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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-common.h"
#include "qemu.h"
#include "user-internals.h"
#include "cpu_loop-common.h"
#include "signal-common.h"
void cpu_loop(CPUM68KState *env)
{
CPUState *cs = env_cpu(env);
int trapnr;
unsigned int n;
for(;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch(trapnr) {
case EXCP_HALT_INSN:
/* Semihosing syscall. */
env->pc += 4;
do_m68k_semihosting(env, env->dregs[0]);
break;
case EXCP_ILLEGAL:
case EXCP_LINEA:
case EXCP_LINEF:
force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
break;
case EXCP_CHK:
force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc);
break;
case EXCP_DIV0:
force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc);
break;
case EXCP_TRAP0:
{
abi_long ret;
n = env->dregs[0];
env->pc += 2;
ret = do_syscall(env,
n,
env->dregs[1],
env->dregs[2],
env->dregs[3],
env->dregs[4],
env->dregs[5],
env->aregs[0],
0, 0);
if (ret == -QEMU_ERESTARTSYS) {
env->pc -= 2;
} else if (ret != -QEMU_ESIGRETURN) {
env->dregs[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);
break;
default:
EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
abort();
}
process_pending_signals(env);
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
CPUState *cpu = env_cpu(env);
TaskState *ts = cpu->opaque;
struct image_info *info = ts->info;
env->pc = regs->pc;
env->dregs[0] = regs->d0;
env->dregs[1] = regs->d1;
env->dregs[2] = regs->d2;
env->dregs[3] = regs->d3;
env->dregs[4] = regs->d4;
env->dregs[5] = regs->d5;
env->dregs[6] = regs->d6;
env->dregs[7] = regs->d7;
env->aregs[0] = regs->a0;
env->aregs[1] = regs->a1;
env->aregs[2] = regs->a2;
env->aregs[3] = regs->a3;
env->aregs[4] = regs->a4;
env->aregs[5] = regs->a5;
env->aregs[6] = regs->a6;
env->aregs[7] = regs->usp;
env->sr = regs->sr;
ts->stack_base = info->start_stack;
ts->heap_base = info->brk;
/* This will be filled in on the first SYS_HEAPINFO call. */
ts->heap_limit = 0;
}
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