--- /dev/null
+/*
+ * 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 <linux/compat.h>
+#include <asm/asm-offsets.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/vdso.h>
+#include <asm/facility.h>
+
+#ifdef 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
+
+extern char vdso64_start, vdso64_end;
+static void *vdso64_kbase = &vdso64_start;
+static unsigned int vdso64_pages;
+static struct page **vdso64_pagelist;
+
+/*
+ * 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)
+{
+ unsigned long val;
+ int rc;
+
+ rc = 0;
+ if (strncmp(s, "on", 3) == 0)
+ vdso_enabled = 1;
+ else if (strncmp(s, "off", 4) == 0)
+ vdso_enabled = 0;
+ else {
+ rc = kstrtoul(s, 0, &val);
+ vdso_enabled = rc ? 0 : !!val;
+ }
+ return !rc;
+}
+__setup("vdso=", vdso_setup);
+
+/*
+ * The vdso data page
+ */
+static union {
+ struct vdso_data data;
+ u8 page[PAGE_SIZE];
+} vdso_data_store __page_aligned_data;
+struct vdso_data *vdso_data = &vdso_data_store.data;
+
+/*
+ * Setup vdso data page.
+ */
+static void vdso_init_data(struct vdso_data *vd)
+{
+ vd->ectg_available = test_facility(31);
+}
+
+/*
+ * Allocate/free per cpu vdso data.
+ */
+#define SEGMENT_ORDER 2
+
+int vdso_alloc_per_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 (!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_INVALID,
+ 256*sizeof(unsigned long));
+
+ *(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table;
+ *(unsigned long *) page_table = _PAGE_PROTECT + 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] = 0x02000000;
+ 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;
+
+ return 0;
+
+out:
+ free_page(page_frame);
+ free_page(page_table);
+ free_pages(segment_table, SEGMENT_ORDER);
+ return -ENOMEM;
+}
+
+void vdso_free_per_cpu(struct _lowcore *lowcore)
+{
+ unsigned long segment_table, page_table, page_frame;
+ u32 *psal, *aste;
+
+ if (!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);
+}
+
+static void vdso_init_cr5(void)
+{
+ unsigned long cr5;
+
+ if (!vdso_enabled)
+ return;
+ cr5 = offsetof(struct _lowcore, paste);
+ __ctl_load(cr5, 5, 5);
+}
+
+/*
+ * 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_pagelist = vdso64_pagelist;
+ vdso_pages = vdso64_pages;
+#ifdef CONFIG_COMPAT
+ if (is_compat_task()) {
+ 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, 0, vdso_pages << PAGE_SHIFT, 0, 0);
+ if (IS_ERR_VALUE(vdso_base)) {
+ rc = vdso_base;
+ goto out_up;
+ }
+
+ /*
+ * Put vDSO base into mm struct. We need to do this before calling
+ * install_special_mapping or the perf counter mmap tracking code
+ * will fail to recognise it as a vDSO (since arch_vma_name fails).
+ */
+ current->mm->context.vdso_base = vdso_base;
+
+ /*
+ * 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.
+ */
+ rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+ VM_READ|VM_EXEC|
+ VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
+ vdso_pagelist);
+ if (rc)
+ current->mm->context.vdso_base = 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);
+#ifdef 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
+
+ /* 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;
+ if (vdso_alloc_per_cpu(&S390_lowcore))
+ BUG();
+ vdso_init_cr5();
+
+ get_page(virt_to_page(vdso_data));
+
+ smp_wmb();
+
+ return 0;
+}
+early_initcall(vdso_init);
Code Review / kvmfornfv.git / blobdiff