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Linux/arch/sh/kernel/process.c

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

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