[PATCH v2 PING] kallsyms: new /proc/kallmodsyms with builtin modules and symbol sizes

[Nick Alcock <nick.alcock@xxxxxxxxxx>]

/proc/kallsyms is very useful for tracers and other tools that need to
map kernel symbols to addresses.

It would be useful if:

- there were a mapping between kernel symbol and module name that only
  changed when the kernel source code is changed.  This mapping should
  not change simply because a module becomes built into the kernel.

- there were symbol size information to determine whether an address is
  within a symbol or outside it, especially given that there could be
  huge gaps between symbols.

Fix this by introducing a new config parameter CONFIG_KALLMODSYMS, which
does several things at once.

Change scripts/kallsyms.c stdin from "nm" to "nm -S" so that symbol
sizes are available.  Have sort_symbols() incorporate size info.  Emit
size info for each symbol into .kallsyms_sizes in the *.s output file.
Change module_get_kallsym() to return symbol size as well.

Generate a file "modules_thick.builtin" that maps from the thin archives
that make up built-in modules to their constituent object files.  (This
reintroduces the machinery that used to be used to generate
modules.builtin.  I am not wedded to this mechanism: if someone can
figure out a mechanism that does not require recursing over the entire
build tree, I'm happy to use it, but I suspect that no such mechanism
exists, since the only place the mapping from object file to module
exists is in the makefiles themselves. Regardless, this is fairly cheap,
adding less than a second to a typical hot-cache build of a large
enterprise kernel.  This is true even though it needs to be run
unconditionally whenever the .config changes.)

Generate a linker map ".tmp_vmlinux.map", converting it into
".tmp_vmlinux.ranges", mapping address ranges to object files.

Have scripts/kallsyms read these two new files to map symbol addresses
to built-in-module names and then write a mapping from object file
address to module name to the *.s output file.

The mapping consists of three new symbols:

 - .kallsyms_module_addresses/.kallsyms_module_offsets encodes the
   address/offset of each object file (derived from the linker map), in
   exactly the same way as .kallsyms_addresses/.kallsyms_offsets does
   for symbols.  There is no size: instead, the object files are
   assumed to tile the address space.  (This is slightly more
   space-efficient than using a size).  Non-text-section addresses are
   skipped: for now, all the users of this interface only need
   module/non-module information for instruction pointer addresses, not
   absolute-addressed symbols and the like.  This restriction can
   easily be lifted in future.  (For why this isn't called
   .kallsyms_objfiles, see two entries below.)

 - .kallsyms_module_names encodes the name of each module in a modified
   form of strtab: notably, if an object file appears in *multiple*
   modules, all of which are built in, this is encoded via a zero byte,
   a one-byte module count, then a series of that many null-terminated
   strings.  Object files which appear in only one module in such a
   multi-module list are redirected to point inside that list, so that
   modules which contain some object files shared with other modules
   and some object files exclusive to them do not double up the module
   name.  (There might still be some duplication between multiple
   multi-module lists, but this is an extremely marginal size effect,
   and resolving it would require an extra layer of lookup tables which
   would be even more complex, and incompressible to boot).  As a
   special case, the table starts with a single zero byte which does
   *not* represent the start of a multi-module list.

 - .kallsyms_modules connects the two, encoding a table associated 1:1
   with .kallsyms_module_addresses / kallsyms_module_offsets, pointing
   at an offset in .kallsyms_module_names describing which module (or
   modules, for a multi-module list) the code occupying this address
   range is part of.  If an address range is part of no module (always
   built-in) it points at 0 (the null byte at the start of the
   .kallsyms_module_anmes list).  Entries in this list that would
   contain the same value are fused together, along with their
   corresponding .kallsyms_module_addresses/offsets entries.  Due to
   this fusion process, and because object files can be split apart into
   multiple parts by the linker for hot/cold partitioning and the like,
   entries in here do not really correspond to an object file, but more
   to some contiguous range of addresses which are guaranteed to belong
   to a single built-in module: so it seems best to call the symbols
   .kallsyms_modules*.  (The generator has a data structure that does
   correspond more closely to object files, from which .kallsyms_modules
   is generated, and that does use 'objfiles' terminology.)

In kernel/kallsyms, use the new symbol size information in
get_symbol_pos(), both to identify the correct symbol and to return
correct size information.  Emit a new /proc/kallmodsyms file akin to
/proc/kallsyms but with built-in-module names and symbol sizes, using a
new kallsyms_builtin_module_address() almost identical to
kallsyms_sym_address() to get the address corresponding to a given
.kallsyms_modules index, and a new get_builtin_module_idx quite similar
to get_symbol_pos to determine the index in the .kallsyms_modules array
that relates to a given address.  Save a little time by exploiting the
fact that all callers will only ever traverse this list from start to
end by allowing them to pass in the previous index returned from this
function as a hint: thus very few bsearches are actually needed.  (In
theory this could change to just walk straight down
kallsyms_module_addresses/offsets and not bother bsearching at all, but
doing it this way is hardly any slower and much more robust.)

The display process is complicated a little by the weird format of the
.kallsyms_module_names table: we have to look for multimodule entries
and print them as space-separated lists of module names.

The resulting /proc/kallmodsyms file looks like this:
    ffffffff8b013d20 409 t pt_buffer_setup_aux
    ffffffff8b014130 11f T intel_pt_interrupt
    ffffffff8b014250 2d T cpu_emergency_stop_pt
    ffffffff8b014280 13a t rapl_pmu_event_init      [intel_rapl_perf]
    ffffffff8b0143c0 bb t rapl_event_update [intel_rapl_perf]
    ffffffff8b014480 10 t rapl_pmu_event_read       [intel_rapl_perf]
    ffffffff8b014490 a3 t rapl_cpu_offline  [intel_rapl_perf]
    ffffffff8b014540 24 t __rapl_event_show [intel_rapl_perf]
    ffffffff8b014570 f2 t rapl_pmu_event_stop       [intel_rapl_perf]
This is emitted even if intel_rapl_perf is built into the kernel.

Further down, we see what happens when object files are reused by
multiple modules, all of which are built in to the kernel:

ffffffffa22b3aa0 ab t handle_timestamp  [liquidio]
ffffffffa22b3b50 4a t free_netbuf       [liquidio]
ffffffffa22b3ba0 8d t liquidio_ptp_settime      [liquidio]
ffffffffa22b3c30 b3 t liquidio_ptp_adjfreq      [liquidio]
[...]
ffffffffa22b9490 203 t lio_vf_rep_create        [liquidio]
ffffffffa22b96a0 16b t lio_vf_rep_destroy       [liquidio]
ffffffffa22b9810 1f t lio_vf_rep_modinit        [liquidio]
ffffffffa22b9830 1f t lio_vf_rep_modexit        [liquidio]
ffffffffa22b9850 d2 t lio_ethtool_get_channels   [liquidio] [liquidio_vf]
ffffffffa22b9930 9c t lio_ethtool_get_ringparam  [liquidio] [liquidio_vf]
ffffffffa22b99d0 11 t lio_get_msglevel   [liquidio] [liquidio_vf]
ffffffffa22b99f0 11 t lio_vf_set_msglevel        [liquidio] [liquidio_vf]
ffffffffa22b9a10 2b t lio_get_pauseparam         [liquidio] [liquidio_vf]
ffffffffa22b9a40 738 t lio_get_ethtool_stats     [liquidio] [liquidio_vf]
ffffffffa22ba180 368 t lio_vf_get_ethtool_stats  [liquidio] [liquidio_vf]
ffffffffa22ba4f0 37 t lio_get_regs_len   [liquidio] [liquidio_vf]
ffffffffa22ba530 18 t lio_get_priv_flags         [liquidio] [liquidio_vf]
ffffffffa22ba550 2e t lio_set_priv_flags         [liquidio] [liquidio_vf]
ffffffffa22ba580 69 t lio_set_fecparam   [liquidio] [liquidio_vf]
ffffffffa22ba5f0 92 t lio_get_fecparam   [liquidio] [liquidio_vf]
[...]
ffffffffa22cbd10 175 t liquidio_set_mac [liquidio_vf]
ffffffffa22cbe90 ab t handle_timestamp  [liquidio_vf]
ffffffffa22cbf40 4a t free_netbuf       [liquidio_vf]
ffffffffa22cbf90 2b t octnet_link_status_change [liquidio_vf]
ffffffffa22cbfc0 7e t liquidio_vxlan_port_command.constprop.0   [liquidio_vf]

Like /proc/kallsyms, the output is driven by address, so keeps the
curious property of /proc/kallsyms that symbols (like free_netbuf above)
may appear repeatedly with different addresses: but now, unlike in
/proc/kallsyms, we can see that those symbols appear repeatedly because
they are *different symbols* that ultimately belong to different
modules, all of which are built in to the kernel.

Those symbols that come from object files that are genuinely reused and
that appear only once in meory get a /proc/kallmodsyms line with
[multiple] [modules] on it: consumers will have to be ready to handle
such lines.

Also, kernel symbols for built-in modules will probably appear
interspersed with other symbols that are part of different modules and
non-modular always-built-in symbols, which, as usual, have no
square-bracketed module denotation.

As with /proc/kallsyms, non-root usage produces addresses that are
all zero; symbol sizes are treated similarly.

The size impact of all of this is minimal: for the case above, the
kallsyms2.S file went from 14107772 to 14137245 bytes, a gain of 29743
bytes, or 0.16%: vmlinux gained 10824 bytes, a gain of .017%, and the
compressed vmlinux only 7552 bytes, a gain of .08%: though the latter
two values are very configuration-dependent, they seem likely to scale
roughly with the kernel they are part of.

Signed-off-by: Nick Alcock <nick.alcock@xxxxxxxxxx>
Signed-off-by: Eugene Loh <eugene.loh@xxxxxxxxxx>
Reviewed-by: Kris Van Hees <kris.van.hees@xxxxxxxxxx>
---
 .gitignore                  |   1 +
 Documentation/dontdiff      |   1 +
 Makefile                    |  21 +-
 include/linux/module.h      |   7 +-
 init/Kconfig                |   8 +
 kernel/kallsyms.c           | 304 ++++++++++++++---
 kernel/module.c             |   4 +-
 scripts/Kbuild.include      |   6 +
 scripts/Makefile            |   6 +
 scripts/Makefile.modbuiltin |  56 ++++
 scripts/kallsyms.c          | 650 +++++++++++++++++++++++++++++++++++-
 scripts/kconfig/confdata.c  |  41 ++-
 scripts/link-vmlinux.sh     |  23 +-
 scripts/modules_thick.c     | 200 +++++++++++
 scripts/modules_thick.h     |  48 +++
 15 files changed, 1309 insertions(+), 67 deletions(-)
 create mode 100644 scripts/Makefile.modbuiltin
 create mode 100644 scripts/modules_thick.c
 create mode 100644 scripts/modules_thick.h

Differences from v1, a year or so back:

 - Move from a straight symbol->module name mapping to a mapping from
   address-range to TU to module name list, bringing major space savings
   over the previous approach and support for object files used by many
   built-in modules at the same time, at the cost of a slightly more complex
   approach (unavoidably so, I think, given that we have to merge three data
   sources together: the link map in .tmp_vmlinux.ranges, the nm output on
   stdin, and the mapping from TU name to module names in
   modules_thick.builtin).

   We do opportunistic merging of TUs if they cite the same modules and
   reuse module names where doing so is simple: see optimize_obj2mod
   below. I considered more extensive searches for mergeable entries and
   more intricate encodings of the module name list allowing TUs that are
   used by overlapping sets of modules to share their names, but such
   modules are rare enough (and such overlapping sharings are vanishingly
   rare) that it seemed likely to save only a few bytes at the cost of much
   more hard-to-test code. This is doubly true now that the tables needed
   are only a few kilobytes in length.

I am not wedded to using a separate /proc/kallmodsyms file for this, nor to
a config option, nor to the notation for [built-in] [modules]: one I
considered was to put them all in /proc/kallsyms, and use {curly} {braces}
for built-in modules. My worry there was that I didn't know how many
programs this would break, nor how to introduce the size field without
breaking literally everyone. At least using a new file is guaranteed safe.
The size overhead of this is low enough now that dropping the separate
config option might be more acceptable, I suppose...

diff --git a/.gitignore b/.gitignore
index 7afd412dadd2..b49cd96f587a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,6 +49,7 @@
 *.zst
 Module.symvers
 modules.order
+modules_thick.builtin
 
 #
 # Top-level generic files
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 910b30a2a7d9..6a78988547d0 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -183,6 +183,7 @@ modules.builtin
 modules.builtin.modinfo
 modules.nsdeps
 modules.order
+modules_thick.builtin
 modversions.h*
 nconf
 nconf-cfg
diff --git a/Makefile b/Makefile
index 0565caea0362..bbd0b13a8f0b 100644
--- a/Makefile
+++ b/Makefile
@@ -1195,7 +1195,7 @@ cmd_link-vmlinux =                                                 \
 	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
-vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
+vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) modules_thick.builtin FORCE
 	+$(call if_changed_dep,link-vmlinux)
 
 targets := vmlinux
@@ -1496,6 +1496,23 @@ __modinst_pre:
 
 endif # CONFIG_MODULES
 
+# modules_thick.builtin maps from kernel modules (or rather the object file
+# names they would have had had they not been built in) to their constituent
+# object files: we can use this to determine which modules any given object
+# file is part of.  (We cannot eliminate the slight redundancy here without
+# double-expansion.)
+
+modthickbuiltin-files := $(addsuffix /modules_thick.builtin, $(build-dirs))
+
+modules_thick.builtin: $(modthickbuiltin-files)
+	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
+
+# tristate.conf is not included from this Makefile. Add it as a prerequisite
+# here to make it self-healing in case somebody accidentally removes it.
+$(modthickbuiltin-files): include/config/tristate.conf
+	$(Q)$(MAKE) $(modbuiltin)=$(patsubst %/modules_thick.builtin,%,$@) builtin-file=modules_thick.builtin
+
+
 ###
 # Cleaning is done on three levels.
 # make clean     Delete most generated files
@@ -1865,7 +1882,7 @@ clean: $(clean-dirs)
 		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
 		-o -name '*.asn1.[ch]' \
 		-o -name '*.symtypes' -o -name 'modules.order' \
-		-o -name '.tmp_*.o.*' \
+		-o -name '.tmp_*.o.*' -o -name modules_thick.builtin \
 		-o -name '*.c.[012]*.*' \
 		-o -name '*.ll' \
 		-o -name '*.gcno' \
diff --git a/include/linux/module.h b/include/linux/module.h
index 8100bb477d86..8b5d1a7f6d9e 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -579,7 +579,8 @@ struct module *find_module(const char *name);
 /* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
    symnum out of range. */
 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
-			char *name, char *module_name, int *exported);
+		       char *name, char *module_name, unsigned long *size,
+		       int *exported);
 
 /* Look for this name: can be of form module:name. */
 unsigned long module_kallsyms_lookup_name(const char *name);
@@ -756,8 +757,8 @@ static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *
 }
 
 static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
-					char *type, char *name,
-					char *module_name, int *exported)
+				     char *type, char *name, char *module_name,
+				     unsigned long *size, int *exported)
 {
 	return -ERANGE;
 }
diff --git a/init/Kconfig b/init/Kconfig
index a61c92066c2e..1044b00b8361 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1495,6 +1495,14 @@ config POSIX_TIMERS
 
 	  If unsure say y.
 
+config KALLMODSYMS
+	default y
+	bool "Enable support for /proc/kallmodsyms" if EXPERT
+	depends on KALLSYMS
+	help
+	  This option enables the /proc/kallmodsyms file, which maps symbols
+	  to addresses and their associated modules.
+
 config PRINTK
 	default y
 	bool "Enable support for printk" if EXPERT
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index c851ca0ed357..7cab409b7d28 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -33,6 +33,7 @@
  */
 extern const unsigned long kallsyms_addresses[] __weak;
 extern const int kallsyms_offsets[] __weak;
+extern const unsigned long kallsyms_sizes[] __weak;
 extern const u8 kallsyms_names[] __weak;
 
 /*
@@ -45,8 +46,18 @@ __section(".rodata") __attribute__((weak));
 extern const unsigned long kallsyms_relative_base
 __section(".rodata") __attribute__((weak));
 
+extern const unsigned long kallsyms_num_modules
+__section(".rodata") __attribute__((weak));
+
+extern const unsigned long kallsyms_module_names_len
+__section(".rodata") __attribute__((weak));
+
 extern const char kallsyms_token_table[] __weak;
 extern const u16 kallsyms_token_index[] __weak;
+extern const unsigned long kallsyms_module_addresses[] __weak;
+extern const int kallsyms_module_offsets[] __weak;
+extern const u32 kallsyms_modules[] __weak;
+extern const char kallsyms_module_names[] __weak;
 
 extern const unsigned int kallsyms_markers[] __weak;
 
@@ -182,6 +193,25 @@ static inline bool cleanup_symbol_name(char *s)
 static inline bool cleanup_symbol_name(char *s) { return false; }
 #endif
 
+#ifdef CONFIG_KALLMODSYMS
+static unsigned long kallsyms_builtin_module_address(int idx)
+{
+	if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
+		return kallsyms_module_addresses[idx];
+
+	/* values are unsigned offsets if --absolute-percpu is not in effect */
+	if (!IS_ENABLED(CONFIG_KALLSYMS_ABSOLUTE_PERCPU))
+		return kallsyms_relative_base + (u32)kallsyms_module_offsets[idx];
+
+	/* ...otherwise, positive offsets are absolute values */
+	if (kallsyms_module_offsets[idx] >= 0)
+		return kallsyms_module_offsets[idx];
+
+	/* ...and negative offsets are relative to kallsyms_relative_base - 1 */
+	return kallsyms_relative_base - 1 - kallsyms_module_offsets[idx];
+}
+#endif
+
 /* Lookup the address for this symbol. Returns 0 if not found. */
 unsigned long kallsyms_lookup_name(const char *name)
 {
@@ -225,12 +255,24 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 }
 #endif /* CONFIG_LIVEPATCH */
 
+/*
+ * The caller passes in an address, and we return an index to the symbol --
+ * potentially also size and offset information.
+ * But an address might map to multiple symbols because:
+ *   - some symbols might have zero size
+ *   - some symbols might be aliases of one another
+ *   - some symbols might span (encompass) others
+ * The symbols should already be ordered so that, for a particular address,
+ * we first have the zero-size ones, then the biggest, then the smallest.
+ * So we find the index by:
+ *   - finding the last symbol with the target address
+ *   - backing the index up so long as both the address and size are unchanged
+ */
 static unsigned long get_symbol_pos(unsigned long addr,
 				    unsigned long *symbolsize,
 				    unsigned long *offset)
 {
-	unsigned long symbol_start = 0, symbol_end = 0;
-	unsigned long i, low, high, mid;
+	unsigned long low, high, mid;
 
 	/* This kernel should never had been booted. */
 	if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
@@ -251,40 +293,69 @@ static unsigned long get_symbol_pos(unsigned long addr,
 	}
 
 	/*
-	 * Search for the first aliased symbol. Aliased
-	 * symbols are symbols with the same address.
+	 * Search for the first aliased symbol.
 	 */
-	while (low && kallsyms_sym_address(low-1) == kallsyms_sym_address(low))
+	while (low
+	    && kallsyms_sym_address(low-1) == kallsyms_sym_address(low)
+	    && kallsyms_sizes[low-1] == kallsyms_sizes[low])
 		--low;
 
-	symbol_start = kallsyms_sym_address(low);
-
-	/* Search for next non-aliased symbol. */
-	for (i = low + 1; i < kallsyms_num_syms; i++) {
-		if (kallsyms_sym_address(i) > symbol_start) {
-			symbol_end = kallsyms_sym_address(i);
-			break;
-		}
-	}
-
-	/* If we found no next symbol, we use the end of the section. */
-	if (!symbol_end) {
-		if (is_kernel_inittext(addr))
-			symbol_end = (unsigned long)_einittext;
-		else if (IS_ENABLED(CONFIG_KALLSYMS_ALL))
-			symbol_end = (unsigned long)_end;
-		else
-			symbol_end = (unsigned long)_etext;
-	}
-
 	if (symbolsize)
-		*symbolsize = symbol_end - symbol_start;
+		*symbolsize = kallsyms_sizes[low];
 	if (offset)
-		*offset = addr - symbol_start;
+		*offset = addr - kallsyms_sym_address(low);
 
 	return low;
 }
 
+/*
+ * The caller passes in an address, and we return an index to the corresponding
+ * builtin module index in .kallsyms_modules, or (unsigned long) -1 if none
+ * match.
+ *
+ * The hint_idx, if set, is a hint as to the possible return value, to handle
+ * the common case in which consecutive runs of addresses relate to the same
+ * index.
+ */
+#ifdef CONFIG_KALLMODSYMS
+static unsigned long get_builtin_module_idx(unsigned long addr, unsigned long hint_idx)
+{
+	unsigned long low, high, mid;
+
+	if (!IS_ENABLED(CONFIG_KALLSYMS_BASE_RELATIVE))
+		BUG_ON(!kallsyms_module_addresses);
+	else
+		BUG_ON(!kallsyms_module_offsets);
+
+	/*
+	 * Do a binary search on the sorted kallsyms_modules array.  The last
+	 * entry in this array indicates the end of the text section, not an
+	 * object file.
+	 */
+	low = 0;
+	high = kallsyms_num_modules - 1;
+
+	if (hint_idx > low && hint_idx < (high - 1) &&
+	    addr >= kallsyms_builtin_module_address(hint_idx) &&
+	    addr < kallsyms_builtin_module_address(hint_idx + 1))
+		return hint_idx;
+
+	if (addr >= kallsyms_builtin_module_address(low)
+	    && addr < kallsyms_builtin_module_address(high)) {
+		while (high - low > 1) {
+			mid = low + (high - low) / 2;
+			if (kallsyms_builtin_module_address(mid) <= addr)
+				low = mid;
+			else
+				high = mid;
+		}
+		return low;
+	}
+
+	return (unsigned long) -1;
+}
+#endif
+
 /*
  * Lookup an address but don't bother to find any names.
  */
@@ -300,6 +371,7 @@ int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize,
 	return !!module_address_lookup(addr, symbolsize, offset, NULL, namebuf) ||
 	       !!__bpf_address_lookup(addr, symbolsize, offset, namebuf);
 }
+EXPORT_SYMBOL_GPL(kallsyms_lookup_size_offset);
 
 /*
  * Lookup an address
@@ -492,9 +564,12 @@ struct kallsym_iter {
 	loff_t pos_bpf_end;
 	unsigned long value;
 	unsigned int nameoff; /* If iterating in core kernel symbols. */
+	unsigned long size;
 	char type;
 	char name[KSYM_NAME_LEN];
 	char module_name[MODULE_NAME_LEN];
+	const char *builtin_module_names;
+	unsigned long hint_builtin_module_idx;
 	int exported;
 	int show_value;
 };
@@ -524,7 +599,9 @@ static int get_ksymbol_mod(struct kallsym_iter *iter)
 	int ret = module_get_kallsym(iter->pos - iter->pos_arch_end,
 				     &iter->value, &iter->type,
 				     iter->name, iter->module_name,
-				     &iter->exported);
+				     &iter->size, &iter->exported);
+	iter->builtin_module_names = NULL;
+
 	if (ret < 0) {
 		iter->pos_mod_end = iter->pos;
 		return 0;
@@ -544,6 +621,8 @@ static int get_ksymbol_ftrace_mod(struct kallsym_iter *iter)
 					 &iter->value, &iter->type,
 					 iter->name, iter->module_name,
 					 &iter->exported);
+	iter->builtin_module_names = NULL;
+
 	if (ret < 0) {
 		iter->pos_ftrace_mod_end = iter->pos;
 		return 0;
@@ -558,6 +637,7 @@ static int get_ksymbol_bpf(struct kallsym_iter *iter)
 
 	strlcpy(iter->module_name, "bpf", MODULE_NAME_LEN);
 	iter->exported = 0;
+	iter->builtin_module_names = NULL;
 	ret = bpf_get_kallsym(iter->pos - iter->pos_ftrace_mod_end,
 			      &iter->value, &iter->type,
 			      iter->name);
@@ -578,23 +658,53 @@ static int get_ksymbol_kprobe(struct kallsym_iter *iter)
 {
 	strlcpy(iter->module_name, "__builtin__kprobes", MODULE_NAME_LEN);
 	iter->exported = 0;
+	iter->builtin_module_names = NULL;
 	return kprobe_get_kallsym(iter->pos - iter->pos_bpf_end,
 				  &iter->value, &iter->type,
 				  iter->name) < 0 ? 0 : 1;
 }
 
 /* Returns space to next name. */
-static unsigned long get_ksymbol_core(struct kallsym_iter *iter)
+static unsigned long get_ksymbol_core(struct kallsym_iter *iter, int kallmodsyms)
 {
 	unsigned off = iter->nameoff;
+	unsigned long mod_idx;
 
-	iter->module_name[0] = '\0';
+	iter->exported = 0;
 	iter->value = kallsyms_sym_address(iter->pos);
 
+	iter->size = kallsyms_sizes[iter->pos];
 	iter->type = kallsyms_get_symbol_type(off);
 
+	iter->module_name[0] = '\0';
+	iter->builtin_module_names = NULL;
+
 	off = kallsyms_expand_symbol(off, iter->name, ARRAY_SIZE(iter->name));
+#ifdef CONFIG_KALLMODSYMS
+	if (kallmodsyms) {
+		if (kallsyms_module_offsets)
+			mod_idx =
+			  get_builtin_module_idx(iter->value,
+						 iter->hint_builtin_module_idx);
 
+		/*
+		 * This is a built-in module iff the tables of built-in modules
+		 * (address->module name mappings) and module names are known,
+		 * and if the address was found there, and if the corresponding
+		 * module index is nonzero.  All other cases mean off the end of
+		 * the binary or in a non-modular range in between one or more
+		 * modules.  (Also guard against a corrupt kallsyms_objfiles
+		 * array pointing off the end of kallsyms_modules.)
+		 */
+		if (kallsyms_modules != NULL && kallsyms_module_names != NULL &&
+		    mod_idx != (unsigned long) -1 &&
+		    kallsyms_modules[mod_idx] != 0 &&
+		    kallsyms_modules[mod_idx] < kallsyms_module_names_len)
+			iter->builtin_module_names =
+			  &kallsyms_module_names[kallsyms_modules[mod_idx]];
+		iter->hint_builtin_module_idx = mod_idx;
+	}
+#endif
 	return off - iter->nameoff;
 }
 
@@ -640,7 +750,7 @@ static int update_iter_mod(struct kallsym_iter *iter, loff_t pos)
 }
 
 /* Returns false if pos at or past end of file. */
-static int update_iter(struct kallsym_iter *iter, loff_t pos)
+int update_iter(struct kallsym_iter *iter, loff_t pos, int kallmodsyms)
 {
 	/* Module symbols can be accessed randomly. */
 	if (pos >= kallsyms_num_syms)
@@ -650,7 +760,7 @@ static int update_iter(struct kallsym_iter *iter, loff_t pos)
 	if (pos != iter->pos)
 		reset_iter(iter, pos);
 
-	iter->nameoff += get_ksymbol_core(iter);
+	iter->nameoff += get_ksymbol_core(iter, kallmodsyms);
 	iter->pos++;
 
 	return 1;
@@ -660,14 +770,14 @@ static void *s_next(struct seq_file *m, void *p, loff_t *pos)
 {
 	(*pos)++;
 
-	if (!update_iter(m->private, *pos))
+	if (!update_iter(m->private, *pos, 0))
 		return NULL;
 	return p;
 }
 
 static void *s_start(struct seq_file *m, loff_t *pos)
 {
-	if (!update_iter(m->private, *pos))
+	if (!update_iter(m->private, *pos, 0))
 		return NULL;
 	return m->private;
 }
@@ -676,34 +786,86 @@ static void s_stop(struct seq_file *m, void *p)
 {
 }
 
-static int s_show(struct seq_file *m, void *p)
+static int s_show_internal(struct seq_file *m, void *p, int kallmodsyms)
 {
 	void *value;
 	struct kallsym_iter *iter = m->private;
+	unsigned long size;
 
 	/* Some debugging symbols have no name.  Ignore them. */
 	if (!iter->name[0])
 		return 0;
 
 	value = iter->show_value ? (void *)iter->value : NULL;
+	size = iter->show_value ? iter->size : 0;
 
-	if (iter->module_name[0]) {
+	/*
+	 * Real module, or built-in module and /proc/kallsyms being shown.
+	 */
+	if (iter->module_name[0] != '\0' ||
+	    (iter->builtin_module_names != NULL && kallmodsyms != 0)) {
 		char type;
 
 		/*
-		 * Label it "global" if it is exported,
-		 * "local" if not exported.
+		 * Label it "global" if it is exported, "local" if not exported.
 		 */
 		type = iter->exported ? toupper(iter->type) :
 					tolower(iter->type);
-		seq_printf(m, "%px %c %s\t[%s]\n", value,
-			   type, iter->name, iter->module_name);
-	} else
+#ifdef CONFIG_KALLMODSYMS
+		if (kallmodsyms) {
+			/*
+			 * /proc/kallmodsyms, built as a module.
+			 */
+			if (iter->builtin_module_names == NULL)
+				seq_printf(m, "%px %lx %c %s\t[%s]\n", value,
+					   size, type, iter->name,
+					   iter->module_name);
+			/*
+			 * /proc/kallmodsyms, single-module symbol.
+			 */
+			else if (*iter->builtin_module_names != '\0')
+				seq_printf(m, "%px %lx %c %s\t[%s]\n", value,
+					   size, type, iter->name,
+					   iter->builtin_module_names);
+			/*
+			 * /proc/kallmodsyms, multimodule symbol.  Formatted
+			 * as \0MODULE_COUNTmodule-1\0module-2\0, where
+			 * MODULE_COUNT is a single byte, 2 or higher.
+			 */
+			else {
+				size_t i = *(char *)(iter->builtin_module_names + 1);
+				const char *walk = iter->builtin_module_names + 2;
+
+				seq_printf(m, "%px %lx %c %s\t[%s]", value,
+					   size, type, iter->name, walk);
+
+                                while (--i > 0) {
+					walk += strlen(walk) + 1;
+					seq_printf (m, " [%s]", walk);
+				}
+				seq_printf(m, "\n");
+			}
+		} else				/* !kallmodsyms */
+#endif /* CONFIG_KALLMODSYMS */
+			seq_printf(m, "%px %c %s\t[%s]\n", value,
+				   type, iter->name, iter->module_name);
+	/*
+	 * Non-modular, /proc/kallmodsyms -> print size.
+	 */
+	} else if (kallmodsyms)
+		seq_printf(m, "%px %lx %c %s\n", value, size,
+			   iter->type, iter->name);
+	else
 		seq_printf(m, "%px %c %s\n", value,
 			   iter->type, iter->name);
 	return 0;
 }
 
+static int s_show(struct seq_file *m, void *p)
+{
+	return s_show_internal(m, p, 0);
+}
+
 static const struct seq_operations kallsyms_op = {
 	.start = s_start,
 	.next = s_next,
@@ -711,6 +873,35 @@ static const struct seq_operations kallsyms_op = {
 	.show = s_show
 };
 
+#ifdef CONFIG_KALLMODSYMS
+static int s_mod_show(struct seq_file *m, void *p)
+{
+	return s_show_internal(m, p, 1);
+}
+static void *s_mod_next(struct seq_file *m, void *p, loff_t *pos)
+{
+	(*pos)++;
+
+	if (!update_iter(m->private, *pos, 1))
+		return NULL;
+	return p;
+}
+
+static void *s_mod_start(struct seq_file *m, loff_t *pos)
+{
+	if (!update_iter(m->private, *pos, 1))
+		return NULL;
+	return m->private;
+}
+
+static const struct seq_operations kallmodsyms_op = {
+	.start = s_mod_start,
+	.next = s_mod_next,
+	.stop = s_stop,
+	.show = s_mod_show
+};
+#endif
+
 static inline int kallsyms_for_perf(void)
 {
 #ifdef CONFIG_PERF_EVENTS
@@ -746,7 +937,8 @@ bool kallsyms_show_value(const struct cred *cred)
 	}
 }
 
-static int kallsyms_open(struct inode *inode, struct file *file)
+static int kallsyms_open_internal(struct inode *inode, struct file *file,
+	const struct seq_operations *ops)
 {
 	/*
 	 * We keep iterator in m->private, since normal case is to
@@ -754,7 +946,7 @@ static int kallsyms_open(struct inode *inode, struct file *file)
 	 * using get_symbol_offset for every symbol.
 	 */
 	struct kallsym_iter *iter;
-	iter = __seq_open_private(file, &kallsyms_op, sizeof(*iter));
+	iter = __seq_open_private(file, ops, sizeof(*iter));
 	if (!iter)
 		return -ENOMEM;
 	reset_iter(iter, 0);
@@ -767,6 +959,18 @@ static int kallsyms_open(struct inode *inode, struct file *file)
 	return 0;
 }
 
+static int kallsyms_open(struct inode *inode, struct file *file)
+{
+	return kallsyms_open_internal(inode, file, &kallsyms_op);
+}
+
+#ifdef CONFIG_KALLMODSYMS
+static int kallmodsyms_open(struct inode *inode, struct file *file)
+{
+	return kallsyms_open_internal(inode, file, &kallmodsyms_op);
+}
+#endif
+
 #ifdef	CONFIG_KGDB_KDB
 const char *kdb_walk_kallsyms(loff_t *pos)
 {
@@ -777,7 +981,7 @@ const char *kdb_walk_kallsyms(loff_t *pos)
 		reset_iter(&kdb_walk_kallsyms_iter, 0);
 	}
 	while (1) {
-		if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
+		if (!update_iter(&kdb_walk_kallsyms_iter, *pos, 0))
 			return NULL;
 		++*pos;
 		/* Some debugging symbols have no name.  Ignore them. */
@@ -794,9 +998,21 @@ static const struct proc_ops kallsyms_proc_ops = {
 	.proc_release	= seq_release_private,
 };
 
+#ifdef CONFIG_KALLMODSYMS
+static const struct proc_ops kallmodsyms_proc_ops = {
+	.proc_open	= kallmodsyms_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_release	= seq_release_private,
+};
+#endif
+
 static int __init kallsyms_init(void)
 {
 	proc_create("kallsyms", 0444, NULL, &kallsyms_proc_ops);
+#ifdef CONFIG_KALLMODSYMS
+	proc_create("kallmodsyms", 0444, NULL, &kallmodsyms_proc_ops);
+#endif
 	return 0;
 }
 device_initcall(kallsyms_init);
diff --git a/kernel/module.c b/kernel/module.c
index 927d46cb8eb9..0229d91241d1 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4332,7 +4332,8 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
 }
 
 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
-			char *name, char *module_name, int *exported)
+		       char *name, char *module_name, unsigned long *size,
+		       int *exported)
 {
 	struct module *mod;
 
@@ -4351,6 +4352,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 			strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN);
 			strlcpy(module_name, mod->name, MODULE_NAME_LEN);
 			*exported = is_exported(name, *value, mod);
+			*size = kallsyms->symtab[symnum].st_size;
 			preempt_enable();
 			return 0;
 		}
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 82dd1b65b7a8..b8cc96cd8a9d 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -73,6 +73,12 @@ endef
 # $(Q)$(MAKE) $(build)=dir
 build := -f $(srctree)/scripts/Makefile.build obj
 
+###
+# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
+# Usage:
+# $(Q)$(MAKE) $(modbuiltin)=dir
+modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
+
 ###
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
 # Usage:
diff --git a/scripts/Makefile b/scripts/Makefile
index 9adb6d247818..d677995d3f31 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -32,6 +32,12 @@ HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
 HOSTLDLIBS_sorttable = -lpthread
 endif
 
+kallsyms-objs  := kallsyms.o
+
+ifdef CONFIG_KALLMODSYMS
+kallsyms-objs += modules_thick.o
+endif
+
 # The following programs are only built on demand
 hostprogs += unifdef
 
diff --git a/scripts/Makefile.modbuiltin b/scripts/Makefile.modbuiltin
new file mode 100644
index 000000000000..a27b692ea795
--- /dev/null
+++ b/scripts/Makefile.modbuiltin
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: GPL-2.0
+# ==========================================================================
+# Generating modules_thick.builtin
+# ==========================================================================
+
+src := $(obj)
+
+PHONY := __modbuiltin
+__modbuiltin:
+
+include include/config/auto.conf
+# tristate.conf sets tristate variables to uppercase 'Y' or 'M'
+# That way, we get the list of built-in modules in obj-Y
+include include/config/tristate.conf
+
+include scripts/Kbuild.include
+
+ifdef building_out_of_srctree
+# Create output directory if not already present
+_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
+endif
+
+# The filename Kbuild has precedence over Makefile
+kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
+kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
+include $(kbuild-file)
+
+include scripts/Makefile.lib
+
+modthickbuiltin-subdirs := $(patsubst %,%/modules_thick.builtin, $(subdir-ym))
+modthickbuiltin-target  := $(obj)/modules_thick.builtin
+
+__modbuiltin: $(obj)/$(builtin-file) $(subdir-ym)
+	@:
+
+$(modthickbuiltin-target): $(subdir-ym) FORCE
+	$(Q) rm -f $@
+	$(Q) $(foreach mod-o, $(filter %.o,$(obj-Y)),\
+		printf "%s:" $(addprefix $(obj)/,$(mod-o)) >> $@; \
+		printf " %s" $(sort $(strip $(addprefix $(obj)/,$($(mod-o:.o=-objs)) \
+			$($(mod-o:.o=-y)) $($(mod-o:.o=-Y))))) >> $@; \
+		printf "\n" >> $@; ) \
+	cat /dev/null $(modthickbuiltin-subdirs) >> $@;
+
+PHONY += FORCE
+
+FORCE:
+
+# Descending
+# ---------------------------------------------------------------------------
+
+PHONY += $(subdir-ym)
+$(subdir-ym):
+	$(Q)$(MAKE) $(modbuiltin)=$@ builtin-file=$(builtin-file)
+
+.PHONY: $(PHONY)
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 54ad86d13784..c134a05042cf 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -5,7 +5,10 @@
  * This software may be used and distributed according to the terms
  * of the GNU General Public License, incorporated herein by reference.
  *
- * Usage: nm -n vmlinux | scripts/kallsyms [--all-symbols] > symbols.S
+ * Usage: nm -n -S vmlinux
+ *        | scripts/kallsyms [--all-symbols] [--absolute-percpu]
+ *             [--base-relative] [--builtin=modules_thick.builtin]
+ *        > symbols.S
  *
  *      Table compression uses all the unused char codes on the symbols and
  *  maps these to the most used substrings (tokens). For instance, it might
@@ -18,19 +21,31 @@
  *
  */
 
+#define _GNU_SOURCE 1
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <limits.h>
+#include <assert.h>
+#include "modules_thick.h"
 
+#include "../include/generated/autoconf.h"
+
+#ifdef CONFIG_KALLMODSYMS
+#include <errno.h>
+#endif
+
+#ifndef ARRAY_SIZE
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
+#endif
 
 #define KSYM_NAME_LEN		128
 
 struct sym_entry {
 	unsigned long long addr;
+	unsigned long long size;
 	unsigned int len;
 	unsigned int start_pos;
 	unsigned int percpu_absolute;
@@ -67,11 +82,304 @@ static int token_profit[0x10000];
 static unsigned char best_table[256][2];
 static unsigned char best_table_len[256];
 
+#ifdef CONFIG_KALLMODSYMS
+static unsigned int strhash(const char *s)
+{
+	/* fnv32 hash */
+	unsigned int hash = 2166136261U;
+
+	for (; *s; s++)
+		hash = (hash ^ *s) * 0x01000193;
+	return hash;
+}
+
+static unsigned int memhash(char *s, size_t len)
+{
+	/* fnv32 hash */
+	unsigned int hash = 2166136261U;
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		hash = (hash ^ *(s + i)) * 0x01000193;
+	return hash;
+}
+
+#define OBJ2MOD_BITS 10
+#define OBJ2MOD_N (1 << OBJ2MOD_BITS)
+#define OBJ2MOD_MASK (OBJ2MOD_N - 1)
+struct obj2mod_elem {
+	char *obj;
+	char *mods;			/* sorted module name strtab */
+	size_t nmods;			/* number of modules in "mods" */
+	size_t mods_size;		/* size of all mods together */
+	int mod_offset;			/* offset in .kallsyms_module_names */
+	/*
+	 * If set at emission time, this points at another obj2mod entry that
+	 * contains the module name we need (possibly at a slightly later
+	 * offset, if the entry is for an objfile that appears in many modules).
+	 */
+	struct obj2mod_elem *xref;
+	struct obj2mod_elem *obj2mod_next;
+	struct obj2mod_elem *mod2obj_next;
+};
+
+/*
+ * Map from object files to obj2mod entries (a unique mapping), and vice versa
+ * (not unique, but entries for objfiles in more than one module in this hash
+ * are ignored).
+ */
+
+static struct obj2mod_elem *obj2mod[OBJ2MOD_N];
+static struct obj2mod_elem *mod2obj[OBJ2MOD_N];
+static size_t num_objfiles;
+
+/*
+ * An ordered list of address ranges and the objfile that occupies that range.
+ */
+struct addrmap_entry {
+	unsigned long long addr;
+	struct obj2mod_elem *objfile;
+};
+static struct addrmap_entry *addrmap;
+static int addrmap_num, addrmap_alloced;
+
+static void obj2mod_init(void)
+{
+	memset(obj2mod, 0, sizeof(obj2mod));
+}
+
+static struct obj2mod_elem *obj2mod_get(const char *obj)
+{
+	int i = strhash(obj) & OBJ2MOD_MASK;
+	struct obj2mod_elem *elem;
+
+	for (elem = obj2mod[i]; elem; elem = elem->obj2mod_next) {
+		if (strcmp(elem->obj, obj) == 0)
+			return elem;
+	}
+	return NULL;
+}
+
+/*
+ * Note that a given object file is found in some module, interning it in the
+ * obj2mod hash.  Should not be called more than once for any given (module,
+ * object) pair.
+ */
+static void obj2mod_add(char *obj, char *mod)
+{
+	int i = strhash(obj) & OBJ2MOD_MASK;
+	struct obj2mod_elem *elem;
+
+	elem = obj2mod_get(obj);
+	if (!elem) {
+		int j = strhash(mod) & OBJ2MOD_MASK;
+
+		elem = malloc(sizeof(struct obj2mod_elem));
+		if (!elem)
+			goto oom;
+		memset(elem, 0, sizeof(struct obj2mod_elem));
+		elem->obj = strdup(obj);
+		if (!elem->obj)
+			goto oom;
+		elem->mods = strdup(mod);
+		if (!elem->mods)
+			goto oom;
+
+		elem->obj2mod_next = obj2mod[i];
+		obj2mod[i] = elem;
+		elem->mod2obj_next = mod2obj[j];
+		mod2obj[j] = elem;
+		num_objfiles++;
+	} else {
+		/*
+		 * TU appears in multiple modules.  mod2obj for this entry will
+		 * be ignored from now on, except insofar as it is needed to
+		 * maintain the hash chain.
+		 */
+		elem->mods = realloc(elem->mods, elem->mods_size +
+				     strlen(mod) + 1);
+		if (!elem->mods)
+			goto oom;
+		strcpy(elem->mods + elem->mods_size, mod);
+	}
+
+	elem->mods_size += strlen(mod) + 1;
+	elem->nmods++;
+	if (elem->nmods > 255) {
+		fprintf(stderr, "kallsyms: %s: too many modules associated with this object file\n",
+			obj);
+		exit(EXIT_FAILURE);
+	}
+	return;
+oom:
+	fprintf(stderr, "kallsyms: out of memory\n");
+	exit(1);
+}
+
+/*
+ * Used inside optimize_obj2mod to identify duplicate module entries.
+ */
+struct obj2mod_modhash_elem {
+	struct obj2mod_elem *elem;
+	unsigned int modhash;		/* hash value of this entry */
+};
+
+static int qstrcmp(const void *a, const void *b)
+{
+	return strcmp((const char *) a, (const char *) b);
+}
+
+static int qmodhash(const void *a, const void *b)
+{
+	const struct obj2mod_modhash_elem *el_a = a;
+	const struct obj2mod_modhash_elem *el_b = b;
+	if (el_a->modhash < el_b->modhash)
+		return -1;
+	else if (el_a->modhash > el_b->modhash)
+		return 1;
+	return 0;
+}
+
+/*
+ * Associate all TUs in obj2mod which refer to the same module with a single
+ * obj2mod entry for emission, preferring to point into the module list in a
+ * multi-module objfile.
+ */
+static void optimize_obj2mod(void)
+{
+	size_t i;
+	size_t n = 0;
+	struct obj2mod_elem *elem;
+	struct obj2mod_elem *dedup;
+	/* An array of all obj2mod_elems, later sorted by hashval.  */
+	struct obj2mod_modhash_elem *uniq;
+	struct obj2mod_modhash_elem *last;
+
+	/*
+	 * Canonicalize all module lists by sorting them, then compute their
+	 * hash values.
+	 */
+	uniq = malloc(sizeof(struct obj2mod_modhash_elem) * num_objfiles);
+	if (uniq == NULL)
+		goto oom;
+
+	for (i = 0; i < OBJ2MOD_N; i++) {
+		for (elem = obj2mod[i]; elem; elem = elem->obj2mod_next) {
+			if (elem->nmods >= 2) {
+				char **sorter;
+				char *walk;
+				char *tmp_mods;
+				size_t j;
+
+				tmp_mods = malloc(elem->mods_size);
+				sorter = malloc(sizeof(char *) * elem->nmods);
+				if (sorter == NULL || tmp_mods == NULL)
+					goto oom;
+				memcpy(tmp_mods, elem->mods, elem->mods_size);
+
+				for (j = 0, walk = tmp_mods; j < elem->nmods;
+				     j++) {
+					sorter[j] = walk;
+					walk += strlen(walk) + 1;
+				}
+				qsort(sorter, elem->nmods, sizeof (char *),
+				      qstrcmp);
+				for (j = 0, walk = elem->mods; j < elem->nmods;
+				     j++) {
+					strcpy(walk, sorter[j]);
+					walk += strlen(walk) + 1;
+				}
+				free(tmp_mods);
+				free(sorter);
+			}
+
+			uniq[n].elem = elem;
+			uniq[n].modhash = memhash(elem->mods, elem->mods_size);
+			n++;
+		}
+	}
+
+	qsort (uniq, num_objfiles, sizeof (struct obj2mod_modhash_elem),
+	       qmodhash);
+
+	/*
+	 * Work over multimodule entries.  These must be emitted into
+	 * .kallsyms_module_names as a unit, but we can still optimize by
+	 * reusing some other identical entry.  Single-file modules are amenable
+	 * to the same optimization, but we avoid doing it for now so that we
+	 * can prefer to point them directly inside a multimodule entry.
+	 */
+	for (i = 0, last = NULL; i < num_objfiles; i++) {
+		const char *onemod;
+		size_t j;
+
+		if (uniq[i].elem->nmods < 2)
+			continue;
+
+		/* Duplicate multimodule.  Reuse the first we saw.  */
+		if (last != NULL && last->modhash == uniq[i].modhash) {
+			uniq[i].elem->xref = last->elem;
+			continue;
+		}
+
+		/*
+		 * Single-module entries relating to modules also emitted as
+		 * part of this multimodule entry can refer to it: later, we
+		 * will hunt down the right specific module name within this
+		 * multimodule entry and point directly to it.
+		 */
+		onemod = uniq[i].elem->mods;
+		for (j = uniq[i].elem->nmods; j > 0; j--) {
+			int h = strhash(onemod) & OBJ2MOD_MASK;
+
+			for (dedup = mod2obj[h]; dedup;
+			     dedup = dedup->mod2obj_next) {
+				if (dedup->nmods > 1)
+					continue;
+
+				if (strcmp(dedup->mods, onemod) != 0)
+					continue;
+				dedup->xref = uniq[i].elem;
+				assert (uniq[i].elem->xref == NULL);
+			}
+			onemod += strlen(onemod) + 1;
+		}
+
+		last = &uniq[i];
+	}
+
+	/*
+	 * Now traverse all single-module entries, xreffing every one that
+	 * relates to a given module to the first one we saw that refers to that
+	 * module.
+	 */
+	for (i = 0, last = NULL; i < num_objfiles; i++) {
+		if (uniq[i].elem->nmods > 1)
+			continue;
+
+		if (uniq[i].elem->xref != NULL)
+			continue;
+
+		/* Duplicate module name.  Reuse the first we saw.  */
+		if (last != NULL && last->modhash == uniq[i].modhash) {
+			uniq[i].elem->xref = last->elem;
+			assert (last->elem->xref == NULL);
+			continue;
+		}
+		last = &uniq[i];
+	}
+	return;
+oom:
+	fprintf(stderr, "kallsyms: out of memory optimizing module list\n");
+	exit(EXIT_FAILURE);
+}
+#endif
 
 static void usage(void)
 {
-	fprintf(stderr, "Usage: kallsyms [--all-symbols] "
-			"[--base-relative] < in.map > out.S\n");
+	fprintf(stderr, "Usage: kallsyms [--all-symbols] [--absolute-percpu] "
+			"[--base-relative] [--builtin=modules_thick.builtin] "
+			"< nm_vmlinux.out > symbols.S\n");
 	exit(1);
 }
 
@@ -94,11 +402,18 @@ static bool is_ignored_symbol(const char *name, char type)
 		"kallsyms_addresses",
 		"kallsyms_offsets",
 		"kallsyms_relative_base",
+		"kallsyms_sizes",
 		"kallsyms_num_syms",
+		"kallsyms_num_modules",
 		"kallsyms_names",
 		"kallsyms_markers",
 		"kallsyms_token_table",
 		"kallsyms_token_index",
+		"kallsyms_module_offsets",
+		"kallsyms_module_addresses",
+		"kallsyms_modules",
+		"kallsyms_module_names",
+		"kallsyms_module_names_len",
 		/* Exclude linker generated symbols which vary between passes */
 		"_SDA_BASE_",		/* ppc */
 		"_SDA2_BASE_",		/* ppc */
@@ -201,10 +516,11 @@ static struct sym_entry *read_symbol(FILE *in)
 	unsigned long long addr;
 	unsigned int len;
 	struct sym_entry *sym;
-	int rc;
+	int rc = 0;
+	unsigned long long size;
 
-	rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
-	if (rc != 3) {
+	rc = fscanf(in, "%llx %llx %c %499s\n", &addr, &size, &type, name);
+	if (rc != 4) {
 		if (rc != EOF && fgets(name, 500, in) == NULL)
 			fprintf(stderr, "Read error or end of file.\n");
 		return NULL;
@@ -242,12 +558,13 @@ static struct sym_entry *read_symbol(FILE *in)
 	sym->sym[0] = type;
 	strcpy(sym_name(sym), name);
 	sym->percpu_absolute = 0;
+	sym->size = size;
 
 	return sym;
 }
 
-static int symbol_in_range(const struct sym_entry *s,
-			   const struct addr_range *ranges, int entries)
+static int addr_in_range(unsigned long long addr,
+			 const struct addr_range *ranges, int entries)
 {
 	size_t i;
 	const struct addr_range *ar;
@@ -255,7 +572,7 @@ static int symbol_in_range(const struct sym_entry *s,
 	for (i = 0; i < entries; ++i) {
 		ar = &ranges[i];
 
-		if (s->addr >= ar->start && s->addr <= ar->end)
+		if (addr >= ar->start && addr <= ar->end)
 			return 1;
 	}
 
@@ -269,8 +586,8 @@ static int symbol_valid(const struct sym_entry *s)
 	/* if --all-symbols is not specified, then symbols outside the text
 	 * and inittext sections are discarded */
 	if (!all_symbols) {
-		if (symbol_in_range(s, text_ranges,
-				    ARRAY_SIZE(text_ranges)) == 0)
+		if (addr_in_range(s->addr, text_ranges,
+				  ARRAY_SIZE(text_ranges)) == 0)
 			return 0;
 		/* Corner case.  Discard any symbols with the same value as
 		 * _etext _einittext; they can move between pass 1 and 2 when
@@ -352,6 +669,181 @@ static void output_address(unsigned long long addr)
 		printf("\tPTR\t_text - %#llx\n", _text - addr);
 }
 
+#ifdef CONFIG_KALLMODSYMS
+/* Output the .kallmodsyms_modules symbol content. */
+static void output_kallmodsyms_modules(void)
+{
+	struct obj2mod_elem *elem;
+	size_t offset = 1;
+	size_t i;
+
+	/*
+	 * Traverse and emit, chasing xref and updating mod_offset accordingly.
+	 * Emit a single \0 at the start, to encode non-modular objfiles.
+	 */
+	output_label("kallsyms_module_names");
+	printf("\t.byte\t0\n");
+	for (i = 0; i < OBJ2MOD_N; i++) {
+		for (elem = obj2mod[i]; elem;
+		     elem = elem->obj2mod_next) {
+			const char *onemod;
+			size_t i;
+			struct obj2mod_elem *out_elem = elem;
+
+			if (elem->xref)
+				out_elem = elem->xref;
+			if (out_elem->mod_offset != 0)
+				continue;	/* Already emitted.  */
+
+			out_elem->mod_offset = offset;
+			onemod = out_elem->mods;
+
+			/*
+			 * Technically this is a waste of space: we could just
+			 * as well implement multimodule entries by pointing one
+			 * byte further back, to the trailing \0 of the previous
+			 * entry, but doing it this way makes it more obvious
+			 * when an entry is a multimodule entry.
+			 */
+			if (out_elem->nmods != 1) {
+				printf("\t.byte\t0\n");
+				printf("\t.byte\t%zi\n", out_elem->nmods);
+				offset += 2;
+			}
+
+			for (i = out_elem->nmods; i > 0; i--) {
+				printf("\t.asciz\t\"%s\"\n", onemod);
+				offset += strlen(onemod) + 1;
+				onemod += strlen(onemod) + 1;
+			}
+		}
+	}
+	printf("\n");
+	output_label("kallsyms_module_names_len");
+	printf("\t.long\t%zi\n", offset);
+}
+
+static void output_kallmodsyms_objfiles(void)
+{
+	size_t i = 0;
+	size_t emitted_offsets = 0;
+	size_t emitted_objfiles = 0;
+
+	if (base_relative)
+		output_label("kallsyms_module_offsets");
+	else
+		output_label("kallsyms_module_addresses");
+
+	for (i = 0; i < addrmap_num; i++) {
+		long long offset;
+		int overflow;
+
+                /*
+                 * Fuse consecutive address ranges citing the same object file
+                 * into one.
+                 */
+                if (i > 0 && addrmap[i-1].objfile == addrmap[i].objfile)
+                        continue;
+
+		if (base_relative) {
+			if (!absolute_percpu) {
+				offset = addrmap[i].addr - relative_base;
+				overflow = (offset < 0 || offset > UINT_MAX);
+			} else {
+				offset = relative_base - addrmap[i].addr - 1;
+				overflow = (offset < INT_MIN || offset >= 0);
+			}
+			if (overflow) {
+				fprintf(stderr, "kallsyms failure: "
+					"objfile %s at address %#llx out of range in relative mode\n",
+					addrmap[i].objfile ? addrmap[i].objfile->obj :
+					"in always-built-in object", table[i]->addr);
+				exit(EXIT_FAILURE);
+			}
+			printf("\t.long\t0x%x\n", (int)offset);
+		} else
+			printf("\tPTR\t%#llx\n", addrmap[i].addr);
+		emitted_offsets++;
+	}
+
+	output_label("kallsyms_modules");
+
+	for (i = 0; i < addrmap_num; i++) {
+		struct obj2mod_elem *elem = addrmap[i].objfile;
+		int orig_nmods;
+		const char *orig_modname;
+		int mod_offset;
+
+		if (i > 0 && addrmap[i-1].objfile == addrmap[i].objfile)
+			continue;
+
+		/*
+		 * Address range cites no object file: point at 0, the built-in
+		 * module.
+		 */
+		if (addrmap[i].objfile == NULL) {
+			printf("\t.long\t0x0\n");
+			emitted_objfiles++;
+			continue;
+		}
+
+		orig_nmods = elem->nmods;
+		orig_modname = elem->mods;
+
+		/*
+		 * Chase down xrefs, if need be.  There can only be one layer of
+		 * these: from single-module entry to other single-module entry,
+		 * or from single- or multi-module entry to another multi-module
+		 * entry.  Single -> single and multi -> multi always points at
+		 * the start of the xref target, so its offset can be used as is.
+		 */ 
+		if (elem->xref)
+			elem = elem->xref;
+
+		if (elem->nmods == 1 || orig_nmods > 1)
+			mod_offset = elem->mod_offset;
+		else {
+			/*
+			 * If this is a reference from a single-module entry to
+			 * a multi-module entry, hunt down the offset to this
+			 * specific module's name (which is guaranteed to be
+			 * present: see optimize_obj2mod).
+			 */
+
+			size_t j = elem->nmods;
+			const char *onemod = elem->mods;
+			mod_offset = elem->mod_offset;
+
+			for (; j > 0; j--) {
+				if (strcmp(orig_modname, onemod) == 0)
+					break;
+				onemod += strlen(onemod) + 1;
+			}
+			assert (j > 0);
+			/*
+			 * +2 to skip the null byte and count at the start of
+			 * the multimodule entry.
+			 */
+			mod_offset += onemod - elem->mods + 2;
+		}
+
+		/*
+		 * Zero offset is the initial \0, there to catch uninitialized
+		 * obj2mod entries, and is forbidden.
+		 */
+		assert (mod_offset != 0);
+
+		printf("\t.long\t0x%x\n", mod_offset);
+		emitted_objfiles++;
+	}
+
+	assert (emitted_offsets == emitted_objfiles);
+	output_label("kallsyms_num_modules");
+	printf("\t.long\t%zi\n", emitted_objfiles);
+	printf("\n");
+}
+#endif /* CONFIG_KALLMODSYMS */
+
 /* uncompress a compressed symbol. When this function is called, the best table
  * might still be compressed itself, so the function needs to be recursive */
 static int expand_symbol(const unsigned char *data, int len, char *result)
@@ -451,6 +943,16 @@ static void write_src(void)
 		printf("\n");
 	}
 
+	output_label("kallsyms_sizes");
+	for (i = 0; i < table_cnt; i++)
+		printf("\tPTR\t%#llx\n", table[i]->size);
+	printf("\n");
+
+#ifdef CONFIG_KALLMODSYMS
+	output_kallmodsyms_modules();
+	output_kallmodsyms_objfiles();
+#endif
+
 	output_label("kallsyms_num_syms");
 	printf("\t.long\t%u\n", table_cnt);
 	printf("\n");
@@ -502,7 +1004,6 @@ static void write_src(void)
 	printf("\n");
 }
 
-
 /* table lookup compression functions */
 
 /* count all the possible tokens in a symbol */
@@ -703,6 +1204,18 @@ static int compare_symbols(const void *a, const void *b)
 	if (sa->addr < sb->addr)
 		return -1;
 
+	/* zero-size markers before nonzero-size symbols */
+	if (sa->size > 0 && sb->size == 0)
+		return 1;
+	if (sa->size == 0 && sb->size > 0)
+		return -1;
+
+	/* sort by size (large size preceding symbols it encompasses) */
+	if (sa->size < sb->size)
+		return 1;
+	if (sa->size > sb->size)
+		return -1;
+
 	/* sort by "weakness" type */
 	wa = (sa->sym[0] == 'w') || (sa->sym[0] == 'W');
 	wb = (sb->sym[0] == 'w') || (sb->sym[0] == 'W');
@@ -735,7 +1248,7 @@ static void make_percpus_absolute(void)
 	unsigned int i;
 
 	for (i = 0; i < table_cnt; i++)
-		if (symbol_in_range(table[i], &percpu_range, 1)) {
+		if (addr_in_range(table[i]->addr, &percpu_range, 1)) {
 			/*
 			 * Keep the 'A' override for percpu symbols to
 			 * ensure consistent behavior compared to older
@@ -762,17 +1275,125 @@ static void record_relative_base(void)
 		}
 }
 
+#ifdef CONFIG_KALLMODSYMS
+/*
+ * Read the linker map.
+ */
+static void read_linker_map(void)
+{
+	unsigned long long addr, size;
+	char obj[PATH_MAX+1];
+	FILE *f = fopen(".tmp_vmlinux.ranges", "r");
+
+	if (!f) {
+		fprintf(stderr, "Cannot open '.tmp_vmlinux.ranges'.\n");
+		exit(1);
+	}
+
+	addrmap_num = 0;
+	addrmap_alloced = 4096;
+	addrmap = malloc(sizeof(*addrmap) * addrmap_alloced);
+	if (!addrmap)
+		goto oom;
+
+	/*
+	 * For each address range, add to addrmap the address and the objfile
+	 * entry to which the range maps.  Only add entries relating to text
+	 * ranges.  (We assume that the text ranges are tightly packed, because
+	 * in any reasonable object file format they will be, so we can ignore
+	 * the size.)
+	 *
+	 * Ranges that do not correspond to a built-in module, but to an
+	 * always-built-in object file, have no obj2mod_elem and point at NULL
+	 * instead.
+	 */
+
+	while (fscanf(f, "%llx %llx %s\n", &addr, &size, obj) == 3) {
+		struct obj2mod_elem *elem = obj2mod_get(obj);
+
+		if (addr == 0 || size == 0 ||
+		    !addr_in_range(addr, text_ranges, ARRAY_SIZE(text_ranges)))
+			continue;
+
+		if (addrmap_num >= addrmap_alloced) {
+			addrmap_alloced *= 2;
+			addrmap = realloc(addrmap,
+			    sizeof(*addrmap) * addrmap_alloced);
+			if (!addrmap)
+				goto oom;
+		}
+
+                addrmap[addrmap_num].addr = addr;
+                addrmap[addrmap_num].objfile = elem;
+		addrmap_num++;
+	}
+	fclose(f);
+	return;
+
+oom:
+	fprintf(stderr, "kallsyms: out of memory\n");
+	exit(1);
+}
+
+/*
+ * Read "modules_thick.builtin" (the list of built-in modules).  Construct the
+ * obj2mod hash to track objfile -> module mappings.  Read ".tmp_vmlinux.ranges"
+ * (the linker map) and build addrmap[], which maps address ranges to built-in
+ * module names (using obj2mod).
+ */
+static void read_modules(const char *modules_builtin)
+{
+	struct modules_thick_iter *i;
+	char *module_name = NULL;
+	char **module_paths;
+
+	obj2mod_init();
+	/*
+	 * Iterate over all modules in modules_thick.builtin and add each.
+	 */
+	i = modules_thick_iter_new(modules_builtin);
+	if (i == NULL) {
+		fprintf(stderr, "Cannot iterate over builtin modules.\n");
+		exit(1);
+	}
+
+	while ((module_paths = modules_thick_iter_next(i, &module_name))) {
+		char **walk = module_paths;
+		while (*walk) {
+			obj2mod_add(*walk, module_name);
+			walk++;
+		}
+		free(module_paths);
+	}
+
+	free(module_name);
+	modules_thick_iter_free(i);
+	optimize_obj2mod();
+
+	/*
+	 * Read linker map.
+	 */
+	read_linker_map();
+}
+#else
+static void read_modules(const char *unused) {}
+#endif /* CONFIG_KALLMODSYMS */
+
 int main(int argc, char **argv)
 {
+	const char *modules_builtin = "modules_thick.builtin";
+
 	if (argc >= 2) {
 		int i;
 		for (i = 1; i < argc; i++) {
-			if(strcmp(argv[i], "--all-symbols") == 0)
+			if (strcmp(argv[i], "--all-symbols") == 0)
 				all_symbols = 1;
 			else if (strcmp(argv[i], "--absolute-percpu") == 0)
 				absolute_percpu = 1;
 			else if (strcmp(argv[i], "--base-relative") == 0)
 				base_relative = 1;
+			else if (strncmp(argv[i], "--builtin=", 10) == 0)
+				modules_builtin = &argv[i][10];
 			else
 				usage();
 		}
@@ -780,6 +1401,7 @@ int main(int argc, char **argv)
 		usage();
 
 	read_map(stdin);
+	read_modules(modules_builtin);
 	shrink_table();
 	if (absolute_percpu)
 		make_percpus_absolute();
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index cf72680cd769..67361b09fcaa 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -725,6 +725,25 @@ static struct conf_printer header_printer_cb =
 	.print_comment = header_print_comment,
 };
 
+/*
+ * Tristate printer
+ *
+ * This printer is used when generating the `include/config/tristate.conf' file.
+ */
+static void
+tristate_print_symbol(FILE *fp, struct symbol *sym, const char *value, void *arg)
+{
+
+       if (sym->type == S_TRISTATE && *value != 'n')
+	       fprintf(fp, "%s%s=%c\n", CONFIG_, sym->name, (char)toupper(*value));
+}
+
+static struct conf_printer tristate_printer_cb =
+{
+       .print_symbol = tristate_print_symbol,
+       .print_comment = kconfig_print_comment,
+};
+
 static void conf_write_symbol(FILE *fp, struct symbol *sym,
 			      struct conf_printer *printer, void *printer_arg)
 {
@@ -1058,7 +1077,7 @@ int conf_write_autoconf(int overwrite)
 	struct symbol *sym;
 	const char *name;
 	const char *autoconf_name = conf_get_autoconfig_name();
-	FILE *out, *out_h;
+	FILE *out, *tristate, *out_h;
 	int i;
 
 	if (!overwrite && is_present(autoconf_name))
@@ -1073,6 +1092,13 @@ int conf_write_autoconf(int overwrite)
 	if (!out)
 		return 1;
 
+	tristate = fopen(".tmpconfig_tristate", "w");
+	if (!tristate) {
+		fclose(out);
+		fclose(tristate);
+		return 1;
+	}
+
 	out_h = fopen(".tmpconfig.h", "w");
 	if (!out_h) {
 		fclose(out);
@@ -1080,6 +1106,7 @@ int conf_write_autoconf(int overwrite)
 	}
 
 	conf_write_heading(out, &kconfig_printer_cb, NULL);
+	conf_write_heading(tristate, &tristate_printer_cb, NULL);
 	conf_write_heading(out_h, &header_printer_cb, NULL);
 
 	for_all_symbols(i, sym) {
@@ -1087,11 +1114,13 @@ int conf_write_autoconf(int overwrite)
 		if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
 			continue;
 
-		/* write symbols to auto.conf and autoconf.h */
+		/* write symbols to auto.conf, tristate and autoconf.h */
 		conf_write_symbol(out, sym, &kconfig_printer_cb, (void *)1);
+		conf_write_symbol(tristate, sym, &tristate_printer_cb, (void *)1);
 		conf_write_symbol(out_h, sym, &header_printer_cb, NULL);
 	}
 	fclose(out);
+	fclose(tristate);
 	fclose(out_h);
 
 	name = getenv("KCONFIG_AUTOHEADER");
@@ -1102,6 +1131,14 @@ int conf_write_autoconf(int overwrite)
 	if (rename(".tmpconfig.h", name))
 		return 1;
 
+	name = getenv("KCONFIG_TRISTATE");
+	if (!name)
+		name = "include/config/tristate.conf";
+	if (make_parent_dir(name))
+		return 1;
+	if (rename(".tmpconfig_tristate", name))
+		return 1;
+	
 	if (make_parent_dir(autoconf_name))
 		return 1;
 	/*
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 0e0f6466b18d..85a2754fdb6a 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -178,6 +178,7 @@ vmlinux_link()
 			objects="--whole-archive		\
 				vmlinux.o 			\
 				--no-whole-archive		\
+				-Map=.tmp_vmlinux.map		\
 				${@}"
 		else
 			objects="--whole-archive		\
@@ -186,6 +187,7 @@ vmlinux_link()
 				--start-group			\
 				${KBUILD_VMLINUX_LIBS}		\
 				--end-group			\
+				-Map=.tmp_vmlinux.map		\
 				${@}"
 		fi
 
@@ -201,6 +203,7 @@ vmlinux_link()
 			-Wl,--start-group			\
 			${KBUILD_VMLINUX_LIBS}			\
 			-Wl,--end-group				\
+			-Wl,-Map=.tmp_vmlinux.map		\
 			${@}"
 
 		${CC} ${CFLAGS_vmlinux}				\
@@ -259,6 +262,19 @@ kallsyms()
 {
 	local kallsymopt;
 
+	# read the linker map to identify ranges of addresses:
+	#   - for each *.o file, report address, size, pathname
+	#       - most such lines will have four fields
+	#       - but sometimes there is a line break after the first field
+	#   - start reading at "Linker script and memory map"
+	#   - stop reading at ".brk"
+	${AWK} '
+	    /\.o$/ && start==1 { print $(NF-2), $(NF-1), $NF }
+	    /^Linker script and memory map/ { start = 1 }
+	    /^\.brk/ { exit(0) }
+	' .tmp_vmlinux.map | sort > .tmp_vmlinux.ranges
+
+	# get kallsyms options
 	if [ -n "${CONFIG_KALLSYMS_ALL}" ]; then
 		kallsymopt="${kallsymopt} --all-symbols"
 	fi
@@ -272,7 +288,12 @@ kallsyms()
 	fi
 
 	info KSYMS ${2}
-	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2}
+	# "nm -S" does not print symbol size when size is 0
+	# Therefore use awk to regularize the data:
+	#   - when there are only three fields, add an explicit "0"
+	#   - when there are already four fields, pass through as is
+	${NM} -n -S ${1} | ${AWK} 'NF==3 {print $1, 0, $2, $3}; NF==4' | \
+	    scripts/kallsyms ${kallsymopt} > ${2}
 }
 
 # Perform one step in kallsyms generation, including temporary linking of
diff --git a/scripts/modules_thick.c b/scripts/modules_thick.c
new file mode 100644
index 000000000000..9a15e99c1330
--- /dev/null
+++ b/scripts/modules_thick.c
@@ -0,0 +1,200 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * A simple modules_thick reader.
+ *
+ * (C) 2014, 2021 Oracle, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "modules_thick.h"
+
+/*
+ * Read a modules_thick.builtin file and translate it into a stream of
+ * name / module-name pairs.
+ */
+
+/*
+ * Construct a modules_thick.builtin iterator.
+ */
+struct modules_thick_iter *
+modules_thick_iter_new(const char *modules_thick_file)
+{
+	struct modules_thick_iter *i;
+
+	i = calloc(1, sizeof(struct modules_thick_iter));
+	if (i == NULL)
+		return NULL;
+
+	i->f = fopen(modules_thick_file, "r");
+
+	if (i->f == NULL) {
+		fprintf(stderr, "Cannot open builtin module file %s: %s\n",
+			modules_thick_file, strerror(errno));
+		return NULL;
+	}
+
+	return i;
+}
+
+/*
+ * Iterate, returning a new null-terminated array of object file names, and a
+ * new dynamically-allocated module name.  (The module name passed in is freed.)
+ *
+ * The array of object file names should be freed by the caller: the strings it
+ * points to are owned by the iterator, and should not be freed.
+ */
+
+char ** __attribute__((__nonnull__))
+modules_thick_iter_next(struct modules_thick_iter *i, char **module_name)
+{
+	size_t npaths = 1;
+	char **module_paths;
+	char *last_slash;
+	char *last_dot;
+	char *trailing_linefeed;
+	char *object_name = i->line;
+	char *dash;
+	int composite = 0;
+
+	/*
+	 * Read in all module entries, computing the suffixless, pathless name
+	 * of the module and building the next arrayful of object file names for
+	 * return.
+	 *
+	 * Modules can consist of multiple files: in this case, the portion
+	 * before the colon is the path to the module (as before): the portion
+	 * after the colon is a space-separated list of files that should be
+	 * considered part of this module.  In this case, the portion before the
+	 * name is an "object file" that does not actually exist: it is merged
+	 * into built-in.a without ever being written out.
+	 *
+	 * All module names have - translated to _, to match what is done to the
+	 * names of the same things when built as modules.
+	 */
+
+	/*
+	 * Reinvocation of exhausted iterator. Return NULL, once.
+	 */
+retry:
+	if (getline(&i->line, &i->line_size, i->f) < 0) {
+		if (ferror(i->f)) {
+			fprintf(stderr, "Error reading from modules_thick file:"
+				" %s\n", strerror(errno));
+			exit(1);
+		}
+		rewind(i->f);
+		return NULL;
+	}
+
+	if (i->line[0] == '\0')
+		goto retry;
+
+	/*
+	 * Slice the line in two at the colon, if any.  If there is anything
+	 * past the ': ', this is a composite module.  (We allow for no colon
+	 * for robustness, even though one should always be present.)
+	 */
+	if (strchr(i->line, ':') != NULL) {
+		char *name_start;
+
+		object_name = strchr(i->line, ':');
+		*object_name = '\0';
+		object_name++;
+		name_start = object_name + strspn(object_name, " \n");
+		if (*name_start != '\0') {
+			composite = 1;
+			object_name = name_start;
+		}
+	}
+
+	/*
+	 * Figure out the module name.
+	 */
+	last_slash = strrchr(i->line, '/');
+	last_slash = (!last_slash) ? i->line :
+		last_slash + 1;
+	free(*module_name);
+	*module_name = strdup(last_slash);
+	dash = *module_name;
+
+	while (dash != NULL) {
+		dash = strchr(dash, '-');
+		if (dash != NULL)
+			*dash = '_';
+	}
+
+	last_dot = strrchr(*module_name, '.');
+	if (last_dot != NULL)
+		*last_dot = '\0';
+
+	trailing_linefeed = strchr(object_name, '\n');
+	if (trailing_linefeed != NULL)
+		*trailing_linefeed = '\0';
+
+	/*
+	 * Multifile separator? Object file names explicitly stated:
+	 * slice them up and shuffle them in.
+	 *
+	 * The array size may be an overestimate if any object file
+	 * names start or end with spaces (very unlikely) but cannot be
+	 * an underestimate.  (Check for it anyway.)
+	 */
+	if (composite) {
+		char *one_object;
+
+		for (npaths = 0, one_object = object_name;
+		     one_object != NULL;
+		     npaths++, one_object = strchr(one_object + 1, ' '));
+	}
+
+	module_paths = malloc((npaths + 1) * sizeof(char *));
+	if (!module_paths) {
+		fprintf(stderr, "%s: out of memory on module %s\n", __func__,
+			*module_name);
+		exit(1);
+	}
+
+	if (composite) {
+		char *one_object;
+		size_t i = 0;
+
+		while ((one_object = strsep(&object_name, " ")) != NULL) {
+			if (i >= npaths) {
+				fprintf(stderr, "%s: num_objs overflow on module "
+					"%s: this is a bug.\n", __func__,
+					*module_name);
+				exit(1);
+			}
+
+			module_paths[i++] = one_object;
+		}
+	} else
+		module_paths[0] = i->line;	/* untransformed module name */
+
+	module_paths[npaths] = NULL;
+
+	return module_paths;
+}
+
+/*
+ * Free an iterator. Can be called while iteration is underway, so even
+ * state that is freed at the end of iteration must be freed here too.
+ */
+void
+modules_thick_iter_free(struct modules_thick_iter *i)
+{
+	if (i == NULL)
+		return;
+	fclose(i->f);
+	free(i->line);
+	free(i);
+}
diff --git a/scripts/modules_thick.h b/scripts/modules_thick.h
new file mode 100644
index 000000000000..f5edcaf9550c
--- /dev/null
+++ b/scripts/modules_thick.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * A simple modules_thick reader.
+ *
+ * (C) 2014, 2021 Oracle, Inc.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _LINUX_MODULES_THICK_H
+#define _LINUX_MODULES_THICK_H
+
+#include <stdio.h>
+#include <stddef.h>
+
+/*
+ * modules_thick.builtin iteration state.
+ */
+struct modules_thick_iter {
+	FILE *f;
+	char *line;
+	size_t line_size;
+};
+
+/*
+ * Construct a modules_thick.builtin iterator.
+ */
+struct modules_thick_iter *
+modules_thick_iter_new(const char *modules_thick_file);
+
+/*
+ * Iterate, returning a new null-terminated array of object file names, and a
+ * new dynamically-allocated module name.  (The module name passed in is freed.)
+ *
+ * The array of object file names should be freed by the caller: the strings it
+ * points to are owned by the iterator, and should not be freed.
+ */
+
+char ** __attribute__((__nonnull__))
+modules_thick_iter_next(struct modules_thick_iter *i, char **module_name);
+
+void
+modules_thick_iter_free(struct modules_thick_iter *i);
+
+#endif

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