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KGDB: Notify GDB of machine halt, reboot or power off

Browse source 
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>
This commit is contained in:
David Howells 2011-03-18 16:54:31 +00:00
parent e460d64405
commit d57f078b19
2 changed files with 31 additions and 0 deletions
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1
include/linux/kgdb.h
View file

@ -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;

30
kernel/debug/gdbstub.c
View file

@ -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();
}