[PATCH v3 12/27] target/s390x: Use gen_psw_addr_disp in op_sam

[Richard Henderson]

Complicated because we may now require a runtime jump.

Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/s390x/tcg/translate.c | 40 +++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 12 deletions(-)

diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index 001cfa9162..624bd18735 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -3924,7 +3924,7 @@ static DisasJumpType op_sacf(DisasContext *s, DisasOps *o)
 static DisasJumpType op_sam(DisasContext *s, DisasOps *o)
 {
     int sam = s->insn->data;
-    TCGv_i64 tsam;
+    TCGLabel *fault = NULL;
     uint64_t mask;
 
     switch (sam) {
@@ -3939,20 +3939,36 @@ static DisasJumpType op_sam(DisasContext *s, DisasOps 
*o)
         break;
     }
 
-    /* Bizarre but true, we check the address of the current insn for the
-       specification exception, not the next to be executed.  Thus the PoO
-       documents that Bad Things Happen two bytes before the end.  */
-    if (s->base.pc_next & ~mask) {
-        gen_program_exception(s, PGM_SPECIFICATION);
-        return DISAS_NORETURN;
-    }
-    s->pc_tmp &= mask;
+    /*
+     * Bizarre but true, we check the address of the current insn for the
+     * specification exception, not the next to be executed.  Thus the PoO
+     * documents that Bad Things Happen two bytes before the end.
+     */
+    if (mask != -1) {
+        TCGv_i64 t = tcg_temp_new_i64();
+        fault = gen_new_label();
 
-    tsam = tcg_constant_i64(sam);
-    tcg_gen_deposit_i64(psw_mask, psw_mask, tsam, 31, 2);
+        gen_psw_addr_disp(s, t, 0);
+        tcg_gen_andi_i64(t, t, ~mask);
+        tcg_gen_brcondi_i64(TCG_COND_NE, t, 0, fault);
+        tcg_temp_free_i64(t);
+    }
+
+    update_cc_op(s);
+
+    tcg_gen_deposit_i64(psw_mask, psw_mask, tcg_constant_i64(sam), 31, 2);
+
+    gen_psw_addr_disp(s, psw_addr, s->ilen);
+    tcg_gen_andi_i64(psw_addr, psw_addr, mask);
 
     /* Always exit the TB, since we (may have) changed execution mode.  */
-    return DISAS_TOO_MANY;
+    tcg_gen_lookup_and_goto_ptr();
+
+    if (mask != -1) {
+        gen_set_label(fault);
+        gen_program_exception(s, PGM_SPECIFICATION);
+    }
+    return DISAS_NORETURN;
 }
 
 static DisasJumpType op_sar(DisasContext *s, DisasOps *o)
-- 
2.34.1