mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-11 14:14:23 +00:00
16c381f058
Rename and move inferior_thread_state and inferior_status. * gdbthread.h (struct thread_control_state): New struct, move fields step_range_start, step_range_end, step_frame_id, step_stack_frame_id, trap_expected, proceed_to_finish, in_infcall, step_over_calls, stop_step and stop_bpstat here from struct thread_info. (struct thread_suspend_state): New struct, move field stop_signal here from struct thread_info. (struct thread_info): Move the fields above from this struct. * inferior.h: Move the inferior_thread_state and inferior_status declarations comment to their definitions at infrun.c. (struct inferior_control_state): New struct, move field stop_soon from struct inferior here. (struct inferior_suspend_state): New empty struct. (struct inferior): New fields control and suspend. Move out field stop_soon. * infrun.c (struct inferior_thread_state): Rename to ... (infcall_suspend_state): ... here. Replace field stop_signal by fields thread_suspend and inferior_suspend. (save_inferior_thread_state): Rename to ... (save_infcall_suspend_state): ... here. New variable inf. Update the code for new fields. (restore_inferior_thread_state): Rename to ... (restore_infcall_suspend_state): ... here. New variable inf. Update the code for new fields. (do_restore_inferior_thread_state_cleanup): Rename to ... (do_restore_infcall_suspend_state_cleanup): ... here. (make_cleanup_restore_inferior_thread_state): Rename to ... (make_cleanup_restore_infcall_suspend_state): ... here. (discard_inferior_thread_state): Rename to ... (discard_infcall_suspend_state): ... here. (get_inferior_thread_state_regcache): Rename to ... (get_infcall_suspend_state_regcache): ... here. (struct inferior_status): Rename to ... (struct infcall_control_state): ... here. Replace fields step_range_start, step_range_end, step_frame_id, step_stack_frame_id, trap_expected, proceed_to_finish, in_infcall, step_over_calls, stop_step, stop_bpstat and stop_soon by fields thread_control and inferior_control. (save_inferior_status): Rename to ... (save_infcall_control_state): ... here. Update the code for new fields. (restore_inferior_status): Rename to ... (restore_infcall_control_state): ... here. Update the code for new fields. (do_restore_inferior_status_cleanup): Rename to ... (do_restore_infcall_control_state_cleanup): ... here. (make_cleanup_restore_inferior_status): Rename to ... (make_cleanup_restore_infcall_control_state): ... here. (discard_inferior_status): Rename to ... (discard_infcall_control_state): ... here. * alpha-tdep.c, breakpoint.c, dummy-frame.c, dummy-frame.h, exceptions.c, fbsd-nat.c, gdbthread.h, infcall.c, infcmd.c, inferior.c, inferior.h, infrun.c, linux-nat.c, mi/mi-interp.c, mips-tdep.c, procfs.c, solib-irix.c, solib-osf.c, solib-spu.c, solib-sunos.c, solib-svr4.c, thread.c, windows-nat.c: Update all the references to the moved fields and renamed functions.
849 lines
24 KiB
C
849 lines
24 KiB
C
/* Handle SunOS shared libraries for GDB, the GNU Debugger.
|
|
|
|
Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
|
|
2001, 2004, 2007, 2008, 2009, 2010 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 <sys/types.h>
|
|
#include <signal.h>
|
|
#include "gdb_string.h"
|
|
#include <sys/param.h>
|
|
#include <fcntl.h>
|
|
|
|
/* SunOS shared libs need the nlist structure. */
|
|
#include <a.out.h>
|
|
#include <link.h>
|
|
|
|
#include "symtab.h"
|
|
#include "bfd.h"
|
|
#include "symfile.h"
|
|
#include "objfiles.h"
|
|
#include "gdbcore.h"
|
|
#include "inferior.h"
|
|
#include "gdbthread.h"
|
|
#include "solist.h"
|
|
#include "bcache.h"
|
|
#include "regcache.h"
|
|
|
|
/* The shared library implementation found on BSD a.out systems is
|
|
very similar to the SunOS implementation. However, the data
|
|
structures defined in <link.h> are named very differently. Make up
|
|
for those differences here. */
|
|
|
|
#ifdef HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
|
|
|
|
/* FIXME: Temporary until the equivalent defines have been removed
|
|
from all nm-*bsd*.h files. */
|
|
#ifndef link_dynamic
|
|
|
|
/* Map `struct link_map' and its members. */
|
|
#define link_map so_map
|
|
#define lm_addr som_addr
|
|
#define lm_name som_path
|
|
#define lm_next som_next
|
|
|
|
/* Map `struct link_dynamic_2' and its members. */
|
|
#define link_dynamic_2 section_dispatch_table
|
|
#define ld_loaded sdt_loaded
|
|
|
|
/* Map `struct rtc_symb' and its members. */
|
|
#define rtc_symb rt_symbol
|
|
#define rtc_sp rt_sp
|
|
#define rtc_next rt_next
|
|
|
|
/* Map `struct ld_debug' and its members. */
|
|
#define ld_debug so_debug
|
|
#define ldd_in_debugger dd_in_debugger
|
|
#define ldd_bp_addr dd_bpt_addr
|
|
#define ldd_bp_inst dd_bpt_shadow
|
|
#define ldd_cp dd_cc
|
|
|
|
/* Map `struct link_dynamic' and its members. */
|
|
#define link_dynamic _dynamic
|
|
#define ld_version d_version
|
|
#define ldd d_debug
|
|
#define ld_un d_un
|
|
#define ld_2 d_sdt
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
/* Link map info to include in an allocated so_list entry */
|
|
|
|
struct lm_info
|
|
{
|
|
/* Pointer to copy of link map from inferior. The type is char *
|
|
rather than void *, so that we may use byte offsets to find the
|
|
various fields without the need for a cast. */
|
|
char *lm;
|
|
};
|
|
|
|
|
|
/* Symbols which are used to locate the base of the link map structures. */
|
|
|
|
static char *debug_base_symbols[] =
|
|
{
|
|
"_DYNAMIC",
|
|
"_DYNAMIC__MGC",
|
|
NULL
|
|
};
|
|
|
|
static char *main_name_list[] =
|
|
{
|
|
"main_$main",
|
|
NULL
|
|
};
|
|
|
|
/* Macro to extract an address from a solib structure. When GDB is
|
|
configured for some 32-bit targets (e.g. Solaris 2.7 sparc), BFD is
|
|
configured to handle 64-bit targets, so CORE_ADDR is 64 bits. We
|
|
have to extract only the significant bits of addresses to get the
|
|
right address when accessing the core file BFD.
|
|
|
|
Assume that the address is unsigned. */
|
|
|
|
#define SOLIB_EXTRACT_ADDRESS(MEMBER) \
|
|
extract_unsigned_integer (&(MEMBER), sizeof (MEMBER), \
|
|
gdbarch_byte_order (target_gdbarch))
|
|
|
|
/* local data declarations */
|
|
|
|
static struct link_dynamic dynamic_copy;
|
|
static struct link_dynamic_2 ld_2_copy;
|
|
static struct ld_debug debug_copy;
|
|
static CORE_ADDR debug_addr;
|
|
static CORE_ADDR flag_addr;
|
|
|
|
#ifndef offsetof
|
|
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
|
|
#endif
|
|
#define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
|
|
|
|
/* link map access functions */
|
|
|
|
static CORE_ADDR
|
|
LM_ADDR (struct so_list *so)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
|
|
int lm_addr_offset = offsetof (struct link_map, lm_addr);
|
|
int lm_addr_size = fieldsize (struct link_map, lm_addr);
|
|
|
|
return (CORE_ADDR) extract_signed_integer (so->lm_info->lm + lm_addr_offset,
|
|
lm_addr_size, byte_order);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
LM_NEXT (struct so_list *so)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
|
|
int lm_next_offset = offsetof (struct link_map, lm_next);
|
|
int lm_next_size = fieldsize (struct link_map, lm_next);
|
|
|
|
/* Assume that the address is unsigned. */
|
|
return extract_unsigned_integer (so->lm_info->lm + lm_next_offset,
|
|
lm_next_size, byte_order);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
LM_NAME (struct so_list *so)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
|
|
int lm_name_offset = offsetof (struct link_map, lm_name);
|
|
int lm_name_size = fieldsize (struct link_map, lm_name);
|
|
|
|
/* Assume that the address is unsigned. */
|
|
return extract_unsigned_integer (so->lm_info->lm + lm_name_offset,
|
|
lm_name_size, byte_order);
|
|
}
|
|
|
|
static CORE_ADDR debug_base; /* Base of dynamic linker structures */
|
|
|
|
/* Local function prototypes */
|
|
|
|
static int match_main (char *);
|
|
|
|
/* Allocate the runtime common object file. */
|
|
|
|
static void
|
|
allocate_rt_common_objfile (void)
|
|
{
|
|
struct objfile *objfile;
|
|
struct objfile *last_one;
|
|
|
|
objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
|
|
memset (objfile, 0, sizeof (struct objfile));
|
|
objfile->psymbol_cache = bcache_xmalloc ();
|
|
objfile->macro_cache = bcache_xmalloc ();
|
|
objfile->filename_cache = bcache_xmalloc ();
|
|
obstack_init (&objfile->objfile_obstack);
|
|
objfile->name = xstrdup ("rt_common");
|
|
|
|
/* Add this file onto the tail of the linked list of other such files. */
|
|
|
|
objfile->next = NULL;
|
|
if (object_files == NULL)
|
|
object_files = objfile;
|
|
else
|
|
{
|
|
for (last_one = object_files;
|
|
last_one->next;
|
|
last_one = last_one->next);
|
|
last_one->next = objfile;
|
|
}
|
|
|
|
rt_common_objfile = objfile;
|
|
}
|
|
|
|
/* Read all dynamically loaded common symbol definitions from the inferior
|
|
and put them into the minimal symbol table for the runtime common
|
|
objfile. */
|
|
|
|
static void
|
|
solib_add_common_symbols (CORE_ADDR rtc_symp)
|
|
{
|
|
struct rtc_symb inferior_rtc_symb;
|
|
struct nlist inferior_rtc_nlist;
|
|
int len;
|
|
char *name;
|
|
|
|
/* Remove any runtime common symbols from previous runs. */
|
|
|
|
if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count)
|
|
{
|
|
obstack_free (&rt_common_objfile->objfile_obstack, 0);
|
|
obstack_init (&rt_common_objfile->objfile_obstack);
|
|
rt_common_objfile->minimal_symbol_count = 0;
|
|
rt_common_objfile->msymbols = NULL;
|
|
terminate_minimal_symbol_table (rt_common_objfile);
|
|
}
|
|
|
|
init_minimal_symbol_collection ();
|
|
make_cleanup_discard_minimal_symbols ();
|
|
|
|
while (rtc_symp)
|
|
{
|
|
read_memory (rtc_symp,
|
|
(char *) &inferior_rtc_symb,
|
|
sizeof (inferior_rtc_symb));
|
|
read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_sp),
|
|
(char *) &inferior_rtc_nlist,
|
|
sizeof (inferior_rtc_nlist));
|
|
if (inferior_rtc_nlist.n_type == N_COMM)
|
|
{
|
|
/* FIXME: The length of the symbol name is not available, but in the
|
|
current implementation the common symbol is allocated immediately
|
|
behind the name of the symbol. */
|
|
len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
|
|
|
|
name = xmalloc (len);
|
|
read_memory (SOLIB_EXTRACT_ADDRESS (inferior_rtc_nlist.n_un.n_name),
|
|
name, len);
|
|
|
|
/* Allocate the runtime common objfile if necessary. */
|
|
if (rt_common_objfile == NULL)
|
|
allocate_rt_common_objfile ();
|
|
|
|
prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
|
|
mst_bss, rt_common_objfile);
|
|
xfree (name);
|
|
}
|
|
rtc_symp = SOLIB_EXTRACT_ADDRESS (inferior_rtc_symb.rtc_next);
|
|
}
|
|
|
|
/* Install any minimal symbols that have been collected as the current
|
|
minimal symbols for the runtime common objfile. */
|
|
|
|
install_minimal_symbols (rt_common_objfile);
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
locate_base -- locate the base address of dynamic linker structs
|
|
|
|
SYNOPSIS
|
|
|
|
CORE_ADDR locate_base (void)
|
|
|
|
DESCRIPTION
|
|
|
|
For both the SunOS and SVR4 shared library implementations, if the
|
|
inferior executable has been linked dynamically, there is a single
|
|
address somewhere in the inferior's data space which is the key to
|
|
locating all of the dynamic linker's runtime structures. This
|
|
address is the value of the debug base symbol. The job of this
|
|
function is to find and return that address, or to return 0 if there
|
|
is no such address (the executable is statically linked for example).
|
|
|
|
For SunOS, the job is almost trivial, since the dynamic linker and
|
|
all of it's structures are statically linked to the executable at
|
|
link time. Thus the symbol for the address we are looking for has
|
|
already been added to the minimal symbol table for the executable's
|
|
objfile at the time the symbol file's symbols were read, and all we
|
|
have to do is look it up there. Note that we explicitly do NOT want
|
|
to find the copies in the shared library.
|
|
|
|
The SVR4 version is a bit more complicated because the address
|
|
is contained somewhere in the dynamic info section. We have to go
|
|
to a lot more work to discover the address of the debug base symbol.
|
|
Because of this complexity, we cache the value we find and return that
|
|
value on subsequent invocations. Note there is no copy in the
|
|
executable symbol tables.
|
|
|
|
*/
|
|
|
|
static CORE_ADDR
|
|
locate_base (void)
|
|
{
|
|
struct minimal_symbol *msymbol;
|
|
CORE_ADDR address = 0;
|
|
char **symbolp;
|
|
|
|
/* For SunOS, we want to limit the search for the debug base symbol to the
|
|
executable being debugged, since there is a duplicate named symbol in the
|
|
shared library. We don't want the shared library versions. */
|
|
|
|
for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
|
|
{
|
|
msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile);
|
|
if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
|
|
{
|
|
address = SYMBOL_VALUE_ADDRESS (msymbol);
|
|
return (address);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
first_link_map_member -- locate first member in dynamic linker's map
|
|
|
|
SYNOPSIS
|
|
|
|
static CORE_ADDR first_link_map_member (void)
|
|
|
|
DESCRIPTION
|
|
|
|
Find the first element in the inferior's dynamic link map, and
|
|
return its address in the inferior. This function doesn't copy the
|
|
link map entry itself into our address space; current_sos actually
|
|
does the reading. */
|
|
|
|
static CORE_ADDR
|
|
first_link_map_member (void)
|
|
{
|
|
CORE_ADDR lm = 0;
|
|
|
|
read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
|
|
if (dynamic_copy.ld_version >= 2)
|
|
{
|
|
/* It is a version that we can deal with, so read in the secondary
|
|
structure and find the address of the link map list from it. */
|
|
read_memory (SOLIB_EXTRACT_ADDRESS (dynamic_copy.ld_un.ld_2),
|
|
(char *) &ld_2_copy, sizeof (struct link_dynamic_2));
|
|
lm = SOLIB_EXTRACT_ADDRESS (ld_2_copy.ld_loaded);
|
|
}
|
|
return (lm);
|
|
}
|
|
|
|
static int
|
|
open_symbol_file_object (void *from_ttyp)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* LOCAL FUNCTION
|
|
|
|
current_sos -- build a list of currently loaded shared objects
|
|
|
|
SYNOPSIS
|
|
|
|
struct so_list *current_sos ()
|
|
|
|
DESCRIPTION
|
|
|
|
Build a list of `struct so_list' objects describing the shared
|
|
objects currently loaded in the inferior. This list does not
|
|
include an entry for the main executable file.
|
|
|
|
Note that we only gather information directly available from the
|
|
inferior --- we don't examine any of the shared library files
|
|
themselves. The declaration of `struct so_list' says which fields
|
|
we provide values for. */
|
|
|
|
static struct so_list *
|
|
sunos_current_sos (void)
|
|
{
|
|
CORE_ADDR lm;
|
|
struct so_list *head = 0;
|
|
struct so_list **link_ptr = &head;
|
|
int errcode;
|
|
char *buffer;
|
|
|
|
/* Make sure we've looked up the inferior's dynamic linker's base
|
|
structure. */
|
|
if (! debug_base)
|
|
{
|
|
debug_base = locate_base ();
|
|
|
|
/* If we can't find the dynamic linker's base structure, this
|
|
must not be a dynamically linked executable. Hmm. */
|
|
if (! debug_base)
|
|
return 0;
|
|
}
|
|
|
|
/* Walk the inferior's link map list, and build our list of
|
|
`struct so_list' nodes. */
|
|
lm = first_link_map_member ();
|
|
while (lm)
|
|
{
|
|
struct so_list *new
|
|
= (struct so_list *) xmalloc (sizeof (struct so_list));
|
|
struct cleanup *old_chain = make_cleanup (xfree, new);
|
|
|
|
memset (new, 0, sizeof (*new));
|
|
|
|
new->lm_info = xmalloc (sizeof (struct lm_info));
|
|
make_cleanup (xfree, new->lm_info);
|
|
|
|
new->lm_info->lm = xmalloc (sizeof (struct link_map));
|
|
make_cleanup (xfree, new->lm_info->lm);
|
|
memset (new->lm_info->lm, 0, sizeof (struct link_map));
|
|
|
|
read_memory (lm, new->lm_info->lm, sizeof (struct link_map));
|
|
|
|
lm = LM_NEXT (new);
|
|
|
|
/* Extract this shared object's name. */
|
|
target_read_string (LM_NAME (new), &buffer,
|
|
SO_NAME_MAX_PATH_SIZE - 1, &errcode);
|
|
if (errcode != 0)
|
|
warning (_("Can't read pathname for load map: %s."),
|
|
safe_strerror (errcode));
|
|
else
|
|
{
|
|
strncpy (new->so_name, buffer, SO_NAME_MAX_PATH_SIZE - 1);
|
|
new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
|
|
xfree (buffer);
|
|
strcpy (new->so_original_name, new->so_name);
|
|
}
|
|
|
|
/* If this entry has no name, or its name matches the name
|
|
for the main executable, don't include it in the list. */
|
|
if (! new->so_name[0]
|
|
|| match_main (new->so_name))
|
|
free_so (new);
|
|
else
|
|
{
|
|
new->next = 0;
|
|
*link_ptr = new;
|
|
link_ptr = &new->next;
|
|
}
|
|
|
|
discard_cleanups (old_chain);
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
|
|
/* On some systems, the only way to recognize the link map entry for
|
|
the main executable file is by looking at its name. Return
|
|
non-zero iff SONAME matches one of the known main executable names. */
|
|
|
|
static int
|
|
match_main (char *soname)
|
|
{
|
|
char **mainp;
|
|
|
|
for (mainp = main_name_list; *mainp != NULL; mainp++)
|
|
{
|
|
if (strcmp (soname, *mainp) == 0)
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
sunos_in_dynsym_resolve_code (CORE_ADDR pc)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
disable_break -- remove the "mapping changed" breakpoint
|
|
|
|
SYNOPSIS
|
|
|
|
static int disable_break ()
|
|
|
|
DESCRIPTION
|
|
|
|
Removes the breakpoint that gets hit when the dynamic linker
|
|
completes a mapping change.
|
|
|
|
*/
|
|
|
|
static int
|
|
disable_break (void)
|
|
{
|
|
CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
|
|
|
|
int in_debugger = 0;
|
|
|
|
/* Read the debugger structure from the inferior to retrieve the
|
|
address of the breakpoint and the original contents of the
|
|
breakpoint address. Remove the breakpoint by writing the original
|
|
contents back. */
|
|
|
|
read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy));
|
|
|
|
/* Set `in_debugger' to zero now. */
|
|
|
|
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
|
|
|
|
breakpoint_addr = SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_bp_addr);
|
|
write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst,
|
|
sizeof (debug_copy.ldd_bp_inst));
|
|
|
|
/* For the SVR4 version, we always know the breakpoint address. For the
|
|
SunOS version we don't know it until the above code is executed.
|
|
Grumble if we are stopped anywhere besides the breakpoint address. */
|
|
|
|
if (stop_pc != breakpoint_addr)
|
|
{
|
|
warning (_("stopped at unknown breakpoint while handling shared libraries"));
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
enable_break -- arrange for dynamic linker to hit breakpoint
|
|
|
|
SYNOPSIS
|
|
|
|
int enable_break (void)
|
|
|
|
DESCRIPTION
|
|
|
|
Both the SunOS and the SVR4 dynamic linkers have, as part of their
|
|
debugger interface, support for arranging for the inferior to hit
|
|
a breakpoint after mapping in the shared libraries. This function
|
|
enables that breakpoint.
|
|
|
|
For SunOS, there is a special flag location (in_debugger) which we
|
|
set to 1. When the dynamic linker sees this flag set, it will set
|
|
a breakpoint at a location known only to itself, after saving the
|
|
original contents of that place and the breakpoint address itself,
|
|
in it's own internal structures. When we resume the inferior, it
|
|
will eventually take a SIGTRAP when it runs into the breakpoint.
|
|
We handle this (in a different place) by restoring the contents of
|
|
the breakpointed location (which is only known after it stops),
|
|
chasing around to locate the shared libraries that have been
|
|
loaded, then resuming.
|
|
|
|
For SVR4, the debugger interface structure contains a member (r_brk)
|
|
which is statically initialized at the time the shared library is
|
|
built, to the offset of a function (_r_debug_state) which is guaran-
|
|
teed to be called once before mapping in a library, and again when
|
|
the mapping is complete. At the time we are examining this member,
|
|
it contains only the unrelocated offset of the function, so we have
|
|
to do our own relocation. Later, when the dynamic linker actually
|
|
runs, it relocates r_brk to be the actual address of _r_debug_state().
|
|
|
|
The debugger interface structure also contains an enumeration which
|
|
is set to either RT_ADD or RT_DELETE prior to changing the mapping,
|
|
depending upon whether or not the library is being mapped or unmapped,
|
|
and then set to RT_CONSISTENT after the library is mapped/unmapped.
|
|
*/
|
|
|
|
static int
|
|
enable_break (void)
|
|
{
|
|
int success = 0;
|
|
int j;
|
|
int in_debugger;
|
|
|
|
/* Get link_dynamic structure */
|
|
|
|
j = target_read_memory (debug_base, (char *) &dynamic_copy,
|
|
sizeof (dynamic_copy));
|
|
if (j)
|
|
{
|
|
/* unreadable */
|
|
return (0);
|
|
}
|
|
|
|
/* Calc address of debugger interface structure */
|
|
|
|
debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd);
|
|
|
|
/* Calc address of `in_debugger' member of debugger interface structure */
|
|
|
|
flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
|
|
(char *) &debug_copy);
|
|
|
|
/* Write a value of 1 to this member. */
|
|
|
|
in_debugger = 1;
|
|
write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
|
|
success = 1;
|
|
|
|
return (success);
|
|
}
|
|
|
|
/*
|
|
|
|
LOCAL FUNCTION
|
|
|
|
special_symbol_handling -- additional shared library symbol handling
|
|
|
|
SYNOPSIS
|
|
|
|
void special_symbol_handling ()
|
|
|
|
DESCRIPTION
|
|
|
|
Once the symbols from a shared object have been loaded in the usual
|
|
way, we are called to do any system specific symbol handling that
|
|
is needed.
|
|
|
|
For SunOS4, this consists of grunging around in the dynamic
|
|
linkers structures to find symbol definitions for "common" symbols
|
|
and adding them to the minimal symbol table for the runtime common
|
|
objfile.
|
|
|
|
*/
|
|
|
|
static void
|
|
sunos_special_symbol_handling (void)
|
|
{
|
|
int j;
|
|
|
|
if (debug_addr == 0)
|
|
{
|
|
/* Get link_dynamic structure */
|
|
|
|
j = target_read_memory (debug_base, (char *) &dynamic_copy,
|
|
sizeof (dynamic_copy));
|
|
if (j)
|
|
{
|
|
/* unreadable */
|
|
return;
|
|
}
|
|
|
|
/* Calc address of debugger interface structure */
|
|
/* FIXME, this needs work for cross-debugging of core files
|
|
(byteorder, size, alignment, etc). */
|
|
|
|
debug_addr = SOLIB_EXTRACT_ADDRESS (dynamic_copy.ldd);
|
|
}
|
|
|
|
/* Read the debugger structure from the inferior, just to make sure
|
|
we have a current copy. */
|
|
|
|
j = target_read_memory (debug_addr, (char *) &debug_copy,
|
|
sizeof (debug_copy));
|
|
if (j)
|
|
return; /* unreadable */
|
|
|
|
/* Get common symbol definitions for the loaded object. */
|
|
|
|
if (debug_copy.ldd_cp)
|
|
{
|
|
solib_add_common_symbols (SOLIB_EXTRACT_ADDRESS (debug_copy.ldd_cp));
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
GLOBAL FUNCTION
|
|
|
|
sunos_solib_create_inferior_hook -- shared library startup support
|
|
|
|
SYNOPSIS
|
|
|
|
void sunos_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 SunOS executables, this first instruction is typically the
|
|
one at "_start", or a similar text label, regardless of whether
|
|
the executable is statically or dynamically linked. The runtime
|
|
startup code takes care of dynamically linking in any shared
|
|
libraries, once gdb allows the inferior to continue.
|
|
|
|
For SVR4 executables, this first instruction is either the first
|
|
instruction in the dynamic linker (for dynamically linked
|
|
executables) or the instruction at "start" for statically linked
|
|
executables. For dynamically linked executables, the system
|
|
first exec's /lib/libc.so.N, which contains the dynamic linker,
|
|
and starts it running. The dynamic linker maps in any needed
|
|
shared libraries, maps in the actual user executable, and then
|
|
jumps to "start" in the user executable.
|
|
|
|
For both SunOS shared libraries, and SVR4 shared libraries, we
|
|
can arrange to cooperate with the dynamic linker to discover the
|
|
names of shared libraries that are dynamically linked, and the
|
|
base addresses to which they are linked.
|
|
|
|
This function is responsible for discovering those names and
|
|
addresses, and saving sufficient information about them to allow
|
|
their symbols to be read at a later time.
|
|
|
|
FIXME
|
|
|
|
Between enable_break() and disable_break(), this code does not
|
|
properly handle hitting breakpoints which the user might have
|
|
set in the startup code or in the dynamic linker itself. Proper
|
|
handling will probably have to wait until the implementation is
|
|
changed to use the "breakpoint handler function" method.
|
|
|
|
Also, what if child has exit()ed? Must exit loop somehow.
|
|
*/
|
|
|
|
static void
|
|
sunos_solib_create_inferior_hook (int from_tty)
|
|
{
|
|
struct thread_info *tp;
|
|
struct inferior *inf;
|
|
|
|
if ((debug_base = locate_base ()) == 0)
|
|
{
|
|
/* Can't find the symbol or the executable is statically linked. */
|
|
return;
|
|
}
|
|
|
|
if (!enable_break ())
|
|
{
|
|
warning (_("shared library handler failed to enable breakpoint"));
|
|
return;
|
|
}
|
|
|
|
/* SCO and SunOS need the loop below, other systems should be using the
|
|
special shared library breakpoints and the shared library breakpoint
|
|
service routine.
|
|
|
|
Now run the target. It will eventually hit the breakpoint, at
|
|
which point all of the libraries will have been mapped in and we
|
|
can go groveling around in the dynamic linker structures to find
|
|
out what we need to know about them. */
|
|
|
|
inf = current_inferior ();
|
|
tp = inferior_thread ();
|
|
|
|
clear_proceed_status ();
|
|
|
|
inf->control.stop_soon = STOP_QUIETLY;
|
|
tp->suspend.stop_signal = TARGET_SIGNAL_0;
|
|
do
|
|
{
|
|
target_resume (pid_to_ptid (-1), 0, tp->suspend.stop_signal);
|
|
wait_for_inferior (0);
|
|
}
|
|
while (tp->suspend.stop_signal != TARGET_SIGNAL_TRAP);
|
|
inf->control.stop_soon = NO_STOP_QUIETLY;
|
|
|
|
/* We are now either at the "mapping complete" breakpoint (or somewhere
|
|
else, a condition we aren't prepared to deal with anyway), so adjust
|
|
the PC as necessary after a breakpoint, disable the breakpoint, and
|
|
add any shared libraries that were mapped in.
|
|
|
|
Note that adjust_pc_after_break did not perform any PC adjustment,
|
|
as the breakpoint the inferior just hit was not inserted by GDB,
|
|
but by the dynamic loader itself, and is therefore not found on
|
|
the GDB software break point list. Thus we have to adjust the
|
|
PC here. */
|
|
|
|
if (gdbarch_decr_pc_after_break (target_gdbarch))
|
|
{
|
|
stop_pc -= gdbarch_decr_pc_after_break (target_gdbarch);
|
|
regcache_write_pc (get_current_regcache (), stop_pc);
|
|
}
|
|
|
|
if (!disable_break ())
|
|
{
|
|
warning (_("shared library handler failed to disable breakpoint"));
|
|
}
|
|
|
|
solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
|
|
}
|
|
|
|
static void
|
|
sunos_clear_solib (void)
|
|
{
|
|
debug_base = 0;
|
|
}
|
|
|
|
static void
|
|
sunos_free_so (struct so_list *so)
|
|
{
|
|
xfree (so->lm_info->lm);
|
|
xfree (so->lm_info);
|
|
}
|
|
|
|
static void
|
|
sunos_relocate_section_addresses (struct so_list *so,
|
|
struct target_section *sec)
|
|
{
|
|
sec->addr += LM_ADDR (so);
|
|
sec->endaddr += LM_ADDR (so);
|
|
}
|
|
|
|
static struct target_so_ops sunos_so_ops;
|
|
|
|
void
|
|
_initialize_sunos_solib (void)
|
|
{
|
|
sunos_so_ops.relocate_section_addresses = sunos_relocate_section_addresses;
|
|
sunos_so_ops.free_so = sunos_free_so;
|
|
sunos_so_ops.clear_solib = sunos_clear_solib;
|
|
sunos_so_ops.solib_create_inferior_hook = sunos_solib_create_inferior_hook;
|
|
sunos_so_ops.special_symbol_handling = sunos_special_symbol_handling;
|
|
sunos_so_ops.current_sos = sunos_current_sos;
|
|
sunos_so_ops.open_symbol_file_object = open_symbol_file_object;
|
|
sunos_so_ops.in_dynsym_resolve_code = sunos_in_dynsym_resolve_code;
|
|
sunos_so_ops.bfd_open = solib_bfd_open;
|
|
|
|
/* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */
|
|
current_target_so_ops = &sunos_so_ops;
|
|
}
|