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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/arch/x86/kernel/tls.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/kernel/tls.c')
-rw-r--r--ANDROID_3.4.5/arch/x86/kernel/tls.c217
1 files changed, 0 insertions, 217 deletions
diff --git a/ANDROID_3.4.5/arch/x86/kernel/tls.c b/ANDROID_3.4.5/arch/x86/kernel/tls.c
deleted file mode 100644
index 9d9d2f9e..00000000
--- a/ANDROID_3.4.5/arch/x86/kernel/tls.c
+++ /dev/null
@@ -1,217 +0,0 @@
-#include <linux/kernel.h>
-#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/ldt.h>
-#include <asm/processor.h>
-#include <asm/proto.h>
-#include <asm/syscalls.h>
-
-#include "tls.h"
-
-/*
- * sys_alloc_thread_area: get a yet unused TLS descriptor index.
- */
-static int get_free_idx(void)
-{
- struct thread_struct *t = &current->thread;
- int idx;
-
- for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; 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 == &current->thread)
- load_TLS(t, cpu);
-
- put_cpu();
-}
-
-/*
- * Set a given TLS descriptor:
- */
-int do_set_thread_area(struct task_struct *p, int idx,
- struct user_desc __user *u_info,
- int can_allocate)
-{
- struct user_desc info;
-
- if (copy_from_user(&info, u_info, sizeof(info)))
- return -EFAULT;
-
- if (idx == -1)
- idx = info.entry_number;
-
- /*
- * index -1 means the kernel should try to find and
- * allocate an empty descriptor:
- */
- if (idx == -1 && can_allocate) {
- idx = get_free_idx();
- if (idx < 0)
- return idx;
- if (put_user(idx, &u_info->entry_number))
- return -EFAULT;
- }
-
- if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
- return -EINVAL;
-
- set_tls_desc(p, idx, &info, 1);
-
- return 0;
-}
-
-asmlinkage int sys_set_thread_area(struct user_desc __user *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:
- */
-
-static void fill_user_desc(struct user_desc *info, int idx,
- const struct desc_struct *desc)
-
-{
- 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 task_struct *p, int idx,
- struct user_desc __user *u_info)
-{
- struct user_desc info;
-
- 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;
-
- 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 int sys_get_thread_area(struct user_desc __user *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 regset_tls_get(struct task_struct *target, const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
-{
- const struct desc_struct *tls;
-
- if (pos >= GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
- (pos % sizeof(struct user_desc)) != 0 ||
- (count % sizeof(struct user_desc)) != 0)
- return -EINVAL;
-
- 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;
-
- 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;
-}