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tcg: Add CPUState cflags_next_tb

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We were generating code during tb_invalidate_phys_page_range,
check_watchpoint, cpu_io_recompile, and (seemingly) discarding
the TB, assuming that it would magically be picked up during
the next iteration through the cpu_exec loop.

Instead, record the desired cflags in CPUState so that we request
the proper TB so that there is no more magic.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2017-10-13 10:50:02 -07:00
parent 4e2ca83e71
commit 9b990ee5a3
5 changed files with 31 additions and 35 deletions
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21
accel/tcg/cpu-exec.c
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@ -367,13 +367,12 @@ static inline void tb_add_jump(TranslationBlock *tb, int n,
static inline TranslationBlock *tb_find(CPUState *cpu,
TranslationBlock *last_tb,
int tb_exit)
int tb_exit, uint32_t cf_mask)
{
TranslationBlock *tb;
target_ulong cs_base, pc;
uint32_t flags;
bool acquired_tb_lock = false;
uint32_t cf_mask = curr_cflags();
tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cf_mask);
if (tb == NULL) {
@ -501,7 +500,7 @@ static inline bool cpu_handle_exception(CPUState *cpu, int *ret)
} else if (replay_has_exception()
&& cpu->icount_decr.u16.low + cpu->icount_extra == 0) {
/* try to cause an exception pending in the log */
cpu_exec_nocache(cpu, 1, tb_find(cpu, NULL, 0), true);
cpu_exec_nocache(cpu, 1, tb_find(cpu, NULL, 0, curr_cflags()), true);
*ret = -1;
return true;
#endif
@ -697,7 +696,21 @@ int cpu_exec(CPUState *cpu)
int tb_exit = 0;
while (!cpu_handle_interrupt(cpu, &last_tb)) {
TranslationBlock *tb = tb_find(cpu, last_tb, tb_exit);
uint32_t cflags = cpu->cflags_next_tb;
TranslationBlock *tb;
/* When requested, use an exact setting for cflags for the next
execution. This is used for icount, precise smc, and stop-
after-access watchpoints. Since this request should never
have CF_INVALID set, -1 is a convenient invalid value that
does not require tcg headers for cpu_common_reset. */
if (cflags == -1) {
cflags = curr_cflags();
} else {
cpu->cflags_next_tb = -1;
}
tb = tb_find(cpu, last_tb, tb_exit, cflags);
cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit);
/* Try to align the host and virtual clocks
if the guest is in advance */