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/*
* qemu user cpu loop
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 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 "qemu.h"
#include "user-internals.h"
#include "user/cpu_loop.h"
#include "signal-common.h"
void cpu_loop(CPUSH4State *env)
{
CPUState *cs = env_cpu(env);
int trapnr, ret;
while (1) {
bool arch_interrupt = true;
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
qemu_process_cpu_events(cs);
switch (trapnr) {
case 0x160:
env->pc += 2;
ret = do_syscall(env,
env->gregs[3],
env->gregs[4],
env->gregs[5],
env->gregs[6],
env->gregs[7],
env->gregs[0],
env->gregs[1],
0, 0);
if (ret == -QEMU_ERESTARTSYS) {
env->pc -= 2;
} else if (ret != -QEMU_ESIGRETURN) {
env->gregs[0] = ret;
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_DEBUG:
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
arch_interrupt = false;
break;
default:
fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
cpu_dump_state(cs, stderr, 0);
exit(EXIT_FAILURE);
}
process_pending_signals (env);
/* Most of the traps imply an exception or interrupt, which
implies an REI instruction has been executed. Which means
that LDST (aka LOK_ADDR) should be cleared. But there are
a few exceptions for traps internal to QEMU. */
if (arch_interrupt) {
env->lock_addr = -1;
}
}
}
void init_main_thread(CPUState *cs, struct image_info *info)
{
CPUArchState *env = cpu_env(cs);
env->pc = info->entry;
env->gregs[15] = info->start_stack;
}
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