# SPDX-License-Identifier: GPL-2.0
generated-y += syscall_table.h
+generic-y += export.h
generic-y += extable.h
generic-y += kvm_para.h
generic-y += mcs_spinlock.h
+++ /dev/null
-#define KCRC_ALIGN 2
-#include <asm-generic/export.h>
bool "Build a relocatable kernel"
depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
select NONSTATIC_KERNEL
- select MODULE_REL_CRCS if MODVERSIONS
help
This builds a kernel image that is capable of running at the
location the kernel is loaded at. For ppc32, there is no any
config RELOCATABLE
bool "Build a relocatable kernel"
- select MODULE_REL_CRCS if MODVERSIONS
default y
help
This builds a kernel image that retains relocation information
bool
default y
depends on !LD_SCRIPT_STATIC
- select MODULE_REL_CRCS if MODVERSIONS
config LD_SCRIPT_DYN_RPATH
bool "set rpath in the binary" if EXPERT
#ifndef __ASM_GENERIC_EXPORT_H
#define __ASM_GENERIC_EXPORT_H
+/*
+ * This comment block is used by fixdep. Please do not remove.
+ *
+ * When CONFIG_MODVERSIONS is changed from n to y, all source files having
+ * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
+ * side effect of the *.o build rule.
+ */
+
#ifndef KSYM_FUNC
#define KSYM_FUNC(x) x
#endif
#else
#define KSYM_ALIGN 4
#endif
-#ifndef KCRC_ALIGN
-#define KCRC_ALIGN 4
-#endif
.macro __put, val, name
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
__kstrtab_\name:
.asciz "\name"
.previous
-#ifdef CONFIG_MODVERSIONS
- .section ___kcrctab\sec+\name,"a"
- .balign KCRC_ALIGN
-#if defined(CONFIG_MODULE_REL_CRCS)
- .long __crc_\name - .
-#else
- .long __crc_\name
-#endif
- .weak __crc_\name
- .previous
-#endif
#endif
.endm
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Please do not include this explicitly.
+ * This is used by C files generated by modpost.
+ */
+
+#ifndef __LINUX_EXPORT_INTERNAL_H__
+#define __LINUX_EXPORT_INTERNAL_H__
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+/* __used is needed to keep __crc_* for LTO */
+#define SYMBOL_CRC(sym, crc, sec) \
+ u32 __section("___kcrctab" sec "+" #sym) __used __crc_##sym = crc
+
+#endif /* __LINUX_EXPORT_INTERNAL_H__ */
* hackers place grumpy comments in header files.
*/
+/*
+ * This comment block is used by fixdep. Please do not remove.
+ *
+ * When CONFIG_MODVERSIONS is changed from n to y, all source files having
+ * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
+ * side effect of the *.o build rule.
+ */
+
#ifndef __ASSEMBLY__
#ifdef MODULE
extern struct module __this_module;
#define THIS_MODULE ((struct module *)0)
#endif
-#ifdef CONFIG_MODVERSIONS
-/* Mark the CRC weak since genksyms apparently decides not to
- * generate a checksums for some symbols */
-#if defined(CONFIG_MODULE_REL_CRCS)
-#define __CRC_SYMBOL(sym, sec) \
- asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
- " .weak __crc_" #sym " \n" \
- " .long __crc_" #sym " - . \n" \
- " .previous \n")
-#else
-#define __CRC_SYMBOL(sym, sec) \
- asm(" .section \"___kcrctab" sec "+" #sym "\", \"a\" \n" \
- " .weak __crc_" #sym " \n" \
- " .long __crc_" #sym " \n" \
- " .previous \n")
-#endif
-#else
-#define __CRC_SYMBOL(sym, sec)
-#endif
-
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
#include <linux/compiler.h>
/*
/*
* For every exported symbol, do the following:
*
- * - If applicable, place a CRC entry in the __kcrctab section.
* - Put the name of the symbol and namespace (empty string "" for none) in
* __ksymtab_strings.
* - Place a struct kernel_symbol entry in the __ksymtab section.
extern typeof(sym) sym; \
extern const char __kstrtab_##sym[]; \
extern const char __kstrtabns_##sym[]; \
- __CRC_SYMBOL(sym, sec); \
asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1 \n" \
"__kstrtab_" #sym ": \n" \
" .asciz \"" #sym "\" \n" \
assembly. This can be enabled only when the target architecture
supports it.
-config MODULE_REL_CRCS
- bool
- depends on MODVERSIONS
-
config MODULE_SRCVERSION_ALL
bool "Source checksum for all modules"
help
#ifdef CONFIG_MODVERSIONS
-static u32 resolve_rel_crc(const s32 *crc)
-{
- return *(u32 *)((void *)crc + *crc);
-}
-
static int check_version(const struct load_info *info,
const char *symname,
struct module *mod,
if (strcmp(versions[i].name, symname) != 0)
continue;
- if (IS_ENABLED(CONFIG_MODULE_REL_CRCS))
- crcval = resolve_rel_crc(crc);
- else
- crcval = *crc;
+ crcval = *crc;
if (versions[i].crc == crcval)
return 1;
pr_debug("Found checksum %X vs module %lX\n",
genksyms = scripts/genksyms/genksyms \
$(if $(1), -T $(2)) \
- $(if $(CONFIG_MODULE_REL_CRCS), -R) \
$(if $(KBUILD_PRESERVE), -p) \
-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
# o if <file>.o doesn't contain a __ksymtab version, i.e. does
# not export symbols, it's done.
# o otherwise, we calculate symbol versions using the good old
-# genksyms on the preprocessed source and postprocess them in a way
-# that they are usable as a linker script
-# o generate .tmp_<file>.o from <file>.o using the linker to
-# replace the unresolved symbols __crc_exported_symbol with
-# the actual value of the checksum generated by genksyms
-# o remove .tmp_<file>.o to <file>.o
+# genksyms on the preprocessed source and dump them into the .cmd file.
+# o modpost will extract versions from that file and create *.c files that will
+# be compiled and linked to the kernel and/or modules.
-# Generate .o.symversions files for each .o with exported symbols, and link these
-# to the kernel and/or modules at the end.
-
-genksyms_format_rel_crc := [^_]*__crc_\([^ ]*\) = \.; LONG(\([^)]*\)).*
-genksyms_format_normal := __crc_\(.*\) = \(.*\);
-genksyms_format := $(if $(CONFIG_MODULE_REL_CRCS),$(genksyms_format_rel_crc),$(genksyms_format_normal))
+genksyms_format := __crc_\(.*\) = \(.*\);
gen_symversions = \
if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
cmd_gen_symversions_c = $(call gen_symversions,c)
-cmd_modversions = \
- if [ -r $@.symversions ]; then \
- $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
- -T $@.symversions; \
- mv -f $(@D)/.tmp_$(@F) $@; \
- fi
endif
ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
$(call cmd,checkdoc)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_c)
- $(if $(CONFIG_LTO_CLANG),,$(call cmd,modversions))
$(call cmd,record_mcount)
endef
$(call cmd,gen_ksymdeps)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_S)
- $(call cmd,modversions)
endef
# Built-in and composite module parts
quiet_cmd_cc_prelink_modules = LD [M] $@
cmd_cc_prelink_modules = \
$(LD) $(ld_flags) -r -o $@ \
- $(shell [ -s $(@:.prelink.o=.o.symversions) ] && \
- echo -T $(@:.prelink.o=.o.symversions)) \
--whole-archive $(filter-out FORCE,$^) \
$(cmd_objtool)
--- /dev/null
+# SPDX-License-Identifier: GPL-2.0-only
+
+include include/config/auto.conf
+include $(srctree)/scripts/Kbuild.include
+
+# for c_flags
+include $(srctree)/scripts/Makefile.lib
+
+quiet_cmd_cc_o_c = CC $@
+ cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
+
+%.o: %.c FORCE
+ $(call if_changed_dep,cc_o_c)
+
+targets := $(MAKECMDGOALS)
+
+# Add FORCE to the prequisites of a target to force it to be always rebuilt.
+# ---------------------------------------------------------------------------
+
+PHONY += FORCE
+FORCE:
+
+# Read all saved command lines and dependencies for the $(targets) we
+# may be building above, using $(if_changed{,_dep}). As an
+# optimization, we don't need to read them if the target does not
+# exist, we will rebuild anyway in that case.
+
+existing-targets := $(wildcard $(sort $(targets)))
+
+-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
+
+.PHONY: $(PHONY)
int in_source_file;
static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
- flag_preserve, flag_warnings, flag_rel_crcs;
+ flag_preserve, flag_warnings;
static int errors;
static int nsyms;
if (flag_dump_defs)
fputs(">\n", debugfile);
- /* Used as a linker script. */
- printf(!flag_rel_crcs ? "__crc_%s = 0x%08lx;\n" :
- "SECTIONS { .rodata : ALIGN(4) { "
- "__crc_%s = .; LONG(0x%08lx); } }\n",
- name, crc);
+ printf("__crc_%s = 0x%08lx;\n", name, crc);
}
}
" -q, --quiet Disable warnings (default)\n"
" -h, --help Print this message\n"
" -V, --version Print the release version\n"
- " -R, --relative-crc Emit section relative symbol CRCs\n"
#else /* __GNU_LIBRARY__ */
" -s Select symbol prefix\n"
" -d Increment the debug level (repeatable)\n"
" -q Disable warnings (default)\n"
" -h Print this message\n"
" -V Print the release version\n"
- " -R Emit section relative symbol CRCs\n"
#endif /* __GNU_LIBRARY__ */
, stderr);
}
{"preserve", 0, 0, 'p'},
{"version", 0, 0, 'V'},
{"help", 0, 0, 'h'},
- {"relative-crc", 0, 0, 'R'},
{0, 0, 0, 0}
};
- while ((o = getopt_long(argc, argv, "s:dwqVDr:T:phR",
+ while ((o = getopt_long(argc, argv, "s:dwqVDr:T:ph",
&long_opts[0], NULL)) != EOF)
#else /* __GNU_LIBRARY__ */
- while ((o = getopt(argc, argv, "s:dwqVDr:T:phR")) != EOF)
+ while ((o = getopt(argc, argv, "s:dwqVDr:T:ph")) != EOF)
#endif /* __GNU_LIBRARY__ */
switch (o) {
case 'd':
case 'h':
genksyms_usage();
return 0;
- case 'R':
- flag_rel_crcs = 1;
- break;
default:
genksyms_usage();
return 1;
if is_enabled CONFIG_MODVERSIONS; then
gen_symversions
- lds="${lds} -T .tmp_symversions.lds"
fi
# This might take a while, so indicate that we're doing
libs="${KBUILD_VMLINUX_LIBS}"
fi
+ if is_enabled CONFIG_MODULES; then
+ objs="${objs} .vmlinux.export.o"
+ fi
+
if [ "${SRCARCH}" = "um" ]; then
wl=-Wl,
ld="${CC}"
rm -f vmlinux.o
rm -f .vmlinux.d
rm -f .vmlinux.objs
+ rm -f .vmlinux.export.c
}
# Use "make V=1" to debug this script
tr '\0' '\n' < modules.builtin.modinfo | sed -n 's/^[[:alnum:]:_]*\.file=//p' |
tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$/.ko/' > modules.builtin
+if is_enabled CONFIG_MODULES; then
+ ${MAKE} -f "${srctree}/scripts/Makefile.vmlinux" .vmlinux.export.o
+fi
+
btf_vmlinux_bin_o=""
if is_enabled CONFIG_DEBUG_INFO_BTF; then
btf_vmlinux_bin_o=.btf.vmlinux.bin.o
buf_printf(b, "#define INCLUDE_VERMAGIC\n");
buf_printf(b, "#include <linux/build-salt.h>\n");
buf_printf(b, "#include <linux/elfnote-lto.h>\n");
+ buf_printf(b, "#include <linux/export-internal.h>\n");
buf_printf(b, "#include <linux/vermagic.h>\n");
buf_printf(b, "#include <linux/compiler.h>\n");
buf_printf(b, "\n");
buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
}
-static void check_symversions(struct module *mod)
+static void add_exported_symbols(struct buffer *buf, struct module *mod)
{
struct symbol *sym;
if (!modversions)
return;
+ /* record CRCs for exported symbols */
+ buf_printf(buf, "\n");
list_for_each_entry(sym, &mod->exported_symbols, list) {
if (!sym->crc_valid) {
warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n"
"Is \"%s\" prototyped in <asm/asm-prototypes.h>?\n",
sym->name, mod->name, mod->is_vmlinux ? "" : ".ko",
sym->name);
+ continue;
}
+
+ buf_printf(buf, "SYMBOL_CRC(%s, 0x%08x, \"%s\");\n",
+ sym->name, sym->crc, sym->is_gpl_only ? "_gpl" : "");
}
}
write_buf(b, fname);
}
+static void write_vmlinux_export_c_file(struct module *mod)
+{
+ struct buffer buf = { };
+
+ buf_printf(&buf,
+ "#include <linux/export-internal.h>\n");
+
+ add_exported_symbols(&buf, mod);
+ write_if_changed(&buf, ".vmlinux.export.c");
+ free(buf.p);
+}
+
/* do sanity checks, and generate *.mod.c file */
static void write_mod_c_file(struct module *mod)
{
check_exports(mod);
add_header(&buf, mod);
+ add_exported_symbols(&buf, mod);
add_versions(&buf, mod);
add_depends(&buf, mod);
add_moddevtable(&buf, mod);
if (mod->from_dump)
continue;
- check_symversions(mod);
-
- if (!mod->is_vmlinux)
+ if (mod->is_vmlinux)
+ write_vmlinux_export_c_file(mod);
+ else
write_mod_c_file(mod);
}
projects / kernel.git / commitdiff