[PATCH] Add support for x86_64-*-gnu-* targets (gcc)

[Flavio Cruz]

---
This is the GCC patch for x86_64-pc-gnu triplet support. This is the basic
version without unwind support which I think is only required to
implement exceptions.

I'm looking for comments before sending it to the gcc mailing list.

 gcc/config.gcc                  |  4 ++++
 gcc/config/i386/gnu64.h         | 40 +++++++++++++++++++++++++++++++++
 libgcc/config.host              |  8 ++++++-
 libgcc/config/i386/gnu-unwind.h | 10 +++++++++
 4 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 gcc/config/i386/gnu64.h

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 95190233820..1d76fe98f96 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1955,6 +1955,10 @@ i[34567]86-*-linux* | i[34567]86-*-kfreebsd*-gnu | 
i[34567]86-*-gnu* | i[34567]8
                ;;
        esac
        ;;
+x86_64-*-gnu*)
+  tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h gnu-user.h 
glibc-stdint.h \
+     i386/x86-64.h i386/gnu-user-common.h i386/gnu-user64.h gnu.h i386/gnu64.h"
+  ;;
 x86_64-*-linux* | x86_64-*-kfreebsd*-gnu)
        tm_file="${tm_file} i386/unix.h i386/att.h elfos.h gnu-user.h 
glibc-stdint.h \
                 i386/x86-64.h i386/gnu-user-common.h i386/gnu-user64.h"
diff --git a/gcc/config/i386/gnu64.h b/gcc/config/i386/gnu64.h
new file mode 100644
index 00000000000..c764437cb67
--- /dev/null
+++ b/gcc/config/i386/gnu64.h
@@ -0,0 +1,40 @@
+/* Configuration for an i386 running GNU with ELF as the target machine.  */
+
+/*
+Copyright (C) 2022 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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 3 of the License, or
+(at your option) any later version.
+
+GCC 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 GCC.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define GNU_USER_LINK_EMULATION32 "elf_i386"
+#define GNU_USER_LINK_EMULATION64 "elf_x86_64"
+#define GNU_USER_LINK_EMULATIONX32 "elf32_x86_64"
+
+#undef GNU_USER_DYNAMIC_LINKER
+#define GNU_USER_DYNAMIC_LINKER32 "/lib/ld.so"
+#define GNU_USER_DYNAMIC_LINKER64 "/lib/ld-x86-64.so"
+#define GNU_USER_DYNAMIC_LINKERX32 "/lib/ld-x32.so"
+
+#undef STARTFILE_SPEC
+#if defined HAVE_LD_PIE
+#define STARTFILE_SPEC \
+  "%{!shared: 
%{pg|p|profile:%{static:gcrt0.o%s;:gcrt1.o%s};pie:Scrt1.o%s;static:crt0.o%s;:crt1.o%s}}
 \
+   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
+#else
+#define STARTFILE_SPEC \
+  "%{!shared: 
%{pg|p|profile:%{static:gcrt0.o%s;:gcrt1.o%s};static:crt0.o%s;:crt1.o%s}} \
+   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
+#endif
diff --git a/libgcc/config.host b/libgcc/config.host
index eb23abe89f5..38da43edfa6 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -740,6 +740,12 @@ i[34567]86-*-gnu*)
        tm_file="${tm_file} i386/elf-lib.h"
        md_unwind_header=i386/gnu-unwind.h
        ;;
+x86_64-*-gnu*)
+       extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o 
crtfastmath.o"
+       tmake_file="${tmake_file} i386/t-crtpc t-crtfm i386/t-crtstuff 
t-dfprules"
+       tm_file="${tm_file} i386/elf-lib.h"
+       md_unwind_header=i386/gnu-unwind.h
+       ;;
 x86_64-*-linux*)
        extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o 
crtfastmath.o"
        tmake_file="${tmake_file} i386/t-crtpc t-crtfm i386/t-crtstuff 
t-dfprules"
@@ -1523,7 +1529,7 @@ esac
 case ${host} in
 i[34567]86-*-linux* | x86_64-*-linux* | \
   i[34567]86-*-kfreebsd*-gnu | x86_64-*-kfreebsd*-gnu | \
-  i[34567]86-*-gnu*)
+  i[34567]86-*-gnu* | x86_64-*-gnu*)
        tmake_file="${tmake_file} t-tls i386/t-linux i386/t-msabi 
t-slibgcc-libgcc"
        if test "$libgcc_cv_cfi" = "yes"; then
                tmake_file="${tmake_file} t-stack i386/t-stack-i386"
diff --git a/libgcc/config/i386/gnu-unwind.h b/libgcc/config/i386/gnu-unwind.h
index 25eb690e370..b7574f9ac37 100644
--- a/libgcc/config/i386/gnu-unwind.h
+++ b/libgcc/config/i386/gnu-unwind.h
@@ -30,6 +30,14 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If 
not, see
 
 #include <signal.h>
 
+#ifdef __x86_64__
+
+/*
+ * TODO: support for 64 bits need to be implemented.
+ */
+
+#else /* ifdef __x86_64__  */
+
 #define MD_FALLBACK_FRAME_STATE_FOR x86_gnu_fallback_frame_state
 
 static _Unwind_Reason_Code
@@ -138,4 +146,6 @@ x86_gnu_fallback_frame_state
   return _URC_NO_REASON;
 }
 
+#endif /* ifdef __x86_64__  */
+
 #endif /* ifndef inhibit_libc */
-- 
2.37.2