I’m trying to find a way to do heap memory allocation in armv8-a assembly, and after looking through syscall tables and trying to look at the Linux Programmer’s Manual I can’t find any way to allocate and de-allocate memory at runtime without using malloc and free from the c standard library.
I’ve looked at
brk() but that doesn’t appear to have any way to de-allocate memory.
MAP_ANONYMOUS is preferred to
sbrk/brk for most purposes in modern programs. Use
munmap to free.
By the way,
brk can deallocate memory; simply pass an address lower than the current break point. But this does limit you to freeing in a last-in-first-out fashion.
Answered By – Nate Eldredge