1 files changed, 175 insertions, 27 deletions

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index c912137f80e..dc7aa45e80c 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -7,12 +7,6 @@
  *
  * 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
@@ -29,6 +23,10 @@
 #include <string.h>
 #include <ctype.h>
 
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
+#endif
+
 #define KSYM_NAME_LEN		128
 
 struct sym_entry {
@@ -38,11 +36,31 @@ struct sym_entry {
 	unsigned char *sym;
 };
 
+struct addr_range {
+	const char *start_sym, *end_sym;
+	unsigned long long start, end;
+};
+
+static unsigned long long _text;
+static struct addr_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 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 unsigned long long _text, _stext, _etext, _sinittext, _einittext;
 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];
 
@@ -53,7 +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);
 }
 
@@ -67,6 +88,27 @@ static inline int is_arm_mapping_symbol(const char *str)
 	       && (str[2] == '\0' || str[2] == '.');
 }
 
+static int check_symbol_range(const char *sym, unsigned long long addr,
+			      struct addr_range *ranges, int entries)
+{
+	size_t i;
+	struct addr_range *ar;
+
+	for (i = 0; i < entries; ++i) {
+		ar = &ranges[i];
+
+		if (strcmp(sym, ar->start_sym) == 0) {
+			ar->start = addr;
+			return 0;
+		} else if (strcmp(sym, ar->end_sym) == 0) {
+			ar->end = addr;
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
 static int read_symbol(FILE *in, struct sym_entry *s)
 {
 	char str[500];
@@ -75,10 +117,14 @@ static int read_symbol(FILE *in, struct sym_entry *s)
 
 	rc = fscanf(in, "%llx %c %499s\n", &s->addr, &stype, str);
 	if (rc != 3) {
-		if (rc != EOF) {
-			/* skip line */
-			fgets(str, 500, in);
-		}
+		if (rc != EOF && fgets(str, 500, in) == NULL)
+			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;
 	}
 
@@ -90,14 +136,9 @@ 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 (strcmp(sym, "_stext") == 0)
-		_stext = s->addr;
-	else if (strcmp(sym, "_etext") == 0)
-		_etext = s->addr;
-	else if (strcmp(sym, "_sinittext") == 0)
-		_sinittext = s->addr;
-	else if (strcmp(sym, "_einittext") == 0)
-		_einittext = s->addr;
+	else if (check_symbol_range(sym, s->addr, text_ranges,
+				    ARRAY_SIZE(text_ranges)) == 0)
+		/* nothing to do */;
 	else if (toupper(stype) == 'A')
 	{
 		/* Keep these useful absolute symbols */
@@ -114,6 +155,9 @@ static int read_symbol(FILE *in, struct sym_entry *s)
 	/* 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 */
@@ -127,6 +171,25 @@ 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_in_range(struct sym_entry *s, struct addr_range *ranges,
+			   int entries)
+{
+	size_t i;
+	struct addr_range *ar;
+
+	for (i = 0; i < entries; ++i) {
+		ar = &ranges[i];
+
+		if (s->addr >= ar->start && s->addr <= ar->end)
+			return 1;
+	}
+
 	return 0;
 }
 
@@ -152,6 +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++;
@@ -159,8 +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 ((s->addr < _stext || s->addr > _etext)
-		    && (s->addr < _sinittext || s->addr > _einittext))
+		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
@@ -168,10 +234,12 @@ static int symbol_valid(struct sym_entry *s)
 		 * they may get dropped in pass 2, which breaks the kallsyms
 		 * rules.
 		 */
-		if ((s->addr == _etext &&
-				strcmp((char *)s->sym + offset, "_etext")) ||
-		    (s->addr == _einittext &&
-				strcmp((char *)s->sym + offset, "_einittext")))
+		if ((s->addr == text_range_text->end &&
+				strcmp((char *)s->sym + offset,
+				       text_range_text->end_sym)) ||
+		    (s->addr == text_range_inittext->end &&
+				strcmp((char *)s->sym + offset,
+				       text_range_inittext->end_sym)))
 			return 0;
 	}
 
@@ -244,6 +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;
@@ -271,7 +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);
@@ -459,6 +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;
@@ -503,6 +578,51 @@ static void optimize_token_table(void)
 	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;
@@ -524,6 +644,18 @@ static int compare_symbols(const void *a, const void *b)
 	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;
 }
@@ -533,6 +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) {
@@ -540,12 +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();
 		}
@@ -553,6 +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();