Overview of Exception Masking In the x86 architecture, the Floating Point Unit (FPU) provides a set of exception handling mechanisms. By default, all floating-point exceptions are masked, which means that when an exception occurs, the processor provides a default result and continues execution without interrupting the program flow. FPU Control Word Structure The FPU control … Read more
Accelerated C++ const Modifies built-in type variables, custom objects, member functions, return values, and function parameters to ensure that a certain value remains unchanged. <span>const</span> modifies a variable, acting as a constant that can be assigned to a new variable, but the constant itself cannot change. const int a=7; int b = a; // valid … Read more
Exception Handling: Ensuring Robustness of Callback Functions and Thread Functions In the development of Python automation office scripts, multithreading and callback mechanisms are often used to handle concurrent tasks. However, a common misconception is that the try-except block in the main function can catch all exceptions. In reality, callback functions and thread functions run in … Read more
11. Tuples and Sets In addition to lists and dictionaries, these two data structures are also very common: 1. Tuples (Immutable Sequences) Defined using <span>()</span>, once the elements are set, they cannot be modified (immutable) Suitable for storing fixed data (such as coordinates, configuration items) # Define a tuple point = (10, 20) # Coordinates … Read more
Technical experience sharing, welcome to follow and provide guidance. Before performing the boot_card initialization, the BSP hook is set up in advance. This article analyzes the code of bsp_start_hook_1. A. AArch64 Start Set Vector Base This writes the vector table to the exception vector table VBAR_EL1, with the variable bsp_start_vector_table_begin defined as follows: bsp_start_vector_table_begin: .balign … Read more
C++ (C Plus Plus) is an object-oriented high-level programming language that extends and upgrades the C language. It was developed in 1979 by Bjarne Stroustrup at AT&T Bell Labs. Initially, C++ was referred to as “C With Classes”. It is a general-purpose programming language that supports static data type checking and multiple programming paradigms, including … Read more
I believe the references in this book are also worth considering, so I have listed them here for everyone’s reference.1. Design and Evolution of the C++ Language https://book.douban.com/subject/35198313/2. https://stackoverflow.com/questions/4993650/what-is-sizeofsomething-0 3. https://stackoverflow.com/questions/47352663/how-can-this-structure-have-sizeof-0/47352751#473527514. https://stackoverflow.com/questions/36577094/array-of-size-0-at-the-end-of-struct5. https://stackoverflow.com/questions/4178175/what-are-aggregates-and-trivial-types-pods-and-how-why-are-they-special/7189821#71898216. https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero-Length7. https://en.cppreference.com/w/cpp/types/is_standard_layout.html8. https://en.cppreference.com/w/cpp/types/is_trivially_copyable.html9. https://learn.microsoft.com/en-us/cpp/cpp/trivial-standard-layout-and-pod-types?view=msvc-17010. In-Depth Exploration of the C++ Object Model11. https://en.cppreference.com/w/cpp/language/unqualified_lookup.html12. https://en.cppreference.com/w/cpp/language/injected-class-name.html13. https://www.justsoftwaresolutions.co.uk/cplusplus/hidden-friends.html14. https://preshing.com/20210315/how-cpp-resolves-a-function-call/15. https://gcc.gnu.org/legacy-ml/gcc-patches/2000-01/msg00574.html16. https://en.cppreference.com/w/cpp/language/copy_elision.html17. https://devblogs.microsoft.com/cppblog/guaranteed-copy-elision-does-not-elide-copies/18. https://www.artima.com/articles/pure-virtual-function-called-an-explanation19 C++ Template Guide … Read more
The program compiled successfully, but crashes at runtime? Exceptions are thrown but the source cannot be found? Learn these runtime error localization techniques to transform your C++ program from “mysterious crashes” to “precise debugging”! 📖 Introduction 🎯 Why Master Runtime Error Localization? Compiling successfully does not equal a correct program! Runtime errors are one of … Read more
1. Automatic Hardware Behavior Triggered by Interrupts in ARMv8-A AArch64 1. Save PSTATE to SPSR_ELx; 2. Save return address to ELR_ELx; 3. Set PSTATE.{D,A,I,F} to 14; if it is a synchronous exception or SError, update the ESR_ELx exception characteristics register; 5. Jump to the exception vector table; 6. Select the target exception level's sp_elx
In the past, when writing C code, error handling often involved a series of if-else statements that returned error codes. For more complex business logic, these error codes would be nested, making tracking them quite cumbersome. If you find returning error codes through if-else statements troublesome, you could simply trigger an assertion with assert() and … Read more