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2999 svoboda 1
/*
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup rtld rtld
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 * @brief
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 * @{
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 */
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/**
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 * @file
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
4691 svoboda 41
#include <adt/list.h>
3400 svoboda 42
#include <loader/pcb.h>
2999 svoboda 43
 
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#include <rtld.h>
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#include <dynamic.h>
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#include <elf_load.h>
3400 svoboda 47
#include <rtld_arch.h>
2999 svoboda 48
#include <module.h>
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/** (Eagerly) process all relocation tables in a module.
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 *
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 * Currently works as if LD_BIND_NOW was specified.
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 */
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void module_process_relocs(module_t *m)
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{
3562 svoboda 56
    DPRINTF("module_process_relocs('%s')\n", m->dyn.soname);
3689 svoboda 57
 
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    /* Do not relocate twice. */
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    if (m->relocated) return;
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3869 svoboda 61
    module_process_pre_arch(m);
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2999 svoboda 63
    if (m->dyn.plt_rel == DT_REL) {
3869 svoboda 64
        DPRINTF("table type DT_REL\n");
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        if (m->dyn.rel != NULL) {
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            DPRINTF("non-empty\n");
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            rel_table_process(m, m->dyn.rel, m->dyn.rel_sz);
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        }
2999 svoboda 69
        /* FIXME: this seems wrong */
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        if (m->dyn.jmp_rel != NULL) {
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        DPRINTF("table type jmp-rel\n");
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            DPRINTF("non-empty\n");
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            rel_table_process(m, m->dyn.jmp_rel, m->dyn.plt_rel_sz);
3869 svoboda 74
        }
2999 svoboda 75
    } else { /* (m->dyn.plt_rel == DT_RELA) */
3562 svoboda 76
        DPRINTF("table type DT_RELA\n");
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        if (m->dyn.rela != NULL) {
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            DPRINTF("non-empty\n");
2999 svoboda 79
            rela_table_process(m, m->dyn.rela, m->dyn.rela_sz);
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        }
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    }
3689 svoboda 82
 
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    m->relocated = true;
2999 svoboda 84
}
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3000 svoboda 86
/** Find module structure by soname/pathname.
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 *
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 * Used primarily to see if a module has already been loaded.
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 * Modules are compared according to their soname, i.e. possible
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 * path components are ignored.
2999 svoboda 91
 */
3000 svoboda 92
module_t *module_find(char *name)
2999 svoboda 93
{
3686 svoboda 94
    link_t *head = &runtime_env->modules_head;
2999 svoboda 95
 
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    link_t *cur;
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    module_t *m;
3000 svoboda 98
    char *p, *soname;
2999 svoboda 99
 
3000 svoboda 100
    /*
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     * If name contains slashes, treat it as a pathname and
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     * construct soname by chopping off the path. Otherwise
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     * treat it as soname.
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     */
4348 svoboda 105
    p = str_rchr(name, '/');
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    soname = p ? (p + 1) : name;
3686 svoboda 107
 
3000 svoboda 108
    /* Traverse list of all modules. Not extremely fast, but simple */
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    for (cur = head->next; cur != head; cur = cur->next) {
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        m = list_get_instance(cur, module_t, modules_link);
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        if (str_cmp(m->dyn.soname, soname) == 0) {
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            return m; /* Found */
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        }
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    }
115
 
116
    return NULL; /* Not found */
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}
118
 
119
#define NAME_BUF_SIZE 64
120
 
121
/** Load a module.
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 *
3000 svoboda 123
 * Currently this trivially tries to load '/<name>'.
2999 svoboda 124
 */
3000 svoboda 125
module_t *module_load(char *name)
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{
127
    elf_info_t info;
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    char name_buf[NAME_BUF_SIZE];
129
    module_t *m;
130
    int rc;
131
 
132
    m = malloc(sizeof(module_t));
133
    if (!m) {
134
        printf("malloc failed\n");
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        exit(1);
136
    }
137
 
4348 svoboda 138
    if (str_size(name) > NAME_BUF_SIZE - 2) {
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        printf("soname too long. increase NAME_BUF_SIZE\n");
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        exit(1);
141
    }
142
 
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    /* Prepend soname with '/lib/' */
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    str_cpy(name_buf, NAME_BUF_SIZE, "/lib/");
145
    str_cpy(name_buf + 5, NAME_BUF_SIZE - 5, name);
2999 svoboda 146
 
3689 svoboda 147
    /* FIXME: need to real allocation of address space */
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    m->bias = runtime_env->next_bias;
149
    runtime_env->next_bias += 0x100000;
150
 
3562 svoboda 151
    DPRINTF("filename:'%s'\n", name_buf);
3869 svoboda 152
    printf("load '%s' at 0x%x\n", name_buf, m->bias);
2999 svoboda 153
 
3552 svoboda 154
    rc = elf_load_file(name_buf, m->bias, ELDF_RW, &info);
3689 svoboda 155
    if (rc != EE_OK) {
3400 svoboda 156
        printf("Failed to load '%s'\n", name_buf);
2999 svoboda 157
        exit(1);
158
    }
159
 
3690 svoboda 160
    if (info.dynamic == NULL) {
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        printf("Error: '%s' is not a dynamically-linked object.\n",
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            name_buf);
163
        exit(1);
164
    }
165
 
3689 svoboda 166
    /* Pending relocation. */
167
    m->relocated = false;
168
 
3562 svoboda 169
    DPRINTF("parse dynamic section\n");
2999 svoboda 170
    /* Parse ELF .dynamic section. Store info to m->dyn. */
171
    dynamic_parse(info.dynamic, m->bias, &m->dyn);
172
 
173
    /* Insert into the list of loaded modules */
3686 svoboda 174
    list_append(&m->modules_link, &runtime_env->modules_head);
2999 svoboda 175
 
176
    return m;
177
}
178
 
179
/** Load all modules on which m (transitively) depends.
180
 */
181
void module_load_deps(module_t *m)
182
{
183
    elf_dyn_t *dp;
3000 svoboda 184
    char *dep_name;
2999 svoboda 185
    module_t *dm;
186
    size_t n, i;
187
 
188
    /* Count direct dependencies */
189
 
190
    dp = m->dyn.dynamic;
191
    n = 0;
192
 
193
    while (dp->d_tag != DT_NULL) {
194
        if (dp->d_tag == DT_NEEDED) ++n;
195
        ++dp;
196
    }
197
 
198
    /* Create an array of pointers to direct dependencies */
199
 
200
    m->n_deps = n;
3553 svoboda 201
 
202
    if (n == 0) {
203
        /* There are no dependencies, so we are done. */
2999 svoboda 204
        m->deps = NULL;
3553 svoboda 205
        return;
206
    }
2999 svoboda 207
 
3553 svoboda 208
    m->deps = malloc(n * sizeof(module_t *));
2999 svoboda 209
    if (!m->deps) {
210
        printf("malloc failed\n");
211
        exit(1);
212
    }
213
 
214
    i = 0; /* Current dependency index */
215
    dp = m->dyn.dynamic;
216
 
217
    while (dp->d_tag != DT_NULL) {
218
        if (dp->d_tag == DT_NEEDED) {
3000 svoboda 219
            dep_name = m->dyn.str_tab + dp->d_un.d_val;
2999 svoboda 220
 
3562 svoboda 221
            DPRINTF("%s needs %s\n", m->dyn.soname, dep_name);
3000 svoboda 222
            dm = module_find(dep_name);
2999 svoboda 223
            if (!dm) {
3000 svoboda 224
                dm = module_load(dep_name);
2999 svoboda 225
                module_load_deps(dm);
226
            }
227
 
228
            /* Save into deps table */
229
            m->deps[i++] = dm;
230
        }
231
        ++dp;
232
    }
233
}
234
 
3689 svoboda 235
/** Process relocations in modules.
236
 *
237
 * Processes relocations in @a start and all its dependencies.
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 * Modules that have already been relocated are unaffected.
239
 *
240
 * @param   start   The module where to start from.
241
 */
242
void modules_process_relocs(module_t *start)
2999 svoboda 243
{
3686 svoboda 244
    link_t *head = &runtime_env->modules_head;
2999 svoboda 245
 
246
    link_t *cur;
247
    module_t *m;
248
 
249
    for (cur = head->next; cur != head; cur = cur->next) {
250
        m = list_get_instance(cur, module_t, modules_link);
251
 
252
        /* Skip rtld, since it has already been processed */
3686 svoboda 253
        if (m != &runtime_env->rtld) {
2999 svoboda 254
            module_process_relocs(m);
255
        }
256
    }
257
}
258
 
3000 svoboda 259
/** Clear BFS tags of all modules.
260
 */
261
void modules_untag(void)
262
{
3686 svoboda 263
    link_t *head = &runtime_env->modules_head;
3000 svoboda 264
 
265
    link_t *cur;
266
    module_t *m;
267
 
268
    for (cur = head->next; cur != head; cur = cur->next) {
269
        m = list_get_instance(cur, module_t, modules_link);
270
        m->bfs_tag = false;
271
    }
272
}
273
 
2999 svoboda 274
/** @}
275
 */