/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved. */ #ifndef _A_DOT_OUT_DOT_H #define _A_DOT_OUT_DOT_H #include #include #include #include #include <_rtld.h> #ifdef __cplusplus extern "C" { #endif #define max(a, b) ((a) < (b) ? (b) : (a)) typedef struct link_dynamic Link_dynamic; /* * Extern functions for a.out format file class. */ extern ulong_t aout_bndr(caddr_t); extern int aout_get_mmap(Lm_list *, mmapobj_result_t *); extern int aout_lookup_sym(Slookup *, Sresult *, uint_t *, int *); extern Rt_map *aout_new_lmp(Lm_list *, Aliste, Fdesc *, Addr, size_t, void *, Rt_map *, int *); extern void aout_plt_write(caddr_t, ulong_t); extern int aout_reloc(Rt_map *, uint_t, int *, APlist **); extern void aout_rtbndr(caddr_t); extern Fct *aout_verify(caddr_t, size_t, Fdesc *, const char *, Rej_desc *); /* * Private data for an a.out format file class. */ typedef struct _rt_aout_private { struct link_dynamic *lm_ld; /* 4.x aout dynamic pointer */ struct ld_private *lm_lpd; /* private aout object area */ } Rt_aoutp; /* * Special defines for a.out format file class. */ #define N_UNDF 0x0 /* undefined */ #define N_ABS 0x2 /* absolute */ #define N_COMM 0x12 /* common (internal to ld) */ #define N_EXT 01 /* external bit, or'ed in */ /* * Format of a symbol table entry. */ struct nlist { union { char *n_name; /* for use when in-core */ long n_strx; /* index into file string table */ } n_un; uchar_t n_type; /* type flag (N_TEXT,..) */ char n_other; /* unused */ short n_desc; /* see */ ulong_t n_value; /* value of symbol (or sdb offset) */ }; /* * Link editor public definitions. */ #ifndef _link_h #define _link_h /* * Structure describing logical name and requirements on an object * which is to be loaded dynamically. */ struct old_link_object { char *lo_name; /* name of object */ int lo_library : 1, /* searched for by library rules */ lo_unused : 31; short lo_major; /* major version number */ short lo_minor; /* minor version number */ }; struct link_object { long lo_name; /* name (often relative) */ 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) */ }; typedef struct link_object Lnk_obj; /* * Structure describing name and placement of dynamically loaded * objects in a process' address space. */ typedef struct a_link_map A_link_map; struct a_link_map { caddr_t lm_addr; /* address at which object mapped */ char *lm_name; /* full name of loaded object */ struct a_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 */ int lm_rwt : 1; /* text is read/write */ struct link_dynamic *lm_ld; /* dynamic structure */ caddr_t lm_lpd; /* loader private data */ }; /* * Version 1 of dynamic linking information. With the exception of * ld_loaded (determined at execution time) and ld_stab_hash (a special * case of relocation handled at execution time), the values in this * structure reflect offsets from the containing link_dynamic structure. */ struct link_dynamic_1 { struct a_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_stab; /* symbol table itself */ long (*ld_stab_hash)(); /* "pointer" to symbol hash function */ long ld_buckets; /* number of hash buckets */ long ld_symbols; /* symbol strings */ long ld_symb_size; /* size of symbol strings */ long ld_text; /* size of text area */ }; struct link_dynamic_2 { struct a_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_stab; /* symbol table itself */ long (*ld_stab_hash)(); /* "pointer" to symbol hash function */ long ld_buckets; /* number of hash buckets */ long ld_symbols; /* symbol strings */ long ld_symb_size; /* size of symbol strings */ long ld_text; /* size of text area */ long ld_plt_sz; /* size of procedure linkage table */ }; /* * Structure pointing to run time allocated common symbols and * its string. */ struct rtc_symb { struct nlist *rtc_sp; /* symbol for common */ struct rtc_symb *rtc_next; /* next common */ }; /* * 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 rtc_symb *ldd_cp; /* commons we built */ }; /* * Structure associated with each object which may be or which requires * execution-time link editing. Used by the run-time linkage editor to * identify needed objects and symbol definitions and references. */ struct old_link_dynamic { int ld_version; /* version # of this structure */ union { struct link_dynamic_1 ld_1; } ld_un; int in_debugging; int sym_loaded; char *bp_addr; int bp_inst; struct rtc_symb *cp; /* pointer to an array of runtime */ /* allocated common symbols. */ }; struct link_dynamic { int ld_version; /* version # of this structure */ struct ld_debug *ldd; union { struct link_dynamic_1 *ld_1; struct link_dynamic_2 *ld_2; } ld_un; }; /* * Get size of relocations. */ #define GETGOTSZ(x) (x->ld_version < 2 ? \ ((struct old_link_dynamic *)x)->v1.ld_plt - \ ((struct old_link_dynamic *)x)->v1.ld_got : \ (x)->v2->ld_plt - (x)->v2->ld_got) #define GETPLTSZ(x) (x->ld_version < 2 ? \ ((struct old_link_dynamic *)x)->v1.ld_rel - \ ((struct old_link_dynamic *)x)->v1.ld_plt : \ (x)->v2->ld_rel - (x)->v2->ld_plt) #define GETRELSZ(x) (x->ld_version < 2 ? \ ((struct old_link_dynamic *)x)->v1.ld_hash - \ ((struct old_link_dynamic *)x)->v1.ld_rel : \ (x)->v2->ld_hash - (x)->v2->ld_rel) #define GETHASHSZ(x) (x->ld_version < 2 ? \ ((struct old_link_dynamic *)x)->v1.ld_stab - \ ((struct old_link_dynamic *)x)->v1.ld_hash : \ (x)->v2->ld_stab - (x)->v2->ld_hash) #define GETSTABSZ(x) (x->ld_version < 2 ? \ ((struct old_link_dynamic *)x)->v1.ld_symbols -\ ((struct old_link_dynamic *)x)->v1.ld_stab : \ (x)->v2->ld_symbols - (x)->v2->ld_stab) #undef v2 #undef v1 #endif /* !_link_h */ #define MAIN_BASE 0x2000 /* base address of a.out in 4.x system */ /* * Macros for getting to linker a.out format private data. */ #define AOUTPRV(X) ((X)->rt_priv) #define AOUTDYN(X) (((Rt_aoutp *)(X)->rt_priv)->lm_ld) #define LM2LP(X) ((struct ld_private *)((Rt_aoutp *) \ (X)->rt_priv)->lm_lpd) #define TEXTBASE(X) (LM2LP(X)->lp_textbase) /* * Most of the above macros are used from AOUT specific routines, however there * are a couple of instances where we need to ensure the file being processed * is AOUT before dereferencing the macro. */ #define THIS_IS_AOUT(X) (FCT(X) == &aout_fct) /* * Code collapsing macros. */ #define v2 ld_un.ld_2 #define v1 ld_un.ld_1 #define JMPOFF(x) (x)->v2->ld_plt #define RELOCOFF(x) (x)->v2->ld_rel #define HASHOFF(x) (x)->v2->ld_hash #define SYMOFF(x) (x)->v2->ld_stab #define STROFF(x) (x)->v2->ld_symbols struct jbind { int jb_inst[3]; /* need 4 instructions for jump slot */ }; struct fshash { int fssymbno; /* ordinal symbol number */ int next; /* index to the hash array pointed by fs_hash */ }; /* * Sparc relocation types. */ enum reloc_type { RELOC_8, RELOC_16, RELOC_32, /* simplest relocs */ RELOC_DISP8, RELOC_DISP16, RELOC_DISP32, /* Disp's (pc-rel) */ RELOC_WDISP30, RELOC_WDISP22, /* SR word disp's */ RELOC_HI22, RELOC_22, /* SR 22-bit relocs */ RELOC_13, RELOC_LO10, /* SR 13&10-bit reloc */ RELOC_SFA_BASE, RELOC_SFA_OFF13, /* SR S.F.A. relocs */ RELOC_BASE10, RELOC_BASE13, RELOC_BASE22, /* base_relative pic */ RELOC_PC10, RELOC_PC22, /* special pc-rel pic */ RELOC_JMP_TBL, /* jmp_tbl_rel in pic */ RELOC_SEGOFF16, /* Shlib off-in-seg */ RELOC_GLOB_DAT, RELOC_JMP_SLOT, RELOC_RELATIVE /* rtld relocs */ }; /* * Format of a relocation datum. */ #define r_symbolnum r_index struct relocation_info /* used when header.a_machtype == M_SPARC */ { ulong_t r_address; /* relocation addr (offset in seg) */ uint_t r_index :24; /* segment index or symbol index */ uint_t r_extern : 1; /* if F, r_index==SEG#; if T, SYM idx */ int : 2; /* */ enum reloc_type r_type : 5; /* type of relocation to perform */ long r_addend; /* addend for relocation value */ }; struct ld_private { struct jbind *lp_plt; /* procedure linkage table */ struct relocation_info *lp_rp; /* relocation table */ struct fshash *lp_hash; /* hash table */ struct nlist *lp_symtab; /* symbol table */ char *lp_symstr; /* symbol strings */ caddr_t lp_textbase; /* base address for text addressing */ struct nlist *(*lp_interp)(); /* link map interpreter */ long lp_refcnt; /* reference count of link map */ struct dl_object *lp_dlp; /* pointer to a dlopen object */ caddr_t lp_symbol_base; /* base address for symbols */ }; /* * Offsets of various sections of an object file. */ #define PAGSIZ 0x02000 #define SEGSIZ PAGSIZ #define N_TXTOFF(x) \ /* text segment */ \ ((x).a_magic == ZMAGIC ? 0 : sizeof (struct exec)) #define N_SYMOFF(x) \ /* symbol table */ \ (N_TXTOFF(x) + (x).a_text + (x).a_data + (x).a_trsize + (x).a_drsize) #define SIZE(x) \ /* round to segment size */ \ (M_SROUND((x).a_text) + (x).a_data + (x).a_bss) #ifdef __cplusplus } #endif #endif /* _A_DOT_OUT_DOT_H */