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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
24counter:
25 .long -1
26
27###############################################################################
28#
29# Profiling interrupt entry point
30# - intended to run at interrupt priority 1
31#
32###############################################################################
33ENTRY(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
57do_inc:
58 asl2 d2
59 mov (a2,d2),d3
60 inc d3
61 mov d3,(a2,d2)
62out:
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
69outside_text:
70 sub 1,d3
71 mov d3,d2
72 bra do_inc