[PATCH] i386: Relocatable kernel support
This patch modifies the i386 kernel so that if CONFIG_RELOCATABLE is selected it will be able to be loaded at any 4K aligned address below 1G. The technique used is to compile the decompressor with -fPIC and modify it so the decompressor is fully relocatable. For the main kernel relocations are generated. Resulting in a kernel that is relocatable with no runtime overhead and no need to modify the source code. A reserved 32bit word in the parameters has been assigned to serve as a stack so we figure out where are running. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Eric W. Biederman
committed by
Andi Kleen
Andi Kleen
parent
fd593d1277
commit
968de4f026
563
arch/i386/boot/compressed/relocs.c
Normal file
563
arch/i386/boot/compressed/relocs.c
Normal file
@@ -0,0 +1,563 @@
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <elf.h>
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#include <byteswap.h>
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#define USE_BSD
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#include <endian.h>
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#define MAX_SHDRS 100
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static Elf32_Ehdr ehdr;
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static Elf32_Shdr shdr[MAX_SHDRS];
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static Elf32_Sym *symtab[MAX_SHDRS];
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static Elf32_Rel *reltab[MAX_SHDRS];
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static char *strtab[MAX_SHDRS];
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static unsigned long reloc_count, reloc_idx;
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static unsigned long *relocs;
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static void die(char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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exit(1);
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}
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static const char *sym_type(unsigned type)
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{
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static const char *type_name[] = {
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#define SYM_TYPE(X) [X] = #X
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SYM_TYPE(STT_NOTYPE),
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SYM_TYPE(STT_OBJECT),
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SYM_TYPE(STT_FUNC),
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SYM_TYPE(STT_SECTION),
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SYM_TYPE(STT_FILE),
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SYM_TYPE(STT_COMMON),
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SYM_TYPE(STT_TLS),
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#undef SYM_TYPE
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};
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const char *name = "unknown sym type name";
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if (type < sizeof(type_name)/sizeof(type_name[0])) {
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name = type_name[type];
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}
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return name;
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}
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static const char *sym_bind(unsigned bind)
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{
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static const char *bind_name[] = {
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#define SYM_BIND(X) [X] = #X
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SYM_BIND(STB_LOCAL),
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SYM_BIND(STB_GLOBAL),
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SYM_BIND(STB_WEAK),
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#undef SYM_BIND
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};
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const char *name = "unknown sym bind name";
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if (bind < sizeof(bind_name)/sizeof(bind_name[0])) {
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name = bind_name[bind];
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}
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return name;
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}
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static const char *sym_visibility(unsigned visibility)
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{
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static const char *visibility_name[] = {
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#define SYM_VISIBILITY(X) [X] = #X
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SYM_VISIBILITY(STV_DEFAULT),
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SYM_VISIBILITY(STV_INTERNAL),
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SYM_VISIBILITY(STV_HIDDEN),
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SYM_VISIBILITY(STV_PROTECTED),
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#undef SYM_VISIBILITY
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};
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const char *name = "unknown sym visibility name";
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if (visibility < sizeof(visibility_name)/sizeof(visibility_name[0])) {
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name = visibility_name[visibility];
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}
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return name;
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}
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static const char *rel_type(unsigned type)
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{
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static const char *type_name[] = {
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#define REL_TYPE(X) [X] = #X
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REL_TYPE(R_386_NONE),
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REL_TYPE(R_386_32),
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REL_TYPE(R_386_PC32),
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REL_TYPE(R_386_GOT32),
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REL_TYPE(R_386_PLT32),
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REL_TYPE(R_386_COPY),
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REL_TYPE(R_386_GLOB_DAT),
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REL_TYPE(R_386_JMP_SLOT),
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REL_TYPE(R_386_RELATIVE),
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REL_TYPE(R_386_GOTOFF),
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REL_TYPE(R_386_GOTPC),
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#undef REL_TYPE
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};
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const char *name = "unknown type rel type name";
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if (type < sizeof(type_name)/sizeof(type_name[0])) {
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name = type_name[type];
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}
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return name;
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}
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static const char *sec_name(unsigned shndx)
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{
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const char *sec_strtab;
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const char *name;
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sec_strtab = strtab[ehdr.e_shstrndx];
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name = "<noname>";
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if (shndx < ehdr.e_shnum) {
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name = sec_strtab + shdr[shndx].sh_name;
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}
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else if (shndx == SHN_ABS) {
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name = "ABSOLUTE";
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}
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else if (shndx == SHN_COMMON) {
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name = "COMMON";
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}
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return name;
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}
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static const char *sym_name(const char *sym_strtab, Elf32_Sym *sym)
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{
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const char *name;
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name = "<noname>";
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if (sym->st_name) {
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name = sym_strtab + sym->st_name;
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}
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else {
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name = sec_name(shdr[sym->st_shndx].sh_name);
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}
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return name;
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}
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define le16_to_cpu(val) (val)
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#define le32_to_cpu(val) (val)
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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#define le16_to_cpu(val) bswap_16(val)
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#define le32_to_cpu(val) bswap_32(val)
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#endif
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static uint16_t elf16_to_cpu(uint16_t val)
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{
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return le16_to_cpu(val);
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}
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static uint32_t elf32_to_cpu(uint32_t val)
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{
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return le32_to_cpu(val);
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}
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static void read_ehdr(FILE *fp)
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{
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if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
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die("Cannot read ELF header: %s\n",
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strerror(errno));
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}
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if (memcmp(ehdr.e_ident, ELFMAG, 4) != 0) {
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die("No ELF magic\n");
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}
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if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) {
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die("Not a 32 bit executable\n");
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}
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if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
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die("Not a LSB ELF executable\n");
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}
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if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
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die("Unknown ELF version\n");
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}
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/* Convert the fields to native endian */
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ehdr.e_type = elf16_to_cpu(ehdr.e_type);
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ehdr.e_machine = elf16_to_cpu(ehdr.e_machine);
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ehdr.e_version = elf32_to_cpu(ehdr.e_version);
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ehdr.e_entry = elf32_to_cpu(ehdr.e_entry);
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ehdr.e_phoff = elf32_to_cpu(ehdr.e_phoff);
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ehdr.e_shoff = elf32_to_cpu(ehdr.e_shoff);
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ehdr.e_flags = elf32_to_cpu(ehdr.e_flags);
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ehdr.e_ehsize = elf16_to_cpu(ehdr.e_ehsize);
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ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize);
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ehdr.e_phnum = elf16_to_cpu(ehdr.e_phnum);
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ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize);
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ehdr.e_shnum = elf16_to_cpu(ehdr.e_shnum);
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ehdr.e_shstrndx = elf16_to_cpu(ehdr.e_shstrndx);
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if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
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die("Unsupported ELF header type\n");
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}
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if (ehdr.e_machine != EM_386) {
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die("Not for x86\n");
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}
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if (ehdr.e_version != EV_CURRENT) {
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die("Unknown ELF version\n");
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}
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if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) {
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die("Bad Elf header size\n");
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}
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if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) {
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die("Bad program header entry\n");
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}
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if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) {
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die("Bad section header entry\n");
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}
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if (ehdr.e_shstrndx >= ehdr.e_shnum) {
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die("String table index out of bounds\n");
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}
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}
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static void read_shdrs(FILE *fp)
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{
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int i;
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if (ehdr.e_shnum > MAX_SHDRS) {
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die("%d section headers supported: %d\n",
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ehdr.e_shnum, MAX_SHDRS);
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}
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if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
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die("Seek to %d failed: %s\n",
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ehdr.e_shoff, strerror(errno));
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}
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if (fread(&shdr, sizeof(shdr[0]), ehdr.e_shnum, fp) != ehdr.e_shnum) {
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die("Cannot read ELF section headers: %s\n",
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strerror(errno));
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}
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for(i = 0; i < ehdr.e_shnum; i++) {
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shdr[i].sh_name = elf32_to_cpu(shdr[i].sh_name);
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shdr[i].sh_type = elf32_to_cpu(shdr[i].sh_type);
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shdr[i].sh_flags = elf32_to_cpu(shdr[i].sh_flags);
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shdr[i].sh_addr = elf32_to_cpu(shdr[i].sh_addr);
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shdr[i].sh_offset = elf32_to_cpu(shdr[i].sh_offset);
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shdr[i].sh_size = elf32_to_cpu(shdr[i].sh_size);
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shdr[i].sh_link = elf32_to_cpu(shdr[i].sh_link);
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shdr[i].sh_info = elf32_to_cpu(shdr[i].sh_info);
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shdr[i].sh_addralign = elf32_to_cpu(shdr[i].sh_addralign);
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shdr[i].sh_entsize = elf32_to_cpu(shdr[i].sh_entsize);
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}
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}
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static void read_strtabs(FILE *fp)
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{
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int i;
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for(i = 0; i < ehdr.e_shnum; i++) {
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if (shdr[i].sh_type != SHT_STRTAB) {
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continue;
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}
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strtab[i] = malloc(shdr[i].sh_size);
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if (!strtab[i]) {
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die("malloc of %d bytes for strtab failed\n",
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shdr[i].sh_size);
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}
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if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
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die("Seek to %d failed: %s\n",
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shdr[i].sh_offset, strerror(errno));
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}
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if (fread(strtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
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die("Cannot read symbol table: %s\n",
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strerror(errno));
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}
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}
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}
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static void read_symtabs(FILE *fp)
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{
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int i,j;
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for(i = 0; i < ehdr.e_shnum; i++) {
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if (shdr[i].sh_type != SHT_SYMTAB) {
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continue;
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}
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symtab[i] = malloc(shdr[i].sh_size);
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if (!symtab[i]) {
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die("malloc of %d bytes for symtab failed\n",
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shdr[i].sh_size);
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}
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if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
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die("Seek to %d failed: %s\n",
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shdr[i].sh_offset, strerror(errno));
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}
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if (fread(symtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
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die("Cannot read symbol table: %s\n",
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strerror(errno));
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}
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for(j = 0; j < shdr[i].sh_size/sizeof(symtab[i][0]); j++) {
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symtab[i][j].st_name = elf32_to_cpu(symtab[i][j].st_name);
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symtab[i][j].st_value = elf32_to_cpu(symtab[i][j].st_value);
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symtab[i][j].st_size = elf32_to_cpu(symtab[i][j].st_size);
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symtab[i][j].st_shndx = elf16_to_cpu(symtab[i][j].st_shndx);
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}
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}
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}
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static void read_relocs(FILE *fp)
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{
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int i,j;
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for(i = 0; i < ehdr.e_shnum; i++) {
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if (shdr[i].sh_type != SHT_REL) {
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continue;
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}
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reltab[i] = malloc(shdr[i].sh_size);
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if (!reltab[i]) {
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die("malloc of %d bytes for relocs failed\n",
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shdr[i].sh_size);
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}
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if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
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die("Seek to %d failed: %s\n",
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shdr[i].sh_offset, strerror(errno));
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}
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if (fread(reltab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
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die("Cannot read symbol table: %s\n",
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strerror(errno));
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}
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for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
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reltab[i][j].r_offset = elf32_to_cpu(reltab[i][j].r_offset);
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reltab[i][j].r_info = elf32_to_cpu(reltab[i][j].r_info);
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}
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}
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}
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static void print_absolute_symbols(void)
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{
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int i;
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printf("Absolute symbols\n");
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printf(" Num: Value Size Type Bind Visibility Name\n");
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for(i = 0; i < ehdr.e_shnum; i++) {
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char *sym_strtab;
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Elf32_Sym *sh_symtab;
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int j;
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if (shdr[i].sh_type != SHT_SYMTAB) {
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continue;
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}
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sh_symtab = symtab[i];
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sym_strtab = strtab[shdr[i].sh_link];
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for(j = 0; j < shdr[i].sh_size/sizeof(symtab[0][0]); j++) {
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Elf32_Sym *sym;
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const char *name;
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sym = &symtab[i][j];
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name = sym_name(sym_strtab, sym);
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if (sym->st_shndx != SHN_ABS) {
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continue;
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}
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printf("%5d %08x %5d %10s %10s %12s %s\n",
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j, sym->st_value, sym->st_size,
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sym_type(ELF32_ST_TYPE(sym->st_info)),
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sym_bind(ELF32_ST_BIND(sym->st_info)),
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sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)),
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name);
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}
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}
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printf("\n");
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}
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static void print_absolute_relocs(void)
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{
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int i;
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printf("Absolute relocations\n");
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printf("Offset Info Type Sym.Value Sym.Name\n");
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for(i = 0; i < ehdr.e_shnum; i++) {
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char *sym_strtab;
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Elf32_Sym *sh_symtab;
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unsigned sec_applies, sec_symtab;
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int j;
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if (shdr[i].sh_type != SHT_REL) {
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continue;
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}
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sec_symtab = shdr[i].sh_link;
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sec_applies = shdr[i].sh_info;
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if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
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continue;
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}
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sh_symtab = symtab[sec_symtab];
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sym_strtab = strtab[shdr[sec_symtab].sh_link];
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for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
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Elf32_Rel *rel;
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Elf32_Sym *sym;
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const char *name;
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rel = &reltab[i][j];
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sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
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name = sym_name(sym_strtab, sym);
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if (sym->st_shndx != SHN_ABS) {
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continue;
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}
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printf("%08x %08x %10s %08x %s\n",
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rel->r_offset,
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rel->r_info,
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rel_type(ELF32_R_TYPE(rel->r_info)),
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sym->st_value,
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name);
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}
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}
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printf("\n");
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}
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static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym))
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{
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int i;
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/* Walk through the relocations */
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for(i = 0; i < ehdr.e_shnum; i++) {
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char *sym_strtab;
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Elf32_Sym *sh_symtab;
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unsigned sec_applies, sec_symtab;
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int j;
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if (shdr[i].sh_type != SHT_REL) {
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continue;
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}
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sec_symtab = shdr[i].sh_link;
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sec_applies = shdr[i].sh_info;
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if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
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continue;
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}
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sh_symtab = symtab[sec_symtab];
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sym_strtab = strtab[shdr[sec_symtab].sh_link];
|
||||
for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
|
||||
Elf32_Rel *rel;
|
||||
Elf32_Sym *sym;
|
||||
unsigned r_type;
|
||||
rel = &reltab[i][j];
|
||||
sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
|
||||
r_type = ELF32_R_TYPE(rel->r_info);
|
||||
/* Don't visit relocations to absolute symbols */
|
||||
if (sym->st_shndx == SHN_ABS) {
|
||||
continue;
|
||||
}
|
||||
if (r_type == R_386_PC32) {
|
||||
/* PC relative relocations don't need to be adjusted */
|
||||
}
|
||||
else if (r_type == R_386_32) {
|
||||
/* Visit relocations that need to be adjusted */
|
||||
visit(rel, sym);
|
||||
}
|
||||
else {
|
||||
die("Unsupported relocation type: %d\n", r_type);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void count_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
|
||||
{
|
||||
reloc_count += 1;
|
||||
}
|
||||
|
||||
static void collect_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
|
||||
{
|
||||
/* Remember the address that needs to be adjusted. */
|
||||
relocs[reloc_idx++] = rel->r_offset;
|
||||
}
|
||||
|
||||
static int cmp_relocs(const void *va, const void *vb)
|
||||
{
|
||||
const unsigned long *a, *b;
|
||||
a = va; b = vb;
|
||||
return (*a == *b)? 0 : (*a > *b)? 1 : -1;
|
||||
}
|
||||
|
||||
static void emit_relocs(int as_text)
|
||||
{
|
||||
int i;
|
||||
/* Count how many relocations I have and allocate space for them. */
|
||||
reloc_count = 0;
|
||||
walk_relocs(count_reloc);
|
||||
relocs = malloc(reloc_count * sizeof(relocs[0]));
|
||||
if (!relocs) {
|
||||
die("malloc of %d entries for relocs failed\n",
|
||||
reloc_count);
|
||||
}
|
||||
/* Collect up the relocations */
|
||||
reloc_idx = 0;
|
||||
walk_relocs(collect_reloc);
|
||||
|
||||
/* Order the relocations for more efficient processing */
|
||||
qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs);
|
||||
|
||||
/* Print the relocations */
|
||||
if (as_text) {
|
||||
/* Print the relocations in a form suitable that
|
||||
* gas will like.
|
||||
*/
|
||||
printf(".section \".data.reloc\",\"a\"\n");
|
||||
printf(".balign 4\n");
|
||||
for(i = 0; i < reloc_count; i++) {
|
||||
printf("\t .long 0x%08lx\n", relocs[i]);
|
||||
}
|
||||
printf("\n");
|
||||
}
|
||||
else {
|
||||
unsigned char buf[4];
|
||||
buf[0] = buf[1] = buf[2] = buf[3] = 0;
|
||||
/* Print a stop */
|
||||
printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
|
||||
/* Now print each relocation */
|
||||
for(i = 0; i < reloc_count; i++) {
|
||||
buf[0] = (relocs[i] >> 0) & 0xff;
|
||||
buf[1] = (relocs[i] >> 8) & 0xff;
|
||||
buf[2] = (relocs[i] >> 16) & 0xff;
|
||||
buf[3] = (relocs[i] >> 24) & 0xff;
|
||||
printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void usage(void)
|
||||
{
|
||||
die("i386_reloc [--abs | --text] vmlinux\n");
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
int show_absolute;
|
||||
int as_text;
|
||||
const char *fname;
|
||||
FILE *fp;
|
||||
int i;
|
||||
|
||||
show_absolute = 0;
|
||||
as_text = 0;
|
||||
fname = NULL;
|
||||
for(i = 1; i < argc; i++) {
|
||||
char *arg = argv[i];
|
||||
if (*arg == '-') {
|
||||
if (strcmp(argv[1], "--abs") == 0) {
|
||||
show_absolute = 1;
|
||||
continue;
|
||||
}
|
||||
else if (strcmp(argv[1], "--text") == 0) {
|
||||
as_text = 1;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
else if (!fname) {
|
||||
fname = arg;
|
||||
continue;
|
||||
}
|
||||
usage();
|
||||
}
|
||||
if (!fname) {
|
||||
usage();
|
||||
}
|
||||
fp = fopen(fname, "r");
|
||||
if (!fp) {
|
||||
die("Cannot open %s: %s\n",
|
||||
fname, strerror(errno));
|
||||
}
|
||||
read_ehdr(fp);
|
||||
read_shdrs(fp);
|
||||
read_strtabs(fp);
|
||||
read_symtabs(fp);
|
||||
read_relocs(fp);
|
||||
if (show_absolute) {
|
||||
print_absolute_symbols();
|
||||
print_absolute_relocs();
|
||||
return 0;
|
||||
}
|
||||
emit_relocs(as_text);
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user