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authorJason Wessel <jason.wessel@windriver.com>2011-05-24 10:43:06 -0500
committerJason Wessel <jason.wessel@windriver.com>2011-08-01 13:23:59 -0500
commit37f86b469d73fc2f2a925536fb99b8f513f641b7 (patch)
treef3f5a0c9d360e0bca2a6184b7063a4ab746dc433 /kernel
parentd613d828e8987a1f794378022f900b454fa95403 (diff)
kdb,kgdb: Allow arbitrary kgdb magic knock sequences
The first packet that gdb sends when the kernel is in kdb mode seems to change with every release of gdb. Instead of continuing to add many different gdb packets, change kdb to automatically look for any thing that looks like a gdb packet. Example 1 cold start test: echo g > /proc/sysrq-trigger $D#44+ Example 2 cold start test: echo g > /proc/sysrq-trigger $3#33 The second one should re-enter kdb's shell right away and is purely a test. Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/debug/kdb/kdb_io.c28
1 files changed, 20 insertions, 8 deletions
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 0dbcdfbb6fd..4802eb5840e 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -31,15 +31,21 @@ char kdb_prompt_str[CMD_BUFLEN];
int kdb_trap_printk;
-static void kgdb_transition_check(char *buffer)
+static int kgdb_transition_check(char *buffer)
{
- int slen = strlen(buffer);
- if (strncmp(buffer, "$?#3f", slen) != 0 &&
- strncmp(buffer, "$qSupported", slen) != 0 &&
- strncmp(buffer, "+$qSupported", slen) != 0) {
+ if (buffer[0] != '+' && buffer[0] != '$') {
KDB_STATE_SET(KGDB_TRANS);
kdb_printf("%s", buffer);
+ } else {
+ int slen = strlen(buffer);
+ if (slen > 3 && buffer[slen - 3] == '#') {
+ kdb_gdb_state_pass(buffer);
+ strcpy(buffer, "kgdb");
+ KDB_STATE_SET(DOING_KGDB);
+ return 1;
+ }
}
+ return 0;
}
static int kdb_read_get_key(char *buffer, size_t bufsize)
@@ -251,6 +257,10 @@ poll_again:
case 13: /* enter */
*lastchar++ = '\n';
*lastchar++ = '\0';
+ if (!KDB_STATE(KGDB_TRANS)) {
+ KDB_STATE_SET(KGDB_TRANS);
+ kdb_printf("%s", buffer);
+ }
kdb_printf("\n");
return buffer;
case 4: /* Del */
@@ -382,10 +392,12 @@ poll_again:
* printed characters if we think that
* kgdb is connecting, until the check
* fails */
- if (!KDB_STATE(KGDB_TRANS))
- kgdb_transition_check(buffer);
- else
+ if (!KDB_STATE(KGDB_TRANS)) {
+ if (kgdb_transition_check(buffer))
+ return buffer;
+ } else {
kdb_printf("%c", key);
+ }
}
/* Special escape to kgdb */
if (lastchar - buffer >= 5 &&