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 (996B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Mapping of DWARF debug register numbers into register names.
      4 *
      5 * Copyright IBM Corp. 2010, 2017
      6 * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
      7 *
      8 */
      9
     10#include <errno.h>
     11#include <stddef.h>
     12#include <stdlib.h>
     13#include <linux/kernel.h>
     14#include <asm/ptrace.h>
     15#include <string.h>
     16#include <dwarf-regs.h>
     17#include "dwarf-regs-table.h"
     18
     19const char *get_arch_regstr(unsigned int n)
     20{
     21	return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
     22}
     23
     24/*
     25 * Convert the register name into an offset to struct pt_regs (kernel).
     26 * This is required by the BPF prologue generator.  The BPF
     27 * program is called in the BPF overflow handler in the perf
     28 * core.
     29 */
     30int regs_query_register_offset(const char *name)
     31{
     32	unsigned long gpr;
     33
     34	if (!name || strncmp(name, "%r", 2))
     35		return -EINVAL;
     36
     37	errno = 0;
     38	gpr = strtoul(name + 2, NULL, 10);
     39	if (errno || gpr >= 16)
     40		return -EINVAL;
     41
     42	return offsetof(user_pt_regs, gprs) + 8 * gpr;
     43}