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kdb,kgdb: Implement switch and pass buffer from kdb -> gdb

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When switching from kdb mode to kgdb mode packets were getting lost
depending on the size of the fifo queue of the serial chip.  When gdb
initially connects if it is in kdb mode it should entirely send any
character buffer over to the gdbstub when switching connections.

Previously kdb was zero'ing out the character buffer and this could
lead to gdb failing to connect at all, or a lengthy pause could occur
on the initial connect.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jason Wessel 2011-05-23 13:17:41 -05:00
parent 3bdb65ec95
commit f679c4985b
4 changed files with 29 additions and 21 deletions
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22
kernel/debug/gdbstub.c
View file

@ -42,6 +42,8 @@
/* Our I/O buffers. */
static char remcom_in_buffer[BUFMAX];
static char remcom_out_buffer[BUFMAX];
static int gdbstub_use_prev_in_buf;
static int gdbstub_prev_in_buf_pos;
/* Storage for the registers, in GDB format. */
static unsigned long gdb_regs[(NUMREGBYTES +
@ -58,6 +60,13 @@ static int gdbstub_read_wait(void)
int ret = -1;
int i;
if (unlikely(gdbstub_use_prev_in_buf)) {
if (gdbstub_prev_in_buf_pos < gdbstub_use_prev_in_buf)
return remcom_in_buffer[gdbstub_prev_in_buf_pos++];
else
gdbstub_use_prev_in_buf = 0;
}
/* poll any additional I/O interfaces that are defined */
while (ret < 0)
for (i = 0; kdb_poll_funcs[i] != NULL; i++) {
@ -109,7 +118,6 @@ static void get_packet(char *buffer)
buffer[count] = ch;
count = count + 1;
}
buffer[count] = 0;
if (ch == '#') {
xmitcsum = hex_to_bin(gdbstub_read_wait()) << 4;
@ -124,6 +132,7 @@ static void get_packet(char *buffer)
if (dbg_io_ops->flush)
dbg_io_ops->flush();
}
buffer[count] = 0;
} while (checksum != xmitcsum);
}
@ -1082,12 +1091,11 @@ int gdbstub_state(struct kgdb_state *ks, char *cmd)
case 'c':
strcpy(remcom_in_buffer, cmd);
return 0;
case '?':
gdb_cmd_status(ks);
break;
case '\0':
strcpy(remcom_out_buffer, "");
break;
case '$':
strcpy(remcom_in_buffer, cmd);
gdbstub_use_prev_in_buf = strlen(remcom_in_buffer);
gdbstub_prev_in_buf_pos = 0;
return 0;
}
dbg_io_ops->write_char('+');
put_packet(remcom_out_buffer);