arch/sparc/vdso/vdso2c.h

Source file repositories/reference/linux-study-clean/arch/sparc/vdso/vdso2c.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/vdso/vdso2c.h
Extension
.h
Size
2963 bytes
Lines
100
Domain
Architecture Layer
Bucket
arch/sparc
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 (GET_BE(&pt[i].p_type) == PT_LOAD) {
			if (found_load)
				fail("multiple PT_LOAD segs\n");

			if (GET_BE(&pt[i].p_offset) != 0 ||
			    GET_BE(&pt[i].p_vaddr) != 0)
				fail("PT_LOAD in wrong place\n");

			if (GET_BE(&pt[i].p_memsz) != GET_BE(&pt[i].p_filesz))
				fail("cannot handle memsz != filesz\n");

			load_size = GET_BE(&pt[i].p_memsz);
			found_load = 1;
		} else if (GET_BE(&pt[i].p_type) == PT_DYNAMIC) {
			dyn = raw_addr + GET_BE(&pt[i].p_offset);
			dyn_end = raw_addr + GET_BE(&pt[i].p_offset) +
				GET_BE(&pt[i].p_memsz);
		}
	}
	if (!found_load)
		fail("no PT_LOAD seg\n");

	if (stripped_len < load_size)
		fail("stripped input is too short\n");

	/* Walk the dynamic table */
	for (i = 0; dyn + i < dyn_end &&
		     GET_BE(&dyn[i].d_tag) != DT_NULL; i++) {
		typeof(dyn[i].d_tag) tag = GET_BE(&dyn[i].d_tag);
		typeof(dyn[i].d_un.d_val) val = GET_BE(&dyn[i].d_un.d_val);

		if ((tag == DT_RELSZ || tag == DT_RELASZ) && (val != 0))
			fail("vdso image contains dynamic relocations\n");
	}

	/* Walk the section table */
	for (i = 0; i < GET_BE(&hdr->e_shnum); i++) {
		ELF(Shdr) *sh = raw_addr + GET_BE(&hdr->e_shoff) +
			GET_BE(&hdr->e_shentsize) * i;
		if (GET_BE(&sh->sh_type) == SHT_SYMTAB)
			symtab_hdr = sh;
	}

	if (!symtab_hdr)
		fail("no symbol table\n");

	if (!name) {
		fwrite(stripped_addr, stripped_len, 1, outfile);
		return;
	}

	mapping_size = (stripped_len + 8191) / 8192 * 8192;

	fprintf(outfile, "/* AUTOMATICALLY GENERATED -- DO NOT EDIT */\n\n");
	fprintf(outfile, "#include <linux/cache.h>\n");
	fprintf(outfile, "#include <asm/vdso.h>\n");
	fprintf(outfile, "\n");
	fprintf(outfile,
		"static unsigned char raw_data[%lu] __ro_after_init __aligned(8192)= {",
		mapping_size);
	for (j = 0; j < stripped_len; j++) {
		if (j % 10 == 0)
			fprintf(outfile, "\n\t");
		fprintf(outfile, "0x%02X, ",
			(int)((unsigned char *)stripped_addr)[j]);
	}
	fprintf(outfile, "\n};\n\n");

	fprintf(outfile, "const struct vdso_image %s_builtin = {\n", name);
	fprintf(outfile, "\t.data = raw_data,\n");
	fprintf(outfile, "\t.size = %lu,\n", mapping_size);
	fprintf(outfile, "};\n");
}

Annotation

Implementation Notes