[PATCH v1 2/3] target/riscv: Extend isa_ext_data for single letter extensions

[Mayuresh Chitale <mchitale@ventanamicro.com>]

Currently the ISA string for a CPU is generated from two different
arrays, one for single letter extensions and another for multi letter
extensions. Add all the single letter extensions to the isa_ext_data
array and use it for generating the ISA string. Also drop 'P' and 'Q'
extensions from the list of single letter extensions as those are not
supported yet.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 target/riscv/cpu.c | 41 +++++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index e6d9c706bb..35320a8547 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -41,8 +41,6 @@
                              (QEMU_VERSION_MICRO))
 #define RISCV_CPU_MIMPID    RISCV_CPU_MARCHID
 
-static const char riscv_single_letter_exts[] = "IEMAFDQCPVH";
-
 struct isa_ext_data {
     const char *name;
     bool multi_letter;
@@ -71,6 +69,13 @@ struct isa_ext_data {
  *    extensions by an underscore.
  */
 static const struct isa_ext_data isa_edata_arr[] = {
+    ISA_EXT_DATA_ENTRY(i, false, PRIV_VERSION_1_10_0, ext_i),
+    ISA_EXT_DATA_ENTRY(e, false, PRIV_VERSION_1_10_0, ext_e),
+    ISA_EXT_DATA_ENTRY(m, false, PRIV_VERSION_1_10_0, ext_m),
+    ISA_EXT_DATA_ENTRY(a, false, PRIV_VERSION_1_10_0, ext_a),
+    ISA_EXT_DATA_ENTRY(f, false, PRIV_VERSION_1_10_0, ext_f),
+    ISA_EXT_DATA_ENTRY(d, false, PRIV_VERSION_1_10_0, ext_d),
+    ISA_EXT_DATA_ENTRY(c, false, PRIV_VERSION_1_10_0, ext_c),
     ISA_EXT_DATA_ENTRY(h, false, PRIV_VERSION_1_12_0, ext_h),
     ISA_EXT_DATA_ENTRY(v, false, PRIV_VERSION_1_12_0, ext_v),
     ISA_EXT_DATA_ENTRY(zicsr, true, PRIV_VERSION_1_10_0, ext_icsr),
@@ -1182,16 +1187,23 @@ static void riscv_cpu_class_init(ObjectClass *c, void *data)
     device_class_set_props(dc, riscv_cpu_properties);
 }
 
-static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
+static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str)
 {
     char *old = *isa_str;
     char *new = *isa_str;
     int i;
 
     for (i = 0; i < ARRAY_SIZE(isa_edata_arr); i++) {
-        if (isa_edata_arr[i].multi_letter &&
-            isa_ext_is_enabled(cpu, &isa_edata_arr[i])) {
-            new = g_strconcat(old, "_", isa_edata_arr[i].name, NULL);
+        if (isa_ext_is_enabled(cpu, &isa_edata_arr[i])) {
+            if (isa_edata_arr[i].multi_letter) {
+                if (cpu->cfg.short_isa_string) {
+                    continue;
+                }
+                new = g_strconcat(old, "_", isa_edata_arr[i].name, NULL);
+            } else {
+                new = g_strconcat(old, isa_edata_arr[i].name, NULL);
+            }
+
             g_free(old);
             old = new;
         }
@@ -1202,19 +1214,12 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
 
 char *riscv_isa_string(RISCVCPU *cpu)
 {
-    int i;
-    const size_t maxlen = sizeof("rv128") + sizeof(riscv_single_letter_exts);
+    const size_t maxlen = sizeof("rv128");
     char *isa_str = g_new(char, maxlen);
-    char *p = isa_str + snprintf(isa_str, maxlen, "rv%d", TARGET_LONG_BITS);
-    for (i = 0; i < sizeof(riscv_single_letter_exts) - 1; i++) {
-        if (cpu->env.misa_ext & RV(riscv_single_letter_exts[i])) {
-            *p++ = qemu_tolower(riscv_single_letter_exts[i]);
-        }
-    }
-    *p = '\0';
-    if (!cpu->cfg.short_isa_string) {
-        riscv_isa_string_ext(cpu, &isa_str, maxlen);
-    }
+
+    snprintf(isa_str, maxlen, "rv%d", TARGET_LONG_BITS);
+    riscv_isa_string_ext(cpu, &isa_str);
+
     return isa_str;
 }
 
-- 
2.34.1