syscall.c File Reference

aarch64: system calls. More...

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

Go to the source code of this file.

Functions
void	aarch64_preempt (void)
	Switches away from this CPU's running thread, which stays ready, to the next ready thread.
void	arch_syscall (struct aarch64_regs *r)
void	arch_syscall_return (struct thread *thread, uintptr_t val)
	Sets the result of a thread's system call, in the register that returns it to user mode.

Detailed Description

aarch64: system calls.

A program makes one with the svc #0 instruction, as on Linux: the number in x8, the arguments in x0 to x4, and the result comes back in x0. See docs/kernel/syscalls.md.

Definition in file syscall.c.

Function Documentation

aarch64_preempt()

void aarch64_preempt

(

void

)

Switches away from this CPU's running thread, which stays ready, to the next ready thread.

When the thread is chosen again, it goes on from here.

Definition at line 188 of file trap.c.

References aarch64_ctx_save(), aarch64_preempt(), aarch64_thread::ctx, curthread, and schedule().

Referenced by aarch64_irq(), aarch64_preempt(), arch_syscall(), and arch_yield().

arch_syscall()

void arch_syscall

(

struct aarch64_regs *

r

)

Definition at line 23 of file syscall.c.

References aarch64_preempt(), aarch64_return_to_user(), arch_syscall(), curthread, sched_urgent, syscall_dispatch(), and aarch64_regs::x.

Referenced by aarch64_goto(), arch_syscall(), arch_syscall(), isr_dispatch(), and sync_dispatch().

arch_syscall_return()

void arch_syscall_return	(	struct thread *	thread,
		uintptr_t	val )

Sets the result of a thread's system call, in the register that returns it to user mode.

That's in the thread's saved registers, or, for a thread that has never run (a child of fork()), where it will start from.

Parameters

thread	the thread
val	the result

Definition at line 43 of file syscall.c.

References thread::arch, arch_syscall_return(), aarch64_thread::regs, thread::spawned, aarch64_regs::x, and aarch64_thread::x0.

Referenced by arch_syscall_return(), proc_fork(), and syscall_dispatch().