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target/openrisc: Exit the TB after l.mtspr 

A store to SR changes interrupt state, which should return
to the main loop to recognize that state.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Richard Henderson 2018-05-22 18:42:13 -07:00 committed by Stafford Horne
parent 2ba6541792
commit 01ec3ec930
1 changed files with 16 additions and 1 deletions
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17
target/openrisc/translate.c
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@ -877,7 +877,22 @@ static bool trans_l_mtspr(DisasContext *dc, arg_l_mtspr *a, uint32_t insn)
if (is_user(dc)) {
gen_illegal_exception(dc);
} else {
TCGv_i32 ti = tcg_const_i32(a->k);
TCGv_i32 ti;
/* For SR, we will need to exit the TB to recognize the new
* exception state. For NPC, in theory this counts as a branch
* (although the SPR only exists for use by an ICE). Save all
* of the cpu state first, allowing it to be overwritten.
*/
if (dc->delayed_branch) {
tcg_gen_mov_tl(cpu_pc, jmp_pc);
tcg_gen_discard_tl(jmp_pc);
} else {
tcg_gen_movi_tl(cpu_pc, dc->base.pc_next + 4);
}
dc->base.is_jmp = DISAS_EXIT;
ti = tcg_const_i32(a->k);
gen_helper_mtspr(cpu_env, cpu_R[a->a], cpu_R[a->b], ti);
tcg_temp_free_i32(ti);
}