---

yaml
---
r: 62360
b: refs/heads/master
c: 2aae950
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a586df067afe0580bb02b7a6312ca2afe49bba03
+refs/heads/master: 2aae950b21e4bc789d1fc6668faf67e8748300b7

trunk/Documentation/kernel-parameters.txt

@@ -1882,7 +1882,7 @@ and is between 256 and 4096 characters. It is defined in the file
 	usbhid.mousepoll=
 			[USBHID] The interval which mice are to be polled at.
 
-	vdso=		[IA-32,SH]
+	vdso=		[IA-32,SH,x86-64]
 			vdso=2: enable compat VDSO (default with COMPAT_VDSO)
 			vdso=1: enable VDSO (default)
 			vdso=0: disable VDSO mapping

trunk/arch/x86_64/Makefile

@@ -76,7 +76,8 @@ head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kern
 libs-y 					+= arch/x86_64/lib/
 core-y					+= arch/x86_64/kernel/ \
 					   arch/x86_64/mm/ \
-					   arch/x86_64/crypto/
+					   arch/x86_64/crypto/ \
+					   arch/x86_64/vdso/
 core-$(CONFIG_IA32_EMULATION)		+= arch/x86_64/ia32/
 drivers-$(CONFIG_PCI)			+= arch/x86_64/pci/
 drivers-$(CONFIG_OPROFILE)		+= arch/x86_64/oprofile/

trunk/arch/x86_64/ia32/ia32_binfmt.c

@@ -38,6 +38,7 @@
 
 int sysctl_vsyscall32 = 1;
 
+#undef ARCH_DLINFO
 #define ARCH_DLINFO do {  \
 	if (sysctl_vsyscall32) { \
 	NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \

trunk/arch/x86_64/kernel/time.c

@@ -44,6 +44,7 @@
 #include <asm/hpet.h>
 #include <asm/mpspec.h>
 #include <asm/nmi.h>
+#include <asm/vgtod.h>
 
 static char *timename = NULL;
 

trunk/arch/x86_64/kernel/vmlinux.lds.S

@@ -93,6 +93,9 @@ SECTIONS
   .vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data))
 		{ *(.vsyscall_gtod_data) }
   vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
+  .vsyscall_clock : AT(VLOAD(.vsyscall_clock))
+		{ *(.vsyscall_clock) }
+  vsyscall_clock = VVIRT(.vsyscall_clock);
 
 
   .vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1))
@@ -189,6 +192,12 @@ SECTIONS
   .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { *(.exit.text) }
   .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { *(.exit.data) }
 
+/* vdso blob that is mapped into user space */
+  vdso_start = . ;
+  .vdso  : AT(ADDR(.vdso) - LOAD_OFFSET) { *(.vdso) }
+  . = ALIGN(4096);
+  vdso_end = .;
+
 #ifdef CONFIG_BLK_DEV_INITRD
   . = ALIGN(4096);
   __initramfs_start = .;

trunk/arch/x86_64/kernel/vsyscall.c

@@ -42,6 +42,7 @@
 #include <asm/segment.h>
 #include <asm/desc.h>
 #include <asm/topology.h>
+#include <asm/vgtod.h>
 
 #define __vsyscall(nr) __attribute__ ((unused,__section__(".vsyscall_" #nr)))
 #define __syscall_clobber "r11","rcx","memory"
@@ -57,26 +58,9 @@
  * - writen by timer interrupt or systcl (/proc/sys/kernel/vsyscall64)
  * Try to keep this structure as small as possible to avoid cache line ping pongs
  */
-struct vsyscall_gtod_data_t {
-	seqlock_t	lock;
-
-	/* open coded 'struct timespec' */
-	time_t		wall_time_sec;
-	u32		wall_time_nsec;
-
-	int		sysctl_enabled;
-	struct timezone sys_tz;
-	struct { /* extract of a clocksource struct */
-		cycle_t (*vread)(void);
-		cycle_t	cycle_last;
-		cycle_t	mask;
-		u32	mult;
-		u32	shift;
-	} clock;
-};
 int __vgetcpu_mode __section_vgetcpu_mode;
 
-struct vsyscall_gtod_data_t __vsyscall_gtod_data __section_vsyscall_gtod_data =
+struct vsyscall_gtod_data __vsyscall_gtod_data __section_vsyscall_gtod_data =
 {
 	.lock = SEQLOCK_UNLOCKED,
 	.sysctl_enabled = 1,
@@ -96,6 +80,8 @@ void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
 	vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
 	vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
 	vsyscall_gtod_data.sys_tz = sys_tz;
+	vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;
+	vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
 	write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
 }
 

trunk/arch/x86_64/mm/init.c

@@ -774,3 +774,12 @@ void *alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size)
 	return __alloc_bootmem_core(pgdat->bdata, size,
 			SMP_CACHE_BYTES, (4UL*1024*1024*1024), 0);
 }
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+	if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
+		return "[vdso]";
+	if (vma == &gate_vma)
+		return "[vsyscall]";
+	return NULL;
+}

trunk/arch/x86_64/vdso/Makefile

@@ -0,0 +1,49 @@
+#
+# x86-64 vDSO.
+#
+
+# files to link into the vdso
+# vdso-start.o has to be first
+vobjs-y := vdso-start.o vdso-note.o vclock_gettime.o vgetcpu.o vvar.o
+
+# files to link into kernel
+obj-y := vma.o vdso.o vdso-syms.o
+
+vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
+
+$(obj)/vdso.o: $(obj)/vdso.so
+
+targets += vdso.so vdso.lds $(vobjs-y) vdso-syms.o
+
+# The DSO images are built using a special linker script.
+quiet_cmd_syscall = SYSCALL $@
+      cmd_syscall = $(CC) -m elf_x86_64 -nostdlib $(SYSCFLAGS_$(@F)) \
+		          -Wl,-T,$(filter-out FORCE,$^) -o $@
+
+export CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+
+vdso-flags = -fPIC -shared -Wl,-soname=linux-vdso.so.1 \
+		 $(call ld-option, -Wl$(comma)--hash-style=sysv) \
+		-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
+SYSCFLAGS_vdso.so = $(vdso-flags)
+
+$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
+
+$(obj)/vdso.so: $(src)/vdso.lds $(vobjs) FORCE
+	$(call if_changed,syscall)
+
+CF := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64
+
+$(obj)/vclock_gettime.o: CFLAGS = $(CF)
+$(obj)/vgetcpu.o: CFLAGS = $(CF)
+
+# We also create a special relocatable object that should mirror the symbol
+# table and layout of the linked DSO.  With ld -R we can then refer to
+# these symbols in the kernel code rather than hand-coded addresses.
+extra-y += vdso-syms.o
+$(obj)/built-in.o: $(obj)/vdso-syms.o
+$(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o
+
+SYSCFLAGS_vdso-syms.o = -r -d
+$(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE
+	$(call if_changed,syscall)

trunk/arch/x86_64/vdso/vclock_gettime.c

@@ -0,0 +1,120 @@
+/*
+ * Copyright 2006 Andi Kleen, SUSE Labs.
+ * Subject to the GNU Public License, v.2
+ *
+ * Fast user context implementation of clock_gettime and gettimeofday.
+ *
+ * The code should have no internal unresolved relocations.
+ * Check with readelf after changing.
+ * Also alternative() doesn't work.
+ */
+
+#include <linux/kernel.h>
+#include <linux/posix-timers.h>
+#include <linux/time.h>
+#include <linux/string.h>
+#include <asm/vsyscall.h>
+#include <asm/vgtod.h>
+#include <asm/timex.h>
+#include <asm/hpet.h>
+#include <asm/unistd.h>
+#include <asm/io.h>
+#include <asm/vgtod.h>
+#include "vextern.h"
+
+#define gtod vdso_vsyscall_gtod_data
+
+static long vdso_fallback_gettime(long clock, struct timespec *ts)
+{
+	long ret;
+	asm("syscall" : "=a" (ret) :
+	    "0" (__NR_clock_gettime),"D" (clock), "S" (ts) : "memory");
+	return ret;
+}
+
+static inline long vgetns(void)
+{
+	cycles_t (*vread)(void);
+	vread = gtod->clock.vread;
+	return ((vread() - gtod->clock.cycle_last) * gtod->clock.mult) >>
+		gtod->clock.shift;
+}
+
+static noinline int do_realtime(struct timespec *ts)
+{
+	unsigned long seq, ns;
+	do {
+		seq = read_seqbegin(&gtod->lock);
+		ts->tv_sec = gtod->wall_time_sec;
+		ts->tv_nsec = gtod->wall_time_nsec;
+		ns = vgetns();
+	} while (unlikely(read_seqretry(&gtod->lock, seq)));
+	timespec_add_ns(ts, ns);
+	return 0;
+}
+
+/* Copy of the version in kernel/time.c which we cannot directly access */
+static void vset_normalized_timespec(struct timespec *ts, long sec, long nsec)
+{
+	while (nsec >= NSEC_PER_SEC) {
+		nsec -= NSEC_PER_SEC;
+		++sec;
+	}
+	while (nsec < 0) {
+		nsec += NSEC_PER_SEC;
+		--sec;
+	}
+	ts->tv_sec = sec;
+	ts->tv_nsec = nsec;
+}
+
+static noinline int do_monotonic(struct timespec *ts)
+{
+	unsigned long seq, ns, secs;
+	do {
+		seq = read_seqbegin(&gtod->lock);
+		secs = gtod->wall_time_sec;
+		ns = gtod->wall_time_nsec + vgetns();
+		secs += gtod->wall_to_monotonic.tv_sec;
+		ns += gtod->wall_to_monotonic.tv_nsec;
+	} while (unlikely(read_seqretry(&gtod->lock, seq)));
+	vset_normalized_timespec(ts, secs, ns);
+	return 0;
+}
+
+int __vdso_clock_gettime(clockid_t clock, struct timespec *ts)
+{
+	if (likely(gtod->sysctl_enabled && gtod->clock.vread))
+		switch (clock) {
+		case CLOCK_REALTIME:
+			return do_realtime(ts);
+		case CLOCK_MONOTONIC:
+			return do_monotonic(ts);
+		}
+	return vdso_fallback_gettime(clock, ts);
+}
+int clock_gettime(clockid_t, struct timespec *)
+	__attribute__((weak, alias("__vdso_clock_gettime")));
+
+int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+	long ret;
+	if (likely(gtod->sysctl_enabled && gtod->clock.vread)) {
+		BUILD_BUG_ON(offsetof(struct timeval, tv_usec) !=
+			     offsetof(struct timespec, tv_nsec) ||
+			     sizeof(*tv) != sizeof(struct timespec));
+		do_realtime((struct timespec *)tv);
+		tv->tv_usec /= 1000;
+		if (unlikely(tz != NULL)) {
+			/* This relies on gcc inlining the memcpy. We'll notice
+			   if it ever fails to do so. */
+			memcpy(tz, &gtod->sys_tz, sizeof(struct timezone));
+		}
+		return 0;
+	}
+	asm("syscall" : "=a" (ret) :
+	    "0" (__NR_gettimeofday), "D" (tv), "S" (tz) : "memory");
+	return ret;
+}
+int gettimeofday(struct timeval *, struct timezone *)
+	__attribute__((weak, alias("__vdso_gettimeofday")));

trunk/arch/x86_64/vdso/vdso-note.S

@@ -0,0 +1,12 @@
+/*
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+	.long LINUX_VERSION_CODE
+ELFNOTE_END

trunk/arch/x86_64/vdso/vdso-start.S

@@ -0,0 +1,2 @@
+	.globl vdso_kernel_start
+vdso_kernel_start:

trunk/arch/x86_64/vdso/vdso.S

@@ -0,0 +1,2 @@
+	.section ".vdso","a"
+	.incbin "arch/x86_64/vdso/vdso.so"

trunk/arch/x86_64/vdso/vdso.lds.S

@@ -0,0 +1,77 @@
+/*
+ * Linker script for vsyscall DSO.  The vsyscall page is an ELF shared
+ * object prelinked to its virtual address, and with only one read-only
+ * segment (that fits in one page).  This script controls its layout.
+ */
+#include <asm/asm-offsets.h>
+#include "voffset.h"
+
+#define VDSO_PRELINK 0xffffffffff700000
+
+SECTIONS
+{
+  . = VDSO_PRELINK + SIZEOF_HEADERS;
+
+  .hash           : { *(.hash) }		:text
+  .gnu.hash       : { *(.gnu.hash) }
+  .dynsym         : { *(.dynsym) }
+  .dynstr         : { *(.dynstr) }
+  .gnu.version    : { *(.gnu.version) }
+  .gnu.version_d  : { *(.gnu.version_d) }
+  .gnu.version_r  : { *(.gnu.version_r) }
+
+  /* This linker script is used both with -r and with -shared.
+     For the layouts to match, we need to skip more than enough
+     space for the dynamic symbol table et al.  If this amount
+     is insufficient, ld -shared will barf.  Just increase it here.  */
+  . = VDSO_PRELINK + VDSO_TEXT_OFFSET;
+
+  .text           : { *(.text) }		:text
+  .text.ptr       : { *(.text.ptr) }		:text
+  . = VDSO_PRELINK + 0x900;
+  .data           : { *(.data) }		:text
+  .bss            : { *(.bss) }			:text
+
+  .altinstructions : { *(.altinstructions) }			:text
+  .altinstr_replacement  : { *(.altinstr_replacement) }	:text
+
+  .note		  : { *(.note.*) }		:text :note
+  .eh_frame_hdr   : { *(.eh_frame_hdr) }	:text :eh_frame_hdr
+  .eh_frame       : { KEEP (*(.eh_frame)) }	:text
+  .dynamic        : { *(.dynamic) }		:text :dynamic
+  .useless        : {
+  	*(.got.plt) *(.got)
+	*(.gnu.linkonce.d.*)
+	*(.dynbss)
+	*(.gnu.linkonce.b.*)
+  }						:text
+}
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+  text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
+  dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+  note PT_NOTE FLAGS(4); /* PF_R */
+  eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+  LINUX_2.6 {
+    global:
+	clock_gettime;
+	__vdso_clock_gettime;
+	gettimeofday;
+	__vdso_gettimeofday;
+	getcpu;
+	__vdso_getcpu;
+    local: *;
+  };
+}