mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 17:50:20 +00:00
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>
|
|
|
|
#include <asm/fpu.h>
|
|
|
|
extern void __ieee_set_fp_control (unsigned long);
|
|
extern unsigned long __ieee_get_fp_control (void);
|
|
|
|
|
|
static inline unsigned long
|
|
rdfpcr (void)
|
|
{
|
|
unsigned long fpcr;
|
|
|
|
asm ("trapb; mf_fpcr $f0; trapb; stt $f0,%0" : "m="(fpcr));
|
|
return fpcr;
|
|
}
|
|
|
|
|
|
static inline void
|
|
wrfpcr (unsigned long fpcr)
|
|
{
|
|
asm volatile ("ldt $f0,%0; trapb; mt_fpcr $f0; trapb" :: "m"(fpcr));
|
|
}
|
|
|
|
|
|
void
|
|
__setfpucw (unsigned short fpu_control)
|
|
{
|
|
unsigned long fpcr = 0, fpcw = 0;
|
|
|
|
if (!fpu_control)
|
|
fpu_control = _FPU_DEFAULT;
|
|
|
|
/* first, set dynamic rounding mode: */
|
|
|
|
fpcr = rdfpcr();
|
|
fpcr &= ~FPCR_DYN_MASK;
|
|
switch (fpu_control & 0xc00) {
|
|
case _FPU_RC_NEAREST: fpcr |= FPCR_DYN_NORMAL; break;
|
|
case _FPU_RC_DOWN: fpcr |= FPCR_DYN_MINUS; break;
|
|
case _FPU_RC_UP: fpcr |= FPCR_DYN_PLUS; break;
|
|
case _FPU_RC_ZERO: fpcr |= FPCR_DYN_CHOPPED; break;
|
|
}
|
|
wrfpcr(fpcr);
|
|
|
|
/* now tell kernel about traps that we like to hear about: */
|
|
|
|
fpcw = __ieee_get_fp_control();
|
|
fpcw &= ~IEEE_TRAP_ENABLE_MASK;
|
|
|
|
if (!(fpu_control & _FPU_MASK_IM))
|
|
fpcw |= IEEE_TRAP_ENABLE_INV;
|
|
if (!(fpu_control & _FPU_MASK_DM))
|
|
fpcw |= IEEE_TRAP_ENABLE_UNF;
|
|
if (!(fpu_control & _FPU_MASK_ZM))
|
|
fpcw |= IEEE_TRAP_ENABLE_DZE;
|
|
if (!(fpu_control & _FPU_MASK_OM))
|
|
fpcw |= IEEE_TRAP_ENABLE_OVF;
|
|
if (!(fpu_control & _FPU_MASK_PM))
|
|
fpcw |= IEEE_TRAP_ENABLE_INE;
|
|
|
|
__ieee_set_fp_control(fpcw);
|
|
|
|
__fpu_control = fpu_control; /* update global copy */
|
|
}
|