Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cbf6b1ba PM |
2 | #include <linux/mm.h> |
3 | #include <linux/kernel.h> | |
5a0e3ad6 | 4 | #include <linux/slab.h> |
174cd4b1 | 5 | #include <linux/sched/signal.h> |
68db0cf1 | 6 | #include <linux/sched/task_stack.h> |
5d920bb9 FA |
7 | #include <linux/export.h> |
8 | #include <linux/stackprotector.h> | |
936c163a | 9 | #include <asm/fpu.h> |
4cf421e5 | 10 | #include <asm/ptrace.h> |
cbf6b1ba | 11 | |
0ea820cf PM |
12 | struct kmem_cache *task_xstate_cachep = NULL; |
13 | unsigned int xstate_size; | |
14 | ||
5d920bb9 FA |
15 | #ifdef CONFIG_CC_STACKPROTECTOR |
16 | unsigned long __stack_chk_guard __read_mostly; | |
17 | EXPORT_SYMBOL(__stack_chk_guard); | |
18 | #endif | |
19 | ||
55ccf3fe SS |
20 | /* |
21 | * this gets called so that we can store lazy state into memory and copy the | |
22 | * current task into the new thread. | |
23 | */ | |
0ea820cf PM |
24 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
25 | { | |
55ccf3fe SS |
26 | #ifdef CONFIG_SUPERH32 |
27 | unlazy_fpu(src, task_pt_regs(src)); | |
28 | #endif | |
0ea820cf PM |
29 | *dst = *src; |
30 | ||
31 | if (src->thread.xstate) { | |
32 | dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, | |
33 | GFP_KERNEL); | |
34 | if (!dst->thread.xstate) | |
35 | return -ENOMEM; | |
36 | memcpy(dst->thread.xstate, src->thread.xstate, xstate_size); | |
37 | } | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | void free_thread_xstate(struct task_struct *tsk) | |
43 | { | |
44 | if (tsk->thread.xstate) { | |
45 | kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); | |
46 | tsk->thread.xstate = NULL; | |
47 | } | |
48 | } | |
49 | ||
df9a7b9b | 50 | void arch_release_task_struct(struct task_struct *tsk) |
cbf6b1ba | 51 | { |
df9a7b9b | 52 | free_thread_xstate(tsk); |
cbf6b1ba | 53 | } |
0ea820cf PM |
54 | |
55 | void arch_task_cache_init(void) | |
56 | { | |
57 | if (!xstate_size) | |
58 | return; | |
59 | ||
60 | task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size, | |
61 | __alignof__(union thread_xstate), | |
62 | SLAB_PANIC | SLAB_NOTRACK, NULL); | |
63 | } | |
64 | ||
65 | #ifdef CONFIG_SH_FPU_EMU | |
66 | # define HAVE_SOFTFP 1 | |
67 | #else | |
68 | # define HAVE_SOFTFP 0 | |
69 | #endif | |
70 | ||
4603f53a | 71 | void init_thread_xstate(void) |
0ea820cf PM |
72 | { |
73 | if (boot_cpu_data.flags & CPU_HAS_FPU) | |
74 | xstate_size = sizeof(struct sh_fpu_hard_struct); | |
75 | else if (HAVE_SOFTFP) | |
76 | xstate_size = sizeof(struct sh_fpu_soft_struct); | |
77 | else | |
78 | xstate_size = 0; | |
79 | } |