target/ppc: Move page crossing check to ppc_tr_translate_insn

With prefixed instructions, the number of instructions
remaining until the page crossing is no longer constant.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210601193528.2533031-3-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 11fd3342a0c7141767201969725f1d0bdfe9d08e..d2c9fd9dd750ccd068c6bf31dd4652babd5f10be 100644 (file)
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -8821,9 +8821,6 @@ static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
 
     if (ctx->singlestep_enabled & (CPU_SINGLE_STEP | GDBSTUB_SINGLE_STEP)) {
         ctx->base.max_insns = 1;
-    } else {
-        int bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4;
-        ctx->base.max_insns = MIN(ctx->base.max_insns, bound);
     }
 }
 
@@ -8874,6 +8871,12 @@ static void ppc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
         gen_invalid(ctx);
     }
 
+    /* End the TB when crossing a page boundary. */
+    if (ctx->base.is_jmp == DISAS_NEXT &&
+        !(ctx->base.pc_next & ~TARGET_PAGE_MASK)) {
+        ctx->base.is_jmp = DISAS_TOO_MANY;
+    }
+
     translator_loop_temp_check(&ctx->base);
 }