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gdb(4): Add basic 'qSupported' support

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This is where the host GDB tells us what features it supports, and we
respond with the list we support.  For now, just report PacketSize.
This commit is contained in:
Conrad Meyer 2019-08-22 00:19:41 +00:00
parent 76c8c0902c
commit c4fbbfaa47
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=351366
1 changed files with 107 additions and 0 deletions
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107
sys/gdb/gdb_main.c
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@ -162,12 +162,117 @@ gdb_do_threadinfo(struct thread **thr_iter)
gdb_tx_end();
}
#define BIT(n) (1ull << (n))
enum {
GDB_MULTIPROCESS,
GDB_SWBREAK,
GDB_HWBREAK,
GDB_QRELOCINSN,
GDB_FORK_EVENTS,
GDB_VFORK_EVENTS,
GDB_EXEC_EVENTS,
GDB_VCONT_SUPPORTED,
GDB_QTHREADEVENTS,
GDB_NO_RESUMED,
};
static const char * const gdb_feature_names[] = {
[GDB_MULTIPROCESS] = "multiprocess",
[GDB_SWBREAK] = "swbreak",
[GDB_HWBREAK] = "hwbreak",
[GDB_QRELOCINSN] = "qRelocInsn",
[GDB_FORK_EVENTS] = "fork-events",
[GDB_VFORK_EVENTS] = "vfork-events",
[GDB_EXEC_EVENTS] = "exec-events",
[GDB_VCONT_SUPPORTED] = "vContSupported",
[GDB_QTHREADEVENTS] = "QThreadEvents",
[GDB_NO_RESUMED] = "no-resumed",
};
static void
gdb_do_qsupported(uint32_t *feat)
{
char *tok, *delim, ok;
size_t i, toklen;
/* Parse supported host features */
*feat = 0;
if (gdb_rx_char() != ':')
goto error;
while (gdb_rxsz > 0) {
tok = gdb_rxp;
delim = strchrnul(gdb_rxp, ';');
toklen = (delim - tok);
gdb_rxp += toklen;
gdb_rxsz -= toklen;
if (*delim != '\0') {
*delim = '\0';
gdb_rxp += 1;
gdb_rxsz -= 1;
}
if (toklen < 2)
goto error;
ok = tok[toklen - 1];
if (ok != '-' && ok != '+') {
/*
* GDB only has one KV-pair feature, and we don't
* support it, so ignore and move on.
*/
if (strchr(tok, '=') != NULL)
continue;
/* Not a KV-pair, and not a +/- flag? Malformed. */
goto error;
}
if (ok != '+')
continue;
tok[toklen - 1] = '\0';
for (i = 0; i < nitems(gdb_feature_names); i++)
if (strcmp(gdb_feature_names[i], tok) == 0)
break;
if (i == nitems(gdb_feature_names)) {
/* Unknown GDB feature. */
continue;
}
*feat |= BIT(i);
}
/* Send a supported feature list back */
gdb_tx_begin(0);
gdb_tx_str("PacketSize");
gdb_tx_char('=');
/*
* We don't buffer framing bytes, but we do need to retain a byte for a
* trailing nul.
*/
gdb_tx_varhex(GDB_BUFSZ + strlen("$#nn") - 1);
/*
* Future consideration:
* - vCont
* - multiprocess
* - qXfer:threads:read
*/
gdb_tx_end();
return;
error:
*feat = 0;
gdb_tx_err(EINVAL);
}
static int
gdb_trap(int type, int code)
{
jmp_buf jb;
struct thread *thr_iter;
void *prev_jb;
uint32_t host_features;
prev_jb = kdb_jmpbuf(jb);
if (setjmp(jb) != 0) {
@ -313,6 +418,8 @@ gdb_trap(int type, int code)
gdb_tx_char('C');
gdb_tx_varhex((long)kdb_thread->td_tid);
gdb_tx_end();
} else if (gdb_rx_equal("Supported")) {
gdb_do_qsupported(&host_features);
} else if (gdb_rx_equal("fThreadInfo")) {
thr_iter = kdb_thr_first();
gdb_do_threadinfo(&thr_iter);