gdb/rom68k-rom.c

   1 /* Remote target glue for the ROM68K ROM monitor.
   2    Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "target.h"
  25 #include "monitor.h"
  26 #include "serial.h"
  27 #include "regcache.h"
  28 #include "value.h"
  29
  30 static void rom68k_open (char *args, int from_tty);
  31
  32 /* Return true if C is a hex digit.
  33    We can't use isxdigit here: that is affected by the current locale;
  34    ROM68K is not.  */
  35 static int
  36 is_hex_digit (int c)
  37 {
  38   return (('0' <= c && c <= '9')
  39           || ('a' <= c && c <= 'f')
  40           || ('A' <= c && c <= 'F'));
  41 }
  42
  43
  44 /* Convert hex digit A to a number.  */
  45 static int
  46 hex_digit_value (int a)
  47 {
  48   if (a >= '0' && a <= '9')
  49     return a - '0';
  50   else if (a >= 'a' && a <= 'f')
  51     return a - 'a' + 10;
  52   else if (a >= 'A' && a <= 'F')
  53     return a - 'A' + 10;
  54   else
  55     error ("Invalid hex digit %d", a);
  56 }
  57
  58
  59 /* Return true iff C is a whitespace character.
  60    We can't use isspace here: that is affected by the current locale;
  61    ROM68K is not.  */
  62 static int
  63 is_whitespace (int c)
  64 {
  65   return (c == ' '
  66           || c == '\r'
  67           || c == '\n'
  68           || c == '\t'
  69           || c == '\f');
  70 }
  71
  72
  73 /* Parse a string of hex digits starting at HEX, supply them as the
  74    value of register REGNO, skip any whitespace, and return a pointer
  75    to the next character.
  76
  77    There is a function in monitor.c, monitor_supply_register, which is
  78    supposed to do this job.  However, there is some rather odd stuff
  79    in there (whitespace characters don't terminate numbers, for
  80    example) that is incorrect for ROM68k.  It's basically impossible
  81    to safely tweak monitor_supply_register --- it's used by a zillion
  82    other monitors; who knows what behaviors they're depending on.  So
  83    instead, we'll just use our own function, which can behave exactly
  84    the way we want it to.  */
  85 static char *
  86 rom68k_supply_one_register (int regno, unsigned char *hex)
  87 {
  88   ULONGEST value;
  89   unsigned char regbuf[MAX_REGISTER_RAW_SIZE];
  90
  91   value = 0;
  92   while (*hex != '\0')
  93     if (is_hex_digit (*hex))
  94       value = (value * 16) + hex_digit_value (*hex++);
  95     else
  96       break;
  97
  98   /* Skip any whitespace.  */
  99   while (is_whitespace (*hex))
 100     hex++;
 101
 102   store_unsigned_integer (regbuf, REGISTER_RAW_SIZE (regno), value);
 103   supply_register (regno, regbuf);
 104
 105   return hex;
 106 }
 107
 108
 109 static void
 110 rom68k_supply_register (char *regname, int regnamelen, char *val, int vallen)
 111 {
 112   int numregs;
 113   int regno;
 114
 115   numregs = 1;
 116   regno = -1;
 117
 118   if (regnamelen == 2)
 119     switch (regname[0])
 120       {
 121       case 'S':
 122         if (regname[1] == 'R')
 123           regno = PS_REGNUM;
 124         break;
 125       case 'P':
 126         if (regname[1] == 'C')
 127           regno = PC_REGNUM;
 128         break;
 129       case 'D':
 130         if (regname[1] != 'R')
 131           break;
 132         regno = D0_REGNUM;
 133         numregs = 8;
 134         break;
 135       case 'A':
 136         if (regname[1] != 'R')
 137           break;
 138         regno = A0_REGNUM;
 139         numregs = 7;
 140         break;
 141       }
 142   else if (regnamelen == 3)
 143     switch (regname[0])
 144       {
 145       case 'I':
 146         if (regname[1] == 'S' && regname[2] == 'P')
 147           regno = SP_REGNUM;
 148       }
 149
 150   if (regno >= 0)
 151     while (numregs-- > 0)
 152       val = rom68k_supply_one_register (regno++, val);
 153 }
 154
 155 /* This array of registers need to match the indexes used by GDB.
 156    This exists because the various ROM monitors use different strings
 157    than does GDB, and don't necessarily support all the registers
 158    either. So, typing "info reg sp" becomes a "r30".  */
 159
 160 static const char *
 161 rom68k_regname (int index)
 162 {
 163
 164   static char *regnames[] =
 165   {
 166     "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
 167     "A0", "A1", "A2", "A3", "A4", "A5", "A6", "ISP",
 168     "SR", "PC"
 169   };
 170
 171   if ((index >= (sizeof (regnames) / sizeof(regnames[0])))
 172        || (index < 0) || (index >= NUM_REGS))
 173     return NULL;
 174   else
 175     return regnames[index];
 176
 177 }
 178
 179 /* Define the monitor command strings. Since these are passed directly
 180    through to a printf style function, we may include formatting
 181    strings. We also need a CR or LF on the end.  */
 182
 183 static struct target_ops rom68k_ops;
 184
 185 static char *rom68k_inits[] =
 186 {".\r\r", NULL};                /* Exits pm/pr & download cmds */
 187
 188 static struct monitor_ops rom68k_cmds;
 189
 190 static void
 191 init_rom68k_cmds (void)
 192 {
 193   rom68k_cmds.flags = MO_PRINT_PROGRAM_OUTPUT;
 194   rom68k_cmds.init = rom68k_inits;      /* monitor init string */
 195   rom68k_cmds.cont = "go\r";
 196   rom68k_cmds.step = "st\r";
 197   rom68k_cmds.stop = NULL;
 198   rom68k_cmds.set_break = "db %x\r";
 199   rom68k_cmds.clr_break = "cb %x\r";
 200   rom68k_cmds.clr_all_break = "cb *\r";
 201   rom68k_cmds.fill = "fm %x %x %x\r";
 202   rom68k_cmds.setmem.cmdb = "pm %x %x\r";
 203   rom68k_cmds.setmem.cmdw = "pm.w %x %x\r";
 204   rom68k_cmds.setmem.cmdl = "pm.l %x %x\r";
 205   rom68k_cmds.setmem.cmdll = NULL;
 206   rom68k_cmds.setmem.resp_delim = NULL;
 207   rom68k_cmds.setmem.term = NULL;
 208   rom68k_cmds.setmem.term_cmd = NULL;
 209   rom68k_cmds.getmem.cmdb = "dm %x %x\r";
 210   rom68k_cmds.getmem.cmdw = "dm.w %x %x\r";
 211   rom68k_cmds.getmem.cmdl = "dm.l %x %x\r";
 212   rom68k_cmds.getmem.cmdll = NULL;
 213   rom68k_cmds.getmem.resp_delim = "  ";
 214   rom68k_cmds.getmem.term = NULL;
 215   rom68k_cmds.getmem.term_cmd = NULL;
 216   rom68k_cmds.setreg.cmd = "pr %s %x\r";
 217   rom68k_cmds.setreg.resp_delim = NULL;
 218   rom68k_cmds.setreg.term = NULL;
 219   rom68k_cmds.setreg.term_cmd = NULL;
 220   rom68k_cmds.getreg.cmd = "pr %s\r";
 221   rom68k_cmds.getreg.resp_delim = ":  ";
 222   rom68k_cmds.getreg.term = "= ";
 223   rom68k_cmds.getreg.term_cmd = ".\r";
 224   rom68k_cmds.dump_registers = "dr\r";
 225   rom68k_cmds.register_pattern =
 226     "\\(\\w+\\)=\\([0-9a-fA-F]+\\( +[0-9a-fA-F]+\\b\\)*\\)";
 227   rom68k_cmds.supply_register = rom68k_supply_register;
 228   rom68k_cmds.load_routine = NULL;
 229   rom68k_cmds.load = "dc\r";
 230   rom68k_cmds.loadresp = "Waiting for S-records from host... ";
 231   rom68k_cmds.prompt = "ROM68K :-> ";
 232   rom68k_cmds.line_term = "\r";
 233   rom68k_cmds.cmd_end = ".\r";
 234   rom68k_cmds.target = &rom68k_ops;
 235   rom68k_cmds.stopbits = SERIAL_1_STOPBITS;
 236   rom68k_cmds.regnames = NULL;
 237   rom68k_cmds.regname = rom68k_regname;
 238   rom68k_cmds.magic = MONITOR_OPS_MAGIC;
 239 }                               /* init_rom68k_cmds */
 240
 241 static void
 242 rom68k_open (char *args, int from_tty)
 243 {
 244   monitor_open (args, &rom68k_cmds, from_tty);
 245 }
 246
 247 void
 248 _initialize_rom68k (void)
 249 {
 250   init_rom68k_cmds ();
 251   init_monitor_ops (&rom68k_ops);
 252
 253   rom68k_ops.to_shortname = "rom68k";
 254   rom68k_ops.to_longname = "Rom68k debug monitor for the IDP Eval board";
 255   rom68k_ops.to_doc = "Debug on a Motorola IDP eval board running the ROM68K monitor.\n\
 256 Specify the serial device it is connected to (e.g. /dev/ttya).";
 257   rom68k_ops.to_open = rom68k_open;
 258
 259   add_target (&rom68k_ops);
 260 }