tools/objtool/arch/loongarch/special.c

Source file repositories/reference/linux-study-clean/tools/objtool/arch/loongarch/special.c

File Facts

System
Linux kernel
Corpus path
tools/objtool/arch/loongarch/special.c
Extension
.c
Size
4949 bytes
Lines
202
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct table_info {
	struct list_head jump_info;
	unsigned long insn_offset;
	unsigned long rodata_offset;
};

static void get_rodata_table_size_by_table_annotate(struct objtool_file *file,
						    struct instruction *insn,
						    unsigned long *table_size)
{
	struct section *rsec;
	struct reloc *reloc;
	struct list_head table_list;
	struct table_info *orig_table;
	struct table_info *next_table;
	unsigned long tmp_insn_offset;
	unsigned long tmp_rodata_offset;
	bool is_valid_list = false;

	rsec = find_section_by_name(file->elf, ".rela.discard.tablejump_annotate");
	if (!rsec)
		return;

	INIT_LIST_HEAD(&table_list);

	for_each_reloc(rsec, reloc) {
		if (reloc->sym->sec->rodata)
			continue;

		if (strcmp(insn->sec->name, reloc->sym->sec->name))
			continue;

		orig_table = malloc(sizeof(struct table_info));
		if (!orig_table) {
			WARN("malloc failed");
			return;
		}

		orig_table->insn_offset = reloc->sym->offset + reloc_addend(reloc);
		reloc++;
		orig_table->rodata_offset = reloc->sym->offset + reloc_addend(reloc);

		list_add_tail(&orig_table->jump_info, &table_list);

		if (reloc_idx(reloc) + 1 == sec_num_entries(rsec))
			break;

		if (strcmp(insn->sec->name, (reloc + 1)->sym->sec->name)) {
			list_for_each_entry(orig_table, &table_list, jump_info) {
				if (orig_table->insn_offset == insn->offset) {
					is_valid_list = true;
					break;
				}
			}

			if (!is_valid_list) {
				list_del_init(&table_list);
				continue;
			}

			break;
		}
	}

	list_for_each_entry(orig_table, &table_list, jump_info) {
		next_table = list_next_entry(orig_table, jump_info);
		list_for_each_entry_from(next_table, &table_list, jump_info) {
			if (next_table->rodata_offset < orig_table->rodata_offset) {
				tmp_insn_offset = next_table->insn_offset;
				tmp_rodata_offset = next_table->rodata_offset;
				next_table->insn_offset = orig_table->insn_offset;
				next_table->rodata_offset = orig_table->rodata_offset;
				orig_table->insn_offset = tmp_insn_offset;
				orig_table->rodata_offset = tmp_rodata_offset;
			}
		}
	}

	list_for_each_entry(orig_table, &table_list, jump_info) {
		if (insn->offset == orig_table->insn_offset) {
			next_table = list_next_entry(orig_table, jump_info);
			if (&next_table->jump_info == &table_list) {
				*table_size = 0;
				return;
			}

			while (next_table->rodata_offset == orig_table->rodata_offset) {
				next_table = list_next_entry(next_table, jump_info);
				if (&next_table->jump_info == &table_list) {
					*table_size = 0;

Annotation

Implementation Notes