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/*
* This file is part of ltrace.
* Copyright (C) 2012 Petr Machata, Red Hat Inc.
* Copyright (C) 2006 Paul Gilliam
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef _LIBRARY_H_
#define _LIBRARY_H_
#include <stdint.h>
#include "sysdep.h"
struct Process;
struct library;
enum toplt {
LS_TOPLT_NONE = 0, /* PLT not used for this symbol. */
LS_TOPLT_EXEC, /* PLT for this symbol is executable. */
};
/* Dict interface. */
unsigned int target_address_hash(const void *key);
int target_address_cmp(const void *key1, const void *key2);
struct library_symbol {
struct library_symbol *next;
struct library *lib;
const char *name;
arch_addr_t enter_addr;
enum toplt plt_type;
char own_name;
struct arch_library_symbol_data arch;
};
/* Init LIBSYM. NAME will be freed when LIBSYM is destroyed if
* OWN_NAME. ARCH has to be initialized by a separate call. */
int library_symbol_init(struct library_symbol *libsym,
arch_addr_t addr, const char *name, int own_name,
enum toplt type_of_plt);
/* Copy library symbol SYM into the area pointed-to by RETP. Return 0
* on success or a negative value on failure. */
int library_symbol_clone(struct library_symbol *retp,
struct library_symbol *sym);
/* Destroy library symbol. This essentially just frees name if it's
* owned. It doesn't free the memory associated with SYM pointer
* itself. Returns 0 on success or a negative value in case of an
* error (which would be an out of memory condition). */
void library_symbol_destroy(struct library_symbol *sym);
/* Compare two library symbols. Returns a negative value, 0, or a
* positive value, much like strcmp. The function compares symbol
* addresses, and if those are equal, it compares symbol names. If
* those are equal, too, the symbols are considered equal. */
int library_symbol_cmp(struct library_symbol *a, struct library_symbol *b);
/* Set a name for library symbol. This frees the old name, if
* that is owned. */
void library_symbol_set_name(struct library_symbol *libsym,
const char *name, int own_name);
/* A function that can be used as library_each_symbol callback. Looks
* for a symbol SYM for which library_symbol_cmp(SYM, STANDARD)
* returns 0. */
enum callback_status library_symbol_equal_cb(struct library_symbol *libsym,
void *standard);
enum library_type {
LT_LIBTYPE_MAIN,
LT_LIBTYPE_DSO,
};
/* XXX we might consider sharing libraries across processes. Things
* like libc will be opened by every single process, no point cloning
* these everywhere. But for now, keep the ownership structure
* simple. */
struct library {
struct library *next;
/* Unique key. Two library objects are considered equal, if
* they have the same key. */
arch_addr_t key;
/* Address where the library is mapped. Two library objects
* are considered equal, if they have the same base. */
arch_addr_t base;
/* Absolute address of the entry point. Useful for main
* binary, though I suppose the value might be useful for the
* dynamic linker, too (in case we ever want to do early
* process tracing). */
arch_addr_t entry;
/* Address of PT_DYNAMIC segment. */
arch_addr_t dyn_addr;
/* Symbols associated with the library. */
struct library_symbol *symbols;
const char *soname;
const char *pathname;
enum library_type type;
char own_soname : 1;
char own_pathname : 1;
struct arch_library_data arch;
};
/* Init LIB. */
void library_init(struct library *lib, enum library_type type);
/* Initialize RETP to a library identical to LIB. Symbols are not
* shared, but copied over. Returns 0 on success and a negative value
* in case of failure. */
int library_clone(struct library *retp, struct library *lib);
/* Destroy library. Doesn't free LIB itself. Symbols are destroyed
* and freed. */
void library_destroy(struct library *lib);
/* Set library soname. Frees the old name if necessary. */
void library_set_soname(struct library *lib,
const char *new_name, int own_name);
/* Set library pathname. Frees the old name if necessary. */
void library_set_pathname(struct library *lib,
const char *new_name, int own_name);
/* Iterate through list of symbols of library LIB. Restarts are
* supported via START_AFTER (see each_process for details of
* iteration interface). */
struct library_symbol *library_each_symbol
(struct library *lib, struct library_symbol *start_after,
enum callback_status (*cb)(struct library_symbol *, void *),
void *data);
/* Add a new symbol SYM to LIB. SYM is assumed owned, we need to
* overwrite SYM->next. */
void library_add_symbol(struct library *lib, struct library_symbol *sym);
/* A function that can be used as proc_each_library callback. Looks
* for a library with the name passed in DATA. PROC is ignored. */
enum callback_status library_named_cb(struct Process *proc,
struct library *lib, void *name);
/* A function that can be used as proc_each_library callback. Looks
* for a library with given base.
*
* NOTE: The key is passed as a POINTER to arch_addr_t (that
* because in general, arch_addr_t doesn't fit in void*). */
enum callback_status library_with_key_cb(struct Process *proc,
struct library *lib, void *keyp);
/* XXX this should really be in backend.h (as on pmachata/revamp
* branch), or, on this branch, in common.h. But we need
* arch_addr_t (which should also be in backend.h, I reckon), so
* stuff it here for the time being. */
/* This function is implemented in the back end. It is called for all
* raw addresses as read from symbol tables etc. If necessary on
* given architecture, this function should translate the address
* according to .opd or other indirection mechanism. Returns 0 on
* success and a negative value on failure. */
struct ltelf;
int arch_translate_address(struct ltelf *lte,
arch_addr_t addr, arch_addr_t *ret);
/* This is the same function as arch_translate_address, except it's
* used at the point that we don't have ELF available anymore. */
int arch_translate_address_dyn(struct Process *proc,
arch_addr_t addr, arch_addr_t *ret);
#endif /* _LIBRARY_H_ */
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