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77 lines
1.7 KiB
77 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/mm.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/export.h> |
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#include <linux/stackprotector.h> |
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#include <asm/fpu.h> |
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#include <asm/ptrace.h> |
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struct kmem_cache *task_xstate_cachep = NULL; |
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unsigned int xstate_size; |
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#ifdef CONFIG_STACKPROTECTOR |
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unsigned long __stack_chk_guard __read_mostly; |
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EXPORT_SYMBOL(__stack_chk_guard); |
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#endif |
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/* |
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* this gets called so that we can store lazy state into memory and copy the |
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* current task into the new thread. |
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*/ |
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int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
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{ |
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unlazy_fpu(src, task_pt_regs(src)); |
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*dst = *src; |
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if (src->thread.xstate) { |
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dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, |
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GFP_KERNEL); |
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if (!dst->thread.xstate) |
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return -ENOMEM; |
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memcpy(dst->thread.xstate, src->thread.xstate, xstate_size); |
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} |
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return 0; |
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} |
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void free_thread_xstate(struct task_struct *tsk) |
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{ |
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if (tsk->thread.xstate) { |
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kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); |
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tsk->thread.xstate = NULL; |
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} |
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} |
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void arch_release_task_struct(struct task_struct *tsk) |
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{ |
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free_thread_xstate(tsk); |
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} |
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void arch_task_cache_init(void) |
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{ |
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if (!xstate_size) |
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return; |
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task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size, |
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__alignof__(union thread_xstate), |
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SLAB_PANIC, NULL); |
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} |
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#ifdef CONFIG_SH_FPU_EMU |
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# define HAVE_SOFTFP 1 |
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#else |
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# define HAVE_SOFTFP 0 |
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#endif |
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void init_thread_xstate(void) |
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{ |
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if (boot_cpu_data.flags & CPU_HAS_FPU) |
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xstate_size = sizeof(struct sh_fpu_hard_struct); |
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else if (HAVE_SOFTFP) |
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xstate_size = sizeof(struct sh_fpu_soft_struct); |
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else |
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xstate_size = 0; |
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}
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