mirror of
https://github.com/autc04/Retro68.git
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661 lines
18 KiB
C
661 lines
18 KiB
C
/* test_plugin.c -- simple linker plugin test
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Copyright (C) 2008-2017 Free Software Foundation, Inc.
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Written by Cary Coutant <ccoutant@google.com>.
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This file is part of gold.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "plugin-api.h"
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struct claimed_file
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{
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const char* name;
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void* handle;
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int nsyms;
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struct ld_plugin_symbol* syms;
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struct claimed_file* next;
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};
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struct sym_info
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{
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int size;
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char* type;
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char* bind;
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char* vis;
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char* sect;
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char* name;
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};
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static struct claimed_file* first_claimed_file = NULL;
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static struct claimed_file* last_claimed_file = NULL;
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static ld_plugin_register_claim_file register_claim_file_hook = NULL;
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static ld_plugin_register_all_symbols_read register_all_symbols_read_hook = NULL;
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static ld_plugin_register_cleanup register_cleanup_hook = NULL;
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static ld_plugin_add_symbols add_symbols = NULL;
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static ld_plugin_get_symbols get_symbols = NULL;
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static ld_plugin_get_symbols get_symbols_v2 = NULL;
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static ld_plugin_get_symbols get_symbols_v3 = NULL;
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static ld_plugin_add_input_file add_input_file = NULL;
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static ld_plugin_message message = NULL;
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static ld_plugin_get_input_file get_input_file = NULL;
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static ld_plugin_release_input_file release_input_file = NULL;
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static ld_plugin_get_input_section_count get_input_section_count = NULL;
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static ld_plugin_get_input_section_type get_input_section_type = NULL;
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static ld_plugin_get_input_section_name get_input_section_name = NULL;
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static ld_plugin_get_input_section_contents get_input_section_contents = NULL;
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static ld_plugin_update_section_order update_section_order = NULL;
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static ld_plugin_allow_section_ordering allow_section_ordering = NULL;
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#define MAXOPTS 10
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static const char *opts[MAXOPTS];
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static int nopts = 0;
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enum ld_plugin_status onload(struct ld_plugin_tv *tv);
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enum ld_plugin_status claim_file_hook(const struct ld_plugin_input_file *file,
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int *claimed);
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enum ld_plugin_status all_symbols_read_hook(void);
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enum ld_plugin_status cleanup_hook(void);
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static void parse_readelf_line(char*, struct sym_info*);
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enum ld_plugin_status
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onload(struct ld_plugin_tv *tv)
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{
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struct ld_plugin_tv *entry;
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int api_version = 0;
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int gold_version = 0;
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int i;
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for (entry = tv; entry->tv_tag != LDPT_NULL; ++entry)
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{
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switch (entry->tv_tag)
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{
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case LDPT_API_VERSION:
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api_version = entry->tv_u.tv_val;
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break;
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case LDPT_GOLD_VERSION:
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gold_version = entry->tv_u.tv_val;
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break;
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case LDPT_LINKER_OUTPUT:
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break;
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case LDPT_OPTION:
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if (nopts < MAXOPTS)
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opts[nopts++] = entry->tv_u.tv_string;
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break;
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case LDPT_REGISTER_CLAIM_FILE_HOOK:
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register_claim_file_hook = entry->tv_u.tv_register_claim_file;
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break;
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case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK:
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register_all_symbols_read_hook =
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entry->tv_u.tv_register_all_symbols_read;
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break;
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case LDPT_REGISTER_CLEANUP_HOOK:
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register_cleanup_hook = entry->tv_u.tv_register_cleanup;
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break;
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case LDPT_ADD_SYMBOLS:
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add_symbols = entry->tv_u.tv_add_symbols;
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break;
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case LDPT_GET_SYMBOLS:
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get_symbols = entry->tv_u.tv_get_symbols;
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break;
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case LDPT_GET_SYMBOLS_V2:
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get_symbols_v2 = entry->tv_u.tv_get_symbols;
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break;
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case LDPT_GET_SYMBOLS_V3:
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get_symbols_v3 = entry->tv_u.tv_get_symbols;
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break;
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case LDPT_ADD_INPUT_FILE:
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add_input_file = entry->tv_u.tv_add_input_file;
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break;
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case LDPT_MESSAGE:
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message = entry->tv_u.tv_message;
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break;
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case LDPT_GET_INPUT_FILE:
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get_input_file = entry->tv_u.tv_get_input_file;
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break;
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case LDPT_RELEASE_INPUT_FILE:
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release_input_file = entry->tv_u.tv_release_input_file;
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break;
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case LDPT_GET_INPUT_SECTION_COUNT:
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get_input_section_count = *entry->tv_u.tv_get_input_section_count;
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break;
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case LDPT_GET_INPUT_SECTION_TYPE:
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get_input_section_type = *entry->tv_u.tv_get_input_section_type;
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break;
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case LDPT_GET_INPUT_SECTION_NAME:
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get_input_section_name = *entry->tv_u.tv_get_input_section_name;
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break;
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case LDPT_GET_INPUT_SECTION_CONTENTS:
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get_input_section_contents = *entry->tv_u.tv_get_input_section_contents;
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break;
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case LDPT_UPDATE_SECTION_ORDER:
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update_section_order = *entry->tv_u.tv_update_section_order;
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break;
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case LDPT_ALLOW_SECTION_ORDERING:
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allow_section_ordering = *entry->tv_u.tv_allow_section_ordering;
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break;
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default:
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break;
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}
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}
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if (message == NULL)
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{
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fprintf(stderr, "tv_message interface missing\n");
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return LDPS_ERR;
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}
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if (register_claim_file_hook == NULL)
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{
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fprintf(stderr, "tv_register_claim_file_hook interface missing\n");
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return LDPS_ERR;
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}
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if (register_all_symbols_read_hook == NULL)
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{
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fprintf(stderr, "tv_register_all_symbols_read_hook interface missing\n");
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return LDPS_ERR;
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}
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if (register_cleanup_hook == NULL)
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{
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fprintf(stderr, "tv_register_cleanup_hook interface missing\n");
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return LDPS_ERR;
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}
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(*message)(LDPL_INFO, "API version: %d", api_version);
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(*message)(LDPL_INFO, "gold version: %d", gold_version);
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for (i = 0; i < nopts; ++i)
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(*message)(LDPL_INFO, "option: %s", opts[i]);
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if ((*register_claim_file_hook)(claim_file_hook) != LDPS_OK)
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{
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(*message)(LDPL_ERROR, "error registering claim file hook");
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return LDPS_ERR;
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}
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if ((*register_all_symbols_read_hook)(all_symbols_read_hook) != LDPS_OK)
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{
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(*message)(LDPL_ERROR, "error registering all symbols read hook");
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return LDPS_ERR;
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}
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if ((*register_cleanup_hook)(cleanup_hook) != LDPS_OK)
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{
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(*message)(LDPL_ERROR, "error registering cleanup hook");
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return LDPS_ERR;
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}
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if (get_input_section_count == NULL)
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{
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fprintf(stderr, "tv_get_input_section_count interface missing\n");
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return LDPS_ERR;
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}
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if (get_input_section_type == NULL)
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{
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fprintf(stderr, "tv_get_input_section_type interface missing\n");
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return LDPS_ERR;
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}
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if (get_input_section_name == NULL)
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{
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fprintf(stderr, "tv_get_input_section_name interface missing\n");
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return LDPS_ERR;
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}
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if (get_input_section_contents == NULL)
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{
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fprintf(stderr, "tv_get_input_section_contents interface missing\n");
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return LDPS_ERR;
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}
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if (update_section_order == NULL)
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{
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fprintf(stderr, "tv_update_section_order interface missing\n");
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return LDPS_ERR;
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}
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if (allow_section_ordering == NULL)
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{
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fprintf(stderr, "tv_allow_section_ordering interface missing\n");
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return LDPS_ERR;
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}
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return LDPS_OK;
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}
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enum ld_plugin_status
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claim_file_hook (const struct ld_plugin_input_file* file, int* claimed)
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{
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int len;
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off_t end_offset;
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char buf[160];
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struct claimed_file* claimed_file;
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struct ld_plugin_symbol* syms;
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int nsyms = 0;
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int maxsyms = 0;
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FILE* irfile;
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struct sym_info info;
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int weak;
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int def;
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int vis;
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int is_comdat;
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int i;
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int irfile_was_opened = 0;
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char syms_name[80];
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(*message)(LDPL_INFO,
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"%s: claim file hook called (offset = %ld, size = %ld)",
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file->name, (long)file->offset, (long)file->filesize);
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/* Look for matching syms file for an archive member. */
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if (file->offset == 0)
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snprintf(syms_name, sizeof(syms_name), "%s.syms", file->name);
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else
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snprintf(syms_name, sizeof(syms_name), "%s-%d.syms",
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file->name, (int)file->offset);
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irfile = fopen(syms_name, "r");
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if (irfile != NULL)
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{
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irfile_was_opened = 1;
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end_offset = 1 << 20;
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}
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/* Otherwise, see if the file itself is a syms file. */
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if (!irfile_was_opened)
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{
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irfile = fdopen(file->fd, "r");
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(void)fseek(irfile, file->offset, SEEK_SET);
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end_offset = file->offset + file->filesize;
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}
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/* Look for the beginning of output from readelf -s. */
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len = fread(buf, 1, 13, irfile);
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if (len < 13 || strncmp(buf, "\nSymbol table", 13) != 0)
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return LDPS_OK;
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/* Skip the two header lines. */
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(void) fgets(buf, sizeof(buf), irfile);
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(void) fgets(buf, sizeof(buf), irfile);
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if (add_symbols == NULL)
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{
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fprintf(stderr, "tv_add_symbols interface missing\n");
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return LDPS_ERR;
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}
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/* Parse the output from readelf. The columns are:
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Index Value Size Type Binding Visibility Section Name. */
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syms = (struct ld_plugin_symbol*)malloc(sizeof(struct ld_plugin_symbol) * 8);
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if (syms == NULL)
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return LDPS_ERR;
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maxsyms = 8;
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while (ftell(irfile) < end_offset
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&& fgets(buf, sizeof(buf), irfile) != NULL)
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{
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parse_readelf_line(buf, &info);
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/* Ignore local symbols. */
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if (strncmp(info.bind, "LOCAL", 5) == 0)
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continue;
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weak = strncmp(info.bind, "WEAK", 4) == 0;
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if (strncmp(info.sect, "UND", 3) == 0)
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def = weak ? LDPK_WEAKUNDEF : LDPK_UNDEF;
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else if (strncmp(info.sect, "COM", 3) == 0)
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def = LDPK_COMMON;
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else
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def = weak ? LDPK_WEAKDEF : LDPK_DEF;
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if (strncmp(info.vis, "INTERNAL", 8) == 0)
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vis = LDPV_INTERNAL;
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else if (strncmp(info.vis, "HIDDEN", 6) == 0)
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vis = LDPV_HIDDEN;
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else if (strncmp(info.vis, "PROTECTED", 9) == 0)
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vis = LDPV_PROTECTED;
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else
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vis = LDPV_DEFAULT;
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/* If the symbol is listed in the options list, special-case
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it as a comdat symbol. */
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is_comdat = 0;
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for (i = 0; i < nopts; ++i)
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{
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if (info.name != NULL && strcmp(info.name, opts[i]) == 0)
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{
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is_comdat = 1;
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break;
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}
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}
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if (nsyms >= maxsyms)
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{
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syms = (struct ld_plugin_symbol*)
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realloc(syms, sizeof(struct ld_plugin_symbol) * maxsyms * 2);
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if (syms == NULL)
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return LDPS_ERR;
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maxsyms *= 2;
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}
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if (info.name == NULL)
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syms[nsyms].name = NULL;
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else
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{
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len = strlen(info.name);
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syms[nsyms].name = malloc(len + 1);
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strncpy(syms[nsyms].name, info.name, len + 1);
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}
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syms[nsyms].version = NULL;
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syms[nsyms].def = def;
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syms[nsyms].visibility = vis;
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syms[nsyms].size = info.size;
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syms[nsyms].comdat_key = is_comdat ? syms[nsyms].name : NULL;
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syms[nsyms].resolution = LDPR_UNKNOWN;
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++nsyms;
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}
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claimed_file = (struct claimed_file*) malloc(sizeof(struct claimed_file));
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if (claimed_file == NULL)
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return LDPS_ERR;
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claimed_file->name = file->name;
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claimed_file->handle = file->handle;
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claimed_file->nsyms = nsyms;
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claimed_file->syms = syms;
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claimed_file->next = NULL;
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if (last_claimed_file == NULL)
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first_claimed_file = claimed_file;
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else
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last_claimed_file->next = claimed_file;
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last_claimed_file = claimed_file;
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(*message)(LDPL_INFO, "%s: claiming file, adding %d symbols",
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file->name, nsyms);
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if (nsyms > 0)
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(*add_symbols)(file->handle, nsyms, syms);
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*claimed = 1;
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if (irfile_was_opened)
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fclose(irfile);
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return LDPS_OK;
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}
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enum ld_plugin_status
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all_symbols_read_hook(void)
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{
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int i;
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const char* res;
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struct claimed_file* claimed_file;
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struct ld_plugin_input_file file;
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FILE* irfile;
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off_t end_offset;
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struct sym_info info;
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int len;
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char buf[160];
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char* p;
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const char* filename;
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(*message)(LDPL_INFO, "all symbols read hook called");
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if (get_symbols_v3 == NULL)
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{
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fprintf(stderr, "tv_get_symbols (v3) interface missing\n");
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return LDPS_ERR;
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}
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for (claimed_file = first_claimed_file;
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claimed_file != NULL;
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claimed_file = claimed_file->next)
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{
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enum ld_plugin_status status = (*get_symbols_v3)(
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claimed_file->handle, claimed_file->nsyms, claimed_file->syms);
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if (status == LDPS_NO_SYMS)
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{
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(*message)(LDPL_INFO, "%s: no symbols", claimed_file->name);
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continue;
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}
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for (i = 0; i < claimed_file->nsyms; ++i)
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{
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switch (claimed_file->syms[i].resolution)
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{
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case LDPR_UNKNOWN:
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res = "UNKNOWN";
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break;
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case LDPR_UNDEF:
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res = "UNDEF";
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break;
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case LDPR_PREVAILING_DEF:
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res = "PREVAILING_DEF_REG";
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break;
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case LDPR_PREVAILING_DEF_IRONLY:
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res = "PREVAILING_DEF_IRONLY";
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break;
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case LDPR_PREVAILING_DEF_IRONLY_EXP:
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res = "PREVAILING_DEF_IRONLY_EXP";
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break;
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case LDPR_PREEMPTED_REG:
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res = "PREEMPTED_REG";
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break;
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case LDPR_PREEMPTED_IR:
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res = "PREEMPTED_IR";
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break;
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case LDPR_RESOLVED_IR:
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res = "RESOLVED_IR";
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break;
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case LDPR_RESOLVED_EXEC:
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res = "RESOLVED_EXEC";
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break;
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case LDPR_RESOLVED_DYN:
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res = "RESOLVED_DYN";
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break;
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default:
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res = "?";
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break;
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}
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(*message)(LDPL_INFO, "%s: %s: %s", claimed_file->name,
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claimed_file->syms[i].name, res);
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}
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}
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if (add_input_file == NULL)
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{
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fprintf(stderr, "tv_add_input_file interface missing\n");
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return LDPS_ERR;
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}
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if (get_input_file == NULL)
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{
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fprintf(stderr, "tv_get_input_file interface missing\n");
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return LDPS_ERR;
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}
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if (release_input_file == NULL)
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{
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fprintf(stderr, "tv_release_input_file interface missing\n");
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return LDPS_ERR;
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}
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for (claimed_file = first_claimed_file;
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claimed_file != NULL;
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claimed_file = claimed_file->next)
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{
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int irfile_was_opened = 0;
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char syms_name[80];
|
|
|
|
(*get_input_file) (claimed_file->handle, &file);
|
|
|
|
if (file.offset == 0)
|
|
snprintf(syms_name, sizeof(syms_name), "%s.syms", file.name);
|
|
else
|
|
snprintf(syms_name, sizeof(syms_name), "%s-%d.syms",
|
|
file.name, (int)file.offset);
|
|
irfile = fopen(syms_name, "r");
|
|
if (irfile != NULL)
|
|
{
|
|
irfile_was_opened = 1;
|
|
end_offset = 1 << 20;
|
|
}
|
|
|
|
if (!irfile_was_opened)
|
|
{
|
|
irfile = fdopen(file.fd, "r");
|
|
(void)fseek(irfile, file.offset, SEEK_SET);
|
|
end_offset = file.offset + file.filesize;
|
|
}
|
|
|
|
/* Look for the beginning of output from readelf -s. */
|
|
len = fread(buf, 1, 13, irfile);
|
|
if (len < 13 || strncmp(buf, "\nSymbol table", 13) != 0)
|
|
{
|
|
fprintf(stderr, "%s: can't re-read original input file\n",
|
|
claimed_file->name);
|
|
return LDPS_ERR;
|
|
}
|
|
|
|
/* Skip the two header lines. */
|
|
(void) fgets(buf, sizeof(buf), irfile);
|
|
(void) fgets(buf, sizeof(buf), irfile);
|
|
|
|
filename = NULL;
|
|
while (ftell(irfile) < end_offset
|
|
&& fgets(buf, sizeof(buf), irfile) != NULL)
|
|
{
|
|
parse_readelf_line(buf, &info);
|
|
|
|
/* Look for file name. */
|
|
if (strncmp(info.type, "FILE", 4) == 0)
|
|
{
|
|
len = strlen(info.name);
|
|
p = malloc(len + 1);
|
|
strncpy(p, info.name, len + 1);
|
|
filename = p;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (irfile_was_opened)
|
|
fclose(irfile);
|
|
|
|
(*release_input_file) (claimed_file->handle);
|
|
|
|
if (filename == NULL)
|
|
filename = claimed_file->name;
|
|
|
|
if (claimed_file->nsyms == 0)
|
|
continue;
|
|
|
|
if (strlen(filename) >= sizeof(buf))
|
|
{
|
|
(*message)(LDPL_FATAL, "%s: filename too long", filename);
|
|
return LDPS_ERR;
|
|
}
|
|
strcpy(buf, filename);
|
|
p = strrchr(buf, '.');
|
|
if (p == NULL
|
|
|| (strcmp(p, ".syms") != 0
|
|
&& strcmp(p, ".c") != 0
|
|
&& strcmp(p, ".cc") != 0))
|
|
{
|
|
(*message)(LDPL_FATAL, "%s: filename has unknown suffix",
|
|
filename);
|
|
return LDPS_ERR;
|
|
}
|
|
p[1] = 'o';
|
|
p[2] = '\0';
|
|
(*message)(LDPL_INFO, "%s: adding new input file", buf);
|
|
(*add_input_file)(buf);
|
|
}
|
|
|
|
return LDPS_OK;
|
|
}
|
|
|
|
enum ld_plugin_status
|
|
cleanup_hook(void)
|
|
{
|
|
(*message)(LDPL_INFO, "cleanup hook called");
|
|
return LDPS_OK;
|
|
}
|
|
|
|
static void
|
|
parse_readelf_line(char* p, struct sym_info* info)
|
|
{
|
|
int len;
|
|
|
|
p += strspn(p, " ");
|
|
|
|
/* Index field. */
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
/* Value field. */
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
/* Size field. */
|
|
info->size = atoi(p);
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
/* Type field. */
|
|
info->type = p;
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
/* Binding field. */
|
|
info->bind = p;
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
/* Visibility field. */
|
|
info->vis = p;
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
if (*p == '[')
|
|
{
|
|
/* Skip st_other. */
|
|
p += strcspn(p, "]");
|
|
p += strspn(p, "] ");
|
|
}
|
|
|
|
/* Section field. */
|
|
info->sect = p;
|
|
p += strcspn(p, " ");
|
|
p += strspn(p, " ");
|
|
|
|
/* Name field. */
|
|
/* FIXME: Look for version. */
|
|
len = strlen(p);
|
|
if (len == 0)
|
|
p = NULL;
|
|
else if (p[len-1] == '\n')
|
|
p[--len] = '\0';
|
|
info->name = p;
|
|
}
|