1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/kernel.h>
4 #include <linux/slab.h>
5 #include <linux/sched/signal.h>
6 #include <linux/sched/task_stack.h>
7 #include <linux/export.h>
8 #include <linux/stackprotector.h>
10 #include <asm/ptrace.h>
12 struct kmem_cache *task_xstate_cachep = NULL;
13 unsigned int xstate_size;
15 #ifdef CONFIG_STACKPROTECTOR
16 unsigned long __stack_chk_guard __read_mostly;
17 EXPORT_SYMBOL(__stack_chk_guard);
21 * this gets called so that we can store lazy state into memory and copy the
22 * current task into the new thread.
24 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
26 unlazy_fpu(src, task_pt_regs(src));
29 if (src->thread.xstate) {
30 dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
32 if (!dst->thread.xstate)
34 memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
40 void free_thread_xstate(struct task_struct *tsk)
42 if (tsk->thread.xstate) {
43 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
44 tsk->thread.xstate = NULL;
48 void arch_release_task_struct(struct task_struct *tsk)
50 free_thread_xstate(tsk);
53 void arch_task_cache_init(void)
58 task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
59 __alignof__(union thread_xstate),
63 #ifdef CONFIG_SH_FPU_EMU
64 # define HAVE_SOFTFP 1
66 # define HAVE_SOFTFP 0
69 void init_thread_xstate(void)
71 if (boot_cpu_data.flags & CPU_HAS_FPU)
72 xstate_size = sizeof(struct sh_fpu_hard_struct);
74 xstate_size = sizeof(struct sh_fpu_soft_struct);