2015-05-24 15:28:17 +00:00
|
|
|
/*-
|
|
|
|
* Copyright (c) 2013 Dmitry Chagin
|
|
|
|
* All rights reserved.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer
|
|
|
|
* in this position and unchanged.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
|
|
|
|
#include "opt_compat.h"
|
|
|
|
|
2015-05-24 15:45:36 +00:00
|
|
|
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
|
2015-05-24 15:28:17 +00:00
|
|
|
#define __ELF_WORD_SIZE 32
|
2015-05-24 15:45:36 +00:00
|
|
|
#else
|
|
|
|
#define __ELF_WORD_SIZE 64
|
|
|
|
#endif
|
2015-05-24 15:28:17 +00:00
|
|
|
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <sys/systm.h>
|
|
|
|
#include <sys/elf.h>
|
|
|
|
#include <sys/kernel.h>
|
|
|
|
#include <sys/lock.h>
|
|
|
|
#include <sys/rwlock.h>
|
|
|
|
#include <sys/queue.h>
|
|
|
|
#include <sys/sysent.h>
|
|
|
|
|
|
|
|
#include <vm/vm.h>
|
|
|
|
#include <vm/vm_param.h>
|
|
|
|
#include <vm/pmap.h>
|
|
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include <vm/vm_kern.h>
|
|
|
|
#include <vm/vm_map.h>
|
|
|
|
#include <vm/vm_object.h>
|
|
|
|
#include <vm/vm_page.h>
|
|
|
|
#include <vm/vm_pager.h>
|
|
|
|
|
|
|
|
#include <compat/linux/linux_vdso.h>
|
|
|
|
|
|
|
|
SLIST_HEAD(, linux_vdso_sym) __elfN(linux_vdso_syms) =
|
|
|
|
SLIST_HEAD_INITIALIZER(__elfN(linux_vdso_syms));
|
|
|
|
|
|
|
|
static int __elfN(symtabindex);
|
|
|
|
static int __elfN(symstrindex);
|
|
|
|
|
|
|
|
static void
|
|
|
|
__elfN(linux_vdso_lookup)(Elf_Ehdr *, struct linux_vdso_sym *);
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
__elfN(linux_vdso_sym_init)(struct linux_vdso_sym *s)
|
|
|
|
{
|
|
|
|
|
|
|
|
SLIST_INSERT_HEAD(&__elfN(linux_vdso_syms), s, sym);
|
|
|
|
}
|
|
|
|
|
|
|
|
vm_object_t
|
|
|
|
__elfN(linux_shared_page_init)(char **mapping)
|
|
|
|
{
|
|
|
|
vm_page_t m;
|
|
|
|
vm_object_t obj;
|
|
|
|
vm_offset_t addr;
|
|
|
|
|
|
|
|
obj = vm_pager_allocate(OBJT_PHYS, 0, PAGE_SIZE,
|
|
|
|
VM_PROT_DEFAULT, 0, NULL);
|
|
|
|
VM_OBJECT_WLOCK(obj);
|
|
|
|
m = vm_page_grab(obj, 0, VM_ALLOC_NOBUSY | VM_ALLOC_ZERO);
|
|
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
|
|
VM_OBJECT_WUNLOCK(obj);
|
|
|
|
addr = kva_alloc(PAGE_SIZE);
|
|
|
|
pmap_qenter(addr, &m, 1);
|
|
|
|
*mapping = (char *)addr;
|
|
|
|
return (obj);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
__elfN(linux_shared_page_fini)(vm_object_t obj)
|
|
|
|
{
|
|
|
|
|
|
|
|
vm_object_deallocate(obj);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
__elfN(linux_vdso_fixup)(struct sysentvec *sv)
|
|
|
|
{
|
|
|
|
Elf_Ehdr *ehdr;
|
|
|
|
Elf_Shdr *shdr;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
ehdr = (Elf_Ehdr *) sv->sv_sigcode;
|
|
|
|
|
|
|
|
if (!IS_ELF(*ehdr) ||
|
|
|
|
ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
|
|
|
|
ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
|
|
|
|
ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
|
|
|
|
ehdr->e_shoff == 0 ||
|
|
|
|
ehdr->e_shentsize != sizeof(Elf_Shdr))
|
|
|
|
panic("Linux invalid vdso header.\n");
|
|
|
|
|
|
|
|
if (ehdr->e_type != ET_DYN)
|
|
|
|
panic("Linux invalid vdso header.\n");
|
|
|
|
|
|
|
|
shdr = (Elf_Shdr *) ((caddr_t)ehdr + ehdr->e_shoff);
|
|
|
|
|
|
|
|
__elfN(symtabindex) = -1;
|
|
|
|
__elfN(symstrindex) = -1;
|
|
|
|
for (i = 0; i < ehdr->e_shnum; i++) {
|
|
|
|
if (shdr[i].sh_size == 0)
|
|
|
|
continue;
|
|
|
|
if (shdr[i].sh_type == SHT_DYNSYM) {
|
|
|
|
__elfN(symtabindex) = i;
|
|
|
|
__elfN(symstrindex) = shdr[i].sh_link;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (__elfN(symtabindex) == -1 || __elfN(symstrindex) == -1)
|
|
|
|
panic("Linux invalid vdso header.\n");
|
|
|
|
|
|
|
|
ehdr->e_ident[EI_OSABI] = ELFOSABI_LINUX;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2017-07-30 21:24:20 +00:00
|
|
|
__elfN(linux_vdso_reloc)(struct sysentvec *sv)
|
2015-05-24 15:28:17 +00:00
|
|
|
{
|
|
|
|
struct linux_vdso_sym *lsym;
|
|
|
|
Elf_Ehdr *ehdr;
|
|
|
|
Elf_Phdr *phdr;
|
|
|
|
Elf_Shdr *shdr;
|
|
|
|
Elf_Dyn *dyn;
|
|
|
|
Elf_Sym *sym;
|
2017-03-14 18:29:23 +00:00
|
|
|
int i, j, symcnt;
|
2015-05-24 15:28:17 +00:00
|
|
|
|
|
|
|
ehdr = (Elf_Ehdr *) sv->sv_sigcode;
|
|
|
|
|
|
|
|
/* Adjust our so relative to the sigcode_base */
|
2017-07-30 21:24:20 +00:00
|
|
|
if (sv->sv_shared_page_base != 0) {
|
|
|
|
ehdr->e_entry += sv->sv_shared_page_base;
|
2015-05-24 15:28:17 +00:00
|
|
|
phdr = (Elf_Phdr *)((caddr_t)ehdr + ehdr->e_phoff);
|
|
|
|
|
|
|
|
/* phdrs */
|
|
|
|
for (i = 0; i < ehdr->e_phnum; i++) {
|
2017-07-30 21:24:20 +00:00
|
|
|
phdr[i].p_vaddr += sv->sv_shared_page_base;
|
2015-05-24 15:28:17 +00:00
|
|
|
if (phdr[i].p_type != PT_DYNAMIC)
|
|
|
|
continue;
|
|
|
|
dyn = (Elf_Dyn *)((caddr_t)ehdr + phdr[i].p_offset);
|
|
|
|
for(; dyn->d_tag != DT_NULL; dyn++) {
|
|
|
|
switch (dyn->d_tag) {
|
|
|
|
case DT_PLTGOT:
|
|
|
|
case DT_HASH:
|
|
|
|
case DT_STRTAB:
|
|
|
|
case DT_SYMTAB:
|
|
|
|
case DT_RELA:
|
|
|
|
case DT_INIT:
|
|
|
|
case DT_FINI:
|
|
|
|
case DT_REL:
|
|
|
|
case DT_DEBUG:
|
|
|
|
case DT_JMPREL:
|
|
|
|
case DT_VERSYM:
|
|
|
|
case DT_VERDEF:
|
|
|
|
case DT_VERNEED:
|
|
|
|
case DT_ADDRRNGLO ... DT_ADDRRNGHI:
|
2017-07-30 21:24:20 +00:00
|
|
|
dyn->d_un.d_ptr += sv->sv_shared_page_base;
|
2015-05-24 15:28:17 +00:00
|
|
|
break;
|
|
|
|
case DT_ENCODING ... DT_LOOS-1:
|
|
|
|
case DT_LOOS ... DT_HIOS:
|
|
|
|
if (dyn->d_tag >= DT_ENCODING &&
|
|
|
|
(dyn->d_tag & 1) == 0)
|
2017-07-30 21:24:20 +00:00
|
|
|
dyn->d_un.d_ptr += sv->sv_shared_page_base;
|
2015-05-24 15:28:17 +00:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* sections */
|
|
|
|
shdr = (Elf_Shdr *)((caddr_t)ehdr + ehdr->e_shoff);
|
|
|
|
for(i = 0; i < ehdr->e_shnum; i++) {
|
|
|
|
if (!(shdr[i].sh_flags & SHF_ALLOC))
|
|
|
|
continue;
|
2017-07-30 21:24:20 +00:00
|
|
|
shdr[i].sh_addr += sv->sv_shared_page_base;
|
2015-05-24 15:28:17 +00:00
|
|
|
if (shdr[i].sh_type != SHT_SYMTAB &&
|
|
|
|
shdr[i].sh_type != SHT_DYNSYM)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
sym = (Elf_Sym *)((caddr_t)ehdr + shdr[i].sh_offset);
|
|
|
|
symcnt = shdr[i].sh_size / sizeof(*sym);
|
|
|
|
|
2017-03-14 18:29:23 +00:00
|
|
|
for(j = 0; j < symcnt; j++, sym++) {
|
2015-05-24 15:28:17 +00:00
|
|
|
if (sym->st_shndx == SHN_UNDEF ||
|
|
|
|
sym->st_shndx == SHN_ABS)
|
|
|
|
continue;
|
2017-07-30 21:24:20 +00:00
|
|
|
sym->st_value += sv->sv_shared_page_base;
|
2015-05-24 15:28:17 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
SLIST_FOREACH(lsym, &__elfN(linux_vdso_syms), sym)
|
|
|
|
__elfN(linux_vdso_lookup)(ehdr, lsym);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
__elfN(linux_vdso_lookup)(Elf_Ehdr *ehdr, struct linux_vdso_sym *vsym)
|
|
|
|
{
|
|
|
|
vm_offset_t strtab, symname;
|
|
|
|
uint32_t symcnt;
|
|
|
|
Elf_Shdr *shdr;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
shdr = (Elf_Shdr *) ((caddr_t)ehdr + ehdr->e_shoff);
|
|
|
|
|
|
|
|
strtab = (vm_offset_t)((caddr_t)ehdr +
|
|
|
|
shdr[__elfN(symstrindex)].sh_offset);
|
|
|
|
Elf_Sym *sym = (Elf_Sym *)((caddr_t)ehdr +
|
|
|
|
shdr[__elfN(symtabindex)].sh_offset);
|
|
|
|
symcnt = shdr[__elfN(symtabindex)].sh_size / sizeof(*sym);
|
|
|
|
|
|
|
|
for (i = 0; i < symcnt; ++i, ++sym) {
|
|
|
|
symname = strtab + sym->st_name;
|
|
|
|
if (strncmp(vsym->symname, (char *)symname, vsym->size) == 0) {
|
|
|
|
*vsym->ptr = (uintptr_t)sym->st_value;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|