sim: overhaul & unify endian settings management

The m4 macro has 2 args: the "wire" settings (which represents the
hardwired port behavior), and the default settings (which are used
if nothing else is specified).  If none are specified, the arch is
expected to support both, and the value will be probed based on the
user runtime options or the input program.

Only two arches today set the default value (bpf & mips).  We can
probably let this go as it only shows up in one scenario: the sim
is invoked, but with no inputs, and no user endian selection.  This
means bpf will not behave like the other arches: an error is shown
and forces the user to make a choice.  If an input program is used
though, we'll still switch the default to that.  This allows us to
remove the WITH_DEFAULT_TARGET_BYTE_ORDER setting.

For the ports that set a "wire" endian, move it to the runtime init
of the respective sim_open calls.  This allows us to change the
WITH_TARGET_BYTE_ORDER to purely a user-selected configure setting
if they want to force a specific endianness.

With all the endian logic moved to runtime selection, we can move
the configure call up to the common dir so we only process it once
across all ports.

The ppc arch was picking the wire endian based on the target used,
but since we weren't doing that for other biendian arches, we can
let this go too.  We'll rely on the input selecting the endian, or
make the user decide.

5 files changed, 11 insertions, 56 deletions

diff --git a/sim/cris/ChangeLog b/sim/cris/ChangeLog
index 2408419..61d064c 100644
--- a/sim/cris/ChangeLog
+++ b/sim/cris/ChangeLog
@@ -1,5 +1,11 @@
 2021-06-17  Mike Frysinger  <vapier@gentoo.org>
 
+	* configure.ac: Delete SIM_AC_OPTION_ENDIAN call.
+	* sim-if.c (sim_open): Set current_target_byte_order.
+	* aclocal.m4, configure: Regenerate.
+
+2021-06-17  Mike Frysinger  <vapier@gentoo.org>
+
 	* traps.c: Include sim/callback.h.
 
 2021-06-16  Mike Frysinger  <vapier@gentoo.org>
diff --git a/sim/cris/aclocal.m4 b/sim/cris/aclocal.m4
index 4fb0bd7..6129398 100644
--- a/sim/cris/aclocal.m4
+++ b/sim/cris/aclocal.m4
@@ -112,7 +112,6 @@ m4_include([../../lt~obsolete.m4])
 m4_include([../m4/sim_ac_common.m4])
 m4_include([../m4/sim_ac_option_cgen_maint.m4])
 m4_include([../m4/sim_ac_option_default_model.m4])
-m4_include([../m4/sim_ac_option_endian.m4])
 m4_include([../m4/sim_ac_option_hardware.m4])
 m4_include([../m4/sim_ac_option_inline.m4])
 m4_include([../m4/sim_ac_option_scache.m4])
diff --git a/sim/cris/configure b/sim/cris/configure
index 21171f0..cd6fe78 100755
--- a/sim/cris/configure
+++ b/sim/cris/configure
@@ -634,7 +634,6 @@ LIBOBJS
 sim_reserved_bits
 sim_float
 sim_bitsize
-sim_alignment
 cgen_breaks
 cgen
 cgendir
@@ -756,7 +755,6 @@ sim_inline
 sim_hw
 sim_hw_objs
 sim_hw_cflags
-sim_endian
 sim_default_model'
 ac_subst_files=''
 ac_user_opts='
@@ -771,7 +769,6 @@ with_gnu_ld
 enable_libtool_lock
 enable_maintainer_mode
 enable_sim_inline
-enable_sim_endian
 enable_sim_scache
 enable_werror
 enable_build_warnings
@@ -1417,8 +1414,6 @@ Optional Features:
                           sometimes confusing) to the casual installer
   --enable-sim-inline=inlines
                           Specify which functions should be inlined
-  --enable-sim-endian=endian
-                          Specify target byte endian orientation
   --enable-sim-scache=size
                           Specify simulator execution cache size
   --enable-werror         treat compile warnings as errors
@@ -10753,7 +10748,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10756 "configure"
+#line 10751 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10859,7 +10854,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10862 "configure"
+#line 10857 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11155,51 +11150,6 @@ fi
 
 
 
-wire_endian="LITTLE"
-default_endian=""
-# Check whether --enable-sim-endian was given.
-if test "${enable_sim_endian+set}" = set; then :
-  enableval=$enable_sim_endian; case "${enableval}" in
-  b*|B*) sim_endian="-DWITH_TARGET_BYTE_ORDER=BFD_ENDIAN_BIG";;
-  l*|L*) sim_endian="-DWITH_TARGET_BYTE_ORDER=BFD_ENDIAN_LITTLE";;
-  yes)	 if test x"$wire_endian" != x; then
-	   sim_endian="-DWITH_TARGET_BYTE_ORDER=BFD_ENDIAN_${wire_endian}"
-	 else
-	  if test x"$default_endian" != x; then
-	     sim_endian="-DWITH_TARGET_BYTE_ORDER=BFD_ENDIAN_${default_endian}"
-	   else
-	     echo "No hard-wired endian for target $target" 1>&6
-	     sim_endian="-DWITH_TARGET_BYTE_ORDER=BFD_ENDIAN_UNKNOWN"
-	   fi
-	 fi;;
-  no)	 if test x"$default_endian" != x; then
-	   sim_endian="-DWITH_DEFAULT_TARGET_BYTE_ORDER=BFD_ENDIAN_${default_endian}"
-	 else
-	   if test x"$wire_endian" != x; then
-	     sim_endian="-DWITH_DEFAULT_TARGET_BYTE_ORDER=BFD_ENDIAN_${wire_endian}"
-	   else
-	     echo "No default endian for target $target" 1>&6
-	     sim_endian="-DWITH_DEFAULT_TARGET_BYTE_ORDER=BFD_ENDIAN_UNKNOWN"
-	   fi
-	 fi;;
-  *)	 as_fn_error $? "\"Unknown value $enableval for --enable-sim-endian\"" "$LINENO" 5; sim_endian="";;
-esac
-if test x"$silent" != x"yes" && test x"$sim_endian" != x""; then
-  echo "Setting endian flags = $sim_endian" 6>&1
-fi
-else
-  if test x"$default_endian" != x; then
-  sim_endian="-DWITH_DEFAULT_TARGET_BYTE_ORDER=BFD_ENDIAN_${default_endian}"
-else
-  if test x"$wire_endian" != x; then
-    sim_endian="-DWITH_TARGET_BYTE_ORDER=BFD_ENDIAN_${wire_endian}"
-  else
-    sim_endian=
-  fi
-fi
-fi
-
-
 default_sim_scache="16384"
 # Check whether --enable-sim-scache was given.
 if test "${enable_sim_scache+set}" = set; then :
@@ -11490,8 +11440,6 @@ ac_config_commands="$ac_config_commands stamp-h"
 
 
 
-
-
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure
diff --git a/sim/cris/configure.ac b/sim/cris/configure.ac
index cc5bb49..48c4bbe 100644
--- a/sim/cris/configure.ac
+++ b/sim/cris/configure.ac
@@ -4,7 +4,6 @@ AC_CONFIG_MACRO_DIRS([../m4 ../.. ../../config])
 
 SIM_AC_COMMON
 
-SIM_AC_OPTION_ENDIAN(LITTLE)
 SIM_AC_OPTION_SCACHE(16384)
 SIM_AC_OPTION_WARNINGS(no)
 SIM_AC_OPTION_HARDWARE(rv cris cris_900000xx)
diff --git a/sim/cris/sim-if.c b/sim/cris/sim-if.c
index c6dcc23..c183856 100644
--- a/sim/cris/sim-if.c
+++ b/sim/cris/sim-if.c
@@ -654,6 +654,9 @@ sim_open (SIM_OPEN_KIND kind, host_callback *callback, struct bfd *abfd,
      standard ;-) that the rest of the elements won't be initialized.  */
   bfd_byte sp_init[4] = {0, 0, 0, 0};
 
+  /* Set default options before parsing user options.  */
+  current_target_byte_order = BFD_ENDIAN_LITTLE;
+
   /* The cpu data is kept in a separately allocated chunk of memory.  */
   if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK)
     {