diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2017-10-13 10:50:02 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2017-10-24 13:53:41 -0700 |
| commit | 9b990ee5a3cc6aa38f81266fb0c6ef37a36c45b9 (patch) | |
| tree | ed59ca42a7bfa9d7bac6785f2ad2852d2ef919f9 /accel/tcg/cpu-exec.c | |
| parent | 4e2ca83e71b51577b06b1468e836556912bd5b6e (diff) | |
tcg: Add CPUState cflags_next_tb
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>
Diffstat (limited to 'accel/tcg/cpu-exec.c')
| -rw-r--r-- | accel/tcg/cpu-exec.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index 39ec9508d1..1c64977849 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -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 */ |