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authorDavid Howells <dhowells@redhat.com>2011-03-18 16:54:31 +0000
committerDavid Howells <dhowells@redhat.com>2011-03-18 16:54:31 +0000
commitd57f078b193981d1b7d24193f3118c6b806db0ff (patch)
tree4bbebe3427d64a37627e5626bc42ccfd4560d5cb /kernel/debug
parente460d64405c04581e42aa9cbae76815a2d4e9abe (diff)
downloadlinux-d57f078b193981d1b7d24193f3118c6b806db0ff.tar.bz2
KGDB: Notify GDB of machine halt, reboot or power off
Notify GDB of the machine halting, rebooting or powering off by sending it an exited command (remote protocol command 'W'). This is done by calling: void gdbstub_exit(int status) from the arch's machine_{halt,restart,power_off}() functions with an appropriate exit status to be reported to GDB. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'kernel/debug')
-rw-r--r--kernel/debug/gdbstub.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index 481a7bd2dfe7..a11db956dd62 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1093,3 +1093,33 @@ int gdbstub_state(struct kgdb_state *ks, char *cmd)
put_packet(remcom_out_buffer);
return 0;
}
+
+/**
+ * gdbstub_exit - Send an exit message to GDB
+ * @status: The exit code to report.
+ */
+void gdbstub_exit(int status)
+{
+ unsigned char checksum, ch, buffer[3];
+ int loop;
+
+ buffer[0] = 'W';
+ buffer[1] = hex_asc_hi(status);
+ buffer[2] = hex_asc_lo(status);
+
+ dbg_io_ops->write_char('$');
+ checksum = 0;
+
+ for (loop = 0; loop < 3; loop++) {
+ ch = buffer[loop];
+ checksum += ch;
+ dbg_io_ops->write_char(ch);
+ }
+
+ dbg_io_ops->write_char('#');
+ dbg_io_ops->write_char(hex_asc_hi(checksum));
+ dbg_io_ops->write_char(hex_asc_lo(checksum));
+
+ /* make sure the output is flushed, lest the bootloader clobber it */
+ dbg_io_ops->flush();
+}