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

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Mapping of DWARF debug register numbers into register names.
  4  *
  5  * Copyright (C) 2010 Ian Munsie, IBM Corporation.
  6  */
  7 
  8 #include <stddef.h>
  9 #include <errno.h>
 10 #include <string.h>
 11 #include <dwarf-regs.h>
 12 #include <linux/ptrace.h>
 13 #include <linux/kernel.h>
 14 #include <linux/stringify.h>
 15 
 16 struct pt_regs_dwarfnum {
 17         const char *name;
 18         unsigned int dwarfnum;
 19         unsigned int ptregs_offset;
 20 };
 21 
 22 #define REG_DWARFNUM_NAME(r, num)                                       \
 23                 {.name = __stringify(%)__stringify(r), .dwarfnum = num,                 \
 24                 .ptregs_offset = offsetof(struct pt_regs, r)}
 25 #define GPR_DWARFNUM_NAME(num)                                          \
 26                 {.name = __stringify(%gpr##num), .dwarfnum = num,               \
 27                 .ptregs_offset = offsetof(struct pt_regs, gpr[num])}
 28 #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
 29 
 30 /*
 31  * Reference:
 32  * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html
 33  */
 34 static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
 35         GPR_DWARFNUM_NAME(0),
 36         GPR_DWARFNUM_NAME(1),
 37         GPR_DWARFNUM_NAME(2),
 38         GPR_DWARFNUM_NAME(3),
 39         GPR_DWARFNUM_NAME(4),
 40         GPR_DWARFNUM_NAME(5),
 41         GPR_DWARFNUM_NAME(6),
 42         GPR_DWARFNUM_NAME(7),
 43         GPR_DWARFNUM_NAME(8),
 44         GPR_DWARFNUM_NAME(9),
 45         GPR_DWARFNUM_NAME(10),
 46         GPR_DWARFNUM_NAME(11),
 47         GPR_DWARFNUM_NAME(12),
 48         GPR_DWARFNUM_NAME(13),
 49         GPR_DWARFNUM_NAME(14),
 50         GPR_DWARFNUM_NAME(15),
 51         GPR_DWARFNUM_NAME(16),
 52         GPR_DWARFNUM_NAME(17),
 53         GPR_DWARFNUM_NAME(18),
 54         GPR_DWARFNUM_NAME(19),
 55         GPR_DWARFNUM_NAME(20),
 56         GPR_DWARFNUM_NAME(21),
 57         GPR_DWARFNUM_NAME(22),
 58         GPR_DWARFNUM_NAME(23),
 59         GPR_DWARFNUM_NAME(24),
 60         GPR_DWARFNUM_NAME(25),
 61         GPR_DWARFNUM_NAME(26),
 62         GPR_DWARFNUM_NAME(27),
 63         GPR_DWARFNUM_NAME(28),
 64         GPR_DWARFNUM_NAME(29),
 65         GPR_DWARFNUM_NAME(30),
 66         GPR_DWARFNUM_NAME(31),
 67         REG_DWARFNUM_NAME(msr,   66),
 68         REG_DWARFNUM_NAME(ctr,   109),
 69         REG_DWARFNUM_NAME(link,  108),
 70         REG_DWARFNUM_NAME(xer,   101),
 71         REG_DWARFNUM_NAME(dar,   119),
 72         REG_DWARFNUM_NAME(dsisr, 118),
 73         REG_DWARFNUM_END,
 74 };
 75 
 76 /**
 77  * get_arch_regstr() - lookup register name from it's DWARF register number
 78  * @n:  the DWARF register number
 79  *
 80  * get_arch_regstr() returns the name of the register in struct
 81  * regdwarfnum_table from it's DWARF register number. If the register is not
 82  * found in the table, this returns NULL;
 83  */
 84 const char *get_arch_regstr(unsigned int n)
 85 {
 86         const struct pt_regs_dwarfnum *roff;
 87         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
 88                 if (roff->dwarfnum == n)
 89                         return roff->name;
 90         return NULL;
 91 }
 92 
 93 int regs_query_register_offset(const char *name)
 94 {
 95         const struct pt_regs_dwarfnum *roff;
 96         for (roff = regdwarfnum_table; roff->name != NULL; roff++)
 97                 if (!strcmp(roff->name, name))
 98                         return roff->ptregs_offset;
 99         return -EINVAL;
100 }
101 

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