1 files changed, 0 insertions, 253 deletions
diff --git a/arch/x86/vdso/vdso2c.c b/arch/x86/vdso/vdso2c.c
deleted file mode 100644
index 8627db24a7f6..000000000000
--- a/arch/x86/vdso/vdso2c.c
+++ /dev/null
@@ -1,253 +0,0 @@
-/*
- * vdso2c - A vdso image preparation tool
- * Copyright (c) 2014 Andy Lutomirski and others
- * Licensed under the GPL v2
- *
- * vdso2c requires stripped and unstripped input.  It would be trivial
- * to fully strip the input in here, but, for reasons described below,
- * we need to write a section table.  Doing this is more or less
- * equivalent to dropping all non-allocatable sections, but it's
- * easier to let objcopy handle that instead of doing it ourselves.
- * If we ever need to do something fancier than what objcopy provides,
- * it would be straightforward to add here.
- *
- * We're keep a section table for a few reasons:
- *
- * The Go runtime had a couple of bugs: it would read the section
- * table to try to figure out how many dynamic symbols there were (it
- * shouldn't have looked at the section table at all) and, if there
- * were no SHT_SYNDYM section table entry, it would use an
- * uninitialized value for the number of symbols.  An empty DYNSYM
- * table would work, but I see no reason not to write a valid one (and
- * keep full performance for old Go programs).  This hack is only
- * needed on x86_64.
- *
- * The bug was introduced on 2012-08-31 by:
- * https://code.google.com/p/go/source/detail?r=56ea40aac72b
- * and was fixed on 2014-06-13 by:
- * https://code.google.com/p/go/source/detail?r=fc1cd5e12595
- *
- * Binutils has issues debugging the vDSO: it reads the section table to
- * find SHT_NOTE; it won't look at PT_NOTE for the in-memory vDSO, which
- * would break build-id if we removed the section table.  Binutils
- * also requires that shstrndx != 0.  See:
- * https://sourceware.org/bugzilla/show_bug.cgi?id=17064
- *
- * elfutils might not look for PT_NOTE if there is a section table at
- * all.  I don't know whether this matters for any practical purpose.
- *
- * For simplicity, rather than hacking up a partial section table, we
- * just write a mostly complete one.  We omit non-dynamic symbols,
- * though, since they're rather large.
- *
- * Once binutils gets fixed, we might be able to drop this for all but
- * the 64-bit vdso, since build-id only works in kernel RPMs, and
- * systems that update to new enough kernel RPMs will likely update
- * binutils in sync.  build-id has never worked for home-built kernel
- * RPMs without manual symlinking, and I suspect that no one ever does
- * that.
- */
-
-#include <inttypes.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <fcntl.h>
-#include <err.h>
-
-#include <sys/mman.h>
-#include <sys/types.h>
-
-#include <tools/le_byteshift.h>
-
-#include <linux/elf.h>
-#include <linux/types.h>
-
-const char *outfilename;
-
-/* Symbols that we need in vdso2c. */
-enum {
-	sym_vvar_start,
-	sym_vvar_page,
-	sym_hpet_page,
-	sym_VDSO_FAKE_SECTION_TABLE_START,
-	sym_VDSO_FAKE_SECTION_TABLE_END,
-};
-
-const int special_pages[] = {
-	sym_vvar_page,
-	sym_hpet_page,
-};
-
-struct vdso_sym {
-	const char *name;
-	bool export;
-};
-
-struct vdso_sym required_syms[] = {
-	[sym_vvar_start] = {"vvar_start", true},
-	[sym_vvar_page] = {"vvar_page", true},
-	[sym_hpet_page] = {"hpet_page", true},
-	[sym_VDSO_FAKE_SECTION_TABLE_START] = {
-		"VDSO_FAKE_SECTION_TABLE_START", false
-	},
-	[sym_VDSO_FAKE_SECTION_TABLE_END] = {
-		"VDSO_FAKE_SECTION_TABLE_END", false
-	},
-	{"VDSO32_NOTE_MASK", true},
-	{"VDSO32_SYSENTER_RETURN", true},
-	{"__kernel_vsyscall", true},
-	{"__kernel_sigreturn", true},
-	{"__kernel_rt_sigreturn", true},
-};
-
-__attribute__((format(printf, 1, 2))) __attribute__((noreturn))
-static void fail(const char *format, ...)
-{
-	va_list ap;
-	va_start(ap, format);
-	fprintf(stderr, "Error: ");
-	vfprintf(stderr, format, ap);
-	if (outfilename)
-		unlink(outfilename);
-	exit(1);
-	va_end(ap);
-}
-
-/*
- * Evil macros for little-endian reads and writes
- */
-#define GLE(x, bits, ifnot)						\
-	__builtin_choose_expr(						\
-		(sizeof(*(x)) == bits/8),				\
-		(__typeof__(*(x)))get_unaligned_le##bits(x), ifnot)
-
-extern void bad_get_le(void);
-#define LAST_GLE(x)							\
-	__builtin_choose_expr(sizeof(*(x)) == 1, *(x), bad_get_le())
-
-#define GET_LE(x)							\
-	GLE(x, 64, GLE(x, 32, GLE(x, 16, LAST_GLE(x))))
-
-#define PLE(x, val, bits, ifnot)					\
-	__builtin_choose_expr(						\
-		(sizeof(*(x)) == bits/8),				\
-		put_unaligned_le##bits((val), (x)), ifnot)
-
-extern void bad_put_le(void);
-#define LAST_PLE(x, val)						\
-	__builtin_choose_expr(sizeof(*(x)) == 1, *(x) = (val), bad_put_le())
-
-#define PUT_LE(x, val)					\
-	PLE(x, val, 64, PLE(x, val, 32, PLE(x, val, 16, LAST_PLE(x, val))))
-
-
-#define NSYMS (sizeof(required_syms) / sizeof(required_syms[0]))
-
-#define BITSFUNC3(name, bits, suffix) name##bits##suffix
-#define BITSFUNC2(name, bits, suffix) BITSFUNC3(name, bits, suffix)
-#define BITSFUNC(name) BITSFUNC2(name, ELF_BITS, )
-
-#define INT_BITS BITSFUNC2(int, ELF_BITS, _t)
-
-#define ELF_BITS_XFORM2(bits, x) Elf##bits##_##x
-#define ELF_BITS_XFORM(bits, x) ELF_BITS_XFORM2(bits, x)
-#define ELF(x) ELF_BITS_XFORM(ELF_BITS, x)
-
-#define ELF_BITS 64
-#include "vdso2c.h"
-#undef ELF_BITS
-
-#define ELF_BITS 32
-#include "vdso2c.h"
-#undef ELF_BITS
-
-static void go(void *raw_addr, size_t raw_len,
-	       void *stripped_addr, size_t stripped_len,
-	       FILE *outfile, const char *name)
-{
-	Elf64_Ehdr *hdr = (Elf64_Ehdr *)raw_addr;
-
-	if (hdr->e_ident[EI_CLASS] == ELFCLASS64) {
-		go64(raw_addr, raw_len, stripped_addr, stripped_len,
-		     outfile, name);
-	} else if (hdr->e_ident[EI_CLASS] == ELFCLASS32) {
-		go32(raw_addr, raw_len, stripped_addr, stripped_len,
-		     outfile, name);
-	} else {
-		fail("unknown ELF class\n");
-	}
-}
-
-static void map_input(const char *name, void **addr, size_t *len, int prot)
-{
-	off_t tmp_len;
-
-	int fd = open(name, O_RDONLY);
-	if (fd == -1)
-		err(1, "%s", name);
-
-	tmp_len = lseek(fd, 0, SEEK_END);
-	if (tmp_len == (off_t)-1)
-		err(1, "lseek");
-	*len = (size_t)tmp_len;
-
-	*addr = mmap(NULL, tmp_len, prot, MAP_PRIVATE, fd, 0);
-	if (*addr == MAP_FAILED)
-		err(1, "mmap");
-
-	close(fd);
-}
-
-int main(int argc, char **argv)
-{
-	size_t raw_len, stripped_len;
-	void *raw_addr, *stripped_addr;
-	FILE *outfile;
-	char *name, *tmp;
-	int namelen;
-
-	if (argc != 4) {
-		printf("Usage: vdso2c RAW_INPUT STRIPPED_INPUT OUTPUT\n");
-		return 1;
-	}
-
-	/*
-	 * Figure out the struct name.  If we're writing to a .so file,
-	 * generate raw output insted.
-	 */
-	name = strdup(argv[3]);
-	namelen = strlen(name);
-	if (namelen >= 3 && !strcmp(name + namelen - 3, ".so")) {
-		name = NULL;
-	} else {
-		tmp = strrchr(name, '/');
-		if (tmp)
-			name = tmp + 1;
-		tmp = strchr(name, '.');
-		if (tmp)
-			*tmp = '\0';
-		for (tmp = name; *tmp; tmp++)
-			if (*tmp == '-')
-				*tmp = '_';
-	}
-
-	map_input(argv[1], &raw_addr, &raw_len, PROT_READ);
-	map_input(argv[2], &stripped_addr, &stripped_len, PROT_READ);
-
-	outfilename = argv[3];
-	outfile = fopen(outfilename, "w");
-	if (!outfile)
-		err(1, "%s", argv[2]);
-
-	go(raw_addr, raw_len, stripped_addr, stripped_len, outfile, name);
-
-	munmap(raw_addr, raw_len);
-	munmap(stripped_addr, stripped_len);
-	fclose(outfile);
-
-	return 0;
-}