WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/rtld/arch/ia32/src/reloc.c


/*
 * Copyright (c) 2008 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup rtld rtld
 * @brief
 * @{
 */
/**
 * @file
 */
 
#include <stdio.h>
 
#include <arch.h>
#include <elf_dyn.h>
#include <symbol.h>
#include <rtld.h>
 
/**
 * Process (fixup) all relocations in a relocation table.
 */
void rel_table_process(module_t *m, elf_rel_t *rt, size_t rt_size)
{
    int i;
 
    size_t rt_entries;
    size_t r_offset;
    elf_word r_info;
    unsigned rel_type;
    elf_word sym_idx;
    uintptr_t sym_addr;
   
    elf_symbol_t *sym_table;
    elf_symbol_t *sym;
    uint32_t *r_ptr;
    char *str_tab;
   
    elf_symbol_t *sym_def;
    module_t *dest;
 
    printf("parse relocation table\n");
 
    sym_table = m->dyn.sym_tab;
    rt_entries = rt_size / sizeof(elf_rel_t);
    str_tab = m->dyn.str_tab;
 
    printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);
   
    for (i = 0; i < rt_entries; ++i) {
        printf("symbol %d: ", i);
        r_offset = rt[i].r_offset;
        r_info = rt[i].r_info;
 
        sym_idx = ELF32_R_SYM(r_info);
        sym = &sym_table[sym_idx];
 
        printf("name '%s', value 0x%x, size 0x%x\n",
            str_tab + sym->st_name,
            sym->st_value,
            sym->st_size);
 
        rel_type = ELF32_R_TYPE(r_info);
        r_ptr = (uint32_t *)(r_offset + m->bias);
 
        if (sym->st_name != 0) {
            printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);
            sym_def = symbol_def_find(str_tab + sym->st_name, &dest);
            printf("dest name: '%s'\n", dest->dyn.soname);
            printf("dest bias: 0x%x\n", dest->bias);
            if (sym_def) {
                sym_addr = sym_def->st_value + dest->bias;
                printf("symbol definition found, addr=0x%x\n", sym_addr);
            } else {
                printf("symbol definition not found\n");
                continue;
            }
        }
 
        switch (rel_type) {
        case R_386_GLOB_DAT:
        case R_386_JUMP_SLOT:
            printf("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");
            *r_ptr = sym_addr;
            break;
 
        case R_386_32:
            printf("fixup R_386_32 (b+v+a)\n");
            *r_ptr += sym_addr;
            break;
           
        case R_386_RELATIVE:
            printf("fixup R_386_RELATIVE (b+a)\n");
            *r_ptr += m->bias;
            break;
        }
    }
 
}
 
/** @}
 */
 

Rev 2980	Rev 2982
1	/*	1	/*
2	* Copyright (c) 2008 Jiri Svoboda	2	* Copyright (c) 2008 Jiri Svoboda
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup rtld rtld	29	/** @addtogroup rtld rtld
30	* @brief	30	* @brief
31	* @{	31	* @{
32	*/	32	*/
33	/**	33	/**
34	* @file	34	* @file
35	*/	35	*/
36		36
37	#include <stdio.h>	37	#include <stdio.h>
38		38
39	#include <arch.h>	39	#include <arch.h>
40	#include <elf_dyn.h>	40	#include <elf_dyn.h>
41	#include <symbol.h>	41	#include <symbol.h>
42	#include <rtld.h>	42	#include <rtld.h>
43		43
44	/**	44	/**
45	* Process (fixup) all relocations in a relocation table.	45	* Process (fixup) all relocations in a relocation table.
46	*/	46	*/
47	void rel_table_process(module_t m, elf_rel_t rt, size_t rt_size)	47	void rel_table_process(module_t m, elf_rel_t rt, size_t rt_size)
48	{	48	{
49	int i;	49	int i;
50		50
51	size_t rt_entries;	51	size_t rt_entries;
52	size_t r_offset;	52	size_t r_offset;
53	elf_word r_info;	53	elf_word r_info;
54	unsigned rel_type;	54	unsigned rel_type;
55	elf_word sym_idx;	55	elf_word sym_idx;
56	uintptr_t sym_addr;	56	uintptr_t sym_addr;
57		57
58	elf_symbol_t *sym_table;	58	elf_symbol_t *sym_table;
59	elf_symbol_t *sym;	59	elf_symbol_t *sym;
60	uint32_t *r_ptr;	60	uint32_t *r_ptr;
61	char *str_tab;	61	char *str_tab;
62		62
63	elf_symbol_t *sym_def;	63	elf_symbol_t *sym_def;
64	module_t *dest;	64	module_t *dest;
65		65
66	printf("parse relocation table\n");	66	printf("parse relocation table\n");
67		67
68	sym_table = m->dyn.sym_tab;	68	sym_table = m->dyn.sym_tab;
69	rt_entries = rt_size / sizeof(elf_rel_t);	69	rt_entries = rt_size / sizeof(elf_rel_t);
70	str_tab = m->dyn.str_tab;	70	str_tab = m->dyn.str_tab;
71		71
72	printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);	72	printf("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);
73		73
74	for (i = 0; i < rt_entries; ++i) {	74	for (i = 0; i < rt_entries; ++i) {
75	printf("symbol %d: ", i);	75	printf("symbol %d: ", i);
76	r_offset = rt[i].r_offset;	76	r_offset = rt[i].r_offset;
77	r_info = rt[i].r_info;	77	r_info = rt[i].r_info;
78		78
79	sym_idx = ELF32_R_SYM(r_info);	79	sym_idx = ELF32_R_SYM(r_info);
80	sym = &sym_table[sym_idx];	80	sym = &sym_table[sym_idx];
81		81
82	printf("name '%s', value 0x%x, size 0x%x\n",	82	printf("name '%s', value 0x%x, size 0x%x\n",
83	str_tab + sym->st_name,	83	str_tab + sym->st_name,
84	sym->st_value,	84	sym->st_value,
85	sym->st_size);	85	sym->st_size);
86		86
87	rel_type = ELF32_R_TYPE(r_info);	87	rel_type = ELF32_R_TYPE(r_info);
88	r_ptr = (uint32_t *)(r_offset + m->bias);	88	r_ptr = (uint32_t *)(r_offset + m->bias);
89		89
-		90	if (sym->st_name != 0) {
90	printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);	91	printf("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);
91	sym_def = symbol_def_find(str_tab + sym->st_name, &dest);	92	sym_def = symbol_def_find(str_tab + sym->st_name, &dest);
92	printf("dest name: '%s'\n", dest->dyn.soname);	93	printf("dest name: '%s'\n", dest->dyn.soname);
93	printf("dest bias: 0x%x\n", dest->bias);	94	printf("dest bias: 0x%x\n", dest->bias);
94	if (sym_def) {	95	if (sym_def) {
95	sym_addr = sym_def->st_value + dest->bias;	96	sym_addr = sym_def->st_value + dest->bias;
96	printf("symbol definition found, addr=0x%x\n", sym_addr);	97	printf("symbol definition found, addr=0x%x\n", sym_addr);
97	} else {	98	} else {
98	printf("symbol definition not found\n");	99	printf("symbol definition not found\n");
99	continue;	100	continue;
-		101	}
100	}	102	}
101		103
102	switch (rel_type) {	104	switch (rel_type) {
103	case R_386_GLOB_DAT:	105	case R_386_GLOB_DAT:
104	case R_386_JUMP_SLOT:	106	case R_386_JUMP_SLOT:
105	printf("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");	107	printf("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");
106	*r_ptr = sym_addr;	108	*r_ptr = sym_addr;
107	break;	109	break;
108		110
109	case R_386_32:	111	case R_386_32:
110	printf("fixup R_386_32 (b+v+a)\n");	112	printf("fixup R_386_32 (b+v+a)\n");
111	*r_ptr += sym_addr;	113	*r_ptr += sym_addr;
112	break;	114	break;
113		115
114	case R_386_RELATIVE:	116	case R_386_RELATIVE:
115	printf("fixup R_386_RELATIVE (b+a)\n");	117	printf("fixup R_386_RELATIVE (b+a)\n");
116	*r_ptr += m->bias;	118	*r_ptr += m->bias;
117	break;	119	break;
118	}	120	}
119	}	121	}
120		122
121	}	123	}
122		124
123	/** @}	125	/** @}
124	*/	126	*/
125		127

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(root)/branches/dynload/uspace/lib/rtld/arch/ia32/src/reloc.c – Rev 2980 → 2982