static int
kp_iter_mapping(const rd_loadobj_t *rlp, mdb_tgt_t *t)
{
kp_data_t *kp = t->t_data;
kp_file_t *kpf;
kp_map_t *kpm;
char name[MDB_TGT_MAPSZ];
if (mdb_tgt_readstr(t, MDB_TGT_AS_VIRT, name,
sizeof (name), (mdb_tgt_addr_t)rlp->rl_nameaddr) <= 0) {
mdb_dprintf(MDB_DBG_TGT, "failed to read name %p",
(void *)rlp->rl_nameaddr);
return (1); /* Keep going; forget this if we can't read name */
}
mdb_dprintf(MDB_DBG_TGT, "rd_loadobj name = \"%s\" rl_base = %p\n",
name, (void *)rlp->rl_base);
if ((kpm = kp_addr_to_kpmap(kp, rlp->rl_base)) == NULL)
return (1); /* Keep going; no mapping at this address */
(void) strncpy(kpm->kpm_map.map_name, name, MDB_TGT_MAPSZ);
kpm->kpm_map.map_name[MDB_TGT_MAPSZ - 1] = '\0';
if ((kpf = kpm->kpm_file) == NULL) {
if (kpm == kp->kp_map_exec)
kpf = kp_file_create(t, kpm, ET_EXEC);
else
kpf = kp_file_create(t, kpm, ET_DYN);
if (kpf == NULL)
return (1); /* Keep going; failed to build ELF file */
} else
kpf->kpf_basename = strbasename(kpm->kpm_map.map_name);
if ((kpm = kp_find_data(kp, kpf, rlp)) != NULL) {
mdb_dprintf(MDB_DBG_TGT, "found data for %s at %p\n",
kpf->kpf_basename, (void *)kpm->kpm_map.map_base);
kpm->kpm_file = kpf;
}
return (1);
}
ssize_t
mdb_readstr(char *buf, size_t nbytes, uintptr_t addr)
{
return (mdb_tgt_readstr(mdb.m_target, MDB_TGT_AS_VIRT,
buf, nbytes, addr));
}
static void
kt_load_modules(kt_data_t *kt, mdb_tgt_t *t)
{
char name[MAXNAMELEN];
uintptr_t addr, head;
struct module kmod;
struct modctl ctl;
Shdr symhdr, strhdr;
GElf_Sym sym;
kt_module_t *km;
if (mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC,
"modules", &sym, NULL) == -1) {
warn("failed to get 'modules' symbol");
return;
}
if (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &ctl, sizeof (ctl),
MDB_TGT_OBJ_EXEC, "modules") != sizeof (ctl)) {
warn("failed to read 'modules' struct");
return;
}
addr = head = (uintptr_t)sym.st_value;
do {
if (addr == NULL)
break; /* Avoid spurious NULL pointers in list */
if (mdb_tgt_vread(t, &ctl, sizeof (ctl), addr) == -1) {
warn("failed to read modctl at %p", (void *)addr);
return;
}
if (ctl.mod_mp == NULL)
continue; /* No associated krtld structure */
if (mdb_tgt_readstr(t, MDB_TGT_AS_VIRT, name, MAXNAMELEN,
(uintptr_t)ctl.mod_modname) <= 0) {
warn("failed to read module name at %p",
(void *)ctl.mod_modname);
continue;
}
mdb_dprintf(MDB_DBG_KMOD, "reading mod %s (%p)\n",
name, (void *)addr);
if (mdb_nv_lookup(&kt->k_modules, name) != NULL) {
warn("skipping duplicate module '%s', id=%d\n",
name, ctl.mod_id);
continue;
}
if (mdb_tgt_vread(t, &kmod, sizeof (kmod),
(uintptr_t)ctl.mod_mp) == -1) {
warn("failed to read module at %p\n",
(void *)ctl.mod_mp);
continue;
}
if (kmod.symspace == NULL || kmod.symhdr == NULL ||
kmod.strhdr == NULL) {
/*
* If no buffer for the symbols has been allocated,
* or the shdrs for .symtab and .strtab are missing,
* then we're out of luck.
*/
continue;
}
if (mdb_tgt_vread(t, &symhdr, sizeof (Shdr),
(uintptr_t)kmod.symhdr) == -1) {
warn("failed to read .symtab header for '%s', id=%d",
name, ctl.mod_id);
continue;
}
if (mdb_tgt_vread(t, &strhdr, sizeof (Shdr),
(uintptr_t)kmod.strhdr) == -1) {
warn("failed to read .strtab header for '%s', id=%d",
name, ctl.mod_id);
continue;
}
/*
* Now get clever: f(*^ing krtld didn't used to bother updating
* its own kmod.symsize value. We know that prior to this bug
* being fixed, symspace was a contiguous buffer containing
* .symtab, .strtab, and the symbol hash table in that order.
* So if symsize is zero, recompute it as the size of .symtab
* plus the size of .strtab. We don't need to load the hash
* table anyway since we re-hash all the symbols internally.
*/
if (kmod.symsize == 0)
kmod.symsize = symhdr.sh_size + strhdr.sh_size;
/*
* Similar logic can be used to make educated guesses
* at the values of kmod.symtbl and kmod.strings.
*/
if (kmod.symtbl == NULL)
kmod.symtbl = kmod.symspace;
if (kmod.strings == NULL)
kmod.strings = kmod.symspace + symhdr.sh_size;
/*
* Make sure things seem reasonable before we proceed
* to actually read and decipher the symspace.
*/
if (KT_BAD_BUF(kmod.symtbl, kmod.symspace, kmod.symsize) ||
KT_BAD_BUF(kmod.strings, kmod.symspace, kmod.symsize)) {
warn("skipping module '%s', id=%d (corrupt symspace)\n",
name, ctl.mod_id);
continue;
}
km = mdb_zalloc(sizeof (kt_module_t), UM_SLEEP);
km->km_name = strdup(name);
(void) mdb_nv_insert(&kt->k_modules, km->km_name, NULL,
(uintptr_t)km, MDB_NV_EXTNAME);
km->km_datasz = kmod.symsize;
km->km_symspace_va = (uintptr_t)kmod.symspace;
km->km_symtab_va = (uintptr_t)kmod.symtbl;
km->km_strtab_va = (uintptr_t)kmod.strings;
km->km_symtab_hdr = symhdr;
km->km_strtab_hdr = strhdr;
km->km_text_va = (uintptr_t)kmod.text;
km->km_text_size = kmod.text_size;
km->km_data_va = (uintptr_t)kmod.data;
km->km_data_size = kmod.data_size;
km->km_bss_va = (uintptr_t)kmod.bss;
km->km_bss_size = kmod.bss_size;
if (kt->k_ctfvalid) {
km->km_ctf_va = (uintptr_t)kmod.ctfdata;
km->km_ctf_size = kmod.ctfsize;
}
/*
* Add the module to the end of the list of modules in load-
* dependency order. This is needed to load the corresponding
* debugger modules in the same order for layering purposes.
*/
mdb_list_append(&kt->k_modlist, km);
if (t->t_flags & MDB_TGT_F_PRELOAD) {
mdb_iob_printf(mdb.m_out, " %s", name);
mdb_iob_flush(mdb.m_out);
kt_load_module(kt, t, km);
}
} while ((addr = (uintptr_t)ctl.mod_next) != head);
}
