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      1 /*	$NetBSD: kobj_machdep.c,v 1.6 2023/04/29 10:01:51 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.6 2023/04/29 10:01:51 skrll Exp $");
     31 
     32 #define	ELFSIZE		ARCH_ELFSIZE
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/kobj.h>
     37 #include <sys/exec.h>
     38 #include <sys/exec_elf.h>
     39 
     40 int
     41 kobj_reloc(kobj_t ko, uintptr_t relocbase, const void *data,
     42 	   bool isrela, bool local)
     43 {
     44 	Elf_Addr *where;
     45 	uintptr_t addr, tmp;
     46 	int rtype, symnum;
     47 	const Elf_Rela *rela;
     48 	int error;
     49 
     50 	if (!isrela) {
     51 		printf("kobj_reloc: support only RELA relocations\n");
     52 		return -1;
     53 	}
     54 
     55 	rela = data;
     56 	where = (Elf_Addr *)(relocbase + rela->r_offset);
     57 	symnum = ELF_R_SYM(rela->r_info);
     58 	rtype = ELF_R_TYPE(rela->r_info);
     59 
     60 	const Elf_Sym *sym = kobj_symbol(ko, symnum);
     61 
     62 	if (!local && ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
     63 		return 0;
     64 	}
     65 
     66 	switch (rtype) {
     67 	case R_TYPE(NONE):
     68 		break;
     69 
     70 	case R_TYPE(PC32):
     71 		error = kobj_sym_lookup(ko, symnum, &addr);
     72 		if (error)
     73 			return -1;
     74 		tmp = (Elf_Addr)(addr + rela->r_addend) - (Elf_Addr)where;
     75 		if (*where != tmp)
     76 			*where = tmp;
     77 		break;
     78 
     79 	case R_TYPE(32):
     80 	case R_TYPE(GLOB_DAT):
     81 		error = kobj_sym_lookup(ko, symnum, &addr);
     82 		if (error)
     83 			return -1;
     84 		tmp = (Elf_Addr)(addr + *where + rela->r_addend);
     85 		*where = tmp;
     86 		break;
     87 
     88 	case R_TYPE(RELATIVE):
     89 		*where += (Elf_Addr)(relocbase + rela->r_addend);
     90 		break;
     91 
     92 	default:
     93 		printf("kobj_reloc: unexpected relocation type %d\n",
     94 		    (int)rtype);
     95 		return -1;
     96 	}
     97 
     98 	return 0;
     99 }
    100 
    101 int
    102 kobj_machdep(kobj_t ko, void *base, size_t size, bool load)
    103 {
    104 
    105 	return 0;
    106 }
    107