profile-low.S
1.59 KB
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###############################################################################
#
# Fast profiling interrupt handler
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/smp.h>
#include <asm/intctl-regs.h>
#include <asm/timer-regs.h>
#define pi break
.balign 4
counter:
.long -1
###############################################################################
#
# Profiling interrupt entry point
# - intended to run at interrupt priority 1
#
###############################################################################
ENTRY(profile_handler)
movm [d2,d3,a2],(sp)
# ignore userspace
mov (12,sp),d2
and EPSW_nSL,d2
bne out
# do nothing if there's no buffer
mov (prof_buffer),a2
and a2,a2
beq out
or 0x20000000,a2
# calculate relative position in text segment
mov (16,sp),d2
sub _stext,d2
mov (prof_shift),d3
lsr d3,d2
mov (prof_len),d3
cmp d3,d2
bcc outside_text
# increment the appropriate profile bucket
do_inc:
asl2 d2
mov (a2,d2),d3
inc d3
mov d3,(a2,d2)
out:
mov GxICR_DETECT,d2
movbu d2,(TM11ICR) # ACK the interrupt
movbu (TM11ICR),d2
movm (sp),[d2,d3,a2]
rti
outside_text:
sub 1,d3
mov d3,d2
bra do_inc