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cmd.c
107 lines (93 loc) · 3.2 KB
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cmd.c
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/*
* Copyright 2016 Martin Aberg
*
* This file is part of astub.
*
* astub is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* astub is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Handle gdb Remote Serial Protocol commands
*
* Implemented according to "Debugging with gdb", Tenth Edition, for GDB
* version 7.10.1, appendix E gdb Remote Serial Protocol.
*/
#include <stub_arch.h>
#include <hex.h>
#include <pkt.h>
#include <cmd.h>
/* Send a Stop Reply Packet. */
static int send_stop_reply(int gdb_signal)
{
static char pkt[] = {'S', 0, 0, '\0'};
pkt[1] = nibbletohex[(gdb_signal / 0x10) % 0x10];
pkt[2] = nibbletohex[gdb_signal % 0x10];
putpkt(pkt);
return 0;
}
/* pktbuf is used both as command and reply buffer. */
static char pktbuf[1 + REGSBYTES*2 + 1 + 2 + 1];
static int isattached = 0;
int stub_main(int arch_reason)
{
int ret;
int gdb_signal;
gdb_signal = decode_signal(arch_reason);
/* Do not announce stop reply if we were detached. */
if (isattached) {
send_stop_reply(gdb_signal);
}
/* We are now attached. */
isattached = 1;
do {
int cmd;
char *p;
while (getpkt(&pktbuf[0], sizeof(pktbuf)) < 1);
p = &pktbuf[0];
cmd = *p;
if ('?' == cmd) {
send_stop_reply(gdb_signal);
ret = 0;
} else if ('c' == cmd) {
ret = handle_c(p);
} else if ('s' == cmd) {
ret = handle_s(p);
} else if ('D' == cmd) {
ret = handle_D(p);
if (ret & CMD_LEAVE) {
isattached = 0;
}
} else if ('g' == cmd) {
ret = handle_g(p);
} else if ('G' == cmd) {
ret = handle_G(p);
} else if ('P' == cmd) {
ret = handle_P(p);
} else if ('m' == cmd) {
ret = handle_m(p);
} else if ('M' == cmd) {
ret = handle_M(p);
} else {
/*
* For any command not supported by the stub, an empty
* response ('$#00') should be returned.
*/
p = "";
ret = CMD_REPLY;
}
if (ret & CMD_REPLY) {
putpkt(p);
}
} while (!(ret & CMD_LEAVE));
return ret;
}