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>
35 #include <machine/gdb_machdep.h>
38 #include <gdb/gdb_int.h>
40 static char gdb_rxbuf[GDB_BUFSZ];
43 static char gdb_txbuf[GDB_BUFSZ];
44 char *gdb_txp = NULL; /* Used in inline functions. */
46 #define C2N(c) (((c) < 'A') ? (c) - '0' : \
47 10 + (((c) < 'a') ? (c) - 'A' : (c) - 'a'))
48 #define N2C(n) (((n) < 10) ? (n) + '0' : (n) + 'a' - 10)
51 * Functions to receive and extract from a packet.
62 * Wait for the start character, ignore all others.
63 * XXX needs a timeout.
65 while ((c = gdb_cur->gdb_getc()) != '$')
68 /* Read until a # or end of buffer is found. */
71 while (gdb_rxsz < sizeof(gdb_rxbuf) - 1) {
72 c = gdb_cur->gdb_getc();
75 gdb_rxbuf[gdb_rxsz++] = c;
78 gdb_rxbuf[gdb_rxsz] = 0;
81 /* Bail out on a buffer overflow. */
83 gdb_cur->gdb_putc('-');
87 c = gdb_cur->gdb_getc();
88 cksum -= (C2N(c) << 4) & 0xf0;
89 c = gdb_cur->gdb_getc();
90 cksum -= C2N(c) & 0x0f;
91 gdb_cur->gdb_putc((cksum == 0) ? '+' : '-');
93 printf("GDB: packet `%s' has invalid checksum\n",
102 gdb_rx_equal(const char *str)
107 if (len > gdb_rxsz || strncmp(str, gdb_rxp, len) != 0)
115 gdb_rx_mem(unsigned char *addr, size_t size)
122 if (size * 2 != gdb_rxsz)
125 prev = kdb_jmpbuf(jb);
129 c = (C2N(gdb_rxp[0]) << 4) & 0xf0;
130 c |= C2N(gdb_rxp[1]) & 0x0f;
136 (void)kdb_jmpbuf(prev);
137 return ((ret == 0) ? 1 : 0);
141 gdb_rx_varhex(uintmax_t *vp)
147 neg = (c == '-') ? 1 : 0;
151 gdb_rxp -= ((c == -1) ? 0 : 1) + neg;
152 gdb_rxsz += ((c == -1) ? 0 : 1) + neg;
160 } while (isxdigit(c));
165 *vp = (neg) ? -v : v;
170 * Function to build and send a package.
174 gdb_tx_begin(char tp)
187 unsigned char c, cksum;
190 gdb_cur->gdb_putc('$');
194 while (p < gdb_txp) {
195 /* Send a character and start run-length encoding. */
197 gdb_cur->gdb_putc(c);
200 /* Determine run-length and update checksum. */
201 while (p < gdb_txp && *p == c) {
205 /* Emit the run-length encoded string. */
206 while (runlen >= 97) {
207 gdb_cur->gdb_putc('*');
209 gdb_cur->gdb_putc(97+29);
213 gdb_cur->gdb_putc(c);
219 gdb_cur->gdb_putc(c);
225 /* Don't emit '$', '#', '+' or '-'. */
227 gdb_cur->gdb_putc(c);
231 if (runlen == 6 || runlen == 14 || runlen == 16) {
232 gdb_cur->gdb_putc(c);
236 gdb_cur->gdb_putc('*');
238 gdb_cur->gdb_putc(runlen+29);
242 gdb_cur->gdb_putc('#');
244 gdb_cur->gdb_putc(N2C(c));
246 gdb_cur->gdb_putc(N2C(c));
248 c = gdb_cur->gdb_getc();
255 gdb_tx_mem(const unsigned char *addr, size_t size)
261 prev = kdb_jmpbuf(jb);
265 *gdb_txp++ = N2C(*addr >> 4);
266 *gdb_txp++ = N2C(*addr & 0x0f);
270 (void)kdb_jmpbuf(prev);
271 return ((ret == 0) ? 1 : 0);
275 gdb_tx_reg(int regnum)
280 regp = gdb_cpu_getreg(regnum, ®sz);
282 /* Register unavailable. */
288 gdb_tx_mem(regp, regsz);