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

   1// SPDX-License-Identifier: GPL-2.0
   2#include <unistd.h>
   3#include <stdio.h>
   4#include <string.h>
   5#include "util.h"
   6#include "machine.h"
   7#include "api/fs/fs.h"
   8#include "debug.h"
   9#include "symbol.h"
  10
  11int arch__fix_module_text_start(u64 *start, u64 *size, const char *name)
  12{
  13        u64 m_start = *start;
  14        char path[PATH_MAX];
  15
  16        snprintf(path, PATH_MAX, "module/%.*s/sections/.text",
  17                                (int)strlen(name) - 2, name + 1);
  18        if (sysfs__read_ull(path, (unsigned long long *)start) < 0) {
  19                pr_debug2("Using module %s start:%#lx\n", path, m_start);
  20                *start = m_start;
  21        } else {
  22                /* Successful read of the modules segment text start address.
  23                 * Calculate difference between module start address
  24                 * in memory and module text segment start address.
  25                 * For example module load address is 0x3ff8011b000
  26                 * (from /proc/modules) and module text segment start
  27                 * address is 0x3ff8011b870 (from file above).
  28                 *
  29                 * Adjust the module size and subtract the GOT table
  30                 * size located at the beginning of the module.
  31                 */
  32                *size -= (*start - m_start);
  33        }
  34
  35        return 0;
  36}
  37
  38/* On s390 kernel text segment start is located at very low memory addresses,
  39 * for example 0x10000. Modules are located at very high memory addresses,
  40 * for example 0x3ff xxxx xxxx. The gap between end of kernel text segment
  41 * and beginning of first module's text segment is very big.
  42 * Therefore do not fill this gap and do not assign it to the kernel dso map.
  43 */
  44void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
  45{
  46        if (strchr(p->name, '[') == NULL && strchr(c->name, '['))
  47                /* Last kernel symbol mapped to end of page */
  48                p->end = roundup(p->end, page_size);
  49        else
  50                p->end = c->start;
  51        pr_debug4("%s sym:%s end:%#lx\n", __func__, p->name, p->end);
  52}
  53