gdb/dbug-rom.c

   1 /* Remote debugging interface to dBUG ROM monitor for GDB, the GNU debugger.
   2    Copyright (C) 1996-2015 Free Software Foundation, Inc.
   3
   4    Written by Stan Shebs of Cygnus Support.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* dBUG is a monitor supplied on various Motorola boards, including
  22    m68k, ColdFire, and PowerPC-based designs.  The code here assumes
  23    the ColdFire, and (as of 9/25/96) has only been tested with a
  24    ColdFire IDP board.  */
  25
  26 #include "defs.h"
  27 #include "gdbcore.h"
  28 #include "target.h"
  29 #include "monitor.h"
  30 #include "serial.h"
  31 #include "regcache.h"
  32
  33 #include "m68k-tdep.h"
  34
  35 static void
  36 dbug_supply_register (struct regcache *regcache, char *regname,
  37                       int regnamelen, char *val, int vallen)
  38 {
  39   int regno;
  40   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  41
  42   if (regnamelen != 2)
  43     return;
  44
  45   switch (regname[0])
  46     {
  47     case 'S':
  48       if (regname[1] != 'R')
  49         return;
  50       regno = gdbarch_ps_regnum (gdbarch);
  51       break;
  52     case 'P':
  53       if (regname[1] != 'C')
  54         return;
  55       regno = gdbarch_pc_regnum (gdbarch);
  56       break;
  57     case 'D':
  58       if (regname[1] < '0' || regname[1] > '7')
  59         return;
  60       regno = regname[1] - '0' + M68K_D0_REGNUM;
  61       break;
  62     case 'A':
  63       if (regname[1] < '0' || regname[1] > '7')
  64         return;
  65       regno = regname[1] - '0' + M68K_A0_REGNUM;
  66       break;
  67     default:
  68       return;
  69     }
  70
  71   monitor_supply_register (regcache, regno, val);
  72 }
  73
  74 /* This array of registers needs to match the indexes used by GDB.
  75    The whole reason this exists is because the various ROM monitors
  76    use different names than GDB does, and don't support all the
  77    registers either.  So, typing "info reg sp" becomes an "A7".  */
  78
  79 static const char *
  80 dbug_regname (int index)
  81 {
  82   static char *regnames[] =
  83   {
  84     "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",
  85     "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7",
  86     "SR", "PC"
  87     /* no float registers */
  88   };
  89
  90   if (index >= ARRAY_SIZE (regnames) || index < 0)
  91     return NULL;
  92   else
  93     return regnames[index];
  94
  95 }
  96
  97 static struct target_ops dbug_ops;
  98 static struct monitor_ops dbug_cmds;
  99
 100 static char *dbug_inits[] =
 101 {"\r", NULL};
 102
 103
 104 static void
 105 init_dbug_cmds (void)
 106 {
 107   dbug_cmds.flags = MO_CLR_BREAK_USES_ADDR
 108     | MO_GETMEM_NEEDS_RANGE | MO_FILL_USES_ADDR;
 109   dbug_cmds.init = dbug_inits;  /* Init strings */
 110   dbug_cmds.cont = "go\r";      /* continue command */
 111   dbug_cmds.step = "trace\r";   /* single step */
 112   dbug_cmds.stop = NULL;        /* interrupt command */
 113   dbug_cmds.set_break = "br %x\r";      /* set a breakpoint */
 114   dbug_cmds.clr_break = "br -r %x\r";   /* clear a breakpoint */
 115   dbug_cmds.clr_all_break = "br -r\r";  /* clear all breakpoints */
 116   dbug_cmds.fill = "bf.b %x %x %x\r";   /* fill (start end val) */
 117   dbug_cmds.setmem.cmdb = "mm.b %x %x\r";       /* setmem.cmdb (addr, value) */
 118   dbug_cmds.setmem.cmdw = "mm.w %x %x\r";       /* setmem.cmdw (addr, value) */
 119   dbug_cmds.setmem.cmdl = "mm.l %x %x\r";       /* setmem.cmdl (addr, value) */
 120   dbug_cmds.setmem.cmdll = NULL;        /* setmem.cmdll (addr, value) */
 121   dbug_cmds.setmem.resp_delim = NULL;   /* setmem.resp_delim */
 122   dbug_cmds.setmem.term = NULL; /* setmem.term */
 123   dbug_cmds.setmem.term_cmd = NULL;     /* setmem.term_cmd */
 124   dbug_cmds.getmem.cmdb = "md.b %x %x\r";       /* getmem.cmdb (addr, addr2) */
 125   dbug_cmds.getmem.cmdw = "md.w %x %x\r";       /* getmem.cmdw (addr, addr2) */
 126   dbug_cmds.getmem.cmdl = "md.l %x %x\r";       /* getmem.cmdl (addr, addr2) */
 127   dbug_cmds.getmem.cmdll = NULL;        /* getmem.cmdll (addr, addr2) */
 128   dbug_cmds.getmem.resp_delim = ":";    /* getmem.resp_delim */
 129   dbug_cmds.getmem.term = NULL; /* getmem.term */
 130   dbug_cmds.getmem.term_cmd = NULL;     /* getmem.term_cmd */
 131   dbug_cmds.setreg.cmd = "rm %s %x\r";  /* setreg.cmd (name, value) */
 132   dbug_cmds.setreg.resp_delim = NULL;   /* setreg.resp_delim */
 133   dbug_cmds.setreg.term = NULL; /* setreg.term */
 134   dbug_cmds.setreg.term_cmd = NULL;     /* setreg.term_cmd */
 135   dbug_cmds.getreg.cmd = "rd %s\r";     /* getreg.cmd (name) */
 136   dbug_cmds.getreg.resp_delim = ":";    /* getreg.resp_delim */
 137   dbug_cmds.getreg.term = NULL; /* getreg.term */
 138   dbug_cmds.getreg.term_cmd = NULL;     /* getreg.term_cmd */
 139   dbug_cmds.dump_registers = "rd\r";    /* dump_registers */
 140                                         /* register_pattern */
 141   dbug_cmds.register_pattern = "\\(\\w+\\) +:\\([0-9a-fA-F]+\\b\\)";
 142   dbug_cmds.supply_register = dbug_supply_register;
 143   dbug_cmds.load = "dl\r";      /* download command */
 144   dbug_cmds.loadresp = "\n";    /* load response */
 145   dbug_cmds.prompt = "dBUG>";   /* monitor command prompt */
 146   dbug_cmds.line_term = "\r";   /* end-of-line terminator */
 147   dbug_cmds.cmd_end = NULL;     /* optional command terminator */
 148   dbug_cmds.target = &dbug_ops; /* target operations */
 149   dbug_cmds.stopbits = SERIAL_1_STOPBITS;       /* number of stop bits */
 150   dbug_cmds.regnames = NULL;    /* registers names */
 151   dbug_cmds.regname = dbug_regname;
 152   dbug_cmds.magic = MONITOR_OPS_MAGIC;  /* magic */
 153 }                               /* init_debug_ops */
 154
 155 static void
 156 dbug_open (const char *args, int from_tty)
 157 {
 158   monitor_open (args, &dbug_cmds, from_tty);
 159 }
 160
 161 extern initialize_file_ftype _initialize_dbug_rom; /* -Wmissing-prototypes */
 162
 163 void
 164 _initialize_dbug_rom (void)
 165 {
 166   init_dbug_cmds ();
 167   init_monitor_ops (&dbug_ops);
 168
 169   dbug_ops.to_shortname = "dbug";
 170   dbug_ops.to_longname = "dBUG monitor";
 171   dbug_ops.to_doc = "Debug via the dBUG monitor.\n\
 172 Specify the serial device it is connected to (e.g. /dev/ttya).";
 173   dbug_ops.to_open = dbug_open;
 174
 175   add_target (&dbug_ops);
 176 }