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kallsyms: get rid of code for absolute kallsyms

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Commit cf8e865810 ("arch: Remove Itanium (IA-64) architecture")
removed the last use of the absolute kallsyms.

Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/all/20240221202655.2423854-1-jannh@google.com/
[masahiroy@kernel.org: rebase the code and reword the commit description]
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Jann Horn
2024-02-21 21:26:53 +01:00
committed by Masahiro Yamada
parent 7efcb39e0d
commit 64e166099b
7 changed files with 32 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files
scripts/kallsyms.c
+31 -45
View File
@@ -6,7 +6,7 @@
* of the GNU General Public License, incorporated herein by reference.
*
* Usage: kallsyms [--all-symbols] [--absolute-percpu]
* [--base-relative] [--lto-clang] in.map > out.S
* [--lto-clang] in.map > out.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
@@ -63,7 +63,6 @@ static struct sym_entry **table;
static unsigned int table_size, table_cnt;
static int all_symbols;
static int absolute_percpu;
static int base_relative;
static int lto_clang;
static int token_profit[0x10000];
@@ -76,7 +75,7 @@ static unsigned char best_table_len[256];
static void usage(void)
{
fprintf(stderr, "Usage: kallsyms [--all-symbols] [--absolute-percpu] "
"[--base-relative] [--lto-clang] in.map > out.S\n");
"[--lto-clang] in.map > out.S\n");
exit(1);
}
@@ -491,54 +490,43 @@ static void write_src(void)
printf("\t.short\t%d\n", best_idx[i]);
printf("\n");
if (!base_relative)
output_label("kallsyms_addresses");
else
output_label("kallsyms_offsets");
output_label("kallsyms_offsets");
for (i = 0; i < table_cnt; i++) {
if (base_relative) {
/*
* Use the offset relative to the lowest value
* encountered of all relative symbols, and emit
* non-relocatable fixed offsets that will be fixed
* up at runtime.
*/
/*
* Use the offset relative to the lowest value
* encountered of all relative symbols, and emit
* non-relocatable fixed offsets that will be fixed
* up at runtime.
*/
long long offset;
int overflow;
long long offset;
int overflow;
if (!absolute_percpu) {
offset = table[i]->addr - relative_base;
overflow = (offset < 0 || offset > UINT_MAX);
} else if (symbol_absolute(table[i])) {
offset = table[i]->addr;
overflow = (offset < 0 || offset > INT_MAX);
} else {
offset = relative_base - table[i]->addr - 1;
overflow = (offset < INT_MIN || offset >= 0);
}
if (overflow) {
fprintf(stderr, "kallsyms failure: "
"%s symbol value %#llx out of range in relative mode\n",
symbol_absolute(table[i]) ? "absolute" : "relative",
table[i]->addr);
exit(EXIT_FAILURE);
}
printf("\t.long\t%#x /* %s */\n", (int)offset, table[i]->sym);
} else if (!symbol_absolute(table[i])) {
output_address(table[i]->addr);
if (!absolute_percpu) {
offset = table[i]->addr - relative_base;
overflow = (offset < 0 || offset > UINT_MAX);
} else if (symbol_absolute(table[i])) {
offset = table[i]->addr;
overflow = (offset < 0 || offset > INT_MAX);
} else {
printf("\tPTR\t%#llx\n", table[i]->addr);
offset = relative_base - table[i]->addr - 1;
overflow = (offset < INT_MIN || offset >= 0);
}
if (overflow) {
fprintf(stderr, "kallsyms failure: "
"%s symbol value %#llx out of range in relative mode\n",
symbol_absolute(table[i]) ? "absolute" : "relative",
table[i]->addr);
exit(EXIT_FAILURE);
}
printf("\t.long\t%#x /* %s */\n", (int)offset, table[i]->sym);
}
printf("\n");
if (base_relative) {
output_label("kallsyms_relative_base");
output_address(relative_base);
printf("\n");
}
output_label("kallsyms_relative_base");
output_address(relative_base);
printf("\n");
if (lto_clang)
for (i = 0; i < table_cnt; i++)
@@ -820,7 +808,6 @@ int main(int argc, char **argv)
static const struct option long_options[] = {
{"all-symbols", no_argument, &all_symbols, 1},
{"absolute-percpu", no_argument, &absolute_percpu, 1},
{"base-relative", no_argument, &base_relative, 1},
{"lto-clang", no_argument, &lto_clang, 1},
{},
};
@@ -841,8 +828,7 @@ int main(int argc, char **argv)
if (absolute_percpu)
make_percpus_absolute();
sort_symbols();
if (base_relative)
record_relative_base();
record_relative_base();
optimize_token_table();
write_src();
scripts/link-vmlinux.sh
-4
View File
@@ -156,10 +156,6 @@ kallsyms()
kallsymopt="${kallsymopt} --absolute-percpu"
fi
if is_enabled CONFIG_KALLSYMS_BASE_RELATIVE; then
kallsymopt="${kallsymopt} --base-relative"
fi
if is_enabled CONFIG_LTO_CLANG; then
kallsymopt="${kallsymopt} --lto-clang"
fi