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