summaryrefslogtreecommitdiff
path: root/gdb/rom68k-rom.c
blob: 908e7fa770faf2883d69d9fbfd94b693b50eb2a2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
/* Remote target glue for the ROM68K ROM monitor.
   Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "gdbcore.h"
#include "target.h"
#include "monitor.h"
#include "serial.h"
#include "regcache.h"
#include "value.h"

#include "m68k-tdep.h"

static void rom68k_open (char *args, int from_tty);

/* Return true if C is a hex digit.
   We can't use isxdigit here: that is affected by the current locale;
   ROM68K is not.  */
static int
is_hex_digit (int c)
{
  return (('0' <= c && c <= '9')
          || ('a' <= c && c <= 'f')
          || ('A' <= c && c <= 'F'));
}


/* Convert hex digit A to a number.  */
static int
hex_digit_value (int a)
{
  if (a >= '0' && a <= '9')
    return a - '0';
  else if (a >= 'a' && a <= 'f')
    return a - 'a' + 10;
  else if (a >= 'A' && a <= 'F')
    return a - 'A' + 10;
  else
    error (_("Invalid hex digit %d"), a);
}


/* Return true iff C is a whitespace character.
   We can't use isspace here: that is affected by the current locale;
   ROM68K is not.  */
static int
is_whitespace (int c)
{
  return (c == ' '
          || c == '\r'
          || c == '\n'
          || c == '\t'
          || c == '\f');
}


/* Parse a string of hex digits starting at HEX, supply them as the
   value of register REGNO, skip any whitespace, and return a pointer
   to the next character.

   There is a function in monitor.c, monitor_supply_register, which is
   supposed to do this job.  However, there is some rather odd stuff
   in there (whitespace characters don't terminate numbers, for
   example) that is incorrect for ROM68k.  It's basically impossible
   to safely tweak monitor_supply_register --- it's used by a zillion
   other monitors; who knows what behaviors they're depending on.  So
   instead, we'll just use our own function, which can behave exactly
   the way we want it to.  */
static char *
rom68k_supply_one_register (int regno, unsigned char *hex)
{
  ULONGEST value;
  unsigned char regbuf[MAX_REGISTER_SIZE];

  value = 0;
  while (*hex != '\0')
    if (is_hex_digit (*hex))
      value = (value * 16) + hex_digit_value (*hex++);
    else
      break;

  /* Skip any whitespace.  */
  while (is_whitespace (*hex))
    hex++;

  store_unsigned_integer (regbuf, register_size (current_gdbarch, regno), value);
  regcache_raw_supply (current_regcache, regno, regbuf);

  return hex;
}


static void
rom68k_supply_register (char *regname, int regnamelen, char *val, int vallen)
{
  int numregs;
  int regno;

  numregs = 1;
  regno = -1;

  if (regnamelen == 2)
    switch (regname[0])
      {
      case 'S':
	if (regname[1] == 'R')
	  regno = PS_REGNUM;
	break;
      case 'P':
	if (regname[1] == 'C')
	  regno = PC_REGNUM;
	break;
      case 'D':
	if (regname[1] != 'R')
	  break;
	regno = M68K_D0_REGNUM;
	numregs = 8;
	break;
      case 'A':
	if (regname[1] != 'R')
	  break;
	regno = M68K_A0_REGNUM;
	numregs = 7;
	break;
      }
  else if (regnamelen == 3)
    switch (regname[0])
      {
      case 'I':
	if (regname[1] == 'S' && regname[2] == 'P')
	  regno = SP_REGNUM;
      }

  if (regno >= 0)
    while (numregs-- > 0)
      val = rom68k_supply_one_register (regno++, val);
}

/* This array of registers need to match the indexes used by GDB.
   This exists because the various ROM monitors use different strings
   than does GDB, and don't necessarily support all the registers
   either. So, typing "info reg sp" becomes a "r30".  */

static const char *
rom68k_regname (int index) 
{

  static char *regnames[] =
  {
    "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
    "A0", "A1", "A2", "A3", "A4", "A5", "A6", "ISP",
    "SR", "PC"
  };
  
  if ((index >= (sizeof (regnames) / sizeof(regnames[0]))) 
       || (index < 0) || (index >= NUM_REGS))
    return NULL;
  else
    return regnames[index];

}

/* Define the monitor command strings. Since these are passed directly
   through to a printf style function, we may include formatting
   strings. We also need a CR or LF on the end.  */

static struct target_ops rom68k_ops;

static char *rom68k_inits[] =
{".\r\r", NULL};		/* Exits pm/pr & download cmds */

static struct monitor_ops rom68k_cmds;

static void
init_rom68k_cmds (void)
{
  rom68k_cmds.flags = MO_PRINT_PROGRAM_OUTPUT;
  rom68k_cmds.init = rom68k_inits;	/* monitor init string */
  rom68k_cmds.cont = "go\r";
  rom68k_cmds.step = "st\r";
  rom68k_cmds.stop = NULL;
  rom68k_cmds.set_break = "db %x\r";
  rom68k_cmds.clr_break = "cb %x\r";
  rom68k_cmds.clr_all_break = "cb *\r";
  rom68k_cmds.fill = "fm %x %x %x\r";
  rom68k_cmds.setmem.cmdb = "pm %x %x\r";
  rom68k_cmds.setmem.cmdw = "pm.w %x %x\r";
  rom68k_cmds.setmem.cmdl = "pm.l %x %x\r";
  rom68k_cmds.setmem.cmdll = NULL;
  rom68k_cmds.setmem.resp_delim = NULL;
  rom68k_cmds.setmem.term = NULL;
  rom68k_cmds.setmem.term_cmd = NULL;
  rom68k_cmds.getmem.cmdb = "dm %x %x\r";
  rom68k_cmds.getmem.cmdw = "dm.w %x %x\r";
  rom68k_cmds.getmem.cmdl = "dm.l %x %x\r";
  rom68k_cmds.getmem.cmdll = NULL;
  rom68k_cmds.getmem.resp_delim = "  ";
  rom68k_cmds.getmem.term = NULL;
  rom68k_cmds.getmem.term_cmd = NULL;
  rom68k_cmds.setreg.cmd = "pr %s %x\r";
  rom68k_cmds.setreg.resp_delim = NULL;
  rom68k_cmds.setreg.term = NULL;
  rom68k_cmds.setreg.term_cmd = NULL;
  rom68k_cmds.getreg.cmd = "pr %s\r";
  rom68k_cmds.getreg.resp_delim = ":  ";
  rom68k_cmds.getreg.term = "= ";
  rom68k_cmds.getreg.term_cmd = ".\r";
  rom68k_cmds.dump_registers = "dr\r";
  rom68k_cmds.register_pattern =
    "\\(\\w+\\)=\\([0-9a-fA-F]+\\( +[0-9a-fA-F]+\\b\\)*\\)";
  rom68k_cmds.supply_register = rom68k_supply_register;
  rom68k_cmds.load_routine = NULL;
  rom68k_cmds.load = "dc\r";
  rom68k_cmds.loadresp = "Waiting for S-records from host... ";
  rom68k_cmds.prompt = "ROM68K :-> ";
  rom68k_cmds.line_term = "\r";
  rom68k_cmds.cmd_end = ".\r";
  rom68k_cmds.target = &rom68k_ops;
  rom68k_cmds.stopbits = SERIAL_1_STOPBITS;
  rom68k_cmds.regnames = NULL;
  rom68k_cmds.regname = rom68k_regname;
  rom68k_cmds.magic = MONITOR_OPS_MAGIC;
}				/* init_rom68k_cmds */

static void
rom68k_open (char *args, int from_tty)
{
  monitor_open (args, &rom68k_cmds, from_tty);
}

extern initialize_file_ftype _initialize_rom68k; /* -Wmissing-prototypes */

void
_initialize_rom68k (void)
{
  init_rom68k_cmds ();
  init_monitor_ops (&rom68k_ops);

  rom68k_ops.to_shortname = "rom68k";
  rom68k_ops.to_longname = "Rom68k debug monitor for the IDP Eval board";
  rom68k_ops.to_doc = "Debug on a Motorola IDP eval board running the ROM68K monitor.\n\
Specify the serial device it is connected to (e.g. /dev/ttya).";
  rom68k_ops.to_open = rom68k_open;

  add_target (&rom68k_ops);
}