2 #include <linux/kernel.h>
3 #include <linux/slab.h>
4 #include <linux/sched.h>
5 #include <linux/export.h>
6 #include <linux/stackprotector.h>
8 struct kmem_cache *task_xstate_cachep = NULL;
9 unsigned int xstate_size;
11 #ifdef CONFIG_CC_STACKPROTECTOR
12 unsigned long __stack_chk_guard __read_mostly;
13 EXPORT_SYMBOL(__stack_chk_guard);
17 * this gets called so that we can store lazy state into memory and copy the
18 * current task into the new thread.
20 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
22 #ifdef CONFIG_SUPERH32
23 unlazy_fpu(src, task_pt_regs(src));
27 if (src->thread.xstate) {
28 dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
30 if (!dst->thread.xstate)
32 memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
38 void free_thread_xstate(struct task_struct *tsk)
40 if (tsk->thread.xstate) {
41 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
42 tsk->thread.xstate = NULL;
46 void arch_release_task_struct(struct task_struct *tsk)
48 free_thread_xstate(tsk);
51 void arch_task_cache_init(void)
56 task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
57 __alignof__(union thread_xstate),
58 SLAB_PANIC | SLAB_NOTRACK, NULL);
61 #ifdef CONFIG_SH_FPU_EMU
62 # define HAVE_SOFTFP 1
64 # define HAVE_SOFTFP 0
67 void __cpuinit init_thread_xstate(void)
69 if (boot_cpu_data.flags & CPU_HAS_FPU)
70 xstate_size = sizeof(struct sh_fpu_hard_struct);
72 xstate_size = sizeof(struct sh_fpu_soft_struct);