https://gcc.gnu.org/g:872b002b9f2cb9d726137062147951d84c67f02f
commit r16-3057-g872b002b9f2cb9d726137062147951d84c67f02f
Author: Stefan Schulze Frielinghaus <stefa...@gcc.gnu.org>
Date: Thu Aug 7 08:39:11 2025 +0200
s390: libgcc: Enable soft-fp
Enable soft-fp for -m64 only.
libgcc/ChangeLog:
* config.host: Include makefiles t-softfp for -m64.
* config/s390/sfp-exceptions.c: New file.
* config/s390/sfp-machine.h: New file.
* config/s390/t-softfp: New file.
Diff:
---
libgcc/config.host | 2 +
libgcc/config/s390/sfp-exceptions.c | 61 +++++++++++++++++++++++++
libgcc/config/s390/sfp-machine.h | 89 +++++++++++++++++++++++++++++++++++++
libgcc/config/s390/t-softfp | 1 +
4 files changed, 153 insertions(+)
diff --git a/libgcc/config.host b/libgcc/config.host
index d36f0e34a3b6..92acdd0d4993 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -1397,6 +1397,8 @@ s390x-*-linux*)
tmake_file="${tmake_file} s390/t-crtstuff s390/t-linux t-stack
s390/t-stack-s390"
if test "${host_address}" = 32; then
tmake_file="${tmake_file} s390/32/t-floattodi"
+ else
+ tmake_file="${tmake_file} s390/t-softfp t-softfp"
fi
md_unwind_header=s390/linux-unwind.h
;;
diff --git a/libgcc/config/s390/sfp-exceptions.c
b/libgcc/config/s390/sfp-exceptions.c
new file mode 100644
index 000000000000..a2fc5dd40af0
--- /dev/null
+++ b/libgcc/config/s390/sfp-exceptions.c
@@ -0,0 +1,61 @@
+/* Copyright (C) 2001-2025 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/>. */
+
+#include "sfp-machine.h"
+
+#define __math_force_eval_div(x, y) \
+ do { asm ("" : "+f" (x)); asm volatile ("" : : "f" (x / y)); } while (0)
+
+void
+__sfp_handle_exceptions (int _fex)
+{
+ if (_fex & FP_EX_INVALID)
+ {
+ float x = 0.0f;
+ __math_force_eval_div (x, x);
+ }
+ if (_fex & FP_EX_DIVZERO)
+ {
+ float x = 1.0f;
+ float y = 0.0f;
+ __math_force_eval_div (x, y);
+ }
+ if (_fex & FP_EX_OVERFLOW)
+ {
+ float x = __FLT_MAX__;
+ asm ("" : "+f" (x));
+ asm volatile ("" : : "f" (x + x));
+ }
+ if (_fex & FP_EX_UNDERFLOW)
+ {
+ float x = __FLT_MIN__;
+ asm ("" : "+f" (x));
+ asm volatile ("" : : "f" (x * x));
+ }
+ if (_fex & FP_EX_INEXACT)
+ {
+ float x = 1.0f;
+ float y = 3.0f;
+ __math_force_eval_div (x, y);
+ }
+}
diff --git a/libgcc/config/s390/sfp-machine.h b/libgcc/config/s390/sfp-machine.h
new file mode 100644
index 000000000000..960bad7dcc5a
--- /dev/null
+++ b/libgcc/config/s390/sfp-machine.h
@@ -0,0 +1,89 @@
+/* Copyright (C) 2001-2025 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/>. */
+
+#if ! __s390x__
+# error "soft-fp implemented for s390x only"
+#endif
+
+#define _FP_W_TYPE_SIZE 64
+#define _FP_W_TYPE unsigned long long
+#define _FP_WS_TYPE signed long long
+#define _FP_I_TYPE long long
+
+typedef int TItype __attribute__ ((mode (TI)));
+typedef unsigned int UTItype __attribute__ ((mode (TI)));
+#define TI_BITS (__CHAR_BIT__ * (int) sizeof (TItype))
+
+#define _FP_NANFRAC_H ((_FP_QNANBIT_H << 1) - 1)
+#define _FP_NANFRAC_S ((_FP_QNANBIT_S << 1) - 1)
+#define _FP_NANFRAC_D ((_FP_QNANBIT_D << 1) - 1)
+#define _FP_NANFRAC_Q ((_FP_QNANBIT_Q << 1) - 1), -1
+
+#define _FP_NANSIGN_H 0
+#define _FP_NANSIGN_S 0
+#define _FP_NANSIGN_D 0
+#define _FP_NANSIGN_Q 0
+
+#define _FP_KEEPNANFRACP 1
+#define _FP_QNANNEGATEDP 0
+
+#define FP_EX_INVALID 0x01
+#define FP_EX_DIVZERO 0x02
+#define FP_EX_OVERFLOW 0x04
+#define FP_EX_UNDERFLOW 0x08
+#define FP_EX_INEXACT 0x10
+#define FP_EX_ALL \
+ (FP_EX_INVALID | FP_EX_DIVZERO | FP_EX_OVERFLOW \
+ | FP_EX_UNDERFLOW | FP_EX_INEXACT)
+
+void __sfp_handle_exceptions (int);
+
+#define FP_HANDLE_EXCEPTIONS \
+ do { \
+ if (__builtin_expect (_fex, 0)) \
+ __sfp_handle_exceptions (_fex); \
+ } while (0)
+
+#define _FP_TININESS_AFTER_ROUNDING 0
+
+#define FP_RND_NEAREST 0x0
+#define FP_RND_ZERO 0x1
+#define FP_RND_PINF 0x2
+#define FP_RND_MINF 0x3
+#define FP_RND_MASK 0x3
+
+#define _FP_DECL_EX \
+ unsigned int _fpcr __attribute__ ((unused)) = FP_RND_NEAREST
+
+#define FP_INIT_ROUNDMODE \
+ do { \
+ __asm__ __volatile__ ("stfpc %0" \
+ : "=m" (_fpcr)); \
+ } while (0)
+
+#define FP_ROUNDMODE (_fpcr & FP_RND_MASK)
+
+#define __LITTLE_ENDIAN 1234
+#define __BIG_ENDIAN 4321
+
+#define __BYTE_ORDER __BIG_ENDIAN
diff --git a/libgcc/config/s390/t-softfp b/libgcc/config/s390/t-softfp
new file mode 100644
index 000000000000..f29f40f2cedc
--- /dev/null
+++ b/libgcc/config/s390/t-softfp
@@ -0,0 +1 @@
+LIB2ADD += $(srcdir)/config/s390/sfp-exceptions.c
