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mips_reloc.c revision 1.2 
      1 /*	$NetBSD: mips_reloc.c,v 1.2 1999/10/25 13:57:12 kleink Exp $	*/
      2 
      3 /*
      4  * Copyright 1997 Michael L. Hitch <mhitch (at) montana.edu>
      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  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 
     31 #include <stdarg.h>
     32 #include <sys/types.h>
     33 
     34 #include "debug.h"
     35 #include "rtld.h"
     36 
     37 /*
     38  * Relocate a MIPS GOT
     39  */
     40 
     41 void
     42 _rtld_relocate_mips_got(obj)
     43 	Obj_Entry *obj;
     44 {
     45 	Elf_Addr *got = obj->pltgot;
     46 	const Elf_Sym *sym = obj->symtab;
     47 	const Elf_Sym *def;
     48 	const Obj_Entry *defobj;
     49 	int i;
     50 
     51 	i = (got[1] & 0x80000000) ? 2 : 1;
     52 	/* Relocate the local GOT entries */
     53 	while (i < obj->local_gotno)
     54 		got[i++] += (Elf_Word)obj->relocbase;
     55 	got += obj->local_gotno;
     56 	i = obj->symtabno - obj->gotsym;
     57 	sym += obj->gotsym;
     58 	/* Now do the global GOT entries */
     59 	while (i--) {
     60 		def = _rtld_find_symdef(_rtld_objlist, 0,
     61 		    sym->st_name + obj->strtab, obj, &defobj, true);
     62 		if (def != NULL) {
     63 			if (sym->st_shndx == SHN_UNDEF) {
     64 #if 0	/* These don't seem to work? */
     65 
     66 				if (ELFDEFNNAME(ST_TYPE)(sym->st_info) ==
     67 				    STT_FUNC) {
     68 					if (sym->st_value)
     69 						*got = sym->st_value +
     70 						    (Elf_Word)obj->relocbase;
     71 					else
     72 						*got = def->st_value +
     73 						    (Elf_Word)defobj->relocbase;
     74 				} else
     75 #endif
     76 					*got = def->st_value +
     77 					    (Elf_Word)defobj->relocbase;
     78 			} else if (sym->st_shndx == SHN_COMMON) {
     79 				*got = def->st_value +
     80 				    (Elf_Word)defobj->relocbase;
     81 			} else if (ELFDEFNNAME(ST_TYPE)(sym->st_info) ==
     82 			    STT_FUNC &&
     83 			    *got != sym->st_value) {
     84 				*got += (Elf_Word)obj->relocbase;
     85 			} else if (ELFDEFNNAME(ST_TYPE)(sym->st_info) ==
     86 			    STT_SECTION && ELFDEFNNAME(ST_BIND)(sym->st_info) ==
     87 			    STB_GLOBAL) {
     88 				if (sym->st_shndx == SHN_ABS)
     89 					*got = sym->st_value +
     90 					    (Elf_Word)obj->relocbase;
     91 				/* else SGI stuff ignored */
     92 			} else
     93 				*got = def->st_value +
     94 				    (Elf_Word)defobj->relocbase;
     95 		}
     96 		++sym;
     97 		++got;
     98 	}
     99 }
    100 
    101 /*
    102  * _rtld_bind_mips(symbol_index, return_address, old_gp, stub_return_addr)
    103  */
    104 
    105 caddr_t
    106 _rtld_bind_mips(a0, a1, a2, a3)
    107 	Elf_Word a0;
    108 	Elf_Addr a1, a2, a3;
    109 {
    110 	Elf_Addr *u = (Elf_Addr *)(a2 - 0x7ff0);
    111 	Obj_Entry *obj = (Obj_Entry *)(u[1] & 0x7fffffff);
    112 	const Elf_Sym *def;
    113 	const Obj_Entry *defobj;
    114 
    115 	def = _rtld_find_symdef(_rtld_objlist, a0 << 8, NULL, obj, &defobj,
    116 	    true);
    117 	if (def) {
    118 		u[obj->local_gotno + a0 - obj->gotsym] = (Elf_Addr)
    119 		    (def->st_value + defobj->relocbase);
    120 		return((caddr_t)(def->st_value + defobj->relocbase));
    121 	}
    122 
    123 	return(NULL);	/* XXX */
    124 }
    125