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target/sparc: Restore ldstub of odd asis

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Fixes the booting of ss20 roms.

Backports commit f61f76cb3ff9fea6ecbcb9696ed82b3e2c5b7364 from qemu
This commit is contained in:
Richard Henderson 2018-03-01 09:20:35 -05:00 committed by Lioncash
parent 9404dbf74e
commit f6a72d4dca
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 26 additions and 2 deletions
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28
qemu/target-sparc/translate.c
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@ -2574,6 +2574,7 @@ static void gen_cas_asi(DisasContext *dc, TCGv addr, TCGv cmpv,
static void gen_ldstub_asi(DisasContext *dc, TCGv dst, TCGv addr, int insn)
{
TCGContext *tcg_ctx = dc->uc->tcg_ctx;
DisasASI da = get_asi(dc, insn, MO_UB);
switch (da.type) {
@ -2583,8 +2584,31 @@ static void gen_ldstub_asi(DisasContext *dc, TCGv dst, TCGv addr, int insn)
gen_ldstub(dc, dst, addr, da.mem_idx);
break;
default:
/* ??? Should be DAE_invalid_asi. */
gen_exception(dc, TT_DATA_ACCESS);
/* ??? In theory, this should be raise DAE_invalid_asi.
But the SS-20 roms do ldstuba [%l0] #ASI_M_CTL, %o1. */
if (dc->uc->parallel_cpus) {
gen_helper_exit_atomic(tcg_ctx, tcg_ctx->cpu_env);
} else {
TCGv_i32 r_asi = tcg_const_i32(tcg_ctx, da.asi);
TCGv_i32 r_mop = tcg_const_i32(tcg_ctx, MO_UB);
TCGv_i64 s64, t64;
save_state(dc);
t64 = tcg_temp_new_i64(tcg_ctx);
gen_helper_ld_asi(tcg_ctx, t64, tcg_ctx->cpu_env, addr, r_asi, r_mop);
s64 = tcg_const_i64(tcg_ctx, 0xff);
gen_helper_st_asi(tcg_ctx, tcg_ctx->cpu_env, addr, s64, r_asi, r_mop);
tcg_temp_free_i64(tcg_ctx, s64);
tcg_temp_free_i32(tcg_ctx, r_mop);
tcg_temp_free_i32(tcg_ctx, r_asi);
tcg_gen_trunc_i64_tl(tcg_ctx, dst, t64);
tcg_temp_free_i64(tcg_ctx, t64);
/* End the TB. */
dc->npc = DYNAMIC_PC;
}
break;
}
}