108 lines
3 KiB
Diff
108 lines
3 KiB
Diff
--- a/scripts/kallsyms.c
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+++ b/scripts/kallsyms.c
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@@ -54,6 +54,7 @@ static struct text_range text_ranges[] =
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static struct sym_entry *table;
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static unsigned int table_size, table_cnt;
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static int all_symbols = 0;
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+static int uncompressed = 0;
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static char symbol_prefix_char = '\0';
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static unsigned long long kernel_start_addr = 0;
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@@ -367,6 +368,9 @@ static void write_src(void)
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free(markers);
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+ if (uncompressed)
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+ return;
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+
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output_label("kallsyms_token_table");
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off = 0;
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for (i = 0; i < 256; i++) {
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@@ -425,6 +429,9 @@ static void *find_token(unsigned char *s
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{
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int i;
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+ if (uncompressed)
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+ return NULL;
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+
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for (i = 0; i < len - 1; i++) {
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if (str[i] == token[0] && str[i+1] == token[1])
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return &str[i];
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@@ -497,6 +504,9 @@ static void optimize_result(void)
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{
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int i, best;
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+ if (uncompressed)
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+ return;
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+
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/* using the '\0' symbol last allows compress_symbols to use standard
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* fast string functions */
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for (i = 255; i >= 0; i--) {
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@@ -656,7 +666,9 @@ int main(int argc, char **argv)
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} else if (strncmp(argv[i], "--page-offset=", 14) == 0) {
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const char *p = &argv[i][14];
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kernel_start_addr = strtoull(p, NULL, 16);
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- } else
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+ } else if (strcmp(argv[i], "--uncompressed") == 0)
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+ uncompressed = 1;
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+ else
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usage();
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}
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} else if (argc != 1)
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -1245,6 +1245,17 @@ config SYSCTL_ARCH_UNALIGN_ALLOW
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the unaligned access emulation.
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see arch/parisc/kernel/unaligned.c for reference
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+config KALLSYMS_UNCOMPRESSED
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+ bool "Keep kallsyms uncompressed"
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+ depends on KALLSYMS
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+ help
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+ Normally kallsyms contains compressed symbols (using a token table),
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+ reducing the uncompressed kernel image size. Keeping the symbol table
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+ uncompressed significantly improves the size of this part in compressed
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+ kernel images.
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+
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+ Say N unless you need compressed kernel images to be small.
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+
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config HOTPLUG
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def_bool y
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--- a/scripts/link-vmlinux.sh
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+++ b/scripts/link-vmlinux.sh
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@@ -84,6 +84,10 @@ kallsyms()
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kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
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+ if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then
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+ kallsymopt="${kallsymopt} --uncompressed"
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+ fi
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+
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local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
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${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
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--- a/kernel/kallsyms.c
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+++ b/kernel/kallsyms.c
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@@ -108,6 +108,11 @@ static unsigned int kallsyms_expand_symb
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* For every byte on the compressed symbol data, copy the table
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* entry for that byte.
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*/
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+#ifdef CONFIG_KALLSYMS_UNCOMPRESSED
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+ memcpy(result, data + 1, len - 1);
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+ result += len - 1;
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+ len = 0;
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+#endif
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while (len) {
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tptr = &kallsyms_token_table[kallsyms_token_index[*data]];
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data++;
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@@ -140,6 +145,9 @@ tail:
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*/
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static char kallsyms_get_symbol_type(unsigned int off)
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{
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+#ifdef CONFIG_KALLSYMS_UNCOMPRESSED
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+ return kallsyms_names[off + 1];
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+#endif
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/*
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* Get just the first code, look it up in the token table,
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* and return the first char from this token.
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