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fuchsia / third_party / binutils-gdb / 3fce8b70880e92081a4a8f341086152eca542c86 / . / gdb / linux-tdep.c
blob: a132fc6b8816aadf924759c737f9284e67ea6dba [file] [log] [blame]
/* Target-dependent code for GNU/Linux, architecture independent.
Copyright (C) 2009-2013 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbtypes.h"
#include "linux-tdep.h"
#include "auxv.h"
#include "target.h"
#include "gdbthread.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "elf/common.h"
#include "elf-bfd.h" /* for elfcore_write_* */
#include "inferior.h"
#include "cli/cli-utils.h"
#include "arch-utils.h"
#include "gdb_obstack.h"
#include "cli/cli-utils.h"
#include <ctype.h>
static struct gdbarch_data *linux_gdbarch_data_handle;
struct linux_gdbarch_data
{
struct type *siginfo_type;
};
static void *
init_linux_gdbarch_data (struct gdbarch *gdbarch)
{
return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct linux_gdbarch_data);
}
static struct linux_gdbarch_data *
get_linux_gdbarch_data (struct gdbarch *gdbarch)
{
return gdbarch_data (gdbarch, linux_gdbarch_data_handle);
}
/* This function is suitable for architectures that don't
extend/override the standard siginfo structure. */
struct type *
linux_get_siginfo_type (struct gdbarch *gdbarch)
{
struct linux_gdbarch_data *linux_gdbarch_data;
struct type *int_type, *uint_type, *long_type, *void_ptr_type;
struct type *uid_type, *pid_type;
struct type *sigval_type, *clock_type;
struct type *siginfo_type, *sifields_type;
struct type *type;
linux_gdbarch_data = get_linux_gdbarch_data (gdbarch);
if (linux_gdbarch_data->siginfo_type != NULL)
return linux_gdbarch_data->siginfo_type;
int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
0, "int");
uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
1, "unsigned int");
long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch),
0, "long");
void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);
/* sival_t */
sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
TYPE_NAME (sigval_type) = xstrdup ("sigval_t");
append_composite_type_field (sigval_type, "sival_int", int_type);
append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type);
/* __pid_t */
pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF,
TYPE_LENGTH (int_type), "__pid_t");
TYPE_TARGET_TYPE (pid_type) = int_type;
TYPE_TARGET_STUB (pid_type) = 1;
/* __uid_t */
uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF,
TYPE_LENGTH (uint_type), "__uid_t");
TYPE_TARGET_TYPE (uid_type) = uint_type;
TYPE_TARGET_STUB (uid_type) = 1;
/* __clock_t */
clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF,
TYPE_LENGTH (long_type), "__clock_t");
TYPE_TARGET_TYPE (clock_type) = long_type;
TYPE_TARGET_STUB (clock_type) = 1;
/* _sifields */
sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
{
const int si_max_size = 128;
int si_pad_size;
int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT;
/* _pad */
if (gdbarch_ptr_bit (gdbarch) == 64)
si_pad_size = (si_max_size / size_of_int) - 4;
else
si_pad_size = (si_max_size / size_of_int) - 3;
append_composite_type_field (sifields_type, "_pad",
init_vector_type (int_type, si_pad_size));
}
/* _kill */
type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (type, "si_pid", pid_type);
append_composite_type_field (type, "si_uid", uid_type);
append_composite_type_field (sifields_type, "_kill", type);
/* _timer */
type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (type, "si_tid", int_type);
append_composite_type_field (type, "si_overrun", int_type);
append_composite_type_field (type, "si_sigval", sigval_type);
append_composite_type_field (sifields_type, "_timer", type);
/* _rt */
type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (type, "si_pid", pid_type);
append_composite_type_field (type, "si_uid", uid_type);
append_composite_type_field (type, "si_sigval", sigval_type);
append_composite_type_field (sifields_type, "_rt", type);
/* _sigchld */
type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (type, "si_pid", pid_type);
append_composite_type_field (type, "si_uid", uid_type);
append_composite_type_field (type, "si_status", int_type);
append_composite_type_field (type, "si_utime", clock_type);
append_composite_type_field (type, "si_stime", clock_type);
append_composite_type_field (sifields_type, "_sigchld", type);
/* _sigfault */
type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (type, "si_addr", void_ptr_type);
append_composite_type_field (sifields_type, "_sigfault", type);
/* _sigpoll */
type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
append_composite_type_field (type, "si_band", long_type);
append_composite_type_field (type, "si_fd", int_type);
append_composite_type_field (sifields_type, "_sigpoll", type);
/* struct siginfo */
siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
TYPE_NAME (siginfo_type) = xstrdup ("siginfo");
append_composite_type_field (siginfo_type, "si_signo", int_type);
append_composite_type_field (siginfo_type, "si_errno", int_type);
append_composite_type_field (siginfo_type, "si_code", int_type);
append_composite_type_field_aligned (siginfo_type,
"_sifields", sifields_type,
TYPE_LENGTH (long_type));
linux_gdbarch_data->siginfo_type = siginfo_type;
return siginfo_type;
}
static int
linux_has_shared_address_space (struct gdbarch *gdbarch)
{
/* Determine whether we are running on uClinux or normal Linux
kernel. */
CORE_ADDR dummy;
int target_is_uclinux;
target_is_uclinux
= (target_auxv_search (&current_target, AT_NULL, &dummy) > 0
&& target_auxv_search (&current_target, AT_PAGESZ, &dummy) == 0);
return target_is_uclinux;
}
/* This is how we want PTIDs from core files to be printed. */
static char *
linux_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
{
static char buf[80];
if (ptid_get_lwp (ptid) != 0)
{
snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid));
return buf;
}
return normal_pid_to_str (ptid);
}
/* Service function for corefiles and info proc. */
static void
read_mapping (const char *line,
ULONGEST *addr, ULONGEST *endaddr,
const char **permissions, size_t *permissions_len,
ULONGEST *offset,
const char **device, size_t *device_len,
ULONGEST *inode,
const char **filename)
{
const char *p = line;
*addr = strtoulst (p, &p, 16);
if (*p == '-')
p++;
*endaddr = strtoulst (p, &p, 16);
p = skip_spaces_const (p);
*permissions = p;
while (*p && !isspace (*p))
p++;
*permissions_len = p - *permissions;
*offset = strtoulst (p, &p, 16);
p = skip_spaces_const (p);
*device = p;
while (*p && !isspace (*p))
p++;
*device_len = p - *device;
*inode = strtoulst (p, &p, 10);
p = skip_spaces_const (p);
*filename = p;
}
/* Implement the "info proc" command. */
static void
linux_info_proc (struct gdbarch *gdbarch, char *args,
enum info_proc_what what)
{
/* A long is used for pid instead of an int to avoid a loss of precision
compiler warning from the output of strtoul. */
long pid;
int cmdline_f = (what == IP_MINIMAL || what == IP_CMDLINE || what == IP_ALL);
int cwd_f = (what == IP_MINIMAL || what == IP_CWD || what == IP_ALL);
int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL);
int mappings_f = (what == IP_MAPPINGS || what == IP_ALL);
int status_f = (what == IP_STATUS || what == IP_ALL);
int stat_f = (what == IP_STAT || what == IP_ALL);
char filename[100];
gdb_byte *data;
int target_errno;
if (args && isdigit (args[0]))
pid = strtoul (args, &args, 10);
else
{
if (!target_has_execution)
error (_("No current process: you must name one."));
if (current_inferior ()->fake_pid_p)
error (_("Can't determine the current process's PID: you must name one."));
pid = current_inferior ()->pid;
}
args = skip_spaces (args);
if (args && args[0])
error (_("Too many parameters: %s"), args);
printf_filtered (_("process %ld\n"), pid);
if (cmdline_f)
{
xsnprintf (filename, sizeof filename, "/proc/%ld/cmdline", pid);
data = target_fileio_read_stralloc (filename);
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
printf_filtered ("cmdline = '%s'\n", data);
do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), filename);
}
if (cwd_f)
{
xsnprintf (filename, sizeof filename, "/proc/%ld/cwd", pid);
data = target_fileio_readlink (filename, &target_errno);
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
printf_filtered ("cwd = '%s'\n", data);
do_cleanups (cleanup);
}
else
warning (_("unable to read link '%s'"), filename);
}
if (exe_f)
{
xsnprintf (filename, sizeof filename, "/proc/%ld/exe", pid);
data = target_fileio_readlink (filename, &target_errno);
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
printf_filtered ("exe = '%s'\n", data);
do_cleanups (cleanup);
}
else
warning (_("unable to read link '%s'"), filename);
}
if (mappings_f)
{
xsnprintf (filename, sizeof filename, "/proc/%ld/maps", pid);
data = target_fileio_read_stralloc (filename);
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
char *line;
printf_filtered (_("Mapped address spaces:\n\n"));
if (gdbarch_addr_bit (gdbarch) == 32)
{
printf_filtered ("\t%10s %10s %10s %10s %s\n",
"Start Addr",
" End Addr",
" Size", " Offset", "objfile");
}
else
{
printf_filtered (" %18s %18s %10s %10s %s\n",
"Start Addr",
" End Addr",
" Size", " Offset", "objfile");
}
for (line = strtok (data, "\n"); line; line = strtok (NULL, "\n"))
{
ULONGEST addr, endaddr, offset, inode;
const char *permissions, *device, *filename;
size_t permissions_len, device_len;
read_mapping (line, &addr, &endaddr,
&permissions, &permissions_len,
&offset, &device, &device_len,
&inode, &filename);
if (gdbarch_addr_bit (gdbarch) == 32)
{
printf_filtered ("\t%10s %10s %10s %10s %s\n",
paddress (gdbarch, addr),
paddress (gdbarch, endaddr),
hex_string (endaddr - addr),
hex_string (offset),
*filename? filename : "");
}
else
{
printf_filtered (" %18s %18s %10s %10s %s\n",
paddress (gdbarch, addr),
paddress (gdbarch, endaddr),
hex_string (endaddr - addr),
hex_string (offset),
*filename? filename : "");
}
}
do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), filename);
}
if (status_f)
{
xsnprintf (filename, sizeof filename, "/proc/%ld/status", pid);
data = target_fileio_read_stralloc (filename);
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
puts_filtered (data);
do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), filename);
}
if (stat_f)
{
xsnprintf (filename, sizeof filename, "/proc/%ld/stat", pid);
data = target_fileio_read_stralloc (filename);
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
const char *p = data;
printf_filtered (_("Process: %s\n"),
pulongest (strtoulst (p, &p, 10)));
p = skip_spaces_const (p);
if (*p == '(')
{
const char *ep = strchr (p, ')');
if (ep != NULL)
{
printf_filtered ("Exec file: %.*s\n",
(int) (ep - p - 1), p + 1);
p = ep + 1;
}
}
p = skip_spaces_const (p);
if (*p)
printf_filtered (_("State: %c\n"), *p++);
if (*p)
printf_filtered (_("Parent process: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Process group: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Session id: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("TTY: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("TTY owner process group: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Flags: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Minor faults (no memory page): %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Minor faults, children: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Major faults (memory page faults): %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Major faults, children: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("utime: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("stime: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("utime, children: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("stime, children: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("jiffies remaining in current "
"time slice: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("'nice' value: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("jiffies until next timeout: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("jiffies until next SIGALRM: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("start time (jiffies since "
"system boot): %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Virtual memory size: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Resident set size: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("rlim: %s\n"),
pulongest (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Start of text: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("End of text: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Start of stack: %s\n"),
hex_string (strtoulst (p, &p, 10)));
#if 0 /* Don't know how architecture-dependent the rest is...
Anyway the signal bitmap info is available from "status". */
if (*p)
printf_filtered (_("Kernel stack pointer: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Kernel instr pointer: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Pending signals bitmap: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Blocked signals bitmap: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Ignored signals bitmap: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("Catched signals bitmap: %s\n"),
hex_string (strtoulst (p, &p, 10)));
if (*p)
printf_filtered (_("wchan (system call): %s\n"),
hex_string (strtoulst (p, &p, 10)));
#endif
do_cleanups (cleanup);
}
else
warning (_("unable to open /proc file '%s'"), filename);
}
}
/* Implement "info proc mappings" for a corefile. */
static void
linux_core_info_proc_mappings (struct gdbarch *gdbarch, char *args)
{
asection *section;
ULONGEST count, page_size;
unsigned char *descdata, *filenames, *descend, *contents;
size_t note_size;
unsigned int addr_size_bits, addr_size;
struct cleanup *cleanup;
struct gdbarch *core_gdbarch = gdbarch_from_bfd (core_bfd);
/* We assume this for reading 64-bit core files. */
gdb_static_assert (sizeof (ULONGEST) >= 8);
section = bfd_get_section_by_name (core_bfd, ".note.linuxcore.file");
if (section == NULL)
{
warning (_("unable to find mappings in core file"));
return;
}
addr_size_bits = gdbarch_addr_bit (core_gdbarch);
addr_size = addr_size_bits / 8;
note_size = bfd_get_section_size (section);
if (note_size < 2 * addr_size)
error (_("malformed core note - too short for header"));
contents = xmalloc (note_size);
cleanup = make_cleanup (xfree, contents);
if (!bfd_get_section_contents (core_bfd, section, contents, 0, note_size))
error (_("could not get core note contents"));
descdata = contents;
descend = descdata + note_size;
if (descdata[note_size - 1] != '\0')
error (_("malformed note - does not end with \\0"));
count = bfd_get (addr_size_bits, core_bfd, descdata);
descdata += addr_size;
page_size = bfd_get (addr_size_bits, core_bfd, descdata);
descdata += addr_size;
if (note_size < 2 * addr_size + count * 3 * addr_size)
error (_("malformed note - too short for supplied file count"));
printf_filtered (_("Mapped address spaces:\n\n"));
if (gdbarch_addr_bit (gdbarch) == 32)
{
printf_filtered ("\t%10s %10s %10s %10s %s\n",
"Start Addr",
" End Addr",
" Size", " Offset", "objfile");
}
else
{
printf_filtered (" %18s %18s %10s %10s %s\n",
"Start Addr",
" End Addr",
" Size", " Offset", "objfile");
}
filenames = descdata + count * 3 * addr_size;
while (--count > 0)
{
ULONGEST start, end, file_ofs;
if (filenames == descend)
error (_("malformed note - filenames end too early"));
start = bfd_get (addr_size_bits, core_bfd, descdata);
descdata += addr_size;
end = bfd_get (addr_size_bits, core_bfd, descdata);
descdata += addr_size;
file_ofs = bfd_get (addr_size_bits, core_bfd, descdata);
descdata += addr_size;
file_ofs *= page_size;
if (gdbarch_addr_bit (gdbarch) == 32)
printf_filtered ("\t%10s %10s %10s %10s %s\n",
paddress (gdbarch, start),
paddress (gdbarch, end),
hex_string (end - start),
hex_string (file_ofs),
filenames);
else
printf_filtered (" %18s %18s %10s %10s %s\n",
paddress (gdbarch, start),
paddress (gdbarch, end),
hex_string (end - start),
hex_string (file_ofs),
filenames);
filenames += 1 + strlen ((char *) filenames);
}
do_cleanups (cleanup);
}
/* Implement "info proc" for a corefile. */
static void
linux_core_info_proc (struct gdbarch *gdbarch, char *args,
enum info_proc_what what)
{
int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL);
int mappings_f = (what == IP_MAPPINGS || what == IP_ALL);
if (exe_f)
{
const char *exe;
exe = bfd_core_file_failing_command (core_bfd);
if (exe != NULL)
printf_filtered ("exe = '%s'\n", exe);
else
warning (_("unable to find command name in core file"));
}
if (mappings_f)
linux_core_info_proc_mappings (gdbarch, args);
if (!exe_f && !mappings_f)
error (_("unable to handle request"));
}
typedef int linux_find_memory_region_ftype (ULONGEST vaddr, ULONGEST size,
ULONGEST offset, ULONGEST inode,
int read, int write,
int exec, int modified,
const char *filename,
void *data);
/* List memory regions in the inferior for a corefile. */
static int
linux_find_memory_regions_full (struct gdbarch *gdbarch,
linux_find_memory_region_ftype *func,
void *obfd)
{
char filename[100];
gdb_byte *data;
/* We need to know the real target PID to access /proc. */
if (current_inferior ()->fake_pid_p)
return 1;
xsnprintf (filename, sizeof filename,
"/proc/%d/smaps", current_inferior ()->pid);
data = target_fileio_read_stralloc (filename);
if (data == NULL)
{
/* Older Linux kernels did not support /proc/PID/smaps. */
xsnprintf (filename, sizeof filename,
"/proc/%d/maps", current_inferior ()->pid);
data = target_fileio_read_stralloc (filename);
}
if (data)
{
struct cleanup *cleanup = make_cleanup (xfree, data);
char *line;
line = strtok (data, "\n");
while (line)
{
ULONGEST addr, endaddr, offset, inode;
const char *permissions, *device, *filename;
size_t permissions_len, device_len;
int read, write, exec;
int modified = 0, has_anonymous = 0;
read_mapping (line, &addr, &endaddr, &permissions, &permissions_len,
&offset, &device, &device_len, &inode, &filename);
/* Decode permissions. */
read = (memchr (permissions, 'r', permissions_len) != 0);
write = (memchr (permissions, 'w', permissions_len) != 0);
exec = (memchr (permissions, 'x', permissions_len) != 0);
/* Try to detect if region was modified by parsing smaps counters. */
for (line = strtok (NULL, "\n");
line && line[0] >= 'A' && line[0] <= 'Z';
line = strtok (NULL, "\n"))
{
char keyword[64 + 1];
unsigned long number;
if (sscanf (line, "%64s%lu kB\n", keyword, &number) != 2)
{
warning (_("Error parsing {s,}maps file '%s'"), filename);
break;
}
if (strcmp (keyword, "Anonymous:") == 0)
has_anonymous = 1;
if (number != 0 && (strcmp (keyword, "Shared_Dirty:") == 0
|| strcmp (keyword, "Private_Dirty:") == 0
|| strcmp (keyword, "Swap:") == 0
|| strcmp (keyword, "Anonymous:") == 0))
modified = 1;
}
/* Older Linux kernels did not support the "Anonymous:" counter.
If it is missing, we can't be sure - dump all the pages. */
if (!has_anonymous)
modified = 1;
/* Invoke the callback function to create the corefile segment. */
func (addr, endaddr - addr, offset, inode,
read, write, exec, modified, filename, obfd);
}
do_cleanups (cleanup);
return 0;
}
return 1;
}
/* A structure for passing information through
linux_find_memory_regions_full. */
struct linux_find_memory_regions_data
{
/* The original callback. */
find_memory_region_ftype func;
/* The original datum. */
void *obfd;
};
/* A callback for linux_find_memory_regions that converts between the
"full"-style callback and find_memory_region_ftype. */
static int
linux_find_memory_regions_thunk (ULONGEST vaddr, ULONGEST size,
ULONGEST offset, ULONGEST inode,
int read, int write, int exec, int modified,
const char *filename, void *arg)
{
struct linux_find_memory_regions_data *data = arg;
return data->func (vaddr, size, read, write, exec, modified, data->obfd);
}
/* A variant of linux_find_memory_regions_full that is suitable as the
gdbarch find_memory_regions method. */
static int
linux_find_memory_regions (struct gdbarch *gdbarch,
find_memory_region_ftype func, void *obfd)
{
struct linux_find_memory_regions_data data;
data.func = func;
data.obfd = obfd;
return linux_find_memory_regions_full (gdbarch,
linux_find_memory_regions_thunk,
&data);
}
/* Determine which signal stopped execution. */
static int
find_signalled_thread (struct thread_info *info, void *data)
{
if (info->suspend.stop_signal != GDB_SIGNAL_0
&& ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
return 1;
return 0;
}
static enum gdb_signal
find_stop_signal (void)
{
struct thread_info *info =
iterate_over_threads (find_signalled_thread, NULL);
if (info)
return info->suspend.stop_signal;
else
return GDB_SIGNAL_0;
}
/* Generate corefile notes for SPU contexts. */
static char *
linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size)
{
static const char *spu_files[] =
{
"object-id",
"mem",
"regs",
"fpcr",
"lslr",
"decr",
"decr_status",
"signal1",
"signal1_type",
"signal2",
"signal2_type",
"event_mask",
"event_status",
"mbox_info",
"ibox_info",
"wbox_info",
"dma_info",
"proxydma_info",
};
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
gdb_byte *spu_ids;
LONGEST i, j, size;
/* Determine list of SPU ids. */
size = target_read_alloc (&current_target, TARGET_OBJECT_SPU,
NULL, &spu_ids);
/* Generate corefile notes for each SPU file. */
for (i = 0; i < size; i += 4)
{
int fd = extract_unsigned_integer (spu_ids + i, 4, byte_order);
for (j = 0; j < sizeof (spu_files) / sizeof (spu_files[0]); j++)
{
char annex[32], note_name[32];
gdb_byte *spu_data;
LONGEST spu_len;
xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[j]);
spu_len = target_read_alloc (&current_target, TARGET_OBJECT_SPU,
annex, &spu_data);
if (spu_len > 0)
{
xsnprintf (note_name, sizeof note_name, "SPU/%s", annex);
note_data = elfcore_write_note (obfd, note_data, note_size,
note_name, NT_SPU,
spu_data, spu_len);
xfree (spu_data);
if (!note_data)
{
xfree (spu_ids);
return NULL;
}
}
}
}
if (size > 0)
xfree (spu_ids);
return note_data;
}
/* This is used to pass information from
linux_make_mappings_corefile_notes through
linux_find_memory_regions_full. */
struct linux_make_mappings_data
{
/* Number of files mapped. */
ULONGEST file_count;
/* The obstack for the main part of the data. */
struct obstack *data_obstack;
/* The filename obstack. */
struct obstack *filename_obstack;
/* The architecture's "long" type. */
struct type *long_type;
};
static linux_find_memory_region_ftype linux_make_mappings_callback;
/* A callback for linux_find_memory_regions_full that updates the
mappings data for linux_make_mappings_corefile_notes. */
static int
linux_make_mappings_callback (ULONGEST vaddr, ULONGEST size,
ULONGEST offset, ULONGEST inode,
int read, int write, int exec, int modified,
const char *filename, void *data)
{
struct linux_make_mappings_data *map_data = data;
gdb_byte buf[sizeof (ULONGEST)];
if (*filename == '\0' || inode == 0)
return 0;
++map_data->file_count;
pack_long (buf, map_data->long_type, vaddr);
obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type));
pack_long (buf, map_data->long_type, vaddr + size);
obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type));
pack_long (buf, map_data->long_type, offset);
obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type));
obstack_grow_str0 (map_data->filename_obstack, filename);
return 0;
}
/* Write the file mapping data to the core file, if possible. OBFD is
the output BFD. NOTE_DATA is the current note data, and NOTE_SIZE
is a pointer to the note size. Returns the new NOTE_DATA and
updates NOTE_SIZE. */
static char *
linux_make_mappings_corefile_notes (struct gdbarch *gdbarch, bfd *obfd,
char *note_data, int *note_size)
{
struct cleanup *cleanup;
struct obstack data_obstack, filename_obstack;
struct linux_make_mappings_data mapping_data;
struct type *long_type
= arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "long");
gdb_byte buf[sizeof (ULONGEST)];
obstack_init (&data_obstack);
cleanup = make_cleanup_obstack_free (&data_obstack);
obstack_init (&filename_obstack);
make_cleanup_obstack_free (&filename_obstack);
mapping_data.file_count = 0;
mapping_data.data_obstack = &data_obstack;
mapping_data.filename_obstack = &filename_obstack;
mapping_data.long_type = long_type;
/* Reserve space for the count. */
obstack_blank (&data_obstack, TYPE_LENGTH (long_type));
/* We always write the page size as 1 since we have no good way to
determine the correct value. */
pack_long (buf, long_type, 1);
obstack_grow (&data_obstack, buf, TYPE_LENGTH (long_type));
linux_find_memory_regions_full (gdbarch, linux_make_mappings_callback,
&mapping_data);
if (mapping_data.file_count != 0)
{
/* Write the count to the obstack. */
pack_long (obstack_base (&data_obstack), long_type,
mapping_data.file_count);
/* Copy the filenames to the data obstack. */
obstack_grow (&data_obstack, obstack_base (&filename_obstack),
obstack_object_size (&filename_obstack));
note_data = elfcore_write_note (obfd, note_data, note_size,
"CORE", NT_FILE,
obstack_base (&data_obstack),
obstack_object_size (&data_obstack));
}
do_cleanups (cleanup);
return note_data;
}
/* Records the thread's register state for the corefile note
section. */
static char *
linux_collect_thread_registers (const struct regcache *regcache,
ptid_t ptid, bfd *obfd,
char *note_data, int *note_size,
enum gdb_signal stop_signal)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct core_regset_section *sect_list;
unsigned long lwp;
sect_list = gdbarch_core_regset_sections (gdbarch);
gdb_assert (sect_list);
/* For remote targets the LWP may not be available, so use the TID. */
lwp = ptid_get_lwp (ptid);
if (!lwp)
lwp = ptid_get_tid (ptid);
while (sect_list->sect_name != NULL)
{
const struct regset *regset;
char *buf;
regset = gdbarch_regset_from_core_section (gdbarch,
sect_list->sect_name,
sect_list->size);
gdb_assert (regset && regset->collect_regset);
buf = xmalloc (sect_list->size);
regset->collect_regset (regset, regcache, -1, buf, sect_list->size);
/* PRSTATUS still needs to be treated specially. */
if (strcmp (sect_list->sect_name, ".reg") == 0)
note_data = (char *) elfcore_write_prstatus
(obfd, note_data, note_size, lwp,
gdb_signal_to_host (stop_signal), buf);
else
note_data = (char *) elfcore_write_register_note
(obfd, note_data, note_size,
sect_list->sect_name, buf, sect_list->size);
xfree (buf);
sect_list++;
if (!note_data)
return NULL;
}
return note_data;
}
/* Fetch the siginfo data for the current thread, if it exists. If
there is no data, or we could not read it, return NULL. Otherwise,
return a newly malloc'd buffer holding the data and fill in *SIZE
with the size of the data. The caller is responsible for freeing
the data. */
static gdb_byte *
linux_get_siginfo_data (struct gdbarch *gdbarch, LONGEST *size)
{
struct type *siginfo_type;
gdb_byte *buf;
LONGEST bytes_read;
struct cleanup *cleanups;
if (!gdbarch_get_siginfo_type_p (gdbarch))
return NULL;
siginfo_type = gdbarch_get_siginfo_type (gdbarch);
buf = xmalloc (TYPE_LENGTH (siginfo_type));
cleanups = make_cleanup (xfree, buf);
bytes_read = target_read (&current_target, TARGET_OBJECT_SIGNAL_INFO, NULL,
buf, 0, TYPE_LENGTH (siginfo_type));
if (bytes_read == TYPE_LENGTH (siginfo_type))
{
discard_cleanups (cleanups);
*size = bytes_read;
}
else
{
do_cleanups (cleanups);
buf = NULL;
}
return buf;
}
struct linux_corefile_thread_data
{
struct gdbarch *gdbarch;
int pid;
bfd *obfd;
char *note_data;
int *note_size;
int num_notes;
enum gdb_signal stop_signal;
linux_collect_thread_registers_ftype collect;
};
/* 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 *info, void *data)
{
struct linux_corefile_thread_data *args = data;
if (ptid_get_pid (info->ptid) == args->pid)
{
struct cleanup *old_chain;
struct regcache *regcache;
gdb_byte *siginfo_data;
LONGEST siginfo_size;
regcache = get_thread_arch_regcache (info->ptid, args->gdbarch);
old_chain = save_inferior_ptid ();
inferior_ptid = info->ptid;
target_fetch_registers (regcache, -1);
siginfo_data = linux_get_siginfo_data (args->gdbarch, &siginfo_size);
do_cleanups (old_chain);
old_chain = make_cleanup (xfree, siginfo_data);
args->note_data = args->collect (regcache, info->ptid, args->obfd,
args->note_data, args->note_size,
args->stop_signal);
args->num_notes++;
if (siginfo_data != NULL)
{
args->note_data = elfcore_write_note (args->obfd,
args->note_data,
args->note_size,
"CORE", NT_SIGINFO,
siginfo_data, siginfo_size);
args->num_notes++;
}
do_cleanups (old_chain);
}
return !args->note_data;
}
/* Fill the PRPSINFO structure with information about the process being
debugged. Returns 1 in case of success, 0 for failures. Please note that
even if the structure cannot be entirely filled (e.g., GDB was unable to
gather information about the process UID/GID), this function will still
return 1 since some information was already recorded. It will only return
0 iff nothing can be gathered. */
static int
linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p)
{
/* The filename which we will use to obtain some info about the process.
We will basically use this to store the `/proc/PID/FILENAME' file. */
char filename[100];
/* The full name of the program which generated the corefile. */
char *fname;
/* The basename of the executable. */
const char *basename;
/* The arguments of the program. */
char *psargs;
char *infargs;
/* The contents of `/proc/PID/stat' and `/proc/PID/status' files. */
char *proc_stat, *proc_status;
/* Temporary buffer. */
char *tmpstr;
/* The valid states of a process, according to the Linux kernel. */
const char valid_states[] = "RSDTZW";
/* The program state. */
const char *prog_state;
/* The state of the process. */
char pr_sname;
/* The PID of the program which generated the corefile. */
pid_t pid;
/* Process flags. */
unsigned int pr_flag;
/* Process nice value. */
long pr_nice;
/* The number of fields read by `sscanf'. */
int n_fields = 0;
/* Cleanups. */
struct cleanup *c;
int i;
gdb_assert (p != NULL);
/* Obtaining PID and filename. */
pid = ptid_get_pid (inferior_ptid);
xsnprintf (filename, sizeof (filename), "/proc/%d/cmdline", (int) pid);
fname = target_fileio_read_stralloc (filename);
if (fname == NULL || *fname == '\0')
{
/* No program name was read, so we won't be able to retrieve more
information about the process. */
xfree (fname);
return 0;
}
c = make_cleanup (xfree, fname);
memset (p, 0, sizeof (*p));
/* Defining the PID. */
p->pr_pid = pid;
/* Copying the program name. Only the basename matters. */
basename = lbasename (fname);
strncpy (p->pr_fname, basename, sizeof (p->pr_fname));
p->pr_fname[sizeof (p->pr_fname) - 1] = '\0';
infargs = get_inferior_args ();
psargs = xstrdup (fname);
if (infargs != NULL)
psargs = reconcat (psargs, psargs, " ", infargs, NULL);
make_cleanup (xfree, psargs);
strncpy (p->pr_psargs, psargs, sizeof (p->pr_psargs));
p->pr_psargs[sizeof (p->pr_psargs) - 1] = '\0';
xsnprintf (filename, sizeof (filename), "/proc/%d/stat", (int) pid);
proc_stat = target_fileio_read_stralloc (filename);
make_cleanup (xfree, proc_stat);
if (proc_stat == NULL || *proc_stat == '\0')
{
/* Despite being unable to read more information about the
process, we return 1 here because at least we have its
command line, PID and arguments. */
do_cleanups (c);
return 1;
}
/* Ok, we have the stats. It's time to do a little parsing of the
contents of the buffer, so that we end up reading what we want.
The following parsing mechanism is strongly based on the
information generated by the `fs/proc/array.c' file, present in
the Linux kernel tree. More details about how the information is
displayed can be obtained by seeing the manpage of proc(5),
specifically under the entry of `/proc/[pid]/stat'. */
/* Getting rid of the PID, since we already have it. */
while (isdigit (*proc_stat))
++proc_stat;
proc_stat = skip_spaces (proc_stat);
/* Getting rid of the executable name, since we already have it. We
know that this name will be in parentheses, so we can safely look
for the close-paren. */
while (*proc_stat != ')')
++proc_stat;
++proc_stat;
proc_stat = skip_spaces (proc_stat);
n_fields = sscanf (proc_stat,
"%c" /* Process state. */
"%d%d%d" /* Parent PID, group ID, session ID. */
"%*d%*d" /* tty_nr, tpgid (not used). */
"%u" /* Flags. */
"%*s%*s%*s%*s" /* minflt, cminflt, majflt,
cmajflt (not used). */
"%*s%*s%*s%*s" /* utime, stime, cutime,
cstime (not used). */
"%*s" /* Priority (not used). */
"%ld", /* Nice. */
&pr_sname,
&p->pr_ppid, &p->pr_pgrp, &p->pr_sid,
&pr_flag,
&pr_nice);
if (n_fields != 6)
{
/* Again, we couldn't read the complementary information about
the process state. However, we already have minimal
information, so we just return 1 here. */
do_cleanups (c);
return 1;
}
/* Filling the structure fields. */
prog_state = strchr (valid_states, pr_sname);
if (prog_state != NULL)
p->pr_state = prog_state - valid_states;
else
{
/* Zero means "Running". */
p->pr_state = 0;
}
p->pr_sname = p->pr_state > 5 ? '.' : pr_sname;
p->pr_zomb = p->pr_sname == 'Z';
p->pr_nice = pr_nice;
p->pr_flag = pr_flag;
/* Finally, obtaining the UID and GID. For that, we read and parse the
contents of the `/proc/PID/status' file. */
xsnprintf (filename, sizeof (filename), "/proc/%d/status", (int) pid);
proc_status = target_fileio_read_stralloc (filename);
make_cleanup (xfree, proc_status);
if (proc_status == NULL || *proc_status == '\0')
{
/* Returning 1 since we already have a bunch of information. */
do_cleanups (c);
return 1;
}
/* Extracting the UID. */
tmpstr = strstr (proc_status, "Uid:");
if (tmpstr != NULL)
{
/* Advancing the pointer to the beginning of the UID. */
tmpstr += sizeof ("Uid:");
while (*tmpstr != '\0' && !isdigit (*tmpstr))
++tmpstr;
if (isdigit (*tmpstr))
p->pr_uid = strtol (tmpstr, &tmpstr, 10);
}
/* Extracting the GID. */
tmpstr = strstr (proc_status, "Gid:");
if (tmpstr != NULL)
{
/* Advancing the pointer to the beginning of the GID. */
tmpstr += sizeof ("Gid:");
while (*tmpstr != '\0' && !isdigit (*tmpstr))
++tmpstr;
if (isdigit (*tmpstr))
p->pr_gid = strtol (tmpstr, &tmpstr, 10);
}
do_cleanups (c);
return 1;
}
/* Fills the "to_make_corefile_note" target vector. Builds the note
section for a corefile, and returns it in a malloc buffer. */
char *
linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size,
linux_collect_thread_registers_ftype collect)
{
struct linux_corefile_thread_data thread_args;
struct elf_internal_linux_prpsinfo prpsinfo;
char *note_data = NULL;
gdb_byte *auxv;
int auxv_len;
if (linux_fill_prpsinfo (&prpsinfo))
{
if (gdbarch_elfcore_write_linux_prpsinfo_p (gdbarch))
{
note_data = gdbarch_elfcore_write_linux_prpsinfo (gdbarch, obfd,
note_data, note_size,
&prpsinfo);
}
else
{
if (gdbarch_ptr_bit (gdbarch) == 64)
note_data = elfcore_write_linux_prpsinfo64 (obfd,
note_data, note_size,
&prpsinfo);
else
note_data = elfcore_write_linux_prpsinfo32 (obfd,
note_data, note_size,
&prpsinfo);
}
}
/* Thread register information. */
thread_args.gdbarch = gdbarch;
thread_args.pid = ptid_get_pid (inferior_ptid);
thread_args.obfd = obfd;
thread_args.note_data = note_data;
thread_args.note_size = note_size;
thread_args.num_notes = 0;
thread_args.stop_signal = find_stop_signal ();
thread_args.collect = collect;
iterate_over_threads (linux_corefile_thread_callback, &thread_args);
note_data = thread_args.note_data;
if (!note_data)
return NULL;
/* Auxillary vector. */
auxv_len = target_read_alloc (&current_target, TARGET_OBJECT_AUXV,
NULL, &auxv);
if (auxv_len > 0)
{
note_data = elfcore_write_note (obfd, note_data, note_size,
"CORE", NT_AUXV, auxv, auxv_len);
xfree (auxv);
if (!note_data)
return NULL;
}
/* SPU information. */
note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size);
if (!note_data)
return NULL;
/* File mappings. */
note_data = linux_make_mappings_corefile_notes (gdbarch, obfd,
note_data, note_size);
make_cleanup (xfree, note_data);
return note_data;
}
static char *
linux_make_corefile_notes_1 (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
{
/* FIXME: uweigand/2011-10-06: Once all GNU/Linux architectures have been
converted to gdbarch_core_regset_sections, we no longer need to fall back
to the target method at this point. */
if (!gdbarch_core_regset_sections (gdbarch))
return target_make_corefile_notes (obfd, note_size);
else
return linux_make_corefile_notes (gdbarch, obfd, note_size,
linux_collect_thread_registers);
}
/* To be called from the various GDB_OSABI_LINUX handlers for the
various GNU/Linux architectures and machine types. */
void
linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str);
set_gdbarch_info_proc (gdbarch, linux_info_proc);
set_gdbarch_core_info_proc (gdbarch, linux_core_info_proc);
set_gdbarch_find_memory_regions (gdbarch, linux_find_memory_regions);
set_gdbarch_make_corefile_notes (gdbarch, linux_make_corefile_notes_1);
set_gdbarch_has_shared_address_space (gdbarch,
linux_has_shared_address_space);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_linux_tdep;
void
_initialize_linux_tdep (void)
{
linux_gdbarch_data_handle =
gdbarch_data_register_post_init (init_linux_gdbarch_data);
}