4 files changed, 89 insertions, 0 deletions
diff --git a/target-openrisc/Makefile.objs b/target-openrisc/Makefile.objs
index 44dc5399df..397d01650e 100644
--- a/target-openrisc/Makefile.objs
+++ b/target-openrisc/Makefile.objs
@@ -2,3 +2,4 @@ obj-$(CONFIG_SOFTMMU) += machine.o
 obj-y += cpu.o exception.o interrupt.o mmu.o translate.o
 obj-y += exception_helper.o fpu_helper.o int_helper.o \
          interrupt_helper.o mmu_helper.o sys_helper.o
+obj-y += gdbstub.o
diff --git a/target-openrisc/cpu.c b/target-openrisc/cpu.c
index 7718820ecc..aa269fb7a6 100644
--- a/target-openrisc/cpu.c
+++ b/target-openrisc/cpu.c
@@ -155,10 +155,13 @@ static void openrisc_cpu_class_init(ObjectClass *oc, void *data)
     cc->do_interrupt = openrisc_cpu_do_interrupt;
     cc->dump_state = openrisc_cpu_dump_state;
     cc->set_pc = openrisc_cpu_set_pc;
+    cc->gdb_read_register = openrisc_cpu_gdb_read_register;
+    cc->gdb_write_register = openrisc_cpu_gdb_write_register;
 #ifndef CONFIG_USER_ONLY
     cc->get_phys_page_debug = openrisc_cpu_get_phys_page_debug;
     dc->vmsd = &vmstate_openrisc_cpu;
 #endif
+    cc->gdb_num_core_regs = 32 + 3;
 }
 
 static void cpu_register(const OpenRISCCPUInfo *info)
diff --git a/target-openrisc/cpu.h b/target-openrisc/cpu.h
index 3ddb7674c7..8fd0bc0bf0 100644
--- a/target-openrisc/cpu.h
+++ b/target-openrisc/cpu.h
@@ -350,6 +350,8 @@ void openrisc_cpu_do_interrupt(CPUState *cpu);
 void openrisc_cpu_dump_state(CPUState *cpu, FILE *f,
                              fprintf_function cpu_fprintf, int flags);
 hwaddr openrisc_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
+int openrisc_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
+int openrisc_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 void openrisc_translate_init(void);
 int cpu_openrisc_handle_mmu_fault(CPUOpenRISCState *env,
                                   target_ulong address,
diff --git a/target-openrisc/gdbstub.c b/target-openrisc/gdbstub.c
new file mode 100644
index 0000000000..18bcc46167
--- /dev/null
+++ b/target-openrisc/gdbstub.c
@@ -0,0 +1,83 @@
+/*
+ * OpenRISC gdb server stub
+ *
+ * Copyright (c) 2003-2005 Fabrice Bellard
+ * Copyright (c) 2013 SUSE LINUX Products GmbH
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "config.h"
+#include "qemu-common.h"
+#include "exec/gdbstub.h"
+
+int openrisc_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    OpenRISCCPU *cpu = OPENRISC_CPU(cs);
+    CPUOpenRISCState *env = &cpu->env;
+
+    if (n < 32) {
+        return gdb_get_reg32(mem_buf, env->gpr[n]);
+    } else {
+        switch (n) {
+        case 32:    /* PPC */
+            return gdb_get_reg32(mem_buf, env->ppc);
+
+        case 33:    /* NPC */
+            return gdb_get_reg32(mem_buf, env->npc);
+
+        case 34:    /* SR */
+            return gdb_get_reg32(mem_buf, env->sr);
+
+        default:
+            break;
+        }
+    }
+    return 0;
+}
+
+int openrisc_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    OpenRISCCPU *cpu = OPENRISC_CPU(cs);
+    CPUClass *cc = CPU_GET_CLASS(cs);
+    CPUOpenRISCState *env = &cpu->env;
+    uint32_t tmp;
+
+    if (n > cc->gdb_num_core_regs) {
+        return 0;
+    }
+
+    tmp = ldl_p(mem_buf);
+
+    if (n < 32) {
+        env->gpr[n] = tmp;
+    } else {
+        switch (n) {
+        case 32: /* PPC */
+            env->ppc = tmp;
+            break;
+
+        case 33: /* NPC */
+            env->npc = tmp;
+            break;
+
+        case 34: /* SR */
+            env->sr = tmp;
+            break;
+
+        default:
+            break;
+        }
+    }
+    return 4;
+}