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scripts/kallsyms: exclude symbols generated by itself dynamically

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Drop the symbols generated by scripts/kallsyms itself automatically
instead of maintaining the symbol list manually.

Pass the kallsyms object from the previous kallsyms step (if it exists)
as the third parameter of scripts/mksysmap, which will weed out the
generated symbols from the input to the next kallsyms step.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2023-03-08 20:52:39 +09:00
parent c4802044a0
commit ca09bf48f9
3 changed files with 13 additions and 20 deletions
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16
scripts/kallsyms.c
View File

@ -104,22 +104,6 @@ static bool is_ignored_symbol(const char *name, char type)
{
/* Symbol names that exactly match to the following are ignored.*/
static const char * const ignored_symbols[] = {
/*
* Symbols which vary between passes. Passes 1 and 2 must have
* identical symbol lists. The kallsyms_* symbols below are
* only added after pass 1, they would be included in pass 2
* when --all-symbols is specified so exclude them to get a
* stable symbol list.
*/
"kallsyms_addresses",
"kallsyms_offsets",
"kallsyms_relative_base",
"kallsyms_num_syms",
"kallsyms_names",
"kallsyms_markers",
"kallsyms_token_table",
"kallsyms_token_index",
"kallsyms_seqs_of_names",
/* Exclude linker generated symbols which vary between passes */
"_SDA_BASE_", /* ppc */
"_SDA2_BASE_", /* ppc */

6
scripts/link-vmlinux.sh
View File

@ -174,7 +174,7 @@ kallsyms_step()
kallsyms_S=${kallsyms_vmlinux}.S
vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o}
mksysmap ${kallsyms_vmlinux} ${kallsyms_vmlinux}.syms
mksysmap ${kallsyms_vmlinux} ${kallsyms_vmlinux}.syms ${kallsymso_prev}
kallsyms ${kallsyms_vmlinux}.syms ${kallsyms_S}
info AS ${kallsyms_S}
@ -188,7 +188,7 @@ kallsyms_step()
mksysmap()
{
info NM ${2}
${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} ${3}
}
sorttable()
@ -277,7 +277,7 @@ if is_enabled CONFIG_DEBUG_INFO_BTF && is_enabled CONFIG_BPF; then
${RESOLVE_BTFIDS} vmlinux
fi
mksysmap vmlinux System.map
mksysmap vmlinux System.map ${kallsymso}
if is_enabled CONFIG_BUILDTIME_TABLE_SORT; then
info SORTTAB vmlinux

11
scripts/mksysmap
View File

@ -4,7 +4,7 @@
# tools to retrieve the actual addresses of symbols in the kernel.
#
# Usage
# mksysmap vmlinux System.map
# mksysmap vmlinux System.map [exclude]
#####
@ -52,4 +52,13 @@ ${NM} -n ${1} | sed >${2} -e "
# for LoongArch?
/ L0$/d
# ---------------------------------------------------------------------------
# Ignored kallsyms symbols
#
# If the 3rd parameter exists, symbols from it will be omitted from the output.
# This makes kallsyms have the identical symbol lists in the step 1 and 2.
# Without this, the step2 would get new symbols generated by scripts/kallsyms.c
# when CONFIG_KALLSYMS_ALL is enabled. That might require one more pass.
$(if [ $# -ge 3 ]; then ${NM} ${3} | sed -n '/ U /!s:.* \([^ ]*\)$:/ \1$/d:p'; fi)
"