1 /* Remote debugging interface for Densan DVE-R3900 ROM monitor for
3 Copyright 1997 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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. */
29 #include "gdb_string.h"
32 /* Type of function passed to bfd_map_over_sections. */
34 typedef void (*section_map_func) (bfd * abfd, asection * sect, PTR obj);
36 /* Packet escape character used by Densan monitor. */
40 /* Maximum packet size. This is actually smaller than necessary
45 /* External functions. */
47 extern void report_transfer_performance (unsigned long, time_t, time_t);
49 /* Certain registers are "bitmapped", in that the monitor can only display
50 them or let the user modify them as a series of named bitfields.
51 This structure describes a field in a bitmapped register. */
55 char *prefix; /* string appearing before the value */
56 char *suffix; /* string appearing after the value */
57 char *user_name; /* name used by human when entering field value */
58 int length; /* number of bits in the field */
59 int start; /* starting (least significant) bit number of field */
62 /* Local functions for register manipulation. */
64 static void r3900_supply_register (char *regname, int regnamelen,
65 char *val, int vallen);
66 static void fetch_bad_vaddr (void);
67 static unsigned long fetch_fields (struct bit_field *bf);
68 static void fetch_bitmapped_register (int regno, struct bit_field *bf);
69 static void r3900_fetch_registers (int regno);
70 static void store_bitmapped_register (int regno, struct bit_field *bf);
71 static void r3900_store_registers (int regno);
73 /* Local functions for fast binary loading. */
75 static void write_long (char *buf, long n);
76 static void write_long_le (char *buf, long n);
77 static int debug_readchar (int hex);
78 static void debug_write (unsigned char *buf, int buflen);
79 static void ignore_packet (void);
80 static void send_packet (char type, unsigned char *buf, int buflen, int seq);
81 static void process_read_request (unsigned char *buf, int buflen);
82 static void count_section (bfd * abfd, asection * s,
83 unsigned int *section_count);
84 static void load_section (bfd * abfd, asection * s, unsigned int *data_count);
85 static void r3900_load (char *filename, int from_tty);
87 /* Miscellaneous local functions. */
89 static void r3900_open (char *args, int from_tty);
92 /* Pointers to static functions in monitor.c for fetching and storing
93 registers. We can't use these function in certain cases where the Densan
94 monitor acts perversely: for registers that it displays in bit-map
95 format, and those that can't be modified at all. In those cases
96 we have to use our own functions to fetch and store their values. */
98 static void (*orig_monitor_fetch_registers) (int regno);
99 static void (*orig_monitor_store_registers) (int regno);
101 /* Pointer to static function in monitor. for loading programs.
102 We use this function for loading S-records via the serial link. */
104 static void (*orig_monitor_load) (char *file, int from_tty);
106 /* This flag is set if a fast ethernet download should be used. */
108 static int ethernet = 0;
110 /* This array of registers needs to match the indexes used by GDB. The
111 whole reason this exists is because the various ROM monitors use
112 different names than GDB does, and don't support all the registers
115 static char *r3900_regnames[NUM_REGS] =
117 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
118 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
119 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
120 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
125 "B", /* BADVADDR_REGNUM */
126 "Pcause", /* CAUSE_REGNUM */
131 /* Table of register names produced by monitor's register dump command. */
133 static struct reg_entry
281 "BadV", BADVADDR_REGNUM
290 /* The monitor displays the cache register along with the status register,
291 as if they were a single register. So when we want to fetch the
292 status register, parse but otherwise ignore the fields of the
293 cache register that the monitor displays. Register fields that should
294 be ignored have a length of zero in the tables below. */
296 static struct bit_field status_fields[] =
298 /* Status register portion */
299 {"SR[<CU=", " ", "cu", 4, 28},
300 {"RE=", " ", "re", 1, 25},
301 {"BEV=", " ", "bev", 1, 22},
302 {"TS=", " ", "ts", 1, 21},
303 {"Nmi=", " ", "nmi", 1, 20},
304 {"INT=", " ", "int", 6, 10},
305 {"SW=", ">]", "sw", 2, 8},
306 {"[<KUO=", " ", "kuo", 1, 5},
307 {"IEO=", " ", "ieo", 1, 4},
308 {"KUP=", " ", "kup", 1, 3},
309 {"IEP=", " ", "iep", 1, 2},
310 {"KUC=", " ", "kuc", 1, 1},
311 {"IEC=", ">]", "iec", 1, 0},
313 /* Cache register portion (dummy for parsing only) */
314 {"CR[<IalO=", " ", "ialo", 0, 13},
315 {"DalO=", " ", "dalo", 0, 12},
316 {"IalP=", " ", "ialp", 0, 11},
317 {"DalP=", " ", "dalp", 0, 10},
318 {"IalC=", " ", "ialc", 0, 9},
319 {"DalC=", ">] ", "dalc", 0, 8},
321 {NULL, NULL, 0, 0} /* end of table marker */
325 #if 0 /* FIXME: Enable when we add support for modifying cache register. */
326 static struct bit_field cache_fields[] =
328 /* Status register portion (dummy for parsing only) */
329 {"SR[<CU=", " ", "cu", 0, 28},
330 {"RE=", " ", "re", 0, 25},
331 {"BEV=", " ", "bev", 0, 22},
332 {"TS=", " ", "ts", 0, 21},
333 {"Nmi=", " ", "nmi", 0, 20},
334 {"INT=", " ", "int", 0, 10},
335 {"SW=", ">]", "sw", 0, 8},
336 {"[<KUO=", " ", "kuo", 0, 5},
337 {"IEO=", " ", "ieo", 0, 4},
338 {"KUP=", " ", "kup", 0, 3},
339 {"IEP=", " ", "iep", 0, 2},
340 {"KUC=", " ", "kuc", 0, 1},
341 {"IEC=", ">]", "iec", 0, 0},
343 /* Cache register portion */
344 {"CR[<IalO=", " ", "ialo", 1, 13},
345 {"DalO=", " ", "dalo", 1, 12},
346 {"IalP=", " ", "ialp", 1, 11},
347 {"DalP=", " ", "dalp", 1, 10},
348 {"IalC=", " ", "ialc", 1, 9},
349 {"DalC=", ">] ", "dalc", 1, 8},
351 {NULL, NULL, NULL, 0, 0} /* end of table marker */
356 static struct bit_field cause_fields[] =
358 {"<BD=", " ", "bd", 1, 31},
359 {"CE=", " ", "ce", 2, 28},
360 {"IP=", " ", "ip", 6, 10},
361 {"SW=", " ", "sw", 2, 8},
362 {"EC=", ">]", "ec", 5, 2},
364 {NULL, NULL, NULL, 0, 0} /* end of table marker */
368 /* The monitor prints register values in the form
372 We look up the register name in a table, and remove the embedded space in
373 the hex value before passing it to monitor_supply_register. */
376 r3900_supply_register (regname, regnamelen, val, vallen)
387 /* Perform some sanity checks on the register name and value. */
388 if (regnamelen < 2 || regnamelen > 7 || vallen != 9)
391 /* Look up the register name. */
392 for (i = 0; reg_table[i].name != NULL; i++)
394 int rlen = strlen (reg_table[i].name);
395 if (rlen == regnamelen && strncmp (regname, reg_table[i].name, rlen) == 0)
397 regno = reg_table[i].regno;
404 /* Copy the hex value to a buffer and eliminate the embedded space. */
405 for (i = 0, p = valbuf; i < vallen; i++)
410 monitor_supply_register (regno, valbuf);
414 /* Fetch the BadVaddr register. Unlike the other registers, this
415 one can't be modified, and the monitor won't even prompt to let
423 monitor_printf ("xB\r");
424 monitor_expect ("BadV=", NULL, 0);
425 monitor_expect_prompt (buf, sizeof (buf));
426 monitor_supply_register (BADVADDR_REGNUM, buf);
430 /* Read a series of bit fields from the monitor, and return their
431 combined binary value. */
435 struct bit_field *bf;
438 unsigned long val = 0;
441 for (; bf->prefix != NULL; bf++)
443 monitor_expect (bf->prefix, NULL, 0); /* get prefix */
444 monitor_expect (bf->suffix, buf, sizeof (buf)); /* hex value, suffix */
447 bits = strtoul (buf, NULL, 16); /* get field value */
448 bits &= ((1 << bf->length) - 1); /* mask out useless bits */
449 val |= bits << bf->start; /* insert into register */
459 fetch_bitmapped_register (regno, bf)
461 struct bit_field *bf;
464 unsigned char regbuf[MAX_REGISTER_RAW_SIZE];
466 monitor_printf ("x%s\r", r3900_regnames[regno]);
467 val = fetch_fields (bf);
468 monitor_printf (".\r");
469 monitor_expect_prompt (NULL, 0);
471 /* supply register stores in target byte order, so swap here */
473 store_unsigned_integer (regbuf, REGISTER_RAW_SIZE (regno), val);
474 supply_register (regno, regbuf);
479 /* Fetch all registers (if regno is -1), or one register from the
480 monitor. For most registers, we can use the generic monitor_
481 monitor_fetch_registers function. But others are displayed in
482 a very unusual fashion by the monitor, and must be handled specially. */
485 r3900_fetch_registers (regno)
490 case BADVADDR_REGNUM:
494 fetch_bitmapped_register (PS_REGNUM, status_fields);
497 fetch_bitmapped_register (CAUSE_REGNUM, cause_fields);
500 orig_monitor_fetch_registers (regno);
505 /* Write the new value of the bitmapped register to the monitor. */
508 store_bitmapped_register (regno, bf)
510 struct bit_field *bf;
512 unsigned long oldval, newval;
514 /* Fetch the current value of the register. */
515 monitor_printf ("x%s\r", r3900_regnames[regno]);
516 oldval = fetch_fields (bf);
517 newval = read_register (regno);
519 /* To save time, write just the fields that have changed. */
520 for (; bf->prefix != NULL; bf++)
524 unsigned long oldbits, newbits, mask;
526 mask = (1 << bf->length) - 1;
527 oldbits = (oldval >> bf->start) & mask;
528 newbits = (newval >> bf->start) & mask;
529 if (oldbits != newbits)
530 monitor_printf ("%s %lx ", bf->user_name, newbits);
534 monitor_printf (".\r");
535 monitor_expect_prompt (NULL, 0);
540 r3900_store_registers (regno)
546 store_bitmapped_register (PS_REGNUM, status_fields);
549 store_bitmapped_register (CAUSE_REGNUM, cause_fields);
552 orig_monitor_store_registers (regno);
557 /* Write a 4-byte integer to the buffer in big-endian order. */
564 buf[0] = (n >> 24) & 0xff;
565 buf[1] = (n >> 16) & 0xff;
566 buf[2] = (n >> 8) & 0xff;
571 /* Write a 4-byte integer to the buffer in little-endian order. */
574 write_long_le (buf, n)
579 buf[1] = (n >> 8) & 0xff;
580 buf[2] = (n >> 16) & 0xff;
581 buf[3] = (n >> 24) & 0xff;
585 /* Read a character from the monitor. If remote debugging is on,
586 print the received character. If HEX is non-zero, print the
587 character in hexadecimal; otherwise, print it in ASCII. */
594 int c = monitor_readchar ();
596 if (remote_debug > 0)
599 sprintf (buf, "[%02x]", c & 0xff);
607 puts_debug ("Read -->", buf, "<--");
613 /* Send a buffer of characters to the monitor. If remote debugging is on,
614 print the sent buffer in hex. */
617 debug_write (buf, buflen)
623 monitor_write (buf, buflen);
625 if (remote_debug > 0)
629 sprintf (s, "[%02x]", *buf & 0xff);
630 puts_debug ("Sent -->", s, "<--");
637 /* Ignore a packet sent to us by the monitor. It send packets
638 when its console is in "communications interface" mode. A packet
641 start of packet flag (one byte: 0xdc)
642 packet type (one byte)
647 The last two bytes of the data field are a checksum, but we don't
657 /* Ignore lots of trash (messages about section addresses, for example)
658 until we see the start of a packet. */
659 for (len = 0; len < 256; len++)
661 c = debug_readchar (0);
666 error ("Packet header byte not found; %02x seen instead.", c);
668 /* Read the packet type and length. */
669 c = debug_readchar (1); /* type */
671 c = debug_readchar (1); /* low byte of length */
674 c = debug_readchar (1); /* high byte of length */
675 len += (c & 0xff) << 8;
677 /* Ignore the rest of the packet. */
679 c = debug_readchar (1);
683 /* Encapsulate some data into a packet and send it to the monitor.
685 The 'p' packet is a special case. This is a packet we send
686 in response to a read ('r') packet from the monitor. This function
687 appends a one-byte sequence number to the data field of such a packet.
691 send_packet (type, buf, buflen, seq)
696 unsigned char hdr[4];
700 /* If this is a 'p' packet, add one byte for a sequence number. */
704 /* If the buffer has a non-zero length, add two bytes for a checksum. */
708 /* Write the packet header. */
712 hdr[3] = (len >> 8) & 0xff;
713 debug_write (hdr, sizeof (hdr));
717 /* Write the packet data. */
718 debug_write (buf, buflen);
720 /* Write the sequence number if this is a 'p' packet. */
724 debug_write (hdr, 1);
727 /* Write the checksum. */
729 for (i = 0; i < buflen; i++)
731 int tmp = (buf[i] & 0xff);
742 sum += (seq & 0xff) << 8;
744 sum = (sum & 0xffff) + ((sum >> 16) & 0xffff);
745 sum += (sum >> 16) & 1;
748 hdr[0] = (sum >> 8) & 0xff;
750 debug_write (hdr, 2);
755 /* Respond to an expected read request from the monitor by sending
756 data in chunks. Handle all acknowledgements and handshaking packets.
758 The monitor expects a response consisting of a one or more 'p' packets,
759 each followed by a portion of the data requested. The 'p' packet
760 contains only a four-byte integer, the value of which is the number
761 of bytes of data we are about to send. Following the 'p' packet,
762 the monitor expects the data bytes themselves in raw, unpacketized,
763 form, without even a checksum.
767 process_read_request (buf, buflen)
771 unsigned char len[4];
775 /* Discard the read request. FIXME: we have to hope it's for
776 the exact number of bytes we want to send; should check for this. */
779 for (i = chunk = 0, seq = 0; i < buflen; i += chunk, seq++)
781 /* Don't send more than MAXPSIZE bytes at a time. */
783 if (chunk > MAXPSIZE)
786 /* Write a packet containing the number of bytes we are sending. */
787 write_long_le (len, chunk);
788 send_packet ('p', len, sizeof (len), seq);
790 /* Write the data in raw form following the packet. */
791 debug_write (&buf[i], chunk);
793 /* Discard the ACK packet. */
797 /* Send an "end of data" packet. */
798 send_packet ('e', "", 0, 0);
802 /* Count loadable sections (helper function for r3900_load). */
805 count_section (abfd, s, section_count)
808 unsigned int *section_count;
810 if (s->flags & SEC_LOAD && bfd_section_size (abfd, s) != 0)
815 /* Load a single BFD section (helper function for r3900_load).
817 WARNING: this code is filled with assumptions about how
818 the Densan monitor loads programs. The monitor issues
819 packets containing read requests, but rather than respond
820 to them in an general way, we expect them to following
823 For example, we know that the monitor will start loading by
824 issuing an 8-byte read request for the binary file header.
825 We know this is coming and ignore the actual contents
826 of the read request packet.
830 load_section (abfd, s, data_count)
833 unsigned int *data_count;
835 if (s->flags & SEC_LOAD)
837 bfd_size_type section_size = bfd_section_size (abfd, s);
838 bfd_vma section_base = bfd_section_lma (abfd, s);
839 unsigned char *buffer;
840 unsigned char header[8];
842 /* Don't output zero-length sections. */
843 if (section_size == 0)
846 *data_count += section_size;
848 /* Print some fluff about the section being loaded. */
849 printf_filtered ("Loading section %s, size 0x%lx lma ",
850 bfd_section_name (abfd, s), (long) section_size);
851 print_address_numeric (section_base, 1, gdb_stdout);
852 printf_filtered ("\n");
853 gdb_flush (gdb_stdout);
855 /* Write the section header (location and size). */
856 write_long (&header[0], (long) section_base);
857 write_long (&header[4], (long) section_size);
858 process_read_request (header, sizeof (header));
860 /* Read the section contents into a buffer, write it out,
861 then free the buffer. */
862 buffer = (unsigned char *) xmalloc (section_size);
863 bfd_get_section_contents (abfd, s, buffer, 0, section_size);
864 process_read_request (buffer, section_size);
870 /* When the ethernet is used as the console port on the Densan board,
871 we can use the "Rm" command to do a fast binary load. The format
872 of the download data is:
874 number of sections (4 bytes)
875 starting address (4 bytes)
876 repeat for each section:
877 location address (4 bytes)
878 section size (4 bytes)
881 The 4-byte fields are all in big-endian order.
883 Using this command is tricky because we have to put the monitor
884 into a special funky "communications interface" mode, in which
885 it sends and receives packets of data along with the normal prompt.
889 r3900_load (filename, from_tty)
894 unsigned int data_count = 0;
895 time_t start_time, end_time; /* for timing of download */
896 int section_count = 0;
897 unsigned char buffer[8];
899 /* If we are not using the ethernet, use the normal monitor load,
900 which sends S-records over the serial link. */
903 orig_monitor_load (filename, from_tty);
908 if (filename == NULL || filename[0] == 0)
909 filename = get_exec_file (1);
910 abfd = bfd_openr (filename, 0);
912 error ("Unable to open file %s\n", filename);
913 if (bfd_check_format (abfd, bfd_object) == 0)
914 error ("File is not an object file\n");
916 /* Output the "vconsi" command to get the monitor in the communication
917 state where it will accept a load command. This will cause
918 the monitor to emit a packet before each prompt, so ignore the packet. */
919 monitor_printf ("vconsi\r");
921 monitor_expect_prompt (NULL, 0);
923 /* Output the "Rm" (load) command and respond to the subsequent "open"
924 packet by sending an ACK packet. */
925 monitor_printf ("Rm\r");
927 send_packet ('a', "", 0, 0);
929 /* Output the fast load header (number of sections and starting address). */
930 bfd_map_over_sections ((bfd *) abfd, (section_map_func) count_section,
932 write_long (&buffer[0], (long) section_count);
934 write_long (&buffer[4], (long) bfd_get_start_address (exec_bfd));
936 write_long (&buffer[4], 0);
937 process_read_request (buffer, sizeof (buffer));
939 /* Output the section data. */
940 start_time = time (NULL);
941 bfd_map_over_sections (abfd, (section_map_func) load_section, &data_count);
942 end_time = time (NULL);
944 /* Acknowledge the close packet and put the monitor back into
945 "normal" mode so it won't send packets any more. */
947 send_packet ('a', "", 0, 0);
948 monitor_expect_prompt (NULL, 0);
949 monitor_printf ("vconsx\r");
950 monitor_expect_prompt (NULL, 0);
952 /* Print start address and download performance information. */
953 printf_filtered ("Start address 0x%lx\n", (long) bfd_get_start_address (abfd));
954 report_transfer_performance (data_count, start_time, end_time);
956 /* Finally, make the PC point at the start address */
958 write_pc (bfd_get_start_address (exec_bfd));
960 inferior_pid = 0; /* No process now */
962 /* This is necessary because many things were based on the PC at the
963 time that we attached to the monitor, which is no longer valid
964 now that we have loaded new code (and just changed the PC).
965 Another way to do this might be to call normal_stop, except that
966 the stack may not be valid, and things would get horribly
968 clear_symtab_users ();
972 /* Commands to send to the monitor when first connecting:
973 * The bare carriage return forces a prompt from the monitor
974 (monitor doesn't prompt immediately after a reset).
975 * The "vconsx" switches the monitor back to interactive mode
976 in case an aborted download had left it in packet mode.
977 * The "Xtr" command causes subsequent "t" (trace) commands to display
978 the general registers only.
979 * The "Xxr" command does the same thing for the "x" (examine
981 * The "bx" command clears all breakpoints.
984 static char *r3900_inits[] =
985 {"\r", "vconsx\r", "Xtr\r", "Xxr\r", "bx\r", NULL};
986 static char *dummy_inits[] =
989 static struct target_ops r3900_ops;
990 static struct monitor_ops r3900_cmds;
993 r3900_open (args, from_tty)
1000 monitor_open (args, &r3900_cmds, from_tty);
1002 /* We have to handle sending the init strings ourselves, because
1003 the first two strings we send (carriage returns) may not be echoed
1004 by the monitor, but the rest will be. */
1005 monitor_printf_noecho ("\r\r");
1006 for (i = 0; r3900_inits[i] != NULL; i++)
1008 monitor_printf (r3900_inits[i]);
1009 monitor_expect_prompt (NULL, 0);
1012 /* Attempt to determine whether the console device is ethernet or serial.
1013 This will tell us which kind of load to use (S-records over a serial
1014 link, or the Densan fast binary multi-section format over the net). */
1017 monitor_printf ("v\r");
1018 if (monitor_expect ("console device :", NULL, 0) != -1)
1019 if (monitor_expect ("\n", buf, sizeof (buf)) != -1)
1020 if (strstr (buf, "ethernet") != NULL)
1022 monitor_expect_prompt (NULL, 0);
1026 _initialize_r3900_rom ()
1028 r3900_cmds.flags = MO_NO_ECHO_ON_OPEN |
1029 MO_ADDR_BITS_REMOVE |
1030 MO_CLR_BREAK_USES_ADDR |
1031 MO_GETMEM_READ_SINGLE |
1032 MO_PRINT_PROGRAM_OUTPUT;
1034 r3900_cmds.init = dummy_inits;
1035 r3900_cmds.cont = "g\r";
1036 r3900_cmds.step = "t\r";
1037 r3900_cmds.set_break = "b %A\r"; /* COREADDR */
1038 r3900_cmds.clr_break = "b %A,0\r"; /* COREADDR */
1039 r3900_cmds.fill = "fx %A s %x %x\r"; /* COREADDR, len, val */
1041 r3900_cmds.setmem.cmdb = "sx %A %x\r"; /* COREADDR, val */
1042 r3900_cmds.setmem.cmdw = "sh %A %x\r"; /* COREADDR, val */
1043 r3900_cmds.setmem.cmdl = "sw %A %x\r"; /* COREADDR, val */
1045 r3900_cmds.getmem.cmdb = "sx %A\r"; /* COREADDR */
1046 r3900_cmds.getmem.cmdw = "sh %A\r"; /* COREADDR */
1047 r3900_cmds.getmem.cmdl = "sw %A\r"; /* COREADDR */
1048 r3900_cmds.getmem.resp_delim = " : ";
1049 r3900_cmds.getmem.term = " ";
1050 r3900_cmds.getmem.term_cmd = ".\r";
1052 r3900_cmds.setreg.cmd = "x%s %x\r"; /* regname, val */
1054 r3900_cmds.getreg.cmd = "x%s\r"; /* regname */
1055 r3900_cmds.getreg.resp_delim = "=";
1056 r3900_cmds.getreg.term = " ";
1057 r3900_cmds.getreg.term_cmd = ".\r";
1059 r3900_cmds.dump_registers = "x\r";
1060 r3900_cmds.register_pattern =
1061 "\\([a-zA-Z0-9_]+\\) *=\\([0-9a-f]+ [0-9a-f]+\\b\\)";
1062 r3900_cmds.supply_register = r3900_supply_register;
1063 /* S-record download, via "keyboard port". */
1064 r3900_cmds.load = "r0\r";
1065 r3900_cmds.prompt = "#";
1066 r3900_cmds.line_term = "\r";
1067 r3900_cmds.target = &r3900_ops;
1068 r3900_cmds.stopbits = SERIAL_1_STOPBITS;
1069 r3900_cmds.regnames = r3900_regnames;
1070 r3900_cmds.magic = MONITOR_OPS_MAGIC;
1072 init_monitor_ops (&r3900_ops);
1074 r3900_ops.to_shortname = "r3900";
1075 r3900_ops.to_longname = "R3900 monitor";
1076 r3900_ops.to_doc = "Debug using the DVE R3900 monitor.\n\
1077 Specify the serial device it is connected to (e.g. /dev/ttya).";
1078 r3900_ops.to_open = r3900_open;
1080 /* Override the functions to fetch and store registers. But save the
1081 addresses of the default functions, because we will use those functions
1082 for "normal" registers. */
1084 orig_monitor_fetch_registers = r3900_ops.to_fetch_registers;
1085 orig_monitor_store_registers = r3900_ops.to_store_registers;
1086 r3900_ops.to_fetch_registers = r3900_fetch_registers;
1087 r3900_ops.to_store_registers = r3900_store_registers;
1089 /* Override the load function, but save the address of the default
1090 function to use when loading S-records over a serial link. */
1091 orig_monitor_load = r3900_ops.to_load;
1092 r3900_ops.to_load = r3900_load;
1094 add_target (&r3900_ops);