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-rw-r--r--scripts/kallsyms.c94
1 files changed, 72 insertions, 22 deletions
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 60dd3eb9366..dc7aa45e80c 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -36,13 +36,13 @@ struct sym_entry {
unsigned char *sym;
};
-struct text_range {
- const char *stext, *etext;
+struct addr_range {
+ const char *start_sym, *end_sym;
unsigned long long start, end;
};
static unsigned long long _text;
-static struct text_range text_ranges[] = {
+static struct addr_range text_ranges[] = {
{ "_stext", "_etext" },
{ "_sinittext", "_einittext" },
{ "_stext_l1", "_etext_l1" }, /* Blackfin on-chip L1 inst SRAM */
@@ -51,10 +51,16 @@ static struct text_range text_ranges[] = {
#define text_range_text (&text_ranges[0])
#define text_range_inittext (&text_ranges[1])
+static struct addr_range percpu_range = {
+ "__per_cpu_start", "__per_cpu_end", -1ULL, 0
+};
+
static struct sym_entry *table;
static unsigned int table_size, table_cnt;
static int all_symbols = 0;
+static int absolute_percpu = 0;
static char symbol_prefix_char = '\0';
+static unsigned long long kernel_start_addr = 0;
int token_profit[0x10000];
@@ -65,7 +71,10 @@ unsigned char best_table_len[256];
static void usage(void)
{
- fprintf(stderr, "Usage: kallsyms [--all-symbols] [--symbol-prefix=<prefix char>] < in.map > out.S\n");
+ fprintf(stderr, "Usage: kallsyms [--all-symbols] "
+ "[--symbol-prefix=<prefix char>] "
+ "[--page-offset=<CONFIG_PAGE_OFFSET>] "
+ "< in.map > out.S\n");
exit(1);
}
@@ -79,19 +88,20 @@ static inline int is_arm_mapping_symbol(const char *str)
&& (str[2] == '\0' || str[2] == '.');
}
-static int read_symbol_tr(const char *sym, unsigned long long addr)
+static int check_symbol_range(const char *sym, unsigned long long addr,
+ struct addr_range *ranges, int entries)
{
size_t i;
- struct text_range *tr;
+ struct addr_range *ar;
- for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
- tr = &text_ranges[i];
+ for (i = 0; i < entries; ++i) {
+ ar = &ranges[i];
- if (strcmp(sym, tr->stext) == 0) {
- tr->start = addr;
+ if (strcmp(sym, ar->start_sym) == 0) {
+ ar->start = addr;
return 0;
- } else if (strcmp(sym, tr->etext) == 0) {
- tr->end = addr;
+ } else if (strcmp(sym, ar->end_sym) == 0) {
+ ar->end = addr;
return 0;
}
}
@@ -111,6 +121,12 @@ static int read_symbol(FILE *in, struct sym_entry *s)
fprintf(stderr, "Read error or end of file.\n");
return -1;
}
+ if (strlen(str) > KSYM_NAME_LEN) {
+ fprintf(stderr, "Symbol %s too long for kallsyms (%zu vs %d).\n"
+ "Please increase KSYM_NAME_LEN both in kernel and kallsyms.c\n",
+ str, strlen(str), KSYM_NAME_LEN);
+ return -1;
+ }
sym = str;
/* skip prefix char */
@@ -120,7 +136,8 @@ static int read_symbol(FILE *in, struct sym_entry *s)
/* Ignore most absolute/undefined (?) symbols. */
if (strcmp(sym, "_text") == 0)
_text = s->addr;
- else if (read_symbol_tr(sym, s->addr) == 0)
+ else if (check_symbol_range(sym, s->addr, text_ranges,
+ ARRAY_SIZE(text_ranges)) == 0)
/* nothing to do */;
else if (toupper(stype) == 'A')
{
@@ -154,18 +171,22 @@ static int read_symbol(FILE *in, struct sym_entry *s)
strcpy((char *)s->sym + 1, str);
s->sym[0] = stype;
+ /* Record if we've found __per_cpu_start/end. */
+ check_symbol_range(sym, s->addr, &percpu_range, 1);
+
return 0;
}
-static int symbol_valid_tr(struct sym_entry *s)
+static int symbol_in_range(struct sym_entry *s, struct addr_range *ranges,
+ int entries)
{
size_t i;
- struct text_range *tr;
+ struct addr_range *ar;
- for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
- tr = &text_ranges[i];
+ for (i = 0; i < entries; ++i) {
+ ar = &ranges[i];
- if (s->addr >= tr->start && s->addr <= tr->end)
+ if (s->addr >= ar->start && s->addr <= ar->end)
return 1;
}
@@ -194,6 +215,9 @@ static int symbol_valid(struct sym_entry *s)
int i;
int offset = 1;
+ if (s->addr < kernel_start_addr)
+ return 0;
+
/* skip prefix char */
if (symbol_prefix_char && *(s->sym + 1) == symbol_prefix_char)
offset++;
@@ -201,7 +225,8 @@ static int symbol_valid(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_valid_tr(s) == 0)
+ if (symbol_in_range(s, 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
@@ -210,9 +235,11 @@ static int symbol_valid(struct sym_entry *s)
* rules.
*/
if ((s->addr == text_range_text->end &&
- strcmp((char *)s->sym + offset, text_range_text->etext)) ||
+ strcmp((char *)s->sym + offset,
+ text_range_text->end_sym)) ||
(s->addr == text_range_inittext->end &&
- strcmp((char *)s->sym + offset, text_range_inittext->etext)))
+ strcmp((char *)s->sym + offset,
+ text_range_inittext->end_sym)))
return 0;
}
@@ -285,6 +312,11 @@ static int expand_symbol(unsigned char *data, int len, char *result)
return total;
}
+static int symbol_absolute(struct sym_entry *s)
+{
+ return toupper(s->sym[0]) == 'A';
+}
+
static void write_src(void)
{
unsigned int i, k, off;
@@ -312,7 +344,7 @@ static void write_src(void)
*/
output_label("kallsyms_addresses");
for (i = 0; i < table_cnt; i++) {
- if (toupper(table[i].sym[0]) != 'A') {
+ if (!symbol_absolute(&table[i])) {
if (_text <= table[i].addr)
printf("\tPTR\t_text + %#llx\n",
table[i].addr - _text);
@@ -500,6 +532,8 @@ static void optimize_result(void)
/* find the token with the breates profit value */
best = find_best_token();
+ if (token_profit[best] == 0)
+ break;
/* place it in the "best" table */
best_table_len[i] = 2;
@@ -631,6 +665,15 @@ static void sort_symbols(void)
qsort(table, table_cnt, sizeof(struct sym_entry), compare_symbols);
}
+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))
+ table[i].sym[0] = 'A';
+}
+
int main(int argc, char **argv)
{
if (argc >= 2) {
@@ -638,12 +681,17 @@ int main(int argc, char **argv)
for (i = 1; i < argc; i++) {
if(strcmp(argv[i], "--all-symbols") == 0)
all_symbols = 1;
+ else if (strcmp(argv[i], "--absolute-percpu") == 0)
+ absolute_percpu = 1;
else if (strncmp(argv[i], "--symbol-prefix=", 16) == 0) {
char *p = &argv[i][16];
/* skip quote */
if ((*p == '"' && *(p+2) == '"') || (*p == '\'' && *(p+2) == '\''))
p++;
symbol_prefix_char = *p;
+ } else if (strncmp(argv[i], "--page-offset=", 14) == 0) {
+ const char *p = &argv[i][14];
+ kernel_start_addr = strtoull(p, NULL, 16);
} else
usage();
}
@@ -651,6 +699,8 @@ int main(int argc, char **argv)
usage();
read_map(stdin);
+ if (absolute_percpu)
+ make_percpus_absolute();
sort_symbols();
optimize_token_table();
write_src();
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 21:54:09 +0000