target/arm: [tcg,a64] Port to init_disas_context

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

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Alex Benneé <alex.benee@linaro.org>
Message-Id: <150002340430.22386.10889954302345646107.stgit@frigg.lan>
[rth: Adjust for max_insns interface change.]
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 24 insertions, 14 deletions

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index f5c678e..e8dc96c 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -11200,21 +11200,12 @@ static void disas_a64_insn(CPUARMState *env, DisasContext *s)
     free_tmp_a64(s);
 }
 
-void gen_intermediate_code_a64(DisasContextBase *dcbase, CPUState *cs,
-                               TranslationBlock *tb)
+static int aarch64_tr_init_disas_context(DisasContextBase *dcbase,
+                                         CPUState *cpu, int max_insns)
 {
-    CPUARMState *env = cs->env_ptr;
-    ARMCPU *cpu = arm_env_get_cpu(env);
     DisasContext *dc = container_of(dcbase, DisasContext, base);
-    target_ulong next_page_start;
-    int max_insns;
-
-    dc->base.tb = tb;
-    dc->base.pc_first = dc->base.tb->pc;
-    dc->base.pc_next = dc->base.pc_first;
-    dc->base.is_jmp = DISAS_NEXT;
-    dc->base.num_insns = 0;
-    dc->base.singlestep_enabled = cs->singlestep_enabled;
+    CPUARMState *env = cpu->env_ptr;
+    ARMCPU *arm_cpu = arm_env_get_cpu(env);
 
     dc->pc = dc->base.pc_first;
     dc->condjmp = 0;
@@ -11240,7 +11231,7 @@ void gen_intermediate_code_a64(DisasContextBase *dcbase, CPUState *cs,
     dc->fp_excp_el = ARM_TBFLAG_FPEXC_EL(dc->base.tb->flags);
     dc->vec_len = 0;
     dc->vec_stride = 0;
-    dc->cp_regs = cpu->cp_regs;
+    dc->cp_regs = arm_cpu->cp_regs;
     dc->features = env->features;
 
     /* Single step state. The code-generation logic here is:
@@ -11265,6 +11256,24 @@ void gen_intermediate_code_a64(DisasContextBase *dcbase, CPUState *cs,
 
     init_tmp_a64_array(dc);
 
+    return max_insns;
+}
+
+void gen_intermediate_code_a64(DisasContextBase *dcbase, CPUState *cs,
+                               TranslationBlock *tb)
+{
+    CPUARMState *env = cs->env_ptr;
+    DisasContext *dc = container_of(dcbase, DisasContext, base);
+    target_ulong next_page_start;
+    int max_insns;
+
+    dc->base.tb = tb;
+    dc->base.pc_first = dc->base.tb->pc;
+    dc->base.pc_next = dc->base.pc_first;
+    dc->base.is_jmp = DISAS_NEXT;
+    dc->base.num_insns = 0;
+    dc->base.singlestep_enabled = cs->singlestep_enabled;
+
     next_page_start = (dc->base.pc_first & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
     max_insns = dc->base.tb->cflags & CF_COUNT_MASK;
     if (max_insns == 0) {
@@ -11273,6 +11282,7 @@ void gen_intermediate_code_a64(DisasContextBase *dcbase, CPUState *cs,
     if (max_insns > TCG_MAX_INSNS) {
         max_insns = TCG_MAX_INSNS;
     }
+    max_insns = aarch64_tr_init_disas_context(&dc->base, cs, max_insns);
 
     gen_tb_start(tb);