^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * elf.c - ELF access library
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Adapted from kpatch (https://github.com/dynup/kpatch):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2013-2015 Josh Poimboeuf <jpoimboe@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "builtin.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "elf.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "warn.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define MAX_NAME_LEN 128
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline u32 str_hash(const char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) return jhash(str, strlen(str), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static inline int elf_hash_bits(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return vmlinux ? ELF_HASH_BITS : 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define elf_hash_add(hashtable, node, key) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) hlist_add_head(node, &hashtable[hash_min(key, elf_hash_bits())])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static void elf_hash_init(struct hlist_head *table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) __hash_init(table, 1U << elf_hash_bits());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define elf_hash_for_each_possible(name, obj, member, key) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) hlist_for_each_entry(obj, &name[hash_min(key, elf_hash_bits())], member)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static void rb_add(struct rb_root *tree, struct rb_node *node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int (*cmp)(struct rb_node *, const struct rb_node *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct rb_node **link = &tree->rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct rb_node *parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) while (*link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) parent = *link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (cmp(node, parent) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) link = &parent->rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) link = &parent->rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) rb_link_node(node, parent, link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) rb_insert_color(node, tree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static struct rb_node *rb_find_first(const struct rb_root *tree, const void *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int (*cmp)(const void *key, const struct rb_node *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct rb_node *node = tree->rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct rb_node *match = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) while (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int c = cmp(key, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (c <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) match = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) node = node->rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) } else if (c > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) node = node->rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static struct rb_node *rb_next_match(struct rb_node *node, const void *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int (*cmp)(const void *key, const struct rb_node *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) node = rb_next(node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (node && cmp(key, node))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) node = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define rb_for_each(tree, node, key, cmp) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) for ((node) = rb_find_first((tree), (key), (cmp)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) (node); (node) = rb_next_match((node), (key), (cmp)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static int symbol_to_offset(struct rb_node *a, const struct rb_node *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct symbol *sa = rb_entry(a, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct symbol *sb = rb_entry(b, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (sa->offset < sb->offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (sa->offset > sb->offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (sa->len < sb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (sa->len > sb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) sa->alias = sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int symbol_by_offset(const void *key, const struct rb_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) const struct symbol *s = rb_entry(node, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) const unsigned long *o = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (*o < s->offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (*o >= s->offset + s->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct section *find_section_by_name(const struct elf *elf, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) elf_hash_for_each_possible(elf->section_name_hash, sec, name_hash, str_hash(name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (!strcmp(sec->name, name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static struct section *find_section_by_index(struct elf *elf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) unsigned int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) elf_hash_for_each_possible(elf->section_hash, sec, hash, idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (sec->idx == idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct symbol *sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) elf_hash_for_each_possible(elf->symbol_hash, sym, hash, idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (sym->idx == idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) rb_for_each(&sec->symbol_tree, node, &offset, symbol_by_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct symbol *s = rb_entry(node, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (s->offset == offset && s->type != STT_SECTION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) struct symbol *find_func_by_offset(struct section *sec, unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) rb_for_each(&sec->symbol_tree, node, &offset, symbol_by_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct symbol *s = rb_entry(node, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (s->offset == offset && s->type == STT_FUNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) rb_for_each(&sec->symbol_tree, node, &offset, symbol_by_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct symbol *s = rb_entry(node, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (s->type != STT_SECTION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct symbol *find_func_containing(struct section *sec, unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct rb_node *node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) rb_for_each(&sec->symbol_tree, node, &offset, symbol_by_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct symbol *s = rb_entry(node, struct symbol, node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (s->type == STT_FUNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct symbol *find_symbol_by_name(const struct elf *elf, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct symbol *sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) elf_hash_for_each_possible(elf->symbol_name_hash, sym, name_hash, str_hash(name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (!strcmp(sym->name, name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *sec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) unsigned long offset, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct reloc *reloc, *r = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) unsigned long o;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (!sec->reloc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) sec = sec->reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) for_offset_range(o, offset, offset + len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) elf_hash_for_each_possible(elf->reloc_hash, reloc, hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) sec_offset_hash(sec, o)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (reloc->sec != sec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (reloc->offset >= offset && reloc->offset < offset + len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (!r || reloc->offset < r->offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) r = reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return find_reloc_by_dest_range(elf, sec, offset, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) void insn_to_reloc_sym_addend(struct section *sec, unsigned long offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct reloc *reloc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (sec->sym) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) reloc->sym = sec->sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) reloc->addend = offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * The Clang assembler strips section symbols, so we have to reference
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * the function symbol instead:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) reloc->sym = find_symbol_containing(sec, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (!reloc->sym) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * Hack alert. This happens when we need to reference the NOP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * pad insn immediately after the function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) reloc->sym = find_symbol_containing(sec, offset - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (reloc->sym)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) reloc->addend = offset - reloc->sym->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int read_sections(struct elf *elf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) Elf_Scn *s = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) size_t shstrndx, sections_nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (elf_getshdrnum(elf->elf, §ions_nr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) WARN_ELF("elf_getshdrnum");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (elf_getshdrstrndx(elf->elf, &shstrndx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) WARN_ELF("elf_getshdrstrndx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) for (i = 0; i < sections_nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) sec = malloc(sizeof(*sec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (!sec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) memset(sec, 0, sizeof(*sec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) INIT_LIST_HEAD(&sec->symbol_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) INIT_LIST_HEAD(&sec->reloc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) s = elf_getscn(elf->elf, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (!s) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) WARN_ELF("elf_getscn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) sec->idx = elf_ndxscn(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (!gelf_getshdr(s, &sec->sh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) WARN_ELF("gelf_getshdr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) sec->name = elf_strptr(elf->elf, shstrndx, sec->sh.sh_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (!sec->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) WARN_ELF("elf_strptr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (sec->sh.sh_size != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) sec->data = elf_getdata(s, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (!sec->data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) WARN_ELF("elf_getdata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (sec->data->d_off != 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) sec->data->d_size != sec->sh.sh_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) WARN("unexpected data attributes for %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) sec->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) sec->len = sec->sh.sh_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) list_add_tail(&sec->list, &elf->sections);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) elf_hash_add(elf->section_hash, &sec->hash, sec->idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) elf_hash_add(elf->section_name_hash, &sec->name_hash, str_hash(sec->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (stats)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) printf("nr_sections: %lu\n", (unsigned long)sections_nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /* sanity check, one more call to elf_nextscn() should return NULL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (elf_nextscn(elf->elf, s)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) WARN("section entry mismatch");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static int read_symbols(struct elf *elf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct section *symtab, *symtab_shndx, *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) struct symbol *sym, *pfunc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) struct list_head *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct rb_node *pnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) int symbols_nr, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) char *coldstr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) Elf_Data *shndx_data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) Elf32_Word shndx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) symtab = find_section_by_name(elf, ".symtab");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (!symtab) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * A missing symbol table is actually possible if it's an empty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * .o file. This can happen for thunk_64.o.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (symtab_shndx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) shndx_data = symtab_shndx->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) for (i = 0; i < symbols_nr; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) sym = malloc(sizeof(*sym));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (!sym) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) memset(sym, 0, sizeof(*sym));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) sym->alias = sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) sym->idx = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (!gelf_getsymshndx(symtab->data, shndx_data, i, &sym->sym,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) &shndx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) WARN_ELF("gelf_getsymshndx");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) sym->name = elf_strptr(elf->elf, symtab->sh.sh_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) sym->sym.st_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (!sym->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) WARN_ELF("elf_strptr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) sym->type = GELF_ST_TYPE(sym->sym.st_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) sym->bind = GELF_ST_BIND(sym->sym.st_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if ((sym->sym.st_shndx > SHN_UNDEF &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) sym->sym.st_shndx < SHN_LORESERVE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) (shndx_data && sym->sym.st_shndx == SHN_XINDEX)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (sym->sym.st_shndx != SHN_XINDEX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) shndx = sym->sym.st_shndx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) sym->sec = find_section_by_index(elf, shndx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (!sym->sec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) WARN("couldn't find section for symbol %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) sym->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if (sym->type == STT_SECTION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) sym->name = sym->sec->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) sym->sec->sym = sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) sym->sec = find_section_by_index(elf, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) sym->offset = sym->sym.st_value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) sym->len = sym->sym.st_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) rb_add(&sym->sec->symbol_tree, &sym->node, symbol_to_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) pnode = rb_prev(&sym->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (pnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) entry = &rb_entry(pnode, struct symbol, node)->list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) entry = &sym->sec->symbol_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) list_add(&sym->list, entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) elf_hash_add(elf->symbol_hash, &sym->hash, sym->idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) elf_hash_add(elf->symbol_name_hash, &sym->name_hash, str_hash(sym->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * Don't store empty STT_NOTYPE symbols in the rbtree. They
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * can exist within a function, confusing the sorting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (!sym->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) rb_erase(&sym->node, &sym->sec->symbol_tree);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (stats)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) printf("nr_symbols: %lu\n", (unsigned long)symbols_nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /* Create parent/child links for any cold subfunctions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) list_for_each_entry(sec, &elf->sections, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) list_for_each_entry(sym, &sec->symbol_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) char pname[MAX_NAME_LEN + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) size_t pnamelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (sym->type != STT_FUNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (sym->pfunc == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) sym->pfunc = sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (sym->cfunc == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) sym->cfunc = sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) coldstr = strstr(sym->name, ".cold");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (!coldstr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) pnamelen = coldstr - sym->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (pnamelen > MAX_NAME_LEN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) WARN("%s(): parent function name exceeds maximum length of %d characters",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sym->name, MAX_NAME_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) strncpy(pname, sym->name, pnamelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) pname[pnamelen] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) pfunc = find_symbol_by_name(elf, pname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (!pfunc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) WARN("%s(): can't find parent function",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) sym->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) sym->pfunc = pfunc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) pfunc->cfunc = sym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * Unfortunately, -fnoreorder-functions puts the child
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) * inside the parent. Remove the overlap so we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * have sane assumptions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * Note that pfunc->len now no longer matches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) * pfunc->sym.st_size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (sym->sec == pfunc->sec &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) sym->offset >= pfunc->offset &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) sym->offset + sym->len == pfunc->offset + pfunc->len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) pfunc->len -= sym->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) free(sym);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) void elf_add_reloc(struct elf *elf, struct reloc *reloc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) struct section *sec = reloc->sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) list_add_tail(&reloc->list, &sec->reloc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) elf_hash_add(elf->reloc_hash, &reloc->hash, reloc_hash(reloc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static int read_rel_reloc(struct section *sec, int i, struct reloc *reloc, unsigned int *symndx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (!gelf_getrel(sec->data, i, &reloc->rel)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) WARN_ELF("gelf_getrel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) reloc->type = GELF_R_TYPE(reloc->rel.r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) reloc->addend = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) reloc->offset = reloc->rel.r_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) *symndx = GELF_R_SYM(reloc->rel.r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) static int read_rela_reloc(struct section *sec, int i, struct reloc *reloc, unsigned int *symndx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (!gelf_getrela(sec->data, i, &reloc->rela)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) WARN_ELF("gelf_getrela");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) reloc->type = GELF_R_TYPE(reloc->rela.r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) reloc->addend = reloc->rela.r_addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) reloc->offset = reloc->rela.r_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) *symndx = GELF_R_SYM(reloc->rela.r_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) static int read_relocs(struct elf *elf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) struct reloc *reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) unsigned int symndx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) unsigned long nr_reloc, max_reloc = 0, tot_reloc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) list_for_each_entry(sec, &elf->sections, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if ((sec->sh.sh_type != SHT_RELA) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) (sec->sh.sh_type != SHT_REL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) sec->base = find_section_by_index(elf, sec->sh.sh_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) if (!sec->base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) WARN("can't find base section for reloc section %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) sec->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) sec->base->reloc = sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) nr_reloc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) for (i = 0; i < sec->sh.sh_size / sec->sh.sh_entsize; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) reloc = malloc(sizeof(*reloc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if (!reloc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) memset(reloc, 0, sizeof(*reloc));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) switch (sec->sh.sh_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) case SHT_REL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) if (read_rel_reloc(sec, i, reloc, &symndx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) case SHT_RELA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (read_rela_reloc(sec, i, reloc, &symndx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) default: return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) reloc->sec = sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) reloc->idx = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) reloc->sym = find_symbol_by_index(elf, symndx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) if (!reloc->sym) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) WARN("can't find reloc entry symbol %d for %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) symndx, sec->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) elf_add_reloc(elf, reloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) nr_reloc++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) max_reloc = max(max_reloc, nr_reloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) tot_reloc += nr_reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (stats) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) printf("max_reloc: %lu\n", max_reloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) printf("tot_reloc: %lu\n", tot_reloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) struct elf *elf_open_read(const char *name, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) struct elf *elf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) Elf_Cmd cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) elf_version(EV_CURRENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) elf = malloc(sizeof(*elf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (!elf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) memset(elf, 0, offsetof(struct elf, sections));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) INIT_LIST_HEAD(&elf->sections);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) elf_hash_init(elf->symbol_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) elf_hash_init(elf->symbol_name_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) elf_hash_init(elf->section_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) elf_hash_init(elf->section_name_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) elf_hash_init(elf->reloc_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) elf->fd = open(name, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) if (elf->fd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) fprintf(stderr, "objtool: Can't open '%s': %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) name, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) if ((flags & O_ACCMODE) == O_RDONLY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) cmd = ELF_C_READ_MMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) else if ((flags & O_ACCMODE) == O_RDWR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) cmd = ELF_C_RDWR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) else /* O_WRONLY */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) cmd = ELF_C_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) elf->elf = elf_begin(elf->fd, cmd, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) if (!elf->elf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) WARN_ELF("elf_begin");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) if (!gelf_getehdr(elf->elf, &elf->ehdr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) WARN_ELF("gelf_getehdr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (read_sections(elf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) if (read_symbols(elf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (read_relocs(elf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) return elf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) elf_close(elf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) struct section *elf_create_section(struct elf *elf, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) unsigned int sh_flags, size_t entsize, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) struct section *sec, *shstrtab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) size_t size = entsize * nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) Elf_Scn *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) Elf_Data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) sec = malloc(sizeof(*sec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) if (!sec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) memset(sec, 0, sizeof(*sec));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) INIT_LIST_HEAD(&sec->symbol_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) INIT_LIST_HEAD(&sec->reloc_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) s = elf_newscn(elf->elf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) if (!s) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) WARN_ELF("elf_newscn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) sec->name = strdup(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) if (!sec->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) perror("strdup");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) sec->idx = elf_ndxscn(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) sec->len = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) sec->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) sec->data = elf_newdata(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (!sec->data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) WARN_ELF("elf_newdata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) sec->data->d_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) sec->data->d_align = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) if (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) sec->data->d_buf = malloc(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (!sec->data->d_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) memset(sec->data->d_buf, 0, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) if (!gelf_getshdr(s, &sec->sh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) WARN_ELF("gelf_getshdr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) sec->sh.sh_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) sec->sh.sh_entsize = entsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) sec->sh.sh_type = SHT_PROGBITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) sec->sh.sh_addralign = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) sec->sh.sh_flags = SHF_ALLOC | sh_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) /* Add section name to .shstrtab (or .strtab for Clang) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) shstrtab = find_section_by_name(elf, ".shstrtab");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (!shstrtab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) shstrtab = find_section_by_name(elf, ".strtab");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) if (!shstrtab) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) WARN("can't find .shstrtab or .strtab section");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) s = elf_getscn(elf->elf, shstrtab->idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) if (!s) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) WARN_ELF("elf_getscn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) data = elf_newdata(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (!data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) WARN_ELF("elf_newdata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) data->d_buf = sec->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) data->d_size = strlen(name) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) data->d_align = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) sec->sh.sh_name = shstrtab->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) shstrtab->len += strlen(name) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) shstrtab->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) list_add_tail(&sec->list, &elf->sections);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) elf_hash_add(elf->section_hash, &sec->hash, sec->idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) elf_hash_add(elf->section_name_hash, &sec->name_hash, str_hash(sec->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) elf->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) return sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) static struct section *elf_create_rel_reloc_section(struct elf *elf, struct section *base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) char *relocname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) relocname = malloc(strlen(base->name) + strlen(".rel") + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) if (!relocname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) strcpy(relocname, ".rel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) strcat(relocname, base->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) sec = elf_create_section(elf, relocname, 0, sizeof(GElf_Rel), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) free(relocname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) if (!sec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) base->reloc = sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) sec->base = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) sec->sh.sh_type = SHT_REL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) sec->sh.sh_addralign = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) sec->sh.sh_link = find_section_by_name(elf, ".symtab")->idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) sec->sh.sh_info = base->idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) sec->sh.sh_flags = SHF_INFO_LINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) return sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) static struct section *elf_create_rela_reloc_section(struct elf *elf, struct section *base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) char *relocname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) relocname = malloc(strlen(base->name) + strlen(".rela") + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) if (!relocname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) strcpy(relocname, ".rela");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) strcat(relocname, base->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) sec = elf_create_section(elf, relocname, 0, sizeof(GElf_Rela), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) free(relocname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) if (!sec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) base->reloc = sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) sec->base = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) sec->sh.sh_type = SHT_RELA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) sec->sh.sh_addralign = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) sec->sh.sh_link = find_section_by_name(elf, ".symtab")->idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) sec->sh.sh_info = base->idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) sec->sh.sh_flags = SHF_INFO_LINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) return sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) struct section *elf_create_reloc_section(struct elf *elf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) struct section *base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) int reltype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) switch (reltype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) case SHT_REL: return elf_create_rel_reloc_section(elf, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) case SHT_RELA: return elf_create_rela_reloc_section(elf, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) default: return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) static int elf_rebuild_rel_reloc_section(struct section *sec, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) struct reloc *reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) int idx = 0, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) GElf_Rel *relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) /* Allocate a buffer for relocations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) size = nr * sizeof(*relocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) relocs = malloc(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (!relocs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) sec->data->d_buf = relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) sec->data->d_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) sec->sh.sh_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) list_for_each_entry(reloc, &sec->reloc_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) relocs[idx].r_offset = reloc->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) relocs[idx].r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) idx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) static int elf_rebuild_rela_reloc_section(struct section *sec, int nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) struct reloc *reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) int idx = 0, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) GElf_Rela *relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) /* Allocate a buffer for relocations with addends */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) size = nr * sizeof(*relocs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) relocs = malloc(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (!relocs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) perror("malloc");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) sec->data->d_buf = relocs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) sec->data->d_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) sec->sh.sh_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) list_for_each_entry(reloc, &sec->reloc_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) relocs[idx].r_offset = reloc->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) relocs[idx].r_addend = reloc->addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) relocs[idx].r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) idx++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) int elf_rebuild_reloc_section(struct elf *elf, struct section *sec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) struct reloc *reloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) int nr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) sec->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) elf->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) nr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) list_for_each_entry(reloc, &sec->reloc_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) nr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) switch (sec->sh.sh_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) case SHT_REL: return elf_rebuild_rel_reloc_section(sec, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) case SHT_RELA: return elf_rebuild_rela_reloc_section(sec, nr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) default: return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) int elf_write_insn(struct elf *elf, struct section *sec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) unsigned long offset, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) const char *insn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) Elf_Data *data = sec->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (data->d_type != ELF_T_BYTE || data->d_off) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) WARN("write to unexpected data for section: %s", sec->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) memcpy(data->d_buf + offset, insn, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) elf_flagdata(data, ELF_C_SET, ELF_F_DIRTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) elf->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) int elf_write_reloc(struct elf *elf, struct reloc *reloc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) struct section *sec = reloc->sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) if (sec->sh.sh_type == SHT_REL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) reloc->rel.r_offset = reloc->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) if (!gelf_update_rel(sec->data, reloc->idx, &reloc->rel)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) WARN_ELF("gelf_update_rel");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) reloc->rela.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) reloc->rela.r_addend = reloc->addend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) reloc->rela.r_offset = reloc->offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) if (!gelf_update_rela(sec->data, reloc->idx, &reloc->rela)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) WARN_ELF("gelf_update_rela");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) elf->changed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) int elf_write(struct elf *elf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) struct section *sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) Elf_Scn *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) /* Update section headers for changed sections: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) list_for_each_entry(sec, &elf->sections, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) if (sec->changed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) s = elf_getscn(elf->elf, sec->idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) if (!s) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) WARN_ELF("elf_getscn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) if (!gelf_update_shdr(s, &sec->sh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) WARN_ELF("gelf_update_shdr");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) sec->changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) /* Make sure the new section header entries get updated properly. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) elf_flagelf(elf->elf, ELF_C_SET, ELF_F_DIRTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) /* Write all changes to the file. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) if (elf_update(elf->elf, ELF_C_WRITE) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) WARN_ELF("elf_update");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) elf->changed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) void elf_close(struct elf *elf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) struct section *sec, *tmpsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) struct symbol *sym, *tmpsym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) struct reloc *reloc, *tmpreloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) if (elf->elf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) elf_end(elf->elf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) if (elf->fd > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) close(elf->fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) list_for_each_entry_safe(sec, tmpsec, &elf->sections, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) list_for_each_entry_safe(sym, tmpsym, &sec->symbol_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) list_del(&sym->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) hash_del(&sym->hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) free(sym);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) list_for_each_entry_safe(reloc, tmpreloc, &sec->reloc_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) list_del(&reloc->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) hash_del(&reloc->hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) free(reloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) list_del(&sec->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) free(sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) free(elf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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