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* Beginnings of SOM shared library support. Breakpoints and

Browse Source 
single frame backtracing within the library only.  Only works when
	using the HPUX 9 dynamic linker.  More functionality to be added
	soon.

	* somsolib.c, somsolib.h: New files.
	* Makefile.in (HFILES_NO_SRCDIR): Add somsolib.h
	(ALLDEPFILES): Add somsolib.c.
	(somsolib.o): Add some dependencies.
	* mpw-make.in (HFILES_NO_SRCDIR): Add somsolib.h
	(ALLDEPFILES): Add somsolib.c.
	(somsolib.o): Add some dependencies.
	* somread.c (som_symtab_read): Accept multiple section offsets.
	All callers changed.  Adjust all text symbols with the first
	section offset.
	* symfile.c (find_lowest_section): Enable this function.  Add some
	tie-breaking logic when sections have the same vma.
	(syms_from_objfile): Use find_lowest_section rather than looking
	for ".text" by name.  Relax warning to only warn if the lowest
	section is not a code section.
	* config/pa/{hppabsd.mh, hppahpux.mh} (NATDEPFILES): Add somsolib.o
	* config/pa/{nm-hppab.h, nm-hppah.h}: Include somsolib.h.
This commit is contained in:
Jeff Law 1994-11-07 07:51:47 +00:00
parent f4c01c9548
commit bb140953e4
11 changed files with 422 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
gdb/.Sanitize
View File

@ -271,6 +271,8 @@ signals.h
solib.c
solib.h
somread.c
somsolib.c
somsolib.h
source.c
sp64-tdep.c
sparc-nat.c

22
gdb/ChangeLog
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@ -1,3 +1,25 @@
Mon Nov 7 00:27:16 1994 Jeff Law (law@snake.cs.utah.edu)
* Beginnings of SOM shared library support. Breakpoints and
single frame backtracing within the library only. Only works when
using the HPUX 9 dynamic linker. More functionality to be added
soon.
* somsolib.c, somsolib.h: New files.
* Makefile.in (HFILES_NO_SRCDIR): Add somsolib.h
(ALLDEPFILES): Add somsolib.c.
(somsolib.o): Add some dependencies.
* somread.c (som_symtab_read): Accept multiple section offsets.
All callers changed. Adjust all text symbols with the first
section offset.
* symfile.c (find_lowest_section): Enable this function. Add some
tie-breaking logic when sections have the same vma.
(syms_from_objfile): Use find_lowest_section rather than looking
for ".text" by name. Relax warning to only warn if the lowest
section is not a code section.
* config/pa/{hppabsd.mh, hppahpux.mh} (NATDEPFILES): Add somsolib.o
* config/pa/{nm-hppab.h, nm-hppah.h}: Include somsolib.h.
Sun Nov 6 12:54:54 1994 Jeff Law (law@snake.cs.utah.edu)
* partial-stab.h (N_TEXT): Put back GDB_TARGET_IS_HPPA kludge,

6
gdb/ChangeLog.mpw
View File

@ -1,3 +1,9 @@
Mon Nov 7 00:46:22 1994 Jeff Law (law@snake.cs.utah.edu)
* mpw-make.in (HFILES_NO_SRCDIR): Add somsolib.h
(ALLDEPFILES): Add somsolib.c.
(somsolib.o): Add some dependencies.
Mon Sep 12 17:44:58 1994 Stan Shebs (shebs@andros.cygnus.com)
* mpw-config.in: Use nm-empty.h if host is not target.

2
gdb/config/pa/hppabsd.mh
View File

@ -6,4 +6,4 @@ HPREAD=hpread.o
XDEPFILES=
XM_FILE= xm-hppab.h
NAT_FILE= nm-hppab.h
NATDEPFILES= hppab-nat.o coredep.o corelow.o inftarg.o fork-child.o somread.o infptrace.o $(HPREAD)
NATDEPFILES= hppab-nat.o coredep.o corelow.o inftarg.o fork-child.o somread.o infptrace.o $(HPREAD) somsolib.o

2
gdb/config/pa/hppahpux.mh
View File

@ -10,6 +10,6 @@ XM_FILE= xm-hppah.h
XDEPFILES= ser-tcp.o
NAT_FILE= nm-hppah.h
NATDEPFILES= hppah-nat.o coredep.o corelow.o inftarg.o fork-child.o somread.o infptrace.o $(HPREAD)
NATDEPFILES= hppah-nat.o coredep.o corelow.o inftarg.o fork-child.o somread.o infptrace.o $(HPREAD) somsolib.o
HOST_IPC=-DBSD_IPC -DPOSIX_WAIT

2
gdb/config/pa/nm-hppab.h
View File

@ -17,6 +17,8 @@ You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "somsolib.h"
#define U_REGS_OFFSET 0
#define KERNEL_U_ADDR 0

2
gdb/config/pa/nm-hppah.h
View File

@ -17,6 +17,8 @@ You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "somsolib.h"
#define U_REGS_OFFSET 0
#define KERNEL_U_ADDR 0

7
gdb/mpw-make.in
View File

@ -345,7 +345,8 @@ ALLDEPFILES = "{s}"29k-share:udi:udip2soc.c "{s}"29k-share:udi:udr.c \Option-d
"{s}"nindy-share:Onindy.c "{s}"nindy-share:nindy.c \Option-d
"{s}"nindy-share:ttyflush.c "{s}"nindy-tdep.c \Option-d
"{s}"ns32k-pinsn.c "{s}"ns32km3-nat.c "{s}"osfsolib.c \Option-d
"{s}"somread.c "{s}"procfs.c "{s}"pyr-pinsn.c "{s}"pyr-tdep.c "{s}"pyr-xdep.c \Option-d
"{s}"somread.c "{s}"somsolib.c \
"{s}"procfs.c "{s}"pyr-pinsn.c "{s}"pyr-tdep.c "{s}"pyr-xdep.c \Option-d
"{s}"remote-adapt.c "{s}"remote-bug.c "{s}"remote-e7000.c "{s}"remote-eb.c "{s}"remote-es.c \Option-d
"{s}"remote-hms.c "{s}"remote-mips.c \Option-d
"{s}"remote-mm.c "{s}"remote-mon.c "{s}"remote-nindy.c "{s}"remote-sim.c \Option-d
@ -606,7 +607,7 @@ HFILES_NO_SRCDIR = "{s}"buildsym.h "{s}"call-cmds.h "{s}"coff-solib.h "{s}"defs.
"{s}"vx-share:dbgRpcLib.h "{s}"vx-share:ptrace.h "{s}"vx-share:vxTypes.h \Option-d
"{s}"vx-share:vxWorks.h "{s}"vx-share:wait.h "{s}"vx-share:xdr_ld.h \Option-d
"{s}"vx-share:xdr_ptrace.h "{s}"vx-share:xdr_rdb.h "{s}"thread.h \Option-d
"{s}"dcache.h "{s}"remote-utils.h "{s}"remote-sim.h
"{s}"dcache.h "{s}"remote-utils.h "{s}"remote-sim.h "{s}"somsolib.h
# Header files that already have srcdir in them.
@ -1364,6 +1365,8 @@ MAKEOVERRIDES=
"{o}"somread.c.o \Option-f "{s}"somread.c {bfd_h} "{s}"buildsym.h "{s}"complaints.h {defs_h} \Option-d
"{s}"gdb-stabs.h "{s}"objfiles.h "{s}"symfile.h {symtab_h}
"{o}"somsolib.c.o \Option-f "{s}"somsolib.c {defs_h}
"{o}"parse.c.o \Option-f "{s}"parse.c {command_h} {defs_h} {expression_h} {frame_h} \Option-d
{gdbtypes_h} "{s}"language.h "{s}"parser-defs.h {symtab_h} {value_h}

30
gdb/somread.c
View File

@ -49,7 +49,8 @@ static void
som_symfile_finish PARAMS ((struct objfile *));
static void
som_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
som_symtab_read PARAMS ((bfd *, struct objfile *,
struct section_offsets *));
static struct section_offsets *
som_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
@ -78,8 +79,8 @@ LOCAL FUNCTION
SYNOPSIS
void som_symtab_read (bfd *abfd, CORE_ADDR addr,
struct objfile *objfile)
void som_symtab_read (bfd *abfd, struct objfile *objfile,
struct section_offsets *section_offsets)
DESCRIPTION
@ -90,10 +91,10 @@ DESCRIPTION
*/
static void
som_symtab_read (abfd, addr, objfile)
som_symtab_read (abfd, objfile, section_offsets)
bfd *abfd;
CORE_ADDR addr;
struct objfile *objfile;
struct section_offsets *section_offsets;
{
unsigned int number_of_symbols;
int val, dynamic;
@ -102,6 +103,11 @@ som_symtab_read (abfd, addr, objfile)
struct symbol_dictionary_record *buf, *bufp, *endbufp;
char *symname;
CONST int symsize = sizeof (struct symbol_dictionary_record);
CORE_ADDR text_offset;
/* FIXME. Data stuff needs dynamic relocation too! */
text_offset = ANOFFSET (section_offsets, 0);
number_of_symbols = bfd_get_symcount (abfd);
@ -152,6 +158,7 @@ som_symtab_read (abfd, addr, objfile)
case ST_MILLICODE:
symname = bufp->name.n_strx + stringtab;
ms_type = mst_text;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -166,6 +173,7 @@ som_symtab_read (abfd, addr, objfile)
ms_type = mst_solib_trampoline;
else
ms_type = mst_text;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -174,6 +182,7 @@ som_symtab_read (abfd, addr, objfile)
case ST_STUB:
symname = bufp->name.n_strx + stringtab;
ms_type = mst_solib_trampoline;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -202,6 +211,7 @@ som_symtab_read (abfd, addr, objfile)
case ST_CODE:
symname = bufp->name.n_strx + stringtab;
ms_type = mst_file_text;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -227,6 +237,7 @@ som_symtab_read (abfd, addr, objfile)
case ST_MILLICODE:
symname = bufp->name.n_strx + stringtab;
ms_type = mst_file_text;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -241,6 +252,7 @@ som_symtab_read (abfd, addr, objfile)
ms_type = mst_solib_trampoline;
else
ms_type = mst_file_text;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -249,6 +261,7 @@ som_symtab_read (abfd, addr, objfile)
case ST_STUB:
symname = bufp->name.n_strx + stringtab;
ms_type = mst_solib_trampoline;
bufp->symbol_value += text_offset;
#ifdef SMASH_TEXT_ADDRESS
SMASH_TEXT_ADDRESS (bufp->symbol_value);
#endif
@ -316,18 +329,13 @@ som_symfile_read (objfile, section_offsets, mainline)
{
bfd *abfd = objfile->obfd;
struct cleanup *back_to;
CORE_ADDR offset;
init_minimal_symbol_collection ();
back_to = make_cleanup (discard_minimal_symbols, 0);
/* FIXME, should take a section_offsets param, not just an offset. */
offset = ANOFFSET (section_offsets, 0);
/* Process the normal SOM symbol table first. */
som_symtab_read (abfd, offset, objfile);
som_symtab_read (abfd, objfile, section_offsets);
/* Now read information from the stabs debug sections. */
stabsect_build_psymtabs (objfile, section_offsets, mainline,

319
gdb/somsolib.c Normal file
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@ -0,0 +1,319 @@
/* Handle HP SOM shared libraries for GDB, the GNU Debugger.
Copyright 1993 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Written by the Center for Software Science at the Univerity of Utah
and by Cygnus Support. */
#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"
/* We don't currently use this structure, but it isn't documented anywhere,
and we'll likely need it in som_solib_add as more shared library support
is added. */
struct som_solib_mapped_entry
{
/* The name of the library. */
char *name;
/* Version of this structure (it is expected to change again in hpux10. */
unsigned char struct_version;
/* Binding mode for this library. */
unsigned char bind_mode;
/* Version of this library. */
short library_version;
/* Start of text address, link-time text location, end of text address. */
CORE_ADDR text_addr;
CORE_ADDR text_link_addr;
CORE_ADDR text_end;
/* Start of data, start of bss and end of data. */
CORE_ADDR data_start;
CORE_ADDR bss_start;
CORE_ADDR data_end;
/* Value of linkage pointer (%r19). */
CORE_ADDR got_value;
/* Next entry. */
struct som_solib_mapped_entry *next;
/* There are other fields, but I don't have information as to what is
contained in them. */
};
/* Add symbols from shared libraries into the symtab list. */
void
som_solib_add (arg_string, from_tty, target)
char *arg_string;
int from_tty;
struct target_ops *target;
{
struct minimal_symbol *msymbol;
CORE_ADDR addr;
int status;
char buf[4];
msymbol = lookup_minimal_symbol ("__dld_list", (struct objfile *) NULL);
if (!msymbol)
{
/* Older crt0.o files (hpux8) don't have __dld_list as a symbol,
but the data is still available if you know where to look. */
msymbol = lookup_minimal_symbol ("__dld_flags", (struct objfile *)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 /usr/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.
Skip the first entry since it's our executable. */
status = target_read_memory (addr + 36, buf, 4);
if (status != 0)
{
error ("Error while reading dynamic library list.\n");
return;
}
addr = extract_unsigned_integer (buf, 4);
while (1)
{
CORE_ADDR name_addr, text_addr;
unsigned int name_len;
char *name;
if (addr == 0)
break;
/* Get a pointer to the name of this library. */
status = target_read_memory (addr, buf, 4);
if (status != 0)
{
error ("Error while reading dynamic library list.\n");
return;
}
name_addr = extract_unsigned_integer (buf, 4);
name_len = 0;
while (1)
{
target_read_memory (name_addr + name_len, buf, 1);
if (status != 0)
{
error ("Error while reading dynamic library list.\n");
return;
}
name_len++;
if (*buf == '\0')
break;
}
name = alloca (name_len);
status = target_read_memory (name_addr, name, name_len);
if (status != 0)
{
error ("Error while reading dynamic library list.\n");
return;
}
name = obsavestring (name, name_len - 1,
&symfile_objfile->symbol_obstack);
status = target_read_memory (addr + 8, buf, 4);
if (status != 0)
{
error ("Error while reading dynamic library list.\n");
return;
}
text_addr = extract_unsigned_integer (buf, 4);
/* OK, we've got everything we need. Tell GDB about it. */
symbol_file_add (name, from_tty, text_addr, 0, 0, 0);
/* Get address of the next record. */
status = target_read_memory (addr + 36, buf, 4);
if (status != 0)
{
error ("Error while reading dynamic library list.\n");
return;
}
addr = extract_unsigned_integer (buf, 4);
}
/* 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;
}
/* 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
__dld_list structure when loading/unloading libraries.
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
som_solib_create_inferior_hook()
{
struct minimal_symbol *msymbol;
asection *shlib_info;
unsigned int dld_flags, status;
char shadow_contents[BREAKPOINT_MAX], buf[4];
CORE_ADDR anaddr;
/* 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;
/* 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", (struct objfile *) NULL);
if (msymbol == NULL)
{
error ("Unable to find __dld_flags symbol in object file.\n");
return;
}
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");
return;
}
dld_flags = extract_unsigned_integer (buf, 4);
/* Turn on the flags we care about. */
dld_flags |= 0x5;
store_unsigned_integer (buf, 4, dld_flags);
status = target_write_memory (anaddr, buf, 4);
if (status != 0)
{
error ("Unable to write __dld_flags\n");
return;
}
/* Now find the address of _start and set a breakpoint there. */
msymbol = lookup_minimal_symbol ("_start", symfile_objfile);
if (msymbol == NULL)
{
error ("Unable to find _start symbol in object file.\n");
return;
}
anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
if (target_insert_breakpoint (anaddr, shadow_contents))
{
error ("Unable to set breakpoint at _start.\n");
return;
}
/* Start the process again and wait for it to hit our breakpoint. */
clear_proceed_status ();
stop_soon_quietly = 1;
stop_signal = TARGET_SIGNAL_0;
do
{
target_resume (-1, 0, stop_signal);
wait_for_inferior ();
}
while (stop_signal != TARGET_SIGNAL_TRAP);
stop_soon_quietly = 0;
/* All the libraries should be mapped in now. Remove our breakpoint and
read in the symbol tables from the shared libraries. */
if (target_remove_breakpoint (anaddr, shadow_contents))
{
error ("Unable to remove breakpoint at _start.\n");
return;
}
som_solib_add ((char *) 0, 0, (struct target_ops *) 0);
}

43
gdb/somsolib.h Normal file
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@ -0,0 +1,43 @@
/* HP SOM Shared library declarations for GDB, the GNU Debugger.
Copyright (C) 1992 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Written by the Center for Software Science at the Univerity of Utah
and by Cygnus Support. */
#ifdef __STDC__ /* Forward decl's for prototypes */
struct target_ops;
#endif
/* Called to add symbols from a shared library to gdb's symbol table. */
#define SOLIB_ADD(filename, from_tty, targ) \
som_solib_add (filename, from_tty, targ)
extern void
som_solib_add PARAMS ((char *, int, struct target_ops *));
/* Function to be called when the inferior starts up, to discover the names
of shared libraries that are dynamically linked, the base addresses to
which they are linked, and sufficient information to read in their symbols
at a later time. */
#define SOLIB_CREATE_INFERIOR_HOOK(PID) som_solib_create_inferior_hook()
extern void
som_solib_create_inferior_hook PARAMS((void));