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binutils-gdb/gdb/osfsolib.c

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/* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* FIXME: Most of this code could be merged with solib.c by using
next_link_map_member and xfer_link_map_member in solib.c. */
#include "defs.h"
#include <sys/types.h>
#include <signal.h>
#include <string.h>
#include <fcntl.h>
#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbcore.h"
#include "command.h"
#include "target.h"
#include "frame.h"
#include "regex.h"
#include "inferior.h"
#include "language.h"
#define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */
/* FIXME: This is a terrible hack for shared library support under OSF/1.
The main problem is that the needed definitions are not contained in
the system header files.
The ldr_* routines described in loader(3) would be the way to go here.
But they do not work for arbitrary target processes (as documented). */
#ifndef USE_LDR_ROUTINES
#define RLD_CONTEXT_ADDRESS 0x3ffc0000000
typedef struct
{
CORE_ADDR next;
CORE_ADDR previous;
CORE_ADDR unknown;
char *module_name;
CORE_ADDR modinfo_addr;
} ldr_module_info_t;
typedef struct
{
CORE_ADDR unknown1;
CORE_ADDR unknown2;
CORE_ADDR head;
CORE_ADDR tail;
} ldr_context_t;
static ldr_context_t ldr_context;
#else
#include <loader.h>
#endif
/* Define our own link_map structure.
This will help to share code with solib.c. */
struct link_map {
CORE_ADDR l_addr; /* address at which object mapped */
char *l_name; /* full name of loaded object */
ldr_module_info_t module_info; /* corresponding module info */
};
#define LM_ADDR(so) ((so) -> lm.l_addr)
#define LM_NAME(so) ((so) -> lm.l_name)
struct so_list {
struct so_list *next; /* next structure in linked list */
struct link_map lm; /* copy of link map from inferior */
struct link_map *lmaddr; /* addr in inferior lm was read from */
CORE_ADDR lmend; /* upper addr bound of mapped object */
char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
char symbols_loaded; /* flag: symbols read in yet? */
char from_tty; /* flag: print msgs? */
struct objfile *objfile; /* objfile for loaded lib */
struct section_table *sections;
struct section_table *sections_end;
struct section_table *textsection;
bfd *abfd;
};
static struct so_list *so_list_head; /* List of known shared objects */
extern int
fdmatch PARAMS ((int, int)); /* In libiberty */
/* Local function prototypes */
static void
sharedlibrary_command PARAMS ((char *, int));
static void
info_sharedlibrary_command PARAMS ((char *, int));
static int
symbol_add_stub PARAMS ((char *));
static struct so_list *
find_solib PARAMS ((struct so_list *));
static struct link_map *
first_link_map_member PARAMS ((void));
static struct link_map *
next_link_map_member PARAMS ((struct so_list *));
static void
xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
static void
solib_map_sections PARAMS ((struct so_list *));
/*
LOCAL FUNCTION
solib_map_sections -- open bfd and build sections for shared lib
SYNOPSIS
static void solib_map_sections (struct so_list *so)
DESCRIPTION
Given a pointer to one of the shared objects in our list
of mapped objects, use the recorded name to open a bfd
descriptor for the object, build a section table, and then
relocate all the section addresses by the base address at
which the shared object was mapped.
FIXMES
In most (all?) cases the shared object file name recorded in the
dynamic linkage tables will be a fully qualified pathname. For
cases where it isn't, do we really mimic the systems search
mechanism correctly in the below code (particularly the tilde
expansion stuff?).
*/
static void
solib_map_sections (so)
struct so_list *so;
{
char *filename;
char *scratch_pathname;
int scratch_chan;
struct section_table *p;
struct cleanup *old_chain;
bfd *abfd;
filename = tilde_expand (so -> so_name);
old_chain = make_cleanup (free, filename);
scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
&scratch_pathname);
if (scratch_chan < 0)
{
scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
O_RDONLY, 0, &scratch_pathname);
}
if (scratch_chan < 0)
{
perror_with_name (filename);
}
/* Leave scratch_pathname allocated. bfd->name will point to it. */
abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
if (!abfd)
{
close (scratch_chan);
error ("Could not open `%s' as an executable file: %s",
scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
/* Leave bfd open, core_xfer_memory and "info files" need it. */
so -> abfd = abfd;
abfd -> cacheable = true;
if (!bfd_check_format (abfd, bfd_object))
{
error ("\"%s\": not in executable format: %s.",
scratch_pathname, bfd_errmsg (bfd_get_error ()));
}
if (build_section_table (abfd, &so -> sections, &so -> sections_end))
{
error ("Can't find the file sections in `%s': %s",
bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
}
for (p = so -> sections; p < so -> sections_end; p++)
{
/* Relocate the section binding addresses as recorded in the shared
object's file by the base address to which the object was actually
mapped. */
p -> addr += (CORE_ADDR) LM_ADDR (so);
p -> endaddr += (CORE_ADDR) LM_ADDR (so);
so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
if (STREQ (p -> the_bfd_section -> name, ".text"))
{
so -> textsection = p;
}
}
/* Free the file names, close the file now. */
do_cleanups (old_chain);
}
/*
LOCAL FUNCTION
first_link_map_member -- locate first member in dynamic linker's map
SYNOPSIS
static struct link_map *first_link_map_member (void)
DESCRIPTION
Read in a copy of the first member in the inferior's dynamic
link map from the inferior's dynamic linker structures, and return
a pointer to the copy in our address space.
*/
static struct link_map *
first_link_map_member ()
{
struct link_map *lm = NULL;
static struct link_map first_lm;
#ifdef USE_LDR_ROUTINES
ldr_module_t mod_id = LDR_NULL_MODULE;
size_t retsize;
if (ldr_next_module(inferior_pid, &mod_id) != 0
|| mod_id == LDR_NULL_MODULE
|| ldr_inq_module(inferior_pid, mod_id,
&first_lm.module_info, sizeof(ldr_module_info_t),
&retsize) != 0)
return lm;
#else
CORE_ADDR ldr_context_addr;
if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
(char *) &ldr_context_addr,
sizeof (CORE_ADDR)) != 0
|| target_read_memory (ldr_context_addr,
(char *) &ldr_context,
sizeof (ldr_context_t)) != 0
|| target_read_memory ((CORE_ADDR) ldr_context.head,
(char *) &first_lm.module_info,
sizeof (ldr_module_info_t)) != 0)
return lm;
#endif
lm = &first_lm;
/* The first entry is for the main program and should be skipped. */
lm->l_name = NULL;
return lm;
}
static struct link_map *
next_link_map_member (so_list_ptr)
struct so_list *so_list_ptr;
{
struct link_map *lm = NULL;
static struct link_map next_lm;
#ifdef USE_LDR_ROUTINES
ldr_module_t mod_id = lm->module_info.lmi_modid;
size_t retsize;
if (ldr_next_module(inferior_pid, &mod_id) != 0
|| mod_id == LDR_NULL_MODULE
|| ldr_inq_module(inferior_pid, mod_id,
&next_lm.module_info, sizeof(ldr_module_info_t),
&retsize) != 0)
return lm;
lm = &next_lm;
lm->l_name = lm->module_info.lmi_name;
#else
CORE_ADDR ldr_context_addr;
/* Reread context in case ldr_context.tail was updated. */
if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
(char *) &ldr_context_addr,
sizeof (CORE_ADDR)) != 0
|| target_read_memory (ldr_context_addr,
(char *) &ldr_context,
sizeof (ldr_context_t)) != 0
|| so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
|| target_read_memory (so_list_ptr->lm.module_info.next,
(char *) &next_lm.module_info,
sizeof (ldr_module_info_t)) != 0)
return lm;
lm = &next_lm;
lm->l_name = lm->module_info.module_name;
#endif
return lm;
}
static void
xfer_link_map_member (so_list_ptr, lm)
struct so_list *so_list_ptr;
struct link_map *lm;
{
so_list_ptr->lm = *lm;
/* OSF/1 has absolute addresses in shared libraries. */
LM_ADDR (so_list_ptr) = 0;
/* There is one entry that has no name (for the inferior executable)
since it is not a shared object. */
if (LM_NAME (so_list_ptr) != 0)
{
#ifdef USE_LDR_ROUTINES
int len = strlen (LM_NAME (so_list_ptr) + 1);
if (len > MAX_PATH_SIZE)
len = MAX_PATH_SIZE;
strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
#else
int errcode;
char *buffer;
target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
MAX_PATH_SIZE - 1, &errcode);
if (errcode != 0)
error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
safe_strerror (errcode));
strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
free (buffer);
#endif
so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
solib_map_sections (so_list_ptr);
}
}
/*
LOCAL FUNCTION
find_solib -- step through list of shared objects
SYNOPSIS
struct so_list *find_solib (struct so_list *so_list_ptr)
DESCRIPTION
This module contains the routine which finds the names of any
loaded "images" in the current process. The argument in must be
NULL on the first call, and then the returned value must be passed
in on subsequent calls. This provides the capability to "step" down
the list of loaded objects. On the last object, a NULL value is
returned.
The arg and return value are "struct link_map" pointers, as defined
in <link.h>.
*/
static struct so_list *
find_solib (so_list_ptr)
struct so_list *so_list_ptr; /* Last lm or NULL for first one */
{
struct so_list *so_list_next = NULL;
struct link_map *lm = NULL;
struct so_list *new;
if (so_list_ptr == NULL)
{
/* We are setting up for a new scan through the loaded images. */
if ((so_list_next = so_list_head) == NULL)
{
/* Find the first link map list member. */
lm = first_link_map_member ();
}
}
else
{
/* We have been called before, and are in the process of walking
the shared library list. Advance to the next shared object. */
lm = next_link_map_member (so_list_ptr);
so_list_next = so_list_ptr -> next;
}
if ((so_list_next == NULL) && (lm != NULL))
{
/* Get next link map structure from inferior image and build a local
abbreviated load_map structure */
new = (struct so_list *) xmalloc (sizeof (struct so_list));
memset ((char *) new, 0, sizeof (struct so_list));
new -> lmaddr = lm;
/* Add the new node as the next node in the list, or as the root
node if this is the first one. */
if (so_list_ptr != NULL)
{
so_list_ptr -> next = new;
}
else
{
so_list_head = new;
}
so_list_next = new;
xfer_link_map_member (new, lm);
}
return (so_list_next);
}
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
static int
symbol_add_stub (arg)
char *arg;
{
register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
so -> objfile = symbol_file_add (so -> so_name, so -> from_tty,
so -> textsection -> addr,
0, 0, 0);
return (1);
}
/*
GLOBAL FUNCTION
solib_add -- add a shared library file to the symtab and section list
SYNOPSIS
void solib_add (char *arg_string, int from_tty,
struct target_ops *target)
DESCRIPTION
*/
void
solib_add (arg_string, from_tty, target)
char *arg_string;
int from_tty;
struct target_ops *target;
{
register struct so_list *so = NULL; /* link map state variable */
/* Last shared library that we read. */
struct so_list *so_last = NULL;
char *re_err;
int count;
int old;
if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
{
error ("Invalid regexp: %s", re_err);
}
/* Add the shared library sections to the section table of the
specified target, if any. We have to do this before reading the
symbol files as symbol_file_add calls reinit_frame_cache and
creating a new frame might access memory in the shared library. */
if (target)
{
/* Count how many new section_table entries there are. */
so = NULL;
count = 0;
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
count += so -> sections_end - so -> sections;
}
}
if (count)
{
/* Reallocate the target's section table including the new size. */
if (target -> to_sections)
{
old = target -> to_sections_end - target -> to_sections;
target -> to_sections = (struct section_table *)
xrealloc ((char *)target -> to_sections,
(sizeof (struct section_table)) * (count + old));
}
else
{
old = 0;
target -> to_sections = (struct section_table *)
xmalloc ((sizeof (struct section_table)) * count);
}
target -> to_sections_end = target -> to_sections + (count + old);
/* Add these section table entries to the target's table. */
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
count = so -> sections_end - so -> sections;
memcpy ((char *) (target -> to_sections + old),
so -> sections,
(sizeof (struct section_table)) * count);
old += count;
}
}
}
}
/* Now add the symbol files. */
so = NULL;
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0] && re_exec (so -> so_name))
{
so -> from_tty = from_tty;
if (so -> symbols_loaded)
{
if (from_tty)
{
printf_unfiltered ("Symbols already loaded for %s\n", so -> so_name);
}
}
else if (catch_errors
(symbol_add_stub, (char *) so,
"Error while reading shared library symbols:\n",
RETURN_MASK_ALL))
{
so_last = so;
so -> symbols_loaded = 1;
}
}
}
}
/*
LOCAL FUNCTION
info_sharedlibrary_command -- code for "info sharedlibrary"
SYNOPSIS
static void info_sharedlibrary_command ()
DESCRIPTION
Walk through the shared library list and print information
about each attached library.
*/
static void
info_sharedlibrary_command (ignore, from_tty)
char *ignore;
int from_tty;
{
register struct so_list *so = NULL; /* link map state variable */
int header_done = 0;
if (exec_bfd == NULL)
{
printf_unfiltered ("No exec file.\n");
return;
}
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0])
{
unsigned long txt_start = 0;
unsigned long txt_end = 0;
if (!header_done)
{
printf_unfiltered("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
"Shared Object Library");
header_done++;
}
if (so -> textsection)
{
txt_start = (unsigned long) so -> textsection -> addr;
txt_end = (unsigned long) so -> textsection -> endaddr;
}
printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
printf_unfiltered ("%-12s", so -> symbols_loaded ? "Yes" : "No");
printf_unfiltered ("%s\n", so -> so_name);
}
}
if (so_list_head == NULL)
{
printf_unfiltered ("No shared libraries loaded at this time.\n");
}
}
/*
GLOBAL FUNCTION
solib_address -- check to see if an address is in a shared lib
SYNOPSIS
int solib_address (CORE_ADDR address)
DESCRIPTION
Provides a hook for other gdb routines to discover whether or
not a particular address is within the mapped address space of
a shared library. Any address between the base mapping address
and the first address beyond the end of the last mapping, is
considered to be within the shared library address space, for
our purposes.
For example, this routine is called at one point to disable
breakpoints which are in shared libraries that are not currently
mapped in.
*/
int
solib_address (address)
CORE_ADDR address;
{
register struct so_list *so = 0; /* link map state variable */
while ((so = find_solib (so)) != NULL)
{
if (so -> so_name[0] && so -> textsection)
{
if ((address >= (CORE_ADDR) so -> textsection -> addr) &&
(address < (CORE_ADDR) so -> textsection -> endaddr))
{
return (1);
}
}
}
return (0);
}
/* Called by free_all_symtabs */
void
clear_solib()
{
struct so_list *next;
char *bfd_filename;
while (so_list_head)
{
if (so_list_head -> sections)
{
free ((PTR)so_list_head -> sections);
}
if (so_list_head -> abfd)
{
bfd_filename = bfd_get_filename (so_list_head -> abfd);
bfd_close (so_list_head -> abfd);
}
else
/* This happens for the executable on SVR4. */
bfd_filename = NULL;
next = so_list_head -> next;
if (bfd_filename)
free ((PTR)bfd_filename);
free ((PTR)so_list_head);
so_list_head = next;
}
}
/*
GLOBAL FUNCTION
solib_create_inferior_hook -- shared library startup support
SYNOPSIS
void solib_create_inferior_hook()
DESCRIPTION
When gdb starts up the inferior, it nurses it along (through the
shell) until it is ready to execute it's first instruction. At this
point, this function gets called via expansion of the macro
SOLIB_CREATE_INFERIOR_HOOK.
For a statically bound executable, this first instruction is the
one at "_start", or a similar text label. No further processing is
needed in that case.
For a dynamically bound executable, this first instruction is somewhere
in the rld, and the actual user executable is not yet mapped in.
We continue the inferior again, rld then maps in the actual user
executable and any needed shared libraries and then sends
itself a SIGTRAP.
At that point we discover the names of all shared libraries and
read their symbols in.
FIXME
This code does not properly handle hitting breakpoints which the
user might have set in the rld itself. Proper handling would have
to check if the SIGTRAP happened due to a kill call.
Also, what if child has exit()ed? Must exit loop somehow.
*/
void
solib_create_inferior_hook()
{
/* Nothing to do for statically bound executables. */
if (symfile_objfile == 0 || symfile_objfile->ei.entry_file_lowpc == stop_pc)
return;
/* Now run the target. It will eventually get a SIGTRAP, at
which point all of the libraries will have been mapped in and we
can go groveling around in the rld structures to find
out what we need to know about them. */
clear_proceed_status ();
stop_soon_quietly = 1;
stop_signal = TARGET_SIGNAL_0;
do
{
target_resume (-1, 0, stop_signal);
wait_for_inferior ();
}
while (stop_signal != TARGET_SIGNAL_TRAP);
/* solib_add will call reinit_frame_cache via symbol_file_add.
But we are stopped in the runtime loader and we do not have symbols
for the runtime loader. So heuristic_proc_start will be called
and will put out an annoying warning.
Resetting stop_soon_quietly after symbol loading suppresses
the warning. */
solib_add ((char *) 0, 0, (struct target_ops *) 0);
stop_soon_quietly = 0;
}
/*
LOCAL FUNCTION
sharedlibrary_command -- handle command to explicitly add library
SYNOPSIS
static void sharedlibrary_command (char *args, int from_tty)
DESCRIPTION
*/
static void
sharedlibrary_command (args, from_tty)
char *args;
int from_tty;
{
dont_repeat ();
solib_add (args, from_tty, (struct target_ops *) 0);
}
void
_initialize_solib()
{
add_com ("sharedlibrary", class_files, sharedlibrary_command,
"Load shared object library symbols for files matching REGEXP.");
add_info ("sharedlibrary", info_sharedlibrary_command,
"Status of loaded shared object libraries.");
}
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