patch-2.2.0-pre5 linux/scripts/ksymoops/ksyms.c

• Lines: 295
• Date: Tue Jan 5 11:13:56 1999
• Orig file: v2.2.0-pre4/linux/scripts/ksymoops/ksyms.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.0-pre4/linux/scripts/ksymoops/ksyms.c linux/scripts/ksymoops/ksyms.c
@@ -0,0 +1,294 @@
+/*
+	ksyms.c.
+
+	Process ksyms for ksymoops.
+
+	Copyright Keith Owens <kaos@ocs.com.au>.
+	Released under the GNU Public Licence, Version 2.
+
+	Fri Nov  6 10:38:42 EST 1998
+	Version 0.6b
+	Remove false warnings when comparing ksyms and lsmod.
+
+	Tue Nov  3 02:31:01 EST 1998
+	Version 0.6
+	Read lsmod (/proc/modules).
+	Move "Using_Version" copy to map.c.
+
+	Wed Oct 28 13:47:23 EST 1998
+	Version 0.4
+	Split into separate sources.
+ */
+
+#include "ksymoops.h"
+#include <malloc.h>
+#include <string.h>
+
+/* Scan one line from ksyms.  Split lines into the base symbols and the module
+ * symbols.  Separate ss for base and each module.
+ */
+static void scan_ksyms_line(const char *line)
+{
+	int i;
+	char **string = NULL;
+	SYMBOL_SET *ssp;
+	static char *prev_module = NULL;
+	static regex_t     re_ksyms;
+	static regmatch_t *re_ksyms_pmatch;
+	static char const procname[] = "scan_ksyms_line";
+
+	/* ksyms: address, symbol, optional module */
+	re_compile(&re_ksyms,
+		"^([0-9a-fA-F]{4,}) +([^ \t]+)([ \t]+\\[([^ ]+)\\])?$",
+		REG_NEWLINE|REG_EXTENDED,
+		&re_ksyms_pmatch);
+
+	i = regexec(&re_ksyms, line,
+		    re_ksyms.re_nsub+1, re_ksyms_pmatch, 0);
+	if (debug > 3)
+		fprintf(stderr, "DEBUG: %s regexec %d\n", procname, i);
+	if (i)
+		return;
+
+	/* string [1] - address, [2] - symbol, [3] - white space+module,
+	 * [4] - module.
+	 */
+	re_strings(&re_ksyms, line, re_ksyms_pmatch, &string);
+	if (string[4]) {
+		if (!prev_module || strcmp(prev_module, string[4])) {
+			/* start of a new module in ksyms */
+			++ss_ksyms_modules;
+			ss_ksyms_module = realloc(ss_ksyms_module,
+				ss_ksyms_modules*sizeof(*ss_ksyms_module));
+			if (!ss_ksyms_module)
+				malloc_error("realloc ss_ksyms_module");
+			ssp = ss_ksyms_module+ss_ksyms_modules-1;
+			ss_init(ssp, string[4]);
+			prev_module = strdup(string[4]);
+			if (!prev_module)
+				malloc_error("strdup prev_module");
+		}
+		ssp = ss_ksyms_module+ss_ksyms_modules-1;
+	}
+	else
+		ssp = &ss_ksyms_base;
+	add_symbol(ssp, string[1], ' ', 1, string[2]);
+	re_strings_free(&re_ksyms, &string);
+}
+
+/* Read the symbols from ksyms.  */
+void read_ksyms(const char *ksyms)
+{
+	FILE *f;
+	char *line = NULL;
+	int i, size;
+	static char const procname[] = "read_ksyms";
+
+	if (!ksyms)
+		return;
+	ss_init(&ss_ksyms_base, "ksyms_base");
+	if (debug)
+		fprintf(stderr, "DEBUG: %s %s\n", procname, ksyms);
+
+	if (!regular_file(ksyms, procname))
+		return;
+
+	if (!(f = fopen_local(ksyms, "r", procname)))
+		return;
+
+	while (fgets_local(&line, &size, f, procname))
+		scan_ksyms_line(line);
+
+	fclose_local(f, procname);
+	free(line);
+
+	for (i = 0; i < ss_ksyms_modules; ++i) {
+		ss_sort_na(ss_ksyms_module+i);
+		extract_Version(ss_ksyms_module+i);
+	}
+	if (ss_ksyms_base.used) {
+		ss_sort_na(&ss_ksyms_base);
+		extract_Version(&ss_ksyms_base);
+	}
+	else {
+		fprintf(stderr,
+			"Warning, no kernel symbols in ksyms, is %s a valid "
+			"ksyms file?\n",
+			ksyms);
+		++warnings;
+	}
+
+	if (debug > 1) {
+		for (i = 0; i < ss_ksyms_modules; ++i) {
+			fprintf(stderr,
+				"DEBUG: %s %s used %d out of %d entries\n",
+				procname,
+				ss_ksyms_module[i].source,
+				ss_ksyms_module[i].used,
+				ss_ksyms_module[i].alloc);
+		}
+		fprintf(stderr,
+			"DEBUG: %s %s used %d out of %d entries\n",
+			procname, ss_ksyms_base.source, ss_ksyms_base.used,
+			ss_ksyms_base.alloc);
+	}
+}
+
+/* Map each ksyms module entry to the corresponding object entry.  Tricky,
+ * see the comments in the docs about needing a unique symbol in each
+ * module.
+ */
+static void map_ksym_to_module(SYMBOL_SET *ss)
+{
+	int i, j, matches;
+	char *name = NULL;
+
+	for (i = 0; i < ss->used; ++i) {
+		matches = 0;
+		for (j = 0; j < ss_objects; ++j) {
+			name = (ss->symbol)[i].name;
+			if (find_symbol_name(ss_object+j, name, NULL)) {
+				++matches;
+				ss->related = ss_object+j;
+			}
+		}
+		if (matches == 1)
+			break;		/* unique symbol over all objects */
+		ss->related = NULL;	/* keep looking */
+	}
+	if (!(ss->related)) {
+		fprintf(stderr,
+			"Warning: cannot match loaded module %s to any "
+			"module object.  Trace may not be reliable.\n",
+			ss->source);
+		++warnings;
+	}
+	else if (debug)
+		fprintf(stderr,
+			"DEBUG: ksyms %s matches to %s based on unique "
+			"symbol %s\n",
+			ss->source, ss->related->source, name);
+}
+
+/* Map all ksyms module entries to their corresponding objects */
+void map_ksyms_to_modules(void)
+{
+	int i;
+	SYMBOL_SET *ss, *ssc;
+
+	for (i = 0; i < ss_ksyms_modules; ++i) {
+		ss = ss_ksyms_module+i;
+		map_ksym_to_module(ss);
+		if (ss->related) {
+			ssc = adjust_object_offsets(ss);
+			compare_maps(ss, ssc, 1);
+		}
+	}
+}
+
+/* Read the modules from lsmod.  */
+void read_lsmod(const char *lsmod)
+{
+	FILE *f;
+	char *line = NULL;
+	int i, size;
+	char **string = NULL;
+	static regex_t     re_lsmod;
+	static regmatch_t *re_lsmod_pmatch;
+	static char const procname[] = "read_lsmod";
+
+	if (!lsmod)
+		return;
+	ss_init(&ss_lsmod, "lsmod");
+	if (debug)
+		fprintf(stderr, "DEBUG: %s %s\n", procname, lsmod);
+
+	if (!regular_file(lsmod, procname))
+		return;
+
+	if (!(f = fopen_local(lsmod, "r", procname)))
+		return;
+
+	/* lsmod: module, size, use count, optional used by */
+	re_compile(&re_lsmod,
+		"^"
+		"[ \t]*([^ \t]+)"				/* 1 module */
+		"[ \t]*([^ \t]+)"				/* 2 size */
+		"[ \t]*([^ \t]+)"				/* 3 count */
+		"[ \t]*(.*)"					/* 4 used by */
+		"$",
+		REG_NEWLINE|REG_EXTENDED,
+		&re_lsmod_pmatch);
+
+	while (fgets_local(&line, &size, f, procname)) {
+		i = regexec(&re_lsmod, line,
+			    re_lsmod.re_nsub+1, re_lsmod_pmatch, 0);
+		if (debug > 3)
+			fprintf(stderr, "DEBUG: %s regexec %d\n", procname, i);
+		if (i)
+			continue;
+		re_strings(&re_lsmod, line, re_lsmod_pmatch, &string);
+		add_symbol(&ss_lsmod, string[2], ' ', 1, string[1]);
+	}
+
+	fclose_local(f, procname);
+	free(line);
+	re_strings_free(&re_lsmod, &string);
+	if (ss_lsmod.used)
+		ss_sort_na(&ss_lsmod);
+	else {
+		fprintf(stderr,
+			"Warning, no symbols in lsmod, is %s a valid "
+			"lsmod file?\n",
+			lsmod);
+		++warnings;
+	}
+
+	if (debug > 1)
+		fprintf(stderr,
+			"DEBUG: %s %s used %d out of %d entries\n",
+			procname, ss_lsmod.source, ss_lsmod.used,
+			ss_lsmod.alloc);
+}
+
+/* Compare modules from ksyms against module list in lsmod and vice versa.
+ * There is one ss_ for each ksyms module and a single ss_lsmod to cross
+ * check.
+ */
+void compare_ksyms_lsmod(void)
+{
+	int i, j;
+	SYMBOL_SET *ss;
+	SYMBOL *s;
+	static char const procname[] = "compare_ksyms_lsmod";
+
+	if (!(ss_lsmod.used && ss_ksyms_modules))
+		return;
+
+	s = ss_lsmod.symbol;
+	for (i = 0; i < ss_lsmod.used; ++i, ++s) {
+		for (j = 0; j < ss_ksyms_modules; ++j) {
+			ss = ss_ksyms_module+j;
+			if (strcmp(s->name, ss->source) == 0)
+				break;
+		}
+		if (j >= ss_ksyms_modules) {
+			fprintf(stderr,
+				"Warning in %s, module %s is in lsmod but not "
+				"in ksyms, probably no symbols exported\n",
+				procname, s->name);
+			++warnings;
+		}
+	}
+
+	for (i = 0; i < ss_ksyms_modules; ++i) {
+		ss = ss_ksyms_module+i;
+		if (!find_symbol_name(&ss_lsmod, ss->source, NULL)) {
+			fprintf(stderr,
+				"Error in %s, module %s is in ksyms but not "
+				"in lsmod\n",
+				procname, ss->source);
+			++errors;
+		}
+	}
+}