/* Handle HP SOM shared libraries for GDB, the GNU Debugger.
Copyright 1993 Free Software Foundation, Inc.
-
+
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
#include "symfile.h"
#include "objfiles.h"
#include "inferior.h"
+#include "gdb-stabs.h"
+
+/* TODO:
+
+ * Most of this code should work for hp300 shared libraries. Does
+ anyone care enough to weed out any SOM-isms.
+
+ * Do we need/want a command to load a shared library?
+
+ * Support for hpux8 dynamic linker.
-/* We don't currently use this structure, but it isn't documented anywhere,
- and we'll likely need it in som_solib_add as more shared library support
- is added. */
+ * Support for tracking user calls to dld_load, dld_unload. */
+
+/* The basic structure which describes a dynamically loaded object. This
+ data structure is private to the dynamic linker and isn't found in
+ any HPUX include file. */
struct som_solib_mapped_entry
{
/* The name of the library. */
char *name;
- /* Version of this structure (it is expected to change again in hpux10. */
+ /* Version of this structure (it is expected to change again in hpux10). */
unsigned char struct_version;
/* Binding mode for this library. */
contained in them. */
};
+/* A structure to keep track of all the known shared objects. */
+struct so_list
+{
+ struct som_solib_mapped_entry som_solib;
+ struct objfile *objfile;
+ bfd *abfd;
+ struct section_table *sections;
+ struct section_table *sections_end;
+ struct so_list *next;
+};
+
+static struct so_list *so_list_head;
+
+static void som_sharedlibrary_info_command PARAMS ((char *, int));
+
/* Add symbols from shared libraries into the symtab list. */
void
char *arg_string;
int from_tty;
struct target_ops *target;
-{
+{
struct minimal_symbol *msymbol;
+ struct so_list *so_list_tail;
CORE_ADDR addr;
+ asection *shlib_info;
int status;
unsigned int dld_flags;
- char buf[4];
+ char buf[4], *re_err;
+
+ /* First validate our arguments. */
+ if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
+ {
+ error ("Invalid regexp: %s", re_err);
+ }
/* If we're debugging a core file, or have attached to a running
process, then som_solib_create_inferior_hook will not have been
called.
- We need to examine __dld_flags to determine if the shared library
- list is valid, and to determine if the libraries have been privately
+ We need to first determine if we're dealing with a dynamically
+ linked executable. If not, then return without an error or warning.
+
+ We also need to examine __dld_flags to determine if the shared library
+ list is valid and to determine if the libraries have been privately
mapped. */
- msymbol = lookup_minimal_symbol ("__dld_flags", (struct objfile *) NULL);
+ if (symfile_objfile == NULL)
+ return;
+
+ /* First see if the objfile was dynamically linked. */
+ shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
+ if (!shlib_info)
+ return;
+
+ /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
+ if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0)
+ return;
+
+ msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
if (msymbol == NULL)
{
error ("Unable to find __dld_flags symbol in object file.\n");
/* If the libraries were not mapped private, warn the user. */
if ((dld_flags & 1) == 0)
- warning ("The shared libraries were not privately mapped;\nsetting a breakpoint in a shared library will not work.\n");
+ warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n");
- msymbol = lookup_minimal_symbol ("__dld_list", (struct objfile *) NULL);
+ msymbol = lookup_minimal_symbol ("__dld_list", NULL, NULL);
if (!msymbol)
{
/* Older crt0.o files (hpux8) don't have __dld_list as a symbol,
but the data is still available if you know where to look. */
- msymbol = lookup_minimal_symbol ("__dld_flags", (struct objfile *)NULL);
+ msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
if (!msymbol)
{
error ("Unable to find dynamic library list.\n");
addr = extract_unsigned_integer (buf, 4);
/* Now that we have a pointer to the dynamic library list, walk
- through it and add the symbols for each library.
+ through it and add the symbols for each library. */
- Skip the first entry since it's our executable. */
- status = target_read_memory (addr + 36, buf, 4);
- if (status != 0)
- {
- error ("Error while reading dynamic library list.\n");
- return;
- }
- addr = extract_unsigned_integer (buf, 4);
+ so_list_tail = so_list_head;
+ /* Find the end of the list of shared objects. */
+ while (so_list_tail && so_list_tail->next)
+ so_list_tail = so_list_tail->next;
while (1)
{
CORE_ADDR name_addr, text_addr;
unsigned int name_len;
char *name;
+ struct so_list *new_so;
+ struct so_list *so_list = so_list_head;
+ struct section_table *p;
+
if (addr == 0)
break;
/* Get a pointer to the name of this library. */
status = target_read_memory (addr, buf, 4);
if (status != 0)
- {
- error ("Error while reading dynamic library list.\n");
- return;
- }
+ goto err;
+
name_addr = extract_unsigned_integer (buf, 4);
name_len = 0;
while (1)
{
target_read_memory (name_addr + name_len, buf, 1);
if (status != 0)
- {
- error ("Error while reading dynamic library list.\n");
- return;
- }
+ goto err;
+
name_len++;
if (*buf == '\0')
break;
name = alloca (name_len);
status = target_read_memory (name_addr, name, name_len);
if (status != 0)
+ goto err;
+
+ /* See if we've already loaded something with this name. */
+ while (so_list)
{
- error ("Error while reading dynamic library list.\n");
- return;
+ if (!strcmp (so_list->som_solib.name, name))
+ break;
+ so_list = so_list->next;
+ }
+
+ /* We've already loaded this one or it's the main program, skip it. */
+ if (so_list || !strcmp (name, symfile_objfile->name))
+ {
+ status = target_read_memory (addr + 36, buf, 4);
+ if (status != 0)
+ goto err;
+
+ addr = (CORE_ADDR) extract_unsigned_integer (buf, 4);
+ continue;
}
+
name = obsavestring (name, name_len - 1,
&symfile_objfile->symbol_obstack);
status = target_read_memory (addr + 8, buf, 4);
if (status != 0)
+ goto err;
+
+ text_addr = extract_unsigned_integer (buf, 4);
+
+
+ new_so = (struct so_list *) malloc (sizeof (struct so_list));
+ memset ((char *)new_so, 0, sizeof (struct so_list));
+ if (so_list_head == NULL)
{
- error ("Error while reading dynamic library list.\n");
- return;
+ so_list_head = new_so;
+ so_list_tail = new_so;
}
- text_addr = extract_unsigned_integer (buf, 4);
+ else
+ {
+ so_list_tail->next = new_so;
+ so_list_tail = new_so;
+ }
+
+ /* Fill in all the entries in GDB's shared library list. */
+ new_so->som_solib.name = name;
+ status = target_read_memory (addr + 4, buf, 4);
+ if (status != 0)
+ goto err;
- /* OK, we've got everything we need. Tell GDB about it. */
- symbol_file_add (name, from_tty, text_addr, 0, 0, 0);
+ new_so->som_solib.struct_version = extract_unsigned_integer (buf + 3, 1);
+ new_so->som_solib.bind_mode = extract_unsigned_integer (buf + 2, 1);
+ new_so->som_solib.library_version = extract_unsigned_integer (buf, 2);
+ new_so->som_solib.text_addr = text_addr;
+
+ status = target_read_memory (addr + 12, buf, 4);
+ if (status != 0)
+ goto err;
+
+ new_so->som_solib.text_link_addr = extract_unsigned_integer (buf, 4);
+
+ status = target_read_memory (addr + 16, buf, 4);
+ if (status != 0)
+ goto err;
+
+ new_so->som_solib.text_end = extract_unsigned_integer (buf, 4);
+
+ status = target_read_memory (addr + 20, buf, 4);
+ if (status != 0)
+ goto err;
+
+ new_so->som_solib.data_start = extract_unsigned_integer (buf, 4);
+
+ status = target_read_memory (addr + 24, buf, 4);
+ if (status != 0)
+ goto err;
+
+ new_so->som_solib.bss_start = extract_unsigned_integer (buf, 4);
+
+ status = target_read_memory (addr + 28, buf, 4);
+ if (status != 0)
+ goto err;
+
+ new_so->som_solib.data_end = extract_unsigned_integer (buf, 4);
+
+ status = target_read_memory (addr + 32, buf, 4);
+ if (status != 0)
+ goto err;
+
+ new_so->som_solib.got_value = extract_unsigned_integer (buf, 4);
- /* Get address of the next record. */
status = target_read_memory (addr + 36, buf, 4);
if (status != 0)
+ goto err;
+
+ new_so->som_solib.next = (void *)extract_unsigned_integer (buf, 4);
+ addr = (CORE_ADDR)new_so->som_solib.next;
+
+ new_so->objfile = symbol_file_add (name, from_tty, text_addr, 0, 0, 0);
+ new_so->abfd = new_so->objfile->obfd;
+
+ if (!bfd_check_format (new_so->abfd, bfd_object))
+ {
+ error ("\"%s\": not in executable format: %s.",
+ name, bfd_errmsg (bfd_get_error ()));
+ }
+
+ /* Now we need to build a section table for this library since
+ we might be debugging a core file from a dynamically linked
+ executable in which the libraries were not privately mapped. */
+ if (build_section_table (new_so->abfd,
+ &new_so->sections,
+ &new_so->sections_end))
{
- error ("Error while reading dynamic library list.\n");
+ error ("Unable to build section table for shared library\n.");
return;
}
- addr = extract_unsigned_integer (buf, 4);
+
+ /* Relocate all the sections based on where they got loaded. */
+ for (p = new_so->sections; p < new_so->sections_end; p++)
+ {
+ if (p->the_bfd_section->flags & SEC_CODE)
+ {
+ p->addr += text_addr - new_so->som_solib.text_link_addr;
+ p->endaddr += text_addr - new_so->som_solib.text_link_addr;
+ }
+ else if (p->the_bfd_section->flags & SEC_DATA)
+ {
+ p->addr += new_so->som_solib.data_start;
+ p->endaddr += new_so->som_solib.data_start;
+ }
+ }
+
+ /* Now see if we need to map in the text and data for this shared
+ library (for example debugging a core file which does not use
+ private shared libraries.).
+
+ Carefully peek at the first text address in the library. If the
+ read succeeds, then the libraries were privately mapped and were
+ included in the core dump file.
+
+ If the peek failed, then the libraries were not privately mapped
+ and are not in the core file, we'll have to read them in ourselves. */
+ status = target_read_memory (text_addr, buf, 4);
+ if (status != 0)
+ {
+ int old, new;
+
+ new = new_so->sections_end - new_so->sections;
+ /* Add sections from the shared library to the core target. */
+ if (target->to_sections)
+ {
+ old = target->to_sections_end - target->to_sections;
+ target->to_sections = (struct section_table *)
+ xrealloc ((char *)target->to_sections,
+ ((sizeof (struct section_table)) * (old + new)));
+ }
+ else
+ {
+ old = 0;
+ target->to_sections = (struct section_table *)
+ xmalloc ((sizeof (struct section_table)) * new);
+ }
+ target->to_sections_end = (target->to_sections + old + new);
+ memcpy ((char *)(target->to_sections + old),
+ new_so->sections,
+ ((sizeof (struct section_table)) * new));
+ }
}
/* Getting new symbols may change our opinion about what is
old_dld:
error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n");
return;
+
+err:
+ error ("Error while reading dynamic library list.\n");
+ return;
}
+
/* This hook gets called just before the first instruction in the
inferior process is executed.
Note that shared libraries are not mapped in at this time, so we have
run the inferior until the libraries are mapped in. Typically this
means running until the "_start" is called. */
-
-void
+
+void
som_solib_create_inferior_hook()
{
struct minimal_symbol *msymbol;
- asection *shlib_info;
unsigned int dld_flags, status;
+ asection *shlib_info;
char shadow_contents[BREAKPOINT_MAX], buf[4];
CORE_ADDR anaddr;
+ if (symfile_objfile == NULL)
+ return;
+
/* First see if the objfile was dynamically linked. */
shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
if (!shlib_info)
/* Get the address of __dld_flags, if no such symbol exists, then we can
not debug the shared code. */
- msymbol = lookup_minimal_symbol ("__dld_flags", (struct objfile *) NULL);
+ msymbol = lookup_minimal_symbol ("__dld_flags", NULL, NULL);
if (msymbol == NULL)
{
error ("Unable to find __dld_flags symbol in object file.\n");
}
/* Now find the address of _start and set a breakpoint there. */
- msymbol = lookup_minimal_symbol ("_start", symfile_objfile);
+ msymbol = lookup_minimal_symbol ("_start", NULL, symfile_objfile);
if (msymbol == NULL)
{
error ("Unable to find _start symbol in object file.\n");
return;
}
+ /* Wipe out all knowledge of old shared libraries since their
+ mapping can change from one exec to another! */
+ while (so_list_head)
+ {
+ struct so_list *temp;
+
+ free_objfile (so_list_head->objfile);
+ temp = so_list_head;
+ free (so_list_head);
+ so_list_head = temp->next;
+ }
+
/* Start the process again and wait for it to hit our breakpoint. */
clear_proceed_status ();
stop_soon_quietly = 1;
som_solib_add ((char *) 0, 0, (struct target_ops *) 0);
}
+
+/* Return the GOT value for the shared library in which ADDR belongs. If
+ ADDR isn't in any known shared library, return zero. */
+
+CORE_ADDR
+som_solib_get_got_by_pc (addr)
+ CORE_ADDR addr;
+{
+ struct so_list *so_list = so_list_head;
+ CORE_ADDR got_value = 0;
+
+ while (so_list)
+ {
+ if (so_list->som_solib.text_addr <= addr
+ && so_list->som_solib.text_end > addr)
+ {
+ got_value = so_list->som_solib.got_value;
+ break;
+ }
+ so_list = so_list->next;
+ }
+ return got_value;
+}
+
+int
+som_solib_section_offsets (objfile, offsets)
+ struct objfile *objfile;
+ struct section_offsets *offsets;
+{
+ struct so_list *so_list = so_list_head;
+
+ while (so_list)
+ {
+ /* Oh what a pain! We need the offsets before so_list->objfile
+ is valid. The BFDs will never match. Make a best guess. */
+ if (strstr (objfile->name, so_list->som_solib.name))
+ {
+ asection *private_section;
+
+ /* The text offset is easy. */
+ ANOFFSET (offsets, SECT_OFF_TEXT)
+ = (so_list->som_solib.text_addr
+ - so_list->som_solib.text_link_addr);
+ ANOFFSET (offsets, SECT_OFF_RODATA)
+ = ANOFFSET (offsets, SECT_OFF_TEXT);
+
+ /* We should look at presumed_dp in the SOM header, but
+ that's not easily available. This should be OK though. */
+ private_section = bfd_get_section_by_name (objfile->obfd,
+ "$PRIVATE$");
+ if (!private_section)
+ {
+ warning ("Unable to find $PRIVATE$ in shared library!");
+ ANOFFSET (offsets, SECT_OFF_DATA) = 0;
+ ANOFFSET (offsets, SECT_OFF_BSS) = 0;
+ return 1;
+ }
+ ANOFFSET (offsets, SECT_OFF_DATA)
+ = (so_list->som_solib.data_start - private_section->vma);
+ ANOFFSET (offsets, SECT_OFF_BSS)
+ = ANOFFSET (offsets, SECT_OFF_DATA);
+ return 1;
+ }
+ so_list = so_list->next;
+ }
+ return 0;
+}
+
+/* Dump information about all the currently loaded shared libraries. */
+
+static void
+som_sharedlibrary_info_command (ignore, from_tty)
+ char *ignore;
+ int from_tty;
+{
+ struct so_list *so_list = so_list_head;
+
+ if (exec_bfd == NULL)
+ {
+ printf_unfiltered ("no exec file.\n");
+ return;
+ }
+
+ if (so_list == NULL)
+ {
+ printf_unfiltered ("No shared libraries loaded at this time.\n");
+ return;
+ }
+
+ printf_unfiltered ("Shared Object Libraries\n");
+ printf_unfiltered (" %-12s%-12s%-12s%-12s%-12s%-12s\n",
+ " flags", " tstart", " tend", " dstart", " dend", " dlt");
+ while (so_list)
+ {
+ unsigned int flags;
+
+ flags = so_list->som_solib.struct_version << 24;
+ flags |= so_list->som_solib.bind_mode << 16;
+ flags |= so_list->som_solib.library_version;
+ printf_unfiltered ("%s\n", so_list->som_solib.name);
+ printf_unfiltered (" %-12s", local_hex_string_custom (flags, "08l"));
+ printf_unfiltered ("%-12s",
+ local_hex_string_custom (so_list->som_solib.text_addr, "08l"));
+ printf_unfiltered ("%-12s",
+ local_hex_string_custom (so_list->som_solib.text_end, "08l"));
+ printf_unfiltered ("%-12s",
+ local_hex_string_custom (so_list->som_solib.data_start, "08l"));
+ printf_unfiltered ("%-12s",
+ local_hex_string_custom (so_list->som_solib.data_end, "08l"));
+ printf_unfiltered ("%-12s\n",
+ local_hex_string_custom (so_list->som_solib.got_value, "08l"));
+ so_list = so_list->next;
+ }
+}
+
+static void
+som_solib_sharedlibrary_command (args, from_tty)
+ char *args;
+ int from_tty;
+{
+ dont_repeat ();
+ som_solib_add (args, from_tty, (struct target_ops *) 0);
+}
+
+void
+_initialize_som_solib ()
+{
+ add_com ("sharedlibrary", class_files, som_solib_sharedlibrary_command,
+ "Load shared object library symbols for files matching REGEXP.");
+ add_info ("sharedlibrary", som_sharedlibrary_info_command,
+ "Status of loaded shared object libraries.");
+}