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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dwarf-regs.c (2682B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Mapping of DWARF debug register numbers into register names.
      4 *
      5 * Copyright (C) 2010 Ian Munsie, IBM Corporation.
      6 */
      7
      8#include <stddef.h>
      9#include <errno.h>
     10#include <string.h>
     11#include <dwarf-regs.h>
     12#include <linux/ptrace.h>
     13#include <linux/kernel.h>
     14#include <linux/stringify.h>
     15
     16struct pt_regs_dwarfnum {
     17	const char *name;
     18	unsigned int dwarfnum;
     19	unsigned int ptregs_offset;
     20};
     21
     22#define REG_DWARFNUM_NAME(r, num)					\
     23		{.name = __stringify(%)__stringify(r), .dwarfnum = num,			\
     24		.ptregs_offset = offsetof(struct pt_regs, r)}
     25#define GPR_DWARFNUM_NAME(num)						\
     26		{.name = __stringify(%gpr##num), .dwarfnum = num,		\
     27		.ptregs_offset = offsetof(struct pt_regs, gpr[num])}
     28#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
     29
     30/*
     31 * Reference:
     32 * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
     33 */
     34static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
     35	GPR_DWARFNUM_NAME(0),
     36	GPR_DWARFNUM_NAME(1),
     37	GPR_DWARFNUM_NAME(2),
     38	GPR_DWARFNUM_NAME(3),
     39	GPR_DWARFNUM_NAME(4),
     40	GPR_DWARFNUM_NAME(5),
     41	GPR_DWARFNUM_NAME(6),
     42	GPR_DWARFNUM_NAME(7),
     43	GPR_DWARFNUM_NAME(8),
     44	GPR_DWARFNUM_NAME(9),
     45	GPR_DWARFNUM_NAME(10),
     46	GPR_DWARFNUM_NAME(11),
     47	GPR_DWARFNUM_NAME(12),
     48	GPR_DWARFNUM_NAME(13),
     49	GPR_DWARFNUM_NAME(14),
     50	GPR_DWARFNUM_NAME(15),
     51	GPR_DWARFNUM_NAME(16),
     52	GPR_DWARFNUM_NAME(17),
     53	GPR_DWARFNUM_NAME(18),
     54	GPR_DWARFNUM_NAME(19),
     55	GPR_DWARFNUM_NAME(20),
     56	GPR_DWARFNUM_NAME(21),
     57	GPR_DWARFNUM_NAME(22),
     58	GPR_DWARFNUM_NAME(23),
     59	GPR_DWARFNUM_NAME(24),
     60	GPR_DWARFNUM_NAME(25),
     61	GPR_DWARFNUM_NAME(26),
     62	GPR_DWARFNUM_NAME(27),
     63	GPR_DWARFNUM_NAME(28),
     64	GPR_DWARFNUM_NAME(29),
     65	GPR_DWARFNUM_NAME(30),
     66	GPR_DWARFNUM_NAME(31),
     67	REG_DWARFNUM_NAME(msr,   66),
     68	REG_DWARFNUM_NAME(ctr,   109),
     69	REG_DWARFNUM_NAME(link,  108),
     70	REG_DWARFNUM_NAME(xer,   101),
     71	REG_DWARFNUM_NAME(dar,   119),
     72	REG_DWARFNUM_NAME(dsisr, 118),
     73	REG_DWARFNUM_END,
     74};
     75
     76/**
     77 * get_arch_regstr() - lookup register name from it's DWARF register number
     78 * @n:	the DWARF register number
     79 *
     80 * get_arch_regstr() returns the name of the register in struct
     81 * regdwarfnum_table from it's DWARF register number. If the register is not
     82 * found in the table, this returns NULL;
     83 */
     84const char *get_arch_regstr(unsigned int n)
     85{
     86	const struct pt_regs_dwarfnum *roff;
     87	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
     88		if (roff->dwarfnum == n)
     89			return roff->name;
     90	return NULL;
     91}
     92
     93int regs_query_register_offset(const char *name)
     94{
     95	const struct pt_regs_dwarfnum *roff;
     96	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
     97		if (!strcmp(roff->name, name))
     98			return roff->ptregs_offset;
     99	return -EINVAL;
    100}