arch/powerpc/kernel/syscalls.c

Source file repositories/reference/linux-study-clean/arch/powerpc/kernel/syscalls.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/kernel/syscalls.c
Extension
.c
Size
3358 bytes
Lines
128
Domain
Architecture Layer
Bucket
arch/powerpc
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(mmap2, unsigned long, addr, size_t, len,
		unsigned long, prot, unsigned long, flags,
		unsigned long, fd, unsigned long, pgoff)
{
	return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
}

#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE6(mmap2,
		       unsigned long, addr, size_t, len,
		       unsigned long, prot, unsigned long, flags,
		       unsigned long, fd, unsigned long, off_4k)
{
	return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12);
}
#endif

SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
		unsigned long, prot, unsigned long, flags,
		unsigned long, fd, off_t, offset)
{
	return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
}

#ifdef CONFIG_PPC64
static long do_ppc64_personality(unsigned long personality)
{
	long ret;

	if (personality(current->personality) == PER_LINUX32
	    && personality(personality) == PER_LINUX)
		personality = (personality & ~PER_MASK) | PER_LINUX32;
	ret = ksys_personality(personality);
	if (personality(ret) == PER_LINUX32)
		ret = (ret & ~PER_MASK) | PER_LINUX;
	return ret;
}

SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
{
	return do_ppc64_personality(personality);
}

#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
{
	return do_ppc64_personality(personality);
}
#endif /* CONFIG_COMPAT */
#endif /* CONFIG_PPC64 */

SYSCALL_DEFINE6(ppc_fadvise64_64,
		int, fd, int, advice, u32, offset_high, u32, offset_low,
		u32, len_high, u32, len_low)
{
	return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low),
				 merge_64(len_high, len_low), advice);
}

SYSCALL_DEFINE0(switch_endian)
{
	struct thread_info *ti;

	regs_set_return_msr(current->thread.regs,
				current->thread.regs->msr ^ MSR_LE);

	/*
	 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to
	 * userspace. That also has the effect of restoring the non-volatile
	 * GPRs, so we saved them on the way in here.
	 */
	ti = current_thread_info();
	ti->flags |= _TIF_RESTOREALL;

	return 0;
}

Annotation

Implementation Notes