Commit d57f078b193981d1b7d24193f3118c6b806db0ff
1 parent
e460d64405
Exists in
master
and in
39 other branches
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>
Showing 2 changed files with 31 additions and 0 deletions Side-by-side Diff
include/linux/kgdb.h
... | ... | @@ -297,6 +297,7 @@ |
297 | 297 | kgdb_handle_exception(int ex_vector, int signo, int err_code, |
298 | 298 | struct pt_regs *regs); |
299 | 299 | extern int kgdb_nmicallback(int cpu, void *regs); |
300 | +extern void gdbstub_exit(int status); | |
300 | 301 | |
301 | 302 | extern int kgdb_single_step; |
302 | 303 | extern atomic_t kgdb_active; |
kernel/debug/gdbstub.c
... | ... | @@ -1093,4 +1093,34 @@ |
1093 | 1093 | put_packet(remcom_out_buffer); |
1094 | 1094 | return 0; |
1095 | 1095 | } |
1096 | + | |
1097 | +/** | |
1098 | + * gdbstub_exit - Send an exit message to GDB | |
1099 | + * @status: The exit code to report. | |
1100 | + */ | |
1101 | +void gdbstub_exit(int status) | |
1102 | +{ | |
1103 | + unsigned char checksum, ch, buffer[3]; | |
1104 | + int loop; | |
1105 | + | |
1106 | + buffer[0] = 'W'; | |
1107 | + buffer[1] = hex_asc_hi(status); | |
1108 | + buffer[2] = hex_asc_lo(status); | |
1109 | + | |
1110 | + dbg_io_ops->write_char('$'); | |
1111 | + checksum = 0; | |
1112 | + | |
1113 | + for (loop = 0; loop < 3; loop++) { | |
1114 | + ch = buffer[loop]; | |
1115 | + checksum += ch; | |
1116 | + dbg_io_ops->write_char(ch); | |
1117 | + } | |
1118 | + | |
1119 | + dbg_io_ops->write_char('#'); | |
1120 | + dbg_io_ops->write_char(hex_asc_hi(checksum)); | |
1121 | + dbg_io_ops->write_char(hex_asc_lo(checksum)); | |
1122 | + | |
1123 | + /* make sure the output is flushed, lest the bootloader clobber it */ | |
1124 | + dbg_io_ops->flush(); | |
1125 | +} |