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accel/tcg: Fix tb_invalidate_phys_page_unwind 

When called from syscall(), we are not within a TB and pc == 0.
We can skip the check for invalidating the current TB.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2022-12-24 04:35:22 -08:00
parent cee44b037b
commit 1b660f42ef
1 changed files with 43 additions and 35 deletions
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78
accel/tcg/tb-maint.c
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@ -1024,43 +1024,51 @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
*/
bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
{
assert(pc != 0);
#ifdef TARGET_HAS_PRECISE_SMC
assert_memory_lock();
{
TranslationBlock *current_tb = tcg_tb_lookup(pc);
bool current_tb_modified = false;
TranslationBlock *tb;
PageForEachNext n;
TranslationBlock *current_tb;
bool current_tb_modified;
TranslationBlock *tb;
PageForEachNext n;
addr &= TARGET_PAGE_MASK;
PAGE_FOR_EACH_TB(addr, addr + TARGET_PAGE_SIZE, unused, tb, n) {
if (current_tb == tb &&
(tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
/*
* If we are modifying the current TB, we must stop its
* execution. We could be more precise by checking that
* the modification is after the current PC, but it would
* require a specialized function to partially restore
* the CPU state.
*/
current_tb_modified = true;
cpu_restore_state_from_tb(current_cpu, current_tb, pc);
}
tb_phys_invalidate__locked(tb);
}
if (current_tb_modified) {
/* Force execution of one insn next time. */
CPUState *cpu = current_cpu;
cpu->cflags_next_tb = 1 | CF_NOIRQ | curr_cflags(current_cpu);
return true;
}
/*
* Without precise smc semantics, or when outside of a TB,
* we can skip to invalidate.
*/
#ifndef TARGET_HAS_PRECISE_SMC
pc = 0;
#endif
if (!pc) {
tb_invalidate_phys_page(addr);
return false;
}
assert_memory_lock();
current_tb = tcg_tb_lookup(pc);
addr &= TARGET_PAGE_MASK;
current_tb_modified = false;
PAGE_FOR_EACH_TB(addr, addr + TARGET_PAGE_SIZE, unused, tb, n) {
if (current_tb == tb &&
(tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
/*
* If we are modifying the current TB, we must stop its
* execution. We could be more precise by checking that
* the modification is after the current PC, but it would
* require a specialized function to partially restore
* the CPU state.
*/
current_tb_modified = true;
cpu_restore_state_from_tb(current_cpu, current_tb, pc);
}
tb_phys_invalidate__locked(tb);
}
if (current_tb_modified) {
/* Force execution of one insn next time. */
CPUState *cpu = current_cpu;
cpu->cflags_next_tb = 1 | CF_NOIRQ | curr_cflags(current_cpu);
return true;
}
#else
tb_invalidate_phys_page(addr);
#endif /* TARGET_HAS_PRECISE_SMC */
return false;
}
#else