cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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segment_regs.c (1136B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright 2018, Christophe Leroy CS S.I.
      4 * <christophe.leroy@c-s.fr>
      5 *
      6 * This dumps the content of Segment Registers
      7 */
      8
      9#include <linux/debugfs.h>
     10
     11static void seg_show(struct seq_file *m, int i)
     12{
     13	u32 val = mfsr(i << 28);
     14
     15	seq_printf(m, "0x%01x0000000-0x%01xfffffff ", i, i);
     16	seq_printf(m, "Kern key %d ", (val >> 30) & 1);
     17	seq_printf(m, "User key %d ", (val >> 29) & 1);
     18	if (val & 0x80000000) {
     19		seq_printf(m, "Device 0x%03x", (val >> 20) & 0x1ff);
     20		seq_printf(m, "-0x%05x", val & 0xfffff);
     21	} else {
     22		if (val & 0x10000000)
     23			seq_puts(m, "No Exec ");
     24		seq_printf(m, "VSID 0x%06x", val & 0xffffff);
     25	}
     26	seq_puts(m, "\n");
     27}
     28
     29static int sr_show(struct seq_file *m, void *v)
     30{
     31	int i;
     32
     33	seq_puts(m, "---[ User Segments ]---\n");
     34	for (i = 0; i < TASK_SIZE >> 28; i++)
     35		seg_show(m, i);
     36
     37	seq_puts(m, "\n---[ Kernel Segments ]---\n");
     38	for (; i < 16; i++)
     39		seg_show(m, i);
     40
     41	return 0;
     42}
     43
     44DEFINE_SHOW_ATTRIBUTE(sr);
     45
     46static int __init sr_init(void)
     47{
     48	debugfs_create_file("segment_registers", 0400, arch_debugfs_dir,
     49			    NULL, &sr_fops);
     50	return 0;
     51}
     52device_initcall(sr_init);