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

  1#include <linux/mm.h>
  2#include <linux/kernel.h>
  3#include <linux/slab.h>
  4#include <linux/sched.h>
 
 
 
  5
  6struct kmem_cache *task_xstate_cachep = NULL;
  7unsigned int xstate_size;
  8
 
 
 
 
 
 
 
 
 
  9int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 10{
 
 
 
 11	*dst = *src;
 12
 13	if (src->thread.xstate) {
 14		dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
 15						      GFP_KERNEL);
 16		if (!dst->thread.xstate)
 17			return -ENOMEM;
 18		memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
 19	}
 20
 21	return 0;
 22}
 23
 24void free_thread_xstate(struct task_struct *tsk)
 25{
 26	if (tsk->thread.xstate) {
 27		kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
 28		tsk->thread.xstate = NULL;
 29	}
 30}
 31
 32#if THREAD_SHIFT < PAGE_SHIFT
 33static struct kmem_cache *thread_info_cache;
 34
 35struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
 36{
 37	struct thread_info *ti;
 38#ifdef CONFIG_DEBUG_STACK_USAGE
 39	gfp_t mask = GFP_KERNEL | __GFP_ZERO;
 40#else
 41	gfp_t mask = GFP_KERNEL;
 42#endif
 43
 44	ti = kmem_cache_alloc_node(thread_info_cache, mask, node);
 45	return ti;
 46}
 47
 48void free_thread_info(struct thread_info *ti)
 49{
 50	free_thread_xstate(ti->task);
 51	kmem_cache_free(thread_info_cache, ti);
 52}
 53
 54void thread_info_cache_init(void)
 55{
 56	thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
 57					      THREAD_SIZE, SLAB_PANIC, NULL);
 58}
 59#else
 60struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
 61{
 62#ifdef CONFIG_DEBUG_STACK_USAGE
 63	gfp_t mask = GFP_KERNEL | __GFP_ZERO;
 64#else
 65	gfp_t mask = GFP_KERNEL;
 66#endif
 67	struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);
 68
 69	return page ? page_address(page) : NULL;
 70}
 71
 72void free_thread_info(struct thread_info *ti)
 73{
 74	free_thread_xstate(ti->task);
 75	free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 76}
 77#endif /* THREAD_SHIFT < PAGE_SHIFT */
 78
 79void arch_task_cache_init(void)
 80{
 81	if (!xstate_size)
 82		return;
 83
 84	task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
 85					       __alignof__(union thread_xstate),
 86					       SLAB_PANIC | SLAB_NOTRACK, NULL);
 87}
 88
 89#ifdef CONFIG_SH_FPU_EMU
 90# define HAVE_SOFTFP	1
 91#else
 92# define HAVE_SOFTFP	0
 93#endif
 94
 95void __cpuinit init_thread_xstate(void)
 96{
 97	if (boot_cpu_data.flags & CPU_HAS_FPU)
 98		xstate_size = sizeof(struct sh_fpu_hard_struct);
 99	else if (HAVE_SOFTFP)
100		xstate_size = sizeof(struct sh_fpu_soft_struct);
101	else
102		xstate_size = 0;
103}