arch/ia64/kernel/mca_drv_asm.S

   1 /*
   2  * File:        mca_drv_asm.S
   3  * Purpose:     Assembly portion of Generic MCA handling
   4  *
   5  * Copyright (C) 2004 FUJITSU LIMITED
   6  * Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com)
   7  */
   8 #include <linux/config.h>
   9 #include <linux/threads.h>
  10
  11 #include <asm/asmmacro.h>
  12 #include <asm/processor.h>
  13 #include <asm/ptrace.h>
  14
  15 GLOBAL_ENTRY(mca_handler_bhhook)
  16         invala                          // clear RSE ?
  17         ;;
  18         cover
  19         ;;
  20         clrrrb
  21         ;;
  22         alloc   r16=ar.pfs,0,2,1,0      // make a new frame
  23         ;;
  24         mov     ar.rsc=0
  25         ;;
  26         mov     r13=IA64_KR(CURRENT)    // current task pointer
  27         ;;
  28         mov     r2=r13
  29         ;;
  30         addl    r22=IA64_RBS_OFFSET,r2
  31         ;;
  32         mov     ar.bspstore=r22
  33         ;;
  34         addl    sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2
  35         ;;
  36         adds    r2=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
  37         ;;
  38         st1     [r2]=r0         // clear current->thread.on_ustack flag
  39         mov     loc0=r16
  40         movl    loc1=mca_handler_bh     // recovery C function
  41         ;;
  42         mov     out0=r8                 // poisoned address
  43         mov     b6=loc1
  44         ;;
  45         mov     loc1=rp
  46         ;;
  47         ssm     psr.i
  48         ;;
  49         br.call.sptk.many rp=b6         // does not return ...
  50         ;;
  51         mov     ar.pfs=loc0
  52         mov     rp=loc1
  53         ;;
  54         mov     r8=r0
  55         br.ret.sptk.many rp
  56         ;;
  57 END(mca_handler_bhhook)