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

• Lines: 231
• Date: Tue Jan 5 11:13:56 1999
• Orig file: v2.2.0-pre4/linux/scripts/ksymoops/object.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.0-pre4/linux/scripts/ksymoops/object.c linux/scripts/ksymoops/object.c
@@ -0,0 +1,230 @@
+/*
+	object.c.
+
+	object handling routines for ksymoops.  Read modules, vmlinux, etc. 
+
+	Copyright Keith Owens <kaos@ocs.com.au>.
+	Released under the GNU Public Licence, Version 2.
+
+	Wed Oct 28 13:47:23 EST 1998
+	Version 0.4
+	Split into separate sources.
+ */
+
+#include "ksymoops.h"
+#include <malloc.h>
+#include <string.h>
+#include <sys/stat.h>
+
+/* Extract all symbols definitions from an object using nm */
+static void read_nm_symbols(SYMBOL_SET *ss, const char *file)
+{
+	FILE *f;
+	char *cmd, *line = NULL, **string = NULL;
+	int i, size = 0;
+	static char const procname[] = "read_nm_symbols";
+
+	if (!regular_file(file, procname))
+		return;
+
+	cmd = malloc(strlen(path_nm)+strlen(file)+2);
+	if (!cmd)
+		malloc_error("nm command");
+	strcpy(cmd, path_nm);
+	strcat(cmd, " ");
+	strcat(cmd, file);
+	if (debug > 1)
+		fprintf(stderr, "DEBUG: %s command '%s'\n", procname, cmd);
+	if (!(f = popen_local(cmd, procname)))
+		return;
+	free(cmd);
+
+	while (fgets_local(&line, &size, f, procname)) {
+		i = regexec(&re_nm, line, re_nm.re_nsub+1, re_nm_pmatch, 0);
+		if (debug > 3)
+			fprintf(stderr, "DEBUG: %s regexec %d\n", procname, i);
+		if (i == 0) {
+			re_strings(&re_nm, line, re_nm_pmatch, &string);
+			add_symbol(ss, string[1], *string[2], 1, string[3]);
+		}
+	}
+
+	pclose_local(f, procname);
+	re_strings_free(&re_nm, &string);
+	free(line);
+	if (debug > 1)
+		fprintf(stderr,
+			"DEBUG: %s %s used %d out of %d entries\n",
+			procname, ss->source, ss->used, ss->alloc);
+}
+
+/* Read the symbols from vmlinux */
+void read_vmlinux(const char *vmlinux)
+{
+	if (!vmlinux)
+		return;
+	ss_init(&ss_vmlinux, "vmlinux");
+	read_nm_symbols(&ss_vmlinux, vmlinux);
+	if (ss_vmlinux.used) {
+		ss_sort_na(&ss_vmlinux);
+		extract_Version(&ss_vmlinux);
+	}
+	else {
+		fprintf(stderr,
+			"Warning, no kernel symbols in vmlinux, is %s a valid "
+			"vmlinux file?\n",
+			vmlinux);
+		++warnings;
+	}
+}
+
+
+/* Read the symbols from one object (module) */
+void read_object(const char *object, int i)
+{
+	ss_init(ss_object+i, object);
+	read_nm_symbols(ss_object+i, object);
+	if ((ss_object+i)->used) {
+		ss_sort_na(ss_object+i);
+		extract_Version(ss_object+i);
+	}
+	else {
+		fprintf(stderr, "Warning, no symbols in %s\n", object);
+		++warnings;
+	}
+}
+
+/* Add a new entry to the list of objects */
+static void add_ss_object(const char *file)
+{
+	++ss_objects;
+	ss_object = realloc(ss_object, ss_objects*sizeof(*ss_object));
+	if (!ss_object)
+		malloc_error("realloc ss_object");
+	ss_init(ss_object+ss_objects-1, file);
+}
+
+/* Run a directory and its subdirectories, looking for *.o files */
+static void find_objects(const char *dir)
+{
+	FILE *f;
+	char *cmd, *line = NULL;
+	int size = 0, files = 0;
+	static char const procname[] = "find_objects";
+	static char const options[] = " -follow -name '*.o' -print";
+
+	cmd = malloc(strlen(path_find)+1+strlen(dir)+strlen(options)+1);
+	if (!cmd)
+		malloc_error("find command");
+	strcpy(cmd, path_find);
+	strcat(cmd, " ");
+	strcat(cmd, dir);
+	strcat(cmd, options);
+	if (debug > 1)
+		fprintf(stderr, "DEBUG: %s command '%s'\n", procname, cmd);
+	if (!(f = popen_local(cmd, procname)))
+		return;
+	free(cmd);
+
+	while (fgets_local(&line, &size, f, procname)) {
+		if (debug > 1)
+			fprintf(stderr, "DEBUG: %s - %s\n", procname, line);
+		add_ss_object(line);
+		++files;
+	}
+
+	pclose_local(f, procname);
+	if (!files) {
+		fprintf(stderr,
+			"Warning: no *.o files in %s.  "
+			"Is %s a valid module directory?\n",
+			dir, dir);
+		++warnings;
+	}
+}
+
+/* Take the user supplied list of objects which can include directories.
+ * Expand directories into any *.o files.  The results are stored in
+ * ss_object, leaving the user supplied options untouched.
+ */
+void expand_objects(char * const *object, int objects)
+{
+	struct stat statbuf;
+	int i;
+	const char *file;
+	static char const procname[] = "expand_objects";
+
+	for (i = 0; i < objects; ++i) {
+		file = object[i];
+		if (debug > 1)
+			fprintf(stderr, "DEBUG: %s checking '%s' - ",
+				procname, file);
+		if (!stat(file, &statbuf) && S_ISDIR(statbuf.st_mode)) {
+			if (debug > 1)
+				fprintf(stderr, "directory, expanding\n");
+			find_objects(file);
+		}
+		else {
+			if (debug > 1)
+				fprintf(stderr, "not directory\n");
+			add_ss_object(file);
+		}
+	}
+}
+
+/* Map a symbol type to a section code. 0 - text, 1 - data, 2 - read only data,
+ * 3 - C (cannot relocate), 4 - the rest.
+ */
+static int section(char type)
+{
+	switch (type) {
+	case 'T':
+	case 't':
+		return 0;
+	case 'D':
+	case 'd':
+		return 1;
+	case 'R':
+	case 'r':
+		return 2;
+	case 'C':
+		return 3;
+	default:
+		return 4;
+	}
+}
+
+/* Given ksyms module data which has a related object, create a copy of the
+ * object data, adjusting the offsets to match where the module was loaded.
+ */
+SYMBOL_SET *adjust_object_offsets(SYMBOL_SET *ss)
+{
+	int i;
+	elf_addr_t adjust[] = {0, 0, 0, 0, 0};
+	SYMBOL *sk, *so;
+	SYMBOL_SET *ssc;
+
+	if (debug > 1)
+		fprintf(stderr,
+			"DEBUG: adjust_object_offsets %s\n", ss->source);
+
+	ssc = ss_copy(ss->related);
+
+	/* For common symbols, calculate the adjustment */
+	for (i = 0; i < ss->used; ++i) {
+		sk = ss->symbol+i;
+		if ((so = find_symbol_name(ssc, sk->name, NULL)))
+			adjust[section(so->type)] = sk->address - so->address;
+	}
+	for (i = 0; i < ssc->used; ++i) {
+		so = ssc->symbol+i;
+		/* Type C does not relocate well, silently ignore */
+		if (so->type != 'C' && adjust[section(so->type)])
+			so->address += adjust[section(so->type)];
+		else
+			so->keep = 0;  /* do not merge into final map */
+	}
+
+	ss->related = ssc;	/* map using adjusted copy */
+	return(ssc);
+}