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Fix the loader to handle module dependencies properly. More fixes

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will be provided after modmetadata appears in the kernel.

Reviewed by:	msmith
Approved by:	jkh
This commit is contained in:
Boris Popov 2000-02-25 05:10:44 +00:00
parent 38ba484ce1
commit ce0d1c79c3
2 changed files with 80 additions and 107 deletions
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47
sys/boot/common/load_elf.c
View File

@ -212,10 +212,7 @@ elf_loadimage(struct loaded_module *mp, int fd, vm_offset_t off,
vm_offset_t ssym, esym;
Elf_Dyn *dp;
int ndp;
int deplen;
char *depdata;
char *s;
int len;
char *strtab;
size_t strsz;
int symstrindex;
@ -450,7 +447,6 @@ elf_loadimage(struct loaded_module *mp, int fd, vm_offset_t off,
goto out;
strtab = NULL;
strsz = 0;
deplen = 0;
for (i = 0; i < ndp; i++) {
if (dp[i].d_tag == NULL)
break;
@ -468,44 +464,17 @@ elf_loadimage(struct loaded_module *mp, int fd, vm_offset_t off,
if (strtab == NULL || strsz == 0)
goto out;
deplen = 0;
for (i = 0; i < ndp; i++) {
if (dp[i].d_tag == NULL)
break;
switch (dp[i].d_tag) {
case DT_NEEDED: /* count size for dependency list */
j = dp[i].d_un.d_ptr;
if (j < 1 || j > (strsz - 2))
continue; /* bad symbol name index */
deplen += strlenout((vm_offset_t)&strtab[j]) + 1;
break;
default:
break;
}
}
if (deplen > 0) {
depdata = malloc(deplen);
if (depdata == NULL)
goto out;
s = depdata;
for (i = 0; i < ndp; i++) {
if (dp[i].d_tag == NULL)
break;
switch (dp[i].d_tag) {
case DT_NEEDED: /* dependency list */
j = dp[i].d_un.d_ptr;
len = strlenout((vm_offset_t)&strtab[j]) + 1;
archsw.arch_copyout((vm_offset_t)&strtab[j], s, len);
s += len;
break;
default:
break;
}
}
if ((s - depdata) > 0)
mod_addmetadata(mp, MODINFOMD_DEPLIST, s - depdata, depdata);
free(depdata);
if (dp[i].d_tag != DT_NEEDED)
continue;
j = dp[i].d_un.d_ptr;
if (j < 1 || j > (strsz - 2))
continue; /* bad symbol name index */
s = strdupout((vm_offset_t)&strtab[j]);
mod_addmetadata(mp, MODINFOMD_DEPLIST, strlen(s) + 1, s);
free(s);
}
out:

140
sys/boot/common/module.c
View File

@ -37,11 +37,12 @@
#include "bootstrap.h"
static struct loaded_module *mod_loadmodule(char *name, int argc, char *argv[]);
static char *mod_searchdep(struct loaded_module *mp);
static int mod_loadmodule(char *name, int argc, char *argv[], struct loaded_module **mpp);
static int file_load_dependancies(struct loaded_module *base_file);
static char *mod_searchfile(char *name);
static char *mod_searchmodule(char *name);
static void mod_append(struct loaded_module *mp);
static struct module_metadata *metadata_next(struct module_metadata *md, int type);
/* load address should be tweaked by first module loaded (kernel) */
static vm_offset_t loadaddr = 0;
@ -68,7 +69,7 @@ static int
command_load(int argc, char *argv[])
{
char *typestr;
int dofile, ch;
int dofile, ch, error;
dofile = 0;
optind = 1;
@ -107,7 +108,10 @@ command_load(int argc, char *argv[])
/*
* Looks like a request for a module.
*/
return(mod_load(argv[1], argc - 2, argv + 2));
error = mod_load(argv[1], argc - 2, argv + 2);
if (error == EEXIST)
sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]);
return (error == 0 ? CMD_OK : CMD_ERROR);
}
COMMAND_SET(unload, "unload", "unload all modules", command_unload);
@ -185,7 +189,7 @@ int
mod_load(char *name, int argc, char *argv[])
{
struct loaded_module *last_mod, *base_mod, *mp;
char *dep_name;
int error;
/* remember previous last module on chain */
for (last_mod = loaded_modules;
@ -197,28 +201,23 @@ mod_load(char *name, int argc, char *argv[])
* Load the first module; note that it's the only one that gets
* arguments explicitly.
*/
if ((base_mod = mod_loadmodule(name, argc, argv)) == NULL)
return(CMD_ERROR);
error = mod_loadmodule(name, argc, argv, &base_mod);
if (error)
return (error);
/*
* Look for dependancies.
*/
while ((dep_name = mod_searchdep(base_mod)) != NULL) {
printf("loading required module '%s'\n", dep_name);
if ((mp = mod_loadmodule(dep_name, 0, NULL)) == NULL) {
/* Load failed; discard everything */
while (base_mod != NULL) {
mp = base_mod;
base_mod = base_mod->m_next;
mod_discard(mp);
}
last_mod->m_next = NULL;
loadaddr = last_mod->m_addr + last_mod->m_size;
/* error message already set by mod_loadmodule */
return(CMD_ERROR);
}
error = file_load_dependancies(base_mod);
if (!error)
return (0);
/* Load failed; discard everything */
last_mod->m_next = NULL;
loadaddr = last_mod->m_addr + last_mod->m_size;
while (base_mod != NULL) {
mp = base_mod;
base_mod = base_mod->m_next;
mod_discard(mp);
}
return(CMD_OK);
return (error);
}
/*
@ -291,8 +290,8 @@ mod_loadobj(char *type, char *name)
* Load the module (name), pass it (argc),(argv).
* Don't do any dependancy checking.
*/
static struct loaded_module *
mod_loadmodule(char *name, int argc, char *argv[])
static int
mod_loadmodule(char *name, int argc, char *argv[], struct loaded_module **mpp)
{
struct loaded_module *mp;
int i, err;
@ -302,10 +301,22 @@ mod_loadmodule(char *name, int argc, char *argv[])
cp = mod_searchmodule(name);
if (cp == NULL) {
sprintf(command_errbuf, "can't find '%s'", name);
return(NULL);
return (ENOENT);
}
name = cp;
cp = strrchr(name, '/');
if (cp)
cp++;
else
cp = name;
/* see if module is already loaded */
mp = mod_findmodule(cp, NULL);
if (mp) {
*mpp = mp;
return (EEXIST);
}
err = 0;
for (i = 0, mp = NULL; (module_formats[i] != NULL) && (mp == NULL); i++) {
if ((err = (module_formats[i]->l_load)(name, loadaddr, &mp)) != 0) {
@ -317,7 +328,7 @@ mod_loadmodule(char *name, int argc, char *argv[])
/* Fatal error */
sprintf(command_errbuf, "can't load module '%s': %s", name, strerror(err));
free(name);
return(NULL);
return (err);
} else {
/* Load was OK, set args */
@ -331,6 +342,7 @@ mod_loadmodule(char *name, int argc, char *argv[])
/* Add to the list of loaded modules */
mod_append(mp);
*mpp = mp;
break;
}
@ -338,50 +350,31 @@ mod_loadmodule(char *name, int argc, char *argv[])
if (err == EFTYPE)
sprintf(command_errbuf, "don't know how to load module '%s'", name);
free(name);
return(mp);
return (err);
}
/*
* Search the modules from (mp) onwards, and return the name of the
* first unresolved dependancy, or NULL if none were found.
*/
static char *
mod_searchdep(struct loaded_module *mp)
static int
file_load_dependancies(struct loaded_module *base_file)
{
char *deps;
size_t deplen;
struct module_metadata *md;
struct loaded_module *dmp;
int dindex;
struct module_metadata *md;
char *dmodname;
int error;
for (; mp != NULL; mp = mp->m_next) {
/*
* Get KLD module data
*/
deps = NULL;
deplen = 0;
if ((md = mod_findmetadata(mp, MODINFOMD_DEPLIST)) != NULL) {
deps = (char *)md->md_data;
deplen = md->md_size;
md = mod_findmetadata(base_file, MODINFOMD_DEPLIST);
if (md == NULL)
return (0);
error = 0;
do {
dmodname = (char *)md->md_data;
if (mod_findmodule(NULL, dmodname) == NULL) {
printf("loading required module '%s'\n", dmodname);
error = mod_load(dmodname, 0, NULL);
if (error && error != EEXIST)
break;
}
if (deps != NULL && deplen > 0) {
/* Iterate over dependancies */
dindex = 0;
while (dindex < deplen) {
/*
* Look for a module matching the dependancy; if we don't have it,
* we need it.
*/
if ((dmp = mod_findmodule(&deps[dindex], NULL)) == NULL)
return(&deps[dindex]);
dindex += strlen(&deps[dindex]) + 1;
}
}
}
return(NULL);
md = metadata_next(md, MODINFOMD_DEPLIST);
} while (md);
return (error);
}
/*
@ -433,6 +426,17 @@ mod_findmetadata(struct loaded_module *mp, int type)
return(md);
}
struct module_metadata *
metadata_next(struct module_metadata *md, int type)
{
if (md == NULL)
return (NULL);
while((md = md->md_next) != NULL)
if (md->md_type == type)
break;
return (md);
}
/*
* Attempt to find the file (name) on the module searchpath.
* If (name) is qualified in any way, we simply check it and