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/*
* Moxie helper routines.
*
* Copyright (c) 2008, 2009, 2010, 2013 Anthony Green
*
* 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 General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "mmu.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.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) */
void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
uintptr_t retaddr)
{
int ret;
ret = moxie_cpu_handle_mmu_fault(cs, addr, is_write, mmu_idx);
if (unlikely(ret)) {
if (retaddr) {
cpu_restore_state(cs, retaddr);
}
}
cpu_loop_exit(cs);
}
void helper_raise_exception(CPUMoxieState *env, int ex)
{
CPUState *cs = CPU(moxie_env_get_cpu(env));
cs->exception_index = ex;
/* Stash the exception type. */
env->sregs[2] = ex;
/* Stash the address where the exception occurred. */
cpu_restore_state(cs, GETPC());
env->sregs[5] = env->pc;
/* Jump to the exception handline routine. */
env->pc = env->sregs[1];
cpu_loop_exit(cs);
}
uint32_t helper_div(CPUMoxieState *env, uint32_t a, uint32_t b)
{
if (unlikely(b == 0)) {
helper_raise_exception(env, MOXIE_EX_DIV0);
return 0;
}
if (unlikely(a == INT_MIN && b == -1)) {
return INT_MIN;
}
return (int32_t)a / (int32_t)b;
}
uint32_t helper_udiv(CPUMoxieState *env, uint32_t a, uint32_t b)
{
if (unlikely(b == 0)) {
helper_raise_exception(env, MOXIE_EX_DIV0);
return 0;
}
return a / b;
}
void helper_debug(CPUMoxieState *env)
{
CPUState *cs = CPU(moxie_env_get_cpu(env));
cs->exception_index = EXCP_DEBUG;
cpu_loop_exit(cs);
}
#if defined(CONFIG_USER_ONLY)
void moxie_cpu_do_interrupt(CPUState *cs)
{
CPUState *cs = CPU(moxie_env_get_cpu(env));
cs->exception_index = -1;
}
int moxie_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
int rw, int mmu_idx)
{
MoxieCPU *cpu = MOXIE_CPU(cs);
cs->exception_index = 0xaa;
cpu->env.debug1 = address;
cpu_dump_state(cs, stderr, fprintf, 0);
return 1;
}
#else /* !CONFIG_USER_ONLY */
int moxie_cpu_handle_mmu_fault(CPUState *cs, vaddr address,
int rw, int mmu_idx)
{
MoxieCPU *cpu = MOXIE_CPU(cs);
CPUMoxieState *env = &cpu->env;
MoxieMMUResult res;
int prot, miss;
target_ulong phy;
int r = 1;
address &= TARGET_PAGE_MASK;
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
miss = moxie_mmu_translate(&res, env, address, rw, mmu_idx);
if (miss) {
/* handle the miss. */
phy = 0;
cs->exception_index = MOXIE_EX_MMU_MISS;
} else {
phy = res.phy;
r = 0;
}
tlb_set_page(cs, address, phy, prot, mmu_idx, TARGET_PAGE_SIZE);
return r;
}
void moxie_cpu_do_interrupt(CPUState *cs)
{
switch (cs->exception_index) {
case MOXIE_EX_BREAK:
break;
default:
break;
}
}
hwaddr moxie_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
{
MoxieCPU *cpu = MOXIE_CPU(cs);
uint32_t phy = addr;
MoxieMMUResult res;
int miss;
miss = moxie_mmu_translate(&res, &cpu->env, addr, 0, 0);
if (!miss) {
phy = res.phy;
}
return phy;
}
#endif
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