2 * Copyright (c) 2004 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/ctype.h>
34 #include <sys/libkern.h>
35 #include <sys/ttydefaults.h>
37 #include <machine/gdb_machdep.h>
38 #include <machine/kdb.h>
41 #include <gdb/gdb_int.h>
43 static char gdb_rxbuf[GDB_BUFSZ];
46 static char gdb_txbuf[GDB_BUFSZ];
47 char *gdb_txp = NULL; /* Used in inline functions. */
49 #define C2N(c) (((c) < 'A') ? (c) - '0' : \
50 10 + (((c) < 'a') ? (c) - 'A' : (c) - 'a'))
51 #define N2C(n) (((n) < 10) ? (n) + '0' : (n) + 'a' - 10)
54 * Get a single character
63 c = gdb_cur->gdb_getc();
67 printf("Received ^C; trying to switch back to ddb.\n");
69 if (kdb_dbbe_select("ddb") != 0)
70 printf("The ddb backend could not be selected.\n");
72 printf("using longjmp, hope it works!\n");
80 * Functions to receive and extract from a packet.
91 * Wait for the start character, ignore all others.
92 * XXX needs a timeout.
94 while ((c = gdb_getc()) != '$')
97 /* Read until a # or end of buffer is found. */
100 while (gdb_rxsz < sizeof(gdb_rxbuf) - 1) {
104 gdb_rxbuf[gdb_rxsz++] = c;
107 gdb_rxbuf[gdb_rxsz] = 0;
110 /* Bail out on a buffer overflow. */
112 gdb_cur->gdb_putc('-');
117 cksum -= (C2N(c) << 4) & 0xf0;
119 cksum -= C2N(c) & 0x0f;
120 gdb_cur->gdb_putc((cksum == 0) ? '+' : '-');
122 printf("GDB: packet `%s' has invalid checksum\n",
124 } while (cksum != 0);
131 gdb_rx_equal(const char *str)
136 if (len > gdb_rxsz || strncmp(str, gdb_rxp, len) != 0)
144 gdb_rx_mem(unsigned char *addr, size_t size)
153 if (size * 2 != gdb_rxsz)
156 prev = kdb_jmpbuf(jb);
162 c = (C2N(gdb_rxp[0]) << 4) & 0xf0;
163 c |= C2N(gdb_rxp[1]) & 0x0f;
168 kdb_cpu_sync_icache(addr, size);
170 (void)kdb_jmpbuf(prev);
171 return ((ret == 0) ? 1 : 0);
175 gdb_rx_varhex(uintmax_t *vp)
181 neg = (c == '-') ? 1 : 0;
185 gdb_rxp -= ((c == -1) ? 0 : 1) + neg;
186 gdb_rxsz += ((c == -1) ? 0 : 1) + neg;
194 } while (isxdigit(c));
199 *vp = (neg) ? -v : v;
204 * Function to build and send a package.
208 gdb_tx_begin(char tp)
221 unsigned char c, cksum;
224 gdb_cur->gdb_putc('$');
228 while (p < gdb_txp) {
229 /* Send a character and start run-length encoding. */
231 gdb_cur->gdb_putc(c);
234 /* Determine run-length and update checksum. */
235 while (p < gdb_txp && *p == c) {
239 /* Emit the run-length encoded string. */
240 while (runlen >= 97) {
241 gdb_cur->gdb_putc('*');
243 gdb_cur->gdb_putc(97+29);
247 gdb_cur->gdb_putc(c);
253 gdb_cur->gdb_putc(c);
259 /* Don't emit '$', '#', '+' or '-'. */
261 gdb_cur->gdb_putc(c);
265 if (runlen == 6 || runlen == 14 || runlen == 16) {
266 gdb_cur->gdb_putc(c);
270 gdb_cur->gdb_putc('*');
272 gdb_cur->gdb_putc(runlen+29);
276 gdb_cur->gdb_putc('#');
278 gdb_cur->gdb_putc(N2C(c));
280 gdb_cur->gdb_putc(N2C(c));
289 gdb_tx_mem(const unsigned char *addr, size_t size)
295 prev = kdb_jmpbuf(jb);
299 *gdb_txp++ = N2C(*addr >> 4);
300 *gdb_txp++ = N2C(*addr & 0x0f);
304 (void)kdb_jmpbuf(prev);
305 return ((ret == 0) ? 1 : 0);
309 gdb_tx_reg(int regnum)
314 regp = gdb_cpu_getreg(regnum, ®sz);
316 /* Register unavailable. */
322 gdb_tx_mem(regp, regsz);
325 /* Read binary data up until the end of the packet or until we have datalen decoded bytes */
327 gdb_rx_bindata(unsigned char *data, size_t datalen, size_t *amt)
333 while (*amt < datalen) {
338 /* Escaped character up next */
340 /* Truncated packet? Bail out */
341 if ((c = gdb_rx_char()) == -1)
345 *(data++) = c & 0xff;
353 gdb_search_mem(const unsigned char *addr, size_t size, const unsigned char *pat, size_t patlen, const unsigned char **found)
359 prev = kdb_jmpbuf(jb);
362 *found = memmem(addr, size, pat, patlen);
364 (void)kdb_jmpbuf(prev);
365 return ((ret == 0) ? 1 : 0);