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* i386fbsd-nat.c: Include <sys/types.h>, <machine/pcb.h> and "bsd-kvm.h". (i386fbsd_supply_pcb): New function. * Makefile.in (ALLDEPFILES): Add bsd-kvm.c. (i386fbsd-nat.o): Update dependencies. (bsd_kvm_h): New variable. (bsd-kvm.o): New dependency. * config/i386/fbsd.mh (NATDEPFILES): Add bsd-kvm.o. (LOADLIBES): New variable.jimb-rda-nptl-branch
Mark Kettenis
23 years ago
6 changed files with 324 additions and 5 deletions
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/* BSD Kernel Data Access Library (libkvm) interface.
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Copyright 2004 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, |
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Boston, MA 02111-1307, USA. */ |
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#include "defs.h" |
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#include "frame.h" |
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#include "regcache.h" |
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#include "target.h" |
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#include "gdb_assert.h" |
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#include <fcntl.h> |
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#include <kvm.h> |
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#include <nlist.h> |
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#include "readline/readline.h" |
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#include <sys/param.h> |
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#include <sys/user.h> |
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#include "bsd-kvm.h" |
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/* Kernel memory interface descriptor. */ |
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kvm_t *core_kd; |
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/* Address of process control block. */ |
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struct pcb *bsd_kvm_paddr; |
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/* Pointer to architecture-specific function that reconstructs the
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register state from PCB and supplies it to REGCACHE. */ |
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int (*bsd_kvm_supply_pcb)(struct regcache *regcache, struct pcb *pcb); |
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/* Target ops for libkvm interface. */ |
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struct target_ops bsd_kvm_ops; |
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static void |
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bsd_kvm_open (char *filename, int from_tty) |
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{ |
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char errbuf[_POSIX2_LINE_MAX]; |
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char *execfile = NULL; |
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kvm_t *temp_kd; |
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target_preopen (from_tty); |
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if (filename) |
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{ |
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char *temp; |
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filename = tilde_expand (filename); |
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if (filename[0] != '/') |
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{ |
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temp = concat (current_directory, "/", filename, NULL); |
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xfree (filename); |
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filename = temp; |
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} |
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} |
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temp_kd = kvm_openfiles (execfile, filename, NULL, O_RDONLY, errbuf); |
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if (temp_kd == NULL) |
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error ("%s", errbuf); |
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unpush_target (&bsd_kvm_ops); |
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core_kd = temp_kd; |
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push_target (&bsd_kvm_ops); |
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target_fetch_registers (-1); |
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flush_cached_frames (); |
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select_frame (get_current_frame ()); |
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print_stack_frame (get_selected_frame (), -1, 1); |
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} |
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static void |
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bsd_kvm_close (int quitting) |
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{ |
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if (core_kd) |
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{ |
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if (kvm_close (core_kd) == -1) |
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warning ("%s", kvm_geterr(core_kd)); |
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core_kd = NULL; |
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} |
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} |
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static int |
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bsd_kvm_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, |
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int write, struct mem_attrib *attrib, |
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struct target_ops *ops) |
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{ |
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if (write) |
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return kvm_write (core_kd, memaddr, myaddr, len); |
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else |
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return kvm_read (core_kd, memaddr, myaddr, len); |
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return -1; |
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} |
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/* Fetch process control block at address PADDR. */ |
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static int |
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bsd_kvm_fetch_pcb (struct pcb *paddr) |
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{ |
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struct pcb pcb; |
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if (kvm_read (core_kd, (unsigned long) paddr, &pcb, sizeof pcb) == -1) |
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error ("%s", kvm_geterr (core_kd)); |
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gdb_assert (bsd_kvm_supply_pcb); |
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return bsd_kvm_supply_pcb (current_regcache, &pcb); |
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} |
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static void |
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bsd_kvm_fetch_registers (int regnum) |
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{ |
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struct nlist nl[2]; |
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if (bsd_kvm_paddr) |
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bsd_kvm_fetch_pcb (bsd_kvm_paddr); |
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/* On dumping core, BSD kernels store the faulting context (PCB)
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in the variable "dumppcb". */ |
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memset (nl, 0, sizeof nl); |
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nl[0].n_name = "_dumppcb"; |
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if (kvm_nlist (core_kd, nl) == -1) |
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error ("%s", kvm_geterr (core_kd)); |
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if (nl[0].n_value != 0) |
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{ |
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/* Found dumppcb. If it contains a valid context, return
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immediately. */ |
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if (bsd_kvm_fetch_pcb ((struct pcb *) nl[0].n_value)) |
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return; |
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} |
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/* Traditional BSD kernels have a process proc0 that should always
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be present. The address of proc0's PCB is stored in the variable |
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"proc0paddr". */ |
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memset (nl, 0, sizeof nl); |
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nl[0].n_name = "_proc0paddr"; |
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if (kvm_nlist (core_kd, nl) == -1) |
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error ("%s", kvm_geterr (core_kd)); |
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if (nl[0].n_value != 0) |
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{ |
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struct pcb *paddr; |
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/* Found proc0paddr. */ |
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if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1) |
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error ("%s", kvm_geterr (core_kd)); |
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bsd_kvm_fetch_pcb (paddr); |
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return; |
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} |
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#ifdef HAVE_STRUCT_THREAD_TD_PCB |
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/* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
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lives in `struct proc' but in `struct thread'. The `struct |
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thread' for the initial thread for proc0 can be found in the |
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variable "thread0". */ |
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memset (nl, 0, sizeof nl); |
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nl[0].n_name = "_thread0"; |
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if (kvm_nlist (core_kd, nl) == -1) |
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error ("%s", kvm_geterr (core_kd)); |
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if (nl[0].n_value != 0) |
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{ |
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struct pcb *paddr; |
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/* Found thread0. */ |
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nl[1].n_value += offsetof (struct thread, td_pcb); |
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if (kvm_read (core_kd, nl[1].n_value, &paddr, sizeof paddr) == -1) |
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error ("%s", kvm_geterr (core_kd)); |
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bsd_kvm_fetch_pcb (paddr); |
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return; |
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} |
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#endif |
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error ("Cannot find a valid PCB"); |
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} |
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/* Add the libkvm interface to the list of all possible targets and
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register CUPPLY_PCB as the architecture-specific process control |
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block interpreter. */ |
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void |
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bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *)) |
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{ |
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gdb_assert (bsd_kvm_supply_pcb == NULL); |
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bsd_kvm_supply_pcb = supply_pcb; |
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bsd_kvm_ops.to_shortname = "kvm"; |
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bsd_kvm_ops.to_longname = "Kernel memory interface"; |
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bsd_kvm_ops.to_doc = "Use a kernel virtual memory image as a target.\n\
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Optionally specify the filename of a core dump."; |
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bsd_kvm_ops.to_open = bsd_kvm_open; |
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bsd_kvm_ops.to_close = bsd_kvm_close; |
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bsd_kvm_ops.to_fetch_registers = bsd_kvm_fetch_registers; |
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bsd_kvm_ops.to_xfer_memory = bsd_kvm_xfer_memory; |
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bsd_kvm_ops.to_stratum = process_stratum; |
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bsd_kvm_ops.to_has_memory = 1; |
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bsd_kvm_ops.to_has_stack = 1; |
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bsd_kvm_ops.to_has_registers = 1; |
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bsd_kvm_ops.to_magic = OPS_MAGIC; |
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add_target (&bsd_kvm_ops); |
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} |
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@ -0,0 +1,35 @@ |
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/* BSD Kernel Data Access Library (libkvm) interface.
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Copyright 2004 Free Software Foundation, Inc. |
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|
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This file is part of GDB. |
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|
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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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|
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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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|
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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, |
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Boston, MA 02111-1307, USA. */ |
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#ifndef BSD_KVM_H |
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#define BSD_KVM_H |
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struct pcb; |
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struct regcache; |
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/* Add the libkvm interface to the list of all possible targets and
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register CUPPLY_PCB as the architecture-specific process control |
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block interpreter. */ |
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extern void |
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bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *)); |
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#endif /* bsd-kvm.h */ |
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@ -1,5 +1,8 @@ |
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# Host: FreeBSD/i386 |
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NATDEPFILES= fork-child.o infptrace.o inftarg.o \ |
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i386-nat.o i386bsd-nat.o i386fbsd-nat.o gcore.o fbsd-proc.o |
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i386-nat.o i386bsd-nat.o i386fbsd-nat.o \ |
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gcore.o fbsd-proc.o bsd-kvm.o |
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NAT_FILE= nm-fbsd.h |
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XM_FILE= xm-i386.h |
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LOADLIBES= -lkvm |
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