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target/s390x: Fix LAALG not updating cc_src

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LAALG uses op_laa() and wout_addu64(). The latter expects cc_src to be
set, but the former does not do it. This can lead to assertion failures
if something sets cc_src to neither 0 nor 1 before.

Fix by introducing op_laa_addu64(), which sets cc_src, and using it for
LAALG.

Fixes: 4dba4d6fef ("target/s390x: Use atomic operations for LOAD AND OP")
Cc: qemu-stable@nongnu.org
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20231106093605.1349201-4-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Ilya Leoshkevich 2023-11-06 10:31:24 +01:00 committed by Thomas Huth
parent 43fecbe7a5
commit bea402482a
2 changed files with 18 additions and 3 deletions
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2
target/s390x/tcg/insn-data.h.inc
View File

@ -442,7 +442,7 @@
D(0xebe8, LAAG, RSY_a, ILA, r3, a2, new, in2_r1, laa, adds64, MO_TEUQ)
/* LOAD AND ADD LOGICAL */
D(0xebfa, LAAL, RSY_a, ILA, r3_32u, a2, new, in2_r1_32, laa, addu32, MO_TEUL)
D(0xebea, LAALG, RSY_a, ILA, r3, a2, new, in2_r1, laa, addu64, MO_TEUQ)
D(0xebea, LAALG, RSY_a, ILA, r3, a2, new, in2_r1, laa_addu64, addu64, MO_TEUQ)
/* LOAD AND AND */
D(0xebf4, LAN, RSY_a, ILA, r3_32s, a2, new, in2_r1_32, lan, nz32, MO_TESL)
D(0xebe4, LANG, RSY_a, ILA, r3, a2, new, in2_r1, lan, nz64, MO_TEUQ)

17
target/s390x/tcg/translate.c
View File

@ -2677,17 +2677,32 @@ static DisasJumpType op_kxb(DisasContext *s, DisasOps *o)
return DISAS_NEXT;
}
static DisasJumpType op_laa(DisasContext *s, DisasOps *o)
static DisasJumpType help_laa(DisasContext *s, DisasOps *o, bool addu64)
{
/* The real output is indeed the original value in memory;
recompute the addition for the computation of CC. */
tcg_gen_atomic_fetch_add_i64(o->in2, o->in2, o->in1, get_mem_index(s),
s->insn->data | MO_ALIGN);
/* However, we need to recompute the addition for setting CC. */
if (addu64) {
tcg_gen_movi_i64(cc_src, 0);
tcg_gen_add2_i64(o->out, cc_src, o->in1, cc_src, o->in2, cc_src);
} else {
tcg_gen_add_i64(o->out, o->in1, o->in2);
}
return DISAS_NEXT;
}
static DisasJumpType op_laa(DisasContext *s, DisasOps *o)
{
return help_laa(s, o, false);
}
static DisasJumpType op_laa_addu64(DisasContext *s, DisasOps *o)
{
return help_laa(s, o, true);
}
static DisasJumpType op_lan(DisasContext *s, DisasOps *o)
{
/* The real output is indeed the original value in memory;