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 --git a/libgcc/config.host b/libgcc/config.host
index d36f0e34a3b6d6b8476a31a84e134f873d00d4d8..92acdd0d4993740b425afd58491ac229ed6a66b4 100644 (file)
--- 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 (file)
index 0000000..a2fc5dd
--- /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 (file)
index 0000000..960bad7
--- /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 (file)
index 0000000..f29f40f
--- /dev/null
+++ b/libgcc/config/s390/t-softfp
@@ -0,0 +1 @@
+LIB2ADD += $(srcdir)/config/s390/sfp-exceptions.c