gdbstub: Add members to identify registers to GDBFeature

These members will be used to help plugins to identify registers.
The added members in instances of GDBFeature dynamically generated by
CPUs will be filled in later changes.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20231213-gdb-v17-10-777047380591@daynix.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240227144335.1196131-15-alex.bennee@linaro.org>

diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index f766ee277a00cd0f771a6c0bf7be27fc19356a8a..a55b5e6581aec0f6ea109033d361103b338e7441 100644 (file)
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -419,9 +419,10 @@ void gdb_feature_builder_init(GDBFeatureBuilder *builder, GDBFeature *feature,
     builder->feature = feature;
     builder->xml = g_ptr_array_new();
     g_ptr_array_add(builder->xml, header);
+    builder->regs = g_ptr_array_new();
     builder->base_reg = base_reg;
     feature->xmlname = xmlname;
-    feature->num_regs = 0;
+    feature->name = name;
 }
 
 void gdb_feature_builder_append_tag(const GDBFeatureBuilder *builder,
@@ -440,10 +441,12 @@ void gdb_feature_builder_append_reg(const GDBFeatureBuilder *builder,
                                     const char *type,
                                     const char *group)
 {
-    if (builder->feature->num_regs < regnum) {
-        builder->feature->num_regs = regnum;
+    if (builder->regs->len <= regnum) {
+        g_ptr_array_set_size(builder->regs, regnum + 1);
     }
 
+    builder->regs->pdata[regnum] = (gpointer *)name;
+
     if (group) {
         gdb_feature_builder_append_tag(
             builder,
@@ -469,6 +472,9 @@ void gdb_feature_builder_end(const GDBFeatureBuilder *builder)
     }
 
     g_ptr_array_free(builder->xml, TRUE);
+
+    builder->feature->num_regs = builder->regs->len;
+    builder->feature->regs = (void *)g_ptr_array_free(builder->regs, FALSE);
 }
 
 const GDBFeature *gdb_find_static_feature(const char *xmlname)

diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index 82a8afa237f02a32e4a34b22f5189010c6dece91..da9ddfe54c5b5f4872ead4b6e65ab96af34d156a 100644 (file)
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -13,12 +13,15 @@
 typedef struct GDBFeature {
     const char *xmlname;
     const char *xml;
+    const char *name;
+    const char * const *regs;
     int num_regs;
 } GDBFeature;
 
 typedef struct GDBFeatureBuilder {
     GDBFeature *feature;
     GPtrArray *xml;
+    GPtrArray *regs;
     int base_reg;
 } GDBFeatureBuilder;
 

diff --git a/scripts/feature_to_c.py b/scripts/feature_to_c.py
index e04d6b2df7f7489117c1379c341008616aed9c84..807af0e685c30f8966744dfab55462b6d29fb7ad 100644 (file)
--- a/scripts/feature_to_c.py
+++ b/scripts/feature_to_c.py
@@ -50,7 +50,9 @@ for input in sys.argv[1:]:
         sys.stderr.write(f'unexpected start tag: {element.tag}\n')
         exit(1)
 
+    feature_name = element.attrib['name']
     regnum = 0
+    regnames = []
     regnums = []
     tags = ['feature']
     for event, element in events:
@@ -67,6 +69,7 @@ for input in sys.argv[1:]:
                 if 'regnum' in element.attrib:
                     regnum = int(element.attrib['regnum'])
 
+                regnames.append(element.attrib['name'])
                 regnums.append(regnum)
                 regnum += 1
 
@@ -85,6 +88,15 @@ for input in sys.argv[1:]:
     writeliteral(8, bytes(os.path.basename(input), 'utf-8'))
     sys.stdout.write(',\n')
     writeliteral(8, read)
-    sys.stdout.write(f',\n        {num_regs},\n    }},\n')
+    sys.stdout.write(',\n')
+    writeliteral(8, bytes(feature_name, 'utf-8'))
+    sys.stdout.write(',\n        (const char * const []) {\n')
+
+    for index, regname in enumerate(regnames):
+        sys.stdout.write(f'            [{regnums[index] - base_reg}] =\n')
+        writeliteral(16, bytes(regname, 'utf-8'))
+        sys.stdout.write(',\n')
+
+    sys.stdout.write(f'        }},\n        {num_regs},\n    }},\n')
 
 sys.stdout.write('    { NULL }\n};\n')

diff --git a/target/riscv/gdbstub.c b/target/riscv/gdbstub.c
index 546e8692d170926755f19542e4537a17d7b60ed2..be7a02cd903c333d3daae7a15b27150a281f3ddd 100644 (file)
--- a/target/riscv/gdbstub.c
+++ b/target/riscv/gdbstub.c
@@ -266,11 +266,9 @@ static GDBFeature *riscv_gen_dynamic_csr_feature(CPUState *cs, int base_reg)
         }
         predicate = csr_ops[i].predicate;
         if (predicate && (predicate(env, i) == RISCV_EXCP_NONE)) {
-            g_autofree char *dynamic_name = NULL;
             name = csr_ops[i].name;
             if (!name) {
-                dynamic_name = g_strdup_printf("csr%03x", i);
-                name = dynamic_name;
+                name = g_strdup_printf("csr%03x", i);
             }
 
             gdb_feature_builder_append_reg(&builder, name, bitsize, i,