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gdb(4): handle single register read packets

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We support bulk reads of the register set, but not reading specific
registers via the 'p' packet. This is useful at least for the 'call'
command in gdb.

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 14:36:08 -04:00
parent c4df8cbfde
commit fd29833d9a
1 changed files with 11 additions and 0 deletions
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11
sys/gdb/gdb_main.c
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@ -755,6 +755,17 @@ gdb_trap(int type, int code)
gdb_tx_ok();
break;
}
case 'p': { /* Read register. */
uintmax_t reg;
if (gdb_rx_varhex(&reg)) {
gdb_tx_err(EINVAL);
break;
}
gdb_tx_begin(0);
gdb_tx_reg(reg);
gdb_tx_end();
break;
}
case 'P': { /* Write register. */
char *val;
uintmax_t reg;