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target/xtensa: only rotate window in the retw helper

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Move return address calculation and WINDOW_START adjustment out of the
retw helper to simplify logic a bit and avoid using registers directly.
Pass a0 as a parameter to the helper.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2019-02-11 12:22:29 -08:00
parent 8df3fd3596
commit c949009bc0
3 changed files with 10 additions and 9 deletions
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9
target/xtensa/translate.c
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@ -2227,8 +2227,13 @@ static bool test_ill_retw(DisasContext *dc, const uint32_t arg[],
static void translate_retw(DisasContext *dc, const uint32_t arg[],
const uint32_t par[])
{
TCGv_i32 tmp = tcg_const_i32(dc->pc);
gen_helper_retw(tmp, cpu_env, tmp);
TCGv_i32 tmp = tcg_const_i32(1);
tcg_gen_shl_i32(tmp, tmp, cpu_SR[WINDOW_BASE]);
tcg_gen_andc_i32(cpu_SR[WINDOW_START],
cpu_SR[WINDOW_START], tmp);
tcg_gen_movi_i32(tmp, dc->pc);
tcg_gen_deposit_i32(tmp, tmp, cpu_R[0], 0, 30);
gen_helper_retw(cpu_env, cpu_R[0]);
gen_jump(dc, tmp);
tcg_temp_free(tmp);
}