Date: Thu, 23 May 2019 14:17:15 -0700 From: Mark Millard <marklmi@yahoo.com> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>, ports-list freebsd <freebsd-ports@freebsd.org> Cc: Jan Beich <jbeich@FreeBSD.org> Subject: Re: powerpc64 context: x11-toolkits/qt5-declarative fails to build in poudriere: /usr/local/lib/qt5/bin/qlalr segmentation faults in std::type_info::~type_info() () from /usr/local/lib/gcc8/libstdc++.so.6 Message-ID: <22D9DF10-E58A-49E5-8372-CC9D263A7C76@yahoo.com> In-Reply-To: <590AAD80-8D2F-4F7A-8910-001D72A5E666@yahoo.com> References: <8B8355C5-731B-4F03-AA98-11324C618D3C@yahoo.com> <590AAD80-8D2F-4F7A-8910-001D72A5E666@yahoo.com>
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[It looks like code generation missed a level of indirection
to me.]
> On 2019-May-23, at 13:46, Mark Millard <marklmi at yahoo.com> wrote:
>=20
> [I should have listed uname -apKU output and such.]
>=20
> On 2019-May-23, at 13:21, Mark Millard <marklmi@yahoo.com> wrote:
>=20
>> The poudriere bulk run that tried to build =
x11-toolkits/qt5-declarative
>> got:
>>=20
>> --- qqmljsgrammar.cpp ---
>> /usr/local/lib/qt5/bin/qlalr --no-debug --qt parser/qqmljs.g
>> Segmentation fault (core dumped)
>> *** [qqmljsgrammar.cpp] Error code 139
>>=20
>> make[3]: stopped in =
/wrkdirs/usr/ports/x11-toolkits/qt5-declarative/work/qtdeclarative-everywh=
ere-src-5.12.2/src/qml
>> 1 error
>>=20
>> Installing qt5-core and manually running under gdb from
>> an expansion of the bulk's tar of the failure, I was able
>> to get a backtrace:
>>=20
>> (gdb) run --no-debug --qt parser/qqmljs.g
>> Starting program: /usr/local/bin/qlalr --no-debug --qt =
parser/qqmljs.g
>> process 26823 is executing new program: /usr/local/lib/qt5/bin/qlalr
>> . . . (text about auto-loading has been declined and such) . . .
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x0000000810a96be0 in std::type_info::~type_info() () from =
/usr/local/lib/gcc8/libstdc++.so.6
>> (gdb) bt
>> #0 0x0000000810a96be0 in std::type_info::~type_info() () from =
/usr/local/lib/gcc8/libstdc++.so.6
>> #1 0x000000081092152c in __cxxabiv1::__dynamic_cast =
(src_ptr=3D0x810ab57d0 <(anonymous namespace)::ctype_c>, =
src_type=3D0x810a8eaa0 <typeinfo for std::locale::facet>,=20
>> dst_type=3D0x810a8fb18 <typeinfo for std::ctype<char>>, src2dst=3D0) =
at =
/wrkdirs/usr/ports/lang/gcc8/work/gcc-8.3.0/libstdc++-v3/libsupc++/dyncast=
.cc:71
>> #2 0x00000008109df908 in std::has_facet<std::ctype<char> > =
(__loc=3D...) at =
/wrkdirs/usr/ports/lang/gcc8/work/.build/powerpc64-portbld-freebsd13.0/lib=
stdc++-v3/include/bits/locale_classes.tcc:104
>> #3 0x00000008109cb474 in std::basic_ios<char, std::char_traits<char> =
>::_M_cache_locale (this=3D0x810ab48c8 <std::cout+8>, __loc=3D...)
>> at =
/wrkdirs/usr/ports/lang/gcc8/work/.build/powerpc64-portbld-freebsd13.0/lib=
stdc++-v3/include/bits/basic_ios.tcc:157
>> #4 0x00000008109cbad0 in std::basic_ios<char, std::char_traits<char> =
>::init (this=3D0x810ab48c8 <std::cout+8>, __sb=3D0x810ab36f8 =
<__gnu_internal::buf_cout_sync>)
>> at =
/wrkdirs/usr/ports/lang/gcc8/work/.build/powerpc64-portbld-freebsd13.0/lib=
stdc++-v3/include/bits/basic_ios.tcc:126
>> #5 0x000000081093e644 in std::basic_ostream<char, =
std::char_traits<char> >::basic_ostream (__sb=3D<optimized out>, =
this=3D<optimized out>, __in_chrg=3D<optimized out>, =
__vtt_parm=3D<optimized out>)
>> at =
/wrkdirs/usr/ports/lang/gcc8/work/.build/powerpc64-portbld-freebsd13.0/lib=
stdc++-v3/include/bits/basic_ios.h:460
>> #6 std::ios_base::Init::Init (this=3D<optimized out>) at =
/wrkdirs/usr/ports/lang/gcc8/work/gcc-8.3.0/libstdc++-v3/src/c++98/ios_ini=
t.cc:91
>> #7 std::ios_base::Init::Init (this=3D<optimized out>) at =
/wrkdirs/usr/ports/lang/gcc8/work/gcc-8.3.0/libstdc++-v3/src/c++98/ios_ini=
t.cc:78
>> #8 0x000000001000334c in __static_initialization_and_destruction_0 =
(__initialize_p=3D__initialize_p@entry=3D1, __priority=3D<optimized =
out>, __priority@entry=3D65535) at compress.cpp:273
>> #9 0x0000000010004c2c in _GLOBAL__sub_I_compress.cpp(void) () at =
compress.cpp:273
>> #10 0x000000081005dfa0 in objlist_call_init (list=3D<optimized out>, =
lockstate=3D<optimized out>) at /usr/src/libexec/rtld-elf/rtld.c:2728
>> #11 0x000000081005c830 in _rtld (sp=3D<optimized out>, =
exit_proc=3D<optimized out>, objp=3D<optimized out>) at =
/usr/src/libexec/rtld-elf/rtld.c:765
>> #12 0x000000081005a240 in ._rtld_start () at =
/usr/src/libexec/rtld-elf/powerpc64/rtld_start.S:83
>> Backtrace stopped: frame did not save the PC
>>=20
>>=20
>>=20
>> NOTE: In order to have built devel/qt5-core I used a patch
>> to make sure that all the %%LOCALBASE%% strings were replaced
>> (otherwise in the powerpc64 system clang 8 based world the
>> devel/qt5-core build failed from -I%%LOCALBASE%%... use):
>>=20
>> Index: /usr/ports/Mk/Uses/qt-dist.mk
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> --- /usr/ports/Mk/Uses/qt-dist.mk (revision 501994)
>> +++ /usr/ports/Mk/Uses/qt-dist.mk (working copy)
>> @@ -251,7 +251,7 @@
>> .if ${_QT_VER:M5}
>> post-patch: gcc-post-patch
>> gcc-post-patch:
>> - ${REINPLACE_CMD} 's|%%LOCALBASE%%|${LOCALBASE}|' \
>> + ${REINPLACE_CMD} 's|%%LOCALBASE%%|${LOCALBASE}|g' \
>> ${WRKSRC}/mkspecs/common/gcc-base.conf \
>> ${WRKSRC}/mkspecs/freebsd-g++/qmake.conf
>> ${REINPLACE_CMD} 's|%%GCC_DEFAULT%%|${GCC_DEFAULT}|g' \
>> @@ -298,7 +298,7 @@
>> # ports/194088.
>> post-patch: qtbase-post-patch
>> qtbase-post-patch:
>> - ${REINPLACE_CMD} -e 's|%%LOCALBASE%%|${LOCALBASE}|g' \
>> + ${REINPLACE_CMD} 's|%%LOCALBASE%%|${LOCALBASE}|g' \
>> ${WRKSRC}/mkspecs/common/bsd/bsd.conf \
>> ${WRKSRC}/mkspecs/freebsd-clang/qmake.conf
>>=20
>>=20
>> (So having the missing g added but not having the optional -e
>> usage in the other %%LOCALBASE%% related command. The -e
>> status is optional here: only one command to sed sed command
>> in each sed command. The additional g is the important part.)
>=20
> I should have listed:
>=20
> # uname -apKU
> FreeBSD FBSDG5L 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r347549M: Wed May =
22 15:14:43 PDT 2019 =
markmi@FBSDG5L:/usr/obj/powerpc64vtsc_clang_altbinutils/powerpc.powerpc64/=
usr/src/powerpc.powerpc64/sys/GENERIC64vtsc-NODBG powerpc powerpc64 =
1300025 1300025
>=20
> # svnlite info /usr/ports/ | grep 'Re[plv]' | more
> Relative URL: ^/head
> Repository Root: svn://svn0.us-west.freebsd.org/ports
> Repository UUID: 35697150-7ecd-e111-bb59-0022644237b5
> Revision: 501994
> Last Changed Rev: 501994
>=20
>=20
> As part of experimenting with a system clang 8 based world
> context:
>=20
> # svnlite diff /usr/ports/devel/binutils/Makefile
> Index: /usr/ports/devel/binutils/Makefile
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- /usr/ports/devel/binutils/Makefile (revision 501994)
> +++ /usr/ports/devel/binutils/Makefile (working copy)
> @@ -3,6 +3,7 @@
>=20
> PORTNAME=3D binutils
> PORTVERSION=3D 2.32
> +PORTREVISION=3D 1
> PORTEPOCH?=3D 1
> CATEGORIES?=3D devel
> MASTER_SITES=3D SOURCEWARE/binutils/releases
> @@ -13,7 +14,6 @@
> LICENSE=3D GPLv3 LGPL3
> LICENSE_COMB=3D multi
>=20
> -EXTRA_PATCHES=3D =
${FILESDIR}/binutils-do-not-provide-shared-section-symbols.patch:-p1
> .if defined(PREFIX) && ${PREFIX} !=3D "/usr"
> BUILD_DEPENDS=3D ${LOCALBASE}/lib/libgmp.so:math/gmp \
> ${LOCALBASE}/lib/libmpfr.so:math/mpfr
>=20
>=20
> # svnlite diff /usr/ports/lang/gcc8/Makefile
> Index: /usr/ports/lang/gcc8/Makefile
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- /usr/ports/lang/gcc8/Makefile (revision 501994)
> +++ /usr/ports/lang/gcc8/Makefile (working copy)
> @@ -62,7 +62,7 @@
>=20
> .elif ${ARCH} =3D=3D powerpc64
> CONFIGURE_ENV+=3D UNAME_m=3D"powerpc64"
> -MAKE_ARGS+=3D CFLAGS_FOR_TARGET=3D"-O1" =
CXXFLAGS_FOR_TARGET=3D"-O1" BOOT_CFLAGS=3D"-O1" # PR235975
> +#MAKE_ARGS+=3D CFLAGS_FOR_TARGET=3D"-O1" =
CXXFLAGS_FOR_TARGET=3D"-O1" BOOT_CFLAGS=3D"-O1" # PR235975
>=20
> .elif ${ARCH} =3D=3D powerpcspe
> CONFIGURE_ARGS+=3D --with-cpu=3D8548 --enable-e500_double =
--without-fp
> @@ -80,7 +80,7 @@
> CONFIGURE_ARGS+=3D--with-build-config=3Dbootstrap-debug
> ALL_TARGET=3D bootstrap-lean
> .endif
> -INSTALL_TARGET=3D install-strip
> +#INSTALL_TARGET=3D install-strip
> .if ${UID} !=3D 0
> BINMODE=3D 755
> .endif
>=20
> I had to work around clang reserving "vec_step" as a name
> in contexts where the gcc8 source code used that name:
> (vec_step is associated with support of the the vector
> instructions on powerpc64.)
>=20
> # more /usr/ports/lang/gcc8/files/patch-gcc_tree-vect-loop.c
> --- gcc/tree-vect-loop.c.orig 2018-10-10 22:41:40.295753000 -0700
> +++ gcc/tree-vect-loop.c 2018-10-10 22:57:44.698855000 -0700
> @@ -4970,13 +4970,13 @@
>=20
> /* Create a vector of the step value. */
> tree step =3D build_int_cst (cr_index_scalar_type, nunits_out);
> - tree vec_step =3D build_vector_from_val (cr_index_vector_type, =
step);
> + tree vec_step_renamed =3D build_vector_from_val =
(cr_index_vector_type, step);
>=20
> /* Create an induction variable. */
> gimple_stmt_iterator incr_gsi;
> bool insert_after;
> standard_iv_increment_position (loop, &incr_gsi, &insert_after);
> - create_iv (series_vect, vec_step, NULL_TREE, loop, &incr_gsi,
> + create_iv (series_vect, vec_step_renamed, NULL_TREE, loop, =
&incr_gsi,
> insert_after, &indx_before_incr, &indx_after_incr);
>=20
> /* Next create a new phi node vector (NEW_PHI_TREE) which starts
> @@ -7641,7 +7641,7 @@
> tree vec_def;
> edge pe =3D loop_preheader_edge (loop);
> basic_block new_bb;
> - tree new_vec, vec_init, vec_step, t;
> + tree new_vec, vec_init, vec_step_renamed, t;
> tree new_name;
> gimple *new_stmt;
> gphi *induction_phi;
> @@ -7834,7 +7834,7 @@
> new_name =3D vect_init_vector (phi, new_name,
> TREE_TYPE (step_expr), NULL);
> new_vec =3D build_vector_from_val (vectype, new_name);
> - vec_step =3D vect_init_vector (phi, new_vec, vectype, NULL);
> + vec_step_renamed =3D vect_init_vector (phi, new_vec, vectype, =
NULL);
>=20
> /* Now generate the IVs. */
> unsigned group_size =3D SLP_TREE_SCALAR_STMTS (slp_node).length =
();
> @@ -7873,7 +7873,7 @@
>=20
> /* Create the iv update inside the loop */
> vec_def =3D make_ssa_name (vec_dest);
> - new_stmt =3D gimple_build_assign (vec_def, PLUS_EXPR, =
induc_def, vec_step);
> + new_stmt =3D gimple_build_assign (vec_def, PLUS_EXPR, =
induc_def, vec_step_renamed);
> gsi_insert_before (&si, new_stmt, GSI_SAME_STMT);
> set_vinfo_for_stmt (new_stmt, new_stmt_vec_info (new_stmt, =
loop_vinfo));
>=20
> @@ -7904,7 +7904,7 @@
> new_name =3D vect_init_vector (phi, new_name,
> TREE_TYPE (step_expr), NULL);
> new_vec =3D build_vector_from_val (vectype, new_name);
> - vec_step =3D vect_init_vector (phi, new_vec, vectype, NULL);
> + vec_step_renamed =3D vect_init_vector (phi, new_vec, =
vectype, NULL);
> for (; ivn < nvects; ++ivn)
> {
> gimple *iv =3D SLP_TREE_VEC_STMTS (slp_node)[ivn - nivs];
> @@ -7915,7 +7915,7 @@
> def =3D gimple_assign_lhs (iv);
> new_stmt =3D gimple_build_assign (make_ssa_name =
(vectype),
> PLUS_EXPR,
> - def, vec_step);
> + def, vec_step_renamed);
> if (gimple_code (iv) =3D=3D GIMPLE_PHI)
> gsi_insert_before (&si, new_stmt, GSI_SAME_STMT);
> else
> @@ -8041,7 +8041,7 @@
> gcc_assert (CONSTANT_CLASS_P (new_name)
> || TREE_CODE (new_name) =3D=3D SSA_NAME);
> new_vec =3D build_vector_from_val (vectype, t);
> - vec_step =3D vect_init_vector (phi, new_vec, vectype, NULL);
> + vec_step_renamed =3D vect_init_vector (phi, new_vec, vectype, =
NULL);
>=20
>=20
> /* Create the following def-use cycle:
> @@ -8064,7 +8064,7 @@
>=20
> /* Create the iv update inside the loop */
> vec_def =3D make_ssa_name (vec_dest);
> - new_stmt =3D gimple_build_assign (vec_def, PLUS_EXPR, induc_def, =
vec_step);
> + new_stmt =3D gimple_build_assign (vec_def, PLUS_EXPR, induc_def, =
vec_step_renamed);
> gsi_insert_before (&si, new_stmt, GSI_SAME_STMT);
> set_vinfo_for_stmt (new_stmt, new_stmt_vec_info (new_stmt, =
loop_vinfo));
>=20
> @@ -8108,7 +8108,7 @@
> gcc_assert (CONSTANT_CLASS_P (new_name)
> || TREE_CODE (new_name) =3D=3D SSA_NAME);
> new_vec =3D build_vector_from_val (vectype, t);
> - vec_step =3D vect_init_vector (phi, new_vec, vectype, NULL);
> + vec_step_renamed =3D vect_init_vector (phi, new_vec, vectype, =
NULL);
>=20
> vec_def =3D induc_def;
> prev_stmt_vinfo =3D vinfo_for_stmt (induction_phi);
> @@ -8116,7 +8116,7 @@
> {
> /* vec_i =3D vec_prev + vec_step */
> new_stmt =3D gimple_build_assign (vec_dest, PLUS_EXPR,
> - vec_def, vec_step);
> + vec_def, vec_step_renamed);
> vec_def =3D make_ssa_name (vec_dest, new_stmt);
> gimple_assign_set_lhs (new_stmt, vec_def);
>=20
>=20
> # svnlite diff /usr/ports/devel/libunwind/Makefile
> Index: /usr/ports/devel/libunwind/Makefile
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- /usr/ports/devel/libunwind/Makefile (revision 501994)
> +++ /usr/ports/devel/libunwind/Makefile (working copy)
> @@ -22,6 +22,8 @@
>=20
> USES=3D libtool pathfix pkgconfig
> USE_LDCONFIG=3D yes
> +CFLAGS+=3D -fPIC
> +
> GNU_CONFIGURE=3D yes
> INSTALL_TARGET=3D install-strip
> LLD_UNSAFE=3D yes
>=20
>=20
>=20
> I do use an ALLOW_OPTIMIZATIONS_FOR_WITH_DEBUG change to
> bsd.port.mk (ignore the OPSYS and _OSRELEASE inline
> substitutions):
>=20
> # svnlite diff /usr/ports/Mk/bsd.port.mk
> Index: /usr/ports/Mk/bsd.port.mk
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- /usr/ports/Mk/bsd.port.mk (revision 501994)
> +++ /usr/ports/Mk/bsd.port.mk (working copy)
> @@ -1151,12 +1151,12 @@
>=20
> # Get the operating system type
> .if !defined(OPSYS)
> -OPSYS!=3D ${UNAME} -s
> +OPSYS!=3D echo FreeBSD
> .endif
> _EXPORTED_VARS+=3D OPSYS
>=20
> .if !defined(_OSRELEASE)
> -_OSRELEASE!=3D ${UNAME} -r
> +_OSRELEASE!=3D echo 13.0-CURRENT
> .endif
> _EXPORTED_VARS+=3D _OSRELEASE
>=20
> @@ -1762,7 +1762,11 @@
> STRIP_CMD=3D ${TRUE}
> .endif
> DEBUG_FLAGS?=3D -g
> +.if defined(ALLOW_OPTIMIZATIONS_FOR_WITH_DEBUG)
> +CFLAGS:=3D ${CFLAGS} ${DEBUG_FLAGS}
> +.else
> CFLAGS:=3D ${CFLAGS:N-O*:N-fno-strict*} ${DEBUG_FLAGS}
> +.endif
> .if defined(INSTALL_TARGET)
> INSTALL_TARGET:=3D ${INSTALL_TARGET:S/^install-strip$/install/g}
> .endif
>=20
>=20
> (I once had a context where the ${UNAME} -s and ${UNAME} -r
> lines each ended up with empty strings assigned. The echo's
> just worked around the problem. I've no clue if I'd still
> have the problem.)
Program received signal SIGSEGV, Segmentation fault.
0x0000000810a96be0 in std::type_info::~type_info() () from =
/usr/local/lib/gcc8/libstdc++.so.6
(gdb) disass
Dump of assembler code for function _ZNSt9type_infoD2Ev:
=3D> 0x0000000810a96be0 <+0>: .long 0x8
0x0000000810a96be4 <+4>: .long 0x109273d0
0x0000000810a96be8 <+8>: .long 0x8
0x0000000810a96bec <+12>: vsubuqm v5,v11,v7
End of assembler dump.
Note that for the 0x8'1092'73d0 from the +0 and +4:
(gdb) disass 0x8109273d0
Dump of assembler code for function std::type_info::~type_info():
0x00000008109273d0 <+0>: blr
0x00000008109273d4 <+4>: .long 0x0
0x00000008109273d8 <+8>: .long 0x90000
0x00000008109273dc <+12>: .long 0x0
End of assembler dump.
And the code that got to 0x810a96be0 was:
(gdb) disass
Dump of assembler code for function __cxxabiv1::__dynamic_cast(void =
const*, __cxxabiv1::__class_type_info const*, =
__cxxabiv1::__class_type_info const*, ptrdiff_t):
. . .
0x0000000810921518 <+136>: ld r0,0(r12)
0x000000081092151c <+140>: ld r11,16(r12)
0x0000000810921520 <+144>: mtctr r0
0x0000000810921524 <+148>: ld r2,8(r12)
0x0000000810921528 <+152>: bctrl
=3D> 0x000000081092152c <+156>: ld r2,40(r1)
. . .
with ctr holding: 0x810a96be0
(gdb) info reg
. . .
pc 0x81092152c 0x81092152c =
<__cxxabiv1::__dynamic_cast(void const*, __cxxabiv1::__class_type_info =
const*, __cxxabiv1::__class_type_info const*, ptrdiff_t)+156>
. . .
lr 0x81092152c 0x81092152c =
<__cxxabiv1::__dynamic_cast(void const*, __cxxabiv1::__class_type_info =
const*, __cxxabiv1::__class_type_info const*, ptrdiff_t)+156>
ctr 0x810a96be0 34639277024
. . .
It looks to me like:
0x0000000810921518 <+136>: ld r0,0(r12)
0x000000081092151c <+140>: ld r11,16(r12)
0x0000000810921520 <+144>: mtctr r0
0x0000000810921524 <+148>: ld r2,8(r12)
0x0000000810921528 <+152>: bctrl
needed something like another instruction to get
the correct address into ctr for the later bctrl
use:=20
ld r0,0(r12)
ld r11,16(r12)
ld r0,0(r0) # <<=3D=3D=3D Needed?
mtctr r0
ld r2,8(r12)
bctrl
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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