2009-09-21 06:14:15 +08:00
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2005-11-11 18:15:21 +08:00
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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/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/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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2010-07-12 12:36:09 +08:00
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#include <linux/memblock.h>
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2005-11-11 18:15:21 +08:00
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#include <asm/pgtable.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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2008-02-14 08:56:49 +08:00
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#include <asm/prom.h>
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2005-11-11 18:15:21 +08:00
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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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2006-03-28 20:15:54 +08:00
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#include <asm/firmware.h>
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2005-11-11 18:15:21 +08:00
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#include <asm/vdso.h>
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#include <asm/vdso_datapage.h>
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2013-10-28 22:20:51 +08:00
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#include <asm/setup.h>
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2006-10-20 09:47:18 +08:00
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2005-11-11 18:15:21 +08:00
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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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2009-10-04 10:35:41 +08:00
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/* The alignment of the vDSO */
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#define VDSO_ALIGNMENT (1 << 16)
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2007-02-12 10:31:08 +08:00
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static unsigned int vdso32_pages;
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2015-05-11 18:01:02 +08:00
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static void *vdso32_kbase;
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2007-02-12 10:31:08 +08:00
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static struct page **vdso32_pagelist;
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2005-11-11 18:15:21 +08:00
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unsigned long vdso32_sigtramp;
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unsigned long vdso32_rt_sigtramp;
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2015-05-11 18:01:02 +08:00
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#ifdef CONFIG_VDSO32
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extern char vdso32_start, vdso32_end;
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#endif
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2005-11-11 18:15:21 +08:00
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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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2007-02-12 10:31:08 +08:00
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static unsigned int vdso64_pages;
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static struct page **vdso64_pagelist;
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2005-11-11 18:15:21 +08:00
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unsigned long vdso64_rt_sigtramp;
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#endif /* CONFIG_PPC64 */
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2007-02-12 10:31:08 +08:00
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static int vdso_ready;
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2005-11-11 18:15:21 +08:00
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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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2009-09-21 06:14:15 +08:00
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} vdso_data_store __page_aligned_data;
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2005-11-11 18:15:21 +08:00
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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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2007-09-19 12:21:56 +08:00
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{
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CPU_FTR_USE_TB, 0,
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"__kernel_clock_gettime", NULL
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},
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{
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CPU_FTR_USE_TB, 0,
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"__kernel_clock_getres", NULL
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},
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{
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CPU_FTR_USE_TB, 0,
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"__kernel_get_tbfreq", NULL
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},
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2013-04-22 17:29:33 +08:00
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{
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CPU_FTR_USE_TB, 0,
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"__kernel_time", NULL
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},
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2005-11-11 18:15:21 +08:00
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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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/*
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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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2008-12-25 20:38:35 +08:00
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int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
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2005-11-11 18:15:21 +08:00
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{
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struct mm_struct *mm = current->mm;
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2007-02-09 06:20:43 +08:00
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struct page **vdso_pagelist;
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2005-11-11 18:15:21 +08:00
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unsigned long vdso_pages;
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unsigned long vdso_base;
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2006-05-30 11:51:37 +08:00
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int rc;
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2005-11-11 18:15:21 +08:00
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2007-02-12 10:31:08 +08:00
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if (!vdso_ready)
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return 0;
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2005-11-11 18:15:21 +08:00
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#ifdef CONFIG_PPC64
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2010-08-27 11:49:11 +08:00
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if (is_32bit_task()) {
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2007-02-09 06:20:43 +08:00
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vdso_pagelist = vdso32_pagelist;
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2005-11-11 18:15:21 +08:00
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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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2007-02-09 06:20:43 +08:00
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vdso_pagelist = vdso64_pagelist;
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2005-11-11 18:15:21 +08:00
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vdso_pages = vdso64_pages;
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2009-07-14 04:53:51 +08:00
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/*
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* On 64bit we don't have a preferred map address. This
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* allows get_unmapped_area to find an area near other mmaps
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* and most likely share a SLB entry.
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*/
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vdso_base = 0;
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2005-11-11 18:15:21 +08:00
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}
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#else
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2007-02-09 06:20:43 +08:00
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vdso_pagelist = vdso32_pagelist;
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2005-11-11 18:15:21 +08:00
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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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2006-05-30 11:51:37 +08:00
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current->mm->context.vdso_base = 0;
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2005-11-11 18:15:21 +08:00
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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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/* 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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2009-10-04 10:35:41 +08:00
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* Add enough to the size so that the result can be aligned.
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2005-11-11 18:15:21 +08:00
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*/
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2006-05-30 11:51:37 +08:00
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down_write(&mm->mmap_sem);
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2005-11-11 18:15:21 +08:00
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vdso_base = get_unmapped_area(NULL, vdso_base,
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2009-10-04 10:35:41 +08:00
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(vdso_pages << PAGE_SHIFT) +
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((VDSO_ALIGNMENT - 1) & PAGE_MASK),
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0, 0);
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2006-05-30 11:51:37 +08:00
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if (IS_ERR_VALUE(vdso_base)) {
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rc = vdso_base;
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goto fail_mmapsem;
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2005-11-11 18:15:21 +08:00
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}
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2009-10-04 10:35:41 +08:00
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/* Add required alignment. */
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vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
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2009-09-22 00:57:40 +08:00
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/*
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* Put vDSO base into mm struct. We need to do this before calling
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* install_special_mapping or the perf counter mmap tracking code
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* will fail to recognise it as a vDSO (since arch_vma_name fails).
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*/
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current->mm->context.vdso_base = vdso_base;
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2005-11-11 18:15:21 +08:00
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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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coredump: remove VM_ALWAYSDUMP flag
The motivation for this patchset was that I was looking at a way for a
qemu-kvm process, to exclude the guest memory from its core dump, which
can be quite large. There are already a number of filter flags in
/proc/<pid>/coredump_filter, however, these allow one to specify 'types'
of kernel memory, not specific address ranges (which is needed in this
case).
Since there are no more vma flags available, the first patch eliminates
the need for the 'VM_ALWAYSDUMP' flag. The flag is used internally by
the kernel to mark vdso and vsyscall pages. However, it is simple
enough to check if a vma covers a vdso or vsyscall page without the need
for this flag.
The second patch then replaces the 'VM_ALWAYSDUMP' flag with a new
'VM_NODUMP' flag, which can be set by userspace using new madvise flags:
'MADV_DONTDUMP', and unset via 'MADV_DODUMP'. The core dump filters
continue to work the same as before unless 'MADV_DONTDUMP' is set on the
region.
The qemu code which implements this features is at:
http://people.redhat.com/~jbaron/qemu-dump/qemu-dump.patch
In my testing the qemu core dump shrunk from 383MB -> 13MB with this
patch.
I also believe that the 'MADV_DONTDUMP' flag might be useful for
security sensitive apps, which might want to select which areas are
dumped.
This patch:
The VM_ALWAYSDUMP flag is currently used by the coredump code to
indicate that a vma is part of a vsyscall or vdso section. However, we
can determine if a vma is in one these sections by checking it against
the gate_vma and checking for a non-NULL return value from
arch_vma_name(). Thus, freeing a valuable vma bit.
Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Roland McGrath <roland@hack.frob.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-24 06:02:51 +08:00
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* pages though.
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2007-01-26 16:56:51 +08:00
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*/
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2007-02-09 06:20:43 +08:00
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rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
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VM_READ|VM_EXEC|
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coredump: remove VM_ALWAYSDUMP flag
The motivation for this patchset was that I was looking at a way for a
qemu-kvm process, to exclude the guest memory from its core dump, which
can be quite large. There are already a number of filter flags in
/proc/<pid>/coredump_filter, however, these allow one to specify 'types'
of kernel memory, not specific address ranges (which is needed in this
case).
Since there are no more vma flags available, the first patch eliminates
the need for the 'VM_ALWAYSDUMP' flag. The flag is used internally by
the kernel to mark vdso and vsyscall pages. However, it is simple
enough to check if a vma covers a vdso or vsyscall page without the need
for this flag.
The second patch then replaces the 'VM_ALWAYSDUMP' flag with a new
'VM_NODUMP' flag, which can be set by userspace using new madvise flags:
'MADV_DONTDUMP', and unset via 'MADV_DODUMP'. The core dump filters
continue to work the same as before unless 'MADV_DONTDUMP' is set on the
region.
The qemu code which implements this features is at:
http://people.redhat.com/~jbaron/qemu-dump/qemu-dump.patch
In my testing the qemu core dump shrunk from 383MB -> 13MB with this
patch.
I also believe that the 'MADV_DONTDUMP' flag might be useful for
security sensitive apps, which might want to select which areas are
dumped.
This patch:
The VM_ALWAYSDUMP flag is currently used by the coredump code to
indicate that a vma is part of a vsyscall or vdso section. However, we
can determine if a vma is in one these sections by checking it against
the gate_vma and checking for a non-NULL return value from
arch_vma_name(). Thus, freeing a valuable vma bit.
Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Roland McGrath <roland@hack.frob.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Avi Kivity <avi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-24 06:02:51 +08:00
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
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2007-02-09 06:20:43 +08:00
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vdso_pagelist);
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2009-09-22 00:57:40 +08:00
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if (rc) {
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current->mm->context.vdso_base = 0;
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2007-02-09 06:20:43 +08:00
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goto fail_mmapsem;
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2009-09-22 00:57:40 +08:00
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}
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2007-02-09 06:20:43 +08:00
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2005-11-11 18:15:21 +08:00
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up_write(&mm->mmap_sem);
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return 0;
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2006-05-30 11:51:37 +08:00
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fail_mmapsem:
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up_write(&mm->mmap_sem);
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return rc;
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}
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const char *arch_vma_name(struct vm_area_struct *vma)
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{
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if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
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return "[vdso]";
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return NULL;
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2005-11-11 18:15:21 +08:00
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}
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2006-05-30 11:51:37 +08:00
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2015-05-11 18:01:02 +08:00
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#ifdef CONFIG_VDSO32
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2005-11-11 18:15:21 +08:00
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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++) {
|
|
|
|
if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
|
|
|
|
if (size)
|
|
|
|
*size = sechdrs[i].sh_size;
|
|
|
|
return (void *)ehdr + sechdrs[i].sh_offset;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
*size = 0;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
|
|
|
|
const char *symname)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
char name[MAX_SYMNAME], *c;
|
|
|
|
|
|
|
|
for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
|
|
|
|
if (lib->dynsym[i].st_name == 0)
|
|
|
|
continue;
|
|
|
|
strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
|
|
|
|
MAX_SYMNAME);
|
|
|
|
c = strchr(name, '@');
|
|
|
|
if (c)
|
|
|
|
*c = 0;
|
|
|
|
if (strcmp(symname, name) == 0)
|
|
|
|
return &lib->dynsym[i];
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Note that we assume the section is .text and the symbol is relative to
|
|
|
|
* the library base
|
|
|
|
*/
|
|
|
|
static unsigned long __init find_function32(struct lib32_elfinfo *lib,
|
|
|
|
const char *symname)
|
|
|
|
{
|
|
|
|
Elf32_Sym *sym = find_symbol32(lib, symname);
|
|
|
|
|
|
|
|
if (sym == NULL) {
|
|
|
|
printk(KERN_WARNING "vDSO32: function %s not found !\n",
|
|
|
|
symname);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return sym->st_value - VDSO32_LBASE;
|
|
|
|
}
|
|
|
|
|
2008-02-14 05:30:52 +08:00
|
|
|
static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
|
|
|
|
struct lib64_elfinfo *v64,
|
|
|
|
const char *orig, const char *fix)
|
2005-11-11 18:15:21 +08:00
|
|
|
{
|
|
|
|
Elf32_Sym *sym32_gen, *sym32_fix;
|
|
|
|
|
|
|
|
sym32_gen = find_symbol32(v32, orig);
|
|
|
|
if (sym32_gen == NULL) {
|
|
|
|
printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (fix == NULL) {
|
|
|
|
sym32_gen->st_name = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
sym32_fix = find_symbol32(v32, fix);
|
|
|
|
if (sym32_fix == NULL) {
|
|
|
|
printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
sym32_gen->st_value = sym32_fix->st_value;
|
|
|
|
sym32_gen->st_size = sym32_fix->st_size;
|
|
|
|
sym32_gen->st_info = sym32_fix->st_info;
|
|
|
|
sym32_gen->st_other = sym32_fix->st_other;
|
|
|
|
sym32_gen->st_shndx = sym32_fix->st_shndx;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2015-05-11 18:01:02 +08:00
|
|
|
#else /* !CONFIG_VDSO32 */
|
|
|
|
static unsigned long __init find_function32(struct lib32_elfinfo *lib,
|
|
|
|
const char *symname)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
|
|
|
|
struct lib64_elfinfo *v64,
|
|
|
|
const char *orig, const char *fix)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_VDSO32 */
|
2005-11-11 18:15:21 +08:00
|
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC64
|
|
|
|
|
|
|
|
static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
|
|
|
|
unsigned long *size)
|
|
|
|
{
|
|
|
|
Elf64_Shdr *sechdrs;
|
|
|
|
unsigned int i;
|
|
|
|
char *secnames;
|
|
|
|
|
|
|
|
/* Grab section headers and strings so we can tell who is who */
|
|
|
|
sechdrs = (void *)ehdr + ehdr->e_shoff;
|
|
|
|
secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
|
|
|
|
|
|
|
|
/* Find the section they want */
|
|
|
|
for (i = 1; i < ehdr->e_shnum; i++) {
|
|
|
|
if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
|
|
|
|
if (size)
|
|
|
|
*size = sechdrs[i].sh_size;
|
|
|
|
return (void *)ehdr + sechdrs[i].sh_offset;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (size)
|
|
|
|
*size = 0;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
|
|
|
|
const char *symname)
|
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
char name[MAX_SYMNAME], *c;
|
|
|
|
|
|
|
|
for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
|
|
|
|
if (lib->dynsym[i].st_name == 0)
|
|
|
|
continue;
|
|
|
|
strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
|
|
|
|
MAX_SYMNAME);
|
|
|
|
c = strchr(name, '@');
|
|
|
|
if (c)
|
|
|
|
*c = 0;
|
|
|
|
if (strcmp(symname, name) == 0)
|
|
|
|
return &lib->dynsym[i];
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Note that we assume the section is .text and the symbol is relative to
|
|
|
|
* the library base
|
|
|
|
*/
|
|
|
|
static unsigned long __init find_function64(struct lib64_elfinfo *lib,
|
|
|
|
const char *symname)
|
|
|
|
{
|
|
|
|
Elf64_Sym *sym = find_symbol64(lib, symname);
|
|
|
|
|
|
|
|
if (sym == NULL) {
|
|
|
|
printk(KERN_WARNING "vDSO64: function %s not found !\n",
|
|
|
|
symname);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#ifdef VDS64_HAS_DESCRIPTORS
|
|
|
|
return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
|
|
|
|
VDSO64_LBASE;
|
|
|
|
#else
|
|
|
|
return sym->st_value - VDSO64_LBASE;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2008-02-14 05:30:52 +08:00
|
|
|
static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
|
|
|
|
struct lib64_elfinfo *v64,
|
|
|
|
const char *orig, const char *fix)
|
2005-11-11 18:15:21 +08:00
|
|
|
{
|
|
|
|
Elf64_Sym *sym64_gen, *sym64_fix;
|
|
|
|
|
|
|
|
sym64_gen = find_symbol64(v64, orig);
|
|
|
|
if (sym64_gen == NULL) {
|
|
|
|
printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (fix == NULL) {
|
|
|
|
sym64_gen->st_name = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
sym64_fix = find_symbol64(v64, fix);
|
|
|
|
if (sym64_fix == NULL) {
|
|
|
|
printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
sym64_gen->st_value = sym64_fix->st_value;
|
|
|
|
sym64_gen->st_size = sym64_fix->st_size;
|
|
|
|
sym64_gen->st_info = sym64_fix->st_info;
|
|
|
|
sym64_gen->st_other = sym64_fix->st_other;
|
|
|
|
sym64_gen->st_shndx = sym64_fix->st_shndx;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#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
|
|
|
|
*/
|
|
|
|
|
2015-05-11 18:01:02 +08:00
|
|
|
#ifdef CONFIG_VDSO32
|
2005-11-11 18:15:21 +08:00
|
|
|
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;
|
2015-05-11 18:01:02 +08:00
|
|
|
#endif
|
2005-11-11 18:15:21 +08:00
|
|
|
|
|
|
|
#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)
|
|
|
|
{
|
2015-05-11 18:01:02 +08:00
|
|
|
#ifdef CONFIG_VDSO32
|
2005-11-11 18:15:21 +08:00
|
|
|
Elf32_Sym *sym32;
|
2015-05-11 18:01:02 +08:00
|
|
|
#endif
|
2005-11-11 18:15:21 +08:00
|
|
|
#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 */
|
|
|
|
|
2015-05-11 18:01:02 +08:00
|
|
|
#ifdef CONFIG_VDSO32
|
2005-11-11 18:15:21 +08:00
|
|
|
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);
|
2015-05-11 18:01:02 +08:00
|
|
|
#endif
|
2005-11-11 18:15:21 +08:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-10-20 09:47:18 +08:00
|
|
|
|
|
|
|
static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
|
|
|
|
struct lib64_elfinfo *v64)
|
|
|
|
{
|
2015-04-22 13:40:35 +08:00
|
|
|
unsigned long size;
|
|
|
|
void *start;
|
2006-10-20 09:47:18 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_PPC64
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section64(v64->hdr, "__ftr_fixup", &size);
|
|
|
|
if (start)
|
2006-10-20 09:47:18 +08:00
|
|
|
do_feature_fixups(cur_cpu_spec->cpu_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2006-10-20 09:47:18 +08:00
|
|
|
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
|
|
|
|
if (start)
|
2008-12-19 03:13:32 +08:00
|
|
|
do_feature_fixups(cur_cpu_spec->mmu_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2008-12-19 03:13:32 +08:00
|
|
|
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
|
|
|
|
if (start)
|
2006-10-20 09:47:18 +08:00
|
|
|
do_feature_fixups(powerpc_firmware_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2008-07-01 23:16:40 +08:00
|
|
|
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section64(v64->hdr, "__lwsync_fixup", &size);
|
|
|
|
if (start)
|
2008-07-01 23:16:40 +08:00
|
|
|
do_lwsync_fixups(cur_cpu_spec->cpu_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2006-10-20 09:47:18 +08:00
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
|
2015-05-11 18:01:02 +08:00
|
|
|
#ifdef CONFIG_VDSO32
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section32(v32->hdr, "__ftr_fixup", &size);
|
|
|
|
if (start)
|
2006-10-20 09:47:18 +08:00
|
|
|
do_feature_fixups(cur_cpu_spec->cpu_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2006-10-20 09:47:18 +08:00
|
|
|
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
|
|
|
|
if (start)
|
2008-12-19 03:13:32 +08:00
|
|
|
do_feature_fixups(cur_cpu_spec->mmu_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2008-12-19 03:13:32 +08:00
|
|
|
|
2006-10-20 09:47:18 +08:00
|
|
|
#ifdef CONFIG_PPC64
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
|
|
|
|
if (start)
|
2006-10-20 09:47:18 +08:00
|
|
|
do_feature_fixups(powerpc_firmware_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2006-10-20 09:47:18 +08:00
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
|
2015-04-22 13:40:35 +08:00
|
|
|
start = find_section32(v32->hdr, "__lwsync_fixup", &size);
|
|
|
|
if (start)
|
2008-07-01 23:16:40 +08:00
|
|
|
do_lwsync_fixups(cur_cpu_spec->cpu_features,
|
2015-04-22 13:40:35 +08:00
|
|
|
start, start + size);
|
2015-05-11 18:01:02 +08:00
|
|
|
#endif
|
2008-07-01 23:16:40 +08:00
|
|
|
|
2006-10-20 09:47:18 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-11-11 18:15:21 +08:00
|
|
|
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;
|
|
|
|
|
2006-10-20 09:47:18 +08:00
|
|
|
if (vdso_fixup_features(&v32, &v64))
|
|
|
|
return -1;
|
|
|
|
|
2005-11-11 18:15:21 +08:00
|
|
|
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;
|
|
|
|
|
|
|
|
|
2015-11-19 14:04:53 +08:00
|
|
|
for (i = 0; i < NR_syscalls; i++) {
|
2005-11-11 18:15:21 +08:00
|
|
|
#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 */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-07-05 04:37:11 +08:00
|
|
|
#ifdef CONFIG_PPC64
|
2013-06-25 03:30:09 +08:00
|
|
|
int vdso_getcpu_init(void)
|
2012-07-05 04:37:11 +08:00
|
|
|
{
|
|
|
|
unsigned long cpu, node, val;
|
|
|
|
|
|
|
|
/*
|
2014-03-11 06:29:38 +08:00
|
|
|
* SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
|
|
|
|
* in the next 16 bits. The VDSO uses this to implement getcpu().
|
2012-07-05 04:37:11 +08:00
|
|
|
*/
|
|
|
|
cpu = get_cpu();
|
|
|
|
WARN_ON_ONCE(cpu > 0xffff);
|
|
|
|
|
|
|
|
node = cpu_to_node(cpu);
|
|
|
|
WARN_ON_ONCE(node > 0xffff);
|
|
|
|
|
|
|
|
val = (cpu & 0xfff) | ((node & 0xffff) << 16);
|
2014-03-11 06:29:38 +08:00
|
|
|
mtspr(SPRN_SPRG_VDSO_WRITE, val);
|
|
|
|
get_paca()->sprg_vdso = val;
|
2012-07-05 04:37:11 +08:00
|
|
|
|
|
|
|
put_cpu();
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* We need to call this before SMP init */
|
|
|
|
early_initcall(vdso_getcpu_init);
|
|
|
|
#endif
|
2005-11-11 18:15:21 +08:00
|
|
|
|
2007-02-12 10:31:08 +08:00
|
|
|
static int __init vdso_init(void)
|
2005-11-11 18:15:21 +08:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC64
|
|
|
|
/*
|
2009-09-29 09:43:57 +08:00
|
|
|
* Fill up the "systemcfg" stuff for backward compatibility
|
2005-11-11 18:15:21 +08:00
|
|
|
*/
|
2007-05-16 23:12:16 +08:00
|
|
|
strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
|
2005-11-11 18:15:21 +08:00
|
|
|
vdso_data->version.major = SYSTEMCFG_MAJOR;
|
|
|
|
vdso_data->version.minor = SYSTEMCFG_MINOR;
|
|
|
|
vdso_data->processor = mfspr(SPRN_PVR);
|
2006-03-28 20:15:54 +08:00
|
|
|
/*
|
2012-03-22 02:23:27 +08:00
|
|
|
* Fake the old platform number for pSeries and add
|
2006-03-28 20:15:54 +08:00
|
|
|
* in LPAR bit if necessary
|
|
|
|
*/
|
2012-03-22 02:23:27 +08:00
|
|
|
vdso_data->platform = 0x100;
|
2006-03-28 20:15:54 +08:00
|
|
|
if (firmware_has_feature(FW_FEATURE_LPAR))
|
|
|
|
vdso_data->platform |= 1;
|
2010-07-12 12:36:09 +08:00
|
|
|
vdso_data->physicalMemorySize = memblock_phys_mem_size();
|
2005-11-11 18:15:21 +08:00
|
|
|
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;
|
|
|
|
|
2007-11-20 09:24:45 +08:00
|
|
|
/* XXXOJN: Blocks should be added to ppc64_caches and used instead */
|
|
|
|
vdso_data->dcache_block_size = ppc64_caches.dline_size;
|
|
|
|
vdso_data->icache_block_size = ppc64_caches.iline_size;
|
|
|
|
vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
|
|
|
|
vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
|
|
|
|
|
2005-11-11 18:15:21 +08:00
|
|
|
/*
|
|
|
|
* 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);
|
2007-11-20 09:24:45 +08:00
|
|
|
#else
|
|
|
|
vdso_data->dcache_block_size = L1_CACHE_BYTES;
|
|
|
|
vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
|
|
|
|
vdso_data->icache_block_size = L1_CACHE_BYTES;
|
|
|
|
vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
|
2005-11-11 18:15:21 +08:00
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
|
|
|
|
|
2015-05-11 18:01:02 +08:00
|
|
|
#ifdef CONFIG_VDSO32
|
|
|
|
vdso32_kbase = &vdso32_start;
|
|
|
|
|
2005-11-11 18:15:21 +08:00
|
|
|
/*
|
|
|
|
* 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);
|
2015-05-11 18:01:02 +08:00
|
|
|
#endif
|
2005-11-11 18:15:21 +08:00
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Setup the syscall map in the vDOS
|
|
|
|
*/
|
|
|
|
vdso_setup_syscall_map();
|
2006-10-20 09:47:18 +08:00
|
|
|
|
2005-11-11 18:15:21 +08:00
|
|
|
/*
|
|
|
|
* 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
|
2007-02-12 10:31:08 +08:00
|
|
|
return 0;
|
2005-11-11 18:15:21 +08:00
|
|
|
}
|
|
|
|
|
2015-05-11 18:01:02 +08:00
|
|
|
#ifdef CONFIG_VDSO32
|
2005-11-11 18:15:21 +08:00
|
|
|
/* Make sure pages are in the correct state */
|
2007-02-12 10:31:08 +08:00
|
|
|
vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
|
|
|
|
GFP_KERNEL);
|
|
|
|
BUG_ON(vdso32_pagelist == NULL);
|
2005-11-11 18:15:21 +08:00
|
|
|
for (i = 0; i < vdso32_pages; i++) {
|
|
|
|
struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
|
|
|
|
ClearPageReserved(pg);
|
|
|
|
get_page(pg);
|
2007-02-09 06:20:43 +08:00
|
|
|
vdso32_pagelist[i] = pg;
|
2005-11-11 18:15:21 +08:00
|
|
|
}
|
2007-02-09 06:20:43 +08:00
|
|
|
vdso32_pagelist[i++] = virt_to_page(vdso_data);
|
|
|
|
vdso32_pagelist[i] = NULL;
|
2015-05-11 18:01:02 +08:00
|
|
|
#endif
|
2007-02-09 06:20:43 +08:00
|
|
|
|
2005-11-11 18:15:21 +08:00
|
|
|
#ifdef CONFIG_PPC64
|
2007-02-12 10:31:08 +08:00
|
|
|
vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
|
|
|
|
GFP_KERNEL);
|
|
|
|
BUG_ON(vdso64_pagelist == NULL);
|
2005-11-11 18:15:21 +08:00
|
|
|
for (i = 0; i < vdso64_pages; i++) {
|
|
|
|
struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
|
|
|
|
ClearPageReserved(pg);
|
|
|
|
get_page(pg);
|
2007-02-09 06:20:43 +08:00
|
|
|
vdso64_pagelist[i] = pg;
|
2005-11-11 18:15:21 +08:00
|
|
|
}
|
2007-02-09 06:20:43 +08:00
|
|
|
vdso64_pagelist[i++] = virt_to_page(vdso_data);
|
|
|
|
vdso64_pagelist[i] = NULL;
|
2005-11-11 18:15:21 +08:00
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
|
|
|
|
get_page(virt_to_page(vdso_data));
|
2007-02-12 10:31:08 +08:00
|
|
|
|
|
|
|
smp_wmb();
|
|
|
|
vdso_ready = 1;
|
|
|
|
|
|
|
|
return 0;
|
2005-11-11 18:15:21 +08:00
|
|
|
}
|
2007-02-12 10:31:08 +08:00
|
|
|
arch_initcall(vdso_init);
|