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/*
* emulator main execution loop
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* 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 2.1 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 "qemu/osdep.h"
#include "exec/log.h"
#include "system/tcg.h"
#include "qemu/plugin.h"
#include "internal-common.h"
bool tcg_allowed;
bool tcg_cflags_has(CPUState *cpu, uint32_t flags)
{
return cpu->tcg_cflags & flags;
}
void tcg_cflags_set(CPUState *cpu, uint32_t flags)
{
cpu->tcg_cflags |= flags;
}
uint32_t curr_cflags(CPUState *cpu)
{
uint32_t cflags = cpu->tcg_cflags;
/*
* Record gdb single-step. We should be exiting the TB by raising
* EXCP_DEBUG, but to simplify other tests, disable chaining too.
*
* For singlestep and -d nochain, suppress goto_tb so that
* we can log -d cpu,exec after every TB.
*/
if (unlikely(cpu->singlestep_enabled)) {
cflags |= CF_NO_GOTO_TB | CF_NO_GOTO_PTR | CF_SINGLE_STEP | 1;
} else if (qatomic_read(&one_insn_per_tb)) {
cflags |= CF_NO_GOTO_TB | 1;
} else if (qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
cflags |= CF_NO_GOTO_TB;
}
return cflags;
}
/* exit the current TB, but without causing any exception to be raised */
void cpu_loop_exit_noexc(CPUState *cpu)
{
cpu->exception_index = -1;
cpu_loop_exit(cpu);
}
void cpu_loop_exit(CPUState *cpu)
{
/* Undo the setting in cpu_tb_exec. */
cpu->neg.can_do_io = true;
/* Undo any setting in generated code. */
qemu_plugin_disable_mem_helpers(cpu);
siglongjmp(cpu->jmp_env, 1);
}
void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
{
if (pc) {
cpu_restore_state(cpu, pc);
}
cpu_loop_exit(cpu);
}
void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
{
/* Prevent looping if already executing in a serial context. */
g_assert(!cpu_in_serial_context(cpu));
cpu->exception_index = EXCP_ATOMIC;
cpu_loop_exit_restore(cpu, pc);
}
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