xserver/hw/xfree86/loader/loader.h

/* $XFree86: xc/programs/Xserver/hw/xfree86/loader/loader.h,v 1.28 2003/11/06 18:38:14 tsi Exp $ */

/*
 *
 * Copyright 1995-1998 by Metro Link, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Metro Link, Inc. not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Metro Link, Inc. makes no
 * representations about the suitability of this software for any purpose.
 *  It is provided "as is" without express or implied warranty.
 *
 * METRO LINK, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL METRO LINK, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
/*
 * Copyright (c) 1997-2001 by The XFree86 Project, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */

#ifndef _LOADER_H
#define _LOADER_H

#include "sym.h"

#if defined(Lynx) && defined(sun)
#define const /**/
#endif
#if (defined(__i386__) || defined(__ix86)) && !defined(i386)
#define i386
#endif
#include <X11/Xosdefs.h>
#include <X11/Xfuncproto.h>
#include <X11/Xmd.h>
/* For LOOKUP definition */
#include "sym.h"
#define LD_UNKNOWN	-1
#define LD_ARCHIVE	0
#define LD_ELFOBJECT	1
#define LD_COFFOBJECT	2
#define LD_XCOFFOBJECT	3
#define LD_AOUTOBJECT   4
#define LD_AOUTDLOBJECT	5
#define LD_ELFDLOBJECT	6
#define LD_PROCESSED_ARCHIVE -1
/* #define UNINIT_SECTION */
#define HANDLE_IN_HASH_ENTRY
/*
 * COFF Section nmumbers
 */
#define N_TEXT       1
#define N_DATA       2
#define N_BSS        3
#define N_COMMENT    4
#define TestFree(a) if (a) { xfree (a); a = NULL; }
#define HASHDIV 10
#define HASHSIZE (1<<HASHDIV)
typedef struct _elf_reloc *ELFRelocPtr;
typedef struct _elf_COMMON *ELFCommonPtr;
typedef struct _coff_reloc *COFFRelocPtr;
typedef struct _coff_COMMON *COFFCommonPtr;
typedef struct AOUT_RELOC *AOUTRelocPtr;
typedef struct AOUT_COMMON *AOUTCommonPtr;

typedef struct _LoaderReloc {
    int modtype;
    struct _LoaderReloc *next;
    COFFRelocPtr coff_reloc;
    ELFRelocPtr elf_reloc;
    AOUTRelocPtr aout_reloc;
} LoaderRelocRec, *LoaderRelocPtr;

typedef struct _loader_item *itemPtr;
typedef struct _loader_item {
    char *name;
    void *address;
    itemPtr next;
    int handle;
    int module;
    itemPtr exports;
#if defined(__powerpc__)
    /*
     * PowerPC file formats require special routines in some circumstances
     * to assist in the linking process. See the specific loader for
     * more details.
     */
    union {
	unsigned short plt[8];	/* ELF */
	unsigned short glink[14];	/* XCOFF */
    } code;
#endif
} itemRec;

/* The following structures provide an interface to GDB (note that GDB
   has copies of the definitions - if you change anything here make
   sure that the changes are also made to GDB */

typedef struct {
    char *name;			/* Name of this symbol */
    unsigned int namelen;	/* Name of this module */
    void *addr;			/* Start address of the .text section */
} LDRCommon, *LDRCommonPtr;

typedef struct x_LDRModuleRec {
    unsigned int version;	/* Version of this struct */
    char *name;			/* Name of this module */
    unsigned int namelen;	/* Length of name */
    void *text;			/* Start address of the .text section */
    void *data;			/* Start address of the .data section */
    void *rodata;		/* Start address of the .rodata section */
    void *bss;			/* Start address of the .bss section */
    LDRCommonPtr commons;	/* List of commmon symbols */
    int commonslen;		/* Number of common symbols */
    struct x_LDRModuleRec *next;	/* Next module record in chain */
} LDRModuleRec, *LDRModulePtr;

extern char DebuggerPresent;
extern LDRModulePtr ModList;
extern LDRCommonPtr ldrCommons;
extern int nCommons;

/*
 * The loader uses loader specific alloc/calloc/free functions that
 * are mapped to either to the regular Xserver functions, or in a couple
 * of special cases, mapped to the C library functions.
 */
#if !defined(PowerMAX_OS) && !(defined(linux) && (defined(__alpha__) || defined(__powerpc__) || defined(__ia64__))) && 0
#define xf86loadermalloc(size) xalloc(size)
#define xf86loaderrealloc(ptr,size) xrealloc(ptr,size)
#define xf86loadercalloc(num,size) xcalloc(num,size)
#define xf86loaderfree(ptr) xfree(ptr)
#define xf86loaderstrdup(ptr) xstrdup(ptr)
#else
/*
 * On Some OSes, xalloc() et al uses mmap to allocate space for large
 * allocation. This has the effect of placing the text section of some
 * modules very far away from the rest which are placed on the heap.
 * Certain relocations are limited in the size of the offsets that can be
 * handled, and this seperation causes these relocation to overflow. This
 * is fixed by just using the C library allocation functions for the loader
 * to ensure that all text sections are located on the heap. OSes that have
 * this problem are:
 *	PowerMAX_OS/PPC
 * 	Linux/Alpha
 * 	Linux/PPC
 *	Linux/IA-64
 */
#define xf86loadermalloc(size) malloc(size)
#define xf86loaderrealloc(ptr,size) realloc(ptr,size)
#define xf86loadercalloc(num,size) calloc(num,size)
#define xf86loaderfree(ptr) free(ptr)
#define xf86loaderstrdup(ptr) strdup(ptr)
#endif

typedef struct _loader *loaderPtr;

/*
 * _loader_funcs hold the entry points for a module format.
 */

typedef void *(*LoadModuleProcPtr) (loaderPtr modrec, int fd, LOOKUP **);
typedef void (*ResolveSymbolsProcPtr) (void *);
typedef int (*CheckForUnresolvedProcPtr) (void *);
typedef char *(*AddressToSectionProcPtr) (void *, unsigned long);
typedef void (*LoaderUnloadProcPtr) (void *);

typedef struct _loader_funcs {
    LoadModuleProcPtr LoadModule;
    ResolveSymbolsProcPtr ResolveSymbols;
    CheckForUnresolvedProcPtr CheckForUnresolved;
    AddressToSectionProcPtr AddressToSection;
    LoaderUnloadProcPtr LoaderUnload;
    LoaderRelocRec pRelocs;	/* type specific relocations */
} loader_funcs;

/* Each module loaded has a loaderRec */
typedef struct _loader {
    int handle;			/* Unique id used to remove symbols from
				 * this module when it is unloaded */
    int module;			/* Unique id to identify compilation units */
    char *name;
    char *cname;
    void *private;		/* format specific data */
    loader_funcs *funcs;	/* funcs for operating on this module */
    loaderPtr next;
} loaderRec;

/* Compiled-in version information */
typedef struct {
    int xf86Version;
    int ansicVersion;
    int videodrvVersion;
    int xinputVersion;
    int extensionVersion;
    int fontVersion;
} ModuleVersions;
extern ModuleVersions LoaderVersionInfo;

extern unsigned long LoaderOptions;

/* Internal Functions */

void LoaderAddSymbols(int, int, LOOKUP *);
void LoaderDefaultFunc(void);
void LoaderDuplicateSymbol(const char *, const int);

#if 0
void LoaderFixups(void);
#endif
void LoaderResolve(void);
int LoaderResolveSymbols(void);
int _LoaderHandleUnresolved(char *, char *);
void LoaderHashAdd(itemPtr);
itemPtr LoaderHashDelete(const char *);
itemPtr LoaderHashFind(const char *);
void LoaderHashTraverse(void *, int (*)(void *, itemPtr));
void LoaderPrintAddress(const char *);
void LoaderPrintItem(itemPtr);
void LoaderPrintSymbol(unsigned long);
void LoaderDumpSymbols(void);
char *_LoaderModuleToName(int);
int _LoaderAddressToSection(const unsigned long, const char **,
			    const char **);
int LoaderOpen(const char *, const char *, int, int *, int *, int *);
int LoaderHandleOpen(int);

/*
 * File interface functions
 */
void *_LoaderFileToMem(int fd, unsigned long offset, int size, char *label);
void _LoaderFreeFileMem(void *addr, int size);
int _LoaderFileRead(int fd, unsigned int offset, void *addr, int size);

/*
 * Relocation list manipulation routines
 */
LoaderRelocPtr _LoaderGetRelocations(void *);

/*
 * object to name lookup routines
 */
char *_LoaderHandleToName(int handle);
char *_LoaderHandleToCanonicalName(int handle);

/*
 * Entry points for the different loader types
 */
#include "aoutloader.h"
#include "coffloader.h"
#include "elfloader.h"
#include "dlloader.h"
/* LD_ARCHIVE */
void *ARCHIVELoadModule(loaderPtr, int, LOOKUP **);

extern void _loader_debug_state(void);

#endif /* _LOADER_H */