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target/xtensa: extract test for window underflow exception

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- mark retw and retw.n instructions;
- extract window inderflow test from retw helper;
- put underflow exception check generation right after the overflow
  check;

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2018-08-30 17:55:33 -07:00
parent 6416d16f75
commit f473019a97
3 changed files with 25 additions and 9 deletions
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target/xtensa/helper.h
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@ -6,6 +6,7 @@ DEF_HELPER_3(debug_exception, noreturn, env, i32, i32)
DEF_HELPER_2(wsr_windowbase, void, env, i32)
DEF_HELPER_4(entry, void, env, i32, i32, i32)
DEF_HELPER_2(test_ill_retw, void, env, i32)
DEF_HELPER_2(test_underflow_retw, void, env, i32)
DEF_HELPER_2(retw, i32, env, i32)
DEF_HELPER_2(rotw, void, env, i32)
DEF_HELPER_3(window_check, noreturn, env, i32, i32)