WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/libc/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 <stdlib.h>
 
#include <elf_dyn.h>
#include <symbol.h>
#include <rtld.h>
 
#include <rtld_arch.h>
 
void module_process_pre_arch(module_t *m)
{
    /* Unused */
}
 
 
/**
 * 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;
    uint32_t sym_size;
    char *str_tab;
   
    elf_symbol_t *sym_def;
    module_t *dest;
 
    DPRINTF("parse relocation table\n");
 
    sym_table = m->dyn.sym_tab;
    rt_entries = rt_size / sizeof(elf_rel_t);
    str_tab = m->dyn.str_tab;
 
    DPRINTF("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);
   
    for (i = 0; i < rt_entries; ++i) {
//      DPRINTF("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];
 
/*      DPRINTF("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) {
//          DPRINTF("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);
            sym_def = symbol_def_find(str_tab + sym->st_name,
                m, &dest);
//          DPRINTF("dest name: '%s'\n", dest->dyn.soname);
//          DPRINTF("dest bias: 0x%x\n", dest->bias);
            if (sym_def) {
                sym_addr = symbol_get_addr(sym_def, dest);
//              DPRINTF("symbol definition found, addr=0x%x\n", sym_addr);
            } else {
                printf("Definition of '%s' not found.\n",
                    str_tab + sym->st_name);
                continue;
            }
        }
 
        switch (rel_type) {
        case R_386_GLOB_DAT:
        case R_386_JUMP_SLOT:
            DPRINTF("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");
            *r_ptr = sym_addr;
            break;
 
        case R_386_32:
            DPRINTF("fixup R_386_32 (b+v+a)\n");
            *r_ptr += sym_addr;
            break;
 
        case R_386_PC32:
            DPRINTF("fixup R_386_PC32 (b+v+a-p)\n");
            *r_ptr += sym_addr - (uint32_t) r_ptr;
            break;
 
        case R_386_COPY:
            /*
             * Copy symbol data from shared object to specified
             * location.
             */
            DPRINTF("fixup R_386_COPY (s)\n");
            sym_size = sym->st_size;
            if (sym_size != sym_def->st_size) {
                printf("Warning: Mismatched symbol sizes.\n");
                /* Take the lower value. */
                if (sym_size > sym_def->st_size)
                    sym_size = sym_def->st_size;
            }
            memcpy(r_ptr, (const void *)sym_addr, sym_size);
            break;
           
        case R_386_RELATIVE:
            DPRINTF("fixup R_386_RELATIVE (b+a)\n");
            *r_ptr += m->bias;
            break;
 
        case R_386_TLS_DTPMOD32:
            /*
             * We can ignore this as long as the only module
             * with TLS variables is libc.so.
             */
            DPRINTF("Ignoring R_386_TLS_DTPMOD32\n");
            break;
 
        default:
            printf("Error: Unknown relocation type %d\n",
                rel_type);
            exit(1);
        }
 
    }
 
}
 
void rela_table_process(module_t *m, elf_rela_t *rt, size_t rt_size)
{
    /* Unused */
    (void)m; (void)rt; (void)rt_size;
}
 
/** @}
 */
 

Rev 4354	Rev 4372
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	#include <stdlib.h>	38	#include <stdlib.h>
39		39
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	#include <rtld_arch.h>	44	#include <rtld_arch.h>
45		45
46	void module_process_pre_arch(module_t *m)	46	void module_process_pre_arch(module_t *m)
47	{	47	{
48	/* Unused */	48	/* Unused */
49	}	49	}
50		50
51		51
52	/**	52	/**
53	* Process (fixup) all relocations in a relocation table.	53	* Process (fixup) all relocations in a relocation table.
54	*/	54	*/
55	void rel_table_process(module_t m, elf_rel_t rt, size_t rt_size)	55	void rel_table_process(module_t m, elf_rel_t rt, size_t rt_size)
56	{	56	{
57	int i;	57	int i;
58		58
59	size_t rt_entries;	59	size_t rt_entries;
60	size_t r_offset;	60	size_t r_offset;
61	elf_word r_info;	61	elf_word r_info;
62	unsigned rel_type;	62	unsigned rel_type;
63	elf_word sym_idx;	63	elf_word sym_idx;
64	uintptr_t sym_addr;	64	uintptr_t sym_addr;
65		65
66	elf_symbol_t *sym_table;	66	elf_symbol_t *sym_table;
67	elf_symbol_t *sym;	67	elf_symbol_t *sym;
68	uint32_t *r_ptr;	68	uint32_t *r_ptr;
69	uint32_t sym_size;	69	uint32_t sym_size;
70	char *str_tab;	70	char *str_tab;
71		71
72	elf_symbol_t *sym_def;	72	elf_symbol_t *sym_def;
73	module_t *dest;	73	module_t *dest;
74		74
75	DPRINTF("parse relocation table\n");	75	DPRINTF("parse relocation table\n");
76		76
77	sym_table = m->dyn.sym_tab;	77	sym_table = m->dyn.sym_tab;
78	rt_entries = rt_size / sizeof(elf_rel_t);	78	rt_entries = rt_size / sizeof(elf_rel_t);
79	str_tab = m->dyn.str_tab;	79	str_tab = m->dyn.str_tab;
80		80
81	DPRINTF("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);	81	DPRINTF("address: 0x%x, entries: %d\n", (uintptr_t)rt, rt_entries);
82		82
83	for (i = 0; i < rt_entries; ++i) {	83	for (i = 0; i < rt_entries; ++i) {
84	// DPRINTF("symbol %d: ", i);	84	// DPRINTF("symbol %d: ", i);
85	r_offset = rt[i].r_offset;	85	r_offset = rt[i].r_offset;
86	r_info = rt[i].r_info;	86	r_info = rt[i].r_info;
87		87
88	sym_idx = ELF32_R_SYM(r_info);	88	sym_idx = ELF32_R_SYM(r_info);
89	sym = &sym_table[sym_idx];	89	sym = &sym_table[sym_idx];
90		90
91	/* DPRINTF("name '%s', value 0x%x, size 0x%x\n",	91	/* DPRINTF("name '%s', value 0x%x, size 0x%x\n",
92	str_tab + sym->st_name,	92	str_tab + sym->st_name,
93	sym->st_value,	93	sym->st_value,
94	sym->st_size);	94	sym->st_size);
95	*/	95	*/
96	rel_type = ELF32_R_TYPE(r_info);	96	rel_type = ELF32_R_TYPE(r_info);
97	r_ptr = (uint32_t *)(r_offset + m->bias);	97	r_ptr = (uint32_t *)(r_offset + m->bias);
98		98
99	if (sym->st_name != 0) {	99	if (sym->st_name != 0) {
100	// DPRINTF("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);	100	// DPRINTF("rel_type: %x, rel_offset: 0x%x\n", rel_type, r_offset);
101	sym_def = symbol_def_find(str_tab + sym->st_name,	101	sym_def = symbol_def_find(str_tab + sym->st_name,
102	m, &dest);	102	m, &dest);
103	// DPRINTF("dest name: '%s'\n", dest->dyn.soname);	103	// DPRINTF("dest name: '%s'\n", dest->dyn.soname);
104	// DPRINTF("dest bias: 0x%x\n", dest->bias);	104	// DPRINTF("dest bias: 0x%x\n", dest->bias);
105	if (sym_def) {	105	if (sym_def) {
106	sym_addr = symbol_get_addr(sym_def, dest);	106	sym_addr = symbol_get_addr(sym_def, dest);
107	// DPRINTF("symbol definition found, addr=0x%x\n", sym_addr);	107	// DPRINTF("symbol definition found, addr=0x%x\n", sym_addr);
108	} else {	108	} else {
109	DPRINTF("symbol definition not found\n");	109	printf("Definition of '%s' not found.\n",
-		110	str_tab + sym->st_name);
110	continue;	111	continue;
111	}	112	}
112	}	113	}
113		114
114	switch (rel_type) {	115	switch (rel_type) {
115	case R_386_GLOB_DAT:	116	case R_386_GLOB_DAT:
116	case R_386_JUMP_SLOT:	117	case R_386_JUMP_SLOT:
117	DPRINTF("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");	118	DPRINTF("fixup R_386_GLOB_DAT/JUMP_SLOT (b+v)\n");
118	*r_ptr = sym_addr;	119	*r_ptr = sym_addr;
119	break;	120	break;
120		121
121	case R_386_32:	122	case R_386_32:
122	DPRINTF("fixup R_386_32 (b+v+a)\n");	123	DPRINTF("fixup R_386_32 (b+v+a)\n");
123	*r_ptr += sym_addr;	124	*r_ptr += sym_addr;
124	break;	125	break;
125		126
126	case R_386_PC32:	127	case R_386_PC32:
127	DPRINTF("fixup R_386_PC32 (b+v+a-p)\n");	128	DPRINTF("fixup R_386_PC32 (b+v+a-p)\n");
128	*r_ptr += sym_addr - (uint32_t) r_ptr;	129	*r_ptr += sym_addr - (uint32_t) r_ptr;
129	break;	130	break;
130		131
131	case R_386_COPY:	132	case R_386_COPY:
132	/*	133	/*
133	* Copy symbol data from shared object to specified	134	* Copy symbol data from shared object to specified
134	* location.	135	* location.
135	*/	136	*/
136	DPRINTF("fixup R_386_COPY (s)\n");	137	DPRINTF("fixup R_386_COPY (s)\n");
137	sym_size = sym->st_size;	138	sym_size = sym->st_size;
138	if (sym_size != sym_def->st_size) {	139	if (sym_size != sym_def->st_size) {
139	printf("Warning: Mismatched symbol sizes.\n");	140	printf("Warning: Mismatched symbol sizes.\n");
140	/* Take the lower value. */	141	/* Take the lower value. */
141	if (sym_size > sym_def->st_size)	142	if (sym_size > sym_def->st_size)
142	sym_size = sym_def->st_size;	143	sym_size = sym_def->st_size;
143	}	144	}
144	memcpy(r_ptr, (const void *)sym_addr, sym_size);	145	memcpy(r_ptr, (const void *)sym_addr, sym_size);
145	break;	146	break;
146		147
147	case R_386_RELATIVE:	148	case R_386_RELATIVE:
148	DPRINTF("fixup R_386_RELATIVE (b+a)\n");	149	DPRINTF("fixup R_386_RELATIVE (b+a)\n");
149	*r_ptr += m->bias;	150	*r_ptr += m->bias;
150	break;	151	break;
151		152
152	case R_386_TLS_DTPMOD32:	153	case R_386_TLS_DTPMOD32:
153	/*	154	/*
154	* We can ignore this as long as the only module	155	* We can ignore this as long as the only module
155	* with TLS variables is libc.so.	156	* with TLS variables is libc.so.
156	*/	157	*/
157	DPRINTF("Ignoring R_386_TLS_DTPMOD32\n");	158	DPRINTF("Ignoring R_386_TLS_DTPMOD32\n");
158	break;	159	break;
159		160
160	default:	161	default:
161	printf("Error: Unknown relocation type %d\n",	162	printf("Error: Unknown relocation type %d\n",
162	rel_type);	163	rel_type);
163	exit(1);	164	exit(1);
164	}	165	}
165		166
166	}	167	}
167		168
168	}	169	}
169		170
170	void rela_table_process(module_t m, elf_rela_t rt, size_t rt_size)	171	void rela_table_process(module_t m, elf_rela_t rt, size_t rt_size)
171	{	172	{
172	/* Unused */	173	/* Unused */
173	(void)m; (void)rt; (void)rt_size;	174	(void)m; (void)rt; (void)rt_size;
174	}	175	}
175		176
176	/** @}	177	/** @}
177	*/	178	*/
178		179

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(root)/branches/dynload/uspace/lib/libc/rtld/arch/ia32/src/reloc.c – Rev 4354 → 4372