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Kernel+LibC: Add sys$perf_register_string()
This syscall allows userspace to register a keyed string that appears in a new "strings" JSON object in profile output. This will be used to add custom strings to profile signposts. :^)
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7 changed files with 43 additions and 0 deletions
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@ -21,4 +21,18 @@ KResultOr<FlatPtr> Process::sys$perf_event(int type, FlatPtr arg1, FlatPtr arg2)
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return events_buffer->append(type, arg1, arg2, nullptr);
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}
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KResultOr<FlatPtr> Process::sys$perf_register_string(FlatPtr string_id, Userspace<char const*> user_string, size_t user_string_length)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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auto* events_buffer = current_perf_events_buffer();
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if (!events_buffer)
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return KSuccess;
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auto string_or_error = try_copy_kstring_from_user(user_string, user_string_length);
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if (string_or_error.is_error())
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return string_or_error.error();
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return events_buffer->register_string(string_id, string_or_error.release_value());
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}
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}
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