tools/perf/arch/arm64/annotate/instructions.c

   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 struct ins_ops *arm64__associate_instruction_ops(struct arch *arch, const char *name)
  12 {
  13         struct arm64_annotate *arm = arch->priv;
  14         struct ins_ops *ops;
  15         regmatch_t match[2];
  16
  17         if (!regexec(&arm->jump_insn, name, 2, match, 0))
  18                 ops = &jump_ops;
  19         else if (!regexec(&arm->call_insn, name, 2, match, 0))
  20                 ops = &call_ops;
  21         else if (!strcmp(name, "ret"))
  22                 ops = &ret_ops;
  23         else
  24                 return NULL;
  25
  26         arch__associate_ins_ops(arch, name, ops);
  27         return ops;
  28 }
  29
  30 static int arm64__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
  31 {
  32         struct arm64_annotate *arm;
  33         int err;
  34
  35         if (arch->initialized)
  36                 return 0;
  37
  38         arm = zalloc(sizeof(*arm));
  39         if (!arm)
  40                 return -1;
  41
  42         /* bl, blr */
  43         err = regcomp(&arm->call_insn, "^blr?$", REG_EXTENDED);
  44         if (err)
  45                 goto out_free_arm;
  46         /* b, b.cond, br, cbz/cbnz, tbz/tbnz */
  47         err = regcomp(&arm->jump_insn, "^[ct]?br?\\.?(cc|cs|eq|ge|gt|hi|le|ls|lt|mi|ne|pl)?n?z?$",
  48                       REG_EXTENDED);
  49         if (err)
  50                 goto out_free_call;
  51
  52         arch->initialized = true;
  53         arch->priv        = arm;
  54         arch->associate_instruction_ops   = arm64__associate_instruction_ops;
  55         arch->objdump.comment_char        = '/';
  56         arch->objdump.skip_functions_char = '+';
  57         return 0;
  58
  59 out_free_call:
  60         regfree(&arm->call_insn);
  61 out_free_arm:
  62         free(arm);
  63         return -1;
  64 }