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Diffstat (limited to 'scripts/mod/modpost.c')
-rw-r--r--scripts/mod/modpost.c151
1 files changed, 123 insertions, 28 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index fb787a5715f5..c35d22607978 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -33,6 +33,10 @@ static bool module_enabled;
static bool modversions;
/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
static bool all_versions;
+/* Is CONFIG_BASIC_MODVERSIONS set? */
+static bool basic_modversions;
+/* Is CONFIG_EXTENDED_MODVERSIONS set? */
+static bool extended_modversions;
/* If we are modposting external module set to 1 */
static bool external_module;
/* Only warn about unresolved symbols */
@@ -155,12 +159,13 @@ char *get_line(char **stringp)
/* A list of all modules we processed */
LIST_HEAD(modules);
-static struct module *find_module(const char *modname)
+static struct module *find_module(const char *filename, const char *modname)
{
struct module *mod;
list_for_each_entry(mod, &modules, list) {
- if (strcmp(mod->name, modname) == 0)
+ if (!strcmp(mod->dump_file, filename) &&
+ !strcmp(mod->name, modname))
return mod;
}
return NULL;
@@ -185,8 +190,8 @@ static struct module *new_module(const char *name, size_t namelen)
/*
* Set mod->is_gpl_compatible to true by default. If MODULE_LICENSE()
- * is missing, do not check the use for EXPORT_SYMBOL_GPL() becasue
- * modpost will exit wiht error anyway.
+ * is missing, do not check the use for EXPORT_SYMBOL_GPL() because
+ * modpost will exit with an error anyway.
*/
mod->is_gpl_compatible = true;
@@ -502,6 +507,9 @@ static int parse_elf(struct elf_info *info, const char *filename)
info->modinfo_len = sechdrs[i].sh_size;
} else if (!strcmp(secname, ".export_symbol")) {
info->export_symbol_secndx = i;
+ } else if (!strcmp(secname, ".no_trim_symbol")) {
+ info->no_trim_symbol = (void *)hdr + sechdrs[i].sh_offset;
+ info->no_trim_symbol_len = sechdrs[i].sh_size;
}
if (sechdrs[i].sh_type == SHT_SYMTAB) {
@@ -1137,9 +1145,9 @@ static Elf_Addr addend_386_rel(uint32_t *location, unsigned int r_type)
{
switch (r_type) {
case R_386_32:
- return TO_NATIVE(*location);
+ return get_unaligned_native(location);
case R_386_PC32:
- return TO_NATIVE(*location) + 4;
+ return get_unaligned_native(location) + 4;
}
return (Elf_Addr)(-1);
@@ -1160,24 +1168,24 @@ static Elf_Addr addend_arm_rel(void *loc, Elf_Sym *sym, unsigned int r_type)
switch (r_type) {
case R_ARM_ABS32:
case R_ARM_REL32:
- inst = TO_NATIVE(*(uint32_t *)loc);
+ inst = get_unaligned_native((uint32_t *)loc);
return inst + sym->st_value;
case R_ARM_MOVW_ABS_NC:
case R_ARM_MOVT_ABS:
- inst = TO_NATIVE(*(uint32_t *)loc);
+ inst = get_unaligned_native((uint32_t *)loc);
offset = sign_extend32(((inst & 0xf0000) >> 4) | (inst & 0xfff),
15);
return offset + sym->st_value;
case R_ARM_PC24:
case R_ARM_CALL:
case R_ARM_JUMP24:
- inst = TO_NATIVE(*(uint32_t *)loc);
+ inst = get_unaligned_native((uint32_t *)loc);
offset = sign_extend32((inst & 0x00ffffff) << 2, 25);
return offset + sym->st_value + 8;
case R_ARM_THM_MOVW_ABS_NC:
case R_ARM_THM_MOVT_ABS:
- upper = TO_NATIVE(*(uint16_t *)loc);
- lower = TO_NATIVE(*((uint16_t *)loc + 1));
+ upper = get_unaligned_native((uint16_t *)loc);
+ lower = get_unaligned_native((uint16_t *)loc + 1);
offset = sign_extend32(((upper & 0x000f) << 12) |
((upper & 0x0400) << 1) |
((lower & 0x7000) >> 4) |
@@ -1194,8 +1202,8 @@ static Elf_Addr addend_arm_rel(void *loc, Elf_Sym *sym, unsigned int r_type)
* imm11 = lower[10:0]
* imm32 = SignExtend(S:J2:J1:imm6:imm11:'0')
*/
- upper = TO_NATIVE(*(uint16_t *)loc);
- lower = TO_NATIVE(*((uint16_t *)loc + 1));
+ upper = get_unaligned_native((uint16_t *)loc);
+ lower = get_unaligned_native((uint16_t *)loc + 1);
sign = (upper >> 10) & 1;
j1 = (lower >> 13) & 1;
@@ -1218,8 +1226,8 @@ static Elf_Addr addend_arm_rel(void *loc, Elf_Sym *sym, unsigned int r_type)
* I2 = NOT(J2 XOR S)
* imm32 = SignExtend(S:I1:I2:imm10:imm11:'0')
*/
- upper = TO_NATIVE(*(uint16_t *)loc);
- lower = TO_NATIVE(*((uint16_t *)loc + 1));
+ upper = get_unaligned_native((uint16_t *)loc);
+ lower = get_unaligned_native((uint16_t *)loc + 1);
sign = (upper >> 10) & 1;
j1 = (lower >> 13) & 1;
@@ -1240,7 +1248,7 @@ static Elf_Addr addend_mips_rel(uint32_t *location, unsigned int r_type)
{
uint32_t inst;
- inst = TO_NATIVE(*location);
+ inst = get_unaligned_native(location);
switch (r_type) {
case R_MIPS_LO16:
return inst & 0xffff;
@@ -1561,6 +1569,14 @@ static void read_symbols(const char *modname)
/* strip trailing .o */
mod = new_module(modname, strlen(modname) - strlen(".o"));
+ /* save .no_trim_symbol section for later use */
+ if (info.no_trim_symbol_len) {
+ mod->no_trim_symbol = xmalloc(info.no_trim_symbol_len);
+ memcpy(mod->no_trim_symbol, info.no_trim_symbol,
+ info.no_trim_symbol_len);
+ mod->no_trim_symbol_len = info.no_trim_symbol_len;
+ }
+
if (!mod->is_vmlinux) {
license = get_modinfo(&info, "license");
if (!license)
@@ -1723,6 +1739,28 @@ static void handle_white_list_exports(const char *white_list)
free(buf);
}
+/*
+ * Keep symbols recorded in the .no_trim_symbol section. This is necessary to
+ * prevent CONFIG_TRIM_UNUSED_KSYMS from dropping EXPORT_SYMBOL because
+ * symbol_get() relies on the symbol being present in the ksymtab for lookups.
+ */
+static void keep_no_trim_symbols(struct module *mod)
+{
+ unsigned long size = mod->no_trim_symbol_len;
+
+ for (char *s = mod->no_trim_symbol; s; s = next_string(s , &size)) {
+ struct symbol *sym;
+
+ /*
+ * If find_symbol() returns NULL, this symbol is not provided
+ * by any module, and symbol_get() will fail.
+ */
+ sym = find_symbol(s);
+ if (sym)
+ sym->used = true;
+ }
+}
+
static void check_modname_len(struct module *mod)
{
const char *mod_name;
@@ -1805,13 +1843,56 @@ static void add_exported_symbols(struct buffer *buf, struct module *mod)
}
/**
+ * Record CRCs for unresolved symbols, supporting long names
+ */
+static void add_extended_versions(struct buffer *b, struct module *mod)
+{
+ struct symbol *s;
+
+ if (!extended_modversions)
+ return;
+
+ buf_printf(b, "\n");
+ buf_printf(b, "static const u32 ____version_ext_crcs[]\n");
+ buf_printf(b, "__used __section(\"__version_ext_crcs\") = {\n");
+ list_for_each_entry(s, &mod->unresolved_symbols, list) {
+ if (!s->module)
+ continue;
+ if (!s->crc_valid) {
+ warn("\"%s\" [%s.ko] has no CRC!\n",
+ s->name, mod->name);
+ continue;
+ }
+ buf_printf(b, "\t0x%08x,\n", s->crc);
+ }
+ buf_printf(b, "};\n");
+
+ buf_printf(b, "static const char ____version_ext_names[]\n");
+ buf_printf(b, "__used __section(\"__version_ext_names\") =\n");
+ list_for_each_entry(s, &mod->unresolved_symbols, list) {
+ if (!s->module)
+ continue;
+ if (!s->crc_valid)
+ /*
+ * We already warned on this when producing the crc
+ * table.
+ * We need to skip its name too, as the indexes in
+ * both tables need to align.
+ */
+ continue;
+ buf_printf(b, "\t\"%s\\0\"\n", s->name);
+ }
+ buf_printf(b, ";\n");
+}
+
+/**
* Record CRCs for unresolved symbols
**/
static void add_versions(struct buffer *b, struct module *mod)
{
struct symbol *s;
- if (!modversions)
+ if (!basic_modversions)
return;
buf_printf(b, "\n");
@@ -1827,11 +1908,16 @@ static void add_versions(struct buffer *b, struct module *mod)
continue;
}
if (strlen(s->name) >= MODULE_NAME_LEN) {
- error("too long symbol \"%s\" [%s.ko]\n",
- s->name, mod->name);
- break;
+ if (extended_modversions) {
+ /* this symbol will only be in the extended info */
+ continue;
+ } else {
+ error("too long symbol \"%s\" [%s.ko]\n",
+ s->name, mod->name);
+ break;
+ }
}
- buf_printf(b, "\t{ %#8x, \"%s\" },\n",
+ buf_printf(b, "\t{ 0x%08x, \"%s\" },\n",
s->crc, s->name);
}
@@ -1960,6 +2046,7 @@ static void write_mod_c_file(struct module *mod)
add_header(&buf, mod);
add_exported_symbols(&buf, mod);
add_versions(&buf, mod);
+ add_extended_versions(&buf, mod);
add_depends(&buf, mod);
buf_printf(&buf, "\n");
@@ -2030,10 +2117,10 @@ static void read_dump(const char *fname)
continue;
}
- mod = find_module(modname);
+ mod = find_module(fname, modname);
if (!mod) {
mod = new_module(modname, strlen(modname));
- mod->from_dump = true;
+ mod->dump_file = fname;
}
s = sym_add_exported(symname, mod, gpl_only, namespace);
sym_set_crc(s, crc);
@@ -2052,7 +2139,7 @@ static void write_dump(const char *fname)
struct symbol *sym;
list_for_each_entry(mod, &modules, list) {
- if (mod->from_dump)
+ if (mod->dump_file)
continue;
list_for_each_entry(sym, &mod->exported_symbols, list) {
if (trim_unused_exports && !sym->used)
@@ -2076,7 +2163,7 @@ static void write_namespace_deps_files(const char *fname)
list_for_each_entry(mod, &modules, list) {
- if (mod->from_dump || list_empty(&mod->missing_namespaces))
+ if (mod->dump_file || list_empty(&mod->missing_namespaces))
continue;
buf_printf(&ns_deps_buf, "%s.ko:", mod->name);
@@ -2125,7 +2212,7 @@ int main(int argc, char **argv)
LIST_HEAD(dump_lists);
struct dump_list *dl, *dl2;
- while ((opt = getopt(argc, argv, "ei:MmnT:to:au:WwENd:")) != -1) {
+ while ((opt = getopt(argc, argv, "ei:MmnT:to:au:WwENd:xb")) != -1) {
switch (opt) {
case 'e':
external_module = true;
@@ -2174,6 +2261,12 @@ int main(int argc, char **argv)
case 'd':
missing_namespace_deps = optarg;
break;
+ case 'b':
+ basic_modversions = true;
+ break;
+ case 'x':
+ extended_modversions = true;
+ break;
default:
exit(1);
}
@@ -2194,7 +2287,9 @@ int main(int argc, char **argv)
read_symbols_from_files(files_source);
list_for_each_entry(mod, &modules, list) {
- if (mod->from_dump || mod->is_vmlinux)
+ keep_no_trim_symbols(mod);
+
+ if (mod->dump_file || mod->is_vmlinux)
continue;
check_modname_len(mod);
@@ -2205,7 +2300,7 @@ int main(int argc, char **argv)
handle_white_list_exports(unused_exports_white_list);
list_for_each_entry(mod, &modules, list) {
- if (mod->from_dump)
+ if (mod->dump_file)
continue;
if (mod->is_vmlinux)
generated by cgit v1.2.3 (git 2.39.0) at 2025-05-07 19:40:25 +0300