| Message ID | 20170509180715.22910-5-rth@twiddle.net (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 2017-05-09 11:07, Richard Henderson wrote: > From: Eric Bischoff <ebischoff@nerim.net> > > Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> > Signed-off-by: Eric Bischoff <ebischoff@nerim.net> > Message-Id: <20170228120134.7921-1-ebischoff@suse.com> > [rth: Combine the two via insn->data; free the address temps.] > Signed-off-by: Richard Henderson <rth@twiddle.net> > --- > target/s390x/insn-data.def | 4 +++- > target/s390x/translate.c | 42 ++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 45 insertions(+), 1 deletion(-) [snip] > diff --git a/target/s390x/translate.c b/target/s390x/translate.c > index 2b66a4e..8de0177 100644 > --- a/target/s390x/translate.c > +++ b/target/s390x/translate.c > @@ -2559,6 +2559,7 @@ static ExitStatus op_lctlg(DisasContext *s, DisasOps *o) > tcg_temp_free_i32(r3); > return NO_EXIT; > } > + > static ExitStatus op_lra(DisasContext *s, DisasOps *o) > { > check_privileged(s); > @@ -2759,6 +2760,31 @@ static ExitStatus op_lm64(DisasContext *s, DisasOps *o) > return NO_EXIT; > } > > +static ExitStatus op_lpd(DisasContext *s, DisasOps *o) > +{ > + TCGv_i64 a1, a2; > + TCGMemOp mop = s->insn->data; > + > + /* In a parallel context, stop the world and single step. */ > + if (parallel_cpus) { > + potential_page_fault(s); > + gen_helper_exit_atomic(cpu_env); > + return EXIT_NORETURN; > + } One small additional comment about this patch I haven't spotted at the first review. The exit_atomic helper is properly restoring the CPU state passing the return address to cpu_loop_exit_atomic, so I believe the potential_page_fault call is not necessary. That said, it doesn't hurt either. Aurelien
Le mercredi 10 mai 2017, 12:16:20 Aurelien Jarno a écrit : > > + /* In a parallel context, stop the world and single step. */ > > + if (parallel_cpus) { > > + potential_page_fault(s); > > + gen_helper_exit_atomic(cpu_env); > > + return EXIT_NORETURN; > > + } > > One small additional comment about this patch I haven't spotted at the > first review. The exit_atomic helper is properly restoring the CPU state > passing the return address to cpu_loop_exit_atomic, so I believe the > potential_page_fault call is not necessary. That said, it doesn't hurt > either. Merci pour la relecture Aurélien. Richard, what do we do? We remove the potential_page_fault(s); or not?
On 05/10/2017 10:13 AM, Éric Bischoff wrote: > Le mercredi 10 mai 2017, 12:16:20 Aurelien Jarno a écrit : >>> + /* In a parallel context, stop the world and single step. */ >>> + if (parallel_cpus) { >>> + potential_page_fault(s); >>> + gen_helper_exit_atomic(cpu_env); >>> + return EXIT_NORETURN; >>> + } >> >> One small additional comment about this patch I haven't spotted at the >> first review. The exit_atomic helper is properly restoring the CPU state >> passing the return address to cpu_loop_exit_atomic, so I believe the >> potential_page_fault call is not necessary. That said, it doesn't hurt >> either. > > Merci pour la relecture Aurélien. > > Richard, what do we do? We remove the potential_page_fault(s); or not? I'm thinking of using gen_exception(EXCP_ATOMIC) instead. The unwind associated with the regular helper_exit_atomic has more overhead than potential_page_fault(). r~
On 2017-05-10 10:43, Richard Henderson wrote: > On 05/10/2017 10:13 AM, Éric Bischoff wrote: > > Le mercredi 10 mai 2017, 12:16:20 Aurelien Jarno a écrit : > > > > + /* In a parallel context, stop the world and single step. */ > > > > + if (parallel_cpus) { > > > > + potential_page_fault(s); > > > > + gen_helper_exit_atomic(cpu_env); > > > > + return EXIT_NORETURN; > > > > + } > > > > > > One small additional comment about this patch I haven't spotted at the > > > first review. The exit_atomic helper is properly restoring the CPU state > > > passing the return address to cpu_loop_exit_atomic, so I believe the > > > potential_page_fault call is not necessary. That said, it doesn't hurt > > > either. > > > > Merci pour la relecture Aurélien. > > > > Richard, what do we do? We remove the potential_page_fault(s); or not? > > I'm thinking of using gen_exception(EXCP_ATOMIC) instead. > The unwind associated with the regular helper_exit_atomic > has more overhead than potential_page_fault(). That was just a remark to optimize the code a bit. That said I think the current code can go like that, it is not wrong.
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def index 43c5707..0909060 100644 --- a/target/s390x/insn-data.def +++ b/target/s390x/insn-data.def @@ -504,7 +504,9 @@ C(0xb9e2, LOCGR, RRF_c, LOC, r1, r2, r1, 0, loc, 0) C(0xebf2, LOC, RSY_b, LOC, r1, m2_32u, new, r1_32, loc, 0) C(0xebe2, LOCG, RSY_b, LOC, r1, m2_64, r1, 0, loc, 0) -/* LOAD PAIR DISJOINT TODO */ +/* LOAD PAIR DISJOINT */ + D(0xc804, LPD, SSF, ILA, 0, 0, new_P, r3_P32, lpd, 0, MO_TEUL) + D(0xc805, LPDG, SSF, ILA, 0, 0, new_P, r3_P64, lpd, 0, MO_TEQ) /* LOAD POSITIVE */ C(0x1000, LPR, RR_a, Z, 0, r2_32s, new, r1_32, abs, abs32) C(0xb900, LPGR, RRE, Z, 0, r2, r1, 0, abs, abs64) diff --git a/target/s390x/translate.c b/target/s390x/translate.c index 2b66a4e..8de0177 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -2559,6 +2559,7 @@ static ExitStatus op_lctlg(DisasContext *s, DisasOps *o) tcg_temp_free_i32(r3); return NO_EXIT; } + static ExitStatus op_lra(DisasContext *s, DisasOps *o) { check_privileged(s); @@ -2759,6 +2760,31 @@ static ExitStatus op_lm64(DisasContext *s, DisasOps *o) return NO_EXIT; } +static ExitStatus op_lpd(DisasContext *s, DisasOps *o) +{ + TCGv_i64 a1, a2; + TCGMemOp mop = s->insn->data; + + /* In a parallel context, stop the world and single step. */ + if (parallel_cpus) { + potential_page_fault(s); + gen_helper_exit_atomic(cpu_env); + return EXIT_NORETURN; + } + + /* In a serial context, perform the two loads ... */ + a1 = get_address(s, 0, get_field(s->fields, b1), get_field(s->fields, d1)); + a2 = get_address(s, 0, get_field(s->fields, b2), get_field(s->fields, d2)); + tcg_gen_qemu_ld_i64(o->out, a1, get_mem_index(s), mop | MO_ALIGN); + tcg_gen_qemu_ld_i64(o->out2, a2, get_mem_index(s), mop | MO_ALIGN); + tcg_temp_free_i64(a1); + tcg_temp_free_i64(a2); + + /* ... and indicate that we performed them while interlocked. */ + gen_op_movi_cc(s, 0); + return NO_EXIT; +} + #ifndef CONFIG_USER_ONLY static ExitStatus op_lura(DisasContext *s, DisasOps *o) { @@ -4430,6 +4456,22 @@ static void wout_r1_D32(DisasContext *s, DisasFields *f, DisasOps *o) } #define SPEC_wout_r1_D32 SPEC_r1_even +static void wout_r3_P32(DisasContext *s, DisasFields *f, DisasOps *o) +{ + int r3 = get_field(f, r3); + store_reg32_i64(r3, o->out); + store_reg32_i64(r3 + 1, o->out2); +} +#define SPEC_wout_r3_P32 SPEC_r3_even + +static void wout_r3_P64(DisasContext *s, DisasFields *f, DisasOps *o) +{ + int r3 = get_field(f, r3); + store_reg(r3, o->out); + store_reg(r3 + 1, o->out2); +} +#define SPEC_wout_r3_P64 SPEC_r3_even + static void wout_e1(DisasContext *s, DisasFields *f, DisasOps *o) { store_freg32_i64(get_field(f, r1), o->out);