solib_depend.h

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	solib.h
 *
 *	Shared object (SO) support library
 */

#ifndef __SYS_SOLIB_DEPEND_H__
#define __SYS_SOLIB_DEPEND_H__

#include <basic.h>
#include <extension/dynload.h>
#include <sys/queue.h>
#include <sys/elf.h>


#ifdef __cplusplus
extern "C" {
#endif

typedef struct dlinfo	DLInfo;

/*
 * Symbol scope list
 */
typedef struct {
	W		nent;		/* Number of entries */
	DLInfo		**ent;		/* Target for search (variable-length array) */
} DLScope;

/*
 * Object management information
 */
struct dlinfo {
	QUEUE		q;		/* For management information connection */
	W		count;		/* Reference count */
	W		dllcount;	/* DLL loading count */
	VP		dllhandle;	/* DLL handle */
	SOBJ_HDR 	soHdr;		/* Shared object file */
	W		ldid;		/* Loading ID */
	P_DYNLDINF	ldinf;		/* Loading information */
	W		ldofs;		/* Loading offset */

	DLInfo		*loader;	/* First loaded (DLL) main */
	BOOL		global:1;	/* Global scope: True */
	BOOL		relocated:1;	/* Already relocated: True */
	BOOL		nowloading:1;	/* In process of loading: True */
	BOOL		initcalled:1;	/* init has been called: True */

	/* Loading object information */
	Elf32_Dyn	*dyn;		/* Dynamic section */
	VP		*got;		/* Global offset table
								DT_PLTGOT */
	Elf32_Rel	*reltab;	/* Relocation table DT_REL */
	UW		relsz;		/* Relocation table size DT_RELSZ */
	Elf32_Rela	*relatab;	/* Relocation table DT_RELA */
	UW		relasz;		/* Relocation table size DT_RELASZ */
	Elf32_Rel	*jreltab;	/* Relocation table DT_JMPREL */
	UW		jrelsz;		/* Relocation table size DT_PLTRELSZ */
	UB		*strtab;	/* String table	DT_STRTAB */
	Elf32_Sym	*symtab;	/* Symbol table	DT_SYMTAB */
	struct hash {			/* Hash table	DT_HASH */
		UW	nbucket;
		UW	*bucket;
		UW	*chain;
	} hash;
	FP		init;		/* Initialization routine	DT_INIT */
	FP		fini;		/* Termination processing routine	DT_FINI */

	/* Symbol search list */
	DLScope		search;		/* Dependent library */

	/* Symbol scope list */
	DLScope		*scope[4];	/* Standard scope */
	DLScope		*lscope[2];	/* Local scope */
};
IMPORT DLInfo	__dlInfo;

#define	DLInfoID(dlp)	( (UW)(dlp) >> 2 )	/* Access handle */

/*
 * Conversion from link address to loaded address
 *	VP LDADR( DLInfo *dlp, VP vp )
 */
#define	LDADR(dlp, vp)	( (VP)((UW)(vp) + (UW)(dlp)->ldofs) )

/*
 * Exclusive control for DLInfo access
 */
IMPORT ER	__so_lock( BOOL ignore_mintr );
IMPORT void	__so_unlock( void );

/*
 * solib entry
 */
IMPORT ER	__so_loading( DLInfo **dlpp, SOBJ_HDR *soHdr, DLInfo *loader );
IMPORT ER	__so_depsloading( DLInfo *loader, UW global );
IMPORT ER	__so_relocate( DLInfo *loader, UW lazy );
IMPORT void	__so_callinit( DLInfo *loader );
IMPORT void	__so_callfini( DLInfo *loader );
IMPORT UW	__so_resolve( DLInfo *dlp, UB *name, UW reltype, Elf32_Sym **sym );
IMPORT UW	__so_localresolve( DLInfo *dlp, UB *name, DLInfo *skip, Elf32_Sym **sym );
IMPORT void	__freeDLInfo( DLInfo *dlp );

#ifdef __cplusplus
}
#endif
#endif /* __SYS_SOLIB_DEPEND_H__ */