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- /* Memory-access and commands for "inferior" process, for GDB.
- Copyright 1986, 1987, 1988, 1989, 1991, 1992, 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include <signal.h>
- #include <sys/param.h>
- #include <string.h>
- #include "symtab.h"
- #include "gdbtypes.h"
- #include "frame.h"
- #include "inferior.h"
- #include "environ.h"
- #include "value.h"
- #include "gdbcmd.h"
- #include "gdbcore.h"
- #include "target.h"
- #include "language.h"
-
- static void continue_command PARAMS ((char *, int));
-
- static void until_next_command PARAMS ((int));
-
- static void until_command PARAMS ((char *, int));
-
- static void path_info PARAMS ((char *, int));
-
- static void path_command PARAMS ((char *, int));
-
- static void unset_command PARAMS ((char *, int));
-
- static void float_info PARAMS ((char *, int));
-
- static void detach_command PARAMS ((char *, int));
-
- static void nofp_registers_info PARAMS ((char *, int));
-
- static void all_registers_info PARAMS ((char *, int));
-
- static void registers_info PARAMS ((char *, int));
-
- static void do_registers_info PARAMS ((int, int));
-
- static void unset_environment_command PARAMS ((char *, int));
-
- static void set_environment_command PARAMS ((char *, int));
-
- static void environment_info PARAMS ((char *, int));
-
- static void program_info PARAMS ((char *, int));
-
- static void finish_command PARAMS ((char *, int));
-
- static void signal_command PARAMS ((char *, int));
-
- static void jump_command PARAMS ((char *, int));
-
- static void step_1 PARAMS ((int, int, char *));
-
- static void nexti_command PARAMS ((char *, int));
-
- static void stepi_command PARAMS ((char *, int));
-
- static void next_command PARAMS ((char *, int));
-
- static void step_command PARAMS ((char *, int));
-
- static void run_command PARAMS ((char *, int));
-
- #define ERROR_NO_INFERIOR \
- if (!target_has_execution) error ("The program is not being run.");
-
- /* String containing arguments to give to the program, separated by spaces.
- Empty string (pointer to '\0') means no args. */
-
- static char *inferior_args;
-
- /* File name for default use for standard in/out in the inferior. */
-
- char *inferior_io_terminal;
-
- /* Pid of our debugged inferior, or 0 if no inferior now.
- Since various parts of infrun.c test this to see whether there is a program
- being debugged it should be nonzero (currently 3 is used) for remote
- debugging. */
-
- int inferior_pid;
-
- /* Last signal that the inferior received (why it stopped). */
-
- enum target_signal stop_signal;
-
- /* Address at which inferior stopped. */
-
- CORE_ADDR stop_pc;
-
- /* Chain containing status of breakpoint(s) that we have stopped at. */
-
- bpstat stop_bpstat;
-
- /* Flag indicating that a command has proceeded the inferior past the
- current breakpoint. */
-
- int breakpoint_proceeded;
-
- /* Nonzero if stopped due to a step command. */
-
- int stop_step;
-
- /* Nonzero if stopped due to completion of a stack dummy routine. */
-
- int stop_stack_dummy;
-
- /* Nonzero if stopped due to a random (unexpected) signal in inferior
- process. */
-
- int stopped_by_random_signal;
-
- /* Range to single step within.
- If this is nonzero, respond to a single-step signal
- by continuing to step if the pc is in this range. */
-
- CORE_ADDR step_range_start; /* Inclusive */
- CORE_ADDR step_range_end; /* Exclusive */
-
- /* Stack frame address as of when stepping command was issued.
- This is how we know when we step into a subroutine call,
- and how to set the frame for the breakpoint used to step out. */
-
- CORE_ADDR step_frame_address;
-
- /* Our notion of the current stack pointer. */
-
- CORE_ADDR step_sp;
-
- /* 1 means step over all subroutine calls.
- 0 means don't step over calls (used by stepi).
- -1 means step over calls to undebuggable functions. */
-
- int step_over_calls;
-
- /* If stepping, nonzero means step count is > 1
- so don't print frame next time inferior stops
- if it stops due to stepping. */
-
- int step_multi;
-
- /* Environment to use for running inferior,
- in format described in environ.h. */
-
- struct environ *inferior_environ;
-
-
- /* ARGSUSED */
- void
- tty_command (file, from_tty)
- char *file;
- int from_tty;
- {
- if (file == 0)
- error_no_arg ("terminal name for running target process");
-
- inferior_io_terminal = savestring (file, strlen (file));
- }
-
- static void
- run_command (args, from_tty)
- char *args;
- int from_tty;
- {
- char *exec_file;
-
- dont_repeat ();
-
- if (inferior_pid)
- {
- if (
- !query ("The program being debugged has been started already.\n\
- Start it from the beginning? "))
- error ("Program not restarted.");
- target_kill ();
- }
-
- clear_breakpoint_hit_counts ();
-
- exec_file = (char *) get_exec_file (0);
-
- /* The exec file is re-read every time we do a generic_mourn_inferior, so
- we just have to worry about the symbol file. */
- reread_symbols ();
-
- /* We keep symbols from add-symbol-file, on the grounds that the
- user might want to add some symbols before running the program
- (right?). But sometimes (dynamic loading where the user manually
- introduces the new symbols with add-symbol-file), the code which
- the symbols describe does not persist between runs. Currently
- the user has to manually nuke all symbols between runs if they
- want them to go away (PR 2207). This is probably reasonable. */
-
- if (args)
- {
- char *cmd;
- cmd = concat ("set args ", args, NULL);
- make_cleanup (free, cmd);
- execute_command (cmd, from_tty);
- }
-
- if (from_tty)
- {
- puts_filtered("Starting program: ");
- if (exec_file)
- puts_filtered(exec_file);
- puts_filtered(" ");
- puts_filtered(inferior_args);
- puts_filtered("\n");
- gdb_flush (gdb_stdout);
- }
-
- target_create_inferior (exec_file, inferior_args,
- environ_vector (inferior_environ));
- }
-
- static void
- continue_command (proc_count_exp, from_tty)
- char *proc_count_exp;
- int from_tty;
- {
- ERROR_NO_INFERIOR;
-
- /* If have argument, set proceed count of breakpoint we stopped at. */
-
- if (proc_count_exp != NULL)
- {
- bpstat bs = stop_bpstat;
- int num = bpstat_num (&bs);
- if (num == 0 && from_tty)
- {
- printf_filtered
- ("Not stopped at any breakpoint; argument ignored.\n");
- }
- while (num != 0)
- {
- set_ignore_count (num,
- parse_and_eval_address (proc_count_exp) - 1,
- from_tty);
- /* set_ignore_count prints a message ending with a period.
- So print two spaces before "Continuing.". */
- if (from_tty)
- printf_filtered (" ");
- num = bpstat_num (&bs);
- }
- }
-
- if (from_tty)
- printf_filtered ("Continuing.\n");
-
- clear_proceed_status ();
-
- proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
- }
-
- /* Step until outside of current statement. */
-
- /* ARGSUSED */
- static void
- step_command (count_string, from_tty)
- char *count_string;
- int from_tty;
- {
- step_1 (0, 0, count_string);
- }
-
- /* Likewise, but skip over subroutine calls as if single instructions. */
-
- /* ARGSUSED */
- static void
- next_command (count_string, from_tty)
- char *count_string;
- int from_tty;
- {
- step_1 (1, 0, count_string);
- }
-
- /* Likewise, but step only one instruction. */
-
- /* ARGSUSED */
- static void
- stepi_command (count_string, from_tty)
- char *count_string;
- int from_tty;
- {
- step_1 (0, 1, count_string);
- }
-
- /* ARGSUSED */
- static void
- nexti_command (count_string, from_tty)
- char *count_string;
- int from_tty;
- {
- step_1 (1, 1, count_string);
- }
-
- static void
- step_1 (skip_subroutines, single_inst, count_string)
- int skip_subroutines;
- int single_inst;
- char *count_string;
- {
- register int count = 1;
- struct frame_info *frame;
- struct cleanup *cleanups = 0;
-
- ERROR_NO_INFERIOR;
- count = count_string ? parse_and_eval_address (count_string) : 1;
-
- if (!single_inst || skip_subroutines) /* leave si command alone */
- {
- enable_longjmp_breakpoint();
- cleanups = make_cleanup(disable_longjmp_breakpoint, 0);
- }
-
- for (; count > 0; count--)
- {
- clear_proceed_status ();
-
- frame = get_current_frame ();
- if (!frame) /* Avoid coredump here. Why tho? */
- error ("No current frame");
- step_frame_address = FRAME_FP (frame);
- step_sp = read_sp ();
-
- if (! single_inst)
- {
- find_pc_line_pc_range (stop_pc, &step_range_start, &step_range_end);
- if (step_range_end == 0)
- {
- char *name;
- if (find_pc_partial_function (stop_pc, &name, &step_range_start,
- &step_range_end) == 0)
- error ("Cannot find bounds of current function");
-
- target_terminal_ours ();
- printf_filtered ("\
- Single stepping until exit from function %s, \n\
- which has no line number information.\n", name);
- }
- }
- else
- {
- /* Say we are stepping, but stop after one insn whatever it does. */
- step_range_start = step_range_end = 1;
- if (!skip_subroutines)
- /* It is stepi.
- Don't step over function calls, not even to functions lacking
- line numbers. */
- step_over_calls = 0;
- }
-
- if (skip_subroutines)
- step_over_calls = 1;
-
- step_multi = (count > 1);
- proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 1);
- if (! stop_step)
- break;
-
- /* FIXME: On nexti, this may have already been done (when we hit the
- step resume break, I think). Probably this should be moved to
- wait_for_inferior (near the top). */
- #if defined (SHIFT_INST_REGS)
- SHIFT_INST_REGS();
- #endif
- }
-
- if (!single_inst || skip_subroutines)
- do_cleanups(cleanups);
- }
-
- /* Continue program at specified address. */
-
- static void
- jump_command (arg, from_tty)
- char *arg;
- int from_tty;
- {
- register CORE_ADDR addr;
- struct symtabs_and_lines sals;
- struct symtab_and_line sal;
- struct symbol *fn;
- struct symbol *sfn;
-
- ERROR_NO_INFERIOR;
-
- if (!arg)
- error_no_arg ("starting address");
-
- sals = decode_line_spec_1 (arg, 1);
- if (sals.nelts != 1)
- {
- error ("Unreasonable jump request");
- }
-
- sal = sals.sals[0];
- free ((PTR)sals.sals);
-
- if (sal.symtab == 0 && sal.pc == 0)
- error ("No source file has been specified.");
-
- resolve_sal_pc (&sal); /* May error out */
-
- /* See if we are trying to jump to another function. */
- fn = get_frame_function (get_current_frame ());
- sfn = find_pc_function (sal.pc);
- if (fn != NULL && sfn != fn)
- {
- if (!query ("Line %d is not in `%s'. Jump anyway? ", sal.line,
- SYMBOL_SOURCE_NAME (fn)))
- {
- error ("Not confirmed.");
- /* NOTREACHED */
- }
- }
-
- addr = sal.pc;
-
- if (from_tty)
- {
- printf_filtered ("Continuing at ");
- print_address_numeric (addr, 1, gdb_stdout);
- printf_filtered (".\n");
- }
-
- clear_proceed_status ();
- proceed (addr, TARGET_SIGNAL_0, 0);
- }
-
- /* Continue program giving it specified signal. */
-
- static void
- signal_command (signum_exp, from_tty)
- char *signum_exp;
- int from_tty;
- {
- enum target_signal oursig;
-
- dont_repeat (); /* Too dangerous. */
- ERROR_NO_INFERIOR;
-
- if (!signum_exp)
- error_no_arg ("signal number");
-
- /* It would be even slicker to make signal names be valid expressions,
- (the type could be "enum $signal" or some such), then the user could
- assign them to convenience variables. */
- oursig = target_signal_from_name (signum_exp);
-
- if (oursig == TARGET_SIGNAL_UNKNOWN)
- {
- /* No, try numeric. */
- int num = parse_and_eval_address (signum_exp);
-
- if (num == 0)
- oursig = TARGET_SIGNAL_0;
- else
- oursig = target_signal_from_command (num);
- }
-
- if (from_tty)
- {
- if (oursig == TARGET_SIGNAL_0)
- printf_filtered ("Continuing with no signal.\n");
- else
- printf_filtered ("Continuing with signal %s.\n",
- target_signal_to_name (oursig));
- }
-
- clear_proceed_status ();
- /* "signal 0" should not get stuck if we are stopped at a breakpoint.
- FIXME: Neither should "signal foo" but when I tried passing
- (CORE_ADDR)-1 unconditionally I got a testsuite failure which I haven't
- tried to track down yet. */
- proceed (oursig == TARGET_SIGNAL_0 ? (CORE_ADDR) -1 : stop_pc, oursig, 0);
- }
-
- /* Call breakpoint_auto_delete on the current contents of the bpstat
- pointed to by arg (which is really a bpstat *). */
- void
- breakpoint_auto_delete_contents (arg)
- PTR arg;
- {
- breakpoint_auto_delete (*(bpstat *)arg);
- }
-
- /* Execute a "stack dummy", a piece of code stored in the stack
- by the debugger to be executed in the inferior.
-
- To call: first, do PUSH_DUMMY_FRAME.
- Then push the contents of the dummy. It should end with a breakpoint insn.
- Then call here, passing address at which to start the dummy.
-
- The contents of all registers are saved before the dummy frame is popped
- and copied into the buffer BUFFER.
-
- The dummy's frame is automatically popped whenever that break is hit.
- If that is the first time the program stops, run_stack_dummy
- returns to its caller with that frame already gone and returns 0.
- Otherwise, run_stack-dummy returns 1 (the frame will eventually be popped
- when we do hit that breakpoint). */
-
- /* DEBUG HOOK: 4 => return instead of letting the stack dummy run. */
-
- static int stack_dummy_testing = 0;
-
- int
- run_stack_dummy (addr, buffer)
- CORE_ADDR addr;
- char buffer[REGISTER_BYTES];
- {
- struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0);
-
- /* Now proceed, having reached the desired place. */
- clear_proceed_status ();
- if (stack_dummy_testing & 4)
- {
- POP_FRAME;
- return(0);
- }
- #ifdef CALL_DUMMY_BREAKPOINT_OFFSET
- {
- struct breakpoint *bpt;
- struct symtab_and_line sal;
-
- #if CALL_DUMMY_LOCATION != AT_ENTRY_POINT
- sal.pc = addr - CALL_DUMMY_START_OFFSET + CALL_DUMMY_BREAKPOINT_OFFSET;
- #else
- sal.pc = CALL_DUMMY_ADDRESS ();
- #endif
- sal.symtab = NULL;
- sal.line = 0;
-
- /* Set up a FRAME for the dummy frame so we can pass it to
- set_momentary_breakpoint. We need to give the breakpoint a
- frame in case there is only one copy of the dummy (e.g.
- CALL_DUMMY_LOCATION == AFTER_TEXT_END). */
- flush_cached_frames ();
- set_current_frame (create_new_frame (read_fp (), sal.pc));
-
- /* If defined, CALL_DUMMY_BREAKPOINT_OFFSET is where we need to put
- a breakpoint instruction. If not, the call dummy already has the
- breakpoint instruction in it.
-
- addr is the address of the call dummy plus the CALL_DUMMY_START_OFFSET,
- so we need to subtract the CALL_DUMMY_START_OFFSET. */
- bpt = set_momentary_breakpoint (sal,
- get_current_frame (),
- bp_call_dummy);
- bpt->disposition = del;
-
- /* If all error()s out of proceed ended up calling normal_stop (and
- perhaps they should; it already does in the special case of error
- out of resume()), then we wouldn't need this. */
- make_cleanup (breakpoint_auto_delete_contents, &stop_bpstat);
- }
- #endif /* CALL_DUMMY_BREAKPOINT_OFFSET. */
-
- proceed_to_finish = 1; /* We want stop_registers, please... */
- proceed (addr, TARGET_SIGNAL_0, 0);
-
- discard_cleanups (old_cleanups);
-
- if (!stop_stack_dummy)
- return 1;
-
- /* On return, the stack dummy has been popped already. */
-
- memcpy (buffer, stop_registers, sizeof stop_registers);
- return 0;
- }
-
- /* Proceed until we reach a different source line with pc greater than
- our current one or exit the function. We skip calls in both cases.
-
- Note that eventually this command should probably be changed so
- that only source lines are printed out when we hit the breakpoint
- we set. This may involve changes to wait_for_inferior and the
- proceed status code. */
-
- /* ARGSUSED */
- static void
- until_next_command (from_tty)
- int from_tty;
- {
- struct frame_info *frame;
- CORE_ADDR pc;
- struct symbol *func;
- struct symtab_and_line sal;
-
- clear_proceed_status ();
-
- frame = get_current_frame ();
-
- /* Step until either exited from this function or greater
- than the current line (if in symbolic section) or pc (if
- not). */
-
- pc = read_pc ();
- func = find_pc_function (pc);
-
- if (!func)
- {
- struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (pc);
-
- if (msymbol == NULL)
- error ("Execution is not within a known function.");
-
- step_range_start = SYMBOL_VALUE_ADDRESS (msymbol);
- step_range_end = pc;
- }
- else
- {
- sal = find_pc_line (pc, 0);
-
- step_range_start = BLOCK_START (SYMBOL_BLOCK_VALUE (func));
- step_range_end = sal.end;
- }
-
- step_over_calls = 1;
- step_frame_address = FRAME_FP (frame);
- step_sp = read_sp ();
-
- step_multi = 0; /* Only one call to proceed */
-
- proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 1);
- }
-
- static void
- until_command (arg, from_tty)
- char *arg;
- int from_tty;
- {
- if (!target_has_execution)
- error ("The program is not running.");
- if (arg)
- until_break_command (arg, from_tty);
- else
- until_next_command (from_tty);
- }
-
- /* "finish": Set a temporary breakpoint at the place
- the selected frame will return to, then continue. */
-
- static void
- finish_command (arg, from_tty)
- char *arg;
- int from_tty;
- {
- struct symtab_and_line sal;
- register struct frame_info *frame;
- register struct symbol *function;
- struct breakpoint *breakpoint;
- struct cleanup *old_chain;
-
- if (arg)
- error ("The \"finish\" command does not take any arguments.");
- if (!target_has_execution)
- error ("The program is not running.");
- if (selected_frame == NULL)
- error ("No selected frame.");
-
- frame = get_prev_frame (selected_frame);
- if (frame == 0)
- error ("\"finish\" not meaningful in the outermost frame.");
-
- clear_proceed_status ();
-
- sal = find_pc_line (frame->pc, 0);
- sal.pc = frame->pc;
-
- breakpoint = set_momentary_breakpoint (sal, frame, bp_finish);
-
- old_chain = make_cleanup(delete_breakpoint, breakpoint);
-
- /* Find the function we will return from. */
-
- function = find_pc_function (selected_frame->pc);
-
- /* Print info on the selected frame, including level number
- but not source. */
- if (from_tty)
- {
- printf_filtered ("Run till exit from ");
- print_stack_frame (selected_frame, selected_frame_level, 0);
- }
-
- proceed_to_finish = 1; /* We want stop_registers, please... */
- proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
-
- /* Did we stop at our breakpoint? */
- if (bpstat_find_breakpoint(stop_bpstat, breakpoint) != NULL
- && function != 0)
- {
- struct type *value_type;
- register value_ptr val;
- CORE_ADDR funcaddr;
-
- value_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (function));
- if (!value_type)
- fatal ("internal: finish_command: function has no target type");
-
- if (TYPE_CODE (value_type) == TYPE_CODE_VOID)
- return;
-
- funcaddr = BLOCK_START (SYMBOL_BLOCK_VALUE (function));
-
- val = value_being_returned (value_type, stop_registers,
- using_struct_return (value_of_variable (function, NULL),
- funcaddr,
- value_type,
- BLOCK_GCC_COMPILED (SYMBOL_BLOCK_VALUE (function))));
-
- printf_filtered ("Value returned is $%d = ", record_latest_value (val));
- value_print (val, gdb_stdout, 0, Val_no_prettyprint);
- printf_filtered ("\n");
- }
- do_cleanups(old_chain);
- }
-
- /* ARGSUSED */
- static void
- program_info (args, from_tty)
- char *args;
- int from_tty;
- {
- bpstat bs = stop_bpstat;
- int num = bpstat_num (&bs);
-
- if (!target_has_execution)
- {
- printf_filtered ("The program being debugged is not being run.\n");
- return;
- }
-
- target_files_info ();
- printf_filtered ("Program stopped at %s.\n",
- local_hex_string((unsigned long) stop_pc));
- if (stop_step)
- printf_filtered ("It stopped after being stepped.\n");
- else if (num != 0)
- {
- /* There may be several breakpoints in the same place, so this
- isn't as strange as it seems. */
- while (num != 0)
- {
- if (num < 0)
- printf_filtered ("It stopped at a breakpoint that has since been deleted.\n");
- else
- printf_filtered ("It stopped at breakpoint %d.\n", num);
- num = bpstat_num (&bs);
- }
- }
- else if (stop_signal != TARGET_SIGNAL_0)
- {
- printf_filtered ("It stopped with signal %s, %s.\n",
- target_signal_to_name (stop_signal),
- target_signal_to_string (stop_signal));
- }
-
- if (!from_tty)
- printf_filtered ("Type \"info stack\" or \"info registers\" for more information.\n");
- }
-
- static void
- environment_info (var, from_tty)
- char *var;
- int from_tty;
- {
- if (var)
- {
- register char *val = get_in_environ (inferior_environ, var);
- if (val)
- {
- puts_filtered (var);
- puts_filtered (" = ");
- puts_filtered (val);
- puts_filtered ("\n");
- }
- else
- {
- puts_filtered ("Environment variable \"");
- puts_filtered (var);
- puts_filtered ("\" not defined.\n");
- }
- }
- else
- {
- register char **vector = environ_vector (inferior_environ);
- while (*vector)
- {
- puts_filtered (*vector++);
- puts_filtered ("\n");
- }
- }
- }
-
- static void
- set_environment_command (arg, from_tty)
- char *arg;
- int from_tty;
- {
- register char *p, *val, *var;
- int nullset = 0;
-
- if (arg == 0)
- error_no_arg ("environment variable and value");
-
- /* Find seperation between variable name and value */
- p = (char *) strchr (arg, '=');
- val = (char *) strchr (arg, ' ');
-
- if (p != 0 && val != 0)
- {
- /* We have both a space and an equals. If the space is before the
- equals, walk forward over the spaces til we see a nonspace
- (possibly the equals). */
- if (p > val)
- while (*val == ' ')
- val++;
-
- /* Now if the = is after the char following the spaces,
- take the char following the spaces. */
- if (p > val)
- p = val - 1;
- }
- else if (val != 0 && p == 0)
- p = val;
-
- if (p == arg)
- error_no_arg ("environment variable to set");
-
- if (p == 0 || p[1] == 0)
- {
- nullset = 1;
- if (p == 0)
- p = arg + strlen (arg); /* So that savestring below will work */
- }
- else
- {
- /* Not setting variable value to null */
- val = p + 1;
- while (*val == ' ' || *val == '\t')
- val++;
- }
-
- while (p != arg && (p[-1] == ' ' || p[-1] == '\t')) p--;
-
- var = savestring (arg, p - arg);
- if (nullset)
- {
- printf_filtered ("Setting environment variable \"%s\" to null value.\n", var);
- set_in_environ (inferior_environ, var, "");
- }
- else
- set_in_environ (inferior_environ, var, val);
- free (var);
- }
-
- static void
- unset_environment_command (var, from_tty)
- char *var;
- int from_tty;
- {
- if (var == 0)
- {
- /* If there is no argument, delete all environment variables.
- Ask for confirmation if reading from the terminal. */
- if (!from_tty || query ("Delete all environment variables? "))
- {
- free_environ (inferior_environ);
- inferior_environ = make_environ ();
- }
- }
- else
- unset_in_environ (inferior_environ, var);
- }
-
- /* Handle the execution path (PATH variable) */
-
- static const char path_var_name[] = "PATH";
-
- /* ARGSUSED */
- static void
- path_info (args, from_tty)
- char *args;
- int from_tty;
- {
- puts_filtered ("Executable and object file path: ");
- puts_filtered (get_in_environ (inferior_environ, path_var_name));
- puts_filtered ("\n");
- }
-
- /* Add zero or more directories to the front of the execution path. */
-
- static void
- path_command (dirname, from_tty)
- char *dirname;
- int from_tty;
- {
- char *exec_path;
-
- dont_repeat ();
- exec_path = strsave (get_in_environ (inferior_environ, path_var_name));
- mod_path (dirname, &exec_path);
- set_in_environ (inferior_environ, path_var_name, exec_path);
- free (exec_path);
- if (from_tty)
- path_info ((char *)NULL, from_tty);
- }
-
- /* The array of register names. */
-
- char *reg_names[] = REGISTER_NAMES;
-
- /* Print out the machine register regnum. If regnum is -1,
- print all registers (fpregs == 1) or all non-float registers
- (fpregs == 0).
-
- For most machines, having all_registers_info() print the
- register(s) one per line is good enough. If a different format
- is required, (eg, for MIPS or Pyramid 90x, which both have
- lots of regs), or there is an existing convention for showing
- all the registers, define the macro DO_REGISTERS_INFO(regnum, fp)
- to provide that format. */
-
- #if !defined (DO_REGISTERS_INFO)
-
- #define DO_REGISTERS_INFO(regnum, fp) do_registers_info(regnum, fp)
-
- static void
- do_registers_info (regnum, fpregs)
- int regnum;
- int fpregs;
- {
- register int i;
- int numregs = ARCH_NUM_REGS;
-
- for (i = 0; i < numregs; i++)
- {
- char raw_buffer[MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
-
- /* Decide between printing all regs, nonfloat regs, or specific reg. */
- if (regnum == -1) {
- if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT && !fpregs)
- continue;
- } else {
- if (i != regnum)
- continue;
- }
-
- fputs_filtered (reg_names[i], gdb_stdout);
- print_spaces_filtered (15 - strlen (reg_names[i]), gdb_stdout);
-
- /* Get the data in raw format. */
- if (read_relative_register_raw_bytes (i, raw_buffer))
- {
- printf_filtered ("Invalid register contents\n");
- continue;
- }
-
- /* Convert raw data to virtual format if necessary. */
- #ifdef REGISTER_CONVERTIBLE
- if (REGISTER_CONVERTIBLE (i))
- {
- REGISTER_CONVERT_TO_VIRTUAL (i, REGISTER_VIRTUAL_TYPE (i),
- raw_buffer, virtual_buffer);
- }
- else
- #endif
- memcpy (virtual_buffer, raw_buffer,
- REGISTER_VIRTUAL_SIZE (i));
-
- /* If virtual format is floating, print it that way, and in raw hex. */
- if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT)
- {
- register int j;
-
- #ifdef INVALID_FLOAT
- if (INVALID_FLOAT (virtual_buffer, REGISTER_VIRTUAL_SIZE (i)))
- printf_filtered ("<invalid float>");
- else
- #endif
- val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0,
- gdb_stdout, 0, 1, 0, Val_pretty_default);
-
- printf_filtered ("\t(raw 0x");
- for (j = 0; j < REGISTER_RAW_SIZE (i); j++)
- printf_filtered ("%02x", (unsigned char)raw_buffer[j]);
- printf_filtered (")");
- }
-
- /* FIXME! val_print probably can handle all of these cases now... */
-
- /* Else if virtual format is too long for printf,
- print in hex a byte at a time. */
- else if (REGISTER_VIRTUAL_SIZE (i) > sizeof (long))
- {
- register int j;
- printf_filtered ("0x");
- for (j = 0; j < REGISTER_VIRTUAL_SIZE (i); j++)
- printf_filtered ("%02x", (unsigned char)virtual_buffer[j]);
- }
- /* Else print as integer in hex and in decimal. */
- else
- {
- val_print (REGISTER_VIRTUAL_TYPE (i), raw_buffer, 0,
- gdb_stdout, 'x', 1, 0, Val_pretty_default);
- printf_filtered ("\t");
- val_print (REGISTER_VIRTUAL_TYPE (i), raw_buffer, 0,
- gdb_stdout, 0, 1, 0, Val_pretty_default);
- }
-
- /* The SPARC wants to print even-numbered float regs as doubles
- in addition to printing them as floats. */
- #ifdef PRINT_REGISTER_HOOK
- PRINT_REGISTER_HOOK (i);
- #endif
-
- printf_filtered ("\n");
- }
- }
- #endif /* no DO_REGISTERS_INFO. */
-
- static void
- registers_info (addr_exp, fpregs)
- char *addr_exp;
- int fpregs;
- {
- int regnum, numregs;
- register char *end;
-
- if (!target_has_registers)
- error ("The program has no registers now.");
-
- if (!addr_exp)
- {
- DO_REGISTERS_INFO(-1, fpregs);
- return;
- }
-
- do
- {
- if (addr_exp[0] == '$')
- addr_exp++;
- end = addr_exp;
- while (*end != '\0' && *end != ' ' && *end != '\t')
- ++end;
- numregs = ARCH_NUM_REGS;
- for (regnum = 0; regnum < numregs; regnum++)
- if (!strncmp (addr_exp, reg_names[regnum], end - addr_exp)
- && strlen (reg_names[regnum]) == end - addr_exp)
- goto found;
- if (*addr_exp >= '0' && *addr_exp <= '9')
- regnum = atoi (addr_exp); /* Take a number */
- if (regnum >= numregs) /* Bad name, or bad number */
- error ("%.*s: invalid register", end - addr_exp, addr_exp);
-
- found:
- DO_REGISTERS_INFO(regnum, fpregs);
-
- addr_exp = end;
- while (*addr_exp == ' ' || *addr_exp == '\t')
- ++addr_exp;
- } while (*addr_exp != '\0');
- }
-
- static void
- all_registers_info (addr_exp, from_tty)
- char *addr_exp;
- int from_tty;
- {
- registers_info (addr_exp, 1);
- }
-
- static void
- nofp_registers_info (addr_exp, from_tty)
- char *addr_exp;
- int from_tty;
- {
- registers_info (addr_exp, 0);
- }
-
- /*
- * TODO:
- * Should save/restore the tty state since it might be that the
- * program to be debugged was started on this tty and it wants
- * the tty in some state other than what we want. If it's running
- * on another terminal or without a terminal, then saving and
- * restoring the tty state is a harmless no-op.
- * This only needs to be done if we are attaching to a process.
- */
-
- /*
- attach_command --
- takes a program started up outside of gdb and ``attaches'' to it.
- This stops it cold in its tracks and allows us to start debugging it.
- and wait for the trace-trap that results from attaching. */
-
- void
- attach_command (args, from_tty)
- char *args;
- int from_tty;
- {
- dont_repeat (); /* Not for the faint of heart */
-
- if (target_has_execution)
- {
- if (query ("A program is being debugged already. Kill it? "))
- target_kill ();
- else
- error ("Not killed.");
- }
-
- target_attach (args, from_tty);
-
- /* Set up the "saved terminal modes" of the inferior
- based on what modes we are starting it with. */
- target_terminal_init ();
-
- /* Install inferior's terminal modes. */
- target_terminal_inferior ();
-
- /* Set up execution context to know that we should return from
- wait_for_inferior as soon as the target reports a stop. */
- init_wait_for_inferior ();
- clear_proceed_status ();
- stop_soon_quietly = 1;
-
- #ifndef MACH
- /* Mach 3 does not generate any traps when attaching to inferior,
- and to set up frames we can do this. */
-
- wait_for_inferior ();
- #endif
-
- #ifdef SOLIB_ADD
- /* Add shared library symbols from the newly attached process, if any. */
- SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0);
- #endif
-
- normal_stop ();
- }
-
- /*
- * detach_command --
- * takes a program previously attached to and detaches it.
- * The program resumes execution 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. For this
- * to work, it may be necessary for the process to have been
- * previously attached. It *might* work if the program was
- * started via the normal ptrace (PTRACE_TRACEME).
- */
-
- static void
- detach_command (args, from_tty)
- char *args;
- int from_tty;
- {
- dont_repeat (); /* Not for the faint of heart */
- target_detach (args, from_tty);
- }
-
- /* ARGSUSED */
- static void
- float_info (addr_exp, from_tty)
- char *addr_exp;
- int from_tty;
- {
- #ifdef FLOAT_INFO
- FLOAT_INFO;
- #else
- printf_filtered ("No floating point info available for this processor.\n");
- #endif
- }
-
- /* ARGSUSED */
- static void
- unset_command (args, from_tty)
- char *args;
- int from_tty;
- {
- printf_filtered ("\"unset\" must be followed by the name of an unset subcommand.\n");
- help_list (unsetlist, "unset ", -1, gdb_stdout);
- }
-
- void
- _initialize_infcmd ()
- {
- struct cmd_list_element *c;
-
- add_com ("tty", class_run, tty_command,
- "Set terminal for future runs of program being debugged.");
-
- add_show_from_set
- (add_set_cmd ("args", class_run, var_string_noescape, (char *)&inferior_args,
-
- "Set arguments to give program being debugged when it is started.\n\
- Follow this command with any number of args, to be passed to the program.",
- &setlist),
- &showlist);
-
- c = add_cmd
- ("environment", no_class, environment_info,
- "The environment to give the program, or one variable's value.\n\
- With an argument VAR, prints the value of environment variable VAR to\n\
- give the program being debugged. With no arguments, prints the entire\n\
- environment to be given to the program.", &showlist);
- c->completer = noop_completer;
-
- add_prefix_cmd ("unset", no_class, unset_command,
- "Complement to certain \"set\" commands",
- &unsetlist, "unset ", 0, &cmdlist);
-
- c = add_cmd ("environment", class_run, unset_environment_command,
- "Cancel environment variable VAR for the program.\n\
- This does not affect the program until the next \"run\" command.",
- &unsetlist);
- c->completer = noop_completer;
-
- c = add_cmd ("environment", class_run, set_environment_command,
- "Set environment variable value to give the program.\n\
- Arguments are VAR VALUE where VAR is variable name and VALUE is value.\n\
- VALUES of environment variables are uninterpreted strings.\n\
- This does not affect the program until the next \"run\" command.",
- &setlist);
- c->completer = noop_completer;
-
- add_com ("path", class_files, path_command,
- "Add directory DIR(s) to beginning of search path for object files.\n\
- $cwd in the path means the current working directory.\n\
- This path is equivalent to the $PATH shell variable. It is a list of\n\
- directories, separated by colons. These directories are searched to find\n\
- fully linked executable files and separately compiled object files as needed.");
-
- c = add_cmd ("paths", no_class, path_info,
- "Current search path for finding object files.\n\
- $cwd in the path means the current working directory.\n\
- This path is equivalent to the $PATH shell variable. It is a list of\n\
- directories, separated by colons. These directories are searched to find\n\
- fully linked executable files and separately compiled object files as needed.", &showlist);
- c->completer = noop_completer;
-
- add_com ("attach", class_run, attach_command,
- "Attach to a process or file outside of GDB.\n\
- This command attaches to another target, of the same type as your last\n\
- `target' command (`info files' will show your target stack).\n\
- The command may take as argument a process id or a device file.\n\
- For a process id, you must have permission to send the process a signal,\n\
- and it must have the same effective uid as the debugger.\n\
- When using \"attach\", you should use the \"file\" command to specify\n\
- the program running in the process, and to load its symbol table.");
-
- add_com ("detach", class_run, detach_command,
- "Detach a process or file previously attached.\n\
- If a process, it is no longer traced, and it continues its execution. If you\n\
- were debugging a file, the file is closed and gdb no longer accesses it.");
-
- add_com ("signal", class_run, signal_command,
- "Continue program giving it signal specified by the argument.\n\
- An argument of \"0\" means continue program without giving it a signal.");
-
- add_com ("stepi", class_run, stepi_command,
- "Step one instruction exactly.\n\
- Argument N means do this N times (or till program stops for another reason).");
- add_com_alias ("si", "stepi", class_alias, 0);
-
- add_com ("nexti", class_run, nexti_command,
- "Step one instruction, but proceed through subroutine calls.\n\
- Argument N means do this N times (or till program stops for another reason).");
- add_com_alias ("ni", "nexti", class_alias, 0);
-
- add_com ("finish", class_run, finish_command,
- "Execute until selected stack frame returns.\n\
- Upon return, the value returned is printed and put in the value history.");
-
- add_com ("next", class_run, next_command,
- "Step program, proceeding through subroutine calls.\n\
- Like the \"step\" command as long as subroutine calls do not happen;\n\
- when they do, the call is treated as one instruction.\n\
- Argument N means do this N times (or till program stops for another reason).");
- add_com_alias ("n", "next", class_run, 1);
-
- add_com ("step", class_run, step_command,
- "Step program until it reaches a different source line.\n\
- Argument N means do this N times (or till program stops for another reason).");
- add_com_alias ("s", "step", class_run, 1);
-
- add_com ("until", class_run, until_command,
- "Execute until the program reaches a source line greater than the current\n\
- or a specified line or address or function (same args as break command).\n\
- Execution will also stop upon exit from the current stack frame.");
- add_com_alias ("u", "until", class_run, 1);
-
- add_com ("jump", class_run, jump_command,
- "Continue program being debugged at specified line or address.\n\
- Give as argument either LINENUM or *ADDR, where ADDR is an expression\n\
- for an address to start at.");
-
- add_com ("continue", class_run, continue_command,
- "Continue program being debugged, after signal or breakpoint.\n\
- If proceeding from breakpoint, a number N may be used as an argument,\n\
- which means to set the ignore count of that breakpoint to N - 1 (so that\n\
- the breakpoint won't break until the Nth time it is reached).");
- add_com_alias ("c", "cont", class_run, 1);
- add_com_alias ("fg", "cont", class_run, 1);
-
- add_com ("run", class_run, run_command,
- "Start debugged program. You may specify arguments to give it.\n\
- Args may include \"*\", or \"[...]\"; they are expanded using \"sh\".\n\
- Input and output redirection with \">\", \"<\", or \">>\" are also allowed.\n\n\
- With no arguments, uses arguments last specified (with \"run\" or \"set args\").\n\
- To cancel previous arguments and run with no arguments,\n\
- use \"set args\" without arguments.");
- add_com_alias ("r", "run", class_run, 1);
-
- add_info ("registers", nofp_registers_info,
- "List of integer registers and their contents, for selected stack frame.\n\
- Register name as argument means describe only that register.");
-
- add_info ("all-registers", all_registers_info,
- "List of all registers and their contents, for selected stack frame.\n\
- Register name as argument means describe only that register.");
-
- add_info ("program", program_info,
- "Execution status of the program.");
-
- add_info ("float", float_info,
- "Print the status of the floating point unit\n");
-
- inferior_args = savestring ("", 1); /* Initially no args */
- inferior_environ = make_environ ();
- init_environ (inferior_environ);
- }
-