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-rw-r--r--scripts/kallsyms.c121
1 files changed, 65 insertions, 56 deletions
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 5c34edd98b3e..a566d8201b56 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -33,8 +33,8 @@ struct sym_entry {
unsigned long long addr;
unsigned int len;
unsigned int start_pos;
- unsigned char *sym;
unsigned int percpu_absolute;
+ unsigned char sym[0];
};
struct addr_range {
@@ -55,7 +55,7 @@ static struct addr_range percpu_range = {
"__per_cpu_start", "__per_cpu_end", -1ULL, 0
};
-static struct sym_entry *table;
+static struct sym_entry **table;
static unsigned int table_size, table_cnt;
static int all_symbols;
static int absolute_percpu;
@@ -174,49 +174,55 @@ static void check_symbol_range(const char *sym, unsigned long long addr,
}
}
-static int read_symbol(FILE *in, struct sym_entry *s)
+static struct sym_entry *read_symbol(FILE *in)
{
char name[500], type;
+ unsigned long long addr;
+ unsigned int len;
+ struct sym_entry *sym;
int rc;
- rc = fscanf(in, "%llx %c %499s\n", &s->addr, &type, name);
+ rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
if (rc != 3) {
if (rc != EOF && fgets(name, 500, in) == NULL)
fprintf(stderr, "Read error or end of file.\n");
- return -1;
+ return NULL;
}
if (strlen(name) >= KSYM_NAME_LEN) {
fprintf(stderr, "Symbol %s too long for kallsyms (%zu >= %d).\n"
"Please increase KSYM_NAME_LEN both in kernel and kallsyms.c\n",
name, strlen(name), KSYM_NAME_LEN);
- return -1;
+ return NULL;
}
if (is_ignored_symbol(name, type))
- return -1;
+ return NULL;
/* Ignore most absolute/undefined (?) symbols. */
if (strcmp(name, "_text") == 0)
- _text = s->addr;
+ _text = addr;
- check_symbol_range(name, s->addr, text_ranges, ARRAY_SIZE(text_ranges));
- check_symbol_range(name, s->addr, &percpu_range, 1);
+ check_symbol_range(name, addr, text_ranges, ARRAY_SIZE(text_ranges));
+ check_symbol_range(name, addr, &percpu_range, 1);
/* include the type field in the symbol name, so that it gets
* compressed together */
- s->len = strlen(name) + 1;
- s->sym = malloc(s->len + 1);
- if (!s->sym) {
+
+ len = strlen(name) + 1;
+
+ sym = malloc(sizeof(*sym) + len);
+ if (!sym) {
fprintf(stderr, "kallsyms failure: "
"unable to allocate required amount of memory\n");
exit(EXIT_FAILURE);
}
- strcpy(sym_name(s), name);
- s->sym[0] = type;
-
- s->percpu_absolute = 0;
+ sym->addr = addr;
+ sym->len = len;
+ sym->sym[0] = type;
+ memcpy(sym_name(sym), name, len);
+ sym->percpu_absolute = 0;
- return 0;
+ return sym;
}
static int symbol_in_range(const struct sym_entry *s,
@@ -268,12 +274,12 @@ static void shrink_table(void)
pos = 0;
for (i = 0; i < table_cnt; i++) {
- if (symbol_valid(&table[i])) {
+ if (symbol_valid(table[i])) {
if (pos != i)
table[pos] = table[i];
pos++;
} else {
- free(table[i].sym);
+ free(table[i]);
}
}
table_cnt = pos;
@@ -287,7 +293,15 @@ static void shrink_table(void)
static void read_map(FILE *in)
{
+ struct sym_entry *sym;
+
while (!feof(in)) {
+ sym = read_symbol(in);
+ if (!sym)
+ continue;
+
+ sym->start_pos = table_cnt;
+
if (table_cnt >= table_size) {
table_size += 10000;
table = realloc(table, sizeof(*table) * table_size);
@@ -296,10 +310,8 @@ static void read_map(FILE *in)
exit (1);
}
}
- if (read_symbol(in, &table[table_cnt]) == 0) {
- table[table_cnt].start_pos = table_cnt;
- table_cnt++;
- }
+
+ table[table_cnt++] = sym;
}
}
@@ -387,27 +399,27 @@ static void write_src(void)
int overflow;
if (!absolute_percpu) {
- offset = table[i].addr - relative_base;
+ offset = table[i]->addr - relative_base;
overflow = (offset < 0 || offset > UINT_MAX);
- } else if (symbol_absolute(&table[i])) {
- offset = table[i].addr;
+ } else if (symbol_absolute(table[i])) {
+ offset = table[i]->addr;
overflow = (offset < 0 || offset > INT_MAX);
} else {
- offset = relative_base - table[i].addr - 1;
+ 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);
+ symbol_absolute(table[i]) ? "absolute" : "relative",
+ table[i]->addr);
exit(EXIT_FAILURE);
}
printf("\t.long\t%#x\n", (int)offset);
- } else if (!symbol_absolute(&table[i])) {
- output_address(table[i].addr);
+ } else if (!symbol_absolute(table[i])) {
+ output_address(table[i]->addr);
} else {
- printf("\tPTR\t%#llx\n", table[i].addr);
+ printf("\tPTR\t%#llx\n", table[i]->addr);
}
}
printf("\n");
@@ -437,12 +449,12 @@ static void write_src(void)
if ((i & 0xFF) == 0)
markers[i >> 8] = off;
- printf("\t.byte 0x%02x", table[i].len);
- for (k = 0; k < table[i].len; k++)
- printf(", 0x%02x", table[i].sym[k]);
+ printf("\t.byte 0x%02x", table[i]->len);
+ for (k = 0; k < table[i]->len; k++)
+ printf(", 0x%02x", table[i]->sym[k]);
printf("\n");
- off += table[i].len + 1;
+ off += table[i]->len + 1;
}
printf("\n");
@@ -496,7 +508,7 @@ static void build_initial_tok_table(void)
unsigned int i;
for (i = 0; i < table_cnt; i++)
- learn_symbol(table[i].sym, table[i].len);
+ learn_symbol(table[i]->sym, table[i]->len);
}
static unsigned char *find_token(unsigned char *str, int len,
@@ -520,15 +532,15 @@ static void compress_symbols(const unsigned char *str, int idx)
for (i = 0; i < table_cnt; i++) {
- len = table[i].len;
- p1 = table[i].sym;
+ len = table[i]->len;
+ p1 = table[i]->sym;
/* find the token on the symbol */
p2 = find_token(p1, len, str);
if (!p2) continue;
/* decrease the counts for this symbol's tokens */
- forget_symbol(table[i].sym, len);
+ forget_symbol(table[i]->sym, len);
size = len;
@@ -547,10 +559,10 @@ static void compress_symbols(const unsigned char *str, int idx)
} while (p2);
- table[i].len = len;
+ table[i]->len = len;
/* increase the counts for this symbol's new tokens */
- learn_symbol(table[i].sym, len);
+ learn_symbol(table[i]->sym, len);
}
}
@@ -606,8 +618,8 @@ static void insert_real_symbols_in_table(void)
unsigned int i, j, c;
for (i = 0; i < table_cnt; i++) {
- for (j = 0; j < table[i].len; j++) {
- c = table[i].sym[j];
+ for (j = 0; j < table[i]->len; j++) {
+ c = table[i]->sym[j];
best_table[c][0]=c;
best_table_len[c]=1;
}
@@ -660,13 +672,10 @@ static int may_be_linker_script_provide_symbol(const struct sym_entry *se)
static int compare_symbols(const void *a, const void *b)
{
- const struct sym_entry *sa;
- const struct sym_entry *sb;
+ const struct sym_entry *sa = *(const struct sym_entry **)a;
+ const struct sym_entry *sb = *(const struct sym_entry **)b;
int wa, wb;
- sa = a;
- sb = b;
-
/* sort by address first */
if (sa->addr > sb->addr)
return 1;
@@ -697,7 +706,7 @@ static int compare_symbols(const void *a, const void *b)
static void sort_symbols(void)
{
- qsort(table, table_cnt, sizeof(struct sym_entry), compare_symbols);
+ qsort(table, table_cnt, sizeof(table[0]), compare_symbols);
}
static void make_percpus_absolute(void)
@@ -705,14 +714,14 @@ 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)) {
+ if (symbol_in_range(table[i], &percpu_range, 1)) {
/*
* Keep the 'A' override for percpu symbols to
* ensure consistent behavior compared to older
* versions of this tool.
*/
- table[i].sym[0] = 'A';
- table[i].percpu_absolute = 1;
+ table[i]->sym[0] = 'A';
+ table[i]->percpu_absolute = 1;
}
}
@@ -722,12 +731,12 @@ static void record_relative_base(void)
unsigned int i;
for (i = 0; i < table_cnt; i++)
- if (!symbol_absolute(&table[i])) {
+ if (!symbol_absolute(table[i])) {
/*
* The table is sorted by address.
* Take the first non-absolute symbol value.
*/
- relative_base = table[i].addr;
+ relative_base = table[i]->addr;
return;
}
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.