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Diffstat (limited to 'gdb/dve3900-rom.c')
| -rw-r--r-- | gdb/dve3900-rom.c | 962 |
1 files changed, 962 insertions, 0 deletions
diff --git a/gdb/dve3900-rom.c b/gdb/dve3900-rom.c new file mode 100644 index 0000000..c76da77 --- /dev/null +++ b/gdb/dve3900-rom.c @@ -0,0 +1,962 @@ +/* Remote debugging interface for Densan DVE-R3900 ROM monitor for + GDB, the GNU debugger. + Copyright 1997 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 "inferior.h" +#include "command.h" +#include "gdb_string.h" +#include <time.h> + +/* Type of function passed to bfd_map_over_sections. */ + +typedef void (*section_map_func) PARAMS ((bfd *abfd, asection *sect, PTR obj)); + +/* Packet escape character used by Densan monitor. */ + +#define PESC 0xdc + +/* Maximum packet size. This is actually smaller than necessary + just to be safe. */ + +#define MAXPSIZE 1024 + +/* External functions. */ + +extern void report_transfer_performance PARAMS ((unsigned long, + time_t, time_t)); + +/* Certain registers are "bitmapped", in that the monitor can only display + them or let the user modify them as a series of named bitfields. + This structure describes a field in a bitmapped register. */ + +struct bit_field +{ + char *prefix; /* string appearing before the value */ + char *suffix; /* string appearing after the value */ + char *user_name; /* name used by human when entering field value */ + int length; /* number of bits in the field */ + int start; /* starting (least significant) bit number of field */ +}; + +/* Local functions for register manipulation. */ + +static void r3900_supply_register PARAMS ((char *regname, int regnamelen, + char *val, int vallen)); +static void fetch_bad_vaddr PARAMS ((void)); +static unsigned long fetch_fields PARAMS ((struct bit_field *bf)); +static void fetch_bitmapped_register PARAMS ((int regno, + struct bit_field *bf)); +static void r3900_fetch_registers PARAMS ((int regno)); +static void store_bitmapped_register PARAMS ((int regno, + struct bit_field *bf)); +static void r3900_store_registers PARAMS ((int regno)); + +/* Local functions for fast binary loading. */ + +static void write_long PARAMS ((char *buf, long n)); +static void write_long_le PARAMS ((char *buf, long n)); +static int debug_readchar PARAMS ((int hex)); +static void debug_write PARAMS ((unsigned char *buf, int buflen)); +static void ignore_packet PARAMS ((void)); +static void send_packet PARAMS ((char type, unsigned char *buf, int buflen, + int seq)); +static void process_read_request PARAMS ((unsigned char *buf, int buflen)); +static void count_section PARAMS ((bfd *abfd, asection *s, + unsigned int *section_count)); +static void load_section PARAMS ((bfd *abfd, asection *s, + unsigned int *data_count)); +static void r3900_load PARAMS ((char *filename, int from_tty)); + +/* Miscellaneous local functions. */ + +static void r3900_open PARAMS ((char *args, int from_tty)); + + +/* Pointers to static functions in monitor.c for fetching and storing + registers. We can't use these function in certain cases where the Densan + monitor acts perversely: for registers that it displays in bit-map + format, and those that can't be modified at all. In those cases + we have to use our own functions to fetch and store their values. */ + +static void (*orig_monitor_fetch_registers) PARAMS ((int regno)); +static void (*orig_monitor_store_registers) PARAMS ((int regno)); + +/* Pointer to static function in monitor. for loading programs. + We use this function for loading S-records via the serial link. */ + +static void (*orig_monitor_load) PARAMS ((char *file, int from_tty)); + +/* This flag is set if a fast ethernet download should be used. */ + +static int ethernet = 0; + +/* This array of registers needs to match the indexes used by GDB. The + whole reason this exists is because the various ROM monitors use + different names than GDB does, and don't support all the registers + either. */ + +static char *r3900_regnames[NUM_REGS] = +{ + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", + "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", + "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", + "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", + + "S", /* PS_REGNUM */ + "l", /* LO_REGNUM */ + "h", /* HI_REGNUM */ + "B", /* BADVADDR_REGNUM */ + "Pcause", /* CAUSE_REGNUM */ + "p" /* PC_REGNUM */ +}; + + +/* Table of register names produced by monitor's register dump command. */ + +static struct reg_entry +{ + char *name; + int regno; +} reg_table[] = +{ + { "r0_zero", 0 }, { "r1_at", 1 }, { "r2_v0", 2 }, { "r3_v1", 3 }, + { "r4_a0", 4 }, { "r5_a1", 5 }, { "r6_a2", 6 }, { "r7_a3", 7 }, + { "r8_t0", 8 }, { "r9_t1", 9 }, { "r10_t2", 10 }, { "r11_t3", 11 }, + { "r12_t4", 12 }, { "r13_t5", 13 }, { "r14_t6", 14 }, { "r15_t7", 15 }, + { "r16_s0", 16 }, { "r17_s1", 17 }, { "r18_s2", 18 }, { "r19_s3", 19 }, + { "r20_s4", 20 }, { "r21_s5", 21 }, { "r22_s6", 22 }, { "r23_s7", 23 }, + { "r24_t8", 24 }, { "r25_t9", 25 }, { "r26_k0", 26 }, { "r27_k1", 27 }, + { "r28_gp", 28 }, { "r29_sp", 29 }, { "r30_fp", 30 }, { "r31_ra", 31 }, + { "HI", HI_REGNUM }, + { "LO", LO_REGNUM }, + { "PC", PC_REGNUM }, + { "BadV", BADVADDR_REGNUM }, + { NULL, 0 } +}; + + +/* The monitor displays the cache register along with the status register, + as if they were a single register. So when we want to fetch the + status register, parse but otherwise ignore the fields of the + cache register that the monitor displays. Register fields that should + be ignored have a length of zero in the tables below. */ + +static struct bit_field status_fields [] = +{ + /* Status register portion */ + { "SR[<CU=", " ", "cu", 4, 28 }, + { "RE=", " ", "re", 1, 25 }, + { "BEV=", " ", "bev", 1, 22 }, + { "TS=", " ", "ts", 1, 21 }, + { "Nmi=", " ", "nmi", 1, 20 }, + { "INT=", " ", "int", 6, 10 }, + { "SW=", ">]", "sw", 2, 8 }, + { "[<KUO=", " ", "kuo", 1, 5 }, + { "IEO=", " ", "ieo", 1, 4 }, + { "KUP=", " ", "kup", 1, 3 }, + { "IEP=", " ", "iep", 1, 2 }, + { "KUC=", " ", "kuc", 1, 1 }, + { "IEC=", ">]", "iec", 1, 0 }, + + /* Cache register portion (dummy for parsing only) */ + { "CR[<IalO="," ", "ialo", 0, 13 }, + { "DalO=", " ", "dalo", 0, 12 }, + { "IalP=", " ", "ialp", 0, 11 }, + { "DalP=", " ", "dalp", 0, 10 }, + { "IalC=", " ", "ialc", 0, 9 }, + { "DalC=", ">] ", "dalc", 0, 8 }, + + { NULL, NULL, 0, 0 } /* end of table marker */ +}; + + +#if 0 /* FIXME: Enable when we add support for modifying cache register. */ +static struct bit_field cache_fields [] = +{ + /* Status register portion (dummy for parsing only) */ + { "SR[<CU=", " ", "cu", 0, 28 }, + { "RE=", " ", "re", 0, 25 }, + { "BEV=", " ", "bev", 0, 22 }, + { "TS=", " ", "ts", 0, 21 }, + { "Nmi=", " ", "nmi", 0, 20 }, + { "INT=", " ", "int", 0, 10 }, + { "SW=", ">]", "sw", 0, 8 }, + { "[<KUO=", " ", "kuo", 0, 5 }, + { "IEO=", " ", "ieo", 0, 4 }, + { "KUP=", " ", "kup", 0, 3 }, + { "IEP=", " ", "iep", 0, 2 }, + { "KUC=", " ", "kuc", 0, 1 }, + { "IEC=", ">]", "iec", 0, 0 }, + + /* Cache register portion */ + { "CR[<IalO="," ", "ialo", 1, 13 }, + { "DalO=", " ", "dalo", 1, 12 }, + { "IalP=", " ", "ialp", 1, 11 }, + { "DalP=", " ", "dalp", 1, 10 }, + { "IalC=", " ", "ialc", 1, 9 }, + { "DalC=", ">] ", "dalc", 1, 8 }, + + { NULL, NULL, NULL, 0, 0 } /* end of table marker */ +}; +#endif + + +static struct bit_field cause_fields[] = +{ + { "<BD=", " ", "bd", 1, 31 }, + { "CE=", " ", "ce", 2, 28 }, + { "IP=", " ", "ip", 6, 10 }, + { "SW=", " ", "sw", 2, 8 }, + { "EC=", ">]" , "ec", 5, 2 }, + + { NULL, NULL, NULL, 0, 0 } /* end of table marker */ +}; + + +/* The monitor prints register values in the form + + regname = xxxx xxxx + + We look up the register name in a table, and remove the embedded space in + the hex value before passing it to monitor_supply_register. */ + +static void +r3900_supply_register (regname, regnamelen, val, vallen) + char *regname; + int regnamelen; + char *val; + int vallen; +{ + int regno = -1; + int i; + char valbuf[10]; + char *p; + + /* Perform some sanity checks on the register name and value. */ + if (regnamelen < 2 || regnamelen > 7 || vallen != 9) + return; + + /* Look up the register name. */ + for (i = 0; reg_table[i].name != NULL; i++) + { + int rlen = strlen (reg_table[i].name); + if (rlen == regnamelen && strncmp (regname, reg_table[i].name, rlen) == 0) + { + regno = reg_table[i].regno; + break; + } + } + if (regno == -1) + return; + + /* Copy the hex value to a buffer and eliminate the embedded space. */ + for (i = 0, p = valbuf; i < vallen; i++) + if (val[i] != ' ') + *p++ = val[i]; + *p = '\0'; + + monitor_supply_register (regno, valbuf); +} + + +/* Fetch the BadVaddr register. Unlike the other registers, this + one can't be modified, and the monitor won't even prompt to let + you modify it. */ + +static void +fetch_bad_vaddr() +{ + char buf[20]; + + monitor_printf ("xB\r"); + monitor_expect ("BadV=", NULL, 0); + monitor_expect_prompt (buf, sizeof(buf)); + monitor_supply_register (BADVADDR_REGNUM, buf); +} + + +/* Read a series of bit fields from the monitor, and return their + combined binary value. */ + +static unsigned long +fetch_fields (bf) + struct bit_field *bf; +{ + char buf[20]; + unsigned long val = 0; + unsigned long bits; + + for ( ; bf->prefix != NULL; bf++) + { + monitor_expect (bf->prefix, NULL, 0); /* get prefix */ + monitor_expect (bf->suffix, buf, sizeof (buf)); /* hex value, suffix */ + if (bf->length != 0) + { + bits = strtoul (buf, NULL, 16); /* get field value */ + bits &= ((1 << bf->length) - 1); /* mask out useless bits */ + val |= bits << bf->start; /* insert into register */ + } + + } + + return val; +} + + +static void +fetch_bitmapped_register (regno, bf) + int regno; + struct bit_field *bf; +{ + unsigned long val; + unsigned char regbuf[MAX_REGISTER_RAW_SIZE]; + + monitor_printf ("x%s\r", r3900_regnames[regno]); + val = fetch_fields (bf); + monitor_printf (".\r"); + monitor_expect_prompt (NULL, 0); + + /* supply register stores in target byte order, so swap here */ + + store_unsigned_integer (regbuf, REGISTER_RAW_SIZE (regno), val); + supply_register (regno, regbuf); + +} + + +/* Fetch all registers (if regno is -1), or one register from the + monitor. For most registers, we can use the generic monitor_ + monitor_fetch_registers function. But others are displayed in + a very unusual fashion by the monitor, and must be handled specially. */ + +static void +r3900_fetch_registers (regno) + int regno; +{ + switch (regno) + { + case BADVADDR_REGNUM: + fetch_bad_vaddr (); + return; + case PS_REGNUM: + fetch_bitmapped_register (PS_REGNUM, status_fields); + return; + case CAUSE_REGNUM: + fetch_bitmapped_register (CAUSE_REGNUM, cause_fields); + return; + default: + orig_monitor_fetch_registers (regno); + } +} + + +/* Write the new value of the bitmapped register to the monitor. */ + +static void +store_bitmapped_register (regno, bf) + int regno; + struct bit_field *bf; +{ + unsigned long oldval, newval; + + /* Fetch the current value of the register. */ + monitor_printf ("x%s\r", r3900_regnames[regno]); + oldval = fetch_fields (bf); + newval = read_register (regno); + + /* To save time, write just the fields that have changed. */ + for ( ; bf->prefix != NULL; bf++) + { + if (bf->length != 0) + { + unsigned long oldbits, newbits, mask; + + mask = (1 << bf->length) - 1; + oldbits = (oldval >> bf->start) & mask; + newbits = (newval >> bf->start) & mask; + if (oldbits != newbits) + monitor_printf ("%s %x ", bf->user_name, newbits); + } + } + + monitor_printf (".\r"); + monitor_expect_prompt (NULL, 0); +} + + +static void +r3900_store_registers (regno) + int regno; +{ + switch (regno) + { + case PS_REGNUM: + store_bitmapped_register (PS_REGNUM, status_fields); + return; + case CAUSE_REGNUM: + store_bitmapped_register (CAUSE_REGNUM, cause_fields); + return; + default: + orig_monitor_store_registers (regno); + } +} + + +/* Write a 4-byte integer to the buffer in big-endian order. */ + +static void +write_long (buf, n) + char *buf; + long n; +{ + buf[0] = (n >> 24) & 0xff; + buf[1] = (n >> 16) & 0xff; + buf[2] = (n >> 8) & 0xff; + buf[3] = n & 0xff; +} + + +/* Write a 4-byte integer to the buffer in little-endian order. */ + +static void +write_long_le (buf, n) + char *buf; + long n; +{ + buf[0] = n & 0xff; + buf[1] = (n >> 8) & 0xff; + buf[2] = (n >> 16) & 0xff; + buf[3] = (n >> 24) & 0xff; +} + + +/* Read a character from the monitor. If remote debugging is on, + print the received character. If HEX is non-zero, print the + character in hexadecimal; otherwise, print it in ASCII. */ + +static int +debug_readchar (hex) + int hex; +{ + char buf [10]; + int c = monitor_readchar (); + + if (remote_debug > 0) + { + if (hex) + sprintf (buf, "[%02x]", c & 0xff); + else if (c == '\0') + strcpy (buf, "\\0"); + else + { + buf[0] = c; + buf[1] = '\0'; + } + puts_debug ("Read -->", buf, "<--"); + } + return c; +} + + +/* Send a buffer of characters to the monitor. If remote debugging is on, + print the sent buffer in hex. */ + +static void +debug_write (buf, buflen) + unsigned char *buf; + int buflen; +{ + char s[10]; + + monitor_write (buf, buflen); + + if (remote_debug > 0) + { + while (buflen-- > 0) + { + sprintf (s, "[%02x]", *buf & 0xff); + puts_debug ("Sent -->", s, "<--"); + buf++; + } + } +} + + +/* Ignore a packet sent to us by the monitor. It send packets + when its console is in "communications interface" mode. A packet + is of this form: + + start of packet flag (one byte: 0xdc) + packet type (one byte) + length (low byte) + length (high byte) + data (length bytes) + + The last two bytes of the data field are a checksum, but we don't + bother to verify it. +*/ + +static void +ignore_packet () +{ + int c; + int len; + + /* Ignore lots of trash (messages about section addresses, for example) + until we see the start of a packet. */ + for (len = 0; len < 256; len++) + { + c = debug_readchar (0); + if (c == PESC) + break; + } + if (len == 8) + error ("Packet header byte not found; %02x seen instead.", c); + + /* Read the packet type and length. */ + c = debug_readchar (1); /* type */ + + c = debug_readchar (1); /* low byte of length */ + len = c & 0xff; + + c = debug_readchar (1); /* high byte of length */ + len += (c & 0xff) << 8; + + /* Ignore the rest of the packet. */ + while (len-- > 0) + c = debug_readchar (1); +} + + +/* Encapsulate some data into a packet and send it to the monitor. + + The 'p' packet is a special case. This is a packet we send + in response to a read ('r') packet from the monitor. This function + appends a one-byte sequence number to the data field of such a packet. +*/ + +static void +send_packet (type, buf, buflen, seq) + char type; + unsigned char *buf; + int buflen, seq; +{ + unsigned char hdr[4]; + int len = buflen; + int sum, i; + + /* If this is a 'p' packet, add one byte for a sequence number. */ + if (type == 'p') + len++; + + /* If the buffer has a non-zero length, add two bytes for a checksum. */ + if (len > 0) + len += 2; + + /* Write the packet header. */ + hdr[0] = PESC; + hdr[1] = type; + hdr[2] = len & 0xff; + hdr[3] = (len >> 8) & 0xff; + debug_write (hdr, sizeof (hdr)); + + if (len) + { + /* Write the packet data. */ + debug_write (buf, buflen); + + /* Write the sequence number if this is a 'p' packet. */ + if (type == 'p') + { + hdr[0] = seq; + debug_write (hdr, 1); + } + + /* Write the checksum. */ + sum = 0; + for (i = 0; i < buflen; i++) + { + int tmp = (buf[i] & 0xff); + if (i & 1) + sum += tmp; + else + sum += tmp << 8; + } + if (type == 'p') + { + if (buflen & 1) + sum += (seq & 0xff); + else + sum += (seq & 0xff) << 8; + } + sum = (sum & 0xffff) + ((sum >> 16) & 0xffff); + sum += (sum >> 16) & 1; + sum = ~sum; + + hdr[0] = (sum >> 8) & 0xff; + hdr[1] = sum & 0xff; + debug_write (hdr, 2); + } +} + + +/* Respond to an expected read request from the monitor by sending + data in chunks. Handle all acknowledgements and handshaking packets. + + The monitor expects a response consisting of a one or more 'p' packets, + each followed by a portion of the data requested. The 'p' packet + contains only a four-byte integer, the value of which is the number + of bytes of data we are about to send. Following the 'p' packet, + the monitor expects the data bytes themselves in raw, unpacketized, + form, without even a checksum. + */ + +static void +process_read_request (buf, buflen) + unsigned char *buf; + int buflen; +{ + unsigned char len[4]; + int i, chunk; + unsigned char seq; + + /* Discard the read request. FIXME: we have to hope it's for + the exact number of bytes we want to send; should check for this. */ + ignore_packet (); + + for (i = chunk = 0, seq = 0; i < buflen; i += chunk, seq++) + { + /* Don't send more than MAXPSIZE bytes at a time. */ + chunk = buflen - i; + if (chunk > MAXPSIZE) + chunk = MAXPSIZE; + + /* Write a packet containing the number of bytes we are sending. */ + write_long_le (len, chunk); + send_packet ('p', len, sizeof (len), seq); + + /* Write the data in raw form following the packet. */ + debug_write (&buf[i], chunk); + + /* Discard the ACK packet. */ + ignore_packet (); + } + + /* Send an "end of data" packet. */ + send_packet ('e', "", 0, 0); +} + + +/* Count loadable sections (helper function for r3900_load). */ + +static void +count_section (abfd, s, section_count) + bfd *abfd; + asection *s; + unsigned int *section_count; +{ + if (s->flags & SEC_LOAD && bfd_section_size (abfd, s) != 0) + (*section_count)++; +} + + +/* Load a single BFD section (helper function for r3900_load). + + WARNING: this code is filled with assumptions about how + the Densan monitor loads programs. The monitor issues + packets containing read requests, but rather than respond + to them in an general way, we expect them to following + a certain pattern. + + For example, we know that the monitor will start loading by + issuing an 8-byte read request for the binary file header. + We know this is coming and ignore the actual contents + of the read request packet. +*/ + +static void +load_section (abfd, s, data_count) + bfd *abfd; + asection *s; + unsigned int *data_count; +{ + if (s->flags & SEC_LOAD) + { + bfd_size_type section_size = bfd_section_size (abfd, s); + bfd_vma section_base = bfd_section_lma (abfd, s); + unsigned char *buffer; + unsigned char header[8]; + + /* Don't output zero-length sections. */ + if (section_size == 0) + return; + if (data_count) + *data_count += section_size; + + /* Print some fluff about the section being loaded. */ + printf_filtered ("Loading section %s, size 0x%lx lma ", + bfd_section_name (abfd, s), (long)section_size); + print_address_numeric (section_base, 1, gdb_stdout); + printf_filtered ("\n"); + gdb_flush (gdb_stdout); + + /* Write the section header (location and size). */ + write_long (&header[0], (long)section_base); + write_long (&header[4], (long)section_size); + process_read_request (header, sizeof (header)); + + /* Read the section contents into a buffer, write it out, + then free the buffer. */ + buffer = (unsigned char *) xmalloc (section_size); + bfd_get_section_contents (abfd, s, buffer, 0, section_size); + process_read_request (buffer, section_size); + free (buffer); + } +} + + +/* When the ethernet is used as the console port on the Densan board, + we can use the "Rm" command to do a fast binary load. The format + of the download data is: + + number of sections (4 bytes) + starting address (4 bytes) + repeat for each section: + location address (4 bytes) + section size (4 bytes) + binary data + + The 4-byte fields are all in big-endian order. + + Using this command is tricky because we have to put the monitor + into a special funky "communications interface" mode, in which + it sends and receives packets of data along with the normal prompt. + */ + +static void +r3900_load (filename, from_tty) + char *filename; + int from_tty; +{ + bfd *abfd; + unsigned int data_count = 0; + time_t start_time, end_time; /* for timing of download */ + int section_count = 0; + unsigned char buffer[8]; + + /* If we are not using the ethernet, use the normal monitor load, + which sends S-records over the serial link. */ + if (!ethernet) + { + orig_monitor_load (filename, from_tty); + return; + } + + /* Open the file. */ + if (filename == NULL || filename[0] == 0) + filename = get_exec_file (1); + abfd = bfd_openr (filename, 0); + if (!abfd) + error ("Unable to open file %s\n", filename); + if (bfd_check_format (abfd, bfd_object) == 0) + error ("File is not an object file\n"); + + /* Output the "vconsi" command to get the monitor in the communication + state where it will accept a load command. This will cause + the monitor to emit a packet before each prompt, so ignore the packet. */ + monitor_printf ("vconsi\r"); + ignore_packet (); + monitor_expect_prompt (NULL, 0); + + /* Output the "Rm" (load) command and respond to the subsequent "open" + packet by sending an ACK packet. */ + monitor_printf ("Rm\r"); + ignore_packet (); + send_packet ('a', "", 0, 0); + + /* Output the fast load header (number of sections and starting address). */ + bfd_map_over_sections ((bfd *) abfd, (section_map_func) count_section, + §ion_count); + write_long (&buffer[0], (long)section_count); + if (exec_bfd) + write_long (&buffer[4], (long)bfd_get_start_address (exec_bfd)); + else + write_long (&buffer[4], 0); + process_read_request (buffer, sizeof (buffer)); + + /* Output the section data. */ + start_time = time (NULL); + bfd_map_over_sections (abfd, (section_map_func) load_section, &data_count); + end_time = time (NULL); + + /* Acknowledge the close packet and put the monitor back into + "normal" mode so it won't send packets any more. */ + ignore_packet (); + send_packet ('a', "", 0, 0); + monitor_expect_prompt (NULL, 0); + monitor_printf ("vconsx\r"); + monitor_expect_prompt (NULL, 0); + + /* Print start address and download performance information. */ + printf_filtered ("Start address 0x%lx\n", (long)bfd_get_start_address (abfd)); + report_transfer_performance (data_count, start_time, end_time); + + /* Finally, make the PC point at the start address */ + if (exec_bfd) + write_pc (bfd_get_start_address (exec_bfd)); + + inferior_pid = 0; /* No process now */ + + /* This is necessary because many things were based on the PC at the + time that we attached to the monitor, which is no longer valid + now that we have loaded new code (and just changed the PC). + Another way to do this might be to call normal_stop, except that + the stack may not be valid, and things would get horribly + confused... */ + clear_symtab_users (); +} + + +/* Commands to send to the monitor when first connecting: + * The bare carriage return forces a prompt from the monitor + (monitor doesn't prompt immediately after a reset). + * The "vconsx" switches the monitor back to interactive mode + in case an aborted download had left it in packet mode. + * The "Xtr" command causes subsequent "t" (trace) commands to display + the general registers only. + * The "Xxr" command does the same thing for the "x" (examine + registers) command. + * The "bx" command clears all breakpoints. +*/ + +static char *r3900_inits[] = {"\r", "vconsx\r", "Xtr\r", "Xxr\r", "bx\r", NULL}; +static char *dummy_inits[] = { NULL }; + +static struct target_ops r3900_ops; +static struct monitor_ops r3900_cmds; + +static void +r3900_open (args, from_tty) + char *args; + int from_tty; +{ + char buf[64]; + int i; + + monitor_open (args, &r3900_cmds, from_tty); + + /* We have to handle sending the init strings ourselves, because + the first two strings we send (carriage returns) may not be echoed + by the monitor, but the rest will be. */ + monitor_printf_noecho ("\r\r"); + for (i = 0; r3900_inits[i] != NULL; i++) + { + monitor_printf (r3900_inits[i]); + monitor_expect_prompt (NULL, 0); + } + + /* Attempt to determine whether the console device is ethernet or serial. + This will tell us which kind of load to use (S-records over a serial + link, or the Densan fast binary multi-section format over the net). */ + + ethernet = 0; + monitor_printf ("v\r"); + if (monitor_expect ("console device :", NULL, 0) != -1) + if (monitor_expect ("\n", buf, sizeof (buf)) != -1) + if (strstr (buf, "ethernet") != NULL) + ethernet = 1; + monitor_expect_prompt (NULL, 0); +} + +void +_initialize_r3900_rom () +{ + r3900_cmds.flags = MO_NO_ECHO_ON_OPEN | + MO_ADDR_BITS_REMOVE | + MO_CLR_BREAK_USES_ADDR | + MO_GETMEM_READ_SINGLE | + MO_PRINT_PROGRAM_OUTPUT; + + r3900_cmds.init = dummy_inits; + r3900_cmds.cont = "g\r"; + r3900_cmds.step = "t\r"; + r3900_cmds.set_break = "b %A\r"; /* COREADDR */ + r3900_cmds.clr_break = "b %A,0\r"; /* COREADDR */ + r3900_cmds.fill = "fx %A s %x %x\r"; /* COREADDR, len, val */ + + r3900_cmds.setmem.cmdb = "sx %A %x\r"; /* COREADDR, val */ + r3900_cmds.setmem.cmdw = "sh %A %x\r"; /* COREADDR, val */ + r3900_cmds.setmem.cmdl = "sw %A %x\r"; /* COREADDR, val */ + + r3900_cmds.getmem.cmdb = "sx %A\r"; /* COREADDR */ + r3900_cmds.getmem.cmdw = "sh %A\r"; /* COREADDR */ + r3900_cmds.getmem.cmdl = "sw %A\r"; /* COREADDR */ + r3900_cmds.getmem.resp_delim = " : "; + r3900_cmds.getmem.term = " "; + r3900_cmds.getmem.term_cmd = ".\r"; + + r3900_cmds.setreg.cmd = "x%s %x\r"; /* regname, val */ + + r3900_cmds.getreg.cmd = "x%s\r"; /* regname */ + r3900_cmds.getreg.resp_delim = "="; + r3900_cmds.getreg.term = " "; + r3900_cmds.getreg.term_cmd = ".\r"; + + r3900_cmds.dump_registers = "x\r"; + r3900_cmds.register_pattern = + "\\([a-zA-Z0-9_]+\\) *=\\([0-9a-f]+ [0-9a-f]+\\b\\)"; + r3900_cmds.supply_register = r3900_supply_register; + /* S-record download, via "keyboard port". */ + r3900_cmds.load = "r0\r"; + r3900_cmds.prompt = "#"; + r3900_cmds.line_term = "\r"; + r3900_cmds.target = &r3900_ops; + r3900_cmds.stopbits = SERIAL_1_STOPBITS; + r3900_cmds.regnames = r3900_regnames; + r3900_cmds.magic = MONITOR_OPS_MAGIC; + + init_monitor_ops (&r3900_ops); + + r3900_ops.to_shortname = "r3900"; + r3900_ops.to_longname = "R3900 monitor"; + r3900_ops.to_doc = "Debug using the DVE R3900 monitor.\n\ +Specify the serial device it is connected to (e.g. /dev/ttya)."; + r3900_ops.to_open = r3900_open; + + /* Override the functions to fetch and store registers. But save the + addresses of the default functions, because we will use those functions + for "normal" registers. */ + + orig_monitor_fetch_registers = r3900_ops.to_fetch_registers; + orig_monitor_store_registers = r3900_ops.to_store_registers; + r3900_ops.to_fetch_registers = r3900_fetch_registers; + r3900_ops.to_store_registers = r3900_store_registers; + + /* Override the load function, but save the address of the default + function to use when loading S-records over a serial link. */ + orig_monitor_load = r3900_ops.to_load; + r3900_ops.to_load = r3900_load; + + add_target (&r3900_ops); +} |