[PATCH 4/4] gdbstub/aarch64: add SPSel register

[Manos Pitsidianakis]

Signed-off-by: Manos Pitsidianakis <manos.pitsidiana...@linaro.org>
---
 gdb-xml/aarch64-core.xml | 6 ++++++
 target/arm/gdbstub64.c   | 8 ++++++++
 2 files changed, 14 insertions(+)

diff --git a/gdb-xml/aarch64-core.xml b/gdb-xml/aarch64-core.xml
index 
dffc92303fc7b7e8221cf6afd6009101f34352ed..42793f063d9a9180d6233376a03835238c4a9c53
 100644
--- a/gdb-xml/aarch64-core.xml
+++ b/gdb-xml/aarch64-core.xml
@@ -120,4 +120,10 @@
     <field name="D" start="9" end="9"/>
   </flags>
   <reg name="DAIF" bitsize="64" type="daif_flags"/>
+
+  <flags id="spsel_flags" size="8">
+    <!-- Stack Pointer.  -->
+    <field name="SP" start="0" end="0"/>
+  </flags>
+  <reg name="SPSel" bitsize="64" type="spsel_flags"/>
 </feature>
diff --git a/target/arm/gdbstub64.c b/target/arm/gdbstub64.c
index 
6c424ed361e32e12836c6ef00a06397bd684bac4..143e2b104f961da603404cdfb5247b044f0e84cd
 100644
--- a/target/arm/gdbstub64.c
+++ b/target/arm/gdbstub64.c
@@ -57,6 +57,9 @@ int aarch64_cpu_gdb_read_register(CPUState *cs, GByteArray 
*mem_buf, int n)
     case 36:
         /* DAIF */
         return gdb_get_reg64(mem_buf, env->daif);
+    case 37:
+        /* SPSel */
+        return gdb_get_reg64(mem_buf, env->pstate & PSTATE_SP);
     }
     /* Unknown register.  */
     return 0;
@@ -98,6 +101,11 @@ int aarch64_cpu_gdb_write_register(CPUState *cs, uint8_t 
*mem_buf, int n)
         /* DAIF */
         env->daif = tmp & PSTATE_DAIF;
         return 8;
+    case 37:
+        /* SPSel */
+        tmp = (pstate_read(env) & ~PSTATE_SP) | (tmp & PSTATE_SP);
+        pstate_write(env, tmp);
+        return 8;
     }
     /* Unknown register.  */
     return 0;

-- 
2.47.2