[src/netbsd-1-4]: src/sys/arch/powerpc/include Pull up revision 1.2 (requeste...

[he <he%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d0cf5e3ab1f3
branches:  netbsd-1-4
changeset: 470110:d0cf5e3ab1f3
user:      he <he%NetBSD.org@localhost>
date:      Thu Jan 20 21:27:54 2000 +0000

description:
Pull up revision 1.2 (requested by danw):
  Add (the beginnings of) an unaligned access handler for the
  powerpc, to get around the fact that gcc currently generates bad
  floating point copies sometimes, which breaks various things,

diffstat:

 sys/arch/powerpc/include/trap.h |  20 +++++++++++++++++++-
 1 files changed, 19 insertions(+), 1 deletions(-)

diffs (32 lines):

diff -r 88f7c7799b64 -r d0cf5e3ab1f3 sys/arch/powerpc/include/trap.h
--- a/sys/arch/powerpc/include/trap.h   Thu Jan 20 21:27:14 2000 +0000
+++ b/sys/arch/powerpc/include/trap.h   Thu Jan 20 21:27:54 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: trap.h,v 1.1 1996/09/30 16:34:35 ws Exp $      */
+/*     $NetBSD: trap.h,v 1.1.22.1 2000/01/20 21:27:54 he Exp $ */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -64,4 +64,22 @@
 /* Trap was in user mode */
 #define        EXC_USER        0x10000
 
+
+/*
+ * EXC_ALI sets bits in the DSISR and DAR to provide enough
+ * information to recover from the unaligned access without needing to
+ * parse the offending instruction. This includes certain bits of the
+ * opcode, and information about what registers are used. The opcode
+ * indicator values below come from Appendix F of Book III of "The
+ * PowerPC Architecture".
+ */
+
+#define EXC_ALI_OPCODE_INDICATOR(dsisr) ((dsisr >> 10) & 0x7f)
+#define EXC_ALI_LFD    0x09
+#define EXC_ALI_STFD   0x0b
+
+/* Macros to extract register information */
+#define EXC_ALI_RST(dsisr) ((dsisr >> 5) & 0x1f)   /* source or target */
+#define EXC_ALI_RA(dsisr) (dsisr & 0x1f)
+
 #endif /* _MACHINE_TRAP_H_ */