/*
- * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include "linux/sched.h"
-#include "linux/slab.h"
-#include "linux/types.h"
-#include "linux/errno.h"
-#include "linux/spinlock.h"
-#include "asm/uaccess.h"
-#include "asm/smp.h"
-#include "asm/ldt.h"
-#include "asm/unistd.h"
-#include "choose-mode.h"
-#include "kern.h"
-#include "mode_kern.h"
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/unistd.h>
#include "os.h"
-
-extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
-
-#ifdef CONFIG_MODE_TT
-
-static long do_modify_ldt_tt(int func, void __user *ptr,
- unsigned long bytecount)
-{
- struct user_desc info;
- int res = 0;
- void *buf = NULL;
- void *p = NULL; /* What we pass to host. */
-
- switch(func){
- case 1:
- case 0x11: /* write_ldt */
- /* Do this check now to avoid overflows. */
- if (bytecount != sizeof(struct user_desc)) {
- res = -EINVAL;
- goto out;
- }
-
- if(copy_from_user(&info, ptr, sizeof(info))) {
- res = -EFAULT;
- goto out;
- }
-
- p = &info;
- break;
- case 0:
- case 2: /* read_ldt */
-
- /* The use of info avoids kmalloc on the write case, not on the
- * read one. */
- buf = kmalloc(bytecount, GFP_KERNEL);
- if (!buf) {
- res = -ENOMEM;
- goto out;
- }
- p = buf;
- break;
- default:
- res = -ENOSYS;
- goto out;
- }
-
- res = modify_ldt(func, p, bytecount);
- if(res < 0)
- goto out;
-
- switch(func){
- case 0:
- case 2:
- /* Modify_ldt was for reading and returned the number of read
- * bytes.*/
- if(copy_to_user(ptr, p, res))
- res = -EFAULT;
- break;
- }
-
-out:
- kfree(buf);
- return res;
-}
-
-#endif
-
-#ifdef CONFIG_MODE_SKAS
-
+#include "proc_mm.h"
#include "skas.h"
#include "skas_ptrace.h"
-#include "asm/mmu_context.h"
-#include "proc_mm.h"
+#include "sysdep/tls.h"
+
+extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
-long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
- void **addr, int done)
+static long write_ldt_entry(struct mm_id *mm_idp, int func,
+ struct user_desc *desc, void **addr, int done)
{
long res;
- if(proc_mm){
- /* This is a special handling for the case, that the mm to
+ if (proc_mm) {
+ /*
+ * This is a special handling for the case, that the mm to
* modify isn't current->active_mm.
* If this is called directly by modify_ldt,
* (current->active_mm->context.skas.u == mm_idp)
- * will be true. So no call to switch_mm_skas(mm_idp) is done.
+ * will be true. So no call to __switch_mm(mm_idp) is done.
* If this is called in case of init_new_ldt or PTRACE_LDT,
* mm_idp won't belong to current->active_mm, but child->mm.
* So we need to switch child's mm into our userspace, then
*
* Note: I'm unsure: should interrupts be disabled here?
*/
- if(!current->active_mm || current->active_mm == &init_mm ||
- mm_idp != ¤t->active_mm->context.skas.id)
- switch_mm_skas(mm_idp);
+ if (!current->active_mm || current->active_mm == &init_mm ||
+ mm_idp != ¤t->active_mm->context.id)
+ __switch_mm(mm_idp);
}
- if(ptrace_ldt) {
+ if (ptrace_ldt) {
struct ptrace_ldt ldt_op = (struct ptrace_ldt) {
.func = func,
.ptr = desc,
u32 cpu;
int pid;
- if(!proc_mm)
+ if (!proc_mm)
pid = mm_idp->u.pid;
else {
cpu = get_cpu();
res = os_ptrace_ldt(pid, 0, (unsigned long) &ldt_op);
- if(proc_mm)
+ if (proc_mm)
put_cpu();
}
else {
(sizeof(*desc) + sizeof(long) - 1) &
~(sizeof(long) - 1),
addr, &stub_addr);
- if(!res){
+ if (!res) {
unsigned long args[] = { func,
(unsigned long)stub_addr,
sizeof(*desc),
}
}
- if(proc_mm){
- /* This is the second part of special handling, that makes
+ if (proc_mm) {
+ /*
+ * This is the second part of special handling, that makes
* PTRACE_LDT possible to implement.
*/
- if(current->active_mm && current->active_mm != &init_mm &&
- mm_idp != ¤t->active_mm->context.skas.id)
- switch_mm_skas(¤t->active_mm->context.skas.id);
+ if (current->active_mm && current->active_mm != &init_mm &&
+ mm_idp != ¤t->active_mm->context.id)
+ __switch_mm(¤t->active_mm->context.id);
}
return res;
.ptr = kmalloc(bytecount, GFP_KERNEL)};
u32 cpu;
- if(ptrace_ldt.ptr == NULL)
+ if (ptrace_ldt.ptr == NULL)
return -ENOMEM;
- /* This is called from sys_modify_ldt only, so userspace_pid gives
+ /*
+ * This is called from sys_modify_ldt only, so userspace_pid gives
* us the right number
*/
cpu = get_cpu();
res = os_ptrace_ldt(userspace_pid[cpu], 0, (unsigned long) &ptrace_ldt);
put_cpu();
- if(res < 0)
+ if (res < 0)
goto out;
n = copy_to_user(ptr, ptrace_ldt.ptr, res);
- if(n != 0)
+ if (n != 0)
res = -EFAULT;
out:
{
int i, err = 0;
unsigned long size;
- uml_ldt_t * ldt = ¤t->mm->context.skas.ldt;
+ uml_ldt_t * ldt = ¤t->mm->context.ldt;
- if(!ldt->entry_count)
+ if (!ldt->entry_count)
goto out;
- if(bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
+ if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
err = bytecount;
- if(ptrace_ldt){
+ if (ptrace_ldt)
return read_ldt_from_host(ptr, bytecount);
- }
- down(&ldt->semaphore);
- if(ldt->entry_count <= LDT_DIRECT_ENTRIES){
+ mutex_lock(&ldt->lock);
+ if (ldt->entry_count <= LDT_DIRECT_ENTRIES) {
size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES;
- if(size > bytecount)
+ if (size > bytecount)
size = bytecount;
- if(copy_to_user(ptr, ldt->u.entries, size))
+ if (copy_to_user(ptr, ldt->u.entries, size))
err = -EFAULT;
bytecount -= size;
ptr += size;
}
else {
- for(i=0; i<ldt->entry_count/LDT_ENTRIES_PER_PAGE && bytecount;
- i++){
+ for (i=0; i<ldt->entry_count/LDT_ENTRIES_PER_PAGE && bytecount;
+ i++) {
size = PAGE_SIZE;
- if(size > bytecount)
+ if (size > bytecount)
size = bytecount;
- if(copy_to_user(ptr, ldt->u.pages[i], size)){
+ if (copy_to_user(ptr, ldt->u.pages[i], size)) {
err = -EFAULT;
break;
}
ptr += size;
}
}
- up(&ldt->semaphore);
+ mutex_unlock(&ldt->lock);
- if(bytecount == 0 || err == -EFAULT)
+ if (bytecount == 0 || err == -EFAULT)
goto out;
- if(clear_user(ptr, bytecount))
+ if (clear_user(ptr, bytecount))
err = -EFAULT;
out:
{
int err;
- if(bytecount > 5*LDT_ENTRY_SIZE)
+ if (bytecount > 5*LDT_ENTRY_SIZE)
bytecount = 5*LDT_ENTRY_SIZE;
err = bytecount;
- /* UML doesn't support lcall7 and lcall27.
+ /*
+ * UML doesn't support lcall7 and lcall27.
* So, we don't really have a default ldt, but emulate
* an empty ldt of common host default ldt size.
*/
- if(clear_user(ptr, bytecount))
+ if (clear_user(ptr, bytecount))
err = -EFAULT;
return err;
static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
{
- uml_ldt_t * ldt = ¤t->mm->context.skas.ldt;
- struct mm_id * mm_idp = ¤t->mm->context.skas.id;
+ uml_ldt_t * ldt = ¤t->mm->context.ldt;
+ struct mm_id * mm_idp = ¤t->mm->context.id;
int i, err;
struct user_desc ldt_info;
struct ldt_entry entry0, *ldt_p;
void *addr = NULL;
err = -EINVAL;
- if(bytecount != sizeof(ldt_info))
+ if (bytecount != sizeof(ldt_info))
goto out;
err = -EFAULT;
- if(copy_from_user(&ldt_info, ptr, sizeof(ldt_info)))
+ if (copy_from_user(&ldt_info, ptr, sizeof(ldt_info)))
goto out;
err = -EINVAL;
- if(ldt_info.entry_number >= LDT_ENTRIES)
+ if (ldt_info.entry_number >= LDT_ENTRIES)
goto out;
- if(ldt_info.contents == 3){
+ if (ldt_info.contents == 3) {
if (func == 1)
goto out;
if (ldt_info.seg_not_present == 0)
goto out;
}
- if(!ptrace_ldt)
- down(&ldt->semaphore);
+ if (!ptrace_ldt)
+ mutex_lock(&ldt->lock);
err = write_ldt_entry(mm_idp, func, &ldt_info, &addr, 1);
- if(err)
+ if (err)
goto out_unlock;
- else if(ptrace_ldt) {
- /* With PTRACE_LDT available, this is used as a flag only */
- ldt->entry_count = 1;
- goto out;
- }
-
- if(ldt_info.entry_number >= ldt->entry_count &&
- ldt_info.entry_number >= LDT_DIRECT_ENTRIES){
- for(i=ldt->entry_count/LDT_ENTRIES_PER_PAGE;
- i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
- i++){
- if(i == 0)
+ else if (ptrace_ldt) {
+ /* With PTRACE_LDT available, this is used as a flag only */
+ ldt->entry_count = 1;
+ goto out;
+ }
+
+ if (ldt_info.entry_number >= ldt->entry_count &&
+ ldt_info.entry_number >= LDT_DIRECT_ENTRIES) {
+ for (i=ldt->entry_count/LDT_ENTRIES_PER_PAGE;
+ i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
+ i++) {
+ if (i == 0)
memcpy(&entry0, ldt->u.entries,
sizeof(entry0));
ldt->u.pages[i] = (struct ldt_entry *)
__get_free_page(GFP_KERNEL|__GFP_ZERO);
- if(!ldt->u.pages[i]){
+ if (!ldt->u.pages[i]) {
err = -ENOMEM;
/* Undo the change in host */
memset(&ldt_info, 0, sizeof(ldt_info));
write_ldt_entry(mm_idp, 1, &ldt_info, &addr, 1);
goto out_unlock;
}
- if(i == 0) {
+ if (i == 0) {
memcpy(ldt->u.pages[0], &entry0,
sizeof(entry0));
memcpy(ldt->u.pages[0]+1, ldt->u.entries+1,
ldt->entry_count = (i + 1) * LDT_ENTRIES_PER_PAGE;
}
}
- if(ldt->entry_count <= ldt_info.entry_number)
+ if (ldt->entry_count <= ldt_info.entry_number)
ldt->entry_count = ldt_info.entry_number + 1;
- if(ldt->entry_count <= LDT_DIRECT_ENTRIES)
+ if (ldt->entry_count <= LDT_DIRECT_ENTRIES)
ldt_p = ldt->u.entries + ldt_info.entry_number;
else
ldt_p = ldt->u.pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] +
ldt_info.entry_number%LDT_ENTRIES_PER_PAGE;
- if(ldt_info.base_addr == 0 && ldt_info.limit == 0 &&
- (func == 1 || LDT_empty(&ldt_info))){
+ if (ldt_info.base_addr == 0 && ldt_info.limit == 0 &&
+ (func == 1 || LDT_empty(&ldt_info))) {
ldt_p->a = 0;
ldt_p->b = 0;
}
err = 0;
out_unlock:
- up(&ldt->semaphore);
+ mutex_unlock(&ldt->lock);
out:
return err;
}
spin_lock(&host_ldt_lock);
- if(host_ldt_entries != NULL){
+ if (host_ldt_entries != NULL) {
spin_unlock(&host_ldt_lock);
return;
}
spin_unlock(&host_ldt_lock);
- for(i = LDT_PAGES_MAX-1, order=0; i; i>>=1, order++);
+ for (i = LDT_PAGES_MAX-1, order=0; i; i>>=1, order++)
+ ;
ldt = (struct ldt_entry *)
__get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
- if(ldt == NULL) {
- printk("ldt_get_host_info: couldn't allocate buffer for host "
- "ldt\n");
+ if (ldt == NULL) {
+ printk(KERN_ERR "ldt_get_host_info: couldn't allocate buffer "
+ "for host ldt\n");
return;
}
ret = modify_ldt(0, ldt, (1<<order)*PAGE_SIZE);
- if(ret < 0) {
- printk("ldt_get_host_info: couldn't read host ldt\n");
+ if (ret < 0) {
+ printk(KERN_ERR "ldt_get_host_info: couldn't read host ldt\n");
goto out_free;
}
- if(ret == 0) {
+ if (ret == 0) {
/* default_ldt is active, simply write an empty entry 0 */
host_ldt_entries = dummy_list;
goto out_free;
}
- for(i=0, size=0; i<ret/LDT_ENTRY_SIZE; i++){
- if(ldt[i].a != 0 || ldt[i].b != 0)
+ for (i=0, size=0; i<ret/LDT_ENTRY_SIZE; i++) {
+ if (ldt[i].a != 0 || ldt[i].b != 0)
size++;
}
- if(size < ARRAY_SIZE(dummy_list))
+ if (size < ARRAY_SIZE(dummy_list))
host_ldt_entries = dummy_list;
else {
size = (size + 1) * sizeof(dummy_list[0]);
tmp = kmalloc(size, GFP_KERNEL);
- if(tmp == NULL) {
- printk("ldt_get_host_info: couldn't allocate host ldt "
- "list\n");
+ if (tmp == NULL) {
+ printk(KERN_ERR "ldt_get_host_info: couldn't allocate "
+ "host ldt list\n");
goto out_free;
}
host_ldt_entries = tmp;
}
- for(i=0, k=0; i<ret/LDT_ENTRY_SIZE; i++){
- if(ldt[i].a != 0 || ldt[i].b != 0) {
+ for (i=0, k=0; i<ret/LDT_ENTRY_SIZE; i++) {
+ if (ldt[i].a != 0 || ldt[i].b != 0)
host_ldt_entries[k++] = i;
- }
}
host_ldt_entries[k] = -1;
free_pages((unsigned long)ldt, order);
}
-long init_new_ldt(struct mmu_context_skas * new_mm,
- struct mmu_context_skas * from_mm)
+long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
{
struct user_desc desc;
short * num_p;
struct proc_mm_op copy;
- if(!ptrace_ldt)
- init_MUTEX(&new_mm->ldt.semaphore);
+ if (!ptrace_ldt)
+ mutex_init(&new_mm->ldt.lock);
- if(!from_mm){
+ if (!from_mm) {
memset(&desc, 0, sizeof(desc));
/*
* We have to initialize a clean ldt.
*/
- if(proc_mm) {
+ if (proc_mm) {
/*
* If the new mm was created using proc_mm, host's
* default-ldt currently is assigned, which normally
* To remove these gates, we simply write an empty
* entry as number 0 to the host.
*/
- err = write_ldt_entry(&new_mm->id, 1, &desc,
- &addr, 1);
+ err = write_ldt_entry(&new_mm->id, 1, &desc, &addr, 1);
}
else{
/*
* will be reset in the following loop
*/
ldt_get_host_info();
- for(num_p=host_ldt_entries; *num_p != -1; num_p++){
+ for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
desc.entry_number = *num_p;
err = write_ldt_entry(&new_mm->id, 1, &desc,
&addr, *(num_p + 1) == -1);
- if(err)
+ if (err)
break;
}
}
goto out;
}
- if(proc_mm){
- /* We have a valid from_mm, so we now have to copy the LDT of
+ if (proc_mm) {
+ /*
+ * We have a valid from_mm, so we now have to copy the LDT of
* from_mm to new_mm, because using proc_mm an new mm with
* an empty/default LDT was created in new_mm()
*/
{ .copy_segments =
from_mm->id.u.mm_fd } } );
i = os_write_file(new_mm->id.u.mm_fd, ©, sizeof(copy));
- if(i != sizeof(copy))
- printk("new_mm : /proc/mm copy_segments failed, "
- "err = %d\n", -i);
+ if (i != sizeof(copy))
+ printk(KERN_ERR "new_mm : /proc/mm copy_segments "
+ "failed, err = %d\n", -i);
}
- if(!ptrace_ldt) {
- /* Our local LDT is used to supply the data for
+ if (!ptrace_ldt) {
+ /*
+ * Our local LDT is used to supply the data for
* modify_ldt(READLDT), if PTRACE_LDT isn't available,
* i.e., we have to use the stub for modify_ldt, which
* can't handle the big read buffer of up to 64kB.
*/
- down(&from_mm->ldt.semaphore);
- if(from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES){
+ mutex_lock(&from_mm->ldt.lock);
+ if (from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES)
memcpy(new_mm->ldt.u.entries, from_mm->ldt.u.entries,
sizeof(new_mm->ldt.u.entries));
- }
- else{
+ else {
i = from_mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
- while(i-->0){
+ while (i-->0) {
page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
- if (!page){
+ if (!page) {
err = -ENOMEM;
break;
}
}
}
new_mm->ldt.entry_count = from_mm->ldt.entry_count;
- up(&from_mm->ldt.semaphore);
+ mutex_unlock(&from_mm->ldt.lock);
}
out:
}
-void free_ldt(struct mmu_context_skas * mm)
+void free_ldt(struct mm_context *mm)
{
int i;
- if(!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES){
+ if (!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES) {
i = mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE;
- while(i-- > 0){
- free_page((long )mm->ldt.u.pages[i]);
- }
+ while (i-- > 0)
+ free_page((long) mm->ldt.u.pages[i]);
}
mm->ldt.entry_count = 0;
}
-#endif
int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
{
- return CHOOSE_MODE_PROC(do_modify_ldt_tt, do_modify_ldt_skas, func,
- ptr, bytecount);
+ return do_modify_ldt_skas(func, ptr, bytecount);
}
git.openpandora.org / pandora-kernel.git / blobdiff