summaryrefslogtreecommitdiffstats
path: root/arch/mn10300/include/asm/frame.inc
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2009-04-29 14:46:59 +0200
committerIngo Molnar <mingo@elte.hu>2009-04-29 14:47:05 +0200
commite7fd5d4b3d240f42c30a9e3d20a4689c4d3a795a (patch)
tree4ba588631dd8189a818a91c9e3976526071178b6 /arch/mn10300/include/asm/frame.inc
parent1130b0296184bc21806225fd06d533515a99d2db (diff)
parent56a50adda49b2020156616c4eb15353e0f9ad7de (diff)
downloadblackbird-op-linux-e7fd5d4b3d240f42c30a9e3d20a4689c4d3a795a.tar.gz
blackbird-op-linux-e7fd5d4b3d240f42c30a9e3d20a4689c4d3a795a.zip
Merge branch 'linus' into perfcounters/core
Merge reason: This brach was on -rc1, refresh it to almost-rc4 to pick up the latest upstream fixes. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/mn10300/include/asm/frame.inc')
-rw-r--r--arch/mn10300/include/asm/frame.inc91
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/frame.inc b/arch/mn10300/include/asm/frame.inc
new file mode 100644
index 000000000000..5b1949bdf039
--- /dev/null
+++ b/arch/mn10300/include/asm/frame.inc
@@ -0,0 +1,91 @@
+/* MN10300 Microcontroller core system register definitions -*- asm -*-
+ *
+ * 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.
+ */
+#ifndef _ASM_FRAME_INC
+#define _ASM_FRAME_INC
+
+#ifndef __ASSEMBLY__
+#error not for use in C files
+#endif
+
+#ifndef __ASM_OFFSETS_H__
+#include <asm/asm-offsets.h>
+#endif
+
+#define pi break
+
+#define fp a3
+
+###############################################################################
+#
+# build a stack frame from the registers
+# - the caller has subtracted 4 from SP before coming here
+#
+###############################################################################
+.macro SAVE_ALL
+ add -4,sp # next exception frame ptr save area
+ movm [other],(sp)
+ mov usp,a1
+ mov a1,(sp) # USP in MOVM[other] dummy slot
+ movm [d2,d3,a2,a3,exreg0,exreg1,exother],(sp)
+ mov sp,fp # FRAME pointer in A3
+ add -12,sp # allow for calls to be made
+ mov (__frame),a1
+ mov a1,(REG_NEXT,fp)
+ mov fp,(__frame)
+
+ and ~EPSW_FE,epsw # disable the FPU inside the kernel
+
+ # we may be holding current in E2
+#ifdef CONFIG_MN10300_CURRENT_IN_E2
+ mov (__current),e2
+#endif
+.endm
+
+###############################################################################
+#
+# restore the registers from a stack frame
+#
+###############################################################################
+.macro RESTORE_ALL
+ # peel back the stack to the calling frame
+ # - this permits execve() to discard extra frames due to kernel syscalls
+ mov (__frame),fp
+ mov fp,sp
+ mov (REG_NEXT,fp),d0 # userspace has regs->next == 0
+ mov d0,(__frame)
+
+#ifndef CONFIG_MN10300_USING_JTAG
+ mov (REG_EPSW,fp),d0
+ btst EPSW_T,d0
+ beq 99f
+
+ or EPSW_NMID,epsw
+ movhu (DCR),d1
+ or 0x0001, d1
+ movhu d1,(DCR)
+
+99:
+#endif
+ movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
+
+ # must restore usp even if returning to kernel space,
+ # when CONFIG_PREEMPT is enabled.
+ mov (sp),a1 # USP in MOVM[other] dummy slot
+ mov a1,usp
+
+ movm (sp),[other]
+ add 8,sp
+ rti
+
+.endm
+
+
+#endif /* _ASM_FRAME_INC */
OpenPOWER on IntegriCloud