[RFC PATCH 3/3] export symbol report: export-type enhancement to modpost.c
From: Ram Pai
Date: Thu Apr 20 2006 - 18:37:41 EST
This optional patch, provide the ability to identify the export-type of each
exported symbols.
NOTE: this patch updates the Module.symvers file with the additional
information as shown below.
0x0f8b92af platform_device_add_resources vmlinux EXPORT_GPL_ONLY
0xcf7efb2a ethtool_op_set_tx_csum vmlinux EXPORT_ALL
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Avantika Mathur <mathur@xxxxxxxxxx>
Index: 2617rc1/scripts/mod/modpost.c
===================================================================
--- 2617rc1.orig/scripts/mod/modpost.c 2006-04-02 20:22:10.000000000 -0700
+++ 2617rc1/scripts/mod/modpost.c 2006-04-18 16:15:15.000000000 -0700
@@ -18,6 +18,10 @@
int modversions = 0;
/* Warn about undefined symbols? (do so if we have vmlinux) */
int have_vmlinux = 0;
+
+/* number of the section corresponding to gpl symbols */
+int ksymtab_gpl = -1;
+
/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
static int all_versions = 0;
/* If we are modposting external module set to 1 */
@@ -118,6 +122,7 @@
unsigned int kernel:1; /* 1 if symbol is from kernel
* (only for external modules) **/
unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
+ int export_type;
char name[0];
};
@@ -153,7 +158,8 @@
}
/* For the hash of exported symbols */
-static struct symbol *new_symbol(const char *name, struct module *module)
+static struct symbol *new_symbol(const char *name, struct module *module,
+ int export_type)
{
unsigned int hash;
struct symbol *new;
@@ -161,6 +167,7 @@
hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
new->module = module;
+ new->export_type = export_type;
return new;
}
@@ -183,12 +190,13 @@
* Add an exported symbol - it may have already been added without a
* CRC, in this case just update the CRC
**/
-static struct symbol *sym_add_exported(const char *name, struct module *mod)
+static struct symbol *sym_add_exported(const char *name, struct module *mod,
+ int export_type)
{
struct symbol *s = find_symbol(name);
if (!s) {
- s = new_symbol(name, mod);
+ s = new_symbol(name, mod, export_type);
} else {
if (!s->preloaded) {
warn("%s: '%s' exported twice. Previous export "
@@ -204,12 +212,12 @@
}
static void sym_update_crc(const char *name, struct module *mod,
- unsigned int crc)
+ unsigned int crc, int export_type)
{
struct symbol *s = find_symbol(name);
if (!s)
- s = new_symbol(name, mod);
+ s = new_symbol(name, mod, export_type);
s->crc = crc;
s->crc_valid = 1;
}
@@ -305,17 +313,23 @@
sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
}
+
+ ksymtab_gpl = -1;
/* Find symbol table. */
for (i = 1; i < hdr->e_shnum; i++) {
const char *secstrings
= (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+ const char *secname;
if (sechdrs[i].sh_offset > info->size)
goto truncated;
- if (strcmp(secstrings+sechdrs[i].sh_name, ".modinfo") == 0) {
+ secname = secstrings+sechdrs[i].sh_name;
+ if (strcmp(secname, ".modinfo") == 0) {
info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
info->modinfo_len = sechdrs[i].sh_size;
- }
+ } else if (strcmp(secname, "__ksymtab_gpl") == 0)
+ ksymtab_gpl = i;
+
if (sechdrs[i].sh_type != SHT_SYMTAB)
continue;
@@ -348,11 +362,15 @@
#define CRC_PFX MODULE_SYMBOL_PREFIX "__crc_"
#define KSYMTAB_PFX MODULE_SYMBOL_PREFIX "__ksymtab_"
+#define EXPORT_GPL_ONLY 1
+#define EXPORT_ALL 0
static void handle_modversions(struct module *mod, struct elf_info *info,
Elf_Sym *sym, const char *symname)
{
unsigned int crc;
+ unsigned int export_type = (sym->st_shndx == ksymtab_gpl ?
+ EXPORT_GPL_ONLY : EXPORT_ALL);
switch (sym->st_shndx) {
case SHN_COMMON:
@@ -362,7 +380,8 @@
/* CRC'd symbol */
if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
crc = (unsigned int) sym->st_value;
- sym_update_crc(symname + strlen(CRC_PFX), mod, crc);
+ sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
+ export_type);
}
break;
case SHN_UNDEF:
@@ -406,7 +425,8 @@
default:
/* All exported symbols */
if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
- sym_add_exported(symname + strlen(KSYMTAB_PFX), mod);
+ sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
+ export_type);
}
if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
mod->has_init = 1;
@@ -1098,10 +1118,11 @@
return;
while ((line = get_next_line(&pos, file, size))) {
- char *symname, *modname, *d;
+ char *symname, *modname, *d, *export;
unsigned int crc;
struct module *mod;
struct symbol *s;
+ unsigned int export_type = 0;
if (!(symname = strchr(line, '\t')))
goto fail;
@@ -1109,12 +1130,19 @@
if (!(modname = strchr(symname, '\t')))
goto fail;
*modname++ = '\0';
- if (strchr(modname, '\t'))
+ if (!(export = strchr(modname, '\t')))
+ goto fail;
+ *export++ = '\0';
+ if (strchr(export, '\t'))
goto fail;
crc = strtoul(line, &d, 16);
- if (*symname == '\0' || *modname == '\0' || *d != '\0')
+ if (*symname == '\0' || *modname == '\0' || *export == '\0' ||
+ *d != '\0')
goto fail;
+ if (!(strcmp(export, "EXPORT_GPL_ONLY")))
+ export_type = 1;
+
if (!(mod = find_module(modname))) {
if (is_vmlinux(modname)) {
have_vmlinux = 1;
@@ -1122,10 +1150,10 @@
mod = new_module(NOFAIL(strdup(modname)));
mod->skip = 1;
}
- s = sym_add_exported(symname, mod);
+ s = sym_add_exported(symname, mod, export_type);
s->kernel = kernel;
s->preloaded = 1;
- sym_update_crc(symname, mod, crc);
+ sym_update_crc(symname, mod, crc, export_type);
}
return;
fail:
@@ -1155,9 +1183,11 @@
symbol = symbolhash[n];
while (symbol) {
if (dump_sym(symbol))
- buf_printf(&buf, "0x%08x\t%s\t%s\n",
+ buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
symbol->crc, symbol->name,
- symbol->module->name);
+ symbol->module->name,
+ (symbol->export_type?
+ "EXPORT_GPL_ONLY" : "EXPORT_ALL"));
symbol = symbol->next;
}
}
-
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