![Linus Torvalds](/assets/img/avatar_default.png)
This replaces the (in my opinion horrible) VM_UNMAPPED logic with very explicit support for a "remapped page range" aka VM_PFNMAP. It allows a VM area to contain an arbitrary range of page table entries that the VM never touches, and never considers to be normal pages. Any user of "remap_pfn_range()" automatically gets this new functionality, and doesn't even have to mark the pages reserved or indeed mark them any other way. It just works. As a side effect, doing mmap() on /dev/mem works for arbitrary ranges. Sparc update from David in the next commit. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
744 lines
18 KiB
C
744 lines
18 KiB
C
/*
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* linux/arch/ppc64/kernel/vdso.c
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*
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* Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/elf.h>
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#include <linux/security.h>
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#include <linux/bootmem.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/mmu.h>
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#include <asm/mmu_context.h>
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#include <asm/lmb.h>
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#include <asm/machdep.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/vdso.h>
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#include <asm/vdso_datapage.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(fmt...) printk(fmt)
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#else
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#define DBG(fmt...)
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#endif
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/* Max supported size for symbol names */
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#define MAX_SYMNAME 64
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extern char vdso32_start, vdso32_end;
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static void *vdso32_kbase = &vdso32_start;
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unsigned int vdso32_pages;
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unsigned long vdso32_sigtramp;
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unsigned long vdso32_rt_sigtramp;
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#ifdef CONFIG_PPC64
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extern char vdso64_start, vdso64_end;
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static void *vdso64_kbase = &vdso64_start;
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unsigned int vdso64_pages;
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unsigned long vdso64_rt_sigtramp;
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#endif /* CONFIG_PPC64 */
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/*
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* The vdso data page (aka. systemcfg for old ppc64 fans) is here.
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* Once the early boot kernel code no longer needs to muck around
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* with it, it will become dynamically allocated
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*/
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static union {
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struct vdso_data data;
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u8 page[PAGE_SIZE];
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} vdso_data_store __attribute__((__section__(".data.page_aligned")));
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struct vdso_data *vdso_data = &vdso_data_store.data;
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/* Format of the patch table */
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struct vdso_patch_def
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{
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unsigned long ftr_mask, ftr_value;
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const char *gen_name;
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const char *fix_name;
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};
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/* Table of functions to patch based on the CPU type/revision
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*
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* Currently, we only change sync_dicache to do nothing on processors
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* with a coherent icache
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*/
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static struct vdso_patch_def vdso_patches[] = {
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{
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CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
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"__kernel_sync_dicache", "__kernel_sync_dicache_p5"
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},
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{
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CPU_FTR_USE_TB, 0,
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"__kernel_gettimeofday", NULL
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},
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};
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/*
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* Some infos carried around for each of them during parsing at
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* boot time.
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*/
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struct lib32_elfinfo
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{
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Elf32_Ehdr *hdr; /* ptr to ELF */
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Elf32_Sym *dynsym; /* ptr to .dynsym section */
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unsigned long dynsymsize; /* size of .dynsym section */
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char *dynstr; /* ptr to .dynstr section */
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unsigned long text; /* offset of .text section in .so */
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};
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struct lib64_elfinfo
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{
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Elf64_Ehdr *hdr;
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Elf64_Sym *dynsym;
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unsigned long dynsymsize;
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char *dynstr;
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unsigned long text;
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};
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#ifdef __DEBUG
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static void dump_one_vdso_page(struct page *pg, struct page *upg)
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{
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printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
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page_count(pg),
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pg->flags);
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if (upg/* && pg != upg*/) {
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printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
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<< PAGE_SHIFT),
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page_count(upg),
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upg->flags);
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}
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printk("\n");
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}
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static void dump_vdso_pages(struct vm_area_struct * vma)
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{
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int i;
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if (!vma || test_thread_flag(TIF_32BIT)) {
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printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
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for (i=0; i<vdso32_pages; i++) {
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struct page *pg = virt_to_page(vdso32_kbase +
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i*PAGE_SIZE);
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struct page *upg = (vma && vma->vm_mm) ?
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follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
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: NULL;
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dump_one_vdso_page(pg, upg);
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}
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}
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if (!vma || !test_thread_flag(TIF_32BIT)) {
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printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
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for (i=0; i<vdso64_pages; i++) {
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struct page *pg = virt_to_page(vdso64_kbase +
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i*PAGE_SIZE);
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struct page *upg = (vma && vma->vm_mm) ?
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follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
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: NULL;
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dump_one_vdso_page(pg, upg);
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}
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}
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}
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#endif /* DEBUG */
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/*
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* Keep a dummy vma_close for now, it will prevent VMA merging.
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*/
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static void vdso_vma_close(struct vm_area_struct * vma)
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{
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}
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/*
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* Our nopage() function, maps in the actual vDSO kernel pages, they will
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* be mapped read-only by do_no_page(), and eventually COW'ed, either
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* right away for an initial write access, or by do_wp_page().
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*/
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static struct page * vdso_vma_nopage(struct vm_area_struct * vma,
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unsigned long address, int *type)
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{
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unsigned long offset = address - vma->vm_start;
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struct page *pg;
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#ifdef CONFIG_PPC64
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void *vbase = test_thread_flag(TIF_32BIT) ?
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vdso32_kbase : vdso64_kbase;
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#else
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void *vbase = vdso32_kbase;
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#endif
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DBG("vdso_vma_nopage(current: %s, address: %016lx, off: %lx)\n",
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current->comm, address, offset);
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if (address < vma->vm_start || address > vma->vm_end)
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return NOPAGE_SIGBUS;
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/*
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* Last page is systemcfg.
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*/
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if ((vma->vm_end - address) <= PAGE_SIZE)
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pg = virt_to_page(vdso_data);
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else
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pg = virt_to_page(vbase + offset);
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get_page(pg);
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DBG(" ->page count: %d\n", page_count(pg));
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return pg;
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}
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static struct vm_operations_struct vdso_vmops = {
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.close = vdso_vma_close,
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.nopage = vdso_vma_nopage,
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};
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/*
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* This is called from binfmt_elf, we create the special vma for the
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* vDSO and insert it into the mm struct tree
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*/
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int arch_setup_additional_pages(struct linux_binprm *bprm,
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int executable_stack)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long vdso_pages;
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unsigned long vdso_base;
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#ifdef CONFIG_PPC64
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if (test_thread_flag(TIF_32BIT)) {
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vdso_pages = vdso32_pages;
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vdso_base = VDSO32_MBASE;
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} else {
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vdso_pages = vdso64_pages;
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vdso_base = VDSO64_MBASE;
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}
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#else
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vdso_pages = vdso32_pages;
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vdso_base = VDSO32_MBASE;
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#endif
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current->thread.vdso_base = 0;
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/* vDSO has a problem and was disabled, just don't "enable" it for the
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* process
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*/
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if (vdso_pages == 0)
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return 0;
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vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
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if (vma == NULL)
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return -ENOMEM;
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memset(vma, 0, sizeof(*vma));
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/* Add a page to the vdso size for the data page */
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vdso_pages ++;
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/*
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* pick a base address for the vDSO in process space. We try to put it
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* at vdso_base which is the "natural" base for it, but we might fail
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* and end up putting it elsewhere.
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*/
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vdso_base = get_unmapped_area(NULL, vdso_base,
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vdso_pages << PAGE_SHIFT, 0, 0);
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if (vdso_base & ~PAGE_MASK) {
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kmem_cache_free(vm_area_cachep, vma);
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return (int)vdso_base;
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}
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current->thread.vdso_base = vdso_base;
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vma->vm_mm = mm;
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vma->vm_start = current->thread.vdso_base;
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vma->vm_end = vma->vm_start + (vdso_pages << PAGE_SHIFT);
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/*
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* our vma flags don't have VM_WRITE so by default, the process isn't
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* allowed to write those pages.
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* gdb can break that with ptrace interface, and thus trigger COW on
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* those pages but it's then your responsibility to never do that on
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* the "data" page of the vDSO or you'll stop getting kernel updates
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* and your nice userland gettimeofday will be totally dead.
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* It's fine to use that for setting breakpoints in the vDSO code
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* pages though
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*/
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vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
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vma->vm_flags |= mm->def_flags;
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vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
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vma->vm_ops = &vdso_vmops;
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down_write(&mm->mmap_sem);
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if (insert_vm_struct(mm, vma)) {
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up_write(&mm->mmap_sem);
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kmem_cache_free(vm_area_cachep, vma);
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return -ENOMEM;
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}
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mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
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up_write(&mm->mmap_sem);
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return 0;
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}
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static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
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unsigned long *size)
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{
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Elf32_Shdr *sechdrs;
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unsigned int i;
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char *secnames;
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/* Grab section headers and strings so we can tell who is who */
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sechdrs = (void *)ehdr + ehdr->e_shoff;
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secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
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/* Find the section they want */
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for (i = 1; i < ehdr->e_shnum; i++) {
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if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
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if (size)
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*size = sechdrs[i].sh_size;
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return (void *)ehdr + sechdrs[i].sh_offset;
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}
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}
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*size = 0;
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return NULL;
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}
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static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
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const char *symname)
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{
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unsigned int i;
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char name[MAX_SYMNAME], *c;
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for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
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if (lib->dynsym[i].st_name == 0)
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continue;
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strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
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MAX_SYMNAME);
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c = strchr(name, '@');
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if (c)
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*c = 0;
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if (strcmp(symname, name) == 0)
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return &lib->dynsym[i];
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}
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return NULL;
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}
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/* Note that we assume the section is .text and the symbol is relative to
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* the library base
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*/
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static unsigned long __init find_function32(struct lib32_elfinfo *lib,
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const char *symname)
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{
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Elf32_Sym *sym = find_symbol32(lib, symname);
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if (sym == NULL) {
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printk(KERN_WARNING "vDSO32: function %s not found !\n",
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symname);
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return 0;
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}
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return sym->st_value - VDSO32_LBASE;
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}
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static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
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struct lib64_elfinfo *v64,
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const char *orig, const char *fix)
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{
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Elf32_Sym *sym32_gen, *sym32_fix;
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sym32_gen = find_symbol32(v32, orig);
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if (sym32_gen == NULL) {
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printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
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return -1;
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}
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if (fix == NULL) {
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sym32_gen->st_name = 0;
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return 0;
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}
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sym32_fix = find_symbol32(v32, fix);
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if (sym32_fix == NULL) {
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printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
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return -1;
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}
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sym32_gen->st_value = sym32_fix->st_value;
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sym32_gen->st_size = sym32_fix->st_size;
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sym32_gen->st_info = sym32_fix->st_info;
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sym32_gen->st_other = sym32_fix->st_other;
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sym32_gen->st_shndx = sym32_fix->st_shndx;
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return 0;
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}
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#ifdef CONFIG_PPC64
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static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
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unsigned long *size)
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{
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Elf64_Shdr *sechdrs;
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unsigned int i;
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char *secnames;
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/* Grab section headers and strings so we can tell who is who */
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sechdrs = (void *)ehdr + ehdr->e_shoff;
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secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
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/* Find the section they want */
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for (i = 1; i < ehdr->e_shnum; i++) {
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if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
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if (size)
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*size = sechdrs[i].sh_size;
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return (void *)ehdr + sechdrs[i].sh_offset;
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}
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}
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if (size)
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*size = 0;
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return NULL;
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}
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static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
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const char *symname)
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{
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unsigned int i;
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char name[MAX_SYMNAME], *c;
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for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
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if (lib->dynsym[i].st_name == 0)
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continue;
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strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
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MAX_SYMNAME);
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c = strchr(name, '@');
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if (c)
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*c = 0;
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if (strcmp(symname, name) == 0)
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return &lib->dynsym[i];
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}
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return NULL;
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}
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/* Note that we assume the section is .text and the symbol is relative to
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* the library base
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*/
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static unsigned long __init find_function64(struct lib64_elfinfo *lib,
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const char *symname)
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{
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Elf64_Sym *sym = find_symbol64(lib, symname);
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if (sym == NULL) {
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printk(KERN_WARNING "vDSO64: function %s not found !\n",
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symname);
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return 0;
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}
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#ifdef VDS64_HAS_DESCRIPTORS
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return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
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VDSO64_LBASE;
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#else
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return sym->st_value - VDSO64_LBASE;
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#endif
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}
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static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
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struct lib64_elfinfo *v64,
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const char *orig, const char *fix)
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{
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Elf64_Sym *sym64_gen, *sym64_fix;
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sym64_gen = find_symbol64(v64, orig);
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if (sym64_gen == NULL) {
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printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
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return -1;
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}
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if (fix == NULL) {
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sym64_gen->st_name = 0;
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return 0;
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}
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sym64_fix = find_symbol64(v64, fix);
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if (sym64_fix == NULL) {
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printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
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return -1;
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}
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sym64_gen->st_value = sym64_fix->st_value;
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sym64_gen->st_size = sym64_fix->st_size;
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sym64_gen->st_info = sym64_fix->st_info;
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sym64_gen->st_other = sym64_fix->st_other;
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sym64_gen->st_shndx = sym64_fix->st_shndx;
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return 0;
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|
}
|
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
|
|
static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
|
|
struct lib64_elfinfo *v64)
|
|
{
|
|
void *sect;
|
|
|
|
/*
|
|
* Locate symbol tables & text section
|
|
*/
|
|
|
|
v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
|
|
v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
|
|
if (v32->dynsym == NULL || v32->dynstr == NULL) {
|
|
printk(KERN_ERR "vDSO32: required symbol section not found\n");
|
|
return -1;
|
|
}
|
|
sect = find_section32(v32->hdr, ".text", NULL);
|
|
if (sect == NULL) {
|
|
printk(KERN_ERR "vDSO32: the .text section was not found\n");
|
|
return -1;
|
|
}
|
|
v32->text = sect - vdso32_kbase;
|
|
|
|
#ifdef CONFIG_PPC64
|
|
v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
|
|
v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
|
|
if (v64->dynsym == NULL || v64->dynstr == NULL) {
|
|
printk(KERN_ERR "vDSO64: required symbol section not found\n");
|
|
return -1;
|
|
}
|
|
sect = find_section64(v64->hdr, ".text", NULL);
|
|
if (sect == NULL) {
|
|
printk(KERN_ERR "vDSO64: the .text section was not found\n");
|
|
return -1;
|
|
}
|
|
v64->text = sect - vdso64_kbase;
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
|
|
struct lib64_elfinfo *v64)
|
|
{
|
|
/*
|
|
* Find signal trampolines
|
|
*/
|
|
|
|
#ifdef CONFIG_PPC64
|
|
vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
|
|
#endif
|
|
vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32");
|
|
vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
|
|
}
|
|
|
|
static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
|
|
struct lib64_elfinfo *v64)
|
|
{
|
|
Elf32_Sym *sym32;
|
|
#ifdef CONFIG_PPC64
|
|
Elf64_Sym *sym64;
|
|
|
|
sym64 = find_symbol64(v64, "__kernel_datapage_offset");
|
|
if (sym64 == NULL) {
|
|
printk(KERN_ERR "vDSO64: Can't find symbol "
|
|
"__kernel_datapage_offset !\n");
|
|
return -1;
|
|
}
|
|
*((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
|
|
(vdso64_pages << PAGE_SHIFT) -
|
|
(sym64->st_value - VDSO64_LBASE);
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
sym32 = find_symbol32(v32, "__kernel_datapage_offset");
|
|
if (sym32 == NULL) {
|
|
printk(KERN_ERR "vDSO32: Can't find symbol "
|
|
"__kernel_datapage_offset !\n");
|
|
return -1;
|
|
}
|
|
*((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
|
|
(vdso32_pages << PAGE_SHIFT) -
|
|
(sym32->st_value - VDSO32_LBASE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
|
|
struct lib64_elfinfo *v64)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
|
|
struct vdso_patch_def *patch = &vdso_patches[i];
|
|
int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
|
|
== patch->ftr_value;
|
|
if (!match)
|
|
continue;
|
|
|
|
DBG("replacing %s with %s...\n", patch->gen_name,
|
|
patch->fix_name ? "NONE" : patch->fix_name);
|
|
|
|
/*
|
|
* Patch the 32 bits and 64 bits symbols. Note that we do not
|
|
* patch the "." symbol on 64 bits.
|
|
* It would be easy to do, but doesn't seem to be necessary,
|
|
* patching the OPD symbol is enough.
|
|
*/
|
|
vdso_do_func_patch32(v32, v64, patch->gen_name,
|
|
patch->fix_name);
|
|
#ifdef CONFIG_PPC64
|
|
vdso_do_func_patch64(v32, v64, patch->gen_name,
|
|
patch->fix_name);
|
|
#endif /* CONFIG_PPC64 */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static __init int vdso_setup(void)
|
|
{
|
|
struct lib32_elfinfo v32;
|
|
struct lib64_elfinfo v64;
|
|
|
|
v32.hdr = vdso32_kbase;
|
|
#ifdef CONFIG_PPC64
|
|
v64.hdr = vdso64_kbase;
|
|
#endif
|
|
if (vdso_do_find_sections(&v32, &v64))
|
|
return -1;
|
|
|
|
if (vdso_fixup_datapage(&v32, &v64))
|
|
return -1;
|
|
|
|
if (vdso_fixup_alt_funcs(&v32, &v64))
|
|
return -1;
|
|
|
|
vdso_setup_trampolines(&v32, &v64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called from setup_arch to initialize the bitmap of available
|
|
* syscalls in the systemcfg page
|
|
*/
|
|
static void __init vdso_setup_syscall_map(void)
|
|
{
|
|
unsigned int i;
|
|
extern unsigned long *sys_call_table;
|
|
extern unsigned long sys_ni_syscall;
|
|
|
|
|
|
for (i = 0; i < __NR_syscalls; i++) {
|
|
#ifdef CONFIG_PPC64
|
|
if (sys_call_table[i*2] != sys_ni_syscall)
|
|
vdso_data->syscall_map_64[i >> 5] |=
|
|
0x80000000UL >> (i & 0x1f);
|
|
if (sys_call_table[i*2+1] != sys_ni_syscall)
|
|
vdso_data->syscall_map_32[i >> 5] |=
|
|
0x80000000UL >> (i & 0x1f);
|
|
#else /* CONFIG_PPC64 */
|
|
if (sys_call_table[i] != sys_ni_syscall)
|
|
vdso_data->syscall_map_32[i >> 5] |=
|
|
0x80000000UL >> (i & 0x1f);
|
|
#endif /* CONFIG_PPC64 */
|
|
}
|
|
}
|
|
|
|
|
|
void __init vdso_init(void)
|
|
{
|
|
int i;
|
|
|
|
#ifdef CONFIG_PPC64
|
|
/*
|
|
* Fill up the "systemcfg" stuff for backward compatiblity
|
|
*/
|
|
strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
|
|
vdso_data->version.major = SYSTEMCFG_MAJOR;
|
|
vdso_data->version.minor = SYSTEMCFG_MINOR;
|
|
vdso_data->processor = mfspr(SPRN_PVR);
|
|
vdso_data->platform = _machine;
|
|
vdso_data->physicalMemorySize = lmb_phys_mem_size();
|
|
vdso_data->dcache_size = ppc64_caches.dsize;
|
|
vdso_data->dcache_line_size = ppc64_caches.dline_size;
|
|
vdso_data->icache_size = ppc64_caches.isize;
|
|
vdso_data->icache_line_size = ppc64_caches.iline_size;
|
|
|
|
/*
|
|
* Calculate the size of the 64 bits vDSO
|
|
*/
|
|
vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
|
|
DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
|
|
/*
|
|
* Calculate the size of the 32 bits vDSO
|
|
*/
|
|
vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
|
|
DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
|
|
|
|
|
|
/*
|
|
* Setup the syscall map in the vDOS
|
|
*/
|
|
vdso_setup_syscall_map();
|
|
/*
|
|
* Initialize the vDSO images in memory, that is do necessary
|
|
* fixups of vDSO symbols, locate trampolines, etc...
|
|
*/
|
|
if (vdso_setup()) {
|
|
printk(KERN_ERR "vDSO setup failure, not enabled !\n");
|
|
vdso32_pages = 0;
|
|
#ifdef CONFIG_PPC64
|
|
vdso64_pages = 0;
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
/* Make sure pages are in the correct state */
|
|
for (i = 0; i < vdso32_pages; i++) {
|
|
struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
|
|
ClearPageReserved(pg);
|
|
get_page(pg);
|
|
|
|
}
|
|
#ifdef CONFIG_PPC64
|
|
for (i = 0; i < vdso64_pages; i++) {
|
|
struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
|
|
ClearPageReserved(pg);
|
|
get_page(pg);
|
|
}
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
get_page(virt_to_page(vdso_data));
|
|
}
|
|
|
|
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;
|
|
}
|
|
|