// SPDX-License-Identifier: GPL-2.0
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/*
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* Mapping of DWARF debug register numbers into register names.
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*
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* Copyright IBM Corp. 2010, 2017
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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* Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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*
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*/
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <linux/kernel.h>
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#include <asm/ptrace.h>
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#include <string.h>
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#include <dwarf-regs.h>
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#include "dwarf-regs-table.h"
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const char *get_arch_regstr(unsigned int n)
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{
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return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
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}
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/*
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* Convert the register name into an offset to struct pt_regs (kernel).
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* This is required by the BPF prologue generator. The BPF
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* program is called in the BPF overflow handler in the perf
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* core.
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*/
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int regs_query_register_offset(const char *name)
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{
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unsigned long gpr;
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if (!name || strncmp(name, "%r", 2))
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return -EINVAL;
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errno = 0;
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gpr = strtoul(name + 2, NULL, 10);
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if (errno || gpr >= 16)
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return -EINVAL;
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return offsetof(user_pt_regs, gprs) + 8 * gpr;
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}
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