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/*
* LatticeMico32 helper routines.
*
* Copyright (c) 2010-2014 Michael Walle <michael@walle.cc>
*
* 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 "qemu/host-utils.h"
#include "sysemu/sysemu.h"
int lm32_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
int mmu_idx)
{
LM32CPU *cpu = LM32_CPU(cs);
CPULM32State *env = &cpu->env;
int prot;
address &= TARGET_PAGE_MASK;
prot = PAGE_BITS;
if (env->flags & LM32_FLAG_IGNORE_MSB) {
tlb_set_page(cs, address, address & 0x7fffffff, prot, mmu_idx,
TARGET_PAGE_SIZE);
} else {
tlb_set_page(cs, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
}
return 0;
}
hwaddr lm32_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
{
LM32CPU *cpu = LM32_CPU(cs);
addr &= TARGET_PAGE_MASK;
if (cpu->env.flags & LM32_FLAG_IGNORE_MSB) {
return addr & 0x7fffffff;
} else {
return addr;
}
}
void lm32_breakpoint_insert(CPULM32State *env, int idx, target_ulong address)
{
LM32CPU *cpu = lm32_env_get_cpu(env);
cpu_breakpoint_insert(CPU(cpu), address, BP_CPU,
&env->cpu_breakpoint[idx]);
}
void lm32_breakpoint_remove(CPULM32State *env, int idx)
{
LM32CPU *cpu = lm32_env_get_cpu(env);
if (!env->cpu_breakpoint[idx]) {
return;
}
cpu_breakpoint_remove_by_ref(CPU(cpu), env->cpu_breakpoint[idx]);
env->cpu_breakpoint[idx] = NULL;
}
void lm32_watchpoint_insert(CPULM32State *env, int idx, target_ulong address,
lm32_wp_t wp_type)
{
LM32CPU *cpu = lm32_env_get_cpu(env);
int flags = 0;
switch (wp_type) {
case LM32_WP_DISABLED:
/* nothing to to */
break;
case LM32_WP_READ:
flags = BP_CPU | BP_STOP_BEFORE_ACCESS | BP_MEM_READ;
break;
case LM32_WP_WRITE:
flags = BP_CPU | BP_STOP_BEFORE_ACCESS | BP_MEM_WRITE;
break;
case LM32_WP_READ_WRITE:
flags = BP_CPU | BP_STOP_BEFORE_ACCESS | BP_MEM_ACCESS;
break;
}
if (flags != 0) {
cpu_watchpoint_insert(CPU(cpu), address, 1, flags,
&env->cpu_watchpoint[idx]);
}
}
void lm32_watchpoint_remove(CPULM32State *env, int idx)
{
LM32CPU *cpu = lm32_env_get_cpu(env);
if (!env->cpu_watchpoint[idx]) {
return;
}
cpu_watchpoint_remove_by_ref(CPU(cpu), env->cpu_watchpoint[idx]);
env->cpu_watchpoint[idx] = NULL;
}
static bool check_watchpoints(CPULM32State *env)
{
LM32CPU *cpu = lm32_env_get_cpu(env);
int i;
for (i = 0; i < cpu->num_watchpoints; i++) {
if (env->cpu_watchpoint[i] &&
env->cpu_watchpoint[i]->flags & BP_WATCHPOINT_HIT) {
return true;
}
}
return false;
}
void lm32_debug_excp_handler(CPULM32State *env)
{
CPUState *cs = CPU(lm32_env_get_cpu(env));
CPUBreakpoint *bp;
if (cs->watchpoint_hit) {
if (cs->watchpoint_hit->flags & BP_CPU) {
cs->watchpoint_hit = NULL;
if (check_watchpoints(env)) {
raise_exception(env, EXCP_WATCHPOINT);
} else {
cpu_resume_from_signal(cs, NULL);
}
}
} else {
QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
if (bp->pc == env->pc) {
if (bp->flags & BP_CPU) {
raise_exception(env, EXCP_BREAKPOINT);
}
break;
}
}
}
}
void lm32_cpu_do_interrupt(CPUState *cs)
{
LM32CPU *cpu = LM32_CPU(cs);
CPULM32State *env = &cpu->env;
qemu_log_mask(CPU_LOG_INT,
"exception at pc=%x type=%x\n", env->pc, cs->exception_index);
switch (cs->exception_index) {
case EXCP_SYSTEMCALL:
if (unlikely(semihosting_enabled)) {
/* do_semicall() returns true if call was handled. Otherwise
* do the normal exception handling. */
if (lm32_cpu_do_semihosting(cs)) {
env->pc += 4;
break;
}
}
/* fall through */
case EXCP_INSN_BUS_ERROR:
case EXCP_DATA_BUS_ERROR:
case EXCP_DIVIDE_BY_ZERO:
case EXCP_IRQ:
/* non-debug exceptions */
env->regs[R_EA] = env->pc;
env->ie |= (env->ie & IE_IE) ? IE_EIE : 0;
env->ie &= ~IE_IE;
if (env->dc & DC_RE) {
env->pc = env->deba + (cs->exception_index * 32);
} else {
env->pc = env->eba + (cs->exception_index * 32);
}
log_cpu_state_mask(CPU_LOG_INT, cs, 0);
break;
case EXCP_BREAKPOINT:
case EXCP_WATCHPOINT:
/* debug exceptions */
env->regs[R_BA] = env->pc;
env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
env->ie &= ~IE_IE;
env->pc = env->deba + (cs->exception_index * 32);
log_cpu_state_mask(CPU_LOG_INT, cs, 0);
break;
default:
cpu_abort(cs, "unhandled exception type=%d\n",
cs->exception_index);
break;
}
}
LM32CPU *cpu_lm32_init(const char *cpu_model)
{
return LM32_CPU(cpu_generic_init(TYPE_LM32_CPU, cpu_model));
}
/* Some soc ignores the MSB on the address bus. Thus creating a shadow memory
* area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
* 0x80000000-0xffffffff is not cached and used to access IO devices. */
void cpu_lm32_set_phys_msb_ignore(CPULM32State *env, int value)
{
if (value) {
env->flags |= LM32_FLAG_IGNORE_MSB;
} else {
env->flags &= ~LM32_FLAG_IGNORE_MSB;
}
}
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