The XML packet could be supported by required architecture if the
architecture defines CONFIG_HAVE_ARCH_KGDB_QXFER_PKT and implement its own
kgdb_arch_handle_qxfer_pkt(). Except for the kgdb_arch_handle_qxfer_pkt(),
the architecture also needs to record the feature supported by gdb stub
into the kgdb_arch_gdb_stub_feature, and these features will be reported
to host gdb when gdb stub receives the qSupported packet.
Signed-off-by: Vincent Chen <vincent.c...@sifive.com>
---
include/linux/kgdb.h | 11 +++++++++++
kernel/debug/gdbstub.c | 13 +++++++++++++
lib/Kconfig.kgdb | 5 +++++
3 files changed, 29 insertions(+)
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index b072aeb1fd78..414bef20a8f3 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -177,6 +177,17 @@ kgdb_arch_handle_exception(int vector, int signo, int
err_code,
struct pt_regs *regs);
/**
+ * kgdb_arch_handle_qxfer_pkt - Handle architecture specific GDB XML
+ * packets.
+ * @remcom_in_buffer: The buffer of the packet we have read.
+ * @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
+ */
+
+extern void
+kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer,
+ char *remcom_out_buffer);
+
+/**
* kgdb_call_nmi_hook - Call kgdb_nmicallback() on the current CPU
* @ignored: This parameter is only here to match the prototype.
*
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index 4b280fc7dd67..a0617c883029 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -792,6 +792,19 @@ static void gdb_cmd_query(struct kgdb_state *ks)
}
break;
#endif
+#ifdef CONFIG_HAVE_ARCH_KGDB_QXFER_PKT
+ case 'S':
+ if (!strncmp(remcom_in_buffer, "qSupported:", 11))
+ strcpy(remcom_out_buffer, kgdb_arch_gdb_stub_feature);
+ break;
+ case 'X':
+ if (!strncmp(remcom_in_buffer, "qXfer:", 6))
+ kgdb_arch_handle_qxfer_pkt(remcom_in_buffer,
+ remcom_out_buffer);
+ break;
+#endif
+ default:
+ break;
}
}
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index 933680b59e2d..d7f70335efaf 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -3,6 +3,11 @@
config HAVE_ARCH_KGDB
bool
+# set if architecture has the its kgdb_arch_handle_qxfer_pkt
+# function to enable gdb stub to address XML packet sent from GDB.
+config HAVE_ARCH_KGDB_QXFER_PKT
+ bool
+
menuconfig KGDB
bool "KGDB: kernel debugger"
depends on HAVE_ARCH_KGDB
--
2.7.4
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