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        /* Stack pointer must be 16-byte aligned.  */
  15        if (sp & (16UL - 1))
  16                return false;
  17
  18        if (sp >= (base + sizeof(struct thread_info)) &&
  19            sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  20                return true;
  21
  22        if (hardirq_stack[tp->cpu]) {
  23                base = (unsigned long) hardirq_stack[tp->cpu];
  24                if (sp >= base &&
  25                    sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  26                        return true;
  27                base = (unsigned long) softirq_stack[tp->cpu];
  28                if (sp >= base &&
  29                    sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  30                        return true;
  31        }
  32        return false;
  33}
  34
  35/* Does "regs" point to a valid pt_regs trap frame?  */
  36static inline bool kstack_is_trap_frame(struct thread_info *tp, struct pt_regs *regs)
  37{
  38        unsigned long base = (unsigned long) tp;
  39        unsigned long addr = (unsigned long) regs;
  40
  41        if (addr >= base &&
  42            addr <= (base + THREAD_SIZE - sizeof(*regs)))
  43                goto check_magic;
  44
  45        if (hardirq_stack[tp->cpu]) {
  46                base = (unsigned long) hardirq_stack[tp->cpu];
  47                if (addr >= base &&
  48                    addr <= (base + THREAD_SIZE - sizeof(*regs)))
  49                        goto check_magic;
  50                base = (unsigned long) softirq_stack[tp->cpu];
  51                if (addr >= base &&
  52                    addr <= (base + THREAD_SIZE - sizeof(*regs)))
  53                        goto check_magic;
  54        }
  55        return false;
  56
  57check_magic:
  58        if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC)
  59                return true;
  60        return false;
  61
  62}
  63
  64static inline __attribute__((always_inline)) void *set_hardirq_stack(void)
  65{
  66        void *orig_sp, *sp = hardirq_stack[smp_processor_id()];
  67
  68        __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp));
  69        if (orig_sp < sp ||
  70            orig_sp > (sp + THREAD_SIZE)) {
  71                sp += THREAD_SIZE - 192 - STACK_BIAS;
  72                __asm__ __volatile__("mov %0, %%sp" : : "r" (sp));
  73        }
  74
  75        return orig_sp;
  76}
  77
  78static inline __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp)
  79{
  80        __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));
  81}
  82
  83#endif /* _KSTACK_H */
  84