rs6000: add support for powerpc64le-unknown-freebsd

[Piotr Kubaj <pkubaj@anongoth.pl>]

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Hello,

this patch implements support for powerpc64le architecture on FreeBSD. Since we don't have powerpcle (32-bit), I did not add support for powerpcle here. This remains to be changed if there is powerpcle support in the future.

Patch implements similar endian detection to what linux64.h uses.

Would it be ok to backport it to at least GCC 10?

gcc/Changelog:
2020-12-14  Piotr Kubaj  <pkubaj@FreeBSD.org>

        * config.gcc: add support for powerpc64le-unknown-freebsd

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--- gcc/config.gcc.orig	2020-12-07 03:00:29 UTC
+++ gcc/config.gcc
@@ -2868,6 +2868,10 @@ powerpc*-*-freebsd*)
 	extra_options="${extra_options} rs6000/sysv4.opt"
 	tmake_file="rs6000/t-fprules rs6000/t-ppcos ${tmake_file} rs6000/t-ppccomm"
 	case ${target} in
+	    powerpc*le-*-*)
+		tm_file="${tm_file} rs6000/sysv4le.h" ;;
+	esac
+	case ${target} in
 	     powerpc64*)
 	    	tm_file="${tm_file} rs6000/default64.h rs6000/freebsd64.h"
 		tmake_file="${tmake_file} rs6000/t-freebsd64"
--- gcc/config/rs6000/freebsd64.h.orig	2020-07-23 06:35:17 UTC
+++ gcc/config/rs6000/freebsd64.h
@@ -158,8 +157,8 @@ extern int dot_symbols;
 #define ASM_SPEC64 "-a64"
 
 #define ASM_SPEC_COMMON "%(asm_cpu) \
-%{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
-%{mlittle} %{mlittle-endian} %{mbig} %{mbig-endian}"
+%{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
+  ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 
 #undef	SUBSUBTARGET_EXTRA_SPECS
 #define SUBSUBTARGET_EXTRA_SPECS					\
@@ -181,9 +180,15 @@ extern int dot_symbols;
     %{static:-Bstatic}} \
   %{symbolic:-Bsymbolic}"
 
+#undef  DEFAULT_ASM_ENDIAN
 #define LINK_OS_FREEBSD_SPEC32 "-melf32ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
-  
+#if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
+#define DEFAULT_ASM_ENDIAN " -mlittle"
+#define LINK_OS_FREEBSD_SPEC64 "-melf64lppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
+#else
+#define DEFAULT_ASM_ENDIAN " -mbig"
 #define LINK_OS_FREEBSD_SPEC64 "-melf64ppc_fbsd " LINK_OS_FREEBSD_SPEC_DEF
+#endif
 
 #undef	MULTILIB_DEFAULTS
 #define MULTILIB_DEFAULTS { "m64" }
--- gcc/configure.ac.orig	2020-12-14 15:22:23 UTC
+++ gcc/configure.ac
@@ -5874,6 +5874,8 @@ case "$target:$tm_file" in
      *-*-linux*)
      emul_name="-melf64ppc"
       ;;
+     *le-*-freebsd*)
+     emul_name="-melf64lppc_fbsd"
      *-*-freebsd*)
      emul_name="-melf64ppc_fbsd"
       ;;

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