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| author | David Howells <dhowells@redhat.com> | 2011-03-18 16:54:31 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2011-03-18 16:54:31 +0000 |
| commit | d57f078b193981d1b7d24193f3118c6b806db0ff (patch) | |
| tree | 4bbebe3427d64a37627e5626bc42ccfd4560d5cb | |
| parent | e460d64405c04581e42aa9cbae76815a2d4e9abe (diff) | |
| download | linux-3.10-d57f078b193981d1b7d24193f3118c6b806db0ff.tar.gz linux-3.10-d57f078b193981d1b7d24193f3118c6b806db0ff.tar.bz2 linux-3.10-d57f078b193981d1b7d24193f3118c6b806db0ff.zip | |
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>
| -rw-r--r-- | include/linux/kgdb.h | 1 | ||||
| -rw-r--r-- | kernel/debug/gdbstub.c | 30 |
2 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index 092e4250a45..10ca03d0a25 100644 --- a/include/linux/kgdb.h +++ b/include/linux/kgdb.h @@ -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; diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c index 481a7bd2dfe..a11db956dd6 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(); +} |