tools/perf/arch/s390/util/machine.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <inttypes.h>
   3 #include <unistd.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <internal/lib.h> // page_size
   7 #include "machine.h"
   8 #include "api/fs/fs.h"
   9 #include "debug.h"
  10 #include "symbol.h"
  11
  12 int arch__fix_module_text_start(u64 *start, u64 *size, const char *name)
  13 {
  14         u64 m_start = *start;
  15         char path[PATH_MAX];
  16
  17         snprintf(path, PATH_MAX, "module/%.*s/sections/.text",
  18                                 (int)strlen(name) - 2, name + 1);
  19         if (sysfs__read_ull(path, (unsigned long long *)start) < 0) {
  20                 pr_debug2("Using module %s start:%#lx\n", path, m_start);
  21                 *start = m_start;
  22         } else {
  23                 /* Successful read of the modules segment text start address.
  24                  * Calculate difference between module start address
  25                  * in memory and module text segment start address.
  26                  * For example module load address is 0x3ff8011b000
  27                  * (from /proc/modules) and module text segment start
  28                  * address is 0x3ff8011b870 (from file above).
  29                  *
  30                  * Adjust the module size and subtract the GOT table
  31                  * size located at the beginning of the module.
  32                  */
  33                 *size -= (*start - m_start);
  34         }
  35
  36         return 0;
  37 }