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[06/26] target/s390x: implement LOAD PAIR FROM QUADWORD

Message ID 20170525210508.4910-7-aurelien@aurel32.net (mailing list archive)
State New, archived
Headers show

Commit Message

Aurelien Jarno May 25, 2017, 9:04 p.m. UTC 
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 target/s390x/insn-data.def |  2 ++
 target/s390x/translate.c   | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

Comments

Richard Henderson May 26, 2017, 2:02 p.m. UTC | #1 
On 05/25/2017 02:04 PM, Aurelien Jarno wrote:
> +static ExitStatus op_lpq(DisasContext *s, DisasOps *o)
> +{
> +    /* In a parallel context, stop the world and single step.  */
> +    if (parallel_cpus) {
> +        potential_page_fault(s);
> +        gen_exception(EXCP_ATOMIC);
> +        return EXIT_NORETURN;
> +    }
> +
> +    /* In a serial context, perform the two loads ... */
> +    tcg_gen_qemu_ld64(o->out, o->in2, get_mem_index(s));
> +    tcg_gen_addi_i64(o->in2, o->in2, 8);
> +    tcg_gen_qemu_ld64(o->out2, o->in2, get_mem_index(s));
> +    return NO_EXIT;
> +}

This can be implemented in a parallel context with helper_atomic_ldo_be_mmu, 
though that must be done with a helper function.


r~
diff mbox

Patch

diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index f92bfde4f8..53c86d5832 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -507,6 +507,8 @@ 
 /* 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 PAIR FROM QUADWORD */
+    C(0xe38f, LPQ,     RXY_a, Z,   0, a2, r1_P, 0, lpq, 0)
 /* 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 624e8667d7..09052972f1 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -2827,6 +2827,22 @@  static ExitStatus op_lpd(DisasContext *s, DisasOps *o)
     return NO_EXIT;
 }
 
+static ExitStatus op_lpq(DisasContext *s, DisasOps *o)
+{
+    /* In a parallel context, stop the world and single step.  */
+    if (parallel_cpus) {
+        potential_page_fault(s);
+        gen_exception(EXCP_ATOMIC);
+        return EXIT_NORETURN;
+    }
+
+    /* In a serial context, perform the two loads ... */
+    tcg_gen_qemu_ld64(o->out, o->in2, get_mem_index(s));
+    tcg_gen_addi_i64(o->in2, o->in2, 8);
+    tcg_gen_qemu_ld64(o->out2, o->in2, get_mem_index(s));
+    return NO_EXIT;
+}
+
 #ifndef CONFIG_USER_ONLY
 static ExitStatus op_lura(DisasContext *s, DisasOps *o)
 {