/* 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.
registers_fetched ();
}
-\f
-/* 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);
-}
-\f
/* Register that we are able to handle irix5 core file formats.
This really is bfd_target_unknown_flavour */
--- /dev/null
+/* 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;
+}
projects / thirdparty / binutils-gdb.git / commitdiff
