d2eea68e7d
One of the nice ideas behind paravirt is that CONFIG_XEN=y can be included in a standard configuration and be no worse for native booting than as a Xen guest. The glibc feature that supports the vDSO "nosegneg" note is designed specifically to make this easy. You just have to flip one bit at boot time. This patch makes Xen flip the bit, so a CONFIG_XEN=y kernel on bare hardware does not make glibc use the less-optimized library builds. Signed-off-by: Roland McGrath <roland@redhat.com> Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
632 lines
15 KiB
C
632 lines
15 KiB
C
#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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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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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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/*
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* Following symbols have been audited. There values are constant and do
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* not change if bzImage is loaded at a different physical address than
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* the address for which it has been compiled. Don't warn user about
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* absolute relocations present w.r.t these symbols.
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*/
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static const char* safe_abs_relocs[] = {
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"__kernel_vsyscall",
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"__kernel_rt_sigreturn",
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"__kernel_sigreturn",
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"SYSENTER_RETURN",
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"VDSO_NOTE_MASK",
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"xen_irq_disable_direct_reloc",
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"xen_save_fl_direct_reloc",
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};
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static int is_safe_abs_reloc(const char* sym_name)
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{
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int i, array_size;
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array_size = sizeof(safe_abs_relocs)/sizeof(char*);
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for(i = 0; i < array_size; i++) {
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if (!strcmp(sym_name, safe_abs_relocs[i]))
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/* Match found */
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return 1;
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}
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if (strncmp(sym_name, "__crc_", 6) == 0)
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return 1;
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return 0;
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}
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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 < ARRAY_SIZE(type_name)) {
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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 < ARRAY_SIZE(bind_name)) {
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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 < ARRAY_SIZE(visibility_name)) {
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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 < ARRAY_SIZE(type_name)) {
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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, printed = 0;
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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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/* Absolute symbols are not relocated if bzImage is
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* loaded at a non-compiled address. Display a warning
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* to user at compile time about the absolute
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* relocations present.
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*
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* User need to audit the code to make sure
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* some symbols which should have been section
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* relative have not become absolute because of some
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* linker optimization or wrong programming usage.
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*
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* Before warning check if this absolute symbol
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* relocation is harmless.
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*/
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if (is_safe_abs_reloc(name))
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continue;
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if (!printed) {
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printf("WARNING: Absolute relocations"
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" present\n");
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printf("Offset Info Type Sym.Value "
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"Sym.Name\n");
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printed = 1;
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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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if (printed)
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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))
|
|
{
|
|
int i;
|
|
/* Walk through the relocations */
|
|
for(i = 0; i < ehdr.e_shnum; i++) {
|
|
char *sym_strtab;
|
|
Elf32_Sym *sh_symtab;
|
|
unsigned sec_applies, sec_symtab;
|
|
int j;
|
|
if (shdr[i].sh_type != SHT_REL) {
|
|
continue;
|
|
}
|
|
sec_symtab = shdr[i].sh_link;
|
|
sec_applies = shdr[i].sh_info;
|
|
if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
|
|
continue;
|
|
}
|
|
sh_symtab = symtab[sec_symtab];
|
|
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("relocs [--abs-syms |--abs-relocs | --text] vmlinux\n");
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int show_absolute_syms, show_absolute_relocs;
|
|
int as_text;
|
|
const char *fname;
|
|
FILE *fp;
|
|
int i;
|
|
|
|
show_absolute_syms = 0;
|
|
show_absolute_relocs = 0;
|
|
as_text = 0;
|
|
fname = NULL;
|
|
for(i = 1; i < argc; i++) {
|
|
char *arg = argv[i];
|
|
if (*arg == '-') {
|
|
if (strcmp(argv[1], "--abs-syms") == 0) {
|
|
show_absolute_syms = 1;
|
|
continue;
|
|
}
|
|
|
|
if (strcmp(argv[1], "--abs-relocs") == 0) {
|
|
show_absolute_relocs = 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_syms) {
|
|
print_absolute_symbols();
|
|
return 0;
|
|
}
|
|
if (show_absolute_relocs) {
|
|
print_absolute_relocs();
|
|
return 0;
|
|
}
|
|
emit_relocs(as_text);
|
|
return 0;
|
|
}
|