krtld.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/machelf.h>
#include <sys/modctl.h>
#include <sys/kobj.h>
#include <mdb/mdb_modapi.h>
static uintptr_t module_head; /* Head of kernel modctl list */
struct modctl_walk_data {
uintptr_t mwd_head;
struct modctl mwd_modctl;
};
static int
modctl_walk_init(mdb_walk_state_t *wsp)
{
struct modctl_walk_data *mwd = mdb_alloc(
sizeof (struct modctl_walk_data), UM_SLEEP);
mwd->mwd_head = (wsp->walk_addr == NULL ? module_head : wsp->walk_addr);
wsp->walk_data = mwd;
wsp->walk_addr = NULL;
return (WALK_NEXT);
}
static int
modctl_walk_step(mdb_walk_state_t *wsp)
{
struct modctl_walk_data *mwd = wsp->walk_data;
int status;
if (wsp->walk_addr == mwd->mwd_head)
return (WALK_DONE);
if (wsp->walk_addr == NULL)
wsp->walk_addr = mwd->mwd_head;
if (mdb_vread(&mwd->mwd_modctl, sizeof (struct modctl),
wsp->walk_addr) == -1) {
mdb_warn("failed to read modctl at %p", wsp->walk_addr);
return (WALK_ERR);
}
status = wsp->walk_callback(wsp->walk_addr, &mwd->mwd_modctl,
wsp->walk_cbdata);
wsp->walk_addr = (uintptr_t)mwd->mwd_modctl.mod_next;
return (status);
}
static void
modctl_walk_fini(mdb_walk_state_t *wsp)
{
mdb_free(wsp->walk_data, sizeof (struct modctl_walk_data));
}
/*ARGSUSED*/
static int
modctl_format(uintptr_t addr, const void *data, void *private)
{
const struct modctl *mcp = (const struct modctl *)data;
char name[MAXPATHLEN], bits[6], *bp = &bits[0];
if (mdb_readstr(name, sizeof (name),
(uintptr_t)mcp->mod_filename) == -1)
(void) strcpy(name, "???");
if (mcp->mod_busy)
*bp++ = 'b';
if (mcp->mod_want)
*bp++ = 'w';
if (mcp->mod_prim)
*bp++ = 'p';
if (mcp->mod_loaded)
*bp++ = 'l';
if (mcp->mod_installed)
*bp++ = 'i';
*bp = '\0';
mdb_printf("%?p %?p %6s 0x%02x %3d %s\n",
(uintptr_t)addr, (uintptr_t)mcp->mod_mp, bits, mcp->mod_loadflags,
mcp->mod_ref, name);
return (WALK_NEXT);
}
/*ARGSUSED*/
static int
modctls(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
if (argc != 0)
return (DCMD_USAGE);
if ((flags & DCMD_LOOPFIRST) || !(flags & DCMD_LOOP)) {
mdb_printf("%<u>%?s %?s %6s %4s %3s %s%</u>\n",
"MODCTL", "MODULE", "BITS", "FLAGS", "REF", "FILE");
}
if (flags & DCMD_ADDRSPEC) {
struct modctl mc;
(void) mdb_vread(&mc, sizeof (mc), addr);
return (modctl_format(addr, &mc, NULL));
}
if (mdb_walk("modctl", modctl_format, NULL) == -1)
return (DCMD_ERR);
return (DCMD_OK);
}
static void
dump_ehdr(const Ehdr *ehdr)
{
mdb_printf("\nELF Header\n");
mdb_printf(" ei_magic: { 0x%02x, %c, %c, %c }\n",
ehdr->e_ident[EI_MAG0], ehdr->e_ident[EI_MAG1],
ehdr->e_ident[EI_MAG2], ehdr->e_ident[EI_MAG3]);
mdb_printf(" ei_class: %-18u ei_data: %-16u\n",
ehdr->e_ident[EI_CLASS], ehdr->e_ident[EI_DATA]);
mdb_printf(" e_machine: %-18hu e_version: %-16u\n",
ehdr->e_machine, ehdr->e_version);
mdb_printf(" e_type: %-18hu\n", ehdr->e_type);
mdb_printf(" e_flags: %-18u\n", ehdr->e_flags);
mdb_printf(" e_entry: 0x%16lx e_ehsize: %8hu e_shstrndx: %hu\n",
ehdr->e_entry, ehdr->e_ehsize, ehdr->e_shstrndx);
mdb_printf(" e_shoff: 0x%16lx e_shentsize: %8hu e_shnum: %hu\n",
ehdr->e_shoff, ehdr->e_shentsize, ehdr->e_shnum);
mdb_printf(" e_phoff: 0x%16lx e_phentsize: %8hu e_phnum: %hu\n",
ehdr->e_phoff, ehdr->e_phentsize, ehdr->e_phnum);
}
static void
dump_shdr(const Shdr *shdr, int i)
{
static const mdb_bitmask_t sh_type_masks[] = {
{ "SHT_NULL", 0xffffffff, SHT_NULL },
{ "SHT_PROGBITS", 0xffffffff, SHT_PROGBITS },
{ "SHT_SYMTAB", 0xffffffff, SHT_SYMTAB },
{ "SHT_STRTAB", 0xffffffff, SHT_STRTAB },
{ "SHT_RELA", 0xffffffff, SHT_RELA },
{ "SHT_HASH", 0xffffffff, SHT_HASH },
{ "SHT_DYNAMIC", 0xffffffff, SHT_DYNAMIC },
{ "SHT_NOTE", 0xffffffff, SHT_NOTE },
{ "SHT_NOBITS", 0xffffffff, SHT_NOBITS },
{ "SHT_REL", 0xffffffff, SHT_REL },
{ "SHT_SHLIB", 0xffffffff, SHT_SHLIB },
{ "SHT_DYNSYM", 0xffffffff, SHT_DYNSYM },
{ "SHT_LOSUNW", 0xffffffff, SHT_LOSUNW },
{ "SHT_SUNW_COMDAT", 0xffffffff, SHT_SUNW_COMDAT },
{ "SHT_SUNW_syminfo", 0xffffffff, SHT_SUNW_syminfo },
{ "SHT_SUNW_verdef", 0xffffffff, SHT_SUNW_verdef },
{ "SHT_SUNW_verneed", 0xffffffff, SHT_SUNW_verneed },
{ "SHT_SUNW_versym", 0xffffffff, SHT_SUNW_versym },
{ "SHT_HISUNW", 0xffffffff, SHT_HISUNW },
{ "SHT_LOPROC", 0xffffffff, SHT_LOPROC },
{ "SHT_HIPROC", 0xffffffff, SHT_HIPROC },
{ "SHT_LOUSER", 0xffffffff, SHT_LOUSER },
{ "SHT_HIUSER", 0xffffffff, SHT_HIUSER },
{ NULL, 0, 0 }
};
static const mdb_bitmask_t sh_flag_masks[] = {
{ "SHF_WRITE", SHF_WRITE, SHF_WRITE },
{ "SHF_ALLOC", SHF_ALLOC, SHF_ALLOC },
{ "SHF_EXECINSTR", SHF_EXECINSTR, SHF_EXECINSTR },
{ "SHF_MASKPROC", SHF_MASKPROC, SHF_MASKPROC },
{ NULL, 0, 0 }
};
mdb_printf("\nSection Header[%d]:\n", i);
mdb_printf(" sh_addr: 0x%-16lx sh_flags: [ %#lb ]\n",
shdr->sh_addr, shdr->sh_flags, sh_flag_masks);
mdb_printf(" sh_size: 0x%-16lx sh_type: [ %#lb ]\n",
shdr->sh_size, shdr->sh_type, sh_type_masks);
mdb_printf(" sh_offset: 0x%-16lx sh_entsize: 0x%lx\n",
shdr->sh_offset, shdr->sh_entsize);
mdb_printf(" sh_link: 0x%-16lx sh_info: 0x%lx\n",
shdr->sh_link, shdr->sh_info);
mdb_printf(" sh_addralign: 0x%-16lx\n", shdr->sh_addralign);
}
/*ARGSUSED*/
static int
modhdrs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
struct modctl ctl;
struct module mod;
Shdr *shdrs;
size_t nbytes;
int i;
if (!(flags & DCMD_ADDRSPEC)) {
mdb_warn("expected address of struct modctl before ::\n");
return (DCMD_USAGE);
}
if (argc != 0)
return (DCMD_USAGE);
mdb_vread(&ctl, sizeof (struct modctl), addr);
mdb_vread(&mod, sizeof (struct module), (uintptr_t)ctl.mod_mp);
dump_ehdr(&mod.hdr);
nbytes = sizeof (Shdr) * mod.hdr.e_shnum;
shdrs = mdb_alloc(nbytes, UM_SLEEP | UM_GC);
mdb_vread(shdrs, nbytes, (uintptr_t)mod.shdrs);
for (i = 0; i < mod.hdr.e_shnum; i++)
dump_shdr(&shdrs[i], i);
return (DCMD_OK);
}
/*ARGSUSED*/
static int
modinfo_format(uintptr_t addr, const void *data, void *private)
{
const struct modctl *mcp = (const struct modctl *)data;
struct modlinkage linkage;
struct modlmisc lmisc;
struct module mod;
char info[MODMAXLINKINFOLEN];
char name[MODMAXNAMELEN];
mod.text_size = 0;
mod.data_size = 0;
mod.text = NULL;
linkage.ml_rev = 0;
info[0] = '\0';
if (mcp->mod_mp != NULL)
(void) mdb_vread(&mod, sizeof (mod), (uintptr_t)mcp->mod_mp);
if (mcp->mod_linkage != NULL) {
(void) mdb_vread(&linkage, sizeof (linkage),
(uintptr_t)mcp->mod_linkage);
if (linkage.ml_linkage[0] != NULL) {
(void) mdb_vread(&lmisc, sizeof (lmisc),
(uintptr_t)linkage.ml_linkage[0]);
mdb_readstr(info, sizeof (info),
(uintptr_t)lmisc.misc_linkinfo);
}
}
if (mdb_readstr(name, sizeof (name), (uintptr_t)mcp->mod_modname) == -1)
(void) strcpy(name, "???");
mdb_printf("%3d %?p %8lx %3d %s (%s)\n",
mcp->mod_id, mod.text, mod.text_size + mod.data_size,
linkage.ml_rev, name, info[0] != '\0' ? info : "?");
return (WALK_NEXT);
}
/*ARGSUSED*/
static int
modinfo(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
if (argc != 0)
return (DCMD_USAGE);
if ((flags & DCMD_LOOPFIRST) || !(flags & DCMD_LOOP)) {
mdb_printf("%<u>%3s %?s %8s %3s %s%</u>\n",
"ID", "LOADADDR", "SIZE", "REV", "MODULE NAME");
}
if (flags & DCMD_ADDRSPEC) {
struct modctl mc;
(void) mdb_vread(&mc, sizeof (mc), addr);
return (modinfo_format(addr, &mc, NULL));
}
if (mdb_walk("modctl", modinfo_format, NULL) == -1)
return (DCMD_ERR);
return (DCMD_OK);
}
/*ARGSUSED*/
static int
ctfinfo_format(uintptr_t addr, const struct modctl *mcp, void *private)
{
char name[MODMAXNAMELEN];
struct module mod;
if (mcp->mod_mp == NULL)
return (WALK_NEXT); /* module is not loaded */
if (mdb_vread(&mod, sizeof (mod), (uintptr_t)mcp->mod_mp) == -1) {
mdb_warn("failed to read module at %p for modctl %p\n",
mcp->mod_mp, addr);
return (WALK_NEXT);
}
if (mdb_readstr(name, sizeof (name), (uintptr_t)mcp->mod_modname) == -1)
(void) mdb_snprintf(name, sizeof (name), "%a", mcp->mod_mp);
mdb_printf("%-30s %?p %lu\n", name, mod.ctfdata, (ulong_t)mod.ctfsize);
return (WALK_NEXT);
}
/*ARGSUSED*/
static int
ctfinfo(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
if ((flags & DCMD_ADDRSPEC) || argc != 0)
return (DCMD_USAGE);
mdb_printf("%<u>%-30s %?s %s%</u>\n", "MODULE", "CTFDATA", "CTFSIZE");
if (mdb_walk("modctl", (mdb_walk_cb_t)ctfinfo_format, NULL) == -1)
return (DCMD_ERR);
return (DCMD_OK);
}
static const mdb_dcmd_t dcmds[] = {
{ "modctl", NULL, "list modctl structures", modctls },
{ "modhdrs", ":", "given modctl, dump module ehdr and shdrs", modhdrs },
{ "modinfo", NULL, "list module information", modinfo },
{ "ctfinfo", NULL, "list module CTF information", ctfinfo },
{ NULL }
};
static const mdb_walker_t walkers[] = {
{ "modctl", "list of modctl structures",
modctl_walk_init, modctl_walk_step, modctl_walk_fini },
{ NULL }
};
static const mdb_modinfo_t krtld_modinfo = { MDB_API_VERSION, dcmds, walkers };
const mdb_modinfo_t *
_mdb_init(void)
{
GElf_Sym sym;
if (mdb_lookup_by_name("modules", &sym) == -1) {
mdb_warn("failed to lookup 'modules'");
return (NULL);
}
module_head = (uintptr_t)sym.st_value;
return (&krtld_modinfo);
}