dwarf-regs.c

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/*
 * 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,
};

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;
}