1 files changed, 114 insertions, 192 deletions

diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index a939a7ef022..67c0958eb98 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -1,106 +1,30 @@
 /*
- * 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 "linux/mm.h"
 #include "asm/unistd.h"
-#include "choose-mode.h"
-#include "kern.h"
-#include "mode_kern.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)
 {
 	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
@@ -108,12 +32,12 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 		 *
 		 * Note: I'm unsure: should interrupts be disabled here?
 		 */
-		if(!current->active_mm || current->active_mm == &init_mm ||
-		   mm_idp != &current->active_mm->context.skas.id)
-			switch_mm_skas(mm_idp);
+		if (!current->active_mm || current->active_mm == &init_mm ||
+		    mm_idp != &current->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,
@@ -121,7 +45,7 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 		u32 cpu;
 		int pid;
 
-		if(!proc_mm)
+		if (!proc_mm)
 			pid = mm_idp->u.pid;
 		else {
 			cpu = get_cpu();
@@ -130,7 +54,7 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 
 		res = os_ptrace_ldt(pid, 0, (unsigned long) &ldt_op);
 
-		if(proc_mm)
+		if (proc_mm)
 			put_cpu();
 	}
 	else {
@@ -139,7 +63,7 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * desc,
 					(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),
@@ -149,13 +73,14 @@ long write_ldt_entry(struct mm_id * mm_idp, int func, struct user_desc * 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 != &current->active_mm->context.skas.id)
-			switch_mm_skas(&current->active_mm->context.skas.id);
+		if (current->active_mm && current->active_mm != &init_mm &&
+		    mm_idp != &current->active_mm->context.id)
+			__switch_mm(&current->active_mm->context.id);
 	}
 
 	return res;
@@ -170,21 +95,22 @@ static long read_ldt_from_host(void __user * ptr, unsigned long bytecount)
 			.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:
@@ -209,35 +135,34 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
 {
 	int i, err = 0;
 	unsigned long size;
-	uml_ldt_t * ldt = &current->mm->context.skas.ldt;
+	uml_ldt_t * ldt = &current->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){
+	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;
 			}
@@ -247,10 +172,10 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
 	}
 	up(&ldt->semaphore);
 
-	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:
@@ -261,15 +186,16 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
 {
 	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;
@@ -277,60 +203,60 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
 
 static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
 {
-	uml_ldt_t * ldt = &current->mm->context.skas.ldt;
-	struct mm_id * mm_idp = &current->mm->context.skas.id;
+	uml_ldt_t * ldt = &current->mm->context.ldt;
+	struct mm_id * mm_idp = &current->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)
+		down(&ldt->semaphore);
 
 	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,
@@ -339,17 +265,17 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
 			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;
 	}
@@ -400,7 +326,7 @@ static void ldt_get_host_info(void)
 
 	spin_lock(&host_ldt_lock);
 
-	if(host_ldt_entries != NULL){
+	if (host_ldt_entries != NULL) {
 		spin_unlock(&host_ldt_lock);
 		return;
 	}
@@ -408,49 +334,49 @@ static void ldt_get_host_info(void)
 
 	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;
 
@@ -458,8 +384,7 @@ out_free:
 	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;
@@ -469,15 +394,15 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 	struct proc_mm_op copy;
 
 
-	if(!ptrace_ldt)
+	if (!ptrace_ldt)
 		init_MUTEX(&new_mm->ldt.semaphore);
 
-	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
@@ -485,8 +410,7 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 			 * 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{
 			/*
@@ -495,11 +419,11 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 			 * 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;
 			}
 		}
@@ -508,8 +432,9 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 		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()
 		 */
@@ -518,27 +443,27 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 					      { .copy_segments =
 							from_mm->id.u.mm_fd } } );
 		i = os_write_file(new_mm->id.u.mm_fd, &copy, 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){
+		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;
 				}
@@ -557,22 +482,19 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
 }
 
 
-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);
 }