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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:17:10 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:17:10 +0200
commit7648b1330c335601b7c09c25f77a03cda128fcab (patch)
tree8b92b501dc746b135bf9019472b425e8ef052714 /arch/x86_64
parent185f3d38900f750a4566f87cde6a178f3595a115 (diff)
downloadlinux-linaro-stable-7648b1330c335601b7c09c25f77a03cda128fcab.tar.gz
x86_64: move vdso
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/Makefile2
-rw-r--r--arch/x86_64/vdso/.gitignore1
-rw-r--r--arch/x86_64/vdso/Makefile49
-rw-r--r--arch/x86_64/vdso/vclock_gettime.c121
-rw-r--r--arch/x86_64/vdso/vdso-note.S12
-rw-r--r--arch/x86_64/vdso/vdso-start.S2
-rw-r--r--arch/x86_64/vdso/vdso.S2
-rw-r--r--arch/x86_64/vdso/vdso.lds.S77
-rw-r--r--arch/x86_64/vdso/vextern.h16
-rw-r--r--arch/x86_64/vdso/vgetcpu.c50
-rw-r--r--arch/x86_64/vdso/vma.c140
-rw-r--r--arch/x86_64/vdso/voffset.h1
-rw-r--r--arch/x86_64/vdso/vvar.c12
13 files changed, 1 insertions, 484 deletions
diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index ae48f179d719..d322592e38ab 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -77,7 +77,7 @@ libs-y += arch/x86/lib/
core-y += arch/x86_64/kernel/ \
arch/x86_64/mm/ \
arch/x86/crypto/ \
- arch/x86_64/vdso/
+ arch/x86/vdso/
core-$(CONFIG_IA32_EMULATION) += arch/x86_64/ia32/
drivers-$(CONFIG_PCI) += arch/x86_64/pci/
drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
diff --git a/arch/x86_64/vdso/.gitignore b/arch/x86_64/vdso/.gitignore
deleted file mode 100644
index f8b69d84238e..000000000000
--- a/arch/x86_64/vdso/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-vdso.lds
diff --git a/arch/x86_64/vdso/Makefile b/arch/x86_64/vdso/Makefile
deleted file mode 100644
index 8d03de029d9b..000000000000
--- a/arch/x86_64/vdso/Makefile
+++ /dev/null
@@ -1,49 +0,0 @@
-#
-# 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)
-
-CFL := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64
-
-$(obj)/vclock_gettime.o: CFLAGS = $(CFL)
-$(obj)/vgetcpu.o: CFLAGS = $(CFL)
-
-# We also create a special relocatable object that should mirror the symbol
-# table and layout of the linked DSO. With ld -R we can then refer to
-# these symbols in the kernel code rather than hand-coded addresses.
-extra-y += vdso-syms.o
-$(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)
diff --git a/arch/x86_64/vdso/vclock_gettime.c b/arch/x86_64/vdso/vclock_gettime.c
deleted file mode 100644
index 5b54cdfb2b07..000000000000
--- a/arch/x86_64/vdso/vclock_gettime.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * 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)
-{
- long v;
- cycles_t (*vread)(void);
- vread = gtod->clock.vread;
- v = (vread() - gtod->clock.cycle_last) & gtod->clock.mask;
- return (v * 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")));
diff --git a/arch/x86_64/vdso/vdso-note.S b/arch/x86_64/vdso/vdso-note.S
deleted file mode 100644
index 79a071e4357e..000000000000
--- a/arch/x86_64/vdso/vdso-note.S
+++ /dev/null
@@ -1,12 +0,0 @@
-/*
- * 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
diff --git a/arch/x86_64/vdso/vdso-start.S b/arch/x86_64/vdso/vdso-start.S
deleted file mode 100644
index 2dc2cdb84d67..000000000000
--- a/arch/x86_64/vdso/vdso-start.S
+++ /dev/null
@@ -1,2 +0,0 @@
- .globl vdso_kernel_start
-vdso_kernel_start:
diff --git a/arch/x86_64/vdso/vdso.S b/arch/x86_64/vdso/vdso.S
deleted file mode 100644
index 92e80c1972a7..000000000000
--- a/arch/x86_64/vdso/vdso.S
+++ /dev/null
@@ -1,2 +0,0 @@
- .section ".vdso","a"
- .incbin "arch/x86_64/vdso/vdso.so"
diff --git a/arch/x86_64/vdso/vdso.lds.S b/arch/x86_64/vdso/vdso.lds.S
deleted file mode 100644
index b9a60e665d08..000000000000
--- a/arch/x86_64/vdso/vdso.lds.S
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * 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: *;
- };
-}
diff --git a/arch/x86_64/vdso/vextern.h b/arch/x86_64/vdso/vextern.h
deleted file mode 100644
index 1683ba2ae3e8..000000000000
--- a/arch/x86_64/vdso/vextern.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef VEXTERN
-#include <asm/vsyscall.h>
-#define VEXTERN(x) \
- extern typeof(x) *vdso_ ## x __attribute__((visibility("hidden")));
-#endif
-
-#define VMAGIC 0xfeedbabeabcdefabUL
-
-/* Any kernel variables used in the vDSO must be exported in the main
- kernel's vmlinux.lds.S/vsyscall.h/proper __section and
- put into vextern.h and be referenced as a pointer with vdso prefix.
- The main kernel later fills in the values. */
-
-VEXTERN(jiffies)
-VEXTERN(vgetcpu_mode)
-VEXTERN(vsyscall_gtod_data)
diff --git a/arch/x86_64/vdso/vgetcpu.c b/arch/x86_64/vdso/vgetcpu.c
deleted file mode 100644
index 91f6e85d0fc2..000000000000
--- a/arch/x86_64/vdso/vgetcpu.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * Copyright 2006 Andi Kleen, SUSE Labs.
- * Subject to the GNU Public License, v.2
- *
- * Fast user context implementation of getcpu()
- */
-
-#include <linux/kernel.h>
-#include <linux/getcpu.h>
-#include <linux/jiffies.h>
-#include <linux/time.h>
-#include <asm/vsyscall.h>
-#include <asm/vgtod.h>
-#include "vextern.h"
-
-long __vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
-{
- unsigned int dummy, p;
- unsigned long j = 0;
-
- /* Fast cache - only recompute value once per jiffies and avoid
- relatively costly rdtscp/cpuid otherwise.
- This works because the scheduler usually keeps the process
- on the same CPU and this syscall doesn't guarantee its
- results anyways.
- We do this here because otherwise user space would do it on
- its own in a likely inferior way (no access to jiffies).
- If you don't like it pass NULL. */
- if (tcache && tcache->blob[0] == (j = *vdso_jiffies)) {
- p = tcache->blob[1];
- } else if (*vdso_vgetcpu_mode == VGETCPU_RDTSCP) {
- /* Load per CPU data from RDTSCP */
- rdtscp(dummy, dummy, p);
- } else {
- /* Load per CPU data from GDT */
- asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
- }
- if (tcache) {
- tcache->blob[0] = j;
- tcache->blob[1] = p;
- }
- if (cpu)
- *cpu = p & 0xfff;
- if (node)
- *node = p >> 12;
- return 0;
-}
-
-long getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *tcache)
- __attribute__((weak, alias("__vdso_getcpu")));
diff --git a/arch/x86_64/vdso/vma.c b/arch/x86_64/vdso/vma.c
deleted file mode 100644
index ff9333e5fb08..000000000000
--- a/arch/x86_64/vdso/vma.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * Set up the VMAs to tell the VM about the vDSO.
- * Copyright 2007 Andi Kleen, SUSE Labs.
- * Subject to the GPL, v.2
- */
-#include <linux/mm.h>
-#include <linux/err.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/random.h>
-#include <asm/vsyscall.h>
-#include <asm/vgtod.h>
-#include <asm/proto.h>
-#include "voffset.h"
-
-int vdso_enabled = 1;
-
-#define VEXTERN(x) extern typeof(__ ## x) *vdso_ ## x;
-#include "vextern.h"
-#undef VEXTERN
-
-extern char vdso_kernel_start[], vdso_start[], vdso_end[];
-extern unsigned short vdso_sync_cpuid;
-
-struct page **vdso_pages;
-
-static inline void *var_ref(void *vbase, char *var, char *name)
-{
- unsigned offset = var - &vdso_kernel_start[0] + VDSO_TEXT_OFFSET;
- void *p = vbase + offset;
- if (*(void **)p != (void *)VMAGIC) {
- printk("VDSO: variable %s broken\n", name);
- vdso_enabled = 0;
- }
- return p;
-}
-
-static int __init init_vdso_vars(void)
-{
- int npages = (vdso_end - vdso_start + PAGE_SIZE - 1) / PAGE_SIZE;
- int i;
- char *vbase;
-
- vdso_pages = kmalloc(sizeof(struct page *) * npages, GFP_KERNEL);
- if (!vdso_pages)
- goto oom;
- for (i = 0; i < npages; i++) {
- struct page *p;
- p = alloc_page(GFP_KERNEL);
- if (!p)
- goto oom;
- vdso_pages[i] = p;
- copy_page(page_address(p), vdso_start + i*PAGE_SIZE);
- }
-
- vbase = vmap(vdso_pages, npages, 0, PAGE_KERNEL);
- if (!vbase)
- goto oom;
-
- if (memcmp(vbase, "\177ELF", 4)) {
- printk("VDSO: I'm broken; not ELF\n");
- vdso_enabled = 0;
- }
-
-#define V(x) *(typeof(x) *) var_ref(vbase, (char *)RELOC_HIDE(&x, 0), #x)
-#define VEXTERN(x) \
- V(vdso_ ## x) = &__ ## x;
-#include "vextern.h"
-#undef VEXTERN
- return 0;
-
- oom:
- printk("Cannot allocate vdso\n");
- vdso_enabled = 0;
- return -ENOMEM;
-}
-__initcall(init_vdso_vars);
-
-struct linux_binprm;
-
-/* Put the vdso above the (randomized) stack with another randomized offset.
- This way there is no hole in the middle of address space.
- To save memory make sure it is still in the same PTE as the stack top.
- This doesn't give that many random bits */
-static unsigned long vdso_addr(unsigned long start, unsigned len)
-{
- unsigned long addr, end;
- unsigned offset;
- end = (start + PMD_SIZE - 1) & PMD_MASK;
- if (end >= TASK_SIZE64)
- end = TASK_SIZE64;
- end -= len;
- /* This loses some more bits than a modulo, but is cheaper */
- offset = get_random_int() & (PTRS_PER_PTE - 1);
- addr = start + (offset << PAGE_SHIFT);
- if (addr >= end)
- addr = end;
- return addr;
-}
-
-/* Setup a VMA at program startup for the vsyscall page.
- Not called for compat tasks */
-int arch_setup_additional_pages(struct linux_binprm *bprm, int exstack)
-{
- struct mm_struct *mm = current->mm;
- unsigned long addr;
- int ret;
- unsigned len = round_up(vdso_end - vdso_start, PAGE_SIZE);
-
- if (!vdso_enabled)
- return 0;
-
- down_write(&mm->mmap_sem);
- addr = vdso_addr(mm->start_stack, len);
- addr = get_unmapped_area(NULL, addr, len, 0, 0);
- if (IS_ERR_VALUE(addr)) {
- ret = addr;
- goto up_fail;
- }
-
- ret = install_special_mapping(mm, addr, len,
- VM_READ|VM_EXEC|
- VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
- VM_ALWAYSDUMP,
- vdso_pages);
- if (ret)
- goto up_fail;
-
- current->mm->context.vdso = (void *)addr;
-up_fail:
- up_write(&mm->mmap_sem);
- return ret;
-}
-
-static __init int vdso_setup(char *s)
-{
- vdso_enabled = simple_strtoul(s, NULL, 0);
- return 0;
-}
-__setup("vdso=", vdso_setup);
diff --git a/arch/x86_64/vdso/voffset.h b/arch/x86_64/vdso/voffset.h
deleted file mode 100644
index 4af67c79085f..000000000000
--- a/arch/x86_64/vdso/voffset.h
+++ /dev/null
@@ -1 +0,0 @@
-#define VDSO_TEXT_OFFSET 0x600
diff --git a/arch/x86_64/vdso/vvar.c b/arch/x86_64/vdso/vvar.c
deleted file mode 100644
index 6fc22219a472..000000000000
--- a/arch/x86_64/vdso/vvar.c
+++ /dev/null
@@ -1,12 +0,0 @@
-/* Define pointer to external vDSO variables.
- These are part of the vDSO. The kernel fills in the real addresses
- at boot time. This is done because when the vdso is linked the
- kernel isn't yet and we don't know the final addresses. */
-#include <linux/kernel.h>
-#include <linux/time.h>
-#include <asm/vsyscall.h>
-#include <asm/timex.h>
-#include <asm/vgtod.h>
-
-#define VEXTERN(x) typeof (__ ## x) *vdso_ ## x = (void *)VMAGIC;
-#include "vextern.h"