[PATCH] target/arm: Fix assert on BRA.

[Harald van Dijk]

trans_BRA does

    gen_a64_set_pc(s, dst);
    set_btype_for_br(s, a->rn);

gen_a64_set_pc does

    s->pc_save = -1;

set_btype_for_br (if aa64_bti is enabled and the register is not x16 or
x17) does

    gen_pc_plus_diff(s, pc, 0);

gen_pc_plus_diff does

    assert(s->pc_save != -1);

Hence, this assert is getting hit. We need to call set_btype_for_br
before gen_a64_set_pc, and there is nothing in set_btype_for_br that
depends on gen_a64_set_pc having already been called, so this commit
simply swaps the calls.
---
 target/arm/tcg/translate-a64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 08b21d7dbf..cde22a5cca 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -1916,8 +1916,8 @@ static bool trans_BRA(DisasContext *s, arg_bra *a)
         return false;
     }
     dst = auth_branch_target(s, cpu_reg(s,a->rn), cpu_reg_sp(s, a->rm), !a->m);
-    gen_a64_set_pc(s, dst);
     set_btype_for_br(s, a->rn);
+    gen_a64_set_pc(s, dst);
     s->base.is_jmp = DISAS_JUMP;
     return true;
 }
-- 
2.47.3