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[PATCH] Renovate IRIX shared library support
- From: Kevin Buettner <kevinb at redhat dot com>
- To: gdb-patches at sources dot redhat dot com
- Date: Fri, 26 Jul 2002 18:22:06 -0700
- Subject: [PATCH] Renovate IRIX shared library support
I've just committed the patch below. I'll commit the configury changes
separately.
The old shared library support contained in irix5-nat.c would only
handle shared libraries using the o32 and n32 ABIs. In addition, it
relied on system header files for the layout of the shared library
data structures.
The new support contained in solib-irix.c handles shared libraries
using the n64 ABI in addition o32 and n32. The new support does not
depend upon IRIX header files for the layout of the shared library
data structures. This means that it's possible to use this support in
a cross-debugger configuration.
The best thing about this patch though (IMO) is that it eliminates
some of the code duplication between the generic solib machinery and
the IRIX solib support.
* irix5-nat.c: Move IRIX shared library support from here...
* solib-irix.c: ...to here. Revised substantially to work with
generic solib framework.
Index: irix5-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/irix5-nat.c,v
retrieving revision 1.17
diff -u -p -r1.17 irix5-nat.c
--- irix5-nat.c 27 Feb 2002 01:40:35 -0000 1.17
+++ irix5-nat.c 27 Jul 2002 00:43:39 -0000
@@ -1,6 +1,6 @@
/* Native support for the SGI Iris running IRIX version 5, for GDB.
Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
- 1999, 2000, 2001 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
Implemented for Irix 4.x by Garrett A. Wollman.
@@ -254,1052 +254,6 @@ fetch_core_registers (char *core_reg_sec
registers_fetched ();
}
-
-/* Irix 5 uses what appears to be a unique form of shared library
- support. This is a copy of solib.c modified for Irix 5. */
-/* FIXME: Most of this code could be merged with osfsolib.c and solib.c
- by using next_link_map_member and xfer_link_map_member in solib.c. */
-
-#include <sys/types.h>
-#include <signal.h>
-#include <sys/param.h>
-#include <fcntl.h>
-
-/* <obj.h> includes <sym.h> and <symconst.h>, which causes conflicts
- with our versions of those files included by tm-mips.h. Prevent
- <obj.h> from including them with some appropriate defines. */
-#define __SYM_H__
-#define __SYMCONST_H__
-#include <obj.h>
-#ifdef HAVE_OBJLIST_H
-#include <objlist.h>
-#endif
-
-#ifdef NEW_OBJ_INFO_MAGIC
-#define HANDLE_NEW_OBJ_LIST
-#endif
-
-#include "symtab.h"
-#include "bfd.h"
-#include "symfile.h"
-#include "objfiles.h"
-#include "command.h"
-#include "frame.h"
-#include "gdb_regex.h"
-#include "inferior.h"
-#include "language.h"
-#include "gdbcmd.h"
-
-/* The symbol which starts off the list of shared libraries. */
-#define DEBUG_BASE "__rld_obj_head"
-
-/* Irix 6.x introduces a new variant of object lists.
- To be able to debug O32 executables under Irix 6, we have to handle both
- variants. */
-
-typedef enum
-{
- OBJ_LIST_OLD, /* Pre Irix 6.x object list. */
- OBJ_LIST_32, /* 32 Bit Elf32_Obj_Info. */
- OBJ_LIST_64 /* 64 Bit Elf64_Obj_Info, FIXME not yet implemented. */
-}
-obj_list_variant;
-
-/* Define our own link_map structure.
- This will help to share code with osfsolib.c and solib.c. */
-
-struct link_map
- {
- obj_list_variant l_variant; /* which variant of object list */
- CORE_ADDR l_lladdr; /* addr in inferior list was read from */
- CORE_ADDR l_next; /* address of next object list entry */
- };
-
-/* Irix 5 shared objects are pre-linked to particular addresses
- although the dynamic linker may have to relocate them if the
- address ranges of the libraries used by the main program clash.
- The offset is the difference between the address where the object
- is mapped and the binding address of the shared library. */
-#define LM_OFFSET(so) ((so) -> offset)
-/* Loaded address of shared library. */
-#define LM_ADDR(so) ((so) -> lmstart)
-
-char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
-
-struct so_list
- {
- struct so_list *next; /* next structure in linked list */
- struct link_map lm;
- CORE_ADDR offset; /* prelink to load address offset */
- char *so_name; /* shared object lib name */
- CORE_ADDR lmstart; /* lower addr bound of mapped object */
- CORE_ADDR lmend; /* upper addr bound of mapped object */
- char symbols_loaded; /* flag: symbols read in yet? */
- char from_tty; /* flag: print msgs? */
- struct objfile *objfile; /* objfile for loaded lib */
- struct section_table *sections;
- struct section_table *sections_end;
- struct section_table *textsection;
- bfd *abfd;
- };
-
-static struct so_list *so_list_head; /* List of known shared objects */
-static CORE_ADDR debug_base; /* Base of dynamic linker structures */
-static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
-
-/* Local function prototypes */
-
-static void sharedlibrary_command (char *, int);
-
-static int enable_break (void);
-
-static int disable_break (void);
-
-static void info_sharedlibrary_command (char *, int);
-
-static int symbol_add_stub (void *);
-
-static struct so_list *find_solib (struct so_list *);
-
-static struct link_map *first_link_map_member (void);
-
-static struct link_map *next_link_map_member (struct so_list *);
-
-static void xfer_link_map_member (struct so_list *, struct link_map *);
-
-static CORE_ADDR locate_base (void);
-
-static int solib_map_sections (void *);
-
-/*
-
- LOCAL FUNCTION
-
- solib_map_sections -- open bfd and build sections for shared lib
-
- SYNOPSIS
-
- static int solib_map_sections (struct so_list *so)
-
- DESCRIPTION
-
- Given a pointer to one of the shared objects in our list
- of mapped objects, use the recorded name to open a bfd
- descriptor for the object, build a section table, and then
- relocate all the section addresses by the base address at
- which the shared object was mapped.
-
- FIXMES
-
- In most (all?) cases the shared object file name recorded in the
- dynamic linkage tables will be a fully qualified pathname. For
- cases where it isn't, do we really mimic the systems search
- mechanism correctly in the below code (particularly the tilde
- expansion stuff?).
- */
-
-static int
-solib_map_sections (void *arg)
-{
- struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */
- char *filename;
- char *scratch_pathname;
- int scratch_chan;
- struct section_table *p;
- struct cleanup *old_chain;
- bfd *abfd;
-
- filename = tilde_expand (so->so_name);
- old_chain = make_cleanup (xfree, filename);
-
- scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
- &scratch_pathname);
- if (scratch_chan < 0)
- {
- scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
- O_RDONLY, 0, &scratch_pathname);
- }
- if (scratch_chan < 0)
- {
- perror_with_name (filename);
- }
- /* Leave scratch_pathname allocated. abfd->name will point to it. */
-
- abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
- if (!abfd)
- {
- close (scratch_chan);
- error ("Could not open `%s' as an executable file: %s",
- scratch_pathname, bfd_errmsg (bfd_get_error ()));
- }
- /* Leave bfd open, core_xfer_memory and "info files" need it. */
- so->abfd = abfd;
- abfd->cacheable = 1;
-
- if (!bfd_check_format (abfd, bfd_object))
- {
- error ("\"%s\": not in executable format: %s.",
- scratch_pathname, bfd_errmsg (bfd_get_error ()));
- }
- if (build_section_table (abfd, &so->sections, &so->sections_end))
- {
- error ("Can't find the file sections in `%s': %s",
- bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
- }
-
- for (p = so->sections; p < so->sections_end; p++)
- {
- /* Relocate the section binding addresses as recorded in the shared
- object's file by the offset to get the address to which the
- object was actually mapped. */
- p->addr += LM_OFFSET (so);
- p->endaddr += LM_OFFSET (so);
- so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend);
- if (STREQ (p->the_bfd_section->name, ".text"))
- {
- so->textsection = p;
- }
- }
-
- /* Free the file names, close the file now. */
- do_cleanups (old_chain);
-
- /* must be non-zero */
- return (1);
-}
-
-/*
-
- 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 symbol defined by the macro DEBUG_BASE.
- 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 much more complicated because the dynamic linker
- and it's structures are located in the shared C library, which gets
- run as the executable's "interpreter" by the kernel. We have to go
- to a lot more work to discover the address of DEBUG_BASE. 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.
-
- Irix 5 is basically like SunOS.
-
- Note that we can assume nothing about the process state at the time
- we need to find this address. We may be stopped on the first instruc-
- tion of the interpreter (C shared library), the first instruction of
- the executable itself, or somewhere else entirely (if we attached
- to the process for example).
-
- */
-
-static CORE_ADDR
-locate_base (void)
-{
- struct minimal_symbol *msymbol;
- CORE_ADDR address = 0;
-
- msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
- {
- address = SYMBOL_VALUE_ADDRESS (msymbol);
- }
- return (address);
-}
-
-/*
-
- LOCAL FUNCTION
-
- first_link_map_member -- locate first member in dynamic linker's map
-
- SYNOPSIS
-
- static struct link_map *first_link_map_member (void)
-
- DESCRIPTION
-
- Read in a copy of the first member in the inferior's dynamic
- link map from the inferior's dynamic linker structures, and return
- a pointer to the link map descriptor.
- */
-
-static struct link_map *
-first_link_map_member (void)
-{
- struct obj_list *listp;
- struct obj_list list_old;
- struct link_map *lm;
- static struct link_map first_lm;
- CORE_ADDR lladdr;
- CORE_ADDR next_lladdr;
-
- /* We have not already read in the dynamic linking structures
- from the inferior, lookup the address of the base structure. */
- debug_base = locate_base ();
- if (debug_base == 0)
- return NULL;
-
- /* Get address of first list entry. */
- read_memory (debug_base, (char *) &listp, sizeof (struct obj_list *));
-
- if (listp == NULL)
- return NULL;
-
- /* Get first list entry. */
- /* The MIPS Sign extends addresses. */
- lladdr = host_pointer_to_address (listp);
- read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list));
-
- /* The first entry in the list is the object file we are debugging,
- so skip it. */
- next_lladdr = host_pointer_to_address (list_old.next);
-
-#ifdef HANDLE_NEW_OBJ_LIST
- if (list_old.data == NEW_OBJ_INFO_MAGIC)
- {
- Elf32_Obj_Info list_32;
-
- read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info));
- if (list_32.oi_size != sizeof (Elf32_Obj_Info))
- return NULL;
- next_lladdr = (CORE_ADDR) list_32.oi_next;
- }
-#endif
-
- if (next_lladdr == 0)
- return NULL;
-
- first_lm.l_lladdr = next_lladdr;
- lm = &first_lm;
- return lm;
-}
-
-/*
-
- LOCAL FUNCTION
-
- next_link_map_member -- locate next member in dynamic linker's map
-
- SYNOPSIS
-
- static struct link_map *next_link_map_member (so_list_ptr)
-
- DESCRIPTION
-
- Read in a copy of the next member in the inferior's dynamic
- link map from the inferior's dynamic linker structures, and return
- a pointer to the link map descriptor.
- */
-
-static struct link_map *
-next_link_map_member (struct so_list *so_list_ptr)
-{
- struct link_map *lm = &so_list_ptr->lm;
- CORE_ADDR next_lladdr = lm->l_next;
- static struct link_map next_lm;
-
- if (next_lladdr == 0)
- {
- /* We have hit the end of the list, so check to see if any were
- added, but be quiet if we can't read from the target any more. */
- int status = 0;
-
- if (lm->l_variant == OBJ_LIST_OLD)
- {
- struct obj_list list_old;
-
- status = target_read_memory (lm->l_lladdr,
- (char *) &list_old,
- sizeof (struct obj_list));
- next_lladdr = host_pointer_to_address (list_old.next);
- }
-#ifdef HANDLE_NEW_OBJ_LIST
- else if (lm->l_variant == OBJ_LIST_32)
- {
- Elf32_Obj_Info list_32;
- status = target_read_memory (lm->l_lladdr,
- (char *) &list_32,
- sizeof (Elf32_Obj_Info));
- next_lladdr = (CORE_ADDR) list_32.oi_next;
- }
-#endif
-
- if (status != 0 || next_lladdr == 0)
- return NULL;
- }
-
- next_lm.l_lladdr = next_lladdr;
- lm = &next_lm;
- return lm;
-}
-
-/*
-
- LOCAL FUNCTION
-
- xfer_link_map_member -- set local variables from dynamic linker's map
-
- SYNOPSIS
-
- static void xfer_link_map_member (so_list_ptr, lm)
-
- DESCRIPTION
-
- Read in a copy of the requested member in the inferior's dynamic
- link map from the inferior's dynamic linker structures, and fill
- in the necessary so_list_ptr elements.
- */
-
-static void
-xfer_link_map_member (struct so_list *so_list_ptr, struct link_map *lm)
-{
- struct obj_list list_old;
- CORE_ADDR lladdr = lm->l_lladdr;
- struct link_map *new_lm = &so_list_ptr->lm;
- int errcode;
-
- read_memory (lladdr, (char *) &list_old, sizeof (struct obj_list));
-
- new_lm->l_variant = OBJ_LIST_OLD;
- new_lm->l_lladdr = lladdr;
- new_lm->l_next = host_pointer_to_address (list_old.next);
-
-#ifdef HANDLE_NEW_OBJ_LIST
- if (list_old.data == NEW_OBJ_INFO_MAGIC)
- {
- Elf32_Obj_Info list_32;
-
- read_memory (lladdr, (char *) &list_32, sizeof (Elf32_Obj_Info));
- if (list_32.oi_size != sizeof (Elf32_Obj_Info))
- return;
- new_lm->l_variant = OBJ_LIST_32;
- new_lm->l_next = (CORE_ADDR) list_32.oi_next;
-
- target_read_string ((CORE_ADDR) list_32.oi_pathname,
- &so_list_ptr->so_name,
- list_32.oi_pathname_len + 1, &errcode);
- if (errcode != 0)
- memory_error (errcode, (CORE_ADDR) list_32.oi_pathname);
-
- LM_ADDR (so_list_ptr) = (CORE_ADDR) list_32.oi_ehdr;
- LM_OFFSET (so_list_ptr) =
- (CORE_ADDR) list_32.oi_ehdr - (CORE_ADDR) list_32.oi_orig_ehdr;
- }
- else
-#endif
- {
-#if defined (_MIPS_SIM_NABI32) && _MIPS_SIM == _MIPS_SIM_NABI32
- /* If we are compiling GDB under N32 ABI, the alignments in
- the obj struct are different from the O32 ABI and we will get
- wrong values when accessing the struct.
- As a workaround we use fixed values which are good for
- Irix 6.2. */
- char buf[432];
-
- read_memory ((CORE_ADDR) list_old.data, buf, sizeof (buf));
-
- target_read_string (extract_address (&buf[236], 4),
- &so_list_ptr->so_name,
- INT_MAX, &errcode);
- if (errcode != 0)
- memory_error (errcode, extract_address (&buf[236], 4));
-
- LM_ADDR (so_list_ptr) = extract_address (&buf[196], 4);
- LM_OFFSET (so_list_ptr) =
- extract_address (&buf[196], 4) - extract_address (&buf[248], 4);
-#else
- struct obj obj_old;
-
- read_memory ((CORE_ADDR) list_old.data, (char *) &obj_old,
- sizeof (struct obj));
-
- target_read_string ((CORE_ADDR) obj_old.o_path,
- &so_list_ptr->so_name,
- INT_MAX, &errcode);
- if (errcode != 0)
- memory_error (errcode, (CORE_ADDR) obj_old.o_path);
-
- LM_ADDR (so_list_ptr) = (CORE_ADDR) obj_old.o_praw;
- LM_OFFSET (so_list_ptr) =
- (CORE_ADDR) obj_old.o_praw - obj_old.o_base_address;
-#endif
- }
-
- catch_errors (solib_map_sections, (char *) so_list_ptr,
- "Error while mapping shared library sections:\n",
- RETURN_MASK_ALL);
-}
-
-
-/*
-
- LOCAL FUNCTION
-
- find_solib -- step through list of shared objects
-
- SYNOPSIS
-
- struct so_list *find_solib (struct so_list *so_list_ptr)
-
- DESCRIPTION
-
- This module contains the routine which finds the names of any
- loaded "images" in the current process. The argument in must be
- NULL on the first call, and then the returned value must be passed
- in on subsequent calls. This provides the capability to "step" down
- the list of loaded objects. On the last object, a NULL value is
- returned.
- */
-
-static struct so_list *
-find_solib (struct so_list *so_list_ptr)
-{
- struct so_list *so_list_next = NULL;
- struct link_map *lm = NULL;
- struct so_list *new;
-
- if (so_list_ptr == NULL)
- {
- /* We are setting up for a new scan through the loaded images. */
- if ((so_list_next = so_list_head) == NULL)
- {
- /* Find the first link map list member. */
- lm = first_link_map_member ();
- }
- }
- else
- {
- /* We have been called before, and are in the process of walking
- the shared library list. Advance to the next shared object. */
- lm = next_link_map_member (so_list_ptr);
- so_list_next = so_list_ptr->next;
- }
- if ((so_list_next == NULL) && (lm != NULL))
- {
- new = (struct so_list *) xmalloc (sizeof (struct so_list));
- memset ((char *) new, 0, sizeof (struct so_list));
- /* Add the new node as the next node in the list, or as the root
- node if this is the first one. */
- if (so_list_ptr != NULL)
- {
- so_list_ptr->next = new;
- }
- else
- {
- so_list_head = new;
- }
- so_list_next = new;
- xfer_link_map_member (new, lm);
- }
- return (so_list_next);
-}
-
-/* A small stub to get us past the arg-passing pinhole of catch_errors. */
-
-static int
-symbol_add_stub (void *arg)
-{
- register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
- CORE_ADDR text_addr = 0;
- struct section_addr_info section_addrs;
-
- memset (§ion_addrs, 0, sizeof (section_addrs));
- if (so->textsection)
- text_addr = so->textsection->addr;
- else if (so->abfd != NULL)
- {
- asection *lowest_sect;
-
- /* If we didn't find a mapped non zero sized .text section, set up
- text_addr so that the relocation in symbol_file_add does no harm. */
-
- lowest_sect = bfd_get_section_by_name (so->abfd, ".text");
- if (lowest_sect == NULL)
- bfd_map_over_sections (so->abfd, find_lowest_section,
- (PTR) &lowest_sect);
- if (lowest_sect)
- text_addr = bfd_section_vma (so->abfd, lowest_sect) + LM_OFFSET (so);
- }
-
-
- section_addrs.other[0].name = ".text";
- section_addrs.other[0].addr = text_addr;
- so->objfile = symbol_file_add (so->so_name, so->from_tty,
- §ion_addrs, 0, 0);
- /* must be non-zero */
- return (1);
-}
-
-/*
-
- GLOBAL FUNCTION
-
- solib_add -- add a shared library file to the symtab and section list
-
- SYNOPSIS
-
- void solib_add (char *arg_string, int from_tty,
- struct target_ops *target, int readsyms)
-
- DESCRIPTION
-
- */
-
-void
-solib_add (char *arg_string, int from_tty, struct target_ops *target, int readsyms)
-{
- register struct so_list *so = NULL; /* link map state variable */
-
- /* Last shared library that we read. */
- struct so_list *so_last = NULL;
-
- char *re_err;
- int count;
- int old;
-
- if (!readsyms)
- return;
-
- if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
- {
- error ("Invalid regexp: %s", re_err);
- }
-
- /* Add the shared library sections to the section table of the
- specified target, if any. */
- if (target)
- {
- /* Count how many new section_table entries there are. */
- so = NULL;
- count = 0;
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0])
- {
- count += so->sections_end - so->sections;
- }
- }
-
- if (count)
- {
- old = target_resize_to_sections (target, count);
-
- /* Add these section table entries to the target's table. */
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0])
- {
- count = so->sections_end - so->sections;
- memcpy ((char *) (target->to_sections + old),
- so->sections,
- (sizeof (struct section_table)) * count);
- old += count;
- }
- }
- }
- }
-
- /* Now add the symbol files. */
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0] && re_exec (so->so_name))
- {
- so->from_tty = from_tty;
- if (so->symbols_loaded)
- {
- if (from_tty)
- {
- printf_unfiltered ("Symbols already loaded for %s\n", so->so_name);
- }
- }
- else if (catch_errors
- (symbol_add_stub, (char *) so,
- "Error while reading shared library symbols:\n",
- RETURN_MASK_ALL))
- {
- so_last = so;
- so->symbols_loaded = 1;
- }
- }
- }
-
- /* Getting new symbols may change our opinion about what is
- frameless. */
- if (so_last)
- reinit_frame_cache ();
-}
-
-/*
-
- LOCAL FUNCTION
-
- info_sharedlibrary_command -- code for "info sharedlibrary"
-
- SYNOPSIS
-
- static void info_sharedlibrary_command ()
-
- DESCRIPTION
-
- Walk through the shared library list and print information
- about each attached library.
- */
-
-static void
-info_sharedlibrary_command (char *ignore, int from_tty)
-{
- register struct so_list *so = NULL; /* link map state variable */
- int header_done = 0;
-
- if (exec_bfd == NULL)
- {
- printf_unfiltered ("No executable file.\n");
- return;
- }
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0])
- {
- if (!header_done)
- {
- printf_unfiltered ("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
- "Shared Object Library");
- header_done++;
- }
- printf_unfiltered ("%-12s",
- local_hex_string_custom ((unsigned long) LM_ADDR (so),
- "08l"));
- printf_unfiltered ("%-12s",
- local_hex_string_custom ((unsigned long) so->lmend,
- "08l"));
- printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
- printf_unfiltered ("%s\n", so->so_name);
- }
- }
- if (so_list_head == NULL)
- {
- printf_unfiltered ("No shared libraries loaded at this time.\n");
- }
-}
-
-/*
-
- GLOBAL FUNCTION
-
- solib_address -- check to see if an address is in a shared lib
-
- SYNOPSIS
-
- char *solib_address (CORE_ADDR address)
-
- DESCRIPTION
-
- Provides a hook for other gdb routines to discover whether or
- not a particular address is within the mapped address space of
- a shared library. Any address between the base mapping address
- and the first address beyond the end of the last mapping, is
- considered to be within the shared library address space, for
- our purposes.
-
- For example, this routine is called at one point to disable
- breakpoints which are in shared libraries that are not currently
- mapped in.
- */
-
-char *
-solib_address (CORE_ADDR address)
-{
- register struct so_list *so = 0; /* link map state variable */
-
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0])
- {
- if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
- (address < (CORE_ADDR) so->lmend))
- return (so->so_name);
- }
- }
- return (0);
-}
-
-/* Called by free_all_symtabs */
-
-void
-clear_solib (void)
-{
- struct so_list *next;
- char *bfd_filename;
-
- disable_breakpoints_in_shlibs (1);
-
- while (so_list_head)
- {
- if (so_list_head->sections)
- {
- xfree (so_list_head->sections);
- }
- if (so_list_head->abfd)
- {
- remove_target_sections (so_list_head->abfd);
- bfd_filename = bfd_get_filename (so_list_head->abfd);
- if (!bfd_close (so_list_head->abfd))
- warning ("cannot close \"%s\": %s",
- bfd_filename, bfd_errmsg (bfd_get_error ()));
- }
- else
- /* This happens for the executable on SVR4. */
- bfd_filename = NULL;
-
- next = so_list_head->next;
- if (bfd_filename)
- xfree (bfd_filename);
- xfree (so_list_head->so_name);
- xfree (so_list_head);
- so_list_head = next;
- }
- debug_base = 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)
-{
- int status = 1;
-
-
- /* Note that breakpoint address and original contents are in our address
- space, so we just need to write the original contents back. */
-
- if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
- {
- status = 0;
- }
-
- /* 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 (status);
-}
-
-/*
-
- LOCAL FUNCTION
-
- enable_break -- arrange for dynamic linker to hit breakpoint
-
- SYNOPSIS
-
- int enable_break (void)
-
- DESCRIPTION
-
- This functions inserts a breakpoint at the entry point of the
- main executable, where all shared libraries are mapped in.
- */
-
-static int
-enable_break (void)
-{
- if (symfile_objfile != NULL
- && target_insert_breakpoint (symfile_objfile->ei.entry_point,
- shadow_contents) == 0)
- {
- breakpoint_addr = symfile_objfile->ei.entry_point;
- return 1;
- }
-
- return 0;
-}
-
-/*
-
- GLOBAL FUNCTION
-
- solib_create_inferior_hook -- shared library startup support
-
- SYNOPSIS
-
- void solib_create_inferior_hook()
-
- DESCRIPTION
-
- When gdb starts up the inferior, it nurses it along (through the
- shell) until it is ready to execute it's first instruction. At this
- point, this function gets called via expansion of the macro
- SOLIB_CREATE_INFERIOR_HOOK.
-
- For 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.
- */
-
-void
-solib_create_inferior_hook (void)
-{
- if (!enable_break ())
- {
- warning ("shared library handler failed to enable breakpoint");
- return;
- }
-
- /* 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. */
-
- clear_proceed_status ();
- stop_soon_quietly = 1;
- stop_signal = TARGET_SIGNAL_0;
- do
- {
- target_resume (pid_to_ptid (-1), 0, stop_signal);
- wait_for_inferior ();
- }
- while (stop_signal != TARGET_SIGNAL_TRAP);
-
- /* 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. */
-
- if (DECR_PC_AFTER_BREAK)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- }
-
- if (!disable_break ())
- {
- warning ("shared library handler failed to disable breakpoint");
- }
-
- /* solib_add will call reinit_frame_cache.
- But we are stopped in the startup code and we might not have symbols
- for the startup code, so heuristic_proc_start could be called
- and will put out an annoying warning.
- Delaying the resetting of stop_soon_quietly until after symbol loading
- suppresses the warning. */
- solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
- stop_soon_quietly = 0;
-}
-
-/*
-
- LOCAL FUNCTION
-
- sharedlibrary_command -- handle command to explicitly add library
-
- SYNOPSIS
-
- static void sharedlibrary_command (char *args, int from_tty)
-
- DESCRIPTION
-
- */
-
-static void
-sharedlibrary_command (char *args, int from_tty)
-{
- dont_repeat ();
- solib_add (args, from_tty, (struct target_ops *) 0, 1);
-}
-
-void
-_initialize_solib (void)
-{
- add_com ("sharedlibrary", class_files, sharedlibrary_command,
- "Load shared object library symbols for files matching REGEXP.");
- add_info ("sharedlibrary", info_sharedlibrary_command,
- "Status of loaded shared object libraries.");
-
- add_show_from_set
- (add_set_cmd ("auto-solib-add", class_support, var_boolean,
- (char *) &auto_solib_add,
- "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'.",
- &setlist),
- &showlist);
-}
-
/* Register that we are able to handle irix5 core file formats.
This really is bfd_target_unknown_flavour */
Index: solib-irix.c
===================================================================
RCS file: solib-irix.c
diff -N solib-irix.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ solib-irix.c 27 Jul 2002 00:43:41 -0000
@@ -0,0 +1,725 @@
+/* Shared library support for IRIX.
+ Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
+ Free Software Foundation, Inc.
+
+ This file was created using portions of irix5-nat.c originally
+ contributed to GDB by Ian Lance Taylor.
+
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+
+#include "symtab.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdbcore.h"
+#include "target.h"
+#include "inferior.h"
+
+#include "solist.h"
+
+/* Link map info to include in an allocate so_list entry. Unlike some
+ of the other solib backends, this (Irix) backend chooses to decode
+ the link map info obtained from the target and store it as (mostly)
+ CORE_ADDRs which need no further decoding. This is more convenient
+ because there are three different link map formats to worry about.
+ We use a single routine (fetch_lm_info) to read (and decode) the target
+ specific link map data. */
+
+struct lm_info
+{
+ CORE_ADDR addr; /* address of obj_info or obj_list
+ struct on target (from which the
+ following information is obtained). */
+ CORE_ADDR next; /* address of next item in list. */
+ CORE_ADDR reloc_offset; /* amount to relocate by */
+ CORE_ADDR pathname_addr; /* address of pathname */
+ int pathname_len; /* length of pathname */
+};
+
+/* It's not desirable to use the system header files to obtain the
+ structure of the obj_list or obj_info structs. Therefore, we use a
+ platform neutral representation which has been derived from the IRIX
+ header files. */
+
+typedef struct
+{
+ char b[4];
+}
+gdb_int32_bytes;
+typedef struct
+{
+ char b[8];
+}
+gdb_int64_bytes;
+
+/* The "old" obj_list struct. This is used with old (o32) binaries.
+ The ``data'' member points at a much larger and more complicated
+ struct which we will only refer to by offsets. See
+ fetch_lm_info(). */
+
+struct irix_obj_list
+{
+ gdb_int32_bytes data;
+ gdb_int32_bytes next;
+ gdb_int32_bytes prev;
+};
+
+/* The ELF32 and ELF64 versions of the above struct. The oi_magic value
+ corresponds to the ``data'' value in the "old" struct. When this value
+ is 0xffffffff, the data will be in one of the following formats. The
+ ``oi_size'' field is used to decide which one we actually have. */
+
+struct irix_elf32_obj_info
+{
+ gdb_int32_bytes oi_magic;
+ gdb_int32_bytes oi_size;
+ gdb_int32_bytes oi_next;
+ gdb_int32_bytes oi_prev;
+ gdb_int32_bytes oi_ehdr;
+ gdb_int32_bytes oi_orig_ehdr;
+ gdb_int32_bytes oi_pathname;
+ gdb_int32_bytes oi_pathname_len;
+};
+
+struct irix_elf64_obj_info
+{
+ gdb_int32_bytes oi_magic;
+ gdb_int32_bytes oi_size;
+ gdb_int64_bytes oi_next;
+ gdb_int64_bytes oi_prev;
+ gdb_int64_bytes oi_ehdr;
+ gdb_int64_bytes oi_orig_ehdr;
+ gdb_int64_bytes oi_pathname;
+ gdb_int32_bytes oi_pathname_len;
+ gdb_int32_bytes padding;
+};
+
+/* Union of all of the above (plus a split out magic field). */
+
+union irix_obj_info
+{
+ gdb_int32_bytes magic;
+ struct irix_obj_list ol32;
+ struct irix_elf32_obj_info oi32;
+ struct irix_elf64_obj_info oi64;
+};
+
+/* MIPS sign extends its 32 bit addresses. We could conceivably use
+ extract_typed_address here, but to do so, we'd have to construct an
+ appropriate type. Calling extract_signed_integer or
+ extract_address seems simpler. */
+
+static CORE_ADDR
+extract_mips_address (void *addr, int len)
+{
+ if (len <= 32)
+ return extract_signed_integer (addr, len);
+ else
+ return extract_address (addr, len);
+}
+
+/* Fetch and return the link map data associated with ADDR. Note that
+ this routine automatically determines which (of three) link map
+ formats is in use by the target. */
+
+struct lm_info
+fetch_lm_info (CORE_ADDR addr)
+{
+ struct lm_info li;
+ union irix_obj_info buf;
+
+ li.addr = addr;
+
+ /* The smallest region that we'll need is for buf.ol32. We'll read
+ that first. We'll read more of the buffer later if we have to deal
+ with one of the other cases. (We don't want to incur a memory error
+ if we were to read a larger region that generates an error due to
+ being at the end of a page or the like.) */
+ read_memory (addr, (char *) &buf, sizeof (buf.ol32));
+
+ if (extract_unsigned_integer (&buf.magic, sizeof (buf.magic)) != 0xffffffff)
+ {
+ /* Use buf.ol32... */
+ char obj_buf[432];
+ CORE_ADDR obj_addr = extract_mips_address (&buf.ol32.data,
+ sizeof (buf.ol32.data));
+ li.next = extract_mips_address (&buf.ol32.next, sizeof (buf.ol32.next));
+
+ read_memory (obj_addr, obj_buf, sizeof (obj_buf));
+
+ li.pathname_addr = extract_mips_address (&obj_buf[236], 4);
+ li.pathname_len = 0; /* unknown */
+ li.reloc_offset = extract_mips_address (&obj_buf[196], 4)
+ - extract_mips_address (&obj_buf[248], 4);
+
+ }
+ else if (extract_unsigned_integer (&buf.oi32.oi_size,
+ sizeof (buf.oi32.oi_size))
+ == sizeof (buf.oi32))
+ {
+ /* Use buf.oi32... */
+
+ /* Read rest of buffer. */
+ read_memory (addr + sizeof (buf.ol32),
+ ((char *) &buf) + sizeof (buf.ol32),
+ sizeof (buf.oi32) - sizeof (buf.ol32));
+
+ /* Fill in fields using buffer contents. */
+ li.next = extract_mips_address (&buf.oi32.oi_next,
+ sizeof (buf.oi32.oi_next));
+ li.reloc_offset = extract_mips_address (&buf.oi32.oi_ehdr,
+ sizeof (buf.oi32.oi_ehdr))
+ - extract_mips_address (&buf.oi32.oi_orig_ehdr,
+ sizeof (buf.oi32.oi_orig_ehdr));
+ li.pathname_addr = extract_mips_address (&buf.oi32.oi_pathname,
+ sizeof (buf.oi32.oi_pathname));
+ li.pathname_len = extract_unsigned_integer (&buf.oi32.oi_pathname_len,
+ sizeof (buf.oi32.
+ oi_pathname_len));
+ }
+ else if (extract_unsigned_integer (&buf.oi64.oi_size,
+ sizeof (buf.oi64.oi_size))
+ == sizeof (buf.oi64))
+ {
+ /* Use buf.oi64... */
+
+ /* Read rest of buffer. */
+ read_memory (addr + sizeof (buf.ol32),
+ ((char *) &buf) + sizeof (buf.ol32),
+ sizeof (buf.oi64) - sizeof (buf.ol32));
+
+ /* Fill in fields using buffer contents. */
+ li.next = extract_mips_address (&buf.oi64.oi_next,
+ sizeof (buf.oi64.oi_next));
+ li.reloc_offset = extract_mips_address (&buf.oi64.oi_ehdr,
+ sizeof (buf.oi64.oi_ehdr))
+ - extract_mips_address (&buf.oi64.oi_orig_ehdr,
+ sizeof (buf.oi64.oi_orig_ehdr));
+ li.pathname_addr = extract_mips_address (&buf.oi64.oi_pathname,
+ sizeof (buf.oi64.oi_pathname));
+ li.pathname_len = extract_unsigned_integer (&buf.oi64.oi_pathname_len,
+ sizeof (buf.oi64.
+ oi_pathname_len));
+ }
+ else
+ {
+ error ("Unable to fetch shared library obj_info or obj_list info.");
+ }
+
+ return li;
+}
+
+/* The symbol which starts off the list of shared libraries. */
+#define DEBUG_BASE "__rld_obj_head"
+
+char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
+
+static CORE_ADDR debug_base; /* Base of dynamic linker structures */
+static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
+
+/*
+
+ 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 symbol defined by the macro DEBUG_BASE.
+ 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 much more complicated because the dynamic linker
+ and it's structures are located in the shared C library, which gets
+ run as the executable's "interpreter" by the kernel. We have to go
+ to a lot more work to discover the address of DEBUG_BASE. 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.
+
+ Irix 5 is basically like SunOS.
+
+ Note that we can assume nothing about the process state at the time
+ we need to find this address. We may be stopped on the first instruc-
+ tion of the interpreter (C shared library), the first instruction of
+ the executable itself, or somewhere else entirely (if we attached
+ to the process for example).
+
+ */
+
+static CORE_ADDR
+locate_base (void)
+{
+ struct minimal_symbol *msymbol;
+ CORE_ADDR address = 0;
+
+ msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile);
+ if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ {
+ address = SYMBOL_VALUE_ADDRESS (msymbol);
+ }
+ return (address);
+}
+
+/*
+
+ 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)
+{
+ int status = 1;
+
+
+ /* Note that breakpoint address and original contents are in our address
+ space, so we just need to write the original contents back. */
+
+ if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
+ {
+ status = 0;
+ }
+
+ /* 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 (status);
+}
+
+/*
+
+ LOCAL FUNCTION
+
+ enable_break -- arrange for dynamic linker to hit breakpoint
+
+ SYNOPSIS
+
+ int enable_break (void)
+
+ DESCRIPTION
+
+ This functions inserts a breakpoint at the entry point of the
+ main executable, where all shared libraries are mapped in.
+ */
+
+static int
+enable_break (void)
+{
+ if (symfile_objfile != NULL
+ && target_insert_breakpoint (symfile_objfile->ei.entry_point,
+ shadow_contents) == 0)
+ {
+ breakpoint_addr = symfile_objfile->ei.entry_point;
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+
+ LOCAL FUNCTION
+
+ irix_solib_create_inferior_hook -- shared library startup support
+
+ SYNOPSIS
+
+ void solib_create_inferior_hook()
+
+ DESCRIPTION
+
+ When gdb starts up the inferior, it nurses it along (through the
+ shell) until it is ready to execute it's first instruction. At this
+ point, this function gets called via expansion of the macro
+ SOLIB_CREATE_INFERIOR_HOOK.
+
+ For 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
+irix_solib_create_inferior_hook (void)
+{
+ if (!enable_break ())
+ {
+ warning ("shared library handler failed to enable breakpoint");
+ return;
+ }
+
+ /* 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. */
+
+ clear_proceed_status ();
+ stop_soon_quietly = 1;
+ stop_signal = TARGET_SIGNAL_0;
+ do
+ {
+ target_resume (pid_to_ptid (-1), 0, stop_signal);
+ wait_for_inferior ();
+ }
+ while (stop_signal != TARGET_SIGNAL_TRAP);
+
+ /* 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. */
+
+ if (!disable_break ())
+ {
+ warning ("shared library handler failed to disable breakpoint");
+ }
+
+ /* solib_add will call reinit_frame_cache.
+ But we are stopped in the startup code and we might not have symbols
+ for the startup code, so heuristic_proc_start could be called
+ and will put out an annoying warning.
+ Delaying the resetting of stop_soon_quietly until after symbol loading
+ suppresses the warning. */
+ solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
+ stop_soon_quietly = 0;
+ re_enable_breakpoints_in_shlibs ();
+}
+
+/* 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 *
+irix_current_sos (void)
+{
+ CORE_ADDR lma;
+ char addr_buf[8];
+ struct so_list *head = 0;
+ struct so_list **link_ptr = &head;
+ int is_first = 1;
+ struct lm_info lm;
+
+ /* 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;
+ }
+
+ read_memory (debug_base, addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
+ lma = extract_mips_address (addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
+
+ while (lma)
+ {
+ lm = fetch_lm_info (lma);
+ if (!is_first)
+ {
+ int errcode;
+ char *name_buf;
+ int name_size;
+ 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;
+
+ /* Extract this shared object's name. */
+ name_size = lm.pathname_len;
+ if (name_size == 0)
+ name_size = SO_NAME_MAX_PATH_SIZE - 1;
+
+ if (name_size >= SO_NAME_MAX_PATH_SIZE)
+ {
+ name_size = SO_NAME_MAX_PATH_SIZE - 1;
+ warning
+ ("current_sos: truncating name of %d characters to only %d characters",
+ lm.pathname_len, name_size);
+ }
+
+ target_read_string (lm.pathname_addr, &name_buf,
+ name_size, &errcode);
+ if (errcode != 0)
+ {
+ warning ("current_sos: Can't read pathname for load map: %s\n",
+ safe_strerror (errcode));
+ }
+ else
+ {
+ strncpy (new->so_name, name_buf, name_size);
+ new->so_name[name_size] = '\0';
+ xfree (name_buf);
+ strcpy (new->so_original_name, new->so_name);
+ }
+
+ new->next = 0;
+ *link_ptr = new;
+ link_ptr = &new->next;
+
+ discard_cleanups (old_chain);
+ }
+ is_first = 0;
+ lma = lm.next;
+ }
+
+ return head;
+}
+
+/*
+
+ LOCAL FUNCTION
+
+ irix_open_symbol_file_object
+
+ SYNOPSIS
+
+ void irix_open_symbol_file_object (void *from_tty)
+
+ DESCRIPTION
+
+ If no open symbol file, attempt to locate and open the main symbol
+ file. On IRIX, this is the first link map entry. If its name is
+ here, we can open it. Useful when attaching to a process without
+ first loading its symbol file.
+
+ If FROM_TTYP dereferences to a non-zero integer, allow messages to
+ be printed. This parameter is a pointer rather than an int because
+ open_symbol_file_object() is called via catch_errors() and
+ catch_errors() requires a pointer argument. */
+
+static int
+irix_open_symbol_file_object (void *from_ttyp)
+{
+ CORE_ADDR lma;
+ char addr_buf[8];
+ struct lm_info lm;
+ struct cleanup *cleanups;
+ int errcode;
+ int from_tty = *(int *) from_ttyp;
+ char *filename;
+
+ if (symfile_objfile)
+ if (!query ("Attempt to reload symbols from process? "))
+ return 0;
+
+ if ((debug_base = locate_base ()) == 0)
+ return 0; /* failed somehow... */
+
+ /* First link map member should be the executable. */
+ read_memory (debug_base, addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
+ lma = extract_mips_address (addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
+ if (lma == 0)
+ return 0; /* failed somehow... */
+
+ lm = fetch_lm_info (lma);
+
+ if (lm.pathname_addr == 0)
+ return 0; /* No filename. */
+
+ /* Now fetch the filename from target memory. */
+ target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1,
+ &errcode);
+
+ if (errcode)
+ {
+ warning ("failed to read exec filename from attached file: %s",
+ safe_strerror (errcode));
+ return 0;
+ }
+
+ cleanups = make_cleanup (xfree, filename);
+ /* Have a pathname: read the symbol file. */
+ symbol_file_add_main (filename, from_tty);
+
+ do_cleanups (cleanups);
+
+ return 1;
+}
+
+
+/*
+
+ LOCAL FUNCTION
+
+ irix_special_symbol_handling -- additional shared library symbol handling
+
+ SYNOPSIS
+
+ void irix_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 consisted 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.
+
+ However, for IRIX, there's nothing to do.
+
+ */
+
+static void
+irix_special_symbol_handling (void)
+{
+}
+
+/* Using the solist entry SO, relocate the addresses in SEC. */
+
+static void
+irix_relocate_section_addresses (struct so_list *so,
+ struct section_table *sec)
+{
+ sec->addr += so->lm_info->reloc_offset;
+ sec->endaddr += so->lm_info->reloc_offset;
+}
+
+/* Free the lm_info struct. */
+
+static void
+irix_free_so (struct so_list *so)
+{
+ xfree (so->lm_info);
+}
+
+/* Clear backend specific state. */
+
+static void
+irix_clear_solib (void)
+{
+ debug_base = 0;
+}
+
+/* Return 1 if PC lies in the dynamic symbol resolution code of the
+ run time loader. */
+static int
+irix_in_dynsym_resolve_code (CORE_ADDR pc)
+{
+ return 0;
+}
+
+static struct target_so_ops irix_so_ops;
+
+void
+_initialize_irix_solib (void)
+{
+ irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses;
+ irix_so_ops.free_so = irix_free_so;
+ irix_so_ops.clear_solib = irix_clear_solib;
+ irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook;
+ irix_so_ops.special_symbol_handling = irix_special_symbol_handling;
+ irix_so_ops.current_sos = irix_current_sos;
+ irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object;
+ irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code;
+
+ /* FIXME: Don't do this here. *_gdbarch_init() should set so_ops. */
+ current_target_so_ops = &irix_so_ops;
+}