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Diffstat (limited to 'arch/ppc64/kernel/vdso.c')
-rw-r--r--arch/ppc64/kernel/vdso.c625
1 files changed, 0 insertions, 625 deletions
diff --git a/arch/ppc64/kernel/vdso.c b/arch/ppc64/kernel/vdso.c
deleted file mode 100644
index 1bbacac4498..00000000000
--- a/arch/ppc64/kernel/vdso.c
+++ /dev/null
@@ -1,625 +0,0 @@
-/*
- * linux/arch/ppc64/kernel/vdso.c
- *
- * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
- * <benh@kernel.crashing.org>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/config.h>
-#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/smp_lock.h>
-#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/slab.h>
-#include <linux/user.h>
-#include <linux/elf.h>
-#include <linux/security.h>
-#include <linux/bootmem.h>
-
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/processor.h>
-#include <asm/mmu.h>
-#include <asm/mmu_context.h>
-#include <asm/machdep.h>
-#include <asm/cputable.h>
-#include <asm/sections.h>
-#include <asm/systemcfg.h>
-#include <asm/vdso.h>
-
-#undef DEBUG
-
-#ifdef DEBUG
-#define DBG(fmt...) printk(fmt)
-#else
-#define DBG(fmt...)
-#endif
-
-
-/*
- * The vDSOs themselves are here
- */
-extern char vdso64_start, vdso64_end;
-extern char vdso32_start, vdso32_end;
-
-static void *vdso64_kbase = &vdso64_start;
-static void *vdso32_kbase = &vdso32_start;
-
-unsigned int vdso64_pages;
-unsigned int vdso32_pages;
-
-/* Signal trampolines user addresses */
-
-unsigned long vdso64_rt_sigtramp;
-unsigned long vdso32_sigtramp;
-unsigned long vdso32_rt_sigtramp;
-
-/* Format of the patch table */
-struct vdso_patch_def
-{
- u32 pvr_mask, pvr_value;
- const char *gen_name;
- const char *fix_name;
-};
-
-/* Table of functions to patch based on the CPU type/revision
- *
- * TODO: Improve by adding whole lists for each entry
- */
-static struct vdso_patch_def vdso_patches[] = {
- {
- 0xffff0000, 0x003a0000, /* POWER5 */
- "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
- },
- {
- 0xffff0000, 0x003b0000, /* POWER5 */
- "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
- },
-};
-
-/*
- * Some infos carried around for each of them during parsing at
- * boot time.
- */
-struct lib32_elfinfo
-{
- Elf32_Ehdr *hdr; /* ptr to ELF */
- Elf32_Sym *dynsym; /* ptr to .dynsym section */
- unsigned long dynsymsize; /* size of .dynsym section */
- char *dynstr; /* ptr to .dynstr section */
- unsigned long text; /* offset of .text section in .so */
-};
-
-struct lib64_elfinfo
-{
- Elf64_Ehdr *hdr;
- Elf64_Sym *dynsym;
- unsigned long dynsymsize;
- char *dynstr;
- unsigned long text;
-};
-
-
-#ifdef __DEBUG
-static void dump_one_vdso_page(struct page *pg, struct page *upg)
-{
- printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
- page_count(pg),
- pg->flags);
- if (upg/* && pg != upg*/) {
- printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) << PAGE_SHIFT),
- page_count(upg),
- upg->flags);
- }
- printk("\n");
-}
-
-static void dump_vdso_pages(struct vm_area_struct * vma)
-{
- int i;
-
- if (!vma || test_thread_flag(TIF_32BIT)) {
- printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
- for (i=0; i<vdso32_pages; i++) {
- struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
- struct page *upg = (vma && vma->vm_mm) ?
- follow_page(vma->vm_mm, vma->vm_start + i*PAGE_SIZE, 0)
- : NULL;
- dump_one_vdso_page(pg, upg);
- }
- }
- if (!vma || !test_thread_flag(TIF_32BIT)) {
- printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
- for (i=0; i<vdso64_pages; i++) {
- struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
- struct page *upg = (vma && vma->vm_mm) ?
- follow_page(vma->vm_mm, vma->vm_start + i*PAGE_SIZE, 0)
- : NULL;
- dump_one_vdso_page(pg, upg);
- }
- }
-}
-#endif /* DEBUG */
-
-/*
- * Keep a dummy vma_close for now, it will prevent VMA merging.
- */
-static void vdso_vma_close(struct vm_area_struct * vma)
-{
-}
-
-/*
- * Our nopage() function, maps in the actual vDSO kernel pages, they will
- * be mapped read-only by do_no_page(), and eventually COW'ed, either
- * right away for an initial write access, or by do_wp_page().
- */
-static struct page * vdso_vma_nopage(struct vm_area_struct * vma,
- unsigned long address, int *type)
-{
- unsigned long offset = address - vma->vm_start;
- struct page *pg;
- void *vbase = test_thread_flag(TIF_32BIT) ? vdso32_kbase : vdso64_kbase;
-
- DBG("vdso_vma_nopage(current: %s, address: %016lx, off: %lx)\n",
- current->comm, address, offset);
-
- if (address < vma->vm_start || address > vma->vm_end)
- return NOPAGE_SIGBUS;
-
- /*
- * Last page is systemcfg.
- */
- if ((vma->vm_end - address) <= PAGE_SIZE)
- pg = virt_to_page(_systemcfg);
- else
- pg = virt_to_page(vbase + offset);
-
- get_page(pg);
- DBG(" ->page count: %d\n", page_count(pg));
-
- return pg;
-}
-
-static struct vm_operations_struct vdso_vmops = {
- .close = vdso_vma_close,
- .nopage = vdso_vma_nopage,
-};
-
-/*
- * 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 executable_stack)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
- unsigned long vdso_pages;
- unsigned long vdso_base;
-
- if (test_thread_flag(TIF_32BIT)) {
- vdso_pages = vdso32_pages;
- vdso_base = VDSO32_MBASE;
- } else {
- vdso_pages = vdso64_pages;
- vdso_base = VDSO64_MBASE;
- }
-
- current->thread.vdso_base = 0;
-
- /* vDSO has a problem and was disabled, just don't "enable" it for the
- * process
- */
- if (vdso_pages == 0)
- return 0;
-
- vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
- if (vma == NULL)
- return -ENOMEM;
-
- memset(vma, 0, sizeof(*vma));
-
- /*
- * 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.
- */
- vdso_base = get_unmapped_area(NULL, vdso_base,
- vdso_pages << PAGE_SHIFT, 0, 0);
- if (vdso_base & ~PAGE_MASK) {
- kmem_cache_free(vm_area_cachep, vma);
- return (int)vdso_base;
- }
-
- current->thread.vdso_base = vdso_base;
-
- vma->vm_mm = mm;
- vma->vm_start = current->thread.vdso_base;
-
- /*
- * the VMA size is one page more than the vDSO since systemcfg
- * is mapped in the last one
- */
- vma->vm_end = vma->vm_start + ((vdso_pages + 1) << PAGE_SHIFT);
-
- /*
- * 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
- */
- vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | VM_RESERVED;
- vma->vm_flags |= mm->def_flags;
- vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
- vma->vm_ops = &vdso_vmops;
-
- down_write(&mm->mmap_sem);
- if (insert_vm_struct(mm, vma)) {
- up_write(&mm->mmap_sem);
- kmem_cache_free(vm_area_cachep, vma);
- return -ENOMEM;
- }
- mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
- up_write(&mm->mmap_sem);
-
- return 0;
-}
-
-static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
- unsigned long *size)
-{
- Elf32_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;
- }
- }
- *size = 0;
- return NULL;
-}
-
-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 Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, const char *symname)
-{
- unsigned int i;
- char name[32], *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, 32);
- c = strchr(name, '@');
- if (c)
- *c = 0;
- if (strcmp(symname, name) == 0)
- return &lib->dynsym[i];
- }
- return NULL;
-}
-
-static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, const char *symname)
-{
- unsigned int i;
- char name[32], *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, 32);
- 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;
-}
-
-/* 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
-}
-
-
-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: a required symbol section was 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;
-
- 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: a required symbol section was 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;
-
- return 0;
-}
-
-static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
- struct lib64_elfinfo *v64)
-{
- /*
- * Find signal trampolines
- */
-
- vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
- 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;
- Elf64_Sym *sym64;
-
- 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);
-
- 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);
-
- return 0;
-}
-
-static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
- struct lib64_elfinfo *v64,
- const char *orig, const char *fix)
-{
- 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;
- }
- 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;
-}
-
-static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
- struct lib64_elfinfo *v64,
- const char *orig, const char *fix)
-{
- 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;
- }
- 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;
-}
-
-static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
- struct lib64_elfinfo *v64)
-{
- u32 pvr;
- int i;
-
- pvr = mfspr(SPRN_PVR);
- for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
- struct vdso_patch_def *patch = &vdso_patches[i];
- int match = (pvr & patch->pvr_mask) == patch->pvr_value;
-
- DBG("patch %d (mask: %x, pvr: %x) : %s\n",
- i, patch->pvr_mask, patch->pvr_value, match ? "match" : "skip");
-
- if (!match)
- continue;
-
- DBG("replacing %s with %s...\n", patch->gen_name, 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);
- vdso_do_func_patch64(v32, v64, patch->gen_name, patch->fix_name);
- }
-
- return 0;
-}
-
-
-static __init int vdso_setup(void)
-{
- struct lib32_elfinfo v32;
- struct lib64_elfinfo v64;
-
- v32.hdr = vdso32_kbase;
- v64.hdr = vdso64_kbase;
-
- 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;
-}
-
-void __init vdso_init(void)
-{
- int i;
-
- vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
- vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
-
- DBG("vdso64_kbase: %p, 0x%x pages, vdso32_kbase: %p, 0x%x pages\n",
- vdso64_kbase, vdso64_pages, vdso32_kbase, vdso32_pages);
-
- /*
- * 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");
- /* XXX should free pages here ? */
- vdso64_pages = vdso32_pages = 0;
- return;
- }
-
- /* Make sure pages are in the correct state */
- for (i = 0; i < vdso64_pages; i++) {
- struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
- ClearPageReserved(pg);
- get_page(pg);
- }
- for (i = 0; i < vdso32_pages; i++) {
- struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
- ClearPageReserved(pg);
- get_page(pg);
- }
-
- get_page(virt_to_page(_systemcfg));
-}
-
-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;
-}
-