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