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Commit d57f078b authored by David Howells's avatar David Howells
Browse files

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: default avatarDavid Howells <dhowells@redhat.com>
parent e460d644

include/linux/kgdb.h

+1 −0
Original line number Diff line number Diff line
@@ -297,6 +297,7 @@ extern int 
kgdb_handle_exception(int ex_vector, int signo, int err_code,

		      struct pt_regs *regs);

extern int kgdb_nmicallback(int cpu, void *regs);

extern void gdbstub_exit(int status);



extern int			kgdb_single_step;

extern atomic_t			kgdb_active;

kernel/debug/gdbstub.c

+30 −0
Original line number Diff line number Diff line
@@ -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();

}