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 } 117