1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/compiler.h> 3 #include <sys/types.h> 4 #include <regex.h> 5 6 struct arm64_annotate { 7 regex_t call_insn, 8 jump_insn; 9 }; 10 11 static int arm64_mov__parse(struct arch *arch __maybe_unused, 12 struct ins_operands *ops, 13 struct map_symbol *ms __maybe_unused) 14 { 15 char *s = strchr(ops->raw, ','), *target, *endptr; 16 17 if (s == NULL) 18 return -1; 19 20 *s = '\0'; 21 ops->source.raw = strdup(ops->raw); 22 *s = ','; 23 24 if (ops->source.raw == NULL) 25 return -1; 26 27 target = ++s; 28 ops->target.raw = strdup(target); 29 if (ops->target.raw == NULL) 30 goto out_free_source; 31 32 ops->target.addr = strtoull(target, &endptr, 16); 33 if (endptr == target) 34 goto out_free_target; 35 36 s = strchr(endptr, '<'); 37 if (s == NULL) 38 goto out_free_target; 39 endptr = strchr(s + 1, '>'); 40 if (endptr == NULL) 41 goto out_free_target; 42 43 *endptr = '\0'; 44 *s = ' '; 45 ops->target.name = strdup(s); 46 *s = '<'; 47 *endptr = '>'; 48 if (ops->target.name == NULL) 49 goto out_free_target; 50 51 return 0; 52 53 out_free_target: 54 zfree(&ops->target.raw); 55 out_free_source: 56 zfree(&ops->source.raw); 57 return -1; 58 } 59 60 static int mov__scnprintf(struct ins *ins, char *bf, size_t size, 61 struct ins_operands *ops, int max_ins_name); 62 63 static struct ins_ops arm64_mov_ops = { 64 .parse = arm64_mov__parse, 65 .scnprintf = mov__scnprintf, 66 }; 67 68 static struct ins_ops *arm64__associate_instruction_ops(struct arch *arch, const char *name) 69 { 70 struct arm64_annotate *arm = arch->priv; 71 struct ins_ops *ops; 72 regmatch_t match[2]; 73 74 if (!regexec(&arm->jump_insn, name, 2, match, 0)) 75 ops = &jump_ops; 76 else if (!regexec(&arm->call_insn, name, 2, match, 0)) 77 ops = &call_ops; 78 else if (!strcmp(name, "ret")) 79 ops = &ret_ops; 80 else 81 ops = &arm64_mov_ops; 82 83 arch__associate_ins_ops(arch, name, ops); 84 return ops; 85 } 86 87 static int arm64__annotate_init(struct arch *arch, char *cpuid __maybe_unused) 88 { 89 struct arm64_annotate *arm; 90 int err; 91 92 if (arch->initialized) 93 return 0; 94 95 arm = zalloc(sizeof(*arm)); 96 if (!arm) 97 return -1; 98 99 /* bl, blr */ 100 err = regcomp(&arm->call_insn, "^blr?$", REG_EXTENDED); 101 if (err) 102 goto out_free_arm; 103 /* b, b.cond, br, cbz/cbnz, tbz/tbnz */ 104 err = regcomp(&arm->jump_insn, "^[ct]?br?\\.?(cc|cs|eq|ge|gt|hi|le|ls|lt|mi|ne|pl)?n?z?$", 105 REG_EXTENDED); 106 if (err) 107 goto out_free_call; 108 109 arch->initialized = true; 110 arch->priv = arm; 111 arch->associate_instruction_ops = arm64__associate_instruction_ops; 112 arch->objdump.comment_char = '/'; 113 arch->objdump.skip_functions_char = '+'; 114 return 0; 115 116 out_free_call: 117 regfree(&arm->call_insn); 118 out_free_arm: 119 free(arm); 120 return -1; 121 } 122