[DTrace-devel] [PATCH] kallsyms: add names of built-in modules
eugene.loh at oracle.com
eugene.loh at oracle.com
Mon Dec 9 14:35:17 PST 2019
From: Eugene Loh <eugene.loh at oracle.com>
/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 vanish simply because a module becomes built
into the kernel.
Therefore:
- Generate a file "modules_thick.builtin" that maps from thin
archives that make up built-in modules to their constituent
object files.
- Generate a linker map ".tmp_vmlinux.map", converting it into
".tmp_vmlinux.ranges", mapping address ranges to object files.
- Read "modules_thick.builtin" and ".tmp_vmlinux.ranges" to
map symbol addresses to built-in-module names. Write those
module names (kallsyms_modules) and that per-symbol module
information (kallsyms_symbol_modules) to the *.s output file.
- Use kallsyms_modules and kallsyms_symbol_modules to add
built-in-module information to /proc/kallsyms.
Note that kernel symbols for built-in modules appear in ascending
order by address, as usual, and thus will appear interspersed with
symbols that are part of other built-in modules or of the kernel.
Also, while it is possible for an object to appear in multiple
built-in modules, making an unambiguous mapping of symbol to module
impossible in such cases, this patch addresses the typical cases.
Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
Signed-off-by: Nick Alcock <nick.alcock at oracle.com>
Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
---
.gitignore | 1 +
Documentation/dontdiff | 1 +
Makefile | 41 +++--
kernel/kallsyms.c | 12 +-
scripts/Makefile | 5 +
scripts/Makefile.modbuiltin | 20 ++-
scripts/kallsyms.c | 298 +++++++++++++++++++++++++++++++++++-
scripts/link-vmlinux.sh | 17 ++
scripts/modules_thick.c | 104 +++++++++++++
scripts/modules_thick.h | 27 ++++
scripts/namespace.pl | 5 +
11 files changed, 509 insertions(+), 22 deletions(-)
create mode 100644 scripts/modules_thick.c
create mode 100644 scripts/modules_thick.h
diff --git a/.gitignore b/.gitignore
index 72ef86a5570d..0b9c88f1d388 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,7 @@
Module.symvers
modules.builtin
modules.order
+modules_thick.builtin
#
# Top-level generic files
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 72fc2e9e2b63..9d0db2ef3a51 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -181,6 +181,7 @@ modules.builtin
modules.builtin.modinfo
modules.nsdeps
modules.order
+modules_thick.builtin
modversions.h*
nconf
nconf-cfg
diff --git a/Makefile b/Makefile
index 73e3c2802927..430d49d3a93e 100644
--- a/Makefile
+++ b/Makefile
@@ -1073,7 +1073,7 @@ 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,link-vmlinux)
targets := vmlinux
@@ -1284,17 +1284,6 @@ modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
modules.order: descend
$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
-modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
-
-modules.builtin: $(modbuiltin-dirs)
- $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
-
-PHONY += $(modbuiltin-dirs)
-# tristate.conf is not included from this Makefile. Add it as a prerequisite
-# here to make it self-healing in case somebody accidentally removes it.
-$(modbuiltin-dirs): include/config/tristate.conf
- $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
-
# Target to prepare building external modules
PHONY += modules_prepare
modules_prepare: prepare
@@ -1347,6 +1336,33 @@ modules modules_install:
endif # CONFIG_MODULES
+# modules.builtin has a 'thick' form which 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: kallsyms uses this to determine which modules any
+# given object file is part of. (We cannot eliminate the slight redundancy
+# here without double-expansion.)
+
+modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
+
+modbuiltin-thick-dirs := $(addprefix _modbuiltin_thick_, $(build-dirs))
+
+modules.builtin: $(modbuiltin-dirs)
+ $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
+
+modules_thick.builtin: $(modbuiltin-thick-dirs)
+ $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
+
+PHONY += $(modbuiltin-dirs) $(modbuiltin-thick-dirs)
+# tristate.conf is not included from this Makefile. Add it as a prerequisite
+# here to make it self-healing in case somebody accidentally removes it.
+$(modbuiltin-dirs): include/config/tristate.conf
+ $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@) \
+ builtin-file=modules.builtin
+
+$(modbuiltin-thick-dirs): include/config/tristate.conf
+ $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_thick_%,%,$@) \
+ builtin-file=modules_thick.builtin
+
###
# Cleaning is done on three levels.
# make clean Delete most generated files
@@ -1712,6 +1728,7 @@ clean: $(clean-dirs)
-o -name '*.asn1.[ch]' \
-o -name '*.symtypes' -o -name 'modules.order' \
-o -name modules.builtin -o -name '.tmp_*.o.*' \
+ -o -name modules_thick.builtin \
-o -name '*.c.[012]*.*' \
-o -name '*.ll' \
-o -name '*.gcno' \) -type f -print | xargs rm -f
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 136ce049c4ad..ce8576503e35 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -46,6 +46,8 @@ __attribute__((weak, section(".rodata")));
extern const u8 kallsyms_token_table[] __weak;
extern const u16 kallsyms_token_index[] __weak;
+extern const char kallsyms_modules[] __weak;
+extern const u32 kallsyms_symbol_modules[] __weak;
extern const unsigned int kallsyms_markers[] __weak;
@@ -508,8 +510,16 @@ static int get_ksymbol_bpf(struct kallsym_iter *iter)
static unsigned long get_ksymbol_core(struct kallsym_iter *iter)
{
unsigned off = iter->nameoff;
+ u32 mod_index = 0;
- iter->module_name[0] = '\0';
+ if (kallsyms_symbol_modules)
+ mod_index = kallsyms_symbol_modules[iter->pos];
+
+ if (mod_index == 0 || kallsyms_modules == NULL)
+ iter->module_name[0] = '\0';
+ else
+ strcpy(iter->module_name, &kallsyms_modules[mod_index]);
+ iter->exported = 0;
iter->value = kallsyms_sym_address(iter->pos);
iter->type = kallsyms_get_symbol_type(off);
diff --git a/scripts/Makefile b/scripts/Makefile
index 00c47901cb06..44641cabb261 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -26,6 +26,11 @@ HOSTLDLIBS_extract-cert = -lcrypto
always := $(hostprogs-y) $(hostprogs-m)
+kallsyms-objs := kallsyms.o
+kallsyms-objs += modules_thick.o
+
+HOSTCFLAGS_modules_thick.o := -I$(srctree)/scripts
+HOSTCFLAGS_kallsyms.o := -I$(srctree)/scripts
# The following hostprogs-y programs are only build on demand
hostprogs-y += unifdef
diff --git a/scripts/Makefile.modbuiltin b/scripts/Makefile.modbuiltin
index 7d4711b88656..06f31e58111e 100644
--- a/scripts/Makefile.modbuiltin
+++ b/scripts/Makefile.modbuiltin
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
# ==========================================================================
-# Generating modules.builtin
+# Generating modules.builtin and modules_thick.builtin
# ==========================================================================
src := $(obj)
@@ -30,19 +30,29 @@ __subdir-Y := $(patsubst %/,%,$(filter %/, $(obj-Y)))
subdir-Y += $(__subdir-Y)
subdir-ym := $(sort $(subdir-y) $(subdir-Y) $(subdir-m))
subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
-obj-Y := $(addprefix $(obj)/,$(obj-Y))
+pathobj-Y := $(addprefix $(obj)/,$(obj-Y))
modbuiltin-subdirs := $(patsubst %,%/modules.builtin, $(subdir-ym))
-modbuiltin-mods := $(filter %.ko, $(obj-Y:.o=.ko))
+modbuiltin-mods := $(filter %.ko, $(pathobj-Y:.o=.ko))
modbuiltin-target := $(obj)/modules.builtin
+modthickbuiltin-subdirs := $(patsubst %,%/modules_thick.builtin, $(subdir-ym))
+modthickbuiltin-target := $(obj)/modules_thick.builtin
-__modbuiltin: $(modbuiltin-target) $(subdir-ym)
+__modbuiltin: $(obj)/$(builtin-file) $(subdir-ym)
@:
$(modbuiltin-target): $(subdir-ym) FORCE
$(Q)(for m in $(modbuiltin-mods); do echo $$m; done; \
cat /dev/null $(modbuiltin-subdirs)) > $@
+$(modthickbuiltin-target): $(subdir-ym) FORCE
+ $(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:
@@ -52,6 +62,6 @@ FORCE:
PHONY += $(subdir-ym)
$(subdir-ym):
- $(Q)$(MAKE) $(modbuiltin)=$@
+ $(Q)$(MAKE) $(modbuiltin)=$@ builtin-file=$(builtin-file)
.PHONY: $(PHONY)
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index fb55f262f42d..7368996e5d7b 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -5,7 +5,8 @@
* 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 vmlinux | scripts/kallsyms [--all-symbols]
+ * [--absolute-percpu] [--base-relative] > 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
@@ -18,12 +19,15 @@
*
*/
+#define _GNU_SOURCE 1
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
+#include <errno.h>
+#include "modules_thick.h"
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
@@ -35,6 +39,7 @@ struct sym_entry {
unsigned int start_pos;
unsigned char *sym;
unsigned int percpu_absolute;
+ unsigned int module;
};
struct addr_range {
@@ -68,10 +73,101 @@ static unsigned char best_table[256][2];
static unsigned char best_table_len[256];
+static unsigned int strhash(const char *s)
+{
+ /* fnv32 hash */
+ unsigned int hash = 2166136261U;
+
+ for (; *s; s++)
+ hash = (hash ^ *s) * 0x01000193;
+ return hash;
+}
+
+#define OBJ2MOD_BITS 10
+#define OBJ2MOD_N (1 << OBJ2MOD_BITS)
+#define OBJ2MOD_MASK (OBJ2MOD_N - 1)
+struct obj2mod_elem {
+ char *obj;
+ int mod;
+ struct obj2mod_elem *next;
+};
+
+static struct obj2mod_elem *obj2mod[OBJ2MOD_N];
+
+static void obj2mod_put(const char *obj, int mod)
+{
+ int i = strhash(obj) & OBJ2MOD_MASK;
+ struct obj2mod_elem *elem = malloc(sizeof(struct obj2mod_elem));
+
+ if (!elem) {
+ fprintf(stderr, "kallsyms: out of memory\n");
+ exit(1);
+ }
+
+ elem->obj = strdup(obj);
+ if (!elem->obj) {
+ fprintf(stderr, "kallsyms: out of memory\n");
+ free(elem);
+ exit(1);
+ }
+
+ elem->mod = mod;
+ elem->next = obj2mod[i];
+ obj2mod[i] = elem;
+}
+
+static int obj2mod_get(const char *obj)
+{
+ int i = strhash(obj) & OBJ2MOD_MASK;
+ struct obj2mod_elem *elem;
+
+ for (elem = obj2mod[i]; elem; elem = elem->next)
+ if (strcmp(elem->obj, obj) == 0)
+ return elem->mod;
+ return 0;
+}
+
+static void obj2mod_free(void)
+{
+ int i;
+
+ for (i = 0; i < OBJ2MOD_N; i++) {
+ struct obj2mod_elem *elem = obj2mod[i];
+ struct obj2mod_elem *next;
+
+ while (elem) {
+ next = elem->next;
+ free(elem->obj);
+ free(elem);
+ elem = next;
+ }
+ }
+}
+
+/*
+ * The builtin module names. The "offset" points to the name as if
+ * all builtin module names were concatenated to a single string.
+ */
+static unsigned int builtin_module_size; /* number allocated */
+static unsigned int builtin_module_len; /* number assigned */
+static char **builtin_modules; /* array of module names */
+static unsigned int *builtin_module_offsets; /* offset */
+
+/*
+ * An ordered list of address ranges and how they map to built-in modules.
+ */
+struct addrmap_entry {
+ unsigned long long addr;
+ unsigned long long size;
+ unsigned int module;
+};
+static struct addrmap_entry *addrmap;
+static int addrmap_num, addrmap_alloced;
+
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] < nm_vmlinux.out > symbols.S\n");
exit(1);
}
@@ -98,6 +194,8 @@ static bool is_ignored_symbol(const char *name, char type)
"kallsyms_markers",
"kallsyms_token_table",
"kallsyms_token_index",
+ "kallsyms_symbol_modules",
+ "kallsyms_modules",
/* Exclude linker generated symbols which vary between passes */
"_SDA_BASE_", /* ppc */
"_SDA2_BASE_", /* ppc */
@@ -174,10 +272,23 @@ static void check_symbol_range(const char *sym, unsigned long long addr,
}
}
+static int addrmap_compare(const void *keyp, const void *rangep)
+{
+ unsigned long long addr = *((const unsigned long long *)keyp);
+ const struct addrmap_entry *range = rangep;
+
+ if (addr < range->addr)
+ return -1;
+ if (addr < range->addr + range->size)
+ return 0;
+ return 1;
+}
+
static int read_symbol(FILE *in, struct sym_entry *s)
{
char sym[500], stype;
int rc;
+ struct addrmap_entry *range;
rc = fscanf(in, "%llx %c %499s\n", &s->addr, &stype, sym);
if (rc != 3) {
@@ -202,6 +313,14 @@ static int read_symbol(FILE *in, struct sym_entry *s)
check_symbol_range(sym, s->addr, text_ranges, ARRAY_SIZE(text_ranges));
check_symbol_range(sym, s->addr, &percpu_range, 1);
+ /* try to find a module that this address belongs to */
+ range = bsearch(&s->addr,
+ addrmap, addrmap_num, sizeof(*addrmap), &addrmap_compare);
+ if (range)
+ s->module = builtin_module_offsets[range->module];
+ else
+ s->module = 0;
+
/* include the type field in the symbol name, so that it gets
* compressed together */
s->len = strlen(sym) + 1;
@@ -469,6 +588,19 @@ static void write_src(void)
for (i = 0; i < 256; i++)
printf("\t.short\t%d\n", best_idx[i]);
printf("\n");
+
+ output_label("kallsyms_modules");
+ for (i = 0; i < builtin_module_len; i++)
+ printf("\t.asciz\t\"%s\"\n", builtin_modules[i]);
+ printf("\n");
+
+ for (i = 0; i < builtin_module_len; i++)
+ free(builtin_modules[i]);
+
+ output_label("kallsyms_symbol_modules");
+ for (i = 0; i < table_cnt; i++)
+ printf("\t.int\t%d\n", table[i].module);
+ printf("\n");
}
@@ -734,12 +866,169 @@ static void record_relative_base(void)
}
}
+/*
+ * Reallocate the builtin modules list.
+ */
+static void realloc_builtin_modules(void)
+{
+ builtin_module_size += 50;
+
+ builtin_modules = realloc(builtin_modules,
+ sizeof(*builtin_modules) *
+ builtin_module_size);
+ builtin_module_offsets = realloc(builtin_module_offsets,
+ sizeof(*builtin_module_offsets) *
+ builtin_module_size);
+
+ if (!builtin_modules || !builtin_module_offsets) {
+ fprintf(stderr, "kallsyms failure: out of memory.\n");
+ exit(EXIT_FAILURE);
+ }
+}
+
+/*
+ * Add a single built-in module (possibly composed of many files) to the
+ * modules list. Take the offset of the current module and return it
+ * (purely for simplicity's sake in the caller).
+ */
+static size_t add_builtin_module(const char *module_name, char **module_paths,
+ size_t offset)
+{
+ /* map the module's object paths to the module offset */
+ while (*module_paths) {
+ obj2mod_put(*module_paths, builtin_module_len);
+ module_paths++;
+ }
+
+ /* add the module name */
+ if (builtin_module_size <= builtin_module_len)
+ realloc_builtin_modules();
+ builtin_modules[builtin_module_len] = strdup(module_name);
+ builtin_module_offsets[builtin_module_len] = offset;
+ builtin_module_len++;
+
+ return (offset + strlen(module_name) + 1);
+}
+
+/*
+ * 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 (addr,size) and object, add to addrmap
+ * the range and the built-in module to which the object maps.
+ */
+ while (fscanf(f, "%llx %llx %s\n", &addr, &size, obj) == 3) {
+ int m = obj2mod_get(obj);
+
+ if (addr == 0 || size == 0 || m == 0)
+ 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].size = size;
+ addrmap[addrmap_num].module = m;
+ 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:
+ * - builtin_modules: array of built-in-module names
+ * - builtin_module_offsets: array of offsets that will later be
+ * used to access a concatenated list of built-in-module names
+ * - obj2mod: a temporary, many-to-one, hash mapping
+ * from object-file paths to built-in-module names
+ * Read ".tmp_vmlinux.ranges" (the linker map).
+ * - addrmap[] maps address ranges to built-in module names (using obj2mod)
+ */
+static void read_modules(void)
+{
+ FILE *f;
+ char *line;
+ size_t line_size;
+ size_t offset = 0;
+
+ realloc_builtin_modules(); /* initial allocation */
+
+ builtin_modules[0] = strdup(""); /* a symbol that cannot be modular */
+ builtin_module_offsets[0] = 0;
+ builtin_module_len = 1;
+ offset++;
+
+ /*
+ * Iterate over all modules in modules_thick.builtin and add each.
+ */
+ f = fopen("modules_thick.builtin", "r");
+ if (f == NULL) {
+ fprintf(stderr, "Cannot open modules_thick.builtin: %s\n",
+ strerror(errno));
+ exit(1);
+ }
+
+ while (getline(&line, &line_size, f) > 0) {
+ char **paths;
+ char *module_name = NULL;
+
+ paths = modules_thick_parse(line, &module_name);
+ if (paths == NULL)
+ break;
+ offset = add_builtin_module(module_name, paths, offset);
+ free(paths);
+ free(module_name);
+ }
+ if (ferror(f)) {
+ fprintf(stderr, "Error reading from modules_thick file: %s\n",
+ strerror(errno));
+ exit(1);
+ }
+
+ fclose(f);
+ free(line);
+
+ /*
+ * Read linker map.
+ */
+ read_linker_map();
+
+ obj2mod_free();
+}
+
int main(int argc, char **argv)
{
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;
@@ -751,6 +1040,7 @@ int main(int argc, char **argv)
} else if (argc != 1)
usage();
+ read_modules();
read_map(stdin);
shrink_table();
if (absolute_percpu)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 436379940356..ac14d292387a 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -76,6 +76,7 @@ vmlinux_link()
--start-group \
${KBUILD_VMLINUX_LIBS} \
--end-group \
+ -Map=.tmp_vmlinux.map \
${@}"
${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
@@ -88,6 +89,7 @@ vmlinux_link()
-Wl,--start-group \
${KBUILD_VMLINUX_LIBS} \
-Wl,--end-group \
+ -Wl,-Map=.tmp_vmlinux.map \
${@}"
${CC} ${CFLAGS_vmlinux} \
@@ -140,6 +142,19 @@ kallsyms()
info KSYM ${2}
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 && NF>=3 { 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="${kallsymopt} --all-symbols"
fi
@@ -152,11 +167,13 @@ kallsyms()
kallsymopt="${kallsymopt} --base-relative"
fi
+ # set up compilation
local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
local afile="`basename ${2} .o`.S"
+ # construct file and compile
${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${afile}
${CC} ${aflags} -c -o ${2} ${afile}
}
diff --git a/scripts/modules_thick.c b/scripts/modules_thick.c
new file mode 100644
index 000000000000..2d33b92060f9
--- /dev/null
+++ b/scripts/modules_thick.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * A simple modules_thick reader.
+ *
+ * (C) 2014, 2019 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"
+
+/*
+ * Parse a line from "modules_thick.builtin". Allocate and return a module name
+ * and a null-terminated array of object paths (file names). The name and array
+ * should be freed by the caller; the strings the array points to are in "line".
+ *
+ * Modules can consist of multiple paths: in this case, the portion before the
+ * colon is the path to the module, while the portion after the colon is a
+ * space-separated list of object paths. In this case, the portion before the
+ * colon is an "object file" that does not actually exist: it is merged into
+ * built-in.a without ever being written out.
+ */
+char ** __attribute__((__nonnull__))
+modules_thick_parse(char *line, char **module_name)
+{
+ size_t npaths = 1;
+ char **paths;
+ char *tmp;
+ char *olist;
+
+ /* find object-file list after the colon, if any */
+ olist = strchr(line, ':');
+ if (olist != NULL) {
+ *olist = '\0';
+ olist++;
+ olist += strspn(olist, " \n");
+ if (*olist != '\0') {
+ /* replace any trailing \n with \0 */
+ tmp = strchr(olist, '\n');
+ if (tmp != NULL)
+ *tmp = '\0';
+ } else
+ olist = NULL;
+ }
+
+ /* get pathless module_name, starting after the last '/', if any */
+ tmp = strrchr(line, '/');
+ *module_name = strdup(tmp ? tmp + 1 : line);
+
+ /* replace '-' with '_' as is done to names when built as modules */
+ for (tmp = *module_name; *tmp != '\0'; tmp++)
+ if (*tmp == '-')
+ *tmp = '_';
+
+ /* terminate at the last '.' to remove any suffix */
+ tmp = strrchr(*module_name, '.');
+ if (tmp != NULL)
+ *tmp = '\0';
+
+ /*
+ * Count the number of paths by counting the number of spaces.
+ * This could be an overestimate.
+ */
+ if (olist) {
+ npaths = 0;
+ for (tmp = olist; tmp != NULL; tmp = strchr(tmp + 1, ' '))
+ npaths++;
+ }
+
+ paths = malloc((npaths + 1) * sizeof(char *));
+ if (!paths) {
+ fprintf(stderr, "%s: out of memory\n", __func__);
+ exit(1);
+ }
+
+ /* copy the paths in */
+ if (olist) {
+ size_t i = 0;
+
+ while ((tmp = strsep(&olist, " ")) != NULL) {
+ if (i >= npaths) {
+ fprintf(stderr,
+ "%s bug: npaths overflow on module %s\n",
+ __func__, *module_name);
+ exit(1);
+ }
+ paths[i++] = tmp;
+ }
+ npaths = i;
+ } else
+ paths[0] = line; /* untransformed module name */
+
+ paths[npaths] = NULL;
+
+ return paths;
+}
diff --git a/scripts/modules_thick.h b/scripts/modules_thick.h
new file mode 100644
index 000000000000..7e2c0309c731
--- /dev/null
+++ b/scripts/modules_thick.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * A simple modules_thick reader.
+ *
+ * (C) 2014, 2019 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>
+
+/*
+ * Parse a line from "modules_thick.builtin". Return a module name
+ * and a null-terminated array of object paths (file names).
+ */
+
+char ** __attribute__((__nonnull__))
+modules_thick_parse(char *line, char **module_name);
+
+#endif
diff --git a/scripts/namespace.pl b/scripts/namespace.pl
index 1da7bca201a4..4c7615e720de 100755
--- a/scripts/namespace.pl
+++ b/scripts/namespace.pl
@@ -120,6 +120,11 @@ my %nameexception = (
'kallsyms_addresses'=> 1,
'kallsyms_offsets' => 1,
'kallsyms_relative_base'=> 1,
+ 'kallsyms_token_table'=> 1,
+ 'kallsyms_token_index'=> 1,
+ 'kallsyms_markers' => 1,
+ 'kallsyms_modules' => 1,
+ 'kallsyms_symbol_modules'=> 1,
'__this_module' => 1,
'_etext' => 1,
'_edata' => 1,
--
2.18.1
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