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tcg: access cpu->icount_decr.u16.high with atomics 

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>
This commit is contained in:
Emilio G. Cota 2018-10-10 10:48:50 -04:00 committed by Richard Henderson
parent d7f425fdea
commit fff42f183e
3 changed files with 3 additions and 3 deletions
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2
accel/tcg/tcg-all.c
View File

@ -51,7 +51,7 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask)
if (!qemu_cpu_is_self(cpu)) {
qemu_cpu_kick(cpu);
} else {
cpu->icount_decr.u16.high = -1;
atomic_set(&cpu->icount_decr.u16.high, -1);
if (use_icount &&
!cpu->can_do_io
&& (mask & ~old_mask) != 0) {

2
accel/tcg/translate-all.c
View File

@ -2341,7 +2341,7 @@ void cpu_interrupt(CPUState *cpu, int mask)
{
g_assert(qemu_mutex_iothread_locked());
cpu->interrupt_request |= mask;
cpu->icount_decr.u16.high = -1;
atomic_set(&cpu->icount_decr.u16.high, -1);
}
/*

2
qom/cpu.c
View File

@ -265,7 +265,7 @@ static void cpu_common_reset(CPUState *cpu)
cpu->mem_io_pc = 0;
cpu->mem_io_vaddr = 0;
cpu->icount_extra = 0;
cpu->icount_decr.u32 = 0;
atomic_set(&cpu->icount_decr.u32, 0);
cpu->can_do_io = 1;
cpu->exception_index = -1;
cpu->crash_occurred = false;