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   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)