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/*
map.c.
Read System.map for ksymoops, create merged System.map.
Copyright Keith Owens <kaos@ocs.com.au>.
Released under the GNU Public Licence, Version 2.
Tue Nov 3 02:31:01 EST 1998
Version 0.6
Remove addresses 0-4095 from merged map after writing new map.
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>
/* Read the symbols from System.map */
void read_system_map(const char *system_map)
{
FILE *f;
char *line = NULL, **string = NULL;
int i, size = 0;
static char const procname[] = "read_system_map";
if (!system_map)
return;
ss_init(&ss_system_map, "System.map");
if (debug)
fprintf(stderr, "DEBUG: %s %s\n", procname, system_map);
if (!regular_file(system_map, procname))
return;
if (!(f = fopen_local(system_map, "r", procname)))
return;
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_system_map, string[1], *string[2],
1, string[3]);
}
}
fclose_local(f, procname);
re_strings_free(&re_nm, &string);
free(line);
if (ss_system_map.used) {
ss_sort_na(&ss_system_map);
extract_Version(&ss_system_map);
}
else {
fprintf(stderr,
"Warning, no kernel symbols in System.map, is %s a "
"valid System.map file?\n",
system_map);
++warnings;
}
if (debug > 1)
fprintf(stderr,
"DEBUG: %s %s used %d out of %d entries\n",
procname,
ss_system_map.source,
ss_system_map.used,
ss_system_map.alloc);
}
/* Compare two maps, all symbols in the first should appear in the second. */
void compare_maps(const SYMBOL_SET *ss1, const SYMBOL_SET *ss2,
int precedence)
{
int i, start = 0;
SYMBOL *s1, *s2, **sdrop = precedence == 1 ? &s2 : &s1;
const SYMBOL_SET **ssdrop = precedence == 1 ? &ss2 : &ss1;
if (!(ss1->used && ss2->used))
return;
if (debug > 1)
fprintf(stderr,
"DEBUG: compare_maps %s vs %s, %s takes precedence\n",
ss1->source, ss2->source,
precedence == 1 ? ss1->source : ss2->source);
for (i = 0; i < ss1->used; ++i) {
s1 = ss1->symbol+i;
if (!(s1->keep))
continue;
s2 = find_symbol_name(ss2, s1->name, &start);
if (!s2) {
/* Some types only appear in nm output, not in things
* like System.map. Silently ignore them.
*/
if (s1->type == 'a' || s1->type == 't')
continue;
fprintf(stderr,
"Warning: %s symbol %s not found in %s. "
"Ignoring %s entry\n",
ss1->source, s1->name,
ss2->source, (*ssdrop)->source);
++warnings;
if (*sdrop)
(*sdrop)->keep = 0;
}
else if (s1->address != s2->address) {
/* Type C symbols cannot be resolved from nm to ksyms,
* silently ignore them.
*/
if (s1->type == 'C' || s2->type == 'C')
continue;
fprintf(stderr,
"Warning: mismatch on symbol %s %c, "
"%s says %lx, %s says %lx. "
"Ignoring %s entry\n",
s1->name, s1->type, ss1->source, s1->address,
ss2->source, s2->address, (*ssdrop)->source);
++warnings;
if (*sdrop)
(*sdrop)->keep = 0;
}
else
++start; /* step to next entry in ss2 */
}
}
/* Append the second symbol set onto the first */
static void append_map(SYMBOL_SET *ss1, const SYMBOL_SET *ss2)
{
int i;
SYMBOL *s;
if (!ss2 || !ss2->used)
return;
if (debug > 1)
fprintf(stderr, "DEBUG: append_map %s to %s\n",
ss2->source, ss1->source);
for (i = 0; i < ss2->used; ++i) {
s = ss2->symbol+i;
if (s->keep)
add_symbol_n(ss1, s->address, s->type, 1,
s->name);
}
}
/* Compare the various sources and build a merged system map */
void merge_maps(const char *save_system_map)
{
int i;
SYMBOL *s;
FILE *f;
static char const procname[] = "merge_maps";
if (debug)
fprintf(stderr, "DEBUG: %s\n", procname);
/* Using_Versions only appears in ksyms, copy to other tables */
if ((s = find_symbol_name(&ss_ksyms_base,
"Using_Versions", 0))) {
if (ss_system_map.used) {
add_symbol_n(&ss_system_map, s->address,
s->type, s->keep, s->name);
ss_sort_na(&ss_system_map);
}
if (ss_vmlinux.used) {
add_symbol_n(&ss_vmlinux, s->address, s->type,
s->keep, s->name);
ss_sort_na(&ss_vmlinux);
}
}
compare_Version(); /* highlight any version problems first */
compare_ksyms_lsmod(); /* highlight any missing modules next */
compare_maps(&ss_ksyms_base, &ss_vmlinux, 2);
compare_maps(&ss_system_map, &ss_vmlinux, 2);
compare_maps(&ss_vmlinux, &ss_system_map, 1);
compare_maps(&ss_ksyms_base, &ss_system_map, 2);
if (ss_objects) {
map_ksyms_to_modules();
}
ss_init(&ss_merged, "merged");
append_map(&ss_merged, &ss_vmlinux);
append_map(&ss_merged, &ss_ksyms_base);
append_map(&ss_merged, &ss_system_map);
for (i = 0; i < ss_ksyms_modules; ++i)
append_map(&ss_merged, (ss_ksyms_module+i)->related);
if (!ss_merged.used) {
fprintf(stderr, "Warning, no symbols in merged map\n");
++warnings;
}
/* drop duplicates, type a (registers) and gcc2_compiled. */
ss_sort_atn(&ss_merged);
s = ss_merged.symbol;
for (i = 0; i < ss_merged.used-1; ++i) {
if (s->type == 'a' ||
(s->type == 't' && !strcmp(s->name, "gcc2_compiled.")))
s->keep = 0;
else if (strcmp(s->name, (s+1)->name) == 0 &&
s->address == (s+1)->address) {
if (s->type != ' ')
(s+1)->keep = 0;
else
s->keep = 0;
}
++s;
}
ss_sort_atn(&ss_merged); /* will remove dropped variables */
if (save_system_map) {
if (debug)
fprintf(stderr, "DEBUG: writing merged map to %s\n",
save_system_map);
if (!(f = fopen_local(save_system_map, "w", procname)))
return;
s = ss_merged.symbol;
for (i = 0; i < ss_merged.used; ++i) {
if (s->keep)
fprintf(f, "%s %c %s\n",
format_address(s->address),
s->type, s->name);
++s;
}
}
/* The merged map may contain symbols with an address of 0, e.g.
* Using_Versions. These give incorrect results for low addresses in
* map_address, such addresses map to "Using_Versions+xxx". Remove
* any addresses below (arbitrary) 4096 from the merged map. AFAIK,
* Linux does not use the first page on any arch.
*/
for (i = 0; i < ss_merged.used; ++i) {
if ((ss_merged.symbol+i)->address < 4096)
(ss_merged.symbol+i)->keep = 0;
else
break;
}
if (i)
ss_sort_atn(&ss_merged); /* remove dropped variables */
}
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