4 Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
6 This file is part of simavr.
8 simavr is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 simavr is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with simavr. If not, see <http://www.gnu.org/licenses/>.
22 #include <netinet/in.h>
23 #include <netinet/tcp.h>
24 #include <arpa/inet.h>
25 #include <sys/socket.h>
35 #include "avr_eeprom.h"
39 typedef struct avr_gdb_t {
41 int listen; // listen socket
42 int s; // current gdb connection
52 // decode line text hex to binary
53 int read_hex_string(const char * src, uint8_t * buffer, int maxlen)
55 uint8_t * dst = buffer;
58 while (*src && maxlen--) {
61 case 'a' ... 'f': b = (b << 4) | (c - 'a' + 0xa); break;
62 case 'A' ... 'F': b = (b << 4) | (c - 'A' + 0xa); break;
63 case '0' ... '9': b = (b << 4) | (c - '0'); break;
66 fprintf(stderr, "%s: huh '%c' (%s)\n", __FUNCTION__, c, src);
80 static void gdb_send_reply(avr_gdb_t * g, char * cmd)
83 uint8_t * dst = reply;
90 sprintf((char*)dst, "#%02x", check);
91 DBG(printf("%s '%s'\n", __FUNCTION__, reply);)
92 send(g->s, reply, dst - reply + 3, 0);
95 static void gdb_send_quick_status(avr_gdb_t * g, uint8_t signal)
99 sprintf(cmd, "T%02x20:%02x;21:%02x%02x;22:%02x%02x%02x00;",
100 signal ? signal : 5, g->avr->data[R_SREG],
101 g->avr->data[R_SPL], g->avr->data[R_SPH],
102 g->avr->pc & 0xff, (g->avr->pc>>8)&0xff, (g->avr->pc>>16)&0xff);
103 gdb_send_reply(g, cmd);
106 static int gdb_change_breakpoint(avr_gdb_t * g, int set, int kind, uint32_t addr, uint32_t len)
108 DBG(printf("set %d kind %d addr %08x len %d (map %08x)\n", set, kind, addr, len, g->watchmap);)
110 if (g->watchmap == 0xffffffff)
111 return -1; // map full
113 // check to see if it exists
114 for (int i = 0; i < 32; i++)
115 if ((g->watchmap & (1 << i)) && g->watch[i].pc == addr) {
116 g->watch[i].len = len;
119 for (int i = 0; i < 32; i++)
120 if (!(g->watchmap & (1 << i))) {
121 g->watchmap |= (1 << i);
122 g->watch[i].len = len;
123 g->watch[i].pc = addr;
124 g->watch[i].kind = kind;
128 for (int i = 0; i < 32; i++)
129 if ((g->watchmap & (1 << i)) && g->watch[i].pc == addr) {
130 g->watchmap &= ~(1 << i);
133 g->watch[i].kind = 0;
140 static int gdb_write_register(avr_gdb_t * g, int regi, uint8_t * src)
144 g->avr->data[regi] = *src;
147 g->avr->data[R_SREG] = * src;
150 g->avr->data[R_SPL] = *src++;
151 g->avr->data[R_SPH] = *src++;
154 g->avr->pc = src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
160 static int gdb_read_register(avr_gdb_t * g, int regi, char * rep)
164 sprintf(rep, "%02x", g->avr->data[regi]);
167 sprintf(rep, "%02x", g->avr->data[R_SREG]);
170 sprintf(rep, "%02x%02x", g->avr->data[R_SPL], g->avr->data[R_SPH]);
173 sprintf(rep, "%02x%02x%02x00",
174 g->avr->pc & 0xff, (g->avr->pc>>8)&0xff, (g->avr->pc>>16)&0xff);
180 static void gdb_handle_command(avr_gdb_t * g, char * cmd)
182 avr_t * avr = g->avr;
184 uint8_t command = *cmd++;
187 gdb_send_quick_status(g, 0);
189 case 'G': { // set all general purpose registers
190 // get their binary form
191 read_hex_string(cmd, (uint8_t*)rep, strlen(cmd));
192 uint8_t *src = (uint8_t*)rep;
193 for (int i = 0; i < 35; i++)
194 src += gdb_write_register(g, i, src);
195 gdb_send_reply(g, "OK");
197 case 'g': { // read all general purpose registers
199 for (int i = 0; i < 35; i++)
200 dst += gdb_read_register(g, i, dst);
201 gdb_send_reply(g, rep);
203 case 'p': { // read register
204 unsigned int regi = 0;
205 sscanf(cmd, "%x", ®i);
206 gdb_read_register(g, regi, rep);
207 gdb_send_reply(g, rep);
209 case 'P': { // write register
210 unsigned int regi = 0;
211 char * val = strchr(cmd, '=');
215 sscanf(cmd, "%x", ®i);
216 read_hex_string(val, (uint8_t*)rep, strlen(val));
217 gdb_write_register(g, regi, (uint8_t*)rep);
218 gdb_send_reply(g, "OK");
220 case 'm': { // read memory
222 sscanf(cmd, "%x,%x", &addr, &len);
223 uint8_t * src = NULL;
225 src = avr->flash + addr;
226 } else if (addr >= 0x800000 && (addr - 0x800000) <= avr->ramend) {
227 src = avr->data + addr - 0x800000;
228 } else if (addr >= 0x810000 && (addr - 0x810000) <= avr->e2end) {
229 avr_eeprom_desc_t ee = {.offset = (addr - 0x810000)};
230 avr_ioctl(avr, AVR_IOCTL_EEPROM_GET, &ee);
234 gdb_send_reply(g, "E01");
236 printf("read memory error %08x, %08x (ramend %04x)\n", addr, len, avr->ramend+1);
237 gdb_send_reply(g, "E01");
242 sprintf(dst, "%02x", *src++);
246 gdb_send_reply(g, rep);
248 case 'M': { // write memory
250 sscanf(cmd, "%x,%x", &addr, &len);
251 char * start = strchr(cmd, ':');
253 gdb_send_reply(g, "E01");
257 read_hex_string(start + 1, avr->flash + addr, strlen(start+1));
258 gdb_send_reply(g, "OK");
259 } else if (addr >= 0x800000 && (addr - 0x800000) <= avr->ramend) {
260 read_hex_string(start + 1, avr->data + addr - 0x800000, strlen(start+1));
261 gdb_send_reply(g, "OK");
262 } else if (addr >= 0x810000 && (addr - 0x810000) <= avr->e2end) {
263 read_hex_string(start + 1, (uint8_t*)rep, strlen(start+1));
264 avr_eeprom_desc_t ee = {.offset = (addr - 0x810000), .size = len, .ee = (uint8_t*)rep };
265 avr_ioctl(avr, AVR_IOCTL_EEPROM_SET, &ee);
266 gdb_send_reply(g, "OK");
268 printf("write memory error %08x, %08x\n", addr, len);
269 gdb_send_reply(g, "E01");
272 case 'c': { // continue
273 avr->state = cpu_Running;
276 avr->state = cpu_Step;
278 case 'Z': // set clear break/watchpoint
280 uint32_t kind, addr, len;
281 sscanf(cmd, "%d,%x,%x", &kind, &addr, &len);
282 // printf("breakbpoint %d, %08x, %08x\n", kind, addr, len);
284 case 0: // software breakpoint
285 case 1: // hardware breakpoint
286 if (addr <= avr->flashend) {
287 if (gdb_change_breakpoint(g, command == 'Z', kind, addr, len))
288 gdb_send_reply(g, "E01");
290 gdb_send_reply(g, "OK");
292 gdb_send_reply(g, "E01"); // out of flash address
295 case 2: // write watchpoint
296 case 3: // read watchpoint
297 case 4: // access watchpoint
299 gdb_send_reply(g, "");
303 gdb_send_reply(g, "");
307 static int gdb_network_handler(avr_gdb_t * g, uint32_t dosleep)
314 FD_SET(g->s, &read_set);
317 FD_SET(g->listen, &read_set);
320 struct timeval timo = { 0, dosleep }; // short, but not too short interval
321 int ret = select(max, &read_set, NULL, NULL, &timo);
326 if (FD_ISSET(g->listen, &read_set)) {
327 g->s = accept(g->listen, NULL, NULL);
330 perror("gdb_network_handler accept");
335 setsockopt (g->s, IPPROTO_TCP, TCP_NODELAY, &i, sizeof (i));
336 g->avr->state = cpu_Stopped;
337 printf("%s connection opened\n", __FUNCTION__);
340 if (FD_ISSET(g->s, &read_set)) {
341 uint8_t buffer[1024];
343 ssize_t r = recv(g->s, buffer, sizeof(buffer)-1, 0);
346 printf("%s connection closed\n", __FUNCTION__);
348 g->watchmap = 0; // clear breakpoints
349 g->avr->state = cpu_Running; // resume
354 perror("gdb_network_handler recv");
359 // printf("%s: received %d bytes\n'%s'\n", __FUNCTION__, r, buffer);
360 // hdump("gdb", buffer, r);
362 uint8_t * src = buffer;
363 while (*src == '+' || *src == '-')
365 // control C -- lets send the guy a nice status packet
368 g->avr->state = cpu_StepDone;
369 printf("GDB hit control-c\n");
373 uint8_t * end = buffer + r - 1;
374 while (end > src && *end != '#')
378 DBG(printf("GDB command = '%s'\n", src);)
380 send(g->s, "+", 1, 0);
382 gdb_handle_command(g, (char*)src);
388 int avr_gdb_processor(avr_t * avr, int sleep)
390 if (!avr || !avr->gdb)
392 avr_gdb_t * g = avr->gdb;
394 if (g->watchmap && avr->state == cpu_Running) {
395 for (int i = 0; i < 32; i++)
396 if ((g->watchmap & (1 << i)) && g->watch[i].pc == avr->pc) {
397 DBG(printf("avr_gdb_processor hit breakpoint at %08x\n", avr->pc);)
398 gdb_send_quick_status(g, 0);
399 avr->state = cpu_Stopped;
402 if (avr->state == cpu_StepDone) {
403 gdb_send_quick_status(g, 0);
404 avr->state = cpu_Stopped;
406 // this also sleeps for a bit
407 return gdb_network_handler(g, sleep);
411 int avr_gdb_init(avr_t * avr)
413 avr_gdb_t * g = malloc(sizeof(avr_gdb_t));
414 memset(g, 0, sizeof(avr_gdb_t));
418 if ((g->listen = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
419 fprintf(stderr, "Can't create socket: %s", strerror(errno));
424 setsockopt(g->listen, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
426 struct sockaddr_in address = { 0 };
427 address.sin_family = AF_INET;
428 address.sin_port = htons (avr->gdb_port);
430 if (bind(g->listen, (struct sockaddr *) &address, sizeof(address))) {
431 fprintf(stderr, "Can not bind socket: %s", strerror(errno));
434 if (listen(g->listen, 1)) {
438 printf("avr_gdb_init listening on port %d\n", avr->gdb_port);