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1// SPDX-License-Identifier: GPL-2.02/*3 * Mapping of DWARF debug register numbers into register names.4 *5 * Copyright IBM Corp. 2010, 20176 * 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 BPF27 * program is called in the BPF overflow handler in the perf28 * 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}44