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Pass two pointer parameters to the r_debug_state() hook

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function, thus allowing a debugger or other trace tool
to easily grab the addresses of the needed structures
off the stack.

This change is transparent to gdb, which locates the
link_map list and transfers it to debugger memory
for comparison purposes.

A sample program will be committed showing how this can
be used.

Reviewed by:    John Polstra <jdp@FreeBSD.org>
This commit is contained in:
John W. De Boskey 2000-08-26 05:13:29 +00:00
parent 3f3a4815f4
commit bde08d0072
1 changed files with 18 additions and 8 deletions
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26
libexec/rtld-elf/rtld.c
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@ -112,7 +112,7 @@ static void trace_loaded_objects(Obj_Entry *obj);
static void unload_object(Obj_Entry *);
static void unref_dag(Obj_Entry *);
void r_debug_state(void);
void r_debug_state(struct r_debug*, struct link_map*);
void xprintf(const char *, ...);
/*
@ -144,7 +144,7 @@ static LockInfo lockinfo;
static Elf_Sym sym_zero; /* For resolving undefined weak refs. */
#define GDB_STATE(s) r_debug.r_state = s; r_debug_state();
#define GDB_STATE(s,m) r_debug.r_state = s; r_debug_state(&r_debug,m);
extern Elf_Dyn _DYNAMIC;
#pragma weak _DYNAMIC
@ -392,7 +392,7 @@ _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
objlist_init(&initlist);
initlist_add_objects(obj_list, preload_tail, &initlist);
r_debug_state(); /* say hello to gdb! */
r_debug_state(NULL, &obj_main->linkmap); /* say hello to gdb! */
objlist_call_init(&initlist);
wlock_acquire();
@ -1498,9 +1498,9 @@ dlclose(void *handle)
objlist_remove_unref(&list_fini);
/* Finish cleaning up the newly-unreferenced objects. */
GDB_STATE(RT_DELETE);
GDB_STATE(RT_DELETE,&root->linkmap);
unload_object(root);
GDB_STATE(RT_CONSISTENT);
GDB_STATE(RT_CONSISTENT,NULL);
}
wlock_release();
return 0;
@ -1546,7 +1546,7 @@ dlopen(const char *name, int mode)
objlist_init(&initlist);
wlock_acquire();
GDB_STATE(RT_ADD);
GDB_STATE(RT_ADD,NULL);
old_obj_tail = obj_tail;
obj = NULL;
@ -1581,7 +1581,7 @@ dlopen(const char *name, int mode)
}
}
GDB_STATE(RT_CONSISTENT);
GDB_STATE(RT_CONSISTENT,obj ? &obj->linkmap : NULL);
/* Call the init functions with no locks held. */
wlock_release();
@ -1766,9 +1766,19 @@ linkmap_delete(Obj_Entry *obj)
/*
* Function for the debugger to set a breakpoint on to gain control.
*
* The two parameters allow the debugger to easily find and determine
* what the runtime loader is doing and to whom it is doing it.
*
* When the loadhook trap is hit (r_debug_state, set at program
* initialization), the arguments can be found on the stack:
*
* +8 struct link_map *m
* +4 struct r_debug *rd
* +0 RetAddr
*/
void
r_debug_state(void)
r_debug_state(struct r_debug* rd, struct link_map *m)
{
}