15 #include <elf.h>
348 static enum export export_from_secname(struct elf_info *elf, unsigned int sec)  in export_from_secname()  argument
350 	const char *secname = sec_name(elf, sec);  in export_from_secname()
366 static enum export export_from_sec(struct elf_info *elf, unsigned int sec)  in export_from_sec()  argument
368 	if (sec == elf->export_sec)  in export_from_sec()
370 	else if (sec == elf->export_unused_sec)  in export_from_sec()
372 	else if (sec == elf->export_gpl_sec)  in export_from_sec()
374 	else if (sec == elf->export_unused_gpl_sec)  in export_from_sec()
376 	else if (sec == elf->export_gpl_future_sec)  in export_from_sec()
438 	 * such as __*_veneer in ARM ELF.  in sym_set_crc()
498 	/* Is this a valid ELF file? */  in parse_elf()
503 		/* Not an ELF file - silently ignore it */  in parse_elf()
506 	/* Fix endianness in ELF header */  in parse_elf()
688 		/* symbol points to the CRC in the ELF object */  in handle_modversion()
821 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)  in sym_name()  argument
824 		return elf->strtab + sym->st_name;  in sym_name()
901 static void check_section(const char *modname, struct elf_info *elf,  in check_section()  argument
904 	const char *sec = sech_name(elf, sechdr);  in check_section()
1030 	void (*handler)(const char *modname, struct elf_info *elf,
1036 static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
1212  *   Hide section mismatch warnings for ELF local symbols.  The goal
1214  *   compiler-generated ELF local symbol names such as ".LANCHOR1".
1217  *   names to work.  (One situation where gcc can autogenerate ELF
1280 static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)  in is_valid_name()  argument
1282 	const char *name = elf->strtab + sym->st_name;  in is_valid_name()
1296 static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,  in find_elf_symbol()  argument
1312 	relsym_secindex = get_secindex(elf, relsym);  in find_elf_symbol()
1313 	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {  in find_elf_symbol()
1314 		if (get_secindex(elf, sym) != relsym_secindex)  in find_elf_symbol()
1318 		if (!is_valid_name(elf, sym))  in find_elf_symbol()
1341  * The ELF format may have a better way to detect what type of symbol
1344 static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,  in find_elf_symbol2()  argument
1351 	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {  in find_elf_symbol2()
1356 		symsec = sec_name(elf, get_secindex(elf, sym));  in find_elf_symbol2()
1359 		if (!is_valid_name(elf, sym))  in find_elf_symbol2()
1584 static void default_mismatch_handler(const char *modname, struct elf_info *elf,  in default_mismatch_handler()  argument
1594 	from = find_elf_symbol2(elf, r->r_offset, fromsec);  in default_mismatch_handler()
1595 	fromsym = sym_name(elf, from);  in default_mismatch_handler()
1600 	tosec = sec_name(elf, get_secindex(elf, sym));  in default_mismatch_handler()
1601 	to = find_elf_symbol(elf, r->r_addend, sym);  in default_mismatch_handler()
1602 	tosym = sym_name(elf, to);  in default_mismatch_handler()
1614 static int is_executable_section(struct elf_info* elf, unsigned int section_index)  in is_executable_section()  argument
1616 	if (section_index >= elf->num_sections)  in is_executable_section()
1617 		fatal("section_index is outside elf->num_sections!\n");  in is_executable_section()
1619 	return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);  in is_executable_section()
1659 static void report_extable_warnings(const char* modname, struct elf_info* elf,  in report_extable_warnings()  argument
1664 	Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);  in report_extable_warnings()
1665 	const char* fromsym_name = sym_name(elf, fromsym);  in report_extable_warnings()
1666 	Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);  in report_extable_warnings()
1667 	const char* tosym_name = sym_name(elf, tosym);  in report_extable_warnings()
1685 	    is_executable_section(elf, get_secindex(elf, sym)))  in report_extable_warnings()
1697 static void extable_mismatch_handler(const char* modname, struct elf_info *elf,  in extable_mismatch_handler()  argument
1702 	const char* tosec = sec_name(elf, get_secindex(elf, sym));  in extable_mismatch_handler()
1706 	report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);  in extable_mismatch_handler()
1715 	else if (!is_executable_section(elf, get_secindex(elf, sym))) {  in extable_mismatch_handler()
1733 static void check_section_mismatch(const char *modname, struct elf_info *elf,  in check_section_mismatch()  argument
1736 	const char *tosec = sec_name(elf, get_secindex(elf, sym));  in check_section_mismatch()
1741 			mismatch->handler(modname, elf,  mismatch,  in check_section_mismatch()
1744 			default_mismatch_handler(modname, elf, mismatch,  in check_section_mismatch()
1749 static unsigned int *reloc_location(struct elf_info *elf,  in reloc_location()  argument
1752 	return sym_get_data_by_offset(elf, sechdr->sh_info, r->r_offset);  in reloc_location()
1755 static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)  in addend_386_rel()  argument
1758 	unsigned int *location = reloc_location(elf, sechdr, r);  in addend_386_rel()
1767 		if (elf->hdr->e_type == ET_EXEC)  in addend_386_rel()
1798 static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)  in addend_arm_rel()  argument
1801 	Elf_Sym *sym = elf->symtab_start + ELF_R_SYM(r->r_info);  in addend_arm_rel()
1802 	void *loc = reloc_location(elf, sechdr, r);  in addend_arm_rel()
1822 		r->r_addend = (int)(long)(elf->hdr +  in addend_arm_rel()
1832 static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)  in addend_mips_rel()  argument
1835 	unsigned int *location = reloc_location(elf, sechdr, r);  in addend_mips_rel()
1863 static void section_rela(const char *modname, struct elf_info *elf,  in section_rela()  argument
1872 	Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;  in section_rela()
1875 	fromsec = sech_name(elf, sechdr);  in section_rela()
1884 		if (elf->hdr->e_machine == EM_MIPS) {  in section_rela()
1899 		switch (elf->hdr->e_machine) {  in section_rela()
1906 		sym = elf->symtab_start + r_sym;  in section_rela()
1912 		check_section_mismatch(modname, elf, &r, sym, fromsec);  in section_rela()
1916 static void section_rel(const char *modname, struct elf_info *elf,  in section_rel()  argument
1925 	Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;  in section_rel()
1928 	fromsec = sech_name(elf, sechdr);  in section_rel()
1937 		if (elf->hdr->e_machine == EM_MIPS) {  in section_rel()
1952 		switch (elf->hdr->e_machine) {  in section_rel()
1954 			if (addend_386_rel(elf, sechdr, &r))  in section_rel()
1958 			if (addend_arm_rel(elf, sechdr, &r))  in section_rel()
1962 			if (addend_mips_rel(elf, sechdr, &r))  in section_rel()
1966 		sym = elf->symtab_start + r_sym;  in section_rel()
1972 		check_section_mismatch(modname, elf, &r, sym, fromsec);  in section_rel()
1989 			  struct elf_info *elf)  in check_sec_ref()  argument
1992 	Elf_Shdr *sechdrs = elf->sechdrs;  in check_sec_ref()
1995 	for (i = 0; i < elf->num_sections; i++) {  in check_sec_ref()
1996 		check_section(modname, elf, &elf->sechdrs[i]);  in check_sec_ref()
1999 			section_rela(modname, elf, &elf->sechdrs[i]);  in check_sec_ref()
2001 			section_rel(modname, elf, &elf->sechdrs[i]);  in check_sec_ref()