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 }
38
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