Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

Conflicts:
	arch/arm/mach-pxa/corgi.c
	arch/arm/mach-pxa/poodle.c
	arch/arm/mach-pxa/spitz.c

1 files changed, 351 insertions, 0 deletions

diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
new file mode 100644
index 000000000000..25a6a82f1c02
--- /dev/null
+++ b/arch/s390/kernel/vdso.c
@@ -0,0 +1,351 @@
+/*
+ * vdso setup for s390
+ *
+ *  Copyright IBM Corp. 2008
+ *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/elf.h>
+#include <linux/security.h>
+#include <linux/bootmem.h>
+
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/vdso.h>
+
+#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
+extern char vdso32_start, vdso32_end;
+static void *vdso32_kbase = &vdso32_start;
+static unsigned int vdso32_pages;
+static struct page **vdso32_pagelist;
+#endif
+
+#ifdef CONFIG_64BIT
+extern char vdso64_start, vdso64_end;
+static void *vdso64_kbase = &vdso64_start;
+static unsigned int vdso64_pages;
+static struct page **vdso64_pagelist;
+#endif /* CONFIG_64BIT */
+
+/*
+ * Should the kernel map a VDSO page into processes and pass its
+ * address down to glibc upon exec()?
+ */
+unsigned int __read_mostly vdso_enabled = 1;
+
+static int __init vdso_setup(char *s)
+{
+        vdso_enabled = simple_strtoul(s, NULL, 0);
+        return 1;
+}
+__setup("vdso=", vdso_setup);
+
+/*
+ * The vdso data page
+ */
+static union {
+        struct vdso_data        data;
+        u8                      page[PAGE_SIZE];
+} vdso_data_store __attribute__((__section__(".data.page_aligned")));
+struct vdso_data *vdso_data = &vdso_data_store.data;
+
+/*
+ * Setup vdso data page.
+ */
+static void vdso_init_data(struct vdso_data *vd)
+{
+        unsigned int facility_list;
+
+        facility_list = stfl();
+        vd->ectg_available = switch_amode && (facility_list & 1);
+}
+
+#ifdef CONFIG_64BIT
+/*
+ * Setup per cpu vdso data page.
+ */
+static void vdso_init_per_cpu_data(int cpu, struct vdso_per_cpu_data *vpcd)
+{
+}
+
+/*
+ * Allocate/free per cpu vdso data.
+ */
+#ifdef CONFIG_64BIT
+#define SEGMENT_ORDER   2
+#else
+#define SEGMENT_ORDER   1
+#endif
+
+int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore)
+{
+        unsigned long segment_table, page_table, page_frame;
+        u32 *psal, *aste;
+        int i;
+
+        lowcore->vdso_per_cpu_data = __LC_PASTE;
+
+        if (!switch_amode || !vdso_enabled)
+                return 0;
+
+        segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER);
+        page_table = get_zeroed_page(GFP_KERNEL | GFP_DMA);
+        page_frame = get_zeroed_page(GFP_KERNEL);
+        if (!segment_table || !page_table || !page_frame)
+                goto out;
+
+        clear_table((unsigned long *) segment_table, _SEGMENT_ENTRY_EMPTY,
+                    PAGE_SIZE << SEGMENT_ORDER);
+        clear_table((unsigned long *) page_table, _PAGE_TYPE_EMPTY,
+                    256*sizeof(unsigned long));
+
+        *(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table;
+        *(unsigned long *) page_table = _PAGE_RO + page_frame;
+
+        psal = (u32 *) (page_table + 256*sizeof(unsigned long));
+        aste = psal + 32;
+
+        for (i = 4; i < 32; i += 4)
+                psal[i] = 0x80000000;
+
+        lowcore->paste[4] = (u32)(addr_t) psal;
+        psal[0] = 0x20000000;
+        psal[2] = (u32)(addr_t) aste;
+        *(unsigned long *) (aste + 2) = segment_table +
+                _ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT;
+        aste[4] = (u32)(addr_t) psal;
+        lowcore->vdso_per_cpu_data = page_frame;
+
+        vdso_init_per_cpu_data(cpu, (struct vdso_per_cpu_data *) page_frame);
+        return 0;
+
+out:
+        free_page(page_frame);
+        free_page(page_table);
+        free_pages(segment_table, SEGMENT_ORDER);
+        return -ENOMEM;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore)
+{
+        unsigned long segment_table, page_table, page_frame;
+        u32 *psal, *aste;
+
+        if (!switch_amode || !vdso_enabled)
+                return;
+
+        psal = (u32 *)(addr_t) lowcore->paste[4];
+        aste = (u32 *)(addr_t) psal[2];
+        segment_table = *(unsigned long *)(aste + 2) & PAGE_MASK;
+        page_table = *(unsigned long *) segment_table;
+        page_frame = *(unsigned long *) page_table;
+
+        free_page(page_frame);
+        free_page(page_table);
+        free_pages(segment_table, SEGMENT_ORDER);
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+static void __vdso_init_cr5(void *dummy)
+{
+        unsigned long cr5;
+
+        cr5 = offsetof(struct _lowcore, paste);
+        __ctl_load(cr5, 5, 5);
+}
+
+static void vdso_init_cr5(void)
+{
+        if (switch_amode && vdso_enabled)
+                on_each_cpu(__vdso_init_cr5, NULL, 1);
+}
+#endif /* CONFIG_64BIT */
+
+/*
+ * This is called from binfmt_elf, we create the special vma for the
+ * vDSO and insert it into the mm struct tree
+ */
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+        struct mm_struct *mm = current->mm;
+        struct page **vdso_pagelist;
+        unsigned long vdso_pages;
+        unsigned long vdso_base;
+        int rc;
+
+        if (!vdso_enabled)
+                return 0;
+        /*
+         * Only map the vdso for dynamically linked elf binaries.
+         */
+        if (!uses_interp)
+                return 0;
+
+        vdso_base = mm->mmap_base;
+#ifdef CONFIG_64BIT
+        vdso_pagelist = vdso64_pagelist;
+        vdso_pages = vdso64_pages;
+#ifdef CONFIG_COMPAT
+        if (test_thread_flag(TIF_31BIT)) {
+                vdso_pagelist = vdso32_pagelist;
+                vdso_pages = vdso32_pages;
+        }
+#endif
+#else
+        vdso_pagelist = vdso32_pagelist;
+        vdso_pages = vdso32_pages;
+#endif
+
+        /*
+         * vDSO has a problem and was disabled, just don't "enable" it for
+         * the process
+         */
+        if (vdso_pages == 0)
+                return 0;
+
+        current->mm->context.vdso_base = 0;
+
+        /*
+         * pick a base address for the vDSO in process space. We try to put
+         * it at vdso_base which is the "natural" base for it, but we might
+         * fail and end up putting it elsewhere.
+         */
+        down_write(&mm->mmap_sem);
+        vdso_base = get_unmapped_area(NULL, vdso_base,
+                                      vdso_pages << PAGE_SHIFT, 0, 0);
+        if (IS_ERR_VALUE(vdso_base)) {
+                rc = vdso_base;
+                goto out_up;
+        }
+
+        /*
+         * our vma flags don't have VM_WRITE so by default, the process
+         * isn't allowed to write those pages.
+         * gdb can break that with ptrace interface, and thus trigger COW
+         * on those pages but it's then your responsibility to never do that
+         * on the "data" page of the vDSO or you'll stop getting kernel
+         * updates and your nice userland gettimeofday will be totally dead.
+         * It's fine to use that for setting breakpoints in the vDSO code
+         * pages though
+         *
+         * Make sure the vDSO gets into every core dump.
+         * Dumping its contents makes post-mortem fully interpretable later
+         * without matching up the same kernel and hardware config to see
+         * what PC values meant.
+         */
+        rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+                                     VM_READ|VM_EXEC|
+                                     VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
+                                     VM_ALWAYSDUMP,
+                                     vdso_pagelist);
+        if (rc)
+                goto out_up;
+
+        /* Put vDSO base into mm struct */
+        current->mm->context.vdso_base = vdso_base;
+
+        up_write(&mm->mmap_sem);
+        return 0;
+
+out_up:
+        up_write(&mm->mmap_sem);
+        return rc;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+        if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
+                return "[vdso]";
+        return NULL;
+}
+
+static int __init vdso_init(void)
+{
+        int i;
+
+        if (!vdso_enabled)
+                return 0;
+        vdso_init_data(vdso_data);
+#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
+        /* Calculate the size of the 32 bit vDSO */
+        vdso32_pages = ((&vdso32_end - &vdso32_start
+                         + PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;
+
+        /* Make sure pages are in the correct state */
+        vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 1),
+                                  GFP_KERNEL);
+        BUG_ON(vdso32_pagelist == NULL);
+        for (i = 0; i < vdso32_pages - 1; i++) {
+                struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
+                ClearPageReserved(pg);
+                get_page(pg);
+                vdso32_pagelist[i] = pg;
+        }
+        vdso32_pagelist[vdso32_pages - 1] = virt_to_page(vdso_data);
+        vdso32_pagelist[vdso32_pages] = NULL;
+#endif
+
+#ifdef CONFIG_64BIT
+        /* Calculate the size of the 64 bit vDSO */
+        vdso64_pages = ((&vdso64_end - &vdso64_start
+                         + PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;
+
+        /* Make sure pages are in the correct state */
+        vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 1),
+                                  GFP_KERNEL);
+        BUG_ON(vdso64_pagelist == NULL);
+        for (i = 0; i < vdso64_pages - 1; i++) {
+                struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
+                ClearPageReserved(pg);
+                get_page(pg);
+                vdso64_pagelist[i] = pg;
+        }
+        vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data);
+        vdso64_pagelist[vdso64_pages] = NULL;
+#ifndef CONFIG_SMP
+        BUG_ON(vdso_alloc_per_cpu(0, S390_lowcore));
+#endif
+        vdso_init_cr5();
+#endif /* CONFIG_64BIT */
+
+        get_page(virt_to_page(vdso_data));
+
+        smp_wmb();
+
+        return 0;
+}
+arch_initcall(vdso_init);
+
+int in_gate_area_no_task(unsigned long addr)
+{
+        return 0;
+}
+
+int in_gate_area(struct task_struct *task, unsigned long addr)
+{
+        return 0;
+}
+
+struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
+{
+        return NULL;
+}