LXR linux/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
  12int 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}
  38
  39/* On s390 kernel text segment start is located at very low memory addresses,
  40 * for example 0x10000. Modules are located at very high memory addresses,
  41 * for example 0x3ff xxxx xxxx. The gap between end of kernel text segment
  42 * and beginning of first module's text segment is very big.
  43 * Therefore do not fill this gap and do not assign it to the kernel dso map.
  44 */
  45void arch__symbols__fixup_end(struct symbol *p, struct symbol *c)
  46{
  47        if (strchr(p->name, '[') == NULL && strchr(c->name, '['))
  48                /* Last kernel symbol mapped to end of page */
  49                p->end = roundup(p->end, page_size);
  50        else
  51                p->end = c->start;
  52        pr_debug4("%s sym:%s end:%#" PRIx64 "\n", __func__, p->name, p->end);
  53}
  54