6 files changed, 1 insertions, 469 deletions
diff --git a/Documentation/Makefile b/Documentation/Makefile
index 8cd6d1aaabfa..085b917b4695 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -1,3 +1,3 @@
 subdir-y := accounting auxdisplay blackfin \
 	ia64 laptops mic misc-devices \
-	networking pcmcia timers vDSO watchdog
+	networking pcmcia timers watchdog
diff --git a/Documentation/vDSO/.gitignore b/Documentation/vDSO/.gitignore
deleted file mode 100644
index 133bf9ee986c..000000000000
--- a/Documentation/vDSO/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-vdso_test
-vdso_standalone_test_x86
diff --git a/Documentation/vDSO/Makefile b/Documentation/vDSO/Makefile
deleted file mode 100644
index b12e98770e1f..000000000000
--- a/Documentation/vDSO/Makefile
+++ /dev/null
@@ -1,17 +0,0 @@
-ifndef CROSS_COMPILE
-# vdso_test won't build for glibc < 2.16, so disable it
-# hostprogs-y := vdso_test
-hostprogs-$(CONFIG_X86) := vdso_standalone_test_x86
-vdso_standalone_test_x86-objs := vdso_standalone_test_x86.o parse_vdso.o
-vdso_test-objs := parse_vdso.o vdso_test.o
-
-# Tell kbuild to always build the programs
-always := $(hostprogs-y)
-
-HOSTCFLAGS := -I$(objtree)/usr/include -std=gnu99
-HOSTCFLAGS_vdso_standalone_test_x86.o := -fno-asynchronous-unwind-tables -fno-stack-protector
-HOSTLOADLIBES_vdso_standalone_test_x86 := -nostdlib
-ifeq ($(CONFIG_X86_32),y)
-HOSTLOADLIBES_vdso_standalone_test_x86 += -lgcc_s
-endif
-endif
diff --git a/Documentation/vDSO/parse_vdso.c b/Documentation/vDSO/parse_vdso.c
deleted file mode 100644
index 1dbb4b87268f..000000000000
--- a/Documentation/vDSO/parse_vdso.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/*
- * parse_vdso.c: Linux reference vDSO parser
- * Written by Andrew Lutomirski, 2011-2014.
- *
- * This code is meant to be linked in to various programs that run on Linux.
- * As such, it is available with as few restrictions as possible.  This file
- * is licensed under the Creative Commons Zero License, version 1.0,
- * available at http://creativecommons.org/publicdomain/zero/1.0/legalcode
- *
- * The vDSO is a regular ELF DSO that the kernel maps into user space when
- * it starts a program.  It works equally well in statically and dynamically
- * linked binaries.
- *
- * This code is tested on x86.  In principle it should work on any
- * architecture that has a vDSO.
- */
-
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <limits.h>
-#include <elf.h>
-
-/*
- * To use this vDSO parser, first call one of the vdso_init_* functions.
- * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR
- * to vdso_init_from_sysinfo_ehdr.  Otherwise pass auxv to vdso_init_from_auxv.
- * Then call vdso_sym for each symbol you want.  For example, to look up
- * gettimeofday on x86_64, use:
- *
- *     <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday");
- * or
- *     <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
- *
- * vdso_sym will return 0 if the symbol doesn't exist or if the init function
- * failed or was not called.  vdso_sym is a little slow, so its return value
- * should be cached.
- *
- * vdso_sym is threadsafe; the init functions are not.
- *
- * These are the prototypes:
- */
-extern void vdso_init_from_auxv(void *auxv);
-extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-extern void *vdso_sym(const char *version, const char *name);
-
-
-/* And here's the code. */
-#ifndef ELF_BITS
-# if ULONG_MAX > 0xffffffffUL
-#  define ELF_BITS 64
-# else
-#  define ELF_BITS 32
-# endif
-#endif
-
-#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)
-
-static struct vdso_info
-{
-	bool valid;
-
-	/* Load information */
-	uintptr_t load_addr;
-	uintptr_t load_offset;  /* load_addr - recorded vaddr */
-
-	/* Symbol table */
-	ELF(Sym) *symtab;
-	const char *symstrings;
-	ELF(Word) *bucket, *chain;
-	ELF(Word) nbucket, nchain;
-
-	/* Version table */
-	ELF(Versym) *versym;
-	ELF(Verdef) *verdef;
-} vdso_info;
-
-/* Straight from the ELF specification. */
-static unsigned long elf_hash(const unsigned char *name)
-{
-	unsigned long h = 0, g;
-	while (*name)
-	{
-		h = (h << 4) + *name++;
-		if (g = h & 0xf0000000)
-			h ^= g >> 24;
-		h &= ~g;
-	}
-	return h;
-}
-
-void vdso_init_from_sysinfo_ehdr(uintptr_t base)
-{
-	size_t i;
-	bool found_vaddr = false;
-
-	vdso_info.valid = false;
-
-	vdso_info.load_addr = base;
-
-	ELF(Ehdr) *hdr = (ELF(Ehdr)*)base;
-	if (hdr->e_ident[EI_CLASS] !=
-	    (ELF_BITS == 32 ? ELFCLASS32 : ELFCLASS64)) {
-		return;  /* Wrong ELF class -- check ELF_BITS */
-	}
-
-	ELF(Phdr) *pt = (ELF(Phdr)*)(vdso_info.load_addr + hdr->e_phoff);
-	ELF(Dyn) *dyn = 0;
-
-	/*
-	 * We need two things from the segment table: the load offset
-	 * and the dynamic table.
-	 */
-	for (i = 0; i < hdr->e_phnum; i++)
-	{
-		if (pt[i].p_type == PT_LOAD && !found_vaddr) {
-			found_vaddr = true;
-			vdso_info.load_offset =	base
-				+ (uintptr_t)pt[i].p_offset
-				- (uintptr_t)pt[i].p_vaddr;
-		} else if (pt[i].p_type == PT_DYNAMIC) {
-			dyn = (ELF(Dyn)*)(base + pt[i].p_offset);
-		}
-	}
-
-	if (!found_vaddr || !dyn)
-		return;  /* Failed */
-
-	/*
-	 * Fish out the useful bits of the dynamic table.
-	 */
-	ELF(Word) *hash = 0;
-	vdso_info.symstrings = 0;
-	vdso_info.symtab = 0;
-	vdso_info.versym = 0;
-	vdso_info.verdef = 0;
-	for (i = 0; dyn[i].d_tag != DT_NULL; i++) {
-		switch (dyn[i].d_tag) {
-		case DT_STRTAB:
-			vdso_info.symstrings = (const char *)
-				((uintptr_t)dyn[i].d_un.d_ptr
-				 + vdso_info.load_offset);
-			break;
-		case DT_SYMTAB:
-			vdso_info.symtab = (ELF(Sym) *)
-				((uintptr_t)dyn[i].d_un.d_ptr
-				 + vdso_info.load_offset);
-			break;
-		case DT_HASH:
-			hash = (ELF(Word) *)
-				((uintptr_t)dyn[i].d_un.d_ptr
-				 + vdso_info.load_offset);
-			break;
-		case DT_VERSYM:
-			vdso_info.versym = (ELF(Versym) *)
-				((uintptr_t)dyn[i].d_un.d_ptr
-				 + vdso_info.load_offset);
-			break;
-		case DT_VERDEF:
-			vdso_info.verdef = (ELF(Verdef) *)
-				((uintptr_t)dyn[i].d_un.d_ptr
-				 + vdso_info.load_offset);
-			break;
-		}
-	}
-	if (!vdso_info.symstrings || !vdso_info.symtab || !hash)
-		return;  /* Failed */
-
-	if (!vdso_info.verdef)
-		vdso_info.versym = 0;
-
-	/* Parse the hash table header. */
-	vdso_info.nbucket = hash[0];
-	vdso_info.nchain = hash[1];
-	vdso_info.bucket = &hash[2];
-	vdso_info.chain = &hash[vdso_info.nbucket + 2];
-
-	/* That's all we need. */
-	vdso_info.valid = true;
-}
-
-static bool vdso_match_version(ELF(Versym) ver,
-			       const char *name, ELF(Word) hash)
-{
-	/*
-	 * This is a helper function to check if the version indexed by
-	 * ver matches name (which hashes to hash).
-	 *
-	 * The version definition table is a mess, and I don't know how
-	 * to do this in better than linear time without allocating memory
-	 * to build an index.  I also don't know why the table has
-	 * variable size entries in the first place.
-	 *
-	 * For added fun, I can't find a comprehensible specification of how
-	 * to parse all the weird flags in the table.
-	 *
-	 * So I just parse the whole table every time.
-	 */
-
-	/* First step: find the version definition */
-	ver &= 0x7fff;  /* Apparently bit 15 means "hidden" */
-	ELF(Verdef) *def = vdso_info.verdef;
-	while(true) {
-		if ((def->vd_flags & VER_FLG_BASE) == 0
-		    && (def->vd_ndx & 0x7fff) == ver)
-			break;
-
-		if (def->vd_next == 0)
-			return false;  /* No definition. */
-
-		def = (ELF(Verdef) *)((char *)def + def->vd_next);
-	}
-
-	/* Now figure out whether it matches. */
-	ELF(Verdaux) *aux = (ELF(Verdaux)*)((char *)def + def->vd_aux);
-	return def->vd_hash == hash
-		&& !strcmp(name, vdso_info.symstrings + aux->vda_name);
-}
-
-void *vdso_sym(const char *version, const char *name)
-{
-	unsigned long ver_hash;
-	if (!vdso_info.valid)
-		return 0;
-
-	ver_hash = elf_hash(version);
-	ELF(Word) chain = vdso_info.bucket[elf_hash(name) % vdso_info.nbucket];
-
-	for (; chain != STN_UNDEF; chain = vdso_info.chain[chain]) {
-		ELF(Sym) *sym = &vdso_info.symtab[chain];
-
-		/* Check for a defined global or weak function w/ right name. */
-		if (ELF64_ST_TYPE(sym->st_info) != STT_FUNC)
-			continue;
-		if (ELF64_ST_BIND(sym->st_info) != STB_GLOBAL &&
-		    ELF64_ST_BIND(sym->st_info) != STB_WEAK)
-			continue;
-		if (sym->st_shndx == SHN_UNDEF)
-			continue;
-		if (strcmp(name, vdso_info.symstrings + sym->st_name))
-			continue;
-
-		/* Check symbol version. */
-		if (vdso_info.versym
-		    && !vdso_match_version(vdso_info.versym[chain],
-					   version, ver_hash))
-			continue;
-
-		return (void *)(vdso_info.load_offset + sym->st_value);
-	}
-
-	return 0;
-}
-
-void vdso_init_from_auxv(void *auxv)
-{
-	ELF(auxv_t) *elf_auxv = auxv;
-	for (int i = 0; elf_auxv[i].a_type != AT_NULL; i++)
-	{
-		if (elf_auxv[i].a_type == AT_SYSINFO_EHDR) {
-			vdso_init_from_sysinfo_ehdr(elf_auxv[i].a_un.a_val);
-			return;
-		}
-	}
-
-	vdso_info.valid = false;
-}
diff --git a/Documentation/vDSO/vdso_standalone_test_x86.c b/Documentation/vDSO/vdso_standalone_test_x86.c
deleted file mode 100644
index 93b0ebf8cc38..000000000000
--- a/Documentation/vDSO/vdso_standalone_test_x86.c
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * vdso_test.c: Sample code to test parse_vdso.c on x86
- * Copyright (c) 2011-2014 Andy Lutomirski
- * Subject to the GNU General Public License, version 2
- *
- * You can amuse yourself by compiling with:
- * gcc -std=gnu99 -nostdlib
- *     -Os -fno-asynchronous-unwind-tables -flto -lgcc_s
- *      vdso_standalone_test_x86.c parse_vdso.c
- * to generate a small binary.  On x86_64, you can omit -lgcc_s
- * if you want the binary to be completely standalone.
- */
-
-#include <sys/syscall.h>
-#include <sys/time.h>
-#include <unistd.h>
-#include <stdint.h>
-
-extern void *vdso_sym(const char *version, const char *name);
-extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-extern void vdso_init_from_auxv(void *auxv);
-
-/* We need a libc functions... */
-int strcmp(const char *a, const char *b)
-{
-	/* This implementation is buggy: it never returns -1. */
-	while (*a || *b) {
-		if (*a != *b)
-			return 1;
-		if (*a == 0 || *b == 0)
-			return 1;
-		a++;
-		b++;
-	}
-
-	return 0;
-}
-
-/* ...and two syscalls.  This is x86-specific. */
-static inline long x86_syscall3(long nr, long a0, long a1, long a2)
-{
-	long ret;
-#ifdef __x86_64__
-	asm volatile ("syscall" : "=a" (ret) : "a" (nr),
-		      "D" (a0), "S" (a1), "d" (a2) :
-		      "cc", "memory", "rcx",
-		      "r8", "r9", "r10", "r11" );
-#else
-	asm volatile ("int $0x80" : "=a" (ret) : "a" (nr),
-		      "b" (a0), "c" (a1), "d" (a2) :
-		      "cc", "memory" );
-#endif
-	return ret;
-}
-
-static inline long linux_write(int fd, const void *data, size_t len)
-{
-	return x86_syscall3(__NR_write, fd, (long)data, (long)len);
-}
-
-static inline void linux_exit(int code)
-{
-	x86_syscall3(__NR_exit, code, 0, 0);
-}
-
-void to_base10(char *lastdig, time_t n)
-{
-	while (n) {
-		*lastdig = (n % 10) + '0';
-		n /= 10;
-		lastdig--;
-	}
-}
-
-__attribute__((externally_visible)) void c_main(void **stack)
-{
-	/* Parse the stack */
-	long argc = (long)*stack;
-	stack += argc + 2;
-
-	/* Now we're pointing at the environment.  Skip it. */
-	while(*stack)
-		stack++;
-	stack++;
-
-	/* Now we're pointing at auxv.  Initialize the vDSO parser. */
-	vdso_init_from_auxv((void *)stack);
-
-	/* Find gettimeofday. */
-	typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);
-	gtod_t gtod = (gtod_t)vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
-
-	if (!gtod)
-		linux_exit(1);
-
-	struct timeval tv;
-	long ret = gtod(&tv, 0);
-
-	if (ret == 0) {
-		char buf[] = "The time is                     .000000\n";
-		to_base10(buf + 31, tv.tv_sec);
-		to_base10(buf + 38, tv.tv_usec);
-		linux_write(1, buf, sizeof(buf) - 1);
-	} else {
-		linux_exit(ret);
-	}
-
-	linux_exit(0);
-}
-
-/*
- * This is the real entry point.  It passes the initial stack into
- * the C entry point.
- */
-asm (
-	".text\n"
-	".global _start\n"
-	".type _start,@function\n"
-	"_start:\n\t"
-#ifdef __x86_64__
-	"mov %rsp,%rdi\n\t"
-	"jmp c_main"
-#else
-	"push %esp\n\t"
-	"call c_main\n\t"
-	"int $3"
-#endif
-	);
diff --git a/Documentation/vDSO/vdso_test.c b/Documentation/vDSO/vdso_test.c
deleted file mode 100644
index 8daeb7d7032c..000000000000
--- a/Documentation/vDSO/vdso_test.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * vdso_test.c: Sample code to test parse_vdso.c
- * Copyright (c) 2014 Andy Lutomirski
- * Subject to the GNU General Public License, version 2
- *
- * Compile with:
- * gcc -std=gnu99 vdso_test.c parse_vdso.c
- *
- * Tested on x86, 32-bit and 64-bit.  It may work on other architectures, too.
- */
-
-#include <stdint.h>
-#include <elf.h>
-#include <stdio.h>
-#include <sys/auxv.h>
-#include <sys/time.h>
-
-extern void *vdso_sym(const char *version, const char *name);
-extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-extern void vdso_init_from_auxv(void *auxv);
-
-int main(int argc, char **argv)
-{
-	unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
-	if (!sysinfo_ehdr) {
-		printf("AT_SYSINFO_EHDR is not present!\n");
-		return 0;
-	}
-
-	vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
-
-	/* Find gettimeofday. */
-	typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);
-	gtod_t gtod = (gtod_t)vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
-
-	if (!gtod) {
-		printf("Could not find __vdso_gettimeofday\n");
-		return 1;
-	}
-
-	struct timeval tv;
-	long ret = gtod(&tv, 0);
-
-	if (ret == 0) {
-		printf("The time is %lld.%06lld\n",
-		       (long long)tv.tv_sec, (long long)tv.tv_usec);
-	} else {
-		printf("__vdso_gettimeofday failed\n");
-	}
-
-	return 0;
-}