SH: Use softfp for sh-elf

libgcc/ChangeLog:

	PR target/29845
	* config.host (sh-*-elf*): Replace fdpbit with softfp.
	* config/sh/sfp-machine.h: New file.

Signed-off-by: Sébastien Michelland <sebastien.michelland@lcis.grenoble-inp.fr>

2 files changed, 84 insertions, 1 deletions

diff --git a/libgcc/config.host b/libgcc/config.host
index fa001c5..06fae15 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -1414,7 +1414,7 @@ s390x-ibm-tpf*)
 	md_unwind_header=s390/tpf-unwind.h
 	;;
 sh-*-elf* | sh[12346l]*-*-elf*)
-	tmake_file="$tmake_file sh/t-sh t-crtstuff-pic t-fdpbit"
+	tmake_file="$tmake_file sh/t-sh t-crtstuff-pic t-softfp-sfdf t-softfp"
 	extra_parts="$extra_parts crt1.o crti.o crtn.o crtbeginS.o crtendS.o \
 		libic_invalidate_array_4-100.a \
 		libic_invalidate_array_4-200.a \
diff --git a/libgcc/config/sh/sfp-machine.h b/libgcc/config/sh/sfp-machine.h
new file mode 100644
index 0000000..26f6516
--- /dev/null
+++ b/libgcc/config/sh/sfp-machine.h
@@ -0,0 +1,83 @@
+/* Software floating-point machine description for SuperH.
+
+Copyright (C) 2024 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, 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#define _FP_W_TYPE_SIZE	32
+#define _FP_W_TYPE	unsigned long
+#define _FP_WS_TYPE	signed long
+#define _FP_I_TYPE	long
+
+#define _FP_MUL_MEAT_S(R,X,Y) \
+  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_D(R,X,Y) \
+  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_Q(R,X,Y) \
+  _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R,X,Y)	_FP_DIV_MEAT_1_udiv_norm(S,R,X,Y)
+#define _FP_DIV_MEAT_D(R,X,Y)	_FP_DIV_MEAT_2_udiv(D,R,X,Y)
+#define _FP_DIV_MEAT_Q(R,X,Y)	_FP_DIV_MEAT_4_udiv(Q,R,X,Y)
+
+#define _FP_NANFRAC_B	_FP_QNANBIT_B
+#define _FP_NANFRAC_H	_FP_QNANBIT_H
+#define _FP_NANFRAC_S	_FP_QNANBIT_S
+#define _FP_NANFRAC_D	_FP_QNANBIT_D, 0
+#define _FP_NANFRAC_Q	_FP_QNANBIT_Q, 0, 0, 0
+
+/* The type of the result of a floating point comparison.  This must
+   match __libgcc_cmp_return__ in GCC for the target.  */
+typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
+#define CMPtype __gcc_CMPtype
+
+#define _FP_NANSIGN_B	0
+#define _FP_NANSIGN_H	0
+#define _FP_NANSIGN_S	0
+#define _FP_NANSIGN_D	0
+#define _FP_NANSIGN_Q	0
+
+#define _FP_KEEPNANFRACP 0
+#define _FP_QNANNEGATEDP 0
+
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)  \
+  do {                      \
+    R##_s = _FP_NANSIGN_##fs;           \
+    _FP_FRAC_SET_##wc(R,_FP_NANFRAC_##fs);  \
+    R##_c = FP_CLS_NAN;             \
+  } while (0)
+
+#define _FP_TININESS_AFTER_ROUNDING 1
+
+#define __LITTLE_ENDIAN 1234
+#define __BIG_ENDIAN    4321
+
+#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#define __BYTE_ORDER __BIG_ENDIAN
+#else
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
+
+/* Define ALIASNAME as a strong alias for NAME.  */
+# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
+# define _strong_alias(name, aliasname) \
+  extern __typeof (name) aliasname __attribute__ ((alias (#name)));