fff42f183e
Consistently access u16.high with atomics to avoid undefined behaviour in MTTCG. Note that icount_decr.u16.low is only used in icount mode, so regular accesses to it are OK. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <20181010144853.13005-2-cota@braap.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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* QEMU System Emulator, accelerator interfaces
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2014 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "sysemu/accel.h"
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#include "sysemu/sysemu.h"
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#include "qom/object.h"
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#include "qemu-common.h"
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#include "qom/cpu.h"
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#include "sysemu/cpus.h"
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#include "qemu/main-loop.h"
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unsigned long tcg_tb_size;
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#ifndef CONFIG_USER_ONLY
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/* mask must never be zero, except for A20 change call */
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static void tcg_handle_interrupt(CPUState *cpu, int mask)
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{
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int old_mask;
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g_assert(qemu_mutex_iothread_locked());
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old_mask = cpu->interrupt_request;
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cpu->interrupt_request |= mask;
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/*
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* If called from iothread context, wake the target cpu in
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* case its halted.
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*/
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if (!qemu_cpu_is_self(cpu)) {
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qemu_cpu_kick(cpu);
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} else {
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atomic_set(&cpu->icount_decr.u16.high, -1);
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if (use_icount &&
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!cpu->can_do_io
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&& (mask & ~old_mask) != 0) {
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cpu_abort(cpu, "Raised interrupt while not in I/O function");
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}
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}
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}
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#endif
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static int tcg_init(MachineState *ms)
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{
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tcg_exec_init(tcg_tb_size * 1024 * 1024);
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cpu_interrupt_handler = tcg_handle_interrupt;
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return 0;
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}
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static void tcg_accel_class_init(ObjectClass *oc, void *data)
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{
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AccelClass *ac = ACCEL_CLASS(oc);
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ac->name = "tcg";
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ac->init_machine = tcg_init;
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ac->allowed = &tcg_allowed;
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}
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#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
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static const TypeInfo tcg_accel_type = {
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.name = TYPE_TCG_ACCEL,
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.parent = TYPE_ACCEL,
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.class_init = tcg_accel_class_init,
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};
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static void register_accel_types(void)
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{
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type_register_static(&tcg_accel_type);
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}
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type_init(register_accel_types);
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