Fix Fastcall Linux Kernel Issue

Sometimes you might get a fastcall Linux Kernel error message on your computer. There can be many reasons for this error to appear. The __fastcall calling convention describes that function arguments must eventually be passed into registers when. This calling convention only applies to the X86 architecture.

What is a preserved register?

“Retained across operation calls” means that the value stored in the register is not changed by the procedure. It can usually be assumed that the value in the register after the call to surgery is the same as the value in the register before the particular call.

I am include a function that tries to be called from entry_32.S. It will be called immediately before calling the system function to communicate with the processing.

In order not to dial a phone number and pass parameters, I can say my_foo like this

fastcall linux kernel

 fastcall int inline my_foo N); (int Input_32 /*in.S*/    press %eax    CFI_ADJUST_CFA_OFFSET 4   save all   ..../* my signal starts */    Call my_foo    cmpl $0, %eax    syscall_false jne movl PT_ORIG_EAX(%esp),%eax/* my rule ends */    reach *sys_call_table(,%eax,4)


  • asmlinkage: Core This macro (defined by Linux/include/asm-i386/linkage in .h) tells the compiler to use all argument functions for our own stack.
  • __user: The macro simply __user tells the compiler (via noderef) that the pointer should not be dereferenced (because it really doesn’t make sense in the current address space).
  • likely/unlikely: It optimizes the order of the generated assembler code to optimize CPU pipeline usage. To do this, a person arranges the code to execute the most likely branch, excluding each jmp instruction (which results into exhaustion of the CPU pipeline). It should only be used when the likely most part is very, very likely, or conversely, when the most unlikely branch is very, very unlikely.
  • fastcall: Since time immemorial, part of the architecture has stored x86 runtime parameters on the stack. In modern (PPC architectures, etc. sparc. are used) registers: this is much faster, since there is nothing to do to return the parameters without a doubt: the parameters are still there, in the registers. The x86 world (including Linux) continues to make extensive use of for parameter passing, compatibility points, why with software, compilers, etc. They just added real extensions to compilers to further tell the compiler to use subscriptions to pass parameters to a natural function that usually includes a “shortcut” to work with keywords that are critical to performance paths.
  • Memory Arbiter: In multiprocessor systems, all processors typically share the same memory, so standalone processors are concurrent.They refer to the operational on the memory chip. Since READ or WRITE business operations must be performed serially on the RAM chip, a hardware circuit – the memory arbiter – is inserted partly between the bus AND each RAM chip to provide access to the processor when the chip is free, and for delay. This. when the chip is busy processing requests for the next processor._init
  • macros and __initdata: The __init macro prevents the function from destroying the initialization and freeing its memory when the initialization function exits. For drivers, this only applies to built-in drivers, not to loaded modules. __initdata acts like __init, but for initialization components, not for functions.
  • This article describes the calling conventions used in x86 microprocessor architecture content.

  • The order in which atomic (scalar) parameters or individual attributes of a complex parameter are usually assigned
  • How they are passed (are parameters pushed on the stack, pushed into registers, or both)
  • Which journals should the brought f Option for stalker (otherwise: callee saved logs, non-volatile logs)
  • How the task of preparing the stack for and after receiving a call is separated by the merge function of the caller and the callee
  • What is the purpose of the calling convention?

    an assembly that manages interoperability functions on a different architecture and operating system. This includes the rules for placing the operation’s arguments, where they go, the numbers returned, which register functions can be used, how to assign local conditions to them, and so on.

    This has a lot to do with mapping sizes and formats to programming language types.Another closely related issue is alias manipulation, which specifies how names in code symbols are mapped to display names used by the linker. Calling conventions, type representations, and manipulation are phrases part of what is known as the location of the application’s binary files (ABIs).

    fastcall linux kernel

    There are subtle differences in how different compilers implement these conventions, but code compiled by many types of compilers is often difficult to pin. On the other hand, business meetings that are used as an API standard (for example, stdcall) are implemented quite uniformly.

    Background Time

    Today, the history before the advent of microcomputers, machine builders usually suppliedand operating system compilers and for various programming. Calling convention(s) for each specific platform. They were concretely defined by the programmer’s tools.

    Early microcomputers before the Pet Commodore Apple and II quite often did not have an operating system or compiler. The IBM PC belonged to Microsoft’s predecessor, the Disk Operating System (DOS), but did not have a compiler. Only the hardware standard for ibm-pc compatible machines was defined by Intel processors (8086 supplied by 80386), IBM. Hardware extensions as well as all software standards (except BIOS calling conventions) were released for full-blown competition.

    What are cdecl and Stdcall used for?

    __cdecl is the default assembly call for C++ and C programs. Given that the caller can easily clear the stack, it can get functions with a variable number of arguments. The __cdecl calling convention creates larger executables than __stdcall because it requires any stack cleanup code to be compatible with function calls.

    A large number of independent software vendors offered operating systems, compilers for many programming languages, and tools. Many calling patterns have been adopted by companies, often differing based on historical needs, creative strategies, and programmers.

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