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| // SPDX-License-Identifier: GPL-2.0-only
| /*
| * Mapping of DWARF debug register numbers into register names.
| *
| * Copyright (C) 2010 Will Deacon, ARM Ltd.
| */
|
| #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>
|
| 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,
| };
|
| /**
| * 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 DWARFNUM2OFFSET(roff->dwarfnum);
| return -EINVAL;
| }
|
|
