Hardware Breakpoint implementation in BCC Manali Shukla Aanandita Dhawan Maneesh Soni October 28, 2020 Hardware breakpoint Memory in debuggers Elegant mechanism to monitor memory access Perf hardware breakpoint implementation: mem:[:access] [Hardware breakpoint] Example: perf stat -e mem:0xffffffffbb65f478:rw 01 https://www https://www.kernel.org/doc/ols/2009/ols2009-pages-149-158.pdf Implementation void bpf_attach_breakpoint(uint64_t symbol_addr, int pid, int progfd, int bp_type) { struct perf_event_attr attr = {}; memset(&attr

Being Friendly to Your Hardware Performance Engineering A gentle introduction to hardware for software engineers 2Where does C++ run? 3On an abstract C++ machine 4On an abstract C++ machine? specialty instructions, on-core and off- core accelerators • Data layout: both software and hardware characteristics 84 src dst • Alignment: source and destination • Size • Direction • LinearityExample

Before Installation : Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.1 Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.2 Software requirements something useful. 9 Chapter 2 Installing the compiler 2.1 Before Installation : Requirements 2.1.1 Hardware requirements The compiler needs at least one of the following processors: 1. An Intel 80386 or of watches in a separate window. Breakpoint (CTRL-F8) Sets a breakpoint at the current line. When debugging, program execution will stop at this breakpoint. Breakpoint list Shows the current list of breakpoints

. . . . . . . . . 1412 40 SunOS Specific Services 1413 40.1 sunaudiodev —Access to Sun audio hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1413 40.2 SUNAUDIODEV —Constants used with Reference, 发布 2.7.18 window.idcok(flag) If flag is False, curses no longer considers using the hardware insert/delete character feature of the terminal; if flag is True, use of character insertion and is enabled by default. window.idlok(yes) If called with yes equal to 1, curses will try and use hardware line editing facilities. Otherwise, line inser- tion/deletion are disabled. window.immedok(flag)

. . . . . . . . . 1412 40 SunOS Specific Services 1413 40.1 sunaudiodev —Access to Sun audio hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1413 40.2 SUNAUDIODEV —Constants used with Reference, 发布 2.7.18 window.idcok(flag) If flag is False, curses no longer considers using the hardware insert/delete character feature of the terminal; if flag is True, use of character insertion and is enabled by default. window.idlok(yes) If called with yes equal to 1, curses will try and use hardware line editing facilities. Otherwise, line inser- tion/deletion are disabled. window.immedok(flag)

. . . . . . . . . 1412 40 SunOS Specific Services 1413 40.1 sunaudiodev —Access to Sun audio hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1413 40.2 SUNAUDIODEV —Constants used with Reference, 发布 2.7.18 window.idcok(flag) If flag is False, curses no longer considers using the hardware insert/delete character feature of the terminal; if flag is True, use of character insertion and is enabled by default. window.idlok(yes) If called with yes equal to 1, curses will try and use hardware line editing facilities. Otherwise, line inser- tion/deletion are disabled. window.immedok(flag)

runtime, such as comptime_int and type , the result is 0 . See also: @sizeOf @typeInfo @breakpoint @breakpoint() void This function inserts a platform-specific debug trap instruction which causes debuggers @sqrt(value: anytype) @TypeOf(value) Performs the square root of a floating point number. Uses a dedicated hardware instruction when available. Supports Floats and Vectors of floats. @sin @sin(value: anytype) @TypeOf(value) Sine trigonometric function on a floating point number in radians. Uses a dedicated hardware instruction when available. Supports Floats and Vectors of floats. @cos @cos(value: anytype)

coroutines helps build server-side applications that scale to massive numbers of clients with modest hardware requirements. Interoperability: Kotlin is fully compatible with all Java-based frameworks, which and unreliable. Instead, we suggest a collection of alternative approaches, allowing you to use hardware concurrency and implement blocking IO. Those approaches are as follows, and they will be elaborated Current executable set to 'terminator.kexe' (x86_64). (lldb) b kfun:main(kotlin.Array) Breakpoint 1: where = terminator.kexe`kfun:main(kotlin.Array) + 4 at hello.kt:2, address =

Instruction Pointers for functions in modules view. Breakpoint Groups Visit https://aka.ms/BreakpointGroups for more details Dependent Breakpoint GroupsIn Visual Studio 2022 version 17.5, CMake Debugger Explorer for Linux Learn more at https://aka.ms/vslinuxEmbedded • On Chip Debugging with hardware breakpoint limits • Peripheral and RTOS object views • Serial monitor • Available in Visual Studio 2022

@alignCast @alignOf @ArgType @asyncCall @atomicLoad @atomicRmw @bitCast @bitOffsetOf @boolToInt @breakpoint @mulAdd @byteSwap @bitReverse @byteOffsetOf @bytesToSlice @cDefine @cImport @cInclude @clz @cmpxchgStrong If the value is known at compile-time, the return type is comptime_int instead of u1. @breakpoint @breakpoint() This function inserts a platform-specific debug trap instruction which causes debuggers @sqrt(comptime T: type, value: T) T Performs the square root of a floating point number. Uses a dedicated hardware instruction when available. Supports f16, f32, f64, and f128, as well as vectors. @sin @sin(comptime