gdb/bsd-kvm.c - gdb
Global variables defined
Functions defined
Source code
- #include "defs.h"
- #include "cli/cli-cmds.h"
- #include "command.h"
- #include "frame.h"
- #include "regcache.h"
- #include "target.h"
- #include "value.h"
- #include "gdbcore.h"
- #include "gdbthread.h"
- #include <fcntl.h>
- #include <kvm.h>
- #ifdef HAVE_NLIST_H
- #include <nlist.h>
- #endif
- #include <paths.h>
- #include "readline/readline.h"
- #include <sys/param.h>
- #include <sys/proc.h>
- #include <sys/user.h>
- #include "bsd-kvm.h"
- static const char *bsd_kvm_corefile;
- static kvm_t *core_kd;
- static struct pcb *bsd_kvm_paddr;
- static int (*bsd_kvm_supply_pcb)(struct regcache *regcache, struct pcb *pcb);
- static struct target_ops bsd_kvm_ops;
- static ptid_t bsd_kvm_ptid;
- static void
- bsd_kvm_open (const char *arg, int from_tty)
- {
- char errbuf[_POSIX2_LINE_MAX];
- char *execfile = NULL;
- kvm_t *temp_kd;
- char *filename = NULL;
- target_preopen (from_tty);
- if (arg)
- {
- char *temp;
- filename = tilde_expand (arg);
- if (filename[0] != '/')
- {
- temp = concat (current_directory, "/", filename, (char *)NULL);
- xfree (filename);
- filename = temp;
- }
- }
- execfile = get_exec_file (0);
- temp_kd = kvm_openfiles (execfile, filename, NULL,
- write_files ? O_RDWR : O_RDONLY, errbuf);
- if (temp_kd == NULL)
- error (("%s"), errbuf);
- bsd_kvm_corefile = filename;
- unpush_target (&bsd_kvm_ops);
- core_kd = temp_kd;
- push_target (&bsd_kvm_ops);
- add_thread_silent (bsd_kvm_ptid);
- inferior_ptid = bsd_kvm_ptid;
- target_fetch_registers (get_current_regcache (), -1);
- reinit_frame_cache ();
- print_stack_frame (get_selected_frame (NULL), 0, SRC_AND_LOC, 1);
- }
- static void
- bsd_kvm_close (struct target_ops *self)
- {
- if (core_kd)
- {
- if (kvm_close (core_kd) == -1)
- warning (("%s"), kvm_geterr(core_kd));
- core_kd = NULL;
- }
- inferior_ptid = null_ptid;
- delete_thread_silent (bsd_kvm_ptid);
- }
- static LONGEST
- bsd_kvm_xfer_memory (CORE_ADDR addr, ULONGEST len,
- gdb_byte *readbuf, const gdb_byte *writebuf)
- {
- ssize_t nbytes = len;
- if (readbuf)
- nbytes = kvm_read (core_kd, addr, readbuf, nbytes);
- if (writebuf && nbytes > 0)
- nbytes = kvm_write (core_kd, addr, writebuf, nbytes);
- return nbytes;
- }
- static enum target_xfer_status
- bsd_kvm_xfer_partial (struct target_ops *ops, enum target_object object,
- const char *annex, gdb_byte *readbuf,
- const gdb_byte *writebuf,
- ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
- {
- switch (object)
- {
- case TARGET_OBJECT_MEMORY:
- {
- LONGEST ret = bsd_kvm_xfer_memory (offset, len, readbuf, writebuf);
- if (ret < 0)
- return TARGET_XFER_E_IO;
- else if (ret == 0)
- return TARGET_XFER_EOF;
- else
- {
- *xfered_len = (ULONGEST) ret;
- return TARGET_XFER_OK;
- }
- }
- default:
- return TARGET_XFER_E_IO;
- }
- }
- static void
- bsd_kvm_files_info (struct target_ops *ops)
- {
- if (bsd_kvm_corefile && strcmp (bsd_kvm_corefile, _PATH_MEM) != 0)
- printf_filtered (_("\tUsing the kernel crash dump %s.\n"),
- bsd_kvm_corefile);
- else
- printf_filtered (_("\tUsing the currently running kernel.\n"));
- }
- static int
- bsd_kvm_fetch_pcb (struct regcache *regcache, 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 (regcache, &pcb);
- }
- static void
- bsd_kvm_fetch_registers (struct target_ops *ops,
- struct regcache *regcache, int regnum)
- {
- struct nlist nl[2];
- if (bsd_kvm_paddr)
- {
- bsd_kvm_fetch_pcb (regcache, bsd_kvm_paddr);
- return;
- }
-
- 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)
- {
-
- if (bsd_kvm_fetch_pcb (regcache, (struct pcb *) nl[0].n_value))
- return;
- }
-
- 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;
-
- if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1)
- error (("%s"), kvm_geterr (core_kd));
- bsd_kvm_fetch_pcb (regcache, paddr);
- return;
- }
- #ifdef HAVE_STRUCT_THREAD_TD_PCB
-
- 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;
-
- nl[0].n_value += offsetof (struct thread, td_pcb);
- if (kvm_read (core_kd, nl[0].n_value, &paddr, sizeof paddr) == -1)
- error (("%s"), kvm_geterr (core_kd));
- bsd_kvm_fetch_pcb (regcache, paddr);
- return;
- }
- #endif
-
- error (_("Cannot find a valid PCB"));
- }
- struct cmd_list_element *bsd_kvm_cmdlist;
- static void
- bsd_kvm_cmd (char *arg, int fromtty)
- {
-
- }
- #ifndef HAVE_STRUCT_THREAD_TD_PCB
- static void
- bsd_kvm_proc_cmd (char *arg, int fromtty)
- {
- CORE_ADDR addr;
- if (arg == NULL)
- error_no_arg (_("proc address"));
- if (core_kd == NULL)
- error (_("No kernel memory image."));
- addr = parse_and_eval_address (arg);
- #ifdef HAVE_STRUCT_LWP
- addr += offsetof (struct lwp, l_addr);
- #else
- addr += offsetof (struct proc, p_addr);
- #endif
- if (kvm_read (core_kd, addr, &bsd_kvm_paddr, sizeof bsd_kvm_paddr) == -1)
- error (("%s"), kvm_geterr (core_kd));
- target_fetch_registers (get_current_regcache (), -1);
- reinit_frame_cache ();
- print_stack_frame (get_selected_frame (NULL), 0, SRC_AND_LOC, 1);
- }
- #endif
- static void
- bsd_kvm_pcb_cmd (char *arg, int fromtty)
- {
- if (arg == NULL)
-
- error_no_arg (_("pcb address"));
- if (core_kd == NULL)
- error (_("No kernel memory image."));
- bsd_kvm_paddr = (struct pcb *)(u_long) parse_and_eval_address (arg);
- target_fetch_registers (get_current_regcache (), -1);
- reinit_frame_cache ();
- print_stack_frame (get_selected_frame (NULL), 0, SRC_AND_LOC, 1);
- }
- static int
- bsd_kvm_thread_alive (struct target_ops *ops,
- ptid_t ptid)
- {
- return 1;
- }
- static char *
- bsd_kvm_pid_to_str (struct target_ops *ops, ptid_t ptid)
- {
- static char buf[64];
- xsnprintf (buf, sizeof buf, "<kvm>");
- return buf;
- }
- static int
- bsd_kvm_return_one (struct target_ops *ops)
- {
- return 1;
- }
- 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_partial = bsd_kvm_xfer_partial;
- bsd_kvm_ops.to_files_info = bsd_kvm_files_info;
- bsd_kvm_ops.to_thread_alive = bsd_kvm_thread_alive;
- bsd_kvm_ops.to_pid_to_str = bsd_kvm_pid_to_str;
- bsd_kvm_ops.to_stratum = process_stratum;
- bsd_kvm_ops.to_has_memory = bsd_kvm_return_one;
- bsd_kvm_ops.to_has_stack = bsd_kvm_return_one;
- bsd_kvm_ops.to_has_registers = bsd_kvm_return_one;
- bsd_kvm_ops.to_magic = OPS_MAGIC;
- add_target (&bsd_kvm_ops);
- add_prefix_cmd ("kvm", class_obscure, bsd_kvm_cmd, _("\
- Generic command for manipulating the kernel memory interface."),
- &bsd_kvm_cmdlist, "kvm ", 0, &cmdlist);
- #ifndef HAVE_STRUCT_THREAD_TD_PCB
- add_cmd ("proc", class_obscure, bsd_kvm_proc_cmd,
- _("Set current context from proc address"), &bsd_kvm_cmdlist);
- #endif
- add_cmd ("pcb", class_obscure, bsd_kvm_pcb_cmd,
-
- _("Set current context from pcb address"), &bsd_kvm_cmdlist);
-
- bsd_kvm_ptid = ptid_build (1, 1, 0);
- }