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/* Handle HP SOM shared libraries for GDB, the GNU Debugger.
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Copyright 1993 , 1994 , 1995 , 1996 , 1998 , 1999 , 2000 , 2001
Free Software Foundation , Inc .
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This file is part of GDB .
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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 .
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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 .
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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 .
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Written by the Center for Software Science at the Univerity of Utah
and by Cygnus Support . */
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# include "defs.h"
# include "frame.h"
# include "bfd.h"
# include "som.h"
# include "libhppa.h"
# include "gdbcore.h"
# include "symtab.h"
# include "breakpoint.h"
# include "symfile.h"
# include "objfiles.h"
# include "inferior.h"
# include "gdb-stabs.h"
# include "gdb_stat.h"
# include "gdbcmd.h"
# include "assert.h"
# include "language.h"
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# include "regcache.h"
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# include <fcntl.h>
# ifndef O_BINARY
# define O_BINARY 0
# endif
/* Uncomment this to turn on some debugging output.
*/
/* #define SOLIB_DEBUG
*/
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/* Defined in exec.c; used to prevent dangling pointer bug.
*/
extern struct target_ops exec_ops ;
/* This lives in hppa-tdep.c. */
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extern struct unwind_table_entry * find_unwind_entry ( CORE_ADDR pc ) ;
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/* These ought to be defined in some public interface, but aren't. They
define the meaning of the various bits in the distinguished __dld_flags
variable that is declared in every debuggable a . out on HP - UX , and that
is shared between the debugger and the dynamic linker .
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*/
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# define DLD_FLAGS_MAPPRIVATE 0x1
# define DLD_FLAGS_HOOKVALID 0x2
# define DLD_FLAGS_LISTVALID 0x4
# define DLD_FLAGS_BOR_ENABLE 0x8
/* TODO:
* Most of this code should work for hp300 shared libraries . Does
anyone care enough to weed out any SOM - isms .
* Support for hpux8 dynamic linker . */
/* The basic structure which describes a dynamically loaded object. This
data structure is private to the dynamic linker and isn ' t found in
any HPUX include file . */
struct som_solib_mapped_entry
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{
/* The name of the library. */
char * name ;
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/* Version of this structure (it is expected to change again in hpux10). */
unsigned char struct_version ;
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/* Binding mode for this library. */
unsigned char bind_mode ;
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/* Version of this library. */
short library_version ;
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/* Start of text address,
* link - time text location ( length of text area ) ,
* end of text address . */
CORE_ADDR text_addr ;
CORE_ADDR text_link_addr ;
CORE_ADDR text_end ;
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/* Start of data, start of bss and end of data. */
CORE_ADDR data_start ;
CORE_ADDR bss_start ;
CORE_ADDR data_end ;
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/* Value of linkage pointer (%r19). */
CORE_ADDR got_value ;
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/* Next entry. */
struct som_solib_mapped_entry * next ;
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/* There are other fields, but I don't have information as to what is
contained in them . */
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/* For versions from HPUX-10.30 and up */
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/* Address in target of offset from thread-local register of
* start of this thread ' s data . I . e . , the first thread - local
* variable in this shared library starts at * ( tsd_start_addr )
* from that area pointed to by cr27 ( mpsfu_hi ) .
*
* We do the indirection as soon as we read it , so from then
* on it ' s the offset itself .
*/
CORE_ADDR tsd_start_addr ;
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/* Following this are longwords holding:
* ? , ? , ? , ptr to - 1 , ptr to - 1 , ptr to lib name ( leaf name ) ,
* ptr to __data_start , ptr to __data_end
*/
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} ;
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/* A structure to keep track of all the known shared objects. */
struct so_list
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{
struct som_solib_mapped_entry som_solib ;
struct objfile * objfile ;
bfd * abfd ;
struct section_table * sections ;
struct section_table * sections_end ;
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/* elz: added this field to store the address in target space (in the
library ) of the library descriptor ( handle ) which we read into
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som_solib_mapped_entry structure */
CORE_ADDR solib_addr ;
struct so_list * next ;
} ;
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static struct so_list * so_list_head ;
/* This is the cumulative size in bytes of the symbol tables of all
shared objects on the so_list_head list . ( When we say size , here
we mean of the information before it is brought into memory and
potentially expanded by GDB . ) When adding a new shlib , this value
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is compared against the threshold size , held by auto_solib_limit
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( in megabytes ) . If adding symbols for the new shlib would cause
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the total size to exceed the threshold , then the new shlib ' s
symbols are not loaded . */
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static LONGEST som_solib_total_st_size ;
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/* When the threshold is reached for any shlib, we refuse to add
symbols for subsequent shlibs , even if those shlibs ' symbols would
be small enough to fit under the threshold . ( Although this may
result in one , early large shlib preventing the loading of later ,
smalller shlibs ' symbols , it allows us to issue one informational
message . The alternative , to issue a message for each shlib whose
symbols aren ' t loaded , could be a big annoyance where the threshold
is exceeded due to a very large number of shlibs . )
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*/
static int som_solib_st_size_threshold_exceeded ;
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/* These addresses should be filled in by som_solib_create_inferior_hook.
They are also used elsewhere in this module .
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*/
typedef struct
{
CORE_ADDR address ;
struct unwind_table_entry * unwind ;
}
addr_and_unwind_t ;
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/* When adding fields, be sure to clear them in _initialize_som_solib. */
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static struct
{
boolean is_valid ;
addr_and_unwind_t hook ;
addr_and_unwind_t hook_stub ;
addr_and_unwind_t load ;
addr_and_unwind_t load_stub ;
addr_and_unwind_t unload ;
addr_and_unwind_t unload2 ;
addr_and_unwind_t unload_stub ;
}
dld_cache ;
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static void som_sharedlibrary_info_command ( char * , int ) ;
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static void som_solib_sharedlibrary_command ( char * , int ) ;
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static LONGEST
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som_solib_sizeof_symbol_table ( char * filename )
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{
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bfd * abfd ;
int desc ;
char * absolute_name ;
LONGEST st_size = ( LONGEST ) 0 ;
asection * sect ;
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/* We believe that filename was handed to us by the dynamic linker, and
is therefore always an absolute path .
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*/
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desc = openp ( getenv ( " PATH " ) , 1 , filename , O_RDONLY | O_BINARY , 0 , & absolute_name ) ;
if ( desc < 0 )
{
perror_with_name ( filename ) ;
}
filename = absolute_name ;
abfd = bfd_fdopenr ( filename , gnutarget , desc ) ;
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if ( ! abfd )
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{
close ( desc ) ;
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make_cleanup ( xfree , filename ) ;
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error ( " \" %s \" : can't open to read symbols: %s. " , filename ,
bfd_errmsg ( bfd_get_error ( ) ) ) ;
}
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if ( ! bfd_check_format ( abfd , bfd_object ) ) /* Reads in section info */
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{
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bfd_close ( abfd ) ; /* This also closes desc */
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make_cleanup ( xfree , filename ) ;
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error ( " \" %s \" : can't read symbols: %s. " , filename ,
bfd_errmsg ( bfd_get_error ( ) ) ) ;
}
/* Sum the sizes of the various sections that compose debug info. */
/* This contains non-DOC information. */
sect = bfd_get_section_by_name ( abfd , " $DEBUG$ " ) ;
if ( sect )
st_size + = ( LONGEST ) bfd_section_size ( abfd , sect ) ;
/* This contains DOC information. */
sect = bfd_get_section_by_name ( abfd , " $PINFO$ " ) ;
if ( sect )
st_size + = ( LONGEST ) bfd_section_size ( abfd , sect ) ;
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bfd_close ( abfd ) ; /* This also closes desc */
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xfree ( filename ) ;
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/* Unfortunately, just summing the sizes of various debug info
sections isn ' t a very accurate measurement of how much heap
space the debugger will need to hold them . It also doesn ' t
account for space needed by linker ( aka " minimal " ) symbols .
Anecdotal evidence suggests that just summing the sizes of
debug - info - related sections understates the heap space needed
to represent it internally by about an order of magnitude .
Since it ' s not exactly brain surgery we ' re doing here , rather
than attempt to more accurately measure the size of a shlib ' s
symbol table in GDB ' s heap , we ' ll just apply a 10 x fudge -
factor to the debug info sections ' size - sum . No , this doesn ' t
account for minimal symbols in non - debuggable shlibs . But it
all roughly washes out in the end .
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*/
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return st_size * ( LONGEST ) 10 ;
}
static void
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som_solib_add_solib_objfile ( struct so_list * so , char * name , int from_tty ,
CORE_ADDR text_addr )
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{
obj_private_data_t * obj_private ;
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struct obj_section * s ;
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so - > objfile = symbol_file_add ( name , from_tty , NULL , 0 , OBJF_SHARED ) ;
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so - > abfd = so - > objfile - > obfd ;
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/* syms_from_objfile has bizarre section offset code,
so I do my own right here . */
for ( s = so - > objfile - > sections ; s < so - > objfile - > sections_end ; s + + )
{
flagword aflag = bfd_get_section_flags ( so - > abfd , s - > the_bfd_section ) ;
if ( aflag & SEC_CODE )
{
s - > addr + = so - > som_solib . text_addr - so - > som_solib . text_link_addr ;
s - > endaddr + = so - > som_solib . text_addr - so - > som_solib . text_link_addr ;
}
else if ( aflag & SEC_DATA )
{
s - > addr + = so - > som_solib . data_start ;
s - > endaddr + = so - > som_solib . data_start ;
}
else
;
}
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/* Mark this as a shared library and save private data.
*/
so - > objfile - > flags | = OBJF_SHARED ;
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if ( so - > objfile - > obj_private = = NULL )
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{
obj_private = ( obj_private_data_t * )
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obstack_alloc ( & so - > objfile - > psymbol_obstack ,
sizeof ( obj_private_data_t ) ) ;
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obj_private - > unwind_info = NULL ;
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obj_private - > so_info = NULL ;
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so - > objfile - > obj_private = ( PTR ) obj_private ;
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}
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obj_private = ( obj_private_data_t * ) so - > objfile - > obj_private ;
obj_private - > so_info = so ;
if ( ! bfd_check_format ( so - > abfd , bfd_object ) )
{
error ( " \" %s \" : not in executable format: %s. " ,
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name , bfd_errmsg ( bfd_get_error ( ) ) ) ;
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}
}
static void
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som_solib_load_symbols ( struct so_list * so , char * name , int from_tty ,
CORE_ADDR text_addr , struct target_ops * target )
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{
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struct section_table * p ;
int status ;
char buf [ 4 ] ;
CORE_ADDR presumed_data_start ;
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# ifdef SOLIB_DEBUG
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printf ( " --Adding symbols for shared library \" %s \" \n " , name ) ;
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# endif
som_solib_add_solib_objfile ( so , name , from_tty , text_addr ) ;
/* Now we need to build a section table for this library since
we might be debugging a core file from a dynamically linked
executable in which the libraries were not privately mapped . */
if ( build_section_table ( so - > abfd ,
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& so - > sections ,
& so - > sections_end ) )
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{
error ( " Unable to build section table for shared library \n . " ) ;
return ;
}
/* Relocate all the sections based on where they got loaded. */
for ( p = so - > sections ; p < so - > sections_end ; p + + )
{
if ( p - > the_bfd_section - > flags & SEC_CODE )
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{
Elena Zannoni <ezannoni@kwikemart.cygnus.com>
* objfiles.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Define as functions of OBJFILE. Add
sect_index_text, sect_index_data, sect_index_rodata,
sect_index_bss to objfile structure.
* gdb-stabs.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Remove.
* objfiles.c (allocate_objfile): Initialize
sect_index_{text,data,bss,rodata} to -1, for error detection.
* symfile.c (default_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata} from bfd information.
* xcoffread.c (xcoff_symfile_offsets): Ditto.
* somread.c (som_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata}.
* coffread.c, dbxread.c, elfread.c, hp-psymtab-read.c,
hp-symtab-read.c, hpread.c, mdebugread.c, minsyms.c,
mipsread.c, objfiles.c, os9kread.c, pa64solib.c, partial-stab.h,
remote-os9k.c, remote-vx.c, remote.c, rs6000-nat.c, somsolib.c,
stabsread.c, symfile.c, xcoffread.c:
Update use of SECT_OFF_{TEXT,DATA,BSS,RODATA} to depend on the
current objfile.
* xcoffread.c: Add new field objfile to find_targ_sec_arg.
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p - > addr + = ANOFFSET ( so - > objfile - > section_offsets , SECT_OFF_TEXT ( so - > objfile ) ) ;
p - > endaddr + = ANOFFSET ( so - > objfile - > section_offsets , SECT_OFF_TEXT ( so - > objfile ) ) ;
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}
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else if ( p - > the_bfd_section - > flags & SEC_DATA )
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{
Elena Zannoni <ezannoni@kwikemart.cygnus.com>
* objfiles.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Define as functions of OBJFILE. Add
sect_index_text, sect_index_data, sect_index_rodata,
sect_index_bss to objfile structure.
* gdb-stabs.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Remove.
* objfiles.c (allocate_objfile): Initialize
sect_index_{text,data,bss,rodata} to -1, for error detection.
* symfile.c (default_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata} from bfd information.
* xcoffread.c (xcoff_symfile_offsets): Ditto.
* somread.c (som_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata}.
* coffread.c, dbxread.c, elfread.c, hp-psymtab-read.c,
hp-symtab-read.c, hpread.c, mdebugread.c, minsyms.c,
mipsread.c, objfiles.c, os9kread.c, pa64solib.c, partial-stab.h,
remote-os9k.c, remote-vx.c, remote.c, rs6000-nat.c, somsolib.c,
stabsread.c, symfile.c, xcoffread.c:
Update use of SECT_OFF_{TEXT,DATA,BSS,RODATA} to depend on the
current objfile.
* xcoffread.c: Add new field objfile to find_targ_sec_arg.
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p - > addr + = ANOFFSET ( so - > objfile - > section_offsets , SECT_OFF_DATA ( so - > objfile ) ) ;
p - > endaddr + = ANOFFSET ( so - > objfile - > section_offsets , SECT_OFF_DATA ( so - > objfile ) ) ;
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}
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}
/* Now see if we need to map in the text and data for this shared
library ( for example debugging a core file which does not use
private shared libraries . ) .
Carefully peek at the first text address in the library . If the
read succeeds , then the libraries were privately mapped and were
included in the core dump file .
If the peek failed , then the libraries were not privately mapped
and are not in the core file , we ' ll have to read them in ourselves . */
status = target_read_memory ( text_addr , buf , 4 ) ;
if ( status ! = 0 )
{
int old , new ;
new = so - > sections_end - so - > sections ;
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old = target_resize_to_sections ( target , new ) ;
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/* Copy over the old data before it gets clobbered. */
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memcpy ( ( char * ) ( target - > to_sections + old ) ,
so - > sections ,
( ( sizeof ( struct section_table ) ) * new ) ) ;
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}
}
/* Add symbols from shared libraries into the symtab list, unless the
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size threshold specified by auto_solib_limit ( in megabytes ) would
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be exceeded . */
void
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som_solib_add ( char * arg_string , int from_tty , struct target_ops * target , int readsyms )
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{
struct minimal_symbol * msymbol ;
struct so_list * so_list_tail ;
CORE_ADDR addr ;
asection * shlib_info ;
int status ;
unsigned int dld_flags ;
char buf [ 4 ] , * re_err ;
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int threshold_warning_given = 0 ;
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/* First validate our arguments. */
if ( ( re_err = re_comp ( arg_string ? arg_string : " . " ) ) ! = NULL )
{
error ( " Invalid regexp: %s " , re_err ) ;
}
/* If we're debugging a core file, or have attached to a running
process , then som_solib_create_inferior_hook will not have been
called .
We need to first determine if we ' re dealing with a dynamically
linked executable . If not , then return without an error or warning .
We also need to examine __dld_flags to determine if the shared library
list is valid and to determine if the libraries have been privately
mapped . */
if ( symfile_objfile = = NULL )
return ;
/* First see if the objfile was dynamically linked. */
shlib_info = bfd_get_section_by_name ( symfile_objfile - > obfd , " $SHLIB_INFO$ " ) ;
if ( ! shlib_info )
return ;
/* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
if ( bfd_section_size ( symfile_objfile - > obfd , shlib_info ) = = 0 )
return ;
msymbol = lookup_minimal_symbol ( " __dld_flags " , NULL , NULL ) ;
if ( msymbol = = NULL )
{
error ( " Unable to find __dld_flags symbol in object file. \n " ) ;
return ;
}
addr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
/* Read the current contents. */
status = target_read_memory ( addr , buf , 4 ) ;
if ( status ! = 0 )
{
error ( " Unable to read __dld_flags \n " ) ;
return ;
}
dld_flags = extract_unsigned_integer ( buf , 4 ) ;
/* __dld_list may not be valid. If not, then we punt, warning the user if
we were called as a result of the add - symfile command .
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*/
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if ( ( dld_flags & DLD_FLAGS_LISTVALID ) = = 0 )
{
if ( from_tty )
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error ( " __dld_list is not valid according to __dld_flags. \n " ) ;
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return ;
}
/* If the libraries were not mapped private, warn the user. */
if ( ( dld_flags & DLD_FLAGS_MAPPRIVATE ) = = 0 )
warning ( " The shared libraries were not privately mapped; setting a \n breakpoint in a shared library will not work until you rerun the program. \n " ) ;
msymbol = lookup_minimal_symbol ( " __dld_list " , NULL , NULL ) ;
if ( ! msymbol )
{
/* Older crt0.o files (hpux8) don't have __dld_list as a symbol,
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but the data is still available if you know where to look . */
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msymbol = lookup_minimal_symbol ( " __dld_flags " , NULL , NULL ) ;
if ( ! msymbol )
{
error ( " Unable to find dynamic library list. \n " ) ;
return ;
}
addr = SYMBOL_VALUE_ADDRESS ( msymbol ) - 8 ;
}
else
addr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
status = target_read_memory ( addr , buf , 4 ) ;
if ( status ! = 0 )
{
error ( " Unable to find dynamic library list. \n " ) ;
return ;
}
addr = extract_unsigned_integer ( buf , 4 ) ;
/* If addr is zero, then we're using an old dynamic loader which
doesn ' t maintain __dld_list . We ' ll have to use a completely
different approach to get shared library information . */
if ( addr = = 0 )
goto old_dld ;
/* Using the information in __dld_list is the preferred method
to get at shared library information . It doesn ' t depend on
any functions in / opt / langtools / lib / end . o and has a chance of working
with hpux10 when it is released . */
status = target_read_memory ( addr , buf , 4 ) ;
if ( status ! = 0 )
{
error ( " Unable to find dynamic library list. \n " ) ;
return ;
}
/* addr now holds the address of the first entry in the dynamic
library list . */
addr = extract_unsigned_integer ( buf , 4 ) ;
/* Now that we have a pointer to the dynamic library list, walk
through it and add the symbols for each library . */
so_list_tail = so_list_head ;
/* Find the end of the list of shared objects. */
while ( so_list_tail & & so_list_tail - > next )
so_list_tail = so_list_tail - > next ;
# ifdef SOLIB_DEBUG
1999-07-08 04:19:36 +08:00
printf ( " --About to read shared library list data \n " ) ;
1999-04-16 09:35:26 +08:00
# endif
/* "addr" will always point to the base of the
* current data entry describing the current
* shared library .
*/
while ( 1 )
{
CORE_ADDR name_addr , text_addr ;
unsigned int name_len ;
char * name ;
struct so_list * new_so ;
struct so_list * so_list = so_list_head ;
struct stat statbuf ;
1999-07-08 04:19:36 +08:00
LONGEST st_size ;
int is_main_program ;
1999-04-16 09:35:26 +08:00
if ( addr = = 0 )
break ;
/* Get a pointer to the name of this library. */
status = target_read_memory ( addr , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
name_addr = extract_unsigned_integer ( buf , 4 ) ;
name_len = 0 ;
while ( 1 )
{
target_read_memory ( name_addr + name_len , buf , 1 ) ;
if ( status ! = 0 )
goto err ;
name_len + + ;
if ( * buf = = ' \0 ' )
break ;
}
name = alloca ( name_len ) ;
status = target_read_memory ( name_addr , name , name_len ) ;
if ( status ! = 0 )
goto err ;
/* See if we've already loaded something with this name. */
while ( so_list )
{
if ( ! strcmp ( so_list - > som_solib . name , name ) )
break ;
so_list = so_list - > next ;
}
/* See if the file exists. If not, give a warning, but don't
1999-07-08 04:19:36 +08:00
die . */
1999-04-16 09:35:26 +08:00
status = stat ( name , & statbuf ) ;
if ( status = = - 1 )
{
warning ( " Can't find file %s referenced in dld_list. " , name ) ;
status = target_read_memory ( addr + 36 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
1999-07-08 04:19:36 +08:00
addr = ( CORE_ADDR ) extract_unsigned_integer ( buf , 4 ) ;
1999-04-16 09:35:26 +08:00
continue ;
}
/* If we've already loaded this one or it's the main program, skip it. */
is_main_program = ( strcmp ( name , symfile_objfile - > name ) = = 0 ) ;
if ( so_list | | is_main_program )
{
1999-07-08 04:19:36 +08:00
/* This is the "next" pointer in the strcuture.
*/
1999-04-16 09:35:26 +08:00
status = target_read_memory ( addr + 36 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
addr = ( CORE_ADDR ) extract_unsigned_integer ( buf , 4 ) ;
1999-07-08 04:19:36 +08:00
/* Record the main program's symbol table size. */
if ( is_main_program & & ! so_list )
{
st_size = som_solib_sizeof_symbol_table ( name ) ;
som_solib_total_st_size + = st_size ;
}
/* Was this a shlib that we noted but didn't load the symbols for?
If so , were we invoked this time from the command - line , via
a ' sharedlibrary ' or ' add - symbol - file ' command ? If yes to
both , we ' d better load the symbols this time .
*/
if ( from_tty & & so_list & & ! is_main_program & & ( so_list - > objfile = = NULL ) )
som_solib_load_symbols ( so_list ,
name ,
from_tty ,
so_list - > som_solib . text_addr ,
target ) ;
1999-04-16 09:35:26 +08:00
continue ;
}
name = obsavestring ( name , name_len - 1 ,
& symfile_objfile - > symbol_obstack ) ;
status = target_read_memory ( addr + 8 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
text_addr = extract_unsigned_integer ( buf , 4 ) ;
new_so = ( struct so_list * ) xmalloc ( sizeof ( struct so_list ) ) ;
1999-07-08 04:19:36 +08:00
memset ( ( char * ) new_so , 0 , sizeof ( struct so_list ) ) ;
1999-04-16 09:35:26 +08:00
if ( so_list_head = = NULL )
{
so_list_head = new_so ;
so_list_tail = new_so ;
}
else
{
so_list_tail - > next = new_so ;
so_list_tail = new_so ;
}
/* Fill in all the entries in GDB's shared library list.
*/
1999-07-08 04:19:36 +08:00
1999-04-16 09:35:26 +08:00
new_so - > solib_addr = addr ;
new_so - > som_solib . name = name ;
status = target_read_memory ( addr + 4 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . struct_version = extract_unsigned_integer ( buf + 3 , 1 ) ;
new_so - > som_solib . bind_mode = extract_unsigned_integer ( buf + 2 , 1 ) ;
1999-07-08 04:19:36 +08:00
/* Following is "high water mark", highest version number
* seen , rather than plain version number .
*/
1999-04-16 09:35:26 +08:00
new_so - > som_solib . library_version = extract_unsigned_integer ( buf , 2 ) ;
new_so - > som_solib . text_addr = text_addr ;
1999-07-08 04:19:36 +08:00
/* Q: What about longword at "addr + 8"?
* A : It ' s read above , out of order , into " text_addr " .
*/
1999-04-16 09:35:26 +08:00
status = target_read_memory ( addr + 12 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . text_link_addr = extract_unsigned_integer ( buf , 4 ) ;
status = target_read_memory ( addr + 16 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . text_end = extract_unsigned_integer ( buf , 4 ) ;
status = target_read_memory ( addr + 20 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . data_start = extract_unsigned_integer ( buf , 4 ) ;
status = target_read_memory ( addr + 24 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . bss_start = extract_unsigned_integer ( buf , 4 ) ;
status = target_read_memory ( addr + 28 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . data_end = extract_unsigned_integer ( buf , 4 ) ;
status = target_read_memory ( addr + 32 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
new_so - > som_solib . got_value = extract_unsigned_integer ( buf , 4 ) ;
status = target_read_memory ( addr + 36 , buf , 4 ) ;
if ( status ! = 0 )
goto err ;
2001-10-24 09:19:12 +08:00
new_so - > som_solib . next =
address_to_host_pointer ( extract_unsigned_integer ( buf , 4 ) ) ;
1999-04-16 09:35:26 +08:00
/* Note that we don't re-set "addr" to the next pointer
* until after we ' ve read the trailing data .
*/
status = target_read_memory ( addr + 40 , buf , 4 ) ;
new_so - > som_solib . tsd_start_addr = extract_unsigned_integer ( buf , 4 ) ;
if ( status ! = 0 )
1999-07-08 04:19:36 +08:00
goto err ;
1999-04-16 09:35:26 +08:00
/* Now indirect via that value!
*/
status = target_read_memory ( new_so - > som_solib . tsd_start_addr , buf , 4 ) ;
new_so - > som_solib . tsd_start_addr = extract_unsigned_integer ( buf , 4 ) ;
if ( status ! = 0 )
1999-07-08 04:19:36 +08:00
goto err ;
1999-04-16 09:35:26 +08:00
# ifdef SOLIB_DEBUG
1999-07-08 04:19:36 +08:00
printf ( " \n + library \" %s \" is described at 0x%x \n " , name , addr ) ;
printf ( " 'version' is %d \n " , new_so - > som_solib . struct_version ) ;
printf ( " 'bind_mode' is %d \n " , new_so - > som_solib . bind_mode ) ;
printf ( " 'library_version' is %d \n " , new_so - > som_solib . library_version ) ;
printf ( " 'text_addr' is 0x%x \n " , new_so - > som_solib . text_addr ) ;
printf ( " 'text_link_addr' is 0x%x \n " , new_so - > som_solib . text_link_addr ) ;
printf ( " 'text_end' is 0x%x \n " , new_so - > som_solib . text_end ) ;
printf ( " 'data_start' is 0x%x \n " , new_so - > som_solib . data_start ) ;
printf ( " 'bss_start' is 0x%x \n " , new_so - > som_solib . bss_start ) ;
printf ( " 'data_end' is 0x%x \n " , new_so - > som_solib . data_end ) ;
printf ( " 'got_value' is %x \n " , new_so - > som_solib . got_value ) ;
printf ( " 'next' is 0x%x \n " , new_so - > som_solib . next ) ;
printf ( " 'tsd_start_addr' is 0x%x \n " , new_so - > som_solib . tsd_start_addr ) ;
1999-04-16 09:35:26 +08:00
# endif
/* Go on to the next shared library descriptor.
*/
1999-07-08 04:19:36 +08:00
addr = ( CORE_ADDR ) new_so - > som_solib . next ;
1999-04-16 09:35:26 +08:00
/* At this point, we have essentially hooked the shlib into the
" info share " command . However , we haven ' t yet loaded its
symbol table . We must now decide whether we ought to , i . e . ,
whether doing so would exceed the symbol table size threshold .
If the threshold has just now been exceeded , then we ' ll issue
a warning message ( which explains how to load symbols manually ,
if the user so desires ) .
If the threshold has just now or previously been exceeded ,
we ' ll just add the shlib to the list of object files , but won ' t
actually load its symbols . ( This is more useful than it might
sound , for it allows us to e . g . , still load and use the shlibs '
unwind information for stack tracebacks . )
1999-07-08 04:19:36 +08:00
*/
1999-04-16 09:35:26 +08:00
/* Note that we DON'T want to preclude the user from using the
add - symbol - file command ! Thus , we only worry about the threshold
when we ' re invoked for other reasons .
1999-07-08 04:19:36 +08:00
*/
1999-04-16 09:35:26 +08:00
st_size = som_solib_sizeof_symbol_table ( name ) ;
som_solib_st_size_threshold_exceeded =
1999-07-08 04:19:36 +08:00
! from_tty & &
2001-12-21 07:40:15 +08:00
auto_solib_limit > 0 & &
2001-11-02 00:17:08 +08:00
readsyms & &
2001-10-31 01:34:30 +08:00
( ( st_size + som_solib_total_st_size ) > ( auto_solib_limit * ( LONGEST ) ( 1024 * 1024 ) ) ) ;
1999-04-16 09:35:26 +08:00
if ( som_solib_st_size_threshold_exceeded )
1999-07-08 04:19:36 +08:00
{
if ( ! threshold_warning_given )
2001-10-30 12:05:36 +08:00
warning ( " Symbols for some libraries have not been loaded, because \n doing so would exceed the size threshold specified by auto-solib-limit. \n To manually load symbols, use the 'sharedlibrary' command. \n To raise the threshold, set auto-solib-limit to a larger value and rerun \n the program. \n " ) ;
1999-07-08 04:19:36 +08:00
threshold_warning_given = 1 ;
/* We'll still make note of this shlib, even if we don't
read its symbols . This allows us to use its unwind
information well enough to know how to e . g . , correctly
do a traceback from a PC within the shlib , even if we
can ' t symbolize those PCs . . .
*/
som_solib_add_solib_objfile ( new_so , name , from_tty , text_addr ) ;
continue ;
}
1999-04-16 09:35:26 +08:00
som_solib_total_st_size + = st_size ;
/* This fills in new_so->objfile, among others. */
som_solib_load_symbols ( new_so , name , from_tty , text_addr , target ) ;
}
# ifdef SOLIB_DEBUG
1999-07-08 04:19:36 +08:00
printf ( " --Done reading shared library data \n " ) ;
1999-04-16 09:35:26 +08:00
# endif
/* Getting new symbols may change our opinion about what is
frameless . */
reinit_frame_cache ( ) ;
return ;
old_dld :
error ( " Debugging dynamic executables loaded via the hpux8 dld.sl is not supported. \n " ) ;
return ;
err :
error ( " Error while reading dynamic library list. \n " ) ;
return ;
}
/* This hook gets called just before the first instruction in the
inferior process is executed .
This is our opportunity to set magic flags in the inferior so
that GDB can be notified when a shared library is mapped in and
to tell the dynamic linker that a private copy of the library is
needed ( so GDB can set breakpoints in the library ) .
__dld_flags is the location of the magic flags ; as of this implementation
there are 3 flags of interest :
bit 0 when set indicates that private copies of the libraries are needed
bit 1 when set indicates that the callback hook routine is valid
bit 2 when set indicates that the dynamic linker should maintain the
1999-07-08 04:19:36 +08:00
__dld_list structure when loading / unloading libraries .
1999-04-16 09:35:26 +08:00
Note that shared libraries are not mapped in at this time , so we have
run the inferior until the libraries are mapped in . Typically this
means running until the " _start " is called . */
void
2000-07-30 09:48:28 +08:00
som_solib_create_inferior_hook ( void )
1999-04-16 09:35:26 +08:00
{
struct minimal_symbol * msymbol ;
unsigned int dld_flags , status , have_endo ;
asection * shlib_info ;
char buf [ 4 ] ;
struct objfile * objfile ;
CORE_ADDR anaddr ;
/* First, remove all the solib event breakpoints. Their addresses
may have changed since the last time we ran the program . */
remove_solib_event_breakpoints ( ) ;
if ( symfile_objfile = = NULL )
1999-07-08 04:19:36 +08:00
return ;
1999-04-16 09:35:26 +08:00
/* First see if the objfile was dynamically linked. */
shlib_info = bfd_get_section_by_name ( symfile_objfile - > obfd , " $SHLIB_INFO$ " ) ;
if ( ! shlib_info )
return ;
/* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
if ( bfd_section_size ( symfile_objfile - > obfd , shlib_info ) = = 0 )
return ;
have_endo = 0 ;
2001-12-21 07:40:15 +08:00
/* Slam the pid of the process into __d_pid.
We used to warn when this failed , but that warning is only useful
on very old HP systems ( hpux9 and older ) . The warnings are an
annoyance to users of modern systems and foul up the testsuite as
well . As a result , the warnings have been disabled . */
1999-04-16 09:35:26 +08:00
msymbol = lookup_minimal_symbol ( " __d_pid " , NULL , symfile_objfile ) ;
if ( msymbol = = NULL )
2001-12-21 07:40:15 +08:00
goto keep_going ;
1999-04-16 09:35:26 +08:00
anaddr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
2001-05-04 12:15:33 +08:00
store_unsigned_integer ( buf , 4 , PIDGET ( inferior_ptid ) ) ;
1999-04-16 09:35:26 +08:00
status = target_write_memory ( anaddr , buf , 4 ) ;
if ( status ! = 0 )
{
warning ( " Unable to write __d_pid " ) ;
warning ( " Suggest linking with /opt/langtools/lib/end.o. " ) ;
warning ( " GDB will be unable to track shl_load/shl_unload calls " ) ;
goto keep_going ;
}
/* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook;
This will force the dynamic linker to call __d_trap when significant
events occur .
Note that the above is the pre - HP - UX 9.0 behaviour . At 9.0 and above ,
the dld provides an export stub named " __d_trap " as well as the
function named " __d_trap " itself , but doesn ' t provide " _DLD_HOOK " .
We ' ll look first for the old flavor and then the new .
1999-07-08 04:19:36 +08:00
*/
1999-04-16 09:35:26 +08:00
msymbol = lookup_minimal_symbol ( " _DLD_HOOK " , NULL , symfile_objfile ) ;
if ( msymbol = = NULL )
1999-07-08 04:19:36 +08:00
msymbol = lookup_minimal_symbol ( " __d_trap " , NULL , symfile_objfile ) ;
1999-04-16 09:35:26 +08:00
if ( msymbol = = NULL )
{
warning ( " Unable to find _DLD_HOOK symbol in object file. " ) ;
warning ( " Suggest linking with /opt/langtools/lib/end.o. " ) ;
warning ( " GDB will be unable to track shl_load/shl_unload calls " ) ;
goto keep_going ;
}
anaddr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
dld_cache . hook . address = anaddr ;
/* Grrr, this might not be an export symbol! We have to find the
export stub . */
ALL_OBJFILES ( objfile )
1999-07-08 04:19:36 +08:00
{
struct unwind_table_entry * u ;
struct minimal_symbol * msymbol2 ;
/* What a crock. */
msymbol2 = lookup_minimal_symbol_solib_trampoline ( SYMBOL_NAME ( msymbol ) ,
NULL , objfile ) ;
/* Found a symbol with the right name. */
if ( msymbol2 )
{
struct unwind_table_entry * u ;
/* It must be a shared library trampoline. */
if ( SYMBOL_TYPE ( msymbol2 ) ! = mst_solib_trampoline )
continue ;
/* It must also be an export stub. */
u = find_unwind_entry ( SYMBOL_VALUE ( msymbol2 ) ) ;
if ( ! u | | u - > stub_unwind . stub_type ! = EXPORT )
continue ;
/* OK. Looks like the correct import stub. */
anaddr = SYMBOL_VALUE ( msymbol2 ) ;
dld_cache . hook_stub . address = anaddr ;
}
}
1999-04-16 09:35:26 +08:00
store_unsigned_integer ( buf , 4 , anaddr ) ;
msymbol = lookup_minimal_symbol ( " __dld_hook " , NULL , symfile_objfile ) ;
if ( msymbol = = NULL )
{
warning ( " Unable to find __dld_hook symbol in object file. " ) ;
warning ( " Suggest linking with /opt/langtools/lib/end.o. " ) ;
warning ( " GDB will be unable to track shl_load/shl_unload calls " ) ;
goto keep_going ;
}
anaddr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
status = target_write_memory ( anaddr , buf , 4 ) ;
1999-07-08 04:19:36 +08:00
1999-04-16 09:35:26 +08:00
/* Now set a shlib_event breakpoint at __d_trap so we can track
significant shared library events . */
msymbol = lookup_minimal_symbol ( " __d_trap " , NULL , symfile_objfile ) ;
if ( msymbol = = NULL )
{
warning ( " Unable to find __dld_d_trap symbol in object file. " ) ;
warning ( " Suggest linking with /opt/langtools/lib/end.o. " ) ;
warning ( " GDB will be unable to track shl_load/shl_unload calls " ) ;
goto keep_going ;
}
create_solib_event_breakpoint ( SYMBOL_VALUE_ADDRESS ( msymbol ) ) ;
/* We have all the support usually found in end.o, so we can track
shl_load and shl_unload calls . */
have_endo = 1 ;
keep_going :
/* Get the address of __dld_flags, if no such symbol exists, then we can
not debug the shared code . */
msymbol = lookup_minimal_symbol ( " __dld_flags " , NULL , NULL ) ;
if ( msymbol = = NULL )
{
error ( " Unable to find __dld_flags symbol in object file. \n " ) ;
}
anaddr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
/* Read the current contents. */
status = target_read_memory ( anaddr , buf , 4 ) ;
if ( status ! = 0 )
{
error ( " Unable to read __dld_flags \n " ) ;
}
dld_flags = extract_unsigned_integer ( buf , 4 ) ;
/* Turn on the flags we care about. */
dld_flags | = DLD_FLAGS_MAPPRIVATE ;
if ( have_endo )
dld_flags | = DLD_FLAGS_HOOKVALID ;
store_unsigned_integer ( buf , 4 , dld_flags ) ;
status = target_write_memory ( anaddr , buf , 4 ) ;
if ( status ! = 0 )
{
error ( " Unable to write __dld_flags \n " ) ;
}
/* Now find the address of _start and set a breakpoint there.
We still need this code for two reasons :
1999-07-08 04:19:36 +08:00
* Not all sites have / opt / langtools / lib / end . o , so it ' s not always
possible to track the dynamic linker ' s events .
* At this time no events are triggered for shared libraries
loaded at startup time ( what a crock ) . */
1999-04-16 09:35:26 +08:00
msymbol = lookup_minimal_symbol ( " _start " , NULL , symfile_objfile ) ;
if ( msymbol = = NULL )
{
error ( " Unable to find _start symbol in object file. \n " ) ;
}
anaddr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
/* Make the breakpoint at "_start" a shared library event breakpoint. */
create_solib_event_breakpoint ( anaddr ) ;
/* Wipe out all knowledge of old shared libraries since their
mapping can change from one exec to another ! */
while ( so_list_head )
{
struct so_list * temp ;
temp = so_list_head ;
2000-12-15 09:01:51 +08:00
xfree ( so_list_head ) ;
1999-04-16 09:35:26 +08:00
so_list_head = temp - > next ;
}
clear_symtab_users ( ) ;
}
/* This operation removes the "hook" between GDB and the dynamic linker,
which causes the dld to notify GDB of shared library events .
After this operation completes , the dld will no longer notify GDB of
shared library events . To resume notifications , GDB must call
som_solib_create_inferior_hook .
This operation does not remove any knowledge of shared libraries which
GDB may already have been notified of .
1999-07-08 04:19:36 +08:00
*/
1999-04-16 09:35:26 +08:00
void
2000-07-30 09:48:28 +08:00
som_solib_remove_inferior_hook ( int pid )
1999-04-16 09:35:26 +08:00
{
1999-07-08 04:19:36 +08:00
CORE_ADDR addr ;
struct minimal_symbol * msymbol ;
int status ;
char dld_flags_buffer [ TARGET_INT_BIT / TARGET_CHAR_BIT ] ;
unsigned int dld_flags_value ;
2001-05-07 06:22:03 +08:00
struct cleanup * old_cleanups = save_inferior_ptid ( ) ;
1999-04-16 09:35:26 +08:00
/* Ensure that we're really operating on the specified process. */
2001-05-04 12:15:33 +08:00
inferior_ptid = pid_to_ptid ( pid ) ;
1999-04-16 09:35:26 +08:00
/* We won't bother to remove the solib breakpoints from this process.
In fact , on PA64 the breakpoint is hard - coded into the dld callback ,
and thus we ' re not supposed to remove it .
Rather , we ' ll merely clear the dld_flags bit that enables callbacks .
1999-07-08 04:19:36 +08:00
*/
1999-04-16 09:35:26 +08:00
msymbol = lookup_minimal_symbol ( " __dld_flags " , NULL , NULL ) ;
addr = SYMBOL_VALUE_ADDRESS ( msymbol ) ;
1999-07-08 04:19:36 +08:00
status = target_read_memory ( addr , dld_flags_buffer , TARGET_INT_BIT / TARGET_CHAR_BIT ) ;
1999-04-16 09:35:26 +08:00
dld_flags_value = extract_unsigned_integer ( dld_flags_buffer ,
1999-07-08 04:19:36 +08:00
sizeof ( dld_flags_value ) ) ;
1999-04-16 09:35:26 +08:00
dld_flags_value & = ~ DLD_FLAGS_HOOKVALID ;
store_unsigned_integer ( dld_flags_buffer ,
1999-07-08 04:19:36 +08:00
sizeof ( dld_flags_value ) ,
dld_flags_value ) ;
status = target_write_memory ( addr , dld_flags_buffer , TARGET_INT_BIT / TARGET_CHAR_BIT ) ;
1999-04-16 09:35:26 +08:00
do_cleanups ( old_cleanups ) ;
}
/* This function creates a breakpoint on the dynamic linker hook, which
is called when e . g . , a shl_load or shl_unload call is made . This
breakpoint will only trigger when a shl_load call is made .
If filename is NULL , then loads of any dll will be caught . Else ,
only loads of the file whose pathname is the string contained by
filename will be caught .
Undefined behaviour is guaranteed if this function is called before
som_solib_create_inferior_hook .
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*/
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void
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som_solib_create_catch_load_hook ( int pid , int tempflag , char * filename ,
char * cond_string )
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{
create_solib_load_event_breakpoint ( " __d_trap " , tempflag , filename , cond_string ) ;
}
/* This function creates a breakpoint on the dynamic linker hook, which
is called when e . g . , a shl_load or shl_unload call is made . This
breakpoint will only trigger when a shl_unload call is made .
If filename is NULL , then unloads of any dll will be caught . Else ,
only unloads of the file whose pathname is the string contained by
filename will be caught .
Undefined behaviour is guaranteed if this function is called before
som_solib_create_inferior_hook .
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*/
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void
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som_solib_create_catch_unload_hook ( int pid , int tempflag , char * filename ,
char * cond_string )
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{
create_solib_unload_event_breakpoint ( " __d_trap " , tempflag , filename , cond_string ) ;
}
int
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som_solib_have_load_event ( int pid )
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{
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CORE_ADDR event_kind ;
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event_kind = read_register ( ARG0_REGNUM ) ;
return ( event_kind = = SHL_LOAD ) ;
}
int
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som_solib_have_unload_event ( int pid )
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{
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CORE_ADDR event_kind ;
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event_kind = read_register ( ARG0_REGNUM ) ;
return ( event_kind = = SHL_UNLOAD ) ;
}
static char *
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som_solib_library_pathname ( int pid )
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{
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CORE_ADDR dll_handle_address ;
CORE_ADDR dll_pathname_address ;
struct som_solib_mapped_entry dll_descriptor ;
char * p ;
static char dll_pathname [ 1024 ] ;
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/* Read the descriptor of this newly-loaded library. */
dll_handle_address = read_register ( ARG1_REGNUM ) ;
read_memory ( dll_handle_address , ( char * ) & dll_descriptor , sizeof ( dll_descriptor ) ) ;
/* We can find a pointer to the dll's pathname within the descriptor. */
dll_pathname_address = ( CORE_ADDR ) dll_descriptor . name ;
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/* Read the pathname, one byte at a time. */
p = dll_pathname ;
for ( ; ; )
{
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char b ;
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read_memory ( dll_pathname_address + + , ( char * ) & b , 1 ) ;
* p + + = b ;
if ( b = = ' \0 ' )
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break ;
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}
return dll_pathname ;
}
char *
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som_solib_loaded_library_pathname ( int pid )
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{
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if ( ! som_solib_have_load_event ( pid ) )
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error ( " Must have a load event to use this query " ) ;
return som_solib_library_pathname ( pid ) ;
}
char *
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som_solib_unloaded_library_pathname ( int pid )
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{
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if ( ! som_solib_have_unload_event ( pid ) )
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error ( " Must have an unload event to use this query " ) ;
return som_solib_library_pathname ( pid ) ;
}
static void
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som_solib_desire_dynamic_linker_symbols ( void )
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{
struct objfile * objfile ;
struct unwind_table_entry * u ;
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struct minimal_symbol * dld_msymbol ;
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/* Do we already know the value of these symbols? If so, then
we ' ve no work to do .
( If you add clauses to this test , be sure to likewise update the
test within the loop . )
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*/
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if ( dld_cache . is_valid )
return ;
ALL_OBJFILES ( objfile )
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{
dld_msymbol = lookup_minimal_symbol ( " shl_load " , NULL , objfile ) ;
if ( dld_msymbol ! = NULL )
{
dld_cache . load . address = SYMBOL_VALUE ( dld_msymbol ) ;
dld_cache . load . unwind = find_unwind_entry ( dld_cache . load . address ) ;
}
dld_msymbol = lookup_minimal_symbol_solib_trampoline ( " shl_load " ,
NULL ,
objfile ) ;
if ( dld_msymbol ! = NULL )
{
if ( SYMBOL_TYPE ( dld_msymbol ) = = mst_solib_trampoline )
{
u = find_unwind_entry ( SYMBOL_VALUE ( dld_msymbol ) ) ;
if ( ( u ! = NULL ) & & ( u - > stub_unwind . stub_type = = EXPORT ) )
{
dld_cache . load_stub . address = SYMBOL_VALUE ( dld_msymbol ) ;
dld_cache . load_stub . unwind = u ;
}
}
}
dld_msymbol = lookup_minimal_symbol ( " shl_unload " , NULL , objfile ) ;
if ( dld_msymbol ! = NULL )
{
dld_cache . unload . address = SYMBOL_VALUE ( dld_msymbol ) ;
dld_cache . unload . unwind = find_unwind_entry ( dld_cache . unload . address ) ;
/* ??rehrauer: I'm not sure exactly what this is, but it appears
that on some HPUX 10. x versions , there ' s two unwind regions to
cover the body of " shl_unload " , the second being 4 bytes past
the end of the first . This is a large hack to handle that
case , but since I don ' t seem to have any legitimate way to
look for this thing via the symbol table . . .
*/
if ( dld_cache . unload . unwind ! = NULL )
{
u = find_unwind_entry ( dld_cache . unload . unwind - > region_end + 4 ) ;
if ( u ! = NULL )
{
dld_cache . unload2 . address = u - > region_start ;
dld_cache . unload2 . unwind = u ;
}
}
}
dld_msymbol = lookup_minimal_symbol_solib_trampoline ( " shl_unload " ,
NULL ,
objfile ) ;
if ( dld_msymbol ! = NULL )
{
if ( SYMBOL_TYPE ( dld_msymbol ) = = mst_solib_trampoline )
{
u = find_unwind_entry ( SYMBOL_VALUE ( dld_msymbol ) ) ;
if ( ( u ! = NULL ) & & ( u - > stub_unwind . stub_type = = EXPORT ) )
{
dld_cache . unload_stub . address = SYMBOL_VALUE ( dld_msymbol ) ;
dld_cache . unload_stub . unwind = u ;
}
}
}
/* Did we find everything we were looking for? If so, stop. */
2001-10-24 09:19:12 +08:00
if ( ( dld_cache . load . address ! = 0 )
& & ( dld_cache . load_stub . address ! = 0 )
& & ( dld_cache . unload . address ! = 0 )
& & ( dld_cache . unload_stub . address ! = 0 ) )
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{
dld_cache . is_valid = 1 ;
break ;
}
}
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dld_cache . hook . unwind = find_unwind_entry ( dld_cache . hook . address ) ;
dld_cache . hook_stub . unwind = find_unwind_entry ( dld_cache . hook_stub . address ) ;
/* We're prepared not to find some of these symbols, which is why
this function is a " desire " operation , and not a " require " .
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*/
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}
int
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som_solib_in_dynamic_linker ( int pid , CORE_ADDR pc )
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{
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struct unwind_table_entry * u_pc ;
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/* Are we in the dld itself?
? ? rehrauer : Large hack - - We ' ll assume that any address in a
shared text region is the dld ' s text . This would obviously
fall down if the user attached to a process , whose shlibs
weren ' t mapped to a ( writeable ) private region . However , in
that case the debugger probably isn ' t able to set the fundamental
breakpoint in the dld callback anyways , so this hack should be
safe .
1999-07-08 04:19:36 +08:00
*/
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if ( ( pc & ( CORE_ADDR ) 0xc0000000 ) = = ( CORE_ADDR ) 0xc0000000 )
return 1 ;
/* Cache the address of some symbols that are part of the dynamic
linker , if not already known .
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*/
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som_solib_desire_dynamic_linker_symbols ( ) ;
/* Are we in the dld callback? Or its export stub? */
u_pc = find_unwind_entry ( pc ) ;
if ( u_pc = = NULL )
return 0 ;
if ( ( u_pc = = dld_cache . hook . unwind ) | | ( u_pc = = dld_cache . hook_stub . unwind ) )
return 1 ;
/* Or the interface of the dld (i.e., "shl_load" or friends)? */
if ( ( u_pc = = dld_cache . load . unwind )
| | ( u_pc = = dld_cache . unload . unwind )
| | ( u_pc = = dld_cache . unload2 . unwind )
| | ( u_pc = = dld_cache . load_stub . unwind )
| | ( u_pc = = dld_cache . unload_stub . unwind ) )
return 1 ;
/* Apparently this address isn't part of the dld's text. */
return 0 ;
}
/* Return the GOT value for the shared library in which ADDR belongs. If
ADDR isn ' t in any known shared library , return zero . */
CORE_ADDR
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som_solib_get_got_by_pc ( CORE_ADDR addr )
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{
struct so_list * so_list = so_list_head ;
CORE_ADDR got_value = 0 ;
while ( so_list )
{
if ( so_list - > som_solib . text_addr < = addr
& & so_list - > som_solib . text_end > addr )
{
got_value = so_list - > som_solib . got_value ;
break ;
}
so_list = so_list - > next ;
}
return got_value ;
}
/* elz:
Return the address of the handle of the shared library
in which ADDR belongs . If
ADDR isn ' t in any known shared library , return zero . */
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/* this function is used in hppa_fix_call_dummy in hppa-tdep.c */
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CORE_ADDR
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som_solib_get_solib_by_pc ( CORE_ADDR addr )
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{
struct so_list * so_list = so_list_head ;
while ( so_list )
{
if ( so_list - > som_solib . text_addr < = addr
& & so_list - > som_solib . text_end > addr )
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{
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break ;
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}
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so_list = so_list - > next ;
}
if ( so_list )
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return so_list - > solib_addr ;
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else
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return 0 ;
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}
int
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som_solib_section_offsets ( struct objfile * objfile ,
struct section_offsets * offsets )
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{
struct so_list * so_list = so_list_head ;
while ( so_list )
{
/* Oh what a pain! We need the offsets before so_list->objfile
1999-07-08 04:19:36 +08:00
is valid . The BFDs will never match . Make a best guess . */
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if ( strstr ( objfile - > name , so_list - > som_solib . name ) )
{
asection * private_section ;
/* The text offset is easy. */
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offsets - > offsets [ SECT_OFF_TEXT ( objfile ) ]
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= ( so_list - > som_solib . text_addr
- so_list - > som_solib . text_link_addr ) ;
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offsets - > offsets [ SECT_OFF_RODATA ( objfile ) ]
Elena Zannoni <ezannoni@kwikemart.cygnus.com>
* objfiles.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Define as functions of OBJFILE. Add
sect_index_text, sect_index_data, sect_index_rodata,
sect_index_bss to objfile structure.
* gdb-stabs.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Remove.
* objfiles.c (allocate_objfile): Initialize
sect_index_{text,data,bss,rodata} to -1, for error detection.
* symfile.c (default_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata} from bfd information.
* xcoffread.c (xcoff_symfile_offsets): Ditto.
* somread.c (som_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata}.
* coffread.c, dbxread.c, elfread.c, hp-psymtab-read.c,
hp-symtab-read.c, hpread.c, mdebugread.c, minsyms.c,
mipsread.c, objfiles.c, os9kread.c, pa64solib.c, partial-stab.h,
remote-os9k.c, remote-vx.c, remote.c, rs6000-nat.c, somsolib.c,
stabsread.c, symfile.c, xcoffread.c:
Update use of SECT_OFF_{TEXT,DATA,BSS,RODATA} to depend on the
current objfile.
* xcoffread.c: Add new field objfile to find_targ_sec_arg.
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= ANOFFSET ( offsets , SECT_OFF_TEXT ( objfile ) ) ;
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/* We should look at presumed_dp in the SOM header, but
that ' s not easily available . This should be OK though . */
private_section = bfd_get_section_by_name ( objfile - > obfd ,
" $PRIVATE$ " ) ;
if ( ! private_section )
{
warning ( " Unable to find $PRIVATE$ in shared library! " ) ;
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offsets - > offsets [ SECT_OFF_DATA ( objfile ) ] = 0 ;
offsets - > offsets [ SECT_OFF_BSS ( objfile ) ] = 0 ;
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return 1 ;
}
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offsets - > offsets [ SECT_OFF_DATA ( objfile ) ]
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= ( so_list - > som_solib . data_start - private_section - > vma ) ;
2000-08-28 06:30:29 +08:00
offsets - > offsets [ SECT_OFF_BSS ( objfile ) ]
Elena Zannoni <ezannoni@kwikemart.cygnus.com>
* objfiles.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Define as functions of OBJFILE. Add
sect_index_text, sect_index_data, sect_index_rodata,
sect_index_bss to objfile structure.
* gdb-stabs.h (SECT_OFF_DATA, SECT_OFF_TEXT, SECT_OFF_BSS,
SECT_OFF_RODATA): Remove.
* objfiles.c (allocate_objfile): Initialize
sect_index_{text,data,bss,rodata} to -1, for error detection.
* symfile.c (default_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata} from bfd information.
* xcoffread.c (xcoff_symfile_offsets): Ditto.
* somread.c (som_symfile_offsets): Initialize
sect_index_{text,data,bss,rodata}.
* coffread.c, dbxread.c, elfread.c, hp-psymtab-read.c,
hp-symtab-read.c, hpread.c, mdebugread.c, minsyms.c,
mipsread.c, objfiles.c, os9kread.c, pa64solib.c, partial-stab.h,
remote-os9k.c, remote-vx.c, remote.c, rs6000-nat.c, somsolib.c,
stabsread.c, symfile.c, xcoffread.c:
Update use of SECT_OFF_{TEXT,DATA,BSS,RODATA} to depend on the
current objfile.
* xcoffread.c: Add new field objfile to find_targ_sec_arg.
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= ANOFFSET ( offsets , SECT_OFF_DATA ( objfile ) ) ;
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return 1 ;
}
so_list = so_list - > next ;
}
return 0 ;
}
/* Dump information about all the currently loaded shared libraries. */
static void
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som_sharedlibrary_info_command ( char * ignore , int from_tty )
1999-04-16 09:35:26 +08:00
{
struct so_list * so_list = so_list_head ;
if ( exec_bfd = = NULL )
{
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printf_unfiltered ( " No executable file. \n " ) ;
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return ;
}
if ( so_list = = NULL )
{
printf_unfiltered ( " No shared libraries loaded at this time. \n " ) ;
return ;
}
printf_unfiltered ( " Shared Object Libraries \n " ) ;
printf_unfiltered ( " %-12s%-12s%-12s%-12s%-12s%-12s \n " ,
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" flags " , " tstart " , " tend " , " dstart " , " dend " , " dlt " ) ;
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while ( so_list )
{
unsigned int flags ;
flags = so_list - > som_solib . struct_version < < 24 ;
flags | = so_list - > som_solib . bind_mode < < 16 ;
flags | = so_list - > som_solib . library_version ;
printf_unfiltered ( " %s " , so_list - > som_solib . name ) ;
if ( so_list - > objfile = = NULL )
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printf_unfiltered ( " (symbols not loaded) " ) ;
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printf_unfiltered ( " \n " ) ;
printf_unfiltered ( " %-12s " , local_hex_string_custom ( flags , " 08l " ) ) ;
printf_unfiltered ( " %-12s " ,
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local_hex_string_custom ( so_list - > som_solib . text_addr , " 08l " ) ) ;
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printf_unfiltered ( " %-12s " ,
local_hex_string_custom ( so_list - > som_solib . text_end , " 08l " ) ) ;
printf_unfiltered ( " %-12s " ,
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local_hex_string_custom ( so_list - > som_solib . data_start , " 08l " ) ) ;
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printf_unfiltered ( " %-12s " ,
local_hex_string_custom ( so_list - > som_solib . data_end , " 08l " ) ) ;
printf_unfiltered ( " %-12s \n " ,
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local_hex_string_custom ( so_list - > som_solib . got_value , " 08l " ) ) ;
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so_list = so_list - > next ;
}
}
static void
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som_solib_sharedlibrary_command ( char * args , int from_tty )
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{
dont_repeat ( ) ;
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som_solib_add ( args , from_tty , ( struct target_ops * ) 0 , 1 ) ;
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}
char *
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som_solib_address ( CORE_ADDR addr )
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{
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struct so_list * so = so_list_head ;
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while ( so )
{
/* Is this address within this shlib's text range? If so,
return the shlib ' s name .
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*/
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if ( ( addr > = so - > som_solib . text_addr ) & & ( addr < = so - > som_solib . text_end ) )
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return so - > som_solib . name ;
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/* Nope, keep looking... */
so = so - > next ;
}
/* No, we couldn't prove that the address is within a shlib. */
return NULL ;
}
void
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som_solib_restart ( void )
1999-04-16 09:35:26 +08:00
{
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struct so_list * sl = so_list_head ;
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/* Before the shlib info vanishes, use it to disable any breakpoints
that may still be active in those shlibs .
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*/
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disable_breakpoints_in_shlibs ( 0 ) ;
/* Discard all the shlib descriptors.
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*/
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while ( sl )
{
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struct so_list * next_sl = sl - > next ;
2000-12-15 09:01:51 +08:00
xfree ( sl ) ;
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sl = next_sl ;
}
so_list_head = NULL ;
som_solib_total_st_size = ( LONGEST ) 0 ;
som_solib_st_size_threshold_exceeded = 0 ;
dld_cache . is_valid = 0 ;
dld_cache . hook . address = 0 ;
dld_cache . hook . unwind = NULL ;
dld_cache . hook_stub . address = 0 ;
dld_cache . hook_stub . unwind = NULL ;
dld_cache . load . address = 0 ;
dld_cache . load . unwind = NULL ;
dld_cache . load_stub . address = 0 ;
dld_cache . load_stub . unwind = NULL ;
dld_cache . unload . address = 0 ;
dld_cache . unload . unwind = NULL ;
dld_cache . unload2 . address = 0 ;
dld_cache . unload2 . unwind = NULL ;
dld_cache . unload_stub . address = 0 ;
dld_cache . unload_stub . unwind = NULL ;
}
2001-07-19 12:58:17 +08:00
/* LOCAL FUNCTION
no_shared_libraries - - handle command to explicitly discard symbols
from shared libraries .
DESCRIPTION
Implements the command " nosharedlibrary " , which discards symbols
that have been auto - loaded from shared libraries . Symbols from
shared libraries that were added by explicit request of the user
are not discarded . Also called from remote . c . */
void
no_shared_libraries ( char * ignored , int from_tty )
{
/* FIXME */
}
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void
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_initialize_som_solib ( void )
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{
add_com ( " sharedlibrary " , class_files , som_solib_sharedlibrary_command ,
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" Load shared object library symbols for files matching REGEXP. " ) ;
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add_info ( " sharedlibrary " , som_sharedlibrary_info_command ,
" Status of loaded shared object libraries. " ) ;
2001-10-30 12:05:36 +08:00
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add_show_from_set
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( add_set_cmd ( " auto-solib-add " , class_support , var_boolean ,
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( char * ) & auto_solib_add ,
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" Set autoloading of shared library symbols. \n \
If \ " on \" , symbols from all shared object libraries will be loaded \n \
automatically when the inferior begins execution , when the dynamic linker \ n \
informs gdb that a new library has been loaded , or when attaching to the \ n \
inferior . Otherwise , symbols must be loaded manually , using ` sharedlibrary ' . " ,
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& setlist ) ,
& showlist ) ;
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add_show_from_set
( add_set_cmd ( " auto-solib-limit " , class_support , var_zinteger ,
( char * ) & auto_solib_limit ,
" Set threshold (in Mb) for autoloading shared library symbols. \n \
When shared library autoloading is enabled , new libraries will be loaded \ n \
only until the total size of shared library symbols exceeds this \ n \
threshold in megabytes . Is ignored when using ` sharedlibrary ' . " ,
& setlist ) ,
& showlist ) ;
/* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how
much data space a process can use . We ought to be reading
MAXDSIZ and setting auto_solib_limit to some large fraction of
that value . If not that , we maybe ought to be setting it smaller
than the default for MAXDSIZ ( that being 64 Mb , I believe ) .
However , [ 1 ] this threshold is only crudely approximated rather
than actually measured , and [ 2 ] 50 Mbytes is too small for
debugging gdb itself . Thus , the arbitrary 100 figure . */
auto_solib_limit = 100 ; /* Megabytes */
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som_solib_restart ( ) ;
}
/* Get some HPUX-specific data from a shared lib.
*/
CORE_ADDR
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so_lib_thread_start_addr ( struct so_list * so )
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{
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return so - > som_solib . tsd_start_addr ;
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}