target/xtensa: extract test for window overflow exception

- add ps.callinc to the TB flags, that allows testing all instructions
  for window overflow statically;
- drop gen_window_check* functions; replace them with get_window_check
  that accepts bitmask of used registers;
- add XtensaOpcodeOps::test_overflow that returns bitmask of implicitly
  used registers; use it for entry and call{,x}{4,8,12};
- drop window overflow test from the entry helper;
- drop parameter 0 from translate_[di]cache and use translate_nop for
  d/i cache opcodes that don't need memory accessibility check;
- add bitmask XtensaOpcodeOps::windowed_register_op that marks opcode
  arguments that refer to windowed registers;
- translate windowed_register_op mask to a mask of actually used
  registers in the disassembly loop;
- add check for window overflow right after the check for debug
  exception;

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/target/xtensa/op_helper.c b/target/xtensa/op_helper.c
index f5520659d8..68052851af 100644
--- a/target/xtensa/op_helper.c
+++ b/target/xtensa/op_helper.c
@@ -253,12 +253,7 @@ void HELPER(wsr_windowbase)(CPUXtensaState *env, uint32_t v)
 void HELPER(entry)(CPUXtensaState *env, uint32_t pc, uint32_t s, uint32_t imm)
 {
     int callinc = (env->sregs[PS] & PS_CALLINC) >> PS_CALLINC_SHIFT;
-    uint32_t windowstart = xtensa_replicate_windowstart(env) >>
-        (env->sregs[WINDOW_BASE] + 1);
 
-    if (windowstart & ((1 << callinc) - 1)) {
-        HELPER(window_check)(env, pc, callinc);
-    }
     env->regs[(callinc << 2) | (s & 3)] = env->regs[s] - imm;
     xtensa_rotate_window(env, callinc);
     env->sregs[WINDOW_START] |=