90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
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* emulator main execution loop
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "exec/log.h"
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#include "system/tcg.h"
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#include "qemu/plugin.h"
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#include "internal-common.h"
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bool tcg_allowed;
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bool tcg_cflags_has(CPUState *cpu, uint32_t flags)
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{
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return cpu->tcg_cflags & flags;
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}
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void tcg_cflags_set(CPUState *cpu, uint32_t flags)
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{
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cpu->tcg_cflags |= flags;
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}
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uint32_t curr_cflags(CPUState *cpu)
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{
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uint32_t cflags = cpu->tcg_cflags;
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/*
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* Record gdb single-step. We should be exiting the TB by raising
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* EXCP_DEBUG, but to simplify other tests, disable chaining too.
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*
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* For singlestep and -d nochain, suppress goto_tb so that
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* we can log -d cpu,exec after every TB.
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*/
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if (unlikely(cpu->singlestep_enabled)) {
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cflags |= CF_NO_GOTO_TB | CF_NO_GOTO_PTR | CF_SINGLE_STEP | 1;
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} else if (qatomic_read(&one_insn_per_tb)) {
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cflags |= CF_NO_GOTO_TB | 1;
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} else if (qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
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cflags |= CF_NO_GOTO_TB;
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}
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return cflags;
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}
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/* exit the current TB, but without causing any exception to be raised */
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void cpu_loop_exit_noexc(CPUState *cpu)
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{
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cpu->exception_index = -1;
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cpu_loop_exit(cpu);
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}
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void cpu_loop_exit(CPUState *cpu)
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{
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/* Undo the setting in cpu_tb_exec. */
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cpu->neg.can_do_io = true;
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/* Undo any setting in generated code. */
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qemu_plugin_disable_mem_helpers(cpu);
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siglongjmp(cpu->jmp_env, 1);
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}
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void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
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{
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if (pc) {
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cpu_restore_state(cpu, pc);
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}
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cpu_loop_exit(cpu);
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}
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void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
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{
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/* Prevent looping if already executing in a serial context. */
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g_assert(!cpu_in_serial_context(cpu));
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cpu->exception_index = EXCP_ATOMIC;
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cpu_loop_exit_restore(cpu, pc);
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}
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