old-cross-binutils/gdb/linux-proc.c
Michael Snyder 2bf543a6e7 2002-01-10 Michael Snyder <msnyder@redhat.com>
* linux-proc.c: Add "info proc" command, a la procfs.c.
	(read_mapping): New function, abstract and re-use code.
	(linux_find_memory_regions): Use new func read_mapping.
	(linux_info_proc_cmd): New function, implement "info proc".
	(_initialize_linux_proc): Add new command "info proc".
2002-01-15 20:10:55 +00:00

554 lines
16 KiB
C

/* Linux-specific methods for using the /proc file system.
Copyright 2001, 2002 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 "inferior.h"
#include <sys/param.h> /* for MAXPATHLEN */
#include <sys/procfs.h> /* for elf_gregset etc. */
#include <sys/stat.h> /* for struct stat */
#include <ctype.h> /* for isdigit */
#include "gregset.h" /* for gregset */
#include "gdbcore.h" /* for get_exec_file */
#include "gdbthread.h" /* for struct thread_info etc. */
#include "elf-bfd.h" /* for elfcore_write_* */
#include "cli/cli-decode.h" /* for add_info */
/* Function: child_pid_to_exec_file
*
* Accepts an integer pid
* Returns a string representing a file that can be opened
* to get the symbols for the child process.
*/
char *
child_pid_to_exec_file (int pid)
{
char *name1, *name2;
name1 = xmalloc (MAXPATHLEN);
name2 = xmalloc (MAXPATHLEN);
make_cleanup (xfree, name1);
make_cleanup (xfree, name2);
memset (name2, 0, MAXPATHLEN);
sprintf (name1, "/proc/%d/exe", pid);
if (readlink (name1, name2, MAXPATHLEN) > 0)
return name2;
else
return name1;
}
/* Function: read_mappings
*
* Service function for corefiles and info proc.
*/
static int
read_mapping (FILE *mapfile,
long long *addr,
long long *endaddr,
char *permissions,
long long *offset,
char *device,
long long *inode,
char *filename)
{
int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx",
addr, endaddr, permissions, offset, device, inode);
if (ret > 0 && ret != EOF && *inode != 0)
{
ret += fscanf (mapfile, "%s\n", filename);
}
else
{
filename[0] = '\0'; /* no filename */
fscanf (mapfile, "\n");
}
return (ret != 0 && ret != EOF);
}
/* Function: linux_find_memory_regions
*
* Fills the "to_find_memory_regions" target vector.
* Lists the memory regions in the inferior for a corefile.
*/
static int
linux_find_memory_regions (int (*func) (CORE_ADDR,
unsigned long,
int, int, int,
void *),
void *obfd)
{
long long pid = PIDGET (inferior_ptid);
char mapsfilename[MAXPATHLEN];
FILE *mapsfile;
long long addr, endaddr, size, offset, inode;
char permissions[8], device[8], filename[MAXPATHLEN];
int read, write, exec;
int ret;
/* Compose the filename for the /proc memory map, and open it. */
sprintf (mapsfilename, "/proc/%lld/maps", pid);
if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
error ("Could not open %s\n", mapsfilename);
if (info_verbose)
fprintf_filtered (gdb_stdout,
"Reading memory regions from %s\n", mapsfilename);
/* Now iterate until end-of-file. */
while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0],
&offset, &device[0], &inode, &filename[0]))
{
size = endaddr - addr;
/* Get the segment's permissions. */
read = (strchr (permissions, 'r') != 0);
write = (strchr (permissions, 'w') != 0);
exec = (strchr (permissions, 'x') != 0);
if (info_verbose)
{
fprintf_filtered (gdb_stdout,
"Save segment, %lld bytes at 0x%s (%c%c%c)",
size, paddr_nz (addr),
read ? 'r' : ' ',
write ? 'w' : ' ',
exec ? 'x' : ' ');
if (filename && filename[0])
fprintf_filtered (gdb_stdout,
" for %s", filename);
fprintf_filtered (gdb_stdout, "\n");
}
/* Invoke the callback function to create the corefile segment. */
func (addr, size, read, write, exec, obfd);
}
fclose (mapsfile);
return 0;
}
/* Function: linux_do_thread_registers
*
* Records the thread's register state for the corefile note section.
*/
static char *
linux_do_thread_registers (bfd *obfd, ptid_t ptid,
char *note_data, int *note_size)
{
gdb_gregset_t gregs;
gdb_fpregset_t fpregs;
unsigned long merged_pid = ptid_get_tid (ptid) << 16 | ptid_get_pid (ptid);
fill_gregset (&gregs, -1);
note_data = (char *) elfcore_write_prstatus (obfd,
note_data,
note_size,
merged_pid,
stop_signal,
&gregs);
fill_fpregset (&fpregs, -1);
note_data = (char *) elfcore_write_prfpreg (obfd,
note_data,
note_size,
&fpregs,
sizeof (fpregs));
return note_data;
}
struct linux_corefile_thread_data {
bfd *obfd;
char *note_data;
int *note_size;
};
/* Function: linux_corefile_thread_callback
*
* Called by gdbthread.c once per thread.
* Records the thread's register state for the corefile note section.
*/
static int
linux_corefile_thread_callback (struct thread_info *ti, void *data)
{
struct linux_corefile_thread_data *args = data;
ptid_t saved_ptid = inferior_ptid;
inferior_ptid = ti->ptid;
registers_changed ();
target_fetch_registers (-1); /* FIXME should not be necessary;
fill_gregset should do it automatically. */
args->note_data = linux_do_thread_registers (args->obfd,
ti->ptid,
args->note_data,
args->note_size);
inferior_ptid = saved_ptid;
registers_changed ();
target_fetch_registers (-1); /* FIXME should not be necessary;
fill_gregset should do it automatically. */
return 0;
}
/* Function: linux_make_note_section
*
* Fills the "to_make_corefile_note" target vector.
* Builds the note section for a corefile, and returns it
* in a malloc buffer.
*/
static char *
linux_make_note_section (bfd *obfd, int *note_size)
{
struct linux_corefile_thread_data thread_args;
struct cleanup *old_chain;
char fname[16] = {'\0'};
char psargs[80] = {'\0'};
char *note_data = NULL;
ptid_t current_ptid = inferior_ptid;
if (get_exec_file (0))
{
strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname));
strncpy (psargs, get_exec_file (0),
sizeof (psargs));
if (get_inferior_args ())
{
strncat (psargs, " ",
sizeof (psargs) - strlen (psargs));
strncat (psargs, get_inferior_args (),
sizeof (psargs) - strlen (psargs));
}
note_data = (char *) elfcore_write_prpsinfo (obfd,
note_data,
note_size,
fname,
psargs);
}
/* Dump information for threads. */
thread_args.obfd = obfd;
thread_args.note_data = note_data;
thread_args.note_size = note_size;
iterate_over_threads (linux_corefile_thread_callback, &thread_args);
if (thread_args.note_data == note_data)
{
/* iterate_over_threads didn't come up with any threads;
just use inferior_ptid. */
note_data = linux_do_thread_registers (obfd, inferior_ptid,
note_data, note_size);
}
else
{
note_data = thread_args.note_data;
}
make_cleanup (xfree, note_data);
return note_data;
}
/*
* Function: linux_info_proc_cmd
*
* Implement the "info proc" command.
*/
static void
linux_info_proc_cmd (char *args, int from_tty)
{
long long pid = PIDGET (inferior_ptid);
FILE *procfile;
char **argv = NULL;
char buffer[MAXPATHLEN];
char fname1[MAXPATHLEN], fname2[MAXPATHLEN];
int cmdline_f = 1;
int cwd_f = 1;
int exe_f = 1;
int mappings_f = 0;
int environ_f = 0;
int status_f = 0;
int stat_f = 0;
int all = 0;
struct stat dummy;
if (args)
{
/* Break up 'args' into an argv array. */
if ((argv = buildargv (args)) == NULL)
nomem (0);
else
make_cleanup_freeargv (argv);
}
while (argv != NULL && *argv != NULL)
{
if (isdigit (argv[0][0]))
{
pid = strtoul (argv[0], NULL, 10);
}
else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0)
{
mappings_f = 1;
}
else if (strcmp (argv[0], "status") == 0)
{
status_f = 1;
}
else if (strcmp (argv[0], "stat") == 0)
{
stat_f = 1;
}
else if (strcmp (argv[0], "cmd") == 0)
{
cmdline_f = 1;
}
else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0)
{
exe_f = 1;
}
else if (strcmp (argv[0], "cwd") == 0)
{
cwd_f = 1;
}
else if (strncmp (argv[0], "all", strlen (argv[0])) == 0)
{
all = 1;
}
else
{
/* [...] (future options here) */
}
argv++;
}
if (pid == 0)
error ("No current process: you must name one.");
sprintf (fname1, "/proc/%lld", pid);
if (stat (fname1, &dummy) != 0)
error ("No /proc directory: '%s'", fname1);
printf_filtered ("process %lld\n", pid);
if (cmdline_f || all)
{
sprintf (fname1, "/proc/%lld/cmdline", pid);
if ((procfile = fopen (fname1, "r")) > 0)
{
fgets (buffer, sizeof (buffer), procfile);
printf_filtered ("cmdline = '%s'\n", buffer);
fclose (procfile);
}
else
warning ("unable to open /proc file '%s'", fname1);
}
if (cwd_f || all)
{
sprintf (fname1, "/proc/%lld/cwd", pid);
memset (fname2, 0, sizeof (fname2));
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
printf_filtered ("cwd = '%s'\n", fname2);
else
warning ("unable to read link '%s'", fname1);
}
if (exe_f || all)
{
sprintf (fname1, "/proc/%lld/exe", pid);
memset (fname2, 0, sizeof (fname2));
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
printf_filtered ("exe = '%s'\n", fname2);
else
warning ("unable to read link '%s'", fname1);
}
if (mappings_f || all)
{
sprintf (fname1, "/proc/%lld/maps", pid);
if ((procfile = fopen (fname1, "r")) > 0)
{
long long addr, endaddr, size, offset, inode;
char permissions[8], device[8], filename[MAXPATHLEN];
char *header_fmt_string, *data_fmt_string;
if (TARGET_ADDR_BIT == 32)
{
header_fmt_string = "\t%10s %10s %10s %10s %7s\n";
data_fmt_string = "\t%#10lx %#10lx %#10x %#10x %7s\n";
}
else
{
header_fmt_string = " %18s %18s %10s %10s %7s\n";
data_fmt_string = " %#18lx %#18lx %#10x %#10x %7s\n";
}
printf_filtered ("Mapped address spaces:\n\n");
printf_filtered (header_fmt_string,
"Start Addr",
" End Addr",
" Size",
" Offset",
"objfile");
while (read_mapping (procfile, &addr, &endaddr, &permissions[0],
&offset, &device[0], &inode, &filename[0]))
{
size = endaddr - addr;
printf_filtered (data_fmt_string,
(unsigned long) addr, /* FIXME: pr_addr */
(unsigned long) endaddr,
(int) size,
(unsigned int) offset,
filename[0] ? filename : "");
}
fclose (procfile);
}
else
warning ("unable to open /proc file '%s'", fname1);
}
if (status_f || all)
{
sprintf (fname1, "/proc/%lld/status", pid);
if ((procfile = fopen (fname1, "r")) > 0)
{
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
printf_filtered (buffer);
fclose (procfile);
}
else
warning ("unable to open /proc file '%s'", fname1);
}
if (stat_f || all)
{
sprintf (fname1, "/proc/%lld/stat", pid);
if ((procfile = fopen (fname1, "r")) > 0)
{
int itmp;
char ctmp;
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Process: %d\n", itmp);
if (fscanf (procfile, "%s ", &buffer[0]) > 0)
printf_filtered ("Exec file: %s\n", buffer);
if (fscanf (procfile, "%c ", &ctmp) > 0)
printf_filtered ("State: %c\n", ctmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Parent process: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Process group: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Session id: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("TTY: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("TTY owner process group: %d\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Flags: 0x%x\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Minor faults (no memory page): %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Minor faults, children: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Major faults (memory page faults): %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Major faults, children: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("utime: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("stime: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("utime, children: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("stime, children: %d\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("jiffies remaining in current time slice: %d\n",
itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("'nice' value: %d\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("jiffies until next timeout: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("jiffies until next SIGALRM: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("start time (jiffies since system boot): %d\n",
itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Virtual memory size: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Resident set size: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("rlim: %u\n",
(unsigned int) itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Start of text: 0x%x\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("End of text: 0x%x\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0)
printf_filtered ("Start of stack: 0x%x\n", itmp);
#if 0 /* Don't know how architecture-dependent the rest is...
Anyway the signal bitmap info is available from "status". */
if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */
printf_filtered ("Kernel stack pointer: 0x%x\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */
printf_filtered ("Kernel instr pointer: 0x%x\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Pending signals bitmap: 0x%x\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Blocked signals bitmap: 0x%x\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Ignored signals bitmap: 0x%x\n", itmp);
if (fscanf (procfile, "%d ", &itmp) > 0)
printf_filtered ("Catched signals bitmap: 0x%x\n", itmp);
if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */
printf_filtered ("wchan (system call): 0x%x\n", itmp);
#endif
fclose (procfile);
}
else
warning ("unable to open /proc file '%s'", fname1);
}
}
void
_initialize_linux_proc (void)
{
extern void inftarg_set_find_memory_regions ();
extern void inftarg_set_make_corefile_notes ();
inftarg_set_find_memory_regions (linux_find_memory_regions);
inftarg_set_make_corefile_notes (linux_make_note_section);
add_info ("proc", linux_info_proc_cmd,
"Show /proc process information about any running process.\n\
Specify any process id, or use the program being debugged by default.\n\
Specify any of the following keywords for detailed info:\n\
mappings -- list of mapped memory regions.\n\
stat -- list a bunch of random process info.\n\
status -- list a different bunch of random process info.\n\
all -- list all available /proc info.");
}