[Qemu-devel] [PATCH v4 30/54] translator: add translator_ld{ub, sw, uw, l, q}

["Alex Bennée" <alex.bennee@linaro.org>]

From: "Emilio G. Cota" <cota@braap.org>

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
[AJB: directly plumb into softmmu/user helpers]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v4
  - don't use the cpu_ldst helpers, plumb directly into the lower
  level
  - mark the CODE_ACCESS/SOFTMMU_CODE_ACCESS as deprecated
---
 include/exec/cpu_ldst.h   | 11 ++++++++
 include/exec/translator.h | 58 ++++++++++++++++++++++++++++++++++++++-
 include/qemu/bswap.h      |  5 ++++
 tcg/tcg.h                 |  2 ++
 4 files changed, 75 insertions(+), 1 deletion(-)

diff --git a/include/exec/cpu_ldst.h b/include/exec/cpu_ldst.h
index 9151fdb042c..fd499f7e2ff 100644
--- a/include/exec/cpu_ldst.h
+++ b/include/exec/cpu_ldst.h
@@ -129,6 +129,11 @@ static inline void clear_helper_retaddr(void)
 #include "exec/cpu_ldst_useronly_template.h"
 #undef MEMSUFFIX
 
+/*
+ * Code access is deprecated in favour of translator_ld* functions
+ * (see translator.h). However there are still users that need to
+ * converted so for now these stay.
+ */
 #define MEMSUFFIX _code
 #define CODE_ACCESS
 #define DATA_SIZE 1
@@ -427,6 +432,12 @@ static inline CPUTLBEntry *tlb_entry(CPUArchState *env, uintptr_t mmu_idx,
 #undef CPU_MMU_INDEX
 #undef MEMSUFFIX
 
+/*
+ * Code access is deprecated in favour of translator_ld* functions
+ * (see translator.h). However there are still users that need to
+ * converted so for now these stay.
+ */
+
 #define CPU_MMU_INDEX (cpu_mmu_index(env, true))
 #define MEMSUFFIX _code
 #define SOFTMMU_CODE_ACCESS
diff --git a/include/exec/translator.h b/include/exec/translator.h
index 180c51d5092..30b1a594fc1 100644
--- a/include/exec/translator.h
+++ b/include/exec/translator.h
@@ -19,7 +19,10 @@
  */
 
 
+#include "qemu/bswap.h"
 #include "exec/exec-all.h"
+#include "exec/cpu_ldst.h"
+#include "exec/plugin-gen.h"
 #include "tcg/tcg.h"
 
 
@@ -142,4 +145,57 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
 
 void translator_loop_temp_check(DisasContextBase *db);
 
-#endif /* EXEC__TRANSLATOR_H */
+/*
+ * Translator Load Functions
+ *
+ * These are intended to replace the old cpu_ld*_code functions and
+ * are mandatory for front-ends that have been migrated to the common
+ * translator_loop. These functions are only intended to be called
+ * from the translation stage and should not be called from helper
+ * functions. Those functions should be converted to encode the
+ * relevant at translation time.
+ */
+
+#ifdef CONFIG_USER_ONLY
+
+#define DO_LOAD(type, name, shift)               \
+    set_helper_retaddr(1);                       \
+    ret = name ## _p(g2h(pc));                   \
+    clear_helper_retaddr();
+
+#else
+
+#define DO_LOAD(type, name, shift)                   \
+    int mmu_idx = cpu_mmu_index(env, true);          \
+    TCGMemOpIdx oi = make_memop_idx(shift, mmu_idx); \
+    ret = helper_ret_ ## name ## _cmmu(env, pc, oi, 0);
+
+#endif
+
+#define GEN_TRANSLATOR_LD(fullname, name, type, shift, swap_fn)         \
+    static inline type                                                  \
+    fullname ## _swap(CPUArchState *env, abi_ptr pc, bool do_swap)      \
+    {                                                                   \
+        type ret;                                                       \
+        DO_LOAD(type, name, shift)                                      \
+                                                                        \
+        if (do_swap) {                                                  \
+            ret = swap_fn(ret);                                         \
+        }                                                               \
+        plugin_insn_append(&ret, sizeof(ret));                          \
+        return ret;                                                     \
+    }                                                                   \
+                                                                        \
+    static inline type fullname(CPUArchState *env, abi_ptr pc)          \
+    {                                                                   \
+        return fullname ## _swap(env, pc, false);                       \
+    }
+
+GEN_TRANSLATOR_LD(translator_ldub, ldb, uint8_t, 1, /* no swap needed */)
+GEN_TRANSLATOR_LD(translator_ldsw, lduw, int16_t, 2, bswap16)
+GEN_TRANSLATOR_LD(translator_lduw, lduw, uint16_t, 2, bswap16)
+GEN_TRANSLATOR_LD(translator_ldl, ldl, uint32_t, 3, bswap32)
+GEN_TRANSLATOR_LD(translator_ldq, ldq, uint64_t, 4, bswap64)
+#undef GEN_TRANSLATOR_LD
+
+#endif  /* EXEC__TRANSLATOR_H */
diff --git a/include/qemu/bswap.h b/include/qemu/bswap.h
index 2a9f3fe783e..4f707278740 100644
--- a/include/qemu/bswap.h
+++ b/include/qemu/bswap.h
@@ -306,6 +306,11 @@ static inline int ldub_p(const void *ptr)
     return *(uint8_t *)ptr;
 }
 
+static inline int ldb_p(const void *ptr)
+{
+    return ldub_p(ptr);
+}
+
 static inline int ldsb_p(const void *ptr)
 {
     return *(int8_t *)ptr;
diff --git a/tcg/tcg.h b/tcg/tcg.h
index 93f52f4ca93..c918fdd87c4 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -1404,6 +1404,7 @@ uint64_t helper_be_ldq_cmmu(CPUArchState *env, target_ulong addr,
 # define helper_ret_stl_mmu   helper_be_stl_mmu
 # define helper_ret_stq_mmu   helper_be_stq_mmu
 # define helper_ret_ldw_cmmu  helper_be_ldw_cmmu
+# define helper_ret_lduw_cmmu helper_be_ldw_cmmu
 # define helper_ret_ldl_cmmu  helper_be_ldl_cmmu
 # define helper_ret_ldq_cmmu  helper_be_ldq_cmmu
 #else
@@ -1417,6 +1418,7 @@ uint64_t helper_be_ldq_cmmu(CPUArchState *env, target_ulong addr,
 # define helper_ret_stl_mmu   helper_le_stl_mmu
 # define helper_ret_stq_mmu   helper_le_stq_mmu
 # define helper_ret_ldw_cmmu  helper_le_ldw_cmmu
+# define helper_ret_lduw_cmmu helper_le_ldw_cmmu
 # define helper_ret_ldl_cmmu  helper_le_ldl_cmmu
 # define helper_ret_ldq_cmmu  helper_le_ldq_cmmu
 #endif
-- 
2.20.1