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* bsd-kvm.c, bsd-kvm.h: New files.

Browse Source 
* 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.
This commit is contained in:
Mark Kettenis 2004-05-22 17:21:36 +00:00
parent 9ea75c57ce
commit 2e0c35398d
6 changed files with 324 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
gdb/ChangeLog
View File

@ -1,5 +1,16 @@
2004-05-22 Mark Kettenis <kettenis@gnu.org>
* bsd-kvm.c, bsd-kvm.h: New files.
* 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.
* regset.c: Tweak comment.
(regset_alloc): Remove descr argument. Use GDBARCH_OBSTACK_ZALLOC
macro.

6
gdb/Makefile.in
View File

@ -631,6 +631,7 @@ bcache_h = bcache.h
bfd_target_h = bfd-target.h
block_h = block.h
breakpoint_h = breakpoint.h $(frame_h) $(value_h) $(gdb_events_h)
bsd_kvm_h = bsd-kvm.h
buildsym_h = buildsym.h
call_cmds_h = call-cmds.h
charset_h = charset.h
@ -1322,6 +1323,7 @@ ALLDEPFILES = \
arm-linux-nat.c arm-linux-tdep.c arm-tdep.c \
armnbsd-nat.c armnbsd-tdep.c \
avr-tdep.c \
bsd-kvm.c \
coff-solib.c \
core-regset.c core-aout.c corelow.c \
dcache.c dpx2-nat.c exec.c fork-child.c \
@ -1613,6 +1615,8 @@ breakpoint.o: breakpoint.c $(defs_h) $(symtab_h) $(frame_h) $(breakpoint_h) \
$(objfiles_h) $(source_h) $(linespec_h) $(completer_h) $(gdb_h) \
$(ui_out_h) $(cli_script_h) $(gdb_assert_h) $(block_h) \
$(gdb_events_h)
bsd-kvm.o: bsd-kvm.c $(defs_h) $(frame_h) $(regcache_h) $(target_h) \
$(gdb_assert_h) $(readline_h) $(bsd_kvm_h)
buildsym.o: buildsym.c $(defs_h) $(bfd_h) $(gdb_obstack_h) $(symtab_h) \
$(symfile_h) $(objfiles_h) $(gdbtypes_h) $(gdb_assert_h) \
$(complaints_h) $(gdb_string_h) $(expression_h) $(language_h) \
@ -1854,7 +1858,7 @@ i386bsd-tdep.o: i386bsd-tdep.c $(defs_h) $(arch_utils_h) $(frame_h) \
i386-cygwin-tdep.o: i386-cygwin-tdep.c $(defs_h) $(osabi_h) $(gdb_string_h) \
$(i386_tdep_h)
i386fbsd-nat.o: i386fbsd-nat.c $(defs_h) $(inferior_h) $(regcache_h) \
$(i386_tdep_h)
$(i386_tdep_h) $(bsd_kvm_h)
i386fbsd-tdep.o: i386fbsd-tdep.c $(defs_h) $(arch_utils_h) $(osabi_h) \
$(i386_tdep_h) $(i387_tdep_h) $(solib_svr4_h)
i386gnu-nat.o: i386gnu-nat.c $(defs_h) $(inferior_h) $(floatformat_h) \

226
gdb/bsd-kvm.c Normal file
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@ -0,0 +1,226 @@
/* BSD Kernel Data Access Library (libkvm) interface.
Copyright 2004 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#include "regcache.h"
#include "target.h"
#include "gdb_assert.h"
#include <fcntl.h>
#include <kvm.h>
#include <nlist.h>
#include "readline/readline.h"
#include <sys/param.h>
#include <sys/user.h>
#include "bsd-kvm.h"
/* Kernel memory interface descriptor. */
kvm_t *core_kd;
/* Address of process control block. */
struct pcb *bsd_kvm_paddr;
/* Pointer to architecture-specific function that reconstructs the
register state from PCB and supplies it to REGCACHE. */
int (*bsd_kvm_supply_pcb)(struct regcache *regcache, struct pcb *pcb);
/* Target ops for libkvm interface. */
struct target_ops bsd_kvm_ops;
static void
bsd_kvm_open (char *filename, int from_tty)
{
char errbuf[_POSIX2_LINE_MAX];
char *execfile = NULL;
kvm_t *temp_kd;
target_preopen (from_tty);
if (filename)
{
char *temp;
filename = tilde_expand (filename);
if (filename[0] != '/')
{
temp = concat (current_directory, "/", filename, NULL);
xfree (filename);
filename = temp;
}
}
temp_kd = kvm_openfiles (execfile, filename, NULL, O_RDONLY, errbuf);
if (temp_kd == NULL)
error ("%s", errbuf);
unpush_target (&bsd_kvm_ops);
core_kd = temp_kd;
push_target (&bsd_kvm_ops);
target_fetch_registers (-1);
flush_cached_frames ();
select_frame (get_current_frame ());
print_stack_frame (get_selected_frame (), -1, 1);
}
static void
bsd_kvm_close (int quitting)
{
if (core_kd)
{
if (kvm_close (core_kd) == -1)
warning ("%s", kvm_geterr(core_kd));
core_kd = NULL;
}
}
static int
bsd_kvm_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
int write, struct mem_attrib *attrib,
struct target_ops *ops)
{
if (write)
return kvm_write (core_kd, memaddr, myaddr, len);
else
return kvm_read (core_kd, memaddr, myaddr, len);
return -1;
}
/* Fetch process control block at address PADDR. */
static int
bsd_kvm_fetch_pcb (struct pcb *paddr)
{
struct pcb pcb;
if (kvm_read (core_kd, (unsigned long) paddr, &pcb, sizeof pcb) == -1)
error ("%s", kvm_geterr (core_kd));
gdb_assert (bsd_kvm_supply_pcb);
return bsd_kvm_supply_pcb (current_regcache, &pcb);
}
static void
bsd_kvm_fetch_registers (int regnum)
{
struct nlist nl[2];
if (bsd_kvm_paddr)
bsd_kvm_fetch_pcb (bsd_kvm_paddr);
/* On dumping core, BSD kernels store the faulting context (PCB)
in the variable "dumppcb". */
memset (nl, 0, sizeof nl);
nl[0].n_name = "_dumppcb";
if (kvm_nlist (core_kd, nl) == -1)
error ("%s", kvm_geterr (core_kd));
if (nl[0].n_value != 0)
{
/* Found dumppcb. If it contains a valid context, return
immediately. */
if (bsd_kvm_fetch_pcb ((struct pcb *) nl[0].n_value))
return;
}
/* Traditional BSD kernels have a process proc0 that should always
be present. The address of proc0's PCB is stored in the variable
"proc0paddr". */
memset (nl, 0, sizeof nl);
nl[0].n_name = "_proc0paddr";
if (kvm_nlist (core_kd, nl) == -1)
error ("%s", kvm_geterr (core_kd));
if (nl[0].n_value != 0)
{
struct pcb *paddr;
/* Found proc0paddr. */
if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1)
error ("%s", kvm_geterr (core_kd));
bsd_kvm_fetch_pcb (paddr);
return;
}
#ifdef HAVE_STRUCT_THREAD_TD_PCB
/* In FreeBSD kernels for 5.0-RELEASE and later, the PCB no longer
lives in `struct proc' but in `struct thread'. The `struct
thread' for the initial thread for proc0 can be found in the
variable "thread0". */
memset (nl, 0, sizeof nl);
nl[0].n_name = "_thread0";
if (kvm_nlist (core_kd, nl) == -1)
error ("%s", kvm_geterr (core_kd));
if (nl[0].n_value != 0)
{
struct pcb *paddr;
/* Found thread0. */
nl[1].n_value += offsetof (struct thread, td_pcb);
if (kvm_read (core_kd, nl[1].n_value, &paddr, sizeof paddr) == -1)
error ("%s", kvm_geterr (core_kd));
bsd_kvm_fetch_pcb (paddr);
return;
}
#endif
error ("Cannot find a valid PCB");
}
/* Add the libkvm interface to the list of all possible targets and
register CUPPLY_PCB as the architecture-specific process control
block interpreter. */
void
bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *))
{
gdb_assert (bsd_kvm_supply_pcb == NULL);
bsd_kvm_supply_pcb = supply_pcb;
bsd_kvm_ops.to_shortname = "kvm";
bsd_kvm_ops.to_longname = "Kernel memory interface";
bsd_kvm_ops.to_doc = "Use a kernel virtual memory image as a target.\n\
Optionally specify the filename of a core dump.";
bsd_kvm_ops.to_open = bsd_kvm_open;
bsd_kvm_ops.to_close = bsd_kvm_close;
bsd_kvm_ops.to_fetch_registers = bsd_kvm_fetch_registers;
bsd_kvm_ops.to_xfer_memory = bsd_kvm_xfer_memory;
bsd_kvm_ops.to_stratum = process_stratum;
bsd_kvm_ops.to_has_memory = 1;
bsd_kvm_ops.to_has_stack = 1;
bsd_kvm_ops.to_has_registers = 1;
bsd_kvm_ops.to_magic = OPS_MAGIC;
add_target (&bsd_kvm_ops);
}

35
gdb/bsd-kvm.h Normal file
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@ -0,0 +1,35 @@
/* BSD Kernel Data Access Library (libkvm) interface.
Copyright 2004 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef BSD_KVM_H
#define BSD_KVM_H
struct pcb;
struct regcache;
/* Add the libkvm interface to the list of all possible targets and
register CUPPLY_PCB as the architecture-specific process control
block interpreter. */
extern void
bsd_kvm_add_target (int (*supply_pcb)(struct regcache *, struct pcb *));
#endif /* bsd-kvm.h */

5
gdb/config/i386/fbsd.mh
View File

@ -1,5 +1,8 @@
# Host: FreeBSD/i386
NATDEPFILES= fork-child.o infptrace.o inftarg.o \
i386-nat.o i386bsd-nat.o i386fbsd-nat.o gcore.o fbsd-proc.o
i386-nat.o i386bsd-nat.o i386fbsd-nat.o \
gcore.o fbsd-proc.o bsd-kvm.o
NAT_FILE= nm-fbsd.h
XM_FILE= xm-i386.h
LOADLIBES= -lkvm

46
gdb/i386fbsd-nat.c
View File

@ -29,9 +29,6 @@
#include "i386-tdep.h"
/* Prevent warning from -Wmissing-prototypes. */
void _initialize_i386fbsd_nat (void);
/* Resume execution of the inferior process.
If STEP is nonzero, single-step it.
If SIGNAL is nonzero, give it that signal. */
@ -79,6 +76,46 @@ child_resume (ptid_t ptid, int step, enum target_signal signal)
perror_with_name ("ptrace");
}
/* Support for debugging kernel virtual memory images. */
#include <sys/types.h>
#include <machine/pcb.h>
#include "bsd-kvm.h"
static int
i386fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
/* The following is true for FreeBSD 4.7:
The pcb contains %eip, %ebx, %esp, %ebp, %esi, %edi and %gs.
This accounts for all callee-saved registers specified by the
psABI and then some. Here %esp contains the stack pointer at the
point just after the call to cpu_switch(). From this information
we reconstruct the register state as it would look when we just
returned from cpu_switch(). */
/* The stack pointer shouldn't be zero. */
if (pcb->pcb_esp == 0)
return 0;
pcb->pcb_esp += 4;
regcache_raw_supply (regcache, I386_EDI_REGNUM, &pcb->pcb_edi);
regcache_raw_supply (regcache, I386_ESI_REGNUM, &pcb->pcb_esi);
regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
regcache_raw_supply (regcache, I386_EBX_REGNUM, &pcb->pcb_ebx);
regcache_raw_supply (regcache, I386_EIP_REGNUM, &pcb->pcb_eip);
regcache_raw_supply (regcache, I386_GS_REGNUM, &pcb->pcb_gs);
return 1;
}
/* Prevent warning from -Wmissing-prototypes. */
void _initialize_i386fbsd_nat (void);
void
_initialize_i386fbsd_nat (void)
{
@ -104,4 +141,7 @@ _initialize_i386fbsd_nat (void)
}
}
#endif
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (i386fbsd_supply_pcb);
}