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Diffstat (limited to 'REORG.TODO/sysdeps/powerpc/fpu_control.h')
| -rw-r--r-- | REORG.TODO/sysdeps/powerpc/fpu_control.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/powerpc/fpu_control.h b/REORG.TODO/sysdeps/powerpc/fpu_control.h new file mode 100644 index 0000000000..842cbfa03f --- /dev/null +++ b/REORG.TODO/sysdeps/powerpc/fpu_control.h @@ -0,0 +1,120 @@ +/* FPU control word definitions. PowerPC version. + Copyright (C) 1996-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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 + +#ifdef _SOFT_FLOAT + +# define _FPU_RESERVED 0xffffffff +# define _FPU_DEFAULT 0x00000000 /* Default value. */ +typedef unsigned int fpu_control_t; +# define _FPU_GETCW(cw) (cw) = 0 +# define _FPU_SETCW(cw) (void) (cw) +extern fpu_control_t __fpu_control; + +#elif defined __NO_FPRS__ /* e500 */ + +/* rounding control */ +# define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ +# define _FPU_RC_DOWN 0x03 +# define _FPU_RC_UP 0x02 +# define _FPU_RC_ZERO 0x01 + +/* masking of interrupts */ +# define _FPU_MASK_ZM 0x10 /* zero divide */ +# define _FPU_MASK_OM 0x04 /* overflow */ +# define _FPU_MASK_UM 0x08 /* underflow */ +# define _FPU_MASK_XM 0x40 /* inexact */ +# define _FPU_MASK_IM 0x20 /* invalid operation */ + +# define _FPU_RESERVED 0x00c10080 /* These bits are reserved and not changed. */ + +/* Correct IEEE semantics require traps to be enabled at the hardware + level; the kernel then does the emulation and determines whether + generation of signals from those traps was enabled using prctl. */ +# define _FPU_DEFAULT 0x0000003c /* Default value. */ +# define _FPU_IEEE _FPU_DEFAULT + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Macros for accessing the hardware control word. */ +# define _FPU_GETCW(cw) \ + __asm__ volatile ("mfspefscr %0" : "=r" (cw)) +# define _FPU_SETCW(cw) \ + __asm__ volatile ("mtspefscr %0" : : "r" (cw)) + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#else /* PowerPC 6xx floating-point. */ + +/* rounding control */ +# define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ +# define _FPU_RC_DOWN 0x03 +# define _FPU_RC_UP 0x02 +# define _FPU_RC_ZERO 0x01 + +# define _FPU_MASK_NI 0x04 /* non-ieee mode */ + +/* masking of interrupts */ +# define _FPU_MASK_ZM 0x10 /* zero divide */ +# define _FPU_MASK_OM 0x40 /* overflow */ +# define _FPU_MASK_UM 0x20 /* underflow */ +# define _FPU_MASK_XM 0x08 /* inexact */ +# define _FPU_MASK_IM 0x80 /* invalid operation */ + +# define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */ + +/* The fdlibm code requires no interrupts for exceptions. */ +# define _FPU_DEFAULT 0x00000000 /* Default value. */ + +/* IEEE: same as above, but (some) exceptions; + we leave the 'inexact' exception off. + */ +# define _FPU_IEEE 0x000000f0 + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Macros for accessing the hardware control word. */ +# define _FPU_GETCW(cw) \ + ({union { double __d; unsigned long long __ll; } __u; \ + register double __fr; \ + __asm__ ("mffs %0" : "=f" (__fr)); \ + __u.__d = __fr; \ + (cw) = (fpu_control_t) __u.__ll; \ + (fpu_control_t) __u.__ll; \ + }) + +# define _FPU_SETCW(cw) \ + { union { double __d; unsigned long long __ll; } __u; \ + register double __fr; \ + __u.__ll = 0xfff80000LL << 32; /* This is a QNaN. */ \ + __u.__ll |= (cw) & 0xffffffffLL; \ + __fr = __u.__d; \ + __asm__ ("mtfsf 255,%0" : : "f" (__fr)); \ + } + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* PowerPC 6xx floating-point. */ + +#endif /* _FPU_CONTROL_H */ |