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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778// SPDX-License-Identifier: GPL-2.0#include <linux/mm.h>#include <linux/kernel.h>#include <linux/slab.h>#include <linux/sched/signal.h>#include <linux/sched/task_stack.h>#include <linux/export.h>#include <linux/stackprotector.h>#include <asm/fpu.h>#include <asm/ptrace.h>
struct kmem_cache *task_xstate_cachep = NULL;unsigned int xstate_size;
#ifdef CONFIG_STACKPROTECTORunsigned long __stack_chk_guard __read_mostly;EXPORT_SYMBOL(__stack_chk_guard);#endif
/* * this gets called so that we can store lazy state into memory and copy the * current task into the new thread. */int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src){ unlazy_fpu(src, task_pt_regs(src)); *dst = *src;
if (src->thread.xstate) { dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL); if (!dst->thread.xstate) return -ENOMEM; memcpy(dst->thread.xstate, src->thread.xstate, xstate_size); }
return 0;}
void free_thread_xstate(struct task_struct *tsk){ if (tsk->thread.xstate) { kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); tsk->thread.xstate = NULL; }}
void arch_release_task_struct(struct task_struct *tsk){ free_thread_xstate(tsk);}
void arch_task_cache_init(void){ if (!xstate_size) return;
task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size, __alignof__(union thread_xstate), SLAB_PANIC, NULL);}
#ifdef CONFIG_SH_FPU_EMU# define HAVE_SOFTFP 1#else# define HAVE_SOFTFP 0#endif
void init_thread_xstate(void){ if (boot_cpu_data.flags & CPU_HAS_FPU) xstate_size = sizeof(struct sh_fpu_hard_struct); else if (HAVE_SOFTFP) xstate_size = sizeof(struct sh_fpu_soft_struct); else xstate_size = 0;}