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 "exec.h"
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 = float32_abs(FT0s);
}
void do_vfp_absd(void)
{
FT0d = float64_abs(FT0d);
}
void do_vfp_sqrts(void)
{
FT0s = float32_sqrt(FT0s, &env->vfp.fp_status);
}
void do_vfp_sqrtd(void)
{
FT0d = float64_sqrt(FT0d, &env->vfp.fp_status);
}
/* XXX: check quiet/signaling case */
#define DO_VFP_cmp(p, size) \
void do_vfp_cmp##p(void) \
{ \
uint32_t flags; \
switch(float ## size ## _compare_quiet(FT0##p, FT1##p, &env->vfp.fp_status)) {\
case 0: flags = 0xc; break;\
case -1: flags = 0x8; break;\
case 1: flags = 0x2; break;\
default: case 2: flags = 0x3; break;\
}\
env->vfp.fpscr = (flags << 28) | (env->vfp.fpscr & 0x0fffffff); \
FORCE_RET(); \
}\
\
void do_vfp_cmpe##p(void) \
{ \
uint32_t flags; \
switch(float ## size ## _compare(FT0##p, FT1##p, &env->vfp.fp_status)) {\
case 0: flags = 0xc; break;\
case -1: flags = 0x8; break;\
case 1: flags = 0x2; break;\
default: case 2: flags = 0x3; break;\
}\
env->vfp.fpscr = (flags << 28) | (env->vfp.fpscr & 0x0fffffff); \
FORCE_RET(); \
}
DO_VFP_cmp(s, 32)
DO_VFP_cmp(d, 64)
#undef DO_VFP_cmp
/* Convert host exception flags to vfp form. */
static inline int vfp_exceptbits_from_host(int host_bits)
{
int target_bits = 0;
if (host_bits & float_flag_invalid)
target_bits |= 1;
if (host_bits & float_flag_divbyzero)
target_bits |= 2;
if (host_bits & float_flag_overflow)
target_bits |= 4;
if (host_bits & float_flag_underflow)
target_bits |= 8;
if (host_bits & float_flag_inexact)
target_bits |= 0x10;
return target_bits;
}
/* Convert vfp exception flags to target form. */
static inline int vfp_exceptbits_to_host(int target_bits)
{
int host_bits = 0;
if (target_bits & 1)
host_bits |= float_flag_invalid;
if (target_bits & 2)
host_bits |= float_flag_divbyzero;
if (target_bits & 4)
host_bits |= float_flag_overflow;
if (target_bits & 8)
host_bits |= float_flag_underflow;
if (target_bits & 0x10)
host_bits |= float_flag_inexact;
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 = float_round_nearest_even;
break;
case 1:
i = float_round_up;
break;
case 2:
i = float_round_down;
break;
case 3:
i = float_round_to_zero;
break;
}
set_float_rounding_mode(i, &env->vfp.fp_status);
}
i = vfp_exceptbits_to_host((T0 >> 8) & 0x1f);
set_float_exception_flags(i, &env->vfp.fp_status);
/* 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 = get_float_exception_flags(&env->vfp.fp_status);
T0 |= vfp_exceptbits_from_host(i);
}