[RFC PATCH v4 08/29] Hexagon (target/hexagon) GDB Stub

[Taylor Simpson <tsimpson@quicinc.com>]

GDB register read and write routines

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/hexagon/internal.h |  3 +++
 target/hexagon/cpu.c      |  2 ++
 target/hexagon/gdbstub.c  | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+)
 create mode 100644 target/hexagon/gdbstub.c

diff --git a/target/hexagon/internal.h b/target/hexagon/internal.h
index 327bad9..961318a 100644
--- a/target/hexagon/internal.h
+++ b/target/hexagon/internal.h
@@ -29,6 +29,9 @@
         } \
     } while (0)
 
+extern int hexagon_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
+extern int hexagon_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
+
 extern void hexagon_debug(CPUHexagonState *env);
 
 extern const char * const hexagon_regnames[TOTAL_PER_THREAD_REGS];
diff --git a/target/hexagon/cpu.c b/target/hexagon/cpu.c
index 5e0da3f..32aa982 100644
--- a/target/hexagon/cpu.c
+++ b/target/hexagon/cpu.c
@@ -280,6 +280,8 @@ static void hexagon_cpu_class_init(ObjectClass *c, void *data)
     cc->dump_state = hexagon_dump_state;
     cc->set_pc = hexagon_cpu_set_pc;
     cc->synchronize_from_tb = hexagon_cpu_synchronize_from_tb;
+    cc->gdb_read_register = hexagon_gdb_read_register;
+    cc->gdb_write_register = hexagon_gdb_write_register;
     cc->gdb_num_core_regs = TOTAL_PER_THREAD_REGS;
     cc->gdb_stop_before_watchpoint = true;
     cc->disas_set_info = hexagon_cpu_disas_set_info;
diff --git a/target/hexagon/gdbstub.c b/target/hexagon/gdbstub.c
new file mode 100644
index 0000000..e8c10b2
--- /dev/null
+++ b/target/hexagon/gdbstub.c
@@ -0,0 +1,47 @@
+/*
+ *  Copyright(c) 2019-2020 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "exec/gdbstub.h"
+#include "cpu.h"
+#include "internal.h"
+
+int hexagon_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
+{
+    HexagonCPU *cpu = HEXAGON_CPU(cs);
+    CPUHexagonState *env = &cpu->env;
+
+    if (n < TOTAL_PER_THREAD_REGS) {
+        return gdb_get_regl(mem_buf, env->gpr[n]);
+    }
+
+    g_assert_not_reached();
+}
+
+int hexagon_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    HexagonCPU *cpu = HEXAGON_CPU(cs);
+    CPUHexagonState *env = &cpu->env;
+
+    if (n < TOTAL_PER_THREAD_REGS) {
+        env->gpr[n] = ldtul_p(mem_buf);
+        return sizeof(target_ulong);
+    }
+
+    g_assert_not_reached();
+}
-- 
2.7.4