dwarf-regs.c

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/*
 * Mapping of DWARF debug register numbers into register names.
 *
 * Copyright (C) 2010 Will Deacon, ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <dwarf-regs.h>
#include <linux/ptrace.h> /* for struct user_pt_regs */
#include <linux/stringify.h>
#include "util.h"

struct pt_regs_dwarfnum {
    const char *name;
    unsigned int dwarfnum;
};

#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
#define GPR_DWARFNUM_NAME(num) \
    {.name = __stringify(%x##num), .dwarfnum = num}
#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
#define DWARFNUM2OFFSET(index) \
    (index * sizeof((struct user_pt_regs *)0)->regs[0])

/*
 * Reference:
 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
 */
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),
    REG_DWARFNUM_NAME("%lr", 30),
    REG_DWARFNUM_NAME("%sp", 31),
    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 DWARFNUM2OFFSET(roff->dwarfnum);
    return -EINVAL;
}