-/* Copyright (C) 1990 Free Software Foundation, Inc.
-
+/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
+ Copyright 1990, 1991 Free Software Foundation, Inc.
+
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-/*
-** symbol definitions
-*/
+
#include <sys/types.h>
+#include <signal.h>
#include <string.h>
#include <link.h>
#include <sys/param.h>
#include <fcntl.h>
#include <stdio.h>
+
#include "defs.h"
-#include "param.h"
#include "symtab.h"
#include "gdbcore.h"
#include "command.h"
#include "regex.h"
#include "inferior.h"
-extern char *getenv();
+extern char *getenv ();
+extern char *elf_interpreter (); /* Interpreter name from exec file */
+extern char *re_comp ();
+
+#define MAX_PATH_SIZE 256 /* FIXME: Should be dynamic */
+
+/* On SVR4 systems, for the initial implementation, use main() as the
+ "startup mapping complete" breakpoint address. The models for SunOS
+ and SVR4 dynamic linking debugger support are different in that SunOS
+ hits one breakpoint when all mapping is complete while using the SVR4
+ debugger support takes two breakpoint hits for each file mapped, and
+ there is no way to know when the "last" one is hit. Both these
+ mechanisms should be tied to a "breakpoint service routine" that
+ gets automatically executed whenever one of the breakpoints indicating
+ a change in mapping is hit. This is a future enhancement. (FIXME) */
+
+#define BKPT_AT_MAIN 1
+
+/* local data declarations */
+
+#ifdef sun
+
+#define DEBUG_BASE "_DYNAMIC"
+#define LM_ADDR(so) ((so) -> lm.lm_addr)
+#define LM_NEXT(so) ((so) -> lm.lm_next)
+#define LM_NAME(so) ((so) -> lm.lm_name)
+static struct link_dynamic dynamic_copy;
+static struct link_dynamic_2 ld_2_copy;
+static struct ld_debug debug_copy;
+static CORE_ADDR debug_addr;
+static CORE_ADDR flag_addr;
+
+#else /* !sun */
+
+#define DEBUG_BASE "_r_debug"
+#define LM_ADDR(so) ((so) -> lm.l_addr)
+#define LM_NEXT(so) ((so) -> lm.l_next)
+#define LM_NAME(so) ((so) -> lm.l_name)
+static struct r_debug debug_copy;
+static CORE_ADDR shlib_base; /* Base address of shared library */
+char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
+extern CORE_ADDR proc_base_address ();
+extern int proc_address_to_fd ();
+
+#endif /* sun */
-/*
-** local data declarations
-*/
-#define MAX_PATH_SIZE 256
struct so_list {
- struct link_map inferior_lm; /* inferior link map */
- struct link_map *inferior_lm_add;
- long ld_text;
- char inferior_so_name[MAX_PATH_SIZE]; /* Shared Object Library Name */
- struct so_list *next; /* Next Structure */
- char symbols_loaded; /* Flag: loaded? */
- char from_tty; /* Flag: print msgs? */
- bfd *so_bfd;
- struct section_table *sections;
- struct section_table *sections_end;
+ 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? */
+ bfd *so_bfd; /* bfd for so_name */
+ struct section_table *sections;
+ struct section_table *sections_end;
};
-static struct so_list *so_list_head = 0;
+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 */
+
/*
-** Build a section map for a shared library, record its text size in
-** the so_list structure and set up the text section of the shared lib.
-*/
+
+LOCAL FUNCTION
+
+ solib_map_sections -- open bfd and build sections for shared lib
+
+SYNOPSIS
+
+ static void 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 void
-solib_map_sections(so)
-struct so_list *so;
+solib_map_sections (so)
+ struct so_list *so;
{
char *filename;
char *scratch_pathname;
int scratch_chan;
struct section_table *p;
- filename = tilde_expand (so->inferior_so_name);
+ filename = tilde_expand (so -> so_name);
make_cleanup (free, filename);
scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
- &scratch_pathname);
+ &scratch_pathname);
if (scratch_chan < 0)
- scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename, O_RDONLY, 0,
- &scratch_pathname);
+ {
+ scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
+ O_RDONLY, 0, &scratch_pathname);
+ }
if (scratch_chan < 0)
- perror_with_name (filename);
-
- so->so_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
- if (!so->so_bfd)
- error ("Could not open `%s' as an executable file: %s",
- scratch_pathname, bfd_errmsg (bfd_error));
- if (!bfd_check_format (so->so_bfd, bfd_object))
- error ("\"%s\": not in executable format: %s.",
- scratch_pathname, bfd_errmsg (bfd_error));
- if (build_section_table (so->so_bfd, &so->sections, &so->sections_end))
- error ("Can't find the file sections in `%s': %s",
- exec_bfd->filename, bfd_errmsg (bfd_error));
-
- for (p = so->sections; p < so->sections_end; p++)
- {
- if (strcmp (bfd_section_name (so->so_bfd, p->sec_ptr), ".text") == 0)
+ {
+ perror_with_name (filename);
+ }
+
+ so -> so_bfd = bfd_fdopenr (scratch_pathname, NULL, scratch_chan);
+ if (!so -> so_bfd)
+ {
+ error ("Could not open `%s' as an executable file: %s",
+ scratch_pathname, bfd_errmsg (bfd_error));
+ }
+ if (!bfd_check_format (so -> so_bfd, bfd_object))
+ {
+ error ("\"%s\": not in executable format: %s.",
+ scratch_pathname, bfd_errmsg (bfd_error));
+ }
+ if (build_section_table (so -> so_bfd, &so -> sections, &so -> sections_end))
+ {
+ error ("Can't find the file sections in `%s': %s",
+ exec_bfd -> filename, bfd_errmsg (bfd_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 base address to which the object was actually
+ mapped. */
+ p -> addr += (CORE_ADDR) LM_ADDR (so);
+ p -> endaddr += (CORE_ADDR) LM_ADDR (so);
+ so -> lmend = (CORE_ADDR) max (p -> endaddr, so -> lmend);
+ }
+}
+
+/*
+
+LOCAL FUNCTION
+
+ bfd_lookup_symbol -- lookup the value for a specific symbol
+
+SYNOPSIS
+
+ CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
+
+DESCRIPTION
+
+ An expensive way to lookup the value of a single symbol for
+ bfd's that are only temporary anyway. This is used by the
+ shared library support to find the address of the debugger
+ interface structures in the shared library.
+
+ Note that 0 is specifically allowed as an error return (no
+ such symbol).
+
+ FIXME: See if there is a less "expensive" way of doing this.
+ Also see if there is already another bfd or gdb function
+ that specifically does this, and if so, use it.
+*/
+
+static CORE_ADDR
+DEFUN (bfd_lookup_symbol, (abfd, symname),
+ bfd *abfd AND
+ char *symname)
+{
+ unsigned int storage_needed;
+ asymbol *sym;
+ asymbol **symbol_table;
+ unsigned int number_of_symbols;
+ unsigned int i;
+ struct cleanup *back_to;
+ CORE_ADDR symaddr = 0;
+ enum misc_function_type mf_type;
+
+ storage_needed = get_symtab_upper_bound (abfd);
+
+ if (storage_needed > 0)
+ {
+ symbol_table = (asymbol **) bfd_xmalloc (storage_needed);
+ back_to = make_cleanup (free, symbol_table);
+ number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+
+ for (i = 0; i < number_of_symbols; i++)
{
- /* Determine length of text section and relocate it. */
- so->ld_text = p->endaddr - p->addr;
- p->addr += (CORE_ADDR)so->inferior_lm.lm_addr;
- p->endaddr += (CORE_ADDR)so->inferior_lm.lm_addr;
+ sym = *symbol_table++;
+ if (strcmp (sym -> name, symname) == 0)
+ {
+ symaddr = sym -> value;
+ break;
+ }
}
- else
- /* All other sections are ignored for now. */
- p->addr = p->endaddr = 0;
+ do_cleanups (back_to);
}
+ return (symaddr);
}
-/*=======================================================================*/
-
-/* find_solib
-**
-**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>.
-**
-** NOTE: This only works under SunOS4.0.
-*/
+/*
+
+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, and 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 misc function vector at the time the symbol
+ file's symbols were read.
+
+ The SVR4 version is much more complicated because the dynamic linker
+ and it's structures are located in the shared library itself, which
+ gets run as the executable's "interpreter" by the kernel. Because
+ of this complexity, we cache the value we find and return that value
+ on subsequent invocations, if it is non-zero.
+
+ First we must decide if we are stopped at the entry point of the
+ shared C library, which is set to be the entry point of the dynamic
+ linker code (the function _rt_boot() to be precise), or at the entry
+ point given in the inferior's exec file (for statically linked
+ executables).
+
+ If we are not stopped at the inferior's exec file entry point then
+ we are either stopped at the interpreter's entry point or somewhere
+ else (I.E. totally lost). Use the /proc interface to get an open
+ file descriptor on the file that is mapped at the current stop_pc
+ value and try to open a bfd for it.
+
+FIXME
+
+ The SVR4 strategy does NOT work when gdb is attaching to an existing
+ process because the stop_pc is not in the library code, so we can't
+ use the /proc interface to get an open fd for the library. So we
+ need to rethink the method for finding the debugger interface struct.
+
+ For SunOS we could look around in the executable code to find
+ DEBUG_BASE, if it isn't in the symbol table. It's not that hard to
+ find. Then we can debug stripped executables using shared library
+ symbols.
+
+ */
+
+static CORE_ADDR
+locate_base ()
+{
+ CORE_ADDR address;
+
+#ifdef sun
+
+ int i;
+
+ i = lookup_misc_func (DEBUG_BASE);
+ if (i >= 0 && misc_function_vector[i].address != 0)
+ {
+ address = misc_function_vector[i].address;
+ }
+
+#else /* !sun */
+
+ int stop_pc_fd; /* File descriptor for mapped file */
+ int interp_fd; /* File descriptor for interpreter */
+ char *interp_name; /* Name of interpreter */
+ char *full_interp_name; /* Full pathname of interpreter */
+ bfd *interp_bfd;
+ CORE_ADDR interp_base;
+
+ if (debug_base > 0)
+ {
+ /* We have a currently valid address, so avoid doing all the work
+ again. */
+ return (debug_base);
+ }
+ if (bfd_get_start_address (exec_bfd) == stop_pc)
+ {
+ /* We are stopped at the entry point to the exec file, so there
+ are no shared libs to deal with. */
+ return (0);
+ }
+ if ((stop_pc_fd = proc_address_to_fd (stop_pc)) < 0)
+ {
+ /* We are stopped at an address for which we can't seem to get an open
+ file descriptor from the /proc interface. We should already have
+ printed a suitable warning message. */
+ return (0);
+ }
+ if ((interp_name = elf_interpreter (exec_bfd)) == NULL)
+ {
+ /* There is no interpreter specified in the exec file, thus this is
+ not a normal dynamically linked file. */
+ return (0);
+ }
+ if ((interp_fd = openp (getenv ("PATH"), 1, interp_name, O_RDONLY, 0,
+ &full_interp_name)) < 0)
+ {
+ /* We can't find and open the interpreter. This is a problem. */
+ return (0);
+ }
+ if (!fdmatch (stop_pc_fd, interp_fd))
+ {
+ /* The file for the mapped region is not the interpreter, something
+ is strange... */
+ close (stop_pc_fd);
+ close (interp_fd);
+ free (full_interp_name);
+ return (0);
+ }
+ interp_bfd = bfd_fdopenr (full_interp_name, NULL, interp_fd);
+ if (!interp_bfd)
+ {
+ warning ("Could not open `%s' as an executable file: %s",
+ full_interp_name, bfd_errmsg (bfd_error));
+ return (0);
+ }
+ if (!bfd_check_format (interp_bfd, bfd_object))
+ {
+ warning ("\"%s\": not in executable format: %s.",
+ full_interp_name, bfd_errmsg (bfd_error));
+ return (0);
+ }
+
+ /* Lookup the unrelocated value of the symbol that defines the location
+ of the debugger interface structure for the dynamic linker in the shared
+ library. Then find the base address of the text segment in the
+ inferior's mapped in dynamic library, which gives the relocation to
+ apply to find the actual mapped address of the debugger interface
+ structure. */
+
+ if ((address = bfd_lookup_symbol (interp_bfd, DEBUG_BASE)) == 0)
+ {
+ warning ("can't find symbol %s in shared library", DEBUG_BASE);
+ return (0);
+ }
+ if ((interp_base = proc_base_address (stop_pc)) == 0)
+ {
+ warning ("can't find base address for shared library text segment");
+ return (0);
+ }
+ shlib_base = interp_base;
+ address += interp_base;
+
+ if ((interp_base + bfd_get_start_address (interp_bfd)) != stop_pc)
+ {
+ /* We are not stopped at the entry point to the dynamic linker,
+ so grumble and skip startup shared library processing. */
+ warning ("not stopped at entry point of dynamic linker");
+ warning ("shared library processing suppressed");
+ return (0);
+ }
+
+ bfd_close (interp_bfd);
+
+#endif /* sun */
+
+ return (address);
+
+}
-struct so_list *find_solib(so_list_ptr)
-struct so_list *so_list_ptr; /* so_list_head position ptr */
+static struct link_map *
+first_link_map_member ()
{
-struct so_list *so_list_next = 0;
-struct link_map *inferior_lm = 0;
-struct link_dynamic inferior_dynamic_cpy;
-struct link_dynamic_2 inferior_ld_2_cpy;
-struct so_list *new;
-int i;
-
- if (!so_list_ptr) {
- if (!(so_list_next = so_list_head)) {
- i = lookup_misc_func ("_DYNAMIC");
- if (i >= 0) {
- read_memory(misc_function_vector[i].address,
- &inferior_dynamic_cpy,
- sizeof(struct link_dynamic));
- if (inferior_dynamic_cpy.ld_version == 3) {
- read_memory((CORE_ADDR)inferior_dynamic_cpy.ld_un.ld_2,
- &inferior_ld_2_cpy,
- sizeof(struct link_dynamic_2));
- inferior_lm = inferior_ld_2_cpy.ld_loaded;
- }
- }
- }
- } else {
- /*
- ** Advance to next local abbreviated load_map structure
- */
- if (!(inferior_lm = so_list_ptr->inferior_lm.lm_next)) {
- /* See if any were added, but be quiet if we can't read
- from the target any more. */
- int status;
-
- status = target_read_memory (
- (CORE_ADDR)so_list_ptr->inferior_lm_add,
- (char *)&so_list_ptr->inferior_lm,
- sizeof(struct link_map));
- if (status == 0)
- inferior_lm = so_list_ptr->inferior_lm.lm_next;
- else
- inferior_lm = 0;
- }
- so_list_next = so_list_ptr->next;
- }
- if ((!so_list_next) && inferior_lm) {
- /*
- ** Get Next LM Structure from inferior image and build
- ** an local abbreviated load_map structure
- */
- new = (struct so_list *) xmalloc(sizeof(struct so_list));
- new->inferior_lm_add = inferior_lm;
- read_memory((CORE_ADDR)inferior_lm,
- &new->inferior_lm,
- sizeof(struct link_map));
-
- read_memory((CORE_ADDR)new->inferior_lm.lm_name,
- new->inferior_so_name,
- MAX_PATH_SIZE - 1);
- new->inferior_so_name[MAX_PATH_SIZE - 1] = 0;
- /* Zero everything after the first terminating null */
- strncpy(new->inferior_so_name, new->inferior_so_name, MAX_PATH_SIZE);
-
-#if 0
- /* This doesn't work for core files, so instead get ld_text
- using solib_map_sections (below). */
- read_memory((CORE_ADDR)new->inferior_lm.lm_ld,
- &inferior_dynamic_cpy,
- sizeof(struct link_dynamic));
- read_memory((CORE_ADDR)inferior_dynamic_cpy.ld_un.ld_2,
- &inferior_ld_2_cpy,
- sizeof(struct link_dynamic_2));
- new->ld_text = inferior_ld_2_cpy.ld_text;
+ struct link_map *lm = NULL;
+
+#ifdef sun
+
+ read_memory (debug_base, &dynamic_copy, sizeof (dynamic_copy));
+ if (dynamic_copy.ld_version >= 2)
+ {
+ /* It is a version that we can deal with, so read in the secondary
+ structure and find the address of the link map list from it. */
+ read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, &ld_2_copy,
+ sizeof (struct link_dynamic_2));
+ lm = ld_2_copy.ld_loaded;
+ }
+
+#else
+
+ read_memory (debug_base, &debug_copy, sizeof (struct r_debug));
+ lm = debug_copy.r_map;
+
#endif
- new->next = 0;
- new->symbols_loaded = 0;
- new->so_bfd = NULL;
- new->sections = NULL;
- if (so_list_ptr)
- so_list_ptr->next = new;
- else
- so_list_head = new;
+ return (lm);
+}
+
+/*
+
+GLOBAL 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.
- solib_map_sections (new);
+ The arg and return value are "struct link_map" pointers, as defined
+ in <link.h>.
+ */
- so_list_next = new;
- }
- return(so_list_next);
+struct so_list *
+find_solib (so_list_ptr)
+ struct so_list *so_list_ptr; /* Last lm or NULL for first one */
+{
+ 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)
+ {
+ /* 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)
+ {
+ /* Read the base structure in and find the address of 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. */
+ if ((lm = LM_NEXT (so_list_ptr)) == NULL)
+ {
+ /* 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 = target_read_memory ((CORE_ADDR) so_list_ptr -> lmaddr,
+ (char *) &(so_list_ptr -> lm),
+ sizeof (struct link_map));
+ if (status == 0)
+ {
+ lm = LM_NEXT (so_list_ptr);
+ }
+ else
+ {
+ lm = NULL;
+ }
+ }
+ 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));
+ (void) 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;
+ read_memory ((CORE_ADDR) lm, &(new -> lm), sizeof (struct link_map));
+ /* For the SVR4 version, there is one entry that has no name
+ (for the inferior executable) since it is not a shared object. */
+ if (LM_NAME (new) != 0)
+ {
+ read_memory((CORE_ADDR) LM_NAME (new), new -> so_name,
+ MAX_PATH_SIZE - 1);
+ new -> so_name[MAX_PATH_SIZE - 1] = 0;
+ solib_map_sections (new);
+ }
+ }
+ return (so_list_next);
}
/* A small stub to get us past the arg-passing pinhole of catch_errors. */
symbol_add_stub (arg)
char *arg;
{
- register struct so_list *so = (struct so_list *)arg; /* catch_errs bogon */
-
- symbol_file_add (so->inferior_so_name, so->from_tty,
- (unsigned int)so->inferior_lm.lm_addr, 0);
- return 1;
+ register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
+
+ symbol_file_add (so -> so_name, so -> from_tty,
+ (unsigned int) LM_ADDR (so), 0);
+ return (1);
}
-/* The real work of adding a shared library file to the symtab and
- the section list. */
+/*
+
+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)
+
+DESCRIPTION
+
+*/
void
solib_add (arg_string, from_tty, target)
int from_tty;
struct target_ops *target;
{
- register struct so_list *so = 0; /* link map state variable */
- char *val;
- int count, old;
- struct section_table *sec;
-
- if (arg_string == 0)
- re_comp (".");
- else if (val = (char *) re_comp (arg_string)) {
- error ("Invalid regexp: %s", val);
- }
-
+ register struct so_list *so = NULL; /* link map state variable */
+ char *re_err;
+ int count;
+ int old;
+
+ if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
+ {
+ error ("Invalid regexp: %s", re_err);
+ }
+
/* Getting new symbols may change our opinion about what is
frameless. */
reinit_frame_cache ();
-
- if (from_tty) {
- printf_filtered ("Shared libraries");
- if (arg_string)
- printf_filtered (" matching regular expresion \"%s\"", arg_string);
- printf_filtered (":\n");
- }
- dont_repeat();
-
- while (so = find_solib(so)) {
- if (re_exec(so->inferior_so_name)) {
- if (so->symbols_loaded) {
+ while ((so = find_solib (so)) != NULL)
+ {
+ if (so -> so_name[0] && re_exec (so -> so_name))
+ {
+ if (so -> symbols_loaded)
+ {
if (from_tty)
- printf("Symbols already loaded for %s\n", so->inferior_so_name);
- } else {
- so->symbols_loaded = 1;
- so->from_tty = from_tty;
- catch_errors (symbol_add_stub, (char *)so,
- "Error while reading shared library symbols:\n");
- }
- }
- }
-
+ {
+ printf ("Symbols already loaded for %s\n", so -> so_name);
+ }
+ }
+ else
+ {
+ so -> symbols_loaded = 1;
+ so -> from_tty = from_tty;
+ catch_errors (symbol_add_stub, (char *) so,
+ "Error while reading shared library symbols:\n");
+ }
+ }
+ }
+
/* Now 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 = 0;
- count = 0;
- while (0 != (so = find_solib (so))) {
- count += so->sections_end - so->sections;
- }
-
- if (count) {
- /* Reallocate the target's section table including the new size. */
- if (target->sections) {
- old = target->sections_end - target->sections;
- target->sections = (struct section_table *)
- realloc ((char *)target->sections,
- (sizeof (struct section_table)) * (count + old));
- } else {
- old = 0;
- target->sections = (struct section_table *)
- malloc ((sizeof (struct section_table)) * count);
- }
- target->sections_end = target->sections + (count + old);
-
- /* Add these section table entries to the target's table. */
- while (0 != (so = find_solib (so))) {
- count = so->sections_end - so->sections;
- bcopy (so->sections, (char *)(target->sections + old),
- (sizeof (struct section_table)) * count);
- old += count;
- }
- }
- }
+ 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)
+ {
+ /* Reallocate the target's section table including the new size. */
+ if (target -> sections)
+ {
+ old = target -> sections_end - target -> sections;
+ target -> sections = (struct section_table *)
+ realloc ((char *)target -> sections,
+ (sizeof (struct section_table)) * (count + old));
+ }
+ else
+ {
+ old = 0;
+ target -> sections = (struct section_table *)
+ malloc ((sizeof (struct section_table)) * count);
+ }
+ target -> sections_end = target -> sections + (count + old);
+
+ /* 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;
+ bcopy (so -> sections, (char *)(target -> sections + old),
+ (sizeof (struct section_table)) * count);
+ old += count;
+ }
+ }
+ }
+ }
}
-/*=======================================================================*/
+/*
-static void solib_info()
-{
-register struct so_list *so = 0; /* link map state variable */
+LOCAL FUNCTION
+
+ info_sharedlibrary_command -- code for "info sharedlibrary"
+
+SYNOPSIS
+
+ static void info_sharedlibrary_command ()
+
+DESCRIPTION
- while (so = find_solib(so)) {
- if (so == so_list_head) {
- printf(" Address Range Syms Read Shared Object Library\n");
+ Walk through the shared library list and print information
+ about each attached library.
+*/
+
+static void
+info_sharedlibrary_command ()
+{
+ register struct so_list *so = NULL; /* link map state variable */
+ int header_done = 0;
+
+ if (exec_bfd == NULL)
+ {
+ printf ("No exec file.\n");
+ return;
+ }
+ while ((so = find_solib (so)) != NULL)
+ {
+ if (so -> so_name[0])
+ {
+ if (!header_done)
+ {
+ printf("%-12s%-12s%-12s%s\n", "From", "To", "Syms Read",
+ "Shared Object Library");
+ header_done++;
+ }
+ printf ("%-12s", local_hex_string_custom (LM_ADDR (so), "08"));
+ printf ("%-12s", local_hex_string_custom (so -> lmend, "08"));
+ printf ("%-12s", so -> symbols_loaded ? "Yes" : "No");
+ printf ("%s\n", so -> so_name);
}
- printf(" 0x%08x - 0x%08x %s %s\n",
- so->inferior_lm.lm_addr,
- so->inferior_lm.lm_addr + so->ld_text - 1,
- (so->symbols_loaded ? "Yes" : "No "),
- so->inferior_so_name);
}
- if (!so_list_head) {
- printf("No shared libraries loaded at this time.\n");
+ if (so_list_head == NULL)
+ {
+ printf ("No shared libraries loaded at this time.\n");
}
}
/*
-** Called by Insert Breakpoint to see if Address is Shared Library Address
-*/
+
+GLOBAL FUNCTION
+
+ solib_address -- check to see if an address is in a shared lib
+
+SYNOPSIS
+
+ int 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.
+ */
+
int
-solib_address(address)
+solib_address (address)
CORE_ADDR address;
{
-register struct so_list *so = 0; /* link map state variable */
+ 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 (1);
+ }
+ }
+ }
+ return (0);
+}
+
+/* Called by free_all_symtabs */
- while (so = find_solib(so)) {
- if ((address >= (CORE_ADDR) so->inferior_lm.lm_addr) &&
- (address < (CORE_ADDR) so->inferior_lm.lm_addr + so->ld_text))
- return 1;
+void
+clear_solib()
+{
+ struct so_list *next;
+
+ while (so_list_head)
+ {
+ if (so_list_head -> sections)
+ {
+ free (so_list_head -> sections);
+ }
+ if (so_list_head -> so_bfd)
+ {
+ bfd_close (so_list_head -> so_bfd);
+ }
+ next = so_list_head -> next;
+ free(so_list_head);
+ so_list_head = next;
}
- return 0;
+ debug_base = 0;
}
/*
-** Called by free_all_symtabs
+
+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.
+
*/
-void
-clear_solib()
+
+static int
+disable_break ()
{
-struct so_list *next;
-
- while (so_list_head) {
- if (so_list_head->sections)
- free (so_list_head->sections);
- if (so_list_head->so_bfd)
- bfd_close (so_list_head->so_bfd);
- next = so_list_head->next;
- free(so_list_head);
- so_list_head = next;
- }
+ int status = 1;
+
+#ifdef sun
+
+ /* FIXME: maybe we should add the common symbols from the ldd_cp chain
+ to the misc_function_vector ? */
+
+ int in_debugger = 0;
+
+ /* Set `in_debugger' to zero now. */
+
+ write_memory (flag_addr, &in_debugger, sizeof (in_debugger));
+
+ /* Read the debugger structure from the inferior to retrieve the
+ address of the breakpoint and the original contents of the
+ breakpoint address. Remove the breakpoint by writing the original
+ contents back. */
+
+ read_memory (debug_addr, &debug_copy, sizeof (debug_copy));
+ breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr;
+ write_memory (breakpoint_addr, &debug_copy.ldd_bp_inst,
+ sizeof (debug_copy.ldd_bp_inst));
+
+#else /* !sun */
+
+ /* 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;
+ }
+
+#endif /* sun */
+
+ /* 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);
}
-/* Called by child_create_inferior when the inferior is stopped at its
- first instruction. */
+/*
-void
-solib_create_inferior_hook()
+LOCAL FUNCTION
+
+ enable_break -- arrange for dynamic linker to hit breakpoint
+
+SYNOPSIS
+
+ int enable_break (void)
+
+DESCRIPTION
+
+ Both the SunOS and the SVR4 dynamic linkers have, as part of their
+ debugger interface, support for arranging for the inferior to hit
+ a breakpoint after mapping in the shared libraries. This function
+ enables that breakpoint.
+
+ For SunOS, there is a special flag location (in_debugger) which we
+ set to 1. When the dynamic linker sees this flag set, it will set
+ a breakpoint at a location known only to itself, after saving the
+ original contents of that place and the breakpoint address itself,
+ in it's own internal structures. When we resume the inferior, it
+ will eventually take a SIGTRAP when it runs into the breakpoint.
+ We handle this (in a different place) by restoring the contents of
+ the breakpointed location (which is only known after it stops),
+ chasing around to locate the shared libraries that have been
+ loaded, then resuming.
+
+ For SVR4, the debugger interface structure contains a member (r_brk)
+ which is statically initialized at the time the shared library is
+ built, to the offset of a function (_r_debug_state) which is guaran-
+ teed to be called once before mapping in a library, and again when
+ the mapping is complete. At the time we are examining this member,
+ it contains only the unrelocated offset of the function, so we have
+ to do our own relocation. Later, when the dynamic linker actually
+ runs, it relocates r_brk to be the actual address of _r_debug_state().
+
+ The debugger interface structure also contains an enumeration which
+ is set to either RT_ADD or RT_DELETE prior to changing the mapping,
+ depending upon whether or not the library is being mapped or unmapped,
+ and then set to RT_CONSISTENT after the library is mapped/unmapped.
+*/
+
+static int
+enable_break ()
{
- struct link_dynamic inferior_dynamic_cpy;
- CORE_ADDR inferior_debug_addr;
- struct ld_debug inferior_debug_cpy;
- int in_debugger;
- CORE_ADDR in_debugger_addr;
- CORE_ADDR breakpoint_addr;
- int i, j;
- /* FIXME: We should look around in the executable code to find _DYNAMIC,
- if it isn't in the symbol table. It's not that hard to find...
- Then we can debug stripped executables using shared library symbols. */
- i = lookup_misc_func ("_DYNAMIC");
- if (i < 0) /* Can't find shared lib ptr. */
- return;
- if (misc_function_vector[i].address == 0) /* statically linked program */
- return;
+ int j;
+
+#ifdef sun
+ int in_debugger;
+
/* Get link_dynamic structure */
- j = target_read_memory(misc_function_vector[i].address,
- &inferior_dynamic_cpy,
- sizeof(struct link_dynamic));
- if (j) /* unreadable */
- return;
+
+ j = target_read_memory (debug_base, (char *) &dynamic_copy,
+ sizeof (dynamic_copy));
+ if (j)
+ {
+ /* unreadable */
+ return (0);
+ }
/* Calc address of debugger interface structure */
- inferior_debug_addr = (CORE_ADDR)inferior_dynamic_cpy.ldd;
+
+ debug_addr = (CORE_ADDR) dynamic_copy.ldd;
+
/* Calc address of `in_debugger' member of debugger interface structure */
- in_debugger_addr = inferior_debug_addr + (CORE_ADDR)((char *)&inferior_debug_cpy.ldd_in_debugger - (char *)&inferior_debug_cpy);
+
+ flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
+ (char *) &debug_copy);
+
/* Write a value of 1 to this member. */
+
in_debugger = 1;
- write_memory(in_debugger_addr, &in_debugger, sizeof(in_debugger));
- /* Now run the target. Seeing `in_debugger' set, it will set a
- breakpoint at some convenient place, remember the original contents
- of that place, and eventually take a SIGTRAP when it runs into the
- breakpoint. We handle this by restoring the contents of the
- breakpointed location (which is only known after it stops),
- chasing around to locate the shared libraries that have been
- loaded, then resuming. */
+ write_memory (flag_addr, &in_debugger, sizeof (in_debugger));
+
+#else /* !sun */
+
+#ifdef BKPT_AT_MAIN
+
+ int i;
+
+ i = lookup_misc_func ("main");
+ if (i >= 0 && misc_function_vector[i].address != 0)
+ {
+ breakpoint_addr = misc_function_vector[i].address;
+ }
+ else
+ {
+ return (0);
+ }
+
+ if (target_insert_breakpoint (breakpoint_addr, shadow_contents) != 0)
+ {
+ return (0);
+ }
+
+#else /* !BKPT_AT_MAIN */
+
+ struct symtab_and_line sal;
+
+ /* Read the debugger interface structure directly. */
+
+ read_memory (debug_base, (char *) &debug_copy, sizeof (debug_copy));
+
+ /* Set breakpoint at the debugger interface stub routine that will
+ be called just prior to each mapping change and again after the
+ mapping change is complete. Set up the (nonexistent) handler to
+ deal with hitting these breakpoints. (FIXME). */
+
+ warning ("'%s': line %d: missing SVR4 support code", __FILE__, __LINE__);
+
+#endif /* BKPT_AT_MAIN */
+
+#endif /* sun */
+
+ return (1);
+}
+
+/*
+
+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 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()
+{
+ CORE_ADDR debug_addr;
+ int in_debugger;
+ CORE_ADDR in_debugger_addr;
+ CORE_ADDR breakpoint_addr;
+ int i, j;
+
+ if ((debug_base = locate_base ()) == 0)
+ {
+ /* Can't find the symbol or the executable is statically linked. */
+ return;
+ }
+
+ 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;
- target_resume (0, 0);
- wait_for_inferior ();
- while (stop_signal != SIGTRAP)
+ stop_signal = 0;
+ do
{
- /* FIXME, what if child has exit()ed? Must exit loop somehow */
target_resume (0, stop_signal);
wait_for_inferior ();
}
+ while (stop_signal != SIGTRAP);
stop_soon_quietly = 0;
+
+ /* 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. */
- /* Set `in_debugger' to zero now. WHY, is this needed? */
- in_debugger = 0;
- write_memory(in_debugger_addr, &in_debugger, sizeof(in_debugger));
- read_memory(inferior_debug_addr, &inferior_debug_cpy, sizeof(inferior_debug_cpy));
- /* FIXME: maybe we should add the common symbols from the ldd_cp chain
- * to the misc_function_vector ?
- */
- breakpoint_addr = (CORE_ADDR)inferior_debug_cpy.ldd_bp_addr;
- if (stop_pc - DECR_PC_AFTER_BREAK == breakpoint_addr)
- {
- write_memory(breakpoint_addr, &inferior_debug_cpy.ldd_bp_inst, sizeof(inferior_debug_cpy.ldd_bp_inst));
- if (DECR_PC_AFTER_BREAK)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- }
- }
- solib_add ((char *)0, 0, (struct target_ops *)0);
+ 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 ((char *) 0, 0, (struct target_ops *) 0);
}
+/*
+
+GLOBAL FUNCTION
+
+ sharedlibrary_command -- handle command to explicitly add library
+
+SYNOPSIS
+
+ void sharedlibrary_command (char *args, int from_tty)
+
+DESCRIPTION
+
+*/
+
void
sharedlibrary_command (args, from_tty)
+char *args;
+int from_tty;
{
- solib_add (args, from_tty, (struct target_ops *)0);
+ dont_repeat ();
+ solib_add (args, from_tty, (struct target_ops *) 0);
}
void
_initialize_solib()
{
-
- add_com("sharedlibrary", class_files, sharedlibrary_command,
+
+ add_com ("sharedlibrary", class_files, sharedlibrary_command,
"Load shared object library symbols for files matching REGEXP.");
- add_info("sharedlibrary", solib_info,
- "Status of loaded shared object libraries");
+ add_info ("sharedlibrary", info_sharedlibrary_command,
+ "Status of loaded shared object libraries.");
}
projects / binutils-gdb.git / commitdiff