tcg: Add insn_start_words to TCGContext

This will enable replacement of TARGET_INSN_START_WORDS in tcg.c.
Split out "tcg/insn-start-words.h" and use it in target/.

Reviewed-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

4 files changed, 26 insertions, 14 deletions

diff --git a/include/tcg/insn-start-words.h b/include/tcg/insn-start-words.h
new file mode 100644
index 0000000..50c18bd
--- /dev/null
+++ b/include/tcg/insn-start-words.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Define TARGET_INSN_START_WORDS
+ * Copyright (c) 2008 Fabrice Bellard
+ */
+
+#ifndef TARGET_INSN_START_WORDS
+
+#include "cpu.h"
+
+#ifndef TARGET_INSN_START_EXTRA_WORDS
+# define TARGET_INSN_START_WORDS 1
+#else
+# define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
+#endif
+
+#endif /* TARGET_INSN_START_WORDS */
diff --git a/include/tcg/tcg-op.h b/include/tcg/tcg-op.h
index 47f1dce..d63683c 100644
--- a/include/tcg/tcg-op.h
+++ b/include/tcg/tcg-op.h
@@ -22,20 +22,20 @@
 # error
 #endif
 
-#if TARGET_INSN_START_WORDS == 1
+#ifndef TARGET_INSN_START_EXTRA_WORDS
 static inline void tcg_gen_insn_start(target_ulong pc)
 {
     TCGOp *op = tcg_emit_op(INDEX_op_insn_start, 64 / TCG_TARGET_REG_BITS);
     tcg_set_insn_start_param(op, 0, pc);
 }
-#elif TARGET_INSN_START_WORDS == 2
+#elif TARGET_INSN_START_EXTRA_WORDS == 1
 static inline void tcg_gen_insn_start(target_ulong pc, target_ulong a1)
 {
     TCGOp *op = tcg_emit_op(INDEX_op_insn_start, 2 * 64 / TCG_TARGET_REG_BITS);
     tcg_set_insn_start_param(op, 0, pc);
     tcg_set_insn_start_param(op, 1, a1);
 }
-#elif TARGET_INSN_START_WORDS == 3
+#elif TARGET_INSN_START_EXTRA_WORDS == 2
 static inline void tcg_gen_insn_start(target_ulong pc, target_ulong a1,
                                       target_ulong a2)
 {
@@ -45,7 +45,7 @@ static inline void tcg_gen_insn_start(target_ulong pc, target_ulong a1,
     tcg_set_insn_start_param(op, 2, a2);
 }
 #else
-# error "Unhandled number of operands to insn_start"
+#error Unhandled TARGET_INSN_START_EXTRA_WORDS value
 #endif
 
 #if TARGET_LONG_BITS == 32
diff --git a/include/tcg/tcg-opc.h b/include/tcg/tcg-opc.h
index 21594c1..acfa5ba 100644
--- a/include/tcg/tcg-opc.h
+++ b/include/tcg/tcg-opc.h
@@ -188,9 +188,9 @@ DEF(mulsh_i64, 1, 2, 0, IMPL64 | IMPL(TCG_TARGET_HAS_mulsh_i64))
 
 #define DATA64_ARGS  (TCG_TARGET_REG_BITS == 64 ? 1 : 2)
 
-/* QEMU specific */
-DEF(insn_start, 0, 0, DATA64_ARGS * TARGET_INSN_START_WORDS,
-    TCG_OPF_NOT_PRESENT)
+/* There are tcg_ctx->insn_start_words here, not just one. */
+DEF(insn_start, 0, 0, DATA64_ARGS, TCG_OPF_NOT_PRESENT)
+
 DEF(exit_tb, 0, 0, 1, TCG_OPF_BB_EXIT | TCG_OPF_BB_END)
 DEF(goto_tb, 0, 0, 1, TCG_OPF_BB_EXIT | TCG_OPF_BB_END)
 DEF(goto_ptr, 0, 1, 0, TCG_OPF_BB_EXIT | TCG_OPF_BB_END)
diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index 7c1bbba..813c733 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -173,12 +173,6 @@ typedef uint64_t TCGRegSet;
 #define TCG_TARGET_HAS_v256             0
 #endif
 
-#ifndef TARGET_INSN_START_EXTRA_WORDS
-# define TARGET_INSN_START_WORDS 1
-#else
-# define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
-#endif
-
 typedef enum TCGOpcode {
 #define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
 #include "tcg/tcg-opc.h"
@@ -526,6 +520,7 @@ struct TCGContext {
     uint8_t page_bits;
     uint8_t tlb_dyn_max_bits;
 #endif
+    uint8_t insn_start_words;
 
     TCGRegSet reserved_regs;
     intptr_t current_frame_offset;
@@ -597,7 +592,7 @@ struct TCGContext {
     TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS];
 
     uint16_t gen_insn_end_off[TCG_MAX_INSNS];
-    uint64_t gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];
+    uint64_t *gen_insn_data;
 
     /* Exit to translator on overflow. */
     sigjmp_buf jmp_trans;