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Diffstat (limited to 'gdb/remote-nindy.c')
| -rw-r--r-- | gdb/remote-nindy.c | 762 |
1 files changed, 762 insertions, 0 deletions
diff --git a/gdb/remote-nindy.c b/gdb/remote-nindy.c new file mode 100644 index 00000000000..679dfad919e --- /dev/null +++ b/gdb/remote-nindy.c @@ -0,0 +1,762 @@ +/* Memory-access and commands for remote NINDY process, for GDB. + + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, + 2000, 2001, 2002 Free Software Foundation, Inc. + + Contributed by Intel Corporation. Modified from remote.c by Chris Benenati. + + GDB is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY. No author or distributor accepts responsibility to anyone + for the consequences of using it or for whether it serves any + particular purpose or works at all, unless he says so in writing. + Refer to the GDB General Public License for full details. + + Everyone is granted permission to copy, modify and redistribute GDB, + but only under the conditions described in the GDB General Public + License. A copy of this license is supposed to have been given to you + along with GDB so you can know your rights and responsibilities. It + should be in a file named COPYING. Among other things, the copyright + notice and this notice must be preserved on all copies. + + In other words, go ahead and share GDB, but don't try to stop + anyone else from sharing it farther. Help stamp out software hoarding! */ + +/* + Except for the data cache routines, this file bears little resemblence + to remote.c. A new (although similar) protocol has been specified, and + portions of the code are entirely dependent on having an i80960 with a + NINDY ROM monitor at the other end of the line. + */ + +/***************************************************************************** + * + * REMOTE COMMUNICATION PROTOCOL BETWEEN GDB960 AND THE NINDY ROM MONITOR. + * + * + * MODES OF OPERATION + * ----- -- --------- + * + * As far as NINDY is concerned, GDB is always in one of two modes: command + * mode or passthrough mode. + * + * In command mode (the default) pre-defined packets containing requests + * are sent by GDB to NINDY. NINDY never talks except in reponse to a request. + * + * Once the the user program is started, GDB enters passthrough mode, to give + * the user program access to the terminal. GDB remains in this mode until + * NINDY indicates that the program has stopped. + * + * + * PASSTHROUGH MODE + * ----------- ---- + * + * GDB writes all input received from the keyboard directly to NINDY, and writes + * all characters received from NINDY directly to the monitor. + * + * Keyboard input is neither buffered nor echoed to the monitor. + * + * GDB remains in passthrough mode until NINDY sends a single ^P character, + * to indicate that the user process has stopped. + * + * Note: + * GDB assumes NINDY performs a 'flushreg' when the user program stops. + * + * + * COMMAND MODE + * ------- ---- + * + * All info (except for message ack and nak) is transferred between gdb + * and the remote processor in messages of the following format: + * + * <info>#<checksum> + * + * where + * # is a literal character + * + * <info> ASCII information; all numeric information is in the + * form of hex digits ('0'-'9' and lowercase 'a'-'f'). + * + * <checksum> + * is a pair of ASCII hex digits representing an 8-bit + * checksum formed by adding together each of the + * characters in <info>. + * + * The receiver of a message always sends a single character to the sender + * to indicate that the checksum was good ('+') or bad ('-'); the sender + * re-transmits the entire message over until a '+' is received. + * + * In response to a command NINDY always sends back either data or + * a result code of the form "Xnn", where "nn" are hex digits and "X00" + * means no errors. (Exceptions: the "s" and "c" commands don't respond.) + * + * SEE THE HEADER OF THE FILE "gdb.c" IN THE NINDY MONITOR SOURCE CODE FOR A + * FULL DESCRIPTION OF LEGAL COMMANDS. + * + * SEE THE FILE "stop.h" IN THE NINDY MONITOR SOURCE CODE FOR A LIST + * OF STOP CODES. + * + ***************************************************************************/ + +#include "defs.h" +#include <signal.h> +#include <sys/types.h> +#include <setjmp.h> + +#include "frame.h" +#include "inferior.h" +#include "bfd.h" +#include "symfile.h" +#include "target.h" +#include "gdbcore.h" +#include "command.h" +#include "floatformat.h" +#include "regcache.h" + +#include <sys/file.h> +#include <ctype.h> +#include "serial.h" +#include "nindy-share/env.h" +#include "nindy-share/stop.h" +#include "remote-utils.h" + +extern int unlink (); +extern char *getenv (); +extern char *mktemp (); + +extern void generic_mourn_inferior (); + +extern struct target_ops nindy_ops; +extern FILE *instream; + +extern char ninStopWhy (); +extern int ninMemGet (); +extern int ninMemPut (); + +int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */ +int nindy_old_protocol; /* nonzero if want to use old protocol */ +char *nindy_ttyname; /* name of tty to talk to nindy on, or null */ + +#define DLE '\020' /* Character NINDY sends to indicate user program has + * halted. */ +#define TRUE 1 +#define FALSE 0 + +/* From nindy-share/nindy.c. */ +extern struct serial *nindy_serial; + +static int have_regs = 0; /* 1 iff regs read since i960 last halted */ +static int regs_changed = 0; /* 1 iff regs were modified since last read */ + +extern char *exists (); + +static void nindy_fetch_registers (int); + +static void nindy_store_registers (int); + +static char *savename; + +static void +nindy_close (int quitting) +{ + if (nindy_serial != NULL) + serial_close (nindy_serial); + nindy_serial = NULL; + + if (savename) + xfree (savename); + savename = 0; +} + +/* Open a connection to a remote debugger. + FIXME, there should be "set" commands for the options that are + now specified with gdb command-line options (old_protocol, + and initial_brk). */ +void +nindy_open (char *name, /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */ + int from_tty) +{ + char baudrate[1024]; + + if (!name) + error_no_arg ("serial port device name"); + + target_preopen (from_tty); + + nindy_close (0); + + have_regs = regs_changed = 0; + + /* Allow user to interrupt the following -- we could hang if there's + no NINDY at the other end of the remote tty. */ + immediate_quit++; + /* If baud_rate is -1, then ninConnect will not recognize the baud rate + and will deal with the situation in a (more or less) reasonable + fashion. */ + sprintf (baudrate, "%d", baud_rate); + ninConnect (name, baudrate, + nindy_initial_brk, !from_tty, nindy_old_protocol); + immediate_quit--; + + if (nindy_serial == NULL) + { + perror_with_name (name); + } + + savename = savestring (name, strlen (name)); + push_target (&nindy_ops); + + target_fetch_registers (-1); + + init_thread_list (); + init_wait_for_inferior (); + clear_proceed_status (); + normal_stop (); +} + +/* User-initiated quit of nindy operations. */ + +static void +nindy_detach (char *name, int from_tty) +{ + if (name) + error ("Too many arguments"); + pop_target (); +} + +static void +nindy_files_info (void) +{ + /* FIXME: this lies about the baud rate if we autobauded. */ + printf_unfiltered ("\tAttached to %s at %d bits per second%s%s.\n", savename, + baud_rate, + nindy_old_protocol ? " in old protocol" : "", + nindy_initial_brk ? " with initial break" : ""); +} + +/* Return the number of characters in the buffer BUF before + the first DLE character. N is maximum number of characters to + consider. */ + +static +int +non_dle (char *buf, int n) +{ + int i; + + for (i = 0; i < n; i++) + { + if (buf[i] == DLE) + { + break; + } + } + return i; +} + +/* Tell the remote machine to resume. */ + +void +nindy_resume (ptid_t ptid, int step, enum target_signal siggnal) +{ + if (siggnal != TARGET_SIGNAL_0 && siggnal != stop_signal) + warning ("Can't send signals to remote NINDY targets."); + + if (regs_changed) + { + nindy_store_registers (-1); + regs_changed = 0; + } + have_regs = 0; + ninGo (step); +} + +/* FIXME, we can probably use the normal terminal_inferior stuff here. + We have to do terminal_inferior and then set up the passthrough + settings initially. Thereafter, terminal_ours and terminal_inferior + will automatically swap the settings around for us. */ + +struct clean_up_tty_args +{ + serial_ttystate state; + struct serial *serial; +}; +static struct clean_up_tty_args tty_args; + +static void +clean_up_tty (PTR ptrarg) +{ + struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg; + serial_set_tty_state (args->serial, args->state); + xfree (args->state); + warning ("\n\nYou may need to reset the 80960 and/or reload your program.\n"); +} + +/* Recover from ^Z or ^C while remote process is running */ +static void (*old_ctrlc) (); +#ifdef SIGTSTP +static void (*old_ctrlz) (); +#endif + +static void +clean_up_int (void) +{ + serial_set_tty_state (tty_args.serial, tty_args.state); + xfree (tty_args.state); + + signal (SIGINT, old_ctrlc); +#ifdef SIGTSTP + signal (SIGTSTP, old_ctrlz); +#endif + error ("\n\nYou may need to reset the 80960 and/or reload your program.\n"); +} + +/* Wait until the remote machine stops. While waiting, operate in passthrough + * mode; i.e., pass everything NINDY sends to gdb_stdout, and everything from + * stdin to NINDY. + * + * Return to caller, storing status in 'status' just as `wait' would. + */ + +static ptid_t +nindy_wait (ptid_t ptid, struct target_waitstatus *status) +{ + fd_set fds; + int c; + char buf[2]; + int i, n; + unsigned char stop_exit; + unsigned char stop_code; + struct cleanup *old_cleanups; + long ip_value, fp_value, sp_value; /* Reg values from stop */ + + status->kind = TARGET_WAITKIND_EXITED; + status->value.integer = 0; + + /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */ + + /* Save current tty attributes, and restore them when done. */ + tty_args.serial = serial_fdopen (0); + tty_args.state = serial_get_tty_state (tty_args.serial); + old_ctrlc = signal (SIGINT, clean_up_int); +#ifdef SIGTSTP + old_ctrlz = signal (SIGTSTP, clean_up_int); +#endif + + old_cleanups = make_cleanup (clean_up_tty, &tty_args); + + /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret + <CR> and perform echo. */ + /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close + enough. */ + serial_raw (tty_args.serial); + + while (1) + { + /* Input on remote */ + c = serial_readchar (nindy_serial, -1); + if (c == SERIAL_ERROR) + { + error ("Cannot read from serial line"); + } + else if (c == 0x1b) /* ESC */ + { + c = serial_readchar (nindy_serial, -1); + c &= ~0x40; + } + else if (c != 0x10) /* DLE */ + /* Write out any characters preceding DLE */ + { + buf[0] = (char) c; + write (1, buf, 1); + } + else + { + stop_exit = ninStopWhy (&stop_code, + &ip_value, &fp_value, &sp_value); + if (!stop_exit && (stop_code == STOP_SRQ)) + { + immediate_quit++; + ninSrq (); + immediate_quit--; + } + else + { + /* Get out of loop */ + supply_register (IP_REGNUM, + (char *) &ip_value); + supply_register (FP_REGNUM, + (char *) &fp_value); + supply_register (SP_REGNUM, + (char *) &sp_value); + break; + } + } + } + + serial_set_tty_state (tty_args.serial, tty_args.state); + xfree (tty_args.state); + discard_cleanups (old_cleanups); + + if (stop_exit) + { + status->kind = TARGET_WAITKIND_EXITED; + status->value.integer = stop_code; + } + else + { + /* nindy has some special stop code need to be handled */ + if (stop_code == STOP_GDB_BPT) + stop_code = TRACE_STEP; + status->kind = TARGET_WAITKIND_STOPPED; + status->value.sig = i960_fault_to_signal (stop_code); + } + return inferior_ptid; +} + +/* Read the remote registers into the block REGS. */ + +/* This is the block that ninRegsGet and ninRegsPut handles. */ +struct nindy_regs +{ + char local_regs[16 * 4]; + char global_regs[16 * 4]; + char pcw_acw[2 * 4]; + char ip[4]; + char tcw[4]; + char fp_as_double[4 * 8]; +}; + +static void +nindy_fetch_registers (int regno) +{ + struct nindy_regs nindy_regs; + int regnum; + + immediate_quit++; + ninRegsGet ((char *) &nindy_regs); + immediate_quit--; + + memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16 * 4); + memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16 * 4); + memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2 * 4); + memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1 * 4); + memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1 * 4); + memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], nindy_regs.fp_as_double, 4 * 8); + + registers_fetched (); +} + +static void +nindy_prepare_to_store (void) +{ + /* Fetch all regs if they aren't already here. */ + read_register_bytes (0, NULL, REGISTER_BYTES); +} + +static void +nindy_store_registers (int regno) +{ + struct nindy_regs nindy_regs; + int regnum; + + memcpy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16 * 4); + memcpy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16 * 4); + memcpy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2 * 4); + memcpy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1 * 4); + memcpy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1 * 4); + memcpy (nindy_regs.fp_as_double, ®isters[REGISTER_BYTE (FP0_REGNUM)], 8 * 4); + + immediate_quit++; + ninRegsPut ((char *) &nindy_regs); + immediate_quit--; +} + +/* Copy LEN bytes to or from inferior's memory starting at MEMADDR + to debugger memory starting at MYADDR. Copy to inferior if + SHOULD_WRITE is nonzero. Returns the length copied. TARGET is + unused. */ + +int +nindy_xfer_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len, + int should_write, struct mem_attrib *attrib, + struct target_ops *target) +{ + int res; + + if (len <= 0) + return 0; + + if (should_write) + res = ninMemPut (memaddr, myaddr, len); + else + res = ninMemGet (memaddr, myaddr, len); + + return res; +} + +static void +nindy_create_inferior (char *execfile, char *args, char **env) +{ + int entry_pt; + int pid; + + if (args && *args) + error ("Can't pass arguments to remote NINDY process"); + + if (execfile == 0 || exec_bfd == 0) + error ("No executable file specified"); + + entry_pt = (int) bfd_get_start_address (exec_bfd); + + pid = 42; + + /* The "process" (board) is already stopped awaiting our commands, and + the program is already downloaded. We just set its PC and go. */ + + inferior_ptid = pid_to_ptid (pid); /* Needed for wait_for_inferior below */ + + 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? */ + /* Let 'er rip... */ + proceed ((CORE_ADDR) entry_pt, TARGET_SIGNAL_DEFAULT, 0); +} + +static void +reset_command (char *args, int from_tty) +{ + if (nindy_serial == NULL) + { + error ("No target system to reset -- use 'target nindy' command."); + } + if (query ("Really reset the target system?", 0, 0)) + { + serial_send_break (nindy_serial); + tty_flush (nindy_serial); + } +} + +void +nindy_kill (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. */ + +void +nindy_mourn_inferior (void) +{ + remove_breakpoints (); + unpush_target (&nindy_ops); + generic_mourn_inferior (); /* Do all the proper things now */ +} + +/* Pass the args the way catch_errors wants them. */ +static int +nindy_open_stub (char *arg) +{ + nindy_open (arg, 1); + return 1; +} + +static void +nindy_load (char *filename, int from_tty) +{ + asection *s; + /* Can't do unix style forking on a VMS system, so we'll use bfd to do + all the work for us + */ + + bfd *file = bfd_openr (filename, 0); + if (!file) + { + perror_with_name (filename); + return; + } + + if (!bfd_check_format (file, bfd_object)) + { + error ("can't prove it's an object file\n"); + return; + } + + for (s = file->sections; s; s = s->next) + { + if (s->flags & SEC_LOAD) + { + char *buffer = xmalloc (s->_raw_size); + bfd_get_section_contents (file, s, buffer, 0, s->_raw_size); + printf ("Loading section %s, size %x vma %x\n", + s->name, + s->_raw_size, + s->vma); + ninMemPut (s->vma, buffer, s->_raw_size); + xfree (buffer); + } + } + bfd_close (file); +} + +static int +load_stub (char *arg) +{ + target_load (arg, 1); + return 1; +} + +/* This routine is run as a hook, just before the main command loop is + entered. If gdb is configured for the i960, but has not had its + nindy target specified yet, this will loop prompting the user to do so. + + Unlike the loop provided by Intel, we actually let the user get out + of this with a RETURN. This is useful when e.g. simply examining + an i960 object file on the host system. */ + +void +nindy_before_main_loop (void) +{ + char ttyname[100]; + char *p, *p2; + + while (target_stack->target_ops != &nindy_ops) /* What is this crap??? */ + { /* remote tty not specified yet */ + if (instream == stdin) + { + printf_unfiltered ("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: "); + gdb_flush (gdb_stdout); + } + fgets (ttyname, sizeof (ttyname) - 1, stdin); + + /* Strip leading and trailing whitespace */ + for (p = ttyname; isspace (*p); p++) + { + ; + } + if (*p == '\0') + { + return; /* User just hit spaces or return, wants out */ + } + for (p2 = p; !isspace (*p2) && (*p2 != '\0'); p2++) + { + ; + } + *p2 = '\0'; + if (STREQ ("quit", p)) + { + exit (1); + } + + if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL)) + { + /* Now that we have a tty open for talking to the remote machine, + download the executable file if one was specified. */ + if (exec_bfd) + { + catch_errors (load_stub, bfd_get_filename (exec_bfd), "", + RETURN_MASK_ALL); + } + } + } +} + +/* Define the target subroutine names */ + +struct target_ops nindy_ops; + +static void +init_nindy_ops (void) +{ + nindy_ops.to_shortname = "nindy"; + "Remote serial target in i960 NINDY-specific protocol", + nindy_ops.to_longname = "Use a remote i960 system running NINDY connected by a serial line.\n\ +Specify the name of the device the serial line is connected to.\n\ +The speed (baud rate), whether to use the old NINDY protocol,\n\ +and whether to send a break on startup, are controlled by options\n\ +specified when you started GDB."; + nindy_ops.to_doc = ""; + nindy_ops.to_open = nindy_open; + nindy_ops.to_close = nindy_close; + nindy_ops.to_attach = 0; + nindy_ops.to_post_attach = NULL; + nindy_ops.to_require_attach = NULL; + nindy_ops.to_detach = nindy_detach; + nindy_ops.to_require_detach = NULL; + nindy_ops.to_resume = nindy_resume; + nindy_ops.to_wait = nindy_wait; + nindy_ops.to_post_wait = NULL; + nindy_ops.to_fetch_registers = nindy_fetch_registers; + nindy_ops.to_store_registers = nindy_store_registers; + nindy_ops.to_prepare_to_store = nindy_prepare_to_store; + nindy_ops.to_xfer_memory = nindy_xfer_inferior_memory; + nindy_ops.to_files_info = nindy_files_info; + nindy_ops.to_insert_breakpoint = memory_insert_breakpoint; + nindy_ops.to_remove_breakpoint = memory_remove_breakpoint; + nindy_ops.to_terminal_init = 0; + nindy_ops.to_terminal_inferior = 0; + nindy_ops.to_terminal_ours_for_output = 0; + nindy_ops.to_terminal_ours = 0; + nindy_ops.to_terminal_info = 0; /* Terminal crud */ + nindy_ops.to_kill = nindy_kill; + nindy_ops.to_load = nindy_load; + nindy_ops.to_lookup_symbol = 0; /* lookup_symbol */ + nindy_ops.to_create_inferior = nindy_create_inferior; + nindy_ops.to_post_startup_inferior = NULL; + nindy_ops.to_acknowledge_created_inferior = NULL; + nindy_ops.to_clone_and_follow_inferior = NULL; + nindy_ops.to_post_follow_inferior_by_clone = NULL; + nindy_ops.to_insert_fork_catchpoint = NULL; + nindy_ops.to_remove_fork_catchpoint = NULL; + nindy_ops.to_insert_vfork_catchpoint = NULL; + nindy_ops.to_remove_vfork_catchpoint = NULL; + nindy_ops.to_has_forked = NULL; + nindy_ops.to_has_vforked = NULL; + nindy_ops.to_can_follow_vfork_prior_to_exec = NULL; + nindy_ops.to_post_follow_vfork = NULL; + nindy_ops.to_insert_exec_catchpoint = NULL; + nindy_ops.to_remove_exec_catchpoint = NULL; + nindy_ops.to_has_execd = NULL; + nindy_ops.to_reported_exec_events_per_exec_call = NULL; + nindy_ops.to_has_exited = NULL; + nindy_ops.to_mourn_inferior = nindy_mourn_inferior; + nindy_ops.to_can_run = 0; /* can_run */ + nindy_ops.to_notice_signals = 0; /* notice_signals */ + nindy_ops.to_thread_alive = 0; /* to_thread_alive */ + nindy_ops.to_stop = 0; /* to_stop */ + nindy_ops.to_pid_to_exec_file = NULL; + nindy_ops.to_stratum = process_stratum; + nindy_ops.DONT_USE = 0; /* next */ + nindy_ops.to_has_all_memory = 1; + nindy_ops.to_has_memory = 1; + nindy_ops.to_has_stack = 1; + nindy_ops.to_has_registers = 1; + nindy_ops.to_has_execution = 1; /* all mem, mem, stack, regs, exec */ + nindy_ops.to_sections = 0; + nindy_ops.to_sections_end = 0; /* Section pointers */ + nindy_ops.to_magic = OPS_MAGIC; /* Always the last thing */ +} + +void +_initialize_nindy (void) +{ + init_nindy_ops (); + add_target (&nindy_ops); + add_com ("reset", class_obscure, reset_command, + "Send a 'break' to the remote target system.\n\ +Only useful if the target has been equipped with a circuit\n\ +to perform a hard reset when a break is detected."); +} |