arch/arm64/kernel/sys.c

Source file repositories/reference/linux-study-clean/arch/arm64/kernel/sys.c

File Facts

System
Linux kernel
Corpus path
arch/arm64/kernel/sys.c
Extension
.c
Size
1591 bytes
Lines
64
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: syscall or user/kernel boundary
Status
core implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
		unsigned long, prot, unsigned long, flags,
		unsigned long, fd, unsigned long, off)
{
	if (offset_in_page(off) != 0)
		return -EINVAL;

	return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
}

SYSCALL_DEFINE1(arm64_personality, unsigned int, personality)
{
	if (personality(personality) == PER_LINUX32 &&
		!system_supports_32bit_el0())
		return -EINVAL;
	return ksys_personality(personality);
}

asmlinkage long sys_ni_syscall(void);

asmlinkage long __arm64_sys_ni_syscall(const struct pt_regs *__unused)
{
	return sys_ni_syscall();
}

/*
 * Wrappers to pass the pt_regs argument.
 */
#define __arm64_sys_personality		__arm64_sys_arm64_personality

#define __SYSCALL_WITH_COMPAT(nr, native, compat)  __SYSCALL(nr, native)

#undef __SYSCALL
#define __SYSCALL(nr, sym)	asmlinkage long __arm64_##sym(const struct pt_regs *);
#include <asm/syscall_table_64.h>

#undef __SYSCALL
#define __SYSCALL(nr, sym)	[nr] = __arm64_##sym,

const syscall_fn_t sys_call_table[__NR_syscalls] = {
	[0 ... __NR_syscalls - 1] = __arm64_sys_ni_syscall,
#include <asm/syscall_table_64.h>
};

Annotation

Implementation Notes