| /* Remote target communications for serial-line targets using SDS' protocol. |
| |
| Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2004 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. */ |
| |
| /* This interface was written by studying the behavior of the SDS |
| monitor on an ADS 821/860 board, and by consulting the |
| documentation of the monitor that is available on Motorola's web |
| site. -sts 8/13/97 */ |
| |
| #include "defs.h" |
| #include "gdb_string.h" |
| #include <fcntl.h> |
| #include "frame.h" |
| #include "inferior.h" |
| #include "exceptions.h" |
| #include "bfd.h" |
| #include "symfile.h" |
| #include "target.h" |
| #include "gdbcmd.h" |
| #include "objfiles.h" |
| #include "gdb-stabs.h" |
| #include "gdbthread.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| |
| #include <signal.h> |
| #include "serial.h" |
| |
| extern void _initialize_remote_sds (void); |
| |
| /* Declarations of local functions. */ |
| |
| static int sds_write_bytes (CORE_ADDR, char *, int); |
| |
| static int sds_read_bytes (CORE_ADDR, char *, int); |
| |
| static void sds_files_info (struct target_ops *ignore); |
| |
| static int sds_xfer_memory (CORE_ADDR, char *, int, int, |
| struct mem_attrib *, struct target_ops *); |
| |
| static void sds_prepare_to_store (void); |
| |
| static void sds_fetch_registers (int); |
| |
| static void sds_resume (ptid_t, int, enum target_signal); |
| |
| static int sds_start_remote (void *); |
| |
| static void sds_open (char *, int); |
| |
| static void sds_close (int); |
| |
| static void sds_store_registers (int); |
| |
| static void sds_mourn (void); |
| |
| static void sds_load (char *, int); |
| |
| static int getmessage (unsigned char *, int); |
| |
| static int putmessage (unsigned char *, int); |
| |
| static int sds_send (unsigned char *, int); |
| |
| static int readchar (int); |
| |
| static ptid_t sds_wait (ptid_t, struct target_waitstatus *); |
| |
| static void sds_kill (void); |
| |
| static int fromhex (int); |
| |
| static void sds_detach (char *, int); |
| |
| static void sds_interrupt (int); |
| |
| static void sds_interrupt_twice (int); |
| |
| static void interrupt_query (void); |
| |
| static int read_frame (char *); |
| |
| static int sds_insert_breakpoint (CORE_ADDR, char *); |
| |
| static int sds_remove_breakpoint (CORE_ADDR, char *); |
| |
| static void init_sds_ops (void); |
| |
| static void sds_command (char *args, int from_tty); |
| |
| /* Define the target operations vector. */ |
| |
| static struct target_ops sds_ops; |
| |
| /* This was 5 seconds, which is a long time to sit and wait. |
| Unless this is going though some terminal server or multiplexer or |
| other form of hairy serial connection, I would think 2 seconds would |
| be plenty. */ |
| |
| static int sds_timeout = 2; |
| |
| /* Descriptor for I/O to remote machine. Initialize it to NULL so |
| that sds_open knows that we don't have a file open when the program |
| starts. */ |
| |
| static struct serial *sds_desc = NULL; |
| |
| /* This limit comes from the monitor. */ |
| |
| #define PBUFSIZ 250 |
| |
| /* Maximum number of bytes to read/write at once. The value here |
| is chosen to fill up a packet (the headers account for the 32). */ |
| #define MAXBUFBYTES ((PBUFSIZ-32)/2) |
| |
| static int next_msg_id; |
| |
| static int just_started; |
| |
| static int message_pending; |
| |
| |
| /* Clean up connection to a remote debugger. */ |
| |
| static void |
| sds_close (int quitting) |
| { |
| if (sds_desc) |
| serial_close (sds_desc); |
| sds_desc = NULL; |
| } |
| |
| /* Stub for catch_errors. */ |
| |
| static int |
| sds_start_remote (void *dummy) |
| { |
| int c; |
| unsigned char buf[200]; |
| |
| immediate_quit++; /* Allow user to interrupt it */ |
| |
| /* Ack any packet which the remote side has already sent. */ |
| serial_write (sds_desc, "{#*\r\n", 5); |
| serial_write (sds_desc, "{#}\r\n", 5); |
| |
| while ((c = readchar (1)) >= 0) |
| printf_unfiltered ("%c", c); |
| printf_unfiltered ("\n"); |
| |
| next_msg_id = 251; |
| |
| buf[0] = 26; |
| sds_send (buf, 1); |
| |
| buf[0] = 0; |
| sds_send (buf, 1); |
| |
| immediate_quit--; |
| |
| start_remote (); /* Initialize gdb process mechanisms */ |
| return 1; |
| } |
| |
| /* Open a connection to a remote debugger. |
| NAME is the filename used for communication. */ |
| |
| static void |
| sds_open (char *name, int from_tty) |
| { |
| if (name == 0) |
| error ("To open a remote debug connection, you need to specify what serial\n\ |
| device is attached to the remote system (e.g. /dev/ttya)."); |
| |
| target_preopen (from_tty); |
| |
| unpush_target (&sds_ops); |
| |
| sds_desc = serial_open (name); |
| if (!sds_desc) |
| perror_with_name (name); |
| |
| if (baud_rate != -1) |
| { |
| if (serial_setbaudrate (sds_desc, baud_rate)) |
| { |
| serial_close (sds_desc); |
| perror_with_name (name); |
| } |
| } |
| |
| |
| serial_raw (sds_desc); |
| |
| /* If there is something sitting in the buffer we might take it as a |
| response to a command, which would be bad. */ |
| serial_flush_input (sds_desc); |
| |
| if (from_tty) |
| { |
| puts_filtered ("Remote debugging using "); |
| puts_filtered (name); |
| puts_filtered ("\n"); |
| } |
| push_target (&sds_ops); /* Switch to using remote target now */ |
| |
| just_started = 1; |
| |
| /* Start the remote connection; if error (0), discard this target. |
| In particular, if the user quits, be sure to discard it (we'd be |
| in an inconsistent state otherwise). */ |
| if (!catch_errors (sds_start_remote, NULL, |
| "Couldn't establish connection to remote target\n", |
| RETURN_MASK_ALL)) |
| pop_target (); |
| } |
| |
| /* This takes a program previously attached to and detaches it. After |
| this is done, GDB can be used to debug some other program. We |
| better not have left any breakpoints in the target program or it'll |
| die when it hits one. */ |
| |
| static void |
| sds_detach (char *args, int from_tty) |
| { |
| char buf[PBUFSIZ]; |
| |
| if (args) |
| error ("Argument given to \"detach\" when remotely debugging."); |
| |
| #if 0 |
| /* Tell the remote target to detach. */ |
| strcpy (buf, "D"); |
| sds_send (buf, 1); |
| #endif |
| |
| pop_target (); |
| if (from_tty) |
| puts_filtered ("Ending remote debugging.\n"); |
| } |
| |
| /* Convert hex digit A to a number. */ |
| |
| static int |
| fromhex (int a) |
| { |
| if (a >= '0' && a <= '9') |
| return a - '0'; |
| else if (a >= 'a' && a <= 'f') |
| return a - 'a' + 10; |
| else |
| error ("Reply contains invalid hex digit %d", a); |
| } |
| |
| static int |
| tob64 (unsigned char *inbuf, char *outbuf, int len) |
| { |
| int i, sum; |
| char *p; |
| |
| if (len % 3 != 0) |
| error ("bad length"); |
| |
| p = outbuf; |
| for (i = 0; i < len; i += 3) |
| { |
| /* Collect the next three bytes into a number. */ |
| sum = ((long) *inbuf++) << 16; |
| sum |= ((long) *inbuf++) << 8; |
| sum |= ((long) *inbuf++); |
| |
| /* Spit out 4 6-bit encodings. */ |
| *p++ = ((sum >> 18) & 0x3f) + '0'; |
| *p++ = ((sum >> 12) & 0x3f) + '0'; |
| *p++ = ((sum >> 6) & 0x3f) + '0'; |
| *p++ = (sum & 0x3f) + '0'; |
| } |
| return (p - outbuf); |
| } |
| |
| static int |
| fromb64 (char *inbuf, char *outbuf, int len) |
| { |
| int i, sum; |
| |
| if (len % 4 != 0) |
| error ("bad length"); |
| |
| for (i = 0; i < len; i += 4) |
| { |
| /* Collect 4 6-bit digits. */ |
| sum = (*inbuf++ - '0') << 18; |
| sum |= (*inbuf++ - '0') << 12; |
| sum |= (*inbuf++ - '0') << 6; |
| sum |= (*inbuf++ - '0'); |
| |
| /* Now take the resulting 24-bit number and get three bytes out |
| of it. */ |
| *outbuf++ = (sum >> 16) & 0xff; |
| *outbuf++ = (sum >> 8) & 0xff; |
| *outbuf++ = sum & 0xff; |
| } |
| |
| return (len / 4) * 3; |
| } |
| |
| |
| /* Tell the remote machine to resume. */ |
| |
| static enum target_signal last_sent_signal = TARGET_SIGNAL_0; |
| int last_sent_step; |
| |
| static void |
| sds_resume (ptid_t ptid, int step, enum target_signal siggnal) |
| { |
| unsigned char buf[PBUFSIZ]; |
| |
| last_sent_signal = siggnal; |
| last_sent_step = step; |
| |
| buf[0] = (step ? 21 : 20); |
| buf[1] = 0; /* (should be signal?) */ |
| |
| sds_send (buf, 2); |
| } |
| |
| /* Send a message to target to halt it. Target will respond, and send |
| us a message pending notice. */ |
| |
| static void |
| sds_interrupt (int signo) |
| { |
| unsigned char buf[PBUFSIZ]; |
| |
| /* If this doesn't work, try more severe steps. */ |
| signal (signo, sds_interrupt_twice); |
| |
| if (remote_debug) |
| fprintf_unfiltered (gdb_stdlog, "sds_interrupt called\n"); |
| |
| buf[0] = 25; |
| sds_send (buf, 1); |
| } |
| |
| static void (*ofunc) (); |
| |
| /* The user typed ^C twice. */ |
| |
| static void |
| sds_interrupt_twice (int signo) |
| { |
| signal (signo, ofunc); |
| |
| interrupt_query (); |
| |
| signal (signo, sds_interrupt); |
| } |
| |
| /* Ask the user what to do when an interrupt is received. */ |
| |
| static void |
| interrupt_query (void) |
| { |
| target_terminal_ours (); |
| |
| if (query ("Interrupted while waiting for the program.\n\ |
| Give up (and stop debugging it)? ")) |
| { |
| target_mourn_inferior (); |
| deprecated_throw_reason (RETURN_QUIT); |
| } |
| |
| target_terminal_inferior (); |
| } |
| |
| /* If nonzero, ignore the next kill. */ |
| int kill_kludge; |
| |
| /* Wait until the remote machine stops, then return, storing status in |
| STATUS just as `wait' would. Returns "pid" (though it's not clear |
| what, if anything, that means in the case of this target). */ |
| |
| static ptid_t |
| sds_wait (ptid_t ptid, struct target_waitstatus *status) |
| { |
| unsigned char buf[PBUFSIZ]; |
| int retlen; |
| |
| status->kind = TARGET_WAITKIND_EXITED; |
| status->value.integer = 0; |
| |
| ofunc = (void (*)()) signal (SIGINT, sds_interrupt); |
| |
| signal (SIGINT, ofunc); |
| |
| if (just_started) |
| { |
| just_started = 0; |
| status->kind = TARGET_WAITKIND_STOPPED; |
| return inferior_ptid; |
| } |
| |
| while (1) |
| { |
| getmessage (buf, 1); |
| |
| if (message_pending) |
| { |
| buf[0] = 26; |
| retlen = sds_send (buf, 1); |
| if (remote_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Signals: %02x%02x %02x %02x\n", |
| buf[0], buf[1], |
| buf[2], buf[3]); |
| } |
| message_pending = 0; |
| status->kind = TARGET_WAITKIND_STOPPED; |
| status->value.sig = TARGET_SIGNAL_TRAP; |
| goto got_status; |
| } |
| } |
| got_status: |
| return inferior_ptid; |
| } |
| |
| static unsigned char sprs[16]; |
| |
| /* Read the remote registers into the block REGS. */ |
| /* Currently we just read all the registers, so we don't use regno. */ |
| |
| static void |
| sds_fetch_registers (int regno) |
| { |
| unsigned char buf[PBUFSIZ]; |
| int i, retlen; |
| char *regs = alloca (deprecated_register_bytes ()); |
| |
| /* Unimplemented registers read as all bits zero. */ |
| memset (regs, 0, deprecated_register_bytes ()); |
| |
| buf[0] = 18; |
| buf[1] = 1; |
| buf[2] = 0; |
| retlen = sds_send (buf, 3); |
| |
| for (i = 0; i < 4 * 6; ++i) |
| regs[i + 4 * 32 + 8 * 32] = buf[i]; |
| for (i = 0; i < 4 * 4; ++i) |
| sprs[i] = buf[i + 4 * 7]; |
| |
| buf[0] = 18; |
| buf[1] = 2; |
| buf[2] = 0; |
| retlen = sds_send (buf, 3); |
| |
| for (i = 0; i < retlen; i++) |
| regs[i] = buf[i]; |
| |
| /* (should warn about reply too short) */ |
| |
| for (i = 0; i < NUM_REGS; i++) |
| regcache_raw_supply (current_regcache, i, |
| ®s[DEPRECATED_REGISTER_BYTE (i)]); |
| } |
| |
| /* Prepare to store registers. Since we may send them all, we have to |
| read out the ones we don't want to change first. */ |
| |
| static void |
| sds_prepare_to_store (void) |
| { |
| /* Make sure the entire registers array is valid. */ |
| deprecated_read_register_bytes (0, (char *) NULL, deprecated_register_bytes ()); |
| } |
| |
| /* Store register REGNO, or all registers if REGNO == -1, from the contents |
| of REGISTERS. FIXME: ignores errors. */ |
| |
| static void |
| sds_store_registers (int regno) |
| { |
| unsigned char *p, buf[PBUFSIZ]; |
| int i; |
| |
| /* Store all the special-purpose registers. */ |
| p = buf; |
| *p++ = 19; |
| *p++ = 1; |
| *p++ = 0; |
| *p++ = 0; |
| for (i = 0; i < 4 * 6; i++) |
| *p++ = deprecated_registers[i + 4 * 32 + 8 * 32]; |
| for (i = 0; i < 4 * 1; i++) |
| *p++ = 0; |
| for (i = 0; i < 4 * 4; i++) |
| *p++ = sprs[i]; |
| |
| sds_send (buf, p - buf); |
| |
| /* Store all the general-purpose registers. */ |
| p = buf; |
| *p++ = 19; |
| *p++ = 2; |
| *p++ = 0; |
| *p++ = 0; |
| for (i = 0; i < 4 * 32; i++) |
| *p++ = deprecated_registers[i]; |
| |
| sds_send (buf, p - buf); |
| |
| } |
| |
| /* Write memory data directly to the remote machine. This does not |
| inform the data cache; the data cache uses this. MEMADDR is the |
| address in the remote memory space. MYADDR is the address of the |
| buffer in our space. LEN is the number of bytes. |
| |
| Returns number of bytes transferred, or 0 for error. */ |
| |
| static int |
| sds_write_bytes (CORE_ADDR memaddr, char *myaddr, int len) |
| { |
| int max_buf_size; /* Max size of packet output buffer */ |
| int origlen; |
| unsigned char buf[PBUFSIZ]; |
| int todo; |
| int i; |
| |
| /* Chop the transfer down if necessary */ |
| |
| max_buf_size = 150; |
| |
| origlen = len; |
| while (len > 0) |
| { |
| todo = min (len, max_buf_size); |
| |
| buf[0] = 13; |
| buf[1] = 0; |
| buf[2] = (int) (memaddr >> 24) & 0xff; |
| buf[3] = (int) (memaddr >> 16) & 0xff; |
| buf[4] = (int) (memaddr >> 8) & 0xff; |
| buf[5] = (int) (memaddr) & 0xff; |
| buf[6] = 1; |
| buf[7] = 0; |
| |
| for (i = 0; i < todo; i++) |
| buf[i + 8] = myaddr[i]; |
| |
| sds_send (buf, 8 + todo); |
| |
| /* (should look at result) */ |
| |
| myaddr += todo; |
| memaddr += todo; |
| len -= todo; |
| } |
| return origlen; |
| } |
| |
| /* Read memory data directly from the remote machine. This does not |
| use the data cache; the data cache uses this. MEMADDR is the |
| address in the remote memory space. MYADDR is the address of the |
| buffer in our space. LEN is the number of bytes. |
| |
| Returns number of bytes transferred, or 0 for error. */ |
| |
| static int |
| sds_read_bytes (CORE_ADDR memaddr, char *myaddr, int len) |
| { |
| int max_buf_size; /* Max size of packet output buffer */ |
| int origlen, retlen; |
| unsigned char buf[PBUFSIZ]; |
| int todo; |
| int i; |
| |
| /* Chop the transfer down if necessary */ |
| |
| max_buf_size = 150; |
| |
| origlen = len; |
| while (len > 0) |
| { |
| todo = min (len, max_buf_size); |
| |
| buf[0] = 12; |
| buf[1] = 0; |
| buf[2] = (int) (memaddr >> 24) & 0xff; |
| buf[3] = (int) (memaddr >> 16) & 0xff; |
| buf[4] = (int) (memaddr >> 8) & 0xff; |
| buf[5] = (int) (memaddr) & 0xff; |
| buf[6] = (int) (todo >> 8) & 0xff; |
| buf[7] = (int) (todo) & 0xff; |
| buf[8] = 1; |
| |
| retlen = sds_send (buf, 9); |
| |
| if (retlen - 2 != todo) |
| { |
| return 0; |
| } |
| |
| /* Reply describes memory byte by byte. */ |
| |
| for (i = 0; i < todo; i++) |
| myaddr[i] = buf[i + 2]; |
| |
| myaddr += todo; |
| memaddr += todo; |
| len -= todo; |
| } |
| |
| return origlen; |
| } |
| |
| /* Read or write LEN bytes from inferior memory at MEMADDR, |
| transferring to or from debugger address MYADDR. Write to inferior |
| if SHOULD_WRITE is nonzero. Returns length of data written or |
| read; 0 for error. TARGET is unused. */ |
| |
| static int |
| sds_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int should_write, |
| struct mem_attrib *attrib, struct target_ops *target) |
| { |
| int res; |
| |
| if (should_write) |
| res = sds_write_bytes (memaddr, myaddr, len); |
| else |
| res = sds_read_bytes (memaddr, myaddr, len); |
| |
| return res; |
| } |
| |
| |
| static void |
| sds_files_info (struct target_ops *ignore) |
| { |
| puts_filtered ("Debugging over a serial connection, using SDS protocol.\n"); |
| } |
| |
| /* Stuff for dealing with the packets which are part of this protocol. |
| See comment at top of file for details. */ |
| |
| /* Read a single character from the remote end, masking it down to 7 bits. */ |
| |
| static int |
| readchar (int timeout) |
| { |
| int ch; |
| |
| ch = serial_readchar (sds_desc, timeout); |
| |
| if (remote_debug > 1 && ch >= 0) |
| fprintf_unfiltered (gdb_stdlog, "%c(%x)", ch, ch); |
| |
| switch (ch) |
| { |
| case SERIAL_EOF: |
| error ("Remote connection closed"); |
| case SERIAL_ERROR: |
| perror_with_name ("Remote communication error"); |
| case SERIAL_TIMEOUT: |
| return ch; |
| default: |
| return ch & 0x7f; |
| } |
| } |
| |
| /* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably |
| because 253, 254, and 255 are special flags in the protocol.) */ |
| |
| static int |
| compute_checksum (int csum, char *buf, int len) |
| { |
| int i; |
| |
| for (i = 0; i < len; ++i) |
| csum += (unsigned char) buf[i]; |
| |
| csum %= 253; |
| return csum; |
| } |
| |
| /* Send the command in BUF to the remote machine, and read the reply |
| into BUF also. */ |
| |
| static int |
| sds_send (unsigned char *buf, int len) |
| { |
| putmessage (buf, len); |
| |
| return getmessage (buf, 0); |
| } |
| |
| /* Send a message to the remote machine. */ |
| |
| static int |
| putmessage (unsigned char *buf, int len) |
| { |
| int i, enclen; |
| unsigned char csum = 0; |
| char buf2[PBUFSIZ], buf3[PBUFSIZ]; |
| unsigned char header[3]; |
| char *p; |
| |
| /* Copy the packet into buffer BUF2, encapsulating it |
| and giving it a checksum. */ |
| |
| if (len > 170) /* Prosanity check */ |
| internal_error (__FILE__, __LINE__, _("failed internal consistency check")); |
| |
| if (remote_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Message to send: \""); |
| for (i = 0; i < len; ++i) |
| fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); |
| fprintf_unfiltered (gdb_stdlog, "\"\n"); |
| } |
| |
| p = buf2; |
| *p++ = '$'; |
| |
| if (len % 3 != 0) |
| { |
| buf[len] = '\0'; |
| buf[len + 1] = '\0'; |
| } |
| |
| header[1] = next_msg_id; |
| |
| header[2] = len; |
| |
| csum = compute_checksum (csum, buf, len); |
| csum = compute_checksum (csum, header + 1, 2); |
| |
| header[0] = csum; |
| |
| tob64 (header, p, 3); |
| p += 4; |
| enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3); |
| |
| for (i = 0; i < enclen; ++i) |
| *p++ = buf3[i]; |
| *p++ = '\r'; |
| *p++ = '\n'; |
| |
| next_msg_id = (next_msg_id + 3) % 245; |
| |
| /* Send it over and over until we get a positive ack. */ |
| |
| while (1) |
| { |
| if (remote_debug) |
| { |
| *p = '\0'; |
| fprintf_unfiltered (gdb_stdlog, "Sending encoded: \"%s\"", buf2); |
| fprintf_unfiltered (gdb_stdlog, |
| " (Checksum %d, id %d, length %d)\n", |
| header[0], header[1], header[2]); |
| gdb_flush (gdb_stdlog); |
| } |
| if (serial_write (sds_desc, buf2, p - buf2)) |
| perror_with_name ("putmessage: write failed"); |
| |
| return 1; |
| } |
| } |
| |
| /* Come here after finding the start of the frame. Collect the rest |
| into BUF. Returns 0 on any error, 1 on success. */ |
| |
| static int |
| read_frame (char *buf) |
| { |
| char *bp; |
| int c; |
| |
| bp = buf; |
| |
| while (1) |
| { |
| c = readchar (sds_timeout); |
| |
| switch (c) |
| { |
| case SERIAL_TIMEOUT: |
| if (remote_debug) |
| fputs_filtered ("Timeout in mid-message, retrying\n", gdb_stdlog); |
| return 0; |
| case '$': |
| if (remote_debug) |
| fputs_filtered ("Saw new packet start in middle of old one\n", |
| gdb_stdlog); |
| return 0; /* Start a new packet, count retries */ |
| case '\r': |
| break; |
| |
| case '\n': |
| { |
| *bp = '\000'; |
| if (remote_debug) |
| fprintf_unfiltered (gdb_stdlog, "Received encoded: \"%s\"\n", |
| buf); |
| return 1; |
| } |
| |
| default: |
| if (bp < buf + PBUFSIZ - 1) |
| { |
| *bp++ = c; |
| continue; |
| } |
| |
| *bp = '\0'; |
| puts_filtered ("Message too long: "); |
| puts_filtered (buf); |
| puts_filtered ("\n"); |
| |
| return 0; |
| } |
| } |
| } |
| |
| /* Read a packet from the remote machine, with error checking, |
| and store it in BUF. BUF is expected to be of size PBUFSIZ. |
| If FOREVER, wait forever rather than timing out; this is used |
| while the target is executing user code. */ |
| |
| static int |
| getmessage (unsigned char *buf, int forever) |
| { |
| int c, c2, c3; |
| int tries; |
| int timeout; |
| int val, i, len, csum; |
| unsigned char header[3]; |
| unsigned char inbuf[500]; |
| |
| strcpy (buf, "timeout"); |
| |
| if (forever) |
| { |
| timeout = watchdog > 0 ? watchdog : -1; |
| } |
| |
| else |
| timeout = sds_timeout; |
| |
| #define MAX_TRIES 3 |
| |
| for (tries = 1; tries <= MAX_TRIES; tries++) |
| { |
| /* This can loop forever if the remote side sends us characters |
| continuously, but if it pauses, we'll get a zero from readchar |
| because of timeout. Then we'll count that as a retry. */ |
| |
| /* Note that we will only wait forever prior to the start of a packet. |
| After that, we expect characters to arrive at a brisk pace. They |
| should show up within sds_timeout intervals. */ |
| |
| do |
| { |
| c = readchar (timeout); |
| |
| if (c == SERIAL_TIMEOUT) |
| { |
| if (forever) /* Watchdog went off. Kill the target. */ |
| { |
| target_mourn_inferior (); |
| error ("Watchdog has expired. Target detached.\n"); |
| } |
| if (remote_debug) |
| fputs_filtered ("Timed out.\n", gdb_stdlog); |
| goto retry; |
| } |
| } |
| while (c != '$' && c != '{'); |
| |
| /* We might have seen a "trigraph", a sequence of three characters |
| that indicate various sorts of communication state. */ |
| |
| if (c == '{') |
| { |
| /* Read the other two chars of the trigraph. */ |
| c2 = readchar (timeout); |
| c3 = readchar (timeout); |
| if (remote_debug) |
| fprintf_unfiltered (gdb_stdlog, "Trigraph %c%c%c received\n", |
| c, c2, c3); |
| if (c3 == '+') |
| { |
| message_pending = 1; |
| return 0; /*???? */ |
| } |
| continue; |
| } |
| |
| val = read_frame (inbuf); |
| |
| if (val == 1) |
| { |
| fromb64 (inbuf, header, 4); |
| /* (should check out other bits) */ |
| fromb64 (inbuf + 4, buf, strlen (inbuf) - 4); |
| |
| len = header[2]; |
| |
| csum = 0; |
| csum = compute_checksum (csum, buf, len); |
| csum = compute_checksum (csum, header + 1, 2); |
| |
| if (csum != header[0]) |
| fprintf_unfiltered (gdb_stderr, |
| "Checksum mismatch: computed %d, received %d\n", |
| csum, header[0]); |
| |
| if (header[2] == 0xff) |
| fprintf_unfiltered (gdb_stderr, "Requesting resend...\n"); |
| |
| if (remote_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "... (Got checksum %d, id %d, length %d)\n", |
| header[0], header[1], header[2]); |
| fprintf_unfiltered (gdb_stdlog, "Message received: \""); |
| for (i = 0; i < len; ++i) |
| { |
| fprintf_unfiltered (gdb_stdlog, "%02x", (unsigned char) buf[i]); |
| } |
| fprintf_unfiltered (gdb_stdlog, "\"\n"); |
| } |
| |
| /* no ack required? */ |
| return len; |
| } |
| |
| /* Try the whole thing again. */ |
| retry: |
| /* need to do something here */ |
| ; |
| } |
| |
| /* We have tried hard enough, and just can't receive the packet. Give up. */ |
| |
| printf_unfiltered ("Ignoring packet error, continuing...\n"); |
| return 0; |
| } |
| |
| static void |
| sds_kill (void) |
| { |
| /* Don't try to do anything to the target. */ |
| } |
| |
| static void |
| sds_mourn (void) |
| { |
| unpush_target (&sds_ops); |
| generic_mourn_inferior (); |
| } |
| |
| static void |
| sds_create_inferior (char *exec_file, char *args, char **env, int from_tty) |
| { |
| inferior_ptid = pid_to_ptid (42000); |
| |
| /* Clean up from the last time we were running. */ |
| clear_proceed_status (); |
| |
| /* Let the remote process run. */ |
| proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0); |
| } |
| |
| static void |
| sds_load (char *filename, int from_tty) |
| { |
| generic_load (filename, from_tty); |
| |
| inferior_ptid = null_ptid; |
| } |
| |
| /* The SDS monitor has commands for breakpoint insertion, although it |
| it doesn't actually manage the breakpoints, it just returns the |
| replaced instruction back to the debugger. */ |
| |
| static int |
| sds_insert_breakpoint (CORE_ADDR addr, char *contents_cache) |
| { |
| int i, retlen; |
| unsigned char *p, buf[PBUFSIZ]; |
| |
| p = buf; |
| *p++ = 16; |
| *p++ = 0; |
| *p++ = (int) (addr >> 24) & 0xff; |
| *p++ = (int) (addr >> 16) & 0xff; |
| *p++ = (int) (addr >> 8) & 0xff; |
| *p++ = (int) (addr) & 0xff; |
| |
| retlen = sds_send (buf, p - buf); |
| |
| for (i = 0; i < 4; ++i) |
| contents_cache[i] = buf[i + 2]; |
| |
| return 0; |
| } |
| |
| static int |
| sds_remove_breakpoint (CORE_ADDR addr, char *contents_cache) |
| { |
| int i, retlen; |
| unsigned char *p, buf[PBUFSIZ]; |
| |
| p = buf; |
| *p++ = 17; |
| *p++ = 0; |
| *p++ = (int) (addr >> 24) & 0xff; |
| *p++ = (int) (addr >> 16) & 0xff; |
| *p++ = (int) (addr >> 8) & 0xff; |
| *p++ = (int) (addr) & 0xff; |
| for (i = 0; i < 4; ++i) |
| *p++ = contents_cache[i]; |
| |
| retlen = sds_send (buf, p - buf); |
| |
| return 0; |
| } |
| |
| static void |
| init_sds_ops (void) |
| { |
| sds_ops.to_shortname = "sds"; |
| sds_ops.to_longname = "Remote serial target with SDS protocol"; |
| sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\ |
| Specify the serial device it is connected to (e.g. /dev/ttya)."; |
| sds_ops.to_open = sds_open; |
| sds_ops.to_close = sds_close; |
| sds_ops.to_detach = sds_detach; |
| sds_ops.to_resume = sds_resume; |
| sds_ops.to_wait = sds_wait; |
| sds_ops.to_fetch_registers = sds_fetch_registers; |
| sds_ops.to_store_registers = sds_store_registers; |
| sds_ops.to_prepare_to_store = sds_prepare_to_store; |
| sds_ops.deprecated_xfer_memory = sds_xfer_memory; |
| sds_ops.to_files_info = sds_files_info; |
| sds_ops.to_insert_breakpoint = sds_insert_breakpoint; |
| sds_ops.to_remove_breakpoint = sds_remove_breakpoint; |
| sds_ops.to_kill = sds_kill; |
| sds_ops.to_load = sds_load; |
| sds_ops.to_create_inferior = sds_create_inferior; |
| sds_ops.to_mourn_inferior = sds_mourn; |
| sds_ops.to_stratum = process_stratum; |
| sds_ops.to_has_all_memory = 1; |
| sds_ops.to_has_memory = 1; |
| sds_ops.to_has_stack = 1; |
| sds_ops.to_has_registers = 1; |
| sds_ops.to_has_execution = 1; |
| sds_ops.to_magic = OPS_MAGIC; |
| } |
| |
| /* Put a command string, in args, out to the monitor and display the |
| reply message. */ |
| |
| static void |
| sds_command (char *args, int from_tty) |
| { |
| char *p; |
| int i, len, retlen; |
| unsigned char buf[1000]; |
| |
| /* Convert hexadecimal chars into a byte buffer. */ |
| p = args; |
| len = 0; |
| while (*p != '\0') |
| { |
| buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]); |
| if (p[1] == '\0') |
| break; |
| p += 2; |
| } |
| |
| retlen = sds_send (buf, len); |
| |
| printf_filtered ("Reply is "); |
| for (i = 0; i < retlen; ++i) |
| { |
| printf_filtered ("%02x", buf[i]); |
| } |
| printf_filtered ("\n"); |
| } |
| |
| void |
| _initialize_remote_sds (void) |
| { |
| init_sds_ops (); |
| add_target (&sds_ops); |
| |
| add_setshow_integer_cmd ("sdstimeout", no_class, &sds_timeout, _("\ |
| Set timeout value for sds read."), _("\ |
| Show timeout value for sds read."), NULL, |
| NULL, |
| NULL, /* FIXME: i18n: */ |
| &setlist, &showlist); |
| |
| add_com ("sds", class_obscure, sds_command, |
| _("Send a command to the SDS monitor.")); |
| } |