78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// 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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