[mirror_ubuntu-artful-kernel.git] / arch / x86 / boot / compressed / relocs.c

#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;

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++) {
			put_unaligned_le32(relocs[i], buf);
			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;
}
Commit	Line	Data
968de4f0 EB	1	#include <stdio.h>
	2	#include <stdarg.h>
	3	#include <stdlib.h>
	4	#include <stdint.h>
	5	#include <string.h>
	6	#include <errno.h>
	7	#include <unistd.h>
	8	#include <elf.h>
	9	#include <byteswap.h>
	10	#define USE_BSD
	11	#include <endian.h>
873b5271	12	#include <regex.h>
55f9709c	13	#include <tools/le_byteshift.h>
873b5271 PA	14
873b5271 PA	15	static void die(char *fmt, ...);
968de4f0	16
ca820181	17	#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
968de4f0	18	static Elf32_Ehdr ehdr;
968de4f0 EB	19	static unsigned long reloc_count, reloc_idx;
	20	static unsigned long *relocs;
	21
908ec7af PA	22	struct section {
	23	Elf32_Shdr shdr;
	24	struct section *link;
	25	Elf32_Sym *symtab;
	26	Elf32_Rel *reltab;
	27	char *strtab;
	28	};
	29	static struct section *secs;
	30
6a044b3a VG	31	/*
	32	* Following symbols have been audited. There values are constant and do
	33	* not change if bzImage is loaded at a different physical address than
	34	* the address for which it has been compiled. Don't warn user about
	35	* absolute relocations present w.r.t these symbols.
	36	*/
873b5271 PA	37	static const char abs_sym_regex[] =
	38	"^(xen_irq_disable_direct_reloc$\|"
	39	"xen_save_fl_direct_reloc$\|"
	40	"VDSO\|"
	41	"__crc_)";
	42	static regex_t abs_sym_regex_c;
	43	static int is_abs_reloc(const char *sym_name)
	44	{
	45	return !regexec(&abs_sym_regex_c, sym_name, 0, NULL, 0);
	46	}
6a044b3a	47
873b5271 PA	48	/*
	49	* These symbols are known to be relative, even if the linker marks them
	50	* as absolute (typically defined outside any section in the linker script.)
	51	*/
	52	static const char rel_sym_regex[] =
	53	"^_end$";
	54	static regex_t rel_sym_regex_c;
	55	static int is_rel_reloc(const char *sym_name)
6a044b3a	56	{
873b5271 PA	57	return !regexec(&rel_sym_regex_c, sym_name, 0, NULL, 0);
873b5271 PA	58	}
6a044b3a	59
873b5271 PA	60	static void regex_init(void)
	61	{
	62	char errbuf[128];
	63	int err;
	64
	65	err = regcomp(&abs_sym_regex_c, abs_sym_regex,
	66	REG_EXTENDED\|REG_NOSUB);
	67	if (err) {
	68	regerror(err, &abs_sym_regex_c, errbuf, sizeof errbuf);
	69	die("%s", errbuf);
	70	}
	71
	72	err = regcomp(&rel_sym_regex_c, rel_sym_regex,
	73	REG_EXTENDED\|REG_NOSUB);
	74	if (err) {
	75	regerror(err, &rel_sym_regex_c, errbuf, sizeof errbuf);
	76	die("%s", errbuf);
	77	}
6a044b3a VG	78	}
6a044b3a VG	79
968de4f0 EB	80	static void die(char *fmt, ...)
	81	{
	82	va_list ap;
	83	va_start(ap, fmt);
	84	vfprintf(stderr, fmt, ap);
	85	va_end(ap);
	86	exit(1);
	87	}
	88
	89	static const char *sym_type(unsigned type)
	90	{
	91	static const char *type_name[] = {
	92	#define SYM_TYPE(X) [X] = #X
	93	SYM_TYPE(STT_NOTYPE),
	94	SYM_TYPE(STT_OBJECT),
	95	SYM_TYPE(STT_FUNC),
	96	SYM_TYPE(STT_SECTION),
	97	SYM_TYPE(STT_FILE),
	98	SYM_TYPE(STT_COMMON),
	99	SYM_TYPE(STT_TLS),
	100	#undef SYM_TYPE
	101	};
	102	const char *name = "unknown sym type name";
ca820181	103	if (type < ARRAY_SIZE(type_name)) {
968de4f0 EB	104	name = type_name[type];
	105	}
	106	return name;
	107	}
	108
	109	static const char *sym_bind(unsigned bind)
	110	{
	111	static const char *bind_name[] = {
	112	#define SYM_BIND(X) [X] = #X
	113	SYM_BIND(STB_LOCAL),
	114	SYM_BIND(STB_GLOBAL),
	115	SYM_BIND(STB_WEAK),
	116	#undef SYM_BIND
	117	};
	118	const char *name = "unknown sym bind name";
ca820181	119	if (bind < ARRAY_SIZE(bind_name)) {
968de4f0 EB	120	name = bind_name[bind];
	121	}
	122	return name;
	123	}
	124
	125	static const char *sym_visibility(unsigned visibility)
	126	{
	127	static const char *visibility_name[] = {
	128	#define SYM_VISIBILITY(X) [X] = #X
	129	SYM_VISIBILITY(STV_DEFAULT),
	130	SYM_VISIBILITY(STV_INTERNAL),
	131	SYM_VISIBILITY(STV_HIDDEN),
	132	SYM_VISIBILITY(STV_PROTECTED),
	133	#undef SYM_VISIBILITY
	134	};
	135	const char *name = "unknown sym visibility name";
ca820181	136	if (visibility < ARRAY_SIZE(visibility_name)) {
968de4f0 EB	137	name = visibility_name[visibility];
	138	}
	139	return name;
	140	}
	141
	142	static const char *rel_type(unsigned type)
	143	{
	144	static const char *type_name[] = {
	145	#define REL_TYPE(X) [X] = #X
	146	REL_TYPE(R_386_NONE),
	147	REL_TYPE(R_386_32),
	148	REL_TYPE(R_386_PC32),
	149	REL_TYPE(R_386_GOT32),
	150	REL_TYPE(R_386_PLT32),
	151	REL_TYPE(R_386_COPY),
	152	REL_TYPE(R_386_GLOB_DAT),
	153	REL_TYPE(R_386_JMP_SLOT),
	154	REL_TYPE(R_386_RELATIVE),
	155	REL_TYPE(R_386_GOTOFF),
	156	REL_TYPE(R_386_GOTPC),
	157	#undef REL_TYPE
	158	};
	159	const char *name = "unknown type rel type name";
873b5271	160	if (type < ARRAY_SIZE(type_name) && type_name[type]) {
968de4f0 EB	161	name = type_name[type];
	162	}
	163	return name;
	164	}
	165
	166	static const char *sec_name(unsigned shndx)
	167	{
	168	const char *sec_strtab;
	169	const char *name;
908ec7af	170	sec_strtab = secs[ehdr.e_shstrndx].strtab;
968de4f0 EB	171	name = "<noname>";
968de4f0 EB	172	if (shndx < ehdr.e_shnum) {
908ec7af	173	name = sec_strtab + secs[shndx].shdr.sh_name;
968de4f0 EB	174	}
	175	else if (shndx == SHN_ABS) {
	176	name = "ABSOLUTE";
	177	}
	178	else if (shndx == SHN_COMMON) {
	179	name = "COMMON";
	180	}
	181	return name;
	182	}
	183
	184	static const char sym_name(const char sym_strtab, Elf32_Sym *sym)
	185	{
	186	const char *name;
	187	name = "<noname>";
	188	if (sym->st_name) {
	189	name = sym_strtab + sym->st_name;
	190	}
	191	else {
908ec7af	192	name = sec_name(secs[sym->st_shndx].shdr.sh_name);
968de4f0 EB	193	}
	194	return name;
	195	}
	196
	197
	198
13da9e20	199	#if BYTE_ORDER == LITTLE_ENDIAN
968de4f0 EB	200	#define le16_to_cpu(val) (val)
	201	#define le32_to_cpu(val) (val)
	202	#endif
13da9e20	203	#if BYTE_ORDER == BIG_ENDIAN
968de4f0 EB	204	#define le16_to_cpu(val) bswap_16(val)
	205	#define le32_to_cpu(val) bswap_32(val)
	206	#endif
	207
	208	static uint16_t elf16_to_cpu(uint16_t val)
	209	{
	210	return le16_to_cpu(val);
	211	}
	212
	213	static uint32_t elf32_to_cpu(uint32_t val)
	214	{
	215	return le32_to_cpu(val);
	216	}
	217
	218	static void read_ehdr(FILE *fp)
	219	{
	220	if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
	221	die("Cannot read ELF header: %s\n",
	222	strerror(errno));
	223	}
8bd1796d	224	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) {
968de4f0 EB	225	die("No ELF magic\n");
	226	}
	227	if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) {
	228	die("Not a 32 bit executable\n");
	229	}
	230	if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
	231	die("Not a LSB ELF executable\n");
	232	}
	233	if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
	234	die("Unknown ELF version\n");
	235	}
	236	/* Convert the fields to native endian */
	237	ehdr.e_type = elf16_to_cpu(ehdr.e_type);
	238	ehdr.e_machine = elf16_to_cpu(ehdr.e_machine);
	239	ehdr.e_version = elf32_to_cpu(ehdr.e_version);
	240	ehdr.e_entry = elf32_to_cpu(ehdr.e_entry);
	241	ehdr.e_phoff = elf32_to_cpu(ehdr.e_phoff);
	242	ehdr.e_shoff = elf32_to_cpu(ehdr.e_shoff);
	243	ehdr.e_flags = elf32_to_cpu(ehdr.e_flags);
	244	ehdr.e_ehsize = elf16_to_cpu(ehdr.e_ehsize);
	245	ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize);
	246	ehdr.e_phnum = elf16_to_cpu(ehdr.e_phnum);
	247	ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize);
	248	ehdr.e_shnum = elf16_to_cpu(ehdr.e_shnum);
	249	ehdr.e_shstrndx = elf16_to_cpu(ehdr.e_shstrndx);
	250
	251	if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
	252	die("Unsupported ELF header type\n");
	253	}
	254	if (ehdr.e_machine != EM_386) {
	255	die("Not for x86\n");
	256	}
	257	if (ehdr.e_version != EV_CURRENT) {
	258	die("Unknown ELF version\n");
	259	}
	260	if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) {
	261	die("Bad Elf header size\n");
	262	}
	263	if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) {
	264	die("Bad program header entry\n");
	265	}
	266	if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) {
	267	die("Bad section header entry\n");
	268	}
	269	if (ehdr.e_shstrndx >= ehdr.e_shnum) {
	270	die("String table index out of bounds\n");
	271	}
	272	}
	273
	274	static void read_shdrs(FILE *fp)
	275	{
	276	int i;
908ec7af PA	277	Elf32_Shdr shdr;
	278
	279	secs = calloc(ehdr.e_shnum, sizeof(struct section));
	280	if (!secs) {
	281	die("Unable to allocate %d section headers\n",
	282	ehdr.e_shnum);
968de4f0 EB	283	}
	284	if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
	285	die("Seek to %d failed: %s\n",
	286	ehdr.e_shoff, strerror(errno));
	287	}
908ec7af PA	288	for (i = 0; i < ehdr.e_shnum; i++) {
	289	struct section *sec = &secs[i];
	290	if (fread(&shdr, sizeof shdr, 1, fp) != 1)
	291	die("Cannot read ELF section headers %d/%d: %s\n",
	292	i, ehdr.e_shnum, strerror(errno));
	293	sec->shdr.sh_name = elf32_to_cpu(shdr.sh_name);
	294	sec->shdr.sh_type = elf32_to_cpu(shdr.sh_type);
	295	sec->shdr.sh_flags = elf32_to_cpu(shdr.sh_flags);
	296	sec->shdr.sh_addr = elf32_to_cpu(shdr.sh_addr);
	297	sec->shdr.sh_offset = elf32_to_cpu(shdr.sh_offset);
	298	sec->shdr.sh_size = elf32_to_cpu(shdr.sh_size);
	299	sec->shdr.sh_link = elf32_to_cpu(shdr.sh_link);
	300	sec->shdr.sh_info = elf32_to_cpu(shdr.sh_info);
	301	sec->shdr.sh_addralign = elf32_to_cpu(shdr.sh_addralign);
	302	sec->shdr.sh_entsize = elf32_to_cpu(shdr.sh_entsize);
	303	if (sec->shdr.sh_link < ehdr.e_shnum)
	304	sec->link = &secs[sec->shdr.sh_link];
968de4f0 EB	305	}
	306
	307	}
	308
	309	static void read_strtabs(FILE *fp)
	310	{
	311	int i;
908ec7af PA	312	for (i = 0; i < ehdr.e_shnum; i++) {
	313	struct section *sec = &secs[i];
	314	if (sec->shdr.sh_type != SHT_STRTAB) {
968de4f0 EB	315	continue;
968de4f0 EB	316	}
908ec7af PA	317	sec->strtab = malloc(sec->shdr.sh_size);
908ec7af PA	318	if (!sec->strtab) {
968de4f0	319	die("malloc of %d bytes for strtab failed\n",
908ec7af	320	sec->shdr.sh_size);
968de4f0	321	}
908ec7af	322	if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
968de4f0	323	die("Seek to %d failed: %s\n",
908ec7af	324	sec->shdr.sh_offset, strerror(errno));
968de4f0	325	}
908ec7af PA	326	if (fread(sec->strtab, 1, sec->shdr.sh_size, fp)
908ec7af PA	327	!= sec->shdr.sh_size) {
968de4f0 EB	328	die("Cannot read symbol table: %s\n",
	329	strerror(errno));
	330	}
	331	}
	332	}
	333
	334	static void read_symtabs(FILE *fp)
	335	{
	336	int i,j;
908ec7af PA	337	for (i = 0; i < ehdr.e_shnum; i++) {
	338	struct section *sec = &secs[i];
	339	if (sec->shdr.sh_type != SHT_SYMTAB) {
968de4f0 EB	340	continue;
968de4f0 EB	341	}
908ec7af PA	342	sec->symtab = malloc(sec->shdr.sh_size);
908ec7af PA	343	if (!sec->symtab) {
968de4f0	344	die("malloc of %d bytes for symtab failed\n",
908ec7af	345	sec->shdr.sh_size);
968de4f0	346	}
908ec7af	347	if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
968de4f0	348	die("Seek to %d failed: %s\n",
908ec7af	349	sec->shdr.sh_offset, strerror(errno));
968de4f0	350	}
908ec7af PA	351	if (fread(sec->symtab, 1, sec->shdr.sh_size, fp)
908ec7af PA	352	!= sec->shdr.sh_size) {
968de4f0 EB	353	die("Cannot read symbol table: %s\n",
	354	strerror(errno));
	355	}
908ec7af PA	356	for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Sym); j++) {
	357	Elf32_Sym *sym = &sec->symtab[j];
	358	sym->st_name = elf32_to_cpu(sym->st_name);
	359	sym->st_value = elf32_to_cpu(sym->st_value);
	360	sym->st_size = elf32_to_cpu(sym->st_size);
	361	sym->st_shndx = elf16_to_cpu(sym->st_shndx);
968de4f0 EB	362	}
	363	}
	364	}
	365
	366
	367	static void read_relocs(FILE *fp)
	368	{
	369	int i,j;
908ec7af PA	370	for (i = 0; i < ehdr.e_shnum; i++) {
	371	struct section *sec = &secs[i];
	372	if (sec->shdr.sh_type != SHT_REL) {
968de4f0 EB	373	continue;
968de4f0 EB	374	}
908ec7af PA	375	sec->reltab = malloc(sec->shdr.sh_size);
908ec7af PA	376	if (!sec->reltab) {
968de4f0	377	die("malloc of %d bytes for relocs failed\n",
908ec7af	378	sec->shdr.sh_size);
968de4f0	379	}
908ec7af	380	if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
968de4f0	381	die("Seek to %d failed: %s\n",
908ec7af	382	sec->shdr.sh_offset, strerror(errno));
968de4f0	383	}
908ec7af PA	384	if (fread(sec->reltab, 1, sec->shdr.sh_size, fp)
908ec7af PA	385	!= sec->shdr.sh_size) {
968de4f0 EB	386	die("Cannot read symbol table: %s\n",
	387	strerror(errno));
	388	}
908ec7af PA	389	for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
	390	Elf32_Rel *rel = &sec->reltab[j];
	391	rel->r_offset = elf32_to_cpu(rel->r_offset);
	392	rel->r_info = elf32_to_cpu(rel->r_info);
968de4f0 EB	393	}
	394	}
	395	}
	396
	397
	398	static void print_absolute_symbols(void)
	399	{
	400	int i;
	401	printf("Absolute symbols\n");
	402	printf(" Num: Value Size Type Bind Visibility Name\n");
908ec7af PA	403	for (i = 0; i < ehdr.e_shnum; i++) {
908ec7af PA	404	struct section *sec = &secs[i];
968de4f0	405	char *sym_strtab;
968de4f0	406	int j;
908ec7af PA	407
908ec7af PA	408	if (sec->shdr.sh_type != SHT_SYMTAB) {
968de4f0 EB	409	continue;
968de4f0 EB	410	}
908ec7af PA	411	sym_strtab = sec->link->strtab;
908ec7af PA	412	for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Sym); j++) {
968de4f0 EB	413	Elf32_Sym *sym;
968de4f0 EB	414	const char *name;
908ec7af	415	sym = &sec->symtab[j];
968de4f0 EB	416	name = sym_name(sym_strtab, sym);
	417	if (sym->st_shndx != SHN_ABS) {
	418	continue;
	419	}
	420	printf("%5d %08x %5d %10s %10s %12s %s\n",
	421	j, sym->st_value, sym->st_size,
	422	sym_type(ELF32_ST_TYPE(sym->st_info)),
	423	sym_bind(ELF32_ST_BIND(sym->st_info)),
	424	sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)),
	425	name);
	426	}
	427	}
	428	printf("\n");
	429	}
	430
	431	static void print_absolute_relocs(void)
	432	{
6a044b3a VG	433	int i, printed = 0;
6a044b3a VG	434
908ec7af PA	435	for (i = 0; i < ehdr.e_shnum; i++) {
	436	struct section *sec = &secs[i];
	437	struct section sec_applies, sec_symtab;
968de4f0 EB	438	char *sym_strtab;
968de4f0 EB	439	Elf32_Sym *sh_symtab;
968de4f0	440	int j;
908ec7af	441	if (sec->shdr.sh_type != SHT_REL) {
968de4f0 EB	442	continue;
968de4f0 EB	443	}
908ec7af PA	444	sec_symtab = sec->link;
	445	sec_applies = &secs[sec->shdr.sh_info];
	446	if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
968de4f0 EB	447	continue;
968de4f0 EB	448	}
908ec7af PA	449	sh_symtab = sec_symtab->symtab;
	450	sym_strtab = sec_symtab->link->strtab;
	451	for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
968de4f0 EB	452	Elf32_Rel *rel;
	453	Elf32_Sym *sym;
	454	const char *name;
908ec7af	455	rel = &sec->reltab[j];
968de4f0 EB	456	sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
	457	name = sym_name(sym_strtab, sym);
	458	if (sym->st_shndx != SHN_ABS) {
	459	continue;
	460	}
6a044b3a VG	461
	462	/* Absolute symbols are not relocated if bzImage is
	463	* loaded at a non-compiled address. Display a warning
	464	* to user at compile time about the absolute
	465	* relocations present.
	466	*
	467	* User need to audit the code to make sure
	468	* some symbols which should have been section
	469	* relative have not become absolute because of some
	470	* linker optimization or wrong programming usage.
	471	*
	472	* Before warning check if this absolute symbol
	473	* relocation is harmless.
	474	*/
873b5271	475	if (is_abs_reloc(name) \|\| is_rel_reloc(name))
6a044b3a VG	476	continue;
	477
	478	if (!printed) {
	479	printf("WARNING: Absolute relocations"
	480	" present\n");
	481	printf("Offset Info Type Sym.Value "
	482	"Sym.Name\n");
	483	printed = 1;
	484	}
	485
968de4f0 EB	486	printf("%08x %08x %10s %08x %s\n",
	487	rel->r_offset,
	488	rel->r_info,
	489	rel_type(ELF32_R_TYPE(rel->r_info)),
	490	sym->st_value,
	491	name);
	492	}
	493	}
6a044b3a VG	494
	495	if (printed)
	496	printf("\n");
968de4f0 EB	497	}
	498
	499	static void walk_relocs(void (visit)(Elf32_Rel rel, Elf32_Sym *sym))
	500	{
	501	int i;
	502	/* Walk through the relocations */
908ec7af	503	for (i = 0; i < ehdr.e_shnum; i++) {
968de4f0 EB	504	char *sym_strtab;
968de4f0 EB	505	Elf32_Sym *sh_symtab;
908ec7af	506	struct section sec_applies, sec_symtab;
968de4f0	507	int j;
908ec7af PA	508	struct section *sec = &secs[i];
	509
	510	if (sec->shdr.sh_type != SHT_REL) {
968de4f0 EB	511	continue;
968de4f0 EB	512	}
908ec7af PA	513	sec_symtab = sec->link;
	514	sec_applies = &secs[sec->shdr.sh_info];
	515	if (!(sec_applies->shdr.sh_flags & SHF_ALLOC)) {
968de4f0 EB	516	continue;
968de4f0 EB	517	}
908ec7af	518	sh_symtab = sec_symtab->symtab;
cc65f1ec	519	sym_strtab = sec_symtab->link->strtab;
908ec7af	520	for (j = 0; j < sec->shdr.sh_size/sizeof(Elf32_Rel); j++) {
968de4f0 EB	521	Elf32_Rel *rel;
	522	Elf32_Sym *sym;
	523	unsigned r_type;
908ec7af	524	rel = &sec->reltab[j];
968de4f0 EB	525	sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
	526	r_type = ELF32_R_TYPE(rel->r_info);
	527	/* Don't visit relocations to absolute symbols */
873b5271 PA	528	if (sym->st_shndx == SHN_ABS &&
873b5271 PA	529	!is_rel_reloc(sym_name(sym_strtab, sym))) {
968de4f0 EB	530	continue;
968de4f0 EB	531	}
873b5271 PA	532	switch (r_type) {
	533	case R_386_NONE:
	534	case R_386_PC32:
46176b4f TH	535	/*
	536	* NONE can be ignored and and PC relative
	537	* relocations don't need to be adjusted.
	538	*/
873b5271 PA	539	break;
873b5271 PA	540	case R_386_32:
968de4f0 EB	541	/* Visit relocations that need to be adjusted */
968de4f0 EB	542	visit(rel, sym);
873b5271 PA	543	break;
	544	default:
	545	die("Unsupported relocation type: %s (%d)\n",
	546	rel_type(r_type), r_type);
	547	break;
968de4f0 EB	548	}
	549	}
	550	}
	551	}
	552
	553	static void count_reloc(Elf32_Rel rel, Elf32_Sym sym)
	554	{
	555	reloc_count += 1;
	556	}
	557
	558	static void collect_reloc(Elf32_Rel rel, Elf32_Sym sym)
	559	{
	560	/* Remember the address that needs to be adjusted. */
	561	relocs[reloc_idx++] = rel->r_offset;
	562	}
	563
	564	static int cmp_relocs(const void va, const void vb)
	565	{
	566	const unsigned long a, b;
	567	a = va; b = vb;
	568	return (a == b)? 0 : (a > b)? 1 : -1;
	569	}
	570
	571	static void emit_relocs(int as_text)
	572	{
	573	int i;
	574	/* Count how many relocations I have and allocate space for them. */
	575	reloc_count = 0;
	576	walk_relocs(count_reloc);
	577	relocs = malloc(reloc_count * sizeof(relocs[0]));
	578	if (!relocs) {
	579	die("malloc of %d entries for relocs failed\n",
	580	reloc_count);
	581	}
	582	/* Collect up the relocations */
	583	reloc_idx = 0;
	584	walk_relocs(collect_reloc);
	585
	586	/* Order the relocations for more efficient processing */
	587	qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs);
	588
	589	/* Print the relocations */
	590	if (as_text) {
	591	/* Print the relocations in a form suitable that
	592	* gas will like.
	593	*/
	594	printf(".section \".data.reloc\",\"a\"\n");
	595	printf(".balign 4\n");
908ec7af	596	for (i = 0; i < reloc_count; i++) {
968de4f0 EB	597	printf("\t .long 0x%08lx\n", relocs[i]);
	598	}
	599	printf("\n");
	600	}
	601	else {
	602	unsigned char buf[4];
968de4f0	603	/* Print a stop */
873b5271	604	fwrite("\0\0\0\0", 4, 1, stdout);
968de4f0	605	/* Now print each relocation */
908ec7af	606	for (i = 0; i < reloc_count; i++) {
55f9709c	607	put_unaligned_le32(relocs[i], buf);
873b5271	608	fwrite(buf, 4, 1, stdout);
968de4f0 EB	609	}
	610	}
	611	}
	612
	613	static void usage(void)
	614	{
6a044b3a	615	die("relocs [--abs-syms \|--abs-relocs \| --text] vmlinux\n");
968de4f0 EB	616	}
	617
	618	int main(int argc, char **argv)
	619	{
6a044b3a	620	int show_absolute_syms, show_absolute_relocs;
968de4f0 EB	621	int as_text;
	622	const char *fname;
	623	FILE *fp;
	624	int i;
	625
873b5271 PA	626	regex_init();
873b5271 PA	627
6a044b3a VG	628	show_absolute_syms = 0;
6a044b3a VG	629	show_absolute_relocs = 0;
968de4f0 EB	630	as_text = 0;
968de4f0 EB	631	fname = NULL;
908ec7af	632	for (i = 1; i < argc; i++) {
968de4f0 EB	633	char *arg = argv[i];
968de4f0 EB	634	if (*arg == '-') {
6a044b3a VG	635	if (strcmp(argv[1], "--abs-syms") == 0) {
	636	show_absolute_syms = 1;
	637	continue;
	638	}
	639
	640	if (strcmp(argv[1], "--abs-relocs") == 0) {
	641	show_absolute_relocs = 1;
968de4f0 EB	642	continue;
	643	}
	644	else if (strcmp(argv[1], "--text") == 0) {
	645	as_text = 1;
	646	continue;
	647	}
	648	}
	649	else if (!fname) {
	650	fname = arg;
	651	continue;
	652	}
	653	usage();
	654	}
	655	if (!fname) {
	656	usage();
	657	}
	658	fp = fopen(fname, "r");
	659	if (!fp) {
	660	die("Cannot open %s: %s\n",
	661	fname, strerror(errno));
	662	}
	663	read_ehdr(fp);
	664	read_shdrs(fp);
	665	read_strtabs(fp);
	666	read_symtabs(fp);
	667	read_relocs(fp);
6a044b3a	668	if (show_absolute_syms) {
968de4f0	669	print_absolute_symbols();
6a044b3a VG	670	return 0;
	671	}
	672	if (show_absolute_relocs) {
968de4f0 EB	673	print_absolute_relocs();
	674	return 0;
	675	}
	676	emit_relocs(as_text);
	677	return 0;
	678	}