[Qemu-devel] [PATCH v2 04/12] AArch64: Add gdb stub

[Qemu-devel] [PATCH v2 04/12] AArch64: Add gdb stub

[John Rigby]

From: Alexander Graf <agraf@suse.de>

We want to be able to debug AArch64 guests. So let's add the respective gdb
stub functions and xml descriptions that allow us to do so.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 gdb-xml/aarch64-core.xml |   46 +++++++++++++++++++++++++
 gdb-xml/aarch64-fpu.xml  |   86 ++++++++++++++++++++++++++++++++++++++++++++++
 gdbstub.c                |   53 ++++++++++++++++++++++++++++
 3 files changed, 185 insertions(+)
 create mode 100644 gdb-xml/aarch64-core.xml
 create mode 100644 gdb-xml/aarch64-fpu.xml

diff --git a/gdb-xml/aarch64-core.xml b/gdb-xml/aarch64-core.xml
new file mode 100644
index 0000000..e1e9dc3
--- /dev/null
+++ b/gdb-xml/aarch64-core.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2009-2012 Free Software Foundation, Inc.
+     Contributed by ARM Ltd.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.aarch64.core">
+  <reg name="x0" bitsize="64"/>
+  <reg name="x1" bitsize="64"/>
+  <reg name="x2" bitsize="64"/>
+  <reg name="x3" bitsize="64"/>
+  <reg name="x4" bitsize="64"/>
+  <reg name="x5" bitsize="64"/>
+  <reg name="x6" bitsize="64"/>
+  <reg name="x7" bitsize="64"/>
+  <reg name="x8" bitsize="64"/>
+  <reg name="x9" bitsize="64"/>
+  <reg name="x10" bitsize="64"/>
+  <reg name="x11" bitsize="64"/>
+  <reg name="x12" bitsize="64"/>
+  <reg name="x13" bitsize="64"/>
+  <reg name="x14" bitsize="64"/>
+  <reg name="x15" bitsize="64"/>
+  <reg name="x16" bitsize="64"/>
+  <reg name="x17" bitsize="64"/>
+  <reg name="x18" bitsize="64"/>
+  <reg name="x19" bitsize="64"/>
+  <reg name="x20" bitsize="64"/>
+  <reg name="x21" bitsize="64"/>
+  <reg name="x22" bitsize="64"/>
+  <reg name="x23" bitsize="64"/>
+  <reg name="x24" bitsize="64"/>
+  <reg name="x25" bitsize="64"/>
+  <reg name="x26" bitsize="64"/>
+  <reg name="x27" bitsize="64"/>
+  <reg name="x28" bitsize="64"/>
+  <reg name="x29" bitsize="64"/>
+  <reg name="x30" bitsize="64"/>
+  <reg name="sp" bitsize="64" type="data_ptr"/>
+
+  <reg name="pc" bitsize="64" type="code_ptr"/>
+  <reg name="cpsr" bitsize="32"/>
+</feature>
diff --git a/gdb-xml/aarch64-fpu.xml b/gdb-xml/aarch64-fpu.xml
new file mode 100644
index 0000000..997197e
--- /dev/null
+++ b/gdb-xml/aarch64-fpu.xml
@@ -0,0 +1,86 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2009-2012 Free Software Foundation, Inc.
+     Contributed by ARM Ltd.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.aarch64.fpu">
+  <vector id="v2d" type="ieee_double" count="2"/>
+  <vector id="v2u" type="uint64" count="2"/>
+  <vector id="v2i" type="int64" count="2"/>
+  <vector id="v4f" type="ieee_single" count="4"/>
+  <vector id="v4u" type="uint32" count="4"/>
+  <vector id="v4i" type="int32" count="4"/>
+  <vector id="v8u" type="uint16" count="8"/>
+  <vector id="v8i" type="int16" count="8"/>
+  <vector id="v16u" type="uint8" count="16"/>
+  <vector id="v16i" type="int8" count="16"/>
+  <vector id="v1u" type="uint128" count="1"/>
+  <vector id="v1i" type="int128" count="1"/>
+  <union id="vnd">
+    <field name="f" type="v2d"/>
+    <field name="u" type="v2u"/>
+    <field name="s" type="v2i"/>
+  </union>
+  <union id="vns">
+    <field name="f" type="v4f"/>
+    <field name="u" type="v4u"/>
+    <field name="s" type="v4i"/>
+  </union>
+  <union id="vnh">
+    <field name="u" type="v8u"/>
+    <field name="s" type="v8i"/>
+  </union>
+  <union id="vnb">
+    <field name="u" type="v16u"/>
+    <field name="s" type="v16i"/>
+  </union>
+  <union id="vnq">
+    <field name="u" type="v1u"/>
+    <field name="s" type="v1i"/>
+  </union>
+  <union id="aarch64v">
+    <field name="d" type="vnd"/>
+    <field name="s" type="vns"/>
+    <field name="h" type="vnh"/>
+    <field name="b" type="vnb"/>
+    <field name="q" type="vnq"/>
+  </union>
+  <reg name="v0" bitsize="128" type="aarch64v" regnum="34"/>
+  <reg name="v1" bitsize="128" type="aarch64v" />
+  <reg name="v2" bitsize="128" type="aarch64v" />
+  <reg name="v3" bitsize="128" type="aarch64v" />
+  <reg name="v4" bitsize="128" type="aarch64v" />
+  <reg name="v5" bitsize="128" type="aarch64v" />
+  <reg name="v6" bitsize="128" type="aarch64v" />
+  <reg name="v7" bitsize="128" type="aarch64v" />
+  <reg name="v8" bitsize="128" type="aarch64v" />
+  <reg name="v9" bitsize="128" type="aarch64v" />
+  <reg name="v10" bitsize="128" type="aarch64v"/>
+  <reg name="v11" bitsize="128" type="aarch64v"/>
+  <reg name="v12" bitsize="128" type="aarch64v"/>
+  <reg name="v13" bitsize="128" type="aarch64v"/>
+  <reg name="v14" bitsize="128" type="aarch64v"/>
+  <reg name="v15" bitsize="128" type="aarch64v"/>
+  <reg name="v16" bitsize="128" type="aarch64v"/>
+  <reg name="v17" bitsize="128" type="aarch64v"/>
+  <reg name="v18" bitsize="128" type="aarch64v"/>
+  <reg name="v19" bitsize="128" type="aarch64v"/>
+  <reg name="v20" bitsize="128" type="aarch64v"/>
+  <reg name="v21" bitsize="128" type="aarch64v"/>
+  <reg name="v22" bitsize="128" type="aarch64v"/>
+  <reg name="v23" bitsize="128" type="aarch64v"/>
+  <reg name="v24" bitsize="128" type="aarch64v"/>
+  <reg name="v25" bitsize="128" type="aarch64v"/>
+  <reg name="v26" bitsize="128" type="aarch64v"/>
+  <reg name="v27" bitsize="128" type="aarch64v"/>
+  <reg name="v28" bitsize="128" type="aarch64v"/>
+  <reg name="v29" bitsize="128" type="aarch64v"/>
+  <reg name="v30" bitsize="128" type="aarch64v"/>
+  <reg name="v31" bitsize="128" type="aarch64v"/>
+  <reg name="fpsr" bitsize="32"/>
+  <reg name="fpcr" bitsize="32"/>
+</feature>
diff --git a/gdbstub.c b/gdbstub.c
index e80e1d3..92b6b2d 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -935,6 +935,59 @@ static int cpu_gdb_write_register(CPUSPARCState *env, uint8_t *mem_buf, int n)
     return 8;
 #endif
 }
+#elif defined (TARGET_AARCH64)
+
+#define NUM_CORE_REGS 34
+#define GDB_CORE_XML "aarch64-core.xml"
+
+static int cpu_gdb_read_register(CPUARMState *env, uint8_t *mem_buf, int n)
+{
+    if (n < 31) {
+        /* Core integer register.  */
+        GET_REG64(env->xregs[n]);
+    }
+    switch (n) {
+    case 31:
+        GET_REG64(env->sp);
+        break;
+    case 32:
+        GET_REG64(env->pc);
+        break;
+    case 33:
+        GET_REG32(env->pstate);
+        break;
+    }
+    /* Unknown register.  */
+    return 0;
+}
+
+static int cpu_gdb_write_register(CPUARMState *env, uint8_t *mem_buf, int n)
+{
+    uint64_t tmp;
+
+    tmp = ldq_p(mem_buf);
+
+    if (n < 31) {
+        /* Core integer register.  */
+        env->xregs[n] = tmp;
+        return 8;
+    }
+    switch (n) {
+    case 31:
+        env->sp = tmp;
+        return 8;
+    case 32:
+        env->pc = tmp;
+        return 8;
+    case 33:
+        /* CPSR */
+        env->pstate = tmp;
+        return 4;
+    }
+    /* Unknown register.  */
+    return 0;
+}
+
 #elif defined (TARGET_ARM)
 
 /* Old gdb always expect FPA registers.  Newer (xml-aware) gdb only expect
-- 
1.7.9.5