target-arm: Remove unnecessary code now read/write fns can't fail

Now that cpreg read and write functions can't fail and throw an
exception, we can remove the code from the translator that synchronises
the guest PC in case an exception is thrown.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target-arm/translate-a64.c

@@ -1231,7 +1231,6 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
             tcg_gen_movi_i64(tcg_rt, ri->resetvalue);
         } else if (ri->readfn) {
             TCGv_ptr tmpptr;
-            gen_a64_set_pc_im(s->pc - 4);
             tmpptr = tcg_const_ptr(ri);
             gen_helper_get_cp_reg64(tcg_rt, cpu_env, tmpptr);
             tcg_temp_free_ptr(tmpptr);
@@ -1244,7 +1243,6 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
             return;
         } else if (ri->writefn) {
             TCGv_ptr tmpptr;
-            gen_a64_set_pc_im(s->pc - 4);
             tmpptr = tcg_const_ptr(ri);
             gen_helper_set_cp_reg64(cpu_env, tmpptr, tcg_rt);
             tcg_temp_free_ptr(tmpptr);

target-arm/translate.c

@@ -6876,7 +6876,6 @@ static int disas_coproc_insn(CPUARMState * env, DisasContext *s, uint32_t insn)
                     tmp64 = tcg_const_i64(ri->resetvalue);
                 } else if (ri->readfn) {
                     TCGv_ptr tmpptr;
-                    gen_set_pc_im(s, s->pc);
                     tmp64 = tcg_temp_new_i64();
                     tmpptr = tcg_const_ptr(ri);
                     gen_helper_get_cp_reg64(tmp64, cpu_env, tmpptr);
@@ -6899,7 +6898,6 @@ static int disas_coproc_insn(CPUARMState * env, DisasContext *s, uint32_t insn)
                     tmp = tcg_const_i32(ri->resetvalue);
                 } else if (ri->readfn) {
                     TCGv_ptr tmpptr;
-                    gen_set_pc_im(s, s->pc);
                     tmp = tcg_temp_new_i32();
                     tmpptr = tcg_const_ptr(ri);
                     gen_helper_get_cp_reg(tmp, cpu_env, tmpptr);
@@ -6934,7 +6932,6 @@ static int disas_coproc_insn(CPUARMState * env, DisasContext *s, uint32_t insn)
                 tcg_temp_free_i32(tmphi);
                 if (ri->writefn) {
                     TCGv_ptr tmpptr = tcg_const_ptr(ri);
-                    gen_set_pc_im(s, s->pc);
                     gen_helper_set_cp_reg64(cpu_env, tmpptr, tmp64);
                     tcg_temp_free_ptr(tmpptr);
                 } else {
@@ -6945,7 +6942,6 @@ static int disas_coproc_insn(CPUARMState * env, DisasContext *s, uint32_t insn)
                 if (ri->writefn) {
                     TCGv_i32 tmp;
                     TCGv_ptr tmpptr;
-                    gen_set_pc_im(s, s->pc);
                     tmp = load_reg(s, rt);
                     tmpptr = tcg_const_ptr(ri);
                     gen_helper_set_cp_reg(cpu_env, tmpptr, tmp);