_plt_sz; /* Size of procedure linkage table */
! 89: };
! 90:
! 91: /*
! 92: * RRS symbol hash table, addressed by `sdt_hash' in section_dispatch_table.
! 93: * Used to quickly lookup symbols of the shared object by hashing
! 94: * on the symbol's name. `rh_symbolnum' is the index of the symbol
! 95: * in the shared object's symbol list (`sdt_nzlist'), `rh_next' is
! 96: * the next symbol in the hash bucket (in case of collisions).
! 97: */
! 98: struct rrs_hash {
! 99: int rh_symbolnum; /* Symbol number */
! 100: int rh_next; /* Next hash entry */
! 101: };
! 102:
! 103: /*
! 104: * `rt_symbols' is used to keep track of run-time allocated commons
! 105: * and data items copied from shared objects.
! 106: */
! 107: struct rt_symbol {
! 108: struct nzlist *rt_sp; /* The symbol */
! 109: struct rt_symbol *rt_next; /* Next in linear list */
! 110: struct rt_symbol *rt_link; /* Next in bucket */
! 111: caddr_t rt_srcaddr; /* Address of "master" copy */
! 112: struct so_map *rt_smp; /* Originating map */
! 113: };
! 114:
! 115: /*
! 116: * Debugger interface structure.
! 117: */
! 118: struct so_debug {
! 119: int dd_version; /* Version # of interface */
! 120: int dd_in_debugger; /* Set when run by debugger */
! 121: int dd_sym_loaded; /* Run-time linking brought more
! 122: symbols into scope */
! 123: char *dd_bpt_addr; /* Address of rtld-generated bpt */
! 124: int dd_bpt_shadow; /* Original contents of bpt */
! 125: struct rt_symbol *dd_cc; /* Allocated commons/copied data */
! 126: };
! 127:
! 128: /*
! 129: * Entry points into ld.so - user interface to the run-time linker.
! 130: */
! 131: struct ld_entry {
! 132: void *(*dlopen)(const char *, int);
! 133: int (*dlclose)(void *);
! 134: void *(*dlsym)(void *, const char *);
! 135: int (*dlctl)(void *, int, void *);
! 136: void (*dlexit)(void);
! 137: void (*dlrsrvd[3])(void);
! 138: };
! 139:
! 140: /*
! 141: * This is the structure pointed at by the __DYNAMIC symbol if an
! 142: * executable requires the attention of the run-time link editor.
! 143: * __DYNAMIC is given the value zero if no run-time linking needs to
! 144: * be done (it is always present in shared objects).
! 145: * The union `d_un' provides for different versions of the dynamic
! 146: * linking mechanism (switched on by `d_version'). The last version
! 147: * used by Sun is 3. We leave some room here and go to version number
! 148: * 8 for NetBSD, the main difference lying in the support for the
! 149: * `nz_list' type of symbols.
! 150: */
! 151:
! 152: struct _dynamic {
! 153: int d_version; /* version # of this interface */
! 154: struct so_debug *d_debug;
! 155: union {
! 156: struct section_dispatch_table *d_sdt;
! 157: } d_un;
! 158: struct ld_entry *d_entry; /* compat - now in crt_ldso */
! 159: };
! 160:
! 161: #define LD_VERSION_SUN (3)
! 162: #define LD_VERSION_BSD (8)
! 163: #define LD_VERSION_NZLIST_P(v) ((v) >= 8)
! 164:
! 165: #define LD_GOT(x) ((x)->d_un.d_sdt->sdt_got)
! 166: #define LD_PLT(x) ((x)->d_un.d_sdt->sdt_plt)
! 167: #define LD_REL(x) ((x)->d_un.d_sdt->sdt_rel)
! 168: #define LD_SYMBOL(x) ((x)->d_un.d_sdt->sdt_nzlist)
! 169: #define LD_HASH(x) ((x)->d_un.d_sdt->sdt_hash)
! 170: #define LD_STRINGS(x) ((x)->d_un.d_sdt->sdt_strings)
! 171: #define LD_NEED(x) ((x)->d_un.d_sdt->sdt_sods)
! 172: #define LD_BUCKETS(x) ((x)->d_un.d_sdt->sdt_buckets)
! 173: #define LD_PATHS(x) ((x)->d_un.d_sdt->sdt_paths)
! 174:
! 175: #define LD_GOTSZ(x) ((x)->d_un.d_sdt->sdt_plt - (x)->d_un.d_sdt->sdt_got)
! 176: #define LD_RELSZ(x) ((x)->d_un.d_sdt->sdt_hash - (x)->d_un.d_sdt->sdt_rel)
! 177: #define LD_HASHSZ(x) ((x)->d_un.d_sdt->sdt_nzlist - (x)->d_un.d_sdt->sdt_hash)
! 178: #define LD_STABSZ(x) ((x)->d_un.d_sdt->sdt_strings - (x)->d_un.d_sdt->sdt_nzlist)
! 179: #define LD_PLTSZ(x) ((x)->d_un.d_sdt->sdt_plt_sz)
! 180: #define LD_STRSZ(x) ((x)->d_un.d_sdt->sdt_str_sz)
! 181: #define LD_TEXTSZ(x) ((x)->d_un.d_sdt->sdt_text_sz)
! 182:
! 183: /*
! 184: * Interface to ld.so
! 185: */
! 186: struct crt_ldso {
! 187: int crt_ba; /* Base address of ld.so */
! 188: int crt_dzfd; /* "/dev/zero" file descriptor (SunOS) */
! 189: int crt_ldfd; /* ld.so file descriptor */
! 190: struct _dynamic *crt_dp; /* Main's __DYNAMIC */
! 191: char **crt_ep; /* environment strings */
! 192: caddr_t crt_bp; /* Breakpoint if run from debugger */
! 193: char *crt_prog; /* Program name (v3) */
! 194: char *crt_ldso; /* Link editor name (v4) */
! 195: struct ld_entry *crt_ldentry; /* dl*() access (v4) */
! 196: };
! 197:
! 198: /*
! 199: * Version passed from crt0 to ld.so (1st argument to _rtld()).
! 200: */
! 201: #define CRT_VERSION_SUN 1
! 202: #define CRT_VERSION_BSD_2 2
! 203: #define CRT_VERSION_BSD_3 3
! 204: #define CRT_VERSION_BSD_4 4
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