[v3,04/21] target/xtensa: add geometry to xtensa_get_regfile_by_name

Commit Message

Max Filippov July 8, 2020, 10:20 p.m. UTC

Register file name may not uniquely identify a register file in the set
of configurations. E.g. floating point registers may have different size
in different configurations. Use register file geometry as additional
identifier.

Signed-off-by: Max Filippov <[e-mail]>
---
 target/xtensa/cpu.h       |  2 +-
 target/xtensa/helper.c    |  4 +++-
 target/xtensa/translate.c | 35 +++++++++++++++++++++++++++--------
 3 files changed, 31 insertions(+), 10 deletions(-)

Patch

diff --git a/target/xtensa/cpu.h b/target/xtensa/cpu.h
index 0c96181212a5..0409aa6189cf 100644
--- a/target/xtensa/cpu.h
+++ b/target/xtensa/cpu.h
@@ -598,7 +598,7 @@  void xtensa_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
 
 void xtensa_collect_sr_names(const XtensaConfig *config);
 void xtensa_translate_init(void);
-void **xtensa_get_regfile_by_name(const char *name);
+void **xtensa_get_regfile_by_name(const char *name, int entries, int bits);
 void xtensa_breakpoint_handler(CPUState *cs);
 void xtensa_register_core(XtensaConfigList *node);
 void xtensa_sim_open_console(Chardev *chr);
diff --git a/target/xtensa/helper.c b/target/xtensa/helper.c
index 7073381f03b2..05e2b7f70a1e 100644
--- a/target/xtensa/helper.c
+++ b/target/xtensa/helper.c
@@ -133,8 +133,10 @@  static void init_libisa(XtensaConfig *config)
     config->regfile = g_new(void **, regfiles);
     for (i = 0; i < regfiles; ++i) {
         const char *name = xtensa_regfile_name(config->isa, i);
+        int entries = xtensa_regfile_num_entries(config->isa, i);
+        int bits = xtensa_regfile_num_bits(config->isa, i);
 
-        config->regfile[i] = xtensa_get_regfile_by_name(name);
+        config->regfile[i] = xtensa_get_regfile_by_name(name, entries, bits);
 #ifdef DEBUG
         if (config->regfile[i] == NULL) {
             fprintf(stderr, "regfile '%s' not found for %s\n",
diff --git a/target/xtensa/translate.c b/target/xtensa/translate.c
index 03d796d7a1ed..9838bf6b3ec5 100644
--- a/target/xtensa/translate.c
+++ b/target/xtensa/translate.c
@@ -227,24 +227,43 @@  void xtensa_translate_init(void)
                                "exclusive_val");
 }
 
-void **xtensa_get_regfile_by_name(const char *name)
+void **xtensa_get_regfile_by_name(const char *name, int entries, int bits)
 {
+    char *geometry_name;
+    void **res;
+
     if (xtensa_regfile_table == NULL) {
         xtensa_regfile_table = g_hash_table_new(g_str_hash, g_str_equal);
+        /*
+         * AR is special. Xtensa translator uses it as a current register
+         * window, but configuration overlays represent it as a complete
+         * physical register file.
+         */
         g_hash_table_insert(xtensa_regfile_table,
-                            (void *)"AR", (void *)cpu_R);
+                            (void *)"AR 16x32", (void *)cpu_R);
         g_hash_table_insert(xtensa_regfile_table,
-                            (void *)"MR", (void *)cpu_MR);
+                            (void *)"AR 32x32", (void *)cpu_R);
         g_hash_table_insert(xtensa_regfile_table,
-                            (void *)"FR", (void *)cpu_FR);
+                            (void *)"AR 64x32", (void *)cpu_R);
+
         g_hash_table_insert(xtensa_regfile_table,
-                            (void *)"BR", (void *)cpu_BR);
+                            (void *)"MR 4x32", (void *)cpu_MR);
+
         g_hash_table_insert(xtensa_regfile_table,
-                            (void *)"BR4", (void *)cpu_BR4);
+                            (void *)"FR 16x32", (void *)cpu_FR);
+
         g_hash_table_insert(xtensa_regfile_table,
-                            (void *)"BR8", (void *)cpu_BR8);
+                            (void *)"BR 16x1", (void *)cpu_BR);
+        g_hash_table_insert(xtensa_regfile_table,
+                            (void *)"BR4 4x4", (void *)cpu_BR4);
+        g_hash_table_insert(xtensa_regfile_table,
+                            (void *)"BR8 2x8", (void *)cpu_BR8);
     }
-    return (void **)g_hash_table_lookup(xtensa_regfile_table, (void *)name);
+
+    geometry_name = g_strdup_printf("%s %dx%d", name, entries, bits);
+    res = (void **)g_hash_table_lookup(xtensa_regfile_table, geometry_name);
+    g_free(geometry_name);
+    return res;
 }
 
 static inline bool option_enabled(DisasContext *dc, int opt)