--- /dev/null
+/* 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");
+}
+\f
+
+/* 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);
+}
#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. */
perror_with_name ("ptrace");
}
\f
+
+/* 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;
+}
+\f
+
+/* Prevent warning from -Wmissing-prototypes. */
+void _initialize_i386fbsd_nat (void);
+
void
_initialize_i386fbsd_nat (void)
{
}
}
#endif
+
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (i386fbsd_supply_pcb);
}
projects / binutils-gdb.git / commitdiff