[PATCH v9 17/23] gdbstub: Expose functions to read registers

[Akihiko Odaki]

gdb_find_feature() and gdb_find_feature_register() find registers.
gdb_read_register() actually reads registers.

Signed-off-by: Akihiko Odaki <akihiko.od...@daynix.com>
---
 include/exec/gdbstub.h |  5 +++++
 gdbstub/gdbstub.c      | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index b2b2675f6f..d73abfbd44 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -71,6 +71,11 @@ void gdb_feature_builder_end(const GDBFeatureBuilder 
*builder);
 
 const GDBFeature *gdb_find_static_feature(const char *xmlname);
 
+int gdb_find_feature(CPUState *cpu, const char *name);
+int gdb_find_feature_register(CPUState *cpu, int feature, const char *name);
+
+int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
+
 void gdb_set_stop_cpu(CPUState *cpu);
 
 /* in gdbstub-xml.c, generated by scripts/feature_to_c.py */
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index 987af2298c..a3fc65ec86 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -484,7 +484,36 @@ const GDBFeature *gdb_find_static_feature(const char 
*xmlname)
     g_assert_not_reached();
 }
 
-static int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
+int gdb_find_feature(CPUState *cpu, const char *name)
+{
+    GDBRegisterState *r;
+
+    for (guint i = 0; i < cpu->gdb_regs->len; i++) {
+        r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
+        if (!strcmp(name, r->feature->name)) {
+            return i;
+        }
+    }
+
+    return -1;
+}
+
+int gdb_find_feature_register(CPUState *cpu, int feature, const char *name)
+{
+    GDBRegisterState *r;
+
+    r = &g_array_index(cpu->gdb_regs, GDBRegisterState, feature);
+
+    for (int i = 0; i < r->feature->num_regs; i++) {
+        if (r->feature->regs[i] && !strcmp(name, r->feature->regs[i])) {
+            return r->base_reg + i;
+        }
+    }
+
+    return -1;
+}
+
+int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);
     GDBRegisterState *r;
-- 
2.42.0