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6932e44461
* sysdeps/unix/sysv/linux/alpha/Makefile, sysdeps/unix/sysv/linux/alpha/brk.S, sysdeps/unix/sysv/linux/alpha/fpu_control.c, sysdeps/unix/sysv/linux/alpha/fpu_control.h, sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S, sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S, sysdeps/unix/sysv/linux/alpha/pipe.S, sysdeps/unix/sysv/linux/alpha/setfpucw.c, sysdeps/unix/sysv/linux/alpha/sigprocmask.c, sysdeps/unix/sysv/linux/alpha/speed.c, sysdeps/unix/sysv/linux/alpha/start.S, sysdeps/unix/sysv/linux/alpha/syscall.S, sysdeps/unix/sysv/linux/alpha/syscalls.list, sysdeps/unix/sysv/linux/alpha/sysdep.S, sysdeps/unix/sysv/linux/alpha/sysdep.h: New files.
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#include <fpu_control.h>
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#include <asm/fpu.h>
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extern void __ieee_set_fp_control (unsigned long);
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extern unsigned long __ieee_get_fp_control (void);
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static inline unsigned long
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rdfpcr (void)
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{
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unsigned long fpcr;
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asm ("trapb; mf_fpcr $f0; trapb; stt $f0,%0" : "m="(fpcr));
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return fpcr;
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}
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static inline void
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wrfpcr (unsigned long fpcr)
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{
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asm volatile ("ldt $f0,%0; trapb; mt_fpcr $f0; trapb" :: "m"(fpcr));
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}
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void
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__setfpucw (unsigned short fpu_control)
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{
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unsigned long fpcr = 0, fpcw = 0;
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if (!fpu_control)
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fpu_control = _FPU_DEFAULT;
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/* first, set dynamic rounding mode: */
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fpcr = rdfpcr();
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fpcr &= ~FPCR_DYN_MASK;
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switch (fpu_control & 0xc00) {
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case _FPU_RC_NEAREST: fpcr |= FPCR_DYN_NORMAL; break;
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case _FPU_RC_DOWN: fpcr |= FPCR_DYN_MINUS; break;
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case _FPU_RC_UP: fpcr |= FPCR_DYN_PLUS; break;
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case _FPU_RC_ZERO: fpcr |= FPCR_DYN_CHOPPED; break;
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}
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wrfpcr(fpcr);
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/* now tell kernel about traps that we like to hear about: */
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fpcw = __ieee_get_fp_control();
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fpcw &= ~IEEE_TRAP_ENABLE_MASK;
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if (!(fpu_control & _FPU_MASK_IM))
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fpcw |= IEEE_TRAP_ENABLE_INV;
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if (!(fpu_control & _FPU_MASK_DM))
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fpcw |= IEEE_TRAP_ENABLE_UNF;
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if (!(fpu_control & _FPU_MASK_ZM))
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fpcw |= IEEE_TRAP_ENABLE_DZE;
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if (!(fpu_control & _FPU_MASK_OM))
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fpcw |= IEEE_TRAP_ENABLE_OVF;
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if (!(fpu_control & _FPU_MASK_PM))
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fpcw |= IEEE_TRAP_ENABLE_INE;
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__ieee_set_fp_control(fpcw);
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__fpu_control = fpu_control; /* update global copy */
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}
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