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 (2408B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Mapping of DWARF debug register numbers into register names.
      4 *
      5 * Copyright (C) 2010 Will Deacon, ARM Ltd.
      6 */
      7
      8#include <errno.h>
      9#include <stddef.h>
     10#include <string.h>
     11#include <dwarf-regs.h>
     12#include <linux/ptrace.h> /* for struct user_pt_regs */
     13#include <linux/stringify.h>
     14
     15struct pt_regs_dwarfnum {
     16	const char *name;
     17	unsigned int dwarfnum;
     18};
     19
     20#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
     21#define GPR_DWARFNUM_NAME(num) \
     22	{.name = __stringify(%x##num), .dwarfnum = num}
     23#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
     24#define DWARFNUM2OFFSET(index) \
     25	(index * sizeof((struct user_pt_regs *)0)->regs[0])
     26
     27/*
     28 * Reference:
     29 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
     30 */
     31static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
     32	GPR_DWARFNUM_NAME(0),
     33	GPR_DWARFNUM_NAME(1),
     34	GPR_DWARFNUM_NAME(2),
     35	GPR_DWARFNUM_NAME(3),
     36	GPR_DWARFNUM_NAME(4),
     37	GPR_DWARFNUM_NAME(5),
     38	GPR_DWARFNUM_NAME(6),
     39	GPR_DWARFNUM_NAME(7),
     40	GPR_DWARFNUM_NAME(8),
     41	GPR_DWARFNUM_NAME(9),
     42	GPR_DWARFNUM_NAME(10),
     43	GPR_DWARFNUM_NAME(11),
     44	GPR_DWARFNUM_NAME(12),
     45	GPR_DWARFNUM_NAME(13),
     46	GPR_DWARFNUM_NAME(14),
     47	GPR_DWARFNUM_NAME(15),
     48	GPR_DWARFNUM_NAME(16),
     49	GPR_DWARFNUM_NAME(17),
     50	GPR_DWARFNUM_NAME(18),
     51	GPR_DWARFNUM_NAME(19),
     52	GPR_DWARFNUM_NAME(20),
     53	GPR_DWARFNUM_NAME(21),
     54	GPR_DWARFNUM_NAME(22),
     55	GPR_DWARFNUM_NAME(23),
     56	GPR_DWARFNUM_NAME(24),
     57	GPR_DWARFNUM_NAME(25),
     58	GPR_DWARFNUM_NAME(26),
     59	GPR_DWARFNUM_NAME(27),
     60	GPR_DWARFNUM_NAME(28),
     61	GPR_DWARFNUM_NAME(29),
     62	REG_DWARFNUM_NAME("%lr", 30),
     63	REG_DWARFNUM_NAME("%sp", 31),
     64	REG_DWARFNUM_END,
     65};
     66
     67/**
     68 * get_arch_regstr() - lookup register name from it's DWARF register number
     69 * @n:	the DWARF register number
     70 *
     71 * get_arch_regstr() returns the name of the register in struct
     72 * regdwarfnum_table from it's DWARF register number. If the register is not
     73 * found in the table, this returns NULL;
     74 */
     75const char *get_arch_regstr(unsigned int n)
     76{
     77	const struct pt_regs_dwarfnum *roff;
     78	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
     79		if (roff->dwarfnum == n)
     80			return roff->name;
     81	return NULL;
     82}
     83
     84int regs_query_register_offset(const char *name)
     85{
     86	const struct pt_regs_dwarfnum *roff;
     87
     88	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
     89		if (!strcmp(roff->name, name))
     90			return DWARFNUM2OFFSET(roff->dwarfnum);
     91	return -EINVAL;
     92}