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cpu-exec: fix cpu_exec_nocache 

In icount mode cpu_exec_nocache function is used to execute part of the
existing TB. At the end of cpu_exec_nocache newly created TB is deleted.
Sometimes io_read function needs to recompile current TB and restart TB
lookup and execution. After that tb_find_fast function finds old (bigger)
TB again. This TB cannot be executed (because icount is not big enough)
and cpu_exec_nocache is called again. Such a loop continues over and over.
This patch deletes old TB and avoids finding it in the TB cache.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2014-11-26 13:38:52 +03:00 committed by Paolo Bonzini
parent f8e1f53334
commit b4ac20b4df
1 changed files with 6 additions and 1 deletions
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7
cpu-exec.c
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@ -202,13 +202,18 @@ static void cpu_exec_nocache(CPUArchState *env, int max_cycles,
{
CPUState *cpu = ENV_GET_CPU(env);
TranslationBlock *tb;
target_ulong pc = orig_tb->pc;
target_ulong cs_base = orig_tb->cs_base;
uint64_t flags = orig_tb->flags;
/* Should never happen.
We only end up here when an existing TB is too long. */
if (max_cycles > CF_COUNT_MASK)
max_cycles = CF_COUNT_MASK;
tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, orig_tb->flags,
/* tb_gen_code can flush our orig_tb, invalidate it now */
tb_phys_invalidate(orig_tb, -1);
tb = tb_gen_code(cpu, pc, cs_base, flags,
max_cycles);
cpu->current_tb = tb;
/* execute the generated code */