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