src/thread/__unmapself.c

570af302Sopenharmony_ci#include "pthread_impl.h"
570af302Sopenharmony_ci#include "atomic.h"
570af302Sopenharmony_ci#include "syscall.h"
570af302Sopenharmony_ci/* cheat and reuse CRTJMP macro from dynlink code */
570af302Sopenharmony_ci#include "dynlink.h"
570af302Sopenharmony_ci
570af302Sopenharmony_cistatic void *unmap_base;
570af302Sopenharmony_cistatic size_t unmap_size;
570af302Sopenharmony_cistatic char shared_stack[256];
570af302Sopenharmony_ci
570af302Sopenharmony_cistatic void do_unmap()
570af302Sopenharmony_ci{
570af302Sopenharmony_ci	__syscall(SYS_munmap, unmap_base, unmap_size);
570af302Sopenharmony_ci	__syscall(SYS_exit);
570af302Sopenharmony_ci}
570af302Sopenharmony_ci
570af302Sopenharmony_civoid __unmapself(void *base, size_t size)
570af302Sopenharmony_ci{
570af302Sopenharmony_ci	char *stack = shared_stack + sizeof shared_stack;
570af302Sopenharmony_ci	stack -= (uintptr_t)stack % 16;
570af302Sopenharmony_ci	unmap_base = base;
570af302Sopenharmony_ci	unmap_size = size;
570af302Sopenharmony_ci	CRTJMP(do_unmap, stack);
570af302Sopenharmony_ci}