arch/arm64/kernel/elfcore.c

Source file repositories/reference/linux-study-clean/arch/arm64/kernel/elfcore.c

File Facts

System
Linux kernel
Corpus path
arch/arm64/kernel/elfcore.c
Extension
.c
Size
2935 bytes
Lines
140
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!page) {
			dump_skip(cprm, MTE_PAGE_TAG_STORAGE);
			continue;
		}

		/*
		 * Pages mapped in user space as !pte_access_permitted() (e.g.
		 * PROT_EXEC only) may not have the PG_mte_tagged flag set.
		 */
		if (!page_mte_tagged(page)) {
			put_page(page);
			dump_skip(cprm, MTE_PAGE_TAG_STORAGE);
			continue;
		}

		if (!tags) {
			tags = mte_allocate_tag_storage();
			if (!tags) {
				put_page(page);
				ret = 0;
				break;
			}
		}

		mte_save_page_tags(page_address(page), tags);
		put_page(page);
		if (!dump_emit(cprm, tags, MTE_PAGE_TAG_STORAGE)) {
			ret = 0;
			break;
		}
	}

	if (tags)
		mte_free_tag_storage(tags);

	return ret;
}

Elf_Half elf_core_extra_phdrs(struct coredump_params *cprm)
{
	int i;
	struct core_vma_metadata *m;
	int vma_count = 0;

	for_each_mte_vma(cprm, i, m)
		vma_count++;

	return vma_count;
}

int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
{
	int i;
	struct core_vma_metadata *m;

	for_each_mte_vma(cprm, i, m) {
		struct elf_phdr phdr;

		phdr.p_type = PT_AARCH64_MEMTAG_MTE;
		phdr.p_offset = offset;
		phdr.p_vaddr = m->start;
		phdr.p_paddr = 0;
		phdr.p_filesz = mte_vma_tag_dump_size(m);
		phdr.p_memsz = m->end - m->start;
		offset += phdr.p_filesz;
		phdr.p_flags = 0;
		phdr.p_align = 0;

		if (!dump_emit(cprm, &phdr, sizeof(phdr)))
			return 0;
	}

	return 1;
}

size_t elf_core_extra_data_size(struct coredump_params *cprm)
{
	int i;
	struct core_vma_metadata *m;
	size_t data_size = 0;

	for_each_mte_vma(cprm, i, m)
		data_size += mte_vma_tag_dump_size(m);

	return data_size;
}

int elf_core_write_extra_data(struct coredump_params *cprm)
{
	int i;

Annotation

Implementation Notes