tools/perf/util/dwarf-regs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
   4  *
   5  * Written by: Masami Hiramatsu <mhiramat@kernel.org>
   6  */
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <debug.h>
  11 #include <dwarf-regs.h>
  12 #include <elf.h>
  13 #include <errno.h>
  14 #include <linux/kernel.h>
  15
  16 /* Define const char * {arch}_register_tbl[] */
  17 #define DEFINE_DWARF_REGSTR_TABLE
  18 #include "../arch/x86/include/dwarf-regs-table.h"
  19 #include "../arch/arm/include/dwarf-regs-table.h"
  20 #include "../arch/arm64/include/dwarf-regs-table.h"
  21 #include "../arch/sh/include/dwarf-regs-table.h"
  22 #include "../arch/powerpc/include/dwarf-regs-table.h"
  23 #include "../arch/riscv/include/dwarf-regs-table.h"
  24 #include "../arch/s390/include/dwarf-regs-table.h"
  25 #include "../arch/sparc/include/dwarf-regs-table.h"
  26 #include "../arch/xtensa/include/dwarf-regs-table.h"
  27 #include "../arch/mips/include/dwarf-regs-table.h"
  28 #include "../arch/loongarch/include/dwarf-regs-table.h"
  29
  30 #define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
  31
  32 /* Return architecture dependent register string (for kprobe-tracer) */
  33 const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags)
  34 {
  35         if (machine == EM_NONE) {
  36                 /* Generic arch - use host arch */
  37                 machine = EM_HOST;
  38         }
  39         switch (machine) {
  40         case EM_386:
  41                 return __get_dwarf_regstr(x86_32_regstr_tbl, n);
  42         case EM_X86_64:
  43                 return __get_dwarf_regstr(x86_64_regstr_tbl, n);
  44         case EM_ARM:
  45                 return __get_dwarf_regstr(arm_regstr_tbl, n);
  46         case EM_AARCH64:
  47                 return __get_dwarf_regstr(aarch64_regstr_tbl, n);
  48         case EM_CSKY:
  49                 return get_csky_regstr(n, flags);
  50         case EM_SH:
  51                 return __get_dwarf_regstr(sh_regstr_tbl, n);
  52         case EM_S390:
  53                 return __get_dwarf_regstr(s390_regstr_tbl, n);
  54         case EM_PPC:
  55         case EM_PPC64:
  56                 return __get_dwarf_regstr(powerpc_regstr_tbl, n);
  57         case EM_RISCV:
  58                 return __get_dwarf_regstr(riscv_regstr_tbl, n);
  59         case EM_SPARC:
  60         case EM_SPARCV9:
  61                 return __get_dwarf_regstr(sparc_regstr_tbl, n);
  62         case EM_XTENSA:
  63                 return __get_dwarf_regstr(xtensa_regstr_tbl, n);
  64         case EM_MIPS:
  65                 return __get_dwarf_regstr(mips_regstr_tbl, n);
  66         case EM_LOONGARCH:
  67                 return __get_dwarf_regstr(loongarch_regstr_tbl, n);
  68         default:
  69                 pr_err("ELF MACHINE %x is not supported.\n", machine);
  70         }
  71         return NULL;
  72 }
  73
  74 #if EM_HOST != EM_X86_64 && EM_HOST != EM_386
  75 __weak int get_arch_regnum(const char *name __maybe_unused)
  76 {
  77         return -ENOTSUP;
  78 }
  79 #endif
  80
  81 /* Return DWARF register number from architecture register name */
  82 int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags __maybe_unused)
  83 {
  84         char *regname = strdup(name);
  85         int reg = -1;
  86         char *p;
  87
  88         if (regname == NULL)
  89                 return -EINVAL;
  90
  91         /* For convenience, remove trailing characters */
  92         p = strpbrk(regname, " ,)");
  93         if (p)
  94                 *p = '\0';
  95
  96         if (machine == EM_NONE) {
  97                 /* Generic arch - use host arch */
  98                 machine = EM_HOST;
  99         }
 100         switch (machine) {
 101 #if EM_HOST != EM_X86_64 && EM_HOST != EM_386
 102         case EM_HOST:
 103                 reg = get_arch_regnum(regname);
 104                 break;
 105 #endif
 106         case EM_X86_64:
 107                 fallthrough;
 108         case EM_386:
 109                 reg = get_x86_regnum(regname);
 110                 break;
 111         default:
 112                 pr_err("ELF MACHINE %x is not supported.\n", machine);
 113         }
 114         free(regname);
 115         return reg;
 116 }