diff options
Diffstat (limited to 'gdb/remote-sim.c')
| -rw-r--r-- | gdb/remote-sim.c | 452 |
1 files changed, 317 insertions, 135 deletions
diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c index 310b75d..1da0172 100644 --- a/gdb/remote-sim.c +++ b/gdb/remote-sim.c @@ -1,7 +1,7 @@ -/* Remote debugging interface for generalized simulator - Copyright 1992 Free Software Foundation, Inc. - Contributed by Cygnus Support. Written by Steve Chamberlain - (sac@cygnus.com). +/* Generic remote debugging interface for simulators. + Copyright 1993 Free Software Foundation, Inc. + Contributed by Cygnus Support. + Steve Chamberlain (sac@cygnus.com) and Doug Evans (dje@cygnus.com). This file is part of GDB. @@ -32,60 +32,147 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "terminal.h" #include "target.h" #include "gdbcore.h" +#include "remote-sim.h" + +/* Naming convention: + + sim_* are the interface to the simulator (see remote-sim.h). + + gdbsim_* are stuff which is internal to gdb. */ /* Forward data declarations */ -extern struct target_ops sim_ops; /* Forward declaration */ +extern struct target_ops gdbsim_ops; -int -sim_write_inferior_memory (memaddr, myaddr, len) - CORE_ADDR memaddr; - unsigned char *myaddr; +static int program_loaded = 0; + +static void +dump_mem (buf, len) + char *buf; int len; { - return sim_write(memaddr, myaddr, len); + if (len <= 8) + { + if (len == 8 || len == 4) + { + long l[2]; + memcpy (l, buf, len); + printf_filtered ("\t0x%x", l[0]); + printf_filtered (len == 8 ? " 0x%x\n" : "\n", l[1]); + } + else + { + int i; + printf_filtered ("\t"); + for (i = 0; i < len; i++) + printf_filtered ("0x%x ", buf[i]); + printf_filtered ("\n"); + } + } +} + +static void +gdbsim_fetch_register (regno) +int regno; +{ + if (regno == -1) + { + for (regno = 0; regno < NUM_REGS; regno++) + gdbsim_fetch_register (regno); + } + else + { + char buf[MAX_REGISTER_RAW_SIZE]; + + sim_fetch_register (regno, buf); + supply_register (regno, buf); + if (sr_get_debug ()) + { + printf_filtered ("gdbsim_fetch_register: %d", regno); + /* FIXME: We could print something more intelligible. */ + dump_mem (buf, REGISTER_RAW_SIZE (regno)); + } + } } static void -store_register(regno) +gdbsim_store_register (regno) int regno; { if (regno == -1) - { - for (regno = 0; regno < NUM_REGS; regno++) - store_register(regno); - } - else - { - sim_store_register(regno, read_register(regno)); - } + { + for (regno = 0; regno < NUM_REGS; regno++) + gdbsim_store_register (regno); + } + else + { + /* FIXME: Until read_register() returns LONGEST, we have this. */ + char value[MAX_REGISTER_RAW_SIZE]; + + read_register_gen (regno, value); + SWAP_TARGET_AND_HOST (value, REGISTER_RAW_SIZE (regno)); + sim_store_register (regno, value); + if (sr_get_debug ()) + { + printf_filtered ("gdbsim_store_register: %d", regno); + /* FIXME: We could print something more intelligible. */ + dump_mem (value, REGISTER_RAW_SIZE (regno)); + } + } } +static void +gdbsim_kill () +{ + if (sr_get_debug ()) + printf_filtered ("gdbsim_kill\n"); + + sim_kill (); /* close fd's, remove mappings */ + inferior_pid = 0; +} + +/* Load an executable file into the target process. This is expected to + not only bring new code into the target process, but also to update + GDB's symbol tables to match. */ -/* - * Download a file specified in 'args', to the sim. - */ static void -sim_load(args,fromtty) -char *args; -int fromtty; +gdbsim_load (prog, fromtty) + char *prog; + int fromtty; { bfd *abfd; - asection *s; + + if (sr_get_debug ()) + printf_filtered ("gdbsim_load: prog \"%s\"\n", prog); inferior_pid = 0; - abfd = bfd_openr (args, (char*)gnutarget); + program_loaded = 0; + abfd = bfd_openr (prog, gnutarget); if (!abfd) - { - printf_filtered("Unable to open file %s\n", args); + error ("Unable to open file %s.", prog); + + if (bfd_check_format (abfd, bfd_object) == 0) + error ("File is not an object file."); + + if (sim_load (abfd, prog) != 0) return; - } - if (bfd_check_format(abfd, bfd_object) ==0) - { - printf_filtered("File is not an object file\n"); - return ; - } + program_loaded = 1; + + sim_set_pc (abfd->start_address); +} + +/* + * This is a utility routine that sim_load() can call to do the work. + * The result is 0 for success, non-zero for failure. + * + * Eg: int sim_load (bfd *bfd, char *prog) { return sim_load_standard (bfd); } + */ + +sim_load_standard (abfd) + bfd *abfd; +{ + asection *s; s = abfd->sections; while (s != (asection *)NULL) @@ -94,196 +181,291 @@ int fromtty; { int i; int delta = 4096; - char *buffer = xmalloc(delta); - printf_filtered("%s\t: 0x%4x .. 0x%4x ", + char *buffer = xmalloc (delta); + printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, s->vma + s->_raw_size); for (i = 0; i < s->_raw_size; i+= delta) { int sub_delta = delta; if (sub_delta > s->_raw_size - i) - sub_delta = s->_raw_size - i ; + sub_delta = s->_raw_size - i ; - bfd_get_section_contents(abfd, s, buffer, i, sub_delta); - sim_write_inferior_memory(s->vma + i, buffer, sub_delta); - printf_filtered("*"); - fflush(stdout); + bfd_get_section_contents (abfd, s, buffer, i, sub_delta); + sim_write (s->vma + i, buffer, sub_delta); + printf_filtered ("*"); + fflush (stdout); } - printf_filtered( "\n"); - free(buffer); + printf_filtered ("\n"); + free (buffer); } s = s->next; } - sim_store_register(PC_REGNUM, abfd->start_address); + return 0; } +/* Start an inferior process and set inferior_pid to its pid. + EXEC_FILE is the file to run. + ALLARGS is a string containing the arguments to the program. + ENV is the environment vector to pass. Errors reported with error(). + On VxWorks and various standalone systems, we ignore exec_file. */ /* This is called not only when we first attach, but also when the user types "run" after having attached. */ -void -sim_create_inferior (execfile, args, env) - char *execfile; + +static void +gdbsim_create_inferior (exec_file, args, env) + char *exec_file; char *args; char **env; { - int entry_pt; + int len,entry_pt; + char *arg_buf,**argv; - if (args && *args) - error ("Can't pass arguments to remote sim process."); + if (! program_loaded) + error ("No program loaded."); - if (execfile == 0 || exec_bfd == 0) - error ("No exec file specified"); + if (sr_get_debug ()) + printf_filtered ("gdbsim_create_inferior: exec_file \"%s\", args \"%s\"\n", + exec_file, args); + + if (exec_file == 0 || exec_bfd == 0) + error ("No exec file specified."); entry_pt = (int) bfd_get_start_address (exec_bfd); + + gdbsim_kill (NULL, NULL); + remove_breakpoints (); init_wait_for_inferior (); - insert_breakpoints (); - proceed(entry_pt, -1, 0); -} + len = 5 + strlen (exec_file) + 1 + strlen (args) + 1 + /*slop*/ 10; + arg_buf = (char *) alloca (len); + arg_buf[0] = '\0'; + strcat (arg_buf, exec_file); + strcat (arg_buf, " "); + strcat (arg_buf, args); + argv = buildargv (arg_buf); + make_cleanup (freeargv, (char *) argv); + /* FIXME: remote-sim.h says targets that don't support this return + non-zero. Perhaps distinguish between "not supported" and other errors? + Or maybe that can be the only error. */ + if (sim_set_args (argv, env) != 0) + return; + + inferior_pid = 42; + insert_breakpoints (); /* Needed to get correct instruction in cache */ + proceed (entry_pt, -1, 0); +} +/* The open routine takes the rest of the parameters from the command, + and (if successful) pushes a new target onto the stack. + Targets should supply this routine, if only to provide an error message. */ +/* Called when selecting the simulator. EG: (gdb) target sim name. */ static void -sim_open (name, from_tty) - char *name; +gdbsim_open (args, from_tty) + char *args; int from_tty; { - if(name == 0) - { - name = ""; - } - push_target (&sim_ops); - target_fetch_registers(-1); - printf_filtered("Connected to the simulator.\n"); + if (sr_get_debug ()) + printf_filtered ("gdbsim_open: args \"%s\"\n", args); + + if (sim_open (args) != 0) + { + /* FIXME: This is totally bogus. sim_open should have a way to + tell us what the error was, so we can tell the user. */ + error ("Unable to initialize simulator (insufficient memory?)."); + return; + } + + push_target (&gdbsim_ops); + target_fetch_registers (-1); + + printf_filtered ("Connected to the simulator.\n"); } +/* Does whatever cleanup is required for a target that we are no longer + going to be calling. Argument says whether we are quitting gdb and + should not get hung in case of errors, or whether we want a clean + termination even if it takes a while. This routine is automatically + always called just before a routine is popped off the target stack. + Closing file descriptors and freeing memory are typical things it should + do. */ /* Close out all files and local state before this target loses control. */ static void -sim_close (quitting) +gdbsim_close (quitting) int quitting; { + if (sr_get_debug ()) + printf_filtered ("gdbsim_close: quitting %d\n", quitting); + + program_loaded = 0; + + /* FIXME: Need to call sim_close() to close all files and + delete all mappings. */ } +/* Takes a program previously attached to and detaches it. + The program may resume execution (some targets do, some don't) and will + no longer stop on signals, etc. We better not have left any breakpoints + in the program or it'll die when it hits one. ARGS is arguments + typed by the user (e.g. a signal to send the process). FROM_TTY + says whether to be verbose or not. */ /* Terminate the open connection to the remote debugger. - Use this when you want to detach and do something else - with your gdb. */ -void -sim_detach (args,from_tty) + Use this when you want to detach and do something else with your gdb. */ + +static void +gdbsim_detach (args,from_tty) char *args; int from_tty; { - pop_target(); /* calls sim_close to do the real work */ - if (from_tty) - printf_filtered ("Ending remote %s debugging\n", target_shortname); + if (sr_get_debug ()) + printf_filtered ("gdbsim_detach: args \"%s\"\n", args); + pop_target (); /* calls gdbsim_close to do the real work */ + if (from_tty) + printf_filtered ("Ending simulator %s debugging\n", target_shortname); } -/* Tell the remote machine to resume. */ +/* Resume execution of the target process. STEP says whether to single-step + or to run free; SIGGNAL is the signal value (e.g. SIGINT) to be given + to the target, or zero for no signal. */ + +static void +gdbsim_resume (pid, step, siggnal) + int pid, step, siggnal; +{ + if (sr_get_debug ()) + printf_filtered ("gdbsim_resume: step %d, signal %d\n", step, siggnal); + sim_resume (step, siggnal); +} -/* Wait until the remote machine stops, then return, - storing status in STATUS just as `wait' would. */ +/* Wait for inferior process to do something. Return pid of child, + or -1 in case of error; store status through argument pointer STATUS, + just as `wait' would. */ -int -sim_wait (status) +static int +gdbsim_wait (status) WAITTYPE *status; { - WSETSTOP(*status, sim_stop_signal()); + if (sr_get_debug ()) + printf_filtered ("gdbsim_wait: "); +#if 1 + *status = sim_stop_signal (); +#else + WSETSTOP (*status, sim_stop_signal ()); +#endif + if (sr_get_debug ()) + printf_filtered ("status %d\n", *status); return 0; } +/* Get ready to modify the registers array. On machines which store + individual registers, this doesn't need to do anything. On machines + which store all the registers in one fell swoop, this makes sure + that registers contains all the registers from the program being + debugged. */ + static void -fetch_register(regno) - int regno; +gdbsim_prepare_to_store () { - if (regno == -1) - { - for (regno = 0; regno < NUM_REGS; regno++) - fetch_register(regno); - } - else - { - char buf[MAX_REGISTER_RAW_SIZE]; - - sim_fetch_register(regno, buf); - supply_register(regno, buf); - } + /* Do nothing, since we can store individual regs */ } - -int -sim_xfer_inferior_memory(memaddr, myaddr, len, write, target) +static int +gdbsim_xfer_inferior_memory (memaddr, myaddr, len, write, target) CORE_ADDR memaddr; char *myaddr; int len; int write; struct target_ops *target; /* ignored */ { + if (! program_loaded) + error ("No program loaded."); + + if (sr_get_debug ()) + { + printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x%x, memaddr 0x%x, len %d, write %d\n", + myaddr, memaddr, len, write); + if (sr_get_debug () && write) + dump_mem(myaddr, len); + } + if (write) - { - sim_write(memaddr, myaddr, len); - } + { + len = sim_write (memaddr, myaddr, len); + } else - { - sim_read(memaddr, myaddr, len); - } + { + len = sim_read (memaddr, myaddr, len); + if (sr_get_debug () && len > 0) + dump_mem(myaddr, len); + } return len; } +static void +gdbsim_files_info (target) + struct target_ops *target; +{ + char *file = "nothing"; -/* This routine is run as a hook, just before the main command loop is - entered. If gdb is configured for the H8, but has not had its - target specified yet, this will loop prompting the user to do so. -*/ + if (exec_bfd) + file = bfd_get_filename (exec_bfd); -void -sim_before_main_loop () -{ - push_target (&sim_ops); + if (sr_get_debug ()) + printf_filtered ("gdbsim_files_info: file \"%s\"\n", file); + + if (exec_bfd) + { + printf_filtered ("\tAttached to %s running program %s\n", + target_shortname, file); + sim_info (); + } } +/* Clear the sims notion of what the break points are. */ -static void rem_resume(pid, a , b) -{ - sim_resume(a,b); -} +static void +gdbsim_mourn_inferior () +{ + if (sr_get_debug ()) + printf_filtered ("gdbsim_mourn_inferior:\n"); -void -pstore() -{ + remove_breakpoints (); + generic_mourn_inferior (); } + /* Define the target subroutine names */ -struct target_ops sim_ops = +struct target_ops gdbsim_ops = { "sim", "simulator", "Use the simulator", - sim_open, sim_close, - 0, sim_detach, rem_resume, sim_wait, /* attach */ - fetch_register, store_register, - pstore, - sim_xfer_inferior_memory, - 0, - 0, 0, /* Breakpoints */ + gdbsim_open, gdbsim_close, + 0, gdbsim_detach, gdbsim_resume, gdbsim_wait, /* attach */ + gdbsim_fetch_register, gdbsim_store_register, + gdbsim_prepare_to_store, + gdbsim_xfer_inferior_memory, + gdbsim_files_info, + 0, 0, /* Breakpoints */ 0, 0, 0, 0, 0, /* Terminal handling */ - pstore, - sim_load, + gdbsim_kill, /* kill */ + gdbsim_load, 0, /* lookup_symbol */ - sim_create_inferior, /* create_inferior */ - pstore, /* mourn_inferior FIXME */ + gdbsim_create_inferior, /* create_inferior */ + gdbsim_mourn_inferior, /* mourn_inferior */ 0, /* can_run */ 0, /* notice_signals */ process_stratum, 0, /* next */ 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ - 0,0, /* Section pointers */ + 0, 0, /* Section pointers */ OPS_MAGIC, /* Always the last thing */ }; -/***********************************************************************/ - void _initialize_remote_sim () { - add_target (&sim_ops); + add_target (&gdbsim_ops); } - - |