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/*
* Alpha emulation cpu micro-operations helpers for qemu.
*
* Copyright (c) 2007 Jocelyn Mayer
*
* 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 "cpu.h"
#include "dyngen-exec.h"
#include "host-utils.h"
#include "softfloat.h"
#include "helper.h"
#include "sysemu.h"
#include "qemu-timer.h"
/*****************************************************************************/
/* Exceptions processing helpers */
uint64_t helper_load_pcc (void)
{
#ifndef CONFIG_USER_ONLY
/* In system mode we have access to a decent high-resolution clock.
In order to make OS-level time accounting work with the RPCC,
present it with a well-timed clock fixed at 250MHz. */
return (((uint64_t)env->pcc_ofs << 32)
| (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2));
#else
/* In user-mode, vm_clock doesn't exist. Just pass through the host cpu
clock ticks. Also, don't bother taking PCC_OFS into account. */
return (uint32_t)cpu_get_real_ticks();
#endif
}
/* PALcode support special instructions */
#if !defined (CONFIG_USER_ONLY)
void helper_hw_ret (uint64_t a)
{
env->pc = a & ~3;
env->intr_flag = 0;
env->lock_addr = -1;
if ((a & 1) == 0) {
env->pal_mode = 0;
swap_shadow_regs(env);
}
}
void helper_tbia(void)
{
tlb_flush(env, 1);
}
void helper_tbis(uint64_t p)
{
tlb_flush_page(env, p);
}
void helper_halt(uint64_t restart)
{
if (restart) {
qemu_system_reset_request();
} else {
qemu_system_shutdown_request();
}
}
uint64_t helper_get_time(void)
{
return qemu_get_clock_ns(rtc_clock);
}
void helper_set_alarm(uint64_t expire)
{
if (expire) {
env->alarm_expire = expire;
qemu_mod_timer(env->alarm_timer, expire);
} else {
qemu_del_timer(env->alarm_timer);
}
}
#endif
/*****************************************************************************/
/* Softmmu support */
#if !defined (CONFIG_USER_ONLY)
uint64_t helper_ldl_phys(uint64_t p)
{
return (int32_t)ldl_phys(p);
}
uint64_t helper_ldq_phys(uint64_t p)
{
return ldq_phys(p);
}
uint64_t helper_ldl_l_phys(uint64_t p)
{
env->lock_addr = p;
return env->lock_value = (int32_t)ldl_phys(p);
}
uint64_t helper_ldq_l_phys(uint64_t p)
{
env->lock_addr = p;
return env->lock_value = ldl_phys(p);
}
void helper_stl_phys(uint64_t p, uint64_t v)
{
stl_phys(p, v);
}
void helper_stq_phys(uint64_t p, uint64_t v)
{
stq_phys(p, v);
}
uint64_t helper_stl_c_phys(uint64_t p, uint64_t v)
{
uint64_t ret = 0;
if (p == env->lock_addr) {
int32_t old = ldl_phys(p);
if (old == (int32_t)env->lock_value) {
stl_phys(p, v);
ret = 1;
}
}
env->lock_addr = -1;
return ret;
}
uint64_t helper_stq_c_phys(uint64_t p, uint64_t v)
{
uint64_t ret = 0;
if (p == env->lock_addr) {
uint64_t old = ldq_phys(p);
if (old == env->lock_value) {
stq_phys(p, v);
ret = 1;
}
}
env->lock_addr = -1;
return ret;
}
static void QEMU_NORETURN do_unaligned_access(target_ulong addr, int is_write,
int is_user, void *retaddr)
{
uint64_t pc;
uint32_t insn;
do_restore_state(env, retaddr);
pc = env->pc;
insn = ldl_code(pc);
env->trap_arg0 = addr;
env->trap_arg1 = insn >> 26; /* opcode */
env->trap_arg2 = (insn >> 21) & 31; /* dest regno */
env->exception_index = EXCP_UNALIGN;
env->error_code = 0;
cpu_loop_exit(env);
}
void QEMU_NORETURN cpu_unassigned_access(CPUAlphaState *env1,
target_phys_addr_t addr, int is_write,
int is_exec, int unused, int size)
{
env = env1;
env->trap_arg0 = addr;
env->trap_arg1 = is_write;
dynamic_excp(env1, GETPC(), EXCP_MCHK, 0);
}
#include "softmmu_exec.h"
#define MMUSUFFIX _mmu
#define ALIGNED_ONLY
#define SHIFT 0
#include "softmmu_template.h"
#define SHIFT 1
#include "softmmu_template.h"
#define SHIFT 2
#include "softmmu_template.h"
#define SHIFT 3
#include "softmmu_template.h"
/* try to fill the TLB and return an exception if error. If retaddr is
NULL, it means that the function was called in C code (i.e. not
from generated code or from helper.c) */
/* XXX: fix it to restore all registers */
void tlb_fill(CPUAlphaState *env1, target_ulong addr, int is_write, int mmu_idx,
void *retaddr)
{
CPUAlphaState *saved_env;
int ret;
saved_env = env;
env = env1;
ret = cpu_alpha_handle_mmu_fault(env, addr, is_write, mmu_idx);
if (unlikely(ret != 0)) {
do_restore_state(env, retaddr);
/* Exception index and error code are already set */
cpu_loop_exit(env);
}
env = saved_env;
}
#endif
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