target: [tcg] Use a generic enum for DISAS_ values

Used later. An enum makes expected values explicit and
bounds the value space of switches.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <150002049746.22386.2316077281615710615.stgit@frigg.lan>
Signed-off-by: Richard Henderson <rth@twiddle.net>

include/exec/exec-all.h

@@ -35,36 +35,6 @@ typedef abi_ulong tb_page_addr_t;
 typedef ram_addr_t tb_page_addr_t;
 #endif
 
-/* DisasContext is_jmp field values
- *
- * is_jmp starts as DISAS_NEXT. The translator will keep processing
- * instructions until an exit condition is reached. If we reach the
- * exit condition and is_jmp is still DISAS_NEXT (because of some
- * other condition) we simply "jump" to the next address.
- * The remaining exit cases are:
- *
- *   DISAS_JUMP    - Only the PC was modified dynamically (e.g computed)
- *   DISAS_TB_JUMP - Only the PC was modified statically (e.g. branch)
- *
- * In these cases as long as the PC is updated we can chain to the
- * next TB either by exiting the loop or looking up the next TB via
- * the loookup helper.
- *
- *   DISAS_UPDATE  - CPU State was modified dynamically
- *
- * This covers any other CPU state which necessities us exiting the
- * TCG code to the main run-loop. Typically this includes anything
- * that might change the interrupt state.
- *
- * Individual translators may define additional exit cases to deal
- * with per-target special conditions.
- */
-#define DISAS_NEXT    0 /* next instruction can be analyzed */
-#define DISAS_JUMP    1 /* only pc was modified dynamically */
-#define DISAS_TB_JUMP 2 /* only pc was modified statically */
-#define DISAS_UPDATE  3 /* cpu state was modified dynamically */
-#define DISAS_NORETURN 4 /* the tb has already been exited */
-
 #include "qemu/log.h"
 
 void gen_intermediate_code(CPUState *cpu, struct TranslationBlock *tb);

include/exec/translator.h

@@ -0,0 +1,40 @@
+/*
+ * Generic intermediate code generation.
+ *
+ * Copyright (C) 2016-2017 Lluís Vilanova <vilanova@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef EXEC__TRANSLATOR_H
+#define EXEC__TRANSLATOR_H
+
+/**
+ * DisasJumpType:
+ * @DISAS_NEXT: Next instruction in program order.
+ * @DISAS_TOO_MANY: Too many instructions translated.
+ * @DISAS_NORETURN: Following code is dead.
+ * @DISAS_TARGET_*: Start of target-specific conditions.
+ *
+ * What instruction to disassemble next.
+ */
+typedef enum DisasJumpType {
+    DISAS_NEXT,
+    DISAS_TOO_MANY,
+    DISAS_NORETURN,
+    DISAS_TARGET_0,
+    DISAS_TARGET_1,
+    DISAS_TARGET_2,
+    DISAS_TARGET_3,
+    DISAS_TARGET_4,
+    DISAS_TARGET_5,
+    DISAS_TARGET_6,
+    DISAS_TARGET_7,
+    DISAS_TARGET_8,
+    DISAS_TARGET_9,
+    DISAS_TARGET_10,
+    DISAS_TARGET_11,
+} DisasJumpType;
+
+#endif  /* EXEC__TRANSLATOR_H */

target/arm/translate.c

@@ -4174,7 +4174,7 @@ static void gen_goto_tb(DisasContext *s, int n, target_ulong dest)
         gen_set_pc_im(s, dest);
         gen_goto_ptr();
     }
-    s->is_jmp = DISAS_TB_JUMP;
+    s->is_jmp = DISAS_NORETURN;
 }
 
 static inline void gen_jmp (DisasContext *s, uint32_t dest)

target/arm/translate.h

@@ -1,6 +1,9 @@
 #ifndef TARGET_ARM_TRANSLATE_H
 #define TARGET_ARM_TRANSLATE_H
 
+#include "exec/translator.h"
+
+
 /* internal defines */
 typedef struct DisasContext {
     target_ulong pc;
@@ -119,29 +122,31 @@ static void disas_set_insn_syndrome(DisasContext *s, uint32_t syn)
     s->insn_start_idx = 0;
 }
 
-/* target-specific extra values for is_jmp */
+/* is_jmp field values */
+#define DISAS_JUMP      DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE    DISAS_TARGET_1 /* cpu state was modified dynamically */
 /* These instructions trap after executing, so the A32/T32 decoder must
  * defer them until after the conditional execution state has been updated.
  * WFI also needs special handling when single-stepping.
  */
-#define DISAS_WFI 5
-#define DISAS_SWI 6
+#define DISAS_WFI       DISAS_TARGET_2
+#define DISAS_SWI       DISAS_TARGET_3
 /* WFE */
-#define DISAS_WFE 7
-#define DISAS_HVC 8
-#define DISAS_SMC 9
-#define DISAS_YIELD 10
+#define DISAS_WFE       DISAS_TARGET_4
+#define DISAS_HVC       DISAS_TARGET_5
+#define DISAS_SMC       DISAS_TARGET_6
+#define DISAS_YIELD     DISAS_TARGET_7
 /* M profile branch which might be an exception return (and so needs
  * custom end-of-TB code)
  */
-#define DISAS_BX_EXCRET 11
+#define DISAS_BX_EXCRET DISAS_TARGET_8
 /* For instructions which want an immediate exit to the main loop,
  * as opposed to attempting to use lookup_and_goto_ptr. Unlike
  * DISAS_UPDATE this doesn't write the PC on exiting the translation
  * loop so you need to ensure something (gen_a64_set_pc_im or runtime
  * helper) has done so before we reach return from cpu_tb_exec.
  */
-#define DISAS_EXIT 12
+#define DISAS_EXIT      DISAS_TARGET_9
 
 #ifdef TARGET_AARCH64
 void a64_translate_init(void);

target/cris/translate.c

@@ -31,6 +31,7 @@
 #include "exec/helper-proto.h"
 #include "mmu.h"
 #include "exec/cpu_ldst.h"
+#include "exec/translator.h"
 #include "crisv32-decode.h"
 
 #include "exec/helper-gen.h"
@@ -50,7 +51,11 @@
 #define BUG() (gen_BUG(dc, __FILE__, __LINE__))
 #define BUG_ON(x) ({if (x) BUG();})
 
-#define DISAS_SWI 5
+/* is_jmp field values */
+#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */
+#define DISAS_SWI     DISAS_TARGET_3
 
 /* Used by the decoder.  */
 #define EXTRACT_FIELD(src, start, end) \

target/i386/translate.c

@@ -24,6 +24,7 @@
 #include "exec/exec-all.h"
 #include "tcg-op.h"
 #include "exec/cpu_ldst.h"
+#include "exec/translator.h"
 
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
@@ -31,8 +32,6 @@
 #include "trace-tcg.h"
 #include "exec/log.h"
 
-#define DISAS_TOO_MANY 5
-
 #define PREFIX_REPZ   0x01
 #define PREFIX_REPNZ  0x02
 #define PREFIX_LOCK   0x04

target/lm32/translate.c

@@ -22,6 +22,7 @@
 #include "disas/disas.h"
 #include "exec/helper-proto.h"
 #include "exec/exec-all.h"
+#include "exec/translator.h"
 #include "tcg-op.h"
 
 #include "exec/cpu_ldst.h"
@@ -47,6 +48,11 @@
 
 #define MEM_INDEX 0
 
+/* is_jmp field values */
+#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */
+
 static TCGv_env cpu_env;
 static TCGv cpu_R[32];
 static TCGv cpu_pc;

target/m68k/translate.c

@@ -25,6 +25,7 @@
 #include "tcg-op.h"
 #include "qemu/log.h"
 #include "exec/cpu_ldst.h"
+#include "exec/translator.h"
 
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
@@ -173,7 +174,11 @@ static void do_writebacks(DisasContext *s)
     }
 }
 
-#define DISAS_JUMP_NEXT 4
+/* is_jmp field values */
+#define DISAS_JUMP      DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE    DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP   DISAS_TARGET_2 /* only pc was modified statically */
+#define DISAS_JUMP_NEXT DISAS_TARGET_3
 
 #if defined(CONFIG_USER_ONLY)
 #define IS_USER(s) 1

target/microblaze/translate.c

@@ -27,6 +27,7 @@
 #include "microblaze-decode.h"
 #include "exec/cpu_ldst.h"
 #include "exec/helper-gen.h"
+#include "exec/translator.h"
 
 #include "trace-tcg.h"
 #include "exec/log.h"
@@ -46,6 +47,11 @@
 #define EXTRACT_FIELD(src, start, end) \
             (((src) >> start) & ((1 << (end - start + 1)) - 1))
 
+/* is_jmp field values */
+#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */
+
 static TCGv env_debug;
 static TCGv_env cpu_env;
 static TCGv cpu_R[32];

target/nios2/translate.c

@@ -29,6 +29,12 @@
 #include "exec/helper-gen.h"
 #include "exec/log.h"
 #include "exec/cpu_ldst.h"
+#include "exec/translator.h"
+
+/* is_jmp field values */
+#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */
 
 #define INSTRUCTION_FLG(func, flags) { (func), (flags) }
 #define INSTRUCTION(func)                  \

target/openrisc/translate.c

@@ -27,6 +27,7 @@
 #include "qemu/log.h"
 #include "qemu/bitops.h"
 #include "exec/cpu_ldst.h"
+#include "exec/translator.h"
 
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
@@ -37,6 +38,11 @@
 #define LOG_DIS(str, ...) \
     qemu_log_mask(CPU_LOG_TB_IN_ASM, "%08x: " str, dc->pc, ## __VA_ARGS__)
 
+/* is_jmp field values */
+#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */
+
 typedef struct DisasContext {
     TranslationBlock *tb;
     target_ulong pc;

target/s390x/translate.c

@@ -77,7 +77,8 @@ typedef struct {
     } u;
 } DisasCompare;
 
-#define DISAS_EXCP 4
+/* is_jmp field values */
+#define DISAS_EXCP DISAS_TARGET_0
 
 #ifdef DEBUG_INLINE_BRANCHES
 static uint64_t inline_branch_hit[CC_OP_MAX];

target/unicore32/translate.c

@@ -16,6 +16,7 @@
 #include "tcg-op.h"
 #include "qemu/log.h"
 #include "exec/cpu_ldst.h"
+#include "exec/translator.h"
 
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
@@ -45,9 +46,13 @@ typedef struct DisasContext {
 #define IS_USER(s)      1
 #endif
 
+/* is_jmp field values */
+#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
+#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
+#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */
 /* These instructions trap after executing, so defer them until after the
    conditional executions state has been updated.  */
-#define DISAS_SYSCALL 5
+#define DISAS_SYSCALL DISAS_TARGET_3
 
 static TCGv_env cpu_env;
 static TCGv_i32 cpu_R[32];

target/xtensa/translate.c

@@ -38,6 +38,7 @@
 #include "sysemu/sysemu.h"
 #include "exec/cpu_ldst.h"
 #include "exec/semihost.h"
+#include "exec/translator.h"
 
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
@@ -46,6 +47,9 @@
 #include "exec/log.h"
 
 
+/* is_jmp field values */
+#define DISAS_UPDATE  DISAS_TARGET_0 /* cpu state was modified dynamically */
+
 typedef struct DisasContext {
     const XtensaConfig *config;
     TranslationBlock *tb;