arch/mn10300/kernel/profile-low.S

   1 ###############################################################################
   2 #
   3 # Fast profiling interrupt handler
   4 #
   5 # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   6 # Written by David Howells (dhowells@redhat.com)
   7 #
   8 # This program is free software; you can redistribute it and/or
   9 # modify it under the terms of the GNU General Public Licence
  10 # as published by the Free Software Foundation; either version
  11 # 2 of the Licence, or (at your option) any later version.
  12 #
  13 ###############################################################################
  14 #include <linux/sys.h>
  15 #include <linux/linkage.h>
  16 #include <asm/segment.h>
  17 #include <asm/smp.h>
  18 #include <asm/intctl-regs.h>
  19 #include <asm/timer-regs.h>
  20
  21 #define pi break
  22
  23         .balign 4
  24 counter:
  25         .long   -1
  26
  27 ###############################################################################
  28 #
  29 # Profiling interrupt entry point
  30 # - intended to run at interrupt priority 1
  31 #
  32 ###############################################################################
  33 ENTRY(profile_handler)
  34         movm    [d2,d3,a2],(sp)
  35
  36         # ignore userspace
  37         mov     (12,sp),d2
  38         and     EPSW_nSL,d2
  39         bne     out
  40
  41         # do nothing if there's no buffer
  42         mov     (prof_buffer),a2
  43         and     a2,a2
  44         beq     out
  45         or      0x20000000,a2
  46
  47         # calculate relative position in text segment
  48         mov     (16,sp),d2
  49         sub     _stext,d2
  50         mov     (prof_shift),d3
  51         lsr     d3,d2
  52         mov     (prof_len),d3
  53         cmp     d3,d2
  54         bcc     outside_text
  55
  56         # increment the appropriate profile bucket
  57 do_inc:
  58         asl2    d2
  59         mov     (a2,d2),d3
  60         inc     d3
  61         mov     d3,(a2,d2)
  62 out:
  63         mov     GxICR_DETECT,d2
  64         movbu   d2,(TM11ICR)            # ACK the interrupt
  65         movbu   (TM11ICR),d2
  66         movm    (sp),[d2,d3,a2]
  67         rti
  68
  69 outside_text:
  70         sub     1,d3
  71         mov     d3,d2
  72         bra     do_inc