-/* Remote debugging interface for Tandem ST2000 phone switch, for GDB.
- Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
- Contributed by Cygnus Support. Written by Jim Kingdon for Cygnus.
-
-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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-/* This file was derived from remote-eb.c, which did a similar job, but for
- an AMD-29K running EBMON. That file was in turn derived from remote.c
- as mentioned in the following comment (left in for comic relief):
-
- "This is like remote.c but is for an esoteric situation--
- having a 29k board in a PC hooked up to a unix machine with
- a serial line, and running ctty com1 on the PC, through which
- the unix machine can run ebmon. Not to mention that the PC
- has PC/NFS, so it can access the same executables that gdb can,
- over the net in real time."
-
- In reality, this module talks to a debug monitor called 'STDEBUG', which
- runs in a phone switch. We communicate with STDEBUG via either a direct
- serial line, or a TCP (or possibly TELNET) stream to a terminal multiplexor,
- which in turn talks to the phone switch. */
-
-#include "defs.h"
-#include "gdbcore.h"
-#include "terminal.h"
-#include "target.h"
-#include "wait.h"
-#include <varargs.h>
-#include <signal.h>
-#include <string.h>
-
-extern struct target_ops st2000_ops; /* Forward declaration */
-
-static void st2000_close();
-static void st2000_fetch_register();
-static void st2000_store_register();
-
-#define LOG_FILE "st2000.log"
-#if defined (LOG_FILE)
-FILE *log_file;
-#endif
-
-static int timeout = 24;
-
-/* Descriptor for I/O to remote machine. Initialize it to -1 so that
- st2000_open knows that we don't have a file open when the program
- starts. */
-int st2000_desc = -1;
-
-/* stream which is fdopen'd from st2000_desc. Only valid when
- st2000_desc != -1. */
-FILE *st2000_stream;
-
-/* Send data to stdebug. Works just like printf. */
-
-static void
-printf_stdebug(va_alist)
- va_dcl
-{
- va_list args;
- char *pattern;
-
- va_start(args);
-
- pattern = va_arg(args, char *);
-
- vfprintf(st2000_stream, pattern, args);
- fflush(st2000_stream);
-}
-
-/* Read a character from the remote system, doing all the fancy
- timeout stuff. */
-static int
-readchar ()
-{
- char buf;
-
- buf = '\0';
-#ifdef HAVE_TERMIO
- /* termio does the timeout for us. */
- read (st2000_desc, &buf, 1);
-#else
- alarm (timeout);
- if (read (st2000_desc, &buf, 1) < 0)
- {
- if (errno == EINTR)
- error ("Timeout reading from remote system.");
- else
- perror_with_name ("remote");
- }
- alarm (0);
-#endif
-
- if (buf == '\0')
- error ("Timeout reading from remote system.");
-#if defined (LOG_FILE)
- putc (buf & 0x7f, log_file);
-#endif
- return buf & 0x7f;
-}
-
-/* Keep discarding input from the remote system, until STRING is found.
- Let the user break out immediately. */
-static void
-expect (string)
- char *string;
-{
- char *p = string;
-
- immediate_quit = 1;
- while (1)
- {
- if (readchar() == *p)
- {
- p++;
- if (*p == '\0')
- {
- immediate_quit = 0;
- return;
- }
- }
- else
- p = string;
- }
-}
-
-/* Keep discarding input until we see the STDEBUG prompt.
-
- The convention for dealing with the prompt is that you
- o give your command
- o *then* wait for the prompt.
-
- Thus the last thing that a procedure does with the serial line
- will be an expect_prompt(). Exception: st2000_resume does not
- wait for the prompt, because the terminal is being handed over
- to the inferior. However, the next thing which happens after that
- is a st2000_wait which does wait for the prompt.
- Note that this includes abnormal exit, e.g. error(). This is
- necessary to prevent getting into states from which we can't
- recover. */
-static void
-expect_prompt ()
-{
-#if defined (LOG_FILE)
- /* This is a convenient place to do this. The idea is to do it often
- enough that we never lose much data if we terminate abnormally. */
- fflush (log_file);
-#endif
- expect ("dbug> ");
-}
-
-/* Get a hex digit from the remote system & return its value.
- If ignore_space is nonzero, ignore spaces (not newline, tab, etc). */
-static int
-get_hex_digit (ignore_space)
- int ignore_space;
-{
- int ch;
- while (1)
- {
- ch = readchar ();
- if (ch >= '0' && ch <= '9')
- return ch - '0';
- else if (ch >= 'A' && ch <= 'F')
- return ch - 'A' + 10;
- else if (ch >= 'a' && ch <= 'f')
- return ch - 'a' + 10;
- else if (ch == ' ' && ignore_space)
- ;
- else
- {
- expect_prompt ();
- error ("Invalid hex digit from remote system.");
- }
- }
-}
-
-/* Get a byte from st2000_desc and put it in *BYT. Accept any number
- leading spaces. */
-static void
-get_hex_byte (byt)
- char *byt;
-{
- int val;
-
- val = get_hex_digit (1) << 4;
- val |= get_hex_digit (0);
- *byt = val;
-}
-
-/* Get N 32-bit words from remote, each preceded by a space,
- and put them in registers starting at REGNO. */
-static void
-get_hex_regs (n, regno)
- int n;
- int regno;
-{
- long val;
- int i;
-
- for (i = 0; i < n; i++)
- {
- int j;
-
- val = 0;
- for (j = 0; j < 8; j++)
- val = (val << 4) + get_hex_digit (j == 0);
- supply_register (regno++, (char *) &val);
- }
-}
-
-/* Called when SIGALRM signal sent due to alarm() timeout. */
-#ifndef HAVE_TERMIO
-
-#ifndef __STDC__
-#define volatile /**/
-#endif
-volatile int n_alarms;
-
-static void
-st2000_timer ()
-{
- n_alarms++;
-}
-#endif
-
-/* This is called not only when we first attach, but also when the
- user types "run" after having attached. */
-static void
-st2000_create_inferior (execfile, args, env)
- char *execfile;
- char *args;
- char **env;
-{
- int entry_pt;
-
- if (args && *args)
- error ("Can't pass arguments to remote STDEBUG process");
-
- if (execfile == 0 || exec_bfd == 0)
- error ("No exec file specified");
-
- entry_pt = (int) bfd_get_start_address (exec_bfd);
-
-#ifdef CREATE_INFERIOR_HOOK
- CREATE_INFERIOR_HOOK (0); /* No process-ID */
-#endif
-
-/* The "process" (board) is already stopped awaiting our commands, and
- the program is already downloaded. We just set its PC and go. */
-
- clear_proceed_status ();
-
- /* Tell wait_for_inferior that we've started a new process. */
- init_wait_for_inferior ();
-
- /* Set up the "saved terminal modes" of the inferior
- based on what modes we are starting it with. */
- target_terminal_init ();
-
- /* Install inferior's terminal modes. */
- target_terminal_inferior ();
-
- /* insert_step_breakpoint (); FIXME, do we need this? */
- proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */
-}
-
-/* Translate baud rates from integers to damn B_codes. Unix should
- have outgrown this crap years ago, but even POSIX wouldn't buck it. */
-
-#ifndef B19200
-#define B19200 EXTA
-#endif
-#ifndef B38400
-#define B38400 EXTB
-#endif
-
-static struct {int rate, damn_b;} baudtab[] = {
- {0, B0},
- {50, B50},
- {75, B75},
- {110, B110},
- {134, B134},
- {150, B150},
- {200, B200},
- {300, B300},
- {600, B600},
- {1200, B1200},
- {1800, B1800},
- {2400, B2400},
- {4800, B4800},
- {9600, B9600},
- {19200, B19200},
- {38400, B38400},
- {-1, -1},
-};
-
-static int
-damn_b (rate)
- int rate;
-{
- int i;
-
- for (i = 0; baudtab[i].rate != -1; i++)
- if (rate == baudtab[i].rate) return baudtab[i].damn_b;
- return B38400; /* Random */
-}
-
-
-/* Open a connection to a remote debugger.
- NAME is the filename used for communication. */
-
-static int baudrate = 9600;
-static char *dev_name;
-
-static TERMINAL old_sg;
-
-static void
-st2000_open (name, from_tty)
- char *name;
- int from_tty;
-{
- TERMINAL sg;
-
- char *p;
-
- target_preopen (from_tty);
-
- if (!name)
- goto erroid;
-
- /* Find the first whitespace character, it separates dev_name from
- the baud rate. */
-
- for (p = name; *p && !isspace (*p); p++)
- ;
- if (*p == '\0')
-erroid:
- error ("\
-Please include the name of the device for the serial port, and the baud rate.");
-
- dev_name = alloca (p - name + 1);
- strncpy (dev_name, name, p - name);
- dev_name[p - name] = '\0';
-
- /* Skip over the whitespace after dev_name */
- for (; isspace (*p); p++)
- /*EMPTY*/;
-
- if (1 != sscanf (p, "%d ", &baudrate))
- goto erroid;
-
- st2000_close (0);
-
- st2000_desc = open (dev_name, O_RDWR);
- if (st2000_desc < 0)
- perror_with_name (dev_name);
- ioctl (st2000_desc, TIOCGETP, &sg);
- old_sg = sg;
-
-#ifdef HAVE_TERMIO
- sg.c_cc[VMIN] = 0; /* read with timeout. */
- sg.c_cc[VTIME] = timeout * 10;
- sg.c_lflag &= ~(ICANON | ECHO);
- sg.c_cflag = (sg.c_cflag & ~CBAUD) | damn_b (baudrate);
-#else
- sg.sg_ispeed = damn_b (baudrate);
- sg.sg_ospeed = damn_b (baudrate);
- sg.sg_flags |= RAW | ANYP;
- sg.sg_flags &= ~ECHO;
-#endif
-
- ioctl (st2000_desc, TIOCSETP, &sg);
- st2000_stream = fdopen (st2000_desc, "r+");
-
- push_target (&st2000_ops);
-
-#ifndef HAVE_TERMIO
-#ifndef NO_SIGINTERRUPT
- /* Cause SIGALRM's to make reads fail with EINTR instead of resuming
- the read. */
- if (siginterrupt (SIGALRM, 1) != 0)
- perror ("st2000_open: error in siginterrupt");
-#endif
-
- /* Set up read timeout timer. */
- if ((void (*)) signal (SIGALRM, st2000_timer) == (void (*)) -1)
- perror ("st2000_open: error in signal");
-#endif
-
-#if defined (LOG_FILE)
- log_file = fopen (LOG_FILE, "w");
- if (log_file == NULL)
- perror_with_name (LOG_FILE);
-#endif
-
- /* Hello? Are you there? */
- printf_stdebug ("\r");
-
- expect_prompt ();
-
- if (from_tty)
- printf ("Remote %s connected to %s\n", target_shortname,
- dev_name);
-}
-
-/* Close out all files and local state before this target loses control. */
-
-static void
-st2000_close (quitting)
- int quitting;
-{
-
- /* Reset the terminal to its original settings. */
-
- ioctl (st2000_desc, TIOCSETP, &old_sg);
-
- /* Due to a bug in Unix, fclose closes not only the stdio stream,
- but also the file descriptor. So we don't actually close
- st2000_desc. */
- if (st2000_stream)
- fclose (st2000_stream); /* This also closes st2000_desc */
-
- /* Do not try to close st2000_desc again, later in the program. */
- st2000_stream = NULL;
- st2000_desc = -1;
-
-#if defined (LOG_FILE)
- if (log_file) {
- if (ferror (log_file))
- printf ("Error writing log file.\n");
- if (fclose (log_file) != 0)
- printf ("Error closing log file.\n");
- }
-#endif
-}
-
-/* Terminate the open connection to the remote debugger.
- Use this when you want to detach and do something else
- with your gdb. */
-static void
-st2000_detach (from_tty)
- int from_tty;
-{
- pop_target(); /* calls st2000_close to do the real work */
- if (from_tty)
- printf ("Ending remote %s debugging\n", target_shortname);
-}
-
-/* Tell the remote machine to resume. */
-
-static void
-st2000_resume (step, sig)
- int step, sig;
-{
- if (step)
- {
- printf_stdebug ("ST\r");
- /* Wait for the echo. */
- expect ("ST\r");
- }
- else
- {
- printf_stdebug ("GO\r");
- /* Swallow the echo. */
- expect ("GO\r");
- }
-}
-
-/* Wait until the remote machine stops, then return,
- storing status in STATUS just as `wait' would. */
-
-static int
-st2000_wait (status)
- WAITTYPE *status;
-{
- /* FIXME --- USE A REAL STRING MATCHING ALGORITHM HERE!!! */
-
- static char bpt[] = "dbug> ";
- char *bp = bpt;
-
- /* Large enough for either sizeof (bpt) or sizeof (exitmsg) chars. */
- char swallowed[50];
- /* Current position in swallowed. */
- char *swallowed_p = swallowed;
-
- int ch;
- int ch_handled;
-
- int old_timeout = timeout;
-
- WSETEXIT ((*status), 0);
-
- timeout = 0; /* Don't time out -- user program is running. */
- while (1)
- {
- ch_handled = 0;
- ch = readchar ();
- if (ch == *bp)
- {
- bp++;
- if (*bp == '\0')
- break;
- ch_handled = 1;
-
- *swallowed_p++ = ch;
- }
- else
- bp = bpt;
-
- if (!ch_handled)
- {
- char *p;
-
- /* Print out any characters which have been swallowed. */
- for (p = swallowed; p < swallowed_p; ++p)
- putc (*p, stdout);
- swallowed_p = swallowed;
-
- putc (ch, stdout);
- }
- }
- if (*bp == '\000')
- WSETSTOP ((*status), SIGTRAP);
- else
- WSETEXIT ((*status), 0);
- timeout = old_timeout;
-
- return 0;
-}
-
-/* Return the name of register number REGNO in the form input and output by
- STDEBUG. Currently, REGISTER_NAMES just happens to contain exactly what
- STDEBUG wants. Lets take advantage of that just as long as possible! */
-
-static char *
-get_reg_name (regno)
- int regno;
-{
- static char buf[50];
- char *p, *b;
-
- b = buf;
-
- for (p = reg_names[regno]; *p; p++)
- *b++ = toupper(*p);
- *b = '\000';
-
- return buf;
-}
-
-/* Read the remote registers into the block REGS. */
-
-static void
-st2000_fetch_registers ()
-{
- int regno;
-
- /* Yeah yeah, I know this is horribly inefficient. But it isn't done
- very often... I'll clean it up later. */
-
- for (regno = 0; regno <= PC_REGNUM; regno++)
- st2000_fetch_register(regno);
-}
-
-/* Fetch register REGNO, or all registers if REGNO is -1.
- Returns errno value. */
-static void
-st2000_fetch_register (regno)
- int regno;
-{
- if (regno == -1)
- st2000_fetch_registers ();
- else
- {
- char *name = get_reg_name (regno);
- printf_stdebug ("DR %s\r", name);
- expect (name);
- expect (" : ");
- get_hex_regs (1, regno);
- expect_prompt ();
- }
- return;
-}
-
-/* Store the remote registers from the contents of the block REGS. */
-
-static void
-st2000_store_registers ()
-{
- int regno;
-
- for (regno = 0; regno <= PC_REGNUM; regno++)
- st2000_store_register(regno);
-
- registers_changed ();
-}
-
-/* Store register REGNO, or all if REGNO == 0.
- Return errno value. */
-static void
-st2000_store_register (regno)
- int regno;
-{
- if (regno == -1)
- st2000_store_registers ();
- else
- {
- printf_stdebug ("PR %s %x\r", get_reg_name (regno),
- read_register (regno));
-
- expect_prompt ();
- }
-}
-
-/* Get ready to modify the registers array. On machines which store
- individual registers, this doesn't need to do anything. On machines
- which store all the registers in one fell swoop, this makes sure
- that registers contains all the registers from the program being
- debugged. */
-
-static void
-st2000_prepare_to_store ()
-{
- /* Do nothing, since we can store individual regs */
-}
-
-static void
-st2000_files_info ()
-{
- printf ("\tAttached to %s at %d baud.\n",
- dev_name, baudrate);
-}
-
-/* Copy LEN bytes of data from debugger memory at MYADDR
- to inferior's memory at MEMADDR. Returns length moved. */
-static int
-st2000_write_inferior_memory (memaddr, myaddr, len)
- CORE_ADDR memaddr;
- unsigned char *myaddr;
- int len;
-{
- int i;
-
- for (i = 0; i < len; i++)
- {
- printf_stdebug ("PM.B %x %x\r", memaddr + i, myaddr[i]);
- expect_prompt ();
- }
- return len;
-}
-
-/* Read LEN bytes from inferior memory at MEMADDR. Put the result
- at debugger address MYADDR. Returns length moved. */
-static int
-st2000_read_inferior_memory(memaddr, myaddr, len)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
-{
- int i;
-
- /* Number of bytes read so far. */
- int count;
-
- /* Starting address of this pass. */
- unsigned long startaddr;
-
- /* Number of bytes to read in this pass. */
- int len_this_pass;
-
- /* Note that this code works correctly if startaddr is just less
- than UINT_MAX (well, really CORE_ADDR_MAX if there was such a
- thing). That is, something like
- st2000_read_bytes (CORE_ADDR_MAX - 4, foo, 4)
- works--it never adds len to memaddr and gets 0. */
- /* However, something like
- st2000_read_bytes (CORE_ADDR_MAX - 3, foo, 4)
- doesn't need to work. Detect it and give up if there's an attempt
- to do that. */
- if (((memaddr - 1) + len) < memaddr) {
- errno = EIO;
- return 0;
- }
-
- startaddr = memaddr;
- count = 0;
- while (count < len)
- {
- len_this_pass = 16;
- if ((startaddr % 16) != 0)
- len_this_pass -= startaddr % 16;
- if (len_this_pass > (len - count))
- len_this_pass = (len - count);
-
- printf_stdebug ("DI.L %x %x\r", startaddr, len_this_pass);
- expect (": ");
-
- for (i = 0; i < len_this_pass; i++)
- get_hex_byte (&myaddr[count++]);
-
- expect_prompt ();
-
- startaddr += len_this_pass;
- }
- return len;
-}
-
-/* FIXME-someday! Merge these two. */
-static int
-st2000_xfer_inferior_memory (memaddr, myaddr, len, write, target)
- CORE_ADDR memaddr;
- char *myaddr;
- int len;
- int write;
- struct target_ops *target; /* ignored */
-{
- if (write)
- return st2000_write_inferior_memory (memaddr, myaddr, len);
- else
- return st2000_read_inferior_memory (memaddr, myaddr, len);
-}
-
-static void
-st2000_kill (args, from_tty)
- char *args;
- int from_tty;
-{
- return; /* Ignore attempts to kill target system */
-}
-
-/* Clean up when a program exits.
-
- The program actually lives on in the remote processor's RAM, and may be
- run again without a download. Don't leave it full of breakpoint
- instructions. */
-
-static void
-st2000_mourn_inferior ()
-{
- remove_breakpoints ();
- generic_mourn_inferior (); /* Do all the proper things now */
-}
-
-#define MAX_STDEBUG_BREAKPOINTS 16
-
-extern int memory_breakpoint_size;
-static CORE_ADDR breakaddr[MAX_STDEBUG_BREAKPOINTS] = {0};
-
-static int
-st2000_insert_breakpoint (addr, shadow)
- CORE_ADDR addr;
- char *shadow;
-{
- int i;
-
- for (i = 0; i <= MAX_STDEBUG_BREAKPOINTS; i++)
- if (breakaddr[i] == 0)
- {
- breakaddr[i] = addr;
-
- st2000_read_inferior_memory(addr, shadow, memory_breakpoint_size);
- printf_stdebug("BR %x H\r", addr);
- expect_prompt();
- return 0;
- }
-
- fprintf(stderr, "Too many breakpoints (> 16) for STDBUG\n");
- return 1;
-}
-
-static int
-st2000_remove_breakpoint (addr, shadow)
- CORE_ADDR addr;
- char *shadow;
-{
- int i;
-
- for (i = 0; i < MAX_STDEBUG_BREAKPOINTS; i++)
- if (breakaddr[i] == addr)
- {
- breakaddr[i] = 0;
-
- printf_stdebug("CB %d\r", i);
- expect_prompt();
- return 0;
- }
-
- fprintf(stderr, "Can't find breakpoint associated with 0x%x\n", addr);
- return 1;
-}
-
-/* Define the target subroutine names */
-
-static struct target_ops st2000_ops = {
- "st2000", "Remote serial Tandem ST2000 target",
- "Use a remote computer running STDEBUG connected by a serial line,\n\
-or a network connection.\n\
-Arguments are the name of the device for the serial line,\n\
-the speed to connect at in bits per second.",
- st2000_open, st2000_close,
- 0, st2000_detach, st2000_resume, st2000_wait,
- st2000_fetch_register, st2000_store_register,
- st2000_prepare_to_store, 0, 0, /* conv_to, conv_from */
- st2000_xfer_inferior_memory, st2000_files_info,
- st2000_insert_breakpoint, st2000_remove_breakpoint, /* Breakpoints */
- 0, 0, 0, 0, 0, /* Terminal handling */
- st2000_kill,
- 0, /* load */
- 0, /* lookup_symbol */
- st2000_create_inferior,
- st2000_mourn_inferior,
- process_stratum, 0, /* next */
- 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
- 0, 0, /* Section pointers */
- OPS_MAGIC, /* Always the last thing */
-};
-
-void
-_initialize_remote_st2000 ()
-{
- add_target (&st2000_ops);
-}
projects / deliverable / binutils-gdb.git / blobdiff