projects / linux.git / blame
| 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 | ||
| 050e9baa | 15 | #ifdef CONFIG_STACKPROTECTOR |
| 5d920bb9 FA |
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 | 26 | unlazy_fpu(src, task_pt_regs(src)); |
| 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), | |
| 75f296d9 | 60 | SLAB_PANIC, NULL); |
| 0ea820cf PM |
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 | } |