--- /dev/null
+From 6520fe5564acf07ade7b18a1272db1184835c487 Mon Sep 17 00:00:00 2001
+From: "H. Peter Anvin" <hpa@linux.intel.com>
+Date: Tue, 8 May 2012 21:22:24 +0300
+Subject: x86, realmode: 16-bit real-mode code support for relocs tool
+
+From: "H. Peter Anvin" <hpa@linux.intel.com>
+
+commit 6520fe5564acf07ade7b18a1272db1184835c487 upstream.
+
+A new option is added to the relocs tool called '--realmode'.
+This option causes the generation of 16-bit segment relocations
+and 32-bit linear relocations for the real-mode code. When
+the real-mode code is moved to the low-memory during kernel
+initialization, these relocation entries can be used to
+relocate the code properly.
+
+In the assembly code 16-bit segment relocations must be relative
+to the 'real_mode_seg' absolute symbol. Linear relocations must be
+relative to a symbol prefixed with 'pa_'.
+
+16-bit segment relocation is used to load cs:ip in 16-bit code.
+Linear relocations are used in the 32-bit code for relocatable
+data references. They are declared in the linker script of the
+real-mode code.
+
+The relocs tool is moved to arch/x86/tools/relocs.c, and added new
+target archscripts that can be used to build scripts needed building
+an architecture. be compiled before building the arch/x86 tree.
+
+[ hpa: accelerating this because it detects invalid absolute
+ relocations, a serious bug in binutils 2.22.52.0.x which currently
+ produces bad kernels. ]
+
+[ jsakkine: applied against 3.3.7 ]
+
+Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
+Link: http://lkml.kernel.org/r/1336501366-28617-2-git-send-email-jarkko.sakkinen@intel.com
+Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
+Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
+Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@iki.fi>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ Makefile | 9
+ arch/x86/Makefile | 3
+ arch/x86/boot/compressed/Makefile | 9
+ arch/x86/boot/compressed/relocs.c | 680 --------------------------------
+ arch/x86/tools/.gitignore | 1
+ arch/x86/tools/Makefile | 4
+ arch/x86/tools/relocs.c | 797 ++++++++++++++++++++++++++++++++++++++
+ scripts/Makefile | 2
+ 8 files changed, 817 insertions(+), 688 deletions(-)
+ delete mode 100644 arch/x86/boot/compressed/relocs.c
+ create mode 100644 arch/x86/tools/.gitignore
+ create mode 100644 arch/x86/tools/relocs.c
+
+--- a/Makefile
++++ b/Makefile
+@@ -442,7 +442,7 @@ asm-generic:
+
+ no-dot-config-targets := clean mrproper distclean \
+ cscope gtags TAGS tags help %docs check% coccicheck \
+- include/linux/version.h headers_% archheaders \
++ include/linux/version.h headers_% archheaders archscripts \
+ kernelversion %src-pkg
+
+ config-targets := 0
+@@ -979,7 +979,7 @@ prepare1: prepare2 include/linux/version
+ include/config/auto.conf
+ $(cmd_crmodverdir)
+
+-archprepare: archheaders prepare1 scripts_basic
++archprepare: archheaders archscripts prepare1 scripts_basic
+
+ prepare0: archprepare FORCE
+ $(Q)$(MAKE) $(build)=.
+@@ -1049,8 +1049,11 @@ hdr-dst = $(if $(KBUILD_HEADERS), dst=in
+ PHONY += archheaders
+ archheaders:
+
++PHONY += archscripts
++archscripts:
++
+ PHONY += __headers
+-__headers: include/linux/version.h scripts_basic asm-generic archheaders FORCE
++__headers: include/linux/version.h scripts_basic asm-generic archheaders archscripts FORCE
+ $(Q)$(MAKE) $(build)=scripts build_unifdef
+
+ PHONY += headers_install_all
+--- a/arch/x86/Makefile
++++ b/arch/x86/Makefile
+@@ -117,6 +117,9 @@ KBUILD_CFLAGS += $(call cc-option,-mno-s
+ KBUILD_CFLAGS += $(mflags-y)
+ KBUILD_AFLAGS += $(mflags-y)
+
++archscripts:
++ $(Q)$(MAKE) $(build)=arch/x86/tools relocs
++
+ ###
+ # Syscall table generation
+
+--- a/arch/x86/boot/compressed/Makefile
++++ b/arch/x86/boot/compressed/Makefile
+@@ -40,13 +40,12 @@ OBJCOPYFLAGS_vmlinux.bin := -R .comment
+ $(obj)/vmlinux.bin: vmlinux FORCE
+ $(call if_changed,objcopy)
+
++targets += vmlinux.bin.all vmlinux.relocs
+
+-targets += vmlinux.bin.all vmlinux.relocs relocs
+-hostprogs-$(CONFIG_X86_NEED_RELOCS) += relocs
+-
++CMD_RELOCS = arch/x86/tools/relocs
+ quiet_cmd_relocs = RELOCS $@
+- cmd_relocs = $(obj)/relocs $< > $@;$(obj)/relocs --abs-relocs $<
+-$(obj)/vmlinux.relocs: vmlinux $(obj)/relocs FORCE
++ cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
++$(obj)/vmlinux.relocs: vmlinux FORCE
+ $(call if_changed,relocs)
+
+ vmlinux.bin.all-y := $(obj)/vmlinux.bin
+--- a/arch/x86/boot/compressed/relocs.c
++++ /dev/null
+@@ -1,680 +0,0 @@
+-#include <stdio.h>
+-#include <stdarg.h>
+-#include <stdlib.h>
+-#include <stdint.h>
+-#include <string.h>
+-#include <errno.h>
+-#include <unistd.h>
+-#include <elf.h>
+-#include <byteswap.h>
+-#define USE_BSD
+-#include <endian.h>
+-#include <regex.h>
+-
+-static void die(char *fmt, ...);
+-
+-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+-static Elf32_Ehdr ehdr;
+-static unsigned long reloc_count, reloc_idx;
+-static unsigned long *relocs;
+-
+-struct section {
+- Elf32_Shdr shdr;
+- struct section *link;
+- Elf32_Sym *symtab;
+- Elf32_Rel *reltab;
+- char *strtab;
+-};
+-static struct section *secs;
+-
+-/*
+- * Following symbols have been audited. There values are constant and do
+- * not change if bzImage is loaded at a different physical address than
+- * the address for which it has been compiled. Don't warn user about
+- * absolute relocations present w.r.t these symbols.
+- */
+-static const char abs_sym_regex[] =
+- "^(xen_irq_disable_direct_reloc$|"
+- "xen_save_fl_direct_reloc$|"
+- "VDSO|"
+- "__crc_)";
+-static regex_t abs_sym_regex_c;
+-static int is_abs_reloc(const char *sym_name)
+-{
+- return !regexec(&abs_sym_regex_c, sym_name, 0, NULL, 0);
+-}
+-
+-/*
+- * These symbols are known to be relative, even if the linker marks them
+- * as absolute (typically defined outside any section in the linker script.)
+- */
+-static const char rel_sym_regex[] =
+- "^_end$";
+-static regex_t rel_sym_regex_c;
+-static int is_rel_reloc(const char *sym_name)
+-{
+- return !regexec(&rel_sym_regex_c, sym_name, 0, NULL, 0);
+-}
+-
+-static void regex_init(void)
+-{
+- char errbuf[128];
+- int err;
+-
+- err = regcomp(&abs_sym_regex_c, abs_sym_regex,
+- REG_EXTENDED|REG_NOSUB);
+- if (err) {
+- regerror(err, &abs_sym_regex_c, errbuf, sizeof errbuf);
+- die("%s", errbuf);
+- }
+-
+- err = regcomp(&rel_sym_regex_c, rel_sym_regex,
+- REG_EXTENDED|REG_NOSUB);
+- if (err) {
+- regerror(err, &rel_sym_regex_c, errbuf, sizeof errbuf);
+- die("%s", errbuf);
+- }
+-}
+-
+-static void die(char *fmt, ...)
+-{
+- va_list ap;
+- va_start(ap, fmt);
+- vfprintf(stderr, fmt, ap);
+- va_end(ap);
+- exit(1);
+-}
+-
+-static const char *sym_type(unsigned type)
+-{
+- static const char *type_name[] = {
+-#define SYM_TYPE(X) [X] = #X
+- SYM_TYPE(STT_NOTYPE),
+- SYM_TYPE(STT_OBJECT),
+- SYM_TYPE(STT_FUNC),
+- SYM_TYPE(STT_SECTION),
+- SYM_TYPE(STT_FILE),
+- SYM_TYPE(STT_COMMON),
+- SYM_TYPE(STT_TLS),
+-#undef SYM_TYPE
+- };
+- const char *name = "unknown sym type name";
+- if (type < ARRAY_SIZE(type_name)) {
+- name = type_name[type];
+- }
+- return name;
+-}
+-
+-static const char *sym_bind(unsigned bind)
+-{
+- static const char *bind_name[] = {
+-#define SYM_BIND(X) [X] = #X
+- SYM_BIND(STB_LOCAL),
+- SYM_BIND(STB_GLOBAL),
+- SYM_BIND(STB_WEAK),
+-#undef SYM_BIND
+- };
+- const char *name = "unknown sym bind name";
+- if (bind < ARRAY_SIZE(bind_name)) {
+- name = bind_name[bind];
+- }
+- return name;
+-}
+-
+-static const char *sym_visibility(unsigned visibility)
+-{
+- static const char *visibility_name[] = {
+-#define SYM_VISIBILITY(X) [X] = #X
+- SYM_VISIBILITY(STV_DEFAULT),
+- SYM_VISIBILITY(STV_INTERNAL),
+- SYM_VISIBILITY(STV_HIDDEN),
+- SYM_VISIBILITY(STV_PROTECTED),
+-#undef SYM_VISIBILITY
+- };
+- const char *name = "unknown sym visibility name";
+- if (visibility < ARRAY_SIZE(visibility_name)) {
+- name = visibility_name[visibility];
+- }
+- return name;
+-}
+-
+-static const char *rel_type(unsigned type)
+-{
+- static const char *type_name[] = {
+-#define REL_TYPE(X) [X] = #X
+- REL_TYPE(R_386_NONE),
+- REL_TYPE(R_386_32),
+- REL_TYPE(R_386_PC32),
+- REL_TYPE(R_386_GOT32),
+- REL_TYPE(R_386_PLT32),
+- REL_TYPE(R_386_COPY),
+- REL_TYPE(R_386_GLOB_DAT),
+- REL_TYPE(R_386_JMP_SLOT),
+- REL_TYPE(R_386_RELATIVE),
+- REL_TYPE(R_386_GOTOFF),
+- REL_TYPE(R_386_GOTPC),
+-#undef REL_TYPE
+- };
+- const char *name = "unknown type rel type name";
+- if (type < ARRAY_SIZE(type_name) && type_name[type]) {
+- name = type_name[type];
+- }
+- return name;
+-}
+-
+-static const char *sec_name(unsigned shndx)
+-{
+- const char *sec_strtab;
+- const char *name;
+- sec_strtab = secs[ehdr.e_shstrndx].strtab;
+- name = "<noname>";
+- if (shndx < ehdr.e_shnum) {
+- name = sec_strtab + secs[shndx].shdr.sh_name;
+- }
+- else if (shndx == SHN_ABS) {
+- name = "ABSOLUTE";
+- }
+- else if (shndx == SHN_COMMON) {
+- name = "COMMON";
+- }
+- return name;
+-}
+-
+-static const char *sym_name(const char *sym_strtab, Elf32_Sym *sym)
+-{
+- const char *name;
+- name = "<noname>";
+- if (sym->st_name) {
+- name = sym_strtab + sym->st_name;
+- }
+- else {
+- name = sec_name(secs[sym->st_shndx].shdr.sh_name);
+- }
+- return name;
+-}
+-
+-
+-
+-#if BYTE_ORDER == LITTLE_ENDIAN
+-#define le16_to_cpu(val) (val)
+-#define le32_to_cpu(val) (val)
+-#endif
+-#if BYTE_ORDER == BIG_ENDIAN
+-#define le16_to_cpu(val) bswap_16(val)
+-#define le32_to_cpu(val) bswap_32(val)
+-#endif
+-
+-static uint16_t elf16_to_cpu(uint16_t val)
+-{
+- return le16_to_cpu(val);
+-}
+-
+-static uint32_t elf32_to_cpu(uint32_t val)
+-{
+- return le32_to_cpu(val);
+-}
+-
+-static void read_ehdr(FILE *fp)
+-{
+- if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
+- die("Cannot read ELF header: %s\n",
+- strerror(errno));
+- }
+- if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
+- die("No ELF magic\n");
+- }
+- if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) {
+- die("Not a 32 bit executable\n");
+- }
+- if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
+- die("Not a LSB ELF executable\n");
+- }
+- if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
+- die("Unknown ELF version\n");
+- }
+- /* Convert the fields to native endian */
+- ehdr.e_type = elf16_to_cpu(ehdr.e_type);
+- ehdr.e_machine = elf16_to_cpu(ehdr.e_machine);
+- ehdr.e_version = elf32_to_cpu(ehdr.e_version);
+- ehdr.e_entry = elf32_to_cpu(ehdr.e_entry);
+- ehdr.e_phoff = elf32_to_cpu(ehdr.e_phoff);
+- ehdr.e_shoff = elf32_to_cpu(ehdr.e_shoff);
+- ehdr.e_flags = elf32_to_cpu(ehdr.e_flags);
+- ehdr.e_ehsize = elf16_to_cpu(ehdr.e_ehsize);
+- ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize);
+- ehdr.e_phnum = elf16_to_cpu(ehdr.e_phnum);
+- ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize);
+- ehdr.e_shnum = elf16_to_cpu(ehdr.e_shnum);
+- ehdr.e_shstrndx = elf16_to_cpu(ehdr.e_shstrndx);
+-
+- if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
+- die("Unsupported ELF header type\n");
+- }
+- if (ehdr.e_machine != EM_386) {
+- die("Not for x86\n");
+- }
+- if (ehdr.e_version != EV_CURRENT) {
+- die("Unknown ELF version\n");
+- }
+- if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) {
+- die("Bad Elf header size\n");
+- }
+- if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) {
+- die("Bad program header entry\n");
+- }
+- if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) {
+- die("Bad section header entry\n");
+- }
+- if (ehdr.e_shstrndx >= ehdr.e_shnum) {
+- die("String table index out of bounds\n");
+- }
+-}
+-
+-static void read_shdrs(FILE *fp)
+-{
+- int i;
+- Elf32_Shdr shdr;
+-
+- secs = calloc(ehdr.e_shnum, sizeof(struct section));
+- if (!secs) {
+- die("Unable to allocate %d section headers\n",
+- ehdr.e_shnum);
+- }
+- if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
+- die("Seek to %d failed: %s\n",
+- ehdr.e_shoff, strerror(errno));
+- }
+- for (i = 0; i < ehdr.e_shnum; i++) {
+- struct section *sec = &secs[i];
+- if (fread(&shdr, sizeof shdr, 1, fp) != 1)
+- die("Cannot read ELF section headers %d/%d: %s\n",
+- i, ehdr.e_shnum, strerror(errno));
+- sec->shdr.sh_name = elf32_to_cpu(shdr.sh_name);
+- sec->shdr.sh_type = elf32_to_cpu(shdr.sh_type);
+- sec->shdr.sh_flags = elf32_to_cpu(shdr.sh_flags);
+- sec->shdr.sh_addr = elf32_to_cpu(shdr.sh_addr);
+- sec->shdr.sh_offset = elf32_to_cpu(shdr.sh_offset);
+- sec->shdr.sh_size = elf32_to_cpu(shdr.sh_size);
+- sec->shdr.sh_link = elf32_to_cpu(shdr.sh_link);
+- sec->shdr.sh_info = elf32_to_cpu(shdr.sh_info);
+- sec->shdr.sh_addralign = elf32_to_cpu(shdr.sh_addralign);
+- sec->shdr.sh_entsize = elf32_to_cpu(shdr.sh_entsize);
+- if (sec->shdr.sh_link < ehdr.e_shnum)
+- sec->link = &secs[sec->shdr.sh_link];
+- }
+-
+-}
+-
+-static void read_strtabs(FILE *fp)
+-{
+- int i;
+- for (i = 0; i < ehdr.e_shnum; i++) {
+- struct section *sec = &secs[i];
+- if (sec->shdr.sh_type != SHT_STRTAB) {
+- continue;
+- }
+- sec->strtab = malloc(sec->shdr.sh_size);
+- if (!sec->strtab) {
+- die("malloc of %d bytes for strtab failed\n",
+- sec->shdr.sh_size);
+- }
+- if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+- die("Seek to %d failed: %s\n",
+- sec->shdr.sh_offset, strerror(errno));
+- }
+- if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
+- != sec->shdr.sh_size) {
+- die("Cannot read symbol table: %s\n",
+- strerror(errno));
+- }
+- }
+-}
+-
+-static void read_symtabs(FILE *fp)
+-{
+- int i,j;
+- for (i = 0; i < ehdr.e_shnum; i++) {
+- struct section *sec = &secs[i];
+- if (sec->shdr.sh_type != SHT_SYMTAB) {
+- continue;
+- }
+- sec->symtab = malloc(sec->shdr.sh_size);
+- if (!sec->symtab) {
+- die("malloc of %d bytes for symtab failed\n",
+- sec->shdr.sh_size);
+- }
+- if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+- die("Seek to %d failed: %s\n",
+- sec->shdr.sh_offset, strerror(errno));
+- }
+- if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
+- != sec->shdr.sh_size) {
+- die("Cannot read symbol table: %s\n",
+- strerror(errno));
+- }
+- for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Sym); j++) {
+- Elf32_Sym *sym = &sec->symtab[j];
+- sym->st_name = elf32_to_cpu(sym->st_name);
+- sym->st_value = elf32_to_cpu(sym->st_value);
+- sym->st_size = elf32_to_cpu(sym->st_size);
+- sym->st_shndx = elf16_to_cpu(sym->st_shndx);
+- }
+- }
+-}
+-
+-
+-static void read_relocs(FILE *fp)
+-{
+- int i,j;
+- for (i = 0; i < ehdr.e_shnum; i++) {
+- struct section *sec = &secs[i];
+- if (sec->shdr.sh_type != SHT_REL) {
+- continue;
+- }
+- sec->reltab = malloc(sec->shdr.sh_size);
+- if (!sec->reltab) {
+- die("malloc of %d bytes for relocs failed\n",
+- sec->shdr.sh_size);
+- }
+- if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+- die("Seek to %d failed: %s\n",
+- sec->shdr.sh_offset, strerror(errno));
+- }
+- if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
+- != sec->shdr.sh_size) {
+- die("Cannot read symbol table: %s\n",
+- strerror(errno));
+- }
+- for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
+- Elf32_Rel *rel = &sec->reltab[j];
+- rel->r_offset = elf32_to_cpu(rel->r_offset);
+- rel->r_info = elf32_to_cpu(rel->r_info);
+- }
+- }
+-}
+-
+-
+-static void print_absolute_symbols(void)
+-{
+- int i;
+- printf("Absolute symbols\n");
+- printf(" Num: Value Size Type Bind Visibility Name\n");
+- for (i = 0; i < ehdr.e_shnum; i++) {
+- struct section *sec = &secs[i];
+- char *sym_strtab;
+- int j;
+-
+- if (sec->shdr.sh_type != SHT_SYMTAB) {
+- continue;
+- }
+- sym_strtab = sec->link->strtab;
+- for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Sym); j++) {
+- Elf32_Sym *sym;
+- const char *name;
+- sym = &sec->symtab[j];
+- name = sym_name(sym_strtab, sym);
+- if (sym->st_shndx != SHN_ABS) {
+- continue;
+- }
+- printf("%5d %08x %5d %10s %10s %12s %s\n",
+- j, sym->st_value, sym->st_size,
+- sym_type(ELF32_ST_TYPE(sym->st_info)),
+- sym_bind(ELF32_ST_BIND(sym->st_info)),
+- sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)),
+- name);
+- }
+- }
+- printf("\n");
+-}
+-
+-static void print_absolute_relocs(void)
+-{
+- int i, printed = 0;
+-
+- for (i = 0; i < ehdr.e_shnum; i++) {
+- struct section *sec = &secs[i];
+- struct section *sec_applies, *sec_symtab;
+- char *sym_strtab;
+- Elf32_Sym *sh_symtab;
+- int j;
+- if (sec->shdr.sh_type != SHT_REL) {
+- continue;
+- }
+- sec_symtab = sec->link;
+- sec_applies = &secs[sec->shdr.sh_info];
+- if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
+- continue;
+- }
+- sh_symtab = sec_symtab->symtab;
+- sym_strtab = sec_symtab->link->strtab;
+- for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
+- Elf32_Rel *rel;
+- Elf32_Sym *sym;
+- const char *name;
+- rel = &sec->reltab[j];
+- sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
+- name = sym_name(sym_strtab, sym);
+- if (sym->st_shndx != SHN_ABS) {
+- continue;
+- }
+-
+- /* Absolute symbols are not relocated if bzImage is
+- * loaded at a non-compiled address. Display a warning
+- * to user at compile time about the absolute
+- * relocations present.
+- *
+- * User need to audit the code to make sure
+- * some symbols which should have been section
+- * relative have not become absolute because of some
+- * linker optimization or wrong programming usage.
+- *
+- * Before warning check if this absolute symbol
+- * relocation is harmless.
+- */
+- if (is_abs_reloc(name) || is_rel_reloc(name))
+- continue;
+-
+- if (!printed) {
+- printf("WARNING: Absolute relocations"
+- " present\n");
+- printf("Offset Info Type Sym.Value "
+- "Sym.Name\n");
+- printed = 1;
+- }
+-
+- printf("%08x %08x %10s %08x %s\n",
+- rel->r_offset,
+- rel->r_info,
+- rel_type(ELF32_R_TYPE(rel->r_info)),
+- sym->st_value,
+- name);
+- }
+- }
+-
+- if (printed)
+- printf("\n");
+-}
+-
+-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;
+- struct section *sec_applies, *sec_symtab;
+- int j;
+- struct section *sec = &secs[i];
+-
+- if (sec->shdr.sh_type != SHT_REL) {
+- continue;
+- }
+- sec_symtab = sec->link;
+- sec_applies = &secs[sec->shdr.sh_info];
+- if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
+- continue;
+- }
+- sh_symtab = sec_symtab->symtab;
+- sym_strtab = sec_symtab->link->strtab;
+- for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
+- Elf32_Rel *rel;
+- Elf32_Sym *sym;
+- unsigned r_type;
+- rel = &sec->reltab[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 &&
+- !is_rel_reloc(sym_name(sym_strtab, sym))) {
+- continue;
+- }
+- switch (r_type) {
+- case R_386_NONE:
+- case R_386_PC32:
+- /*
+- * NONE can be ignored and and PC relative
+- * relocations don't need to be adjusted.
+- */
+- break;
+- case R_386_32:
+- /* Visit relocations that need to be adjusted */
+- visit(rel, sym);
+- break;
+- default:
+- die("Unsupported relocation type: %s (%d)\n",
+- rel_type(r_type), r_type);
+- break;
+- }
+- }
+- }
+-}
+-
+-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];
+- /* Print a stop */
+- fwrite("\0\0\0\0", 4, 1, stdout);
+- /* 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;
+- fwrite(buf, 4, 1, stdout);
+- }
+- }
+-}
+-
+-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;
+-
+- regex_init();
+-
+- 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;
+-}
+--- /dev/null
++++ b/arch/x86/tools/.gitignore
+@@ -0,0 +1 @@
++relocs
+--- a/arch/x86/tools/Makefile
++++ b/arch/x86/tools/Makefile
+@@ -36,3 +36,7 @@ HOSTCFLAGS_insn_sanity.o := -Wall -I$(ob
+ $(obj)/test_get_len.o: $(srctree)/arch/x86/lib/insn.c $(srctree)/arch/x86/lib/inat.c $(srctree)/arch/x86/include/asm/inat_types.h $(srctree)/arch/x86/include/asm/inat.h $(srctree)/arch/x86/include/asm/insn.h $(objtree)/arch/x86/lib/inat-tables.c
+
+ $(obj)/insn_sanity.o: $(srctree)/arch/x86/lib/insn.c $(srctree)/arch/x86/lib/inat.c $(srctree)/arch/x86/include/asm/inat_types.h $(srctree)/arch/x86/include/asm/inat.h $(srctree)/arch/x86/include/asm/insn.h $(objtree)/arch/x86/lib/inat-tables.c
++
++HOST_EXTRACFLAGS += -I$(srctree)/tools/include
++hostprogs-y += relocs
++relocs: $(obj)/relocs
+--- /dev/null
++++ b/arch/x86/tools/relocs.c
+@@ -0,0 +1,797 @@
++#include <stdio.h>
++#include <stdarg.h>
++#include <stdlib.h>
++#include <stdint.h>
++#include <string.h>
++#include <errno.h>
++#include <unistd.h>
++#include <elf.h>
++#include <byteswap.h>
++#define USE_BSD
++#include <endian.h>
++#include <regex.h>
++#include <tools/le_byteshift.h>
++
++static void die(char *fmt, ...);
++
++#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
++static Elf32_Ehdr ehdr;
++static unsigned long reloc_count, reloc_idx;
++static unsigned long *relocs;
++static unsigned long reloc16_count, reloc16_idx;
++static unsigned long *relocs16;
++
++struct section {
++ Elf32_Shdr shdr;
++ struct section *link;
++ Elf32_Sym *symtab;
++ Elf32_Rel *reltab;
++ char *strtab;
++};
++static struct section *secs;
++
++enum symtype {
++ S_ABS,
++ S_REL,
++ S_SEG,
++ S_LIN,
++ S_NSYMTYPES
++};
++
++static const char * const sym_regex_kernel[S_NSYMTYPES] = {
++/*
++ * Following symbols have been audited. There values are constant and do
++ * not change if bzImage is loaded at a different physical address than
++ * the address for which it has been compiled. Don't warn user about
++ * absolute relocations present w.r.t these symbols.
++ */
++ [S_ABS] =
++ "^(xen_irq_disable_direct_reloc$|"
++ "xen_save_fl_direct_reloc$|"
++ "VDSO|"
++ "__crc_)",
++
++/*
++ * These symbols are known to be relative, even if the linker marks them
++ * as absolute (typically defined outside any section in the linker script.)
++ */
++ [S_REL] =
++ "^_end$",
++};
++
++
++static const char * const sym_regex_realmode[S_NSYMTYPES] = {
++/*
++ * These are 16-bit segment symbols when compiling 16-bit code.
++ */
++ [S_SEG] =
++ "^real_mode_seg$",
++
++/*
++ * These are offsets belonging to segments, as opposed to linear addresses,
++ * when compiling 16-bit code.
++ */
++ [S_LIN] =
++ "^pa_",
++};
++
++static const char * const *sym_regex;
++
++static regex_t sym_regex_c[S_NSYMTYPES];
++static int is_reloc(enum symtype type, const char *sym_name)
++{
++ return sym_regex[type] &&
++ !regexec(&sym_regex_c[type], sym_name, 0, NULL, 0);
++}
++
++static void regex_init(int use_real_mode)
++{
++ char errbuf[128];
++ int err;
++ int i;
++
++ if (use_real_mode)
++ sym_regex = sym_regex_realmode;
++ else
++ sym_regex = sym_regex_kernel;
++
++ for (i = 0; i < S_NSYMTYPES; i++) {
++ if (!sym_regex[i])
++ continue;
++
++ err = regcomp(&sym_regex_c[i], sym_regex[i],
++ REG_EXTENDED|REG_NOSUB);
++
++ if (err) {
++ regerror(err, &sym_regex_c[i], errbuf, sizeof errbuf);
++ die("%s", errbuf);
++ }
++ }
++}
++
++static void die(char *fmt, ...)
++{
++ va_list ap;
++ va_start(ap, fmt);
++ vfprintf(stderr, fmt, ap);
++ va_end(ap);
++ exit(1);
++}
++
++static const char *sym_type(unsigned type)
++{
++ static const char *type_name[] = {
++#define SYM_TYPE(X) [X] = #X
++ SYM_TYPE(STT_NOTYPE),
++ SYM_TYPE(STT_OBJECT),
++ SYM_TYPE(STT_FUNC),
++ SYM_TYPE(STT_SECTION),
++ SYM_TYPE(STT_FILE),
++ SYM_TYPE(STT_COMMON),
++ SYM_TYPE(STT_TLS),
++#undef SYM_TYPE
++ };
++ const char *name = "unknown sym type name";
++ if (type < ARRAY_SIZE(type_name)) {
++ name = type_name[type];
++ }
++ return name;
++}
++
++static const char *sym_bind(unsigned bind)
++{
++ static const char *bind_name[] = {
++#define SYM_BIND(X) [X] = #X
++ SYM_BIND(STB_LOCAL),
++ SYM_BIND(STB_GLOBAL),
++ SYM_BIND(STB_WEAK),
++#undef SYM_BIND
++ };
++ const char *name = "unknown sym bind name";
++ if (bind < ARRAY_SIZE(bind_name)) {
++ name = bind_name[bind];
++ }
++ return name;
++}
++
++static const char *sym_visibility(unsigned visibility)
++{
++ static const char *visibility_name[] = {
++#define SYM_VISIBILITY(X) [X] = #X
++ SYM_VISIBILITY(STV_DEFAULT),
++ SYM_VISIBILITY(STV_INTERNAL),
++ SYM_VISIBILITY(STV_HIDDEN),
++ SYM_VISIBILITY(STV_PROTECTED),
++#undef SYM_VISIBILITY
++ };
++ const char *name = "unknown sym visibility name";
++ if (visibility < ARRAY_SIZE(visibility_name)) {
++ name = visibility_name[visibility];
++ }
++ return name;
++}
++
++static const char *rel_type(unsigned type)
++{
++ static const char *type_name[] = {
++#define REL_TYPE(X) [X] = #X
++ REL_TYPE(R_386_NONE),
++ REL_TYPE(R_386_32),
++ REL_TYPE(R_386_PC32),
++ REL_TYPE(R_386_GOT32),
++ REL_TYPE(R_386_PLT32),
++ REL_TYPE(R_386_COPY),
++ REL_TYPE(R_386_GLOB_DAT),
++ REL_TYPE(R_386_JMP_SLOT),
++ REL_TYPE(R_386_RELATIVE),
++ REL_TYPE(R_386_GOTOFF),
++ REL_TYPE(R_386_GOTPC),
++ REL_TYPE(R_386_8),
++ REL_TYPE(R_386_PC8),
++ REL_TYPE(R_386_16),
++ REL_TYPE(R_386_PC16),
++#undef REL_TYPE
++ };
++ const char *name = "unknown type rel type name";
++ if (type < ARRAY_SIZE(type_name) && type_name[type]) {
++ name = type_name[type];
++ }
++ return name;
++}
++
++static const char *sec_name(unsigned shndx)
++{
++ const char *sec_strtab;
++ const char *name;
++ sec_strtab = secs[ehdr.e_shstrndx].strtab;
++ name = "<noname>";
++ if (shndx < ehdr.e_shnum) {
++ name = sec_strtab + secs[shndx].shdr.sh_name;
++ }
++ else if (shndx == SHN_ABS) {
++ name = "ABSOLUTE";
++ }
++ else if (shndx == SHN_COMMON) {
++ name = "COMMON";
++ }
++ return name;
++}
++
++static const char *sym_name(const char *sym_strtab, Elf32_Sym *sym)
++{
++ const char *name;
++ name = "<noname>";
++ if (sym->st_name) {
++ name = sym_strtab + sym->st_name;
++ }
++ else {
++ name = sec_name(sym->st_shndx);
++ }
++ return name;
++}
++
++
++
++#if BYTE_ORDER == LITTLE_ENDIAN
++#define le16_to_cpu(val) (val)
++#define le32_to_cpu(val) (val)
++#endif
++#if BYTE_ORDER == BIG_ENDIAN
++#define le16_to_cpu(val) bswap_16(val)
++#define le32_to_cpu(val) bswap_32(val)
++#endif
++
++static uint16_t elf16_to_cpu(uint16_t val)
++{
++ return le16_to_cpu(val);
++}
++
++static uint32_t elf32_to_cpu(uint32_t val)
++{
++ return le32_to_cpu(val);
++}
++
++static void read_ehdr(FILE *fp)
++{
++ if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
++ die("Cannot read ELF header: %s\n",
++ strerror(errno));
++ }
++ if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
++ die("No ELF magic\n");
++ }
++ if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) {
++ die("Not a 32 bit executable\n");
++ }
++ if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
++ die("Not a LSB ELF executable\n");
++ }
++ if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
++ die("Unknown ELF version\n");
++ }
++ /* Convert the fields to native endian */
++ ehdr.e_type = elf16_to_cpu(ehdr.e_type);
++ ehdr.e_machine = elf16_to_cpu(ehdr.e_machine);
++ ehdr.e_version = elf32_to_cpu(ehdr.e_version);
++ ehdr.e_entry = elf32_to_cpu(ehdr.e_entry);
++ ehdr.e_phoff = elf32_to_cpu(ehdr.e_phoff);
++ ehdr.e_shoff = elf32_to_cpu(ehdr.e_shoff);
++ ehdr.e_flags = elf32_to_cpu(ehdr.e_flags);
++ ehdr.e_ehsize = elf16_to_cpu(ehdr.e_ehsize);
++ ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize);
++ ehdr.e_phnum = elf16_to_cpu(ehdr.e_phnum);
++ ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize);
++ ehdr.e_shnum = elf16_to_cpu(ehdr.e_shnum);
++ ehdr.e_shstrndx = elf16_to_cpu(ehdr.e_shstrndx);
++
++ if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
++ die("Unsupported ELF header type\n");
++ }
++ if (ehdr.e_machine != EM_386) {
++ die("Not for x86\n");
++ }
++ if (ehdr.e_version != EV_CURRENT) {
++ die("Unknown ELF version\n");
++ }
++ if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) {
++ die("Bad Elf header size\n");
++ }
++ if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) {
++ die("Bad program header entry\n");
++ }
++ if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) {
++ die("Bad section header entry\n");
++ }
++ if (ehdr.e_shstrndx >= ehdr.e_shnum) {
++ die("String table index out of bounds\n");
++ }
++}
++
++static void read_shdrs(FILE *fp)
++{
++ int i;
++ Elf32_Shdr shdr;
++
++ secs = calloc(ehdr.e_shnum, sizeof(struct section));
++ if (!secs) {
++ die("Unable to allocate %d section headers\n",
++ ehdr.e_shnum);
++ }
++ if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
++ die("Seek to %d failed: %s\n",
++ ehdr.e_shoff, strerror(errno));
++ }
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ struct section *sec = &secs[i];
++ if (fread(&shdr, sizeof shdr, 1, fp) != 1)
++ die("Cannot read ELF section headers %d/%d: %s\n",
++ i, ehdr.e_shnum, strerror(errno));
++ sec->shdr.sh_name = elf32_to_cpu(shdr.sh_name);
++ sec->shdr.sh_type = elf32_to_cpu(shdr.sh_type);
++ sec->shdr.sh_flags = elf32_to_cpu(shdr.sh_flags);
++ sec->shdr.sh_addr = elf32_to_cpu(shdr.sh_addr);
++ sec->shdr.sh_offset = elf32_to_cpu(shdr.sh_offset);
++ sec->shdr.sh_size = elf32_to_cpu(shdr.sh_size);
++ sec->shdr.sh_link = elf32_to_cpu(shdr.sh_link);
++ sec->shdr.sh_info = elf32_to_cpu(shdr.sh_info);
++ sec->shdr.sh_addralign = elf32_to_cpu(shdr.sh_addralign);
++ sec->shdr.sh_entsize = elf32_to_cpu(shdr.sh_entsize);
++ if (sec->shdr.sh_link < ehdr.e_shnum)
++ sec->link = &secs[sec->shdr.sh_link];
++ }
++
++}
++
++static void read_strtabs(FILE *fp)
++{
++ int i;
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ struct section *sec = &secs[i];
++ if (sec->shdr.sh_type != SHT_STRTAB) {
++ continue;
++ }
++ sec->strtab = malloc(sec->shdr.sh_size);
++ if (!sec->strtab) {
++ die("malloc of %d bytes for strtab failed\n",
++ sec->shdr.sh_size);
++ }
++ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
++ die("Seek to %d failed: %s\n",
++ sec->shdr.sh_offset, strerror(errno));
++ }
++ if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
++ != sec->shdr.sh_size) {
++ die("Cannot read symbol table: %s\n",
++ strerror(errno));
++ }
++ }
++}
++
++static void read_symtabs(FILE *fp)
++{
++ int i,j;
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ struct section *sec = &secs[i];
++ if (sec->shdr.sh_type != SHT_SYMTAB) {
++ continue;
++ }
++ sec->symtab = malloc(sec->shdr.sh_size);
++ if (!sec->symtab) {
++ die("malloc of %d bytes for symtab failed\n",
++ sec->shdr.sh_size);
++ }
++ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
++ die("Seek to %d failed: %s\n",
++ sec->shdr.sh_offset, strerror(errno));
++ }
++ if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
++ != sec->shdr.sh_size) {
++ die("Cannot read symbol table: %s\n",
++ strerror(errno));
++ }
++ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Sym); j++) {
++ Elf32_Sym *sym = &sec->symtab[j];
++ sym->st_name = elf32_to_cpu(sym->st_name);
++ sym->st_value = elf32_to_cpu(sym->st_value);
++ sym->st_size = elf32_to_cpu(sym->st_size);
++ sym->st_shndx = elf16_to_cpu(sym->st_shndx);
++ }
++ }
++}
++
++
++static void read_relocs(FILE *fp)
++{
++ int i,j;
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ struct section *sec = &secs[i];
++ if (sec->shdr.sh_type != SHT_REL) {
++ continue;
++ }
++ sec->reltab = malloc(sec->shdr.sh_size);
++ if (!sec->reltab) {
++ die("malloc of %d bytes for relocs failed\n",
++ sec->shdr.sh_size);
++ }
++ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
++ die("Seek to %d failed: %s\n",
++ sec->shdr.sh_offset, strerror(errno));
++ }
++ if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
++ != sec->shdr.sh_size) {
++ die("Cannot read symbol table: %s\n",
++ strerror(errno));
++ }
++ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
++ Elf32_Rel *rel = &sec->reltab[j];
++ rel->r_offset = elf32_to_cpu(rel->r_offset);
++ rel->r_info = elf32_to_cpu(rel->r_info);
++ }
++ }
++}
++
++
++static void print_absolute_symbols(void)
++{
++ int i;
++ printf("Absolute symbols\n");
++ printf(" Num: Value Size Type Bind Visibility Name\n");
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ struct section *sec = &secs[i];
++ char *sym_strtab;
++ int j;
++
++ if (sec->shdr.sh_type != SHT_SYMTAB) {
++ continue;
++ }
++ sym_strtab = sec->link->strtab;
++ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Sym); j++) {
++ Elf32_Sym *sym;
++ const char *name;
++ sym = &sec->symtab[j];
++ name = sym_name(sym_strtab, sym);
++ if (sym->st_shndx != SHN_ABS) {
++ continue;
++ }
++ printf("%5d %08x %5d %10s %10s %12s %s\n",
++ j, sym->st_value, sym->st_size,
++ sym_type(ELF32_ST_TYPE(sym->st_info)),
++ sym_bind(ELF32_ST_BIND(sym->st_info)),
++ sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)),
++ name);
++ }
++ }
++ printf("\n");
++}
++
++static void print_absolute_relocs(void)
++{
++ int i, printed = 0;
++
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ struct section *sec = &secs[i];
++ struct section *sec_applies, *sec_symtab;
++ char *sym_strtab;
++ Elf32_Sym *sh_symtab;
++ int j;
++ if (sec->shdr.sh_type != SHT_REL) {
++ continue;
++ }
++ sec_symtab = sec->link;
++ sec_applies = &secs[sec->shdr.sh_info];
++ if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
++ continue;
++ }
++ sh_symtab = sec_symtab->symtab;
++ sym_strtab = sec_symtab->link->strtab;
++ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
++ Elf32_Rel *rel;
++ Elf32_Sym *sym;
++ const char *name;
++ rel = &sec->reltab[j];
++ sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
++ name = sym_name(sym_strtab, sym);
++ if (sym->st_shndx != SHN_ABS) {
++ continue;
++ }
++
++ /* Absolute symbols are not relocated if bzImage is
++ * loaded at a non-compiled address. Display a warning
++ * to user at compile time about the absolute
++ * relocations present.
++ *
++ * User need to audit the code to make sure
++ * some symbols which should have been section
++ * relative have not become absolute because of some
++ * linker optimization or wrong programming usage.
++ *
++ * Before warning check if this absolute symbol
++ * relocation is harmless.
++ */
++ if (is_reloc(S_ABS, name) || is_reloc(S_REL, name))
++ continue;
++
++ if (!printed) {
++ printf("WARNING: Absolute relocations"
++ " present\n");
++ printf("Offset Info Type Sym.Value "
++ "Sym.Name\n");
++ printed = 1;
++ }
++
++ printf("%08x %08x %10s %08x %s\n",
++ rel->r_offset,
++ rel->r_info,
++ rel_type(ELF32_R_TYPE(rel->r_info)),
++ sym->st_value,
++ name);
++ }
++ }
++
++ if (printed)
++ printf("\n");
++}
++
++static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym),
++ int use_real_mode)
++{
++ int i;
++ /* Walk through the relocations */
++ for (i = 0; i < ehdr.e_shnum; i++) {
++ char *sym_strtab;
++ Elf32_Sym *sh_symtab;
++ struct section *sec_applies, *sec_symtab;
++ int j;
++ struct section *sec = &secs[i];
++
++ if (sec->shdr.sh_type != SHT_REL) {
++ continue;
++ }
++ sec_symtab = sec->link;
++ sec_applies = &secs[sec->shdr.sh_info];
++ if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
++ continue;
++ }
++ sh_symtab = sec_symtab->symtab;
++ sym_strtab = sec_symtab->link->strtab;
++ for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
++ Elf32_Rel *rel;
++ Elf32_Sym *sym;
++ unsigned r_type;
++ const char *symname;
++ rel = &sec->reltab[j];
++ sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
++ r_type = ELF32_R_TYPE(rel->r_info);
++
++ switch (r_type) {
++ case R_386_NONE:
++ case R_386_PC32:
++ case R_386_PC16:
++ case R_386_PC8:
++ /*
++ * NONE can be ignored and and PC relative
++ * relocations don't need to be adjusted.
++ */
++ break;
++
++ case R_386_16:
++ symname = sym_name(sym_strtab, sym);
++ if (!use_real_mode)
++ goto bad;
++ if (sym->st_shndx == SHN_ABS) {
++ if (is_reloc(S_ABS, symname))
++ break;
++ else if (!is_reloc(S_SEG, symname))
++ goto bad;
++ } else {
++ if (is_reloc(S_LIN, symname))
++ goto bad;
++ else
++ break;
++ }
++ visit(rel, sym);
++ break;
++
++ case R_386_32:
++ symname = sym_name(sym_strtab, sym);
++ if (sym->st_shndx == SHN_ABS) {
++ if (is_reloc(S_ABS, symname))
++ break;
++ else if (!is_reloc(S_REL, symname))
++ goto bad;
++ } else {
++ if (use_real_mode &&
++ !is_reloc(S_LIN, symname))
++ break;
++ }
++ visit(rel, sym);
++ break;
++ default:
++ die("Unsupported relocation type: %s (%d)\n",
++ rel_type(r_type), r_type);
++ break;
++ bad:
++ symname = sym_name(sym_strtab, sym);
++ die("Invalid %s relocation: %s\n",
++ rel_type(r_type), symname);
++ }
++ }
++ }
++}
++
++static void count_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
++{
++ if (ELF32_R_TYPE(rel->r_info) == R_386_16)
++ reloc16_count++;
++ else
++ reloc_count++;
++}
++
++static void collect_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
++{
++ /* Remember the address that needs to be adjusted. */
++ if (ELF32_R_TYPE(rel->r_info) == R_386_16)
++ relocs16[reloc16_idx++] = rel->r_offset;
++ else
++ 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 int write32(unsigned int v, FILE *f)
++{
++ unsigned char buf[4];
++
++ put_unaligned_le32(v, buf);
++ return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
++}
++
++static void emit_relocs(int as_text, int use_real_mode)
++{
++ int i;
++ /* Count how many relocations I have and allocate space for them. */
++ reloc_count = 0;
++ walk_relocs(count_reloc, use_real_mode);
++ relocs = malloc(reloc_count * sizeof(relocs[0]));
++ if (!relocs) {
++ die("malloc of %d entries for relocs failed\n",
++ reloc_count);
++ }
++
++ relocs16 = malloc(reloc16_count * sizeof(relocs[0]));
++ if (!relocs16) {
++ die("malloc of %d entries for relocs16 failed\n",
++ reloc16_count);
++ }
++ /* Collect up the relocations */
++ reloc_idx = 0;
++ walk_relocs(collect_reloc, use_real_mode);
++
++ if (reloc16_count && !use_real_mode)
++ die("Segment relocations found but --realmode not specified\n");
++
++ /* Order the relocations for more efficient processing */
++ qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs);
++ qsort(relocs16, reloc16_count, sizeof(relocs16[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");
++ if (use_real_mode) {
++ printf("\t.long %lu\n", reloc16_count);
++ for (i = 0; i < reloc16_count; i++)
++ printf("\t.long 0x%08lx\n", relocs16[i]);
++ printf("\t.long %lu\n", reloc_count);
++ for (i = 0; i < reloc_count; i++) {
++ printf("\t.long 0x%08lx\n", relocs[i]);
++ }
++ } else {
++ /* Print a stop */
++ printf("\t.long 0x%08lx\n", (unsigned long)0);
++ for (i = 0; i < reloc_count; i++) {
++ printf("\t.long 0x%08lx\n", relocs[i]);
++ }
++ }
++
++ printf("\n");
++ }
++ else {
++ if (use_real_mode) {
++ write32(reloc16_count, stdout);
++ for (i = 0; i < reloc16_count; i++)
++ write32(relocs16[i], stdout);
++ write32(reloc_count, stdout);
++
++ /* Now print each relocation */
++ for (i = 0; i < reloc_count; i++)
++ write32(relocs[i], stdout);
++ } else {
++ /* Print a stop */
++ write32(0, stdout);
++
++ /* Now print each relocation */
++ for (i = 0; i < reloc_count; i++) {
++ write32(relocs[i], stdout);
++ }
++ }
++ }
++}
++
++static void usage(void)
++{
++ die("relocs [--abs-syms|--abs-relocs|--text|--realmode] vmlinux\n");
++}
++
++int main(int argc, char **argv)
++{
++ int show_absolute_syms, show_absolute_relocs;
++ int as_text, use_real_mode;
++ const char *fname;
++ FILE *fp;
++ int i;
++
++ show_absolute_syms = 0;
++ show_absolute_relocs = 0;
++ as_text = 0;
++ use_real_mode = 0;
++ fname = NULL;
++ for (i = 1; i < argc; i++) {
++ char *arg = argv[i];
++ if (*arg == '-') {
++ if (strcmp(arg, "--abs-syms") == 0) {
++ show_absolute_syms = 1;
++ continue;
++ }
++ if (strcmp(arg, "--abs-relocs") == 0) {
++ show_absolute_relocs = 1;
++ continue;
++ }
++ if (strcmp(arg, "--text") == 0) {
++ as_text = 1;
++ continue;
++ }
++ if (strcmp(arg, "--realmode") == 0) {
++ use_real_mode = 1;
++ continue;
++ }
++ }
++ else if (!fname) {
++ fname = arg;
++ continue;
++ }
++ usage();
++ }
++ if (!fname) {
++ usage();
++ }
++ regex_init(use_real_mode);
++ 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, use_real_mode);
++ return 0;
++}
+--- a/scripts/Makefile
++++ b/scripts/Makefile
+@@ -8,6 +8,8 @@
+ # conmakehash: Create arrays for initializing the kernel console tables
+ # docproc: Used in Documentation/DocBook
+
++HOST_EXTRACFLAGS += -I$(srctree)/tools/include
++
+ hostprogs-$(CONFIG_KALLSYMS) += kallsyms
+ hostprogs-$(CONFIG_LOGO) += pnmtologo
+ hostprogs-$(CONFIG_VT) += conmakehash
projects / thirdparty / kernel / stable-queue.git / commitdiff
