arch/sparc/kernel/kstack.h

   1 #ifndef _KSTACK_H
   2 #define _KSTACK_H
   3
   4 #include <linux/thread_info.h>
   5 #include <linux/sched.h>
   6 #include <asm/ptrace.h>
   7 #include <asm/irq.h>
   8
   9 /* SP must be STACK_BIAS adjusted already.  */
  10 static inline bool kstack_valid(struct thread_info *tp, unsigned long sp)
  11 {
  12         unsigned long base = (unsigned long) tp;
  13
  14         if (sp >= (base + sizeof(struct thread_info)) &&
  15             sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  16                 return true;
  17
  18         if (hardirq_stack[tp->cpu]) {
  19                 base = (unsigned long) hardirq_stack[tp->cpu];
  20                 if (sp >= base &&
  21                     sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  22                         return true;
  23                 base = (unsigned long) softirq_stack[tp->cpu];
  24                 if (sp >= base &&
  25                     sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  26                         return true;
  27         }
  28         return false;
  29 }
  30
  31 /* Does "regs" point to a valid pt_regs trap frame?  */
  32 static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs)
  33 {
  34         unsigned long base = (unsigned long) tp;
  35         unsigned long addr = (unsigned long) regs;
  36
  37         if (addr >= base &&
  38             addr <= (base + THREAD_SIZE - sizeof(*regs)))
  39                 goto check_magic;
  40
  41         if (hardirq_stack[tp->cpu]) {
  42                 base = (unsigned long) hardirq_stack[tp->cpu];
  43                 if (addr >= base &&
  44                     addr <= (base + THREAD_SIZE - sizeof(*regs)))
  45                         goto check_magic;
  46                 base = (unsigned long) softirq_stack[tp->cpu];
  47                 if (addr >= base &&
  48                     addr <= (base + THREAD_SIZE - sizeof(*regs)))
  49                         goto check_magic;
  50         }
  51         return false;
  52
  53 check_magic:
  54         if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC)
  55                 return true;
  56         return false;
  57
  58 }
  59
  60 #endif /* _KSTACK_H */