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/* Load the given section: NULL on error. */
static void *PERBIT(load_section)(ElfPERBIT(Ehdr) *hdr,
const char *secname,
unsigned long *size)
{
ElfPERBIT(Shdr) *sechdrs;
unsigned int i;
char *secnames;
/* Grab section headers and strings so we can tell who is who */
sechdrs = (void *)hdr + hdr->e_shoff;
secnames = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
/* Find the section they want */
for (i = 1; i < hdr->e_shnum; i++) {
if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
*size = sechdrs[i].sh_size;
return (void *)hdr + sechdrs[i].sh_offset;
}
}
*size = 0;
return NULL;
}
static void PERBIT(load_symbols)(struct module *module)
{
struct PERBIT(kernel_symbol) *ksyms;
char *ksymstrings;
unsigned long i, size;
/* New-style: strings are in this section. */
ksymstrings = PERBIT(load_section)(module->data, "__ksymtab_strings",
&size);
if (ksymstrings) {
unsigned int i = 0;
for (;;) {
/* Skip any zero padding. */
while (!ksymstrings[i])
if (++i >= size)
return;
add_symbol(ksymstrings+i, module);
i += strlen(ksymstrings+i);
}
/* GPL symbols too */
ksymstrings = PERBIT(load_section)(module->data,
"__ksymtab_strings_gpl",
&size);
for (;;) {
/* Skip any zero padding. */
while (!ksymstrings[i])
if (++i >= size)
return;
add_symbol(ksymstrings+i, module);
i += strlen(ksymstrings+i);
}
return;
}
/* Old-style. */
ksyms = PERBIT(load_section)(module->data, "__ksymtab", &size);
for (i = 0; i < size / sizeof(struct PERBIT(kernel_symbol)); i++)
add_symbol(ksyms[i].name, module);
ksyms = PERBIT(load_section)(module->data, "__gpl_ksymtab", &size);
for (i = 0; i < size / sizeof(struct PERBIT(kernel_symbol)); i++)
add_symbol(ksyms[i].name, module);
}
static char *PERBIT(get_aliases)(struct module *module, unsigned long *size)
{
return PERBIT(load_section)(module->data, ".modalias", size);
}
static char *PERBIT(get_modinfo)(struct module *module, unsigned long *size)
{
return PERBIT(load_section)(module->data, ".modinfo", size);
}
#ifndef STT_REGISTER
#define STT_REGISTER 13 /* Global register reserved to app. */
#endif
/* Calculate the dependencies for this module */
static void PERBIT(calculate_deps)(struct module *module, int verbose)
{
unsigned int i;
unsigned long size;
char *strings;
ElfPERBIT(Sym) *syms;
ElfPERBIT(Ehdr) *hdr;
int handle_register_symbols;
strings = PERBIT(load_section)(module->data, ".strtab", &size);
syms = PERBIT(load_section)(module->data, ".symtab", &size);
if (!strings || !syms) {
warn("Couldn't find symtab and strtab in module %s\n",
module->pathname);
return;
}
hdr = module->data;
handle_register_symbols = 0;
if (hdr->e_machine == EM_SPARC ||
hdr->e_machine == EM_SPARCV9)
handle_register_symbols = 1;
module->num_deps = 0;
module->deps = NULL;
for (i = 1; i < size / sizeof(syms[0]); i++) {
if (syms[i].st_shndx == SHN_UNDEF) {
/* Look for symbol */
const char *name = strings + syms[i].st_name;
struct module *owner;
int weak;
/* Not really undefined: sparc gcc 3.3 creates
U references when you have global asm
variables, to avoid anyone else mising
them. */
if (handle_register_symbols
&& (ELFPERBIT(ST_TYPE)(syms[i].st_info)
== STT_REGISTER))
continue;
weak = ELFPERBIT(ST_BIND)(syms[i].st_info) == STB_WEAK;
owner = find_symbol(name, module->pathname, weak);
if (owner) {
if (verbose)
printf("%s needs \"%s\": %s\n",
module->pathname, name,
owner->pathname);
add_dep(module, owner);
}
}
}
}
static void *PERBIT(deref_sym)(ElfPERBIT(Ehdr) *hdr, const char *name)
{
unsigned int i;
unsigned long size;
char *strings;
ElfPERBIT(Sym) *syms;
ElfPERBIT(Shdr) *sechdrs;
sechdrs = (void *)hdr + hdr->e_shoff;
strings = PERBIT(load_section)(hdr, ".strtab", &size);
syms = PERBIT(load_section)(hdr, ".symtab", &size);
/* Don't warn again: we already have above */
if (!strings || !syms)
return NULL;
for (i = 0; i < size / sizeof(syms[0]); i++) {
if (strcmp(strings + syms[i].st_name, name) == 0) {
return (void *)hdr
+ sechdrs[syms[i].st_shndx].sh_offset
+ syms[i].st_value;
}
}
return NULL;
}
struct module_ops PERBIT(mod_ops) = {
.load_symbols = PERBIT(load_symbols),
.calculate_deps = PERBIT(calculate_deps),
.get_aliases = PERBIT(get_aliases),
.get_modinfo = PERBIT(get_modinfo),
};
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