290 lines
6.8 KiB
C
290 lines
6.8 KiB
C
/*
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* Alpha emulation cpu micro-operations helpers for qemu.
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*
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* Copyright (c) 2007 Jocelyn Mayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "dyngen-exec.h"
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#include "host-utils.h"
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#include "softfloat.h"
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#include "helper.h"
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#include "sysemu.h"
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#include "qemu-timer.h"
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/*****************************************************************************/
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/* Exceptions processing helpers */
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uint64_t helper_load_pcc (void)
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{
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#ifndef CONFIG_USER_ONLY
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/* In system mode we have access to a decent high-resolution clock.
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In order to make OS-level time accounting work with the RPCC,
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present it with a well-timed clock fixed at 250MHz. */
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return (((uint64_t)env->pcc_ofs << 32)
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| (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2));
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#else
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/* In user-mode, vm_clock doesn't exist. Just pass through the host cpu
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clock ticks. Also, don't bother taking PCC_OFS into account. */
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return (uint32_t)cpu_get_real_ticks();
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#endif
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}
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uint64_t helper_addqv (uint64_t op1, uint64_t op2)
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{
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uint64_t tmp = op1;
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op1 += op2;
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if (unlikely((tmp ^ op2 ^ (-1ULL)) & (tmp ^ op1) & (1ULL << 63))) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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return op1;
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}
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uint64_t helper_addlv (uint64_t op1, uint64_t op2)
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{
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uint64_t tmp = op1;
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op1 = (uint32_t)(op1 + op2);
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if (unlikely((tmp ^ op2 ^ (-1UL)) & (tmp ^ op1) & (1UL << 31))) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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return op1;
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}
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uint64_t helper_subqv (uint64_t op1, uint64_t op2)
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{
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uint64_t res;
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res = op1 - op2;
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if (unlikely((op1 ^ op2) & (res ^ op1) & (1ULL << 63))) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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return res;
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}
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uint64_t helper_sublv (uint64_t op1, uint64_t op2)
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{
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uint32_t res;
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res = op1 - op2;
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if (unlikely((op1 ^ op2) & (res ^ op1) & (1UL << 31))) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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return res;
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}
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uint64_t helper_mullv (uint64_t op1, uint64_t op2)
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{
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int64_t res = (int64_t)op1 * (int64_t)op2;
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if (unlikely((int32_t)res != res)) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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return (int64_t)((int32_t)res);
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}
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uint64_t helper_mulqv (uint64_t op1, uint64_t op2)
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{
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uint64_t tl, th;
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muls64(&tl, &th, op1, op2);
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/* If th != 0 && th != -1, then we had an overflow */
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if (unlikely((th + 1) > 1)) {
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arith_excp(env, GETPC(), EXC_M_IOV, 0);
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}
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return tl;
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}
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/* PALcode support special instructions */
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#if !defined (CONFIG_USER_ONLY)
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void helper_hw_ret (uint64_t a)
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{
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env->pc = a & ~3;
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env->intr_flag = 0;
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env->lock_addr = -1;
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if ((a & 1) == 0) {
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env->pal_mode = 0;
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swap_shadow_regs(env);
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}
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}
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void helper_tbia(void)
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{
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tlb_flush(env, 1);
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}
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void helper_tbis(uint64_t p)
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{
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tlb_flush_page(env, p);
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}
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void helper_halt(uint64_t restart)
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{
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if (restart) {
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qemu_system_reset_request();
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} else {
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qemu_system_shutdown_request();
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}
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}
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uint64_t helper_get_time(void)
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{
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return qemu_get_clock_ns(rtc_clock);
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}
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void helper_set_alarm(uint64_t expire)
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{
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if (expire) {
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env->alarm_expire = expire;
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qemu_mod_timer(env->alarm_timer, expire);
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} else {
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qemu_del_timer(env->alarm_timer);
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}
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}
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#endif
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/*****************************************************************************/
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/* Softmmu support */
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#if !defined (CONFIG_USER_ONLY)
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uint64_t helper_ldl_phys(uint64_t p)
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{
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return (int32_t)ldl_phys(p);
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}
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uint64_t helper_ldq_phys(uint64_t p)
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{
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return ldq_phys(p);
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}
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uint64_t helper_ldl_l_phys(uint64_t p)
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{
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env->lock_addr = p;
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return env->lock_value = (int32_t)ldl_phys(p);
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}
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uint64_t helper_ldq_l_phys(uint64_t p)
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{
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env->lock_addr = p;
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return env->lock_value = ldl_phys(p);
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}
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void helper_stl_phys(uint64_t p, uint64_t v)
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{
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stl_phys(p, v);
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}
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void helper_stq_phys(uint64_t p, uint64_t v)
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{
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stq_phys(p, v);
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}
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uint64_t helper_stl_c_phys(uint64_t p, uint64_t v)
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{
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uint64_t ret = 0;
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if (p == env->lock_addr) {
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int32_t old = ldl_phys(p);
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if (old == (int32_t)env->lock_value) {
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stl_phys(p, v);
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ret = 1;
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}
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}
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env->lock_addr = -1;
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return ret;
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}
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uint64_t helper_stq_c_phys(uint64_t p, uint64_t v)
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{
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uint64_t ret = 0;
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if (p == env->lock_addr) {
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uint64_t old = ldq_phys(p);
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if (old == env->lock_value) {
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stq_phys(p, v);
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ret = 1;
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}
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}
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env->lock_addr = -1;
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return ret;
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}
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static void QEMU_NORETURN do_unaligned_access(target_ulong addr, int is_write,
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int is_user, void *retaddr)
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{
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uint64_t pc;
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uint32_t insn;
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do_restore_state(env, retaddr);
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pc = env->pc;
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insn = ldl_code(pc);
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env->trap_arg0 = addr;
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env->trap_arg1 = insn >> 26; /* opcode */
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env->trap_arg2 = (insn >> 21) & 31; /* dest regno */
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env->exception_index = EXCP_UNALIGN;
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env->error_code = 0;
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cpu_loop_exit(env);
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}
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void QEMU_NORETURN cpu_unassigned_access(CPUAlphaState *env1,
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target_phys_addr_t addr, int is_write,
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int is_exec, int unused, int size)
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{
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env = env1;
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env->trap_arg0 = addr;
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env->trap_arg1 = is_write;
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dynamic_excp(env1, GETPC(), EXCP_MCHK, 0);
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}
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#include "softmmu_exec.h"
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#define MMUSUFFIX _mmu
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#define ALIGNED_ONLY
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#define SHIFT 0
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#include "softmmu_template.h"
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#define SHIFT 1
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#include "softmmu_template.h"
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#define SHIFT 2
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#include "softmmu_template.h"
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#define SHIFT 3
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#include "softmmu_template.h"
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/* try to fill the TLB and return an exception if error. If retaddr is
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NULL, it means that the function was called in C code (i.e. not
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from generated code or from helper.c) */
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/* XXX: fix it to restore all registers */
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void tlb_fill(CPUAlphaState *env1, target_ulong addr, int is_write, int mmu_idx,
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void *retaddr)
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{
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CPUAlphaState *saved_env;
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int ret;
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saved_env = env;
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env = env1;
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ret = cpu_alpha_handle_mmu_fault(env, addr, is_write, mmu_idx);
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if (unlikely(ret != 0)) {
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do_restore_state(env, retaddr);
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/* Exception index and error code are already set */
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cpu_loop_exit(env);
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}
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env = saved_env;
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}
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#endif
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