diff options
Diffstat (limited to 'ports/sysdeps/hppa/fpu/fpu_control.h')
| -rw-r--r-- | ports/sysdeps/hppa/fpu/fpu_control.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/ports/sysdeps/hppa/fpu/fpu_control.h b/ports/sysdeps/hppa/fpu/fpu_control.h new file mode 100644 index 0000000000..60697975ee --- /dev/null +++ b/ports/sysdeps/hppa/fpu/fpu_control.h @@ -0,0 +1,66 @@ +/* FPU control word definitions. HP-PARISC version. + Copyright (C) 2012 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 + +/* Masking of interrupts */ +#define _FPU_MASK_PM 0x00000001 /* Inexact (I) */ +#define _FPU_MASK_UM 0x00000002 /* Underflow (U) */ +#define _FPU_MASK_OM 0x00000004 /* Overflow (O) */ +#define _FPU_MASK_ZM 0x00000008 /* Divide by zero (Z) */ +#define _FPU_MASK_IM 0x00000010 /* Invalid operation (V) */ + +/* Masking of rounding modes. */ +#define _FPU_HPPA_MASK_RM 0x00000600 /* Rounding mode mask */ +/* Masking of interrupt enable bits. */ +#define _FPU_HPPA_MASK_INT 0x0000001f /* Interrupt mask */ + +/* There are no reserved bits in the PA fpsr (though some are undefined). */ +#define _FPU_RESERVED 0x00000000 +/* Default is: No traps enabled, no flags set, round to nearest. */ +#define _FPU_DEFAULT 0x00000000 +/* Default + exceptions (FE_ALL_EXCEPT) enabled. */ +#define _FPU_IEEE (_FPU_DEFAULT | _FPU_HPPA_MASK_INT) + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(cw) \ +({ \ + union { unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \ + /* Get the current status word. */ \ + __asm__ ("fstd %%fr0,0(%1)\n\t" \ + "fldd 0(%1),%%fr0\n\t" \ + : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0"); \ + __fullfp.__halfreg[0]; \ +}) + +#define _FPU_SETCW(cw) \ +({ \ + union { unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \ + __fullfp.__halfreg[0] = cw; \ + __asm__ ("fldd 0(%1),%%fr0\n\t" \ + : : "m" (__fullfp.__fpreg), "r" (__fullfp.__fpreg) : "%r0" ); \ +}) + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _FPU_CONTROL_H */ |