summaryrefslogtreecommitdiff
path: root/libc
diff options
context:
space:
mode:
Diffstat (limited to 'libc')
-rw-r--r--libc/sysdeps/linux/m68k/bits/fenv.h98
-rw-r--r--libc/sysdeps/linux/m68k/fpu_control.h77
2 files changed, 120 insertions, 55 deletions
diff --git a/libc/sysdeps/linux/m68k/bits/fenv.h b/libc/sysdeps/linux/m68k/bits/fenv.h
index b07f0ab51..37c5fe829 100644
--- a/libc/sysdeps/linux/m68k/bits/fenv.h
+++ b/libc/sysdeps/linux/m68k/bits/fenv.h
@@ -1,5 +1,4 @@
-/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
+/* Copyright (C) 1997-2025 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@@ -12,31 +11,38 @@
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/>. */
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
#ifndef _FENV_H
# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
#endif
+#if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
+
/* Define bits representing the exception. We use the bit positions of
the appropriate bits in the FPSR Accrued Exception Byte. */
enum
{
- FE_INEXACT = 1 << 3,
-#define FE_INEXACT FE_INEXACT
- FE_DIVBYZERO = 1 << 4,
-#define FE_DIVBYZERO FE_DIVBYZERO
- FE_UNDERFLOW = 1 << 5,
-#define FE_UNDERFLOW FE_UNDERFLOW
- FE_OVERFLOW = 1 << 6,
-#define FE_OVERFLOW FE_OVERFLOW
- FE_INVALID = 1 << 7
-#define FE_INVALID FE_INVALID
+ FE_INEXACT =
+# define FE_INEXACT (1 << 3)
+ FE_INEXACT,
+ FE_DIVBYZERO =
+# define FE_DIVBYZERO (1 << 4)
+ FE_DIVBYZERO,
+ FE_UNDERFLOW =
+# define FE_UNDERFLOW (1 << 5)
+ FE_UNDERFLOW,
+ FE_OVERFLOW =
+# define FE_OVERFLOW (1 << 6)
+ FE_OVERFLOW,
+ FE_INVALID =
+# define FE_INVALID (1 << 7)
+ FE_INVALID
};
-#define FE_ALL_EXCEPT \
+# define FE_ALL_EXCEPT \
(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
/* The m68k FPU supports all of the four defined rounding modes. We use
@@ -44,21 +50,45 @@ enum
appropriate macros. */
enum
{
- FE_TONEAREST = 0,
-#define FE_TONEAREST FE_TONEAREST
- FE_TOWARDZERO = 1 << 4,
-#define FE_TOWARDZERO FE_TOWARDZERO
- FE_DOWNWARD = 2 << 4,
-#define FE_DOWNWARD FE_DOWNWARD
- FE_UPWARD = 3 << 4
-#define FE_UPWARD FE_UPWARD
+ FE_TONEAREST =
+# define FE_TONEAREST 0
+ FE_TONEAREST,
+ FE_TOWARDZERO =
+# define FE_TOWARDZERO (1 << 4)
+ FE_TOWARDZERO,
+ FE_DOWNWARD =
+# define FE_DOWNWARD (2 << 4)
+ FE_DOWNWARD,
+ FE_UPWARD =
+# define FE_UPWARD (3 << 4)
+ FE_UPWARD
};
+#else
+
+/* In the soft-float case, only rounding to nearest is supported, with
+ no exceptions. */
+
+# define FE_ALL_EXCEPT 0
+
+enum
+ {
+ __FE_UNDEFINED = -1,
+
+ FE_TONEAREST =
+# define FE_TONEAREST 0
+ FE_TONEAREST
+ };
+
+#endif
+
/* Type representing exception flags. */
typedef unsigned int fexcept_t;
+#if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
+
/* Type representing floating-point environment. This structure
corresponds to the layout of the block written by `fmovem'. */
typedef struct
@@ -69,10 +99,30 @@ typedef struct
}
fenv_t;
+#else
+
+/* Keep ABI compatibility with the type used in the generic
+ bits/fenv.h, formerly used for no-FPU ColdFire. */
+typedef struct
+ {
+ fexcept_t __excepts;
+ }
+fenv_t;
+
+#endif
+
/* If the default argument is used we use this value. */
#define FE_DFL_ENV ((const fenv_t *) -1)
-#ifdef __USE_GNU
+#if defined __USE_GNU && (defined __HAVE_68881__ \
+ || defined __HAVE_FPU__ \
+ || defined __mcffpu__)
/* Floating-point environment where none of the exceptions are masked. */
# define FE_NOMASK_ENV ((const fenv_t *) -2)
#endif
+
+/* Type representing floating-point control modes. */
+typedef unsigned int femode_t;
+
+/* Default floating-point control modes. */
+# define FE_DFL_MODE ((const femode_t *) -1L)
diff --git a/libc/sysdeps/linux/m68k/fpu_control.h b/libc/sysdeps/linux/m68k/fpu_control.h
index 35ad95e6d..c3a9c6326 100644
--- a/libc/sysdeps/linux/m68k/fpu_control.h
+++ b/libc/sysdeps/linux/m68k/fpu_control.h
@@ -1,6 +1,5 @@
/* 68k FPU control word definitions.
- Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
+ Copyright (C) 1996-2025 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@@ -13,8 +12,8 @@
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/>. */
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
#ifndef _FPU_CONTROL_H
#define _FPU_CONTROL_H
@@ -29,9 +28,9 @@
* 12 -> enable trap for OVFL exception
* 11 -> enable trap for UNFL exception
* 10 -> enable trap for DZ exception
- * 9 -> enable trap for INEX2 exception
- * 8 -> enable trap for INEX1 exception
- * 7-6 -> Precision Control
+ * 9 -> enable trap for INEX2 exception (INEX on Coldfire)
+ * 8 -> enable trap for INEX1 exception (IDE on Coldfire)
+ * 7-6 -> Precision Control (only bit 6 is used on Coldfire)
* 5-4 -> Rounding Control
* 3-0 -> zero (read as 0, write as 0)
*
@@ -53,50 +52,66 @@
#include <features.h>
+#if defined (__mcoldfire__) && !defined (__mcffpu__)
+
+# define _FPU_RESERVED 0xffffffff
+# define _FPU_DEFAULT 0x00000000
+# define _FPU_GETCW(cw) ((cw) = 0)
+# define _FPU_SETCW(cw) ((void) (cw))
+
+#else
+
/* masking of interrupts */
-#define _FPU_MASK_BSUN 0x8000
-#define _FPU_MASK_SNAN 0x4000
-#define _FPU_MASK_OPERR 0x2000
-#define _FPU_MASK_OVFL 0x1000
-#define _FPU_MASK_UNFL 0x0800
-#define _FPU_MASK_DZ 0x0400
-#define _FPU_MASK_INEX1 0x0200
-#define _FPU_MASK_INEX2 0x0100
+# define _FPU_MASK_BSUN 0x8000
+# define _FPU_MASK_SNAN 0x4000
+# define _FPU_MASK_OPERR 0x2000
+# define _FPU_MASK_OVFL 0x1000
+# define _FPU_MASK_UNFL 0x0800
+# define _FPU_MASK_DZ 0x0400
+# define _FPU_MASK_INEX1 0x0200
+# define _FPU_MASK_INEX2 0x0100
/* precision control */
-#define _FPU_EXTENDED 0x00 /* RECOMMENDED */
-#define _FPU_DOUBLE 0x80
-#define _FPU_SINGLE 0x40 /* DO NOT USE */
+# ifdef __mcoldfire__
+# define _FPU_DOUBLE 0x00
+# else
+# define _FPU_EXTENDED 0x00 /* RECOMMENDED */
+# define _FPU_DOUBLE 0x80
+# endif
+# define _FPU_SINGLE 0x40 /* DO NOT USE */
/* rounding control */
-#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */
-#define _FPU_RC_ZERO 0x10
-#define _FPU_RC_DOWN 0x20
-#define _FPU_RC_UP 0x30
+# define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */
+# define _FPU_RC_ZERO 0x10
+# define _FPU_RC_DOWN 0x20
+# define _FPU_RC_UP 0x30
-#define _FPU_RESERVED 0xFFFF000F /* Reserved bits in fpucr */
+# ifdef __mcoldfire__
+# define _FPU_RESERVED 0xFFFF800F
+# else
+# define _FPU_RESERVED 0xFFFF000F /* Reserved bits in fpucr */
+# endif
/* Now two recommended fpucr */
/* The fdlibm code requires no interrupts for exceptions. Don't
change the rounding mode, it would break long double I/O! */
-#define _FPU_DEFAULT 0x00000000
+# define _FPU_DEFAULT 0x00000000
/* IEEE: same as above, but exceptions. We must make it non-zero so
that __setfpucw works. This bit will be ignored. */
-#define _FPU_IEEE 0x00000001
+# define _FPU_IEEE 0x00000001
+
+/* Macros for accessing the hardware control word. */
+# define _FPU_GETCW(cw) __asm__ ("fmove%.l %!, %0" : "=dm" (cw))
+# define _FPU_SETCW(cw) __asm__ volatile ("fmove%.l %0, %!" : : "dm" (cw))
+#endif
/* Type of the control word. */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
-/* Macros for accessing the hardware control word. */
-#define _FPU_GETCW(cw) __asm__ ("fmove%.l %!, %0" : "=dm" (cw))
-#define _FPU_SETCW(cw) __asm__ __volatile__ ("fmove%.l %0, %!" : : "dm" (cw))
-
-#if 0
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
-#endif
#endif /* _M68K_FPU_CONTROL_H */
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-29 09:33:08 +0000