Queued tcg patches

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Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20171103' into staging

Queued tcg patches

# gpg: Signature made Fri 03 Nov 2017 08:37:58 GMT
# gpg:                using RSA key 0x64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20171103:
  cpu-exec: Exit exclusive region on longjmp from step_atomic
  tcg/s390x: Use constant pool for prologue
  tcg: Allow constant pool entries in the prologue

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

accel/tcg/cpu-exec.c

@@ -233,6 +233,8 @@ void cpu_exec_step_atomic(CPUState *cpu)
     uint32_t flags;
     uint32_t cflags = 1;
     uint32_t cf_mask = cflags & CF_HASH_MASK;
+    /* volatile because we modify it between setjmp and longjmp */
+    volatile bool in_exclusive_region = false;
 
     if (sigsetjmp(cpu->jmp_env, 0) == 0) {
         tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cf_mask);
@@ -251,14 +253,12 @@ void cpu_exec_step_atomic(CPUState *cpu)
 
         /* Since we got here, we know that parallel_cpus must be true.  */
         parallel_cpus = false;
+        in_exclusive_region = true;
         cc->cpu_exec_enter(cpu);
         /* execute the generated code */
         trace_exec_tb(tb, pc);
         cpu_tb_exec(cpu, tb);
         cc->cpu_exec_exit(cpu);
-        parallel_cpus = true;
-
-        end_exclusive();
     } else {
         /* We may have exited due to another problem here, so we need
          * to reset any tb_locks we may have taken but didn't release.
@@ -270,6 +270,15 @@ void cpu_exec_step_atomic(CPUState *cpu)
 #endif
         tb_lock_reset();
     }
+
+    if (in_exclusive_region) {
+        /* We might longjump out of either the codegen or the
+         * execution, so must make sure we only end the exclusive
+         * region if we started it.
+         */
+        parallel_cpus = true;
+        end_exclusive();
+    }
 }
 
 struct tb_desc {

tcg/s390/tcg-target.inc.c

@@ -555,9 +555,6 @@ static void tcg_out_mov(TCGContext *s, TCGType type, TCGReg dst, TCGReg src)
 static const S390Opcode lli_insns[4] = {
     RI_LLILL, RI_LLILH, RI_LLIHL, RI_LLIHH
 };
-static const S390Opcode ii_insns[4] = {
-    RI_IILL, RI_IILH, RI_IIHL, RI_IIHH
-};
 
 static bool maybe_out_small_movi(TCGContext *s, TCGType type,
                                  TCGReg ret, tcg_target_long sval)
@@ -647,36 +644,19 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
         return;
     }
 
-    /* When allowed, stuff it in the constant pool.  */
+    /* Otherwise, stuff it in the constant pool.  */
-    if (!in_prologue) {
+    if (s390_facilities & FACILITY_GEN_INST_EXT) {
-        if (USE_REG_TB) {
+        tcg_out_insn(s, RIL, LGRL, ret, 0);
+        new_pool_label(s, sval, R_390_PC32DBL, s->code_ptr - 2, 2);
+    } else if (USE_REG_TB && !in_prologue) {
         tcg_out_insn(s, RXY, LG, ret, TCG_REG_TB, TCG_REG_NONE, 0);
         new_pool_label(s, sval, R_390_20, s->code_ptr - 2,
                        -(intptr_t)s->code_gen_ptr);
     } else {
-            tcg_out_insn(s, RIL, LGRL, ret, 0);
+        TCGReg base = ret ? ret : TCG_TMP0;
+        tcg_out_insn(s, RIL, LARL, base, 0);
         new_pool_label(s, sval, R_390_PC32DBL, s->code_ptr - 2, 2);
-        }
+        tcg_out_insn(s, RXY, LG, ret, base, TCG_REG_NONE, 0);
-        return;
-    }
-
-    /* What's left is for the prologue, loading GUEST_BASE, and because
-       it failed to match above, is known to be a full 64-bit quantity.
-       We could try more than this, but it probably wouldn't pay off.  */
-    if (s390_facilities & FACILITY_EXT_IMM) {
-        tcg_out_insn(s, RIL, LLILF, ret, uval);
-        tcg_out_insn(s, RIL, IIHF, ret, uval >> 32);
-    } else {
-        const S390Opcode *insns = lli_insns;
-        int i;
-
-        for (i = 0; i < 4; i++) {
-            uint16_t part = uval >> (16 * i);
-            if (part) {
-                tcg_out_insn_RI(s, insns[i], ret, part);
-                insns = ii_insns;
-            }
-        }
     }
 }
 

tcg/tcg.c

@@ -771,12 +771,32 @@ void tcg_prologue_init(TCGContext *s)
 
     /* Put the prologue at the beginning of code_gen_buffer.  */
     buf0 = s->code_gen_buffer;
+    total_size = s->code_gen_buffer_size;
     s->code_ptr = buf0;
     s->code_buf = buf0;
+    s->data_gen_ptr = NULL;
     s->code_gen_prologue = buf0;
 
+    /* Compute a high-water mark, at which we voluntarily flush the buffer
+       and start over.  The size here is arbitrary, significantly larger
+       than we expect the code generation for any one opcode to require.  */
+    s->code_gen_highwater = s->code_gen_buffer + (total_size - TCG_HIGHWATER);
+
+#ifdef TCG_TARGET_NEED_POOL_LABELS
+    s->pool_labels = NULL;
+#endif
+
     /* Generate the prologue.  */
     tcg_target_qemu_prologue(s);
+
+#ifdef TCG_TARGET_NEED_POOL_LABELS
+    /* Allow the prologue to put e.g. guest_base into a pool entry.  */
+    {
+        bool ok = tcg_out_pool_finalize(s);
+        tcg_debug_assert(ok);
+    }
+#endif
+
     buf1 = s->code_ptr;
     flush_icache_range((uintptr_t)buf0, (uintptr_t)buf1);
 
@@ -785,21 +805,36 @@ void tcg_prologue_init(TCGContext *s)
     s->code_gen_ptr = buf1;
     s->code_gen_buffer = buf1;
     s->code_buf = buf1;
-    total_size = s->code_gen_buffer_size - prologue_size;
+    total_size -= prologue_size;
     s->code_gen_buffer_size = total_size;
 
-    /* Compute a high-water mark, at which we voluntarily flush the buffer
-       and start over.  The size here is arbitrary, significantly larger
-       than we expect the code generation for any one opcode to require.  */
-    s->code_gen_highwater = s->code_gen_buffer + (total_size - TCG_HIGHWATER);
-
     tcg_register_jit(s->code_gen_buffer, total_size);
 
 #ifdef DEBUG_DISAS
     if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
         qemu_log_lock();
         qemu_log("PROLOGUE: [size=%zu]\n", prologue_size);
+        if (s->data_gen_ptr) {
+            size_t code_size = s->data_gen_ptr - buf0;
+            size_t data_size = prologue_size - code_size;
+            size_t i;
+
+            log_disas(buf0, code_size);
+
+            for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
+                if (sizeof(tcg_target_ulong) == 8) {
+                    qemu_log("0x%08" PRIxPTR ":  .quad  0x%016" PRIx64 "\n",
+                             (uintptr_t)s->data_gen_ptr + i,
+                             *(uint64_t *)(s->data_gen_ptr + i));
+                } else {
+                    qemu_log("0x%08" PRIxPTR ":  .long  0x%08x\n",
+                             (uintptr_t)s->data_gen_ptr + i,
+                             *(uint32_t *)(s->data_gen_ptr + i));
+                }
+            }
+        } else {
             log_disas(buf0, prologue_size);
+        }
         qemu_log("\n");
         qemu_log_flush();
         qemu_log_unlock();