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kstack.h

#ifndef _KSTACK_H
#define _KSTACK_H

#include <linux/thread_info.h>
#include <linux/sched.h>
#include <asm/ptrace.h>
#include <asm/irq.h>

/* SP must be STACK_BIAS adjusted already.  */
static inline bool kstack_valid(struct thread_info *tp, unsigned long sp)
{
      unsigned long base = (unsigned long) tp;

      if (sp >= (base + sizeof(struct thread_info)) &&
          sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
            return true;

      if (hardirq_stack[tp->cpu]) {
            base = (unsigned long) hardirq_stack[tp->cpu];
            if (sp >= base &&
                sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
                  return true;
            base = (unsigned long) softirq_stack[tp->cpu];
            if (sp >= base &&
                sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
                  return true;
      }
      return false;
}

/* Does "regs" point to a valid pt_regs trap frame?  */
static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs)
{
      unsigned long base = (unsigned long) tp;
      unsigned long addr = (unsigned long) regs;

      if (addr >= base &&
          addr <= (base + THREAD_SIZE - sizeof(*regs)))
            goto check_magic;

      if (hardirq_stack[tp->cpu]) {
            base = (unsigned long) hardirq_stack[tp->cpu];
            if (addr >= base &&
                addr <= (base + THREAD_SIZE - sizeof(*regs)))
                  goto check_magic;
            base = (unsigned long) softirq_stack[tp->cpu];
            if (addr >= base &&
                addr <= (base + THREAD_SIZE - sizeof(*regs)))
                  goto check_magic;
      }
      return false;

check_magic:
      if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC)
            return true;
      return false;

}

#endif /* _KSTACK_H */

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