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// SPDX-License-Identifier: GPL-2.0
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
#include <linux/export.h>
#include <linux/stackprotector.h>
#include <asm/fpu.h>
#include <asm/ptrace.h>
struct kmem_cache *task_xstate_cachep = NULL;
unsigned int xstate_size;
#ifdef CONFIG_STACKPROTECTOR
unsigned long __stack_chk_guard __read_mostly;
EXPORT_SYMBOL(__stack_chk_guard);
#endif
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
*/
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
unlazy_fpu(src, task_pt_regs(src));
*dst = *src;
if (src->thread.xstate) {
dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
GFP_KERNEL);
if (!dst->thread.xstate)
return -ENOMEM;
memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
}
return 0;
}
void free_thread_xstate(struct task_struct *tsk)
{
if (tsk->thread.xstate) {
kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
tsk->thread.xstate = NULL;
}
}
void arch_release_task_struct(struct task_struct *tsk)
{
free_thread_xstate(tsk);
}
void arch_task_cache_init(void)
{
if (!xstate_size)
return;
task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
__alignof__(union thread_xstate),
SLAB_PANIC, NULL);
}
#ifdef CONFIG_SH_FPU_EMU
# define HAVE_SOFTFP 1
#else
# define HAVE_SOFTFP 0
#endif
void init_thread_xstate(void)
{
if (boot_cpu_data.flags & CPU_HAS_FPU)
xstate_size = sizeof(struct sh_fpu_hard_struct);
else if (HAVE_SOFTFP)
xstate_size = sizeof(struct sh_fpu_soft_struct);
else
xstate_size = 0;
}
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