The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/gdb/gdb_packet.c

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    1 /*-
    2  * Copyright (c) 2004 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    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.
   14  *
   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.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.0/sys/gdb/gdb_packet.c 170473 2007-06-09 21:55:17Z marcel $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/ctype.h>
   33 #include <sys/kdb.h>
   34 
   35 #include <machine/gdb_machdep.h>
   36 #include <machine/kdb.h>
   37 
   38 #include <gdb/gdb.h>
   39 #include <gdb/gdb_int.h>
   40 
   41 static char gdb_rxbuf[GDB_BUFSZ];
   42 char *gdb_rxp = NULL;
   43 size_t gdb_rxsz = 0;
   44 static char gdb_txbuf[GDB_BUFSZ];
   45 char *gdb_txp = NULL;                   /* Used in inline functions. */
   46 
   47 #define C2N(c)  (((c) < 'A') ? (c) - '' : \
   48             10 + (((c) < 'a') ? (c) - 'A' : (c) - 'a'))
   49 #define N2C(n)  (((n) < 10) ? (n) + '' : (n) + 'a' - 10)
   50 
   51 /*
   52  * Get a single character
   53  */
   54 
   55 static int
   56 gdb_getc(void)
   57 {
   58         int c;
   59 
   60         do
   61                 c = gdb_cur->gdb_getc();
   62         while (c == -1);
   63         return (c);
   64 }
   65 
   66 /*
   67  * Functions to receive and extract from a packet.
   68  */
   69 
   70 int
   71 gdb_rx_begin(void)
   72 {
   73         int c, cksum;
   74 
   75         gdb_rxp = NULL;
   76         do {
   77                 /*
   78                  * Wait for the start character, ignore all others.
   79                  * XXX needs a timeout.
   80                  */
   81                 while ((c = gdb_getc()) != '$')
   82                         ;
   83 
   84                 /* Read until a # or end of buffer is found. */
   85                 cksum = 0;
   86                 gdb_rxsz = 0;
   87                 while (gdb_rxsz < sizeof(gdb_rxbuf) - 1) {
   88                         c = gdb_getc();
   89                         if (c == '#')
   90                                 break;
   91                         gdb_rxbuf[gdb_rxsz++] = c;
   92                         cksum += c;
   93                 }
   94                 gdb_rxbuf[gdb_rxsz] = 0;
   95                 cksum &= 0xff;
   96 
   97                 /* Bail out on a buffer overflow. */
   98                 if (c != '#') {
   99                         gdb_cur->gdb_putc('-');
  100                         return (ENOSPC);
  101                 }
  102 
  103                 c = gdb_getc();
  104                 cksum -= (C2N(c) << 4) & 0xf0;
  105                 c = gdb_getc();
  106                 cksum -= C2N(c) & 0x0f;
  107                 gdb_cur->gdb_putc((cksum == 0) ? '+' : '-');
  108                 if (cksum != 0)
  109                         printf("GDB: packet `%s' has invalid checksum\n",
  110                             gdb_rxbuf);
  111         } while (cksum != 0);
  112 
  113         gdb_rxp = gdb_rxbuf;
  114         return (0);
  115 }
  116 
  117 int
  118 gdb_rx_equal(const char *str)
  119 {
  120         int len;
  121 
  122         len = strlen(str);
  123         if (len > gdb_rxsz || strncmp(str, gdb_rxp, len) != 0)
  124                 return (0);
  125         gdb_rxp += len;
  126         gdb_rxsz -= len;
  127         return (1);
  128 }
  129 
  130 int
  131 gdb_rx_mem(unsigned char *addr, size_t size)
  132 {
  133         unsigned char *p;
  134         void *prev;
  135         jmp_buf jb;
  136         size_t cnt;
  137         int ret;
  138         unsigned char c;
  139 
  140         if (size * 2 != gdb_rxsz)
  141                 return (-1);
  142 
  143         prev = kdb_jmpbuf(jb);
  144         ret = setjmp(jb);
  145         if (ret == 0) {
  146                 p = addr;
  147                 cnt = size;
  148                 while (cnt-- > 0) {
  149                         c = (C2N(gdb_rxp[0]) << 4) & 0xf0;
  150                         c |= C2N(gdb_rxp[1]) & 0x0f;
  151                         *p++ = c;
  152                         gdb_rxsz -= 2;
  153                         gdb_rxp += 2;
  154                 }
  155                 kdb_cpu_sync_icache(addr, size);
  156         }
  157         (void)kdb_jmpbuf(prev);
  158         return ((ret == 0) ? 1 : 0);
  159 }
  160 
  161 int
  162 gdb_rx_varhex(uintmax_t *vp)
  163 {
  164         uintmax_t v;
  165         int c, neg;
  166 
  167         c = gdb_rx_char();
  168         neg = (c == '-') ? 1 : 0;
  169         if (neg == 1)
  170                 c = gdb_rx_char();
  171         if (!isxdigit(c)) {
  172                 gdb_rxp -= ((c == -1) ? 0 : 1) + neg;
  173                 gdb_rxsz += ((c == -1) ? 0 : 1) + neg;
  174                 return (-1);
  175         }
  176         v = 0;
  177         do {
  178                 v <<= 4;
  179                 v += C2N(c);
  180                 c = gdb_rx_char();
  181         } while (isxdigit(c));
  182         if (c != -1) {
  183                 gdb_rxp--;
  184                 gdb_rxsz++;
  185         }
  186         *vp = (neg) ? -v : v;
  187         return (0);
  188 }
  189 
  190 /*
  191  * Function to build and send a package.
  192  */
  193 
  194 void
  195 gdb_tx_begin(char tp)
  196 {
  197 
  198         gdb_txp = gdb_txbuf;
  199         if (tp != '\0')
  200                 gdb_tx_char(tp);
  201 }
  202 
  203 int
  204 gdb_tx_end(void)
  205 {
  206         const char *p;
  207         int runlen;
  208         unsigned char c, cksum;
  209 
  210         do {
  211                 gdb_cur->gdb_putc('$');
  212 
  213                 cksum = 0;
  214                 p = gdb_txbuf;
  215                 while (p < gdb_txp) {
  216                         /* Send a character and start run-length encoding. */
  217                         c = *p++;
  218                         gdb_cur->gdb_putc(c);
  219                         cksum += c;
  220                         runlen = 0;
  221                         /* Determine run-length and update checksum. */
  222                         while (p < gdb_txp && *p == c) {
  223                                 runlen++;
  224                                 p++;
  225                         }
  226                         /* Emit the run-length encoded string. */
  227                         while (runlen >= 97) {
  228                                 gdb_cur->gdb_putc('*');
  229                                 cksum += '*';
  230                                 gdb_cur->gdb_putc(97+29);
  231                                 cksum += 97+29;
  232                                 runlen -= 97;
  233                                 if (runlen > 0) {
  234                                         gdb_cur->gdb_putc(c);
  235                                         cksum += c;
  236                                         runlen--;
  237                                 }
  238                         }
  239                         if (runlen == 1) {
  240                                 gdb_cur->gdb_putc(c);
  241                                 cksum += c;
  242                                 runlen--;
  243                         }
  244                         if (runlen == 0)
  245                                 continue;
  246                         /* Don't emit '$', '#', '+' or '-'. */
  247                         if (runlen == 7) {
  248                                 gdb_cur->gdb_putc(c);
  249                                 cksum += c;
  250                                 runlen--;
  251                         }
  252                         if (runlen == 6 || runlen == 14 || runlen == 16) {
  253                                 gdb_cur->gdb_putc(c);
  254                                 cksum += c;
  255                                 runlen--;
  256                         }
  257                         gdb_cur->gdb_putc('*');
  258                         cksum += '*';
  259                         gdb_cur->gdb_putc(runlen+29);
  260                         cksum += runlen+29;
  261                 }
  262 
  263                 gdb_cur->gdb_putc('#');
  264                 c = cksum >> 4;
  265                 gdb_cur->gdb_putc(N2C(c));
  266                 c = cksum & 0x0f;
  267                 gdb_cur->gdb_putc(N2C(c));
  268 
  269                 c = gdb_getc();
  270         } while (c != '+');
  271 
  272         return (0);
  273 }
  274 
  275 int
  276 gdb_tx_mem(const unsigned char *addr, size_t size)
  277 {
  278         void *prev;
  279         jmp_buf jb;
  280         int ret;
  281 
  282         prev = kdb_jmpbuf(jb);
  283         ret = setjmp(jb);
  284         if (ret == 0) {
  285                 while (size-- > 0) {
  286                         *gdb_txp++ = N2C(*addr >> 4);
  287                         *gdb_txp++ = N2C(*addr & 0x0f);
  288                         addr++;
  289                 }
  290         }
  291         (void)kdb_jmpbuf(prev);
  292         return ((ret == 0) ? 1 : 0);
  293 }
  294 
  295 void
  296 gdb_tx_reg(int regnum)
  297 {
  298         unsigned char *regp;
  299         size_t regsz;
  300 
  301         regp = gdb_cpu_getreg(regnum, &regsz);
  302         if (regp == NULL) {
  303                 /* Register unavailable. */
  304                 while (regsz--) {
  305                         gdb_tx_char('x');
  306                         gdb_tx_char('x');
  307                 }
  308         } else
  309                 gdb_tx_mem(regp, regsz);
  310 }

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