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/*
* Helpers for HPPA instructions.
*
* Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
void QEMU_NORETURN HELPER(excp)(CPUHPPAState *env, int excp)
{
HPPACPU *cpu = hppa_env_get_cpu(env);
CPUState *cs = CPU(cpu);
cs->exception_index = excp;
cpu_loop_exit(cs);
}
static void QEMU_NORETURN dynexcp(CPUHPPAState *env, int excp, uintptr_t ra)
{
HPPACPU *cpu = hppa_env_get_cpu(env);
CPUState *cs = CPU(cpu);
cs->exception_index = excp;
cpu_loop_exit_restore(cs, ra);
}
void HELPER(tsv)(CPUHPPAState *env, target_ulong cond)
{
if (unlikely((target_long)cond < 0)) {
dynexcp(env, EXCP_SIGFPE, GETPC());
}
}
void HELPER(tcond)(CPUHPPAState *env, target_ulong cond)
{
if (unlikely(cond)) {
dynexcp(env, EXCP_SIGFPE, GETPC());
}
}
static void atomic_store_3(CPUHPPAState *env, target_ulong addr, uint32_t val,
uint32_t mask, uintptr_t ra)
{
uint32_t old, new, cmp;
#ifdef CONFIG_USER_ONLY
uint32_t *haddr = g2h(addr - 1);
old = *haddr;
while (1) {
new = (old & ~mask) | (val & mask);
cmp = atomic_cmpxchg(haddr, old, new);
if (cmp == old) {
return;
}
old = cmp;
}
#else
#error "Not implemented."
#endif
}
void HELPER(stby_b)(CPUHPPAState *env, target_ulong addr, target_ulong val)
{
uintptr_t ra = GETPC();
switch (addr & 3) {
case 3:
cpu_stb_data_ra(env, addr, val, ra);
break;
case 2:
cpu_stw_data_ra(env, addr, val, ra);
break;
case 1:
/* The 3 byte store must appear atomic. */
if (parallel_cpus) {
atomic_store_3(env, addr, val, 0x00ffffffu, ra);
} else {
cpu_stb_data_ra(env, addr, val >> 16, ra);
cpu_stw_data_ra(env, addr + 1, val, ra);
}
break;
default:
cpu_stl_data_ra(env, addr, val, ra);
break;
}
}
void HELPER(stby_e)(CPUHPPAState *env, target_ulong addr, target_ulong val)
{
uintptr_t ra = GETPC();
switch (addr & 3) {
case 3:
/* The 3 byte store must appear atomic. */
if (parallel_cpus) {
atomic_store_3(env, addr - 3, val, 0xffffff00u, ra);
} else {
cpu_stw_data_ra(env, addr - 3, val >> 16, ra);
cpu_stb_data_ra(env, addr - 1, val >> 8, ra);
}
break;
case 2:
cpu_stw_data_ra(env, addr - 2, val >> 16, ra);
break;
case 1:
cpu_stb_data_ra(env, addr - 1, val >> 24, ra);
break;
default:
/* Nothing is stored, but protection is checked and the
cacheline is marked dirty. */
#ifndef CONFIG_USER_ONLY
probe_write(env, addr, cpu_mmu_index(env, 0), ra);
#endif
break;
}
}
void HELPER(loaded_fr0)(CPUHPPAState *env)
{
uint32_t shadow = env->fr[0] >> 32;
int rm, d;
env->fr0_shadow = shadow;
switch (extract32(shadow, 9, 2)) {
default:
rm = float_round_nearest_even;
break;
case 1:
rm = float_round_to_zero;
break;
case 2:
rm = float_round_up;
break;
case 3:
rm = float_round_down;
break;
}
set_float_rounding_mode(rm, &env->fp_status);
d = extract32(shadow, 5, 1);
set_flush_to_zero(d, &env->fp_status);
set_flush_inputs_to_zero(d, &env->fp_status);
}
void cpu_hppa_loaded_fr0(CPUHPPAState *env)
{
helper_loaded_fr0(env);
}
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