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gdb(4): allow bulk write of registers

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Add support for the remote 'G' packet. This is not widely used by gdb
when 'P' is supported, but is technically required by any remote gdb
stub implementation [1].

[1] https://sourceware.org/gdb/current/onlinedocs/gdb/Overview.html

Reviewed by:	cem
MFC after:	1 week
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
NetApp PR:	44
Differential Revision:	https://reviews.freebsd.org/D27644
This commit is contained in:
Mitchell Horne 2020-12-23 14:37:05 -04:00
parent fd29833d9a
commit 3f3cc995a3
1 changed files with 16 additions and 2 deletions
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18
sys/gdb/gdb_main.c
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@ -700,9 +700,23 @@ gdb_trap(int type, int code)
gdb_tx_end();
break;
}
case 'G': /* Write registers. */
gdb_tx_err(0);
case 'G': { /* Write registers. */
char *val;
bool success;
size_t r;
for (success = true, r = 0; r < GDB_NREGS; r++) {
val = gdb_rxp;
if (!gdb_rx_mem(val, gdb_cpu_regsz(r))) {
gdb_tx_err(EINVAL);
success = false;
break;
}
gdb_cpu_setreg(r, val);
}
if (success)
gdb_tx_ok();
break;
}
case 'H': { /* Set thread. */
intmax_t tid;
struct thread *thr;