* configure.in: Recognize aix4 specially as some aspects

        of aix4 need different handling than aix3.
        * configure: Updated.
        * config/powerpc/{aix4.mh,aix4.mt,tm-ppc-aix4.h}: New files
        specific to aix4 support on the power pc.
        * config/powerpc/tm-ppc-aix.h (DONT_RELOCATE_SYMFILE_OBJFILE): Do
        not defined.  The aix4 specific target files will do that.
        * config/rs6000/{aix4,mh,aix4,mt,tm-rs6000-aix4.h}: New files
        specific to aix4 support on the rs6000.

        * config/rs6000/tm-rs6000.h (CONVERT_FROM_FUNC_PTR_ADDR): Don't
        do the conversion if the pointer is not a magic aix function
        pointer.
        * rs6000-tdep.c: Include objfiles.h and symtab.h.
        (is_magic_function_pointer): New function.

        * rs6000-tdep.c (skip_prologue): Refine check for frameless
        functions.  Handle b .+4 emitted by aix4 compilers.  Only
        allow one load of a minimal toc pointer.  Handle aix4 compiler's
        code for alloca.

        * rs6000-tdep.c (find_toc_address): Report an error if no toc was
        found rather than possibly core dumping.

        * partial-stab.h: Handle extra field generated by the aix4 compiler
        for enumerations.
        * stabsread.c (read_enum_type): Likewise.

4 files changed, 59 insertions, 0 deletions

diff --git a/gdb/config/rs6000/.Sanitize b/gdb/config/rs6000/.Sanitize
index 915bef5..26a1e74 100644
--- a/gdb/config/rs6000/.Sanitize
+++ b/gdb/config/rs6000/.Sanitize
@@ -21,6 +21,8 @@ Do-first:
 
 Things-to-keep:
 
+aix4.mh
+aix4.mt
 nm-rs6000.h
 nm-rs6000ly.h
 rs6000.mh
@@ -29,6 +31,7 @@ rs6000.mt
 rs6000lynx.mt
 tm-rs6000.h
 tm-rs6000ly.h
+tm-rs6000-aix4.h
 xm-rs6000.h
 xm-rs6000ly.h
 
diff --git a/gdb/config/rs6000/aix4.mh b/gdb/config/rs6000/aix4.mh
new file mode 100644
index 0000000..bb639f5
--- /dev/null
+++ b/gdb/config/rs6000/aix4.mh
@@ -0,0 +1,24 @@
+# Host: IBM RS/6000 running AIX4
+
+XM_FILE= xm-rs6000.h
+XDEPFILES= 
+
+NAT_FILE= nm-rs6000.h
+NATDEPFILES= fork-child.o infptrace.o inftarg.o corelow.o rs6000-nat.o xcoffread.o
+
+# When compiled with cc, for debugging, this argument should be passed.
+# We have no idea who our current compiler is though, so we skip it.
+# MH_CFLAGS = -bnodelcsect
+
+# Because of shared libraries, we risk ending up with *two*
+# incompatible versions of malloc if we use GNU malloc ...
+MMALLOC = 
+MMALLOC_DISABLE = -DNO_MMALLOC
+
+# A bug in the AIX 3.2 libc.a results in unresolved references for .scalb and
+# .finite because we call ldexp via floatformat.  Circumvent by adding -lm.
+XM_CLIBS= -lm
+
+# Rumor has it that libtermcap is "not really functional", and that
+# -lcurses is better.
+TERMCAP= -lcurses
diff --git a/gdb/config/rs6000/aix4.mt b/gdb/config/rs6000/aix4.mt
new file mode 100644
index 0000000..85ba547
--- /dev/null
+++ b/gdb/config/rs6000/aix4.mt
@@ -0,0 +1,3 @@
+# Target: IBM RS/6000 running AIX4
+TDEPFILES= rs6000-tdep.o xcoffsolib.o
+TM_FILE= tm-rs6000-aix4.h
diff --git a/gdb/config/rs6000/tm-rs6000-aix4.h b/gdb/config/rs6000/tm-rs6000-aix4.h
new file mode 100644
index 0000000..04f3344
--- /dev/null
+++ b/gdb/config/rs6000/tm-rs6000-aix4.h
@@ -0,0 +1,29 @@
+/* Macro definitions for RS/6000 running AIX4.
+   Copyright 1995 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+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.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef TM_RS6000_AIX4_H
+#define TM_RS6000_AIX4_H
+
+/* The main executable doesn't need relocation in aix4.  */
+#define DONT_RELOCATE_SYMFILE_OBJFILE
+
+/* Use generic RS6000 definitions. */
+#include "rs6000/tm-rs6000.h"
+
+#endif /* TM_RS6000_AIX4_H */