darkkirb/old-cross-binutils
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

* solib-svr4.c (debug_loader_offset_p, debug_loader_offset)

Browse source 
(debug_loader_name, svr4_default_sos): New.
	(svr4_current_sos): Call svr4_default_sos.
	(enable_break): Add a comment about AT_BASE.  Set the new
	variables and retry solib_add.
	(svr4_clear_solib): Clear the new variables.
This commit is contained in:
Daniel Jacobowitz 2006-10-18 15:34:39 +00:00
parent 7d3d3ece84
commit 3443977099
2 changed files with 73 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
gdb/ChangeLog
View file

@ -1,4 +1,13 @@
2006-10-17 Daniel Jacobowitz <dan@codesourcery.com>
2006-10-18 Daniel Jacobowitz <dan@codesourcery.com>
* solib-svr4.c (debug_loader_offset_p, debug_loader_offset)
(debug_loader_name, svr4_default_sos): New.
(svr4_current_sos): Call svr4_default_sos.
(enable_break): Add a comment about AT_BASE. Set the new
variables and retry solib_add.
(svr4_clear_solib): Clear the new variables.
2006-10-18 Daniel Jacobowitz <dan@codesourcery.com>
* NEWS: Mention support for TLS without debugging information.

61
gdb/solib-svr4.c
View file

@ -267,6 +267,15 @@ IGNORE_FIRST_LINK_MAP_ENTRY (struct so_list *so)
static CORE_ADDR debug_base; /* Base of dynamic linker structures */
static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
/* Validity flag for debug_loader_offset. */
static int debug_loader_offset_p;
/* Load address for the dynamic linker, inferred. */
static CORE_ADDR debug_loader_offset;
/* Name of the dynamic linker, valid if debug_loader_offset_p. */
static char *debug_loader_name;
/* Local function prototypes */
static int match_main (char *);
@ -657,6 +666,37 @@ open_symbol_file_object (void *from_ttyp)
return 1;
}
/* If no shared library information is available from the dynamic
linker, build a fallback list from other sources. */
static struct so_list *
svr4_default_sos (void)
{
struct so_list *head = NULL;
struct so_list **link_ptr = &head;
if (debug_loader_offset_p)
{
struct so_list *new = XZALLOC (struct so_list);
new->lm_info = xmalloc (sizeof (struct lm_info));
/* Nothing will ever check the cached copy of the link
map if we set l_addr. */
new->lm_info->l_addr = debug_loader_offset;
new->lm_info->lm = NULL;
strncpy (new->so_name, debug_loader_name, SO_NAME_MAX_PATH_SIZE - 1);
new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
strcpy (new->so_original_name, new->so_name);
*link_ptr = new;
link_ptr = &new->next;
}
return head;
}
/* LOCAL FUNCTION
current_sos -- build a list of currently loaded shared objects
@ -693,12 +733,13 @@ svr4_current_sos (void)
/* 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;
return svr4_default_sos ();
}
/* Walk the inferior's link map list, and build our list of
`struct so_list' nodes. */
lm = solib_svr4_r_map ();
while (lm)
{
struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
@ -765,6 +806,9 @@ svr4_current_sos (void)
discard_cleanups (old_chain);
}
if (head == NULL)
return svr4_default_sos ();
return head;
}
@ -983,6 +1027,11 @@ enable_break (void)
be trivial on GNU/Linux). Therefore, we have to try an alternate
mechanism to find the dynamic linker's base address. */
/* TODO drow/2006-09-12: This is somewhat fragile, because it
relies on read_pc. On both Solaris and GNU/Linux we can use
the AT_BASE auxilliary entry, which GDB now knows how to
access, to find the base address. */
tmp_fd = solib_open (buf, &tmp_pathname);
if (tmp_fd >= 0)
tmp_bfd = bfd_fopen (tmp_pathname, gnutarget, FOPEN_RB, tmp_fd);
@ -1022,8 +1071,14 @@ enable_break (void)
the current pc (which should point at the entry point for the
dynamic linker) and subtracting the offset of the entry point. */
if (!load_addr_found)
{
load_addr = (read_pc ()
- exec_entry_point (tmp_bfd, tmp_bfd_target));
debug_loader_name = xstrdup (buf);
debug_loader_offset_p = 1;
debug_loader_offset = load_addr;
solib_add (NULL, 0, NULL, auto_solib_add);
}
/* Record the relocated start and end address of the dynamic linker
text and plt section for svr4_in_dynsym_resolve_code. */
@ -1335,6 +1390,10 @@ static void
svr4_clear_solib (void)
{
debug_base = 0;
debug_loader_offset_p = 0;
debug_loader_offset = 0;
xfree (debug_loader_name);
debug_loader_name = NULL;
}
static void