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Linux/tools/perf/arch/s390/util/dwarf-regs.c

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  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): Heiko Carstens <heiko.carstens@de.ibm.com>,
  7  *            Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  8  *
  9  */
 10 
 11 #include <errno.h>
 12 #include <stddef.h>
 13 #include <stdlib.h>
 14 #include <linux/kernel.h>
 15 #include <asm/ptrace.h>
 16 #include <string.h>
 17 #include <dwarf-regs.h>
 18 #include "dwarf-regs-table.h"
 19 
 20 const char *get_arch_regstr(unsigned int n)
 21 {
 22         return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
 23 }
 24 
 25 /*
 26  * Convert the register name into an offset to struct pt_regs (kernel).
 27  * This is required by the BPF prologue generator.  The BPF
 28  * program is called in the BPF overflow handler in the perf
 29  * core.
 30  */
 31 int regs_query_register_offset(const char *name)
 32 {
 33         unsigned long gpr;
 34 
 35         if (!name || strncmp(name, "%r", 2))
 36                 return -EINVAL;
 37 
 38         errno = 0;
 39         gpr = strtoul(name + 2, NULL, 10);
 40         if (errno || gpr >= 16)
 41                 return -EINVAL;
 42 
 43         return offsetof(user_pt_regs, gprs) + 8 * gpr;
 44 }
 45 

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