#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/user.h>
+#include <linux/regset.h>
#include <asm/uaccess.h>
#include <asm/desc.h>
#include <asm/processor.h>
#include <asm/proto.h>
+#include "tls.h"
+
/*
* sys_alloc_thread_area: get a yet unused TLS descriptor index.
*/
int idx;
for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
- if (desc_empty((struct n_desc_struct *)(t->tls_array) + idx))
+ if (desc_empty(&t->tls_array[idx]))
return idx + GDT_ENTRY_TLS_MIN;
return -ESRCH;
}
+static void set_tls_desc(struct task_struct *p, int idx,
+ const struct user_desc *info, int n)
+{
+ struct thread_struct *t = &p->thread;
+ struct desc_struct *desc = &t->tls_array[idx - GDT_ENTRY_TLS_MIN];
+ int cpu;
+
+ /*
+ * We must not get preempted while modifying the TLS.
+ */
+ cpu = get_cpu();
+
+ while (n-- > 0) {
+ if (LDT_empty(info))
+ desc->a = desc->b = 0;
+ else
+ fill_ldt(desc, info);
+ ++info;
+ ++desc;
+ }
+
+ if (t == ¤t->thread)
+ load_TLS(t, cpu);
+
+ put_cpu();
+}
+
/*
* Set a given TLS descriptor:
- * When you want addresses > 32bit use arch_prctl()
*/
-int do_set_thread_area(struct thread_struct *t, struct user_desc __user *u_info)
+int do_set_thread_area(struct task_struct *p, int idx,
+ struct user_desc __user *u_info,
+ int can_allocate)
{
struct user_desc info;
- struct n_desc_struct *desc;
- int cpu, idx;
if (copy_from_user(&info, u_info, sizeof(info)))
return -EFAULT;
- idx = info.entry_number;
+ if (idx == -1)
+ idx = info.entry_number;
/*
* index -1 means the kernel should try to find and
* allocate an empty descriptor:
*/
- if (idx == -1) {
+ if (idx == -1 && can_allocate) {
idx = get_free_idx();
if (idx < 0)
return idx;
if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
return -EINVAL;
- desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN;
-
- /*
- * We must not get preempted while modifying the TLS.
- */
- cpu = get_cpu();
-
- if (LDT_empty(&info)) {
- desc->a = 0;
- desc->b = 0;
- } else {
- desc->a = LDT_entry_a(&info);
- desc->b = LDT_entry_b(&info);
- }
- if (t == ¤t->thread)
- load_TLS(t, cpu);
+ set_tls_desc(p, idx, &info, 1);
- put_cpu();
return 0;
}
-asmlinkage long sys32_set_thread_area(struct user_desc __user *u_info)
+asmlinkage int sys_set_thread_area(struct user_desc __user *u_info)
{
- return do_set_thread_area(¤t->thread, u_info);
+ int ret = do_set_thread_area(current, -1, u_info, 1);
+ asmlinkage_protect(1, ret, u_info);
+ return ret;
}
* Get the current Thread-Local Storage area:
*/
-#define GET_LIMIT(desc) ( \
- ((desc)->a & 0x0ffff) | \
- ((desc)->b & 0xf0000) )
+static void fill_user_desc(struct user_desc *info, int idx,
+ const struct desc_struct *desc)
-#define GET_32BIT(desc) (((desc)->b >> 22) & 1)
-#define GET_CONTENTS(desc) (((desc)->b >> 10) & 3)
-#define GET_WRITABLE(desc) (((desc)->b >> 9) & 1)
-#define GET_LIMIT_PAGES(desc) (((desc)->b >> 23) & 1)
-#define GET_PRESENT(desc) (((desc)->b >> 15) & 1)
-#define GET_USEABLE(desc) (((desc)->b >> 20) & 1)
-#define GET_LONGMODE(desc) (((desc)->b >> 21) & 1)
+{
+ memset(info, 0, sizeof(*info));
+ info->entry_number = idx;
+ info->base_addr = get_desc_base(desc);
+ info->limit = get_desc_limit(desc);
+ info->seg_32bit = desc->d;
+ info->contents = desc->type >> 2;
+ info->read_exec_only = !(desc->type & 2);
+ info->limit_in_pages = desc->g;
+ info->seg_not_present = !desc->p;
+ info->useable = desc->avl;
+#ifdef CONFIG_X86_64
+ info->lm = desc->l;
+#endif
+}
-int do_get_thread_area(struct thread_struct *t, struct user_desc __user *u_info)
+int do_get_thread_area(struct task_struct *p, int idx,
+ struct user_desc __user *u_info)
{
struct user_desc info;
- struct n_desc_struct *desc;
- int idx;
- if (get_user(idx, &u_info->entry_number))
+ if (idx == -1 && get_user(idx, &u_info->entry_number))
return -EFAULT;
+
if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
return -EINVAL;
- desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN;
-
- memset(&info, 0, sizeof(struct user_desc));
- info.entry_number = idx;
- info.base_addr = get_desc_base(desc);
- info.limit = GET_LIMIT(desc);
- info.seg_32bit = GET_32BIT(desc);
- info.contents = GET_CONTENTS(desc);
- info.read_exec_only = !GET_WRITABLE(desc);
- info.limit_in_pages = GET_LIMIT_PAGES(desc);
- info.seg_not_present = !GET_PRESENT(desc);
- info.useable = GET_USEABLE(desc);
- info.lm = GET_LONGMODE(desc);
+ fill_user_desc(&info, idx,
+ &p->thread.tls_array[idx - GDT_ENTRY_TLS_MIN]);
if (copy_to_user(u_info, &info, sizeof(info)))
return -EFAULT;
return 0;
}
-asmlinkage long sys32_get_thread_area(struct user_desc __user *u_info)
+asmlinkage int sys_get_thread_area(struct user_desc __user *u_info)
{
- return do_get_thread_area(¤t->thread, u_info);
+ int ret = do_get_thread_area(current, -1, u_info);
+ asmlinkage_protect(1, ret, u_info);
+ return ret;
}
+int regset_tls_active(struct task_struct *target,
+ const struct user_regset *regset)
+{
+ struct thread_struct *t = &target->thread;
+ int n = GDT_ENTRY_TLS_ENTRIES;
+ while (n > 0 && desc_empty(&t->tls_array[n - 1]))
+ --n;
+ return n;
+}
-int ia32_child_tls(struct task_struct *p, struct pt_regs *childregs)
+int regset_tls_get(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ void *kbuf, void __user *ubuf)
{
- struct n_desc_struct *desc;
- struct user_desc info;
- struct user_desc __user *cp;
- int idx;
+ const struct desc_struct *tls;
- cp = (void __user *)childregs->rsi;
- if (copy_from_user(&info, cp, sizeof(info)))
- return -EFAULT;
- if (LDT_empty(&info))
+ if (pos > GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
+ (pos % sizeof(struct user_desc)) != 0 ||
+ (count % sizeof(struct user_desc)) != 0)
return -EINVAL;
- idx = info.entry_number;
- if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
+ pos /= sizeof(struct user_desc);
+ count /= sizeof(struct user_desc);
+
+ tls = &target->thread.tls_array[pos];
+
+ if (kbuf) {
+ struct user_desc *info = kbuf;
+ while (count-- > 0)
+ fill_user_desc(info++, GDT_ENTRY_TLS_MIN + pos++,
+ tls++);
+ } else {
+ struct user_desc __user *u_info = ubuf;
+ while (count-- > 0) {
+ struct user_desc info;
+ fill_user_desc(&info, GDT_ENTRY_TLS_MIN + pos++, tls++);
+ if (__copy_to_user(u_info++, &info, sizeof(info)))
+ return -EFAULT;
+ }
+ }
+
+ return 0;
+}
+
+int regset_tls_set(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct user_desc infobuf[GDT_ENTRY_TLS_ENTRIES];
+ const struct user_desc *info;
+
+ if (pos > GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
+ (pos % sizeof(struct user_desc)) != 0 ||
+ (count % sizeof(struct user_desc)) != 0)
return -EINVAL;
- desc = (struct n_desc_struct *)(p->thread.tls_array) + idx - GDT_ENTRY_TLS_MIN;
- desc->a = LDT_entry_a(&info);
- desc->b = LDT_entry_b(&info);
+ if (kbuf)
+ info = kbuf;
+ else if (__copy_from_user(infobuf, ubuf, count))
+ return -EFAULT;
+ else
+ info = infobuf;
+
+ set_tls_desc(target,
+ GDT_ENTRY_TLS_MIN + (pos / sizeof(struct user_desc)),
+ info, count / sizeof(struct user_desc));
return 0;
}
projects / linux-2.6 / blobdiff