How to run code from RAM on ARM architecture

by

On GCC: Just put the function in the .data section:

__attribute__( ( section(".data") ) )

It will be copied over with the rest of your initialzed variables by the startup code (no need to mess with the linker scipt). You may also need a “long_call” option as well if the function ends up “far away” from the rest of the code after being placed into RAM. 

__attribute__( ( long_call, section(".data") ) )

Example:

__attribute__( ( long_call, section(".data") ) ) void ram_foobar (void) { ... }

You may get an compiler warning that can be safely ignored:

Warning: ignoring changed section attributes for .data

More Related Contents:

  1. How is load->store reordering possible with in-order commit?
  2. What is the difference between FIQ and IRQ interrupt system?
  3. TrustZone monitor mode and IFAR, IFSR, DFAR, DFSR
  4. Arm Neon Intrinsics vs hand assembly
  5. Explaination of ARM (especifically mobile) Peripherals Addressing and Bus architecture?
  6. Explicitly accessing banked registers on ARM
  7. what is the right way to update MMU translation table
  8. SSE _mm_movemask_epi8 equivalent method for ARM NEON
  9. qemu-system-aarch64 entering el1 when emulating a53 power up
  10. Why unsigned types are more efficient in arm cpu?
  11. ARM: link register and frame pointer
  12. Are there any modern CPUs where a cached byte store is actually slower than a word store?
  13. Why does the ARM PC register point to the instruction after the next one to be executed?
  14. Set all bits in CPU register to 1 efficiently
  15. How does native android code written for ARM run on x86?
  16. Can _start be the thumb function?
  17. How instructions are differentiated from data?
  18. How can I select a static library to be linked while ARM cross compiling?
  19. Getting an label address to a register on ARM?
  20. duplicate symbols for architecture armv7
  21. Process for reducing the size of an executable
  22. When should we use prefetch?
  23. How clear and invalidate ARM v7 processor cache from User Mode on Linux 2.6.35
  24. Cross compiling static C hello world for Android using arm-linux-gnueabi-gcc
  25. How to work with external libraries when cross compiling?
  26. STM32 how to get last reset status
  27. Initial state of program registers and stack on Linux ARM
  28. How to specify an individual register as constraint in ARM GCC inline assembly?
  29. Cross Compile OpenSSH for ARM
  30. Converting Int to Float or Float to Int using Bitwise operations (software floating point)

Leave a Comment