target/i386: [tcg] Port to tb_stop

Incrementally paves the way towards using the generic instruction translation
loop.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <150002219289.22386.17959138704858928730.stgit@frigg.lan>
Signed-off-by: Richard Henderson <rth@twiddle.net>

target/i386/translate.c

@@ -8488,8 +8488,6 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
         /* if irq were inhibited with HF_INHIBIT_IRQ_MASK, we clear
            the flag and abort the translation to give the irqs a
            chance to happen */
-        gen_jmp_im(pc_next - dc->cs_base);
-        gen_eob(dc);
         dc->base.is_jmp = DISAS_TOO_MANY;
     } else if ((dc->base.tb->cflags & CF_USE_ICOUNT)
                && ((dc->base.pc_next & TARGET_PAGE_MASK)
@@ -8502,18 +8500,24 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
            If current instruction already crossed the bound - it's ok,
            because an exception hasn't stopped this code.
          */
-        gen_jmp_im(pc_next - dc->cs_base);
-        gen_eob(dc);
         dc->base.is_jmp = DISAS_TOO_MANY;
     } else if ((pc_next - dc->base.pc_first) >= (TARGET_PAGE_SIZE - 32)) {
-        gen_jmp_im(pc_next - dc->cs_base);
-        gen_eob(dc);
         dc->base.is_jmp = DISAS_TOO_MANY;
     }
 
     dc->base.pc_next = pc_next;
 }
 
+static void i386_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
+{
+    DisasContext *dc = container_of(dcbase, DisasContext, base);
+
+    if (dc->base.is_jmp == DISAS_TOO_MANY) {
+        gen_jmp_im(dc->base.pc_next - dc->cs_base);
+        gen_eob(dc);
+    }
+}
+
 /* generate intermediate code for basic block 'tb'.  */
 void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
 {
@@ -8570,23 +8574,21 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
         /* if single step mode, we generate only one instruction and
            generate an exception */
         if (dc->base.singlestep_enabled) {
-            gen_jmp_im(dc->base.pc_next - dc->cs_base);
-            gen_eob(dc);
+            dc->base.is_jmp = DISAS_TOO_MANY;
             break;
         }
         /* if too long translation, stop generation too */
         if (tcg_op_buf_full() ||
             num_insns >= max_insns) {
-            gen_jmp_im(dc->base.pc_next - dc->cs_base);
-            gen_eob(dc);
+            dc->base.is_jmp = DISAS_TOO_MANY;
             break;
         }
         if (singlestep) {
-            gen_jmp_im(dc->base.pc_next - dc->cs_base);
-            gen_eob(dc);
+            dc->base.is_jmp = DISAS_TOO_MANY;
             break;
         }
     }
+    i386_tr_tb_stop(&dc->base, cs);
     if (tb->cflags & CF_LAST_IO)
         gen_io_end();
     gen_tb_end(tb, num_insns);