996 lines
24 KiB
C
996 lines
24 KiB
C
/* Live and postmortem kernel debugging functions for FreeBSD.
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Copyright 1996 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* $FreeBSD$ */
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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 <paths.h>
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#include <sys/sysctl.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 "symfile.h"
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#include "objfiles.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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#include <sys/stat.h>
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#include <unistd.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <machine/vmparam.h>
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#include <machine/pcb.h>
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#include <machine/tss.h>
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#include <machine/frame.h>
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#include <machine/globaldata.h>
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static void kcore_files_info PARAMS ((struct target_ops *));
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static void kcore_close PARAMS ((int));
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static void get_kcore_registers PARAMS ((int));
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static int kcore_xfer_kmem PARAMS ((CORE_ADDR, char *, int, int, struct target_ops *));
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static int xfer_umem PARAMS ((CORE_ADDR, char *, int, int));
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static CORE_ADDR ksym_lookup PARAMS ((const char *));
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static int read_pcb PARAMS ((int, CORE_ADDR));
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static struct proc * curProc PARAMS ((void));
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static int set_proc_context PARAMS ((CORE_ADDR paddr));
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static void kcore_open PARAMS ((char *filename, int from_tty));
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static void kcore_detach PARAMS ((char *args, int from_tty));
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static void set_proc_cmd PARAMS ((char *arg, int from_tty));
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static void set_cpu_cmd PARAMS ((char *arg, int from_tty));
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static CORE_ADDR kvtophys PARAMS ((int, CORE_ADDR));
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static int physrd PARAMS ((int, u_int, char*, int));
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static int kvm_open PARAMS ((const char *efile, char *cfile, char *sfile,
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int perm, char *errout));
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static int kvm_close PARAMS ((int fd));
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static int kvm_write PARAMS ((int core_kd, CORE_ADDR memaddr,
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char *myaddr, int len));
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static int kvm_read PARAMS ((int core_kd, CORE_ADDR memaddr,
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char *myaddr, int len));
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static int kvm_uread PARAMS ((int core_kd, struct proc *p,
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CORE_ADDR memaddr, char *myaddr,
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int len));
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static int kernel_core_file_hook PARAMS ((int fd, CORE_ADDR addr,
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char *buf, int len));
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static CORE_ADDR kvm_getpcpu PARAMS ((int cfd, int cpuid));
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static struct kinfo_proc * kvm_getprocs PARAMS ((int cfd, int op,
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CORE_ADDR proc, int *cnt));
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extern struct target_ops kcore_ops; /* Forward decl */
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/* Non-zero means we are debugging a kernel core file */
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int kernel_debugging = 0;
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int kernel_writablecore = 0;
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static char *core_file;
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static int core_kd = -1;
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static struct proc *cur_proc;
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static CORE_ADDR kernel_start;
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static CORE_ADDR pcpu;
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#define PCPU_OFFSET(name) \
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offsetof(struct globaldata, gd_ ## name)
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/*
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* Symbol names of kernel entry points. Use special frames.
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*/
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#define KSYM_TRAP "calltrap"
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#define KSYM_INTERRUPT "Xresume"
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#define KSYM_SYSCALL "Xsyscall"
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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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/*
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* The following is FreeBSD-specific hackery to decode special frames
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* and elide the assembly-language stub. This could be made faster by
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* defining a frame_type field in the machine-dependent frame information,
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* but we don't think that's too important right now.
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*/
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enum frametype { tf_normal, tf_trap, tf_interrupt, tf_syscall };
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CORE_ADDR
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fbsd_kern_frame_saved_pc (fr)
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struct frame_info *fr;
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{
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struct minimal_symbol *sym;
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CORE_ADDR this_saved_pc;
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enum frametype frametype;
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this_saved_pc = read_memory_integer (fr->frame + 4, 4);
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sym = lookup_minimal_symbol_by_pc (this_saved_pc);
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frametype = tf_normal;
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if (sym != NULL) {
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if (strcmp (SYMBOL_NAME(sym), KSYM_TRAP) == 0)
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frametype = tf_trap;
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else if (strncmp (SYMBOL_NAME(sym), KSYM_INTERRUPT, 7) == 0)
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frametype = tf_interrupt;
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else if (strcmp (SYMBOL_NAME(sym), KSYM_SYSCALL) == 0)
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frametype = tf_syscall;
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}
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switch (frametype) {
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case tf_normal:
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return (this_saved_pc);
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#define oEIP offsetof(struct trapframe, tf_eip)
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case tf_trap:
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return (read_memory_integer (fr->frame + 8 + oEIP, 4));
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case tf_interrupt:
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return (read_memory_integer (fr->frame + 16 + oEIP, 4));
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case tf_syscall:
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return (read_memory_integer (fr->frame + 8 + oEIP, 4));
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#undef oEIP
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}
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}
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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, NULL, 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 = pcpu + PCPU_OFFSET (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 < kernel_start)
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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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{
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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 = -1;
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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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static 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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struct pcb pcb;
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target_preopen (from_tty);
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unpush_target (&kcore_ops);
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if (!filename)
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{
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/*error (core_kd?*/
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error ( (core_kd >= 0)?
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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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{
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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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/*
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* gdb doesn't really do anything if the exec-file couldn't
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* be opened (in that case exec_bfd is NULL). Usually that's
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* no big deal, but kvm_open needs the exec-file's name,
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* which results in dereferencing a NULL pointer, a real NO-NO !
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* So, check here if the open of the exec-file succeeded.
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*/
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if (exec_bfd == NULL) /* the open failed */
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error ("kgdb could not open the exec-file, please check the name you used !");
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core_kd = kvm_open (exec_bfd->filename, filename, NULL,
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kernel_writablecore? O_RDWR : O_RDONLY, "kgdb: ");
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if (core_kd < 0)
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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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ontop = !push_target (&kcore_ops);
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kernel_start = bfd_get_start_address (exec_bfd); /* XXX */
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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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{
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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 ("panicstr: %s\n", buf);
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}
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/* Print all the panic messages if possible. */
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if (symfile_objfile != NULL)
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{
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printf ("panic messages:\n---\n");
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snprintf (buf, sizeof buf,
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"/sbin/dmesg -N %s -M %s | \
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/usr/bin/awk '/^(panic:|Fatal trap) / { printing = 1 } \
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{ if (printing) print $0 }'",
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symfile_objfile->name, filename);
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fflush(stdout);
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system (buf);
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printf ("---\n");
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}
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if (!ontop)
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{
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warning ("you won't be able to access this core file until you terminate\n\
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your %s; do ``info files''", target_longname);
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return;
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}
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/* we may need this later */
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cur_proc = (struct proc *)curProc ();
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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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print_stack_frame (selected_frame, selected_frame_level, 1);
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}
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static 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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/* find the pcb for the current process */
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if (cur_proc == NULL || 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 (read_pcb (core_kd, (CORE_ADDR)&uaddr->u_pcb) < 0)
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error ("cannot read pcb at %#x", &uaddr->u_pcb);
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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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kcore_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 ns;
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int nu;
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if (memaddr >= (CORE_ADDR)VM_MAXUSER_ADDRESS)
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nu = 0;
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else
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{
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nu = xfer_umem (memaddr, myaddr, len, write);
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if (nu <= 0)
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return (0);
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if (nu == len)
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return (nu);
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memaddr += nu;
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if (memaddr != (CORE_ADDR)VM_MAXUSER_ADDRESS)
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return (nu);
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myaddr += nu;
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len -= nu;
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}
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ns = (write ? kvm_write : kvm_read) (core_kd, memaddr, myaddr, len);
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if (ns < 0)
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ns = 0;
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return (nu + ns);
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}
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static int
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xfer_umem (memaddr, myaddr, len, write)
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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; /* ignored */
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{
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int n;
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struct proc proc;
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if (cur_proc == NULL || kvread (cur_proc, &proc))
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error ("cannot read proc at %#x", cur_proc);
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n = kvm_uread (core_kd, &proc, 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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#define KERNOFF ((unsigned)KERNBASE)
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#define INKERNEL(x) ((x) >= KERNOFF)
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static CORE_ADDR sbr;
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static CORE_ADDR curpcb;
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static int found_pcb;
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static int devmem;
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static int kfd;
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static struct pcb pcb;
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static void
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set_proc_cmd (arg, from_tty)
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char *arg;
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int from_tty;
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{
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CORE_ADDR paddr;
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struct kinfo_proc *kp;
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int cnt = 0;
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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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/* assume it's a proc pointer if it's in the kernel */
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if (paddr >= kernel_start) {
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if (set_proc_context(paddr))
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error("invalid proc address");
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} else {
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kp = kvm_getprocs(core_kd, KERN_PROC_PID, paddr, &cnt);
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if (!cnt)
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error("invalid pid");
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if (set_proc_context((CORE_ADDR)kp->ki_paddr))
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error("invalid proc address");
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}
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}
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static void
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set_cpu_cmd (arg, from_tty)
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char *arg;
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int from_tty;
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{
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CORE_ADDR paddr;
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CORE_ADDR pcaddr;
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struct kinfo_proc *kp;
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int cpu, cfd;
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if (!arg)
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error_no_arg ("cpu number");
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if (!kernel_debugging)
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error ("not debugging kernel");
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cfd = core_kd;
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cpu = (int)parse_and_eval_address (arg);
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if ((pcaddr = kvm_getpcpu (cfd, cpu)) == NULL)
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error ("cpu number out of range");
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pcpu = pcaddr;
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curpcb = kvtophys(cfd, pcpu + PCPU_OFFSET (curpcb));
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physrd (cfd, curpcb, (char*)&curpcb, sizeof curpcb);
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if (!devmem)
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paddr = ksym_lookup ("dumppcb") - KERNOFF;
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else
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paddr = kvtophys (cfd, curpcb);
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read_pcb (cfd, paddr);
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printf ("initial pcb at %lx\n", (unsigned long)paddr);
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if ((cur_proc = curProc()))
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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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print_stack_frame (selected_frame, selected_frame_level, 1);
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}
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/* substitutes for the stuff in libkvm which doesn't work */
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/* most of this was taken from the old kgdb */
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/* we don't need all this stuff, but the call should look the same */
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static int
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kvm_open (efile, cfile, sfile, perm, errout)
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const char *efile;
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char *cfile;
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char *sfile; /* makes this kvm_open more compatible to the one in libkvm */
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|
int perm;
|
|
char *errout; /* makes this kvm_open more compatible to the one in libkvm */
|
|
{
|
|
struct stat stb;
|
|
int cfd;
|
|
CORE_ADDR paddr;
|
|
|
|
if ((cfd = open (cfile, perm, 0)) < 0)
|
|
return (cfd);
|
|
|
|
if ((pcpu = kvm_getpcpu (cfd, 0)) == NULL)
|
|
return (-1);
|
|
|
|
fstat (cfd, &stb);
|
|
if ((stb.st_mode & S_IFMT) == S_IFCHR
|
|
&& stb.st_rdev == makedev (2, 0))
|
|
{
|
|
devmem = 1;
|
|
kfd = open (_PATH_KMEM, perm, 0);
|
|
}
|
|
|
|
physrd (cfd, ksym_lookup ("IdlePTD") - KERNOFF, (char*)&sbr, sizeof sbr);
|
|
printf ("IdlePTD %lu\n", (unsigned long)sbr);
|
|
curpcb = kvtophys(cfd, pcpu + PCPU_OFFSET (curpcb));
|
|
physrd (cfd, curpcb, (char*)&curpcb, sizeof curpcb);
|
|
|
|
found_pcb = 1; /* for vtophys */
|
|
if (!devmem)
|
|
paddr = ksym_lookup ("dumppcb") - KERNOFF;
|
|
else
|
|
paddr = kvtophys (cfd, curpcb);
|
|
read_pcb (cfd, paddr);
|
|
printf ("initial pcb at %lx\n", (unsigned long)paddr);
|
|
|
|
return (cfd);
|
|
}
|
|
|
|
static int
|
|
kvm_close (fd)
|
|
int fd;
|
|
{
|
|
return (close (fd));
|
|
}
|
|
|
|
static int
|
|
kvm_write (core_kd, memaddr, myaddr, len)
|
|
int core_kd;
|
|
CORE_ADDR memaddr;
|
|
char *myaddr;
|
|
{
|
|
int cc;
|
|
|
|
if (devmem)
|
|
{
|
|
if (kfd > 0)
|
|
{
|
|
/*
|
|
* Just like kvm_read, only we write.
|
|
*/
|
|
errno = 0;
|
|
if (lseek (kfd, (off_t)memaddr, 0) < 0
|
|
&& errno != 0)
|
|
{
|
|
error ("kvm_write:invalid address (%x)", memaddr);
|
|
return (0);
|
|
}
|
|
cc = write (kfd, myaddr, len);
|
|
if (cc < 0)
|
|
{
|
|
error ("kvm_write:write failed");
|
|
return (0);
|
|
}
|
|
else if (cc < len)
|
|
error ("kvm_write:short write");
|
|
return (cc);
|
|
}
|
|
else
|
|
return (0);
|
|
}
|
|
else
|
|
{
|
|
printf ("kvm_write not implemented for dead kernels\n");
|
|
return (0);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int
|
|
kvm_read (core_kd, memaddr, myaddr, len)
|
|
int core_kd;
|
|
CORE_ADDR memaddr;
|
|
char *myaddr;
|
|
{
|
|
return (kernel_core_file_hook (core_kd, memaddr, myaddr, len));
|
|
}
|
|
|
|
static int
|
|
kvm_uread (core_kd, p, memaddr, myaddr, len)
|
|
int core_kd;
|
|
register struct proc *p;
|
|
CORE_ADDR memaddr;
|
|
char *myaddr;
|
|
int len;
|
|
{
|
|
register char *cp;
|
|
char procfile[MAXPATHLEN];
|
|
ssize_t amount;
|
|
int fd;
|
|
|
|
if (devmem)
|
|
{
|
|
sprintf (procfile, "/proc/%d/mem", p->p_pid);
|
|
fd = open (procfile, O_RDONLY, 0);
|
|
if (fd < 0)
|
|
{
|
|
error ("cannot open %s", procfile);
|
|
close (fd);
|
|
return (0);
|
|
}
|
|
|
|
cp = myaddr;
|
|
while (len > 0)
|
|
{
|
|
errno = 0;
|
|
if (lseek (fd, (off_t)memaddr, 0) == -1 && errno != 0)
|
|
{
|
|
error ("invalid address (%x) in %s", memaddr, procfile);
|
|
break;
|
|
}
|
|
amount = read (fd, cp, len);
|
|
if (amount < 0)
|
|
{
|
|
error ("error reading %s", procfile);
|
|
break;
|
|
}
|
|
if (amount == 0)
|
|
{
|
|
error ("EOF reading %s", procfile);
|
|
break;
|
|
}
|
|
cp += amount;
|
|
memaddr += amount;
|
|
len -= amount;
|
|
}
|
|
|
|
close (fd);
|
|
return ((ssize_t) (cp - myaddr));
|
|
}
|
|
else
|
|
return (kernel_core_file_hook (core_kd, memaddr, myaddr, len));
|
|
}
|
|
|
|
static struct kinfo_proc kp;
|
|
|
|
/*
|
|
* try to do what kvm_proclist in libkvm would do
|
|
*/
|
|
static int
|
|
kvm_proclist (cfd, pid, p, cnt)
|
|
int cfd, pid, *cnt;
|
|
struct proc *p;
|
|
{
|
|
struct proc lp;
|
|
|
|
for (; p != NULL; p = LIST_NEXT(&lp, p_list)) {
|
|
if (!kvm_read(cfd, (CORE_ADDR)p, (char *)&lp, sizeof (lp)))
|
|
return (0);
|
|
if (lp.p_pid != pid)
|
|
continue;
|
|
kp.ki_paddr = p;
|
|
*cnt = 1;
|
|
return (1);
|
|
}
|
|
*cnt = 0;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* try to do what kvm_deadprocs in libkvm would do
|
|
*/
|
|
static struct kinfo_proc *
|
|
kvm_deadprocs (cfd, pid, cnt)
|
|
int cfd, pid, *cnt;
|
|
{
|
|
CORE_ADDR allproc, zombproc;
|
|
struct proc *p;
|
|
|
|
allproc = ksym_lookup("allproc");
|
|
if (kvm_read(cfd, allproc, (char *)&p, sizeof (p)) == 0)
|
|
return (NULL);
|
|
kvm_proclist (cfd, pid, p, cnt);
|
|
if (!*cnt) {
|
|
zombproc = ksym_lookup("zombproc");
|
|
if (kvm_read(cfd, zombproc, (char *)&p, sizeof (p)) == 0)
|
|
return (NULL);
|
|
kvm_proclist (cfd, pid, p, cnt);
|
|
}
|
|
return (&kp);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
kvm_getpcpu (cfd, cpuid)
|
|
int cfd, cpuid;
|
|
{
|
|
SLIST_HEAD(, globaldata) pcpu_head;
|
|
struct globaldata lgd;
|
|
struct globaldata *gd;
|
|
|
|
physrd (cfd, ksym_lookup ("cpuhead") - KERNOFF, (char*)&pcpu_head,
|
|
sizeof pcpu_head);
|
|
gd = SLIST_FIRST (&pcpu_head);
|
|
for (; gd != NULL; gd = SLIST_NEXT (&lgd, gd_allcpu))
|
|
{
|
|
kvm_read (cfd, (CORE_ADDR)gd, (char*)&lgd, sizeof lgd);
|
|
if (lgd.gd_cpuid == cpuid)
|
|
break;
|
|
}
|
|
|
|
return ((CORE_ADDR)gd);
|
|
}
|
|
|
|
/*
|
|
* try to do what kvm_getprocs in libkvm would do
|
|
*/
|
|
static struct kinfo_proc *
|
|
kvm_getprocs (cfd, op, proc, cnt)
|
|
int cfd, op, *cnt;
|
|
CORE_ADDR proc;
|
|
{
|
|
int mib[4], size;
|
|
|
|
*cnt = 0;
|
|
/* assume it's a pid */
|
|
if (devmem) { /* "live" kernel, use sysctl */
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_PROC;
|
|
mib[2] = KERN_PROC_PID;
|
|
mib[3] = (int)proc;
|
|
size = sizeof (kp);
|
|
if (sysctl (mib, 4, &kp, &size, NULL, 0) < 0) {
|
|
perror("sysctl");
|
|
*cnt = 0;
|
|
return (NULL);
|
|
}
|
|
if (!size)
|
|
*cnt = 0;
|
|
else
|
|
*cnt = 1;
|
|
return (&kp);
|
|
} else
|
|
return (kvm_deadprocs (cfd, (int)proc, cnt));
|
|
}
|
|
|
|
static int
|
|
physrd (cfd, addr, dat, len)
|
|
int cfd;
|
|
u_int addr;
|
|
char *dat;
|
|
int len;
|
|
{
|
|
if (lseek (cfd, (off_t)addr, L_SET) == -1)
|
|
return (-1);
|
|
return (read (cfd, dat, len));
|
|
}
|
|
|
|
static CORE_ADDR
|
|
kvtophys (fd, addr)
|
|
int fd;
|
|
CORE_ADDR addr;
|
|
{
|
|
CORE_ADDR v;
|
|
unsigned int pte;
|
|
static CORE_ADDR PTD = -1;
|
|
CORE_ADDR current_ptd;
|
|
|
|
/*
|
|
* We may no longer have a linear system page table...
|
|
*
|
|
* Here's the scoop. IdlePTD contains the physical address
|
|
* of a page table directory that always maps the kernel.
|
|
* IdlePTD is in memory that is mapped 1-to-1, so we can
|
|
* find it easily given its 'virtual' address from ksym_lookup().
|
|
* For hysterical reasons, the value of IdlePTD is stored in sbr.
|
|
*
|
|
* To look up a kernel address, we first convert it to a 1st-level
|
|
* address and look it up in IdlePTD. This gives us the physical
|
|
* address of a page table page; we extract the 2nd-level part of
|
|
* VA and read the 2nd-level pte. Finally, we add the offset part
|
|
* of the VA into the physical address from the pte and return it.
|
|
*
|
|
* User addresses are a little more complicated. If we don't have
|
|
* a current PCB from read_pcb(), we use PTD, which is the (fixed)
|
|
* virtual address of the current ptd. Since it's NOT in 1-to-1
|
|
* kernel space, we must look it up using IdlePTD. If we do have
|
|
* a pcb, we get the ptd from pcb_ptd.
|
|
*/
|
|
|
|
if (INKERNEL (addr))
|
|
current_ptd = sbr;
|
|
else if (found_pcb == 0)
|
|
{
|
|
if (PTD == -1)
|
|
PTD = kvtophys (fd, ksym_lookup ("PTD"));
|
|
current_ptd = PTD;
|
|
}
|
|
else
|
|
current_ptd = pcb.pcb_cr3;
|
|
|
|
/*
|
|
* Read the first-level page table (ptd).
|
|
*/
|
|
v = current_ptd + ( (unsigned)addr >> PDRSHIFT) * sizeof pte;
|
|
if (physrd (fd, v, (char *)&pte, sizeof pte) < 0 || (pte&PG_V) == 0)
|
|
return (~0);
|
|
|
|
if (pte & PG_PS)
|
|
{
|
|
/*
|
|
* No second-level page table; ptd describes one 4MB page.
|
|
* (We assume that the kernel wouldn't set PG_PS without enabling
|
|
* it cr0, and that the kernel doesn't support 36-bit physical
|
|
* addresses).
|
|
*/
|
|
#define PAGE4M_MASK (NBPDR - 1)
|
|
#define PG_FRAME4M (~PAGE4M_MASK)
|
|
addr = (pte & PG_FRAME4M) + (addr & PAGE4M_MASK);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Read the second-level page table.
|
|
*/
|
|
v = (pte&PG_FRAME) + ((addr >> PAGE_SHIFT)&(NPTEPG-1)) * sizeof pte;
|
|
if (physrd (fd, v, (char *) &pte, sizeof (pte)) < 0 || (pte&PG_V) == 0)
|
|
return (~0);
|
|
|
|
addr = (pte & PG_FRAME) + (addr & PAGE_MASK);
|
|
}
|
|
#if 0
|
|
printf ("vtophys (%x) -> %x\n", oldaddr, addr);
|
|
#endif
|
|
return (addr);
|
|
}
|
|
|
|
static int
|
|
read_pcb (fd, uaddr)
|
|
int fd;
|
|
CORE_ADDR uaddr;
|
|
{
|
|
int i;
|
|
int noreg;
|
|
CORE_ADDR nuaddr = uaddr;
|
|
|
|
/* need this for the `proc' command to work */
|
|
if (INKERNEL(uaddr))
|
|
nuaddr = kvtophys(fd, uaddr);
|
|
|
|
if (physrd (fd, nuaddr, (char *)&pcb, sizeof pcb) < 0)
|
|
{
|
|
error ("cannot read pcb at %x\n", uaddr);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* get the register values out of the sys pcb and
|
|
* store them where `read_register' will find them.
|
|
*/
|
|
/*
|
|
* XXX many registers aren't available.
|
|
* XXX for the non-core case, the registers are stale - they are for
|
|
* the last context switch to the debugger.
|
|
* XXX gcc's register numbers aren't all #defined in tm-i386.h.
|
|
*/
|
|
noreg = 0;
|
|
for (i = 0; i < 3; ++i) /* eax,ecx,edx */
|
|
supply_register (i, (char *)&noreg);
|
|
supply_register (3, (char *)&pcb.pcb_ebx);
|
|
supply_register (SP_REGNUM, (char *)&pcb.pcb_esp);
|
|
supply_register (FP_REGNUM, (char *)&pcb.pcb_ebp);
|
|
supply_register (6, (char *)&pcb.pcb_esi);
|
|
supply_register (7, (char *)&pcb.pcb_edi);
|
|
supply_register (PC_REGNUM, (char *)&pcb.pcb_eip);
|
|
for (i = 9; i < 14; ++i) /* eflags, cs, ss, ds, es, fs */
|
|
supply_register (i, (char *)&noreg);
|
|
supply_register (15, (char *)&pcb.pcb_gs);
|
|
|
|
/* XXX 80387 registers? */
|
|
}
|
|
|
|
/*
|
|
* read len bytes from kernel virtual address 'addr' into local
|
|
* buffer 'buf'. Return numbert of bytes if read ok, 0 otherwise. On read
|
|
* errors, portion of buffer not read is zeroed.
|
|
*/
|
|
|
|
static int
|
|
kernel_core_file_hook (fd, addr, buf, len)
|
|
int fd;
|
|
CORE_ADDR addr;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
int i;
|
|
CORE_ADDR paddr;
|
|
register char *cp;
|
|
int cc;
|
|
|
|
cp = buf;
|
|
|
|
while (len > 0)
|
|
{
|
|
paddr = kvtophys (fd, addr);
|
|
if (paddr == ~0)
|
|
{
|
|
memset (buf, '\000', len);
|
|
break;
|
|
}
|
|
/* we can't read across a page boundary */
|
|
i = min (len, PAGE_SIZE - (addr & PAGE_MASK));
|
|
if ( (cc = physrd (fd, paddr, cp, i)) <= 0)
|
|
{
|
|
memset (cp, '\000', len);
|
|
return (cp - buf);
|
|
}
|
|
cp += cc;
|
|
addr += cc;
|
|
len -= cc;
|
|
}
|
|
return (cp - buf);
|
|
}
|
|
|
|
static struct target_ops kcore_ops;
|
|
|
|
void
|
|
_initialize_kcorelow()
|
|
{
|
|
kcore_ops.to_shortname = "kcore";
|
|
kcore_ops.to_longname = "Kernel core dump file";
|
|
kcore_ops.to_doc =
|
|
"Use a core file as a target. Specify the filename of the core file.";
|
|
kcore_ops.to_open = kcore_open;
|
|
kcore_ops.to_close = kcore_close;
|
|
kcore_ops.to_attach = find_default_attach;
|
|
kcore_ops.to_detach = kcore_detach;
|
|
kcore_ops.to_fetch_registers = get_kcore_registers;
|
|
kcore_ops.to_xfer_memory = kcore_xfer_kmem;
|
|
kcore_ops.to_files_info = kcore_files_info;
|
|
kcore_ops.to_create_inferior = find_default_create_inferior;
|
|
kcore_ops.to_stratum = kcore_stratum;
|
|
kcore_ops.to_has_memory = 1;
|
|
kcore_ops.to_has_stack = 1;
|
|
kcore_ops.to_has_registers = 1;
|
|
kcore_ops.to_magic = OPS_MAGIC;
|
|
|
|
add_target (&kcore_ops);
|
|
add_com ("proc", class_obscure, set_proc_cmd, "Set current process context");
|
|
add_com ("cpu", class_obscure, set_cpu_cmd, "Set current cpu");
|
|
}
|