1 files changed, 72 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/profile-low.S b/arch/mn10300/kernel/profile-low.S
new file mode 100644
index 000000000000..94ffac12d02d
--- /dev/null
+++ b/arch/mn10300/kernel/profile-low.S
@@ -0,0 +1,72 @@
+###############################################################################
+#
+# 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