fork.c File Reference

aarch64: fork()'s child thread, which returns to user mode as its parent does, from a copy of its parent's saved registers at the top of its own kernel stack. More...

#include <core/system.h>
#include <core/string.h>
#include <core/arch.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <aquila/errno.h>

Go to the source code of this file.

Functions
struct aarch64_thread *	aarch64_thread_new (void)
	Makes a thread's aarch64 state, with its kernel stack.
int	arch_proc_fork (struct thread *thread, struct proc *fork)
	Sets up the CPU state of a fork() child's thread: a copy of the parent's kernel stack, registers and FPU state, so that the child returns from fork() as its parent does.

Detailed Description

aarch64: fork()'s child thread, which returns to user mode as its parent does, from a copy of its parent's saved registers at the top of its own kernel stack.

Definition in file fork.c.

Function Documentation

aarch64_thread_new()

struct aarch64_thread * aarch64_thread_new

(

void

)

Makes a thread's aarch64 state, with its kernel stack.

Returns

the state, or NULL if there was no memory for it

Definition at line 30 of file thread.c.

References aarch64_thread_new(), KERN_STACK_SIZE, kfree(), kmalloc(), aarch64_thread::kstack, aarch64_thread::kstack_base, M_ZERO, and NULL.

Referenced by aarch64_thread_new(), arch_kthread_create(), arch_proc_fork(), arch_proc_init(), and arch_thread_create().

arch_proc_fork()

int arch_proc_fork	(	struct thread *	thread,
		struct proc *	fork )

Sets up the CPU state of a fork() child's thread: a copy of the parent's kernel stack, registers and FPU state, so that the child returns from fork() as its parent does.

Parameters

thread	the thread that called fork()
fork	the child process, whose one thread gets the state

Returns

0, or -ENOMEM if there was no memory for it

Definition at line 21 of file fork.c.

References aarch64_fpsimd_fork(), aarch64_thread_new(), thread::arch, arch_proc_fork(), aarch64_thread::ctx, aarch64_ctx::fp, queue::head, kfree(), aarch64_thread::kstack, aarch64_thread::kstack_base, aarch64_ctx::lr, aarch64_thread::regs, aarch64_ctx::sp, proc::threads, and qnode::value.

Referenced by arch_proc_fork(), and proc_fork().