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authorStephen Rothwell <sfr@canb.auug.org.au>2008-08-01 15:20:30 +1000
committerPaul Mackerras <paulus@samba.org>2008-08-04 12:02:00 +1000
commitb8b572e1015f81b4e748417be2629dfe51ab99f9 (patch)
tree7df58667d5ed71d6c8f8f4ce40ca16b6fb776d0b /arch/powerpc/include/asm/sstep.h
parent2b12a4c524812fb3f6ee590a02e65b95c8c32229 (diff)
powerpc: Move include files to arch/powerpc/include/asm
from include/asm-powerpc. This is the result of a mkdir arch/powerpc/include/asm git mv include/asm-powerpc/* arch/powerpc/include/asm Followed by a few documentation/comment fixups and a couple of places where <asm-powepc/...> was being used explicitly. Of the latter only one was outside the arch code and it is a driver only built for powerpc. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/sstep.h')
-rw-r--r--arch/powerpc/include/asm/sstep.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/sstep.h b/arch/powerpc/include/asm/sstep.h
new file mode 100644
index 00000000000..f593b0f9b62
--- /dev/null
+++ b/arch/powerpc/include/asm/sstep.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2004 Paul Mackerras <paulus@au.ibm.com>, IBM
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+struct pt_regs;
+
+/*
+ * We don't allow single-stepping an mtmsrd that would clear
+ * MSR_RI, since that would make the exception unrecoverable.
+ * Since we need to single-step to proceed from a breakpoint,
+ * we don't allow putting a breakpoint on an mtmsrd instruction.
+ * Similarly we don't allow breakpoints on rfid instructions.
+ * These macros tell us if an instruction is a mtmsrd or rfid.
+ * Note that IS_MTMSRD returns true for both an mtmsr (32-bit)
+ * and an mtmsrd (64-bit).
+ */
+#define IS_MTMSRD(instr) (((instr) & 0xfc0007be) == 0x7c000124)
+#define IS_RFID(instr) (((instr) & 0xfc0007fe) == 0x4c000024)
+#define IS_RFI(instr) (((instr) & 0xfc0007fe) == 0x4c000064)
+
+/* Emulate instructions that cause a transfer of control. */
+extern int emulate_step(struct pt_regs *regs, unsigned int instr);