op_helper.c
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/*
* ARM helper routines
*
* Copyright (c) 2005 CodeSourcery, LLC
*
* This 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 of the License, or (at your option) any later version.
*
* This 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <math.h>
#include <fenv.h>
#include "exec.h"
/* If the host doesn't define C99 math intrinsics then use the normal
operators. This may generate excess exceptions, but it's probably
near enough for most things. */
#ifndef isless
#define isless(x, y) (x < y)
#endif
#ifndef isgreater
#define isgreater(x, y) (x > y)
#endif
#ifndef isunordered
#define isunordered(x, y) (!((x < y) || (x >= y)))
#endif
void raise_exception(int tt)
{
env->exception_index = tt;
cpu_loop_exit();
}
/* thread support */
spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
void cpu_lock(void)
{
spin_lock(&global_cpu_lock);
}
void cpu_unlock(void)
{
spin_unlock(&global_cpu_lock);
}
/* VFP support. */
void do_vfp_abss(void)
{
FT0s = fabsf(FT0s);
}
void do_vfp_absd(void)
{
FT0d = fabs(FT0d);
}
void do_vfp_sqrts(void)
{
FT0s = sqrtf(FT0s);
}
void do_vfp_sqrtd(void)
{
FT0d = sqrt(FT0d);
}
/* We use an == operator first to generate teh correct floating point
exception. Subsequent comparisons use the exception-safe macros. */
#define DO_VFP_cmp(p) \
void do_vfp_cmp##p(void) \
{ \
uint32_t flags; \
if (FT0##p == FT1##p) \
flags = 0xc; \
else if (isless (FT0##p, FT1##p)) \
flags = 0x8; \
else if (isgreater (FT0##p, FT1##p)) \
flags = 0x2; \
else /* unordered */ \
flags = 0x3; \
env->vfp.fpscr = (flags << 28) | (env->vfp.fpscr & 0x0fffffff); \
FORCE_RET(); \
}
DO_VFP_cmp(s)
DO_VFP_cmp(d)
#undef DO_VFP_cmp
/* We use a > operator first to get FP exceptions right. */
#define DO_VFP_cmpe(p) \
void do_vfp_cmpe##p(void) \
{ \
uint32_t flags; \
if (FT0##p > FT1##p) \
flags = 0x2; \
else if (isless (FT0##p, FT1##p)) \
flags = 0x8; \
else if (isunordered (FT0##p, FT1##p)) \
flags = 0x3; \
else /* equal */ \
flags = 0xc; \
env->vfp.fpscr = (flags << 28) | (env->vfp.fpscr & 0x0fffffff); \
FORCE_RET(); \
}
DO_VFP_cmpe(s)
DO_VFP_cmpe(d)
#undef DO_VFP_cmpe
/* Convert host exception flags to vfp form. */
int vfp_exceptbits_from_host(int host_bits)
{
int target_bits = 0;
#ifdef FE_INVALID
if (host_bits & FE_INVALID)
target_bits |= 1;
#endif
#ifdef FE_DIVBYZERO
if (host_bits & FE_DIVBYZERO)
target_bits |= 2;
#endif
#ifdef FE_OVERFLOW
if (host_bits & FE_OVERFLOW)
target_bits |= 4;
#endif
#ifdef FE_UNDERFLOW
if (host_bits & FE_UNDERFLOW)
target_bits |= 8;
#endif
#ifdef FE_INEXACT
if (host_bits & FE_INEXACT)
target_bits |= 0x10;
#endif
/* C doesn't define an inexact exception. */
return target_bits;
}
/* Convert vfp exception flags to target form. */
int vfp_host_exceptbits_to_host(int target_bits)
{
int host_bits = 0;
#ifdef FE_INVALID
if (target_bits & 1)
host_bits |= FE_INVALID;
#endif
#ifdef FE_DIVBYZERO
if (target_bits & 2)
host_bits |= FE_DIVBYZERO;
#endif
#ifdef FE_OVERFLOW
if (target_bits & 4)
host_bits |= FE_OVERFLOW;
#endif
#ifdef FE_UNDERFLOW
if (target_bits & 8)
host_bits |= FE_UNDERFLOW;
#endif
#ifdef FE_INEXACT
if (target_bits & 0x10)
host_bits |= FE_INEXACT;
#endif
return host_bits;
}
void do_vfp_set_fpscr(void)
{
int i;
uint32_t changed;
changed = env->vfp.fpscr;
env->vfp.fpscr = (T0 & 0xffc8ffff);
env->vfp.vec_len = (T0 >> 16) & 7;
env->vfp.vec_stride = (T0 >> 20) & 3;
changed ^= T0;
if (changed & (3 << 22)) {
i = (T0 >> 22) & 3;
switch (i) {
case 0:
i = FE_TONEAREST;
break;
case 1:
i = FE_UPWARD;
break;
case 2:
i = FE_DOWNWARD;
break;
case 3:
i = FE_TOWARDZERO;
break;
}
fesetround (i);
}
/* Clear host exception flags. */
feclearexcept(FE_ALL_EXCEPT);
#ifdef feenableexcept
if (changed & 0x1f00) {
i = vfp_exceptbits_to_host((T0 >> 8) & 0x1f);
feenableexcept (i);
fedisableexcept (FE_ALL_EXCEPT & ~i);
}
#endif
/* XXX: FZ and DN are not implemented. */
}
void do_vfp_get_fpscr(void)
{
int i;
T0 = (env->vfp.fpscr & 0xffc8ffff) | (env->vfp.vec_len << 16)
| (env->vfp.vec_stride << 20);
i = fetestexcept(FE_ALL_EXCEPT);
T0 |= vfp_exceptbits_from_host(i);
}