292 lines
8.4 KiB
C
292 lines
8.4 KiB
C
/*-
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* Copyright (c) 1997 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: linker.h,v 1.10 1998/11/04 15:20:58 peter Exp $
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*/
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#ifndef _SYS_LINKER_H_
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#define _SYS_LINKER_H_
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#ifdef KERNEL
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#include <machine/elf.h>
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_LINKER);
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#endif
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/*
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* Object representing a file which has been loaded by the linker.
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*/
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typedef struct linker_file* linker_file_t;
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typedef TAILQ_HEAD(, linker_file) linker_file_list_t;
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typedef caddr_t linker_sym_t; /* opaque symbol */
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/*
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* expanded out linker_sym_t
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*/
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typedef struct linker_symval {
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const char* name;
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caddr_t value;
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size_t size;
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} linker_symval_t;
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struct linker_file_ops {
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/*
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* Lookup a symbol in the file's symbol table. If the symbol is
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* not found then return ENOENT, otherwise zero. If the symbol
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* found is a common symbol, return with *address set to zero and
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* *size set to the size of the common space required. Otherwise
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* set *address the value of the symbol.
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*/
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int (*lookup_symbol)(linker_file_t, const char* name,
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linker_sym_t* sym);
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int (*symbol_values)(linker_file_t, linker_sym_t,
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linker_symval_t*);
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int (*search_symbol)(linker_file_t, caddr_t value,
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linker_sym_t* sym, long* diffp);
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/*
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* Unload a file, releasing dependancies and freeing storage.
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*/
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void (*unload)(linker_file_t);
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};
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struct common_symbol {
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STAILQ_ENTRY(common_symbol) link;
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char* name;
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caddr_t address;
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};
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struct linker_file {
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int refs; /* reference count */
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int userrefs; /* kldload(2) count */
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TAILQ_ENTRY(linker_file) link; /* list of all loaded files */
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char* filename; /* file which was loaded */
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int id; /* unique id */
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caddr_t address; /* load address */
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size_t size; /* size of file */
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int ndeps; /* number of dependancies */
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linker_file_t* deps; /* list of dependancies */
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STAILQ_HEAD(, common_symbol) common; /* list of common symbols */
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TAILQ_HEAD(, module) modules; /* modules in this file */
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void* priv; /* implementation data */
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struct linker_file_ops* ops;
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};
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/*
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* Object implementing a class of file (a.out, elf, etc.)
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*/
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typedef struct linker_class *linker_class_t;
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typedef TAILQ_HEAD(, linker_class) linker_class_list_t;
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struct linker_class_ops {
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/*
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* Load a file, returning the new linker_file_t in *result. If
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* the class does not recognise the file type, zero should be
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* returned, without modifying *result. If the file is
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* recognised, the file should be loaded, *result set to the new
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* file and zero returned. If some other error is detected an
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* appropriate errno should be returned.
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*/
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int (*load_file)(const char* filename, linker_file_t* result);
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};
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struct linker_class {
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TAILQ_ENTRY(linker_class) link; /* list of all file classes */
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const char* desc; /* description (e.g. "a.out") */
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void* priv; /* implementation data */
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struct linker_class_ops *ops;
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};
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/*
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* The file which is currently loading. Used to register modules with
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* the files which contain them.
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*/
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extern linker_file_t linker_current_file;
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/*
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* The "file" for the kernel.
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*/
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extern linker_file_t linker_kernel_file;
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/*
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* Add a new file class to the linker.
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*/
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int linker_add_class(const char* desc, void* priv,
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struct linker_class_ops* ops);
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/*
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* Load a file, trying each file class until one succeeds.
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*/
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int linker_load_file(const char* filename, linker_file_t* result);
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/*
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* Find a currently loaded file given its filename.
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*/
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linker_file_t linker_find_file_by_name(const char* filename);
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/*
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* Find a currently loaded file given its file id.
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*/
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linker_file_t linker_find_file_by_id(int fileid);
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/*
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* Called from a class handler when a file is laoded.
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*/
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linker_file_t linker_make_file(const char* filename, void* priv,
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struct linker_file_ops* ops);
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/*
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* Unload a file, freeing up memory.
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*/
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int linker_file_unload(linker_file_t file);
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/*
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* Add a dependancy to a file.
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*/
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int linker_file_add_dependancy(linker_file_t file, linker_file_t dep);
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/*
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* Lookup a symbol in a file. If deps is TRUE, look in dependancies
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* if not found in file.
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*/
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caddr_t linker_file_lookup_symbol(linker_file_t file, const char* name,
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int deps);
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/*
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* Search the linker path for the module. Return the full pathname in
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* a malloc'ed buffer.
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*/
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char *linker_search_path(const char *filename);
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/*
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* DDB Helpers, tuned specifically for ddb/db_kld.c
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*/
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int linker_ddb_lookup(char *symstr, linker_sym_t *sym);
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int linker_ddb_search_symbol(caddr_t value, linker_sym_t *sym, long *diffp);
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int linker_ddb_symbol_values(linker_sym_t sym, linker_symval_t *symval);
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#endif /* KERNEL */
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/*
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* Module information subtypes
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*/
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#define MODINFO_END 0x0000 /* End of list */
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#define MODINFO_NAME 0x0001 /* Name of module (string) */
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#define MODINFO_TYPE 0x0002 /* Type of module (string) */
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#define MODINFO_ADDR 0x0003 /* Loaded address */
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#define MODINFO_SIZE 0x0004 /* Size of module */
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#define MODINFO_EMPTY 0x0005 /* Has been deleted */
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#define MODINFO_METADATA 0x8000 /* Module-specfic */
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#define MODINFOMD_AOUTEXEC 0x0001 /* a.out exec header */
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#define MODINFOMD_ELFHDR 0x0002 /* ELF header */
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#define MODINFOMD_SSYM 0x0003 /* start of symbols */
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#define MODINFOMD_ESYM 0x0004 /* end of symbols */
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#define MODINFOMD_DYNAMIC 0x0005 /* _DYNAMIC pointer */
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#define MODINFOMD_NOCOPY 0x8000 /* don't copy this metadata to the kernel */
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#define MODINFOMD_DEPLIST (0x4001 | MODINFOMD_NOCOPY) /* depends on */
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#ifdef KERNEL
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/*
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* Module lookup
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*/
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extern caddr_t preload_metadata;
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extern caddr_t preload_search_by_name(const char *name);
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extern caddr_t preload_search_by_type(const char *type);
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extern caddr_t preload_search_next_name(caddr_t base);
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extern caddr_t preload_search_info(caddr_t mod, int inf);
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extern void preload_delete_name(const char *name);
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extern void preload_bootstrap_relocate(vm_offset_t offset);
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#ifdef KLD_DEBUG
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extern int kld_debug;
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#define KLD_DEBUG_FILE 1 /* file load/unload */
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#define KLD_DEBUG_SYM 2 /* symbol lookup */
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#define KLD_DPF(cat, args) \
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do { \
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if (kld_debug & KLD_DEBUG_##cat) printf args; \
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} while (0)
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#else
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#define KLD_DPF(cat, args)
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#endif
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/* Support functions */
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int elf_reloc(linker_file_t lf, const void *rel, int type, const char *sym);
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/* values for type */
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#define ELF_RELOC_REL 1
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#define ELF_RELOC_RELA 2
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#endif /* KERNEL */
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struct kld_file_stat {
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int version; /* set to sizeof(linker_file_stat) */
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char name[MAXPATHLEN];
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int refs;
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int id;
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caddr_t address; /* load address */
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size_t size; /* size in bytes */
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};
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struct kld_sym_lookup {
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int version; /* set to sizeof(struct kld_sym_lookup) */
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char *symname; /* Symbol name we are looking up */
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u_long symvalue;
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size_t symsize;
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};
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#define KLDSYM_LOOKUP 1
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#ifndef KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int kldload(const char* file);
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int kldunload(int fileid);
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int kldfind(const char* file);
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int kldnext(int fileid);
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int kldstat(int fileid, struct kld_file_stat* stat);
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int kldfirstmod(int fileid);
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int kldsym(int _fileid, int _cmd, void *_data);
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__END_DECLS
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#endif
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#endif /* !_SYS_LINKER_H_ */
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