From: Michael Snyder Date: Thu, 4 Jun 1998 17:55:57 +0000 (+0000) Subject: Fix my previous screwed-up checkin. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0005424512c023401553fefbead175775534af54;p=binutils-gdb.git Fix my previous screwed-up checkin. --- diff --git a/gdb/remote.c b/gdb/remote.c index 00f7dbcd678..9c7ef948b83 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -2022,4169 +2022,6 @@ open_remote_target (name, from_tty, target, extended_p) remote_open_1 (name, from_tty, target, extended_p); } -/* Remote target communications for serial-line targets in custom GDB protocol - Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. - -This file is part of GDB. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -/* Remote communication protocol. - - A debug packet whose contents are - is encapsulated for transmission in the form: - - $ # CSUM1 CSUM2 - - must be ASCII alphanumeric and cannot include characters - '$' or '#'. If starts with two characters followed by - ':', then the existing stubs interpret this as a sequence number. - - CSUM1 and CSUM2 are ascii hex representation of an 8-bit - checksum of , the most significant nibble is sent first. - the hex digits 0-9,a-f are used. - - Receiver responds with: - - + - if CSUM is correct and ready for next packet - - - if CSUM is incorrect - - is as follows: - Most values are encoded in ascii hex digits. Signal numbers are according - to the numbering in target.h. - - Request Packet - - set thread Hct... Set thread for subsequent operations. - c = 'c' for thread used in step and - continue; t... can be -1 for all - threads. - c = 'g' for thread used in other - operations. If zero, pick a thread, - any thread. - reply OK for success - ENN for an error. - - read registers g - reply XX....X Each byte of register data - is described by two hex digits. - Registers are in the internal order - for GDB, and the bytes in a register - are in the same order the machine uses. - or ENN for an error. - - write regs GXX..XX Each byte of register data - is described by two hex digits. - reply OK for success - ENN for an error - - write reg Pn...=r... Write register n... with value r..., - which contains two hex digits for each - byte in the register (target byte - order). - reply OK for success - ENN for an error - (not supported by all stubs). - - read mem mAA..AA,LLLL AA..AA is address, LLLL is length. - reply XX..XX XX..XX is mem contents - Can be fewer bytes than requested - if able to read only part of the data. - or ENN NN is errno - - write mem MAA..AA,LLLL:XX..XX - AA..AA is address, - LLLL is number of bytes, - XX..XX is data - reply OK for success - ENN for an error (this includes the case - where only part of the data was - written). - - continue cAA..AA AA..AA is address to resume - If AA..AA is omitted, - resume at same address. - - step sAA..AA AA..AA is address to resume - If AA..AA is omitted, - resume at same address. - - continue with Csig;AA..AA Continue with signal sig (hex signal - signal number). If ;AA..AA is omitted, resume - at same address. - - step with Ssig;AA..AA Like 'C' but step not continue. - signal - - last signal ? Reply the current reason for stopping. - This is the same reply as is generated - for step or cont : SAA where AA is the - signal number. - - detach D Reply OK. - - There is no immediate reply to step or cont. - The reply comes when the machine stops. - It is SAA AA is the signal number. - - or... TAAn...:r...;n...:r...;n...:r...; - AA = signal number - n... = register number (hex) - r... = register contents - n... = `thread' - r... = thread process ID. This is - a hex integer. - n... = other string not starting - with valid hex digit. - gdb should ignore this n,r pair - and go on to the next. This way - we can extend the protocol. - or... WAA The process exited, and AA is - the exit status. This is only - applicable for certains sorts of - targets. - or... XAA The process terminated with signal - AA. - or... OXX..XX XX..XX is hex encoding of ASCII data. This - can happen at any time while the program is - running and the debugger should - continue to wait for 'W', 'T', etc. - - thread alive TXX Find out if the thread XX is alive. - reply OK thread is still alive - ENN thread is dead - - remote restart RXX Restart the remote server - - extended ops ! Use the extended remote protocol. - Sticky -- only needs to be set once. - - kill request k - - toggle debug d toggle debug flag (see 386 & 68k stubs) - reset r reset -- see sparc stub. - reserved On other requests, the stub should - ignore the request and send an empty - response ($#). This way - we can extend the protocol and GDB - can tell whether the stub it is - talking to uses the old or the new. - search tAA:PP,MM Search backwards starting at address - AA for a match with pattern PP and - mask MM. PP and MM are 4 bytes. - Not supported by all stubs. - - general query qXXXX Request info about XXXX. - general set QXXXX=yyyy Set value of XXXX to yyyy. - query sect offs qOffsets Get section offsets. Reply is - Text=xxx;Data=yyy;Bss=zzz - - Responses can be run-length encoded to save space. A '*' means that - the next character is an ASCII encoding giving a repeat count which - stands for that many repititions of the character preceding the '*'. - The encoding is n+29, yielding a printable character where n >=3 - (which is where rle starts to win). Don't use an n > 126. - - So - "0* " means the same as "0000". */ - -#include "defs.h" -#include "gdb_string.h" -#include -#include "frame.h" -#include "inferior.h" -#include "bfd.h" -#include "symfile.h" -#include "target.h" -#include "wait.h" -/*#include "terminal.h"*/ -#include "gdbcmd.h" -#include "objfiles.h" -#include "gdb-stabs.h" -#include "gdbthread.h" - -#include "dcache.h" - -#ifdef USG -#include -#endif - -#include -#include "serial.h" - -/* Prototypes for local functions */ - -static int remote_write_bytes PARAMS ((CORE_ADDR memaddr, - char *myaddr, int len)); - -static int remote_read_bytes PARAMS ((CORE_ADDR memaddr, - char *myaddr, int len)); - -static void remote_files_info PARAMS ((struct target_ops *ignore)); - -static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, - int len, int should_write, - struct target_ops *target)); - -static void remote_prepare_to_store PARAMS ((void)); - -static void remote_fetch_registers PARAMS ((int regno)); - -static void remote_resume PARAMS ((int pid, int step, - enum target_signal siggnal)); - -static int remote_start_remote PARAMS ((char *dummy)); - -static void remote_open PARAMS ((char *name, int from_tty)); - -static void extended_remote_open PARAMS ((char *name, int from_tty)); - -static void remote_open_1 PARAMS ((char *, int, struct target_ops *, int extended_p)); - -static void remote_close PARAMS ((int quitting)); - -static void remote_store_registers PARAMS ((int regno)); - -static void remote_mourn PARAMS ((void)); - -static void extended_remote_restart PARAMS ((void)); - -static void extended_remote_mourn PARAMS ((void)); - -static void extended_remote_create_inferior PARAMS ((char *, char *, char **)); - -static void remote_mourn_1 PARAMS ((struct target_ops *)); - -static void remote_send PARAMS ((char *buf)); - -static int readchar PARAMS ((int timeout)); - -static int remote_wait PARAMS ((int pid, struct target_waitstatus *status)); - -static void remote_kill PARAMS ((void)); - -static int tohex PARAMS ((int nib)); - -static void remote_detach PARAMS ((char *args, int from_tty)); - -static void remote_interrupt PARAMS ((int signo)); - -static void remote_interrupt_twice PARAMS ((int signo)); - -static void interrupt_query PARAMS ((void)); - -static void set_thread PARAMS ((int, int)); - -static int remote_thread_alive PARAMS ((int)); - -static void get_offsets PARAMS ((void)); - -static int read_frame PARAMS ((char *)); - -static int remote_insert_breakpoint PARAMS ((CORE_ADDR, char *)); - -static int remote_remove_breakpoint PARAMS ((CORE_ADDR, char *)); - -static int hexnumlen PARAMS ((ULONGEST num)); - -/* exported functions */ - -extern int fromhex PARAMS ((int a)); -extern void getpkt PARAMS ((char *buf, int forever)); -extern int putpkt PARAMS ((char *buf)); - -/* Define the target subroutine names */ - -static struct target_ops remote_ops ; - -static void init_remote_ops(void) -{ - remote_ops.to_shortname = "remote"; - remote_ops.to_longname = "Remote serial target in gdb-specific protocol"; - remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\ -Specify the serial device it is connected to (e.g. /dev/ttya)." ; - remote_ops.to_open = remote_open; - remote_ops.to_close = remote_close; - remote_ops.to_attach = NULL; - remote_ops.to_detach = remote_detach; - remote_ops.to_resume = remote_resume; - remote_ops.to_wait = remote_wait; - remote_ops.to_fetch_registers = remote_fetch_registers; - remote_ops.to_store_registers = remote_store_registers; - remote_ops.to_prepare_to_store = remote_prepare_to_store; - remote_ops.to_xfer_memory = remote_xfer_memory; - remote_ops.to_files_info = remote_files_info; - remote_ops.to_insert_breakpoint = remote_insert_breakpoint; - remote_ops.to_remove_breakpoint = remote_remove_breakpoint; - remote_ops.to_terminal_init = NULL; - remote_ops.to_terminal_inferior = NULL; - remote_ops.to_terminal_ours_for_output = NULL; - remote_ops.to_terminal_ours = NULL; - remote_ops.to_terminal_info = NULL; - remote_ops.to_kill = remote_kill; - remote_ops.to_load = generic_load; - remote_ops.to_lookup_symbol = NULL; - remote_ops.to_create_inferior = NULL; - remote_ops.to_mourn_inferior = remote_mourn; - remote_ops.to_can_run = 0; - remote_ops.to_notice_signals = 0; - remote_ops.to_thread_alive = remote_thread_alive; - remote_ops.to_stop = 0; - remote_ops.to_stratum = process_stratum; - remote_ops.DONT_USE = NULL; - remote_ops.to_has_all_memory = 1; - remote_ops.to_has_memory = 1; - remote_ops.to_has_stack = 1; - remote_ops.to_has_registers = 1; - remote_ops.to_has_execution = 1; - remote_ops.to_sections = NULL; - remote_ops.to_sections_end = NULL; - remote_ops.to_magic = OPS_MAGIC ; -} /* init_remote_ops */ - -static struct target_ops extended_remote_ops ; - -static void init_extended_remote_ops(void) -{ - extended_remote_ops.to_shortname = "extended-remote"; - extended_remote_ops.to_longname = "Extended remote serial target in gdb-specific protocol"; - extended_remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\ -Specify the serial device it is connected to (e.g. /dev/ttya).", - extended_remote_ops.to_open = extended_remote_open; - extended_remote_ops.to_close = remote_close; - extended_remote_ops.to_attach = NULL; - extended_remote_ops.to_detach = remote_detach; - extended_remote_ops.to_resume = remote_resume; - extended_remote_ops.to_wait = remote_wait; - extended_remote_ops.to_fetch_registers = remote_fetch_registers; - extended_remote_ops.to_store_registers = remote_store_registers; - extended_remote_ops.to_prepare_to_store = remote_prepare_to_store; - extended_remote_ops.to_xfer_memory = remote_xfer_memory; - extended_remote_ops.to_files_info = remote_files_info; - extended_remote_ops.to_insert_breakpoint = remote_insert_breakpoint; - extended_remote_ops.to_remove_breakpoint = remote_remove_breakpoint; - extended_remote_ops.to_terminal_init = NULL; - extended_remote_ops.to_terminal_inferior = NULL; - extended_remote_ops.to_terminal_ours_for_output = NULL; - extended_remote_ops.to_terminal_ours = NULL; - extended_remote_ops.to_terminal_info = NULL; - extended_remote_ops.to_kill = remote_kill; - extended_remote_ops.to_load = generic_load; - extended_remote_ops.to_lookup_symbol = NULL; - extended_remote_ops.to_create_inferior = extended_remote_create_inferior; - extended_remote_ops.to_mourn_inferior = extended_remote_mourn; - extended_remote_ops.to_can_run = 0; - extended_remote_ops.to_notice_signals = 0; - extended_remote_ops.to_thread_alive = remote_thread_alive; - extended_remote_ops.to_stop = 0; - extended_remote_ops.to_stratum = process_stratum; - extended_remote_ops.DONT_USE = NULL; - extended_remote_ops.to_has_all_memory = 1; - extended_remote_ops.to_has_memory = 1; - extended_remote_ops.to_has_stack = 1; - extended_remote_ops.to_has_registers = 1; - extended_remote_ops.to_has_execution = 1; - extended_remote_ops.to_sections = NULL; - extended_remote_ops.to_sections_end = NULL; - extended_remote_ops.to_magic = OPS_MAGIC ; -} - - -/* 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. */ - -/* Changed to allow option to set timeout value. - was static int remote_timeout = 2; */ -extern int remote_timeout; - -/* This variable chooses whether to send a ^C or a break when the user - requests program interruption. Although ^C is usually what remote - systems expect, and that is the default here, sometimes a break is - preferable instead. */ - -static int remote_break; - -/* Descriptor for I/O to remote machine. Initialize it to NULL so that - remote_open knows that we don't have a file open when the program - starts. */ -static serial_t remote_desc = NULL; - -/* 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 - -/* 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) - -/* Round up PBUFSIZ to hold all the registers, at least. */ -/* The blank line after the #if seems to be required to work around a - bug in HP's PA compiler. */ -#if REGISTER_BYTES > MAXBUFBYTES - -#undef PBUFSIZ -#define PBUFSIZ (REGISTER_BYTES * 2 + 32) -#endif - -/* This variable sets the number of bytes to be written to the target - in a single packet. Normally PBUFSIZ is satisfactory, but some - targets need smaller values (perhaps because the receiving end - is slow). */ - -static int remote_write_size = PBUFSIZ; - -/* This is the size (in chars) of the first response to the `g' command. This - is used to limit the size of the memory read and write commands to prevent - stub buffers from overflowing. The size does not include headers and - trailers, it is only the payload size. */ - -static int remote_register_buf_size = 0; - -/* Should we try the 'P' request? If this is set to one when the stub - doesn't support 'P', the only consequence is some unnecessary traffic. */ -static int stub_supports_P = 1; - -/* These are pointers to hook functions that may be set in order to - modify resume/wait behavior for a particular architecture. */ - -void (*target_resume_hook) PARAMS ((void)); -void (*target_wait_loop_hook) PARAMS ((void)); - - -/* These are the threads which we last sent to the remote system. -1 for all - or -2 for not sent yet. */ -int general_thread; -int cont_thread; - -static void -set_thread (th, gen) - int th; - int gen; -{ - char buf[PBUFSIZ]; - int state = gen ? general_thread : cont_thread; - if (state == th) - return; - buf[0] = 'H'; - buf[1] = gen ? 'g' : 'c'; - if (th == 42000) - { - buf[2] = '0'; - buf[3] = '\0'; - } - else if (th < 0) - sprintf (&buf[2], "-%x", -th); - else - sprintf (&buf[2], "%x", th); - putpkt (buf); - getpkt (buf, 0); - if (gen) - general_thread = th; - else - cont_thread = th; -} - -/* Return nonzero if the thread TH is still alive on the remote system. */ - -static int -remote_thread_alive (th) - int th; -{ - char buf[PBUFSIZ]; - - buf[0] = 'T'; - if (th < 0) - sprintf (&buf[1], "-%x", -th); - else - sprintf (&buf[1], "%x", th); - putpkt (buf); - getpkt (buf, 0); - return (buf[0] == 'O' && buf[1] == 'K'); -} - -/* Restart the remote side; this is an extended protocol operation. */ - -static void -extended_remote_restart () -{ - char buf[PBUFSIZ]; - - /* Send the restart command; for reasons I don't understand the - remote side really expects a number after the "R". */ - buf[0] = 'R'; - sprintf (&buf[1], "%x", 0); - putpkt (buf); - - /* Now query for status so this looks just like we restarted - gdbserver from scratch. */ - putpkt ("?"); - getpkt (buf, 0); -} - -/* Clean up connection to a remote debugger. */ - -/* ARGSUSED */ -static void -remote_close (quitting) - int quitting; -{ - if (remote_desc) - SERIAL_CLOSE (remote_desc); - remote_desc = NULL; -} - -/* Query the remote side for the text, data and bss offsets. */ - -static void -get_offsets () -{ - char buf[PBUFSIZ], *ptr; - int lose; - CORE_ADDR text_addr, data_addr, bss_addr; - struct section_offsets *offs; - - putpkt ("qOffsets"); - - getpkt (buf, 0); - - if (buf[0] == '\000') - return; /* Return silently. Stub doesn't support this - command. */ - if (buf[0] == 'E') - { - warning ("Remote failure reply: %s", buf); - return; - } - - /* Pick up each field in turn. This used to be done with scanf, but - scanf will make trouble if CORE_ADDR size doesn't match - conversion directives correctly. The following code will work - with any size of CORE_ADDR. */ - text_addr = data_addr = bss_addr = 0; - ptr = buf; - lose = 0; - - if (strncmp (ptr, "Text=", 5) == 0) - { - ptr += 5; - /* Don't use strtol, could lose on big values. */ - while (*ptr && *ptr != ';') - text_addr = (text_addr << 4) + fromhex (*ptr++); - } - else - lose = 1; - - if (!lose && strncmp (ptr, ";Data=", 6) == 0) - { - ptr += 6; - while (*ptr && *ptr != ';') - data_addr = (data_addr << 4) + fromhex (*ptr++); - } - else - lose = 1; - - if (!lose && strncmp (ptr, ";Bss=", 5) == 0) - { - ptr += 5; - while (*ptr && *ptr != ';') - bss_addr = (bss_addr << 4) + fromhex (*ptr++); - } - else - lose = 1; - - if (lose) - error ("Malformed response to offset query, %s", buf); - - if (symfile_objfile == NULL) - return; - - offs = (struct section_offsets *) alloca (sizeof (struct section_offsets) - + symfile_objfile->num_sections - * sizeof (offs->offsets)); - memcpy (offs, symfile_objfile->section_offsets, - sizeof (struct section_offsets) - + symfile_objfile->num_sections - * sizeof (offs->offsets)); - - ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; - - /* This is a temporary kludge to force data and bss to use the same offsets - because that's what nlmconv does now. The real solution requires changes - to the stub and remote.c that I don't have time to do right now. */ - - ANOFFSET (offs, SECT_OFF_DATA) = data_addr; - ANOFFSET (offs, SECT_OFF_BSS) = data_addr; - - objfile_relocate (symfile_objfile, offs); -} - -/* Stub for catch_errors. */ - -static int -remote_start_remote (dummy) - char *dummy; -{ - immediate_quit = 1; /* Allow user to interrupt it */ - - /* Ack any packet which the remote side has already sent. */ - SERIAL_WRITE (remote_desc, "+", 1); - - /* Let the stub know that we want it to return the thread. */ - set_thread (-1, 0); - - get_offsets (); /* Get text, data & bss offsets */ - - putpkt ("?"); /* initiate a query from remote machine */ - immediate_quit = 0; - - start_remote (); /* Initialize gdb process mechanisms */ - return 1; -} - -/* Open a connection to a remote debugger. - NAME is the filename used for communication. */ - -static void -remote_open (name, from_tty) - char *name; - int from_tty; -{ - remote_open_1 (name, from_tty, &remote_ops, 0); -} - -/* Open a connection to a remote debugger using the extended - remote gdb protocol. NAME is the filename used for communication. */ - -static void -extended_remote_open (name, from_tty) - char *name; - int from_tty; -{ - remote_open_1 (name, from_tty, &extended_remote_ops, 1/*extended_p*/); -} - -/* Generic code for opening a connection to a remote target. */ -static DCACHE *remote_dcache; - -static void -remote_open_1 (name, from_tty, target, extended_p) - char *name; - int from_tty; - struct target_ops *target; - int extended_p; -{ - 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 (target); - - remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); - - remote_desc = SERIAL_OPEN (name); - if (!remote_desc) - perror_with_name (name); - - if (baud_rate != -1) - { - if (SERIAL_SETBAUDRATE (remote_desc, baud_rate)) - { - SERIAL_CLOSE (remote_desc); - perror_with_name (name); - } - } - - - SERIAL_RAW (remote_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 (remote_desc); - - if (from_tty) - { - puts_filtered ("Remote debugging using "); - puts_filtered (name); - puts_filtered ("\n"); - } - push_target (target); /* Switch to using remote target now */ - - /* Start out by trying the 'P' request to set registers. We set this each - time that we open a new target so that if the user switches from one - stub to another, we can (if the target is closed and reopened) cope. */ - stub_supports_P = 1; - - general_thread = -2; - cont_thread = -2; - - /* Without this, some commands which require an active target (such as kill) - won't work. This variable serves (at least) double duty as both the pid - of the target process (if it has such), and as a flag indicating that a - target is active. These functions should be split out into seperate - variables, especially since GDB will someday have a notion of debugging - several processes. */ - - inferior_pid = 42000; - /* 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 (remote_start_remote, (char *)0, - "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) - { - pop_target(); - return; - } - - if (extended_p) - { - /* tell the remote that we're using the extended protocol. */ - char buf[PBUFSIZ]; - putpkt ("!"); - getpkt (buf, 0); - } -} - -/* 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 -remote_detach (args, from_tty) - char *args; - int from_tty; -{ - char buf[PBUFSIZ]; - - if (args) - error ("Argument given to \"detach\" when remotely debugging."); - - /* Tell the remote target to detach. */ - strcpy (buf, "D"); - remote_send (buf); - - pop_target (); - if (from_tty) - puts_filtered ("Ending remote debugging.\n"); -} - -/* Convert hex digit A to a number. */ - -int -fromhex (a) - int a; -{ - if (a >= '0' && a <= '9') - return a - '0'; - else if (a >= 'a' && a <= 'f') - return a - 'a' + 10; - else if (a >= 'A' && a <= 'F') - return a - 'A' + 10; - else - error ("Reply contains invalid hex digit %d", a); -} - -/* Convert number NIB to a hex digit. */ - -static int -tohex (nib) - int nib; -{ - if (nib < 10) - return '0'+nib; - else - return 'a'+nib-10; -} - -/* Tell the remote machine to resume. */ - -static enum target_signal last_sent_signal = TARGET_SIGNAL_0; -int last_sent_step; - -static void -remote_resume (pid, step, siggnal) - int pid, step; - enum target_signal siggnal; -{ - char buf[PBUFSIZ]; - - if (pid == -1) - set_thread (inferior_pid, 0); - else - set_thread (pid, 0); - - dcache_flush (remote_dcache); - - last_sent_signal = siggnal; - last_sent_step = step; - - /* A hook for when we need to do something at the last moment before - resumption. */ - if (target_resume_hook) - (*target_resume_hook) (); - - if (siggnal != TARGET_SIGNAL_0) - { - buf[0] = step ? 'S' : 'C'; - buf[1] = tohex (((int)siggnal >> 4) & 0xf); - buf[2] = tohex ((int)siggnal & 0xf); - buf[3] = '\0'; - } - else - strcpy (buf, step ? "s": "c"); - - putpkt (buf); -} - -/* Send ^C to target to halt it. Target will respond, and send us a - packet. */ - -static void -remote_interrupt (signo) - int signo; -{ - /* If this doesn't work, try more severe steps. */ - signal (signo, remote_interrupt_twice); - - if (remote_debug) - printf_unfiltered ("remote_interrupt called\n"); - - /* Send a break or a ^C, depending on user preference. */ - if (remote_break) - SERIAL_SEND_BREAK (remote_desc); - else - SERIAL_WRITE (remote_desc, "\003", 1); -} - -static void (*ofunc)(); - -/* The user typed ^C twice. */ -static void -remote_interrupt_twice (signo) - int signo; -{ - signal (signo, ofunc); - - interrupt_query (); - - signal (signo, remote_interrupt); -} - -/* Ask the user what to do when an interrupt is received. */ - -static void -interrupt_query () -{ - target_terminal_ours (); - - if (query ("Interrupted while waiting for the program.\n\ -Give up (and stop debugging it)? ")) - { - target_mourn_inferior (); - return_to_top_level (RETURN_QUIT); - } - - target_terminal_inferior (); -} - -/* If nonzero, ignore the next kill. */ -int kill_kludge; - -void -remote_console_output (msg) - char *msg; -{ - char *p; - - for (p = msg; *p; p +=2) - { - char tb[2]; - char c = fromhex (p[0]) * 16 + fromhex (p[1]); - tb[0] = c; - tb[1] = 0; - if (target_output_hook) - target_output_hook (tb); - else - fputs_filtered (tb, gdb_stdout); - } -} - -/* 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 int -remote_wait (pid, status) - int pid; - struct target_waitstatus *status; -{ - unsigned char buf[PBUFSIZ]; - int thread_num = -1; - - status->kind = TARGET_WAITKIND_EXITED; - status->value.integer = 0; - - while (1) - { - unsigned char *p; - - ofunc = (void (*)()) signal (SIGINT, remote_interrupt); - getpkt ((char *) buf, 1); - signal (SIGINT, ofunc); - - /* This is a hook for when we need to do something (perhaps the - collection of trace data) every time the target stops. */ - if (target_wait_loop_hook) - (*target_wait_loop_hook) (); - - switch (buf[0]) - { - case 'E': /* Error of some sort */ - warning ("Remote failure reply: %s", buf); - continue; - case 'T': /* Status with PC, SP, FP, ... */ - { - int i; - long regno; - char regs[MAX_REGISTER_RAW_SIZE]; - - /* Expedited reply, containing Signal, {regno, reg} repeat */ - /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where - ss = signal number - n... = register number - r... = register contents - */ - p = &buf[3]; /* after Txx */ - - while (*p) - { - unsigned char *p1; - char *p_temp; - - regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */ - p1 = (unsigned char *)p_temp; - - if (p1 == p) - { - p1 = (unsigned char *) strchr ((const char *) p, ':'); - if (p1 == NULL) - warning ("Malformed packet (missing colon): %s\n\ -Packet: '%s'\n", - p, buf); - if (strncmp ((const char *) p, "thread", p1 - p) == 0) - { - thread_num = strtol ((const char *) ++p1, &p_temp, 16); - p = (unsigned char *)p_temp; - } - } - else - { - p = p1; - - if (*p++ != ':') - warning ("Malformed packet (missing colon): %s\n\ -Packet: '%s'\n", - p, buf); - - if (regno >= NUM_REGS) - warning ("Remote sent bad register number %ld: %s\n\ -Packet: '%s'\n", - regno, p, buf); - - for (i = 0; i < REGISTER_RAW_SIZE (regno); i++) - { - if (p[0] == 0 || p[1] == 0) - warning ("Remote reply is too short: %s", buf); - regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); - p += 2; - } - supply_register (regno, regs); - } - - if (*p++ != ';') - warning ("Remote register badly formatted: %s", buf); - } - } - /* fall through */ - case 'S': /* Old style status, just signal only */ - status->kind = TARGET_WAITKIND_STOPPED; - status->value.sig = (enum target_signal) - (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); - - goto got_status; - case 'W': /* Target exited */ - { - /* The remote process exited. */ - status->kind = TARGET_WAITKIND_EXITED; - status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]); - goto got_status; - } - case 'X': - status->kind = TARGET_WAITKIND_SIGNALLED; - status->value.sig = (enum target_signal) - (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); - kill_kludge = 1; - - goto got_status; - case 'O': /* Console output */ - remote_console_output (buf + 1); - continue; - case '\0': - if (last_sent_signal != TARGET_SIGNAL_0) - { - /* Zero length reply means that we tried 'S' or 'C' and - the remote system doesn't support it. */ - target_terminal_ours_for_output (); - printf_filtered - ("Can't send signals to this remote system. %s not sent.\n", - target_signal_to_name (last_sent_signal)); - last_sent_signal = TARGET_SIGNAL_0; - target_terminal_inferior (); - - strcpy ((char *) buf, last_sent_step ? "s" : "c"); - putpkt ((char *) buf); - continue; - } - /* else fallthrough */ - default: - warning ("Invalid remote reply: %s", buf); - continue; - } - } - got_status: - if (thread_num != -1) - { - /* Initial thread value can only be acquired via wait, so deal with - this marker which is used before the first thread value is - acquired. */ - if (inferior_pid == 42000) - { - inferior_pid = thread_num; - add_thread (inferior_pid); - } - return thread_num; - } - return inferior_pid; -} - -/* Number of bytes of registers this stub implements. */ -static int register_bytes_found; - -/* Read the remote registers into the block REGS. */ -/* Currently we just read all the registers, so we don't use regno. */ -/* ARGSUSED */ -static void -remote_fetch_registers (regno) - int regno; -{ - char buf[PBUFSIZ]; - int i; - char *p; - char regs[REGISTER_BYTES]; - - set_thread (inferior_pid, 1); - - sprintf (buf, "g"); - remote_send (buf); - - if (remote_register_buf_size == 0) - remote_register_buf_size = strlen (buf); - - /* Unimplemented registers read as all bits zero. */ - memset (regs, 0, REGISTER_BYTES); - - /* We can get out of synch in various cases. If the first character - in the buffer is not a hex character, assume that has happened - and try to fetch another packet to read. */ - while ((buf[0] < '0' || buf[0] > '9') - && (buf[0] < 'a' || buf[0] > 'f')) - { - if (remote_debug) - printf_unfiltered ("Bad register packet; fetching a new packet\n"); - getpkt (buf, 0); - } - - /* Reply describes registers byte by byte, each byte encoded as two - hex characters. Suck them all up, then supply them to the - register cacheing/storage mechanism. */ - - p = buf; - for (i = 0; i < REGISTER_BYTES; i++) - { - if (p[0] == 0) - break; - if (p[1] == 0) - { - warning ("Remote reply is of odd length: %s", buf); - /* Don't change register_bytes_found in this case, and don't - print a second warning. */ - goto supply_them; - } - regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); - p += 2; - } - - if (i != register_bytes_found) - { - register_bytes_found = i; -#ifdef REGISTER_BYTES_OK - if (!REGISTER_BYTES_OK (i)) - warning ("Remote reply is too short: %s", buf); -#endif - } - - supply_them: - for (i = 0; i < NUM_REGS; i++) - supply_register (i, ®s[REGISTER_BYTE(i)]); -} - -/* Prepare to store registers. Since we may send them all (using a - 'G' request), we have to read out the ones we don't want to change - first. */ - -static void -remote_prepare_to_store () -{ - /* Make sure the entire registers array is valid. */ - read_register_bytes (0, (char *)NULL, REGISTER_BYTES); -} - -/* Store register REGNO, or all registers if REGNO == -1, from the contents - of REGISTERS. FIXME: ignores errors. */ - -static void -remote_store_registers (regno) - int regno; -{ - char buf[PBUFSIZ]; - int i; - char *p; - - set_thread (inferior_pid, 1); - - if (regno >= 0 && stub_supports_P) - { - /* Try storing a single register. */ - char *regp; - - sprintf (buf, "P%x=", regno); - p = buf + strlen (buf); - regp = ®isters[REGISTER_BYTE (regno)]; - for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i) - { - *p++ = tohex ((regp[i] >> 4) & 0xf); - *p++ = tohex (regp[i] & 0xf); - } - *p = '\0'; - remote_send (buf); - if (buf[0] != '\0') - { - /* The stub understands the 'P' request. We are done. */ - return; - } - - /* The stub does not support the 'P' request. Use 'G' instead, - and don't try using 'P' in the future (it will just waste our - time). */ - stub_supports_P = 0; - } - - buf[0] = 'G'; - - /* Command describes registers byte by byte, - each byte encoded as two hex characters. */ - - p = buf + 1; - /* remote_prepare_to_store insures that register_bytes_found gets set. */ - for (i = 0; i < register_bytes_found; i++) - { - *p++ = tohex ((registers[i] >> 4) & 0xf); - *p++ = tohex (registers[i] & 0xf); - } - *p = '\0'; - - remote_send (buf); -} - -/* - Use of the data cache *used* to be disabled because it loses for looking at - and changing hardware I/O ports and the like. Accepting `volatile' - would perhaps be one way to fix it. Another idea would be to use the - executable file for the text segment (for all SEC_CODE sections? - For all SEC_READONLY sections?). This has problems if you want to - actually see what the memory contains (e.g. self-modifying code, - clobbered memory, user downloaded the wrong thing). - - Because it speeds so much up, it's now enabled, if you're playing - with registers you turn it of (set remotecache 0) -*/ - -/* Read a word from remote address ADDR and return it. - This goes through the data cache. */ - -#if 0 /* unused? */ -static int -remote_fetch_word (addr) - CORE_ADDR addr; -{ - return dcache_fetch (remote_dcache, addr); -} - -/* Write a word WORD into remote address ADDR. - This goes through the data cache. */ - -static void -remote_store_word (addr, word) - CORE_ADDR addr; - int word; -{ - dcache_poke (remote_dcache, addr, word); -} -#endif /* 0 (unused?) */ - - - -/* Return the number of hex digits in num. */ - -static int -hexnumlen (num) - ULONGEST num; -{ - int i; - - for (i = 0; num != 0; i++) - num >>= 4; - - return max (i, 1); -} - -/* 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 -remote_write_bytes (memaddr, myaddr, len) - CORE_ADDR memaddr; - char *myaddr; - int len; -{ - int max_buf_size; /* Max size of packet output buffer */ - int origlen; - - /* Chop the transfer down if necessary */ - - max_buf_size = min (remote_write_size, PBUFSIZ); - if (remote_register_buf_size != 0) - max_buf_size = min (max_buf_size, remote_register_buf_size); - - /* Subtract header overhead from max payload size - $M,:#nn */ - max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4; - - origlen = len; - while (len > 0) - { - char buf[PBUFSIZ]; - char *p; - int todo; - int i; - - todo = min (len, max_buf_size / 2); /* num bytes that will fit */ - - /* FIXME-32x64: Need a version of print_address_numeric which puts the - result in a buffer like sprintf. */ - sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo); - - /* We send target system values byte by byte, in increasing byte addresses, - each byte encoded as two hex characters. */ - - p = buf + strlen (buf); - for (i = 0; i < todo; i++) - { - *p++ = tohex ((myaddr[i] >> 4) & 0xf); - *p++ = tohex (myaddr[i] & 0xf); - } - *p = '\0'; - - putpkt (buf); - getpkt (buf, 0); - - if (buf[0] == 'E') - { - /* There is no correspondance between what the remote protocol uses - for errors and errno codes. We would like a cleaner way of - representing errors (big enough to include errno codes, bfd_error - codes, and others). But for now just return EIO. */ - errno = EIO; - return 0; - } - 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 -remote_read_bytes (memaddr, myaddr, len) - CORE_ADDR memaddr; - char *myaddr; - int len; -{ - int max_buf_size; /* Max size of packet output buffer */ - int origlen; - - /* Chop the transfer down if necessary */ - - max_buf_size = min (remote_write_size, PBUFSIZ); - if (remote_register_buf_size != 0) - max_buf_size = min (max_buf_size, remote_register_buf_size); - - origlen = len; - while (len > 0) - { - char buf[PBUFSIZ]; - char *p; - int todo; - int i; - - todo = min (len, max_buf_size / 2); /* num bytes that will fit */ - - /* FIXME-32x64: Need a version of print_address_numeric which puts the - result in a buffer like sprintf. */ - sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo); - putpkt (buf); - getpkt (buf, 0); - - if (buf[0] == 'E') - { - /* There is no correspondance between what the remote protocol uses - for errors and errno codes. We would like a cleaner way of - representing errors (big enough to include errno codes, bfd_error - codes, and others). But for now just return EIO. */ - errno = EIO; - return 0; - } - - /* Reply describes memory byte by byte, - each byte encoded as two hex characters. */ - - p = buf; - for (i = 0; i < todo; i++) - { - if (p[0] == 0 || p[1] == 0) - /* Reply is short. This means that we were able to read only part - of what we wanted to. */ - return i + (origlen - len); - myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); - p += 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. */ - -/* ARGSUSED */ -static int -remote_xfer_memory(memaddr, myaddr, len, should_write, target) - CORE_ADDR memaddr; - char *myaddr; - int len; - int should_write; - struct target_ops *target; /* ignored */ -{ -#ifdef REMOTE_TRANSLATE_XFER_ADDRESS - CORE_ADDR targaddr; - int targlen; - REMOTE_TRANSLATE_XFER_ADDRESS (memaddr, len, targaddr, targlen); - if (targlen == 0) - return 0; - memaddr = targaddr; - len = targlen; -#endif - - return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write); -} - - -#if 0 -/* Enable after 4.12. */ - -void -remote_search (len, data, mask, startaddr, increment, lorange, hirange - addr_found, data_found) - int len; - char *data; - char *mask; - CORE_ADDR startaddr; - int increment; - CORE_ADDR lorange; - CORE_ADDR hirange; - CORE_ADDR *addr_found; - char *data_found; -{ - if (increment == -4 && len == 4) - { - long mask_long, data_long; - long data_found_long; - CORE_ADDR addr_we_found; - char buf[PBUFSIZ]; - long returned_long[2]; - char *p; - - mask_long = extract_unsigned_integer (mask, len); - data_long = extract_unsigned_integer (data, len); - sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long); - putpkt (buf); - getpkt (buf, 0); - if (buf[0] == '\0') - { - /* The stub doesn't support the 't' request. We might want to - remember this fact, but on the other hand the stub could be - switched on us. Maybe we should remember it only until - the next "target remote". */ - generic_search (len, data, mask, startaddr, increment, lorange, - hirange, addr_found, data_found); - return; - } - - if (buf[0] == 'E') - /* There is no correspondance between what the remote protocol uses - for errors and errno codes. We would like a cleaner way of - representing errors (big enough to include errno codes, bfd_error - codes, and others). But for now just use EIO. */ - memory_error (EIO, startaddr); - p = buf; - addr_we_found = 0; - while (*p != '\0' && *p != ',') - addr_we_found = (addr_we_found << 4) + fromhex (*p++); - if (*p == '\0') - error ("Protocol error: short return for search"); - - data_found_long = 0; - while (*p != '\0' && *p != ',') - data_found_long = (data_found_long << 4) + fromhex (*p++); - /* Ignore anything after this comma, for future extensions. */ - - if (addr_we_found < lorange || addr_we_found >= hirange) - { - *addr_found = 0; - return; - } - - *addr_found = addr_we_found; - *data_found = store_unsigned_integer (data_we_found, len); - return; - } - generic_search (len, data, mask, startaddr, increment, lorange, - hirange, addr_found, data_found); -} -#endif /* 0 */ - -static void -remote_files_info (ignore) - struct target_ops *ignore; -{ - puts_filtered ("Debugging a target over a serial line.\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 (timeout) - int timeout; -{ - int ch; - - ch = SERIAL_READCHAR (remote_desc, timeout); - - 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; - } -} - -/* Send the command in BUF to the remote machine, - and read the reply into BUF. - Report an error if we get an error reply. */ - -static void -remote_send (buf) - char *buf; -{ - putpkt (buf); - getpkt (buf, 0); - - if (buf[0] == 'E') - error ("Remote failure reply: %s", buf); -} - -/* Send a packet to the remote machine, with error checking. - The data of the packet is in BUF. */ - -int -putpkt (buf) - char *buf; -{ - int i; - unsigned char csum = 0; - char buf2[PBUFSIZ]; - int cnt = strlen (buf); - int ch; - int tcount = 0; - char *p; - - /* Copy the packet into buffer BUF2, encapsulating it - and giving it a checksum. */ - - if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */ - abort(); - - p = buf2; - *p++ = '$'; - - for (i = 0; i < cnt; i++) - { - csum += buf[i]; - *p++ = buf[i]; - } - *p++ = '#'; - *p++ = tohex ((csum >> 4) & 0xf); - *p++ = tohex (csum & 0xf); - - /* Send it over and over until we get a positive ack. */ - - while (1) - { - int started_error_output = 0; - - if (remote_debug) - { - *p = '\0'; - printf_unfiltered ("Sending packet: %s...", buf2); - gdb_flush(gdb_stdout); - } - if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) - perror_with_name ("putpkt: write failed"); - - /* read until either a timeout occurs (-2) or '+' is read */ - while (1) - { - ch = readchar (remote_timeout); - - if (remote_debug) - { - switch (ch) - { - case '+': - case SERIAL_TIMEOUT: - case '$': - if (started_error_output) - { - putchar_unfiltered ('\n'); - started_error_output = 0; - } - } - } - - switch (ch) - { - case '+': - if (remote_debug) - printf_unfiltered("Ack\n"); - return 1; - case SERIAL_TIMEOUT: - tcount ++; - if (tcount > 3) - return 0; - break; /* Retransmit buffer */ - case '$': - { - char junkbuf[PBUFSIZ]; - - /* It's probably an old response, and we're out of sync. Just - gobble up the packet and ignore it. */ - getpkt (junkbuf, 0); - continue; /* Now, go look for + */ - } - default: - if (remote_debug) - { - if (!started_error_output) - { - started_error_output = 1; - printf_unfiltered ("putpkt: Junk: "); - } - putchar_unfiltered (ch & 0177); - } - continue; - } - break; /* Here to retransmit */ - } - -#if 0 - /* This is wrong. If doing a long backtrace, the user should be - able to get out next time we call QUIT, without anything as violent - as interrupt_query. If we want to provide a way out of here - without getting to the next QUIT, it should be based on hitting - ^C twice as in remote_wait. */ - if (quit_flag) - { - quit_flag = 0; - interrupt_query (); - } -#endif - } -} - -/* Come here after finding the start of the frame. Collect the rest into BUF, - verifying the checksum, length, and handling run-length compression. - Returns 0 on any error, 1 on success. */ - -static int -read_frame (buf) - char *buf; -{ - unsigned char csum; - char *bp; - int c; - - csum = 0; - bp = buf; - - while (1) - { - c = readchar (remote_timeout); - - switch (c) - { - case SERIAL_TIMEOUT: - if (remote_debug) - puts_filtered ("Timeout in mid-packet, retrying\n"); - return 0; - case '$': - if (remote_debug) - puts_filtered ("Saw new packet start in middle of old one\n"); - return 0; /* Start a new packet, count retries */ - case '#': - { - unsigned char pktcsum; - - *bp = '\000'; - - pktcsum = fromhex (readchar (remote_timeout)) << 4; - pktcsum |= fromhex (readchar (remote_timeout)); - - if (csum == pktcsum) - return 1; - - if (remote_debug) - { - printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", - pktcsum, csum); - puts_filtered (buf); - puts_filtered ("\n"); - } - return 0; - } - case '*': /* Run length encoding */ - csum += c; - c = readchar (remote_timeout); - csum += c; - c = c - ' ' + 3; /* Compute repeat count */ - - - if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1) - { - memset (bp, *(bp - 1), c); - bp += c; - continue; - } - - *bp = '\0'; - printf_filtered ("Repeat count %d too large for buffer: ", c); - puts_filtered (buf); - puts_filtered ("\n"); - return 0; - - default: - if (bp < buf + PBUFSIZ - 1) - { - *bp++ = c; - csum += c; - continue; - } - - *bp = '\0'; - puts_filtered ("Remote packet 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. */ - -void -getpkt (buf, forever) - char *buf; - int forever; -{ - int c; - int tries; - int timeout; - int val; - - strcpy (buf,"timeout"); - - if (forever) - { -#ifdef MAINTENANCE_CMDS - timeout = watchdog > 0 ? watchdog : -1; -#else - timeout = -1; -#endif - } - - else - timeout = remote_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 remote_timeout intervals. */ - - do - { - c = readchar (timeout); - - if (c == SERIAL_TIMEOUT) - { -#ifdef MAINTENANCE_CMDS - if (forever) /* Watchdog went off. Kill the target. */ - { - target_mourn_inferior (); - error ("Watchdog has expired. Target detached.\n"); - } -#endif - if (remote_debug) - puts_filtered ("Timed out.\n"); - goto retry; - } - } - while (c != '$'); - - /* We've found the start of a packet, now collect the data. */ - - val = read_frame (buf); - - if (val == 1) - { - if (remote_debug) - fprintf_unfiltered (gdb_stdout, "Packet received: %s\n", buf); - SERIAL_WRITE (remote_desc, "+", 1); - return; - } - - /* Try the whole thing again. */ - retry: - SERIAL_WRITE (remote_desc, "-", 1); - } - - /* We have tried hard enough, and just can't receive the packet. Give up. */ - - printf_unfiltered ("Ignoring packet error, continuing...\n"); - SERIAL_WRITE (remote_desc, "+", 1); -} - -static void -remote_kill () -{ - /* For some mysterious reason, wait_for_inferior calls kill instead of - mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ - if (kill_kludge) - { - kill_kludge = 0; - target_mourn_inferior (); - return; - } - - /* Use catch_errors so the user can quit from gdb even when we aren't on - speaking terms with the remote system. */ - catch_errors (putpkt, "k", "", RETURN_MASK_ERROR); - - /* Don't wait for it to die. I'm not really sure it matters whether - we do or not. For the existing stubs, kill is a noop. */ - target_mourn_inferior (); -} - -static void -remote_mourn () -{ - remote_mourn_1 (&remote_ops); -} - -static void -extended_remote_mourn () -{ - /* We do _not_ want to mourn the target like this; this will - remove the extended remote target from the target stack, - and the next time the user says "run" it'll fail. - - FIXME: What is the right thing to do here? */ -#if 0 - remote_mourn_1 (&extended_remote_ops); -#endif -} - -/* Worker function for remote_mourn. */ -static void -remote_mourn_1 (target) - struct target_ops *target; -{ - unpush_target (target); - generic_mourn_inferior (); -} - -/* In the extended protocol we want to be able to do things like - "run" and have them basically work as expected. So we need - a special create_inferior function. - - FIXME: One day add support for changing the exec file - we're debugging, arguments and an environment. */ - -static void -extended_remote_create_inferior (exec_file, args, env) - char *exec_file; - char *args; - char **env; -{ - /* Rip out the breakpoints; we'll reinsert them after restarting - the remote server. */ - remove_breakpoints (); - - /* Now restart the remote server. */ - extended_remote_restart (); - - /* Now put the breakpoints back in. This way we're safe if the - restart function works via a unix fork on the remote side. */ - insert_breakpoints (); - - /* Clean up from the last time we were running. */ - clear_proceed_status (); - - /* Let the remote process run. */ - proceed (-1, TARGET_SIGNAL_0, 0); -} - - -/* On some machines, e.g. 68k, we may use a different breakpoint instruction - than other targets; in those use REMOTE_BREAKPOINT instead of just - BREAKPOINT. Also, bi-endian targets may define LITTLE_REMOTE_BREAKPOINT - and BIG_REMOTE_BREAKPOINT. If none of these are defined, we just call - the standard routines that are in mem-break.c. */ - -/* FIXME, these ought to be done in a more dynamic fashion. For instance, - the choice of breakpoint instruction affects target program design and - vice versa, and by making it user-tweakable, the special code here - goes away and we need fewer special GDB configurations. */ - -#if defined (LITTLE_REMOTE_BREAKPOINT) && defined (BIG_REMOTE_BREAKPOINT) && !defined(REMOTE_BREAKPOINT) -#define REMOTE_BREAKPOINT -#endif - -#ifdef REMOTE_BREAKPOINT - -/* If the target isn't bi-endian, just pretend it is. */ -#if !defined (LITTLE_REMOTE_BREAKPOINT) && !defined (BIG_REMOTE_BREAKPOINT) -#define LITTLE_REMOTE_BREAKPOINT REMOTE_BREAKPOINT -#define BIG_REMOTE_BREAKPOINT REMOTE_BREAKPOINT -#endif - -static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT; -static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT; - -#endif /* REMOTE_BREAKPOINT */ - -/* Insert a breakpoint on targets that don't have any better breakpoint - support. We read the contents of the target location and stash it, - then overwrite it with a breakpoint instruction. ADDR is the target - location in the target machine. CONTENTS_CACHE is a pointer to - memory allocated for saving the target contents. It is guaranteed - by the caller to be long enough to save sizeof BREAKPOINT bytes (this - is accomplished via BREAKPOINT_MAX). */ - -static int -remote_insert_breakpoint (addr, contents_cache) - CORE_ADDR addr; - char *contents_cache; -{ -#ifdef REMOTE_BREAKPOINT - int val; - - val = target_read_memory (addr, contents_cache, sizeof big_break_insn); - - if (val == 0) - { - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - val = target_write_memory (addr, (char *) big_break_insn, - sizeof big_break_insn); - else - val = target_write_memory (addr, (char *) little_break_insn, - sizeof little_break_insn); - } - - return val; -#else - return memory_insert_breakpoint (addr, contents_cache); -#endif /* REMOTE_BREAKPOINT */ -} - -static int -remote_remove_breakpoint (addr, contents_cache) - CORE_ADDR addr; - char *contents_cache; -{ -#ifdef REMOTE_BREAKPOINT - return target_write_memory (addr, contents_cache, sizeof big_break_insn); -#else - return memory_remove_breakpoint (addr, contents_cache); -#endif /* REMOTE_BREAKPOINT */ -} - -/* Some targets are only capable of doing downloads, and afterwards they switch - to the remote serial protocol. This function provides a clean way to get - from the download target to the remote target. It's basically just a - wrapper so that we don't have to expose any of the internal workings of - remote.c. - - Prior to calling this routine, you should shutdown the current target code, - else you will get the "A program is being debugged already..." message. - Usually a call to pop_target() suffices. -*/ - -void -push_remote_target (name, from_tty) - char *name; - int from_tty; -{ - printf_filtered ("Switching to remote protocol\n"); - remote_open (name, from_tty); -} - -/* Other targets want to use the entire remote serial module but with - certain remote_ops overridden. */ - -void -open_remote_target (name, from_tty, target, extended_p) - char *name; - int from_tty; - struct target_ops *target; - int extended_p; -{ - printf_filtered ("Selecting the %sremote protocol\n", - (extended_p ? "extended-" : "")); - remote_open_1 (name, from_tty, target, extended_p); -} - -/* Table used by the crc32 function to calcuate the checksum. */ -static unsigned long crc32_table[256] = {0, 0}; - -static unsigned long -crc32 (buf, len, crc) - unsigned char *buf; - int len; - unsigned int crc; -{ - if (! crc32_table[1]) - { - /* Initialize the CRC table and the decoding table. */ - int i, j; - unsigned int c; - - for (i = 0; i < 256; i++) - { - for (c = i << 24, j = 8; j > 0; --j) - c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1); - crc32_table[i] = c; - } - } - - while (len--) - { - crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255]; - buf++; - } - return crc; -} - -/* compare-sections command - - With no arguments, compares each loadable section in the exec bfd - with the same memory range on the target, and reports mismatches. - Useful for verifying the image on the target against the exec file. - Depends on the target understanding the new "qCRC:" request. */ - -static void -remote_compare_command (args, from_tty) - char *args; - int from_tty; -{ - asection *s; - unsigned long host_crc, target_crc; - extern bfd *exec_bfd; - struct cleanup *old_chain; - char *tmp, *sectdata, *sectname, buf[PBUFSIZ]; - bfd_size_type size; - bfd_vma lma; - int matched = 0; - - if (!exec_bfd) - error ("command cannot be used without an exec file"); - if (!current_target.to_shortname || - strcmp (current_target.to_shortname, "remote") != 0) - error ("command can only be used with remote target"); - - for (s = exec_bfd->sections; s; s = s->next) - { - if (!(s->flags & SEC_LOAD)) - continue; /* skip non-loadable section */ - - size = bfd_get_section_size_before_reloc (s); - if (size == 0) - continue; /* skip zero-length section */ - - sectname = (char *) bfd_get_section_name (exec_bfd, s); - if (args && strcmp (args, sectname) != 0) - continue; /* not the section selected by user */ - - matched = 1; /* do this section */ - lma = s->lma; - /* FIXME: assumes lma can fit into long */ - sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size); - putpkt (buf); - - /* be clever; compute the host_crc before waiting for target reply */ - sectdata = xmalloc (size); - old_chain = make_cleanup (free, sectdata); - bfd_get_section_contents (exec_bfd, s, sectdata, 0, size); - host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff); - - getpkt (buf, 0); - if (buf[0] == 'E') - error ("target memory fault, section %s, range 0x%08x -- 0x%08x", - sectname, lma, lma + size); - if (buf[0] != 'C') - error ("remote target does not support this operation"); - - for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++) - target_crc = target_crc * 16 + fromhex (*tmp); - - printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ", - sectname, lma, lma + size); - if (host_crc == target_crc) - printf_filtered ("matched.\n"); - else - printf_filtered ("MIS-MATCHED!\n"); - - do_cleanups (old_chain); - } - if (args && !matched) - printf_filtered ("No loaded section named '%s'.\n", args); -} - - -void -_initialize_remote () -{ - init_remote_ops() ; - init_extended_remote_ops() ; - add_target (&remote_ops); - add_target (&extended_remote_ops); - -/* Remote target communications for serial-line targets in custom GDB protocol - Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. - -This file is part of GDB. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -/* Remote communication protocol. - - A debug packet whose contents are - is encapsulated for transmission in the form: - - $ # CSUM1 CSUM2 - - must be ASCII alphanumeric and cannot include characters - '$' or '#'. If starts with two characters followed by - ':', then the existing stubs interpret this as a sequence number. - - CSUM1 and CSUM2 are ascii hex representation of an 8-bit - checksum of , the most significant nibble is sent first. - the hex digits 0-9,a-f are used. - - Receiver responds with: - - + - if CSUM is correct and ready for next packet - - - if CSUM is incorrect - - is as follows: - Most values are encoded in ascii hex digits. Signal numbers are according - to the numbering in target.h. - - Request Packet - - set thread Hct... Set thread for subsequent operations. - c = 'c' for thread used in step and - continue; t... can be -1 for all - threads. - c = 'g' for thread used in other - operations. If zero, pick a thread, - any thread. - reply OK for success - ENN for an error. - - read registers g - reply XX....X Each byte of register data - is described by two hex digits. - Registers are in the internal order - for GDB, and the bytes in a register - are in the same order the machine uses. - or ENN for an error. - - write regs GXX..XX Each byte of register data - is described by two hex digits. - reply OK for success - ENN for an error - - write reg Pn...=r... Write register n... with value r..., - which contains two hex digits for each - byte in the register (target byte - order). - reply OK for success - ENN for an error - (not supported by all stubs). - - read mem mAA..AA,LLLL AA..AA is address, LLLL is length. - reply XX..XX XX..XX is mem contents - Can be fewer bytes than requested - if able to read only part of the data. - or ENN NN is errno - - write mem MAA..AA,LLLL:XX..XX - AA..AA is address, - LLLL is number of bytes, - XX..XX is data - reply OK for success - ENN for an error (this includes the case - where only part of the data was - written). - - continue cAA..AA AA..AA is address to resume - If AA..AA is omitted, - resume at same address. - - step sAA..AA AA..AA is address to resume - If AA..AA is omitted, - resume at same address. - - continue with Csig;AA..AA Continue with signal sig (hex signal - signal number). If ;AA..AA is omitted, resume - at same address. - - step with Ssig;AA..AA Like 'C' but step not continue. - signal - - last signal ? Reply the current reason for stopping. - This is the same reply as is generated - for step or cont : SAA where AA is the - signal number. - - detach D Reply OK. - - There is no immediate reply to step or cont. - The reply comes when the machine stops. - It is SAA AA is the signal number. - - or... TAAn...:r...;n...:r...;n...:r...; - AA = signal number - n... = register number (hex) - r... = register contents - n... = `thread' - r... = thread process ID. This is - a hex integer. - n... = other string not starting - with valid hex digit. - gdb should ignore this n,r pair - and go on to the next. This way - we can extend the protocol. - or... WAA The process exited, and AA is - the exit status. This is only - applicable for certains sorts of - targets. - or... XAA The process terminated with signal - AA. - or... OXX..XX XX..XX is hex encoding of ASCII data. This - can happen at any time while the program is - running and the debugger should - continue to wait for 'W', 'T', etc. - - thread alive TXX Find out if the thread XX is alive. - reply OK thread is still alive - ENN thread is dead - - remote restart RXX Restart the remote server - - extended ops ! Use the extended remote protocol. - Sticky -- only needs to be set once. - - kill request k - - toggle debug d toggle debug flag (see 386 & 68k stubs) - reset r reset -- see sparc stub. - reserved On other requests, the stub should - ignore the request and send an empty - response ($#). This way - we can extend the protocol and GDB - can tell whether the stub it is - talking to uses the old or the new. - search tAA:PP,MM Search backwards starting at address - AA for a match with pattern PP and - mask MM. PP and MM are 4 bytes. - Not supported by all stubs. - - general query qXXXX Request info about XXXX. - general set QXXXX=yyyy Set value of XXXX to yyyy. - query sect offs qOffsets Get section offsets. Reply is - Text=xxx;Data=yyy;Bss=zzz - - Responses can be run-length encoded to save space. A '*' means that - the next character is an ASCII encoding giving a repeat count which - stands for that many repititions of the character preceding the '*'. - The encoding is n+29, yielding a printable character where n >=3 - (which is where rle starts to win). Don't use an n > 126. - - So - "0* " means the same as "0000". */ - -#include "defs.h" -#include "gdb_string.h" -#include -#include "frame.h" -#include "inferior.h" -#include "bfd.h" -#include "symfile.h" -#include "target.h" -#include "wait.h" -/*#include "terminal.h"*/ -#include "gdbcmd.h" -#include "objfiles.h" -#include "gdb-stabs.h" -#include "gdbthread.h" - -#include "dcache.h" - -#ifdef USG -#include -#endif - -#include -#include "serial.h" - -/* Prototypes for local functions */ - -static int remote_write_bytes PARAMS ((CORE_ADDR memaddr, - char *myaddr, int len)); - -static int remote_read_bytes PARAMS ((CORE_ADDR memaddr, - char *myaddr, int len)); - -static void remote_files_info PARAMS ((struct target_ops *ignore)); - -static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, - int len, int should_write, - struct target_ops *target)); - -static void remote_prepare_to_store PARAMS ((void)); - -static void remote_fetch_registers PARAMS ((int regno)); - -static void remote_resume PARAMS ((int pid, int step, - enum target_signal siggnal)); - -static int remote_start_remote PARAMS ((char *dummy)); - -static void remote_open PARAMS ((char *name, int from_tty)); - -static void extended_remote_open PARAMS ((char *name, int from_tty)); - -static void remote_open_1 PARAMS ((char *, int, struct target_ops *, int extended_p)); - -static void remote_close PARAMS ((int quitting)); - -static void remote_store_registers PARAMS ((int regno)); - -static void remote_mourn PARAMS ((void)); - -static void extended_remote_restart PARAMS ((void)); - -static void extended_remote_mourn PARAMS ((void)); - -static void extended_remote_create_inferior PARAMS ((char *, char *, char **)); - -static void remote_mourn_1 PARAMS ((struct target_ops *)); - -static void remote_send PARAMS ((char *buf)); - -static int readchar PARAMS ((int timeout)); - -static int remote_wait PARAMS ((int pid, struct target_waitstatus *status)); - -static void remote_kill PARAMS ((void)); - -static int tohex PARAMS ((int nib)); - -static void remote_detach PARAMS ((char *args, int from_tty)); - -static void remote_interrupt PARAMS ((int signo)); - -static void remote_interrupt_twice PARAMS ((int signo)); - -static void interrupt_query PARAMS ((void)); - -static void set_thread PARAMS ((int, int)); - -static int remote_thread_alive PARAMS ((int)); - -static void get_offsets PARAMS ((void)); - -static int read_frame PARAMS ((char *)); - -static int remote_insert_breakpoint PARAMS ((CORE_ADDR, char *)); - -static int remote_remove_breakpoint PARAMS ((CORE_ADDR, char *)); - -static int hexnumlen PARAMS ((ULONGEST num)); - -/* exported functions */ - -extern int fromhex PARAMS ((int a)); -extern void getpkt PARAMS ((char *buf, int forever)); -extern int putpkt PARAMS ((char *buf)); - -/* Define the target subroutine names */ - -static struct target_ops remote_ops ; - -static void init_remote_ops(void) -{ - remote_ops.to_shortname = "remote"; - remote_ops.to_longname = "Remote serial target in gdb-specific protocol"; - remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\ -Specify the serial device it is connected to (e.g. /dev/ttya)." ; - remote_ops.to_open = remote_open; - remote_ops.to_close = remote_close; - remote_ops.to_attach = NULL; - remote_ops.to_detach = remote_detach; - remote_ops.to_resume = remote_resume; - remote_ops.to_wait = remote_wait; - remote_ops.to_fetch_registers = remote_fetch_registers; - remote_ops.to_store_registers = remote_store_registers; - remote_ops.to_prepare_to_store = remote_prepare_to_store; - remote_ops.to_xfer_memory = remote_xfer_memory; - remote_ops.to_files_info = remote_files_info; - remote_ops.to_insert_breakpoint = remote_insert_breakpoint; - remote_ops.to_remove_breakpoint = remote_remove_breakpoint; - remote_ops.to_terminal_init = NULL; - remote_ops.to_terminal_inferior = NULL; - remote_ops.to_terminal_ours_for_output = NULL; - remote_ops.to_terminal_ours = NULL; - remote_ops.to_terminal_info = NULL; - remote_ops.to_kill = remote_kill; - remote_ops.to_load = generic_load; - remote_ops.to_lookup_symbol = NULL; - remote_ops.to_create_inferior = NULL; - remote_ops.to_mourn_inferior = remote_mourn; - remote_ops.to_can_run = 0; - remote_ops.to_notice_signals = 0; - remote_ops.to_thread_alive = remote_thread_alive; - remote_ops.to_stop = 0; - remote_ops.to_stratum = process_stratum; - remote_ops.DONT_USE = NULL; - remote_ops.to_has_all_memory = 1; - remote_ops.to_has_memory = 1; - remote_ops.to_has_stack = 1; - remote_ops.to_has_registers = 1; - remote_ops.to_has_execution = 1; - remote_ops.to_sections = NULL; - remote_ops.to_sections_end = NULL; - remote_ops.to_magic = OPS_MAGIC ; -} /* init_remote_ops */ - -static struct target_ops extended_remote_ops ; - -static void init_extended_remote_ops(void) -{ - extended_remote_ops.to_shortname = "extended-remote"; - extended_remote_ops.to_longname = "Extended remote serial target in gdb-specific protocol"; - extended_remote_ops.to_doc = "Use a remote computer via a serial line; using a gdb-specific protocol.\n\ -Specify the serial device it is connected to (e.g. /dev/ttya).", - extended_remote_ops.to_open = extended_remote_open; - extended_remote_ops.to_close = remote_close; - extended_remote_ops.to_attach = NULL; - extended_remote_ops.to_detach = remote_detach; - extended_remote_ops.to_resume = remote_resume; - extended_remote_ops.to_wait = remote_wait; - extended_remote_ops.to_fetch_registers = remote_fetch_registers; - extended_remote_ops.to_store_registers = remote_store_registers; - extended_remote_ops.to_prepare_to_store = remote_prepare_to_store; - extended_remote_ops.to_xfer_memory = remote_xfer_memory; - extended_remote_ops.to_files_info = remote_files_info; - extended_remote_ops.to_insert_breakpoint = remote_insert_breakpoint; - extended_remote_ops.to_remove_breakpoint = remote_remove_breakpoint; - extended_remote_ops.to_terminal_init = NULL; - extended_remote_ops.to_terminal_inferior = NULL; - extended_remote_ops.to_terminal_ours_for_output = NULL; - extended_remote_ops.to_terminal_ours = NULL; - extended_remote_ops.to_terminal_info = NULL; - extended_remote_ops.to_kill = remote_kill; - extended_remote_ops.to_load = generic_load; - extended_remote_ops.to_lookup_symbol = NULL; - extended_remote_ops.to_create_inferior = extended_remote_create_inferior; - extended_remote_ops.to_mourn_inferior = extended_remote_mourn; - extended_remote_ops.to_can_run = 0; - extended_remote_ops.to_notice_signals = 0; - extended_remote_ops.to_thread_alive = remote_thread_alive; - extended_remote_ops.to_stop = 0; - extended_remote_ops.to_stratum = process_stratum; - extended_remote_ops.DONT_USE = NULL; - extended_remote_ops.to_has_all_memory = 1; - extended_remote_ops.to_has_memory = 1; - extended_remote_ops.to_has_stack = 1; - extended_remote_ops.to_has_registers = 1; - extended_remote_ops.to_has_execution = 1; - extended_remote_ops.to_sections = NULL; - extended_remote_ops.to_sections_end = NULL; - extended_remote_ops.to_magic = OPS_MAGIC ; -} - - -/* 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. */ - -/* Changed to allow option to set timeout value. - was static int remote_timeout = 2; */ -extern int remote_timeout; - -/* This variable chooses whether to send a ^C or a break when the user - requests program interruption. Although ^C is usually what remote - systems expect, and that is the default here, sometimes a break is - preferable instead. */ - -static int remote_break; - -/* Descriptor for I/O to remote machine. Initialize it to NULL so that - remote_open knows that we don't have a file open when the program - starts. */ -static serial_t remote_desc = NULL; - -/* 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 - -/* 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) - -/* Round up PBUFSIZ to hold all the registers, at least. */ -/* The blank line after the #if seems to be required to work around a - bug in HP's PA compiler. */ -#if REGISTER_BYTES > MAXBUFBYTES - -#undef PBUFSIZ -#define PBUFSIZ (REGISTER_BYTES * 2 + 32) -#endif - -/* This variable sets the number of bytes to be written to the target - in a single packet. Normally PBUFSIZ is satisfactory, but some - targets need smaller values (perhaps because the receiving end - is slow). */ - -static int remote_write_size = PBUFSIZ; - -/* This is the size (in chars) of the first response to the `g' command. This - is used to limit the size of the memory read and write commands to prevent - stub buffers from overflowing. The size does not include headers and - trailers, it is only the payload size. */ - -static int remote_register_buf_size = 0; - -/* Should we try the 'P' request? If this is set to one when the stub - doesn't support 'P', the only consequence is some unnecessary traffic. */ -static int stub_supports_P = 1; - -/* These are pointers to hook functions that may be set in order to - modify resume/wait behavior for a particular architecture. */ - -void (*target_resume_hook) PARAMS ((void)); -void (*target_wait_loop_hook) PARAMS ((void)); - - -/* These are the threads which we last sent to the remote system. -1 for all - or -2 for not sent yet. */ -int general_thread; -int cont_thread; - -static void -set_thread (th, gen) - int th; - int gen; -{ - char buf[PBUFSIZ]; - int state = gen ? general_thread : cont_thread; - if (state == th) - return; - buf[0] = 'H'; - buf[1] = gen ? 'g' : 'c'; - if (th == 42000) - { - buf[2] = '0'; - buf[3] = '\0'; - } - else if (th < 0) - sprintf (&buf[2], "-%x", -th); - else - sprintf (&buf[2], "%x", th); - putpkt (buf); - getpkt (buf, 0); - if (gen) - general_thread = th; - else - cont_thread = th; -} - -/* Return nonzero if the thread TH is still alive on the remote system. */ - -static int -remote_thread_alive (th) - int th; -{ - char buf[PBUFSIZ]; - - buf[0] = 'T'; - if (th < 0) - sprintf (&buf[1], "-%x", -th); - else - sprintf (&buf[1], "%x", th); - putpkt (buf); - getpkt (buf, 0); - return (buf[0] == 'O' && buf[1] == 'K'); -} - -/* Restart the remote side; this is an extended protocol operation. */ - -static void -extended_remote_restart () -{ - char buf[PBUFSIZ]; - - /* Send the restart command; for reasons I don't understand the - remote side really expects a number after the "R". */ - buf[0] = 'R'; - sprintf (&buf[1], "%x", 0); - putpkt (buf); - - /* Now query for status so this looks just like we restarted - gdbserver from scratch. */ - putpkt ("?"); - getpkt (buf, 0); -} - -/* Clean up connection to a remote debugger. */ - -/* ARGSUSED */ -static void -remote_close (quitting) - int quitting; -{ - if (remote_desc) - SERIAL_CLOSE (remote_desc); - remote_desc = NULL; -} - -/* Query the remote side for the text, data and bss offsets. */ - -static void -get_offsets () -{ - char buf[PBUFSIZ], *ptr; - int lose; - CORE_ADDR text_addr, data_addr, bss_addr; - struct section_offsets *offs; - - putpkt ("qOffsets"); - - getpkt (buf, 0); - - if (buf[0] == '\000') - return; /* Return silently. Stub doesn't support this - command. */ - if (buf[0] == 'E') - { - warning ("Remote failure reply: %s", buf); - return; - } - - /* Pick up each field in turn. This used to be done with scanf, but - scanf will make trouble if CORE_ADDR size doesn't match - conversion directives correctly. The following code will work - with any size of CORE_ADDR. */ - text_addr = data_addr = bss_addr = 0; - ptr = buf; - lose = 0; - - if (strncmp (ptr, "Text=", 5) == 0) - { - ptr += 5; - /* Don't use strtol, could lose on big values. */ - while (*ptr && *ptr != ';') - text_addr = (text_addr << 4) + fromhex (*ptr++); - } - else - lose = 1; - - if (!lose && strncmp (ptr, ";Data=", 6) == 0) - { - ptr += 6; - while (*ptr && *ptr != ';') - data_addr = (data_addr << 4) + fromhex (*ptr++); - } - else - lose = 1; - - if (!lose && strncmp (ptr, ";Bss=", 5) == 0) - { - ptr += 5; - while (*ptr && *ptr != ';') - bss_addr = (bss_addr << 4) + fromhex (*ptr++); - } - else - lose = 1; - - if (lose) - error ("Malformed response to offset query, %s", buf); - - if (symfile_objfile == NULL) - return; - - offs = (struct section_offsets *) alloca (sizeof (struct section_offsets) - + symfile_objfile->num_sections - * sizeof (offs->offsets)); - memcpy (offs, symfile_objfile->section_offsets, - sizeof (struct section_offsets) - + symfile_objfile->num_sections - * sizeof (offs->offsets)); - - ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; - - /* This is a temporary kludge to force data and bss to use the same offsets - because that's what nlmconv does now. The real solution requires changes - to the stub and remote.c that I don't have time to do right now. */ - - ANOFFSET (offs, SECT_OFF_DATA) = data_addr; - ANOFFSET (offs, SECT_OFF_BSS) = data_addr; - - objfile_relocate (symfile_objfile, offs); -} - -/* Stub for catch_errors. */ - -static int -remote_start_remote (dummy) - char *dummy; -{ - immediate_quit = 1; /* Allow user to interrupt it */ - - /* Ack any packet which the remote side has already sent. */ - SERIAL_WRITE (remote_desc, "+", 1); - - /* Let the stub know that we want it to return the thread. */ - set_thread (-1, 0); - - get_offsets (); /* Get text, data & bss offsets */ - - putpkt ("?"); /* initiate a query from remote machine */ - immediate_quit = 0; - - start_remote (); /* Initialize gdb process mechanisms */ - return 1; -} - -/* Open a connection to a remote debugger. - NAME is the filename used for communication. */ - -static void -remote_open (name, from_tty) - char *name; - int from_tty; -{ - remote_open_1 (name, from_tty, &remote_ops, 0); -} - -/* Open a connection to a remote debugger using the extended - remote gdb protocol. NAME is the filename used for communication. */ - -static void -extended_remote_open (name, from_tty) - char *name; - int from_tty; -{ - remote_open_1 (name, from_tty, &extended_remote_ops, 1/*extended_p*/); -} - -/* Generic code for opening a connection to a remote target. */ -static DCACHE *remote_dcache; - -static void -remote_open_1 (name, from_tty, target, extended_p) - char *name; - int from_tty; - struct target_ops *target; - int extended_p; -{ - 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 (target); - - remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); - - remote_desc = SERIAL_OPEN (name); - if (!remote_desc) - perror_with_name (name); - - if (baud_rate != -1) - { - if (SERIAL_SETBAUDRATE (remote_desc, baud_rate)) - { - SERIAL_CLOSE (remote_desc); - perror_with_name (name); - } - } - - - SERIAL_RAW (remote_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 (remote_desc); - - if (from_tty) - { - puts_filtered ("Remote debugging using "); - puts_filtered (name); - puts_filtered ("\n"); - } - push_target (target); /* Switch to using remote target now */ - - /* Start out by trying the 'P' request to set registers. We set this each - time that we open a new target so that if the user switches from one - stub to another, we can (if the target is closed and reopened) cope. */ - stub_supports_P = 1; - - general_thread = -2; - cont_thread = -2; - - /* Without this, some commands which require an active target (such as kill) - won't work. This variable serves (at least) double duty as both the pid - of the target process (if it has such), and as a flag indicating that a - target is active. These functions should be split out into seperate - variables, especially since GDB will someday have a notion of debugging - several processes. */ - - inferior_pid = 42000; - /* 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 (remote_start_remote, (char *)0, - "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) - { - pop_target(); - return; - } - - if (extended_p) - { - /* tell the remote that we're using the extended protocol. */ - char buf[PBUFSIZ]; - putpkt ("!"); - getpkt (buf, 0); - } -} - -/* 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 -remote_detach (args, from_tty) - char *args; - int from_tty; -{ - char buf[PBUFSIZ]; - - if (args) - error ("Argument given to \"detach\" when remotely debugging."); - - /* Tell the remote target to detach. */ - strcpy (buf, "D"); - remote_send (buf); - - pop_target (); - if (from_tty) - puts_filtered ("Ending remote debugging.\n"); -} - -/* Convert hex digit A to a number. */ - -int -fromhex (a) - int a; -{ - if (a >= '0' && a <= '9') - return a - '0'; - else if (a >= 'a' && a <= 'f') - return a - 'a' + 10; - else if (a >= 'A' && a <= 'F') - return a - 'A' + 10; - else - error ("Reply contains invalid hex digit %d", a); -} - -/* Convert number NIB to a hex digit. */ - -static int -tohex (nib) - int nib; -{ - if (nib < 10) - return '0'+nib; - else - return 'a'+nib-10; -} - -/* Tell the remote machine to resume. */ - -static enum target_signal last_sent_signal = TARGET_SIGNAL_0; -int last_sent_step; - -static void -remote_resume (pid, step, siggnal) - int pid, step; - enum target_signal siggnal; -{ - char buf[PBUFSIZ]; - - if (pid == -1) - set_thread (inferior_pid, 0); - else - set_thread (pid, 0); - - dcache_flush (remote_dcache); - - last_sent_signal = siggnal; - last_sent_step = step; - - /* A hook for when we need to do something at the last moment before - resumption. */ - if (target_resume_hook) - (*target_resume_hook) (); - - if (siggnal != TARGET_SIGNAL_0) - { - buf[0] = step ? 'S' : 'C'; - buf[1] = tohex (((int)siggnal >> 4) & 0xf); - buf[2] = tohex ((int)siggnal & 0xf); - buf[3] = '\0'; - } - else - strcpy (buf, step ? "s": "c"); - - putpkt (buf); -} - -/* Send ^C to target to halt it. Target will respond, and send us a - packet. */ - -static void -remote_interrupt (signo) - int signo; -{ - /* If this doesn't work, try more severe steps. */ - signal (signo, remote_interrupt_twice); - - if (remote_debug) - printf_unfiltered ("remote_interrupt called\n"); - - /* Send a break or a ^C, depending on user preference. */ - if (remote_break) - SERIAL_SEND_BREAK (remote_desc); - else - SERIAL_WRITE (remote_desc, "\003", 1); -} - -static void (*ofunc)(); - -/* The user typed ^C twice. */ -static void -remote_interrupt_twice (signo) - int signo; -{ - signal (signo, ofunc); - - interrupt_query (); - - signal (signo, remote_interrupt); -} - -/* Ask the user what to do when an interrupt is received. */ - -static void -interrupt_query () -{ - target_terminal_ours (); - - if (query ("Interrupted while waiting for the program.\n\ -Give up (and stop debugging it)? ")) - { - target_mourn_inferior (); - return_to_top_level (RETURN_QUIT); - } - - target_terminal_inferior (); -} - -/* If nonzero, ignore the next kill. */ -int kill_kludge; - -void -remote_console_output (msg) - char *msg; -{ - char *p; - - for (p = msg; *p; p +=2) - { - char tb[2]; - char c = fromhex (p[0]) * 16 + fromhex (p[1]); - tb[0] = c; - tb[1] = 0; - if (target_output_hook) - target_output_hook (tb); - else - fputs_filtered (tb, gdb_stdout); - } -} - -/* 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 int -remote_wait (pid, status) - int pid; - struct target_waitstatus *status; -{ - unsigned char buf[PBUFSIZ]; - int thread_num = -1; - - status->kind = TARGET_WAITKIND_EXITED; - status->value.integer = 0; - - while (1) - { - unsigned char *p; - - ofunc = (void (*)()) signal (SIGINT, remote_interrupt); - getpkt ((char *) buf, 1); - signal (SIGINT, ofunc); - - /* This is a hook for when we need to do something (perhaps the - collection of trace data) every time the target stops. */ - if (target_wait_loop_hook) - (*target_wait_loop_hook) (); - - switch (buf[0]) - { - case 'E': /* Error of some sort */ - warning ("Remote failure reply: %s", buf); - continue; - case 'T': /* Status with PC, SP, FP, ... */ - { - int i; - long regno; - char regs[MAX_REGISTER_RAW_SIZE]; - - /* Expedited reply, containing Signal, {regno, reg} repeat */ - /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where - ss = signal number - n... = register number - r... = register contents - */ - p = &buf[3]; /* after Txx */ - - while (*p) - { - unsigned char *p1; - char *p_temp; - - regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */ - p1 = (unsigned char *)p_temp; - - if (p1 == p) - { - p1 = (unsigned char *) strchr ((const char *) p, ':'); - if (p1 == NULL) - warning ("Malformed packet (missing colon): %s\n\ -Packet: '%s'\n", - p, buf); - if (strncmp ((const char *) p, "thread", p1 - p) == 0) - { - thread_num = strtol ((const char *) ++p1, &p_temp, 16); - p = (unsigned char *)p_temp; - } - } - else - { - p = p1; - - if (*p++ != ':') - warning ("Malformed packet (missing colon): %s\n\ -Packet: '%s'\n", - p, buf); - - if (regno >= NUM_REGS) - warning ("Remote sent bad register number %ld: %s\n\ -Packet: '%s'\n", - regno, p, buf); - - for (i = 0; i < REGISTER_RAW_SIZE (regno); i++) - { - if (p[0] == 0 || p[1] == 0) - warning ("Remote reply is too short: %s", buf); - regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); - p += 2; - } - supply_register (regno, regs); - } - - if (*p++ != ';') - warning ("Remote register badly formatted: %s", buf); - } - } - /* fall through */ - case 'S': /* Old style status, just signal only */ - status->kind = TARGET_WAITKIND_STOPPED; - status->value.sig = (enum target_signal) - (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); - - goto got_status; - case 'W': /* Target exited */ - { - /* The remote process exited. */ - status->kind = TARGET_WAITKIND_EXITED; - status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]); - goto got_status; - } - case 'X': - status->kind = TARGET_WAITKIND_SIGNALLED; - status->value.sig = (enum target_signal) - (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); - kill_kludge = 1; - - goto got_status; - case 'O': /* Console output */ - remote_console_output (buf + 1); - continue; - case '\0': - if (last_sent_signal != TARGET_SIGNAL_0) - { - /* Zero length reply means that we tried 'S' or 'C' and - the remote system doesn't support it. */ - target_terminal_ours_for_output (); - printf_filtered - ("Can't send signals to this remote system. %s not sent.\n", - target_signal_to_name (last_sent_signal)); - last_sent_signal = TARGET_SIGNAL_0; - target_terminal_inferior (); - - strcpy ((char *) buf, last_sent_step ? "s" : "c"); - putpkt ((char *) buf); - continue; - } - /* else fallthrough */ - default: - warning ("Invalid remote reply: %s", buf); - continue; - } - } - got_status: - if (thread_num != -1) - { - /* Initial thread value can only be acquired via wait, so deal with - this marker which is used before the first thread value is - acquired. */ - if (inferior_pid == 42000) - { - inferior_pid = thread_num; - add_thread (inferior_pid); - } - return thread_num; - } - return inferior_pid; -} - -/* Number of bytes of registers this stub implements. */ -static int register_bytes_found; - -/* Read the remote registers into the block REGS. */ -/* Currently we just read all the registers, so we don't use regno. */ -/* ARGSUSED */ -static void -remote_fetch_registers (regno) - int regno; -{ - char buf[PBUFSIZ]; - int i; - char *p; - char regs[REGISTER_BYTES]; - - set_thread (inferior_pid, 1); - - sprintf (buf, "g"); - remote_send (buf); - - if (remote_register_buf_size == 0) - remote_register_buf_size = strlen (buf); - - /* Unimplemented registers read as all bits zero. */ - memset (regs, 0, REGISTER_BYTES); - - /* We can get out of synch in various cases. If the first character - in the buffer is not a hex character, assume that has happened - and try to fetch another packet to read. */ - while ((buf[0] < '0' || buf[0] > '9') - && (buf[0] < 'a' || buf[0] > 'f')) - { - if (remote_debug) - printf_unfiltered ("Bad register packet; fetching a new packet\n"); - getpkt (buf, 0); - } - - /* Reply describes registers byte by byte, each byte encoded as two - hex characters. Suck them all up, then supply them to the - register cacheing/storage mechanism. */ - - p = buf; - for (i = 0; i < REGISTER_BYTES; i++) - { - if (p[0] == 0) - break; - if (p[1] == 0) - { - warning ("Remote reply is of odd length: %s", buf); - /* Don't change register_bytes_found in this case, and don't - print a second warning. */ - goto supply_them; - } - regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); - p += 2; - } - - if (i != register_bytes_found) - { - register_bytes_found = i; -#ifdef REGISTER_BYTES_OK - if (!REGISTER_BYTES_OK (i)) - warning ("Remote reply is too short: %s", buf); -#endif - } - - supply_them: - for (i = 0; i < NUM_REGS; i++) - supply_register (i, ®s[REGISTER_BYTE(i)]); -} - -/* Prepare to store registers. Since we may send them all (using a - 'G' request), we have to read out the ones we don't want to change - first. */ - -static void -remote_prepare_to_store () -{ - /* Make sure the entire registers array is valid. */ - read_register_bytes (0, (char *)NULL, REGISTER_BYTES); -} - -/* Store register REGNO, or all registers if REGNO == -1, from the contents - of REGISTERS. FIXME: ignores errors. */ - -static void -remote_store_registers (regno) - int regno; -{ - char buf[PBUFSIZ]; - int i; - char *p; - - set_thread (inferior_pid, 1); - - if (regno >= 0 && stub_supports_P) - { - /* Try storing a single register. */ - char *regp; - - sprintf (buf, "P%x=", regno); - p = buf + strlen (buf); - regp = ®isters[REGISTER_BYTE (regno)]; - for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i) - { - *p++ = tohex ((regp[i] >> 4) & 0xf); - *p++ = tohex (regp[i] & 0xf); - } - *p = '\0'; - remote_send (buf); - if (buf[0] != '\0') - { - /* The stub understands the 'P' request. We are done. */ - return; - } - - /* The stub does not support the 'P' request. Use 'G' instead, - and don't try using 'P' in the future (it will just waste our - time). */ - stub_supports_P = 0; - } - - buf[0] = 'G'; - - /* Command describes registers byte by byte, - each byte encoded as two hex characters. */ - - p = buf + 1; - /* remote_prepare_to_store insures that register_bytes_found gets set. */ - for (i = 0; i < register_bytes_found; i++) - { - *p++ = tohex ((registers[i] >> 4) & 0xf); - *p++ = tohex (registers[i] & 0xf); - } - *p = '\0'; - - remote_send (buf); -} - -/* - Use of the data cache *used* to be disabled because it loses for looking at - and changing hardware I/O ports and the like. Accepting `volatile' - would perhaps be one way to fix it. Another idea would be to use the - executable file for the text segment (for all SEC_CODE sections? - For all SEC_READONLY sections?). This has problems if you want to - actually see what the memory contains (e.g. self-modifying code, - clobbered memory, user downloaded the wrong thing). - - Because it speeds so much up, it's now enabled, if you're playing - with registers you turn it of (set remotecache 0) -*/ - -/* Read a word from remote address ADDR and return it. - This goes through the data cache. */ - -#if 0 /* unused? */ -static int -remote_fetch_word (addr) - CORE_ADDR addr; -{ - return dcache_fetch (remote_dcache, addr); -} - -/* Write a word WORD into remote address ADDR. - This goes through the data cache. */ - -static void -remote_store_word (addr, word) - CORE_ADDR addr; - int word; -{ - dcache_poke (remote_dcache, addr, word); -} -#endif /* 0 (unused?) */ - - - -/* Return the number of hex digits in num. */ - -static int -hexnumlen (num) - ULONGEST num; -{ - int i; - - for (i = 0; num != 0; i++) - num >>= 4; - - return max (i, 1); -} - -/* 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 -remote_write_bytes (memaddr, myaddr, len) - CORE_ADDR memaddr; - char *myaddr; - int len; -{ - int max_buf_size; /* Max size of packet output buffer */ - int origlen; - - /* Chop the transfer down if necessary */ - - max_buf_size = min (remote_write_size, PBUFSIZ); - if (remote_register_buf_size != 0) - max_buf_size = min (max_buf_size, remote_register_buf_size); - - /* Subtract header overhead from max payload size - $M,:#nn */ - max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4; - - origlen = len; - while (len > 0) - { - char buf[PBUFSIZ]; - char *p; - int todo; - int i; - - todo = min (len, max_buf_size / 2); /* num bytes that will fit */ - - /* FIXME-32x64: Need a version of print_address_numeric which puts the - result in a buffer like sprintf. */ - sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo); - - /* We send target system values byte by byte, in increasing byte addresses, - each byte encoded as two hex characters. */ - - p = buf + strlen (buf); - for (i = 0; i < todo; i++) - { - *p++ = tohex ((myaddr[i] >> 4) & 0xf); - *p++ = tohex (myaddr[i] & 0xf); - } - *p = '\0'; - - putpkt (buf); - getpkt (buf, 0); - - if (buf[0] == 'E') - { - /* There is no correspondance between what the remote protocol uses - for errors and errno codes. We would like a cleaner way of - representing errors (big enough to include errno codes, bfd_error - codes, and others). But for now just return EIO. */ - errno = EIO; - return 0; - } - 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 -remote_read_bytes (memaddr, myaddr, len) - CORE_ADDR memaddr; - char *myaddr; - int len; -{ - int max_buf_size; /* Max size of packet output buffer */ - int origlen; - - /* Chop the transfer down if necessary */ - - max_buf_size = min (remote_write_size, PBUFSIZ); - if (remote_register_buf_size != 0) - max_buf_size = min (max_buf_size, remote_register_buf_size); - - origlen = len; - while (len > 0) - { - char buf[PBUFSIZ]; - char *p; - int todo; - int i; - - todo = min (len, max_buf_size / 2); /* num bytes that will fit */ - - /* FIXME-32x64: Need a version of print_address_numeric which puts the - result in a buffer like sprintf. */ - sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo); - putpkt (buf); - getpkt (buf, 0); - - if (buf[0] == 'E') - { - /* There is no correspondance between what the remote protocol uses - for errors and errno codes. We would like a cleaner way of - representing errors (big enough to include errno codes, bfd_error - codes, and others). But for now just return EIO. */ - errno = EIO; - return 0; - } - - /* Reply describes memory byte by byte, - each byte encoded as two hex characters. */ - - p = buf; - for (i = 0; i < todo; i++) - { - if (p[0] == 0 || p[1] == 0) - /* Reply is short. This means that we were able to read only part - of what we wanted to. */ - return i + (origlen - len); - myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); - p += 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. */ - -/* ARGSUSED */ -static int -remote_xfer_memory(memaddr, myaddr, len, should_write, target) - CORE_ADDR memaddr; - char *myaddr; - int len; - int should_write; - struct target_ops *target; /* ignored */ -{ -#ifdef REMOTE_TRANSLATE_XFER_ADDRESS - CORE_ADDR targaddr; - int targlen; - REMOTE_TRANSLATE_XFER_ADDRESS (memaddr, len, targaddr, targlen); - if (targlen == 0) - return 0; - memaddr = targaddr; - len = targlen; -#endif - - return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write); -} - - -#if 0 -/* Enable after 4.12. */ - -void -remote_search (len, data, mask, startaddr, increment, lorange, hirange - addr_found, data_found) - int len; - char *data; - char *mask; - CORE_ADDR startaddr; - int increment; - CORE_ADDR lorange; - CORE_ADDR hirange; - CORE_ADDR *addr_found; - char *data_found; -{ - if (increment == -4 && len == 4) - { - long mask_long, data_long; - long data_found_long; - CORE_ADDR addr_we_found; - char buf[PBUFSIZ]; - long returned_long[2]; - char *p; - - mask_long = extract_unsigned_integer (mask, len); - data_long = extract_unsigned_integer (data, len); - sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long); - putpkt (buf); - getpkt (buf, 0); - if (buf[0] == '\0') - { - /* The stub doesn't support the 't' request. We might want to - remember this fact, but on the other hand the stub could be - switched on us. Maybe we should remember it only until - the next "target remote". */ - generic_search (len, data, mask, startaddr, increment, lorange, - hirange, addr_found, data_found); - return; - } - - if (buf[0] == 'E') - /* There is no correspondance between what the remote protocol uses - for errors and errno codes. We would like a cleaner way of - representing errors (big enough to include errno codes, bfd_error - codes, and others). But for now just use EIO. */ - memory_error (EIO, startaddr); - p = buf; - addr_we_found = 0; - while (*p != '\0' && *p != ',') - addr_we_found = (addr_we_found << 4) + fromhex (*p++); - if (*p == '\0') - error ("Protocol error: short return for search"); - - data_found_long = 0; - while (*p != '\0' && *p != ',') - data_found_long = (data_found_long << 4) + fromhex (*p++); - /* Ignore anything after this comma, for future extensions. */ - - if (addr_we_found < lorange || addr_we_found >= hirange) - { - *addr_found = 0; - return; - } - - *addr_found = addr_we_found; - *data_found = store_unsigned_integer (data_we_found, len); - return; - } - generic_search (len, data, mask, startaddr, increment, lorange, - hirange, addr_found, data_found); -} -#endif /* 0 */ - -static void -remote_files_info (ignore) - struct target_ops *ignore; -{ - puts_filtered ("Debugging a target over a serial line.\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 (timeout) - int timeout; -{ - int ch; - - ch = SERIAL_READCHAR (remote_desc, timeout); - - 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; - } -} - -/* Send the command in BUF to the remote machine, - and read the reply into BUF. - Report an error if we get an error reply. */ - -static void -remote_send (buf) - char *buf; -{ - putpkt (buf); - getpkt (buf, 0); - - if (buf[0] == 'E') - error ("Remote failure reply: %s", buf); -} - -/* Send a packet to the remote machine, with error checking. - The data of the packet is in BUF. */ - -int -putpkt (buf) - char *buf; -{ - int i; - unsigned char csum = 0; - char buf2[PBUFSIZ]; - int cnt = strlen (buf); - int ch; - int tcount = 0; - char *p; - - /* Copy the packet into buffer BUF2, encapsulating it - and giving it a checksum. */ - - if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */ - abort(); - - p = buf2; - *p++ = '$'; - - for (i = 0; i < cnt; i++) - { - csum += buf[i]; - *p++ = buf[i]; - } - *p++ = '#'; - *p++ = tohex ((csum >> 4) & 0xf); - *p++ = tohex (csum & 0xf); - - /* Send it over and over until we get a positive ack. */ - - while (1) - { - int started_error_output = 0; - - if (remote_debug) - { - *p = '\0'; - printf_unfiltered ("Sending packet: %s...", buf2); - gdb_flush(gdb_stdout); - } - if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) - perror_with_name ("putpkt: write failed"); - - /* read until either a timeout occurs (-2) or '+' is read */ - while (1) - { - ch = readchar (remote_timeout); - - if (remote_debug) - { - switch (ch) - { - case '+': - case SERIAL_TIMEOUT: - case '$': - if (started_error_output) - { - putchar_unfiltered ('\n'); - started_error_output = 0; - } - } - } - - switch (ch) - { - case '+': - if (remote_debug) - printf_unfiltered("Ack\n"); - return 1; - case SERIAL_TIMEOUT: - tcount ++; - if (tcount > 3) - return 0; - break; /* Retransmit buffer */ - case '$': - { - char junkbuf[PBUFSIZ]; - - /* It's probably an old response, and we're out of sync. Just - gobble up the packet and ignore it. */ - getpkt (junkbuf, 0); - continue; /* Now, go look for + */ - } - default: - if (remote_debug) - { - if (!started_error_output) - { - started_error_output = 1; - printf_unfiltered ("putpkt: Junk: "); - } - putchar_unfiltered (ch & 0177); - } - continue; - } - break; /* Here to retransmit */ - } - -#if 0 - /* This is wrong. If doing a long backtrace, the user should be - able to get out next time we call QUIT, without anything as violent - as interrupt_query. If we want to provide a way out of here - without getting to the next QUIT, it should be based on hitting - ^C twice as in remote_wait. */ - if (quit_flag) - { - quit_flag = 0; - interrupt_query (); - } -#endif - } -} - -/* Come here after finding the start of the frame. Collect the rest into BUF, - verifying the checksum, length, and handling run-length compression. - Returns 0 on any error, 1 on success. */ - -static int -read_frame (buf) - char *buf; -{ - unsigned char csum; - char *bp; - int c; - - csum = 0; - bp = buf; - - while (1) - { - c = readchar (remote_timeout); - - switch (c) - { - case SERIAL_TIMEOUT: - if (remote_debug) - puts_filtered ("Timeout in mid-packet, retrying\n"); - return 0; - case '$': - if (remote_debug) - puts_filtered ("Saw new packet start in middle of old one\n"); - return 0; /* Start a new packet, count retries */ - case '#': - { - unsigned char pktcsum; - - *bp = '\000'; - - pktcsum = fromhex (readchar (remote_timeout)) << 4; - pktcsum |= fromhex (readchar (remote_timeout)); - - if (csum == pktcsum) - return 1; - - if (remote_debug) - { - printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", - pktcsum, csum); - puts_filtered (buf); - puts_filtered ("\n"); - } - return 0; - } - case '*': /* Run length encoding */ - csum += c; - c = readchar (remote_timeout); - csum += c; - c = c - ' ' + 3; /* Compute repeat count */ - - - if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1) - { - memset (bp, *(bp - 1), c); - bp += c; - continue; - } - - *bp = '\0'; - printf_filtered ("Repeat count %d too large for buffer: ", c); - puts_filtered (buf); - puts_filtered ("\n"); - return 0; - - default: - if (bp < buf + PBUFSIZ - 1) - { - *bp++ = c; - csum += c; - continue; - } - - *bp = '\0'; - puts_filtered ("Remote packet 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. */ - -void -getpkt (buf, forever) - char *buf; - int forever; -{ - int c; - int tries; - int timeout; - int val; - - strcpy (buf,"timeout"); - - if (forever) - { -#ifdef MAINTENANCE_CMDS - timeout = watchdog > 0 ? watchdog : -1; -#else - timeout = -1; -#endif - } - - else - timeout = remote_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 remote_timeout intervals. */ - - do - { - c = readchar (timeout); - - if (c == SERIAL_TIMEOUT) - { -#ifdef MAINTENANCE_CMDS - if (forever) /* Watchdog went off. Kill the target. */ - { - target_mourn_inferior (); - error ("Watchdog has expired. Target detached.\n"); - } -#endif - if (remote_debug) - puts_filtered ("Timed out.\n"); - goto retry; - } - } - while (c != '$'); - - /* We've found the start of a packet, now collect the data. */ - - val = read_frame (buf); - - if (val == 1) - { - if (remote_debug) - fprintf_unfiltered (gdb_stdout, "Packet received: %s\n", buf); - SERIAL_WRITE (remote_desc, "+", 1); - return; - } - - /* Try the whole thing again. */ - retry: - SERIAL_WRITE (remote_desc, "-", 1); - } - - /* We have tried hard enough, and just can't receive the packet. Give up. */ - - printf_unfiltered ("Ignoring packet error, continuing...\n"); - SERIAL_WRITE (remote_desc, "+", 1); -} - -static void -remote_kill () -{ - /* For some mysterious reason, wait_for_inferior calls kill instead of - mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ - if (kill_kludge) - { - kill_kludge = 0; - target_mourn_inferior (); - return; - } - - /* Use catch_errors so the user can quit from gdb even when we aren't on - speaking terms with the remote system. */ - catch_errors (putpkt, "k", "", RETURN_MASK_ERROR); - - /* Don't wait for it to die. I'm not really sure it matters whether - we do or not. For the existing stubs, kill is a noop. */ - target_mourn_inferior (); -} - -static void -remote_mourn () -{ - remote_mourn_1 (&remote_ops); -} - -static void -extended_remote_mourn () -{ - /* We do _not_ want to mourn the target like this; this will - remove the extended remote target from the target stack, - and the next time the user says "run" it'll fail. - - FIXME: What is the right thing to do here? */ -#if 0 - remote_mourn_1 (&extended_remote_ops); -#endif -} - -/* Worker function for remote_mourn. */ -static void -remote_mourn_1 (target) - struct target_ops *target; -{ - unpush_target (target); - generic_mourn_inferior (); -} - -/* In the extended protocol we want to be able to do things like - "run" and have them basically work as expected. So we need - a special create_inferior function. - - FIXME: One day add support for changing the exec file - we're debugging, arguments and an environment. */ - -static void -extended_remote_create_inferior (exec_file, args, env) - char *exec_file; - char *args; - char **env; -{ - /* Rip out the breakpoints; we'll reinsert them after restarting - the remote server. */ - remove_breakpoints (); - - /* Now restart the remote server. */ - extended_remote_restart (); - - /* Now put the breakpoints back in. This way we're safe if the - restart function works via a unix fork on the remote side. */ - insert_breakpoints (); - - /* Clean up from the last time we were running. */ - clear_proceed_status (); - - /* Let the remote process run. */ - proceed (-1, TARGET_SIGNAL_0, 0); -} - - -/* On some machines, e.g. 68k, we may use a different breakpoint instruction - than other targets; in those use REMOTE_BREAKPOINT instead of just - BREAKPOINT. Also, bi-endian targets may define LITTLE_REMOTE_BREAKPOINT - and BIG_REMOTE_BREAKPOINT. If none of these are defined, we just call - the standard routines that are in mem-break.c. */ - -/* FIXME, these ought to be done in a more dynamic fashion. For instance, - the choice of breakpoint instruction affects target program design and - vice versa, and by making it user-tweakable, the special code here - goes away and we need fewer special GDB configurations. */ - -#if defined (LITTLE_REMOTE_BREAKPOINT) && defined (BIG_REMOTE_BREAKPOINT) && !defined(REMOTE_BREAKPOINT) -#define REMOTE_BREAKPOINT -#endif - -#ifdef REMOTE_BREAKPOINT - -/* If the target isn't bi-endian, just pretend it is. */ -#if !defined (LITTLE_REMOTE_BREAKPOINT) && !defined (BIG_REMOTE_BREAKPOINT) -#define LITTLE_REMOTE_BREAKPOINT REMOTE_BREAKPOINT -#define BIG_REMOTE_BREAKPOINT REMOTE_BREAKPOINT -#endif - -static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT; -static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT; - -#endif /* REMOTE_BREAKPOINT */ - -/* Insert a breakpoint on targets that don't have any better breakpoint - support. We read the contents of the target location and stash it, - then overwrite it with a breakpoint instruction. ADDR is the target - location in the target machine. CONTENTS_CACHE is a pointer to - memory allocated for saving the target contents. It is guaranteed - by the caller to be long enough to save sizeof BREAKPOINT bytes (this - is accomplished via BREAKPOINT_MAX). */ - -static int -remote_insert_breakpoint (addr, contents_cache) - CORE_ADDR addr; - char *contents_cache; -{ -#ifdef REMOTE_BREAKPOINT - int val; - - val = target_read_memory (addr, contents_cache, sizeof big_break_insn); - - if (val == 0) - { - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - val = target_write_memory (addr, (char *) big_break_insn, - sizeof big_break_insn); - else - val = target_write_memory (addr, (char *) little_break_insn, - sizeof little_break_insn); - } - - return val; -#else - return memory_insert_breakpoint (addr, contents_cache); -#endif /* REMOTE_BREAKPOINT */ -} - -static int -remote_remove_breakpoint (addr, contents_cache) - CORE_ADDR addr; - char *contents_cache; -{ -#ifdef REMOTE_BREAKPOINT - return target_write_memory (addr, contents_cache, sizeof big_break_insn); -#else - return memory_remove_breakpoint (addr, contents_cache); -#endif /* REMOTE_BREAKPOINT */ -} - -/* Some targets are only capable of doing downloads, and afterwards they switch - to the remote serial protocol. This function provides a clean way to get - from the download target to the remote target. It's basically just a - wrapper so that we don't have to expose any of the internal workings of - remote.c. - - Prior to calling this routine, you should shutdown the current target code, - else you will get the "A program is being debugged already..." message. - Usually a call to pop_target() suffices. -*/ - -void -push_remote_target (name, from_tty) - char *name; - int from_tty; -{ - printf_filtered ("Switching to remote protocol\n"); - remote_open (name, from_tty); -} - -/* Other targets want to use the entire remote serial module but with - certain remote_ops overridden. */ - -void -open_remote_target (name, from_tty, target, extended_p) - char *name; - int from_tty; - struct target_ops *target; - int extended_p; -{ - printf_filtered ("Selecting the %sremote protocol\n", - (extended_p ? "extended-" : "")); - remote_open_1 (name, from_tty, target, extended_p); -} - /* Table used by the crc32 function to calcuate the checksum. */ static unsigned long crc32_table[256] = {0, 0}; @@ -6291,112 +2128,6 @@ remote_compare_command (args, from_tty) printf_filtered ("No loaded section named '%s'.\n", args); } -/* reload command - - With no arguments, compares each loadable section on the target - with the binary image in the current exec bfd. Sections that - are not identical are downloaded to the target. Depends on the - target understanding the "qCRC:" request. - - Optionally accepts the name of a section as an argument, and - downloads that section; in this case no comparison is done -- - the section is downloaded unconditionally. */ - -static void -remote_reload_command (args, from_tty) - char *args; - int from_tty; -{ - asection *s; - unsigned long host_crc, target_crc; - extern bfd *exec_bfd; - struct cleanup *old_chain; - char *tmp, *sectdata, *sectname, buf[PBUFSIZ]; - bfd_size_type size; - bfd_vma lma; - unsigned long sent, len, l; - int matched = 0; - int err; - - if (!exec_bfd) - error ("command cannot be used without an exec file"); - - for (s = exec_bfd->sections; s; s = s->next) - { - if (!(s->flags & SEC_LOAD)) - continue; /* skip non-loadable section */ - - size = bfd_get_section_size_before_reloc (s); - if (size == 0) - continue; /* skip zero-length section */ - - sectname = (char *) bfd_get_section_name (exec_bfd, s); - if (args && strcmp (args, sectname) != 0) - continue; /* not the section selected by user */ - - matched = 1; /* do this section */ - lma = s->lma; - sectdata = xmalloc (size); - old_chain = make_cleanup (free, sectdata); - bfd_get_section_contents (exec_bfd, s, sectdata, 0, size); - - if (args == 0) - { - /* - * Compare all sections, and reload those that don't match. - */ - - if (!current_target.to_shortname || - strcmp (current_target.to_shortname, "remote") != 0) - error ("command can only be used with remote target"); - - /* FIXME: assumes lma can fit into long */ - sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size); - putpkt (buf); - - /* be clever; compute the host_crc before waiting for target reply */ - host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff); - - getpkt (buf, 0); - if (buf[0] == 'E') - error ("target memory fault, section %s, range 0x%08x -- 0x%08x", - sectname, lma, lma + size); - if (buf[0] != 'C') - error ("remote target does not support this operation"); - - for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++) - target_crc = target_crc * 16 + fromhex (*tmp); - } - - printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ", - sectname, lma, lma + size); - - if (args != 0 || /* section specified -- reload unconditionally */ - host_crc != target_crc) /* section changed on target */ - { - printf_filtered ("being reloaded now.\n"); - l = size / 100; - l = l > 100 ? l : 100; /* chunk size; at least 100 */ - sent = 0; - do - { - len = (size - sent) < l ? (size - sent) : l; - sent += len; - err = target_write_memory (lma, sectdata, len); - lma += len; - sectdata += len; - } - while (err == 0 && sent < size); - } - else - printf_filtered ("unchanged.\n"); - - do_cleanups (old_chain); - } - if (args && !matched) - printf_filtered ("No loaded section named '%s'.\n", args); -} - void _initialize_remote () {