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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 | |
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 |