131 lines
4.5 KiB
Diff
131 lines
4.5 KiB
Diff
Only in old: build.patch
|
|
--- old/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
|
|
+++ new/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp
|
|
@@ -88,6 +88,126 @@
|
|
#define SPELL_REG_FP "ebp"
|
|
#endif // AMD64
|
|
|
|
+// ==============================================================================
|
|
+// Taken from glibc 2.28
|
|
+// source: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86/fpu_control.h;h=4cb98c5679b2897ff4e5826d228cba6be589e24d;hb=3c03baca37fdcb52c3881e653ca392bba7a99c2b
|
|
+// ==============================================================================
|
|
+#ifndef AMD64
|
|
+/* FPU control word bits. x86 version.
|
|
+ Copyright (C) 1993-2018 Free Software Foundation, Inc.
|
|
+ This file is part of the GNU C Library.
|
|
+ Contributed by Olaf Flebbe.
|
|
+
|
|
+ The GNU C Library is free software; you can redistribute it and/or
|
|
+ modify it under the terms of the GNU Lesser General Public
|
|
+ License as published by the Free Software Foundation; either
|
|
+ version 2.1 of the License, or (at your option) any later version.
|
|
+
|
|
+ The GNU C Library 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
|
|
+ Lesser General Public License for more details.
|
|
+
|
|
+ You should have received a copy of the GNU Lesser General Public
|
|
+ License along with the GNU C Library; if not, see
|
|
+ <http://www.gnu.org/licenses/>. */
|
|
+
|
|
+#ifndef _FPU_CONTROL_H
|
|
+#define _FPU_CONTROL_H 1
|
|
+
|
|
+/* Note that this file sets on x86-64 only the x87 FPU, it does not
|
|
+ touch the SSE unit. */
|
|
+
|
|
+/* Here is the dirty part. Set up your 387 through the control word
|
|
+ * (cw) register.
|
|
+ *
|
|
+ * 15-13 12 11-10 9-8 7-6 5 4 3 2 1 0
|
|
+ * | reserved | IC | RC | PC | reserved | PM | UM | OM | ZM | DM | IM
|
|
+ *
|
|
+ * IM: Invalid operation mask
|
|
+ * DM: Denormalized operand mask
|
|
+ * ZM: Zero-divide mask
|
|
+ * OM: Overflow mask
|
|
+ * UM: Underflow mask
|
|
+ * PM: Precision (inexact result) mask
|
|
+ *
|
|
+ * Mask bit is 1 means no interrupt.
|
|
+ *
|
|
+ * PC: Precision control
|
|
+ * 11 - round to extended precision
|
|
+ * 10 - round to double precision
|
|
+ * 00 - round to single precision
|
|
+ *
|
|
+ * RC: Rounding control
|
|
+ * 00 - rounding to nearest
|
|
+ * 01 - rounding down (toward - infinity)
|
|
+ * 10 - rounding up (toward + infinity)
|
|
+ * 11 - rounding toward zero
|
|
+ *
|
|
+ * IC: Infinity control
|
|
+ * That is for 8087 and 80287 only.
|
|
+ *
|
|
+ * The hardware default is 0x037f which we use.
|
|
+ */
|
|
+
|
|
+#include <features.h>
|
|
+
|
|
+/* masking of interrupts */
|
|
+#define _FPU_MASK_IM 0x01
|
|
+#define _FPU_MASK_DM 0x02
|
|
+#define _FPU_MASK_ZM 0x04
|
|
+#define _FPU_MASK_OM 0x08
|
|
+#define _FPU_MASK_UM 0x10
|
|
+#define _FPU_MASK_PM 0x20
|
|
+
|
|
+/* precision control */
|
|
+#define _FPU_EXTENDED 0x300 /* libm requires double extended precision. */
|
|
+#define _FPU_DOUBLE 0x200
|
|
+#define _FPU_SINGLE 0x0
|
|
+
|
|
+/* rounding control */
|
|
+#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
|
|
+#define _FPU_RC_DOWN 0x400
|
|
+#define _FPU_RC_UP 0x800
|
|
+#define _FPU_RC_ZERO 0xC00
|
|
+
|
|
+#define _FPU_RESERVED 0xF0C0 /* Reserved bits in cw */
|
|
+
|
|
+
|
|
+/* The fdlibm code requires strict IEEE double precision arithmetic,
|
|
+ and no interrupts for exceptions, rounding to nearest. */
|
|
+
|
|
+#define _FPU_DEFAULT 0x037f
|
|
+
|
|
+/* IEEE: same as above. */
|
|
+#define _FPU_IEEE 0x037f
|
|
+
|
|
+/* Type of the control word. */
|
|
+typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
|
|
+
|
|
+/* Macros for accessing the hardware control word. "*&" is used to
|
|
+ work around a bug in older versions of GCC. __volatile__ is used
|
|
+ to support combination of writing the control register and reading
|
|
+ it back. Without __volatile__, the old value may be used for reading
|
|
+ back under compiler optimization.
|
|
+
|
|
+ Note that the use of these macros is not sufficient anymore with
|
|
+ recent hardware nor on x86-64. Some floating point operations are
|
|
+ executed in the SSE/SSE2 engines which have their own control and
|
|
+ status register. */
|
|
+#define _FPU_GETCW(cw) __asm__ __volatile__ ("fnstcw %0" : "=m" (*&cw))
|
|
+#define _FPU_SETCW(cw) __asm__ __volatile__ ("fldcw %0" : : "m" (*&cw))
|
|
+
|
|
+/* Default control word set at startup. */
|
|
+extern fpu_control_t __fpu_control;
|
|
+
|
|
+#endif /* fpu_control.h */
|
|
+
|
|
+#endif // AMD64
|
|
+// ==============================================================================
|
|
+// ==============================================================================
|
|
+// ==============================================================================
|
|
+
|
|
address os::current_stack_pointer() {
|
|
#ifdef SPARC_WORKS
|
|
register void *esp;
|