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Add initial support for 'qSupported' to the debug server.

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This doesn't recognize any features yet, but does parse the features
string.  It advertises an arbitrary packet size of 4k.

Reviewed by:	markj, Scott Phillips <d.scott.phillips@intel.com>
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D20308
This commit is contained in:
John Baldwin 2019-05-24 22:11:37 +00:00
parent 65417f5e27
commit 07e007e1ca
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348253
1 changed files with 64 additions and 1 deletions
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65
usr.sbin/bhyve/gdb.c
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@ -992,6 +992,66 @@ command_equals(const uint8_t *data, size_t len, const char *cmd)
return (memcmp(data, cmd, strlen(cmd)) == 0);
}
static void
check_features(const uint8_t *data, size_t len)
{
char *feature, *next_feature, *str, *value;
bool supported;
str = malloc(len + 1);
memcpy(str, data, len);
str[len] = '\0';
next_feature = str;
while ((feature = strsep(&next_feature, ";")) != NULL) {
/*
* Null features shouldn't exist, but skip if they
* do.
*/
if (strcmp(feature, "") == 0)
continue;
/*
* Look for the value or supported / not supported
* flag.
*/
value = strchr(feature, '=');
if (value != NULL) {
*value = '\0';
value++;
supported = true;
} else {
value = feature + strlen(feature) - 1;
switch (*value) {
case '+':
supported = true;
break;
case '-':
supported = false;
break;
default:
/*
* This is really a protocol error,
* but we just ignore malformed
* features for ease of
* implementation.
*/
continue;
}
value = NULL;
}
/* No currently supported features. */
}
free(str);
start_packet();
/* This is an arbitrary limit. */
append_string("PacketSize=4096");
finish_packet();
}
static void
gdb_query(const uint8_t *data, size_t len)
{
@ -999,7 +1059,6 @@ gdb_query(const uint8_t *data, size_t len)
/*
* TODO:
* - qSearch
* - qSupported
*/
if (command_equals(data, len, "qAttached")) {
start_packet();
@ -1037,6 +1096,10 @@ gdb_query(const uint8_t *data, size_t len)
start_packet();
append_char('l');
finish_packet();
} else if (command_equals(data, len, "qSupported")) {
data += strlen("qSupported");
len -= strlen("qSupported");
check_features(data, len);
} else if (command_equals(data, len, "qThreadExtraInfo")) {
char buf[16];
int tid;