+++ /dev/null
-/* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
- Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000
- Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-/* FIXME: Most of this code could be merged with solib.c by using
- next_link_map_member and xfer_link_map_member in solib.c. */
-
-#include "defs.h"
-
-#include <sys/types.h>
-#include <signal.h>
-#include "gdb_string.h"
-#include <fcntl.h>
-
-#include "symtab.h"
-#include "bfd.h"
-#include "symfile.h"
-#include "objfiles.h"
-#include "gdbcore.h"
-#include "command.h"
-#include "target.h"
-#include "frame.h"
-#include "gdb_regex.h"
-#include "inferior.h"
-#include "language.h"
-#include "gdbcmd.h"
-
-#define MAX_PATH_SIZE 1024 /* FIXME: Should be dynamic */
-
-/* When handling shared libraries, GDB has to find out the pathnames
- of all shared libraries that are currently loaded (to read in their
- symbols) and where the shared libraries are loaded in memory
- (to relocate them properly from their prelinked addresses to the
- current load address).
-
- Under OSF/1 there are two possibilities to get at this information:
- 1) Peek around in the runtime loader structures.
- These are not documented, and they are not defined in the system
- header files. The definitions below were obtained by experimentation,
- but they seem stable enough.
- 2) Use the undocumented libxproc.a library, which contains the
- equivalent ldr_* routines.
- This approach is somewhat cleaner, but it requires that the GDB
- executable is dynamically linked. In addition it requires a
- NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context
- linker specification for GDB and all applications that are using
- libgdb.
- We will use the peeking approach until it becomes unwieldy. */
-
-#ifndef USE_LDR_ROUTINES
-
-/* Definition of runtime loader structures, found by experimentation. */
-#define RLD_CONTEXT_ADDRESS 0x3ffc0000000
-
-typedef struct
- {
- CORE_ADDR next;
- CORE_ADDR previous;
- CORE_ADDR unknown1;
- char *module_name;
- CORE_ADDR modinfo_addr;
- long module_id;
- CORE_ADDR unknown2;
- CORE_ADDR unknown3;
- long region_count;
- CORE_ADDR regioninfo_addr;
- }
-ldr_module_info_t;
-
-typedef struct
- {
- long unknown1;
- CORE_ADDR regionname_addr;
- long protection;
- CORE_ADDR vaddr;
- CORE_ADDR mapaddr;
- long size;
- long unknown2[5];
- }
-ldr_region_info_t;
-
-typedef struct
- {
- CORE_ADDR unknown1;
- CORE_ADDR unknown2;
- CORE_ADDR head;
- CORE_ADDR tail;
- }
-ldr_context_t;
-
-static ldr_context_t ldr_context;
-
-#else
-
-#include <loader.h>
-static ldr_process_t fake_ldr_process;
-
-/* Called by ldr_* routines to read memory from the current target. */
-
-static int ldr_read_memory (CORE_ADDR, char *, int, int);
-
-static int
-ldr_read_memory (CORE_ADDR memaddr, char *myaddr, int len, int readstring)
-{
- int result;
- char *buffer;
-
- if (readstring)
- {
- target_read_string (memaddr, &buffer, len, &result);
- if (result == 0)
- strcpy (myaddr, buffer);
- xfree (buffer);
- }
- else
- result = target_read_memory (memaddr, myaddr, len);
-
- if (result != 0)
- result = -result;
- return result;
-}
-
-#endif
-
-/* Define our own link_map structure.
- This will help to share code with solib.c. */
-
-struct link_map
-{
- CORE_ADDR l_offset; /* prelink to load address offset */
- char *l_name; /* full name of loaded object */
- ldr_module_info_t module_info; /* corresponding module info */
-};
-
-#define LM_OFFSET(so) ((so) -> lm.l_offset)
-#define LM_NAME(so) ((so) -> lm.l_name)
-
-struct so_list
- {
- struct so_list *next; /* next structure in linked list */
- struct link_map lm; /* copy of link map from inferior */
- struct link_map *lmaddr; /* addr in inferior lm was read from */
- CORE_ADDR lmend; /* upper addr bound of mapped object */
- char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
- 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 */
-
-extern int fdmatch (int, int); /* In libiberty */
-
-/* Local function prototypes */
-
-static void sharedlibrary_command (char *, int);
-
-static void info_sharedlibrary_command (char *, int);
-
-static int symbol_add_stub (char *);
-
-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 int solib_map_sections (char *);
-
-/*
-
- 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 (char *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. bfd->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);
-
- return (1);
-}
-
-/*
-
- 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 copy in our address space.
- */
-
-static struct link_map *
-first_link_map_member (void)
-{
- struct link_map *lm = NULL;
- static struct link_map first_lm;
-
-#ifdef USE_LDR_ROUTINES
- ldr_module_t mod_id = LDR_NULL_MODULE;
- size_t retsize;
-
- fake_ldr_process = ldr_core_process ();
- ldr_set_core_reader (ldr_read_memory);
- ldr_xdetach (fake_ldr_process);
- if (ldr_xattach (fake_ldr_process) != 0
- || ldr_next_module (fake_ldr_process, &mod_id) != 0
- || mod_id == LDR_NULL_MODULE
- || ldr_inq_module (fake_ldr_process, mod_id,
- &first_lm.module_info, sizeof (ldr_module_info_t),
- &retsize) != 0)
- return lm;
-#else
- CORE_ADDR ldr_context_addr;
-
- if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
- (char *) &ldr_context_addr,
- sizeof (CORE_ADDR)) != 0
- || target_read_memory (ldr_context_addr,
- (char *) &ldr_context,
- sizeof (ldr_context_t)) != 0
- || target_read_memory ((CORE_ADDR) ldr_context.head,
- (char *) &first_lm.module_info,
- sizeof (ldr_module_info_t)) != 0)
- return lm;
-#endif
-
- lm = &first_lm;
-
- /* The first entry is for the main program and should be skipped. */
- lm->l_name = NULL;
-
- return lm;
-}
-
-static struct link_map *
-next_link_map_member (struct so_list *so_list_ptr)
-{
- struct link_map *lm = NULL;
- static struct link_map next_lm;
-#ifdef USE_LDR_ROUTINES
- ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid;
- size_t retsize;
-
- if (ldr_next_module (fake_ldr_process, &mod_id) != 0
- || mod_id == LDR_NULL_MODULE
- || ldr_inq_module (fake_ldr_process, mod_id,
- &next_lm.module_info, sizeof (ldr_module_info_t),
- &retsize) != 0)
- return lm;
-
- lm = &next_lm;
- lm->l_name = lm->module_info.lmi_name;
-#else
- CORE_ADDR ldr_context_addr;
-
- /* Reread context in case ldr_context.tail was updated. */
-
- if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
- (char *) &ldr_context_addr,
- sizeof (CORE_ADDR)) != 0
- || target_read_memory (ldr_context_addr,
- (char *) &ldr_context,
- sizeof (ldr_context_t)) != 0
- || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
- || target_read_memory (so_list_ptr->lm.module_info.next,
- (char *) &next_lm.module_info,
- sizeof (ldr_module_info_t)) != 0)
- return lm;
-
- lm = &next_lm;
- lm->l_name = lm->module_info.module_name;
-#endif
- return lm;
-}
-
-static void
-xfer_link_map_member (struct so_list *so_list_ptr, struct link_map *lm)
-{
- int i;
- so_list_ptr->lm = *lm;
-
- /* OSF/1 shared libraries are pre-linked to particular addresses,
- but the runtime loader may have to relocate them if the
- address ranges of the libraries used by the target executable clash,
- or if the target executable is linked with the -taso option.
- The offset is the difference between the address where the shared
- library is mapped and the pre-linked address of the shared library.
-
- FIXME: GDB is currently unable to relocate the shared library
- sections by different offsets. If sections are relocated by
- different offsets, put out a warning and use the offset of the
- first section for all remaining sections. */
- LM_OFFSET (so_list_ptr) = 0;
-
- /* There is one entry that has no name (for the inferior executable)
- since it is not a shared object. */
- if (LM_NAME (so_list_ptr) != 0)
- {
-
-#ifdef USE_LDR_ROUTINES
- int len = strlen (LM_NAME (so_list_ptr) + 1);
-
- if (len > MAX_PATH_SIZE)
- len = MAX_PATH_SIZE;
- strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
- so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
-
- for (i = 0; i < lm->module_info.lmi_nregion; i++)
- {
- ldr_region_info_t region_info;
- size_t retsize;
- CORE_ADDR region_offset;
-
- if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid,
- i, ®ion_info, sizeof (region_info),
- &retsize) != 0)
- break;
- region_offset = (CORE_ADDR) region_info.lri_mapaddr
- - (CORE_ADDR) region_info.lri_vaddr;
- if (i == 0)
- LM_OFFSET (so_list_ptr) = region_offset;
- else if (LM_OFFSET (so_list_ptr) != region_offset)
- warning ("cannot handle shared library relocation for %s (%s)",
- so_list_ptr->so_name, region_info.lri_name);
- }
-#else
- int errcode;
- char *buffer;
- target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
- MAX_PATH_SIZE - 1, &errcode);
- if (errcode != 0)
- error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
- safe_strerror (errcode));
- strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
- xfree (buffer);
- so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
-
- for (i = 0; i < lm->module_info.region_count; i++)
- {
- ldr_region_info_t region_info;
- CORE_ADDR region_offset;
-
- if (target_read_memory (lm->module_info.regioninfo_addr
- + i * sizeof (region_info),
- (char *) ®ion_info,
- sizeof (region_info)) != 0)
- break;
- region_offset = region_info.mapaddr - region_info.vaddr;
- if (i == 0)
- LM_OFFSET (so_list_ptr) = region_offset;
- else if (LM_OFFSET (so_list_ptr) != region_offset)
- {
- char *region_name;
- target_read_string (region_info.regionname_addr, &buffer,
- MAX_PATH_SIZE - 1, &errcode);
- if (errcode == 0)
- region_name = buffer;
- else
- region_name = "??";
- warning ("cannot handle shared library relocation for %s (%s)",
- so_list_ptr->so_name, region_name);
- xfree (buffer);
- }
- }
-#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.
-
- The arg and return value are "struct link_map" pointers, as defined
- in <link.h>.
- */
-
-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))
- {
- /* Get next link map structure from inferior image and build a local
- abbreviated load_map structure */
- new = (struct so_list *) xmalloc (sizeof (struct so_list));
- memset ((char *) new, 0, sizeof (struct so_list));
- new->lmaddr = lm;
- /* 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 (char *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].addr = text_addr;
- section_addrs.other[0].name = ".text";
- so->objfile = symbol_file_add (so->so_name, so->from_tty,
- §ion_addrs, 0, OBJF_SHARED);
- 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)
- {
- /* Add these section table entries to the target's table. */
-
- old = target_resize_to_sections (target, count);
-
- 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. */
- so = NULL;
- 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])
- {
- unsigned long txt_start = 0;
- unsigned long txt_end = 0;
-
- if (!header_done)
- {
- printf_unfiltered ("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
- "Shared Object Library");
- header_done++;
- }
- if (so->textsection)
- {
- txt_start = (unsigned long) so->textsection->addr;
- txt_end = (unsigned long) so->textsection->endaddr;
- }
- printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
- printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "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] && so->textsection)
- {
- if ((address >= (CORE_ADDR) so->textsection->addr) &&
- (address < (CORE_ADDR) so->textsection->endaddr))
- 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_list_head = next;
- }
-}
-
-/*
-
- 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 a statically bound executable, this first instruction is the
- one at "_start", or a similar text label. No further processing is
- needed in that case.
- For a dynamically bound executable, this first instruction is somewhere
- in the rld, and the actual user executable is not yet mapped in.
- We continue the inferior again, rld then maps in the actual user
- executable and any needed shared libraries and then sends
- itself a SIGTRAP.
- At that point we discover the names of all shared libraries and
- read their symbols in.
-
- FIXME
-
- This code does not properly handle hitting breakpoints which the
- user might have set in the rld itself. Proper handling would have
- to check if the SIGTRAP happened due to a kill call.
-
- Also, what if child has exit()ed? Must exit loop somehow.
- */
-
-void
-solib_create_inferior_hook (void)
-{
-
- /* Nothing to do for statically bound executables. */
-
- if (symfile_objfile == NULL
- || symfile_objfile->obfd == NULL
- || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0))
- return;
-
- /* Now run the target. It will eventually get a SIGTRAP, at
- which point all of the libraries will have been mapped in and we
- can go groveling around in the rld 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 (minus_one_ptid, 0, stop_signal);
- wait_for_inferior ();
- }
- while (stop_signal != TARGET_SIGNAL_TRAP);
-
- /* solib_add will call reinit_frame_cache.
- But we are stopped in the runtime loader and we do not have symbols
- for the runtime loader. So heuristic_proc_start will 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);
-}
projects / binutils-gdb.git / commitdiff