LXR linux/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.  */
  10static 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?  */
  32static 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
  53check_magic:
  54        if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC)
  55                return true;
  56        return false;
  57
  58}
  59
  60#endif /* _KSTACK_H */
  61