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Diffstat (limited to 'gdb/inftarg.c')
-rw-r--r-- | gdb/inftarg.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/gdb/inftarg.c b/gdb/inftarg.c new file mode 100644 index 0000000..ce64437 --- /dev/null +++ b/gdb/inftarg.c @@ -0,0 +1,182 @@ +/* Subroutines for handling an "inferior" (child) process as a target + for debugging, in GDB. + Copyright 1990, 1991 Free Software Foundation, Inc. + Contributed by Cygnus Support. + +This file is part of GDB. + +GDB 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 1, or (at your option) +any later version. + +GDB 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 GDB; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include <stdio.h> +#include "defs.h" +#include "param.h" +#include "frame.h" /* required by inferior.h */ +#include "inferior.h" +#include "target.h" +#include "wait.h" +#include "gdbcore.h" +#include "ieee-float.h" /* Required by REGISTER_CONVERT_TO_XXX */ + +extern int fetch_inferior_registers(); +extern int store_inferior_registers(); +extern int child_xfer_memory(); +extern int memory_insert_breakpoint(), memory_remove_breakpoint(); +extern void terminal_init_inferior(), terminal_ours(), terminal_inferior(); +extern void terminal_ours_for_output(), child_terminal_info(); +extern void kill_inferior(), add_syms_addr_command(); +extern struct value *call_function_by_hand(); +extern void child_resume(); +extern void child_create_inferior(); +extern void child_mourn_inferior(); +extern void child_attach (); + +/* Forward declaration */ +extern struct target_ops child_ops; + +/* Wait for child to do something. Return pid of child, or -1 in case + of error; store status through argument pointer STATUS. */ + +int +child_wait (status) + int *status; +{ + int pid; + + do { + pid = wait (status); + if (pid == -1) /* No more children to wait for */ + { + fprintf (stderr, "Child process unexpectedly missing.\n"); + *status = 42; /* Claim it exited with signal 42 */ + return -1; + } + } while (pid != inferior_pid); /* Some other child died or stopped */ + return pid; +} + + +/* + * child_detach() + * 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 +child_detach (args, from_tty) + char *args; + int from_tty; +{ + int siggnal = 0; + +#ifdef ATTACH_DETACH + if (from_tty) + { + char *exec_file = get_exec_file (0); + if (exec_file == 0) + exec_file = ""; + printf ("Detaching program: %s pid %d\n", + exec_file, inferior_pid); + fflush (stdout); + } + if (args) + siggnal = atoi (args); + + detach (siggnal); + inferior_pid = 0; + unpush_target (&child_ops); /* Pop out of handling an inferior */ +#else + error ("This version of Unix does not support detaching a process."); +#endif +} + +/* Get ready to modify the registers array. On machines which store + individual registers, this doesn't need to do anything. On machines + which store all the registers in one fell swoop, this makes sure + that registers contains all the registers from the program being + debugged. */ + +void +child_prepare_to_store () +{ +#ifdef CHILD_PREPARE_TO_STORE + CHILD_PREPARE_TO_STORE (); +#endif +} + +/* Convert data from raw format for register REGNUM + to virtual format for register REGNUM. */ + +void +host_convert_to_virtual (regnum, from, to) + int regnum; + char *from; + char *to; +{ + REGISTER_CONVERT_TO_VIRTUAL (regnum, from, to); +} + +/* Convert data from virtual format for register REGNUM + to raw format for register REGNUM. */ + +void +host_convert_from_virtual (regnum, from, to) + int regnum; + char *from; + char *to; +{ + REGISTER_CONVERT_TO_RAW (regnum, from, to); +} + +/* Print status information about what we're accessing. */ + +static void +child_files_info () +{ + printf ("\tUsing the running image of %s process %d.\n", + attach_flag? "attached": "child", inferior_pid); +} + +struct target_ops child_ops = { + "child", "Unix child process", + 0, 0, /* open, close */ + child_attach, child_detach, + child_resume, + child_wait, + fetch_inferior_registers, store_inferior_registers, + child_prepare_to_store, + host_convert_to_virtual, host_convert_from_virtual, + child_xfer_memory, child_files_info, + memory_insert_breakpoint, memory_remove_breakpoint, + terminal_init_inferior, terminal_inferior, + terminal_ours_for_output, terminal_ours, child_terminal_info, + kill_inferior, 0, add_syms_addr_command, /* load */ + call_function_by_hand, + 0, /* lookup_symbol */ + child_create_inferior, child_mourn_inferior, + process_stratum, 0, /* next */ + 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ + OPS_MAGIC, /* Always the last thing */ +}; + +void +_initialize_inftarg () +{ + add_target (&child_ops); +} |