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kernel-ark/arch/um/kernel/tlb.c
Bodo Stroesser 07bf731e4b [PATCH] uml: skas0 stubs now check system call return values 
Change syscall-stub's data to include a "expected retval".

Stub now checks syscalls retval and aborts execution of syscall list, if
retval != expected retval.

run_syscall_stub prints the data of the failed syscall, using the data pointer
and retval written by the stub to the beginning of the stack.

one_syscall_stub is removed, to simplify code, because only some instructions
are saved by one_syscall_stub, no host-syscall.

Using the stub with additional data (modify_ldt via stub)
is prepared also.

Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-05 00:06:24 -07:00

391 lines
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/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/mm.h"
#include "asm/page.h"
#include "asm/pgalloc.h"
#include "asm/tlbflush.h"
#include "choose-mode.h"
#include "mode_kern.h"
#include "user_util.h"
#include "tlb.h"
#include "mem.h"
#include "mem_user.h"
#include "os.h"
static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
int r, int w, int x, struct host_vm_op *ops, int *index,
int last_filled, union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
__u64 offset;
struct host_vm_op *last;
int fd, ret = 0;
fd = phys_mapping(phys, &offset);
if(*index != -1){
last = &ops[*index];
if((last->type == MMAP) &&
(last->u.mmap.addr + last->u.mmap.len == virt) &&
(last->u.mmap.r == r) && (last->u.mmap.w == w) &&
(last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
(last->u.mmap.offset + last->u.mmap.len == offset)){
last->u.mmap.len += len;
return 0;
}
}
if(*index == last_filled){
ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
*index = -1;
}
ops[++*index] = ((struct host_vm_op) { .type = MMAP,
.u = { .mmap = {
.addr = virt,
.len = len,
.r = r,
.w = w,
.x = x,
.fd = fd,
.offset = offset }
} });
return ret;
}
static int add_munmap(unsigned long addr, unsigned long len,
struct host_vm_op *ops, int *index, int last_filled,
union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
struct host_vm_op *last;
int ret = 0;
if(*index != -1){
last = &ops[*index];
if((last->type == MUNMAP) &&
(last->u.munmap.addr + last->u.mmap.len == addr)){
last->u.munmap.len += len;
return 0;
}
}
if(*index == last_filled){
ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
*index = -1;
}
ops[++*index] = ((struct host_vm_op) { .type = MUNMAP,
.u = { .munmap = {
.addr = addr,
.len = len } } });
return ret;
}
static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
int x, struct host_vm_op *ops, int *index,
int last_filled, union mm_context *mmu, void **flush,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
struct host_vm_op *last;
int ret = 0;
if(*index != -1){
last = &ops[*index];
if((last->type == MPROTECT) &&
(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
(last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
(last->u.mprotect.x == x)){
last->u.mprotect.len += len;
return 0;
}
}
if(*index == last_filled){
ret = (*do_ops)(mmu, ops, last_filled, 0, flush);
*index = -1;
}
ops[++*index] = ((struct host_vm_op) { .type = MPROTECT,
.u = { .mprotect = {
.addr = addr,
.len = len,
.r = r,
.w = w,
.x = x } } });
return ret;
}
#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force,
int (*do_ops)(union mm_context *, struct host_vm_op *,
int, int, void **))
{
pgd_t *npgd;
pud_t *npud;
pmd_t *npmd;
pte_t *npte;
union mm_context *mmu = &mm->context;
unsigned long addr, end;
int r, w, x;
struct host_vm_op ops[1];
void *flush = NULL;
int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
int ret = 0;
if(mm == NULL) return;
ops[0].type = NONE;
for(addr = start_addr; addr < end_addr && !ret;){
npgd = pgd_offset(mm, addr);
if(!pgd_present(*npgd)){
end = ADD_ROUND(addr, PGDIR_SIZE);
if(end > end_addr)
end = end_addr;
if(force || pgd_newpage(*npgd)){
ret = add_munmap(addr, end - addr, ops,
&op_index, last_op, mmu,
&flush, do_ops);
pgd_mkuptodate(*npgd);
}
addr = end;
continue;
}
npud = pud_offset(npgd, addr);
if(!pud_present(*npud)){
end = ADD_ROUND(addr, PUD_SIZE);
if(end > end_addr)
end = end_addr;
if(force || pud_newpage(*npud)){
ret = add_munmap(addr, end - addr, ops,
&op_index, last_op, mmu,
&flush, do_ops);
pud_mkuptodate(*npud);
}
addr = end;
continue;
}
npmd = pmd_offset(npud, addr);
if(!pmd_present(*npmd)){
end = ADD_ROUND(addr, PMD_SIZE);
if(end > end_addr)
end = end_addr;
if(force || pmd_newpage(*npmd)){
ret = add_munmap(addr, end - addr, ops,
&op_index, last_op, mmu,
&flush, do_ops);
pmd_mkuptodate(*npmd);
}
addr = end;
continue;
}
npte = pte_offset_kernel(npmd, addr);
r = pte_read(*npte);
w = pte_write(*npte);
x = pte_exec(*npte);
if(!pte_dirty(*npte))
w = 0;
if(!pte_young(*npte)){
r = 0;
w = 0;
}
if(force || pte_newpage(*npte)){
if(pte_present(*npte))
ret = add_mmap(addr,
pte_val(*npte) & PAGE_MASK,
PAGE_SIZE, r, w, x, ops,
&op_index, last_op, mmu,
&flush, do_ops);
else ret = add_munmap(addr, PAGE_SIZE, ops,
&op_index, last_op, mmu,
&flush, do_ops);
}
else if(pte_newprot(*npte))
ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
&op_index, last_op, mmu,
&flush, do_ops);
*npte = pte_mkuptodate(*npte);
addr += PAGE_SIZE;
}
if(!ret)
ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
/* This is not an else because ret is modified above */
if(ret) {
printk("fix_range_common: failed, killing current process\n");
force_sig(SIGKILL, current);
}
}
int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
{
struct mm_struct *mm;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long addr, last;
int updated = 0, err;
mm = &init_mm;
for(addr = start; addr < end;){
pgd = pgd_offset(mm, addr);
if(!pgd_present(*pgd)){
last = ADD_ROUND(addr, PGDIR_SIZE);
if(last > end)
last = end;
if(pgd_newpage(*pgd)){
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr = last;
continue;
}
pud = pud_offset(pgd, addr);
if(!pud_present(*pud)){
last = ADD_ROUND(addr, PUD_SIZE);
if(last > end)
last = end;
if(pud_newpage(*pud)){
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr = last;
continue;
}
pmd = pmd_offset(pud, addr);
if(!pmd_present(*pmd)){
last = ADD_ROUND(addr, PMD_SIZE);
if(last > end)
last = end;
if(pmd_newpage(*pmd)){
updated = 1;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr = last;
continue;
}
pte = pte_offset_kernel(pmd, addr);
if(!pte_present(*pte) || pte_newpage(*pte)){
updated = 1;
err = os_unmap_memory((void *) addr,
PAGE_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
if(pte_present(*pte))
map_memory(addr,
pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 1, 1, 1);
}
else if(pte_newprot(*pte)){
updated = 1;
protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
}
addr += PAGE_SIZE;
}
return(updated);
}
pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
{
return(pgd_offset(mm, address));
}
pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
{
return(pud_offset(pgd, address));
}
pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
{
return(pmd_offset(pud, address));
}
pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
{
return(pte_offset_kernel(pmd, address));
}
pte_t *addr_pte(struct task_struct *task, unsigned long addr)
{
pgd_t *pgd = pgd_offset(task->mm, addr);
pud_t *pud = pud_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
return(pte_offset_map(pmd, addr));
}
void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
{
address &= PAGE_MASK;
flush_tlb_range(vma, address, address + PAGE_SIZE);
}
void flush_tlb_all(void)
{
flush_tlb_mm(current->mm);
}
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
flush_tlb_kernel_range_common, start, end);
}
void flush_tlb_kernel_vm(void)
{
CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
flush_tlb_kernel_range_common(start_vm, end_vm));
}
void __flush_tlb_one(unsigned long addr)
{
CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
}
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
end);
}
void flush_tlb_mm(struct mm_struct *mm)
{
CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
}
void force_flush_all(void)
{
CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
}
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