Category : arm

__libc_init_array crashes when jumping to constructor ARM SAMD21G18

     arm, c++, g++, linker, samd21

I have a C++ toolchain for the ARM chip SAMD21g18 and I have just recently implemented the __libc_init_array function, so that global C++ objects have their constructors called before main(). I am using the code shown here: https://embeddedartistry.com/blog/2019/04/17/exploring-startup-implementations-newlib-arm/ /* Handle ELF .{pre_init,init,fini}_array sections. */ #include <sys/types.h> #ifdef HAVE_INITFINI_ARRAY /* These magic symbols are provided by ..

Read more

ARM GCC default linker script C++ initialization question

     arm, c++, gcc, linker-scripts

I was looking info default ARM GCC linker script and spotted interesting thing. Here is portion of code: .init_array : { PROVIDE_HIDDEN (__init_array_start = .); KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*))) KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors)) PROVIDE_HIDDEN (__init_array_end = .); } .fini_array : { PROVIDE_HIDDEN (__fini_array_start = .); KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*))) KEEP (*(.fini_array EXCLUDE_FILE ..

Read more

std::cout printing nan or zeros for float or double variables in armv7l

     arm, c++, cross-compiling, raspberry-pi

I’m writing a C++ program for a Raspberry PI 3B+ doing cross compilation using conan.io Docker container conanio/gcc7-armv7 for cross compilation. Everything was working fine until I started printing double values, and getting "nan" or wrong values in the output. I simplified my code to this minimal example that shows the problem: #include <cstdio> #include ..

Read more

Undefined Reference errors when cross compiling application for ARM

     arm, c++, cross-compiling, sdk, yocto

I’m trying to cross-compile for an ARM A9 on my host machine running Linux using Yocto SDK.The instructions for what I’m doing can be seen at this link. Yocto SDK Prior to building my application, I’m instructed to source the appropriate file which sets up the necessary paths and variables. . $SDKPATH/environment-setup-armv7ahf-vfp-neon-oe-linux-gnueabi Then, I issue ..

Read more

Errors Cross Compiling Application for ARM with Cmake

     arm, boost, c++, cmake, cross-compiling

I’m trying to cross-compile for an ARM A9 on my host machine running Linux. My CMakeLists.txt file is pretty simple. I’m not sure if there should be more here. cmake_minimum_required(VERSION 3.10) #set the project name project(Tutorial) #add the executable add_executable(replay_example rfnoc_replay_samples_1_from_file.cpp) Prior to building my application, I’m instructed to source the appropriate file. . $SDKPATH/environment-setup-armv7ahf-vfp-neon-oe-linux-gnueabi ..

Read more

can not find real function address on ARM64 v8

     arm, c++, embedded, gdb

my function name is overwriteFunc, and trying to print function address &overwriteFunc. I am trying to get function address on ARM64 v8,which returns me a address like this: Dump of assembler code for function [email protected]: 0x0000000000423a90 <+0>: adrp x16, 0x513000 0x0000000000423a94 <+4>: ldr x17, [x16,#1640] 0x0000000000423a98 <+8>: add x16, x16, #0x668 0x0000000000423a9c <+12>: br x17 ..

Read more

Running cross compiled valgrind on arm docker image

     arm, c++, cross-compiling, docker, valgrind

I have cross-compiled valgrind 3.13 using the arm-linaro toolchain with command: ./configure –target=arm-none-linux-gnueabi –host=armv7-none-linux-gnueabi –prefix=/home/karan/valgrind/build CFLAGS=-static CPPFLAGS=-fPIC CFLAGS=-fPIC make && make install I have transferred the valgrind build folder on the docker container( docker image: https://hub.docker.com/r/arm32v7/ubuntu in directory= /root/valgrind/build) and exported the PATH environment variable as well as VALGRIND_LIB variable. After this when I try ..

Read more