cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

machine.c (1104B)


      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}