轉自：http://blog.chinaunix.net/uid-12461657-id-3487463.html

原文地址：Linux內核中的中斷棧與內核棧的補充說明 作者：MagicBoy2010

1. static inline int
   
2. 
   
3. execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq)
   
4. 
   
5. {
   
6. union irq_ctx *curctx, *irqctx;
   
7. u32 *isp, arg1, arg2;
   
8. 
   
9. curctx = (union irq_ctx *) current_thread_info();
   
10. irqctx = __this_cpu_read(hardirq_ctx);
    
11. /*
    
12. * this is where we switch to the IRQ stack. However, if we are
    
13. * already using the IRQ stack (because we interrupted a hardirq
    
14. * handler) we can‘t do that and just have to keep using the
    
15. * current stack (which is the irq stack already after all)
    
16. */
    
17. 
    
18. if (unlikely(curctx == irqctx))
    
19. return 0;
    
20. 
    
21. /* build the stack frame on the IRQ stack */
    
22. isp = (u32 *) ((char *)irqctx + sizeof(*irqctx));
    
23. irqctx->tinfo.task = curctx->tinfo.task;
    
24. irqctx->tinfo.previous_esp = current_stack_pointer;
    
25. 
    
26. /*
    
27. * Copy the softirq bits in preempt_count so that the
    
28. * softirq checks work in the hardirq context.
    
29. */
    
30. 
    
31. irqctx->tinfo.preempt_count =
    
32. (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |
    
33. (curctx->tinfo.preempt_count & SOFTIRQ_MASK);
    
34. 
    
35. if (unlikely(overflow))
    
36. call_on_stack(print_stack_overflow, isp);
    
37. 
    
38. asm volatile("xchgl %%ebx,%%esp \n"
    
39. "call *%%edi \n"
    
40. "movl %%ebx,%%esp \n"
    
41. : "=a" (arg1), "=d" (arg2), "=b" (isp)
    
42. : "0" (irq), "1" (desc), "2" (isp),
    
43. "D" (desc->handle_irq)
    
44. : "memory", "cc", "ecx");
    
45. 
    
46. return 1;
    
47. }

Linux內核中的中斷棧與內核棧的補充說明【轉】