Framework for kernel debugging.
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pk
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gnu/usr.bin/gdb/gdb/kcorelow.c
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318
gnu/usr.bin/gdb/gdb/kcorelow.c
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/* Core dump and executable file functions below target vector, for GDB.
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Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: kcorelow.c,v 1.1 1994/05/17 19:34:51 pk Exp $
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*/
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#ifdef KERNEL_DEBUG
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#include "defs.h"
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "symtab.h"
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#include "command.h"
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#include "bfd.h"
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#include "target.h"
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#include "gdbcore.h"
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static void
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kcore_files_info PARAMS ((struct target_ops *));
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static void
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kcore_close PARAMS ((int));
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static void
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get_kcore_registers PARAMS ((int));
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static char *core_file;
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static kvm_t *core_kd;
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static struct proc *cur_proc;
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/*
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* Read the "thing" at kernel address 'addr' into the space pointed to
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* by point. The length of the "thing" is determined by the type of p.
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* Result is non-zero if transfer fails.
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*/
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#define kvread(addr, p) \
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(target_read_memory((CORE_ADDR)(addr), (char *)(p), sizeof(*(p))))
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static CORE_ADDR
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ksym_lookup(name)
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const char *name;
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{
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struct minimal_symbol *sym;
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sym = lookup_minimal_symbol(name, (struct objfile *)NULL);
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if (sym == NULL)
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error("kernel symbol `%s' not found.", name);
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return SYMBOL_VALUE_ADDRESS(sym);
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}
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static struct proc *
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curProc()
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{
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struct proc *p;
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CORE_ADDR addr = ksym_lookup("curproc");
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if (kvread(addr, &p))
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error("cannot read proc pointer at %x\n", addr);
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return p;
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}
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/*
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* Set the process context to that of the proc structure at
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* system address paddr.
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*/
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static int
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set_proc_context(paddr)
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CORE_ADDR paddr;
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{
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struct proc p;
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if (paddr < bfd_get_start_address (exec_bfd)) /* XXX */
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return (1);
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cur_proc = (struct proc *)paddr;
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#ifdef notyet
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set_kernel_boundaries(cur_proc);
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#endif
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/* Fetch all registers from core file */
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target_fetch_registers (-1);
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/* Now, set up the frame cache, and print the top of stack */
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flush_cached_frames();
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set_current_frame (create_new_frame (read_fp (), read_pc ()));
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select_frame (get_current_frame (), 0);
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return (0);
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}
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/* Discard all vestiges of any previous core file
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and mark data and stack spaces as empty. */
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/* ARGSUSED */
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static void
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kcore_close (quitting)
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int quitting;
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{
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inferior_pid = 0; /* Avoid confusion from thread stuff */
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if (core_kd) {
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kvm_close(core_kd);
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free(core_file);
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core_file = NULL;
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core_kd = NULL;
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}
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}
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/* This routine opens and sets up the core file bfd */
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void
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kcore_open (filename, from_tty)
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char *filename;
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int from_tty;
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{
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const char *p;
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struct cleanup *old_chain;
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char buf[256], *cp;
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int ontop;
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CORE_ADDR addr;
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target_preopen (from_tty);
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if (!filename) {
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error (core_kd?
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"No core file specified. (Use `detach' to stop debugging a core file.)"
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: "No core file specified.");
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}
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filename = tilde_expand (filename);
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if (filename[0] != '/') {
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cp = concat (current_directory, "/", filename, NULL);
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free (filename);
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filename = cp;
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}
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old_chain = make_cleanup (free, filename);
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core_kd = kvm_open (NULL, filename, NULL,
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write_files? O_RDWR: O_RDONLY, 0);
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if (core_kd == NULL)
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perror_with_name (filename);
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/* Looks semi-reasonable. Toss the old core file and work on the new. */
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discard_cleanups (old_chain); /* Don't free filename any more */
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core_file = filename;
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unpush_target (&kcore_ops);
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ontop = !push_target (&kcore_ops);
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/* print out the panic string if there is one */
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if (kvread(ksym_lookup("panicstr"), &addr) == 0 &&
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addr != 0 &&
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target_read_memory(addr, buf, sizeof(buf)) == 0) {
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for (cp = buf; cp < &buf[sizeof(buf)] && *cp; cp++)
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if (!isascii(*cp) || (!isprint(*cp) && !isspace(*cp)))
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*cp = '?';
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*cp = '\0';
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if (buf[0] != '\0')
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printf("panic: %s\n", buf);
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}
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if (!ontop) {
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warning (
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"you won't be able to access this core file until you terminate\n\
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your %s; do ``info files''", current_target->to_longname);
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return;
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}
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/* Now, set up process context, and print the top of stack */
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(void)set_proc_context(curProc());
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print_stack_frame (selected_frame, selected_frame_level, 1);
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}
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void
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kcore_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (args)
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error ("Too many arguments");
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unpush_target (&kcore_ops);
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reinit_frame_cache ();
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if (from_tty)
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printf_filtered ("No kernel core file now.\n");
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}
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/* Get the registers out of a core file. This is the machine-
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independent part. Fetch_core_registers is the machine-dependent
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part, typically implemented in the xm-file for each architecture. */
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/* We just get all the registers, so we don't use regno. */
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/* ARGSUSED */
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static void
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get_kcore_registers (regno)
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int regno;
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{
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struct user *uaddr;
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struct pcb pcb;
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/* find the pcb for the current process */
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if (kvread(&cur_proc->p_addr, &uaddr))
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error("cannot read u area ptr for proc at %#x", cur_proc);
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if (kvread(&uaddr->u_pcb, &pcb))
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error("cannot read pcb at %#x", &uaddr->u_pcb);
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/*
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* Zero out register set then fill in the ones we know about.
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*/
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clear_regs();
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fetch_kcore_registers (&pcb);
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}
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/* If mourn is being called in all the right places, this could be say
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`gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
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static int
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ignore (addr, contents)
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CORE_ADDR addr;
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char *contents;
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{
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return 0;
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}
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static void
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kcore_files_info (t)
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struct target_ops *t;
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{
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printf("\t`%s'\n", core_file);
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}
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static int
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xfer_kmem (memaddr, myaddr, len, write, target)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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int write;
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struct target_ops *target;
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{
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int n;
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n = write ?
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kvm_write(core_kd, memaddr, myaddr, len) :
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kvm_read(core_kd, memaddr, myaddr, len) ;
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if (n < 0)
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return 0;
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return n;
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}
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static void
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set_proc_cmd(arg)
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char *arg;
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{
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CORE_ADDR paddr;
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if (!arg)
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error_no_arg("proc address for new current process");
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if (!kernel_debugging)
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error("not debugging kernel");
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paddr = (CORE_ADDR)parse_and_eval_address(arg);
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if (set_proc_context(paddr))
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error("invalid proc address");
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}
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struct target_ops kcore_ops = {
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"kcore", "Kernel core dump file",
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"Use a core file as a target. Specify the filename of the core file.",
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kcore_open, kcore_close,
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find_default_attach, kcore_detach, 0, 0, /* resume, wait */
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get_kcore_registers,
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0, 0, /* store_regs, prepare_to_store */
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xfer_kmem, kcore_files_info,
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ignore, ignore, /* core_insert_breakpoint, core_remove_breakpoint, */
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0, 0, 0, 0, 0, /* terminal stuff */
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0, 0, 0, /* kill, load, lookup sym */
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find_default_create_inferior, 0, /* mourn_inferior */
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0, /* can_run */
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0, /* notice_signals */
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kcore_stratum, 0, /* next */
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0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */
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0, 0, /* section pointers */
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OPS_MAGIC, /* Always the last thing */
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};
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void
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_initialize_kcorelow()
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{
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add_target (&kcore_ops);
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add_com ("proc", class_obscure, set_proc_cmd, "Set current process context");
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}
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#endif /* KERNEL_DEBUG */
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