int
linkmap_init(Process *proc, struct ltelf *lte) {
void *dbg_addr = NULL, *dyn_addr = GELF_ADDR_CAST(lte->dyn_addr);
struct r_debug *rdbg = NULL;
struct cb_data data;
debug(DEBUG_FUNCTION, "linkmap_init()");
if (find_dynamic_entry_addr(proc, dyn_addr, DT_DEBUG, &dbg_addr) == -1) {
debug(2, "Couldn't find debug structure!");
return -1;
}
proc->debug = dbg_addr;
if (!(rdbg = load_debug_struct(proc))) {
debug(2, "No debug structure or no memory to allocate one!");
return -1;
}
data.lte = lte;
add_library_symbol(rdbg->r_brk, "", &library_symbols, LS_TOPLT_NONE, 0);
insert_breakpoint(proc, sym2addr(proc, library_symbols),
library_symbols, 1);
crawl_linkmap(proc, rdbg, hook_libdl_cb, &data);
free(rdbg);
return 0;
}
int
linkmap_init(struct Process *proc, arch_addr_t dyn_addr)
{
debug(DEBUG_FUNCTION, "linkmap_init(%d, dyn_addr=%p)", proc->pid, dyn_addr);
if (arch_find_dl_debug(proc, dyn_addr, &proc->os.debug_addr) == -1) {
debug(2, "Couldn't find debug structure!");
return -1;
}
int status;
struct lt_r_debug_64 rdbg;
if ((status = load_debug_struct(proc, &rdbg)) < 0) {
debug(2, "No debug structure or no memory to allocate one!");
return status;
}
/* XXX The double cast should be removed when
* arch_addr_t becomes integral type. */
arch_addr_t addr = (arch_addr_t)(uintptr_t)rdbg.r_brk;
if (arch_translate_address_dyn(proc, addr, &addr) < 0)
return -1;
struct breakpoint *rdebug_bp = insert_breakpoint(proc, addr, NULL);
static struct bp_callbacks rdebug_callbacks = {
.on_hit = rdebug_bp_on_hit,
};
rdebug_bp->cbs = &rdebug_callbacks;
crawl_linkmap(proc, &rdbg);
return 0;
}
void
arch_check_dbg(Process *proc) {
struct r_debug *dbg = NULL;
struct cb_data data;
debug(DEBUG_FUNCTION, "arch_check_dbg");
if (!(dbg = load_debug_struct(proc))) {
debug(2, "Unable to load debug structure!");
return;
}
if (dbg->r_state == RT_CONSISTENT) {
debug(2, "Linkmap is now consistent");
if (proc->debug_state == RT_ADD) {
debug(2, "Adding DSO to linkmap");
data.proc = proc;
crawl_linkmap(proc, dbg, linkmap_add_cb, &data);
} else if (proc->debug_state == RT_DELETE) {
debug(2, "Removing DSO from linkmap");
} else {
debug(2, "Unexpected debug state!");
}
}
proc->debug_state = dbg->r_state;
return;
}
static void
rdebug_bp_on_hit(struct breakpoint *bp, struct Process *proc)
{
debug(DEBUG_FUNCTION, "arch_check_dbg");
struct lt_r_debug_64 rdbg;
if (load_debug_struct(proc, &rdbg) < 0) {
debug(2, "Unable to load debug structure!");
return;
}
if (rdbg.r_state == RT_CONSISTENT) {
debug(2, "Linkmap is now consistent");
switch (proc->os.debug_state) {
case RT_ADD:
debug(2, "Adding DSO to linkmap");
crawl_linkmap(proc, &rdbg);
break;
case RT_DELETE:
debug(2, "Removing DSO from linkmap");
// XXX unload that library
break;
default:
debug(2, "Unexpected debug state!");
}
}
proc->os.debug_state = rdbg.r_state;
}