*
* Usage: nm -n vmlinux | scripts/kallsyms [--all-symbols] > symbols.S
*
- * ChangeLog:
- *
- * (25/Aug/2004) Paulo Marques <pmarques@grupopie.com>
- * Changed the compression method from stem compression to "table lookup"
- * compression
- *
* Table compression uses all the unused char codes on the symbols and
* maps these to the most used substrings (tokens). For instance, it might
* map char code 0xF7 to represent "write_" and then in every symbol where
#include <string.h>
#include <ctype.h>
-/* maximum token length used. It doesn't pay to increase it a lot, because
- * very long substrings probably don't repeat themselves too often. */
-#define MAX_TOK_SIZE 11
-#define KSYM_NAME_LEN 127
-
-/* we use only a subset of the complete symbol table to gather the token count,
- * to speed up compression, at the expense of a little compression ratio */
-#define WORKING_SET 1024
-
-/* first find the best token only on the list of tokens that would profit more
- * than GOOD_BAD_THRESHOLD. Only if this list is empty go to the "bad" list.
- * Increasing this value will put less tokens on the "good" list, so the search
- * is faster. However, if the good list runs out of tokens, we must painfully
- * search the bad list. */
-#define GOOD_BAD_THRESHOLD 10
-
-/* token hash parameters */
-#define HASH_BITS 18
-#define HASH_TABLE_SIZE (1 << HASH_BITS)
-#define HASH_MASK (HASH_TABLE_SIZE - 1)
-#define HASH_BASE_OFFSET 2166136261U
-#define HASH_FOLD(a) ((a)&(HASH_MASK))
-
-/* flags to mark symbols */
-#define SYM_FLAG_VALID 1
-#define SYM_FLAG_SAMPLED 2
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
+#endif
+
+#define KSYM_NAME_LEN 128
struct sym_entry {
unsigned long long addr;
- char type;
- unsigned char flags;
- unsigned char len;
+ unsigned int len;
+ unsigned int start_pos;
unsigned char *sym;
};
+struct text_range {
+ const char *stext, *etext;
+ unsigned long long start, end;
+};
+
+static unsigned long long _text;
+static struct text_range text_ranges[] = {
+ { "_stext", "_etext" },
+ { "_sinittext", "_einittext" },
+ { "_stext_l1", "_etext_l1" }, /* Blackfin on-chip L1 inst SRAM */
+ { "_stext_l2", "_etext_l2" }, /* Blackfin on-chip L2 SRAM */
+};
+#define text_range_text (&text_ranges[0])
+#define text_range_inittext (&text_ranges[1])
static struct sym_entry *table;
-static int size, cnt;
-static unsigned long long _stext, _etext, _sinittext, _einittext;
+static unsigned int table_size, table_cnt;
static int all_symbols = 0;
+static char symbol_prefix_char = '\0';
-struct token {
- unsigned char data[MAX_TOK_SIZE];
- unsigned char len;
- /* profit: the number of bytes that could be saved by inserting this
- * token into the table */
- int profit;
- struct token *next; /* next token on the hash list */
- struct token *right; /* next token on the good/bad list */
- struct token *left; /* previous token on the good/bad list */
- struct token *smaller; /* token that is less one letter than this one */
- };
-
-struct token bad_head, good_head;
-struct token *hash_table[HASH_TABLE_SIZE];
+int token_profit[0x10000];
/* the table that holds the result of the compression */
-unsigned char best_table[256][MAX_TOK_SIZE+1];
+unsigned char best_table[256][2];
unsigned char best_table_len[256];
-static void
-usage(void)
+static void usage(void)
{
- fprintf(stderr, "Usage: kallsyms [--all-symbols] < in.map > out.S\n");
+ fprintf(stderr, "Usage: kallsyms [--all-symbols] [--symbol-prefix=<prefix char>] < in.map > out.S\n");
exit(1);
}
* This ignores the intensely annoying "mapping symbols" found
* in ARM ELF files: $a, $t and $d.
*/
-static inline int
-is_arm_mapping_symbol(const char *str)
+static inline int is_arm_mapping_symbol(const char *str)
{
return str[0] == '$' && strchr("atd", str[1])
&& (str[2] == '\0' || str[2] == '.');
}
-static int
-read_symbol(FILE *in, struct sym_entry *s)
+static int read_symbol_tr(const char *sym, unsigned long long addr)
+{
+ size_t i;
+ struct text_range *tr;
+
+ for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
+ tr = &text_ranges[i];
+
+ if (strcmp(sym, tr->stext) == 0) {
+ tr->start = addr;
+ return 0;
+ } else if (strcmp(sym, tr->etext) == 0) {
+ tr->end = addr;
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+static int read_symbol(FILE *in, struct sym_entry *s)
{
char str[500];
+ char *sym, stype;
int rc;
- rc = fscanf(in, "%llx %c %499s\n", &s->addr, &s->type, str);
+ rc = fscanf(in, "%llx %c %499s\n", &s->addr, &stype, str);
if (rc != 3) {
if (rc != EOF) {
/* skip line */
return -1;
}
+ sym = str;
+ /* skip prefix char */
+ if (symbol_prefix_char && str[0] == symbol_prefix_char)
+ sym++;
+
/* Ignore most absolute/undefined (?) symbols. */
- if (strcmp(str, "_stext") == 0)
- _stext = s->addr;
- else if (strcmp(str, "_etext") == 0)
- _etext = s->addr;
- else if (strcmp(str, "_sinittext") == 0)
- _sinittext = s->addr;
- else if (strcmp(str, "_einittext") == 0)
- _einittext = s->addr;
- else if (toupper(s->type) == 'A')
+ if (strcmp(sym, "_text") == 0)
+ _text = s->addr;
+ else if (read_symbol_tr(sym, s->addr) == 0)
+ /* nothing to do */;
+ else if (toupper(stype) == 'A')
{
/* Keep these useful absolute symbols */
- if (strcmp(str, "__kernel_syscall_via_break") &&
- strcmp(str, "__kernel_syscall_via_epc") &&
- strcmp(str, "__kernel_sigtramp") &&
- strcmp(str, "__gp"))
+ if (strcmp(sym, "__kernel_syscall_via_break") &&
+ strcmp(sym, "__kernel_syscall_via_epc") &&
+ strcmp(sym, "__kernel_sigtramp") &&
+ strcmp(sym, "__gp"))
return -1;
}
- else if (toupper(s->type) == 'U' ||
- is_arm_mapping_symbol(str))
+ else if (toupper(stype) == 'U' ||
+ is_arm_mapping_symbol(sym))
+ return -1;
+ /* exclude also MIPS ELF local symbols ($L123 instead of .L123) */
+ else if (str[0] == '$')
+ return -1;
+ /* exclude debugging symbols */
+ else if (stype == 'N')
return -1;
/* include the type field in the symbol name, so that it gets
* compressed together */
s->len = strlen(str) + 1;
- s->sym = (char *) malloc(s->len + 1);
- strcpy(s->sym + 1, str);
- s->sym[0] = s->type;
+ s->sym = malloc(s->len + 1);
+ if (!s->sym) {
+ fprintf(stderr, "kallsyms failure: "
+ "unable to allocate required amount of memory\n");
+ exit(EXIT_FAILURE);
+ }
+ strcpy((char *)s->sym + 1, str);
+ s->sym[0] = stype;
+
+ return 0;
+}
+
+static int symbol_valid_tr(struct sym_entry *s)
+{
+ size_t i;
+ struct text_range *tr;
+
+ for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) {
+ tr = &text_ranges[i];
+
+ if (s->addr >= tr->start && s->addr <= tr->end)
+ return 1;
+ }
return 0;
}
-static int
-symbol_valid(struct sym_entry *s)
+static int symbol_valid(struct sym_entry *s)
{
/* Symbols which vary between passes. Passes 1 and 2 must have
* identical symbol lists. The kallsyms_* symbols below are only added
"_SDA2_BASE_", /* ppc */
NULL };
int i;
+ int offset = 1;
+
+ /* skip prefix char */
+ if (symbol_prefix_char && *(s->sym + 1) == symbol_prefix_char)
+ offset++;
/* if --all-symbols is not specified, then symbols outside the text
* and inittext sections are discarded */
if (!all_symbols) {
- if ((s->addr < _stext || s->addr > _etext)
- && (s->addr < _sinittext || s->addr > _einittext))
+ if (symbol_valid_tr(s) == 0)
return 0;
/* Corner case. Discard any symbols with the same value as
- * _etext or _einittext, they can move between pass 1 and 2
- * when the kallsyms data is added. If these symbols move then
+ * _etext _einittext; they can move between pass 1 and 2 when
+ * the kallsyms data are added. If these symbols move then
* they may get dropped in pass 2, which breaks the kallsyms
* rules.
*/
- if ((s->addr == _etext && strcmp(s->sym + 1, "_etext")) ||
- (s->addr == _einittext && strcmp(s->sym + 1, "_einittext")))
+ if ((s->addr == text_range_text->end &&
+ strcmp((char *)s->sym + offset, text_range_text->etext)) ||
+ (s->addr == text_range_inittext->end &&
+ strcmp((char *)s->sym + offset, text_range_inittext->etext)))
return 0;
}
/* Exclude symbols which vary between passes. */
- if (strstr(s->sym + 1, "_compiled."))
+ if (strstr((char *)s->sym + offset, "_compiled."))
return 0;
for (i = 0; special_symbols[i]; i++)
- if( strcmp(s->sym + 1, special_symbols[i]) == 0 )
+ if( strcmp((char *)s->sym + offset, special_symbols[i]) == 0 )
return 0;
return 1;
}
-static void
-read_map(FILE *in)
+static void read_map(FILE *in)
{
while (!feof(in)) {
- if (cnt >= size) {
- size += 10000;
- table = realloc(table, sizeof(*table) * size);
+ if (table_cnt >= table_size) {
+ table_size += 10000;
+ table = realloc(table, sizeof(*table) * table_size);
if (!table) {
fprintf(stderr, "out of memory\n");
exit (1);
}
}
- if (read_symbol(in, &table[cnt]) == 0)
- cnt++;
+ if (read_symbol(in, &table[table_cnt]) == 0) {
+ table[table_cnt].start_pos = table_cnt;
+ table_cnt++;
+ }
}
}
static void output_label(char *label)
{
- printf(".globl %s\n",label);
+ if (symbol_prefix_char)
+ printf(".globl %c%s\n", symbol_prefix_char, label);
+ else
+ printf(".globl %s\n", label);
printf("\tALGN\n");
- printf("%s:\n",label);
+ if (symbol_prefix_char)
+ printf("%c%s:\n", symbol_prefix_char, label);
+ else
+ printf("%s:\n", label);
}
/* uncompress a compressed symbol. When this function is called, the best table
return total;
}
-static void
-write_src(void)
+static void write_src(void)
{
- int i, k, off, valid;
+ unsigned int i, k, off;
unsigned int best_idx[256];
unsigned int *markers;
- char buf[KSYM_NAME_LEN+1];
+ char buf[KSYM_NAME_LEN];
printf("#include <asm/types.h>\n");
printf("#if BITS_PER_LONG == 64\n");
printf("#define ALGN .align 4\n");
printf("#endif\n");
- printf(".data\n");
+ printf("\t.section .rodata, \"a\"\n");
+ /* Provide proper symbols relocatability by their '_text'
+ * relativeness. The symbol names cannot be used to construct
+ * normal symbol references as the list of symbols contains
+ * symbols that are declared static and are private to their
+ * .o files. This prevents .tmp_kallsyms.o or any other
+ * object from referencing them.
+ */
output_label("kallsyms_addresses");
- valid = 0;
- for (i = 0; i < cnt; i++) {
- if (table[i].flags & SYM_FLAG_VALID) {
+ for (i = 0; i < table_cnt; i++) {
+ if (toupper(table[i].sym[0]) != 'A') {
+ if (_text <= table[i].addr)
+ printf("\tPTR\t_text + %#llx\n",
+ table[i].addr - _text);
+ else
+ printf("\tPTR\t_text - %#llx\n",
+ _text - table[i].addr);
+ } else {
printf("\tPTR\t%#llx\n", table[i].addr);
- valid++;
}
}
printf("\n");
output_label("kallsyms_num_syms");
- printf("\tPTR\t%d\n", valid);
+ printf("\tPTR\t%d\n", table_cnt);
printf("\n");
/* table of offset markers, that give the offset in the compressed stream
* every 256 symbols */
- markers = (unsigned int *) malloc(sizeof(unsigned int)*((valid + 255) / 256));
+ markers = malloc(sizeof(unsigned int) * ((table_cnt + 255) / 256));
+ if (!markers) {
+ fprintf(stderr, "kallsyms failure: "
+ "unable to allocate required memory\n");
+ exit(EXIT_FAILURE);
+ }
output_label("kallsyms_names");
- valid = 0;
off = 0;
- for (i = 0; i < cnt; i++) {
-
- if (!table[i].flags & SYM_FLAG_VALID)
- continue;
-
- if ((valid & 0xFF) == 0)
- markers[valid >> 8] = off;
+ for (i = 0; i < table_cnt; i++) {
+ 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("\n");
off += table[i].len + 1;
- valid++;
}
printf("\n");
output_label("kallsyms_markers");
- for (i = 0; i < ((valid + 255) >> 8); i++)
+ for (i = 0; i < ((table_cnt + 255) >> 8); i++)
printf("\tPTR\t%d\n", markers[i]);
printf("\n");
off = 0;
for (i = 0; i < 256; i++) {
best_idx[i] = off;
- expand_symbol(best_table[i],best_table_len[i],buf);
+ expand_symbol(best_table[i], best_table_len[i], buf);
printf("\t.asciz\t\"%s\"\n", buf);
off += strlen(buf) + 1;
}
/* table lookup compression functions */
-static inline unsigned int rehash_token(unsigned int hash, unsigned char data)
-{
- return ((hash * 16777619) ^ data);
-}
-
-static unsigned int hash_token(unsigned char *data, int len)
-{
- unsigned int hash=HASH_BASE_OFFSET;
- int i;
-
- for (i = 0; i < len; i++)
- hash = rehash_token(hash, data[i]);
-
- return HASH_FOLD(hash);
-}
-
-/* find a token given its data and hash value */
-static struct token *find_token_hash(unsigned char *data, int len, unsigned int hash)
-{
- struct token *ptr;
-
- ptr = hash_table[hash];
-
- while (ptr) {
- if ((ptr->len == len) && (memcmp(ptr->data, data, len) == 0))
- return ptr;
- ptr=ptr->next;
- }
-
- return NULL;
-}
-
-static inline void insert_token_in_group(struct token *head, struct token *ptr)
-{
- ptr->right = head->right;
- ptr->right->left = ptr;
- head->right = ptr;
- ptr->left = head;
-}
-
-static inline void remove_token_from_group(struct token *ptr)
-{
- ptr->left->right = ptr->right;
- ptr->right->left = ptr->left;
-}
-
-
-/* build the counts for all the tokens that start with "data", and have lenghts
- * from 2 to "len" */
-static void learn_token(unsigned char *data, int len)
-{
- struct token *ptr,*last_ptr;
- int i, newprofit;
- unsigned int hash = HASH_BASE_OFFSET;
- unsigned int hashes[MAX_TOK_SIZE + 1];
-
- if (len > MAX_TOK_SIZE)
- len = MAX_TOK_SIZE;
-
- /* calculate and store the hash values for all the sub-tokens */
- hash = rehash_token(hash, data[0]);
- for (i = 2; i <= len; i++) {
- hash = rehash_token(hash, data[i-1]);
- hashes[i] = HASH_FOLD(hash);
- }
-
- last_ptr = NULL;
- ptr = NULL;
-
- for (i = len; i >= 2; i--) {
- hash = hashes[i];
-
- if (!ptr) ptr = find_token_hash(data, i, hash);
-
- if (!ptr) {
- /* create a new token entry */
- ptr = (struct token *) malloc(sizeof(*ptr));
-
- memcpy(ptr->data, data, i);
- ptr->len = i;
-
- /* when we create an entry, it's profit is 0 because
- * we also take into account the size of the token on
- * the compressed table. We then subtract GOOD_BAD_THRESHOLD
- * so that the test to see if this token belongs to
- * the good or bad list, is a comparison to zero */
- ptr->profit = -GOOD_BAD_THRESHOLD;
-
- ptr->next = hash_table[hash];
- hash_table[hash] = ptr;
-
- insert_token_in_group(&bad_head, ptr);
-
- ptr->smaller = NULL;
- } else {
- newprofit = ptr->profit + (ptr->len - 1);
- /* check to see if this token needs to be moved to a
- * different list */
- if((ptr->profit < 0) && (newprofit >= 0)) {
- remove_token_from_group(ptr);
- insert_token_in_group(&good_head,ptr);
- }
- ptr->profit = newprofit;
- }
-
- if (last_ptr) last_ptr->smaller = ptr;
- last_ptr = ptr;
-
- ptr = ptr->smaller;
- }
-}
-
-/* decrease the counts for all the tokens that start with "data", and have lenghts
- * from 2 to "len". This function is much simpler than learn_token because we have
- * more guarantees (tho tokens exist, the ->smaller pointer is set, etc.)
- * The two separate functions exist only because of compression performance */
-static void forget_token(unsigned char *data, int len)
-{
- struct token *ptr;
- int i, newprofit;
- unsigned int hash=0;
-
- if (len > MAX_TOK_SIZE) len = MAX_TOK_SIZE;
-
- hash = hash_token(data, len);
- ptr = find_token_hash(data, len, hash);
-
- for (i = len; i >= 2; i--) {
-
- newprofit = ptr->profit - (ptr->len - 1);
- if ((ptr->profit >= 0) && (newprofit < 0)) {
- remove_token_from_group(ptr);
- insert_token_in_group(&bad_head, ptr);
- }
- ptr->profit=newprofit;
-
- ptr=ptr->smaller;
- }
-}
-
/* count all the possible tokens in a symbol */
static void learn_symbol(unsigned char *symbol, int len)
{
int i;
for (i = 0; i < len - 1; i++)
- learn_token(symbol + i, len - i);
+ token_profit[ symbol[i] + (symbol[i + 1] << 8) ]++;
}
/* decrease the count for all the possible tokens in a symbol */
int i;
for (i = 0; i < len - 1; i++)
- forget_token(symbol + i, len - i);
+ token_profit[ symbol[i] + (symbol[i + 1] << 8) ]--;
}
-/* set all the symbol flags and do the initial token count */
+/* remove all the invalid symbols from the table and do the initial token count */
static void build_initial_tok_table(void)
{
- int i, use_it, valid;
+ unsigned int i, pos;
- valid = 0;
- for (i = 0; i < cnt; i++) {
- table[i].flags = 0;
+ pos = 0;
+ for (i = 0; i < table_cnt; i++) {
if ( symbol_valid(&table[i]) ) {
- table[i].flags |= SYM_FLAG_VALID;
- valid++;
+ if (pos != i)
+ table[pos] = table[i];
+ learn_symbol(table[pos].sym, table[pos].len);
+ pos++;
}
}
+ table_cnt = pos;
+}
- use_it = 0;
- for (i = 0; i < cnt; i++) {
-
- /* subsample the available symbols. This method is almost like
- * a Bresenham's algorithm to get uniformly distributed samples
- * across the symbol table */
- if (table[i].flags & SYM_FLAG_VALID) {
-
- use_it += WORKING_SET;
+static void *find_token(unsigned char *str, int len, unsigned char *token)
+{
+ int i;
- if (use_it >= valid) {
- table[i].flags |= SYM_FLAG_SAMPLED;
- use_it -= valid;
- }
- }
- if (table[i].flags & SYM_FLAG_SAMPLED)
- learn_symbol(table[i].sym, table[i].len);
+ for (i = 0; i < len - 1; i++) {
+ if (str[i] == token[0] && str[i+1] == token[1])
+ return &str[i];
}
+ return NULL;
}
/* replace a given token in all the valid symbols. Use the sampled symbols
* to update the counts */
-static void compress_symbols(unsigned char *str, int tlen, int idx)
+static void compress_symbols(unsigned char *str, int idx)
{
- int i, len, learn, size;
- unsigned char *p;
+ unsigned int i, len, size;
+ unsigned char *p1, *p2;
- for (i = 0; i < cnt; i++) {
-
- if (!(table[i].flags & SYM_FLAG_VALID)) continue;
+ for (i = 0; i < table_cnt; i++) {
len = table[i].len;
- learn = 0;
- p = table[i].sym;
+ 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);
+
+ size = len;
do {
+ *p2 = idx;
+ p2++;
+ size -= (p2 - p1);
+ memmove(p2, p2 + 1, size);
+ p1 = p2;
+ len--;
+
+ if (size < 2) break;
+
/* find the token on the symbol */
- p = (unsigned char *) strstr((char *) p, (char *) str);
- if (!p) break;
-
- if (!learn) {
- /* if this symbol was used to count, decrease it */
- if (table[i].flags & SYM_FLAG_SAMPLED)
- forget_symbol(table[i].sym, len);
- learn = 1;
- }
+ p2 = find_token(p1, size, str);
- *p = idx;
- size = (len - (p - table[i].sym)) - tlen + 1;
- memmove(p + 1, p + tlen, size);
- p++;
- len -= tlen - 1;
+ } while (p2);
- } while (size >= tlen);
+ table[i].len = len;
- if(learn) {
- table[i].len = len;
- /* if this symbol was used to count, learn it again */
- if(table[i].flags & SYM_FLAG_SAMPLED)
- learn_symbol(table[i].sym, len);
- }
+ /* increase the counts for this symbol's new tokens */
+ learn_symbol(table[i].sym, len);
}
}
/* search the token with the maximum profit */
-static struct token *find_best_token(void)
+static int find_best_token(void)
{
- struct token *ptr,*best,*head;
- int bestprofit;
+ int i, best, bestprofit;
bestprofit=-10000;
+ best = 0;
- /* failsafe: if the "good" list is empty search from the "bad" list */
- if(good_head.right == &good_head) head = &bad_head;
- else head = &good_head;
-
- ptr = head->right;
- best = NULL;
- while (ptr != head) {
- if (ptr->profit > bestprofit) {
- bestprofit = ptr->profit;
- best = ptr;
+ for (i = 0; i < 0x10000; i++) {
+ if (token_profit[i] > bestprofit) {
+ best = i;
+ bestprofit = token_profit[i];
}
- ptr = ptr->right;
}
-
return best;
}
/* this is the core of the algorithm: calculate the "best" table */
static void optimize_result(void)
{
- struct token *best;
- int i;
+ int i, best;
/* using the '\0' symbol last allows compress_symbols to use standard
* fast string functions */
best = find_best_token();
/* place it in the "best" table */
- best_table_len[i] = best->len;
- memcpy(best_table[i], best->data, best_table_len[i]);
- /* zero terminate the token so that we can use strstr
- in compress_symbols */
- best_table[i][best_table_len[i]]='\0';
+ best_table_len[i] = 2;
+ best_table[i][0] = best & 0xFF;
+ best_table[i][1] = (best >> 8) & 0xFF;
/* replace this token in all the valid symbols */
- compress_symbols(best_table[i], best_table_len[i], i);
+ compress_symbols(best_table[i], i);
}
}
}
/* start by placing the symbols that are actually used on the table */
static void insert_real_symbols_in_table(void)
{
- int i, j, c;
+ unsigned int i, j, c;
memset(best_table, 0, sizeof(best_table));
memset(best_table_len, 0, sizeof(best_table_len));
- for (i = 0; i < cnt; i++) {
- if (table[i].flags & SYM_FLAG_VALID) {
- for (j = 0; j < table[i].len; j++) {
- c = table[i].sym[j];
- best_table[c][0]=c;
- best_table_len[c]=1;
- }
+ for (i = 0; i < table_cnt; i++) {
+ for (j = 0; j < table[i].len; j++) {
+ c = table[i].sym[j];
+ best_table[c][0]=c;
+ best_table_len[c]=1;
}
}
}
static void optimize_token_table(void)
{
- memset(hash_table, 0, sizeof(hash_table));
-
- good_head.left = &good_head;
- good_head.right = &good_head;
-
- bad_head.left = &bad_head;
- bad_head.right = &bad_head;
-
build_initial_tok_table();
insert_real_symbols_in_table();
+ /* When valid symbol is not registered, exit to error */
+ if (!table_cnt) {
+ fprintf(stderr, "No valid symbol.\n");
+ exit(1);
+ }
+
optimize_result();
}
+/* guess for "linker script provide" symbol */
+static int may_be_linker_script_provide_symbol(const struct sym_entry *se)
+{
+ const char *symbol = (char *)se->sym + 1;
+ int len = se->len - 1;
+
+ if (len < 8)
+ return 0;
+
+ if (symbol[0] != '_' || symbol[1] != '_')
+ return 0;
+
+ /* __start_XXXXX */
+ if (!memcmp(symbol + 2, "start_", 6))
+ return 1;
+
+ /* __stop_XXXXX */
+ if (!memcmp(symbol + 2, "stop_", 5))
+ return 1;
+
+ /* __end_XXXXX */
+ if (!memcmp(symbol + 2, "end_", 4))
+ return 1;
+
+ /* __XXXXX_start */
+ if (!memcmp(symbol + len - 6, "_start", 6))
+ return 1;
+
+ /* __XXXXX_end */
+ if (!memcmp(symbol + len - 4, "_end", 4))
+ return 1;
+
+ return 0;
+}
+
+static int prefix_underscores_count(const char *str)
+{
+ const char *tail = str;
+
+ while (*tail == '_')
+ tail++;
+
+ return tail - str;
+}
+
+static int compare_symbols(const void *a, const void *b)
+{
+ const struct sym_entry *sa;
+ const struct sym_entry *sb;
+ int wa, wb;
+
+ sa = a;
+ sb = b;
+
+ /* sort by address first */
+ if (sa->addr > sb->addr)
+ return 1;
+ if (sa->addr < sb->addr)
+ return -1;
+
+ /* sort by "weakness" type */
+ wa = (sa->sym[0] == 'w') || (sa->sym[0] == 'W');
+ wb = (sb->sym[0] == 'w') || (sb->sym[0] == 'W');
+ if (wa != wb)
+ return wa - wb;
+
+ /* sort by "linker script provide" type */
+ wa = may_be_linker_script_provide_symbol(sa);
+ wb = may_be_linker_script_provide_symbol(sb);
+ if (wa != wb)
+ return wa - wb;
+
+ /* sort by the number of prefix underscores */
+ wa = prefix_underscores_count((const char *)sa->sym + 1);
+ wb = prefix_underscores_count((const char *)sb->sym + 1);
+ if (wa != wb)
+ return wa - wb;
+
+ /* sort by initial order, so that other symbols are left undisturbed */
+ return sa->start_pos - sb->start_pos;
+}
+
+static void sort_symbols(void)
+{
+ qsort(table, table_cnt, sizeof(struct sym_entry), compare_symbols);
+}
-int
-main(int argc, char **argv)
+int main(int argc, char **argv)
{
- if (argc == 2 && strcmp(argv[1], "--all-symbols") == 0)
- all_symbols = 1;
- else if (argc != 1)
+ if (argc >= 2) {
+ int i;
+ for (i = 1; i < argc; i++) {
+ if(strcmp(argv[i], "--all-symbols") == 0)
+ all_symbols = 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
+ usage();
+ }
+ } else if (argc != 1)
usage();
read_map(stdin);
+ sort_symbols();
optimize_token_table();
write_src();
return 0;
}
-
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff