[mirror_ubuntu-bionic-kernel.git] / arch / sh / kernel / process.c

#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_CC_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)
{
#ifdef CONFIG_SUPERH32
	unlazy_fpu(src, task_pt_regs(src));
#endif
	*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 | SLAB_NOTRACK, 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;
}
Commit	Line	Data
cbf6b1ba PM	1	#include <linux/mm.h>
cbf6b1ba PM	2	#include <linux/kernel.h>
5a0e3ad6	3	#include <linux/slab.h>
174cd4b1	4	#include <linux/sched/signal.h>
68db0cf1	5	#include <linux/sched/task_stack.h>
5d920bb9 FA	6	#include <linux/export.h>
5d920bb9 FA	7	#include <linux/stackprotector.h>
936c163a	8	#include <asm/fpu.h>
4cf421e5	9	#include <asm/ptrace.h>
cbf6b1ba	10
0ea820cf PM	11	struct kmem_cache *task_xstate_cachep = NULL;
	12	unsigned int xstate_size;
	13
5d920bb9 FA	14	#ifdef CONFIG_CC_STACKPROTECTOR
	15	unsigned long __stack_chk_guard __read_mostly;
	16	EXPORT_SYMBOL(__stack_chk_guard);
	17	#endif
	18
55ccf3fe SS	19	/*
	20	* this gets called so that we can store lazy state into memory and copy the
	21	* current task into the new thread.
	22	*/
0ea820cf PM	23	int arch_dup_task_struct(struct task_struct dst, struct task_struct src)
0ea820cf PM	24	{
55ccf3fe SS	25	#ifdef CONFIG_SUPERH32
	26	unlazy_fpu(src, task_pt_regs(src));
	27	#endif
0ea820cf PM	28	dst = src;
	29
	30	if (src->thread.xstate) {
	31	dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
	32	GFP_KERNEL);
	33	if (!dst->thread.xstate)
	34	return -ENOMEM;
	35	memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
	36	}
	37
	38	return 0;
	39	}
	40
	41	void free_thread_xstate(struct task_struct *tsk)
	42	{
	43	if (tsk->thread.xstate) {
	44	kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
	45	tsk->thread.xstate = NULL;
	46	}
	47	}
	48
df9a7b9b	49	void arch_release_task_struct(struct task_struct *tsk)
cbf6b1ba	50	{
df9a7b9b	51	free_thread_xstate(tsk);
cbf6b1ba	52	}
0ea820cf PM	53
	54	void arch_task_cache_init(void)
	55	{
	56	if (!xstate_size)
	57	return;
	58
	59	task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
	60	__alignof__(union thread_xstate),
	61	SLAB_PANIC \| SLAB_NOTRACK, NULL);
	62	}
	63
	64	#ifdef CONFIG_SH_FPU_EMU
	65	# define HAVE_SOFTFP 1
	66	#else
	67	# define HAVE_SOFTFP 0
	68	#endif
	69
4603f53a	70	void init_thread_xstate(void)
0ea820cf PM	71	{
	72	if (boot_cpu_data.flags & CPU_HAS_FPU)
	73	xstate_size = sizeof(struct sh_fpu_hard_struct);
	74	else if (HAVE_SOFTFP)
	75	xstate_size = sizeof(struct sh_fpu_soft_struct);
	76	else
	77	xstate_size = 0;
	78	}