[PULL 3/7] target/xtensa: Make sure that tb->size != 0

[Cornelia Huck <cohuck@redhat.com>]

From: Ilya Leoshkevich <iii@linux.ibm.com>

tb_gen_code() assumes that tb->size must never be zero, otherwise it
may produce spurious exceptions. For xtensa this may happen when
decoding an unknown instruction, when handling a write into the
CCOUNT or CCOMPARE special register and when single-stepping the first
instruction of an exception handler.

Fix by pretending that the size of the respective translation block is
1 in all these cases.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Message-Id: <20210416154939.32404-4-iii@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---
 target/xtensa/translate.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/xtensa/translate.c b/target/xtensa/translate.c
index 0ae4efc48a17..73584d9d605b 100644
--- a/target/xtensa/translate.c
+++ b/target/xtensa/translate.c
@@ -917,6 +917,7 @@ static void disas_xtensa_insn(CPUXtensaState *env, DisasContext *dc)
                       "unknown instruction length (pc = %08x)\n",
                       dc->pc);
         gen_exception_cause(dc, ILLEGAL_INSTRUCTION_CAUSE);
+        dc->base.pc_next = dc->pc + 1;
         return;
     }
 
@@ -1274,11 +1275,13 @@ static void xtensa_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
     if ((tb_cflags(dc->base.tb) & CF_USE_ICOUNT)
         && (dc->base.tb->flags & XTENSA_TBFLAG_YIELD)) {
         gen_exception(dc, EXCP_YIELD);
+        dc->base.pc_next = dc->pc + 1;
         dc->base.is_jmp = DISAS_NORETURN;
         return;
     }
     if (dc->base.tb->flags & XTENSA_TBFLAG_EXCEPTION) {
         gen_exception(dc, EXCP_DEBUG);
+        dc->base.pc_next = dc->pc + 1;
         dc->base.is_jmp = DISAS_NORETURN;
         return;
     }
-- 
2.30.2