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/* -*- linux-c -*-
* Symbols and modules functions for staprun.
*
* Copyright (C) 2006 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#include "librelay.h"
#include "../sym.h"
static int send_data(void *data, int len)
{
return write(control_channel, data, len);
}
/* Get the sections for a module. Put them in the supplied buffer */
/* in the following order: */
/* [struct _stp_module][struct _stp_symbol sections ...][string data] */
/* Return the total length of all the data. */
static int get_sections(char *name, char *data_start, int datalen)
{
char dir[64], filename[64], buf[32], strdata_start[2048];
char *strdata=strdata_start, *data=data_start;
int fd, len;
struct _stp_module *mod = (struct _stp_module *)data_start;
struct dirent *d;
DIR *secdir;
struct _stp_symbol *sec;
/* start of data is a struct _stp_module */
data += sizeof(struct _stp_module);
sprintf(dir,"/sys/module/%s/sections", name);
if ((secdir = opendir(dir)) == NULL)
return 0;
memset(mod, 0, sizeof(struct _stp_module));
strncpy(mod->name, name, STP_MODULE_NAME_LEN);
while ((d = readdir(secdir))) {
char *secname = d->d_name;
sprintf(filename,"/sys/module/%s/sections/%s", name,secname);
if ((fd = open(filename,O_RDONLY)) >= 0) {
if (read(fd, buf, 32) > 0) {
/* filter out some non-useful stuff */
if (!strncmp(secname,"__",2)
|| !strcmp(secname,".module_sig")
|| !strcmp(secname,".modinfo")
|| !strcmp(secname,".strtab")
|| !strcmp(secname,".symtab") ) {
close(fd);
continue;
}
/* create next section */
sec = (struct _stp_symbol *)data;
data += sizeof(struct _stp_symbol);
sec->addr = strtoul(buf,NULL,16);
sec->symbol = (char *)(strdata - strdata_start);
mod->num_sections++;
/* now create string data for the section */
strcpy(strdata, secname);
strdata += strlen(secname) + 1;
/* These sections are used a lot so keep the values handy */
if (!strcmp(secname, ".data"))
mod->data = sec->addr;
if (!strcmp(secname, ".text"))
mod->text = sec->addr;
if (!strcmp(secname, ".gnu.linkonce.this_module"))
mod->module = sec->addr;
}
close(fd);
}
}
closedir(secdir);
/* consolidate buffers */
len = strdata - strdata_start;
if ((len + data - data_start) > datalen) {
fprintf(stderr, "ERROR: overflowed buffers in get_sections. Size needed = %d\n",
(int)(len + data - data_start));
cleanup_and_exit(0);
}
strdata = strdata_start;
while (len--)
*data++ = *strdata++;
return data - data_start;
}
void send_module (char *modname)
{
char data[8192];
int len = get_sections(modname, data, sizeof(data));
if (len)
send_request(STP_MODULE, data, len);
}
int do_module (void *data)
{
struct _stp_module *mod = (struct _stp_module *)data;
if (mod->name[0] == 0) {
struct dirent *d;
DIR *moddir = opendir("/sys/module");
if (moddir) {
while ((d = readdir(moddir)))
send_module(d->d_name);
closedir(moddir);
}
return 1;
}
send_module(mod->name);
return 0;
}
static int compar(const void *p1, const void *p2)
{
struct _stp_symbol *s1 = (struct _stp_symbol *)p1;
struct _stp_symbol *s2 = (struct _stp_symbol *)p2;
if (s1->addr == s2->addr) return 0;
if (s1->addr < s2->addr) return -1;
return 1;
}
#define MAX_SYMBOLS 32768
void do_kernel_symbols(void)
{
FILE *kallsyms;
char *sym_base, *data_base;
char buf[128], *ptr, *name, *data, *dataptr, *datamax, type;
unsigned long addr;
struct _stp_symbol *syms;
int num_syms, i = 0;
sym_base = malloc(MAX_SYMBOLS*sizeof(struct _stp_symbol)+sizeof(long));
data_base = malloc(MAX_SYMBOLS*32);
if (data_base == NULL || sym_base == NULL) {
fprintf(stderr,"Failed to allocate memory for symbols\n");
cleanup_and_exit(0);
}
*(int *)data_base = STP_SYMBOLS;
dataptr = data = data_base + sizeof(int);
datamax = dataptr + MAX_SYMBOLS*32 - sizeof(int);
*(int *)sym_base = STP_SYMBOLS;
syms = (struct _stp_symbol *)(sym_base + sizeof(long));
kallsyms = fopen ("/proc/kallsyms", "r");
if (!kallsyms) {
perror("Fatal error: Unable to open /proc/kallsyms:");
cleanup_and_exit(0);
}
/* put empty string in data */
*dataptr++ = 0;
while (fgets_unlocked(buf, 128, kallsyms) && dataptr < datamax) {
addr = strtoul(buf, &ptr, 16);
while (isspace(*ptr)) ptr++;
type = *ptr++;
if (type == 't' || type == 'T' || type == 'A') {
while (isspace(*ptr)) ptr++;
name = ptr++;
while (!isspace(*ptr)) ptr++;
*ptr++ = 0;
while (*ptr && *ptr != '[') ptr++;
if (*ptr)
continue; /* it was a module */
syms[i].addr = addr;
syms[i].symbol = (char *)(dataptr - data);
while (*name) *dataptr++ = *name++;
*dataptr++ = 0;
i++;
if (dataptr > datamax - 1000)
break;
}
}
num_syms = i;
qsort(syms, num_syms, sizeof(struct _stp_symbol), compar);
#if 0
for (i=0;i<num_syms;i++) {
fprintf(stderr,"%p , \"%s\"\n", (char *)(syms[i].addr),
(char *)((long)(syms[i].symbol) + data));
}
#endif
/* send header */
*(int *)buf = num_syms;
*(int *)(buf+4) = (unsigned)(dataptr - data);
send_request(STP_SYMBOLS, buf, 8);
/* send syms */
send_data(sym_base, num_syms*sizeof(struct _stp_symbol)+sizeof(long));
/* send data */
send_data(data_base, dataptr-data+sizeof(int));
free(data_base);
free(sym_base);
fclose(kallsyms);
if (dataptr >= datamax) {
fprintf(stderr,"Error: overflowed symbol data area.\n");
cleanup_and_exit(0);
}
}
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