text: /*
   * Mapping of DWARF debug register numbers into register names.
   *
   * Copyright (C) 2010 Ian Munsie, IBM Corporation.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  
  #include <stddef.h>
  #include <errno.h>
  #include <string.h>
  #include <dwarf-regs.h>
  #include <linux/ptrace.h>
  #include <linux/kernel.h>
  #include <linux/stringify.h>
  #include "util.h"
  
  struct pt_regs_dwarfnum {
  	const char *name;
  	unsigned int dwarfnum;
  	unsigned int ptregs_offset;
  };
  
  #define REG_DWARFNUM_NAME(r, num)					\
  		{.name = __stringify(%)__stringify(r), .dwarfnum = num,			\
  		.ptregs_offset = offsetof(struct pt_regs, r)}
  #define GPR_DWARFNUM_NAME(num)						\
  		{.name = __stringify(%gpr##num), .dwarfnum = num,		\
  		.ptregs_offset = offsetof(struct pt_regs, gpr[num])}
  #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
  
  /*
   * Reference:
   * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
   */
  static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  	GPR_DWARFNUM_NAME(0),
  	GPR_DWARFNUM_NAME(1),
  	GPR_DWARFNUM_NAME(2),
  	GPR_DWARFNUM_NAME(3),
  	GPR_DWARFNUM_NAME(4),
  	GPR_DWARFNUM_NAME(5),
  	GPR_DWARFNUM_NAME(6),
  	GPR_DWARFNUM_NAME(7),
  	GPR_DWARFNUM_NAME(8),
  	GPR_DWARFNUM_NAME(9),
  	GPR_DWARFNUM_NAME(10),
  	GPR_DWARFNUM_NAME(11),
  	GPR_DWARFNUM_NAME(12),
  	GPR_DWARFNUM_NAME(13),
  	GPR_DWARFNUM_NAME(14),
  	GPR_DWARFNUM_NAME(15),
  	GPR_DWARFNUM_NAME(16),
  	GPR_DWARFNUM_NAME(17),
  	GPR_DWARFNUM_NAME(18),
  	GPR_DWARFNUM_NAME(19),
  	GPR_DWARFNUM_NAME(20),
  	GPR_DWARFNUM_NAME(21),
  	GPR_DWARFNUM_NAME(22),
  	GPR_DWARFNUM_NAME(23),
  	GPR_DWARFNUM_NAME(24),
  	GPR_DWARFNUM_NAME(25),
  	GPR_DWARFNUM_NAME(26),
  	GPR_DWARFNUM_NAME(27),
  	GPR_DWARFNUM_NAME(28),
  	GPR_DWARFNUM_NAME(29),
  	GPR_DWARFNUM_NAME(30),
  	GPR_DWARFNUM_NAME(31),
  	REG_DWARFNUM_NAME(msr,   66),
  	REG_DWARFNUM_NAME(ctr,   109),
  	REG_DWARFNUM_NAME(link,  108),
  	REG_DWARFNUM_NAME(xer,   101),
  	REG_DWARFNUM_NAME(dar,   119),
  	REG_DWARFNUM_NAME(dsisr, 118),
  	REG_DWARFNUM_END,
  };
  
  /**
   * get_arch_regstr() - lookup register name from it's DWARF register number
   * @n:	the DWARF register number
   *
   * get_arch_regstr() returns the name of the register in struct
   * regdwarfnum_table from it's DWARF register number. If the register is not
   * found in the table, this returns NULL;
   */
  const char *get_arch_regstr(unsigned int n)
  {
  	const struct pt_regs_dwarfnum *roff;
  	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  		if (roff->dwarfnum == n)
  			return roff->name;
  	return NULL;
  }
  
  int regs_query_register_offset(const char *name)
  {
  	const struct pt_regs_dwarfnum *roff;
  	for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  		if (!strcmp(roff->name, name))
  			return roff->ptregs_offset;
  	return -EINVAL;
  }
  