arch/sh/kernel/process.c

   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
   8 struct kmem_cache *task_xstate_cachep = NULL;
   9 unsigned int xstate_size;
  10
  11 #ifdef CONFIG_CC_STACKPROTECTOR
  12 unsigned long __stack_chk_guard __read_mostly;
  13 EXPORT_SYMBOL(__stack_chk_guard);
  14 #endif
  15
  16 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
  17 {
  18         *dst = *src;
  19
  20         if (src->thread.xstate) {
  21                 dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
  22                                                       GFP_KERNEL);
  23                 if (!dst->thread.xstate)
  24                         return -ENOMEM;
  25                 memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
  26         }
  27
  28         return 0;
  29 }
  30
  31 void free_thread_xstate(struct task_struct *tsk)
  32 {
  33         if (tsk->thread.xstate) {
  34                 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
  35                 tsk->thread.xstate = NULL;
  36         }
  37 }
  38
  39 void arch_release_task_struct(struct task_struct *tsk)
  40 {
  41         free_thread_xstate(tsk);
  42 }
  43
  44 void arch_task_cache_init(void)
  45 {
  46         if (!xstate_size)
  47                 return;
  48
  49         task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
  50                                                __alignof__(union thread_xstate),
  51                                                SLAB_PANIC | SLAB_NOTRACK, NULL);
  52 }
  53
  54 #ifdef CONFIG_SH_FPU_EMU
  55 # define HAVE_SOFTFP    1
  56 #else
  57 # define HAVE_SOFTFP    0
  58 #endif
  59
  60 void __cpuinit init_thread_xstate(void)
  61 {
  62         if (boot_cpu_data.flags & CPU_HAS_FPU)
  63                 xstate_size = sizeof(struct sh_fpu_hard_struct);
  64         else if (HAVE_SOFTFP)
  65                 xstate_size = sizeof(struct sh_fpu_soft_struct);
  66         else
  67                 xstate_size = 0;
  68 }