/* Remote debugging interface for boot monitors, for GDB. Copyright 1990, 1991, 1992, 1993, 1995 Free Software Foundation, Inc. Contributed by Cygnus Support. Written by Rob Savoye 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 various remote-* modules. It is a collection of generic support functions so GDB can talk directly to a ROM based monitor. This saves use from having to hack an exception based handler into existance, and makes for quick porting. This module talks to a debug monitor called 'MONITOR', which We communicate with MONITOR via either a direct serial line, or a TCP (or possibly TELNET) stream to a terminal multiplexor, which in turn talks to the target board. */ #include "defs.h" #include "gdbcore.h" #include "target.h" #include "wait.h" #include #include #include #include #include "command.h" #include "serial.h" #include "monitor.h" #include "gdbcmd.h" #include "inferior.h" static void monitor_command PARAMS ((char *args, int fromtty)); static void monitor_load_srec PARAMS ((char *args, int protocol)); static int getacknak PARAMS ((int byte)); static void make_xmodem_packet PARAMS ((unsigned char *packet, unsigned char *data, int len)); static void print_xmodem_packet PARAMS ((char *packet)); static void monitor_load_ascii_srec PARAMS ((char *file, int fromtty)); static int monitor_make_srec PARAMS ((char *buffer, int type, CORE_ADDR memaddr, unsigned char *myaddr, int len)); static void monitor_fetch_register PARAMS ((int regno)); static void monitor_store_register PARAMS ((int regno)); static int from_hex PARAMS ((int a)); static unsigned long get_hex_word PARAMS ((void)); static struct monitor_ops *current_monitor; static char *loadtype_str = "srec"; static char *loadproto_str = "none"; static int hashmark; /* flag set by "set hash" */ static int timeout = 30; static int expect PARAMS ((char *string, char *buf, int buflen)); static int expect_prompt PARAMS ((char *buf, int buflen)); /* Having this larger than 400 causes us to be incompatible with m68k-stub.c and i386-stub.c. Normally, no one would notice because it only matters for writing large chunks of memory (e.g. in downloads). Also, this needs to be more than 400 if required to hold the registers (see below, where we round it up based on REGISTER_BYTES). */ #define PBUFSIZ 400 /* Descriptor for I/O to remote machine. Initialize it to NULL so that monitor_open knows that we don't have a file open when the program starts. */ static serial_t monitor_desc = NULL; /* These definitions are for xmodem protocol. */ #define SOH 0x01 #define ACK 0x06 #define NAK 0x15 #define EOT 0x04 #define CANCEL 0x18 #define GETACK getacknak(ACK) #define GETNAK getacknak(NAK) #define XMODEM_DATASIZE 128 /* the data size is ALWAYS 128 */ #define XMODEM_PACKETSIZE 131 /* the packet size is ALWAYS 132 (zero based) */ #define XMODEM 1 static unsigned char output_buf[0x200]; static int obp; static void debug_save_output (buf, len) unsigned char *buf; int len; { #if 0 for (; len > 0; len--) output_buf[obp++ & 0x1ff] = *buf++; #else fputs_unfiltered (buf, gdb_stdout); #endif } static unsigned char input_buf[0x200]; static int ibp; static void debug_save_input_char (c) int c; { #if 0 input_buf[ibp++ & 0x1ff] = c; #else fputc_unfiltered (c, gdb_stdout); #endif } /* printf_monitor -- send data to monitor. Works just like printf. */ static void printf_monitor (va_alist) va_dcl { va_list args; char *pattern; char buf[PBUFSIZ]; va_start (args); pattern = va_arg (args, char *); vsprintf (buf, pattern, args); if (remote_debug > 0) debug_save_output (buf, strlen (buf)); if (strlen (buf) > PBUFSIZ) error ("printf_monitor(): string too long"); if (SERIAL_WRITE(monitor_desc, buf, strlen (buf))) fprintf_unfiltered (stderr, "SERIAL_WRITE failed: %s\n", safe_strerror (errno)); } /* Send raw data to monitor. */ static void write_monitor (data, len) char *data; int len; { if (SERIAL_WRITE (monitor_desc, data, len)) fprintf_unfiltered (stderr, "SERIAL_WRITE failed: %s\n", safe_strerror(errno)); *(data + len + 1) = '\0'; } /* Read a character from the remote system, doing all the fancy timeout stuff. */ static int readchar (timeout) int timeout; { int c; c = SERIAL_READCHAR (monitor_desc, timeout); if (remote_debug > 0) debug_save_input_char (c & 0x7f); if (c >= 0) return c & 0x7f; if (c == SERIAL_TIMEOUT) { if (timeout == 0) return c; /* Polls shouldn't generate timeout errors */ error ("Timeout reading from remote system."); } perror_with_name ("remote-monitor"); } /* Scan input from the remote system, until STRING is found. If BUF is non- zero, then collect input until either STRING has been collected or BUFLEN chars have been collected. If input overflows BUF because STRING can't be found, return -1, else return number of chars in BUF (including STRING). */ static int expect (string, buf, buflen) char *string; char *buf; int buflen; { char *p = string; int obuflen = buflen; int c; immediate_quit = 1; while (1) { if (buf) { if (buflen <= 0) { immediate_quit = 0; return -1; } c = readchar (timeout); *buf++ = c; buflen--; } else c = readchar (timeout); if (c == *p++) { if (*p == '\0') { immediate_quit = 0; return obuflen - buflen; } } else { p = string; if (c == *p) p++; } } } /* Keep discarding input until we see the MONITOR 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: monitor_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 monitor_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 int expect_prompt (buf, buflen) char *buf; int buflen; { return expect (PROMPT, buf, buflen); } /* Get N 32-bit words from remote, each preceded by a space, and put them in registers starting at REGNO. */ static unsigned long get_hex_word () { unsigned long val; int i; int ch; do ch = readchar (timeout); while (isspace(ch)); val = from_hex (ch); for (i = 7; i >= 1; i--) { ch = readchar (timeout); if (!isxdigit (ch)) break; val = (val << 4) | from_hex (ch); } return val; } /* Open a connection to a remote debugger. NAME is the filename used for communication. */ static char *dev_name; static struct target_ops *targ_ops; void monitor_open (args, mon_ops, from_tty) char *args; struct monitor_ops *mon_ops; int from_tty; { char *name; int i; targ_ops = mon_ops->target; name = targ_ops->to_shortname; if (!args) error ("Use `target %s DEVICE-NAME' to use a serial port, or \n\ `target %s HOST-NAME:PORT-NUMBER' to use a network connection.", name, name); target_preopen (from_tty); unpush_target (targ_ops); if (dev_name) free (dev_name); dev_name = strsave (args); monitor_desc = SERIAL_OPEN (dev_name); if (!monitor_desc) perror_with_name (dev_name); if (baud_rate != -1) { if (SERIAL_SETBAUDRATE (monitor_desc, baud_rate)) { SERIAL_CLOSE (monitor_desc); perror_with_name (dev_name); } } SERIAL_RAW (monitor_desc); SERIAL_FLUSH_INPUT (monitor_desc); /* some systems only work with 2 stop bits */ SERIAL_SETSTOPBITS (monitor_desc, mon_ops->stopbits); current_monitor = mon_ops; /* see if the target is alive. For a ROM monitor, we can just try to force the prompt to print a few times. */ /* wake up the monitor and see if it's alive */ printf_monitor (mon_ops->init); expect_prompt (NULL, 0); /* See if we get a prompt */ /* try again to be sure */ printf_monitor (mon_ops->init); expect_prompt (NULL, 0); /* See if we get a prompt */ /* Setup the suffixes for the `set remoteloadtype' command */ add_show_from_set (add_set_enum_cmd ("remoteloadtype", no_class, mon_ops->loadtypes, (char *)&loadtype_str, "Set the remote load type.", &setlist), &showlist); /* Setup the suffixes for the `set remoteloadprotocol' command */ add_show_from_set (add_set_enum_cmd ("remoteloadprotocol", no_class, mon_ops->loadprotos, (char *)&loadproto_str, "Set the remote load protocol.", &setlist), &showlist); if (from_tty) printf_unfiltered ("Remote target %s connected to %s\n", name, dev_name); push_target (targ_ops); inferior_pid = 42000; /* Make run command think we are busy... */ printf_monitor ("\r"); start_remote (); } /* Close out all files and local state before this target loses control. */ void monitor_close (quitting) int quitting; { if (monitor_desc) SERIAL_CLOSE (monitor_desc); monitor_desc = NULL; } /* Terminate the open connection to the remote debugger. Use this when you want to detach and do something else with your gdb. */ void monitor_detach (args, from_tty) char *args; int from_tty; { pop_target (); /* calls monitor_close to do the real work */ if (from_tty) printf_unfiltered ("Ending remote %s debugging\n", target_shortname); } /* Tell the remote machine to resume. */ void monitor_resume (pid, step, sig) int pid, step; enum target_signal sig; { if (step) printf_monitor (STEP_CMD); else printf_monitor (CONT_CMD); } /* Wait until the remote machine stops, then return, storing status in status just as `wait' would. */ int monitor_wait (pid, status) int pid; struct target_waitstatus *status; { int old_timeout = timeout; status->kind = TARGET_WAITKIND_EXITED; status->value.integer = 0; timeout = -1; /* Don't time out -- user program is running. */ expect_prompt (NULL, 0); /* Wait for prompt, outputting extraneous text */ status->kind = TARGET_WAITKIND_STOPPED; status->value.sig = TARGET_SIGNAL_TRAP; timeout = old_timeout; return inferior_pid; } /* Fetch register REGNO, or all registers if REGNO is -1. Returns errno value. */ static void monitor_fetch_register (regno) int regno; { unsigned LONGEST val; unsigned char regbuf[MAX_REGISTER_RAW_SIZE]; char buf[200]; char *p, *p1; char *name; int resp_len; name = REGNAMES (regno); if (!name) return; /* send the register examine command */ printf_monitor (current_monitor->getreg.cmd, name); /* If TERM is present, we wait for that to show up. Also, (if TERM is present), we will send TERM_CMD if that is present. In any case, we collect all of the output into buf, and then wait for the normal prompt. */ if (current_monitor->getreg.term) { resp_len = expect (current_monitor->getreg.term, buf, sizeof buf); /* get response */ if (resp_len <= 0) error ("monitor_fetch_register (%d): excessive response from monitor: %.*s.", regno, resp_len, buf); if (current_monitor->getreg.term_cmd) { SERIAL_WRITE (monitor_desc, current_monitor->getreg.term_cmd, strlen (current_monitor->getreg.term_cmd)); expect_prompt (NULL, 0); } } else resp_len = expect_prompt (buf, sizeof buf); /* get response */ /* If RESP_DELIM is specified, we search for that as a leading delimiter for the register value. Otherwise, we just start searching from the start of the buf. */ if (current_monitor->getreg.resp_delim) { p = strstr (buf, current_monitor->getreg.resp_delim); if (!p) error ("monitor_fetch_register (%d): bad response from monitor: %.*s.", regno, resp_len, buf); p += strlen (current_monitor->getreg.resp_delim); } else p = buf; val = strtoul (p, &p1, 16); if (val == 0 && p == p1) error ("monitor_fetch_register (%d): bad value from monitor: %.*s.", regno, resp_len, buf); /* supply register stores in target byte order, so swap here */ store_unsigned_integer (regbuf, REGISTER_RAW_SIZE (regno), val); supply_register (regno, regbuf); } /* Read the remote registers into the block regs. */ void monitor_fetch_registers (regno) int regno; { if (regno >= 0) { monitor_fetch_register (regno); return; } for (regno = 0; regno < NUM_REGS; regno++) monitor_fetch_register (regno); } /* Store register REGNO, or all if REGNO == 0. Return errno value. */ static void monitor_store_register (regno) int regno; { char *name; unsigned LONGEST val; name = REGNAMES (regno); if (!name) return; val = read_register (regno); /* send the register deposit command */ printf_monitor (current_monitor->setreg.cmd, name, val); /* It's possible that there are actually some monitors out there that will prompt you when you set a register. In that case, you may need to add some code here to deal with TERM and TERM_CMD (see monitor_fetch_register to get an idea of what's needed...) */ expect_prompt (NULL, 0); } /* Store the remote registers. */ void monitor_store_registers (regno) int regno; { if (regno >= 0) { monitor_store_register (regno); return; } for (regno = 0; regno < NUM_REGS; regno++) monitor_store_register (regno); } /* 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. */ void monitor_prepare_to_store () { /* Do nothing, since we can store individual regs */ } void monitor_files_info () { printf_unfiltered ("\tAttached to %s at %d baud.\n", dev_name, baud_rate); } static int monitor_write_memory (memaddr, myaddr, len) CORE_ADDR memaddr; unsigned char *myaddr; int len; { /* send the memory deposit command */ printf_monitor (current_monitor->setmem.cmd, memaddr, *myaddr); /* It's possible that there are actually some monitors out there that will prompt you when you deposit to memory. In that case, you may need to add some code here to deal with TERM and TERM_CMD (see monitor_read_memory to get an idea of what's needed...) */ expect_prompt (NULL, 0); return 1; } /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's memory at MEMADDR. Returns length moved. Currently, we only do one byte at a time. */ static int monitor_read_memory (memaddr, myaddr, len) CORE_ADDR memaddr; char *myaddr; int len; { unsigned LONGEST val; unsigned char regbuf[MAX_REGISTER_RAW_SIZE]; char buf[200]; char *p, *p1; char *name; int resp_len; /* send the memory examine command */ printf_monitor (current_monitor->getmem.cmd, memaddr); /* If TERM is present, we wait for that to show up. Also, (if TERM is present), we will send TERM_CMD if that is present. In any case, we collect all of the output into buf, and then wait for the normal prompt. */ if (current_monitor->getmem.term) { resp_len = expect (current_monitor->getmem.term, buf, sizeof buf); /* get response */ if (resp_len <= 0) error ("monitor_read_memory (0x%x): excessive response from monitor: %.*s.", memaddr, resp_len, buf); if (current_monitor->getmem.term_cmd) { SERIAL_WRITE (monitor_desc, current_monitor->getmem.term_cmd, strlen (current_monitor->getmem.term_cmd)); expect_prompt (NULL, 0); } } else resp_len = expect_prompt (buf, sizeof buf); /* get response */ /* If RESP_DELIM is specified, we search for that as a leading delimiter for the register value. Otherwise, we just start searching from the start of the buf. */ if (current_monitor->getmem.resp_delim) { p = strstr (buf, current_monitor->getmem.resp_delim); if (!p) error ("monitor_read_memory (0x%x): bad response from monitor: %.*s.", memaddr, resp_len, buf); p += strlen (current_monitor->getmem.resp_delim); } else p = buf; val = strtoul (p, &p1, 16); if (val == 0 && p == p1) error ("monitor_read_memory (0x%x): bad value from monitor: %.*s.", memaddr, resp_len, buf); *myaddr = val; return 1; /* Got 1 byte */ } /* FIXME-someday! merge these two. */ int monitor_xfer_memory (memaddr, myaddr, len, write, target) CORE_ADDR memaddr; char *myaddr; int len; int write; struct target_ops *target; /* ignored */ { if (write) return monitor_write_memory (memaddr, myaddr, len); else return monitor_read_memory (memaddr, myaddr, len); } void monitor_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. */ void monitor_mourn_inferior () { unpush_target (targ_ops); generic_mourn_inferior (); /* Do all the proper things now */ } #define NUM_MONITOR_BREAKPOINTS 8 static CORE_ADDR breakaddr[NUM_MONITOR_BREAKPOINTS] = {0}; /* Tell the monitor to add a breakpoint. */ int monitor_insert_breakpoint (addr, shadow) CORE_ADDR addr; char *shadow; { int i; static unsigned char break_insn[] = BREAKPOINT; for (i = 0; i < NUM_MONITOR_BREAKPOINTS; i++) { if (breakaddr[i] == 0) { breakaddr[i] = addr; monitor_read_memory (addr, shadow, sizeof (break_insn)); printf_monitor (SET_BREAK_CMD, addr); expect_prompt (NULL, 0); return 0; } } error ("Too many breakpoints (> %d) for monitor.", NUM_MONITOR_BREAKPOINTS); } /* Tell the monitor to remove a breakpoint. */ int monitor_remove_breakpoint (addr, shadow) CORE_ADDR addr; char *shadow; { int i; for (i = 0; i < NUM_MONITOR_BREAKPOINTS; i++) { if (breakaddr[i] == addr) { breakaddr[i] = 0; /* some monitors remove breakpoints based on the address */ if (CLR_BREAK_ADDR) printf_monitor(CLR_BREAK_CMD, addr); else printf_monitor(CLR_BREAK_CMD, i); expect_prompt (NULL, 0); return 0; } } fprintf_unfiltered (stderr, "Can't find breakpoint associated with 0x%x\n", addr); return 1; } /* monitor_load -- load a file. This file determines which of the * supported formats to use. The current types are: * FIXME: not all types supported yet. * default - reads any file using bfd and writes it to memory. This * is really slow. * srec - reads binary file using bfd and writes it as an * ascii srecord. * xmodem-bin - reads a binary file using bfd, and downloads it * using xmodem protocol. * xmodem-srec - reads a binary file using bfd, and after converting * it downloads it as an srecord using xmodem protocol. * ascii-srec - reads a ascii srecord file and downloads it * without a change. * ascii-xmodem - reads a ascii file and downloads using xmodem * protocol. */ void monitor_load (file, fromtty) char *file; int fromtty; { /* default, load a binary */ if (STREQ (loadtype_str, "default")) { error ("default load type not supported."); } /* load an srecord by converting */ if ((STREQ (loadtype_str, "srec")) && STREQ (loadproto_str, "xmodem")) { monitor_load_srec (file, XMODEM); return; } /* load an srecord by converting */ if (STREQ (loadtype_str, "srec")) { monitor_load_srec (file, 0); /* if from a binary */ return; } /* load an srecord by converting */ if (STREQ (loadtype_str, "none")) { error ("Unimplemented"); return; } /* load an srecord file */ if (STREQ (loadproto_str, "none")) { monitor_load_ascii_srec (file, fromtty); /* if from a binary */ return; } if (STREQ (loadproto_str, "xmodem")) { monitor_load_srec (file, XMODEM); return; } } /* Download an ASCII srecord file. */ #define DOWNLOAD_LINE_SIZE 100 static void monitor_load_ascii_srec (file, fromtty) char *file; int fromtty; { FILE *download; char buf[DOWNLOAD_LINE_SIZE]; int i, bytes_read; download = fopen (file, "r"); if (download == NULL) { error ("%s does not exist", file); return; } printf_monitor (LOAD_CMD); sleep (1); while (!feof (download)) { bytes_read = fread (buf, sizeof (char), DOWNLOAD_LINE_SIZE, download); if (hashmark) { putchar_unfiltered ('.'); gdb_flush (gdb_stdout); } if (SERIAL_WRITE (monitor_desc, buf, bytes_read)) { fprintf_unfiltered (stderr, "SERIAL_WRITE failed: (while downloading) %s\n", safe_strerror (errno)); break; } i = 0; while (i++ <=200) {} ; /* Ugly HACK, probably needs flow control */ if (bytes_read < DOWNLOAD_LINE_SIZE) { if (!feof (download)) error ("Only read %d bytes\n", bytes_read); break; } } if (hashmark) putchar_unfiltered ('\n'); if (!feof (download)) error ("Never got EOF while downloading"); expect_prompt (NULL, 0); fclose (download); } /* Put a command string, in args, out to MONITOR. Output from MONITOR is placed on the users terminal until the prompt is seen. FIXME: We read the characters ourseleves here cause of a nasty echo. */ static void monitor_command (args, fromtty) char *args; int fromtty; { char *p; p = PROMPT; if (monitor_desc == NULL) error ("monitor target not open."); /* Send the command. Note that if no args were supplied, then we're just sending the monitor a newline, which is sometimes useful. */ printf_monitor ("%s\n", (args ? args : "")); expect_prompt (NULL, 0); } /* Download a binary file by converting it to srecords. This will also use xmodem to download the resulting file. A download goes like this when using xmodem: Receiver: Sender NAK ----------> <-------- (packet) [SOH|1|1|data|SUM] ACK ----------> <-------- (packet) [SOH|2|2|data|SUM] ACK ----------> <-------- EOT ACK ----------> ACK = 0x06 NAK = 0x15 EOT = 0x04 */ static void monitor_load_srec (args, protocol) char *args; int protocol; { bfd *abfd; asection *s; char *buffer, srec[1024]; char packet[XMODEM_PACKETSIZE]; int i; int retries; int type = 0; /* default to a type 0, header record */ int srec_frame = 57; /* FIXME: this must be 57 There is 12 bytes of header, and 2 bytes of checksum at the end. The problem is an xmodem packet holds exactly 128 bytes. */ abfd = bfd_openr (args, 0); if (!abfd) { printf_filtered ("Unable to open file %s\n", args); return; } if (bfd_check_format (abfd, bfd_object) == 0) { printf_filtered ("File is not an object file\n"); return; } printf_monitor (LOAD_CMD); /* tell the monitor to load */ sleep (3); /* get the NAK from the target */ if (protocol == XMODEM) { if (!GETNAK) { printf_monitor ("%c", EOT); error ("Never got the NAK to start loading"); } } s = abfd->sections; while (s != (asection *) NULL) { if (s->flags & SEC_LOAD) { buffer = xmalloc (srec_frame); printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, s->vma + s->_raw_size); gdb_flush (gdb_stdout); for (i = 0; i < s->_raw_size; i += srec_frame) { if (srec_frame > s->_raw_size - i) srec_frame = s->_raw_size - i; bfd_get_section_contents (abfd, s, buffer, i, srec_frame); monitor_make_srec (srec, type, s->vma + i, buffer, srec_frame); /* send a packet using xmodem */ if (protocol == XMODEM) { make_xmodem_packet (packet, srec, XMODEM_DATASIZE); write_monitor (packet, XMODEM_PACKETSIZE+1); retries = 0; while (retries++ <= 3) { /* Resend packet */ if (GETNAK) { sleep (1); /* send it again */ write_monitor (packet, XMODEM_PACKETSIZE+1); if (GETACK) /* ACKnowledged, get next data chunk */ break; } else { /* assume we got an ACK */ if (hashmark) { putchar_unfiltered ('#'); gdb_flush (gdb_stdout); } break; } } if (retries >= 4) { /* too many tries, must be hosed */ printf_monitor ("%c", EOT); error ("Never got a ACK after sending an xmodem packet"); } } else { /* no protocols at all */ printf_monitor ("%s\n", srec); } if (hashmark) { putchar_unfiltered ('#'); gdb_flush (gdb_stdout); } type = 3; /* switch to a 4 byte address record */ gdb_flush (gdb_stdout); } free (buffer); } s = s->next; } putchar_unfiltered ('\n'); /* Write a type 7 terminator record. no data for a type 7, and there is no data, so len is 0. */ if (protocol == XMODEM) { /* send a packet using xmodem */ monitor_make_srec (srec, 7, abfd->start_address, "", 0); make_xmodem_packet (packet, srec, XMODEM_DATASIZE); write_monitor (packet, XMODEM_PACKETSIZE+1); } else { monitor_make_srec (srec, 7, abfd->start_address, "", 0); printf_monitor ("%s\n", srec); } if (protocol == XMODEM) { printf_monitor ("%c", EOT); if (!GETACK) error ("Never got ACK after sending EOT"); } if (hashmark) putchar_unfiltered ('\n'); expect_prompt (NULL, 0); /* Finally, make the PC point at the start address */ write_register (PC_REGNUM, bfd_get_start_address (abfd)); } /* Get an ACK or a NAK from the target. returns 1 (true) or 0 (false) This is for xmodem. ANy string starting with "***" is an error message from the target. Here's a few from the WinBond w89k "Cougar" PA board: *** Too many errors found. *** Bad command *** Command syntax error */ static int getacknak (byte) int byte; { char character; int i; i = 0; while (i++ < 60) { character = (char) readchar (0); if ((character == 0xfffffffe) || (character == 0x7f)) { /* empty uart */ sleep (1); continue; } if (character == CANCEL) { /* target aborted load */ expect_prompt (NULL, 0); error ("Got a CANCEL from the target."); } if (character == '*') { /* look for missed error message */ expect_prompt (NULL, 0); error ("Got an error message from the target"); } if (character == byte) /* got what we wanted */ return 1; if (character == ((byte == ACK) ? NAK : ACK)) return 0; sleep (1); } return 0; } /* * monitor_make_srec -- make an srecord. This writes each line, one at a * time, each with it's own header and trailer line. * An srecord looks like this: * * byte count-+ address * start ---+ | | data +- checksum * | | | | * S01000006F6B692D746573742E73726563E4 * S315000448600000000000000000FC00005900000000E9 * S31A0004000023C1400037DE00F023604000377B009020825000348D * S30B0004485A0000000000004E * S70500040000F6 * * S
* * Where * - length * is the number of bytes following upto the checksum. Note that * this is not the number of chars following, since it takes two * chars to represent a byte. * - type * is one of: * 0) header record * 1) two byte address data record * 2) three byte address data record * 3) four byte address data record * 7) four byte address termination record * 8) three byte address termination record * 9) two byte address termination record * * - address * is the start address of the data following, or in the case of * a termination record, the start address of the image * - data * is the data. * - checksum * is the sum of all the raw byte data in the record, from the length * upwards, modulo 256 and subtracted from 255. */ static int monitor_make_srec (buffer, type, memaddr, myaddr, len) char *buffer; int type; CORE_ADDR memaddr; unsigned char *myaddr; int len; { int checksum; int i; char *buf; buf = buffer; checksum = 0; /* Create the header for the srec. 4 is the number of bytes in the address, and 1 is the number of bytes in the count. */ if (type == 0) /* FIXME: type 0 is optional */ type = 3; /* so use data as it works */ sprintf (buf, "S%d%02X%08X", type, len + 4 + 1, memaddr); buf += 12; checksum += (len + 4 + 1 /* calculate the checksum */ + (memaddr & 0xff) + ((memaddr >> 8) & 0xff) + ((memaddr >> 16) & 0xff) + ((memaddr >> 24) & 0xff)); /* build the srecord */ for (i = 0; i < len; i++) { sprintf (buf, "%02X", myaddr[i]); checksum += myaddr[i]; buf += 2; } sprintf(buf, "%02X", ~checksum & 0xff); /* add the checksum */ return 0; } /* Take 128 bytes of data and make a packet out of it. * * Each packet looks like this: * +-----+-------+-------+------+-----+ * | SOH | Seq1. | Seq2. | data | SUM | * +-----+-------+-------+------+-----+ * SOH = 0x01 * Seq1 = The sequence number. * Seq2 = The complement of the sequence number. * Data = A 128 bytes of data. * SUM = Add the contents of the 128 bytes and use the low-order * 8 bits of the result. */ static void make_xmodem_packet (packet, data, len) unsigned char *packet; unsigned char *data; int len; { static int sequence = 1; int i, sum; unsigned char *buf; buf = data; /* build the packet header */ packet[0] = SOH; packet[1] = sequence; packet[2] = 255 - sequence; sequence++; #if 0 packet[2] = ~sequence++; /* the complement is the sequence checksum */ #endif sum = 0; /* calculate the data checksum */ for (i = 3; i <= len + 2; i++) { packet[i] = *buf; sum += *buf; buf++; } /* add padding for the rest of the packet */ for (i = len+1 ; i <= XMODEM_DATASIZE ; i++) packet[i] = '0'; packet[XMODEM_PACKETSIZE] = sum & 0xff; /* add the checksum */ } /* Print the packet as a debug check. */ static void print_xmodem_packet (packet) char *packet; { int i; static int lastseq; int sum; /* take apart the packet header the packet header */ if (packet[0] == SOH) printf_unfiltered ("SOH"); else error ("xmodem: SOH is wrong"); /* check the sequence */ if (packet[1] != 0) { lastseq = packet[1]; if (packet[2] != ~lastseq) error ("xmodem: Sequence checksum is wrong"); else printf_filtered (" %d %d", lastseq, ~lastseq); } /* check the data checksum */ sum = 0; for (i = 3; i <= XMODEM_DATASIZE; i++) sum += packet[i]; /* ignore the data */ #if 0 printf_unfiltered (" [128 bytes of data] %d\n", sum & 0xff); #endif printf_filtered (" [%s] %d\n", packet, sum & 0xff); if ((packet[XMODEM_PACKETSIZE] & 0xff) != (sum & 0xff)) printf_unfiltered ("xmodem: data checksum wrong, got a %d", packet[XMODEM_PACKETSIZE] & 0xff); putchar_unfiltered ('\n'); } /* Convert hex digit A to a number. */ static int from_hex (a) int a; { if (a >= '0' && a <= '9') return a - '0'; if (a >= 'a' && a <= 'f') return a - 'a' + 10; if (a >= 'A' && a <= 'F') return a - 'A' + 10; error ("Reply contains invalid hex digit 0x%x", a); } /* Define additional commands that are usually only used by monitors. */ void _initialize_remote_monitors () { add_show_from_set (add_set_cmd ("hash", no_class, var_boolean, (char *)&hashmark, "Set display of activity while downloading a file.\n\ When enabled, a hashmark \'#\' is displayed.", &setlist), &showlist); add_com ("monitor", class_obscure, monitor_command, "Send a command to the debug monitor."); }